1ab4382d2SGreg Kroah-Hartman /* 2f890cef2SUwe Kleine-König * Driver for Motorola/Freescale IMX serial ports 3ab4382d2SGreg Kroah-Hartman * 4ab4382d2SGreg Kroah-Hartman * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 5ab4382d2SGreg Kroah-Hartman * 6ab4382d2SGreg Kroah-Hartman * Author: Sascha Hauer <sascha@saschahauer.de> 7ab4382d2SGreg Kroah-Hartman * Copyright (C) 2004 Pengutronix 8ab4382d2SGreg Kroah-Hartman * 9ab4382d2SGreg Kroah-Hartman * This program is free software; you can redistribute it and/or modify 10ab4382d2SGreg Kroah-Hartman * it under the terms of the GNU General Public License as published by 11ab4382d2SGreg Kroah-Hartman * the Free Software Foundation; either version 2 of the License, or 12ab4382d2SGreg Kroah-Hartman * (at your option) any later version. 13ab4382d2SGreg Kroah-Hartman * 14ab4382d2SGreg Kroah-Hartman * This program is distributed in the hope that it will be useful, 15ab4382d2SGreg Kroah-Hartman * but WITHOUT ANY WARRANTY; without even the implied warranty of 16ab4382d2SGreg Kroah-Hartman * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17ab4382d2SGreg Kroah-Hartman * GNU General Public License for more details. 18ab4382d2SGreg Kroah-Hartman */ 19ab4382d2SGreg Kroah-Hartman 20ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) 21ab4382d2SGreg Kroah-Hartman #define SUPPORT_SYSRQ 22ab4382d2SGreg Kroah-Hartman #endif 23ab4382d2SGreg Kroah-Hartman 24ab4382d2SGreg Kroah-Hartman #include <linux/module.h> 25ab4382d2SGreg Kroah-Hartman #include <linux/ioport.h> 26ab4382d2SGreg Kroah-Hartman #include <linux/init.h> 27ab4382d2SGreg Kroah-Hartman #include <linux/console.h> 28ab4382d2SGreg Kroah-Hartman #include <linux/sysrq.h> 29ab4382d2SGreg Kroah-Hartman #include <linux/platform_device.h> 30ab4382d2SGreg Kroah-Hartman #include <linux/tty.h> 31ab4382d2SGreg Kroah-Hartman #include <linux/tty_flip.h> 32ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 33ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> 34ab4382d2SGreg Kroah-Hartman #include <linux/clk.h> 35ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 36ab4382d2SGreg Kroah-Hartman #include <linux/rational.h> 37ab4382d2SGreg Kroah-Hartman #include <linux/slab.h> 3822698aa2SShawn Guo #include <linux/of.h> 3922698aa2SShawn Guo #include <linux/of_device.h> 40e32a9f8fSSachin Kamat #include <linux/io.h> 41b4cdc8f6SHuang Shijie #include <linux/dma-mapping.h> 42ab4382d2SGreg Kroah-Hartman 43ab4382d2SGreg Kroah-Hartman #include <asm/irq.h> 4482906b13SArnd Bergmann #include <linux/platform_data/serial-imx.h> 45b4cdc8f6SHuang Shijie #include <linux/platform_data/dma-imx.h> 46ab4382d2SGreg Kroah-Hartman 47ab4382d2SGreg Kroah-Hartman /* Register definitions */ 48ab4382d2SGreg Kroah-Hartman #define URXD0 0x0 /* Receiver Register */ 49ab4382d2SGreg Kroah-Hartman #define URTX0 0x40 /* Transmitter Register */ 50ab4382d2SGreg Kroah-Hartman #define UCR1 0x80 /* Control Register 1 */ 51ab4382d2SGreg Kroah-Hartman #define UCR2 0x84 /* Control Register 2 */ 52ab4382d2SGreg Kroah-Hartman #define UCR3 0x88 /* Control Register 3 */ 53ab4382d2SGreg Kroah-Hartman #define UCR4 0x8c /* Control Register 4 */ 54ab4382d2SGreg Kroah-Hartman #define UFCR 0x90 /* FIFO Control Register */ 55ab4382d2SGreg Kroah-Hartman #define USR1 0x94 /* Status Register 1 */ 56ab4382d2SGreg Kroah-Hartman #define USR2 0x98 /* Status Register 2 */ 57ab4382d2SGreg Kroah-Hartman #define UESC 0x9c /* Escape Character Register */ 58ab4382d2SGreg Kroah-Hartman #define UTIM 0xa0 /* Escape Timer Register */ 59ab4382d2SGreg Kroah-Hartman #define UBIR 0xa4 /* BRM Incremental Register */ 60ab4382d2SGreg Kroah-Hartman #define UBMR 0xa8 /* BRM Modulator Register */ 61ab4382d2SGreg Kroah-Hartman #define UBRC 0xac /* Baud Rate Count Register */ 62fe6b540aSShawn Guo #define IMX21_ONEMS 0xb0 /* One Millisecond register */ 63fe6b540aSShawn Guo #define IMX1_UTS 0xd0 /* UART Test Register on i.mx1 */ 64fe6b540aSShawn Guo #define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/ 65ab4382d2SGreg Kroah-Hartman 66ab4382d2SGreg Kroah-Hartman /* UART Control Register Bit Fields.*/ 6755d8693aSJiada Wang #define URXD_DUMMY_READ (1<<16) 68ab4382d2SGreg Kroah-Hartman #define URXD_CHARRDY (1<<15) 69ab4382d2SGreg Kroah-Hartman #define URXD_ERR (1<<14) 70ab4382d2SGreg Kroah-Hartman #define URXD_OVRRUN (1<<13) 71ab4382d2SGreg Kroah-Hartman #define URXD_FRMERR (1<<12) 72ab4382d2SGreg Kroah-Hartman #define URXD_BRK (1<<11) 73ab4382d2SGreg Kroah-Hartman #define URXD_PRERR (1<<10) 7426c47412SDirk Behme #define URXD_RX_DATA (0xFF<<0) 7525985edcSLucas De Marchi #define UCR1_ADEN (1<<15) /* Auto detect interrupt */ 76ab4382d2SGreg Kroah-Hartman #define UCR1_ADBR (1<<14) /* Auto detect baud rate */ 77ab4382d2SGreg Kroah-Hartman #define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */ 78ab4382d2SGreg Kroah-Hartman #define UCR1_IDEN (1<<12) /* Idle condition interrupt */ 79b4cdc8f6SHuang Shijie #define UCR1_ICD_REG(x) (((x) & 3) << 10) /* idle condition detect */ 80ab4382d2SGreg Kroah-Hartman #define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */ 81ab4382d2SGreg Kroah-Hartman #define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */ 82ab4382d2SGreg Kroah-Hartman #define UCR1_IREN (1<<7) /* Infrared interface enable */ 83ab4382d2SGreg Kroah-Hartman #define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */ 84ab4382d2SGreg Kroah-Hartman #define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */ 85ab4382d2SGreg Kroah-Hartman #define UCR1_SNDBRK (1<<4) /* Send break */ 86ab4382d2SGreg Kroah-Hartman #define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */ 87fe6b540aSShawn Guo #define IMX1_UCR1_UARTCLKEN (1<<2) /* UART clock enabled, i.mx1 only */ 88b4cdc8f6SHuang Shijie #define UCR1_ATDMAEN (1<<2) /* Aging DMA Timer Enable */ 89ab4382d2SGreg Kroah-Hartman #define UCR1_DOZE (1<<1) /* Doze */ 90ab4382d2SGreg Kroah-Hartman #define UCR1_UARTEN (1<<0) /* UART enabled */ 91ab4382d2SGreg Kroah-Hartman #define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */ 92ab4382d2SGreg Kroah-Hartman #define UCR2_IRTS (1<<14) /* Ignore RTS pin */ 93ab4382d2SGreg Kroah-Hartman #define UCR2_CTSC (1<<13) /* CTS pin control */ 94ab4382d2SGreg Kroah-Hartman #define UCR2_CTS (1<<12) /* Clear to send */ 95ab4382d2SGreg Kroah-Hartman #define UCR2_ESCEN (1<<11) /* Escape enable */ 96ab4382d2SGreg Kroah-Hartman #define UCR2_PREN (1<<8) /* Parity enable */ 97ab4382d2SGreg Kroah-Hartman #define UCR2_PROE (1<<7) /* Parity odd/even */ 98ab4382d2SGreg Kroah-Hartman #define UCR2_STPB (1<<6) /* Stop */ 99ab4382d2SGreg Kroah-Hartman #define UCR2_WS (1<<5) /* Word size */ 100ab4382d2SGreg Kroah-Hartman #define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */ 10101f56abdSSaleem Abdulrasool #define UCR2_ATEN (1<<3) /* Aging Timer Enable */ 102ab4382d2SGreg Kroah-Hartman #define UCR2_TXEN (1<<2) /* Transmitter enabled */ 103ab4382d2SGreg Kroah-Hartman #define UCR2_RXEN (1<<1) /* Receiver enabled */ 104ab4382d2SGreg Kroah-Hartman #define UCR2_SRST (1<<0) /* SW reset */ 105ab4382d2SGreg Kroah-Hartman #define UCR3_DTREN (1<<13) /* DTR interrupt enable */ 106ab4382d2SGreg Kroah-Hartman #define UCR3_PARERREN (1<<12) /* Parity enable */ 107ab4382d2SGreg Kroah-Hartman #define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */ 108ab4382d2SGreg Kroah-Hartman #define UCR3_DSR (1<<10) /* Data set ready */ 109ab4382d2SGreg Kroah-Hartman #define UCR3_DCD (1<<9) /* Data carrier detect */ 110ab4382d2SGreg Kroah-Hartman #define UCR3_RI (1<<8) /* Ring indicator */ 111b38cb7d2SFabio Estevam #define UCR3_ADNIMP (1<<7) /* Autobaud Detection Not Improved */ 112ab4382d2SGreg Kroah-Hartman #define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */ 113ab4382d2SGreg Kroah-Hartman #define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */ 114ab4382d2SGreg Kroah-Hartman #define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */ 115fe6b540aSShawn Guo #define IMX21_UCR3_RXDMUXSEL (1<<2) /* RXD Muxed Input Select */ 116ab4382d2SGreg Kroah-Hartman #define UCR3_INVT (1<<1) /* Inverted Infrared transmission */ 117ab4382d2SGreg Kroah-Hartman #define UCR3_BPEN (1<<0) /* Preset registers enable */ 118ab4382d2SGreg Kroah-Hartman #define UCR4_CTSTL_SHF 10 /* CTS trigger level shift */ 119ab4382d2SGreg Kroah-Hartman #define UCR4_CTSTL_MASK 0x3F /* CTS trigger is 6 bits wide */ 120ab4382d2SGreg Kroah-Hartman #define UCR4_INVR (1<<9) /* Inverted infrared reception */ 121ab4382d2SGreg Kroah-Hartman #define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */ 122ab4382d2SGreg Kroah-Hartman #define UCR4_WKEN (1<<7) /* Wake interrupt enable */ 123ab4382d2SGreg Kroah-Hartman #define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */ 124b4cdc8f6SHuang Shijie #define UCR4_IDDMAEN (1<<6) /* DMA IDLE Condition Detected */ 125ab4382d2SGreg Kroah-Hartman #define UCR4_IRSC (1<<5) /* IR special case */ 126ab4382d2SGreg Kroah-Hartman #define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */ 127ab4382d2SGreg Kroah-Hartman #define UCR4_BKEN (1<<2) /* Break condition interrupt enable */ 128ab4382d2SGreg Kroah-Hartman #define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */ 129ab4382d2SGreg Kroah-Hartman #define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */ 130ab4382d2SGreg Kroah-Hartman #define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */ 1317be0670fSDirk Behme #define UFCR_DCEDTE (1<<6) /* DCE/DTE mode select */ 132ab4382d2SGreg Kroah-Hartman #define UFCR_RFDIV (7<<7) /* Reference freq divider mask */ 133ab4382d2SGreg Kroah-Hartman #define UFCR_RFDIV_REG(x) (((x) < 7 ? 6 - (x) : 6) << 7) 134ab4382d2SGreg Kroah-Hartman #define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */ 135ab4382d2SGreg Kroah-Hartman #define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */ 136ab4382d2SGreg Kroah-Hartman #define USR1_RTSS (1<<14) /* RTS pin status */ 137ab4382d2SGreg Kroah-Hartman #define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */ 138ab4382d2SGreg Kroah-Hartman #define USR1_RTSD (1<<12) /* RTS delta */ 139ab4382d2SGreg Kroah-Hartman #define USR1_ESCF (1<<11) /* Escape seq interrupt flag */ 140ab4382d2SGreg Kroah-Hartman #define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */ 141ab4382d2SGreg Kroah-Hartman #define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */ 142*86a04ba6SLucas Stach #define USR1_AGTIM (1<<8) /* Ageing timer interrupt flag */ 143ab4382d2SGreg Kroah-Hartman #define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */ 144ab4382d2SGreg Kroah-Hartman #define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */ 145ab4382d2SGreg Kroah-Hartman #define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */ 146ab4382d2SGreg Kroah-Hartman #define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */ 147ab4382d2SGreg Kroah-Hartman #define USR2_ADET (1<<15) /* Auto baud rate detect complete */ 148ab4382d2SGreg Kroah-Hartman #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */ 149ab4382d2SGreg Kroah-Hartman #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */ 150ab4382d2SGreg Kroah-Hartman #define USR2_IDLE (1<<12) /* Idle condition */ 151ab4382d2SGreg Kroah-Hartman #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */ 152ab4382d2SGreg Kroah-Hartman #define USR2_WAKE (1<<7) /* Wake */ 153ab4382d2SGreg Kroah-Hartman #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */ 154ab4382d2SGreg Kroah-Hartman #define USR2_TXDC (1<<3) /* Transmitter complete */ 155ab4382d2SGreg Kroah-Hartman #define USR2_BRCD (1<<2) /* Break condition */ 156ab4382d2SGreg Kroah-Hartman #define USR2_ORE (1<<1) /* Overrun error */ 157ab4382d2SGreg Kroah-Hartman #define USR2_RDR (1<<0) /* Recv data ready */ 158ab4382d2SGreg Kroah-Hartman #define UTS_FRCPERR (1<<13) /* Force parity error */ 159ab4382d2SGreg Kroah-Hartman #define UTS_LOOP (1<<12) /* Loop tx and rx */ 160ab4382d2SGreg Kroah-Hartman #define UTS_TXEMPTY (1<<6) /* TxFIFO empty */ 161ab4382d2SGreg Kroah-Hartman #define UTS_RXEMPTY (1<<5) /* RxFIFO empty */ 162ab4382d2SGreg Kroah-Hartman #define UTS_TXFULL (1<<4) /* TxFIFO full */ 163ab4382d2SGreg Kroah-Hartman #define UTS_RXFULL (1<<3) /* RxFIFO full */ 164ab4382d2SGreg Kroah-Hartman #define UTS_SOFTRST (1<<0) /* Software reset */ 165ab4382d2SGreg Kroah-Hartman 166ab4382d2SGreg Kroah-Hartman /* We've been assigned a range on the "Low-density serial ports" major */ 167ab4382d2SGreg Kroah-Hartman #define SERIAL_IMX_MAJOR 207 168ab4382d2SGreg Kroah-Hartman #define MINOR_START 16 169ab4382d2SGreg Kroah-Hartman #define DEV_NAME "ttymxc" 170ab4382d2SGreg Kroah-Hartman 171ab4382d2SGreg Kroah-Hartman /* 172ab4382d2SGreg Kroah-Hartman * This determines how often we check the modem status signals 173ab4382d2SGreg Kroah-Hartman * for any change. They generally aren't connected to an IRQ 174ab4382d2SGreg Kroah-Hartman * so we have to poll them. We also check immediately before 175ab4382d2SGreg Kroah-Hartman * filling the TX fifo incase CTS has been dropped. 176ab4382d2SGreg Kroah-Hartman */ 177ab4382d2SGreg Kroah-Hartman #define MCTRL_TIMEOUT (250*HZ/1000) 178ab4382d2SGreg Kroah-Hartman 179ab4382d2SGreg Kroah-Hartman #define DRIVER_NAME "IMX-uart" 180ab4382d2SGreg Kroah-Hartman 181ab4382d2SGreg Kroah-Hartman #define UART_NR 8 182ab4382d2SGreg Kroah-Hartman 183f95661b2SUwe Kleine-König /* i.MX21 type uart runs on all i.mx except i.MX1 and i.MX6q */ 184fe6b540aSShawn Guo enum imx_uart_type { 185fe6b540aSShawn Guo IMX1_UART, 186fe6b540aSShawn Guo IMX21_UART, 187a496e628SHuang Shijie IMX6Q_UART, 188fe6b540aSShawn Guo }; 189fe6b540aSShawn Guo 190fe6b540aSShawn Guo /* device type dependent stuff */ 191fe6b540aSShawn Guo struct imx_uart_data { 192fe6b540aSShawn Guo unsigned uts_reg; 193fe6b540aSShawn Guo enum imx_uart_type devtype; 194fe6b540aSShawn Guo }; 195fe6b540aSShawn Guo 196ab4382d2SGreg Kroah-Hartman struct imx_port { 197ab4382d2SGreg Kroah-Hartman struct uart_port port; 198ab4382d2SGreg Kroah-Hartman struct timer_list timer; 199ab4382d2SGreg Kroah-Hartman unsigned int old_status; 200ab4382d2SGreg Kroah-Hartman unsigned int have_rtscts:1; 20120ff2fe6SHuang Shijie unsigned int dte_mode:1; 202ab4382d2SGreg Kroah-Hartman unsigned int irda_inv_rx:1; 203ab4382d2SGreg Kroah-Hartman unsigned int irda_inv_tx:1; 204ab4382d2SGreg Kroah-Hartman unsigned short trcv_delay; /* transceiver delay */ 2053a9465faSSascha Hauer struct clk *clk_ipg; 2063a9465faSSascha Hauer struct clk *clk_per; 2077d0b066fSUwe Kleine-König const struct imx_uart_data *devdata; 208b4cdc8f6SHuang Shijie 209b4cdc8f6SHuang Shijie /* DMA fields */ 210b4cdc8f6SHuang Shijie unsigned int dma_is_inited:1; 211b4cdc8f6SHuang Shijie unsigned int dma_is_enabled:1; 212b4cdc8f6SHuang Shijie unsigned int dma_is_rxing:1; 213b4cdc8f6SHuang Shijie unsigned int dma_is_txing:1; 214b4cdc8f6SHuang Shijie struct dma_chan *dma_chan_rx, *dma_chan_tx; 215b4cdc8f6SHuang Shijie struct scatterlist rx_sgl, tx_sgl[2]; 216b4cdc8f6SHuang Shijie void *rx_buf; 2177cb92fd2SHuang Shijie unsigned int tx_bytes; 218b4cdc8f6SHuang Shijie unsigned int dma_tx_nents; 2199ce4f8f3SGreg Kroah-Hartman wait_queue_head_t dma_wait; 22090bb6bd3SShenwei Wang unsigned int saved_reg[10]; 221c868cbb7SEduardo Valentin bool context_saved; 222ab4382d2SGreg Kroah-Hartman }; 223ab4382d2SGreg Kroah-Hartman 2240ad5a814SDirk Behme struct imx_port_ucrs { 2250ad5a814SDirk Behme unsigned int ucr1; 2260ad5a814SDirk Behme unsigned int ucr2; 2270ad5a814SDirk Behme unsigned int ucr3; 2280ad5a814SDirk Behme }; 2290ad5a814SDirk Behme 230fe6b540aSShawn Guo static struct imx_uart_data imx_uart_devdata[] = { 231fe6b540aSShawn Guo [IMX1_UART] = { 232fe6b540aSShawn Guo .uts_reg = IMX1_UTS, 233fe6b540aSShawn Guo .devtype = IMX1_UART, 234fe6b540aSShawn Guo }, 235fe6b540aSShawn Guo [IMX21_UART] = { 236fe6b540aSShawn Guo .uts_reg = IMX21_UTS, 237fe6b540aSShawn Guo .devtype = IMX21_UART, 238fe6b540aSShawn Guo }, 239a496e628SHuang Shijie [IMX6Q_UART] = { 240a496e628SHuang Shijie .uts_reg = IMX21_UTS, 241a496e628SHuang Shijie .devtype = IMX6Q_UART, 242a496e628SHuang Shijie }, 243fe6b540aSShawn Guo }; 244fe6b540aSShawn Guo 24531ada047SKrzysztof Kozlowski static const struct platform_device_id imx_uart_devtype[] = { 246fe6b540aSShawn Guo { 247fe6b540aSShawn Guo .name = "imx1-uart", 248fe6b540aSShawn Guo .