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69c202af AP |
1 | /* |
2 | * drivers/spi/spi_imx.c | |
3 | * | |
4 | * Copyright (C) 2006 SWAPP | |
5 | * Andrea Paterniani <a.paterniani@swapp-eng.it> | |
6 | * | |
7 | * Initial version inspired by: | |
8 | * linux-2.6.17-rc3-mm1/drivers/spi/pxa2xx_spi.c | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | */ | |
20 | ||
21 | #include <linux/init.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/ioport.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/platform_device.h> | |
28 | #include <linux/dma-mapping.h> | |
29 | #include <linux/spi/spi.h> | |
30 | #include <linux/workqueue.h> | |
31 | #include <linux/delay.h> | |
32 | ||
33 | #include <asm/io.h> | |
34 | #include <asm/irq.h> | |
35 | #include <asm/hardware.h> | |
36 | #include <asm/delay.h> | |
37 | ||
38 | #include <asm/arch/hardware.h> | |
39 | #include <asm/arch/imx-dma.h> | |
40 | #include <asm/arch/spi_imx.h> | |
41 | ||
42 | /*-------------------------------------------------------------------------*/ | |
43 | /* SPI Registers offsets from peripheral base address */ | |
44 | #define SPI_RXDATA (0x00) | |
45 | #define SPI_TXDATA (0x04) | |
46 | #define SPI_CONTROL (0x08) | |
47 | #define SPI_INT_STATUS (0x0C) | |
48 | #define SPI_TEST (0x10) | |
49 | #define SPI_PERIOD (0x14) | |
50 | #define SPI_DMA (0x18) | |
51 | #define SPI_RESET (0x1C) | |
52 | ||
53 | /* SPI Control Register Bit Fields & Masks */ | |
54 | #define SPI_CONTROL_BITCOUNT_MASK (0xF) /* Bit Count Mask */ | |
55 | #define SPI_CONTROL_BITCOUNT(n) (((n) - 1) & SPI_CONTROL_BITCOUNT_MASK) | |
56 | #define SPI_CONTROL_POL (0x1 << 4) /* Clock Polarity Mask */ | |
57 | #define SPI_CONTROL_POL_ACT_HIGH (0x0 << 4) /* Active high pol. (0=idle) */ | |
58 | #define SPI_CONTROL_POL_ACT_LOW (0x1 << 4) /* Active low pol. (1=idle) */ | |
59 | #define SPI_CONTROL_PHA (0x1 << 5) /* Clock Phase Mask */ | |
60 | #define SPI_CONTROL_PHA_0 (0x0 << 5) /* Clock Phase 0 */ | |
61 | #define SPI_CONTROL_PHA_1 (0x1 << 5) /* Clock Phase 1 */ | |
62 | #define SPI_CONTROL_SSCTL (0x1 << 6) /* /SS Waveform Select Mask */ | |
63 | #define SPI_CONTROL_SSCTL_0 (0x0 << 6) /* Master: /SS stays low between SPI burst | |
64 | Slave: RXFIFO advanced by BIT_COUNT */ | |
65 | #define SPI_CONTROL_SSCTL_1 (0x1 << 6) /* Master: /SS insert pulse between SPI burst | |
66 | Slave: RXFIFO advanced by /SS rising edge */ | |
67 | #define SPI_CONTROL_SSPOL (0x1 << 7) /* /SS Polarity Select Mask */ | |
68 | #define SPI_CONTROL_SSPOL_ACT_LOW (0x0 << 7) /* /SS Active low */ | |
69 | #define SPI_CONTROL_SSPOL_ACT_HIGH (0x1 << 7) /* /SS Active high */ | |
70 | #define SPI_CONTROL_XCH (0x1 << 8) /* Exchange */ | |
71 | #define SPI_CONTROL_SPIEN (0x1 << 9) /* SPI Module Enable */ | |
72 | #define SPI_CONTROL_MODE (0x1 << 10) /* SPI Mode Select Mask */ | |
73 | #define SPI_CONTROL_MODE_SLAVE (0x0 << 10) /* SPI Mode Slave */ | |
74 | #define SPI_CONTROL_MODE_MASTER (0x1 << 10) /* SPI Mode Master */ | |
75 | #define SPI_CONTROL_DRCTL (0x3 << 11) /* /SPI_RDY Control Mask */ | |
76 | #define SPI_CONTROL_DRCTL_0 (0x0 << 11) /* Ignore /SPI_RDY */ | |
77 | #define SPI_CONTROL_DRCTL_1 (0x1 << 11) /* /SPI_RDY falling edge triggers input */ | |
78 | #define SPI_CONTROL_DRCTL_2 (0x2 << 11) /* /SPI_RDY active low level triggers input */ | |
79 | #define SPI_CONTROL_DATARATE (0x7 << 13) /* Data Rate Mask */ | |
80 | #define SPI_PERCLK2_DIV_MIN (0) /* PERCLK2:4 */ | |
81 | #define SPI_PERCLK2_DIV_MAX (7) /* PERCLK2:512 */ | |
82 | #define SPI_CONTROL_DATARATE_MIN (SPI_PERCLK2_DIV_MAX << 13) | |
83 | #define SPI_CONTROL_DATARATE_MAX (SPI_PERCLK2_DIV_MIN << 13) | |
84 | #define SPI_CONTROL_DATARATE_BAD (SPI_CONTROL_DATARATE_MIN + 1) | |
85 | ||
86 | /* SPI Interrupt/Status Register Bit Fields & Masks */ | |
