1ca632f55SGrant Likely /* 2ca632f55SGrant Likely * A driver for the ARM PL022 PrimeCell SSP/SPI bus master. 3ca632f55SGrant Likely * 4aeef9915SLinus Walleij * Copyright (C) 2008-2012 ST-Ericsson AB 5ca632f55SGrant Likely * Copyright (C) 2006 STMicroelectronics Pvt. Ltd. 6ca632f55SGrant Likely * 7ca632f55SGrant Likely * Author: Linus Walleij <linus.walleij@stericsson.com> 8ca632f55SGrant Likely * 9ca632f55SGrant Likely * Initial version inspired by: 10ca632f55SGrant Likely * linux-2.6.17-rc3-mm1/drivers/spi/pxa2xx_spi.c 11ca632f55SGrant Likely * Initial adoption to PL022 by: 12ca632f55SGrant Likely * Sachin Verma <sachin.verma@st.com> 13ca632f55SGrant Likely * 14ca632f55SGrant Likely * This program is free software; you can redistribute it and/or modify 15ca632f55SGrant Likely * it under the terms of the GNU General Public License as published by 16ca632f55SGrant Likely * the Free Software Foundation; either version 2 of the License, or 17ca632f55SGrant Likely * (at your option) any later version. 18ca632f55SGrant Likely * 19ca632f55SGrant Likely * This program is distributed in the hope that it will be useful, 20ca632f55SGrant Likely * but WITHOUT ANY WARRANTY; without even the implied warranty of 21ca632f55SGrant Likely * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22ca632f55SGrant Likely * GNU General Public License for more details. 23ca632f55SGrant Likely */ 24ca632f55SGrant Likely 25ca632f55SGrant Likely #include <linux/init.h> 26ca632f55SGrant Likely #include <linux/module.h> 27ca632f55SGrant Likely #include <linux/device.h> 28ca632f55SGrant Likely #include <linux/ioport.h> 29ca632f55SGrant Likely #include <linux/errno.h> 30ca632f55SGrant Likely #include <linux/interrupt.h> 31ca632f55SGrant Likely #include <linux/spi/spi.h> 32ca632f55SGrant Likely #include <linux/delay.h> 33ca632f55SGrant Likely #include <linux/clk.h> 34ca632f55SGrant Likely #include <linux/err.h> 35ca632f55SGrant Likely #include <linux/amba/bus.h> 36ca632f55SGrant Likely #include <linux/amba/pl022.h> 37ca632f55SGrant Likely #include <linux/io.h> 38ca632f55SGrant Likely #include <linux/slab.h> 39ca632f55SGrant Likely #include <linux/dmaengine.h> 40ca632f55SGrant Likely #include <linux/dma-mapping.h> 41ca632f55SGrant Likely #include <linux/scatterlist.h> 42bcda6ff8SRabin Vincent #include <linux/pm_runtime.h> 43f6f46de1SRoland Stigge #include <linux/gpio.h> 446d3952a7SRoland Stigge #include <linux/of_gpio.h> 454f5e1b37SPatrice Chotard #include <linux/pinctrl/consumer.h> 46ca632f55SGrant Likely 47ca632f55SGrant Likely /* 48ca632f55SGrant Likely * This macro is used to define some register default values. 49ca632f55SGrant Likely * reg is masked with mask, the OR:ed with an (again masked) 50ca632f55SGrant Likely * val shifted sb steps to the left. 51ca632f55SGrant Likely */ 52ca632f55SGrant Likely #define SSP_WRITE_BITS(reg, val, mask, sb) \ 53ca632f55SGrant Likely ((reg) = (((reg) & ~(mask)) | (((val)<<(sb)) & (mask)))) 54ca632f55SGrant Likely 55ca632f55SGrant Likely /* 56ca632f55SGrant Likely * This macro is also used to define some default values. 57ca632f55SGrant Likely * It will just shift val by sb steps to the left and mask 58ca632f55SGrant Likely * the result with mask. 59ca632f55SGrant Likely */ 60ca632f55SGrant Likely #define GEN_MASK_BITS(val, mask, sb) \ 61ca632f55SGrant Likely (((val)<<(sb)) & (mask)) 62ca632f55SGrant Likely 63ca632f55SGrant Likely #define DRIVE_TX 0 64ca632f55SGrant Likely #define DO_NOT_DRIVE_TX 1 65ca632f55SGrant Likely 66ca632f55SGrant Likely #define DO_NOT_QUEUE_DMA 0 67ca632f55SGrant Likely #define QUEUE_DMA 1 68ca632f55SGrant Likely 69ca632f55SGrant Likely #define RX_TRANSFER 1 70ca632f55SGrant Likely #define TX_TRANSFER 2 71ca632f55SGrant Likely 72ca632f55SGrant Likely /* 73ca632f55SGrant Likely * Macros to access SSP Registers with their offsets 74ca632f55SGrant Likely */ 75ca632f55SGrant Likely #define SSP_CR0(r) (r + 0x000) 76ca632f55SGrant Likely #define SSP_CR1(r) (r + 0x004) 77ca632f55SGrant Likely #define SSP_DR(r) (r + 0x008) 78ca632f55SGrant Likely #define SSP_SR(r) (r + 0x00C) 79ca632f55SGrant Likely #define SSP_CPSR(r) (r + 0x010) 80ca632f55SGrant Likely #define SSP_IMSC(r) (r + 0x014) 81ca632f55SGrant Likely #define SSP_RIS(r) (r + 0x018) 82ca632f55SGrant Likely #define SSP_MIS(r) (r + 0x01C) 83ca632f55SGrant Likely #define SSP_ICR(r) (r + 0x020) 84ca632f55SGrant Likely #define SSP_DMACR(r) (r + 0x024) 85ca632f55SGrant Likely #define SSP_ITCR(r) (r + 0x080) 86ca632f55SGrant Likely #define SSP_ITIP(r) (r + 0x084) 87ca632f55SGrant Likely #define SSP_ITOP(r) (r + 0x088) 88ca632f55SGrant Likely #define SSP_TDR(r) (r + 0x08C) 89ca632f55SGrant Likely 90ca632f55SGrant Likely #define SSP_PID0(r) (r + 0xFE0) 91ca632f55SGrant Likely #define SSP_PID1(r) (r + 0xFE4) 92ca632f55SGrant Likely #define SSP_PID2(r) (r + 0xFE8) 93ca632f55SGrant Likely #define SSP_PID3(r) (r + 0xFEC) 94ca632f55SGrant Likely 95ca632f55SGrant Likely #define SSP_CID0(r) (r + 0xFF0) 96ca632f55SGrant Likely #define SSP_CID1(r) (r + 0xFF4) 97ca632f55SGrant Likely #define SSP_CID2(r) (r + 0xFF8) 98ca632f55SGrant Likely #define SSP_CID3(r) (r + 0xFFC) 99ca632f55SGrant Likely 100ca632f55SGrant Likely /* 101ca632f55SGrant Likely * SSP Control Register 0 - SSP_CR0 102ca632f55SGrant Likely */ 103ca632f55SGrant Likely #define SSP_CR0_MASK_DSS (0x0FUL << 0) 104ca632f55SGrant Likely #define SSP_CR0_MASK_FRF (0x3UL << 4) 105ca632f55SGrant Likely #define SSP_CR0_MASK_SPO (0x1UL << 6) 106ca632f55SGrant Likely #define SSP_CR0_MASK_SPH (0x1UL << 7) 107ca632f55SGrant Likely #define SSP_CR0_MASK_SCR (0xFFUL << 8) 108ca632f55SGrant Likely 109ca632f55SGrant Likely /* 110ca632f55SGrant Likely * The ST version of this block moves som bits 111ca632f55SGrant Likely * in SSP_CR0 and extends it to 32 bits 112ca632f55SGrant Likely */ 113ca632f55SGrant Likely #define SSP_CR0_MASK_DSS_ST (0x1FUL << 0) 114ca632f55SGrant Likely #define SSP_CR0_MASK_HALFDUP_ST (0x1UL << 5) 115ca632f55SGrant Likely #define SSP_CR0_MASK_CSS_ST (0x1FUL << 16) 116ca632f55SGrant Likely #define SSP_CR0_MASK_FRF_ST (0x3UL << 21) 117ca632f55SGrant Likely 118ca632f55SGrant Likely /* 119ca632f55SGrant Likely * SSP Control Register 0 - SSP_CR1 120ca632f55SGrant Likely */ 121ca632f55SGrant Likely #define SSP_CR1_MASK_LBM (0x1UL << 0) 122ca632f55SGrant Likely #define SSP_CR1_MASK_SSE (0x1UL << 1) 123ca632f55SGrant Likely #define SSP_CR1_MASK_MS (0x1UL << 2) 124ca632f55SGrant Likely #define SSP_CR1_MASK_SOD (0x1UL << 3) 125ca632f55SGrant Likely 126ca632f55SGrant Likely /* 127ca632f55SGrant Likely * The ST version of this block adds some bits 128ca632f55SGrant Likely * in SSP_CR1 129ca632f55SGrant Likely */ 130ca632f55SGrant Likely #define SSP_CR1_MASK_RENDN_ST (0x1UL << 4) 131ca632f55SGrant Likely #define SSP_CR1_MASK_TENDN_ST (0x1UL << 5) 132ca632f55SGrant Likely #define SSP_CR1_MASK_MWAIT_ST (0x1UL << 6) 133ca632f55SGrant Likely #define SSP_CR1_MASK_RXIFLSEL_ST (0x7UL << 7) 134ca632f55SGrant Likely #define SSP_CR1_MASK_TXIFLSEL_ST (0x7UL << 10) 135ca632f55SGrant Likely /* This one is only in the PL023 variant */ 136ca632f55SGrant Likely #define SSP_CR1_MASK_FBCLKDEL_ST (0x7UL << 13) 137ca632f55SGrant Likely 138ca632f55SGrant Likely /* 139ca632f55SGrant Likely * SSP Status Register - SSP_SR 140ca632f55SGrant Likely */ 141ca632f55SGrant Likely #define SSP_SR_MASK_TFE (0x1UL << 0) /* Transmit FIFO empty */ 142ca632f55SGrant Likely #define SSP_SR_MASK_TNF (0x1UL << 1) /* Transmit FIFO not full */ 143ca632f55SGrant Likely #define SSP_SR_MASK_RNE (0x1UL << 2) /* Receive FIFO not empty */ 144ca632f55SGrant Likely #define SSP_SR_MASK_RFF (0x1UL << 3) /* Receive FIFO full */ 145ca632f55SGrant Likely #define SSP_SR_MASK_BSY (0x1UL << 4) /* Busy Flag */ 146ca632f55SGrant Likely 147ca632f55SGrant Likely /* 148ca632f55SGrant Likely * SSP Clock Prescale Register - SSP_CPSR 149ca632f55SGrant Likely */ 150ca632f55SGrant Likely #define SSP_CPSR_MASK_CPSDVSR (0xFFUL << 0) 151ca632f55SGrant Likely 152ca632f55SGrant Likely /* 153ca632f55SGrant Likely * SSP Interrupt Mask Set/Clear Register - SSP_IMSC 154ca632f55SGrant Likely */ 155ca632f55SGrant Likely #define SSP_IMSC_MASK_RORIM (0x1UL << 0) /* Receive Overrun Interrupt mask */ 156ca632f55SGrant Likely #define SSP_IMSC_MASK_RTIM (0x1UL << 1) /* Receive timeout Interrupt mask */ 157ca632f55SGrant Likely #define SSP_IMSC_MASK_RXIM (0x1UL << 2) /* Receive FIFO Interrupt mask */ 158ca632f55SGrant Likely #define SSP_IMSC_MASK_TXIM (0x1UL << 3) /* Transmit FIFO Interrupt mask */ 159ca632f55SGrant Likely 160ca632f55SGrant Likely /* 161ca632f55SGrant Likely * SSP Raw Interrupt Status Register - SSP_RIS 162ca632f55SGrant Likely */ 163ca632f55SGrant Likely /* Receive Overrun Raw Interrupt status */ 164ca632f55SGrant Likely #define SSP_RIS_MASK_RORRIS (0x1UL << 0) 165ca632f55SGrant Likely /* Receive Timeout Raw Interrupt status */ 166ca632f55SGrant Likely #define SSP_RIS_MASK_RTRIS (0x1UL << 1) 167ca632f55SGrant Likely /* Receive FIFO Raw Interrupt status */ 168ca632f55SGrant Likely #define SSP_RIS_MASK_RXRIS (0x1UL << 2) 169ca632f55SGrant Likely /* Transmit FIFO Raw Interrupt status */ 170ca632f55SGrant Likely #define SSP_RIS_MASK_TXRIS (0x1UL << 3) 171ca632f55SGrant Likely 172ca632f55SGrant Likely /* 173ca632f55SGrant Likely * SSP Masked Interrupt Status Register - SSP_MIS 174ca632f55SGrant Likely */ 175ca632f55SGrant Likely /* Receive Overrun Masked Interrupt status */ 176ca632f55SGrant Likely #define SSP_MIS_MASK_RORMIS (0x1UL << 0) 177ca632f55SGrant Likely /* Receive Timeout Masked Interrupt status */ 178ca632f55SGrant Likely #define SSP_MIS_MASK_RTMIS (0x1UL << 1) 179ca632f55SGrant Likely /* Receive FIFO Masked Interrupt status */ 180ca632f55SGrant Likely #define SSP_MIS_MASK_RXMIS (0x1UL << 2) 181ca632f55SGrant Likely /* Transmit FIFO Masked Interrupt status */ 182ca632f55SGrant Likely #define SSP_MIS_MASK_TXMIS (0x1UL << 3) 183ca632f55SGrant Likely 184ca632f55SGrant Likely /* 185ca632f55SGrant Likely * SSP Interrupt Clear Register - SSP_ICR 186ca632f55SGrant Likely */ 187ca632f55SGrant Likely /* Receive Overrun Raw Clear Interrupt bit */ 188ca632f55SGrant Likely #define SSP_ICR_MASK_RORIC (0x1UL << 0) 189ca632f55SGrant Likely /* Receive Timeout Clear Interrupt bit */ 190ca632f55SGrant Likely #define SSP_ICR_MASK_RTIC (0x1UL << 1) 191ca632f55SGrant Likely 192ca632f55SGrant Likely /* 193ca632f55SGrant Likely * SSP DMA Control Register - SSP_DMACR 194ca632f55SGrant Likely */ 195ca632f55SGrant Likely /* Receive DMA Enable bit */ 196ca632f55SGrant Likely #define SSP_DMACR_MASK_RXDMAE (0x1UL << 0) 197ca632f55SGrant Likely /* Transmit DMA Enable bit */ 198ca632f55SGrant Likely #define SSP_DMACR_MASK_TXDMAE (0x1UL << 1) 199ca632f55SGrant Likely 200ca632f55SGrant Likely /* 201ca632f55SGrant Likely * SSP Integration Test control Register - SSP_ITCR 202ca632f55SGrant Likely */ 203ca632f55SGrant Likely #define SSP_ITCR_MASK_ITEN (0x1UL << 0) 204ca632f55SGrant Likely #define SSP_ITCR_MASK_TESTFIFO (0x1UL << 1) 205ca632f55SGrant Likely 206ca632f55SGrant Likely /* 207ca632f55SGrant Likely * SSP Integration Test Input Register - SSP_ITIP 208ca632f55SGrant Likely */ 209ca632f55SGrant Likely #define ITIP_MASK_SSPRXD (0x1UL << 0) 210ca632f55SGrant Likely #define ITIP_MASK_SSPFSSIN (0x1UL << 1) 211ca632f55SGrant Likely #define ITIP_MASK_SSPCLKIN (0x1UL << 2) 212ca632f55SGrant Likely #define ITIP_MASK_RXDMAC (0x1UL << 3) 213ca632f55SGrant Likely #define ITIP_MASK_TXDMAC (0x1UL << 4) 214ca632f55SGrant Likely #define ITIP_MASK_SSPTXDIN (0x1UL << 5) 215ca632f55SGrant Likely 216ca632f55SGrant Likely /* 217ca632f55SGrant Likely * SSP Integration Test output Register - SSP_ITOP 218ca632f55SGrant Likely */ 219ca632f55SGrant Likely #define ITOP_MASK_SSPTXD (0x1UL << 0) 220ca632f55SGrant Likely #define ITOP_MASK_SSPFSSOUT (0x1UL << 1) 221ca632f55SGrant Likely #define ITOP_MASK_SSPCLKOUT (0x1UL << 2) 222ca632f55SGrant Likely #define ITOP_MASK_SSPOEn (0x1UL << 3) 223ca632f55SGrant Likely #define ITOP_MASK_SSPCTLOEn (0x1UL << 4) 224ca632f55SGrant Likely #define ITOP_MASK_RORINTR (0x1UL << 5) 225ca632f55SGrant Likely #define ITOP_MASK_RTINTR (0x1UL << 6) 226ca632f55SGrant Likely #define ITOP_MASK_RXINTR (0x1UL << 7) 227ca632f55SGrant Likely #define ITOP_MASK_TXINTR (0x1UL << 8) 228ca632f55SGrant Likely #define ITOP_MASK_INTR (0x1UL << 9) 229ca632f55SGrant Likely #define ITOP_MASK_RXDMABREQ (0x1UL << 10) 230ca632f55SGrant Likely #define ITOP_MASK_RXDMASREQ (0x1UL << 11) 231ca632f55SGrant Likely #define ITOP_MASK_TXDMABREQ (0x1UL << 12) 232ca632f55SGrant Likely #define ITOP_MASK_TXDMASREQ (0x1UL << 13) 233ca632f55SGrant Likely 234ca632f55SGrant Likely /* 235ca632f55SGrant Likely * SSP Test Data Register - SSP_TDR 236ca632f55SGrant Likely */ 237ca632f55SGrant Likely #define TDR_MASK_TESTDATA (0xFFFFFFFF) 238ca632f55SGrant Likely 239ca632f55SGrant Likely /* 240ca632f55SGrant Likely * Message State 241ca632f55SGrant Likely * we use the spi_message.state (void *) pointer to 242ca632f55SGrant Likely * hold a single state value, that's why all this 243ca632f55SGrant Likely * (void *) casting is done here. 244ca632f55SGrant Likely */ 245ca632f55SGrant Likely #define STATE_START ((void *) 0) 246ca632f55SGrant Likely #define STATE_RUNNING ((void *) 1) 247ca632f55SGrant Likely #define STATE_DONE ((void *) 2) 248ca632f55SGrant Likely #define STATE_ERROR ((void *) -1) 249ca632f55SGrant Likely 250ca632f55SGrant Likely /* 251ca632f55SGrant Likely * SSP State - Whether Enabled or Disabled 252ca632f55SGrant Likely */ 253ca632f55SGrant Likely #define SSP_DISABLED (0) 254ca632f55SGrant Likely #define SSP_ENABLED (1) 255ca632f55SGrant Likely 256ca632f55SGrant Likely /* 257ca632f55SGrant Likely * SSP DMA State - Whether DMA Enabled or Disabled 258ca632f55SGrant Likely */ 259ca632f55SGrant Likely #define SSP_DMA_DISABLED (0) 260ca632f55SGrant Likely #define SSP_DMA_ENABLED (1) 261ca632f55SGrant Likely 262ca632f55SGrant Likely /* 263ca632f55SGrant Likely * SSP Clock Defaults 264ca632f55SGrant Likely */ 265ca632f55SGrant Likely #define SSP_DEFAULT_CLKRATE 0x2 266ca632f55SGrant Likely #define SSP_DEFAULT_PRESCALE 0x40 267ca632f55SGrant Likely 268ca632f55SGrant Likely /* 269ca632f55SGrant Likely * SSP Clock Parameter ranges 270ca632f55SGrant Likely */ 271ca632f55SGrant Likely #define CPSDVR_MIN 0x02 272ca632f55SGrant Likely #define CPSDVR_MAX 0xFE 273ca632f55SGrant Likely #define SCR_MIN 0x00 274ca632f55SGrant Likely #define SCR_MAX 0xFF 275ca632f55SGrant Likely 276ca632f55SGrant Likely /* 277ca632f55SGrant Likely * SSP Interrupt related Macros 278ca632f55SGrant Likely */ 279ca632f55SGrant Likely #define DEFAULT_SSP_REG_IMSC 0x0UL 280ca632f55SGrant Likely #define DISABLE_ALL_INTERRUPTS DEFAULT_SSP_REG_IMSC 281ca632f55SGrant Likely #define ENABLE_ALL_INTERRUPTS (~DEFAULT_SSP_REG_IMSC) 282ca632f55SGrant Likely 283ca632f55SGrant Likely #define CLEAR_ALL_INTERRUPTS 0x3 284ca632f55SGrant Likely 285ca632f55SGrant Likely #define SPI_POLLING_TIMEOUT 1000 286ca632f55SGrant Likely 287ca632f55SGrant Likely /* 288ca632f55SGrant Likely * The type of reading going on on this chip 289ca632f55SGrant Likely */ 290ca632f55SGrant Likely enum ssp_reading { 291ca632f55SGrant Likely READING_NULL, 292ca632f55SGrant Likely READING_U8, 293ca632f55SGrant Likely READING_U16, 294ca632f55SGrant Likely READING_U32 295ca632f55SGrant Likely }; 296ca632f55SGrant Likely 297ca632f55SGrant Likely /** 298ca632f55SGrant Likely * The type of writing going on on this chip 299ca632f55SGrant Likely */ 300ca632f55SGrant Likely enum ssp_writing { 301ca632f55SGrant Likely WRITING_NULL, 302ca632f55SGrant Likely WRITING_U8, 303ca632f55SGrant Likely WRITING_U16, 304ca632f55SGrant Likely WRITING_U32 305ca632f55SGrant Likely }; 306ca632f55SGrant Likely 307ca632f55SGrant Likely /** 308ca632f55SGrant Likely * struct vendor_data - vendor-specific config parameters 309ca632f55SGrant Likely * for PL022 derivates 310ca632f55SGrant Likely * @fifodepth: depth of FIFOs (both) 311ca632f55SGrant Likely * @max_bpw: maximum number of bits per word 312ca632f55SGrant Likely * @unidir: supports unidirection transfers 313ca632f55SGrant Likely * @extended_cr: 32 bit wide control register 0 with extra 314ca632f55SGrant Likely * features and extra features in CR1 as found in the ST variants 315ca632f55SGrant Likely * @pl023: supports a subset of the ST extensions called "PL023" 316ca632f55SGrant Likely */ 317ca632f55SGrant Likely struct vendor_data { 318ca632f55SGrant Likely int fifodepth; 319ca632f55SGrant Likely int max_bpw; 320ca632f55SGrant Likely bool unidir; 321ca632f55SGrant Likely bool extended_cr; 322ca632f55SGrant Likely bool pl023; 323ca632f55SGrant Likely bool loopback; 324ca632f55SGrant Likely }; 325ca632f55SGrant Likely 326ca632f55SGrant Likely /** 327ca632f55SGrant Likely * struct pl022 - This is the private SSP driver data structure 328ca632f55SGrant Likely * @adev: AMBA device model hookup 329ca632f55SGrant Likely * @vendor: vendor data for the IP block 330ca632f55SGrant Likely * @phybase: the physical memory where the SSP device resides 331ca632f55SGrant Likely * @virtbase: the virtual memory where the SSP is mapped 332ca632f55SGrant Likely * @clk: outgoing clock "SPICLK" for the SPI bus 333ca632f55SGrant Likely * @master: SPI framework hookup 334ca632f55SGrant Likely * @master_info: controller-specific data from machine setup 33514af60b6SChris Blair * @kworker: thread struct for message pump 33614af60b6SChris Blair * @kworker_task: pointer to task for message pump kworker thread 33714af60b6SChris Blair * @pump_messages: work struct for scheduling work to the message pump 338ca632f55SGrant Likely * @queue_lock: spinlock to syncronise access to message queue 339ca632f55SGrant Likely * @queue: message queue 34014af60b6SChris Blair * @busy: message pump is busy 34114af60b6SChris Blair * @running: message pump is running 342ca632f55SGrant Likely * @pump_transfers: Tasklet used in Interrupt Transfer mode 343ca632f55SGrant Likely * @cur_msg: Pointer to current spi_message being processed 344ca632f55SGrant Likely * @cur_transfer: Pointer to current spi_transfer 345ca632f55SGrant Likely * @cur_chip: pointer to current clients chip(assigned from controller_state) 3468b8d7191SVirupax Sadashivpetimath * @next_msg_cs_active: the next message in the queue has been examined 3478b8d7191SVirupax Sadashivpetimath * and it was found that it uses the same chip select as the previous 3488b8d7191SVirupax Sadashivpetimath * message, so we left it active after the previous transfer, and it's 3498b8d7191SVirupax Sadashivpetimath * active already. 