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX1_UART], 249fe6b540aSShawn Guo }, { 250fe6b540aSShawn Guo .name = "imx21-uart", 251fe6b540aSShawn Guo .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX21_UART], 252fe6b540aSShawn Guo }, { 253a496e628SHuang Shijie .name = "imx6q-uart", 254a496e628SHuang Shijie .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX6Q_UART], 255a496e628SHuang Shijie }, { 256fe6b540aSShawn Guo /* sentinel */ 257fe6b540aSShawn Guo } 258fe6b540aSShawn Guo }; 259fe6b540aSShawn Guo MODULE_DEVICE_TABLE(platform, imx_uart_devtype); 260fe6b540aSShawn Guo 261ad3d4fdcSSanjeev Sharma static const struct of_device_id imx_uart_dt_ids[] = { 262a496e628SHuang Shijie { .compatible = "fsl,imx6q-uart", .data = &imx_uart_devdata[IMX6Q_UART], }, 26322698aa2SShawn Guo { .compatible = "fsl,imx1-uart", .data = &imx_uart_devdata[IMX1_UART], }, 26422698aa2SShawn Guo { .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX21_UART], }, 26522698aa2SShawn Guo { /* sentinel */ } 26622698aa2SShawn Guo }; 26722698aa2SShawn Guo MODULE_DEVICE_TABLE(of, imx_uart_dt_ids); 26822698aa2SShawn Guo 269fe6b540aSShawn Guo static inline unsigned uts_reg(struct imx_port *sport) 270fe6b540aSShawn Guo { 271fe6b540aSShawn Guo return sport->devdata->uts_reg; 272fe6b540aSShawn Guo } 273fe6b540aSShawn Guo 274fe6b540aSShawn Guo static inline int is_imx1_uart(struct imx_port *sport) 275fe6b540aSShawn Guo { 276fe6b540aSShawn Guo return sport->devdata->devtype == IMX1_UART; 277fe6b540aSShawn Guo } 278fe6b540aSShawn Guo 279fe6b540aSShawn Guo static inline int is_imx21_uart(struct imx_port *sport) 280fe6b540aSShawn Guo { 281fe6b540aSShawn Guo return sport->devdata->devtype == IMX21_UART; 282fe6b540aSShawn Guo } 283fe6b540aSShawn Guo 284a496e628SHuang Shijie static inline int is_imx6q_uart(struct imx_port *sport) 285a496e628SHuang Shijie { 286a496e628SHuang Shijie return sport->devdata->devtype == IMX6Q_UART; 287a496e628SHuang Shijie } 288ab4382d2SGreg Kroah-Hartman /* 28944a75411Sfabio.estevam@freescale.com * Save and restore functions for UCR1, UCR2 and UCR3 registers 29044a75411Sfabio.estevam@freescale.com */ 29193d94b37SFabio Estevam #if defined(CONFIG_SERIAL_IMX_CONSOLE) 29244a75411Sfabio.estevam@freescale.com static void imx_port_ucrs_save(struct uart_port *port, 29344a75411Sfabio.estevam@freescale.com struct imx_port_ucrs *ucr) 29444a75411Sfabio.estevam@freescale.com { 29544a75411Sfabio.estevam@freescale.com /* save control registers */ 29644a75411Sfabio.estevam@freescale.com ucr->ucr1 = readl(port->membase + UCR1); 29744a75411Sfabio.estevam@freescale.com ucr->ucr2 = readl(port->membase + UCR2); 29844a75411Sfabio.estevam@freescale.com ucr->ucr3 = readl(port->membase + UCR3); 29944a75411Sfabio.estevam@freescale.com } 30044a75411Sfabio.estevam@freescale.com 30144a75411Sfabio.estevam@freescale.com static void imx_port_ucrs_restore(struct uart_port *port, 30244a75411Sfabio.estevam@freescale.com struct imx_port_ucrs *ucr) 30344a75411Sfabio.estevam@freescale.com { 30444a75411Sfabio.estevam@freescale.com /* restore control registers */ 30544a75411Sfabio.estevam@freescale.com writel(ucr->ucr1, port->membase + UCR1); 30644a75411Sfabio.estevam@freescale.com writel(ucr->ucr2, port->membase + UCR2); 30744a75411Sfabio.estevam@freescale.com writel(ucr->ucr3, port->membase + UCR3); 30844a75411Sfabio.estevam@freescale.com } 309e8bfa760SFabio Estevam #endif 31044a75411Sfabio.estevam@freescale.com 31144a75411Sfabio.estevam@freescale.com /* 312ab4382d2SGreg Kroah-Hartman * Handle any change of modem status signal since we were last called. 313ab4382d2SGreg Kroah-Hartman */ 314ab4382d2SGreg Kroah-Hartman static void imx_mctrl_check(struct imx_port *sport) 315ab4382d2SGreg Kroah-Hartman { 316ab4382d2SGreg Kroah-Hartman unsigned int status, changed; 317ab4382d2SGreg Kroah-Hartman 318ab4382d2SGreg Kroah-Hartman status = sport->port.ops->get_mctrl(&sport->port); 319ab4382d2SGreg Kroah-Hartman changed = status ^ sport->old_status; 320ab4382d2SGreg Kroah-Hartman 321ab4382d2SGreg Kroah-Hartman if (changed == 0) 322ab4382d2SGreg Kroah-Hartman return; 323ab4382d2SGreg Kroah-Hartman 324ab4382d2SGreg Kroah-Hartman sport->old_status = status; 325ab4382d2SGreg Kroah-Hartman 326ab4382d2SGreg Kroah-Hartman if (changed & TIOCM_RI) 327ab4382d2SGreg Kroah-Hartman sport->port.icount.rng++; 328ab4382d2SGreg Kroah-Hartman if (changed & TIOCM_DSR) 329ab4382d2SGreg Kroah-Hartman sport->port.icount.dsr++; 330ab4382d2SGreg Kroah-Hartman if (changed & TIOCM_CAR) 331ab4382d2SGreg Kroah-Hartman uart_handle_dcd_change(&sport->port, status & TIOCM_CAR); 332ab4382d2SGreg Kroah-Hartman if (changed & TIOCM_CTS) 333ab4382d2SGreg Kroah-Hartman uart_handle_cts_change(&sport->port, status & TIOCM_CTS); 334ab4382d2SGreg Kroah-Hartman 335ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&sport->port.state->port.delta_msr_wait); 336ab4382d2SGreg Kroah-Hartman } 337ab4382d2SGreg Kroah-Hartman 338ab4382d2SGreg Kroah-Hartman /* 339ab4382d2SGreg Kroah-Hartman * This is our per-port timeout handler, for checking the 340ab4382d2SGreg Kroah-Hartman * modem status signals. 341ab4382d2SGreg Kroah-Hartman */ 342ab4382d2SGreg Kroah-Hartman static void imx_timeout(unsigned long data) 343ab4382d2SGreg Kroah-Hartman { 344ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)data; 345ab4382d2SGreg Kroah-Hartman unsigned long flags; 346ab4382d2SGreg Kroah-Hartman 347ab4382d2SGreg Kroah-Hartman if (sport->port.state) { 348ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 349ab4382d2SGreg Kroah-Hartman imx_mctrl_check(sport); 350ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 351ab4382d2SGreg Kroah-Hartman 352ab4382d2SGreg Kroah-Hartman mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT); 353ab4382d2SGreg Kroah-Hartman } 354ab4382d2SGreg Kroah-Hartman } 355ab4382d2SGreg Kroah-Hartman 356ab4382d2SGreg Kroah-Hartman /* 357ab4382d2SGreg Kroah-Hartman * interrupts disabled on entry 358ab4382d2SGreg Kroah-Hartman */ 359ab4382d2SGreg Kroah-Hartman static void imx_stop_tx(struct uart_port *port) 360ab4382d2SGreg Kroah-Hartman { 361ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 362ab4382d2SGreg Kroah-Hartman unsigned long temp; 363ab4382d2SGreg Kroah-Hartman 3649ce4f8f3SGreg Kroah-Hartman /* 3659ce4f8f3SGreg Kroah-Hartman * We are maybe in the SMP context, so if the DMA TX thread is running 3669ce4f8f3SGreg Kroah-Hartman * on other cpu, we have to wait for it to finish. 3679ce4f8f3SGreg Kroah-Hartman */ 3689ce4f8f3SGreg Kroah-Hartman if (sport->dma_is_enabled && sport->dma_is_txing) 3699ce4f8f3SGreg Kroah-Hartman return; 370b4cdc8f6SHuang Shijie 37117b8f2a3SUwe Kleine-König temp = readl(port->membase + UCR1); 37217b8f2a3SUwe Kleine-König writel(temp & ~UCR1_TXMPTYEN, port->membase + UCR1); 37317b8f2a3SUwe Kleine-König 37417b8f2a3SUwe Kleine-König /* in rs485 mode disable transmitter if shifter is empty */ 37517b8f2a3SUwe Kleine-König if (port->rs485.flags & SER_RS485_ENABLED && 37617b8f2a3SUwe Kleine-König readl(port->membase + USR2) & USR2_TXDC) { 37717b8f2a3SUwe Kleine-König temp = readl(port->membase + UCR2); 37817b8f2a3SUwe Kleine-König if (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) 37917b8f2a3SUwe Kleine-König temp &= ~UCR2_CTS; 38017b8f2a3SUwe Kleine-König else 38117b8f2a3SUwe Kleine-König temp |= UCR2_CTS; 38217b8f2a3SUwe Kleine-König writel(temp, port->membase + UCR2); 38317b8f2a3SUwe Kleine-König 38417b8f2a3SUwe Kleine-König temp = readl(port->membase + UCR4); 38517b8f2a3SUwe Kleine-König temp &= ~UCR4_TCEN; 38617b8f2a3SUwe Kleine-König writel(temp, port->membase + UCR4); 38717b8f2a3SUwe Kleine-König } 388ab4382d2SGreg Kroah-Hartman } 389ab4382d2SGreg Kroah-Hartman 390ab4382d2SGreg Kroah-Hartman /* 391ab4382d2SGreg Kroah-Hartman * interrupts disabled on entry 392ab4382d2SGreg Kroah-Hartman */ 393ab4382d2SGreg Kroah-Hartman static void imx_stop_rx(struct uart_port *port) 394ab4382d2SGreg Kroah-Hartman { 395ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 396ab4382d2SGreg Kroah-Hartman unsigned long temp; 397ab4382d2SGreg Kroah-Hartman 39845564a66SHuang Shijie if (sport->dma_is_enabled && sport->dma_is_rxing) { 39945564a66SHuang Shijie if (sport->port.suspended) { 40045564a66SHuang Shijie dmaengine_terminate_all(sport->dma_chan_rx); 40145564a66SHuang Shijie sport->dma_is_rxing = 0; 40245564a66SHuang Shijie } else { 4039ce4f8f3SGreg Kroah-Hartman return; 40445564a66SHuang Shijie } 40545564a66SHuang Shijie } 406b4cdc8f6SHuang Shijie 407ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR2); 408ab4382d2SGreg Kroah-Hartman writel(temp & ~UCR2_RXEN, sport->port.membase + UCR2); 40985878399SHuang Shijie 41085878399SHuang Shijie /* disable the `Receiver Ready Interrrupt` */ 41185878399SHuang Shijie temp = readl(sport->port.membase + UCR1); 41285878399SHuang Shijie writel(temp & ~UCR1_RRDYEN, sport->port.membase + UCR1); 413ab4382d2SGreg Kroah-Hartman } 414ab4382d2SGreg Kroah-Hartman 415ab4382d2SGreg Kroah-Hartman /* 416ab4382d2SGreg Kroah-Hartman * Set the modem control timer to fire immediately. 417ab4382d2SGreg Kroah-Hartman */ 418ab4382d2SGreg Kroah-Hartman static void imx_enable_ms(struct uart_port *port) 419ab4382d2SGreg Kroah-Hartman { 420ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 421ab4382d2SGreg Kroah-Hartman 422ab4382d2SGreg Kroah-Hartman mod_timer(&sport->timer, jiffies); 423ab4382d2SGreg Kroah-Hartman } 424ab4382d2SGreg Kroah-Hartman 42591a1a909SJiada Wang static void imx_dma_tx(struct imx_port *sport); 426ab4382d2SGreg Kroah-Hartman static inline void imx_transmit_buffer(struct imx_port *sport) 427ab4382d2SGreg Kroah-Hartman { 428ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &sport->port.state->xmit; 42991a1a909SJiada Wang unsigned long temp; 430ab4382d2SGreg Kroah-Hartman 4315e42e9a3SPeter Hurley if (sport->port.x_char) { 4325e42e9a3SPeter Hurley /* Send next char */ 4335e42e9a3SPeter Hurley writel(sport->port.x_char, sport->port.membase + URTX0); 4347e2fb5aaSJiada Wang sport->port.icount.tx++; 4357e2fb5aaSJiada Wang sport->port.x_char = 0; 4365e42e9a3SPeter Hurley return; 4375e42e9a3SPeter Hurley } 4385e42e9a3SPeter Hurley 4395e42e9a3SPeter Hurley if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { 4405e42e9a3SPeter Hurley imx_stop_tx(&sport->port); 4415e42e9a3SPeter Hurley return; 4425e42e9a3SPeter Hurley } 4435e42e9a3SPeter Hurley 44491a1a909SJiada Wang if (sport->dma_is_enabled) { 44591a1a909SJiada Wang /* 44691a1a909SJiada Wang * We've just sent a X-char Ensure the TX DMA is enabled 44791a1a909SJiada Wang * and the TX IRQ is disabled. 44891a1a909SJiada Wang **/ 44991a1a909SJiada Wang temp = readl(sport->port.membase + UCR1); 45091a1a909SJiada Wang temp &= ~UCR1_TXMPTYEN; 45191a1a909SJiada Wang if (sport->dma_is_txing) { 45291a1a909SJiada Wang temp |= UCR1_TDMAEN; 45391a1a909SJiada Wang writel(temp, sport->port.membase + UCR1); 45491a1a909SJiada Wang } else { 45591a1a909SJiada Wang writel(temp, sport->port.membase + UCR1); 45691a1a909SJiada Wang imx_dma_tx(sport); 45791a1a909SJiada Wang } 45891a1a909SJiada Wang } 45991a1a909SJiada Wang 460ab4382d2SGreg Kroah-Hartman while (!uart_circ_empty(xmit) && 4615e42e9a3SPeter Hurley !(readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL)) { 462ab4382d2SGreg Kroah-Hartman /* send xmit->buf[xmit->tail] 463ab4382d2SGreg Kroah-Hartman * out the port here */ 464ab4382d2SGreg Kroah-Hartman writel(xmit->buf[xmit->tail], sport->port.membase + URTX0); 465ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); 466ab4382d2SGreg Kroah-Hartman sport->port.icount.tx++; 467ab4382d2SGreg Kroah-Hartman } 468ab4382d2SGreg Kroah-Hartman 469ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 470ab4382d2SGreg Kroah-Hartman uart_write_wakeup(&sport->port); 471ab4382d2SGreg Kroah-Hartman 472ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit)) 473ab4382d2SGreg Kroah-Hartman imx_stop_tx(&sport->port); 474ab4382d2SGreg Kroah-Hartman } 475ab4382d2SGreg Kroah-Hartman 476b4cdc8f6SHuang Shijie static void dma_tx_callback(void *data) 477b4cdc8f6SHuang Shijie { 478b4cdc8f6SHuang Shijie struct imx_port *sport = data; 479b4cdc8f6SHuang Shijie struct scatterlist *sgl = &sport->tx_sgl[0]; 480b4cdc8f6SHuang Shijie struct circ_buf *xmit = &sport->port.state->xmit; 481b4cdc8f6SHuang Shijie unsigned long flags; 482a2c718ceSDirk Behme unsigned long temp; 483b4cdc8f6SHuang Shijie 48442f752b3SDirk Behme spin_lock_irqsave(&sport->port.lock, flags); 48542f752b3SDirk Behme 486b4cdc8f6SHuang Shijie dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); 487b4cdc8f6SHuang Shijie 488a2c718ceSDirk Behme temp = readl(sport->port.membase + UCR1); 489a2c718ceSDirk Behme temp &= ~UCR1_TDMAEN; 490a2c718ceSDirk Behme writel(temp, sport->port.membase + UCR1); 491a2c718ceSDirk Behme 49242f752b3SDirk Behme /* update the stat */ 49342f752b3SDirk Behme xmit->tail = (xmit->tail + sport->tx_bytes) & (UART_XMIT_SIZE - 1); 49442f752b3SDirk Behme sport->port.icount.tx += sport->tx_bytes; 49542f752b3SDirk Behme 49642f752b3SDirk Behme dev_dbg(sport->port.dev, "we finish the TX DMA.