87 | #define SPI_STATUS_TE (0x1 << 0) /* TXFIFO Empty Status */ | |
88 | #define SPI_STATUS_TH (0x1 << 1) /* TXFIFO Half Status */ | |
89 | #define SPI_STATUS_TF (0x1 << 2) /* TXFIFO Full Status */ | |
90 | #define SPI_STATUS_RR (0x1 << 3) /* RXFIFO Data Ready Status */ | |
91 | #define SPI_STATUS_RH (0x1 << 4) /* RXFIFO Half Status */ | |
92 | #define SPI_STATUS_RF (0x1 << 5) /* RXFIFO Full Status */ | |
93 | #define SPI_STATUS_RO (0x1 << 6) /* RXFIFO Overflow */ | |
94 | #define SPI_STATUS_BO (0x1 << 7) /* Bit Count Overflow */ | |
95 | #define SPI_STATUS (0xFF) /* SPI Status Mask */ | |
96 | #define SPI_INTEN_TE (0x1 << 8) /* TXFIFO Empty Interrupt Enable */ | |
97 | #define SPI_INTEN_TH (0x1 << 9) /* TXFIFO Half Interrupt Enable */ | |
98 | #define SPI_INTEN_TF (0x1 << 10) /* TXFIFO Full Interrupt Enable */ | |
99 | #define SPI_INTEN_RE (0x1 << 11) /* RXFIFO Data Ready Interrupt Enable */ | |
100 | #define SPI_INTEN_RH (0x1 << 12) /* RXFIFO Half Interrupt Enable */ | |
101 | #define SPI_INTEN_RF (0x1 << 13) /* RXFIFO Full Interrupt Enable */ | |
102 | #define SPI_INTEN_RO (0x1 << 14) /* RXFIFO Overflow Interrupt Enable */ | |
103 | #define SPI_INTEN_BO (0x1 << 15) /* Bit Count Overflow Interrupt Enable */ | |
104 | #define SPI_INTEN (0xFF << 8) /* SPI Interrupt Enable Mask */ | |
105 | ||
106 | /* SPI Test Register Bit Fields & Masks */ | |
107 | #define SPI_TEST_TXCNT (0xF << 0) /* TXFIFO Counter */ | |
108 | #define SPI_TEST_RXCNT_LSB (4) /* RXFIFO Counter LSB */ | |
109 | #define SPI_TEST_RXCNT (0xF << 4) /* RXFIFO Counter */ | |
110 | #define SPI_TEST_SSTATUS (0xF << 8) /* State Machine Status */ | |
111 | #define SPI_TEST_LBC (0x1 << 14) /* Loop Back Control */ | |
112 | ||
113 | /* SPI Period Register Bit Fields & Masks */ | |
114 | #define SPI_PERIOD_WAIT (0x7FFF << 0) /* Wait Between Transactions */ | |
115 | #define SPI_PERIOD_MAX_WAIT (0x7FFF) /* Max Wait Between | |
116 | Transactions */ | |
117 | #define SPI_PERIOD_CSRC (0x1 << 15) /* Period Clock Source Mask */ | |
118 | #define SPI_PERIOD_CSRC_BCLK (0x0 << 15) /* Period Clock Source is | |
119 | Bit Clock */ | |
120 | #define SPI_PERIOD_CSRC_32768 (0x1 << 15) /* Period Clock Source is | |
121 | 32.768 KHz Clock */ | |
122 | ||
123 | /* SPI DMA Register Bit Fields & Masks */ | |
ac140a8f | 124 | #define SPI_DMA_RHDMA (0x1 << 4) /* RXFIFO Half Status */ |
69c202af AP |
125 | #define SPI_DMA_RFDMA (0x1 << 5) /* RXFIFO Full Status */ |
126 | #define SPI_DMA_TEDMA (0x1 << 6) /* TXFIFO Empty Status */ | |
127 | #define SPI_DMA_THDMA (0x1 << 7) /* TXFIFO Half Status */ | |
128 | #define SPI_DMA_RHDEN (0x1 << 12) /* RXFIFO Half DMA Request Enable */ | |
129 | #define SPI_DMA_RFDEN (0x1 << 13) /* RXFIFO Full DMA Request Enable */ | |
130 | #define SPI_DMA_TEDEN (0x1 << 14) /* TXFIFO Empty DMA Request Enable */ | |
131 | #define SPI_DMA_THDEN (0x1 << 15) /* TXFIFO Half DMA Request Enable */ | |
132 | ||
133 | /* SPI Soft Reset Register Bit Fields & Masks */ | |
134 | #define SPI_RESET_START (0x1) /* Start */ | |
135 | ||
136 | /* Default SPI configuration values */ | |
137 | #define SPI_DEFAULT_CONTROL \ | |
138 | ( \ | |
139 | SPI_CONTROL_BITCOUNT(16) | \ | |
140 | SPI_CONTROL_POL_ACT_HIGH | \ | |
141 | SPI_CONTROL_PHA_0 | \ | |
142 | SPI_CONTROL_SPIEN | \ | |
143 | SPI_CONTROL_SSCTL_1 | \ | |
144 | SPI_CONTROL_MODE_MASTER | \ | |
145 | SPI_CONTROL_DRCTL_0 | \ | |
146 | SPI_CONTROL_DATARATE_MIN \ | |
147 | ) | |
148 | #define SPI_DEFAULT_ENABLE_LOOPBACK (0) | |
149 | #define SPI_DEFAULT_ENABLE_DMA (0) | |
150 | #define SPI_DEFAULT_PERIOD_WAIT (8) | |
151 | /*-------------------------------------------------------------------------*/ | |
152 | ||
153 | ||
154 | /*-------------------------------------------------------------------------*/ | |
