1 /* 2 * Xilinx Zynq UltraScale+ MPSoC Quad-SPI (QSPI) controller driver 3 * (master mode only) 4 * 5 * Copyright (C) 2009 - 2015 Xilinx, Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 as published 9 * by the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 */ 12 13 #include <linux/clk.h> 14 #include <linux/delay.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/dmaengine.h> 17 #include <linux/interrupt.h> 18 #include <linux/io.h> 19 #include <linux/module.h> 20 #include <linux/of_irq.h> 21 #include <linux/of_address.h> 22 #include <linux/platform_device.h> 23 #include <linux/spi/spi.h> 24 #include <linux/spinlock.h> 25 #include <linux/workqueue.h> 26 27 /* Generic QSPI register offsets */ 28 #define GQSPI_CONFIG_OFST 0x00000100 29 #define GQSPI_ISR_OFST 0x00000104 30 #define GQSPI_IDR_OFST 0x0000010C 31 #define GQSPI_IER_OFST 0x00000108 32 #define GQSPI_IMASK_OFST 0x00000110 33 #define GQSPI_EN_OFST 0x00000114 34 #define GQSPI_TXD_OFST 0x0000011C 35 #define GQSPI_RXD_OFST 0x00000120 36 #define GQSPI_TX_THRESHOLD_OFST 0x00000128 37 #define GQSPI_RX_THRESHOLD_OFST 0x0000012C 38 #define GQSPI_LPBK_DLY_ADJ_OFST 0x00000138 39 #define GQSPI_GEN_FIFO_OFST 0x00000140 40 #define GQSPI_SEL_OFST 0x00000144 41 #define GQSPI_GF_THRESHOLD_OFST 0x00000150 42 #define GQSPI_FIFO_CTRL_OFST 0x0000014C 43 #define GQSPI_QSPIDMA_DST_CTRL_OFST 0x0000080C 44 #define GQSPI_QSPIDMA_DST_SIZE_OFST 0x00000804 45 #define GQSPI_QSPIDMA_DST_STS_OFST 0x00000808 46 #define GQSPI_QSPIDMA_DST_I_STS_OFST 0x00000814 47 #define GQSPI_QSPIDMA_DST_I_EN_OFST 0x00000818 48 #define GQSPI_QSPIDMA_DST_I_DIS_OFST 0x0000081C 49 #define GQSPI_QSPIDMA_DST_I_MASK_OFST 0x00000820 50 #define GQSPI_QSPIDMA_DST_ADDR_OFST 0x00000800 51 #define GQSPI_QSPIDMA_DST_ADDR_MSB_OFST 0x00000828 52 53 /* GQSPI register bit masks */ 54 #define GQSPI_SEL_MASK 0x00000001 55 #define GQSPI_EN_MASK 0x00000001 56 #define GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK 0x00000020 57 #define GQSPI_ISR_WR_TO_CLR_MASK 0x00000002 58 #define GQSPI_IDR_ALL_MASK 0x00000FBE 59 #define GQSPI_CFG_MODE_EN_MASK 0xC0000000 60 #define GQSPI_CFG_GEN_FIFO_START_MODE_MASK 0x20000000 61 #define GQSPI_CFG_ENDIAN_MASK 0x04000000 62 #define GQSPI_CFG_EN_POLL_TO_MASK 0x00100000 63 #define GQSPI_CFG_WP_HOLD_MASK 0x00080000 64 #define GQSPI_CFG_BAUD_RATE_DIV_MASK 0x00000038 65 #define GQSPI_CFG_CLK_PHA_MASK 0x00000004 66 #define GQSPI_CFG_CLK_POL_MASK 0x00000002 67 #define GQSPI_CFG_START_GEN_FIFO_MASK 0x10000000 68 #define GQSPI_GENFIFO_IMM_DATA_MASK 0x000000FF 69 #define GQSPI_GENFIFO_DATA_XFER 0x00000100 70 #define GQSPI_GENFIFO_EXP 0x00000200 71 #define GQSPI_GENFIFO_MODE_SPI 0x00000400 72 #define GQSPI_GENFIFO_MODE_DUALSPI 0x00000800 73 #define GQSPI_GENFIFO_MODE_QUADSPI 0x00000C00 74 #define GQSPI_GENFIFO_MODE_MASK 0x00000C00 75 #define GQSPI_GENFIFO_CS_LOWER 0x00001000 76 #define GQSPI_GENFIFO_CS_UPPER 0x00002000 77 #define GQSPI_GENFIFO_BUS_LOWER 0x00004000 78 #define GQSPI_GENFIFO_BUS_UPPER 0x00008000 79 #define GQSPI_GENFIFO_BUS_BOTH 0x0000C000 80 #define GQSPI_GENFIFO_BUS_MASK 0x0000C000 81 #define GQSPI_GENFIFO_TX 0x00010000 82 #define GQSPI_GENFIFO_RX 0x00020000 83 #define GQSPI_GENFIFO_STRIPE 0x00040000 84 #define GQSPI_GENFIFO_POLL 0x00080000 85 #define GQSPI_GENFIFO_EXP_START 0x00000100 86 #define GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK 0x00000004 87 #define GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK 0x00000002 88 #define GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK 0x00000001 89 #define GQSPI_ISR_RXEMPTY_MASK 0x00000800 90 #define GQSPI_ISR_GENFIFOFULL_MASK 0x00000400 91 #define GQSPI_ISR_GENFIFONOT_FULL_MASK 0x00000200 92 #define GQSPI_ISR_TXEMPTY_MASK 0x00000100 93 #define GQSPI_ISR_GENFIFOEMPTY_MASK 0x00000080 94 #define GQSPI_ISR_RXFULL_MASK 0x00000020 95 #define GQSPI_ISR_RXNEMPTY_MASK 0x00000010 96 #define GQSPI_ISR_TXFULL_MASK 0x00000008 97 #define GQSPI_ISR_TXNOT_FULL_MASK 0x00000004 98 #define GQSPI_ISR_POLL_TIME_EXPIRE_MASK 0x00000002 99 #define GQSPI_IER_TXNOT_FULL_MASK 0x00000004 100 #define GQSPI_IER_RXEMPTY_MASK 0x00000800 101 #define GQSPI_IER_POLL_TIME_EXPIRE_MASK 0x00000002 102 #define GQSPI_IER_RXNEMPTY_MASK 0x00000010 103 #define GQSPI_IER_GENFIFOEMPTY_MASK 0x00000080 104 #define GQSPI_IER_TXEMPTY_MASK 0x00000100 105 #define GQSPI_QSPIDMA_DST_INTR_ALL_MASK 0x000000FE 106 #define GQSPI_QSPIDMA_DST_STS_WTC 0x0000E000 107 #define GQSPI_CFG_MODE_EN_DMA_MASK 0x80000000 108 #define GQSPI_ISR_IDR_MASK 0x00000994 109 #define GQSPI_QSPIDMA_DST_I_EN_DONE_MASK 0x00000002 110 #define GQSPI_QSPIDMA_DST_I_STS_DONE_MASK 0x00000002 111 #define GQSPI_IRQ_MASK 0x00000980 112 113 #define GQSPI_CFG_BAUD_RATE_DIV_SHIFT 