\n"); 49742f752b3SDirk Behme 498b4cdc8f6SHuang Shijie sport->dma_is_txing = 0; 499b4cdc8f6SHuang Shijie 500b4cdc8f6SHuang Shijie spin_unlock_irqrestore(&sport->port.lock, flags); 501b4cdc8f6SHuang Shijie 502d64b8607SJiada Wang if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 503b4cdc8f6SHuang Shijie uart_write_wakeup(&sport->port); 5049ce4f8f3SGreg Kroah-Hartman 5059ce4f8f3SGreg Kroah-Hartman if (waitqueue_active(&sport->dma_wait)) { 5069ce4f8f3SGreg Kroah-Hartman wake_up(&sport->dma_wait); 5079ce4f8f3SGreg Kroah-Hartman dev_dbg(sport->port.dev, "exit in %s.\n", __func__); 5089ce4f8f3SGreg Kroah-Hartman return; 5099ce4f8f3SGreg Kroah-Hartman } 5100bbc9b81SJiada Wang 5110bbc9b81SJiada Wang spin_lock_irqsave(&sport->port.lock, flags); 5120bbc9b81SJiada Wang if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port)) 5130bbc9b81SJiada Wang imx_dma_tx(sport); 5140bbc9b81SJiada Wang spin_unlock_irqrestore(&sport->port.lock, flags); 515b4cdc8f6SHuang Shijie } 516b4cdc8f6SHuang Shijie 5177cb92fd2SHuang Shijie static void imx_dma_tx(struct imx_port *sport) 518b4cdc8f6SHuang Shijie { 519b4cdc8f6SHuang Shijie struct circ_buf *xmit = &sport->port.state->xmit; 520b4cdc8f6SHuang Shijie struct scatterlist *sgl = sport->tx_sgl; 521b4cdc8f6SHuang Shijie struct dma_async_tx_descriptor *desc; 522b4cdc8f6SHuang Shijie struct dma_chan *chan = sport->dma_chan_tx; 523b4cdc8f6SHuang Shijie struct device *dev = sport->port.dev; 524a2c718ceSDirk Behme unsigned long temp; 525b4cdc8f6SHuang Shijie int ret; 526b4cdc8f6SHuang Shijie 52742f752b3SDirk Behme if (sport->dma_is_txing) 528b4cdc8f6SHuang Shijie return; 529b4cdc8f6SHuang Shijie 530b4cdc8f6SHuang Shijie sport->tx_bytes = uart_circ_chars_pending(xmit); 531b4cdc8f6SHuang Shijie 5327942f857SDirk Behme if (xmit->tail < xmit->head) { 5337942f857SDirk Behme sport->dma_tx_nents = 1; 5347942f857SDirk Behme sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes); 5357942f857SDirk Behme } else { 536b4cdc8f6SHuang Shijie sport->dma_tx_nents = 2; 537b4cdc8f6SHuang Shijie sg_init_table(sgl, 2); 538b4cdc8f6SHuang Shijie sg_set_buf(sgl, xmit->buf + xmit->tail, 539b4cdc8f6SHuang Shijie UART_XMIT_SIZE - xmit->tail); 540b4cdc8f6SHuang Shijie sg_set_buf(sgl + 1, xmit->buf, xmit->head); 541b4cdc8f6SHuang Shijie } 542b4cdc8f6SHuang Shijie 543b4cdc8f6SHuang Shijie ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); 544b4cdc8f6SHuang Shijie if (ret == 0) { 545b4cdc8f6SHuang Shijie dev_err(dev, "DMA mapping error for TX.\n"); 546b4cdc8f6SHuang Shijie return; 547b4cdc8f6SHuang Shijie } 548b4cdc8f6SHuang Shijie desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents, 549b4cdc8f6SHuang Shijie DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); 550b4cdc8f6SHuang Shijie if (!desc) { 55124649821SDirk Behme dma_unmap_sg(dev, sgl, sport->dma_tx_nents, 55224649821SDirk Behme DMA_TO_DEVICE); 553b4cdc8f6SHuang Shijie dev_err(dev, "We cannot prepare for the TX slave dma!\n"); 554b4cdc8f6SHuang Shijie return; 555b4cdc8f6SHuang Shijie } 556b4cdc8f6SHuang Shijie desc->callback = dma_tx_callback; 557b4cdc8f6SHuang Shijie desc->callback_param = sport; 558b4cdc8f6SHuang Shijie 559b4cdc8f6SHuang Shijie dev_dbg(dev, "TX: prepare to send %lu bytes by DMA.\n", 560b4cdc8f6SHuang Shijie uart_circ_chars_pending(xmit)); 561a2c718ceSDirk Behme 562a2c718ceSDirk Behme temp = readl(sport->port.membase + UCR1); 563a2c718ceSDirk Behme temp |= UCR1_TDMAEN; 564a2c718ceSDirk Behme writel(temp, sport->port.membase + UCR1); 565a2c718ceSDirk Behme 566b4cdc8f6SHuang Shijie /* fire it */ 567b4cdc8f6SHuang Shijie sport->dma_is_txing = 1; 568b4cdc8f6SHuang Shijie dmaengine_submit(desc); 569b4cdc8f6SHuang Shijie dma_async_issue_pending(chan); 570b4cdc8f6SHuang Shijie return; 571b4cdc8f6SHuang Shijie } 572b4cdc8f6SHuang Shijie 573ab4382d2SGreg Kroah-Hartman /* 574ab4382d2SGreg Kroah-Hartman * interrupts disabled on entry 575ab4382d2SGreg Kroah-Hartman */ 576ab4382d2SGreg Kroah-Hartman static void imx_start_tx(struct uart_port *port) 577ab4382d2SGreg Kroah-Hartman { 578ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 579ab4382d2SGreg Kroah-Hartman unsigned long temp; 580ab4382d2SGreg Kroah-Hartman 58117b8f2a3SUwe Kleine-König if (port->rs485.flags & SER_RS485_ENABLED) { 58217b8f2a3SUwe Kleine-König /* enable transmitter and shifter empty irq */ 58317b8f2a3SUwe Kleine-König temp = readl(port->membase + UCR2); 58417b8f2a3SUwe Kleine-König if (port->rs485.flags & SER_RS485_RTS_ON_SEND) 58517b8f2a3SUwe Kleine-König temp &= ~UCR2_CTS; 58617b8f2a3SUwe Kleine-König else 58717b8f2a3SUwe Kleine-König temp |= UCR2_CTS; 58817b8f2a3SUwe Kleine-König writel(temp, port->membase + UCR2); 58917b8f2a3SUwe Kleine-König 59017b8f2a3SUwe Kleine-König temp = readl(port->membase + UCR4); 59117b8f2a3SUwe Kleine-König temp |= UCR4_TCEN; 59217b8f2a3SUwe Kleine-König writel(temp, port->membase + UCR4); 59317b8f2a3SUwe Kleine-König } 59417b8f2a3SUwe Kleine-König 595b4cdc8f6SHuang Shijie if (!sport->dma_is_enabled) { 596ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1); 597ab4382d2SGreg Kroah-Hartman writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1); 598b4cdc8f6SHuang Shijie } 599ab4382d2SGreg Kroah-Hartman 600b4cdc8f6SHuang Shijie if (sport->dma_is_enabled) { 60191a1a909SJiada Wang if (sport->port.x_char) { 60291a1a909SJiada Wang /* We have X-char to send, so enable TX IRQ and 60391a1a909SJiada Wang * disable TX DMA to let TX interrupt to send X-char */ 60491a1a909SJiada Wang temp = readl(sport->port.membase + UCR1); 60591a1a909SJiada Wang temp &= ~UCR1_TDMAEN; 60691a1a909SJiada Wang temp |= UCR1_TXMPTYEN; 60791a1a909SJiada Wang writel(temp, sport->port.membase + UCR1); 60891a1a909SJiada Wang return; 60991a1a909SJiada Wang } 61091a1a909SJiada Wang 6115e42e9a3SPeter Hurley if (!uart_circ_empty(&port->state->xmit) && 6125e42e9a3SPeter Hurley !uart_tx_stopped(port)) 6137cb92fd2SHuang Shijie imx_dma_tx(sport); 614b4cdc8f6SHuang Shijie return; 615b4cdc8f6SHuang Shijie } 616ab4382d2SGreg Kroah-Hartman } 617ab4382d2SGreg Kroah-Hartman 618ab4382d2SGreg Kroah-Hartman static irqreturn_t imx_rtsint(int irq, void *dev_id) 619ab4382d2SGreg Kroah-Hartman { 620ab4382d2SGreg Kroah-Hartman struct imx_port *sport = dev_id; 6215680e941SUwe Kleine-König unsigned int val; 622ab4382d2SGreg Kroah-Hartman unsigned long flags; 623ab4382d2SGreg Kroah-Hartman 624ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 625ab4382d2SGreg Kroah-Hartman 626ab4382d2SGreg Kroah-Hartman writel(USR1_RTSD, sport->port.membase + USR1); 6275680e941SUwe Kleine-König val = readl(sport->port.membase + USR1) & USR1_RTSS; 628ab4382d2SGreg Kroah-Hartman uart_handle_cts_change(&sport->port, !!val); 629ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&sport->port.state->port.delta_msr_wait); 630ab4382d2SGreg Kroah-Hartman 631ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 632ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 633ab4382d2SGreg Kroah-Hartman } 634ab4382d2SGreg Kroah-Hartman 635ab4382d2SGreg Kroah-Hartman static irqreturn_t imx_txint(int irq, void *dev_id) 636ab4382d2SGreg Kroah-Hartman { 637ab4382d2SGreg Kroah-Hartman struct imx_port *sport = dev_id; 638ab4382d2SGreg Kroah-Hartman unsigned long flags; 639ab4382d2SGreg Kroah-Hartman 640ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 641ab4382d2SGreg Kroah-Hartman imx_transmit_buffer(sport); 642ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 643ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 644ab4382d2SGreg Kroah-Hartman } 645ab4382d2SGreg Kroah-Hartman 646ab4382d2SGreg Kroah-Hartman static irqreturn_t imx_rxint(int irq, void *dev_id) 647ab4382d2SGreg Kroah-Hartman { 648ab4382d2SGreg Kroah-Hartman struct imx_port *sport = dev_id; 649ab4382d2SGreg Kroah-Hartman unsigned int rx, flg, ignored = 0; 65092a19f9cSJiri Slaby struct tty_port *port = &sport->port.state->port; 651ab4382d2SGreg Kroah-Hartman unsigned long flags, temp; 652ab4382d2SGreg Kroah-Hartman 653ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 654ab4382d2SGreg Kroah-Hartman 655ab4382d2SGreg Kroah-Hartman while (readl(sport->port.membase + USR2) & USR2_RDR) { 656ab4382d2SGreg Kroah-Hartman flg = TTY_NORMAL; 657ab4382d2SGreg Kroah-Hartman sport->port.icount.rx++; 658ab4382d2SGreg Kroah-Hartman 659ab4382d2SGreg Kroah-Hartman rx = readl(sport->port.membase + URXD0); 660ab4382d2SGreg Kroah-Hartman 661ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + USR2); 662ab4382d2SGreg Kroah-Hartman if (temp & USR2_BRCD) { 663ab4382d2SGreg Kroah-Hartman writel(USR2_BRCD, sport->port.membase + USR2); 664ab4382d2SGreg Kroah-Hartman if (uart_handle_break(&sport->port)) 665ab4382d2SGreg Kroah-Hartman continue; 666ab4382d2SGreg Kroah-Hartman } 667ab4382d2SGreg Kroah-Hartman 668ab4382d2SGreg Kroah-Hartman if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx)) 669ab4382d2SGreg Kroah-Hartman continue; 670ab4382d2SGreg Kroah-Hartman 671019dc9eaSHui Wang if (unlikely(rx & URXD_ERR)) { 672019dc9eaSHui Wang if (rx & URXD_BRK) 673019dc9eaSHui Wang sport->port.icount.brk++; 674019dc9eaSHui Wang else if (rx & URXD_PRERR) 675ab4382d2SGreg Kroah-Hartman sport->port.icount.parity++; 676ab4382d2SGreg Kroah-Hartman else if (rx & URXD_FRMERR) 677ab4382d2SGreg Kroah-Hartman sport->port.icount.frame++; 678ab4382d2SGreg Kroah-Hartman if (rx & URXD_OVRRUN) 679ab4382d2SGreg Kroah-Hartman sport->port.icount.overrun++; 680ab4382d2SGreg Kroah-Hartman 681ab4382d2SGreg Kroah-Hartman if (rx & sport->port.ignore_status_mask) { 682ab4382d2SGreg Kroah-Hartman if (++ignored > 100) 683ab4382d2SGreg Kroah-Hartman goto out; 684ab4382d2SGreg Kroah-Hartman continue; 685ab4382d2SGreg Kroah-Hartman } 686ab4382d2SGreg Kroah-Hartman 6878d267fd9SEric Nelson rx &= (sport->port.read_status_mask | 0xFF); 688ab4382d2SGreg Kroah-Hartman 689019dc9eaSHui Wang if (rx & URXD_BRK) 690019dc9eaSHui Wang flg = TTY_BREAK; 691019dc9eaSHui Wang else if (rx & URXD_PRERR) 692ab4382d2SGreg Kroah-Hartman flg = TTY_PARITY; 693ab4382d2SGreg Kroah-Hartman else if (rx & URXD_FRMERR) 694ab4382d2SGreg Kroah-Hartman flg = TTY_FRAME; 695ab4382d2SGreg Kroah-Hartman if (rx & URXD_OVRRUN) 696ab4382d2SGreg Kroah-Hartman flg = TTY_OVERRUN; 697ab4382d2SGreg Kroah-Hartman 698ab4382d2SGreg Kroah-Hartman #ifdef SUPPORT_SYSRQ 699ab4382d2SGreg Kroah-Hartman sport->port.sysrq = 0; 700ab4382d2SGreg Kroah-Hartman #endif 701ab4382d2SGreg Kroah-Hartman } 702ab4382d2SGreg Kroah-Hartman 70355d8693aSJiada Wang if (sport->port.ignore_status_mask & URXD_DUMMY_READ) 70455d8693aSJiada Wang goto out; 70555d8693aSJiada Wang 7069b289932SManfred Schlaegl if (tty_insert_flip_char(port, rx, flg) == 0) 7079b289932SManfred Schlaegl sport->port.icount.buf_overrun++; 708ab4382d2SGreg Kroah-Hartman } 709ab4382d2SGreg Kroah-Hartman 710ab4382d2SGreg Kroah-Hartman out: 711ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 7122e124b4aSJiri Slaby tty_flip_buffer_push(port); 713ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 714ab4382d2SGreg Kroah-Hartman } 715ab4382d2SGreg Kroah-Hartman 7167cb92fd2SHuang Shijie static int start_rx_dma(struct imx_port *sport); 717b4cdc8f6SHuang Shijie /* 718b4cdc8f6SHuang Shijie * If the RXFIFO is filled with some data, and then we 719b4cdc8f6SHuang Shijie * arise a DMA operation to receive them. 720b4cdc8f6SHuang Shijie */ 721b4cdc8f6SHuang Shijie static void imx_dma_rxint(struct imx_port *sport) 722b4cdc8f6SHuang Shijie { 723b4cdc8f6SHuang Shijie unsigned long temp; 72473631813SJiada Wang unsigned long flags; 72573631813SJiada Wang 72673631813SJiada Wang spin_lock_irqsave(&sport->port.lock, flags); 727b4cdc8f6SHuang Shijie 728b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + USR2); 729b4cdc8f6SHuang Shijie if ((temp & USR2_RDR) && !sport->dma_is_rxing) { 730b4cdc8f6SHuang Shijie sport->dma_is_rxing = 1; 731b4cdc8f6SHuang Shijie 732*86a04ba6SLucas Stach /* disable the receiver ready and aging timer interrupts */ 733b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR1); 734b4cdc8f6SHuang Shijie temp &= ~(UCR1_RRDYEN); 735b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR1); 736b4cdc8f6SHuang Shijie 737*86a04ba6SLucas Stach temp = readl(sport->port.membase + UCR2); 738*86a04ba6SLucas Stach temp &= ~(UCR2_ATEN); 739*86a04ba6SLucas Stach writel(temp, sport->port.membase + UCR2); 740*86a04ba6SLucas Stach 741b4cdc8f6SHuang Shijie /* tell the DMA to receive the data. */ 7427cb92fd2SHuang Shijie start_rx_dma(sport); 743b4cdc8f6SHuang Shijie } 74473631813SJiada Wang 74573631813SJiada Wang spin_unlock_irqrestore(&sport->port.lock, flags); 746b4cdc8f6SHuang Shijie } 747b4cdc8f6SHuang Shijie 748ab4382d2SGreg Kroah-Hartman static irqreturn_t imx_int(int irq, void *dev_id) 749ab4382d2SGreg Kroah-Hartman { 750ab4382d2SGreg Kroah-Hartman struct imx_port *sport = dev_id; 751ab4382d2SGreg Kroah-Hartman unsigned int sts; 752f1f836e4SAlexander Stein unsigned int sts2; 753ab4382d2SGreg Kroah-Hartman 754ab4382d2SGreg Kroah-Hartman sts = readl(sport->port.membase + USR1); 75517b8f2a3SUwe Kleine-König sts2 = readl(sport->port.membase + USR2); 756ab4382d2SGreg Kroah-Hartman 757*86a04ba6SLucas Stach if (sts & (USR1_RRDY | USR1_AGTIM)) { 758b4cdc8f6SHuang Shijie if (sport->dma_is_enabled) 759b4cdc8f6SHuang Shijie imx_dma_rxint(sport); 760b4cdc8f6SHuang Shijie else 761ab4382d2SGreg Kroah-Hartman imx_rxint(irq, dev_id); 762b4cdc8f6SHuang Shijie } 763ab4382d2SGreg Kroah-Hartman 76417b8f2a3SUwe Kleine-König if ((sts & USR1_TRDY && 76517b8f2a3SUwe Kleine-König readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN) || 76617b8f2a3SUwe Kleine-König (sts2 & USR2_TXDC && 76717b8f2a3SUwe Kleine-König readl(sport->port.membase + UCR4) & UCR4_TCEN)) 768ab4382d2SGreg Kroah-Hartman imx_txint(irq, dev_id); 769ab4382d2SGreg Kroah-Hartman 770ab4382d2SGreg Kroah-Hartman if (sts & USR1_RTSD) 771ab4382d2SGreg Kroah-Hartman imx_rtsint(irq, dev_id); 772ab4382d2SGreg Kroah-Hartman 773db1a9b55SFabio Estevam if (sts & USR1_AWAKE) 774db1a9b55SFabio Estevam writel(USR1_AWAKE, sport->port.membase + USR1); 775db1a9b55SFabio Estevam 776f1f836e4SAlexander Stein if (sts2 & USR2_ORE) { 777f1f836e4SAlexander Stein sport->port.icount.overrun++; 77891555ce9SUwe Kleine-König writel(USR2_ORE, sport->port.membase + USR2); 779f1f836e4SAlexander Stein } 780f1f836e4SAlexander Stein 781ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 782ab4382d2SGreg Kroah-Hartman } 783ab4382d2SGreg Kroah-Hartman 784ab4382d2SGreg Kroah-Hartman /* 785ab4382d2SGreg Kroah-Hartman * Return TIOCSER_TEMT when transmitter is not busy. 786ab4382d2SGreg Kroah-Hartman */ 787ab4382d2SGreg Kroah-Hartman static unsigned int imx_tx_empty(struct uart_port *port) 788ab4382d2SGreg Kroah-Hartman { 789ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 7901ce43e58SHuang Shijie unsigned int ret; 791ab4382d2SGreg Kroah-Hartman 7921ce43e58SHuang Shijie ret = (readl(sport->port.membase + USR2) & USR2_TXDC) ? TIOCSER_TEMT : 0; 7931ce43e58SHuang Shijie 7941ce43e58SHuang Shijie /* If the TX DMA is working, return 0. */ 7951ce43e58SHuang Shijie if (sport->dma_is_enabled && sport->dma_is_txing) 7961ce43e58SHuang Shijie ret = 0; 7971ce43e58SHuang Shijie 7981ce43e58SHuang Shijie return ret; 799ab4382d2SGreg Kroah-Hartman } 800ab4382d2SGreg Kroah-Hartman 801ab4382d2SGreg Kroah-Hartman /* 802ab4382d2SGreg Kroah-Hartman * We have a modem side uart, so the meanings of RTS and CTS are inverted. 