155 | /* TX/RX SPI FIFO size */ | |
156 | #define SPI_FIFO_DEPTH (8) | |
157 | #define SPI_FIFO_BYTE_WIDTH (2) | |
158 | #define SPI_FIFO_OVERFLOW_MARGIN (2) | |
159 | ||
160 | /* DMA burst lenght for half full/empty request trigger */ | |
161 | #define SPI_DMA_BLR (SPI_FIFO_DEPTH * SPI_FIFO_BYTE_WIDTH / 2) | |
162 | ||
163 | /* Dummy char output to achieve reads. | |
164 | Choosing something different from all zeroes may help pattern recogition | |
165 | for oscilloscope analysis, but may break some drivers. */ | |
166 | #define SPI_DUMMY_u8 0 | |
167 | #define SPI_DUMMY_u16 ((SPI_DUMMY_u8 << 8) | SPI_DUMMY_u8) | |
168 | #define SPI_DUMMY_u32 ((SPI_DUMMY_u16 << 16) | SPI_DUMMY_u16) | |
169 | ||
170 | /** | |
171 | * Macro to change a u32 field: | |
172 | * @r : register to edit | |
173 | * @m : bit mask | |
174 | * @v : new value for the field correctly bit-alligned | |
175 | */ | |
176 | #define u32_EDIT(r, m, v) r = (r & ~(m)) | (v) | |
177 | ||
178 | /* Message state */ | |
179 | #define START_STATE ((void*)0) | |
180 | #define RUNNING_STATE ((void*)1) | |
181 | #define DONE_STATE ((void*)2) | |
182 | #define ERROR_STATE ((void*)-1) | |
183 | ||
184 | /* Queue state */ | |
185 | #define QUEUE_RUNNING (0) | |
186 | #define QUEUE_STOPPED (1) | |
187 | ||
188 | #define IS_DMA_ALIGNED(x) (((u32)(x) & 0x03) == 0) | |
189 | /*-------------------------------------------------------------------------*/ | |
190 | ||
191 | ||
192 | /*-------------------------------------------------------------------------*/ | |
193 | /* Driver data structs */ | |
194 | ||
195 | /* Context */ | |
196 | struct driver_data { | |
197 | /* Driver model hookup */ | |
198 | struct platform_device *pdev; | |
199 | ||
200 | /* SPI framework hookup */ | |
201 | struct spi_master *master; | |
202 | ||
203 | /* IMX hookup */ | |
204 | struct spi_imx_master *master_info; | |
205 | ||
206 | /* Memory resources and SPI regs virtual address */ | |
207 | struct resource *ioarea; | |
208 | void __iomem *regs; | |
209 | ||
210 | /* SPI RX_DATA physical address */ | |
211 | dma_addr_t rd_data_phys; | |
212 | ||
213 | /* Driver message queue */ | |
214 | struct workqueue_struct *workqueue; | |
215 | struct work_struct work; | |
216 | spinlock_t lock; | |
217 | struct list_head queue; | |
218 | int busy; | |
219 | int run; | |
220 | ||
221 | /* Message Transfer pump */ | |
222 | struct tasklet_struct pump_transfers; | |
223 | ||
224 | /* Current message, transfer and state */ | |
225 | struct spi_message *cur_msg; | |
226 | struct spi_transfer *cur_transfer; | |
227 | struct chip_data *cur_chip; | |
228 | ||
229 | /* Rd / Wr buffers pointers */ | |
230 | size_t len; | |
231 | void *tx; | |
232 | void *tx_end; | |
233 | void *rx; | |
234 | void *rx_end; | |
235 | ||
236 | u8 rd_only; | |
237 | u8 n_bytes; | |
238 | int cs_change; | |
239 | ||
240 | /* Function pointers */ | |
241 | irqreturn_t (*transfer_handler)(struct driver_data *drv_data); | |
242 | void (*cs_control)(u32 command); | |
243 | ||
244 | /* DMA setup */ | |
245 | int rx_channel; | |
246 | int tx_channel; | |
247 | dma_addr_t rx_dma; | |
248 | dma_addr_t tx_dma; | |
249 | int rx_dma_needs_unmap; | |
250 | int tx_dma_needs_unmap; | |
251 | size_t tx_map_len; | |
252 | u32 dummy_dma_buf ____cacheline_aligned; | |
253 | }; | |
254 | ||
255 | /* Runtime state */ | |
256 | struct chip_data { | |
257 | u32 control; | |
258 | u32 period; | |
259 | u32 test; | |
260 | ||
261 | u8 enable_dma:1; | |
262 | u8 bits_per_word; | |
263 | u8 n_bytes; | |
264 | u32 max_speed_hz; | |
265 | ||
266 | void (*cs_control)(u32 command); | |
267 | }; | |
268 | /*-------------------------------------------------------------------------*/ | |
269 | ||
270 | ||
