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[linux.git] / drivers / spi / spi-zynqmp-gqspi.c
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dfe11a11
RW		 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
138enum 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 */
158struct 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 */
181static 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 */
192static 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 */
204static 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;
861a481c 217 break;
dfe11a11
RW		 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 */
263static 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 */
339static 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 */
356static 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)
ba412e34 363 return ret;
dfe11a11
RW		 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;
371clk_err:
ba412e34 372 clk_disable(xqspi->refclk);
dfe11a11
RW		 373 return ret;
374}
375
376/**
377 * zynqmp_unprepare_transfer_hardware: Relaxes hardware after transfer
378 * @master: Pointer to the spi_master structure which provides
379 * information about the controller.
380 *
381 * This function disables the SPI master controller.
382 *
383 * Return: Always 0
384 */
385static int zynqmp_unprepare_transfer_hardware(struct spi_master *master)
386{
387 struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
388
389 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
390 clk_disable(xqspi->refclk);
391 clk_disable(xqspi->pclk);
392 return 0;
393}
394
395/**
396 * zynqmp_qspi_chipselect: Select or deselect the chip select line
397 * @qspi: Pointer to the spi_device structure
398 * @is_high: Select(0) or deselect (1) the chip select line
399 */
400static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high)
401{
402 struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master);
403 ulong timeout;
404 u32 genfifoentry = 0x0, statusreg;
405
406 genfifoentry |= GQSPI_GENFIFO_MODE_SPI;
407 genfifoentry |= xqspi->genfifobus;
408
409 if (!is_high) {
410 genfifoentry |= xqspi->genfifocs;
411 genfifoentry |= GQSPI_GENFIFO_CS_SETUP;
412 } else {
413 genfifoentry |= GQSPI_GENFIFO_CS_HOLD;
414 }
415
416 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
417
418 /* Dummy generic FIFO entry */
419 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
420
421 /* Manually start the generic FIFO command */
422 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
423 zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
424 GQSPI_CFG_START_GEN_FIFO_MASK);
425
426 timeout = jiffies + msecs_to_jiffies(1000);
427
428 /* Wait until the generic FIFO command is empty */
429 do {
430 statusreg = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
431
432 if ((statusreg & GQSPI_ISR_GENFIFOEMPTY_MASK) &&
433 (statusreg & GQSPI_ISR_TXEMPTY_MASK))
434 break;
435 else
436 cpu_relax();
437 } while (!time_after_eq(jiffies, timeout));
438
439 if (time_after_eq(jiffies, timeout))
440 dev_err(xqspi->dev, "Chip select timed out\n");
441}
442
443/**
444 * zynqmp_qspi_setup_transfer: Configure QSPI controller for specified
445 * transfer
446 * @qspi: Pointer to the spi_device structure
447 * @transfer: Pointer to the spi_transfer structure which provides
448 * information about next transfer setup parameters
449 *
450 * Sets the operational mode of QSPI controller for the next QSPI transfer and
451 * sets the requested clock frequency.
452 *
453 * Return: Always 0
454 *
455 * Note:
456 * If the requested frequency is not an exact match with what can be
457 * obtained using the pre-scalar value, the driver sets the clock
458 * frequency which is lower than the requested frequency (maximum lower)
459 * for the transfer.
460 *
461 * If the requested frequency is higher or lower than that is supported
462 * by the QSPI controller the driver will set the highest or lowest
463 * frequency supported by controller.