3 114 #define GQSPI_GENFIFO_CS_SETUP 0x4 115 #define GQSPI_GENFIFO_CS_HOLD 0x3 116 #define GQSPI_TXD_DEPTH 64 117 #define GQSPI_RX_FIFO_THRESHOLD 32 118 #define GQSPI_RX_FIFO_FILL (GQSPI_RX_FIFO_THRESHOLD * 4) 119 #define GQSPI_TX_FIFO_THRESHOLD_RESET_VAL 32 120 #define GQSPI_TX_FIFO_FILL (GQSPI_TXD_DEPTH -\ 121 GQSPI_TX_FIFO_THRESHOLD_RESET_VAL) 122 #define GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL 0X10 123 #define GQSPI_QSPIDMA_DST_CTRL_RESET_VAL 0x803FFA00 124 #define GQSPI_SELECT_FLASH_CS_LOWER 0x1 125 #define GQSPI_SELECT_FLASH_CS_UPPER 0x2 126 #define GQSPI_SELECT_FLASH_CS_BOTH 0x3 127 #define GQSPI_SELECT_FLASH_BUS_LOWER 0x1 128 #define GQSPI_SELECT_FLASH_BUS_UPPER 0x2 129 #define GQSPI_SELECT_FLASH_BUS_BOTH 0x3 130 #define GQSPI_BAUD_DIV_MAX 7 /* Baud rate divisor maximum */ 131 #define GQSPI_BAUD_DIV_SHIFT 2 /* Baud rate divisor shift */ 132 #define GQSPI_SELECT_MODE_SPI 0x1 133 #define GQSPI_SELECT_MODE_DUALSPI 0x2 134 #define GQSPI_SELECT_MODE_QUADSPI 0x4 135 #define GQSPI_DMA_UNALIGN 0x3 136 #define GQSPI_DEFAULT_NUM_CS 1 /* Default number of chip selects */ 137 138 enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA}; 139 140 /** 141 * struct zynqmp_qspi - Defines qspi driver instance 142 * @regs: Virtual address of the QSPI controller registers 143 * @refclk: Pointer to the peripheral clock 144 * @pclk: Pointer to the APB clock 145 * @irq: IRQ number 146 * @dev: Pointer to struct device 147 * @txbuf: Pointer to the TX buffer 148 * @rxbuf: Pointer to the RX buffer 149 * @bytes_to_transfer: Number of bytes left to transfer 150 * @bytes_to_receive: Number of bytes left to receive 151 * @genfifocs: Used for chip select 152 * @genfifobus: Used to select the upper or lower bus 153 * @dma_rx_bytes: Remaining bytes to receive by DMA mode 154 * @dma_addr: DMA address after mapping the kernel buffer 155 * @genfifoentry: Used for storing the genfifoentry instruction. 156 * @mode: Defines the mode in which QSPI is operating 157 */ 158 struct zynqmp_qspi { 159 void __iomem *regs; 160 struct clk *refclk; 161 struct clk *pclk; 162 int irq; 163 struct device *dev; 164 const void *txbuf; 165 void *rxbuf; 166 int bytes_to_transfer; 167 int bytes_to_receive; 168 u32 genfifocs; 169 u32 genfifobus; 170 u32 dma_rx_bytes; 171 dma_addr_t dma_addr; 172 u32 genfifoentry; 173 enum mode_type mode; 174 }; 175 176 /** 177 * zynqmp_gqspi_read: For GQSPI controller read operation 178 * @xqspi: Pointer to the zynqmp_qspi structure 179 * @offset: Offset from where to read 180 */ 181 static u32 zynqmp_gqspi_read(struct zynqmp_qspi *xqspi, u32 offset) 182 { 183 return readl_relaxed(xqspi->regs + offset); 184 } 185 186 /** 187 * zynqmp_gqspi_write: For GQSPI controller write operation 188 * @xqspi: Pointer to the zynqmp_qspi structure 189 * @offset: Offset where to write 190 * @val: Value to be written 191 */ 192 static inline void zynqmp_gqspi_write(struct zynqmp_qspi *xqspi, u32 offset, 193 u32 val) 194 { 195 writel_relaxed(val, (xqspi->regs + offset)); 196 } 197 198 /** 199 * zynqmp_gqspi_selectslave: For selection of slave device 200 * @instanceptr: Pointer to the zynqmp_qspi structure 201 * @flashcs: For chip select 202 * @flashbus: To check which bus is selected- upper or lower 203 */ 204 static void zynqmp_gqspi_selectslave(struct zynqmp_qspi *instanceptr, 205 u8 slavecs, u8 slavebus) 206 { 207 /* 208 * Bus and CS lines selected here will be updated in the instance and 209 * used for subsequent GENFIFO entries during transfer. 210 */ 211 212 /* Choose slave select line */ 213 switch (slavecs) { 214 case GQSPI_SELECT_FLASH_CS_BOTH: 215 instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER | 216 GQSPI_GENFIFO_CS_UPPER; 217 break; 218 case GQSPI_SELECT_FLASH_CS_UPPER: 219 instanceptr->genfifocs = GQSPI_GENFIFO_CS_UPPER; 220 break; 221 case GQSPI_SELECT_FLASH_CS_LOWER: 222 instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER; 223 break; 224 default: 225 dev_warn(instanceptr->dev, "Invalid slave select\n"); 226 } 227 228 /* Choose the bus */ 229 switch (slavebus) { 230 case GQSPI_SELECT_FLASH_BUS_BOTH: 231 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER | 232 GQSPI_GENFIFO_BUS_UPPER; 233 break; 234 case GQSPI_SELECT_FLASH_BUS_UPPER: 235 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_UPPER; 236 break; 237 case GQSPI_SELECT_FLASH_BUS_LOWER: 238 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER; 239 break; 240 default: 241 dev_warn(instanceptr->dev, "Invalid slave bus\n"); 242 } 243 } 244 245 /** 246 * zynqmp_qspi_init_hw: Initialize the hardware 247 * @xqspi: Pointer to the zynqmp_qspi structure 248 * 249 * The default settings of the QSPI controller's