803ab4382d2SGreg Kroah-Hartman */ 804ab4382d2SGreg Kroah-Hartman static unsigned int imx_get_mctrl(struct uart_port *port) 805ab4382d2SGreg Kroah-Hartman { 806ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 807ab4382d2SGreg Kroah-Hartman unsigned int tmp = TIOCM_DSR | TIOCM_CAR; 808ab4382d2SGreg Kroah-Hartman 809ab4382d2SGreg Kroah-Hartman if (readl(sport->port.membase + USR1) & USR1_RTSS) 810ab4382d2SGreg Kroah-Hartman tmp |= TIOCM_CTS; 811ab4382d2SGreg Kroah-Hartman 812ab4382d2SGreg Kroah-Hartman if (readl(sport->port.membase + UCR2) & UCR2_CTS) 813ab4382d2SGreg Kroah-Hartman tmp |= TIOCM_RTS; 814ab4382d2SGreg Kroah-Hartman 8156b471a98SHuang Shijie if (readl(sport->port.membase + uts_reg(sport)) & UTS_LOOP) 8166b471a98SHuang Shijie tmp |= TIOCM_LOOP; 8176b471a98SHuang Shijie 818ab4382d2SGreg Kroah-Hartman return tmp; 819ab4382d2SGreg Kroah-Hartman } 820ab4382d2SGreg Kroah-Hartman 821ab4382d2SGreg Kroah-Hartman static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl) 822ab4382d2SGreg Kroah-Hartman { 823ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 824ab4382d2SGreg Kroah-Hartman unsigned long temp; 825ab4382d2SGreg Kroah-Hartman 82617b8f2a3SUwe Kleine-König if (!(port->rs485.flags & SER_RS485_ENABLED)) { 82717b8f2a3SUwe Kleine-König temp = readl(sport->port.membase + UCR2); 82817b8f2a3SUwe Kleine-König temp &= ~(UCR2_CTS | UCR2_CTSC); 829ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_RTS) 830bb2f861aSFugang Duan temp |= UCR2_CTS | UCR2_CTSC; 831ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR2); 83217b8f2a3SUwe Kleine-König } 8336b471a98SHuang Shijie 8346b471a98SHuang Shijie temp = readl(sport->port.membase + uts_reg(sport)) & ~UTS_LOOP; 8356b471a98SHuang Shijie if (mctrl & TIOCM_LOOP) 8366b471a98SHuang Shijie temp |= UTS_LOOP; 8376b471a98SHuang Shijie writel(temp, sport->port.membase + uts_reg(sport)); 838ab4382d2SGreg Kroah-Hartman } 839ab4382d2SGreg Kroah-Hartman 840ab4382d2SGreg Kroah-Hartman /* 841ab4382d2SGreg Kroah-Hartman * Interrupts always disabled. 842ab4382d2SGreg Kroah-Hartman */ 843ab4382d2SGreg Kroah-Hartman static void imx_break_ctl(struct uart_port *port, int break_state) 844ab4382d2SGreg Kroah-Hartman { 845ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 846ab4382d2SGreg Kroah-Hartman unsigned long flags, temp; 847ab4382d2SGreg Kroah-Hartman 848ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 849ab4382d2SGreg Kroah-Hartman 850ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1) & ~UCR1_SNDBRK; 851ab4382d2SGreg Kroah-Hartman 852ab4382d2SGreg Kroah-Hartman if (break_state != 0) 853ab4382d2SGreg Kroah-Hartman temp |= UCR1_SNDBRK; 854ab4382d2SGreg Kroah-Hartman 855ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR1); 856ab4382d2SGreg Kroah-Hartman 857ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 858ab4382d2SGreg Kroah-Hartman } 859ab4382d2SGreg Kroah-Hartman 860b4cdc8f6SHuang Shijie #define RX_BUF_SIZE (PAGE_SIZE) 861b4cdc8f6SHuang Shijie static void imx_rx_dma_done(struct imx_port *sport) 862b4cdc8f6SHuang Shijie { 863b4cdc8f6SHuang Shijie unsigned long temp; 86473631813SJiada Wang unsigned long flags; 86573631813SJiada Wang 86673631813SJiada Wang spin_lock_irqsave(&sport->port.lock, flags); 867b4cdc8f6SHuang Shijie 868*86a04ba6SLucas Stach /* re-enable interrupts to get notified when new symbols are incoming */ 869b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR1); 870b4cdc8f6SHuang Shijie temp |= UCR1_RRDYEN; 871b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR1); 872b4cdc8f6SHuang Shijie 873*86a04ba6SLucas Stach temp = readl(sport->port.membase + UCR2); 874*86a04ba6SLucas Stach temp |= UCR2_ATEN; 875*86a04ba6SLucas Stach writel(temp, sport->port.membase + UCR2); 876*86a04ba6SLucas Stach 877b4cdc8f6SHuang Shijie sport->dma_is_rxing = 0; 8789ce4f8f3SGreg Kroah-Hartman 8799ce4f8f3SGreg Kroah-Hartman /* Is the shutdown waiting for us? */ 8809ce4f8f3SGreg Kroah-Hartman if (waitqueue_active(&sport->dma_wait)) 8819ce4f8f3SGreg Kroah-Hartman wake_up(&sport->dma_wait); 88273631813SJiada Wang 88373631813SJiada Wang spin_unlock_irqrestore(&sport->port.lock, flags); 884b4cdc8f6SHuang Shijie } 885b4cdc8f6SHuang Shijie 886b4cdc8f6SHuang Shijie /* 887b4cdc8f6SHuang Shijie * There are three kinds of RX DMA interrupts(such as in the MX6Q): 888b4cdc8f6SHuang Shijie * [1] the RX DMA buffer is full. 889b4cdc8f6SHuang Shijie * [2] the Aging timer expires(wait for 8 bytes long) 890b4cdc8f6SHuang Shijie * [3] the Idle Condition Detect(enabled the UCR4_IDDMAEN). 891b4cdc8f6SHuang Shijie * 892b4cdc8f6SHuang Shijie * The [2] is trigger when a character was been sitting in the FIFO 893b4cdc8f6SHuang Shijie * meanwhile [3] can wait for 32 bytes long when the RX line is 894b4cdc8f6SHuang Shijie * on IDLE state and RxFIFO is empty. 895b4cdc8f6SHuang Shijie */ 896b4cdc8f6SHuang Shijie static void dma_rx_callback(void *data) 897b4cdc8f6SHuang Shijie { 898b4cdc8f6SHuang Shijie struct imx_port *sport = data; 899b4cdc8f6SHuang Shijie struct dma_chan *chan = sport->dma_chan_rx; 900b4cdc8f6SHuang Shijie struct scatterlist *sgl = &sport->rx_sgl; 9017cb92fd2SHuang Shijie struct tty_port *port = &sport->port.state->port; 902b4cdc8f6SHuang Shijie struct dma_tx_state state; 903b4cdc8f6SHuang Shijie enum dma_status status; 904b4cdc8f6SHuang Shijie unsigned int count; 905b4cdc8f6SHuang Shijie 906b4cdc8f6SHuang Shijie /* unmap it first */ 907b4cdc8f6SHuang Shijie dma_unmap_sg(sport->port.dev, sgl, 1, DMA_FROM_DEVICE); 908b4cdc8f6SHuang Shijie 909f0ef8834SHuang Shijie status = dmaengine_tx_status(chan, (dma_cookie_t)0, &state); 910b4cdc8f6SHuang Shijie count = RX_BUF_SIZE - state.residue; 911392bceedSPhilipp Zabel 912392bceedSPhilipp Zabel if (readl(sport->port.membase + USR2) & USR2_IDLE) { 913392bceedSPhilipp Zabel /* In condition [3] the SDMA counted up too early */ 914392bceedSPhilipp Zabel count--; 915392bceedSPhilipp Zabel 916392bceedSPhilipp Zabel writel(USR2_IDLE, sport->port.membase + USR2); 917392bceedSPhilipp Zabel } 918392bceedSPhilipp Zabel 919b4cdc8f6SHuang Shijie dev_dbg(sport->port.dev, "We get %d bytes.\n", count); 920b4cdc8f6SHuang Shijie 921b4cdc8f6SHuang Shijie if (count) { 9229b289932SManfred Schlaegl if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) { 9239b289932SManfred Schlaegl int bytes = tty_insert_flip_string(port, sport->rx_buf, 9249b289932SManfred Schlaegl count); 9259b289932SManfred Schlaegl 9269b289932SManfred Schlaegl if (bytes != count) 9279b289932SManfred Schlaegl sport->port.icount.buf_overrun++; 9289b289932SManfred Schlaegl } 9297cb92fd2SHuang Shijie tty_flip_buffer_push(port); 9307cb92fd2SHuang Shijie 9317cb92fd2SHuang Shijie start_rx_dma(sport); 932ee5e7c10SRobin Gong } else if (readl(sport->port.membase + USR2) & USR2_RDR) { 933ee5e7c10SRobin Gong /* 934ee5e7c10SRobin Gong * start rx_dma directly once data in RXFIFO, more efficient 935ee5e7c10SRobin Gong * than before: 936ee5e7c10SRobin Gong * 1. call imx_rx_dma_done to stop dma if no data received 937ee5e7c10SRobin Gong * 2. wait next RDR interrupt to start dma transfer. 938ee5e7c10SRobin Gong */ 939ee5e7c10SRobin Gong start_rx_dma(sport); 940ee5e7c10SRobin Gong } else { 941ee5e7c10SRobin Gong /* 942ee5e7c10SRobin Gong * stop dma to prevent too many IDLE event trigged if no data 943ee5e7c10SRobin Gong * in RXFIFO 944ee5e7c10SRobin Gong */ 945b4cdc8f6SHuang Shijie imx_rx_dma_done(sport); 946b4cdc8f6SHuang Shijie } 947ee5e7c10SRobin Gong } 948b4cdc8f6SHuang Shijie 949b4cdc8f6SHuang Shijie static int start_rx_dma(struct imx_port *sport) 950b4cdc8f6SHuang Shijie { 951b4cdc8f6SHuang Shijie struct scatterlist *sgl = &sport->rx_sgl; 952b4cdc8f6SHuang Shijie struct dma_chan *chan = sport->dma_chan_rx; 953b4cdc8f6SHuang Shijie struct device *dev = sport->port.dev; 954b4cdc8f6SHuang Shijie struct dma_async_tx_descriptor *desc; 955b4cdc8f6SHuang Shijie int ret; 956b4cdc8f6SHuang Shijie 957b4cdc8f6SHuang Shijie sg_init_one(sgl, sport->rx_buf, RX_BUF_SIZE); 958b4cdc8f6SHuang Shijie ret = dma_map_sg(dev, sgl, 1, DMA_FROM_DEVICE); 959b4cdc8f6SHuang Shijie if (ret == 0) { 960b4cdc8f6SHuang Shijie dev_err(dev, "DMA mapping error for RX.\n"); 961b4cdc8f6SHuang Shijie return -EINVAL; 962b4cdc8f6SHuang Shijie } 963b4cdc8f6SHuang Shijie desc = dmaengine_prep_slave_sg(chan, sgl, 1, DMA_DEV_TO_MEM, 964b4cdc8f6SHuang Shijie DMA_PREP_INTERRUPT); 965b4cdc8f6SHuang Shijie if (!desc) { 96624649821SDirk Behme dma_unmap_sg(dev, sgl, 1, DMA_FROM_DEVICE); 967b4cdc8f6SHuang Shijie dev_err(dev, "We cannot prepare for the RX slave dma!\n"); 968b4cdc8f6SHuang Shijie return -EINVAL; 969b4cdc8f6SHuang Shijie } 970b4cdc8f6SHuang Shijie desc->callback = dma_rx_callback; 971b4cdc8f6SHuang Shijie desc->callback_param = sport; 972b4cdc8f6SHuang Shijie 973b4cdc8f6SHuang Shijie dev_dbg(dev, "RX: prepare for the DMA.\n"); 974b4cdc8f6SHuang Shijie dmaengine_submit(desc); 975b4cdc8f6SHuang Shijie dma_async_issue_pending(chan); 976b4cdc8f6SHuang Shijie return 0; 977b4cdc8f6SHuang Shijie } 978b4cdc8f6SHuang Shijie 979cc32382dSLucas Stach #define TXTL_DEFAULT 2 /* reset default */ 980cc32382dSLucas Stach #define RXTL_DEFAULT 1 /* reset default */ 981cc32382dSLucas Stach 982cc32382dSLucas Stach static void imx_setup_ufcr(struct imx_port *sport, 983cc32382dSLucas Stach unsigned char txwl, unsigned char rxwl) 984cc32382dSLucas Stach { 985cc32382dSLucas Stach unsigned int val; 986cc32382dSLucas Stach 987cc32382dSLucas Stach /* set receiver / transmitter trigger level */ 988cc32382dSLucas Stach val = readl(sport->port.membase + UFCR) & (UFCR_RFDIV | UFCR_DCEDTE); 989cc32382dSLucas Stach val |= txwl << UFCR_TXTL_SHF | rxwl; 990cc32382dSLucas Stach writel(val, sport->port.membase + UFCR); 991cc32382dSLucas Stach } 992cc32382dSLucas Stach 993b4cdc8f6SHuang Shijie static void imx_uart_dma_exit(struct imx_port *sport) 994b4cdc8f6SHuang Shijie { 995b4cdc8f6SHuang Shijie if (sport->dma_chan_rx) { 996b4cdc8f6SHuang Shijie dma_release_channel(sport->dma_chan_rx); 997b4cdc8f6SHuang Shijie sport->dma_chan_rx = NULL; 998b4cdc8f6SHuang Shijie 999b4cdc8f6SHuang Shijie kfree(sport->rx_buf); 1000b4cdc8f6SHuang Shijie sport->rx_buf = NULL; 1001b4cdc8f6SHuang Shijie } 1002b4cdc8f6SHuang Shijie 1003b4cdc8f6SHuang Shijie if (sport->dma_chan_tx) { 1004b4cdc8f6SHuang Shijie dma_release_channel(sport->dma_chan_tx); 1005b4cdc8f6SHuang Shijie sport->dma_chan_tx = NULL; 1006b4cdc8f6SHuang Shijie } 1007b4cdc8f6SHuang Shijie 1008b4cdc8f6SHuang Shijie sport->dma_is_inited = 0; 1009b4cdc8f6SHuang Shijie } 1010b4cdc8f6SHuang Shijie 1011b4cdc8f6SHuang Shijie static int imx_uart_dma_init(struct imx_port *sport) 1012b4cdc8f6SHuang Shijie { 1013b09c74aeSHuang Shijie struct dma_slave_config slave_config = {}; 1014b4cdc8f6SHuang Shijie struct device *dev = sport->port.dev; 1015b4cdc8f6SHuang Shijie int ret; 1016b4cdc8f6SHuang Shijie 1017b4cdc8f6SHuang Shijie /* Prepare for RX : */ 1018b4cdc8f6SHuang Shijie sport->dma_chan_rx = dma_request_slave_channel(dev, "rx"); 1019b4cdc8f6SHuang Shijie if (!sport->dma_chan_rx) { 1020b4cdc8f6SHuang Shijie dev_dbg(dev, "cannot get the DMA channel.\n"); 1021b4cdc8f6SHuang Shijie ret = -EINVAL; 1022b4cdc8f6SHuang Shijie goto err; 1023b4cdc8f6SHuang Shijie } 1024b4cdc8f6SHuang Shijie 1025b4cdc8f6SHuang Shijie slave_config.direction = DMA_DEV_TO_MEM; 1026b4cdc8f6SHuang Shijie slave_config.src_addr = sport->port.mapbase + URXD0; 1027b4cdc8f6SHuang Shijie slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; 1028cc32382dSLucas Stach slave_config.src_maxburst = RXTL_DEFAULT; 1029b4cdc8f6SHuang Shijie ret = dmaengine_slave_config(sport->dma_chan_rx, &slave_config); 1030b4cdc8f6SHuang Shijie if (ret) { 1031b4cdc8f6SHuang Shijie dev_err(dev, "error in RX dma configuration.\n"); 1032b4cdc8f6SHuang Shijie goto err; 1033b4cdc8f6SHuang Shijie } 1034b4cdc8f6SHuang Shijie 1035b4cdc8f6SHuang Shijie sport->rx_buf = kzalloc(PAGE_SIZE, GFP_KERNEL); 1036b4cdc8f6SHuang Shijie if (!sport->rx_buf) { 1037b4cdc8f6SHuang Shijie ret = -ENOMEM; 1038b4cdc8f6SHuang Shijie goto err; 1039b4cdc8f6SHuang Shijie } 1040b4cdc8f6SHuang Shijie 1041b4cdc8f6SHuang Shijie /* Prepare for TX : */ 1042b4cdc8f6SHuang Shijie sport->dma_chan_tx = dma_request_slave_channel(dev, "tx"); 1043b4cdc8f6SHuang Shijie if (!sport->dma_chan_tx) { 1044b4cdc8f6SHuang Shijie dev_err(dev, "cannot get the TX DMA channel!