350ca632f55SGrant Likely * @tx: current position in TX buffer to be read 351ca632f55SGrant Likely * @tx_end: end position in TX buffer to be read 352ca632f55SGrant Likely * @rx: current position in RX buffer to be written 353ca632f55SGrant Likely * @rx_end: end position in RX buffer to be written 354ca632f55SGrant Likely * @read: the type of read currently going on 355ca632f55SGrant Likely * @write: the type of write currently going on 356ca632f55SGrant Likely * @exp_fifo_level: expected FIFO level 357ca632f55SGrant Likely * @dma_rx_channel: optional channel for RX DMA 358ca632f55SGrant Likely * @dma_tx_channel: optional channel for TX DMA 359ca632f55SGrant Likely * @sgt_rx: scattertable for the RX transfer 360ca632f55SGrant Likely * @sgt_tx: scattertable for the TX transfer 361ca632f55SGrant Likely * @dummypage: a dummy page used for driving data on the bus with DMA 362f6f46de1SRoland Stigge * @cur_cs: current chip select (gpio) 363f6f46de1SRoland Stigge * @chipselects: list of chipselects (gpios) 364ca632f55SGrant Likely */ 365ca632f55SGrant Likely struct pl022 { 366ca632f55SGrant Likely struct amba_device *adev; 367ca632f55SGrant Likely struct vendor_data *vendor; 368ca632f55SGrant Likely resource_size_t phybase; 369ca632f55SGrant Likely void __iomem *virtbase; 370ca632f55SGrant Likely struct clk *clk; 371ca632f55SGrant Likely struct spi_master *master; 372ca632f55SGrant Likely struct pl022_ssp_controller *master_info; 373ffbbdd21SLinus Walleij /* Message per-transfer pump */ 374ca632f55SGrant Likely struct tasklet_struct pump_transfers; 375ca632f55SGrant Likely struct spi_message *cur_msg; 376ca632f55SGrant Likely struct spi_transfer *cur_transfer; 377ca632f55SGrant Likely struct chip_data *cur_chip; 3788b8d7191SVirupax Sadashivpetimath bool next_msg_cs_active; 379ca632f55SGrant Likely void *tx; 380ca632f55SGrant Likely void *tx_end; 381ca632f55SGrant Likely void *rx; 382ca632f55SGrant Likely void *rx_end; 383ca632f55SGrant Likely enum ssp_reading read; 384ca632f55SGrant Likely enum ssp_writing write; 385ca632f55SGrant Likely u32 exp_fifo_level; 386083be3f0SLinus Walleij enum ssp_rx_level_trig rx_lev_trig; 387083be3f0SLinus Walleij enum ssp_tx_level_trig tx_lev_trig; 388ca632f55SGrant Likely /* DMA settings */ 389ca632f55SGrant Likely #ifdef CONFIG_DMA_ENGINE 390ca632f55SGrant Likely struct dma_chan *dma_rx_channel; 391ca632f55SGrant Likely struct dma_chan *dma_tx_channel; 392ca632f55SGrant Likely struct sg_table sgt_rx; 393ca632f55SGrant Likely struct sg_table sgt_tx; 394ca632f55SGrant Likely char *dummypage; 395ffbbdd21SLinus Walleij bool dma_running; 396ca632f55SGrant Likely #endif 397f6f46de1SRoland Stigge int cur_cs; 398f6f46de1SRoland Stigge int *chipselects; 399ca632f55SGrant Likely }; 400ca632f55SGrant Likely 401ca632f55SGrant Likely /** 402ca632f55SGrant Likely * struct chip_data - To maintain runtime state of SSP for each client chip 403ca632f55SGrant Likely * @cr0: Value of control register CR0 of SSP - on later ST variants this 404ca632f55SGrant Likely * register is 32 bits wide rather than just 16 405ca632f55SGrant Likely * @cr1: Value of control register CR1 of SSP 406ca632f55SGrant Likely * @dmacr: Value of DMA control Register of SSP 407ca632f55SGrant Likely * @cpsr: Value of Clock prescale register 408ca632f55SGrant Likely * @n_bytes: how many bytes(power of 2) reqd for a given data width of client 409ca632f55SGrant Likely * @enable_dma: Whether to enable DMA or not 410ca632f55SGrant Likely * @read: function ptr to be used to read when doing xfer for this chip 411ca632f55SGrant Likely * @write: function ptr to be used to write when doing xfer for this chip 412ca632f55SGrant Likely * @cs_control: chip select callback provided by chip 413ca632f55SGrant Likely * @xfer_type: polling/interrupt/DMA 414ca632f55SGrant Likely * 415ca632f55SGrant Likely * Runtime state of the SSP controller, maintained per chip, 416ca632f55SGrant Likely * This would be set according to the current message that would be served 417ca632f55SGrant Likely */ 418ca632f55SGrant Likely struct chip_data { 419ca632f55SGrant Likely u32 cr0; 420ca632f55SGrant Likely u16 cr1; 421ca632f55SGrant Likely u16 dmacr; 422ca632f55SGrant Likely u16 cpsr; 423ca632f55SGrant Likely u8 n_bytes; 424ca632f55SGrant Likely bool enable_dma; 425ca632f55SGrant Likely enum ssp_reading read; 426ca632f55SGrant Likely enum ssp_writing write; 427ca632f55SGrant Likely void (*cs_control) (u32 command); 428ca632f55SGrant Likely int xfer_type; 429ca632f55SGrant Likely }; 430ca632f55SGrant Likely 431ca632f55SGrant Likely /** 432ca632f55SGrant Likely * null_cs_control - Dummy chip select function 433ca632f55SGrant Likely * @command: select/delect the chip 434ca632f55SGrant Likely * 435ca632f55SGrant Likely * If no chip select function is provided by client this is used as dummy 436ca632f55SGrant Likely * chip select 437ca632f55SGrant Likely */ 438ca632f55SGrant Likely static void null_cs_control(u32 command) 439ca632f55SGrant Likely { 440ca632f55SGrant Likely pr_debug("pl022: dummy chip select control, CS=0x%x\n", command); 441ca632f55SGrant Likely } 442ca632f55SGrant Likely 443f6f46de1SRoland Stigge static void pl022_cs_control(struct pl022 *pl022, u32 command) 444f6f46de1SRoland Stigge { 445f6f46de1SRoland Stigge if (gpio_is_valid(pl022->cur_cs)) 446f6f46de1SRoland Stigge gpio_set_value(pl022->cur_cs, command); 447f6f46de1SRoland Stigge else 448f6f46de1SRoland Stigge pl022->cur_chip->cs_control(command); 449f6f46de1SRoland Stigge } 450f6f46de1SRoland Stigge 451ca632f55SGrant Likely /** 452ca632f55SGrant Likely * giveback - current spi_message is over, schedule next message and call 453ca632f55SGrant Likely * callback of this message. Assumes that caller already 454ca632f55SGrant Likely * set message->status; dma and pio irqs are blocked 455ca632f55SGrant Likely * @pl022: SSP driver private data structure 456ca632f55SGrant Likely */ 457ca632f55SGrant Likely static void giveback(struct pl022 *pl022) 458ca632f55SGrant Likely { 459ca632f55SGrant Likely struct spi_transfer *last_transfer; 4608b8d7191SVirupax Sadashivpetimath pl022->next_msg_cs_active = false; 461ca632f55SGrant Likely 4628b8d7191SVirupax Sadashivpetimath last_transfer = list_entry(pl022->cur_msg->transfers.prev, 463ca632f55SGrant Likely struct spi_transfer, 464ca632f55SGrant Likely transfer_list); 465ca632f55SGrant Likely 466ca632f55SGrant Likely /* Delay if requested before any change in chip select */ 467ca632f55SGrant Likely if (last_transfer->delay_usecs) 468ca632f55SGrant Likely /* 469ca632f55SGrant Likely * FIXME: This runs in interrupt context. 470ca632f55SGrant Likely * Is this really smart? 471ca632f55SGrant Likely */ 472ca632f55SGrant Likely udelay(last_transfer->delay_usecs); 473ca632f55SGrant Likely 4748b8d7191SVirupax Sadashivpetimath if (!last_transfer->cs_change) { 475ca632f55SGrant Likely struct spi_message *next_msg; 476ca632f55SGrant Likely 4778b8d7191SVirupax Sadashivpetimath /* 4788b8d7191SVirupax Sadashivpetimath * cs_change was not set. We can keep the chip select 4798b8d7191SVirupax Sadashivpetimath * enabled if there is message in the queue and it is 4808b8d7191SVirupax Sadashivpetimath * for the same spi device. 481ca632f55SGrant Likely * 482ca632f55SGrant Likely * We cannot postpone this until pump_messages, because 483ca632f55SGrant Likely * after calling msg->complete (below) the driver that 484ca632f55SGrant Likely * sent the current message could be unloaded, which 485ca632f55SGrant Likely * could invalidate the cs_control() callback... 486ca632f55SGrant Likely */ 487ca632f55SGrant Likely /* get a pointer to the next message, if any */ 488ffbbdd21SLinus Walleij next_msg = spi_get_next_queued_message(pl022->master); 489ca632f55SGrant Likely 4908b8d7191SVirupax Sadashivpetimath /* 4918b8d7191SVirupax Sadashivpetimath * see if the next and current messages point 4928b8d7191SVirupax Sadashivpetimath * to the same spi device. 493ca632f55SGrant Likely */ 4948b8d7191SVirupax Sadashivpetimath if (next_msg && next_msg->spi != pl022->cur_msg->spi) 495ca632f55SGrant Likely next_msg = NULL; 4968b8d7191SVirupax Sadashivpetimath if (!next_msg || pl022->cur_msg->state == STATE_ERROR) 497f6f46de1SRoland Stigge pl022_cs_control(pl022, SSP_CHIP_DESELECT); 4988b8d7191SVirupax Sadashivpetimath else 4998b8d7191SVirupax Sadashivpetimath pl022->next_msg_cs_active = true; 500ffbbdd21SLinus Walleij 501ca632f55SGrant Likely } 5028b8d7191SVirupax Sadashivpetimath 5038b8d7191SVirupax Sadashivpetimath pl022->cur_msg = NULL; 5048b8d7191SVirupax Sadashivpetimath pl022->cur_transfer = NULL; 5058b8d7191SVirupax Sadashivpetimath pl022->cur_chip = NULL; 506ffbbdd21SLinus Walleij spi_finalize_current_message(pl022->master); 507fd316941SVirupax Sadashivpetimath 508fd316941SVirupax Sadashivpetimath /* disable the SPI/SSP operation */ 509fd316941SVirupax Sadashivpetimath writew((readw(SSP_CR1(pl022->virtbase)) & 510fd316941SVirupax Sadashivpetimath (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); 511fd316941SVirupax Sadashivpetimath 512ca632f55SGrant Likely } 513ca632f55SGrant Likely 514ca632f55SGrant Likely /** 515ca632f55SGrant Likely * flush - flush the FIFO to reach a clean state 516ca632f55SGrant Likely * @pl022: SSP driver private data structure 517ca632f55SGrant Likely */ 518ca632f55SGrant Likely static int flush(struct pl022 *pl022) 519ca632f55SGrant Likely { 520ca632f55SGrant Likely unsigned long limit = loops_per_jiffy << 1; 521ca632f55SGrant Likely 522ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, "flush\n"); 523ca632f55SGrant Likely do { 524ca632f55SGrant Likely while (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) 525ca632f55SGrant Likely readw(SSP_DR(pl022->virtbase)); 526ca632f55SGrant Likely } while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_BSY) && limit--); 527ca632f55SGrant Likely 528ca632f55SGrant Likely pl022->exp_fifo_level = 0; 529ca632f55SGrant Likely 530ca632f55SGrant Likely return limit; 531ca632f55SGrant Likely } 532ca632f55SGrant Likely 533ca632f55SGrant Likely /** 534ca632f55SGrant Likely * restore_state - Load configuration of current chip 535ca632f55SGrant Likely * @pl022: SSP driver private data structure 536ca632f55SGrant Likely */ 537ca632f55SGrant Likely static void restore_state(struct pl022 *pl022) 538ca632f55SGrant Likely { 539ca632f55SGrant Likely struct chip_data *chip = pl022->cur_chip; 540ca632f55SGrant Likely 541ca632f55SGrant Likely if (pl022->vendor->extended_cr) 542ca632f55SGrant Likely writel(chip->cr0, SSP_CR0(pl022->virtbase)); 543ca632f55SGrant Likely else 544ca632f55SGrant Likely writew(chip->cr0, SSP_CR0(pl022->virtbase)); 545ca632f55SGrant Likely writew(chip->cr1, SSP_CR1(pl022->virtbase)); 546ca632f55SGrant Likely writew(chip->dmacr, SSP_DMACR(pl022->virtbase)); 547ca632f55SGrant Likely writew(chip->cpsr, SSP_CPSR(pl022->virtbase)); 548ca632f55SGrant Likely writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase)); 549ca632f55SGrant Likely writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); 550ca632f55SGrant Likely } 551ca632f55SGrant Likely 552ca632f55SGrant Likely /* 553ca632f55SGrant Likely * Default SSP Register Values 554ca632f55SGrant Likely */ 555ca632f55SGrant Likely #define DEFAULT_SSP_REG_CR0 ( \ 556ca632f55SGrant Likely GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS, 0) | \ 557ca632f55SGrant Likely GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF, 4) | \ 558ca632f55SGrant Likely GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ 559ca632f55SGrant Likely GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ 560ca632f55SGrant Likely GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \ 561ca632f55SGrant Likely ) 562ca632f55SGrant Likely 563ca632f55SGrant Likely /* ST versions have slightly different bit layout */ 564ca632f55SGrant Likely #define DEFAULT_SSP_REG_CR0_ST ( \ 565ca632f55SGrant Likely GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \ 566ca632f55SGrant Likely GEN_MASK_BITS(SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, SSP_CR0_MASK_HALFDUP_ST, 5) | \ 567ca632f55SGrant Likely GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ 568ca632f55SGrant Likely GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ 569ca632f55SGrant Likely GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) | \ 570ca632f55SGrant Likely GEN_MASK_BITS(SSP_BITS_8, SSP_CR0_MASK_CSS_ST, 16) | \ 571ca632f55SGrant Likely GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF_ST, 21) \ 572ca632f55SGrant Likely ) 573ca632f55SGrant Likely 574ca632f55SGrant Likely /* The PL023 version is slightly different again */ 575ca632f55SGrant Likely #define DEFAULT_SSP_REG_CR0_ST_PL023 ( \ 576ca632f55SGrant Likely GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \ 577ca632f55SGrant Likely GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ 578ca632f55SGrant Likely GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ 579ca632f55SGrant Likely GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \ 580ca632f55SGrant Likely ) 581ca632f55SGrant Likely 582ca632f55SGrant Likely #define DEFAULT_SSP_REG_CR1 ( \ 583ca632f55SGrant Likely GEN_MASK_BITS(LOOPBACK_DISABLED, SSP_CR1_MASK_LBM, 0) | \ 584ca632f55SGrant Likely GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \ 585ca632f55SGrant Likely GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \ 586ca632f55SGrant Likely GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) \ 587ca632f55SGrant Likely ) 588ca632f55SGrant Likely 589ca632f55SGrant Likely /* ST versions extend this register to use all 16 bits */ 590ca632f55SGrant Likely #define DEFAULT_SSP_REG_CR1_ST ( \ 591ca632f55SGrant Likely DEFAULT_SSP_REG_CR1 | \ 592ca632f55SGrant Likely GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \ 593ca632f55SGrant Likely GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \ 594ca632f55SGrant Likely GEN_MASK_BITS(SSP_MWIRE_WAIT_ZERO, SSP_CR1_MASK_MWAIT_ST, 6) |\ 595ca632f55SGrant Likely GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \ 596ca632f55SGrant Likely GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) \ 597ca632f55SGrant Likely ) 598ca632f55SGrant Likely 599ca632f55SGrant Likely /* 600ca632f55SGrant Likely * The PL023 variant has further differences: no loopback mode, no microwire 601ca632f55SGrant Likely * support, and a new clock feedback delay setting. 