configurable parameters on 250 * reset are 251 * - Master mode 252 * - TX threshold set to 1 253 * - RX threshold set to 1 254 * - Flash memory interface mode enabled 255 * This function performs the following actions 256 * - Disable and clear all the interrupts 257 * - Enable manual slave select 258 * - Enable manual start 259 * - Deselect all the chip select lines 260 * - Set the little endian mode of TX FIFO and 261 * - Enable the QSPI controller 262 */ 263 static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi) 264 { 265 u32 config_reg; 266 267 /* Select the GQSPI mode */ 268 zynqmp_gqspi_write(xqspi, GQSPI_SEL_OFST, GQSPI_SEL_MASK); 269 /* Clear and disable interrupts */ 270 zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST, 271 zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST) | 272 GQSPI_ISR_WR_TO_CLR_MASK); 273 /* Clear the DMA STS */ 274 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST, 275 zynqmp_gqspi_read(xqspi, 276 GQSPI_QSPIDMA_DST_I_STS_OFST)); 277 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_STS_OFST, 278 zynqmp_gqspi_read(xqspi, 279 GQSPI_QSPIDMA_DST_STS_OFST) | 280 GQSPI_QSPIDMA_DST_STS_WTC); 281 zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_IDR_ALL_MASK); 282 zynqmp_gqspi_write(xqspi, 283 GQSPI_QSPIDMA_DST_I_DIS_OFST, 284 GQSPI_QSPIDMA_DST_INTR_ALL_MASK); 285 /* Disable the GQSPI */ 286 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0); 287 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); 288 config_reg &= ~GQSPI_CFG_MODE_EN_MASK; 289 /* Manual start */ 290 config_reg |= GQSPI_CFG_GEN_FIFO_START_MODE_MASK; 291 /* Little endian by default */ 292 config_reg &= ~GQSPI_CFG_ENDIAN_MASK; 293 /* Disable poll time out */ 294 config_reg &= ~GQSPI_CFG_EN_POLL_TO_MASK; 295 /* Set hold bit */ 296 config_reg |= GQSPI_CFG_WP_HOLD_MASK; 297 /* Clear pre-scalar by default */ 298 config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK; 299 /* CPHA 0 */ 300 config_reg &= ~GQSPI_CFG_CLK_PHA_MASK; 301 /* CPOL 0 */ 302 config_reg &= ~GQSPI_CFG_CLK_POL_MASK; 303 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); 304 305 /* Clear the TX and RX FIFO */ 306 zynqmp_gqspi_write(xqspi, GQSPI_FIFO_CTRL_OFST, 307 GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK | 308 GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK | 309 GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK); 310 /* Set by default to allow for high frequencies */ 311 zynqmp_gqspi_write(xqspi, GQSPI_LPBK_DLY_ADJ_OFST, 312 zynqmp_gqspi_read(xqspi, GQSPI_LPBK_DLY_ADJ_OFST) | 313 GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK); 314 /* Reset thresholds */ 315 zynqmp_gqspi_write(xqspi, GQSPI_TX_THRESHOLD_OFST, 316 GQSPI_TX_FIFO_THRESHOLD_RESET_VAL); 317 zynqmp_gqspi_write(xqspi, GQSPI_RX_THRESHOLD_OFST, 318 GQSPI_RX_FIFO_THRESHOLD); 319 zynqmp_gqspi_write(xqspi, GQSPI_GF_THRESHOLD_OFST, 320 GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL); 321 zynqmp_gqspi_selectslave(xqspi, 322 GQSPI_SELECT_FLASH_CS_LOWER, 323 GQSPI_SELECT_FLASH_BUS_LOWER); 324 /* Initialize DMA */ 325 zynqmp_gqspi_write(xqspi, 326 GQSPI_QSPIDMA_DST_CTRL_OFST, 327 GQSPI_QSPIDMA_DST_CTRL_RESET_VAL); 328 329 /* Enable the GQSPI */ 330 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK); 331 } 332 333 /** 334 * zynqmp_qspi_copy_read_data: Copy data to RX buffer 335 * @xqspi: Pointer to the zynqmp_qspi structure 336 * @data: The variable where data is stored 337 * @size: Number of bytes to be copied from data to RX buffer 338 */ 339 static void zynqmp_qspi_copy_read_data(struct zynqmp_qspi *xqspi, 340 ulong data, u8 size) 341 { 342 memcpy(xqspi->rxbuf, &data, size); 343 xqspi->rxbuf += size; 344 xqspi->bytes_to_receive -= size; 345 } 346 347 /** 348 * zynqmp_prepare_transfer_hardware: Prepares hardware for transfer. 349 * @master: Pointer to the spi_master structure which provides 350 * information about the controller. 351 * 352 * This function enables SPI master controller. 353 * 354 * Return: 0 on success; error value otherwise 355 */ 356 static int zynqmp_prepare_transfer_hardware(struct spi_master *master) 357 { 358 struct zynqmp_qspi *xqspi = spi_master_get_devdata(master); 359 int ret; 360 361 ret = clk_enable(xqspi->refclk); 362 if (ret) 363 goto clk_err; 364 365 ret = clk_enable(xqspi->pclk); 366 if (ret) 367 goto clk_err; 368 369 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK); 370 return 0; 371 clk_err: 372 return ret; 373 } 374 375 /** 376 * zynqmp_unprepare_transfer_hardware: Relaxes hardware after transfer 377 * @master: Pointer to the spi_master structure which provides 378 * information about the controller. 379 * 380 * This function disables the SPI master controller. 