464 */
465static int zynqmp_qspi_setup_transfer(struct spi_device *qspi,
466 struct spi_transfer *transfer)
467{
468 struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master);
469 ulong clk_rate;
470 u32 config_reg, req_hz, baud_rate_val = 0;
471
472 if (transfer)
473 req_hz = transfer->speed_hz;
474 else
475 req_hz = qspi->max_speed_hz;
476
477 /* Set the clock frequency */
478 /* If req_hz == 0, default to lowest speed */
479 clk_rate = clk_get_rate(xqspi->refclk);
480
481 while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) &&
482 (clk_rate /
483 (GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > req_hz)
484 baud_rate_val++;
485
486 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
487
488 /* Set the QSPI clock phase and clock polarity */
489 config_reg &= (~GQSPI_CFG_CLK_PHA_MASK) & (~GQSPI_CFG_CLK_POL_MASK);
490
491 if (qspi->mode & SPI_CPHA)
492 config_reg |= GQSPI_CFG_CLK_PHA_MASK;
493 if (qspi->mode & SPI_CPOL)
494 config_reg |= GQSPI_CFG_CLK_POL_MASK;
495
496 config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
497 config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
498 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
499 return 0;
500}
501
502/**
503 * zynqmp_qspi_setup: Configure the QSPI controller
504 * @qspi: Pointer to the spi_device structure
505 *
506 * Sets the operational mode of QSPI controller for the next QSPI transfer,
507 * baud rate and divisor value to setup the requested qspi clock.
508 *
509 * Return: 0 on success; error value otherwise.
510 */
511static int zynqmp_qspi_setup(struct spi_device *qspi)
512{
513 if (qspi->master->busy)
514 return -EBUSY;
515 return 0;
516}
517
518/**
519 * zynqmp_qspi_filltxfifo: Fills the TX FIFO as long as there is room in
520 * the FIFO or the bytes required to be
521 * transmitted.
522 * @xqspi: Pointer to the zynqmp_qspi structure
523 * @size: Number of bytes to be copied from TX buffer to TX FIFO
524 */
525static void zynqmp_qspi_filltxfifo(struct zynqmp_qspi *xqspi, int size)
526{
527 u32 count = 0, intermediate;
528
529 while ((xqspi->bytes_to_transfer > 0) && (count < size)) {
530 memcpy(&intermediate, xqspi->txbuf, 4);
531 zynqmp_gqspi_write(xqspi, GQSPI_TXD_OFST, intermediate);
532
533 if (xqspi->bytes_to_transfer >= 4) {
534 xqspi->txbuf += 4;
535 xqspi->bytes_to_transfer -= 4;
536 } else {
537 xqspi->txbuf += xqspi->bytes_to_transfer;
538 xqspi->bytes_to_transfer = 0;
539 }
540 count++;
541 }
542}
543
544/**
545 * zynqmp_qspi_readrxfifo: Fills the RX FIFO as long as there is room in
546 * the FIFO.
547 * @xqspi: Pointer to the zynqmp_qspi structure
548 * @size: Number of bytes to be copied from RX buffer to RX FIFO
549 */
550static void zynqmp_qspi_readrxfifo(struct zynqmp_qspi *xqspi, u32 size)
551{
552 ulong data;
553 int count = 0;
554
555 while ((count < size) && (xqspi->bytes_to_receive > 0)) {
556 if (xqspi->bytes_to_receive >= 4) {
557 (*(u32 *) xqspi->rxbuf) =
558 zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST);
559 xqspi->rxbuf += 4;
560 xqspi->bytes_to_receive -= 4;
561 count += 4;
562 } else {
563 data = zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST);
564 count += xqspi->bytes_to_receive;
565 zynqmp_qspi_copy_read_data(xqspi, data,
566 xqspi->bytes_to_receive);
567 xqspi->bytes_to_receive = 0;
568 }
569 }
570}
571
572/**
573 * zynqmp_process_dma_irq: Handler for DMA done interrupt of QSPI
574 * controller
575 * @xqspi: zynqmp_qspi instance pointer
576 *
577 * This function handles DMA interrupt only.