271 | static void pump_messages(struct work_struct *work); | |
272 | ||
273 | static int flush(struct driver_data *drv_data) | |
274 | { | |
275 | unsigned long limit = loops_per_jiffy << 1; | |
276 | void __iomem *regs = drv_data->regs; | |
277 | volatile u32 d; | |
278 | ||
279 | dev_dbg(&drv_data->pdev->dev, "flush\n"); | |
280 | do { | |
281 | while (readl(regs + SPI_INT_STATUS) & SPI_STATUS_RR) | |
282 | d = readl(regs + SPI_RXDATA); | |
283 | } while ((readl(regs + SPI_CONTROL) & SPI_CONTROL_XCH) && limit--); | |
284 | ||
285 | return limit; | |
286 | } | |
287 | ||
288 | static void restore_state(struct driver_data *drv_data) | |
289 | { | |
290 | void __iomem *regs = drv_data->regs; | |
291 | struct chip_data *chip = drv_data->cur_chip; | |
292 | ||
293 | /* Load chip registers */ | |
294 | dev_dbg(&drv_data->pdev->dev, | |
295 | "restore_state\n" | |
296 | " test = 0x%08X\n" | |
297 | " control = 0x%08X\n", | |
298 | chip->test, | |
299 | chip->control); | |
300 | writel(chip->test, regs + SPI_TEST); | |
301 | writel(chip->period, regs + SPI_PERIOD); | |
302 | writel(0, regs + SPI_INT_STATUS); | |
303 | writel(chip->control, regs + SPI_CONTROL); | |
304 | } | |
305 | ||
306 | static void null_cs_control(u32 command) | |
307 | { | |
308 | } | |
309 | ||
310 | static inline u32 data_to_write(struct driver_data *drv_data) | |
311 | { | |
312 | return ((u32)(drv_data->tx_end - drv_data->tx)) / drv_data->n_bytes; | |
313 | } | |
314 | ||
315 | static inline u32 data_to_read(struct driver_data *drv_data) | |
316 | { | |
317 | return ((u32)(drv_data->rx_end - drv_data->rx)) / drv_data->n_bytes; | |
318 | } | |
319 | ||
320 | static int write(struct driver_data *drv_data) | |
321 | { | |
322 | void __iomem *regs = drv_data->regs; | |
323 | void *tx = drv_data->tx; | |
324 | void *tx_end = drv_data->tx_end; | |
325 | u8 n_bytes = drv_data->n_bytes; | |
326 | u32 remaining_writes; | |
327 | u32 fifo_avail_space; | |
328 | u32 n; | |
329 | u16 d; | |
330 | ||
331 | /* Compute how many fifo writes to do */ | |
332 | remaining_writes = (u32)(tx_end - tx) / n_bytes; | |
333 | fifo_avail_space = SPI_FIFO_DEPTH - | |
334 | (readl(regs + SPI_TEST) & SPI_TEST_TXCNT); | |
335 | if (drv_data->rx && (fifo_avail_space > SPI_FIFO_OVERFLOW_MARGIN)) | |
336 | /* Fix misunderstood receive overflow */ | |
337 | fifo_avail_space -= SPI_FIFO_OVERFLOW_MARGIN; | |
338 | n = min(remaining_writes, fifo_avail_space); | |
339 | ||
340 | dev_dbg(&drv_data->pdev->dev, | |
341 | "write type %s\n" | |
342 | " remaining writes = %d\n" | |
343 | " fifo avail space = %d\n" | |
344 | " fifo writes = %d\n", | |
345 | (n_bytes == 1) ? "u8" : "u16", | |
346 | remaining_writes, | |
347 | fifo_avail_space, | |
348 | n); | |
349 | ||
350 | if (n > 0) { | |
351 | /* Fill SPI TXFIFO */ | |
352 | if (drv_data->rd_only) { | |
353 | tx += n * n_bytes; | |
354 | while (n--) | |
355 | writel(SPI_DUMMY_u16, regs + SPI_TXDATA); | |
356 | } else { | |
357 | if (n_bytes == 1) { | |
358 | while (n--) { | |
359 | d = *(u8*)tx; | |
360 | writel(d, regs + SPI_TXDATA); | |
361 | tx += 1; | |
362 | } | |
363 | } else { | |
364 | while (n--) { | |
365 | d = *(u16*)tx; | |
366 | writel(d, regs + SPI_TXDATA); | |
367 | tx += 2; | |
368 | } | |
369 | } | |
370 | } | |
371 | ||
372 | /* Trigger transfer */ | |
373 | writel(readl(regs + SPI_CONTROL) | SPI_CONTROL_XCH, | |
374 | regs + SPI_CONTROL); | |
375 | ||
376 | /* Update tx pointer */ | |
377 | drv_data->tx = tx; | |
378 | } | |
379 | ||
380 | return (tx >= tx_end); | |
381 | } | |
382 | ||
383 | static int read(struct driver_data *drv_data) | |
384 | { | |
385 | void __iomem *regs = drv_data->regs; | |
386 | void *rx = drv_data->rx; | |
387 | void *rx_end = drv_data->rx_end; | |
388 | u8 n_bytes = drv_data->n_bytes; | |