602ca632f55SGrant Likely */ 603ca632f55SGrant Likely #define DEFAULT_SSP_REG_CR1_ST_PL023 ( \ 604ca632f55SGrant Likely GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \ 605ca632f55SGrant Likely GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \ 606ca632f55SGrant Likely GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) | \ 607ca632f55SGrant Likely GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \ 608ca632f55SGrant Likely GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \ 609ca632f55SGrant Likely GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \ 610ca632f55SGrant Likely GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) | \ 611ca632f55SGrant Likely GEN_MASK_BITS(SSP_FEEDBACK_CLK_DELAY_NONE, SSP_CR1_MASK_FBCLKDEL_ST, 13) \ 612ca632f55SGrant Likely ) 613ca632f55SGrant Likely 614ca632f55SGrant Likely #define DEFAULT_SSP_REG_CPSR ( \ 615ca632f55SGrant Likely GEN_MASK_BITS(SSP_DEFAULT_PRESCALE, SSP_CPSR_MASK_CPSDVSR, 0) \ 616ca632f55SGrant Likely ) 617ca632f55SGrant Likely 618ca632f55SGrant Likely #define DEFAULT_SSP_REG_DMACR (\ 619ca632f55SGrant Likely GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_RXDMAE, 0) | \ 620ca632f55SGrant Likely GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_TXDMAE, 1) \ 621ca632f55SGrant Likely ) 622ca632f55SGrant Likely 623ca632f55SGrant Likely /** 624ca632f55SGrant Likely * load_ssp_default_config - Load default configuration for SSP 625ca632f55SGrant Likely * @pl022: SSP driver private data structure 626ca632f55SGrant Likely */ 627ca632f55SGrant Likely static void load_ssp_default_config(struct pl022 *pl022) 628ca632f55SGrant Likely { 629ca632f55SGrant Likely if (pl022->vendor->pl023) { 630ca632f55SGrant Likely writel(DEFAULT_SSP_REG_CR0_ST_PL023, SSP_CR0(pl022->virtbase)); 631ca632f55SGrant Likely writew(DEFAULT_SSP_REG_CR1_ST_PL023, SSP_CR1(pl022->virtbase)); 632ca632f55SGrant Likely } else if (pl022->vendor->extended_cr) { 633ca632f55SGrant Likely writel(DEFAULT_SSP_REG_CR0_ST, SSP_CR0(pl022->virtbase)); 634ca632f55SGrant Likely writew(DEFAULT_SSP_REG_CR1_ST, SSP_CR1(pl022->virtbase)); 635ca632f55SGrant Likely } else { 636ca632f55SGrant Likely writew(DEFAULT_SSP_REG_CR0, SSP_CR0(pl022->virtbase)); 637ca632f55SGrant Likely writew(DEFAULT_SSP_REG_CR1, SSP_CR1(pl022->virtbase)); 638ca632f55SGrant Likely } 639ca632f55SGrant Likely writew(DEFAULT_SSP_REG_DMACR, SSP_DMACR(pl022->virtbase)); 640ca632f55SGrant Likely writew(DEFAULT_SSP_REG_CPSR, SSP_CPSR(pl022->virtbase)); 641ca632f55SGrant Likely writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase)); 642ca632f55SGrant Likely writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); 643ca632f55SGrant Likely } 644ca632f55SGrant Likely 645ca632f55SGrant Likely /** 646ca632f55SGrant Likely * This will write to TX and read from RX according to the parameters 647ca632f55SGrant Likely * set in pl022. 648ca632f55SGrant Likely */ 649ca632f55SGrant Likely static void readwriter(struct pl022 *pl022) 650ca632f55SGrant Likely { 651ca632f55SGrant Likely 652ca632f55SGrant Likely /* 653ca632f55SGrant Likely * The FIFO depth is different between primecell variants. 654ca632f55SGrant Likely * I believe filling in too much in the FIFO might cause 655ca632f55SGrant Likely * errons in 8bit wide transfers on ARM variants (just 8 words 656ca632f55SGrant Likely * FIFO, means only 8x8 = 64 bits in FIFO) at least. 657ca632f55SGrant Likely * 658ca632f55SGrant Likely * To prevent this issue, the TX FIFO is only filled to the 659ca632f55SGrant Likely * unused RX FIFO fill length, regardless of what the TX 660ca632f55SGrant Likely * FIFO status flag indicates. 661ca632f55SGrant Likely */ 662ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, 663ca632f55SGrant Likely "%s, rx: %p, rxend: %p, tx: %p, txend: %p\n", 664ca632f55SGrant Likely __func__, pl022->rx, pl022->rx_end, pl022->tx, pl022->tx_end); 665ca632f55SGrant Likely 666ca632f55SGrant Likely /* Read as much as you can */ 667ca632f55SGrant Likely while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) 668ca632f55SGrant Likely && (pl022->rx < pl022->rx_end)) { 669ca632f55SGrant Likely switch (pl022->read) { 670ca632f55SGrant Likely case READING_NULL: 671ca632f55SGrant Likely readw(SSP_DR(pl022->virtbase)); 672ca632f55SGrant Likely break; 673ca632f55SGrant Likely case READING_U8: 674ca632f55SGrant Likely *(u8 *) (pl022->rx) = 675ca632f55SGrant Likely readw(SSP_DR(pl022->virtbase)) & 0xFFU; 676ca632f55SGrant Likely break; 677ca632f55SGrant Likely case READING_U16: 678ca632f55SGrant Likely *(u16 *) (pl022->rx) = 679ca632f55SGrant Likely (u16) readw(SSP_DR(pl022->virtbase)); 680ca632f55SGrant Likely break; 681ca632f55SGrant Likely case READING_U32: 682ca632f55SGrant Likely *(u32 *) (pl022->rx) = 683ca632f55SGrant Likely readl(SSP_DR(pl022->virtbase)); 684ca632f55SGrant Likely break; 685ca632f55SGrant Likely } 686ca632f55SGrant Likely pl022->rx += (pl022->cur_chip->n_bytes); 687ca632f55SGrant Likely pl022->exp_fifo_level--; 688ca632f55SGrant Likely } 689ca632f55SGrant Likely /* 690ca632f55SGrant Likely * Write as much as possible up to the RX FIFO size 691ca632f55SGrant Likely */ 692ca632f55SGrant Likely while ((pl022->exp_fifo_level < pl022->vendor->fifodepth) 693ca632f55SGrant Likely && (pl022->tx < pl022->tx_end)) { 694ca632f55SGrant Likely switch (pl022->write) { 695ca632f55SGrant Likely case WRITING_NULL: 696ca632f55SGrant Likely writew(0x0, SSP_DR(pl022->virtbase)); 697ca632f55SGrant Likely break; 698ca632f55SGrant Likely case WRITING_U8: 699ca632f55SGrant Likely writew(*(u8 *) (pl022->tx), SSP_DR(pl022->virtbase)); 700ca632f55SGrant Likely break; 701ca632f55SGrant Likely case WRITING_U16: 702ca632f55SGrant Likely writew((*(u16 *) (pl022->tx)), SSP_DR(pl022->virtbase)); 703ca632f55SGrant Likely break; 704ca632f55SGrant Likely case WRITING_U32: 705ca632f55SGrant Likely writel(*(u32 *) (pl022->tx), SSP_DR(pl022->virtbase)); 706ca632f55SGrant Likely break; 707ca632f55SGrant Likely } 708ca632f55SGrant Likely pl022->tx += (pl022->cur_chip->n_bytes); 709ca632f55SGrant Likely pl022->exp_fifo_level++; 710ca632f55SGrant Likely /* 711ca632f55SGrant Likely * This inner reader takes care of things appearing in the RX 712ca632f55SGrant Likely * FIFO as we're transmitting. This will happen a lot since the 713ca632f55SGrant Likely * clock starts running when you put things into the TX FIFO, 714ca632f55SGrant Likely * and then things are continuously clocked into the RX FIFO. 715ca632f55SGrant Likely */ 716ca632f55SGrant Likely while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) 717ca632f55SGrant Likely && (pl022->rx < pl022->rx_end)) { 718ca632f55SGrant Likely switch (pl022->read) { 719ca632f55SGrant Likely case READING_NULL: 720ca632f55SGrant Likely readw(SSP_DR(pl022->virtbase)); 721ca632f55SGrant Likely break; 722ca632f55SGrant Likely case READING_U8: 723ca632f55SGrant Likely *(u8 *) (pl022->rx) = 724ca632f55SGrant Likely readw(SSP_DR(pl022->virtbase)) & 0xFFU; 725ca632f55SGrant Likely break; 726ca632f55SGrant Likely case READING_U16: 727ca632f55SGrant Likely *(u16 *) (pl022->rx) = 728ca632f55SGrant Likely (u16) readw(SSP_DR(pl022->virtbase)); 729ca632f55SGrant Likely break; 730ca632f55SGrant Likely case READING_U32: 731ca632f55SGrant Likely *(u32 *) (pl022->rx) = 732ca632f55SGrant Likely readl(SSP_DR(pl022->virtbase)); 733ca632f55SGrant Likely break; 734ca632f55SGrant Likely } 735ca632f55SGrant Likely pl022->rx += (pl022->cur_chip->n_bytes); 736ca632f55SGrant Likely pl022->exp_fifo_level--; 737ca632f55SGrant Likely } 738ca632f55SGrant Likely } 739ca632f55SGrant Likely /* 740ca632f55SGrant Likely * When we exit here the TX FIFO should be full and the RX FIFO 741ca632f55SGrant Likely * should be empty 742ca632f55SGrant Likely */ 743ca632f55SGrant Likely } 744ca632f55SGrant Likely 745ca632f55SGrant Likely /** 746ca632f55SGrant Likely * next_transfer - Move to the Next transfer in the current spi message 747ca632f55SGrant Likely * @pl022: SSP driver private data structure 748ca632f55SGrant Likely * 749ca632f55SGrant Likely * This function moves though the linked list of spi transfers in the 750ca632f55SGrant Likely * current spi message and returns with the state of current spi 751ca632f55SGrant Likely * message i.e whether its last transfer is done(STATE_DONE) or 752ca632f55SGrant Likely * Next transfer is ready(STATE_RUNNING) 753ca632f55SGrant Likely */ 754ca632f55SGrant Likely static void *next_transfer(struct pl022 *pl022) 755ca632f55SGrant Likely { 756ca632f55SGrant Likely struct spi_message *msg = pl022->cur_msg; 757ca632f55SGrant Likely struct spi_transfer *trans = pl022->cur_transfer; 758ca632f55SGrant Likely 759ca632f55SGrant Likely /* Move to next transfer */ 760ca632f55SGrant Likely if (trans->transfer_list.next != &msg->transfers) { 761ca632f55SGrant Likely pl022->cur_transfer = 762ca632f55SGrant Likely list_entry(trans->transfer_list.next, 763ca632f55SGrant Likely struct spi_transfer, transfer_list); 764ca632f55SGrant Likely return STATE_RUNNING; 765ca632f55SGrant Likely } 766ca632f55SGrant Likely return STATE_DONE; 767ca632f55SGrant Likely } 768ca632f55SGrant Likely 769ca632f55SGrant Likely /* 770ca632f55SGrant Likely * This DMA functionality is only compiled in if we have 771ca632f55SGrant Likely * access to the generic DMA devices/DMA engine. 772ca632f55SGrant Likely */ 773ca632f55SGrant Likely #ifdef CONFIG_DMA_ENGINE 774ca632f55SGrant Likely static void unmap_free_dma_scatter(struct pl022 *pl022) 775ca632f55SGrant Likely { 776ca632f55SGrant Likely /* Unmap and free the SG tables */ 777ca632f55SGrant Likely dma_unmap_sg(pl022->dma_tx_channel->device->dev, pl022->sgt_tx.sgl, 778ca632f55SGrant Likely pl022->sgt_tx.nents, DMA_TO_DEVICE); 779ca632f55SGrant Likely dma_unmap_sg(pl022->dma_rx_channel->device->dev, pl022->sgt_rx.sgl, 780ca632f55SGrant Likely pl022->sgt_rx.nents, DMA_FROM_DEVICE); 781ca632f55SGrant Likely sg_free_table(&pl022->sgt_rx); 782ca632f55SGrant Likely sg_free_table(&pl022->sgt_tx); 783ca632f55SGrant Likely } 784ca632f55SGrant Likely 785ca632f55SGrant Likely static void dma_callback(void *data) 786ca632f55SGrant Likely { 787ca632f55SGrant Likely struct pl022 *pl022 = data; 788ca632f55SGrant Likely struct spi_message *msg = pl022->cur_msg; 789ca632f55SGrant Likely 790ca632f55SGrant Likely BUG_ON(!pl022->sgt_rx.sgl); 791ca632f55SGrant Likely 792ca632f55SGrant Likely #ifdef VERBOSE_DEBUG 793ca632f55SGrant Likely /* 794ca632f55SGrant Likely * Optionally dump out buffers to inspect contents, this is 795ca632f55SGrant Likely * good if you want to convince yourself that the loopback 796ca632f55SGrant Likely * read/write contents are the same, when adopting to a new 797ca632f55SGrant Likely * DMA engine. 798ca632f55SGrant Likely */ 799ca632f55SGrant Likely { 800ca632f55SGrant Likely struct scatterlist *sg; 801ca632f55SGrant Likely unsigned int i; 802ca632f55SGrant Likely 803ca632f55SGrant Likely dma_sync_sg_for_cpu(&pl022->adev->dev, 804ca632f55SGrant Likely pl022->sgt_rx.sgl, 805ca632f55SGrant Likely pl022->sgt_rx.nents, 806ca632f55SGrant Likely DMA_FROM_DEVICE); 807ca632f55SGrant Likely 808ca632f55SGrant Likely for_each_sg(pl022->sgt_rx.sgl, sg, pl022->sgt_rx.nents, i) { 809ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, "SPI RX SG ENTRY: %d", i); 810ca632f55SGrant Likely print_hex_dump(KERN_ERR, "SPI RX: ", 811ca632f55SGrant Likely DUMP_PREFIX_OFFSET, 812ca632f55SGrant Likely 16, 813ca632f55SGrant Likely 1, 814ca632f55SGrant Likely sg_virt(sg), 815ca632f55SGrant Likely sg_dma_len(sg), 816ca632f55SGrant Likely 1); 817ca632f55SGrant Likely } 818ca632f55SGrant Likely for_each_sg(pl022->sgt_tx.sgl, sg, pl022->sgt_tx.nents, i) { 819ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, "SPI TX SG ENTRY: %d", i); 820ca632f55SGrant Likely print_hex_dump(KERN_ERR, "SPI TX: ", 821ca632f55SGrant Likely DUMP_PREFIX_OFFSET, 822ca632f55SGrant Likely 16, 823ca632f55SGrant Likely 1, 824ca632f55SGrant Likely sg_virt(sg), 825ca632f55SGrant Likely sg_dma_len(sg), 826ca632f55SGrant Likely 1); 827ca632f55SGrant Likely } 828ca632f55SGrant Likely } 829ca632f55SGrant Likely #endif 830ca632f55SGrant Likely 831ca632f55SGrant Likely unmap_free_dma_scatter(pl022); 832ca632f55SGrant Likely 833ca632f55SGrant Likely /* Update total bytes transferred */ 834ca632f55SGrant Likely msg->actual_length += pl022->cur_transfer->len; 835ca632f55SGrant Likely if (pl022->cur_transfer->cs_change) 836f6f46de1SRoland Stigge pl022_cs_control(pl022, SSP_CHIP_DESELECT); 837ca632f55SGrant Likely 838ca632f55SGrant Likely /* Move to next transfer */ 839ca632f55SGrant Likely msg->state = next_transfer(pl022); 840ca632f55SGrant Likely tasklet_schedule(&pl022->pump_transfers); 841ca632f55SGrant Likely } 842ca632f55SGrant Likely 843ca632f55SGrant Likely static void setup_dma_scatter(struct pl022 *pl022, 844ca632f55SGrant Likely void *buffer, 845ca632f55SGrant Likely unsigned int length, 846ca632f55SGrant Likely struct sg_table *sgtab) 847ca632f55SGrant Likely { 848ca632f55SGrant Likely struct scatterlist *sg; 849ca632f55SGrant Likely int bytesleft = length; 850ca632f55SGrant Likely void *bufp = buffer; 851ca632f55SGrant Likely int mapbytes; 852ca632f55SGrant Likely int i; 853ca632f55SGrant Likely 854ca632f55SGrant Likely if (buffer) { 855ca632f55SGrant Likely for_each_sg(sgtab->sgl, sg, sgtab->nents, i) { 856ca632f55SGrant Likely /* 857ca632f55SGrant Likely * If there are less bytes left than what fits 858ca632f55SGrant Likely * in the current page (plus page alignment offset) 859ca632f55SGrant Likely * we just feed in this, else we stuff in as much 860ca632f55SGrant Likely * as we can. 861ca632f55SGrant Likely */ 862ca632f55SGrant Likely if (bytesleft < (PAGE_SIZE - offset_in_page(bufp))) 863ca632f55SGrant Likely mapbytes = bytesleft; 864ca632f55SGrant Likely else 865ca632f55SGrant Likely mapbytes = PAGE_SIZE - offset_in_page(bufp); 866ca632f55SGrant Likely sg_set_page(sg, virt_to_page(bufp), 867ca632f55SGrant Likely mapbytes, offset_in_page(bufp)); 868ca632f55SGrant Likely bufp += mapbytes; 869ca632f55SGrant Likely bytesleft -= mapbytes; 870ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, 871ca632f55SGrant Likely "set RX/TX target page @ %p, %d bytes, %d left\n", 872ca632f55SGrant Likely bufp, mapbytes, bytesleft); 873ca632f55SGrant Likely } 874ca632f55SGrant Likely } else { 875ca632f55SGrant Likely /* Map the dummy buffer on every page */ 876ca632f55SGrant Likely for_each_sg(sgtab->sgl, sg, sgtab->nents, i) { 877ca632f55SGrant Likely if (bytesleft < PAGE_SIZE) 878ca632f55SGrant Likely mapbytes = bytesleft; 879ca632f55SGrant Likely else 880ca632f55SGrant Likely mapbytes = PAGE_SIZE; 881ca632f55SGrant Likely sg_set_page(sg, virt_to_page(pl022->dummypage), 882ca632f55SGrant Likely mapbytes, 0); 883ca632f55SGrant Likely bytesleft -= mapbytes; 884ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, 885ca632f55SGrant Likely "set RX/TX to dummy page %d bytes, %d left\n", 886ca632f55SGrant Likely mapbytes, bytesleft); 887ca632f55SGrant Likely 888ca632f55SGrant Likely } 889ca632f55SGrant Likely } 890ca632f55SGrant Likely BUG_ON(bytesleft); 891ca632f55SGrant Likely } 892ca632f55SGrant Likely 893ca632f55SGrant Likely /** 894ca632f55SGrant Likely * configure_dma - configures the channels for the next transfer 895ca632f55SGrant Likely * @pl022: SSP driver's private data structure 896ca632f55SGrant Likely */ 897ca632f55SGrant Likely static int configure_dma(struct pl022 *pl022) 898ca632f55SGrant Likely { 899ca632f55SGrant Likely struct dma_slave_config rx_conf = { 900ca632f55SGrant Likely .src_addr = SSP_DR(pl022->phybase), 901a485df4bSVinod Koul .direction = DMA_DEV_TO_MEM, 902258aea76SViresh Kumar .device_fc = false, 903ca632f55SGrant Likely }; 904ca632f55SGrant Likely struct dma_slave_config tx_conf = { 905ca632f55SGrant Likely .dst_addr = SSP_DR(pl022->phybase), 906a485df4bSVinod Koul .direction = DMA_MEM_TO_DEV, 907258aea76SViresh Kumar .device_fc = false, 908ca632f55SGrant Likely }; 909ca632f55SGrant Likely unsigned int pages; 910ca632f55SGrant Likely int ret; 911ca632f55SGrant Likely int rx_sglen, tx_sglen; 912ca632f55SGrant Likely struct dma_chan *rxchan = pl022->dma_rx_channel; 913ca632f55SGrant Likely struct dma_chan *txchan = pl022->dma_tx_channel; 914ca632f55SGrant Likely struct dma_async_tx_descriptor *rxdesc; 915ca632f55SGrant Likely struct dma_async_tx_descriptor *txdesc; 916ca632f55SGrant Likely 917ca632f55SGrant Likely /* Check that the channels are available */ 918ca632f55SGrant Likely if (!rxchan || !txchan) 919ca632f55SGrant Likely return -ENODEV; 920ca632f55SGrant Likely 921083be3f0SLinus Walleij /* 922083be3f0SLinus Walleij * If supplied, the DMA burstsize should equal the FIFO trigger level. 