578 */
579static void zynqmp_process_dma_irq(struct zynqmp_qspi *xqspi)
580{
581 u32 config_reg, genfifoentry;
582
583 dma_unmap_single(xqspi->dev, xqspi->dma_addr,
584 xqspi->dma_rx_bytes, DMA_FROM_DEVICE);
585 xqspi->rxbuf += xqspi->dma_rx_bytes;
586 xqspi->bytes_to_receive -= xqspi->dma_rx_bytes;
587 xqspi->dma_rx_bytes = 0;
588
589 /* Disabling the DMA interrupts */
590 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_DIS_OFST,
591 GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);
592
593 if (xqspi->bytes_to_receive > 0) {
594 /* Switch to IO mode,for remaining bytes to receive */
595 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
596 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
597 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
598
599 /* Initiate the transfer of remaining bytes */
600 genfifoentry = xqspi->genfifoentry;
601 genfifoentry |= xqspi->bytes_to_receive;
602 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
603
604 /* Dummy generic FIFO entry */
605 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
606
607 /* Manual start */
608 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
609 (zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
610 GQSPI_CFG_START_GEN_FIFO_MASK));
611
612 /* Enable the RX interrupts for IO mode */
613 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
614 GQSPI_IER_GENFIFOEMPTY_MASK |
615 GQSPI_IER_RXNEMPTY_MASK |
616 GQSPI_IER_RXEMPTY_MASK);
617 }
618}
619
620/**
621 * zynqmp_qspi_irq: Interrupt service routine of the QSPI controller
622 * @irq: IRQ number
623 * @dev_id: Pointer to the xqspi structure
624 *
625 * This function handles TX empty only.
626 * On TX empty interrupt this function reads the received data from RX FIFO
627 * and fills the TX FIFO if there is any data remaining to be transferred.
628 *
629 * Return: IRQ_HANDLED when interrupt is handled
630 * IRQ_NONE otherwise.
631 */
632static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
633{
634 struct spi_master *master = dev_id;
635 struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
636 int ret = IRQ_NONE;
637 u32 status, mask, dma_status = 0;
638
639 status = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
640 zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST, status);
641 mask = (status & ~(zynqmp_gqspi_read(xqspi, GQSPI_IMASK_OFST)));
642
643 /* Read and clear DMA status */
644 if (xqspi->mode == GQSPI_MODE_DMA) {
645 dma_status =
646 zynqmp_gqspi_read(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST);
647 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST,
648 dma_status);
649 }
650
651 if (mask & GQSPI_ISR_TXNOT_FULL_MASK) {
652 zynqmp_qspi_filltxfifo(xqspi, GQSPI_TX_FIFO_FILL);
653 ret = IRQ_HANDLED;
654 }
655
656 if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK) {
657 zynqmp_process_dma_irq(xqspi);
658 ret = IRQ_HANDLED;
659 } else if (!(mask & GQSPI_IER_RXEMPTY_MASK) &&
660 (mask & GQSPI_IER_GENFIFOEMPTY_MASK)) {
661 zynqmp_qspi_readrxfifo(xqspi, GQSPI_RX_FIFO_FILL);
662 ret = IRQ_HANDLED;
663 }
664
665 if ((xqspi->bytes_to_receive == 0) && (xqspi->bytes_to_transfer == 0)
666 && ((status & GQSPI_IRQ_MASK) == GQSPI_IRQ_MASK)) {
667 zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_ISR_IDR_MASK);
668 spi_finalize_current_transfer(master);
669 ret = IRQ_HANDLED;
670 }
671 return ret;
672}
673
674/**
675 * zynqmp_qspi_selectspimode: Selects SPI mode - x1 or x2 or x4.
676 * @xqspi: xqspi is a pointer to the GQSPI instance
677 * @spimode: spimode - SPI or DUAL or QUAD.
678 * Return: Mask to set desired SPI mode in GENFIFO entry.
679 */
680static inline u32 zynqmp_qspi_selectspimode(struct zynqmp_qspi *xqspi,
681 u8 spimode)
682{
683 u32 mask = 0;
684
685 switch (spimode) {
686 case GQSPI_SELECT_MODE_DUALSPI:
687 mask = GQSPI_GENFIFO_MODE_DUALSPI;
688 break;
689 case GQSPI_SELECT_MODE_QUADSPI:
690 mask = GQSPI_GENFIFO_MODE_QUADSPI;
691 break;
692 case GQSPI_SELECT_MODE_SPI:
693 mask = GQSPI_GENFIFO_MODE_SPI;
694 break;
695 default:
696 dev_warn(xqspi->dev, "Invalid SPI mode\n");
697 }
698
699 return mask;
700}
701
702/**
703 * zynq_qspi_setuprxdma: This function sets up the RX DMA operation
704 * @xqspi: xqspi is a pointer to the GQSPI instance.