389 | u32 remaining_reads; | |
390 | u32 fifo_rxcnt; | |
391 | u32 n; | |
392 | u16 d; | |
393 | ||
394 | /* Compute how many fifo reads to do */ | |
395 | remaining_reads = (u32)(rx_end - rx) / n_bytes; | |
396 | fifo_rxcnt = (readl(regs + SPI_TEST) & SPI_TEST_RXCNT) >> | |
397 | SPI_TEST_RXCNT_LSB; | |
398 | n = min(remaining_reads, fifo_rxcnt); | |
399 | ||
400 | dev_dbg(&drv_data->pdev->dev, | |
401 | "read type %s\n" | |
402 | " remaining reads = %d\n" | |
403 | " fifo rx count = %d\n" | |
404 | " fifo reads = %d\n", | |
405 | (n_bytes == 1) ? "u8" : "u16", | |
406 | remaining_reads, | |
407 | fifo_rxcnt, | |
408 | n); | |
409 | ||
410 | if (n > 0) { | |
411 | /* Read SPI RXFIFO */ | |
412 | if (n_bytes == 1) { | |
413 | while (n--) { | |
414 | d = readl(regs + SPI_RXDATA); | |
415 | *((u8*)rx) = d; | |
416 | rx += 1; | |
417 | } | |
418 | } else { | |
419 | while (n--) { | |
420 | d = readl(regs + SPI_RXDATA); | |
421 | *((u16*)rx) = d; | |
422 | rx += 2; | |
423 | } | |
424 | } | |
425 | ||
426 | /* Update rx pointer */ | |
427 | drv_data->rx = rx; | |
428 | } | |
429 | ||
430 | return (rx >= rx_end); | |
431 | } | |
432 | ||
433 | static void *next_transfer(struct driver_data *drv_data) | |
434 | { | |
435 | struct spi_message *msg = drv_data->cur_msg; | |
436 | struct spi_transfer *trans = drv_data->cur_transfer; | |
437 | ||
438 | /* Move to next transfer */ | |
439 | if (trans->transfer_list.next != &msg->transfers) { | |
440 | drv_data->cur_transfer = | |
441 | list_entry(trans->transfer_list.next, | |
442 | struct spi_transfer, | |
443 | transfer_list); | |
444 | return RUNNING_STATE; | |
445 | } | |
446 | ||
447 | return DONE_STATE; | |
448 | } | |
449 | ||
450 | static int map_dma_buffers(struct driver_data *drv_data) | |
451 | { | |
452 | struct spi_message *msg; | |
453 | struct device *dev; | |
454 | void *buf; | |
455 | ||
456 | drv_data->rx_dma_needs_unmap = 0; | |
457 | drv_data->tx_dma_needs_unmap = 0; | |
458 | ||
459 | if (!drv_data->master_info->enable_dma || | |
460 | !drv_data->cur_chip->enable_dma) | |
461 | return -1; | |
462 | ||
463 | msg = drv_data->cur_msg; | |
464 | dev = &msg->spi->dev; | |
465 | if (msg->is_dma_mapped) { | |
466 | if (drv_data->tx_dma) | |
467 | /* The caller provided at least dma and cpu virtual | |
468 | address for write; pump_transfers() will consider the | |
469 | transfer as write only if cpu rx virtual address is | |
470 | NULL */ | |
471 | return 0; | |
472 | ||
473 | if (drv_data->rx_dma) { | |
474 | /* The caller provided dma and cpu virtual address to | |
475 | performe read only transfer --> | |
476 | use drv_data->dummy_dma_buf for dummy writes to | |
477 | achive reads */ | |
478 | buf = &drv_data->dummy_dma_buf; | |
479 | drv_data->tx_map_len = sizeof(drv_data->dummy_dma_buf); | |
480 | drv_data->tx_dma = dma_map_single(dev, | |
481 | buf, | |
482 | drv_data->tx_map_len, | |
483 | DMA_TO_DEVICE); | |
484 | if (dma_mapping_error(drv_data->tx_dma)) | |
485 | return -1; | |
486 | ||
487 | drv_data->tx_dma_needs_unmap = 1; | |
488 | ||
489 | /* Flags transfer as rd_only for pump_transfers() DMA | |
490 | regs programming (should be redundant) */ | |
491 | drv_data->tx = NULL; | |
492 | ||
493 | return 0; | |
494 | } | |
495 | } | |
496 | ||
497 | if (!IS_DMA_ALIGNED(drv_data->rx) || !IS_DMA_ALIGNED(drv_data->tx)) | |
498 | return -1; | |
499 | ||
500 | /* NULL rx means write-only transfer and no map needed | |
501 | since rx DMA will not be used */ | |
502 | if (drv_data->rx) { | |
503 | buf = drv_data->rx; | |
504 | drv_data->rx_dma = dma_map_single( | |
505 | dev, | |
506 | buf, | |
507 | drv_data->len, | |
508 | DMA_FROM_DEVICE); | |
509 | if (dma_mapping_error(drv_data->rx_dma)) | |
510 | return -1; | |
511 | drv_data->rx_dma_needs_unmap = 1; | |