923083be3f0SLinus Walleij * Notice that the DMA engine uses one-to-one mapping. Since we can 924083be3f0SLinus Walleij * not trigger on 2 elements this needs explicit mapping rather than 925083be3f0SLinus Walleij * calculation. 926083be3f0SLinus Walleij */ 927083be3f0SLinus Walleij switch (pl022->rx_lev_trig) { 928083be3f0SLinus Walleij case SSP_RX_1_OR_MORE_ELEM: 929083be3f0SLinus Walleij rx_conf.src_maxburst = 1; 930083be3f0SLinus Walleij break; 931083be3f0SLinus Walleij case SSP_RX_4_OR_MORE_ELEM: 932083be3f0SLinus Walleij rx_conf.src_maxburst = 4; 933083be3f0SLinus Walleij break; 934083be3f0SLinus Walleij case SSP_RX_8_OR_MORE_ELEM: 935083be3f0SLinus Walleij rx_conf.src_maxburst = 8; 936083be3f0SLinus Walleij break; 937083be3f0SLinus Walleij case SSP_RX_16_OR_MORE_ELEM: 938083be3f0SLinus Walleij rx_conf.src_maxburst = 16; 939083be3f0SLinus Walleij break; 940083be3f0SLinus Walleij case SSP_RX_32_OR_MORE_ELEM: 941083be3f0SLinus Walleij rx_conf.src_maxburst = 32; 942083be3f0SLinus Walleij break; 943083be3f0SLinus Walleij default: 944083be3f0SLinus Walleij rx_conf.src_maxburst = pl022->vendor->fifodepth >> 1; 945083be3f0SLinus Walleij break; 946083be3f0SLinus Walleij } 947083be3f0SLinus Walleij 948083be3f0SLinus Walleij switch (pl022->tx_lev_trig) { 949083be3f0SLinus Walleij case SSP_TX_1_OR_MORE_EMPTY_LOC: 950083be3f0SLinus Walleij tx_conf.dst_maxburst = 1; 951083be3f0SLinus Walleij break; 952083be3f0SLinus Walleij case SSP_TX_4_OR_MORE_EMPTY_LOC: 953083be3f0SLinus Walleij tx_conf.dst_maxburst = 4; 954083be3f0SLinus Walleij break; 955083be3f0SLinus Walleij case SSP_TX_8_OR_MORE_EMPTY_LOC: 956083be3f0SLinus Walleij tx_conf.dst_maxburst = 8; 957083be3f0SLinus Walleij break; 958083be3f0SLinus Walleij case SSP_TX_16_OR_MORE_EMPTY_LOC: 959083be3f0SLinus Walleij tx_conf.dst_maxburst = 16; 960083be3f0SLinus Walleij break; 961083be3f0SLinus Walleij case SSP_TX_32_OR_MORE_EMPTY_LOC: 962083be3f0SLinus Walleij tx_conf.dst_maxburst = 32; 963083be3f0SLinus Walleij break; 964083be3f0SLinus Walleij default: 965083be3f0SLinus Walleij tx_conf.dst_maxburst = pl022->vendor->fifodepth >> 1; 966083be3f0SLinus Walleij break; 967083be3f0SLinus Walleij } 968083be3f0SLinus Walleij 969ca632f55SGrant Likely switch (pl022->read) { 970ca632f55SGrant Likely case READING_NULL: 971ca632f55SGrant Likely /* Use the same as for writing */ 972ca632f55SGrant Likely rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED; 973ca632f55SGrant Likely break; 974ca632f55SGrant Likely case READING_U8: 975ca632f55SGrant Likely rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; 976ca632f55SGrant Likely break; 977ca632f55SGrant Likely case READING_U16: 978ca632f55SGrant Likely rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; 979ca632f55SGrant Likely break; 980ca632f55SGrant Likely case READING_U32: 981ca632f55SGrant Likely rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 982ca632f55SGrant Likely break; 983ca632f55SGrant Likely } 984ca632f55SGrant Likely 985ca632f55SGrant Likely switch (pl022->write) { 986ca632f55SGrant Likely case WRITING_NULL: 987ca632f55SGrant Likely /* Use the same as for reading */ 988ca632f55SGrant Likely tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED; 989ca632f55SGrant Likely break; 990ca632f55SGrant Likely case WRITING_U8: 991ca632f55SGrant Likely tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; 992ca632f55SGrant Likely break; 993ca632f55SGrant Likely case WRITING_U16: 994ca632f55SGrant Likely tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; 995ca632f55SGrant Likely break; 996ca632f55SGrant Likely case WRITING_U32: 997ca632f55SGrant Likely tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 998ca632f55SGrant Likely break; 999ca632f55SGrant Likely } 1000ca632f55SGrant Likely 1001ca632f55SGrant Likely /* SPI pecularity: we need to read and write the same width */ 1002ca632f55SGrant Likely if (rx_conf.src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) 1003ca632f55SGrant Likely rx_conf.src_addr_width = tx_conf.dst_addr_width; 1004ca632f55SGrant Likely if (tx_conf.dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) 1005ca632f55SGrant Likely tx_conf.dst_addr_width = rx_conf.src_addr_width; 1006ca632f55SGrant Likely BUG_ON(rx_conf.src_addr_width != tx_conf.dst_addr_width); 1007ca632f55SGrant Likely 1008ca632f55SGrant Likely dmaengine_slave_config(rxchan, &rx_conf); 1009ca632f55SGrant Likely dmaengine_slave_config(txchan, &tx_conf); 1010ca632f55SGrant Likely 1011ca632f55SGrant Likely /* Create sglists for the transfers */ 1012b181565eSViresh Kumar pages = DIV_ROUND_UP(pl022->cur_transfer->len, PAGE_SIZE); 1013ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, "using %d pages for transfer\n", pages); 1014ca632f55SGrant Likely 1015538a18dcSViresh Kumar ret = sg_alloc_table(&pl022->sgt_rx, pages, GFP_ATOMIC); 1016ca632f55SGrant Likely if (ret) 1017ca632f55SGrant Likely goto err_alloc_rx_sg; 1018ca632f55SGrant Likely 1019538a18dcSViresh Kumar ret = sg_alloc_table(&pl022->sgt_tx, pages, GFP_ATOMIC); 1020ca632f55SGrant Likely if (ret) 1021ca632f55SGrant Likely goto err_alloc_tx_sg; 1022ca632f55SGrant Likely 1023ca632f55SGrant Likely /* Fill in the scatterlists for the RX+TX buffers */ 1024ca632f55SGrant Likely setup_dma_scatter(pl022, pl022->rx, 1025ca632f55SGrant Likely pl022->cur_transfer->len, &pl022->sgt_rx); 1026ca632f55SGrant Likely setup_dma_scatter(pl022, pl022->tx, 1027ca632f55SGrant Likely pl022->cur_transfer->len, &pl022->sgt_tx); 1028ca632f55SGrant Likely 1029ca632f55SGrant Likely /* Map DMA buffers */ 1030ca632f55SGrant Likely rx_sglen = dma_map_sg(rxchan->device->dev, pl022->sgt_rx.sgl, 1031ca632f55SGrant Likely pl022->sgt_rx.nents, DMA_FROM_DEVICE); 1032ca632f55SGrant Likely if (!rx_sglen) 1033ca632f55SGrant Likely goto err_rx_sgmap; 1034ca632f55SGrant Likely 1035ca632f55SGrant Likely tx_sglen = dma_map_sg(txchan->device->dev, pl022->sgt_tx.sgl, 1036ca632f55SGrant Likely pl022->sgt_tx.nents, DMA_TO_DEVICE); 1037ca632f55SGrant Likely if (!tx_sglen) 1038ca632f55SGrant Likely goto err_tx_sgmap; 1039ca632f55SGrant Likely 1040ca632f55SGrant Likely /* Send both scatterlists */ 104116052827SAlexandre Bounine rxdesc = dmaengine_prep_slave_sg(rxchan, 1042ca632f55SGrant Likely pl022->sgt_rx.sgl, 1043ca632f55SGrant Likely rx_sglen, 1044a485df4bSVinod Koul DMA_DEV_TO_MEM, 1045ca632f55SGrant Likely DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 1046ca632f55SGrant Likely if (!rxdesc) 1047ca632f55SGrant Likely goto err_rxdesc; 1048ca632f55SGrant Likely 104916052827SAlexandre Bounine txdesc = dmaengine_prep_slave_sg(txchan, 1050ca632f55SGrant Likely pl022->sgt_tx.sgl, 1051ca632f55SGrant Likely tx_sglen, 1052a485df4bSVinod Koul DMA_MEM_TO_DEV, 1053ca632f55SGrant Likely DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 1054ca632f55SGrant Likely if (!txdesc) 1055ca632f55SGrant Likely goto err_txdesc; 1056ca632f55SGrant Likely 1057ca632f55SGrant Likely /* Put the callback on the RX transfer only, that should finish last */ 1058ca632f55SGrant Likely rxdesc->callback = dma_callback; 1059ca632f55SGrant Likely rxdesc->callback_param = pl022; 1060ca632f55SGrant Likely 1061ca632f55SGrant Likely /* Submit and fire RX and TX with TX last so we're ready to read! */ 1062ca632f55SGrant Likely dmaengine_submit(rxdesc); 1063ca632f55SGrant Likely dmaengine_submit(txdesc); 1064ca632f55SGrant Likely dma_async_issue_pending(rxchan); 1065ca632f55SGrant Likely dma_async_issue_pending(txchan); 1066ffbbdd21SLinus Walleij pl022->dma_running = true; 1067ca632f55SGrant Likely 1068ca632f55SGrant Likely return 0; 1069ca632f55SGrant Likely 1070ca632f55SGrant Likely err_txdesc: 1071ca632f55SGrant Likely dmaengine_terminate_all(txchan); 1072ca632f55SGrant Likely err_rxdesc: 1073ca632f55SGrant Likely dmaengine_terminate_all(rxchan); 1074ca632f55SGrant Likely dma_unmap_sg(txchan->device->dev, pl022->sgt_tx.sgl, 1075ca632f55SGrant Likely pl022->sgt_tx.nents, DMA_TO_DEVICE); 1076ca632f55SGrant Likely err_tx_sgmap: 1077ca632f55SGrant Likely dma_unmap_sg(rxchan->device->dev, pl022->sgt_rx.sgl, 1078ca632f55SGrant Likely pl022->sgt_tx.nents, DMA_FROM_DEVICE); 1079ca632f55SGrant Likely err_rx_sgmap: 1080ca632f55SGrant Likely sg_free_table(&pl022->sgt_tx); 1081ca632f55SGrant Likely err_alloc_tx_sg: 1082ca632f55SGrant Likely sg_free_table(&pl022->sgt_rx); 1083ca632f55SGrant Likely err_alloc_rx_sg: 1084ca632f55SGrant Likely return -ENOMEM; 1085ca632f55SGrant Likely } 1086ca632f55SGrant Likely 1087fd4a319bSGrant Likely static int pl022_dma_probe(struct pl022 *pl022) 1088ca632f55SGrant Likely { 1089ca632f55SGrant Likely dma_cap_mask_t mask; 1090ca632f55SGrant Likely 1091ca632f55SGrant Likely /* Try to acquire a generic DMA engine slave channel */ 1092ca632f55SGrant Likely dma_cap_zero(mask); 1093ca632f55SGrant Likely dma_cap_set(DMA_SLAVE, mask); 1094ca632f55SGrant Likely /* 1095ca632f55SGrant Likely * We need both RX and TX channels to do DMA, else do none 1096ca632f55SGrant Likely * of them. 1097ca632f55SGrant Likely */ 1098ca632f55SGrant Likely pl022->dma_rx_channel = dma_request_channel(mask, 1099ca632f55SGrant Likely pl022->master_info->dma_filter, 1100ca632f55SGrant Likely pl022->master_info->dma_rx_param); 1101ca632f55SGrant Likely if (!pl022->dma_rx_channel) { 1102ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, "no RX DMA channel!\n"); 1103ca632f55SGrant Likely goto err_no_rxchan; 1104ca632f55SGrant Likely } 1105ca632f55SGrant Likely 1106ca632f55SGrant Likely pl022->dma_tx_channel = dma_request_channel(mask, 1107ca632f55SGrant Likely pl022->master_info->dma_filter, 1108ca632f55SGrant Likely pl022->master_info->dma_tx_param); 1109ca632f55SGrant Likely if (!pl022->dma_tx_channel) { 1110ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, "no TX DMA channel!\n"); 1111ca632f55SGrant Likely goto err_no_txchan; 1112ca632f55SGrant Likely } 1113ca632f55SGrant Likely 1114ca632f55SGrant Likely pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL); 1115ca632f55SGrant Likely if (!pl022->dummypage) { 1116ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, "no DMA dummypage!\n"); 1117ca632f55SGrant Likely goto err_no_dummypage; 1118ca632f55SGrant Likely } 1119ca632f55SGrant Likely 1120ca632f55SGrant Likely dev_info(&pl022->adev->dev, "setup for DMA on RX %s, TX %s\n", 1121ca632f55SGrant Likely dma_chan_name(pl022->dma_rx_channel), 1122ca632f55SGrant Likely dma_chan_name(pl022->dma_tx_channel)); 1123ca632f55SGrant Likely 1124ca632f55SGrant Likely return 0; 1125ca632f55SGrant Likely 1126ca632f55SGrant Likely err_no_dummypage: 1127ca632f55SGrant Likely dma_release_channel(pl022->dma_tx_channel); 1128ca632f55SGrant Likely err_no_txchan: 1129ca632f55SGrant Likely dma_release_channel(pl022->dma_rx_channel); 1130ca632f55SGrant Likely pl022->dma_rx_channel = NULL; 1131ca632f55SGrant Likely err_no_rxchan: 1132ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1133ca632f55SGrant Likely "Failed to work in dma mode, work without dma!\n"); 1134ca632f55SGrant Likely return -ENODEV; 1135ca632f55SGrant Likely } 1136ca632f55SGrant Likely 1137dc715452SArnd Bergmann static int pl022_dma_autoprobe(struct pl022 *pl022) 1138dc715452SArnd Bergmann { 1139dc715452SArnd Bergmann struct device *dev = &pl022->adev->dev; 1140dc715452SArnd Bergmann 1141dc715452SArnd Bergmann /* automatically configure DMA channels from platform, normally using DT */ 1142dc715452SArnd Bergmann pl022->dma_rx_channel = dma_request_slave_channel(dev, "rx"); 1143dc715452SArnd Bergmann if (!pl022->dma_rx_channel) 1144dc715452SArnd Bergmann goto err_no_rxchan; 1145dc715452SArnd Bergmann 1146dc715452SArnd Bergmann pl022->dma_tx_channel = dma_request_slave_channel(dev, "tx"); 1147dc715452SArnd Bergmann if (!pl022->dma_tx_channel) 1148dc715452SArnd Bergmann goto err_no_txchan; 1149dc715452SArnd Bergmann 1150dc715452SArnd Bergmann pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL); 1151dc715452SArnd Bergmann if (!pl022->dummypage) 1152dc715452SArnd Bergmann goto err_no_dummypage; 1153dc715452SArnd Bergmann 1154dc715452SArnd Bergmann return 0; 1155dc715452SArnd Bergmann 1156dc715452SArnd Bergmann err_no_dummypage: 1157dc715452SArnd Bergmann dma_release_channel(pl022->dma_tx_channel); 1158dc715452SArnd Bergmann pl022->dma_tx_channel = NULL; 1159dc715452SArnd Bergmann err_no_txchan: 1160dc715452SArnd Bergmann dma_release_channel(pl022->dma_rx_channel); 1161dc715452SArnd Bergmann pl022->dma_rx_channel = NULL; 1162dc715452SArnd Bergmann err_no_rxchan: 1163dc715452SArnd Bergmann return -ENODEV; 1164dc715452SArnd Bergmann } 1165dc715452SArnd Bergmann 1166ca632f55SGrant Likely static void terminate_dma(struct pl022 *pl022) 1167ca632f55SGrant Likely { 1168ca632f55SGrant Likely struct dma_chan *rxchan = pl022->dma_rx_channel; 1169ca632f55SGrant Likely struct dma_chan *txchan = pl022->dma_tx_channel; 1170ca632f55SGrant Likely 1171ca632f55SGrant Likely dmaengine_terminate_all(rxchan); 1172ca632f55SGrant Likely dmaengine_terminate_all(txchan); 1173ca632f55SGrant Likely unmap_free_dma_scatter(pl022); 1174ffbbdd21SLinus Walleij pl022->dma_running = false; 1175ca632f55SGrant Likely } 1176ca632f55SGrant Likely 1177ca632f55SGrant Likely static void pl022_dma_remove(struct pl022 *pl022) 1178ca632f55SGrant Likely { 1179ffbbdd21SLinus Walleij if (pl022->dma_running) 1180ca632f55SGrant Likely terminate_dma(pl022); 1181ca632f55SGrant Likely if (pl022->dma_tx_channel) 1182ca632f55SGrant Likely dma_release_channel(pl022->dma_tx_channel); 1183ca632f55SGrant Likely if (pl022->dma_rx_channel) 1184ca632f55SGrant Likely dma_release_channel(pl022->dma_rx_channel); 1185ca632f55SGrant Likely kfree(pl022->dummypage); 1186ca632f55SGrant Likely } 1187ca632f55SGrant Likely 1188ca632f55SGrant Likely #else 1189ca632f55SGrant Likely static inline int configure_dma(struct pl022 *pl022) 1190ca632f55SGrant Likely { 1191ca632f55SGrant Likely return -ENODEV; 1192ca632f55SGrant Likely } 1193ca632f55SGrant Likely 1194dc715452SArnd Bergmann static inline int pl022_dma_autoprobe(struct pl022 *pl022) 1195dc715452SArnd Bergmann { 1196dc715452SArnd Bergmann return 0; 1197dc715452SArnd Bergmann } 1198dc715452SArnd Bergmann 1199ca632f55SGrant Likely static inline int pl022_dma_probe(struct pl022 *pl022) 1200ca632f55SGrant Likely { 1201ca632f55SGrant Likely return 0; 1202ca632f55SGrant Likely } 1203ca632f55SGrant Likely 1204ca632f55SGrant Likely static inline void pl022_dma_remove(struct pl022 *pl022) 1205ca632f55SGrant Likely { 1206ca632f55SGrant Likely } 1207ca632f55SGrant Likely #endif 1208ca632f55SGrant Likely 1209ca632f55SGrant Likely /** 1210ca632f55SGrant Likely * pl022_interrupt_handler - Interrupt handler for SSP controller 1211ca632f55SGrant Likely * 1212ca632f55SGrant Likely * This function handles interrupts generated for an interrupt based transfer. 1213ca632f55SGrant Likely * If a receive overrun (ROR) interrupt is there then we disable SSP, flag the 1214ca632f55SGrant Likely * current message's state as STATE_ERROR and schedule the tasklet 1215ca632f55SGrant Likely * pump_transfers which will do the postprocessing of the current message by 1216ca632f55SGrant Likely * calling giveback(). Otherwise it reads data from RX FIFO till there is no 1217ca632f55SGrant Likely * more data, and writes data in TX FIFO till it is not full. If we complete 1218ca632f55SGrant Likely * the transfer we move to the next transfer and schedule the tasklet. 