\n"); 1045b4cdc8f6SHuang Shijie ret = -EINVAL; 1046b4cdc8f6SHuang Shijie goto err; 1047b4cdc8f6SHuang Shijie } 1048b4cdc8f6SHuang Shijie 1049b4cdc8f6SHuang Shijie slave_config.direction = DMA_MEM_TO_DEV; 1050b4cdc8f6SHuang Shijie slave_config.dst_addr = sport->port.mapbase + URTX0; 1051b4cdc8f6SHuang Shijie slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; 1052cc32382dSLucas Stach slave_config.dst_maxburst = TXTL_DEFAULT; 1053b4cdc8f6SHuang Shijie ret = dmaengine_slave_config(sport->dma_chan_tx, &slave_config); 1054b4cdc8f6SHuang Shijie if (ret) { 1055b4cdc8f6SHuang Shijie dev_err(dev, "error in TX dma configuration."); 1056b4cdc8f6SHuang Shijie goto err; 1057b4cdc8f6SHuang Shijie } 1058b4cdc8f6SHuang Shijie 1059b4cdc8f6SHuang Shijie sport->dma_is_inited = 1; 1060b4cdc8f6SHuang Shijie 1061b4cdc8f6SHuang Shijie return 0; 1062b4cdc8f6SHuang Shijie err: 1063b4cdc8f6SHuang Shijie imx_uart_dma_exit(sport); 1064b4cdc8f6SHuang Shijie return ret; 1065b4cdc8f6SHuang Shijie } 1066b4cdc8f6SHuang Shijie 1067b4cdc8f6SHuang Shijie static void imx_enable_dma(struct imx_port *sport) 1068b4cdc8f6SHuang Shijie { 1069b4cdc8f6SHuang Shijie unsigned long temp; 1070b4cdc8f6SHuang Shijie 10719ce4f8f3SGreg Kroah-Hartman init_waitqueue_head(&sport->dma_wait); 10729ce4f8f3SGreg Kroah-Hartman 1073b4cdc8f6SHuang Shijie /* set UCR1 */ 1074b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR1); 1075b4cdc8f6SHuang Shijie temp |= UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN | 1076b4cdc8f6SHuang Shijie /* wait for 32 idle frames for IDDMA interrupt */ 1077b4cdc8f6SHuang Shijie UCR1_ICD_REG(3); 1078b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR1); 1079b4cdc8f6SHuang Shijie 1080*86a04ba6SLucas Stach temp = readl(sport->port.membase + UCR2); 1081*86a04ba6SLucas Stach temp |= UCR2_ATEN; 1082*86a04ba6SLucas Stach writel(temp, sport->port.membase + UCR2); 1083*86a04ba6SLucas Stach 1084b4cdc8f6SHuang Shijie /* set UCR4 */ 1085b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR4); 1086b4cdc8f6SHuang Shijie temp |= UCR4_IDDMAEN; 1087b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR4); 1088b4cdc8f6SHuang Shijie 1089b4cdc8f6SHuang Shijie sport->dma_is_enabled = 1; 1090b4cdc8f6SHuang Shijie } 1091b4cdc8f6SHuang Shijie 1092b4cdc8f6SHuang Shijie static void imx_disable_dma(struct imx_port *sport) 1093b4cdc8f6SHuang Shijie { 1094b4cdc8f6SHuang Shijie unsigned long temp; 1095b4cdc8f6SHuang Shijie 1096b4cdc8f6SHuang Shijie /* clear UCR1 */ 1097b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR1); 1098b4cdc8f6SHuang Shijie temp &= ~(UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN); 1099b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR1); 1100b4cdc8f6SHuang Shijie 1101b4cdc8f6SHuang Shijie /* clear UCR2 */ 1102b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR2); 1103*86a04ba6SLucas Stach temp &= ~(UCR2_CTSC | UCR2_CTS | UCR2_ATEN); 1104b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR2); 1105b4cdc8f6SHuang Shijie 1106b4cdc8f6SHuang Shijie /* clear UCR4 */ 1107b4cdc8f6SHuang Shijie temp = readl(sport->port.membase + UCR4); 1108b4cdc8f6SHuang Shijie temp &= ~UCR4_IDDMAEN; 1109b4cdc8f6SHuang Shijie writel(temp, sport->port.membase + UCR4); 1110b4cdc8f6SHuang Shijie 1111b4cdc8f6SHuang Shijie sport->dma_is_enabled = 0; 1112b4cdc8f6SHuang Shijie } 1113b4cdc8f6SHuang Shijie 1114ab4382d2SGreg Kroah-Hartman /* half the RX buffer size */ 1115ab4382d2SGreg Kroah-Hartman #define CTSTL 16 1116ab4382d2SGreg Kroah-Hartman 1117ab4382d2SGreg Kroah-Hartman static int imx_startup(struct uart_port *port) 1118ab4382d2SGreg Kroah-Hartman { 1119ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1120458e2c82SFabio Estevam int retval, i; 1121ab4382d2SGreg Kroah-Hartman unsigned long flags, temp; 1122ab4382d2SGreg Kroah-Hartman 112328eb4274SHuang Shijie retval = clk_prepare_enable(sport->clk_per); 112428eb4274SHuang Shijie if (retval) 1125cb0f0a5fSFabio Estevam return retval; 112628eb4274SHuang Shijie retval = clk_prepare_enable(sport->clk_ipg); 11270c375501SHuang Shijie if (retval) { 11280c375501SHuang Shijie clk_disable_unprepare(sport->clk_per); 1129cb0f0a5fSFabio Estevam return retval; 11300c375501SHuang Shijie } 113128eb4274SHuang Shijie 1132cc32382dSLucas Stach imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); 1133ab4382d2SGreg Kroah-Hartman 1134ab4382d2SGreg Kroah-Hartman /* disable the DREN bit (Data Ready interrupt enable) before 1135ab4382d2SGreg Kroah-Hartman * requesting IRQs 1136ab4382d2SGreg Kroah-Hartman */ 1137ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR4); 1138ab4382d2SGreg Kroah-Hartman 1139ab4382d2SGreg Kroah-Hartman /* set the trigger level for CTS */ 1140ab4382d2SGreg Kroah-Hartman temp &= ~(UCR4_CTSTL_MASK << UCR4_CTSTL_SHF); 1141ab4382d2SGreg Kroah-Hartman temp |= CTSTL << UCR4_CTSTL_SHF; 1142ab4382d2SGreg Kroah-Hartman 1143ab4382d2SGreg Kroah-Hartman writel(temp & ~UCR4_DREN, sport->port.membase + UCR4); 1144ab4382d2SGreg Kroah-Hartman 114553794183SJiada Wang spin_lock_irqsave(&sport->port.lock, flags); 1146772f8991SHuang Shijie /* Reset fifo's and state machines */ 1147458e2c82SFabio Estevam i = 100; 1148458e2c82SFabio Estevam 1149458e2c82SFabio Estevam temp = readl(sport->port.membase + UCR2); 1150458e2c82SFabio Estevam temp &= ~UCR2_SRST; 1151458e2c82SFabio Estevam writel(temp, sport->port.membase + UCR2); 1152458e2c82SFabio Estevam 1153458e2c82SFabio Estevam while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0)) 1154458e2c82SFabio Estevam udelay(1); 1155ab4382d2SGreg Kroah-Hartman 1156ab4382d2SGreg Kroah-Hartman /* 1157ab4382d2SGreg Kroah-Hartman * Finally, clear and enable interrupts 1158ab4382d2SGreg Kroah-Hartman */ 1159ab4382d2SGreg Kroah-Hartman writel(USR1_RTSD, sport->port.membase + USR1); 116091555ce9SUwe Kleine-König writel(USR2_ORE, sport->port.membase + USR2); 1161ab4382d2SGreg Kroah-Hartman 1162ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1); 1163ab4382d2SGreg Kroah-Hartman temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN; 1164ab4382d2SGreg Kroah-Hartman 1165ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR1); 1166ab4382d2SGreg Kroah-Hartman 11676f026d6bSJiada Wang temp = readl(sport->port.membase + UCR4); 11686f026d6bSJiada Wang temp |= UCR4_OREN; 11696f026d6bSJiada Wang writel(temp, sport->port.membase + UCR4); 11706f026d6bSJiada Wang 1171ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR2); 1172ab4382d2SGreg Kroah-Hartman temp |= (UCR2_RXEN | UCR2_TXEN); 1173bff09b09SLucas Stach if (!sport->have_rtscts) 1174bff09b09SLucas Stach temp |= UCR2_IRTS; 1175ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR2); 1176ab4382d2SGreg Kroah-Hartman 1177a496e628SHuang Shijie if (!is_imx1_uart(sport)) { 1178ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR3); 1179b38cb7d2SFabio Estevam temp |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP; 1180ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR3); 1181ab4382d2SGreg Kroah-Hartman } 1182ab4382d2SGreg Kroah-Hartman 1183ab4382d2SGreg Kroah-Hartman /* 1184ab4382d2SGreg Kroah-Hartman * Enable modem status interrupts 1185ab4382d2SGreg Kroah-Hartman */ 1186ab4382d2SGreg Kroah-Hartman imx_enable_ms(&sport->port); 1187ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 1188ab4382d2SGreg Kroah-Hartman 1189ab4382d2SGreg Kroah-Hartman return 0; 1190ab4382d2SGreg Kroah-Hartman } 1191ab4382d2SGreg Kroah-Hartman 1192ab4382d2SGreg Kroah-Hartman static void imx_shutdown(struct uart_port *port) 1193ab4382d2SGreg Kroah-Hartman { 1194ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1195ab4382d2SGreg Kroah-Hartman unsigned long temp; 11969ec1882dSXinyu Chen unsigned long flags; 1197ab4382d2SGreg Kroah-Hartman 1198b4cdc8f6SHuang Shijie if (sport->dma_is_enabled) { 1199a4688bcdSHuang Shijie int ret; 1200a4688bcdSHuang Shijie 12019ce4f8f3SGreg Kroah-Hartman /* We have to wait for the DMA to finish. */ 1202a4688bcdSHuang Shijie ret = wait_event_interruptible(sport->dma_wait, 12039ce4f8f3SGreg Kroah-Hartman !sport->dma_is_rxing && !sport->dma_is_txing); 1204a4688bcdSHuang Shijie if (ret != 0) { 1205a4688bcdSHuang Shijie sport->dma_is_rxing = 0; 1206a4688bcdSHuang Shijie sport->dma_is_txing = 0; 1207a4688bcdSHuang Shijie dmaengine_terminate_all(sport->dma_chan_tx); 1208a4688bcdSHuang Shijie dmaengine_terminate_all(sport->dma_chan_rx); 1209a4688bcdSHuang Shijie } 121073631813SJiada Wang spin_lock_irqsave(&sport->port.lock, flags); 1211a4688bcdSHuang Shijie imx_stop_tx(port); 1212b4cdc8f6SHuang Shijie imx_stop_rx(port); 1213b4cdc8f6SHuang Shijie imx_disable_dma(sport); 121473631813SJiada Wang spin_unlock_irqrestore(&sport->port.lock, flags); 1215b4cdc8f6SHuang Shijie imx_uart_dma_exit(sport); 1216b4cdc8f6SHuang Shijie } 1217b4cdc8f6SHuang Shijie 12189ec1882dSXinyu Chen spin_lock_irqsave(&sport->port.lock, flags); 1219ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR2); 1220ab4382d2SGreg Kroah-Hartman temp &= ~(UCR2_TXEN); 1221ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR2); 12229ec1882dSXinyu Chen spin_unlock_irqrestore(&sport->port.lock, flags); 1223ab4382d2SGreg Kroah-Hartman 1224ab4382d2SGreg Kroah-Hartman /* 1225ab4382d2SGreg Kroah-Hartman * Stop our timer. 1226ab4382d2SGreg Kroah-Hartman */ 1227ab4382d2SGreg Kroah-Hartman del_timer_sync(&sport->timer); 1228ab4382d2SGreg Kroah-Hartman 1229ab4382d2SGreg Kroah-Hartman /* 1230ab4382d2SGreg Kroah-Hartman * Disable all interrupts, port and break condition. 1231ab4382d2SGreg Kroah-Hartman */ 1232ab4382d2SGreg Kroah-Hartman 12339ec1882dSXinyu Chen spin_lock_irqsave(&sport->port.lock, flags); 1234ab4382d2SGreg Kroah-Hartman temp = readl(sport->port.membase + UCR1); 1235ab4382d2SGreg Kroah-Hartman temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN); 1236ab4382d2SGreg Kroah-Hartman 1237ab4382d2SGreg Kroah-Hartman writel(temp, sport->port.membase + UCR1); 12389ec1882dSXinyu Chen spin_unlock_irqrestore(&sport->port.lock, flags); 123928eb4274SHuang Shijie 124028eb4274SHuang Shijie clk_disable_unprepare(sport->clk_per); 124128eb4274SHuang Shijie clk_disable_unprepare(sport->clk_ipg); 1242ab4382d2SGreg Kroah-Hartman } 1243ab4382d2SGreg Kroah-Hartman 1244eb56b7edSHuang Shijie static void imx_flush_buffer(struct uart_port *port) 1245eb56b7edSHuang Shijie { 1246eb56b7edSHuang Shijie struct imx_port *sport = (struct imx_port *)port; 124782e86ae9SDirk Behme struct scatterlist *sgl = &sport->tx_sgl[0]; 1248a2c718ceSDirk Behme unsigned long temp; 12494f86a95dSFabio Estevam int i = 100, ubir, ubmr, uts; 1250eb56b7edSHuang Shijie 125182e86ae9SDirk Behme if (!sport->dma_chan_tx) 125282e86ae9SDirk Behme return; 125382e86ae9SDirk Behme 1254eb56b7edSHuang Shijie sport->tx_bytes = 0; 1255eb56b7edSHuang Shijie dmaengine_terminate_all(sport->dma_chan_tx); 125682e86ae9SDirk Behme if (sport->dma_is_txing) { 125782e86ae9SDirk Behme dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, 125882e86ae9SDirk Behme DMA_TO_DEVICE); 1259a2c718ceSDirk Behme temp = readl(sport->port.membase + UCR1); 1260a2c718ceSDirk Behme temp &= ~UCR1_TDMAEN; 1261a2c718ceSDirk Behme writel(temp, sport->port.membase + UCR1); 126282e86ae9SDirk Behme sport->dma_is_txing = false; 1263eb56b7edSHuang Shijie } 1264934084a9SFabio Estevam 1265934084a9SFabio Estevam /* 1266934084a9SFabio Estevam * According to the Reference Manual description of the UART SRST bit: 1267934084a9SFabio Estevam * "Reset the transmit and receive state machines, 1268934084a9SFabio Estevam * all FIFOs and register USR1, USR2, UBIR, UBMR, UBRC, URXD, UTXD 1269934084a9SFabio Estevam * and UTS[6-3]". As we don't need to restore the old values from 1270934084a9SFabio Estevam * USR1, USR2, URXD, UTXD, only save/restore the other four registers 1271934084a9SFabio Estevam */ 1272934084a9SFabio Estevam ubir = readl(sport->port.membase + UBIR); 1273934084a9SFabio Estevam ubmr = readl(sport->port.membase + UBMR); 1274934084a9SFabio Estevam uts = readl(sport->port.membase + IMX21_UTS); 1275934084a9SFabio Estevam 1276934084a9SFabio Estevam temp = readl(sport->port.membase + UCR2); 1277934084a9SFabio Estevam temp &= ~UCR2_SRST; 1278934084a9SFabio Estevam writel(temp, sport->port.membase + UCR2); 1279934084a9SFabio Estevam 1280934084a9SFabio Estevam while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0)) 1281934084a9SFabio Estevam udelay(1); 1282934084a9SFabio Estevam 1283934084a9SFabio Estevam /* Restore the registers */ 1284934084a9SFabio Estevam writel(ubir, sport->port.membase + UBIR); 1285934084a9SFabio Estevam writel(ubmr, sport->port.membase + UBMR); 1286934084a9SFabio Estevam writel(uts, sport->port.membase + IMX21_UTS); 1287eb56b7edSHuang Shijie } 1288eb56b7edSHuang Shijie 1289ab4382d2SGreg Kroah-Hartman static void 1290ab4382d2SGreg Kroah-Hartman imx_set_termios(struct uart_port *port, struct ktermios *termios, 1291ab4382d2SGreg Kroah-Hartman struct ktermios *old) 1292ab4382d2SGreg Kroah-Hartman { 1293ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1294ab4382d2SGreg Kroah-Hartman unsigned long flags; 1295*86a04ba6SLucas Stach unsigned int ucr2, old_ucr1, old_ucr2, baud, quot; 1296ab4382d2SGreg Kroah-Hartman unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; 1297ab4382d2SGreg Kroah-Hartman unsigned int div, ufcr; 1298ab4382d2SGreg Kroah-Hartman unsigned long num, denom; 1299ab4382d2SGreg Kroah-Hartman uint64_t tdiv64; 1300ab4382d2SGreg Kroah-Hartman 1301ab4382d2SGreg Kroah-Hartman /* 1302ab4382d2SGreg Kroah-Hartman * We only support CS7 and CS8. 1303ab4382d2SGreg Kroah-Hartman */ 1304ab4382d2SGreg Kroah-Hartman while ((termios->c_cflag & CSIZE) != CS7 && 1305ab4382d2SGreg Kroah-Hartman (termios->c_cflag & CSIZE) != CS8) { 1306ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CSIZE; 1307ab4382d2SGreg Kroah-Hartman termios->c_cflag |= old_csize; 1308ab4382d2SGreg Kroah-Hartman old_csize = CS8; 1309ab4382d2SGreg Kroah-Hartman } 1310ab4382d2SGreg Kroah-Hartman 1311ab4382d2SGreg Kroah-Hartman if ((termios->c_cflag & CSIZE) == CS8) 1312ab4382d2SGreg Kroah-Hartman ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS; 1313ab4382d2SGreg Kroah-Hartman else 1314ab4382d2SGreg Kroah-Hartman ucr2 = UCR2_SRST | UCR2_IRTS; 1315ab4382d2SGreg Kroah-Hartman 1316ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) { 1317ab4382d2SGreg Kroah-Hartman if (sport->have_rtscts) { 1318ab4382d2SGreg Kroah-Hartman ucr2 &= ~UCR2_IRTS; 131917b8f2a3SUwe Kleine-König 132012fe59f9SFabio Estevam if (port->rs485.flags & SER_RS485_ENABLED) { 132117b8f2a3SUwe Kleine-König /* 132217b8f2a3SUwe Kleine-König * RTS is mandatory for rs485 operation, so keep 132317b8f2a3SUwe Kleine-König * it under manual control and keep transmitter 132417b8f2a3SUwe Kleine-König * disabled. 132517b8f2a3SUwe Kleine-König */ 132617b8f2a3SUwe Kleine-König if (!(port->rs485.flags & 132717b8f2a3SUwe Kleine-König SER_RS485_RTS_AFTER_SEND)) 132817b8f2a3SUwe Kleine-König ucr2 |= UCR2_CTS; 132912fe59f9SFabio Estevam } else { 1330ab4382d2SGreg Kroah-Hartman ucr2 |= UCR2_CTSC; 133112fe59f9SFabio Estevam } 1332907eda32SDavid Jander 1333907eda32SDavid Jander /* Can we enable the DMA support? */ 1334907eda32SDavid Jander if (is_imx6q_uart(sport) && !uart_console(port) 1335907eda32SDavid Jander && !sport->dma_is_inited) 1336907eda32SDavid Jander imx_uart_dma_init(sport); 1337ab4382d2SGreg Kroah-Hartman } else { 1338ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CRTSCTS; 1339ab4382d2SGreg Kroah-Hartman } 134017b8f2a3SUwe Kleine-König } else if (port->rs485.flags & SER_RS485_ENABLED) 134117b8f2a3SUwe Kleine-König /* disable transmitter */ 134217b8f2a3SUwe Kleine-König if (!