512 | } | |
513 | ||
514 | if (drv_data->tx == NULL) { | |
515 | /* Read only message --> use drv_data->dummy_dma_buf for dummy | |
516 | writes to achive reads */ | |
517 | buf = &drv_data->dummy_dma_buf; | |
518 | drv_data->tx_map_len = sizeof(drv_data->dummy_dma_buf); | |
519 | } else { | |
520 | buf = drv_data->tx; | |
521 | drv_data->tx_map_len = drv_data->len; | |
522 | } | |
523 | drv_data->tx_dma = dma_map_single(dev, | |
524 | buf, | |
525 | drv_data->tx_map_len, | |
526 | DMA_TO_DEVICE); | |
527 | if (dma_mapping_error(drv_data->tx_dma)) { | |
528 | if (drv_data->rx_dma) { | |
529 | dma_unmap_single(dev, | |
530 | drv_data->rx_dma, | |
531 | drv_data->len, | |
532 | DMA_FROM_DEVICE); | |
533 | drv_data->rx_dma_needs_unmap = 0; | |
534 | } | |
535 | return -1; | |
536 | } | |
537 | drv_data->tx_dma_needs_unmap = 1; | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | static void unmap_dma_buffers(struct driver_data *drv_data) | |
543 | { | |
544 | struct spi_message *msg = drv_data->cur_msg; | |
545 | struct device *dev = &msg->spi->dev; | |
546 | ||
547 | if (drv_data->rx_dma_needs_unmap) { | |
548 | dma_unmap_single(dev, | |
549 | drv_data->rx_dma, | |
550 | drv_data->len, | |
551 | DMA_FROM_DEVICE); | |
552 | drv_data->rx_dma_needs_unmap = 0; | |
553 | } | |
554 | if (drv_data->tx_dma_needs_unmap) { | |
555 | dma_unmap_single(dev, | |
556 | drv_data->tx_dma, | |
557 | drv_data->tx_map_len, | |
558 | DMA_TO_DEVICE); | |
559 | drv_data->tx_dma_needs_unmap = 0; | |
560 | } | |
561 | } | |
562 | ||
563 | /* Caller already set message->status (dma is already blocked) */ | |
564 | static void giveback(struct spi_message *message, struct driver_data *drv_data) | |
565 | { | |
566 | void __iomem *regs = drv_data->regs; | |
567 | ||
568 | /* Bring SPI to sleep; restore_state() and pump_transfer() | |
569 | will do new setup */ | |
570 | writel(0, regs + SPI_INT_STATUS); | |
571 | writel(0, regs + SPI_DMA); | |
572 | ||
573 | drv_data->cs_control(SPI_CS_DEASSERT); | |
574 | ||
575 | message->state = NULL; | |
576 | if (message->complete) | |
577 | message->complete(message->context); | |
578 | ||
579 | drv_data->cur_msg = NULL; | |
580 | drv_data->cur_transfer = NULL; | |
581 | drv_data->cur_chip = NULL; | |
582 | queue_work(drv_data->workqueue, &drv_data->work); | |
583 | } | |
584 | ||
585 | static void dma_err_handler(int channel, void *data, int errcode) | |
586 | { | |
587 | struct driver_data *drv_data = data; | |
588 | struct spi_message *msg = drv_data->cur_msg; | |
589 | ||
590 | dev_dbg(&drv_data->pdev->dev, "dma_err_handler\n"); | |
591 | ||
592 | /* Disable both rx and tx dma channels */ | |
593 | imx_dma_disable(drv_data->rx_channel); | |
594 | imx_dma_disable(drv_data->tx_channel); | |
595 | ||
596 | if (flush(drv_data) == 0) | |
597 | dev_err(&drv_data->pdev->dev, | |
598 | "dma_err_handler - flush failed\n"); | |
599 | ||
600 | unmap_dma_buffers(drv_data); | |
601 | ||
602 | msg->state = ERROR_STATE; | |
603 | tasklet_schedule(&drv_data->pump_transfers); | |
604 | } | |
605 | ||
606 | static void dma_tx_handler(int channel, void *data) | |
607 | { | |
608 | struct driver_data *drv_data = data; | |
609 | ||
610 | dev_dbg(&drv_data->pdev->dev, "dma_tx_handler\n"); | |
611 | ||
612 | imx_dma_disable(channel); | |
613 | ||
614 | /* Now waits for TX FIFO empty */ | |
615 | writel(readl(drv_data->regs + SPI_INT_STATUS) | SPI_INTEN_TE, | |
616 | drv_data->regs + SPI_INT_STATUS); | |
617 | } | |
618 | ||
619 | static irqreturn_t dma_transfer(struct driver_data *drv_data) | |
620 | { | |
621 | u32 status; | |
622 | struct spi_message *msg = drv_data->cur_msg; | |
623 | void __iomem *regs = drv_data->regs; | |
624 | unsigned long limit; | |
625 | ||
626 | status = readl(regs + SPI_INT_STATUS); | |