1219ca632f55SGrant Likely */ 1220ca632f55SGrant Likely static irqreturn_t pl022_interrupt_handler(int irq, void *dev_id) 1221ca632f55SGrant Likely { 1222ca632f55SGrant Likely struct pl022 *pl022 = dev_id; 1223ca632f55SGrant Likely struct spi_message *msg = pl022->cur_msg; 1224ca632f55SGrant Likely u16 irq_status = 0; 1225ca632f55SGrant Likely u16 flag = 0; 1226ca632f55SGrant Likely 1227ca632f55SGrant Likely if (unlikely(!msg)) { 1228ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1229ca632f55SGrant Likely "bad message state in interrupt handler"); 1230ca632f55SGrant Likely /* Never fail */ 1231ca632f55SGrant Likely return IRQ_HANDLED; 1232ca632f55SGrant Likely } 1233ca632f55SGrant Likely 1234ca632f55SGrant Likely /* Read the Interrupt Status Register */ 1235ca632f55SGrant Likely irq_status = readw(SSP_MIS(pl022->virtbase)); 1236ca632f55SGrant Likely 1237ca632f55SGrant Likely if (unlikely(!irq_status)) 1238ca632f55SGrant Likely return IRQ_NONE; 1239ca632f55SGrant Likely 1240ca632f55SGrant Likely /* 1241ca632f55SGrant Likely * This handles the FIFO interrupts, the timeout 1242ca632f55SGrant Likely * interrupts are flatly ignored, they cannot be 1243ca632f55SGrant Likely * trusted. 1244ca632f55SGrant Likely */ 1245ca632f55SGrant Likely if (unlikely(irq_status & SSP_MIS_MASK_RORMIS)) { 1246ca632f55SGrant Likely /* 1247ca632f55SGrant Likely * Overrun interrupt - bail out since our Data has been 1248ca632f55SGrant Likely * corrupted 1249ca632f55SGrant Likely */ 1250ca632f55SGrant Likely dev_err(&pl022->adev->dev, "FIFO overrun\n"); 1251ca632f55SGrant Likely if (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RFF) 1252ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1253ca632f55SGrant Likely "RXFIFO is full\n"); 1254ca632f55SGrant Likely if (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_TNF) 1255ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1256ca632f55SGrant Likely "TXFIFO is full\n"); 1257ca632f55SGrant Likely 1258ca632f55SGrant Likely /* 1259ca632f55SGrant Likely * Disable and clear interrupts, disable SSP, 1260ca632f55SGrant Likely * mark message with bad status so it can be 1261ca632f55SGrant Likely * retried. 1262ca632f55SGrant Likely */ 1263ca632f55SGrant Likely writew(DISABLE_ALL_INTERRUPTS, 1264ca632f55SGrant Likely SSP_IMSC(pl022->virtbase)); 1265ca632f55SGrant Likely writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); 1266ca632f55SGrant Likely writew((readw(SSP_CR1(pl022->virtbase)) & 1267ca632f55SGrant Likely (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); 1268ca632f55SGrant Likely msg->state = STATE_ERROR; 1269ca632f55SGrant Likely 1270ca632f55SGrant Likely /* Schedule message queue handler */ 1271ca632f55SGrant Likely tasklet_schedule(&pl022->pump_transfers); 1272ca632f55SGrant Likely return IRQ_HANDLED; 1273ca632f55SGrant Likely } 1274ca632f55SGrant Likely 1275ca632f55SGrant Likely readwriter(pl022); 1276ca632f55SGrant Likely 1277ca632f55SGrant Likely if ((pl022->tx == pl022->tx_end) && (flag == 0)) { 1278ca632f55SGrant Likely flag = 1; 1279172289dfSChris Blair /* Disable Transmit interrupt, enable receive interrupt */ 1280172289dfSChris Blair writew((readw(SSP_IMSC(pl022->virtbase)) & 1281172289dfSChris Blair ~SSP_IMSC_MASK_TXIM) | SSP_IMSC_MASK_RXIM, 1282ca632f55SGrant Likely SSP_IMSC(pl022->virtbase)); 1283ca632f55SGrant Likely } 1284ca632f55SGrant Likely 1285ca632f55SGrant Likely /* 1286ca632f55SGrant Likely * Since all transactions must write as much as shall be read, 1287ca632f55SGrant Likely * we can conclude the entire transaction once RX is complete. 1288ca632f55SGrant Likely * At this point, all TX will always be finished. 1289ca632f55SGrant Likely */ 1290ca632f55SGrant Likely if (pl022->rx >= pl022->rx_end) { 1291ca632f55SGrant Likely writew(DISABLE_ALL_INTERRUPTS, 1292ca632f55SGrant Likely SSP_IMSC(pl022->virtbase)); 1293ca632f55SGrant Likely writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); 1294ca632f55SGrant Likely if (unlikely(pl022->rx > pl022->rx_end)) { 1295ca632f55SGrant Likely dev_warn(&pl022->adev->dev, "read %u surplus " 1296ca632f55SGrant Likely "bytes (did you request an odd " 1297ca632f55SGrant Likely "number of bytes on a 16bit bus?)\n", 1298ca632f55SGrant Likely (u32) (pl022->rx - pl022->rx_end)); 1299ca632f55SGrant Likely } 1300ca632f55SGrant Likely /* Update total bytes transferred */ 1301ca632f55SGrant Likely msg->actual_length += pl022->cur_transfer->len; 1302ca632f55SGrant Likely if (pl022->cur_transfer->cs_change) 1303f6f46de1SRoland Stigge pl022_cs_control(pl022, SSP_CHIP_DESELECT); 1304ca632f55SGrant Likely /* Move to next transfer */ 1305ca632f55SGrant Likely msg->state = next_transfer(pl022); 1306ca632f55SGrant Likely tasklet_schedule(&pl022->pump_transfers); 1307ca632f55SGrant Likely return IRQ_HANDLED; 1308ca632f55SGrant Likely } 1309ca632f55SGrant Likely 1310ca632f55SGrant Likely return IRQ_HANDLED; 1311ca632f55SGrant Likely } 1312ca632f55SGrant Likely 1313ca632f55SGrant Likely /** 1314ca632f55SGrant Likely * This sets up the pointers to memory for the next message to 1315ca632f55SGrant Likely * send out on the SPI bus. 1316ca632f55SGrant Likely */ 1317ca632f55SGrant Likely static int set_up_next_transfer(struct pl022 *pl022, 1318ca632f55SGrant Likely struct spi_transfer *transfer) 1319ca632f55SGrant Likely { 1320ca632f55SGrant Likely int residue; 1321ca632f55SGrant Likely 1322ca632f55SGrant Likely /* Sanity check the message for this bus width */ 1323ca632f55SGrant Likely residue = pl022->cur_transfer->len % pl022->cur_chip->n_bytes; 1324ca632f55SGrant Likely if (unlikely(residue != 0)) { 1325ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1326ca632f55SGrant Likely "message of %u bytes to transmit but the current " 1327ca632f55SGrant Likely "chip bus has a data width of %u bytes!\n", 1328ca632f55SGrant Likely pl022->cur_transfer->len, 1329ca632f55SGrant Likely pl022->cur_chip->n_bytes); 1330ca632f55SGrant Likely dev_err(&pl022->adev->dev, "skipping this message\n"); 1331ca632f55SGrant Likely return -EIO; 1332ca632f55SGrant Likely } 1333ca632f55SGrant Likely pl022->tx = (void *)transfer->tx_buf; 1334ca632f55SGrant Likely pl022->tx_end = pl022->tx + pl022->cur_transfer->len; 1335ca632f55SGrant Likely pl022->rx = (void *)transfer->rx_buf; 1336ca632f55SGrant Likely pl022->rx_end = pl022->rx + pl022->cur_transfer->len; 1337ca632f55SGrant Likely pl022->write = 1338ca632f55SGrant Likely pl022->tx ? pl022->cur_chip->write : WRITING_NULL; 1339ca632f55SGrant Likely pl022->read = pl022->rx ? pl022->cur_chip->read : READING_NULL; 1340ca632f55SGrant Likely return 0; 1341ca632f55SGrant Likely } 1342ca632f55SGrant Likely 1343ca632f55SGrant Likely /** 1344ca632f55SGrant Likely * pump_transfers - Tasklet function which schedules next transfer 1345ca632f55SGrant Likely * when running in interrupt or DMA transfer mode. 1346ca632f55SGrant Likely * @data: SSP driver private data structure 1347ca632f55SGrant Likely * 1348ca632f55SGrant Likely */ 1349ca632f55SGrant Likely static void pump_transfers(unsigned long data) 1350ca632f55SGrant Likely { 1351ca632f55SGrant Likely struct pl022 *pl022 = (struct pl022 *) data; 1352ca632f55SGrant Likely struct spi_message *message = NULL; 1353ca632f55SGrant Likely struct spi_transfer *transfer = NULL; 1354ca632f55SGrant Likely struct spi_transfer *previous = NULL; 1355ca632f55SGrant Likely 1356ca632f55SGrant Likely /* Get current state information */ 1357ca632f55SGrant Likely message = pl022->cur_msg; 1358ca632f55SGrant Likely transfer = pl022->cur_transfer; 1359ca632f55SGrant Likely 1360ca632f55SGrant Likely /* Handle for abort */ 1361ca632f55SGrant Likely if (message->state == STATE_ERROR) { 1362ca632f55SGrant Likely message->status = -EIO; 1363ca632f55SGrant Likely giveback(pl022); 1364ca632f55SGrant Likely return; 1365ca632f55SGrant Likely } 1366ca632f55SGrant Likely 1367ca632f55SGrant Likely /* Handle end of message */ 1368ca632f55SGrant Likely if (message->state == STATE_DONE) { 1369ca632f55SGrant Likely message->status = 0; 1370ca632f55SGrant Likely giveback(pl022); 1371ca632f55SGrant Likely return; 1372ca632f55SGrant Likely } 1373ca632f55SGrant Likely 1374ca632f55SGrant Likely /* Delay if requested at end of transfer before CS change */ 1375ca632f55SGrant Likely if (message->state == STATE_RUNNING) { 1376ca632f55SGrant Likely previous = list_entry(transfer->transfer_list.prev, 1377ca632f55SGrant Likely struct spi_transfer, 1378ca632f55SGrant Likely transfer_list); 1379ca632f55SGrant Likely if (previous->delay_usecs) 1380ca632f55SGrant Likely /* 1381ca632f55SGrant Likely * FIXME: This runs in interrupt context. 1382ca632f55SGrant Likely * Is this really smart? 1383ca632f55SGrant Likely */ 1384ca632f55SGrant Likely udelay(previous->delay_usecs); 1385ca632f55SGrant Likely 13868b8d7191SVirupax Sadashivpetimath /* Reselect chip select only if cs_change was requested */ 1387ca632f55SGrant Likely if (previous->cs_change) 1388f6f46de1SRoland Stigge pl022_cs_control(pl022, SSP_CHIP_SELECT); 1389ca632f55SGrant Likely } else { 1390ca632f55SGrant Likely /* STATE_START */ 1391ca632f55SGrant Likely message->state = STATE_RUNNING; 1392ca632f55SGrant Likely } 1393ca632f55SGrant Likely 1394ca632f55SGrant Likely if (set_up_next_transfer(pl022, transfer)) { 1395ca632f55SGrant Likely message->state = STATE_ERROR; 1396ca632f55SGrant Likely message->status = -EIO; 1397ca632f55SGrant Likely giveback(pl022); 1398ca632f55SGrant Likely return; 1399ca632f55SGrant Likely } 1400ca632f55SGrant Likely /* Flush the FIFOs and let's go! */ 1401ca632f55SGrant Likely flush(pl022); 1402ca632f55SGrant Likely 1403ca632f55SGrant Likely if (pl022->cur_chip->enable_dma) { 1404ca632f55SGrant Likely if (configure_dma(pl022)) { 1405ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, 1406ca632f55SGrant Likely "configuration of DMA failed, fall back to interrupt mode\n"); 1407ca632f55SGrant Likely goto err_config_dma; 1408ca632f55SGrant Likely } 1409ca632f55SGrant Likely return; 1410ca632f55SGrant Likely } 1411ca632f55SGrant Likely 1412ca632f55SGrant Likely err_config_dma: 1413172289dfSChris Blair /* enable all interrupts except RX */ 1414172289dfSChris Blair writew(ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM, SSP_IMSC(pl022->virtbase)); 1415ca632f55SGrant Likely } 1416ca632f55SGrant Likely 1417ca632f55SGrant Likely static void do_interrupt_dma_transfer(struct pl022 *pl022) 1418ca632f55SGrant Likely { 1419172289dfSChris Blair /* 1420172289dfSChris Blair * Default is to enable all interrupts except RX - 1421172289dfSChris Blair * this will be enabled once TX is complete 1422172289dfSChris Blair */ 1423172289dfSChris Blair u32 irqflags = ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM; 1424ca632f55SGrant Likely 14258b8d7191SVirupax Sadashivpetimath /* Enable target chip, if not already active */ 14268b8d7191SVirupax Sadashivpetimath if (!pl022->next_msg_cs_active) 1427f6f46de1SRoland Stigge pl022_cs_control(pl022, SSP_CHIP_SELECT); 14288b8d7191SVirupax Sadashivpetimath 1429ca632f55SGrant Likely if (set_up_next_transfer(pl022, pl022->cur_transfer)) { 1430ca632f55SGrant Likely /* Error path */ 1431ca632f55SGrant Likely pl022->cur_msg->state = STATE_ERROR; 1432ca632f55SGrant Likely pl022->cur_msg->status = -EIO; 1433ca632f55SGrant Likely giveback(pl022); 1434ca632f55SGrant Likely return; 1435ca632f55SGrant Likely } 1436ca632f55SGrant Likely /* If we're using DMA, set up DMA here */ 1437ca632f55SGrant Likely if (pl022->cur_chip->enable_dma) { 1438ca632f55SGrant Likely /* Configure DMA transfer */ 1439ca632f55SGrant Likely if (configure_dma(pl022)) { 1440ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, 1441ca632f55SGrant Likely "configuration of DMA failed, fall back to interrupt mode\n"); 1442ca632f55SGrant Likely goto err_config_dma; 1443ca632f55SGrant Likely } 1444ca632f55SGrant Likely /* Disable interrupts in DMA mode, IRQ from DMA controller */ 1445ca632f55SGrant Likely irqflags = DISABLE_ALL_INTERRUPTS; 1446ca632f55SGrant Likely } 1447ca632f55SGrant Likely err_config_dma: 1448ca632f55SGrant Likely /* Enable SSP, turn on interrupts */ 1449ca632f55SGrant Likely writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE), 1450ca632f55SGrant Likely SSP_CR1(pl022->virtbase)); 1451ca632f55SGrant Likely writew(irqflags, SSP_IMSC(pl022->virtbase)); 1452ca632f55SGrant Likely } 1453ca632f55SGrant Likely 1454ca632f55SGrant Likely static void do_polling_transfer(struct pl022 *pl022) 1455ca632f55SGrant Likely { 1456ca632f55SGrant Likely struct spi_message *message = NULL; 1457ca632f55SGrant Likely struct spi_transfer *transfer = NULL; 1458ca632f55SGrant Likely struct spi_transfer *previous = NULL; 1459ca632f55SGrant Likely struct chip_data *chip; 1460ca632f55SGrant Likely unsigned long time, timeout; 1461ca632f55SGrant Likely 1462ca632f55SGrant Likely chip = pl022->cur_chip; 1463ca632f55SGrant Likely message = pl022->cur_msg; 1464ca632f55SGrant Likely 1465ca632f55SGrant Likely while (message->state != STATE_DONE) { 1466ca632f55SGrant Likely /* Handle for abort */ 1467ca632f55SGrant Likely if (message->state == STATE_ERROR) 1468ca632f55SGrant Likely break; 1469ca632f55SGrant Likely transfer = pl022->cur_transfer; 1470ca632f55SGrant Likely 1471ca632f55SGrant Likely /* Delay if requested at end of transfer */ 1472ca632f55SGrant Likely if (message->state == STATE_RUNNING) { 1473ca632f55SGrant Likely previous = 1474ca632f55SGrant Likely list_entry(transfer->transfer_list.prev, 1475ca632f55SGrant Likely struct spi_transfer, transfer_list); 1476ca632f55SGrant Likely if (previous->delay_usecs) 1477ca632f55SGrant Likely udelay(previous->delay_usecs); 1478ca632f55SGrant Likely if (previous->cs_change) 1479f6f46de1SRoland Stigge pl022_cs_control(pl022, SSP_CHIP_SELECT); 1480ca632f55SGrant Likely } else { 1481ca632f55SGrant Likely /* STATE_START */ 1482ca632f55SGrant Likely message->state = STATE_RUNNING; 14838b8d7191SVirupax Sadashivpetimath if (!pl022->next_msg_cs_active) 1484f6f46de1SRoland Stigge pl022_cs_control(pl022, SSP_CHIP_SELECT); 1485ca632f55SGrant Likely } 1486ca632f55SGrant Likely 1487ca632f55SGrant Likely /* Configuration Changing Per Transfer */ 1488ca632f55SGrant Likely if (set_up_next_transfer(pl022, transfer)) { 1489ca632f55SGrant Likely /* Error path */ 1490ca632f55SGrant Likely message->state = STATE_ERROR; 1491ca632f55SGrant Likely break; 1492ca632f55SGrant Likely } 1493ca632f55SGrant Likely /* Flush FIFOs and enable SSP */ 1494ca632f55SGrant Likely flush(pl022); 1495ca632f55SGrant Likely writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE), 1496ca632f55SGrant Likely SSP_CR1(pl022->virtbase)); 1497ca632f55SGrant Likely 1498ca632f55SGrant Likely dev_dbg(&pl022->adev->dev, "polling transfer ongoing ...\n"); 1499ca632f55SGrant Likely 1500ca632f55SGrant Likely timeout = jiffies + msecs_to_jiffies(SPI_POLLING_TIMEOUT); 1501ca632f55SGrant Likely while (pl022->tx < pl022->tx_end || pl022->rx < pl022->rx_end) { 1502ca632f55SGrant Likely time = jiffies; 1503ca632f55SGrant Likely readwriter(pl022); 1504ca632f55SGrant Likely if (time_after(time, timeout)) { 1505ca632f55SGrant Likely dev_warn(&pl022->adev->dev, 1506ca632f55SGrant Likely "%s: timeout!