705 */
706static void zynq_qspi_setuprxdma(struct zynqmp_qspi *xqspi)
707{
708 u32 rx_bytes, rx_rem, config_reg;
709 dma_addr_t addr;
710 u64 dma_align = (u64)(uintptr_t)xqspi->rxbuf;
711
712 if ((xqspi->bytes_to_receive < 8) ||
713 ((dma_align & GQSPI_DMA_UNALIGN) != 0x0)) {
714 /* Setting to IO mode */
715 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
716 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
717 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
718 xqspi->mode = GQSPI_MODE_IO;
719 xqspi->dma_rx_bytes = 0;
720 return;
721 }
722
723 rx_rem = xqspi->bytes_to_receive % 4;
724 rx_bytes = (xqspi->bytes_to_receive - rx_rem);
725
726 addr = dma_map_single(xqspi->dev, (void *)xqspi->rxbuf,
727 rx_bytes, DMA_FROM_DEVICE);
728 if (dma_mapping_error(xqspi->dev, addr))
729 dev_err(xqspi->dev, "ERR:rxdma:memory not mapped\n");
730
731 xqspi->dma_rx_bytes = rx_bytes;
732 xqspi->dma_addr = addr;
733 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_OFST,
734 (u32)(addr & 0xffffffff));
735 addr = ((addr >> 16) >> 16);
736 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_MSB_OFST,
737 ((u32)addr) & 0xfff);
738
739 /* Enabling the DMA mode */
740 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
741 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
742 config_reg |= GQSPI_CFG_MODE_EN_DMA_MASK;
743 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
744
745 /* Switch to DMA mode */
746 xqspi->mode = GQSPI_MODE_DMA;
747
748 /* Write the number of bytes to transfer */
749 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_SIZE_OFST, rx_bytes);
750}
751
752/**
753 * zynqmp_qspi_txrxsetup: This function checks the TX/RX buffers in
754 * the transfer and sets up the GENFIFO entries,
755 * TX FIFO as required.
756 * @xqspi: xqspi is a pointer to the GQSPI instance.
757 * @transfer: It is a pointer to the structure containing transfer data.
758 * @genfifoentry: genfifoentry is pointer to the variable in which
759 * GENFIFO mask is returned to calling function
760 */
761static void zynqmp_qspi_txrxsetup(struct zynqmp_qspi *xqspi,
762 struct spi_transfer *transfer,
763 u32 *genfifoentry)
764{
765 u32 config_reg;
766
767 /* Transmit */
768 if ((xqspi->txbuf != NULL) && (xqspi->rxbuf == NULL)) {
769 /* Setup data to be TXed */
770 *genfifoentry &= ~GQSPI_GENFIFO_RX;
771 *genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
772 *genfifoentry |= GQSPI_GENFIFO_TX;
773 *genfifoentry |=
774 zynqmp_qspi_selectspimode(xqspi, transfer->tx_nbits);
775 xqspi->bytes_to_transfer = transfer->len;
776 if (xqspi->mode == GQSPI_MODE_DMA) {
777 config_reg = zynqmp_gqspi_read(xqspi,
778 GQSPI_CONFIG_OFST);
779 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
780 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
781 config_reg);
782 xqspi->mode = GQSPI_MODE_IO;
783 }
784 zynqmp_qspi_filltxfifo(xqspi, GQSPI_TXD_DEPTH);
785 /* Discard RX data */
786 xqspi->bytes_to_receive = 0;
787 } else if ((xqspi->txbuf == NULL) && (xqspi->rxbuf != NULL)) {
788 /* Receive */
789
790 /* TX auto fill */
791 *genfifoentry &= ~GQSPI_GENFIFO_TX;
792 /* Setup RX */
793 *genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
794 *genfifoentry |= GQSPI_GENFIFO_RX;
795 *genfifoentry |=
796 zynqmp_qspi_selectspimode(xqspi, transfer->rx_nbits);
797 xqspi->bytes_to_transfer = 0;
798 xqspi->bytes_to_receive = transfer->len;
799 zynq_qspi_setuprxdma(xqspi);
800 }
801}
802
803/**
804 * zynqmp_qspi_start_transfer: Initiates the QSPI transfer
805 * @master: Pointer to the spi_master structure which provides
806 * information about the controller.