627 | ||
628 | if ((status & SPI_INTEN_RO) && (status & SPI_STATUS_RO)) { | |
629 | writel(status & ~SPI_INTEN, regs + SPI_INT_STATUS); | |
630 | ||
631 | imx_dma_disable(drv_data->rx_channel); | |
632 | unmap_dma_buffers(drv_data); | |
633 | ||
634 | if (flush(drv_data) == 0) | |
635 | dev_err(&drv_data->pdev->dev, | |
636 | "dma_transfer - flush failed\n"); | |
637 | ||
638 | dev_warn(&drv_data->pdev->dev, | |
639 | "dma_transfer - fifo overun\n"); | |
640 | ||
641 | msg->state = ERROR_STATE; | |
642 | tasklet_schedule(&drv_data->pump_transfers); | |
643 | ||
644 | return IRQ_HANDLED; | |
645 | } | |
646 | ||
647 | if (status & SPI_STATUS_TE) { | |
648 | writel(status & ~SPI_INTEN_TE, regs + SPI_INT_STATUS); | |
649 | ||
650 | if (drv_data->rx) { | |
651 | /* Wait end of transfer before read trailing data */ | |
652 | limit = loops_per_jiffy << 1; | |
653 | while ((readl(regs + SPI_CONTROL) & SPI_CONTROL_XCH) && | |
654 | limit--); | |
655 | ||
656 | if (limit == 0) | |
657 | dev_err(&drv_data->pdev->dev, | |
658 | "dma_transfer - end of tx failed\n"); | |
659 | else | |
660 | dev_dbg(&drv_data->pdev->dev, | |
661 | "dma_transfer - end of tx\n"); | |
662 | ||
663 | imx_dma_disable(drv_data->rx_channel); | |
664 | unmap_dma_buffers(drv_data); | |
665 | ||
666 | /* Calculate number of trailing data and read them */ | |
667 | dev_dbg(&drv_data->pdev->dev, | |
668 | "dma_transfer - test = 0x%08X\n", | |
669 | readl(regs + SPI_TEST)); | |
670 | drv_data->rx = drv_data->rx_end - | |
671 | ((readl(regs + SPI_TEST) & | |
672 | SPI_TEST_RXCNT) >> | |
673 | SPI_TEST_RXCNT_LSB)*drv_data->n_bytes; | |
674 | read(drv_data); | |
675 | } else { | |
676 | /* Write only transfer */ | |
677 | unmap_dma_buffers(drv_data); | |
678 | ||
679 | if (flush(drv_data) == 0) | |
680 | dev_err(&drv_data->pdev->dev, | |
681 | "dma_transfer - flush failed\n"); | |
682 | } | |
683 | ||
684 | /* End of transfer, update total byte transfered */ | |
685 | msg->actual_length += drv_data->len; | |
686 | ||
687 | /* Release chip select if requested, transfer delays are | |
688 | handled in pump_transfers() */ | |
689 | if (drv_data->cs_change) | |
690 | drv_data->cs_control(SPI_CS_DEASSERT); | |
691 | ||
692 | /* Move to next transfer */ | |
693 | msg->state = next_transfer(drv_data); | |
694 | ||
695 | /* Schedule transfer tasklet */ | |
696 | tasklet_schedule(&drv_data->pump_transfers); | |
697 | ||
698 | return IRQ_HANDLED; | |
699 | } | |
700 | ||
701 | /* Opps problem detected */ | |
702 | return IRQ_NONE; | |
703 | } | |
704 | ||
705 | static irqreturn_t interrupt_wronly_transfer(struct driver_data *drv_data) | |
706 | { | |
707 | struct spi_message *msg = drv_data->cur_msg; | |
708 | void __iomem *regs = drv_data->regs; | |
709 | u32 status; | |
710 | irqreturn_t handled = IRQ_NONE; | |
711 | ||
712 | status = readl(regs + SPI_INT_STATUS); | |
713 | ||
714 | while (status & SPI_STATUS_TH) { | |
715 | dev_dbg(&drv_data->pdev->dev, | |
716 | "interrupt_wronly_transfer - status = 0x%08X\n", status); | |
717 | ||
718 | /* Pump data */ | |
719 | if (write(drv_data)) { | |
720 | writel(readl(regs + SPI_INT_STATUS) & ~SPI_INTEN, | |
721 | regs + SPI_INT_STATUS); | |
722 | ||
723 | dev_dbg(&drv_data->pdev->dev, | |
724 | "interrupt_wronly_transfer - end of tx\n"); | |
725 | ||
726 | if (flush(drv_data) == 0) | |
727 | dev_err(&drv_data->pdev->dev, | |
728 | "interrupt_wronly_transfer - " | |
729 | "flush failed\n"); | |
730 | ||
731 | /* End of transfer, update total byte transfered */ | |
732 | msg->actual_length += drv_data->len; | |
733 | ||
734 | /* Release chip select if requested, transfer delays are | |
735 | handled in pump_transfers */ | |
736 | if (drv_data->cs_change) | |
737 | drv_data->cs_control(SPI_CS_DEASSERT); | |