\n", __func__); 1507ca632f55SGrant Likely message->state = STATE_ERROR; 1508ca632f55SGrant Likely goto out; 1509ca632f55SGrant Likely } 1510ca632f55SGrant Likely cpu_relax(); 1511ca632f55SGrant Likely } 1512ca632f55SGrant Likely 1513ca632f55SGrant Likely /* Update total byte transferred */ 1514ca632f55SGrant Likely message->actual_length += pl022->cur_transfer->len; 1515ca632f55SGrant Likely if (pl022->cur_transfer->cs_change) 1516f6f46de1SRoland Stigge pl022_cs_control(pl022, SSP_CHIP_DESELECT); 1517ca632f55SGrant Likely /* Move to next transfer */ 1518ca632f55SGrant Likely message->state = next_transfer(pl022); 1519ca632f55SGrant Likely } 1520ca632f55SGrant Likely out: 1521ca632f55SGrant Likely /* Handle end of message */ 1522ca632f55SGrant Likely if (message->state == STATE_DONE) 1523ca632f55SGrant Likely message->status = 0; 1524ca632f55SGrant Likely else 1525ca632f55SGrant Likely message->status = -EIO; 1526ca632f55SGrant Likely 1527ca632f55SGrant Likely giveback(pl022); 1528ca632f55SGrant Likely return; 1529ca632f55SGrant Likely } 1530ca632f55SGrant Likely 1531ffbbdd21SLinus Walleij static int pl022_transfer_one_message(struct spi_master *master, 1532ffbbdd21SLinus Walleij struct spi_message *msg) 1533ca632f55SGrant Likely { 1534ffbbdd21SLinus Walleij struct pl022 *pl022 = spi_master_get_devdata(master); 1535ca632f55SGrant Likely 1536ffbbdd21SLinus Walleij /* Initial message state */ 1537ffbbdd21SLinus Walleij pl022->cur_msg = msg; 1538ffbbdd21SLinus Walleij msg->state = STATE_START; 1539ffbbdd21SLinus Walleij 1540ffbbdd21SLinus Walleij pl022->cur_transfer = list_entry(msg->transfers.next, 1541ffbbdd21SLinus Walleij struct spi_transfer, transfer_list); 1542ffbbdd21SLinus Walleij 1543ffbbdd21SLinus Walleij /* Setup the SPI using the per chip configuration */ 1544ffbbdd21SLinus Walleij pl022->cur_chip = spi_get_ctldata(msg->spi); 1545f6f46de1SRoland Stigge pl022->cur_cs = pl022->chipselects[msg->spi->chip_select]; 1546ffbbdd21SLinus Walleij 1547ffbbdd21SLinus Walleij restore_state(pl022); 1548ffbbdd21SLinus Walleij flush(pl022); 1549ffbbdd21SLinus Walleij 1550ffbbdd21SLinus Walleij if (pl022->cur_chip->xfer_type == POLLING_TRANSFER) 1551ffbbdd21SLinus Walleij do_polling_transfer(pl022); 1552ffbbdd21SLinus Walleij else 1553ffbbdd21SLinus Walleij do_interrupt_dma_transfer(pl022); 1554ffbbdd21SLinus Walleij 1555ffbbdd21SLinus Walleij return 0; 1556ffbbdd21SLinus Walleij } 1557ffbbdd21SLinus Walleij 1558ffbbdd21SLinus Walleij static int pl022_unprepare_transfer_hardware(struct spi_master *master) 1559ffbbdd21SLinus Walleij { 1560ffbbdd21SLinus Walleij struct pl022 *pl022 = spi_master_get_devdata(master); 1561ffbbdd21SLinus Walleij 15620ad2deeaSVirupax Sadashivpetimath /* nothing more to do - disable spi/ssp and power off */ 15630ad2deeaSVirupax Sadashivpetimath writew((readw(SSP_CR1(pl022->virtbase)) & 15640ad2deeaSVirupax Sadashivpetimath (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); 156553e4aceaSChris Blair 1566ca632f55SGrant Likely return 0; 1567ca632f55SGrant Likely } 1568ca632f55SGrant Likely 1569ca632f55SGrant Likely static int verify_controller_parameters(struct pl022 *pl022, 1570ca632f55SGrant Likely struct pl022_config_chip const *chip_info) 1571ca632f55SGrant Likely { 1572ca632f55SGrant Likely if ((chip_info->iface < SSP_INTERFACE_MOTOROLA_SPI) 1573ca632f55SGrant Likely || (chip_info->iface > SSP_INTERFACE_UNIDIRECTIONAL)) { 1574ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1575ca632f55SGrant Likely "interface is configured incorrectly\n"); 1576ca632f55SGrant Likely return -EINVAL; 1577ca632f55SGrant Likely } 1578ca632f55SGrant Likely if ((chip_info->iface == SSP_INTERFACE_UNIDIRECTIONAL) && 1579ca632f55SGrant Likely (!pl022->vendor->unidir)) { 1580ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1581ca632f55SGrant Likely "unidirectional mode not supported in this " 1582ca632f55SGrant Likely "hardware version\n"); 1583ca632f55SGrant Likely return -EINVAL; 1584ca632f55SGrant Likely } 1585ca632f55SGrant Likely if ((chip_info->hierarchy != SSP_MASTER) 1586ca632f55SGrant Likely && (chip_info->hierarchy != SSP_SLAVE)) { 1587ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1588ca632f55SGrant Likely "hierarchy is configured incorrectly\n"); 1589ca632f55SGrant Likely return -EINVAL; 1590ca632f55SGrant Likely } 1591ca632f55SGrant Likely if ((chip_info->com_mode != INTERRUPT_TRANSFER) 1592ca632f55SGrant Likely && (chip_info->com_mode != DMA_TRANSFER) 1593ca632f55SGrant Likely && (chip_info->com_mode != POLLING_TRANSFER)) { 1594ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1595ca632f55SGrant Likely "Communication mode is configured incorrectly\n"); 1596ca632f55SGrant Likely return -EINVAL; 1597ca632f55SGrant Likely } 159878b2b911SLinus Walleij switch (chip_info->rx_lev_trig) { 159978b2b911SLinus Walleij case SSP_RX_1_OR_MORE_ELEM: 160078b2b911SLinus Walleij case SSP_RX_4_OR_MORE_ELEM: 160178b2b911SLinus Walleij case SSP_RX_8_OR_MORE_ELEM: 160278b2b911SLinus Walleij /* These are always OK, all variants can handle this */ 160378b2b911SLinus Walleij break; 160478b2b911SLinus Walleij case SSP_RX_16_OR_MORE_ELEM: 160578b2b911SLinus Walleij if (pl022->vendor->fifodepth < 16) { 1606ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1607ca632f55SGrant Likely "RX FIFO Trigger Level is configured incorrectly\n"); 1608ca632f55SGrant Likely return -EINVAL; 1609ca632f55SGrant Likely } 161078b2b911SLinus Walleij break; 161178b2b911SLinus Walleij case SSP_RX_32_OR_MORE_ELEM: 161278b2b911SLinus Walleij if (pl022->vendor->fifodepth < 32) { 161378b2b911SLinus Walleij dev_err(&pl022->adev->dev, 161478b2b911SLinus Walleij "RX FIFO Trigger Level is configured incorrectly\n"); 161578b2b911SLinus Walleij return -EINVAL; 161678b2b911SLinus Walleij } 161778b2b911SLinus Walleij break; 161878b2b911SLinus Walleij default: 161978b2b911SLinus Walleij dev_err(&pl022->adev->dev, 162078b2b911SLinus Walleij "RX FIFO Trigger Level is configured incorrectly\n"); 162178b2b911SLinus Walleij return -EINVAL; 162278b2b911SLinus Walleij } 162378b2b911SLinus Walleij switch (chip_info->tx_lev_trig) { 162478b2b911SLinus Walleij case SSP_TX_1_OR_MORE_EMPTY_LOC: 162578b2b911SLinus Walleij case SSP_TX_4_OR_MORE_EMPTY_LOC: 162678b2b911SLinus Walleij case SSP_TX_8_OR_MORE_EMPTY_LOC: 162778b2b911SLinus Walleij /* These are always OK, all variants can handle this */ 162878b2b911SLinus Walleij break; 162978b2b911SLinus Walleij case SSP_TX_16_OR_MORE_EMPTY_LOC: 163078b2b911SLinus Walleij if (pl022->vendor->fifodepth < 16) { 1631ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1632ca632f55SGrant Likely "TX FIFO Trigger Level is configured incorrectly\n"); 1633ca632f55SGrant Likely return -EINVAL; 1634ca632f55SGrant Likely } 163578b2b911SLinus Walleij break; 163678b2b911SLinus Walleij case SSP_TX_32_OR_MORE_EMPTY_LOC: 163778b2b911SLinus Walleij if (pl022->vendor->fifodepth < 32) { 163878b2b911SLinus Walleij dev_err(&pl022->adev->dev, 163978b2b911SLinus Walleij "TX FIFO Trigger Level is configured incorrectly\n"); 164078b2b911SLinus Walleij return -EINVAL; 164178b2b911SLinus Walleij } 164278b2b911SLinus Walleij break; 164378b2b911SLinus Walleij default: 164478b2b911SLinus Walleij dev_err(&pl022->adev->dev, 164578b2b911SLinus Walleij "TX FIFO Trigger Level is configured incorrectly\n"); 164678b2b911SLinus Walleij return -EINVAL; 164778b2b911SLinus Walleij } 1648ca632f55SGrant Likely if (chip_info->iface == SSP_INTERFACE_NATIONAL_MICROWIRE) { 1649ca632f55SGrant Likely if ((chip_info->ctrl_len < SSP_BITS_4) 1650ca632f55SGrant Likely || (chip_info->ctrl_len > SSP_BITS_32)) { 1651ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1652ca632f55SGrant Likely "CTRL LEN is configured incorrectly\n"); 1653ca632f55SGrant Likely return -EINVAL; 1654ca632f55SGrant Likely } 1655ca632f55SGrant Likely if ((chip_info->wait_state != SSP_MWIRE_WAIT_ZERO) 1656ca632f55SGrant Likely && (chip_info->wait_state != SSP_MWIRE_WAIT_ONE)) { 1657ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1658ca632f55SGrant Likely "Wait State is configured incorrectly\n"); 1659ca632f55SGrant Likely return -EINVAL; 1660ca632f55SGrant Likely } 1661ca632f55SGrant Likely /* Half duplex is only available in the ST Micro version */ 1662ca632f55SGrant Likely if (pl022->vendor->extended_cr) { 1663ca632f55SGrant Likely if ((chip_info->duplex != 1664ca632f55SGrant Likely SSP_MICROWIRE_CHANNEL_FULL_DUPLEX) 1665ca632f55SGrant Likely && (chip_info->duplex != 1666ca632f55SGrant Likely SSP_MICROWIRE_CHANNEL_HALF_DUPLEX)) { 1667ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1668ca632f55SGrant Likely "Microwire duplex mode is configured incorrectly\n"); 1669ca632f55SGrant Likely return -EINVAL; 1670ca632f55SGrant Likely } 1671ca632f55SGrant Likely } else { 1672ca632f55SGrant Likely if (chip_info->duplex != SSP_MICROWIRE_CHANNEL_FULL_DUPLEX) 1673ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1674ca632f55SGrant Likely "Microwire half duplex mode requested," 1675ca632f55SGrant Likely " but this is only available in the" 1676ca632f55SGrant Likely " ST version of PL022\n"); 1677ca632f55SGrant Likely return -EINVAL; 1678ca632f55SGrant Likely } 1679ca632f55SGrant Likely } 1680ca632f55SGrant Likely return 0; 1681ca632f55SGrant Likely } 1682ca632f55SGrant Likely 16830379b2a3SViresh Kumar static inline u32 spi_rate(u32 rate, u16 cpsdvsr, u16 scr) 16840379b2a3SViresh Kumar { 16850379b2a3SViresh Kumar return rate / (cpsdvsr * (1 + scr)); 16860379b2a3SViresh Kumar } 16870379b2a3SViresh Kumar 16880379b2a3SViresh Kumar static int calculate_effective_freq(struct pl022 *pl022, int freq, struct 16890379b2a3SViresh Kumar ssp_clock_params * clk_freq) 1690ca632f55SGrant Likely { 1691ca632f55SGrant Likely /* Lets calculate the frequency parameters */ 16920379b2a3SViresh Kumar u16 cpsdvsr = CPSDVR_MIN, scr = SCR_MIN; 16930379b2a3SViresh Kumar u32 rate, max_tclk, min_tclk, best_freq = 0, best_cpsdvsr = 0, 16940379b2a3SViresh Kumar best_scr = 0, tmp, found = 0; 1695ca632f55SGrant Likely 1696ca632f55SGrant Likely rate = clk_get_rate(pl022->clk); 1697ca632f55SGrant Likely /* cpsdvscr = 2 & scr 0 */ 16980379b2a3SViresh Kumar max_tclk = spi_rate(rate, CPSDVR_MIN, SCR_MIN); 1699ca632f55SGrant Likely /* cpsdvsr = 254 & scr = 255 */ 17000379b2a3SViresh Kumar min_tclk = spi_rate(rate, CPSDVR_MAX, SCR_MAX); 1701ca632f55SGrant Likely 1702ea505bc9SViresh Kumar if (freq > max_tclk) 1703ea505bc9SViresh Kumar dev_warn(&pl022->adev->dev, 1704ea505bc9SViresh Kumar "Max speed that can be programmed is %d Hz, you requested %d\n", 1705ea505bc9SViresh Kumar max_tclk, freq); 1706ea505bc9SViresh Kumar 1707ea505bc9SViresh Kumar if (freq < min_tclk) { 1708ca632f55SGrant Likely dev_err(&pl022->adev->dev, 1709ea505bc9SViresh Kumar "Requested frequency: %d Hz is less than minimum possible %d Hz\n", 1710ea505bc9SViresh Kumar freq, min_tclk); 1711ca632f55SGrant Likely return -EINVAL; 1712ca632f55SGrant Likely } 17130379b2a3SViresh Kumar 17140379b2a3SViresh Kumar /* 17150379b2a3SViresh Kumar * best_freq will give closest possible available rate (<= requested 17160379b2a3SViresh Kumar * freq) for all values of scr & cpsdvsr. 17170379b2a3SViresh Kumar */ 17180379b2a3SViresh Kumar while ((cpsdvsr <= CPSDVR_MAX) && !found) { 17190379b2a3SViresh Kumar while (scr <= SCR_MAX) { 17200379b2a3SViresh Kumar tmp = spi_rate(rate, cpsdvsr, scr); 17210379b2a3SViresh Kumar 17225eb806a3SViresh Kumar if (tmp > freq) { 17235eb806a3SViresh Kumar /* we need lower freq */ 17240379b2a3SViresh Kumar scr++; 17255eb806a3SViresh Kumar continue; 17265eb806a3SViresh Kumar } 17275eb806a3SViresh Kumar 17280379b2a3SViresh Kumar /* 17295eb806a3SViresh Kumar * If found exact value, mark found and break. 17305eb806a3SViresh Kumar * If found more closer value, update and break. 17310379b2a3SViresh Kumar */ 17325eb806a3SViresh Kumar if (tmp > best_freq) { 17330379b2a3SViresh Kumar best_freq = tmp; 17340379b2a3SViresh Kumar best_cpsdvsr = cpsdvsr; 17350379b2a3SViresh Kumar best_scr = scr; 17360379b2a3SViresh Kumar 17370379b2a3SViresh Kumar if (tmp == freq) 17385eb806a3SViresh Kumar found = 1; 17390379b2a3SViresh Kumar } 17405eb806a3SViresh Kumar /* 17415eb806a3SViresh Kumar * increased scr will give lower rates, which are not 17425eb806a3SViresh Kumar * required 17435eb806a3SViresh Kumar */ 17445eb806a3SViresh Kumar break; 17450379b2a3SViresh Kumar } 17460379b2a3SViresh Kumar cpsdvsr += 2; 17470379b2a3SViresh Kumar scr = SCR_MIN; 1748ca632f55SGrant Likely } 1749ca632f55SGrant Likely 17505eb806a3SViresh Kumar WARN(!best_freq, "pl022: Matching cpsdvsr and scr not found for %d Hz rate \n", 17515eb806a3SViresh Kumar freq); 17525eb806a3SViresh Kumar 17530379b2a3SViresh Kumar clk_freq->cpsdvsr = (u8) (best_cpsdvsr & 0xFF); 17540379b2a3SViresh Kumar clk_freq->scr = (u8) (best_scr & 0xFF); 17550379b2a3SViresh Kumar dev_dbg(&pl022->adev->dev, 17560379b2a3SViresh Kumar "SSP Target Frequency is: %u, Effective Frequency is %u\n", 17570379b2a3SViresh Kumar freq, best_freq); 17580379b2a3SViresh Kumar dev_dbg(&pl022->adev->dev, "SSP cpsdvsr = %d, scr = %d\n", 17590379b2a3SViresh Kumar clk_freq->cpsdvsr, clk_freq->scr); 17600379b2a3SViresh Kumar 1761ca632f55SGrant Likely return 0; 1762ca632f55SGrant Likely } 1763ca632f55SGrant Likely 1764ca632f55SGrant Likely /* 1765ca632f55SGrant Likely * A piece of default chip info unless the platform 1766ca632f55SGrant Likely * supplies it. 1767ca632f55SGrant Likely */ 1768ca632f55SGrant Likely static const struct pl022_config_chip pl022_default_chip_info = { 1769ca632f55SGrant Likely .com_mode = POLLING_TRANSFER, 1770ca632f55SGrant Likely .iface = SSP_INTERFACE_MOTOROLA_SPI, 1771ca632f55SGrant Likely .hierarchy = SSP_SLAVE, 1772ca632f55SGrant Likely .slave_tx_disable = DO_NOT_DRIVE_TX, 1773ca632f55SGrant Likely .rx_lev_trig = SSP_RX_1_OR_MORE_ELEM, 1774ca632f55SGrant Likely .tx_lev_trig = SSP_TX_1_OR_MORE_EMPTY_LOC, 1775ca632f55SGrant Likely .ctrl_len = SSP_BITS_8, 1776ca632f55SGrant Likely .wait_state = SSP_MWIRE_WAIT_ZERO, 1777ca632f55SGrant Likely .duplex = SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, 1778ca632f55SGrant Likely .cs_control = null_cs_control, 1779ca632f55SGrant Likely }; 1780ca632f55SGrant Likely 1781ca632f55SGrant Likely /** 1782ca632f55SGrant Likely * pl022_setup - setup function registered to SPI master framework 1783ca632f55SGrant Likely * @spi: spi device which is requesting setup 1784ca632f55SGrant Likely * 1785ca632f55SGrant Likely * This function is registered to the SPI framework for this SPI master 1786ca632f55SGrant Likely * controller. If it is the first time when setup is called by this device, 1787ca632f55SGrant Likely * this function will initialize the runtime state for this chip and save 1788ca632f55SGrant Likely * the same in the device structure. Else it will update the runtime info 1789ca632f55SGrant Likely * with the updated chip info. Nothing is really being written to the 1790ca632f55SGrant Likely * controller hardware here, that is not done until the actual transfer 1791ca632f55SGrant Likely * commence. 