807 * @qspi: Pointer to the spi_device structure
808 * @transfer: Pointer to the spi_transfer structure which provide information
809 * about next transfer parameters
810 *
811 * This function fills the TX FIFO, starts the QSPI transfer, and waits for the
812 * transfer to be completed.
813 *
814 * Return: Number of bytes transferred in the last transfer
815 */
816static int zynqmp_qspi_start_transfer(struct spi_master *master,
817 struct spi_device *qspi,
818 struct spi_transfer *transfer)
819{
820 struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
821 u32 genfifoentry = 0x0, transfer_len;
822
823 xqspi->txbuf = transfer->tx_buf;
824 xqspi->rxbuf = transfer->rx_buf;
825
826 zynqmp_qspi_setup_transfer(qspi, transfer);
827
828 genfifoentry |= xqspi->genfifocs;
829 genfifoentry |= xqspi->genfifobus;
830
831 zynqmp_qspi_txrxsetup(xqspi, transfer, &genfifoentry);
832
833 if (xqspi->mode == GQSPI_MODE_DMA)
834 transfer_len = xqspi->dma_rx_bytes;
835 else
836 transfer_len = transfer->len;
837
838 xqspi->genfifoentry = genfifoentry;
839 if ((transfer_len) < GQSPI_GENFIFO_IMM_DATA_MASK) {
840 genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
841 genfifoentry |= transfer_len;
842 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
843 } else {
844 int tempcount = transfer_len;
845 u32 exponent = 8; /* 2^8 = 256 */
846 u8 imm_data = tempcount & 0xFF;
847
848 tempcount &= ~(tempcount & 0xFF);
849 /* Immediate entry */
850 if (tempcount != 0) {
851 /* Exponent entries */
852 genfifoentry |= GQSPI_GENFIFO_EXP;
853 while (tempcount != 0) {
854 if (tempcount & GQSPI_GENFIFO_EXP_START) {
855 genfifoentry &=
856 ~GQSPI_GENFIFO_IMM_DATA_MASK;
857 genfifoentry |= exponent;
858 zynqmp_gqspi_write(xqspi,
859 GQSPI_GEN_FIFO_OFST,
860 genfifoentry);
861 }
862 tempcount = tempcount >> 1;
863 exponent++;
864 }
865 }
866 if (imm_data != 0) {
867 genfifoentry &= ~GQSPI_GENFIFO_EXP;
868 genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
869 genfifoentry |= (u8) (imm_data & 0xFF);
870 zynqmp_gqspi_write(xqspi,
871 GQSPI_GEN_FIFO_OFST, genfifoentry);
872 }
873 }
874
875 if ((xqspi->mode == GQSPI_MODE_IO) &&
876 (xqspi->rxbuf != NULL)) {
877 /* Dummy generic FIFO entry */
878 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
879 }
880
881 /* Since we are using manual mode */
882 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
883 zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
884 GQSPI_CFG_START_GEN_FIFO_MASK);
885
886 if (xqspi->txbuf != NULL)
887 /* Enable interrupts for TX */
888 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
889 GQSPI_IER_TXEMPTY_MASK |
890 GQSPI_IER_GENFIFOEMPTY_MASK |
891 GQSPI_IER_TXNOT_FULL_MASK);
892
893 if (xqspi->rxbuf != NULL) {
894 /* Enable interrupts for RX */
895 if (xqspi->mode == GQSPI_MODE_DMA) {
896 /* Enable DMA interrupts */
897 zynqmp_gqspi_write(xqspi,
898 GQSPI_QSPIDMA_DST_I_EN_OFST,
899 GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);
900 } else {
901 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
902 GQSPI_IER_GENFIFOEMPTY_MASK |
903 GQSPI_IER_RXNEMPTY_MASK |
904 GQSPI_IER_RXEMPTY_MASK);