381 * 382 * Return: Always 0 383 */ 384 static int zynqmp_unprepare_transfer_hardware(struct spi_master *master) 385 { 386 struct zynqmp_qspi *xqspi = spi_master_get_devdata(master); 387 388 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0); 389 clk_disable(xqspi->refclk); 390 clk_disable(xqspi->pclk); 391 return 0; 392 } 393 394 /** 395 * zynqmp_qspi_chipselect: Select or deselect the chip select line 396 * @qspi: Pointer to the spi_device structure 397 * @is_high: Select(0) or deselect (1) the chip select line 398 */ 399 static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high) 400 { 401 struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master); 402 ulong timeout; 403 u32 genfifoentry = 0x0, statusreg; 404 405 genfifoentry |= GQSPI_GENFIFO_MODE_SPI; 406 genfifoentry |= xqspi->genfifobus; 407 408 if (!is_high) { 409 genfifoentry |= xqspi->genfifocs; 410 genfifoentry |= GQSPI_GENFIFO_CS_SETUP; 411 } else { 412 genfifoentry |= GQSPI_GENFIFO_CS_HOLD; 413 } 414 415 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry); 416 417 /* Dummy generic FIFO entry */ 418 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0); 419 420 /* Manually start the generic FIFO command */ 421 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, 422 zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) | 423 GQSPI_CFG_START_GEN_FIFO_MASK); 424 425 timeout = jiffies + msecs_to_jiffies(1000); 426 427 /* Wait until the generic FIFO command is empty */ 428 do { 429 statusreg = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST); 430 431 if ((statusreg & GQSPI_ISR_GENFIFOEMPTY_MASK) && 432 (statusreg & GQSPI_ISR_TXEMPTY_MASK)) 433 break; 434 else 435 cpu_relax(); 436 } while (!time_after_eq(jiffies, timeout)); 437 438 if (time_after_eq(jiffies, timeout)) 439 dev_err(xqspi->dev, "Chip select timed out\n"); 440 } 441 442 /** 443 * zynqmp_qspi_setup_transfer: Configure QSPI controller for specified 444 * transfer 445 * @qspi: Pointer to the spi_device structure 446 * @transfer: Pointer to the spi_transfer structure which provides 447 * information about next transfer setup parameters 448 * 449 * Sets the operational mode of QSPI controller for the next QSPI transfer and 450 * sets the requested clock frequency. 451 * 452 * Return: Always 0 453 * 454 * Note: 455 * If the requested frequency is not an exact match with what can be 456 * obtained using the pre-scalar value, the driver sets the clock 457 * frequency which is lower than the requested frequency (maximum lower) 458 * for the transfer. 459 * 460 * If the requested frequency is higher or lower than that is supported 461 * by the QSPI controller the driver will set the highest or lowest 462 * frequency supported by controller. 463 */ 464 static int zynqmp_qspi_setup_transfer(struct spi_device *qspi, 465 struct spi_transfer *transfer) 466 { 467 struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master); 468 ulong clk_rate; 469 u32 config_reg, req_hz, baud_rate_val = 0; 470 471 if (transfer) 472 req_hz = transfer->speed_hz; 473 else 474 req_hz = qspi->max_speed_hz; 475 476 /* Set the clock frequency */ 477 /* If req_hz == 0, default to lowest speed */ 478 clk_rate = clk_get_rate(xqspi->refclk); 479 480 while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) && 481 (clk_rate / 482 (GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > req_hz) 483 baud_rate_val++; 484 485 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); 486 487 /* Set the QSPI clock phase and clock polarity */ 488 config_reg &= (~GQSPI_CFG_CLK_PHA_MASK) & (~GQSPI_CFG_CLK_POL_MASK); 489 490 if (qspi->mode & SPI_CPHA) 491 config_reg |= GQSPI_CFG_CLK_PHA_MASK; 492 if (qspi->mode & SPI_CPOL) 493 config_reg |= GQSPI_CFG_CLK_POL_MASK; 494 495 config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK; 496 config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT); 497 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); 498 return 0; 499 } 500 501 /** 502 * zynqmp_qspi_setup: Configure the QSPI controller 503 * @qspi: Pointer to the spi_device structure 504 * 505 * Sets the operational mode of QSPI controller for the next QSPI transfer, 506 * baud rate and divisor value to setup the requested qspi clock. 507 * 508 * Return: 0 on success; error value otherwise. 509 */ 510 static int zynqmp_qspi_setup(struct spi_device *qspi) 511 { 512 if (qspi->master->busy) 513 return -EBUSY; 514 return 0; 515 } 516 517 /** 518 * zynqmp_qspi_filltxfifo: Fills the TX FIFO as long as there is room in 519 * the FIFO or the bytes required to be 520 * transmitted. 