1792ca632f55SGrant Likely */ 1793ca632f55SGrant Likely static int pl022_setup(struct spi_device *spi) 1794ca632f55SGrant Likely { 1795ca632f55SGrant Likely struct pl022_config_chip const *chip_info; 17966d3952a7SRoland Stigge struct pl022_config_chip chip_info_dt; 1797ca632f55SGrant Likely struct chip_data *chip; 1798c4a47843SJonas Aaberg struct ssp_clock_params clk_freq = { .cpsdvsr = 0, .scr = 0}; 1799ca632f55SGrant Likely int status = 0; 1800ca632f55SGrant Likely struct pl022 *pl022 = spi_master_get_devdata(spi->master); 1801ca632f55SGrant Likely unsigned int bits = spi->bits_per_word; 1802ca632f55SGrant Likely u32 tmp; 18036d3952a7SRoland Stigge struct device_node *np = spi->dev.of_node; 1804ca632f55SGrant Likely 1805ca632f55SGrant Likely if (!spi->max_speed_hz) 1806ca632f55SGrant Likely return -EINVAL; 1807ca632f55SGrant Likely 1808ca632f55SGrant Likely /* Get controller_state if one is supplied */ 1809ca632f55SGrant Likely chip = spi_get_ctldata(spi); 1810ca632f55SGrant Likely 1811ca632f55SGrant Likely if (chip == NULL) { 1812ca632f55SGrant Likely chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); 1813ca632f55SGrant Likely if (!chip) { 1814ca632f55SGrant Likely dev_err(&spi->dev, 1815ca632f55SGrant Likely "cannot allocate controller state\n"); 1816ca632f55SGrant Likely return -ENOMEM; 1817ca632f55SGrant Likely } 1818ca632f55SGrant Likely dev_dbg(&spi->dev, 1819ca632f55SGrant Likely "allocated memory for controller's runtime state\n"); 1820ca632f55SGrant Likely } 1821ca632f55SGrant Likely 1822ca632f55SGrant Likely /* Get controller data if one is supplied */ 1823ca632f55SGrant Likely chip_info = spi->controller_data; 1824ca632f55SGrant Likely 1825ca632f55SGrant Likely if (chip_info == NULL) { 18266d3952a7SRoland Stigge if (np) { 18276d3952a7SRoland Stigge chip_info_dt = pl022_default_chip_info; 18286d3952a7SRoland Stigge 18296d3952a7SRoland Stigge chip_info_dt.hierarchy = SSP_MASTER; 18306d3952a7SRoland Stigge of_property_read_u32(np, "pl022,interface", 18316d3952a7SRoland Stigge &chip_info_dt.iface); 18326d3952a7SRoland Stigge of_property_read_u32(np, "pl022,com-mode", 18336d3952a7SRoland Stigge &chip_info_dt.com_mode); 18346d3952a7SRoland Stigge of_property_read_u32(np, "pl022,rx-level-trig", 18356d3952a7SRoland Stigge &chip_info_dt.rx_lev_trig); 18366d3952a7SRoland Stigge of_property_read_u32(np, "pl022,tx-level-trig", 18376d3952a7SRoland Stigge &chip_info_dt.tx_lev_trig); 18386d3952a7SRoland Stigge of_property_read_u32(np, "pl022,ctrl-len", 18396d3952a7SRoland Stigge &chip_info_dt.ctrl_len); 18406d3952a7SRoland Stigge of_property_read_u32(np, "pl022,wait-state", 18416d3952a7SRoland Stigge &chip_info_dt.wait_state); 18426d3952a7SRoland Stigge of_property_read_u32(np, "pl022,duplex", 18436d3952a7SRoland Stigge &chip_info_dt.duplex); 18446d3952a7SRoland Stigge 18456d3952a7SRoland Stigge chip_info = &chip_info_dt; 18466d3952a7SRoland Stigge } else { 1847ca632f55SGrant Likely chip_info = &pl022_default_chip_info; 1848ca632f55SGrant Likely /* spi_board_info.controller_data not is supplied */ 1849ca632f55SGrant Likely dev_dbg(&spi->dev, 1850ca632f55SGrant Likely "using default controller_data settings\n"); 18516d3952a7SRoland Stigge } 1852ca632f55SGrant Likely } else 1853ca632f55SGrant Likely dev_dbg(&spi->dev, 1854ca632f55SGrant Likely "using user supplied controller_data settings\n"); 1855ca632f55SGrant Likely 1856ca632f55SGrant Likely /* 1857ca632f55SGrant Likely * We can override with custom divisors, else we use the board 1858ca632f55SGrant Likely * frequency setting 1859ca632f55SGrant Likely */ 1860ca632f55SGrant Likely if ((0 == chip_info->clk_freq.cpsdvsr) 1861ca632f55SGrant Likely && (0 == chip_info->clk_freq.scr)) { 1862ca632f55SGrant Likely status = calculate_effective_freq(pl022, 1863ca632f55SGrant Likely spi->max_speed_hz, 1864ca632f55SGrant Likely &clk_freq); 1865ca632f55SGrant Likely if (status < 0) 1866ca632f55SGrant Likely goto err_config_params; 1867ca632f55SGrant Likely } else { 1868ca632f55SGrant Likely memcpy(&clk_freq, &chip_info->clk_freq, sizeof(clk_freq)); 1869ca632f55SGrant Likely if ((clk_freq.cpsdvsr % 2) != 0) 1870ca632f55SGrant Likely clk_freq.cpsdvsr = 1871ca632f55SGrant Likely clk_freq.cpsdvsr - 1; 1872ca632f55SGrant Likely } 1873ca632f55SGrant Likely if ((clk_freq.cpsdvsr < CPSDVR_MIN) 1874ca632f55SGrant Likely || (clk_freq.cpsdvsr > CPSDVR_MAX)) { 1875f8db4cc4SGrant Likely status = -EINVAL; 1876ca632f55SGrant Likely dev_err(&spi->dev, 1877ca632f55SGrant Likely "cpsdvsr is configured incorrectly\n"); 1878ca632f55SGrant Likely goto err_config_params; 1879ca632f55SGrant Likely } 1880ca632f55SGrant Likely 1881ca632f55SGrant Likely status = verify_controller_parameters(pl022, chip_info); 1882ca632f55SGrant Likely if (status) { 1883ca632f55SGrant Likely dev_err(&spi->dev, "controller data is incorrect"); 1884ca632f55SGrant Likely goto err_config_params; 1885ca632f55SGrant Likely } 1886ca632f55SGrant Likely 1887083be3f0SLinus Walleij pl022->rx_lev_trig = chip_info->rx_lev_trig; 1888083be3f0SLinus Walleij pl022->tx_lev_trig = chip_info->tx_lev_trig; 1889083be3f0SLinus Walleij 1890ca632f55SGrant Likely /* Now set controller state based on controller data */ 1891ca632f55SGrant Likely chip->xfer_type = chip_info->com_mode; 1892ca632f55SGrant Likely if (!chip_info->cs_control) { 1893ca632f55SGrant Likely chip->cs_control = null_cs_control; 1894f6f46de1SRoland Stigge if (!gpio_is_valid(pl022->chipselects[spi->chip_select])) 1895ca632f55SGrant Likely dev_warn(&spi->dev, 1896f6f46de1SRoland Stigge "invalid chip select\n"); 1897ca632f55SGrant Likely } else 1898ca632f55SGrant Likely chip->cs_control = chip_info->cs_control; 1899ca632f55SGrant Likely 1900eb798c64SVinit Shenoy /* Check bits per word with vendor specific range */ 1901eb798c64SVinit Shenoy if ((bits <= 3) || (bits > pl022->vendor->max_bpw)) { 1902ca632f55SGrant Likely status = -ENOTSUPP; 1903eb798c64SVinit Shenoy dev_err(&spi->dev, "illegal data size for this controller!\n"); 1904eb798c64SVinit Shenoy dev_err(&spi->dev, "This controller can only handle 4 <= n <= %d bit words\n", 1905eb798c64SVinit Shenoy pl022->vendor->max_bpw); 1906ca632f55SGrant Likely goto err_config_params; 1907ca632f55SGrant Likely } else if (bits <= 8) { 1908ca632f55SGrant Likely dev_dbg(&spi->dev, "4 <= n <=8 bits per word\n"); 1909ca632f55SGrant Likely chip->n_bytes = 1; 1910ca632f55SGrant Likely chip->read = READING_U8; 1911ca632f55SGrant Likely chip->write = WRITING_U8; 1912ca632f55SGrant Likely } else if (bits <= 16) { 1913ca632f55SGrant Likely dev_dbg(&spi->dev, "9 <= n <= 16 bits per word\n"); 1914ca632f55SGrant Likely chip->n_bytes = 2; 1915ca632f55SGrant Likely chip->read = READING_U16; 1916ca632f55SGrant Likely chip->write = WRITING_U16; 1917ca632f55SGrant Likely } else { 1918ca632f55SGrant Likely dev_dbg(&spi->dev, "17 <= n <= 32 bits per word\n"); 1919ca632f55SGrant Likely chip->n_bytes = 4; 1920ca632f55SGrant Likely chip->read = READING_U32; 1921ca632f55SGrant Likely chip->write = WRITING_U32; 1922ca632f55SGrant Likely } 1923ca632f55SGrant Likely 1924ca632f55SGrant Likely /* Now Initialize all register settings required for this chip */ 1925ca632f55SGrant Likely chip->cr0 = 0; 1926ca632f55SGrant Likely chip->cr1 = 0; 1927ca632f55SGrant Likely chip->dmacr = 0; 1928ca632f55SGrant Likely chip->cpsr = 0; 1929ca632f55SGrant Likely if ((chip_info->com_mode == DMA_TRANSFER) 1930ca632f55SGrant Likely && ((pl022->master_info)->enable_dma)) { 1931ca632f55SGrant Likely chip->enable_dma = true; 1932ca632f55SGrant Likely dev_dbg(&spi->dev, "DMA mode set in controller state\n"); 1933ca632f55SGrant Likely SSP_WRITE_BITS(chip->dmacr, SSP_DMA_ENABLED, 1934ca632f55SGrant Likely SSP_DMACR_MASK_RXDMAE, 0); 1935ca632f55SGrant Likely SSP_WRITE_BITS(chip->dmacr, SSP_DMA_ENABLED, 1936ca632f55SGrant Likely SSP_DMACR_MASK_TXDMAE, 1); 1937ca632f55SGrant Likely } else { 1938ca632f55SGrant Likely chip->enable_dma = false; 1939ca632f55SGrant Likely dev_dbg(&spi->dev, "DMA mode NOT set in controller state\n"); 1940ca632f55SGrant Likely SSP_WRITE_BITS(chip->dmacr, SSP_DMA_DISABLED, 1941ca632f55SGrant Likely SSP_DMACR_MASK_RXDMAE, 0); 1942ca632f55SGrant Likely SSP_WRITE_BITS(chip->dmacr, SSP_DMA_DISABLED, 1943ca632f55SGrant Likely SSP_DMACR_MASK_TXDMAE, 1); 1944ca632f55SGrant Likely } 1945ca632f55SGrant Likely 1946ca632f55SGrant Likely chip->cpsr = clk_freq.cpsdvsr; 1947ca632f55SGrant Likely 1948ca632f55SGrant Likely /* Special setup for the ST micro extended control registers */ 1949ca632f55SGrant Likely if (pl022->vendor->extended_cr) { 1950ca632f55SGrant Likely u32 etx; 1951ca632f55SGrant Likely 1952ca632f55SGrant Likely if (pl022->vendor->pl023) { 1953ca632f55SGrant Likely /* These bits are only in the PL023 */ 1954ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr1, chip_info->clkdelay, 1955ca632f55SGrant Likely SSP_CR1_MASK_FBCLKDEL_ST, 13); 1956ca632f55SGrant Likely } else { 1957ca632f55SGrant Likely /* These bits are in the PL022 but not PL023 */ 1958ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr0, chip_info->duplex, 1959ca632f55SGrant Likely SSP_CR0_MASK_HALFDUP_ST, 5); 1960ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr0, chip_info->ctrl_len, 1961ca632f55SGrant Likely SSP_CR0_MASK_CSS_ST, 16); 1962ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr0, chip_info->iface, 1963ca632f55SGrant Likely SSP_CR0_MASK_FRF_ST, 21); 1964ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr1, chip_info->wait_state, 1965ca632f55SGrant Likely SSP_CR1_MASK_MWAIT_ST, 6); 1966ca632f55SGrant Likely } 1967ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr0, bits - 1, 1968ca632f55SGrant Likely SSP_CR0_MASK_DSS_ST, 0); 1969ca632f55SGrant Likely 1970ca632f55SGrant Likely if (spi->mode & SPI_LSB_FIRST) { 1971ca632f55SGrant Likely tmp = SSP_RX_LSB; 1972ca632f55SGrant Likely etx = SSP_TX_LSB; 1973ca632f55SGrant Likely } else { 1974ca632f55SGrant Likely tmp = SSP_RX_MSB; 1975ca632f55SGrant Likely etx = SSP_TX_MSB; 1976ca632f55SGrant Likely } 1977ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr1, tmp, SSP_CR1_MASK_RENDN_ST, 4); 1978ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr1, etx, SSP_CR1_MASK_TENDN_ST, 5); 1979ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr1, chip_info->rx_lev_trig, 1980ca632f55SGrant Likely SSP_CR1_MASK_RXIFLSEL_ST, 7); 1981ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr1, chip_info->tx_lev_trig, 1982ca632f55SGrant Likely SSP_CR1_MASK_TXIFLSEL_ST, 10); 1983ca632f55SGrant Likely } else { 1984ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr0, bits - 1, 1985ca632f55SGrant Likely SSP_CR0_MASK_DSS, 0); 1986ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr0, chip_info->iface, 1987ca632f55SGrant Likely SSP_CR0_MASK_FRF, 4); 1988ca632f55SGrant Likely } 1989ca632f55SGrant Likely 1990ca632f55SGrant Likely /* Stuff that is common for all versions */ 1991ca632f55SGrant Likely if (spi->mode & SPI_CPOL) 1992ca632f55SGrant Likely tmp = SSP_CLK_POL_IDLE_HIGH; 1993ca632f55SGrant Likely else 1994ca632f55SGrant Likely tmp = SSP_CLK_POL_IDLE_LOW; 1995ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr0, tmp, SSP_CR0_MASK_SPO, 6); 1996ca632f55SGrant Likely 1997ca632f55SGrant Likely if (spi->mode & SPI_CPHA) 1998ca632f55SGrant Likely tmp = SSP_CLK_SECOND_EDGE; 1999ca632f55SGrant Likely else 2000ca632f55SGrant Likely tmp = SSP_CLK_FIRST_EDGE; 2001ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr0, tmp, SSP_CR0_MASK_SPH, 7); 2002ca632f55SGrant Likely 2003ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr0, clk_freq.scr, SSP_CR0_MASK_SCR, 8); 2004ca632f55SGrant Likely /* Loopback is available on all versions except PL023 */ 2005ca632f55SGrant Likely if (pl022->vendor->loopback) { 2006ca632f55SGrant Likely if (spi->mode & SPI_LOOP) 2007ca632f55SGrant Likely tmp = LOOPBACK_ENABLED; 2008ca632f55SGrant Likely else 2009ca632f55SGrant Likely tmp = LOOPBACK_DISABLED; 2010ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr1, tmp, SSP_CR1_MASK_LBM, 0); 2011ca632f55SGrant Likely } 2012ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr1, SSP_DISABLED, SSP_CR1_MASK_SSE, 1); 2013ca632f55SGrant Likely SSP_WRITE_BITS(chip->cr1, chip_info->hierarchy, SSP_CR1_MASK_MS, 2); 2014f1e45f86SViresh Kumar SSP_WRITE_BITS(chip->cr1, chip_info->slave_tx_disable, SSP_CR1_MASK_SOD, 2015f1e45f86SViresh Kumar 3); 2016ca632f55SGrant Likely 2017ca632f55SGrant Likely /* Save controller_state */ 2018ca632f55SGrant Likely spi_set_ctldata(spi, chip); 2019ca632f55SGrant Likely return status; 2020ca632f55SGrant Likely err_config_params: 2021ca632f55SGrant Likely spi_set_ctldata(spi, NULL); 2022ca632f55SGrant Likely kfree(chip); 2023ca632f55SGrant Likely return status; 2024ca632f55SGrant Likely } 2025ca632f55SGrant Likely 2026ca632f55SGrant Likely /** 2027ca632f55SGrant Likely * pl022_cleanup - cleanup function registered to SPI master framework 2028ca632f55SGrant Likely * @spi: spi device which is requesting cleanup 2029ca632f55SGrant Likely * 2030ca632f55SGrant Likely * This function is registered to the SPI framework for this SPI master 2031ca632f55SGrant Likely * controller. It will free the runtime state of chip. 2032ca632f55SGrant Likely */ 2033ca632f55SGrant Likely static void pl022_cleanup(struct spi_device *spi) 2034ca632f55SGrant Likely { 2035ca632f55SGrant Likely struct chip_data *chip = spi_get_ctldata(spi); 2036ca632f55SGrant Likely 2037ca632f55SGrant Likely spi_set_ctldata(spi, NULL); 2038ca632f55SGrant Likely kfree(chip); 2039ca632f55SGrant Likely } 2040ca632f55SGrant Likely 204139a6ac11SRoland Stigge static struct pl022_ssp_controller * 204239a6ac11SRoland Stigge pl022_platform_data_dt_get(struct device *dev) 204339a6ac11SRoland Stigge { 204439a6ac11SRoland Stigge struct device_node *np = dev->of_node; 204539a6ac11SRoland Stigge struct pl022_ssp_controller *pd; 204639a6ac11SRoland Stigge u32 tmp; 204739a6ac11SRoland Stigge 204839a6ac11SRoland Stigge if (!np) { 204939a6ac11SRoland Stigge dev_err(dev, "no dt node defined\n"); 205039a6ac11SRoland Stigge return NULL; 205139a6ac11SRoland Stigge } 205239a6ac11SRoland Stigge 205339a6ac11SRoland Stigge pd = devm_kzalloc(dev, sizeof(struct pl022_ssp_controller), GFP_KERNEL); 205439a6ac11SRoland Stigge if (!pd) { 205539a6ac11SRoland Stigge dev_err(dev, "cannot allocate platform data memory\n"); 205639a6ac11SRoland Stigge return NULL; 205739a6ac11SRoland Stigge } 205839a6ac11SRoland Stigge 205939a6ac11SRoland Stigge pd->bus_id = -1; 2060dbd897b9SLinus Walleij pd->enable_dma = 1; 206139a6ac11SRoland Stigge of_property_read_u32(np, "num-cs", &tmp); 206239a6ac11SRoland Stigge pd->num_chipselect = tmp; 206339a6ac11SRoland Stigge of_property_read_u32(np, "pl022,autosuspend-delay", 206439a6ac11SRoland Stigge &pd->autosuspend_delay); 206539a6ac11SRoland Stigge pd->rt = of_property_read_bool(np, "pl022,rt"); 206639a6ac11SRoland Stigge 206739a6ac11SRoland Stigge return pd; 206839a6ac11SRoland Stigge } 206939a6ac11SRoland Stigge 2070fd4a319bSGrant Likely static int pl022_probe(struct amba_device *adev, const struct amba_id *id) 2071ca632f55SGrant Likely { 2072ca632f55SGrant Likely struct device *dev = &adev->dev; 20738074cf06SJingoo Han struct pl022_ssp_controller *platform_info = 20748074cf06SJingoo Han dev_get_platdata(&adev->dev); 2075ca632f55SGrant Likely struct spi_master *master; 2076ca632f55SGrant Likely struct pl022 *pl022 = NULL; /*Data for this driver */ 20776d3952a7SRoland Stigge struct device_node *np = adev->dev.of_node; 20786d3952a7SRoland Stigge int status = 0, i, num_cs; 2079ca632f55SGrant Likely 2080ca632f55SGrant Likely dev_info(&adev->dev, 2081ca632f55SGrant Likely "ARM PL022 driver, device ID: 0x%08x\n", adev->periphid); 208239a6ac11SRoland Stigge if (!platform_info && IS_ENABLED(CONFIG_OF)) 208339a6ac11SRoland Stigge platform_info = pl022_platform_data_dt_get(dev); 208439a6ac11SRoland Stigge 208539a6ac11SRoland Stigge if (!platform_info) { 208639a6ac11SRoland Stigge dev_err(dev, "probe: no platform data defined\n"); 2087aeef9915SLinus Walleij return -ENODEV; 2088ca632f55SGrant Likely } 2089ca632f55SGrant Likely 20906d3952a7SRoland Stigge if (platform_info->num_chipselect) { 20916d3952a7SRoland Stigge num_cs = platform_info->num_chipselect; 20926d3952a7SRoland Stigge } else { 209339a6ac11SRoland Stigge dev_err(dev, "probe: no chip select defined\n"); 2094aeef9915SLinus Walleij return -ENODEV; 20956d3952a7SRoland Stigge } 20966d3952a7SRoland Stigge 2097ca632f55SGrant Likely /* Allocate master with space for data */ 2098b4b84826SRoland Stigge master = spi_alloc_master(dev, sizeof(struct pl022)); 2099ca632f55SGrant Likely if (master == NULL) { 2100ca632f55SGrant Likely dev_err(&adev->dev, "probe - cannot alloc SPI master\n"); 2101aeef9915SLinus Walleij return -ENOMEM; 2102ca632f55SGrant Likely } 2103ca632f55SGrant Likely 2104ca632f55SGrant Likely pl022 = spi_master_get_devdata(master); 2105ca632f55SGrant Likely pl022->master = master; 2106ca632f55SGrant Likely pl022->master_info = platform_info; 2107ca632f55SGrant Likely pl022->adev = adev; 2108ca632f55SGrant Likely pl022->vendor = id->data; 2109b4b84826SRoland Stigge pl022->chipselects = devm_kzalloc(dev, num_cs * sizeof(int), 2110b4b84826SRoland Stigge GFP_KERNEL); 2111ca632f55SGrant Likely 2112f1c9cf07SLinus Walleij pinctrl_pm_select_default_state(dev); 21134f5e1b37SPatrice Chotard 2114ca632f55SGrant Likely /* 2115ca632f55SGrant Likely * Bus Number Which has been Assigned to this SSP controller 2116ca632f55SGrant Likely * on this board 2117ca632f55SGrant Likely */ 2118ca632f55SGrant Likely master->bus_num = platform_info->bus_id; 21196d3952a7SRoland Stigge master->num_chipselect = num_cs; 2120ca632f55SGrant Likely master->cleanup = pl022_cleanup; 2121ca632f55SGrant Likely master->setup = pl022_setup; 212229b6e906SMark Brown master->auto_runtime_pm = true; 2123ffbbdd21SLinus Walleij master->transfer_one_message = pl022_transfer_one_message; 2124ffbbdd21SLinus Walleij master->unprepare_transfer_hardware = pl022_unprepare_transfer_hardware; 2125ffbbdd21SLinus Walleij master->rt = platform_info->rt; 21266d3952a7SRoland Stigge master->dev.of_node = dev->of_node; 2127ca632f55SGrant Likely 21286d3952a7SRoland Stigge if (platform_info->num_chipselect && platform_info->chipselects) { 21296d3952a7SRoland Stigge for (i = 0; i < num_cs; i++) 2130f6f46de1SRoland Stigge pl022->chipselects[i] = platform_info->chipselects[i]; 21316d3952a7SRoland Stigge } else if (IS_ENABLED(CONFIG_OF)) { 21326d3952a7SRoland Stigge for (i = 0; i < num_cs; i++) { 21336d3952a7SRoland Stigge int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); 21346d3952a7SRoland Stigge 21356d3952a7SRoland Stigge if (cs_gpio == -EPROBE_DEFER) { 21366d3952a7SRoland Stigge status = -EPROBE_DEFER; 21376d3952a7SRoland Stigge goto err_no_gpio; 21386d3952a7SRoland Stigge } 21396d3952a7SRoland Stigge 21406d3952a7SRoland Stigge pl022->chipselects[i] = cs_gpio; 21416d3952a7SRoland Stigge 21426d3952a7SRoland Stigge if (gpio_is_valid(cs_gpio)) { 2143aeef9915SLinus Walleij if (devm_gpio_request(dev, cs_gpio, "ssp-pl022")) 21446d3952a7SRoland Stigge dev_err(&adev->dev, 21456d3952a7SRoland Stigge "could not request %d gpio\n", 21466d3952a7SRoland Stigge cs_gpio); 21476d3952a7SRoland Stigge else if (gpio_direction_output(cs_gpio, 1)) 21486d3952a7SRoland Stigge dev_err(&adev->dev, 21496d3952a7SRoland Stigge "could set gpio %d as output\n", 21506d3952a7SRoland Stigge cs_gpio); 21516d3952a7SRoland Stigge } 21526d3952a7SRoland Stigge } 21536d3952a7SRoland Stigge } 2154f6f46de1SRoland Stigge 2155ca632f55SGrant Likely /* 2156ca632f55SGrant Likely * Supports mode 0-3, loopback, and active low CS. Transfers are 2157ca632f55SGrant Likely * always MS bit first on the original pl022. 