(port->rs485.flags & SER_RS485_RTS_AFTER_SEND)) 134317b8f2a3SUwe Kleine-König ucr2 |= UCR2_CTS; 1344ab4382d2SGreg Kroah-Hartman 1345ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CSTOPB) 1346ab4382d2SGreg Kroah-Hartman ucr2 |= UCR2_STPB; 1347ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & PARENB) { 1348ab4382d2SGreg Kroah-Hartman ucr2 |= UCR2_PREN; 1349ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & PARODD) 1350ab4382d2SGreg Kroah-Hartman ucr2 |= UCR2_PROE; 1351ab4382d2SGreg Kroah-Hartman } 1352ab4382d2SGreg Kroah-Hartman 1353995234daSEric Miao del_timer_sync(&sport->timer); 1354995234daSEric Miao 1355ab4382d2SGreg Kroah-Hartman /* 1356ab4382d2SGreg Kroah-Hartman * Ask the core to calculate the divisor for us. 1357ab4382d2SGreg Kroah-Hartman */ 1358ab4382d2SGreg Kroah-Hartman baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16); 1359ab4382d2SGreg Kroah-Hartman quot = uart_get_divisor(port, baud); 1360ab4382d2SGreg Kroah-Hartman 1361ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&sport->port.lock, flags); 1362ab4382d2SGreg Kroah-Hartman 1363ab4382d2SGreg Kroah-Hartman sport->port.read_status_mask = 0; 1364ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & INPCK) 1365ab4382d2SGreg Kroah-Hartman sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR); 1366ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & (BRKINT | PARMRK)) 1367ab4382d2SGreg Kroah-Hartman sport->port.read_status_mask |= URXD_BRK; 1368ab4382d2SGreg Kroah-Hartman 1369ab4382d2SGreg Kroah-Hartman /* 1370ab4382d2SGreg Kroah-Hartman * Characters to ignore 1371ab4382d2SGreg Kroah-Hartman */ 1372ab4382d2SGreg Kroah-Hartman sport->port.ignore_status_mask = 0; 1373ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 1374865cea85SEric Nelson sport->port.ignore_status_mask |= URXD_PRERR | URXD_FRMERR; 1375ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNBRK) { 1376ab4382d2SGreg Kroah-Hartman sport->port.ignore_status_mask |= URXD_BRK; 1377ab4382d2SGreg Kroah-Hartman /* 1378ab4382d2SGreg Kroah-Hartman * If we're ignoring parity and break indicators, 1379ab4382d2SGreg Kroah-Hartman * ignore overruns too (for real raw support). 1380ab4382d2SGreg Kroah-Hartman */ 1381ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 1382ab4382d2SGreg Kroah-Hartman sport->port.ignore_status_mask |= URXD_OVRRUN; 1383ab4382d2SGreg Kroah-Hartman } 1384ab4382d2SGreg Kroah-Hartman 138555d8693aSJiada Wang if ((termios->c_cflag & CREAD) == 0) 138655d8693aSJiada Wang sport->port.ignore_status_mask |= URXD_DUMMY_READ; 138755d8693aSJiada Wang 1388ab4382d2SGreg Kroah-Hartman /* 1389ab4382d2SGreg Kroah-Hartman * Update the per-port timeout. 1390ab4382d2SGreg Kroah-Hartman */ 1391ab4382d2SGreg Kroah-Hartman uart_update_timeout(port, termios->c_cflag, baud); 1392ab4382d2SGreg Kroah-Hartman 1393ab4382d2SGreg Kroah-Hartman /* 1394ab4382d2SGreg Kroah-Hartman * disable interrupts and drain transmitter 1395ab4382d2SGreg Kroah-Hartman */ 1396ab4382d2SGreg Kroah-Hartman old_ucr1 = readl(sport->port.membase + UCR1); 1397ab4382d2SGreg Kroah-Hartman writel(old_ucr1 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN), 1398ab4382d2SGreg Kroah-Hartman sport->port.membase + UCR1); 1399ab4382d2SGreg Kroah-Hartman 1400ab4382d2SGreg Kroah-Hartman while (!(readl(sport->port.membase + USR2) & USR2_TXDC)) 1401ab4382d2SGreg Kroah-Hartman barrier(); 1402ab4382d2SGreg Kroah-Hartman 1403ab4382d2SGreg Kroah-Hartman /* then, disable everything */ 1404*86a04ba6SLucas Stach old_ucr2 = readl(sport->port.membase + UCR2); 1405*86a04ba6SLucas Stach writel(old_ucr2 & ~(UCR2_TXEN | UCR2_RXEN), 1406ab4382d2SGreg Kroah-Hartman sport->port.membase + UCR2); 1407*86a04ba6SLucas Stach old_ucr2 &= (UCR2_TXEN | UCR2_RXEN | UCR2_ATEN); 1408ab4382d2SGreg Kroah-Hartman 140909bd00f6SHubert Feurstein /* custom-baudrate handling */ 141009bd00f6SHubert Feurstein div = sport->port.uartclk / (baud * 16); 141109bd00f6SHubert Feurstein if (baud == 38400 && quot != div) 141209bd00f6SHubert Feurstein baud = sport->port.uartclk / (quot * 16); 141309bd00f6SHubert Feurstein 1414ab4382d2SGreg Kroah-Hartman div = sport->port.uartclk / (baud * 16); 1415ab4382d2SGreg Kroah-Hartman if (div > 7) 1416ab4382d2SGreg Kroah-Hartman div = 7; 1417ab4382d2SGreg Kroah-Hartman if (!div) 1418ab4382d2SGreg Kroah-Hartman div = 1; 1419ab4382d2SGreg Kroah-Hartman 1420ab4382d2SGreg Kroah-Hartman rational_best_approximation(16 * div * baud, sport->port.uartclk, 1421ab4382d2SGreg Kroah-Hartman 1 << 16, 1 << 16, &num, &denom); 1422ab4382d2SGreg Kroah-Hartman 1423ab4382d2SGreg Kroah-Hartman tdiv64 = sport->port.uartclk; 1424ab4382d2SGreg Kroah-Hartman tdiv64 *= num; 1425ab4382d2SGreg Kroah-Hartman do_div(tdiv64, denom * 16 * div); 1426ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 1427ab4382d2SGreg Kroah-Hartman (speed_t)tdiv64, (speed_t)tdiv64); 1428ab4382d2SGreg Kroah-Hartman 1429ab4382d2SGreg Kroah-Hartman num -= 1; 1430ab4382d2SGreg Kroah-Hartman denom -= 1; 1431ab4382d2SGreg Kroah-Hartman 1432ab4382d2SGreg Kroah-Hartman ufcr = readl(sport->port.membase + UFCR); 1433ab4382d2SGreg Kroah-Hartman ufcr = (ufcr & (~UFCR_RFDIV)) | UFCR_RFDIV_REG(div); 143420ff2fe6SHuang Shijie if (sport->dte_mode) 143520ff2fe6SHuang Shijie ufcr |= UFCR_DCEDTE; 1436ab4382d2SGreg Kroah-Hartman writel(ufcr, sport->port.membase + UFCR); 1437ab4382d2SGreg Kroah-Hartman 1438ab4382d2SGreg Kroah-Hartman writel(num, sport->port.membase + UBIR); 1439ab4382d2SGreg Kroah-Hartman writel(denom, sport->port.membase + UBMR); 1440ab4382d2SGreg Kroah-Hartman 1441a496e628SHuang Shijie if (!is_imx1_uart(sport)) 1442ab4382d2SGreg Kroah-Hartman writel(sport->port.uartclk / div / 1000, 1443fe6b540aSShawn Guo sport->port.membase + IMX21_ONEMS); 1444ab4382d2SGreg Kroah-Hartman 1445ab4382d2SGreg Kroah-Hartman writel(old_ucr1, sport->port.membase + UCR1); 1446ab4382d2SGreg Kroah-Hartman 1447ab4382d2SGreg Kroah-Hartman /* set the parity, stop bits and data size */ 1448*86a04ba6SLucas Stach writel(ucr2 | old_ucr2, sport->port.membase + UCR2); 1449ab4382d2SGreg Kroah-Hartman 1450ab4382d2SGreg Kroah-Hartman if (UART_ENABLE_MS(&sport->port, termios->c_cflag)) 1451ab4382d2SGreg Kroah-Hartman imx_enable_ms(&sport->port); 1452ab4382d2SGreg Kroah-Hartman 1453907eda32SDavid Jander if (sport->dma_is_inited && !sport->dma_is_enabled) 1454907eda32SDavid Jander imx_enable_dma(sport); 1455ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&sport->port.lock, flags); 1456ab4382d2SGreg Kroah-Hartman } 1457ab4382d2SGreg Kroah-Hartman 1458ab4382d2SGreg Kroah-Hartman static const char *imx_type(struct uart_port *port) 1459ab4382d2SGreg Kroah-Hartman { 1460ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1461ab4382d2SGreg Kroah-Hartman 1462ab4382d2SGreg Kroah-Hartman return sport->port.type == PORT_IMX ? "IMX" : NULL; 1463ab4382d2SGreg Kroah-Hartman } 1464ab4382d2SGreg Kroah-Hartman 1465ab4382d2SGreg Kroah-Hartman /* 1466ab4382d2SGreg Kroah-Hartman * Configure/autoconfigure the port. 1467ab4382d2SGreg Kroah-Hartman */ 1468ab4382d2SGreg Kroah-Hartman static void imx_config_port(struct uart_port *port, int flags) 1469ab4382d2SGreg Kroah-Hartman { 1470ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1471ab4382d2SGreg Kroah-Hartman 1472da82f997SAlexander Shiyan if (flags & UART_CONFIG_TYPE) 1473ab4382d2SGreg Kroah-Hartman sport->port.type = PORT_IMX; 1474ab4382d2SGreg Kroah-Hartman } 1475ab4382d2SGreg Kroah-Hartman 1476ab4382d2SGreg Kroah-Hartman /* 1477ab4382d2SGreg Kroah-Hartman * Verify the new serial_struct (for TIOCSSERIAL). 1478ab4382d2SGreg Kroah-Hartman * The only change we allow are to the flags and type, and 1479ab4382d2SGreg Kroah-Hartman * even then only between PORT_IMX and PORT_UNKNOWN 1480ab4382d2SGreg Kroah-Hartman */ 1481ab4382d2SGreg Kroah-Hartman static int 1482ab4382d2SGreg Kroah-Hartman imx_verify_port(struct uart_port *port, struct serial_struct *ser) 1483ab4382d2SGreg Kroah-Hartman { 1484ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1485ab4382d2SGreg Kroah-Hartman int ret = 0; 1486ab4382d2SGreg Kroah-Hartman 1487ab4382d2SGreg Kroah-Hartman if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX) 1488ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1489ab4382d2SGreg Kroah-Hartman if (sport->port.irq != ser->irq) 1490ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1491ab4382d2SGreg Kroah-Hartman if (ser->io_type != UPIO_MEM) 1492ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1493ab4382d2SGreg Kroah-Hartman if (sport->port.uartclk / 16 != ser->baud_base) 1494ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1495a50c44ceSOlof Johansson if (sport->port.mapbase != (unsigned long)ser->iomem_base) 1496ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1497ab4382d2SGreg Kroah-Hartman if (sport->port.iobase != ser->port) 1498ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1499ab4382d2SGreg Kroah-Hartman if (ser->hub6 != 0) 1500ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 1501ab4382d2SGreg Kroah-Hartman return ret; 1502ab4382d2SGreg Kroah-Hartman } 1503ab4382d2SGreg Kroah-Hartman 150401f56abdSSaleem Abdulrasool #if defined(CONFIG_CONSOLE_POLL) 15056b8bdad9SDaniel Thompson 15066b8bdad9SDaniel Thompson static int imx_poll_init(struct uart_port *port) 15076b8bdad9SDaniel Thompson { 15086b8bdad9SDaniel Thompson struct imx_port *sport = (struct imx_port *)port; 15096b8bdad9SDaniel Thompson unsigned long flags; 15106b8bdad9SDaniel Thompson unsigned long temp; 15116b8bdad9SDaniel Thompson int retval; 15126b8bdad9SDaniel Thompson 15136b8bdad9SDaniel Thompson retval = clk_prepare_enable(sport->clk_ipg); 15146b8bdad9SDaniel Thompson if (retval) 15156b8bdad9SDaniel Thompson return retval; 15166b8bdad9SDaniel Thompson retval = clk_prepare_enable(sport->clk_per); 15176b8bdad9SDaniel Thompson if (retval) 15186b8bdad9SDaniel Thompson clk_disable_unprepare(sport->clk_ipg); 15196b8bdad9SDaniel Thompson 1520cc32382dSLucas Stach imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); 15216b8bdad9SDaniel Thompson 15226b8bdad9SDaniel Thompson spin_lock_irqsave(&sport->port.lock, flags); 15236b8bdad9SDaniel Thompson 15246b8bdad9SDaniel Thompson temp = readl(sport->port.membase + UCR1); 15256b8bdad9SDaniel Thompson if (is_imx1_uart(sport)) 15266b8bdad9SDaniel Thompson temp |= IMX1_UCR1_UARTCLKEN; 15276b8bdad9SDaniel Thompson temp |= UCR1_UARTEN | UCR1_RRDYEN; 15286b8bdad9SDaniel Thompson temp &= ~(UCR1_TXMPTYEN | UCR1_RTSDEN); 15296b8bdad9SDaniel Thompson writel(temp, sport->port.membase + UCR1); 15306b8bdad9SDaniel Thompson 15316b8bdad9SDaniel Thompson temp = readl(sport->port.membase + UCR2); 15326b8bdad9SDaniel Thompson temp |= UCR2_RXEN; 15336b8bdad9SDaniel Thompson writel(temp, sport->port.membase + UCR2); 15346b8bdad9SDaniel Thompson 15356b8bdad9SDaniel Thompson spin_unlock_irqrestore(&sport->port.lock, flags); 15366b8bdad9SDaniel Thompson 15376b8bdad9SDaniel Thompson return 0; 15386b8bdad9SDaniel Thompson } 15396b8bdad9SDaniel Thompson 154001f56abdSSaleem Abdulrasool static int imx_poll_get_char(struct uart_port *port) 154101f56abdSSaleem Abdulrasool { 1542f968ef34SDaniel Thompson if (!(readl_relaxed(port->membase + USR2) & USR2_RDR)) 154326c47412SDirk Behme return NO_POLL_CHAR; 154401f56abdSSaleem Abdulrasool 1545f968ef34SDaniel Thompson return readl_relaxed(port->membase + URXD0) & URXD_RX_DATA; 154601f56abdSSaleem Abdulrasool } 154701f56abdSSaleem Abdulrasool 154801f56abdSSaleem Abdulrasool static void imx_poll_put_char(struct uart_port *port, unsigned char c) 154901f56abdSSaleem Abdulrasool { 155001f56abdSSaleem Abdulrasool unsigned int status; 155101f56abdSSaleem Abdulrasool 155201f56abdSSaleem Abdulrasool /* drain */ 155301f56abdSSaleem Abdulrasool do { 1554f968ef34SDaniel Thompson status = readl_relaxed(port->membase + USR1); 155501f56abdSSaleem Abdulrasool } while (~status & USR1_TRDY); 155601f56abdSSaleem Abdulrasool 155701f56abdSSaleem Abdulrasool /* write */ 1558f968ef34SDaniel Thompson writel_relaxed(c, port->membase + URTX0); 155901f56abdSSaleem Abdulrasool 156001f56abdSSaleem Abdulrasool /* flush */ 156101f56abdSSaleem Abdulrasool do { 1562f968ef34SDaniel Thompson status = readl_relaxed(port->membase + USR2); 156301f56abdSSaleem Abdulrasool } while (~status & USR2_TXDC); 156401f56abdSSaleem Abdulrasool } 156501f56abdSSaleem Abdulrasool #endif 156601f56abdSSaleem Abdulrasool 156717b8f2a3SUwe Kleine-König static int imx_rs485_config(struct uart_port *port, 156817b8f2a3SUwe Kleine-König struct serial_rs485 *rs485conf) 156917b8f2a3SUwe Kleine-König { 157017b8f2a3SUwe Kleine-König struct imx_port *sport = (struct imx_port *)port; 157117b8f2a3SUwe Kleine-König 157217b8f2a3SUwe Kleine-König /* unimplemented */ 157317b8f2a3SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 157417b8f2a3SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 157517b8f2a3SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 157617b8f2a3SUwe Kleine-König 157717b8f2a3SUwe Kleine-König /* RTS is required to control the transmitter */ 157817b8f2a3SUwe Kleine-König if (!sport->have_rtscts) 157917b8f2a3SUwe Kleine-König rs485conf->flags &= ~SER_RS485_ENABLED; 158017b8f2a3SUwe Kleine-König 158117b8f2a3SUwe Kleine-König if (rs485conf->flags & SER_RS485_ENABLED) { 158217b8f2a3SUwe Kleine-König unsigned long temp; 158317b8f2a3SUwe Kleine-König 158417b8f2a3SUwe Kleine-König /* disable transmitter */ 158517b8f2a3SUwe Kleine-König temp = readl(sport->port.membase + UCR2); 158617b8f2a3SUwe Kleine-König temp &= ~UCR2_CTSC; 158717b8f2a3SUwe Kleine-König if (rs485conf->flags & SER_RS485_RTS_AFTER_SEND) 158817b8f2a3SUwe Kleine-König temp &= ~UCR2_CTS; 158917b8f2a3SUwe Kleine-König else 159017b8f2a3SUwe Kleine-König temp |= UCR2_CTS; 159117b8f2a3SUwe Kleine-König writel(temp, sport->port.membase + UCR2); 159217b8f2a3SUwe Kleine-König } 159317b8f2a3SUwe Kleine-König 159417b8f2a3SUwe Kleine-König port->rs485 = *rs485conf; 159517b8f2a3SUwe Kleine-König 159617b8f2a3SUwe Kleine-König return 0; 159717b8f2a3SUwe Kleine-König } 159817b8f2a3SUwe Kleine-König 1599ab4382d2SGreg Kroah-Hartman static struct uart_ops imx_pops = { 1600ab4382d2SGreg Kroah-Hartman .tx_empty = imx_tx_empty, 1601ab4382d2SGreg Kroah-Hartman .set_mctrl = imx_set_mctrl, 1602ab4382d2SGreg Kroah-Hartman .get_mctrl = imx_get_mctrl, 1603ab4382d2SGreg Kroah-Hartman .stop_tx = imx_stop_tx, 1604ab4382d2SGreg Kroah-Hartman .start_tx = imx_start_tx, 1605ab4382d2SGreg Kroah-Hartman .stop_rx = imx_stop_rx, 1606ab4382d2SGreg Kroah-Hartman .enable_ms = imx_enable_ms, 1607ab4382d2SGreg Kroah-Hartman .break_ctl = imx_break_ctl, 1608ab4382d2SGreg Kroah-Hartman .startup = imx_startup, 1609ab4382d2SGreg Kroah-Hartman .shutdown = imx_shutdown, 1610eb56b7edSHuang Shijie .flush_buffer = imx_flush_buffer, 1611ab4382d2SGreg Kroah-Hartman .set_termios = imx_set_termios, 1612ab4382d2SGreg Kroah-Hartman .type = imx_type, 1613ab4382d2SGreg Kroah-Hartman .config_port = imx_config_port, 1614ab4382d2SGreg Kroah-Hartman .verify_port = imx_verify_port, 161501f56abdSSaleem Abdulrasool #if defined(CONFIG_CONSOLE_POLL) 16166b8bdad9SDaniel Thompson .poll_init = imx_poll_init, 161701f56abdSSaleem Abdulrasool .poll_get_char = imx_poll_get_char, 161801f56abdSSaleem Abdulrasool .poll_put_char = imx_poll_put_char, 161901f56abdSSaleem Abdulrasool #endif 1620ab4382d2SGreg Kroah-Hartman }; 1621ab4382d2SGreg Kroah-Hartman 1622ab4382d2SGreg Kroah-Hartman static