521 * @xqspi: Pointer to the zynqmp_qspi structure 522 * @size: Number of bytes to be copied from TX buffer to TX FIFO 523 */ 524 static void zynqmp_qspi_filltxfifo(struct zynqmp_qspi *xqspi, int size) 525 { 526 u32 count = 0, intermediate; 527 528 while ((xqspi->bytes_to_transfer > 0) && (count < size)) { 529 memcpy(&intermediate, xqspi->txbuf, 4); 530 zynqmp_gqspi_write(xqspi, GQSPI_TXD_OFST, intermediate); 531 532 if (xqspi->bytes_to_transfer >= 4) { 533 xqspi->txbuf += 4; 534 xqspi->bytes_to_transfer -= 4; 535 } else { 536 xqspi->txbuf += xqspi->bytes_to_transfer; 537 xqspi->bytes_to_transfer = 0; 538 } 539 count++; 540 } 541 } 542 543 /** 544 * zynqmp_qspi_readrxfifo: Fills the RX FIFO as long as there is room in 545 * the FIFO. 546 * @xqspi: Pointer to the zynqmp_qspi structure 547 * @size: Number of bytes to be copied from RX buffer to RX FIFO 548 */ 549 static void zynqmp_qspi_readrxfifo(struct zynqmp_qspi *xqspi, u32 size) 550 { 551 ulong data; 552 int count = 0; 553 554 while ((count < size) && (xqspi->bytes_to_receive > 0)) { 555 if (xqspi->bytes_to_receive >= 4) { 556 (*(u32 *) xqspi->rxbuf) = 557 zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST); 558 xqspi->rxbuf += 4; 559 xqspi->bytes_to_receive -= 4; 560 count += 4; 561 } else { 562 data = zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST); 563 count += xqspi->bytes_to_receive; 564 zynqmp_qspi_copy_read_data(xqspi, data, 565 xqspi->bytes_to_receive); 566 xqspi->bytes_to_receive = 0; 567 } 568 } 569 } 570 571 /** 572 * zynqmp_process_dma_irq: Handler for DMA done interrupt of QSPI 573 * controller 574 * @xqspi: zynqmp_qspi instance pointer 575 * 576 * This function handles DMA interrupt only. 577 */ 578 static void zynqmp_process_dma_irq(struct zynqmp_qspi *xqspi) 579 { 580 u32 config_reg, genfifoentry; 581 582 dma_unmap_single(xqspi->dev, xqspi->dma_addr, 583 xqspi->dma_rx_bytes, DMA_FROM_DEVICE); 584 xqspi->rxbuf += xqspi->dma_rx_bytes; 585 xqspi->bytes_to_receive -= xqspi->dma_rx_bytes; 586 xqspi->dma_rx_bytes = 0; 587 588 /* Disabling the DMA interrupts */ 589 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_DIS_OFST, 590 GQSPI_QSPIDMA_DST_I_EN_DONE_MASK); 591 592 if (xqspi->bytes_to_receive > 0) { 593 /* Switch to IO mode,for remaining bytes to receive */ 594 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); 595 config_reg &= ~GQSPI_CFG_MODE_EN_MASK; 596 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); 597 598 /* Initiate the transfer of remaining bytes */ 599 genfifoentry = xqspi->genfifoentry; 600 genfifoentry |= xqspi->bytes_to_receive; 601 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry); 602 603 /* Dummy generic FIFO entry */ 604 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0); 605 606 /* Manual start */ 607 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, 608 (zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) | 609 GQSPI_CFG_START_GEN_FIFO_MASK)); 610 611 /* Enable the RX interrupts for IO mode */ 612 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, 613 GQSPI_IER_GENFIFOEMPTY_MASK | 614 GQSPI_IER_RXNEMPTY_MASK | 615 GQSPI_IER_RXEMPTY_MASK); 616 } 617 } 618 619 /** 620 * zynqmp_qspi_irq: Interrupt service routine of the QSPI controller 621 * @irq: IRQ number 622 * @dev_id: Pointer to the xqspi structure 623 * 624 * This function handles TX empty only. 625 * On TX empty interrupt this function reads the received data from RX FIFO 626 * and fills the TX FIFO if there is any data remaining to be transferred. 627 * 628 * Return: IRQ_HANDLED when interrupt is handled 629 * IRQ_NONE otherwise. 630 */ 631 static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id) 632 { 633 struct spi_master *master = dev_id; 634 struct zynqmp_qspi *xqspi = spi_master_get_devdata(master); 635 int ret = IRQ_NONE; 636 u32 status, mask, dma_status = 0; 637 638 status = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST); 639 zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST, status); 640 mask = (status & ~(zynqmp_gqspi_read(xqspi, GQSPI_IMASK_OFST))); 641 642 /* Read and clear DMA status */ 643 if (xqspi->mode == GQSPI_MODE_DMA) { 644 dma_status = 645 zynqmp_gqspi_read(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST); 646 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST, 647 dma_status); 648 } 649 650 if (mask & GQSPI_ISR_TXNOT_FULL_MASK) { 651 zynqmp_qspi_filltxfifo(xqspi, GQSPI_TX_FIFO_FILL); 652 ret = IRQ_HANDLED; 653 } 654 655 if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK) { 656 zynqmp_process_dma_irq(xqspi); 657 ret = IRQ_HANDLED; 658 } else if (!