2158ca632f55SGrant Likely */ 2159ca632f55SGrant Likely master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP; 2160ca632f55SGrant Likely if (pl022->vendor->extended_cr) 2161ca632f55SGrant Likely master->mode_bits |= SPI_LSB_FIRST; 2162ca632f55SGrant Likely 2163ca632f55SGrant Likely dev_dbg(&adev->dev, "BUSNO: %d\n", master->bus_num); 2164ca632f55SGrant Likely 2165ca632f55SGrant Likely status = amba_request_regions(adev, NULL); 2166ca632f55SGrant Likely if (status) 2167ca632f55SGrant Likely goto err_no_ioregion; 2168ca632f55SGrant Likely 2169ca632f55SGrant Likely pl022->phybase = adev->res.start; 2170aeef9915SLinus Walleij pl022->virtbase = devm_ioremap(dev, adev->res.start, 2171aeef9915SLinus Walleij resource_size(&adev->res)); 2172ca632f55SGrant Likely if (pl022->virtbase == NULL) { 2173ca632f55SGrant Likely status = -ENOMEM; 2174ca632f55SGrant Likely goto err_no_ioremap; 2175ca632f55SGrant Likely } 21767085f403SFabio Estevam printk(KERN_INFO "pl022: mapped registers from %pa to %p\n", 21777085f403SFabio Estevam &adev->res.start, pl022->virtbase); 2178ca632f55SGrant Likely 2179aeef9915SLinus Walleij pl022->clk = devm_clk_get(&adev->dev, NULL); 2180ca632f55SGrant Likely if (IS_ERR(pl022->clk)) { 2181ca632f55SGrant Likely status = PTR_ERR(pl022->clk); 2182ca632f55SGrant Likely dev_err(&adev->dev, "could not retrieve SSP/SPI bus clock\n"); 2183ca632f55SGrant Likely goto err_no_clk; 2184ca632f55SGrant Likely } 21857ff6bcf0SRussell King 21867ff6bcf0SRussell King status = clk_prepare(pl022->clk); 21877ff6bcf0SRussell King if (status) { 21887ff6bcf0SRussell King dev_err(&adev->dev, "could not prepare SSP/SPI bus clock\n"); 21897ff6bcf0SRussell King goto err_clk_prep; 21907ff6bcf0SRussell King } 21917ff6bcf0SRussell King 219271e63e74SUlf Hansson status = clk_enable(pl022->clk); 219371e63e74SUlf Hansson if (status) { 219471e63e74SUlf Hansson dev_err(&adev->dev, "could not enable SSP/SPI bus clock\n"); 219571e63e74SUlf Hansson goto err_no_clk_en; 219671e63e74SUlf Hansson } 219771e63e74SUlf Hansson 2198ffbbdd21SLinus Walleij /* Initialize transfer pump */ 2199ffbbdd21SLinus Walleij tasklet_init(&pl022->pump_transfers, pump_transfers, 2200ffbbdd21SLinus Walleij (unsigned long)pl022); 2201ffbbdd21SLinus Walleij 2202ca632f55SGrant Likely /* Disable SSP */ 2203ca632f55SGrant Likely writew((readw(SSP_CR1(pl022->virtbase)) & (~SSP_CR1_MASK_SSE)), 2204ca632f55SGrant Likely SSP_CR1(pl022->virtbase)); 2205ca632f55SGrant Likely load_ssp_default_config(pl022); 2206ca632f55SGrant Likely 2207aeef9915SLinus Walleij status = devm_request_irq(dev, adev->irq[0], pl022_interrupt_handler, 2208aeef9915SLinus Walleij 0, "pl022", pl022); 2209ca632f55SGrant Likely if (status < 0) { 2210ca632f55SGrant Likely dev_err(&adev->dev, "probe - cannot get IRQ (%d)\n", status); 2211ca632f55SGrant Likely goto err_no_irq; 2212ca632f55SGrant Likely } 2213ca632f55SGrant Likely 2214dc715452SArnd Bergmann /* Get DMA channels, try autoconfiguration first */ 2215dc715452SArnd Bergmann status = pl022_dma_autoprobe(pl022); 2216dc715452SArnd Bergmann 2217dc715452SArnd Bergmann /* If that failed, use channels from platform_info */ 2218dc715452SArnd Bergmann if (status == 0) 2219dc715452SArnd Bergmann platform_info->enable_dma = 1; 2220dc715452SArnd Bergmann else if (platform_info->enable_dma) { 2221ca632f55SGrant Likely status = pl022_dma_probe(pl022); 2222ca632f55SGrant Likely if (status != 0) 2223ca632f55SGrant Likely platform_info->enable_dma = 0; 2224ca632f55SGrant Likely } 2225ca632f55SGrant Likely 2226ca632f55SGrant Likely /* Register with the SPI framework */ 2227ca632f55SGrant Likely amba_set_drvdata(adev, pl022); 2228*35794a77SJingoo Han status = devm_spi_register_master(&adev->dev, master); 2229ca632f55SGrant Likely if (status != 0) { 2230ca632f55SGrant Likely dev_err(&adev->dev, 2231ca632f55SGrant Likely "probe - problem registering spi master\n"); 2232ca632f55SGrant Likely goto err_spi_register; 2233ca632f55SGrant Likely } 2234ca632f55SGrant Likely dev_dbg(dev, "probe succeeded\n"); 223592b97f0aSRussell King 223692b97f0aSRussell King /* let runtime pm put suspend */ 223753e4aceaSChris Blair if (platform_info->autosuspend_delay > 0) { 223853e4aceaSChris Blair dev_info(&adev->dev, 223953e4aceaSChris Blair "will use autosuspend for runtime pm, delay %dms\n", 224053e4aceaSChris Blair platform_info->autosuspend_delay); 224153e4aceaSChris Blair pm_runtime_set_autosuspend_delay(dev, 224253e4aceaSChris Blair platform_info->autosuspend_delay); 224353e4aceaSChris Blair pm_runtime_use_autosuspend(dev); 224453e4aceaSChris Blair } 22450df34994SUlf Hansson pm_runtime_put(dev); 22460df34994SUlf Hansson 2247ca632f55SGrant Likely return 0; 2248ca632f55SGrant Likely 2249ca632f55SGrant Likely err_spi_register: 22503e3ea716SViresh Kumar if (platform_info->enable_dma) 2251ca632f55SGrant Likely pl022_dma_remove(pl022); 2252ca632f55SGrant Likely err_no_irq: 225371e63e74SUlf Hansson clk_disable(pl022->clk); 225471e63e74SUlf Hansson err_no_clk_en: 22557ff6bcf0SRussell King clk_unprepare(pl022->clk); 22567ff6bcf0SRussell King err_clk_prep: 2257ca632f55SGrant Likely err_no_clk: 2258ca632f55SGrant Likely err_no_ioremap: 2259ca632f55SGrant Likely amba_release_regions(adev); 2260ca632f55SGrant Likely err_no_ioregion: 22616d3952a7SRoland Stigge err_no_gpio: 2262ca632f55SGrant Likely spi_master_put(master); 2263ca632f55SGrant Likely return status; 2264ca632f55SGrant Likely } 2265ca632f55SGrant Likely 2266fd4a319bSGrant Likely static int 2267ca632f55SGrant Likely pl022_remove(struct amba_device *adev) 2268ca632f55SGrant Likely { 2269ca632f55SGrant Likely struct pl022 *pl022 = amba_get_drvdata(adev); 227050658b66SLinus Walleij 2271ca632f55SGrant Likely if (!pl022) 2272ca632f55SGrant Likely return 0; 2273ca632f55SGrant Likely 227492b97f0aSRussell King /* 227592b97f0aSRussell King * undo pm_runtime_put() in probe. I assume that we're not 227692b97f0aSRussell King * accessing the primecell here. 227792b97f0aSRussell King */ 227892b97f0aSRussell King pm_runtime_get_noresume(&adev->dev); 227992b97f0aSRussell King 2280ca632f55SGrant Likely load_ssp_default_config(pl022); 22813e3ea716SViresh Kumar if (pl022->master_info->enable_dma) 2282ca632f55SGrant Likely pl022_dma_remove(pl022); 22833e3ea716SViresh Kumar 2284ca632f55SGrant Likely clk_disable(pl022->clk); 22857ff6bcf0SRussell King clk_unprepare(pl022->clk); 2286ca632f55SGrant Likely amba_release_regions(adev); 2287ca632f55SGrant Likely tasklet_disable(&pl022->pump_transfers); 2288ca632f55SGrant Likely return 0; 2289ca632f55SGrant Likely } 2290ca632f55SGrant Likely 2291ada7aec7SLinus Walleij #if defined(CONFIG_SUSPEND) || defined(CONFIG_PM_RUNTIME) 2292ada7aec7SLinus Walleij /* 2293ada7aec7SLinus Walleij * These two functions are used from both suspend/resume and 2294ada7aec7SLinus Walleij * the runtime counterparts to handle external resources like 2295ada7aec7SLinus Walleij * clocks, pins and regulators when going to sleep. 2296ada7aec7SLinus Walleij */ 2297d8f18420SPatrice Chotard static void pl022_suspend_resources(struct pl022 *pl022, bool runtime) 2298ada7aec7SLinus Walleij { 2299ada7aec7SLinus Walleij clk_disable(pl022->clk); 2300ada7aec7SLinus Walleij 2301f1c9cf07SLinus Walleij if (runtime) 2302f1c9cf07SLinus Walleij pinctrl_pm_select_idle_state(&pl022->adev->dev); 2303f1c9cf07SLinus Walleij else 2304f1c9cf07SLinus Walleij pinctrl_pm_select_sleep_state(&pl022->adev->dev); 2305ada7aec7SLinus Walleij } 2306ada7aec7SLinus Walleij 2307d8f18420SPatrice Chotard static void pl022_resume_resources(struct pl022 *pl022, bool runtime) 2308ada7aec7SLinus Walleij { 2309d8f18420SPatrice Chotard /* First go to the default state */ 2310f1c9cf07SLinus Walleij pinctrl_pm_select_default_state(&pl022->adev->dev); 2311f1c9cf07SLinus Walleij if (!runtime) 2312d8f18420SPatrice Chotard /* Then let's idle the pins until the next transfer happens */ 2313f1c9cf07SLinus Walleij pinctrl_pm_select_idle_state(&pl022->adev->dev); 2314d8f18420SPatrice Chotard 2315ada7aec7SLinus Walleij clk_enable(pl022->clk); 2316ada7aec7SLinus Walleij } 2317ada7aec7SLinus Walleij #endif 2318ada7aec7SLinus Walleij 231992b97f0aSRussell King #ifdef CONFIG_SUSPEND 23206cfa6279SPeter Hüwe static int pl022_suspend(struct device *dev) 2321ca632f55SGrant Likely { 232292b97f0aSRussell King struct pl022 *pl022 = dev_get_drvdata(dev); 2323ffbbdd21SLinus Walleij int ret; 2324ca632f55SGrant Likely 2325ffbbdd21SLinus Walleij ret = spi_master_suspend(pl022->master); 2326ffbbdd21SLinus Walleij if (ret) { 2327ffbbdd21SLinus Walleij dev_warn(dev, "cannot suspend master\n"); 2328ffbbdd21SLinus Walleij return ret; 2329ca632f55SGrant Likely } 23304964a26dSUlf Hansson 23314964a26dSUlf Hansson pm_runtime_get_sync(dev); 2332d8f18420SPatrice Chotard pl022_suspend_resources(pl022, false); 2333ca632f55SGrant Likely 23346cfa6279SPeter Hüwe dev_dbg(dev, "suspended\n"); 2335ca632f55SGrant Likely return 0; 2336ca632f55SGrant Likely } 2337ca632f55SGrant Likely 233892b97f0aSRussell King static int pl022_resume(struct device *dev) 2339ca632f55SGrant Likely { 234092b97f0aSRussell King struct pl022 *pl022 = dev_get_drvdata(dev); 2341ffbbdd21SLinus Walleij int ret; 2342ca632f55SGrant Likely 2343d8f18420SPatrice Chotard pl022_resume_resources(pl022, false); 23444964a26dSUlf Hansson pm_runtime_put(dev); 2345ada7aec7SLinus Walleij 2346ca632f55SGrant Likely /* Start the queue running */ 2347ffbbdd21SLinus Walleij ret = spi_master_resume(pl022->master); 2348ffbbdd21SLinus Walleij if (ret) 2349ffbbdd21SLinus Walleij dev_err(dev, "problem starting queue (%d)\n", ret); 2350ca632f55SGrant Likely else 235192b97f0aSRussell King dev_dbg(dev, "resumed\n"); 2352ca632f55SGrant Likely 2353ffbbdd21SLinus Walleij return ret; 2354ca632f55SGrant Likely } 2355ca632f55SGrant Likely #endif /* CONFIG_PM */ 2356ca632f55SGrant Likely 235792b97f0aSRussell King #ifdef CONFIG_PM_RUNTIME 235892b97f0aSRussell King static int pl022_runtime_suspend(struct device *dev) 235992b97f0aSRussell King { 236092b97f0aSRussell King struct pl022 *pl022 = dev_get_drvdata(dev); 236192b97f0aSRussell King 2362d8f18420SPatrice Chotard pl022_suspend_resources(pl022, true); 236392b97f0aSRussell King return 0; 236492b97f0aSRussell King } 236592b97f0aSRussell King 236692b97f0aSRussell King static int pl022_runtime_resume(struct device *dev) 236792b97f0aSRussell King { 236892b97f0aSRussell King struct pl022 *pl022 = dev_get_drvdata(dev); 23694f5e1b37SPatrice Chotard 2370d8f18420SPatrice Chotard pl022_resume_resources(pl022, true); 237192b97f0aSRussell King return 0; 237292b97f0aSRussell King } 237392b97f0aSRussell King #endif 237492b97f0aSRussell King 237592b97f0aSRussell King static const struct dev_pm_ops pl022_dev_pm_ops = { 237692b97f0aSRussell King SET_SYSTEM_SLEEP_PM_OPS(pl022_suspend, pl022_resume) 237792b97f0aSRussell King SET_RUNTIME_PM_OPS(pl022_runtime_suspend, pl022_runtime_resume, NULL) 237892b97f0aSRussell King }; 237992b97f0aSRussell King 2380ca632f55SGrant Likely static struct vendor_data vendor_arm = { 2381ca632f55SGrant Likely .fifodepth = 8, 2382ca632f55SGrant Likely .max_bpw = 16, 2383ca632f55SGrant Likely .unidir = false, 2384ca632f55SGrant Likely .extended_cr = false, 2385ca632f55SGrant Likely .pl023 = false, 2386ca632f55SGrant Likely .loopback = true, 2387ca632f55SGrant Likely }; 2388ca632f55SGrant Likely 2389ca632f55SGrant Likely static struct vendor_data vendor_st = { 2390ca632f55SGrant Likely .fifodepth = 32, 2391ca632f55SGrant Likely .max_bpw = 32, 2392ca632f55SGrant Likely .unidir = false, 2393ca632f55SGrant Likely .extended_cr = true, 2394ca632f55SGrant Likely .pl023 = false, 2395ca632f55SGrant Likely .loopback = true, 2396ca632f55SGrant Likely }; 2397ca632f55SGrant Likely 2398ca632f55SGrant Likely static struct vendor_data vendor_st_pl023 = { 2399ca632f55SGrant Likely .fifodepth = 32, 2400ca632f55SGrant Likely .max_bpw = 32, 2401ca632f55SGrant Likely .unidir = false, 2402ca632f55SGrant Likely .extended_cr = true, 2403ca632f55SGrant Likely .pl023 = true, 2404ca632f55SGrant Likely .loopback = false, 2405ca632f55SGrant Likely }; 2406ca632f55SGrant Likely 2407ca632f55SGrant Likely static struct amba_id pl022_ids[] = { 2408ca632f55SGrant Likely { 2409ca632f55SGrant Likely /* 2410ca632f55SGrant Likely * ARM PL022 variant, this has a 16bit wide 2411ca632f55SGrant Likely * and 8 locations deep TX/RX FIFO 2412ca632f55SGrant Likely */ 2413ca632f55SGrant Likely .id = 0x00041022, 2414ca632f55SGrant Likely .mask = 0x000fffff, 2415ca632f55SGrant Likely .data = &vendor_arm, 2416ca632f55SGrant Likely }, 2417ca632f55SGrant Likely { 2418ca632f55SGrant Likely /* 2419ca632f55SGrant Likely * ST Micro derivative, this has 32bit wide 2420ca632f55SGrant Likely * and 32 locations deep TX/RX FIFO 2421ca632f55SGrant Likely */ 2422ca632f55SGrant Likely .id = 0x01080022, 2423ca632f55SGrant Likely .mask = 0xffffffff, 2424ca632f55SGrant Likely .data = &vendor_st, 2425ca632f55SGrant Likely }, 2426ca632f55SGrant Likely { 2427ca632f55SGrant Likely /* 2428ca632f55SGrant Likely * ST-Ericsson derivative "PL023" (this is not 2429ca632f55SGrant Likely * an official ARM number), this is a PL022 SSP block 2430ca632f55SGrant Likely * stripped to SPI mode only, it has 32bit wide 2431ca632f55SGrant Likely * and 32 locations deep TX/RX FIFO but no extended 2432ca632f55SGrant Likely * CR0/CR1 register 2433ca632f55SGrant Likely */ 2434ca632f55SGrant Likely .id = 0x00080023, 2435ca632f55SGrant Likely .mask = 0xffffffff, 2436ca632f55SGrant Likely .data = &vendor_st_pl023, 2437ca632f55SGrant Likely }, 2438ca632f55SGrant Likely { 0, 0 }, 2439ca632f55SGrant Likely }; 2440ca632f55SGrant Likely 24417eeac71bSDave Martin MODULE_DEVICE_TABLE(amba, pl022_ids); 24427eeac71bSDave Martin 2443ca632f55SGrant Likely static struct amba_driver pl022_driver = { 2444ca632f55SGrant Likely .drv = { 2445ca632f55SGrant Likely .name = "ssp-pl022", 244692b97f0aSRussell King .pm = &pl022_dev_pm_ops, 2447ca632f55SGrant Likely }, 2448ca632f55SGrant Likely .id_table = pl022_ids, 2449ca632f55SGrant Likely .probe = pl022_probe, 2450fd4a319bSGrant Likely .remove = pl022_remove, 2451ca632f55SGrant Likely }; 2452ca632f55SGrant Likely 2453ca632f55SGrant Likely static int __init pl022_init(void) 2454ca632f55SGrant Likely { 2455ca632f55SGrant Likely return amba_driver_register(&pl022_driver); 2456ca632f55SGrant Likely } 2457ca632f55SGrant Likely subsys_initcall(pl022_init); 2458ca632f55SGrant Likely 2459ca632f55SGrant Likely static void __exit pl022_exit(void) 2460ca632f55SGrant Likely { 2461ca632f55SGrant Likely amba_driver_unregister(&pl022_driver); 2462ca632f55SGrant Likely } 2463ca632f55SGrant Likely module_exit(pl022_exit); 2464ca632f55SGrant Likely 2465ca632f55SGrant Likely MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); 2466ca632f55SGrant Likely MODULE_DESCRIPTION("PL022 SSP Controller Driver"); 2467ca632f55SGrant Likely MODULE_LICENSE("GPL"); 2468