struct imx_port *imx_ports[UART_NR]; 1623ab4382d2SGreg Kroah-Hartman 1624ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_IMX_CONSOLE 1625ab4382d2SGreg Kroah-Hartman static void imx_console_putchar(struct uart_port *port, int ch) 1626ab4382d2SGreg Kroah-Hartman { 1627ab4382d2SGreg Kroah-Hartman struct imx_port *sport = (struct imx_port *)port; 1628ab4382d2SGreg Kroah-Hartman 1629fe6b540aSShawn Guo while (readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL) 1630ab4382d2SGreg Kroah-Hartman barrier(); 1631ab4382d2SGreg Kroah-Hartman 1632ab4382d2SGreg Kroah-Hartman writel(ch, sport->port.membase + URTX0); 1633ab4382d2SGreg Kroah-Hartman } 1634ab4382d2SGreg Kroah-Hartman 1635ab4382d2SGreg Kroah-Hartman /* 1636ab4382d2SGreg Kroah-Hartman * Interrupts are disabled on entering 1637ab4382d2SGreg Kroah-Hartman */ 1638ab4382d2SGreg Kroah-Hartman static void 1639ab4382d2SGreg Kroah-Hartman imx_console_write(struct console *co, const char *s, unsigned int count) 1640ab4382d2SGreg Kroah-Hartman { 1641ab4382d2SGreg Kroah-Hartman struct imx_port *sport = imx_ports[co->index]; 16420ad5a814SDirk Behme struct imx_port_ucrs old_ucr; 16430ad5a814SDirk Behme unsigned int ucr1; 1644f30e8260SShawn Guo unsigned long flags = 0; 1645677fe555SThomas Gleixner int locked = 1; 16461cf93e0dSHuang Shijie int retval; 16471cf93e0dSHuang Shijie 16489e7b399dSEduardo Valentin retval = clk_prepare_enable(sport->clk_per); 16491cf93e0dSHuang Shijie if (retval) 16501cf93e0dSHuang Shijie return; 16519e7b399dSEduardo Valentin retval = clk_prepare_enable(sport->clk_ipg); 16521cf93e0dSHuang Shijie if (retval) { 16539e7b399dSEduardo Valentin clk_disable_unprepare(sport->clk_per); 16541cf93e0dSHuang Shijie return; 16551cf93e0dSHuang Shijie } 16569ec1882dSXinyu Chen 1657677fe555SThomas Gleixner if (sport->port.sysrq) 1658677fe555SThomas Gleixner locked = 0; 1659677fe555SThomas Gleixner else if (oops_in_progress) 1660677fe555SThomas Gleixner locked = spin_trylock_irqsave(&sport->port.lock, flags); 1661677fe555SThomas Gleixner else 16629ec1882dSXinyu Chen spin_lock_irqsave(&sport->port.lock, flags); 1663ab4382d2SGreg Kroah-Hartman 1664ab4382d2SGreg Kroah-Hartman /* 16650ad5a814SDirk Behme * First, save UCR1/2/3 and then disable interrupts 1666ab4382d2SGreg Kroah-Hartman */ 16670ad5a814SDirk Behme imx_port_ucrs_save(&sport->port, &old_ucr); 16680ad5a814SDirk Behme ucr1 = old_ucr.ucr1; 1669ab4382d2SGreg Kroah-Hartman 1670fe6b540aSShawn Guo if (is_imx1_uart(sport)) 1671fe6b540aSShawn Guo ucr1 |= IMX1_UCR1_UARTCLKEN; 1672ab4382d2SGreg Kroah-Hartman ucr1 |= UCR1_UARTEN; 1673ab4382d2SGreg Kroah-Hartman ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN); 1674ab4382d2SGreg Kroah-Hartman 1675ab4382d2SGreg Kroah-Hartman writel(ucr1, sport->port.membase + UCR1); 1676ab4382d2SGreg Kroah-Hartman 16770ad5a814SDirk Behme writel(old_ucr.ucr2 | UCR2_TXEN, sport->port.membase + UCR2); 1678ab4382d2SGreg Kroah-Hartman 1679ab4382d2SGreg Kroah-Hartman uart_console_write(&sport->port, s, count, imx_console_putchar); 1680ab4382d2SGreg Kroah-Hartman 1681ab4382d2SGreg Kroah-Hartman /* 1682ab4382d2SGreg Kroah-Hartman * Finally, wait for transmitter to become empty 16830ad5a814SDirk Behme * and restore UCR1/2/3 1684ab4382d2SGreg Kroah-Hartman */ 1685ab4382d2SGreg Kroah-Hartman while (!(readl(sport->port.membase + USR2) & USR2_TXDC)); 1686ab4382d2SGreg Kroah-Hartman 16870ad5a814SDirk Behme imx_port_ucrs_restore(&sport->port, &old_ucr); 16889ec1882dSXinyu Chen 1689677fe555SThomas Gleixner if (locked) 16909ec1882dSXinyu Chen spin_unlock_irqrestore(&sport->port.lock, flags); 16911cf93e0dSHuang Shijie 16929e7b399dSEduardo Valentin clk_disable_unprepare(sport->clk_ipg); 16939e7b399dSEduardo Valentin clk_disable_unprepare(sport->clk_per); 1694ab4382d2SGreg Kroah-Hartman } 1695ab4382d2SGreg Kroah-Hartman 1696ab4382d2SGreg Kroah-Hartman /* 1697ab4382d2SGreg Kroah-Hartman * If the port was already initialised (eg, by a boot loader), 1698ab4382d2SGreg Kroah-Hartman * try to determine the current setup. 1699ab4382d2SGreg Kroah-Hartman */ 1700ab4382d2SGreg Kroah-Hartman static void __init 1701ab4382d2SGreg Kroah-Hartman imx_console_get_options(struct imx_port *sport, int *baud, 1702ab4382d2SGreg Kroah-Hartman int *parity, int *bits) 1703ab4382d2SGreg Kroah-Hartman { 1704ab4382d2SGreg Kroah-Hartman 1705ab4382d2SGreg Kroah-Hartman if (readl(sport->port.membase + UCR1) & UCR1_UARTEN) { 1706ab4382d2SGreg Kroah-Hartman /* ok, the port was enabled */ 1707ab4382d2SGreg Kroah-Hartman unsigned int ucr2, ubir, ubmr, uartclk; 1708ab4382d2SGreg Kroah-Hartman unsigned int baud_raw; 1709ab4382d2SGreg Kroah-Hartman unsigned int ucfr_rfdiv; 1710ab4382d2SGreg Kroah-Hartman 1711ab4382d2SGreg Kroah-Hartman ucr2 = readl(sport->port.membase + UCR2); 1712ab4382d2SGreg Kroah-Hartman 1713ab4382d2SGreg Kroah-Hartman *parity = 'n'; 1714ab4382d2SGreg Kroah-Hartman if (ucr2 & UCR2_PREN) { 1715ab4382d2SGreg Kroah-Hartman if (ucr2 & UCR2_PROE) 1716ab4382d2SGreg Kroah-Hartman *parity = 'o'; 1717ab4382d2SGreg Kroah-Hartman else 1718ab4382d2SGreg Kroah-Hartman *parity = 'e'; 1719ab4382d2SGreg Kroah-Hartman } 1720ab4382d2SGreg Kroah-Hartman 1721ab4382d2SGreg Kroah-Hartman if (ucr2 & UCR2_WS) 1722ab4382d2SGreg Kroah-Hartman *bits = 8; 1723ab4382d2SGreg Kroah-Hartman else 1724ab4382d2SGreg Kroah-Hartman *bits = 7; 1725ab4382d2SGreg Kroah-Hartman 1726ab4382d2SGreg Kroah-Hartman ubir = readl(sport->port.membase + UBIR) & 0xffff; 1727ab4382d2SGreg Kroah-Hartman ubmr = readl(sport->port.membase + UBMR) & 0xffff; 1728ab4382d2SGreg Kroah-Hartman 1729ab4382d2SGreg Kroah-Hartman ucfr_rfdiv = (readl(sport->port.membase + UFCR) & UFCR_RFDIV) >> 7; 1730ab4382d2SGreg Kroah-Hartman if (ucfr_rfdiv == 6) 1731ab4382d2SGreg Kroah-Hartman ucfr_rfdiv = 7; 1732ab4382d2SGreg Kroah-Hartman else 1733ab4382d2SGreg Kroah-Hartman ucfr_rfdiv = 6 - ucfr_rfdiv; 1734ab4382d2SGreg Kroah-Hartman 17353a9465faSSascha Hauer uartclk = clk_get_rate(sport->clk_per); 1736ab4382d2SGreg Kroah-Hartman uartclk /= ucfr_rfdiv; 1737ab4382d2SGreg Kroah-Hartman 1738ab4382d2SGreg Kroah-Hartman { /* 1739ab4382d2SGreg Kroah-Hartman * The next code provides exact computation of 1740ab4382d2SGreg Kroah-Hartman * baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1)) 1741ab4382d2SGreg Kroah-Hartman * without need of float support or long long division, 1742ab4382d2SGreg Kroah-Hartman * which would be required to prevent 32bit arithmetic overflow 1743ab4382d2SGreg Kroah-Hartman */ 1744ab4382d2SGreg Kroah-Hartman unsigned int mul = ubir + 1; 1745ab4382d2SGreg Kroah-Hartman unsigned int div = 16 * (ubmr + 1); 1746ab4382d2SGreg Kroah-Hartman unsigned int rem = uartclk % div; 1747ab4382d2SGreg Kroah-Hartman 1748ab4382d2SGreg Kroah-Hartman baud_raw = (uartclk / div) * mul; 1749ab4382d2SGreg Kroah-Hartman baud_raw += (rem * mul + div / 2) / div; 1750ab4382d2SGreg Kroah-Hartman *baud = (baud_raw + 50) / 100 * 100; 1751ab4382d2SGreg Kroah-Hartman } 1752ab4382d2SGreg Kroah-Hartman 1753ab4382d2SGreg Kroah-Hartman if (*baud != baud_raw) 175450bbdba3SSachin Kamat pr_info("Console IMX rounded baud rate from %d to %d\n", 1755ab4382d2SGreg Kroah-Hartman baud_raw, *baud); 1756ab4382d2SGreg Kroah-Hartman } 1757ab4382d2SGreg Kroah-Hartman } 1758ab4382d2SGreg Kroah-Hartman 1759ab4382d2SGreg Kroah-Hartman static int __init 1760ab4382d2SGreg Kroah-Hartman imx_console_setup(struct console *co, char *options) 1761ab4382d2SGreg Kroah-Hartman { 1762ab4382d2SGreg Kroah-Hartman struct imx_port *sport; 1763ab4382d2SGreg Kroah-Hartman int baud = 9600; 1764ab4382d2SGreg Kroah-Hartman int bits = 8; 1765ab4382d2SGreg Kroah-Hartman int parity = 'n'; 1766ab4382d2SGreg Kroah-Hartman int flow = 'n'; 17671cf93e0dSHuang Shijie int retval; 1768ab4382d2SGreg Kroah-Hartman 1769ab4382d2SGreg Kroah-Hartman /* 1770ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1771ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1772ab4382d2SGreg Kroah-Hartman * console support. 1773ab4382d2SGreg Kroah-Hartman */ 1774ab4382d2SGreg Kroah-Hartman if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports)) 1775ab4382d2SGreg Kroah-Hartman co->index = 0; 1776ab4382d2SGreg Kroah-Hartman sport = imx_ports[co->index]; 1777ab4382d2SGreg Kroah-Hartman if (sport == NULL) 1778ab4382d2SGreg Kroah-Hartman return -ENODEV; 1779ab4382d2SGreg Kroah-Hartman 17801cf93e0dSHuang Shijie /* For setting the registers, we only need to enable the ipg clock. */ 17811cf93e0dSHuang Shijie retval = clk_prepare_enable(sport->clk_ipg); 17821cf93e0dSHuang Shijie if (retval) 17831cf93e0dSHuang Shijie goto error_console; 17841cf93e0dSHuang Shijie 1785ab4382d2SGreg Kroah-Hartman if (options) 1786ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 1787ab4382d2SGreg Kroah-Hartman else 1788ab4382d2SGreg Kroah-Hartman imx_console_get_options(sport, &baud, &parity, &bits); 1789ab4382d2SGreg Kroah-Hartman 1790cc32382dSLucas Stach imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); 1791ab4382d2SGreg Kroah-Hartman 17921cf93e0dSHuang Shijie retval = uart_set_options(&sport->port, co, baud, parity, bits, flow); 17931cf93e0dSHuang Shijie 17941cf93e0dSHuang Shijie clk_disable_unprepare(sport->clk_ipg); 17951cf93e0dSHuang Shijie 17961cf93e0dSHuang Shijie error_console: 17971cf93e0dSHuang Shijie return retval; 1798ab4382d2SGreg Kroah-Hartman } 1799ab4382d2SGreg Kroah-Hartman 1800ab4382d2SGreg Kroah-Hartman static struct uart_driver imx_reg; 1801ab4382d2SGreg Kroah-Hartman static struct console imx_console = { 1802ab4382d2SGreg Kroah-Hartman .name = DEV_NAME, 1803ab4382d2SGreg Kroah-Hartman .write = imx_console_write, 1804ab4382d2SGreg Kroah-Hartman .device = uart_console_device, 1805ab4382d2SGreg Kroah-Hartman .setup = imx_console_setup, 1806ab4382d2SGreg Kroah-Hartman .flags = CON_PRINTBUFFER, 1807ab4382d2SGreg Kroah-Hartman .index = -1, 1808ab4382d2SGreg Kroah-Hartman .data = &imx_reg, 1809ab4382d2SGreg Kroah-Hartman }; 1810ab4382d2SGreg Kroah-Hartman 1811ab4382d2SGreg Kroah-Hartman #define IMX_CONSOLE &imx_console 1812913c6c0eSLucas Stach 1813913c6c0eSLucas Stach #ifdef CONFIG_OF 1814913c6c0eSLucas Stach static void imx_console_early_putchar(struct uart_port *port, int ch) 1815913c6c0eSLucas Stach { 1816913c6c0eSLucas Stach while (readl_relaxed(port->membase + IMX21_UTS) & UTS_TXFULL) 1817913c6c0eSLucas Stach cpu_relax(); 1818913c6c0eSLucas Stach 1819913c6c0eSLucas Stach writel_relaxed(ch, port->membase + URTX0); 1820913c6c0eSLucas Stach } 1821913c6c0eSLucas Stach 1822913c6c0eSLucas Stach static void imx_console_early_write(struct console *con, const char *s, 1823913c6c0eSLucas Stach unsigned count) 1824913c6c0eSLucas Stach { 1825913c6c0eSLucas Stach struct earlycon_device *dev = con->data; 1826913c6c0eSLucas Stach 1827913c6c0eSLucas Stach uart_console_write(&dev->port, s, count, imx_console_early_putchar); 1828913c6c0eSLucas Stach } 1829913c6c0eSLucas Stach 1830913c6c0eSLucas Stach static int __init 1831913c6c0eSLucas Stach imx_console_early_setup(struct earlycon_device *dev, const char *opt) 1832913c6c0eSLucas Stach { 1833913c6c0eSLucas Stach if (!dev->port.membase) 1834913c6c0eSLucas Stach return -ENODEV; 1835913c6c0eSLucas Stach 1836913c6c0eSLucas Stach dev->con->write = imx_console_early_write; 1837913c6c0eSLucas Stach 1838913c6c0eSLucas Stach return 0; 1839913c6c0eSLucas Stach } 1840913c6c0eSLucas Stach OF_EARLYCON_DECLARE(ec_imx6q, "fsl,imx6q-uart", imx_console_early_setup); 1841913c6c0eSLucas Stach OF_EARLYCON_DECLARE(ec_imx21, "fsl,imx21-uart", imx_console_early_setup); 1842913c6c0eSLucas Stach #endif 1843913c6c0eSLucas Stach 1844ab4382d2SGreg Kroah-Hartman #else 1845ab4382d2SGreg Kroah-Hartman #define IMX_CONSOLE NULL 1846ab4382d2SGreg Kroah-Hartman #endif 1847ab4382d2SGreg Kroah-Hartman 1848ab4382d2SGreg Kroah-Hartman static struct uart_driver imx_reg = { 1849ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1850ab4382d2SGreg Kroah-Hartman .driver_name = DRIVER_NAME, 1851ab4382d2SGreg Kroah-Hartman .dev_name = DEV_NAME, 1852ab4382d2SGreg Kroah-Hartman .major = SERIAL_IMX_MAJOR, 1853ab4382d2SGreg Kroah-Hartman .minor = MINOR_START, 1854ab4382d2SGreg Kroah-Hartman .nr = ARRAY_SIZE(imx_ports), 1855ab4382d2SGreg Kroah-Hartman .cons = IMX_CONSOLE, 1856ab4382d2SGreg Kroah-Hartman }; 1857ab4382d2SGreg Kroah-Hartman 185822698aa2SShawn Guo #ifdef CONFIG_OF 185920bb8095SUwe Kleine-König /* 186020bb8095SUwe Kleine-König * This function returns 1 iff pdev isn't a device instatiated by dt, 0 iff it 186120bb8095SUwe Kleine-König * could successfully get all information from dt or a negative errno. 