(mask & GQSPI_IER_RXEMPTY_MASK) && 659 (mask & GQSPI_IER_GENFIFOEMPTY_MASK)) { 660 zynqmp_qspi_readrxfifo(xqspi, GQSPI_RX_FIFO_FILL); 661 ret = IRQ_HANDLED; 662 } 663 664 if ((xqspi->bytes_to_receive == 0) && (xqspi->bytes_to_transfer == 0) 665 && ((status & GQSPI_IRQ_MASK) == GQSPI_IRQ_MASK)) { 666 zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_ISR_IDR_MASK); 667 spi_finalize_current_transfer(master); 668 ret = IRQ_HANDLED; 669 } 670 return ret; 671 } 672 673 /** 674 * zynqmp_qspi_selectspimode: Selects SPI mode - x1 or x2 or x4. 675 * @xqspi: xqspi is a pointer to the GQSPI instance 676 * @spimode: spimode - SPI or DUAL or QUAD. 677 * Return: Mask to set desired SPI mode in GENFIFO entry. 678 */ 679 static inline u32 zynqmp_qspi_selectspimode(struct zynqmp_qspi *xqspi, 680 u8 spimode) 681 { 682 u32 mask = 0; 683 684 switch (spimode) { 685 case GQSPI_SELECT_MODE_DUALSPI: 686 mask = GQSPI_GENFIFO_MODE_DUALSPI; 687 break; 688 case GQSPI_SELECT_MODE_QUADSPI: 689 mask = GQSPI_GENFIFO_MODE_QUADSPI; 690 break; 691 case GQSPI_SELECT_MODE_SPI: 692 mask = GQSPI_GENFIFO_MODE_SPI; 693 break; 694 default: 695 dev_warn(xqspi->dev, "Invalid SPI mode\n"); 696 } 697 698 return mask; 699 } 700 701 /** 702 * zynq_qspi_setuprxdma: This function sets up the RX DMA operation 703 * @xqspi: xqspi is a pointer to the GQSPI instance. 704 */ 705 static void zynq_qspi_setuprxdma(struct zynqmp_qspi *xqspi) 706 { 707 u32 rx_bytes, rx_rem, config_reg; 708 dma_addr_t addr; 709 u64 dma_align = (u64)(uintptr_t)xqspi->rxbuf; 710 711 if ((xqspi->bytes_to_receive < 8) || 712 ((dma_align & GQSPI_DMA_UNALIGN) != 0x0)) { 713 /* Setting to IO mode */ 714 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); 715 config_reg &= ~GQSPI_CFG_MODE_EN_MASK; 716 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); 717 xqspi->mode = GQSPI_MODE_IO; 718 xqspi->dma_rx_bytes = 0; 719 return; 720 } 721 722 rx_rem = xqspi->bytes_to_receive % 4; 723 rx_bytes = (xqspi->bytes_to_receive - rx_rem); 724 725 addr = dma_map_single(xqspi->dev, (void *)xqspi->rxbuf, 726 rx_bytes, DMA_FROM_DEVICE); 727 if (dma_mapping_error(xqspi->dev, addr)) 728 dev_err(xqspi->dev, "ERR:rxdma:memory not mapped\n"); 729 730 xqspi->dma_rx_bytes = rx_bytes; 731 xqspi->dma_addr = addr; 732 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_OFST, 733 (u32)(addr & 0xffffffff)); 734 addr = ((addr >> 16) >> 16); 735 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_MSB_OFST, 736 ((u32)addr) & 0xfff); 737 738 /* Enabling the DMA mode */ 739 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); 740 config_reg &= ~GQSPI_CFG_MODE_EN_MASK; 741 config_reg |= GQSPI_CFG_MODE_EN_DMA_MASK; 742 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); 743 744 /* Switch to DMA mode */ 745 xqspi->mode = GQSPI_MODE_DMA; 746 747 /* Write the number of bytes to transfer */ 748 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_SIZE_OFST, rx_bytes); 749 } 750 751 /** 752 * zynqmp_qspi_txrxsetup: This function checks the TX/RX buffers in 753 * the transfer and sets up the GENFIFO entries, 754 * TX FIFO as required. 755 * @xqspi: xqspi is a pointer to the GQSPI instance. 756 * @transfer: It is a pointer to the structure containing transfer data. 757 * @genfifoentry: genfifoentry is pointer to the variable in which 758 * GENFIFO mask is returned to calling function 759 */ 760 static void zynqmp_qspi_txrxsetup(struct zynqmp_qspi *xqspi, 761 struct spi_transfer *transfer, 762 u32 *genfifoentry) 763 { 764 u32 config_reg; 765 766 /* Transmit */ 767 if ((xqspi->txbuf != NULL) && (xqspi->rxbuf == NULL)) { 768 /* Setup data to be TXed */ 769 *genfifoentry &= ~GQSPI_GENFIFO_RX; 770 *genfifoentry |= GQSPI_GENFIFO_DATA_XFER; 771 *genfifoentry |= GQSPI_GENFIFO_TX; 772 *genfifoentry |= 773 zynqmp_qspi_selectspimode(xqspi, transfer->tx_nbits); 774 xqspi->bytes_to_transfer = transfer->len; 775 if (xqspi->mode == GQSPI_MODE_DMA) { 776 config_reg = zynqmp_gqspi_read(xqspi, 777 GQSPI_CONFIG_OFST); 778 config_reg &= ~GQSPI_CFG_MODE_EN_MASK; 779 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, 780 config_reg); 781 xqspi->mode = GQSPI_MODE_IO; 782 } 783 zynqmp_qspi_filltxfifo(xqspi, GQSPI_TXD_DEPTH); 784 /* Discard RX data */ 785 xqspi->bytes_to_receive = 0; 786 } else if ((xqspi->txbuf == NULL) && (xqspi->rxbuf != NULL)) { 787 /* Receive */ 788 789 /* TX auto fill */ 790 *genfifoentry &= ~GQSPI_GENFIFO_TX; 791 /* Setup RX */ 792 *genfifoentry |= GQSPI_GENFIFO_DATA_XFER; 793 *genfifoentry |= GQSPI_GENFIFO_RX; 794 *genfifoentry |= 795 zynqmp_qspi_selectspimode(xqspi, transfer->rx_nbits); 796 xqspi->bytes_to_transfer = 0; 797 xqspi->bytes_to_receive = transfer->len; 798 zynq_qspi_setuprxdma(xqspi); 799 } 800 } 801 802 /** 803 * zynqmp_qspi_start_transfer: Initiates the QSPI transfer 804 * @master: Pointer to the spi_master structure which provides 805 * information about the controller. 