905 }
906 }
907
908 return transfer->len;
909}
910
911/**
912 * zynqmp_qspi_suspend: Suspend method for the QSPI driver
913 * @_dev: Address of the platform_device structure
914 *
915 * This function stops the QSPI driver queue and disables the QSPI controller
916 *
917 * Return: Always 0
918 */
919static int __maybe_unused zynqmp_qspi_suspend(struct device *dev)
920{
9d0c1c33 921 struct platform_device *pdev = to_platform_device(dev);
dfe11a11
RW		 922 struct spi_master *master = platform_get_drvdata(pdev);
923
924 spi_master_suspend(master);
925
926 zynqmp_unprepare_transfer_hardware(master);
927
928 return 0;
929}
930
931/**
932 * zynqmp_qspi_resume: Resume method for the QSPI driver
933 * @dev: Address of the platform_device structure
934 *
935 * The function starts the QSPI driver queue and initializes the QSPI
936 * controller
937 *
938 * Return: 0 on success; error value otherwise
939 */
940static int __maybe_unused zynqmp_qspi_resume(struct device *dev)
941{
9d0c1c33 942 struct platform_device *pdev = to_platform_device(dev);
dfe11a11
RW		 943 struct spi_master *master = platform_get_drvdata(pdev);
944 struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
945 int ret = 0;
946
947 ret = clk_enable(xqspi->pclk);
948 if (ret) {
949 dev_err(dev, "Cannot enable APB clock.\n");
950 return ret;
951 }
952
953 ret = clk_enable(xqspi->refclk);
954 if (ret) {
955 dev_err(dev, "Cannot enable device clock.\n");
956 clk_disable(xqspi->pclk);
957 return ret;
958 }
959
960 spi_master_resume(master);
961
962 return 0;
963}
964
965static SIMPLE_DEV_PM_OPS(zynqmp_qspi_dev_pm_ops, zynqmp_qspi_suspend,
966 zynqmp_qspi_resume);
967
968/**
969 * zynqmp_qspi_probe: Probe method for the QSPI driver
970 * @pdev: Pointer to the platform_device structure
971 *
972 * This function initializes the driver data structures and the hardware.
973 *
974 * Return: 0 on success; error value otherwise
975 */
976static int zynqmp_qspi_probe(struct platform_device *pdev)
977{
978 int ret = 0;
979 struct spi_master *master;
980 struct zynqmp_qspi *xqspi;
981 struct resource *res;
982 struct device *dev = &pdev->dev;
983
984 master = spi_alloc_master(&pdev->dev, sizeof(*xqspi));
985 if (!master)
986 return -ENOMEM;
987
988 xqspi = spi_master_get_devdata(master);
989 master->dev.of_node = pdev->dev.of_node;
990 platform_set_drvdata(pdev, master);
991
992 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
993 xqspi->regs = devm_ioremap_resource(&pdev->dev, res);
994 if (IS_ERR(xqspi->regs)) {
995 ret = PTR_ERR(xqspi->regs);
996 goto remove_master;
997 }
998
999 xqspi->dev = dev;
1000 xqspi->pclk = devm_clk_get(&pdev->dev, "pclk");
1001 if (IS_ERR(xqspi->pclk)) {
1002 dev_err(dev, "pclk clock not found.\n");
1003 ret = PTR_ERR(xqspi->pclk);
1004 goto remove_master;
1005 }
1006
1007 ret = clk_prepare_enable(xqspi->pclk);
1008 if (ret) {
1009 dev_err(dev, "Unable to enable APB clock.\n");
1010 goto remove_master;
1011 }
1012
1013 xqspi->refclk = devm_clk_get(&pdev->dev, "ref_clk");
1014 if (IS_ERR(xqspi->refclk)) {
1015 dev_err(dev, "ref_clk clock not found.\n");