186220bb8095SUwe Kleine-König */ 186322698aa2SShawn Guo static int serial_imx_probe_dt(struct imx_port *sport, 186422698aa2SShawn Guo struct platform_device *pdev) 186522698aa2SShawn Guo { 186622698aa2SShawn Guo struct device_node *np = pdev->dev.of_node; 186722698aa2SShawn Guo const struct of_device_id *of_id = 186822698aa2SShawn Guo of_match_device(imx_uart_dt_ids, &pdev->dev); 1869ff05967aSShawn Guo int ret; 187022698aa2SShawn Guo 187122698aa2SShawn Guo if (!np) 187220bb8095SUwe Kleine-König /* no device tree device */ 187320bb8095SUwe Kleine-König return 1; 187422698aa2SShawn Guo 1875ff05967aSShawn Guo ret = of_alias_get_id(np, "serial"); 1876ff05967aSShawn Guo if (ret < 0) { 1877ff05967aSShawn Guo dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret); 1878a197a191SUwe Kleine-König return ret; 1879ff05967aSShawn Guo } 1880ff05967aSShawn Guo sport->port.line = ret; 188122698aa2SShawn Guo 188222698aa2SShawn Guo if (of_get_property(np, "fsl,uart-has-rtscts", NULL)) 188322698aa2SShawn Guo sport->have_rtscts = 1; 188422698aa2SShawn Guo 188520ff2fe6SHuang Shijie if (of_get_property(np, "fsl,dte-mode", NULL)) 188620ff2fe6SHuang Shijie sport->dte_mode = 1; 188720ff2fe6SHuang Shijie 188822698aa2SShawn Guo sport->devdata = of_id->data; 188922698aa2SShawn Guo 189022698aa2SShawn Guo return 0; 189122698aa2SShawn Guo } 189222698aa2SShawn Guo #else 189322698aa2SShawn Guo static inline int serial_imx_probe_dt(struct imx_port *sport, 189422698aa2SShawn Guo struct platform_device *pdev) 189522698aa2SShawn Guo { 189620bb8095SUwe Kleine-König return 1; 189722698aa2SShawn Guo } 189822698aa2SShawn Guo #endif 189922698aa2SShawn Guo 190022698aa2SShawn Guo static void serial_imx_probe_pdata(struct imx_port *sport, 190122698aa2SShawn Guo struct platform_device *pdev) 190222698aa2SShawn Guo { 1903574de559SJingoo Han struct imxuart_platform_data *pdata = dev_get_platdata(&pdev->dev); 190422698aa2SShawn Guo 190522698aa2SShawn Guo sport->port.line = pdev->id; 190622698aa2SShawn Guo sport->devdata = (struct imx_uart_data *) pdev->id_entry->driver_data; 190722698aa2SShawn Guo 190822698aa2SShawn Guo if (!pdata) 190922698aa2SShawn Guo return; 191022698aa2SShawn Guo 191122698aa2SShawn Guo if (pdata->flags & IMXUART_HAVE_RTSCTS) 191222698aa2SShawn Guo sport->have_rtscts = 1; 191322698aa2SShawn Guo } 191422698aa2SShawn Guo 1915ab4382d2SGreg Kroah-Hartman static int serial_imx_probe(struct platform_device *pdev) 1916ab4382d2SGreg Kroah-Hartman { 1917ab4382d2SGreg Kroah-Hartman struct imx_port *sport; 1918ab4382d2SGreg Kroah-Hartman void __iomem *base; 19198a61f0c7SFabio Estevam int ret = 0, reg; 1920ab4382d2SGreg Kroah-Hartman struct resource *res; 1921842633bdSUwe Kleine-König int txirq, rxirq, rtsirq; 1922ab4382d2SGreg Kroah-Hartman 192342d34191SSachin Kamat sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL); 1924ab4382d2SGreg Kroah-Hartman if (!sport) 1925ab4382d2SGreg Kroah-Hartman return -ENOMEM; 1926ab4382d2SGreg Kroah-Hartman 192722698aa2SShawn Guo ret = serial_imx_probe_dt(sport, pdev); 192820bb8095SUwe Kleine-König if (ret > 0) 192922698aa2SShawn Guo serial_imx_probe_pdata(sport, pdev); 193020bb8095SUwe Kleine-König else if (ret < 0) 193142d34191SSachin Kamat return ret; 193222698aa2SShawn Guo 1933ab4382d2SGreg Kroah-Hartman res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1934da82f997SAlexander Shiyan base = devm_ioremap_resource(&pdev->dev, res); 1935da82f997SAlexander Shiyan if (IS_ERR(base)) 1936da82f997SAlexander Shiyan return PTR_ERR(base); 1937ab4382d2SGreg Kroah-Hartman 1938842633bdSUwe Kleine-König rxirq = platform_get_irq(pdev, 0); 1939842633bdSUwe Kleine-König txirq = platform_get_irq(pdev, 1); 1940842633bdSUwe Kleine-König rtsirq = platform_get_irq(pdev, 2); 1941842633bdSUwe Kleine-König 1942ab4382d2SGreg Kroah-Hartman sport->port.dev = &pdev->dev; 1943ab4382d2SGreg Kroah-Hartman sport->port.mapbase = res->start; 1944ab4382d2SGreg Kroah-Hartman sport->port.membase = base; 1945ab4382d2SGreg Kroah-Hartman sport->port.type = PORT_IMX, 1946ab4382d2SGreg Kroah-Hartman sport->port.iotype = UPIO_MEM; 1947842633bdSUwe Kleine-König sport->port.irq = rxirq; 1948ab4382d2SGreg Kroah-Hartman sport->port.fifosize = 32; 1949ab4382d2SGreg Kroah-Hartman sport->port.ops = &imx_pops; 195017b8f2a3SUwe Kleine-König sport->port.rs485_config = imx_rs485_config; 195117b8f2a3SUwe Kleine-König sport->port.rs485.flags = 195217b8f2a3SUwe Kleine-König SER_RS485_RTS_ON_SEND | SER_RS485_RX_DURING_TX; 1953ab4382d2SGreg Kroah-Hartman sport->port.flags = UPF_BOOT_AUTOCONF; 1954ab4382d2SGreg Kroah-Hartman init_timer(&sport->timer); 1955ab4382d2SGreg Kroah-Hartman sport->timer.function = imx_timeout; 1956ab4382d2SGreg Kroah-Hartman sport->timer.data = (unsigned long)sport; 1957ab4382d2SGreg Kroah-Hartman 19583a9465faSSascha Hauer sport->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 19593a9465faSSascha Hauer if (IS_ERR(sport->clk_ipg)) { 19603a9465faSSascha Hauer ret = PTR_ERR(sport->clk_ipg); 1961833462e9SUwe Kleine-König dev_err(&pdev->dev, "failed to get ipg clk: %d\n", ret); 196242d34191SSachin Kamat return ret; 1963ab4382d2SGreg Kroah-Hartman } 1964ab4382d2SGreg Kroah-Hartman 19653a9465faSSascha Hauer sport->clk_per = devm_clk_get(&pdev->dev, "per"); 19663a9465faSSascha Hauer if (IS_ERR(sport->clk_per)) { 19673a9465faSSascha Hauer ret = PTR_ERR(sport->clk_per); 1968833462e9SUwe Kleine-König dev_err(&pdev->dev, "failed to get per clk: %d\n", ret); 196942d34191SSachin Kamat return ret; 19703a9465faSSascha Hauer } 19713a9465faSSascha Hauer 19723a9465faSSascha Hauer sport->port.uartclk = clk_get_rate(sport->clk_per); 1973ab4382d2SGreg Kroah-Hartman 19748a61f0c7SFabio Estevam /* For register access, we only need to enable the ipg clock. */ 19758a61f0c7SFabio Estevam ret = clk_prepare_enable(sport->clk_ipg); 19768a61f0c7SFabio Estevam if (ret) 19778a61f0c7SFabio Estevam return ret; 19788a61f0c7SFabio Estevam 19798a61f0c7SFabio Estevam /* Disable interrupts before requesting them */ 19808a61f0c7SFabio Estevam reg = readl_relaxed(sport->port.membase + UCR1); 19818a61f0c7SFabio Estevam reg &= ~(UCR1_ADEN | UCR1_TRDYEN | UCR1_IDEN | UCR1_RRDYEN | 19828a61f0c7SFabio Estevam UCR1_TXMPTYEN | UCR1_RTSDEN); 19838a61f0c7SFabio Estevam writel_relaxed(reg, sport->port.membase + UCR1); 19848a61f0c7SFabio Estevam 19858a61f0c7SFabio Estevam clk_disable_unprepare(sport->clk_ipg); 19868a61f0c7SFabio Estevam 1987c0d1c6b0SFabio Estevam /* 1988c0d1c6b0SFabio Estevam * Allocate the IRQ(s) i.MX1 has three interrupts whereas later 1989c0d1c6b0SFabio Estevam * chips only have one interrupt. 1990c0d1c6b0SFabio Estevam */ 1991842633bdSUwe Kleine-König if (txirq > 0) { 1992842633bdSUwe Kleine-König ret = devm_request_irq(&pdev->dev, rxirq, imx_rxint, 0, 1993c0d1c6b0SFabio Estevam dev_name(&pdev->dev), sport); 1994c0d1c6b0SFabio Estevam if (ret) 1995c0d1c6b0SFabio Estevam return ret; 1996c0d1c6b0SFabio Estevam 1997842633bdSUwe Kleine-König ret = devm_request_irq(&pdev->dev, txirq, imx_txint, 0, 1998c0d1c6b0SFabio Estevam dev_name(&pdev->dev), sport); 1999c0d1c6b0SFabio Estevam if (ret) 2000c0d1c6b0SFabio Estevam return ret; 2001c0d1c6b0SFabio Estevam } else { 2002842633bdSUwe Kleine-König ret = devm_request_irq(&pdev->dev, rxirq, imx_int, 0, 2003c0d1c6b0SFabio Estevam dev_name(&pdev->dev), sport); 2004c0d1c6b0SFabio Estevam if (ret) 2005c0d1c6b0SFabio Estevam return ret; 2006c0d1c6b0SFabio Estevam } 2007c0d1c6b0SFabio Estevam 200822698aa2SShawn Guo imx_ports[sport->port.line] = sport; 2009ab4382d2SGreg Kroah-Hartman 20100a86a86bSRichard Zhao platform_set_drvdata(pdev, sport); 2011ab4382d2SGreg Kroah-Hartman 201245af780aSAlexander Shiyan return uart_add_one_port(&imx_reg, &sport->port); 2013ab4382d2SGreg Kroah-Hartman } 2014ab4382d2SGreg Kroah-Hartman 2015ab4382d2SGreg Kroah-Hartman static int serial_imx_remove(struct platform_device *pdev) 2016ab4382d2SGreg Kroah-Hartman { 2017ab4382d2SGreg Kroah-Hartman struct imx_port *sport = platform_get_drvdata(pdev); 2018ab4382d2SGreg Kroah-Hartman 201945af780aSAlexander Shiyan return uart_remove_one_port(&imx_reg, &sport->port); 2020ab4382d2SGreg Kroah-Hartman } 2021ab4382d2SGreg Kroah-Hartman 2022c868cbb7SEduardo Valentin static void serial_imx_restore_context(struct imx_port *sport) 2023c868cbb7SEduardo Valentin { 2024c868cbb7SEduardo Valentin if (!sport->context_saved) 2025c868cbb7SEduardo Valentin return; 2026c868cbb7SEduardo Valentin 2027c868cbb7SEduardo Valentin writel(sport->saved_reg[4], sport->port.membase + UFCR); 2028c868cbb7SEduardo Valentin writel(sport->saved_reg[5], sport->port.membase + UESC); 2029c868cbb7SEduardo Valentin writel(sport->saved_reg[6], sport->port.membase + UTIM); 2030c868cbb7SEduardo Valentin writel(sport->saved_reg[7], sport->port.membase + UBIR); 2031c868cbb7SEduardo Valentin writel(sport->saved_reg[8], sport->port.membase + UBMR); 2032c868cbb7SEduardo Valentin writel(sport->saved_reg[9], sport->port.membase + IMX21_UTS); 2033c868cbb7SEduardo Valentin writel(sport->saved_reg[0], sport->port.membase + UCR1); 2034c868cbb7SEduardo Valentin writel(sport->saved_reg[1] | UCR2_SRST, sport->port.membase + UCR2); 2035c868cbb7SEduardo Valentin writel(sport->saved_reg[2], sport->port.membase + UCR3); 2036c868cbb7SEduardo Valentin writel(sport->saved_reg[3], sport->port.membase + UCR4); 2037c868cbb7SEduardo Valentin sport->context_saved = false; 2038c868cbb7SEduardo Valentin } 2039c868cbb7SEduardo Valentin 2040c868cbb7SEduardo Valentin static void serial_imx_save_context(struct imx_port *sport) 2041c868cbb7SEduardo Valentin { 2042c868cbb7SEduardo Valentin /* Save necessary regs */ 2043c868cbb7SEduardo Valentin sport->saved_reg[0] = readl(sport->port.membase + UCR1); 2044c868cbb7SEduardo Valentin sport->saved_reg[1] = readl(sport->port.membase + UCR2); 2045c868cbb7SEduardo Valentin sport->saved_reg[2] = readl(sport->port.membase + UCR3); 2046c868cbb7SEduardo Valentin sport->saved_reg[3] = readl(sport->port.membase + UCR4); 2047c868cbb7SEduardo Valentin sport->saved_reg[4] = readl(sport->port.membase + UFCR); 2048c868cbb7SEduardo Valentin sport->saved_reg[5] = readl(sport->port.membase + UESC); 2049c868cbb7SEduardo Valentin sport->saved_reg[6] = readl(sport->port.membase + UTIM); 2050c868cbb7SEduardo Valentin sport->saved_reg[7] = readl(sport->port.membase + UBIR); 2051c868cbb7SEduardo Valentin sport->saved_reg[8] = readl(sport->port.membase + UBMR); 2052c868cbb7SEduardo Valentin sport->saved_reg[9] = readl(sport->port.membase + IMX21_UTS); 2053c868cbb7SEduardo Valentin sport->context_saved = true; 2054c868cbb7SEduardo Valentin } 2055c868cbb7SEduardo Valentin 2056189550b8SEduardo Valentin static void serial_imx_enable_wakeup(struct imx_port *sport, bool on) 2057189550b8SEduardo Valentin { 2058189550b8SEduardo Valentin unsigned int val; 2059189550b8SEduardo Valentin 2060189550b8SEduardo Valentin val = readl(sport->port.membase + UCR3); 2061189550b8SEduardo Valentin if (on) 2062189550b8SEduardo Valentin val |= UCR3_AWAKEN; 2063189550b8SEduardo Valentin else 2064189550b8SEduardo Valentin val &= ~UCR3_AWAKEN; 2065189550b8SEduardo Valentin writel(val, sport->port.membase + UCR3); 2066bc85734bSEduardo Valentin 2067bc85734bSEduardo Valentin val = readl(sport->port.membase + UCR1); 2068bc85734bSEduardo Valentin if (on) 2069bc85734bSEduardo Valentin val |= UCR1_RTSDEN; 2070bc85734bSEduardo Valentin else 2071bc85734bSEduardo Valentin val &= ~UCR1_RTSDEN; 2072bc85734bSEduardo Valentin writel(val, sport->port.membase + UCR1); 2073189550b8SEduardo Valentin } 2074189550b8SEduardo Valentin 207590bb6bd3SShenwei Wang static int imx_serial_port_suspend_noirq(struct device *dev) 207690bb6bd3SShenwei Wang { 207790bb6bd3SShenwei Wang struct platform_device *pdev = to_platform_device(dev); 207890bb6bd3SShenwei Wang struct imx_port *sport = platform_get_drvdata(pdev); 207990bb6bd3SShenwei Wang int ret; 208090bb6bd3SShenwei Wang 208190bb6bd3SShenwei Wang ret = clk_enable(sport->clk_ipg); 208290bb6bd3SShenwei Wang if (ret) 208390bb6bd3SShenwei Wang return ret; 208490bb6bd3SShenwei Wang 2085c868cbb7SEduardo Valentin serial_imx_save_context(sport); 208690bb6bd3SShenwei Wang 208790bb6bd3SShenwei Wang clk_disable(sport->clk_ipg); 208890bb6bd3SShenwei Wang 208990bb6bd3SShenwei Wang return 0; 209090bb6bd3SShenwei Wang } 209190bb6bd3SShenwei Wang 209290bb6bd3SShenwei Wang static int imx_serial_port_resume_noirq(struct device *dev) 209390bb6bd3SShenwei Wang { 209490bb6bd3SShenwei Wang struct platform_device *pdev = to_platform_device(dev); 209590bb6bd3SShenwei Wang struct imx_port *sport = platform_get_drvdata(pdev); 209690bb6bd3SShenwei Wang int ret; 209790bb6bd3SShenwei Wang 209890bb6bd3SShenwei Wang ret = clk_enable(sport->clk_ipg); 209990bb6bd3SShenwei Wang if (ret) 210090bb6bd3SShenwei Wang return ret; 210190bb6bd3SShenwei Wang 2102c868cbb7SEduardo Valentin serial_imx_restore_context(sport); 210390bb6bd3SShenwei Wang 210490bb6bd3SShenwei Wang clk_disable(sport->clk_ipg); 210590bb6bd3SShenwei Wang 210690bb6bd3SShenwei Wang return 0; 210790bb6bd3SShenwei Wang } 210890bb6bd3SShenwei Wang 210990bb6bd3SShenwei Wang static int imx_serial_port_suspend(struct device *dev) 211090bb6bd3SShenwei Wang { 211190bb6bd3SShenwei Wang struct platform_device *pdev = to_platform_device(dev); 211290bb6bd3SShenwei Wang struct imx_port *sport = platform_get_drvdata(pdev); 211390bb6bd3SShenwei Wang 211490bb6bd3SShenwei Wang /* enable wakeup from i.MX UART */ 2115189550b8SEduardo Valentin serial_imx_enable_wakeup(sport, true); 211690bb6bd3SShenwei Wang 211790bb6bd3SShenwei Wang uart_suspend_port(&imx_reg, &sport->port); 211890bb6bd3SShenwei Wang 211990bb6bd3SShenwei Wang return 0; 212090bb6bd3SShenwei Wang } 212190bb6bd3SShenwei Wang 212290bb6bd3SShenwei Wang static int imx_serial_port_resume(struct device *dev) 212390bb6bd3SShenwei Wang { 212490bb6bd3SShenwei Wang struct platform_device *pdev = to_platform_device(dev); 212590bb6bd3SShenwei Wang struct imx_port *sport = platform_get_drvdata(pdev); 212690bb6bd3SShenwei Wang 212790bb6bd3SShenwei Wang /* disable wakeup from i.MX UART */ 2128189550b8SEduardo Valentin serial_imx_enable_wakeup(sport, false); 212990bb6bd3SShenwei Wang 213090bb6bd3SShenwei Wang uart_resume_port(&imx_reg, &sport->port); 213190bb6bd3SShenwei Wang 213290bb6bd3SShenwei Wang return 0; 213390bb6bd3SShenwei Wang } 213490bb6bd3SShenwei Wang 213590bb6bd3SShenwei Wang static const struct dev_pm_ops imx_serial_port_pm_ops = { 213690bb6bd3SShenwei Wang .suspend_noirq = imx_serial_port_suspend_noirq, 213790bb6bd3SShenwei Wang .resume_noirq = imx_serial_port_resume_noirq, 213890bb6bd3SShenwei Wang .suspend = imx_serial_port_suspend, 213990bb6bd3SShenwei Wang .resume = imx_serial_port_resume, 214090bb6bd3SShenwei Wang }; 214190bb6bd3SShenwei Wang 2142ab4382d2SGreg Kroah-Hartman static struct platform_driver serial_imx_driver = { 2143ab4382d2SGreg Kroah-Hartman .probe = serial_imx_probe, 2144ab4382d2SGreg Kroah-Hartman .remove = serial_imx_remove, 2145ab4382d2SGreg Kroah-Hartman 2146fe6b540aSShawn Guo .id_table = imx_uart_devtype, 2147ab4382d2SGreg Kroah-Hartman .driver = { 2148ab4382d2SGreg Kroah-Hartman .name = "imx-uart", 214922698aa2SShawn Guo .of_match_table = imx_uart_dt_ids, 215090bb6bd3SShenwei Wang .pm = &imx_serial_port_pm_ops, 2151ab4382d2SGreg Kroah-Hartman }, 2152ab4382d2SGreg Kroah-Hartman }; 2153ab4382d2SGreg Kroah-Hartman 2154ab4382d2SGreg Kroah-Hartman static int __init imx_serial_init(void) 2155ab4382d2SGreg Kroah-Hartman { 2156f0fd1b73SFabio Estevam int ret = uart_register_driver(&imx_reg); 2157ab4382d2SGreg Kroah-Hartman 2158ab4382d2SGreg Kroah-Hartman if (ret) 2159ab4382d2SGreg Kroah-Hartman return ret; 2160ab4382d2SGreg Kroah-Hartman 2161ab4382d2SGreg Kroah-Hartman ret = platform_driver_register(&serial_imx_driver); 2162ab4382d2SGreg Kroah-Hartman if (ret != 0) 2163ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&imx_reg); 2164ab4382d2SGreg Kroah-Hartman 2165f227824eSUwe Kleine-König return ret; 2166ab4382d2SGreg Kroah-Hartman } 2167ab4382d2SGreg Kroah-Hartman 2168ab4382d2SGreg Kroah-Hartman static void __exit imx_serial_exit(void) 2169ab4382d2SGreg Kroah-Hartman { 2170ab4382d2SGreg Kroah-Hartman platform_driver_unregister(&serial_imx_driver); 2171ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&imx_reg); 2172ab4382d2SGreg Kroah-Hartman } 2173ab4382d2SGreg Kroah-Hartman 2174ab4382d2SGreg Kroah-Hartman module_init(imx_serial_init); 2175ab4382d2SGreg Kroah-Hartman module_exit(imx_serial_exit); 2176ab4382d2SGreg Kroah-Hartman 2177ab4382d2SGreg Kroah-Hartman MODULE_AUTHOR("Sascha Hauer"); 2178ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("IMX generic serial port driver"); 2179ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2180ab4382d2SGreg Kroah-Hartman MODULE_ALIAS("platform:imx-uart"); 2181