806 * @qspi: Pointer to the spi_device structure 807 * @transfer: Pointer to the spi_transfer structure which provide information 808 * about next transfer parameters 809 * 810 * This function fills the TX FIFO, starts the QSPI transfer, and waits for the 811 * transfer to be completed. 812 * 813 * Return: Number of bytes transferred in the last transfer 814 */ 815 static int zynqmp_qspi_start_transfer(struct spi_master *master, 816 struct spi_device *qspi, 817 struct spi_transfer *transfer) 818 { 819 struct zynqmp_qspi *xqspi = spi_master_get_devdata(master); 820 u32 genfifoentry = 0x0, transfer_len; 821 822 xqspi->txbuf = transfer->tx_buf; 823 xqspi->rxbuf = transfer->rx_buf; 824 825 zynqmp_qspi_setup_transfer(qspi, transfer); 826 827 genfifoentry |= xqspi->genfifocs; 828 genfifoentry |= xqspi->genfifobus; 829 830 zynqmp_qspi_txrxsetup(xqspi, transfer, &genfifoentry); 831 832 if (xqspi->mode == GQSPI_MODE_DMA) 833 transfer_len = xqspi->dma_rx_bytes; 834 else 835 transfer_len = transfer->len; 836 837 xqspi->genfifoentry = genfifoentry; 838 if ((transfer_len) < GQSPI_GENFIFO_IMM_DATA_MASK) { 839 genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK; 840 genfifoentry |= transfer_len; 841 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry); 842 } else { 843 int tempcount = transfer_len; 844 u32 exponent = 8; /* 2^8 = 256 */ 845 u8 imm_data = tempcount & 0xFF; 846 847 tempcount &= ~(tempcount & 0xFF); 848 /* Immediate entry */ 849 if (tempcount != 0) { 850 /* Exponent entries */ 851 genfifoentry |= GQSPI_GENFIFO_EXP; 852 while (tempcount != 0) { 853 if (tempcount & GQSPI_GENFIFO_EXP_START) { 854 genfifoentry &= 855 ~GQSPI_GENFIFO_IMM_DATA_MASK; 856 genfifoentry |= exponent; 857 zynqmp_gqspi_write(xqspi, 858 GQSPI_GEN_FIFO_OFST, 859 genfifoentry); 860 } 861 tempcount = tempcount >> 1; 862 exponent++; 863 } 864 } 865 if (imm_data != 0) { 866 genfifoentry &= ~GQSPI_GENFIFO_EXP; 867 genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK; 868 genfifoentry |= (u8) (imm_data & 0xFF); 869 zynqmp_gqspi_write(xqspi, 870 GQSPI_GEN_FIFO_OFST, genfifoentry); 871 } 872 } 873 874 if ((xqspi->mode == GQSPI_MODE_IO) && 875 (xqspi->rxbuf != NULL)) { 876 /* Dummy generic FIFO entry */ 877 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0); 878 } 879 880 /* Since we are using manual mode */ 881 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, 882 zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) | 883 GQSPI_CFG_START_GEN_FIFO_MASK); 884 885 if (xqspi->txbuf != NULL) 886 /* Enable interrupts for TX */ 887 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, 888 GQSPI_IER_TXEMPTY_MASK | 889 GQSPI_IER_GENFIFOEMPTY_MASK | 890 GQSPI_IER_TXNOT_FULL_MASK); 891 892 if (xqspi->rxbuf != NULL) { 893 /* Enable interrupts for RX */ 894 if (xqspi->mode == GQSPI_MODE_DMA) { 895 /* Enable DMA interrupts */ 896 zynqmp_gqspi_write(xqspi, 897 GQSPI_QSPIDMA_DST_I_EN_OFST, 898 GQSPI_QSPIDMA_DST_I_EN_DONE_MASK); 899 } else { 900 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, 901 GQSPI_IER_GENFIFOEMPTY_MASK | 902 GQSPI_IER_RXNEMPTY_MASK | 903 GQSPI_IER_RXEMPTY_MASK); 904 } 905 } 906 907 return transfer->len; 908 } 909 910 /** 911 * zynqmp_qspi_suspend: Suspend method for the QSPI driver 912 * @_dev: Address of the platform_device structure 913 * 914 * This function stops the QSPI driver queue and disables the QSPI controller 915 * 916 * Return: Always 0 917 */ 918 static int __maybe_unused zynqmp_qspi_suspend(struct device *dev) 919 { 920 struct platform_device *pdev = container_of(dev, 921 struct platform_device, 922 dev); 923 struct spi_master *master = platform_get_drvdata(pdev); 924 925 spi_master_suspend(master); 926 927 zynqmp_unprepare_transfer_hardware(master); 928 929 return 0; 930 } 931 932 /** 933 * zynqmp_qspi_resume: Resume method for the QSPI driver 934 * @dev: Address of the platform_device structure 935 * 936 * The function starts the QSPI driver queue and initializes the QSPI 937 * controller 938 * 939 * Return: 0 on success; error value otherwise 940 */ 941 static int __maybe_unused zynqmp_qspi_resume(struct device *dev) 942 { 943 struct platform_device *pdev = container_of(dev, 944 struct platform_device, 945 dev); 946 struct spi_master *master = platform_get_drvdata(pdev); 947 struct zynqmp_qspi *xqspi = spi_master_get_devdata(master); 948 int ret = 0; 949 950 ret = clk_enable(xqspi->pclk); 951 if (ret) { 952 dev_err(dev, "Cannot enable APB clock.\n"); 953 return ret; 954 } 955 956 ret = clk_enable(xqspi->refclk); 957 if (ret) { 958 dev_err(dev, "Cannot enable device clock.