1016 ret = PTR_ERR(xqspi->refclk);
1017 goto clk_dis_pclk;
1018 }
1019
1020 ret = clk_prepare_enable(xqspi->refclk);
1021 if (ret) {
1022 dev_err(dev, "Unable to enable device clock.\n");
1023 goto clk_dis_pclk;
1024 }
1025
1026 /* QSPI controller initializations */
1027 zynqmp_qspi_init_hw(xqspi);
1028
1029 xqspi->irq = platform_get_irq(pdev, 0);
1030 if (xqspi->irq <= 0) {
1031 ret = -ENXIO;
1032 dev_err(dev, "irq resource not found\n");
1033 goto clk_dis_all;
1034 }
1035 ret = devm_request_irq(&pdev->dev, xqspi->irq, zynqmp_qspi_irq,
1036 0, pdev->name, master);
1037 if (ret != 0) {
1038 ret = -ENXIO;
1039 dev_err(dev, "request_irq failed\n");
1040 goto clk_dis_all;
1041 }
1042
1043 master->num_chipselect = GQSPI_DEFAULT_NUM_CS;
1044
1045 master->setup = zynqmp_qspi_setup;
1046 master->set_cs = zynqmp_qspi_chipselect;
1047 master->transfer_one = zynqmp_qspi_start_transfer;
1048 master->prepare_transfer_hardware = zynqmp_prepare_transfer_hardware;
1049 master->unprepare_transfer_hardware =
1050 zynqmp_unprepare_transfer_hardware;
1051 master->max_speed_hz = clk_get_rate(xqspi->refclk) / 2;
1052 master->bits_per_word_mask = SPI_BPW_MASK(8);
1053 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
1054 SPI_TX_DUAL | SPI_TX_QUAD;
1055
1056 if (master->dev.parent == NULL)
1057 master->dev.parent = &master->dev;
1058
1059 ret = spi_register_master(master);
1060 if (ret)
1061 goto clk_dis_all;
1062
1063 return 0;
1064
1065clk_dis_all:
1066 clk_disable_unprepare(xqspi->refclk);
1067clk_dis_pclk:
1068 clk_disable_unprepare(xqspi->pclk);
1069remove_master:
1070 spi_master_put(master);
1071
1072 return ret;
1073}
1074
1075/**
1076 * zynqmp_qspi_remove: Remove method for the QSPI driver
1077 * @pdev: Pointer to the platform_device structure
1078 *
1079 * This function is called if a device is physically removed from the system or
1080 * if the driver module is being unloaded. It frees all resources allocated to
1081 * the device.
1082 *
1083 * Return: 0 Always
1084 */
1085static int zynqmp_qspi_remove(struct platform_device *pdev)
1086{
1087 struct spi_master *master = platform_get_drvdata(pdev);
1088 struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
1089
1090 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
1091 clk_disable_unprepare(xqspi->refclk);
1092 clk_disable_unprepare(xqspi->pclk);
1093
1094 spi_unregister_master(master);
1095
1096 return 0;
1097}
1098
1099static const struct of_device_id zynqmp_qspi_of_match[] = {
1100 { .compatible = "xlnx,zynqmp-qspi-1.0", },
1101 { /* End of table */ }
1102};
1103
1104MODULE_DEVICE_TABLE(of, zynqmp_qspi_of_match);
1105
1106static struct platform_driver zynqmp_qspi_driver = {
1107 .probe = zynqmp_qspi_probe,
1108 .remove = zynqmp_qspi_remove,
1109 .driver = {
1110 .name = "zynqmp-qspi",
1111 .of_match_table = zynqmp_qspi_of_match,
1112 .pm = &zynqmp_qspi_dev_pm_ops,
1113 },
1114};
1115
1116module_platform_driver(zynqmp_qspi_driver);
1117
1118MODULE_AUTHOR("Xilinx, Inc.");
1119MODULE_DESCRIPTION("Xilinx Zynqmp QSPI driver");
1120MODULE_LICENSE("GPL");
Empty description
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