\n"); 959 clk_disable(xqspi->pclk); 960 return ret; 961 } 962 963 spi_master_resume(master); 964 965 return 0; 966 } 967 968 static SIMPLE_DEV_PM_OPS(zynqmp_qspi_dev_pm_ops, zynqmp_qspi_suspend, 969 zynqmp_qspi_resume); 970 971 /** 972 * zynqmp_qspi_probe: Probe method for the QSPI driver 973 * @pdev: Pointer to the platform_device structure 974 * 975 * This function initializes the driver data structures and the hardware. 976 * 977 * Return: 0 on success; error value otherwise 978 */ 979 static int zynqmp_qspi_probe(struct platform_device *pdev) 980 { 981 int ret = 0; 982 struct spi_master *master; 983 struct zynqmp_qspi *xqspi; 984 struct resource *res; 985 struct device *dev = &pdev->dev; 986 987 master = spi_alloc_master(&pdev->dev, sizeof(*xqspi)); 988 if (!master) 989 return -ENOMEM; 990 991 xqspi = spi_master_get_devdata(master); 992 master->dev.of_node = pdev->dev.of_node; 993 platform_set_drvdata(pdev, master); 994 995 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 996 xqspi->regs = devm_ioremap_resource(&pdev->dev, res); 997 if (IS_ERR(xqspi->regs)) { 998 ret = PTR_ERR(xqspi->regs); 999 goto remove_master; 1000 } 1001 1002 xqspi->dev = dev; 1003 xqspi->pclk = devm_clk_get(&pdev->dev, "pclk"); 1004 if (IS_ERR(xqspi->pclk)) { 1005 dev_err(dev, "pclk clock not found.\n"); 1006 ret = PTR_ERR(xqspi->pclk); 1007 goto remove_master; 1008 } 1009 1010 ret = clk_prepare_enable(xqspi->pclk); 1011 if (ret) { 1012 dev_err(dev, "Unable to enable APB clock.\n"); 1013 goto remove_master; 1014 } 1015 1016 xqspi->refclk = devm_clk_get(&pdev->dev, "ref_clk"); 1017 if (IS_ERR(xqspi->refclk)) { 1018 dev_err(dev, "ref_clk clock not found.\n"); 1019 ret = PTR_ERR(xqspi->refclk); 1020 goto clk_dis_pclk; 1021 } 1022 1023 ret = clk_prepare_enable(xqspi->refclk); 1024 if (ret) { 1025 dev_err(dev, "Unable to enable device clock.\n"); 1026 goto clk_dis_pclk; 1027 } 1028 1029 /* QSPI controller initializations */ 1030 zynqmp_qspi_init_hw(xqspi); 1031 1032 xqspi->irq = platform_get_irq(pdev, 0); 1033 if (xqspi->irq <= 0) { 1034 ret = -ENXIO; 1035 dev_err(dev, "irq resource not found\n"); 1036 goto clk_dis_all; 1037 } 1038 ret = devm_request_irq(&pdev->dev, xqspi->irq, zynqmp_qspi_irq, 1039 0, pdev->name, master); 1040 if (ret != 0) { 1041 ret = -ENXIO; 1042 dev_err(dev, "request_irq failed\n"); 1043 goto clk_dis_all; 1044 } 1045 1046 master->num_chipselect = GQSPI_DEFAULT_NUM_CS; 1047 1048 master->setup = zynqmp_qspi_setup; 1049 master->set_cs = zynqmp_qspi_chipselect; 1050 master->transfer_one = zynqmp_qspi_start_transfer; 1051 master->prepare_transfer_hardware = zynqmp_prepare_transfer_hardware; 1052 master->unprepare_transfer_hardware = 1053 zynqmp_unprepare_transfer_hardware; 1054 master->max_speed_hz = clk_get_rate(xqspi->refclk) / 2; 1055 master->bits_per_word_mask = SPI_BPW_MASK(8); 1056 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD | 1057 SPI_TX_DUAL | SPI_TX_QUAD; 1058 1059 if (master->dev.parent == NULL) 1060 master->dev.parent = &master->dev; 1061 1062 ret = spi_register_master(master); 1063 if (ret) 1064 goto clk_dis_all; 1065 1066 return 0; 1067 1068 clk_dis_all: 1069 clk_disable_unprepare(xqspi->refclk); 1070 clk_dis_pclk: 1071 clk_disable_unprepare(xqspi->pclk); 1072 remove_master: 1073 spi_master_put(master); 1074 1075 return ret; 1076 } 1077 1078 /** 1079 * zynqmp_qspi_remove: Remove method for the QSPI driver 1080 * @pdev: Pointer to the platform_device structure 1081 * 1082 * This function is called if a device is physically removed from the system or 1083 * if the driver module is being unloaded. It frees all resources allocated to 1084 * the device. 1085 * 1086 * Return: 0 Always 1087 */ 1088 static int zynqmp_qspi_remove(struct platform_device *pdev) 1089 { 1090 struct spi_master *master = platform_get_drvdata(pdev); 1091 struct zynqmp_qspi *xqspi = spi_master_get_devdata(master); 1092 1093 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0); 1094 clk_disable_unprepare(xqspi->refclk); 1095 clk_disable_unprepare(xqspi->pclk); 1096 1097 spi_unregister_master(master); 1098 1099 return 0; 1100 } 1101 1102 static const struct of_device_id zynqmp_qspi_of_match[] = { 1103 { .compatible = "xlnx,zynqmp-qspi-1.0", }, 1104 { /* End of table */ } 1105 }; 1106 1107 MODULE_DEVICE_TABLE(of, zynqmp_qspi_of_match); 1108 1109 static struct platform_driver zynqmp_qspi_driver = { 1110 .probe = zynqmp_qspi_probe, 1111 .remove = zynqmp_qspi_remove, 1112 .driver = { 1113 .name = "zynqmp-qspi", 1114 .of_match_table = zynqmp_qspi_of_match, 1115 .pm = &zynqmp_qspi_dev_pm_ops, 1116 }, 1117 }; 1118 1119 module_platform_driver(zynqmp_qspi_driver); 1120 1121 MODULE_AUTHOR("Xilinx, Inc."); 1122 MODULE_DESCRIPTION("Xilinx Zynqmp QSPI driver"); 1123 MODULE_LICENSE("GPL"); 1124