738 | ||
739 | /* Move to next transfer */ | |
740 | msg->state = next_transfer(drv_data); | |
741 | ||
742 | /* Schedule transfer tasklet */ | |
743 | tasklet_schedule(&drv_data->pump_transfers); | |
744 | ||
745 | return IRQ_HANDLED; | |
746 | } | |
747 | ||
748 | status = readl(regs + SPI_INT_STATUS); | |
749 | ||
750 | /* We did something */ | |
751 | handled = IRQ_HANDLED; | |
752 | } | |
753 | ||
754 | return handled; | |
755 | } | |
756 | ||
757 | static irqreturn_t interrupt_transfer(struct driver_data *drv_data) | |
758 | { | |
759 | struct spi_message *msg = drv_data->cur_msg; | |
760 | void __iomem *regs = drv_data->regs; | |
761 | u32 status; | |
762 | irqreturn_t handled = IRQ_NONE; | |
763 | unsigned long limit; | |
764 | ||
765 | status = readl(regs + SPI_INT_STATUS); | |
766 | ||
767 | while (status & (SPI_STATUS_TH | SPI_STATUS_RO)) { | |
768 | dev_dbg(&drv_data->pdev->dev, | |
769 | "interrupt_transfer - status = 0x%08X\n", status); | |
770 | ||
771 | if (status & SPI_STATUS_RO) { | |
772 | writel(readl(regs + SPI_INT_STATUS) & ~SPI_INTEN, | |
773 | regs + SPI_INT_STATUS); | |
774 | ||
775 | dev_warn(&drv_data->pdev->dev, | |
776 | "interrupt_transfer - fifo overun\n" | |
777 | " data not yet written = %d\n" | |
778 | " data not yet read = %d\n", | |
779 | data_to_write(drv_data), | |
780 | data_to_read(drv_data)); | |
781 | ||
782 | if (flush(drv_data) == 0) | |
783 | dev_err(&drv_data->pdev->dev, | |
784 | "interrupt_transfer - flush failed\n"); | |
785 | ||
786 | msg->state = ERROR_STATE; | |
787 | tasklet_schedule(&drv_data->pump_transfers); | |
788 | ||
789 | return IRQ_HANDLED; | |
790 | } | |
791 | ||
792 | /* Pump data */ | |
793 | read(drv_data); | |
794 | if (write(drv_data)) { | |
795 | writel(readl(regs + SPI_INT_STATUS) & ~SPI_INTEN, | |
796 | regs + SPI_INT_STATUS); | |
797 | ||
798 | dev_dbg(&drv_data->pdev->dev, | |
799 | "interrupt_transfer - end of tx\n"); | |
800 | ||
801 | /* Read trailing bytes */ | |
802 | limit = loops_per_jiffy << 1; | |
803 | while ((read(drv_data) == 0) && limit--); | |
804 | ||
805 | if (limit == 0) | |
806 | dev_err(&drv_data->pdev->dev, | |
807 | "interrupt_transfer - " | |
808 | "trailing byte read failed\n"); | |
809 | else | |
810 | dev_dbg(&drv_data->pdev->dev, | |
811 | "interrupt_transfer - end of rx\n"); | |
812 | ||
813 | /* End of transfer, update total byte transfered */ | |
814 | msg->actual_length += drv_data->len; | |
815 | ||
816 | /* Release chip select if requested, transfer delays are | |
817 | handled in pump_transfers */ | |
818 | if (drv_data->cs_change) | |
819 | drv_data->cs_control(SPI_CS_DEASSERT); | |
820 | ||
821 | /* Move to next transfer */ | |
822 | msg->state = next_transfer(drv_data); | |
823 | ||
824 | /* Schedule transfer tasklet */ | |
825 | tasklet_schedule(&drv_data->pump_transfers); | |
826 | ||
827 | return IRQ_HANDLED; | |
828 | } | |
829 | ||
830 | status = readl(regs + SPI_INT_STATUS); | |
831 | ||
832 | /* We did something */ | |
833 | handled = IRQ_HANDLED; | |
834 | } | |
835 | ||
836 | return handled; | |
837 | } | |
838 | ||
839 | static irqreturn_t spi_int(int irq, void *dev_id) | |
840 | { | |
841 | struct driver_data *drv_data = (struct driver_data *)dev_id; | |
842 | ||
843 | if (!drv_data->cur_msg) { | |
844 | dev_err(&drv_data->pdev->dev, | |
845 | "spi_int - bad message state\n"); | |
846 | /* Never fail */ | |
847 | return IRQ_HANDLED; | |
848 | } | |
849 | ||
850 | return drv_data->transfer_handler(drv_data); | |
851 | } | |
852 | ||
853 | static inline u32 spi_speed_hz(u32 data_rate) | |
854 | { | |
855 | return imx_get_perclk2() / (4 << ((data_rate) >> 13)); | |
856 | } | |
857 | ||
858 | static u32 spi_data_rate(u32 speed_hz) | |
859 | { | |
860 | u32 div; | |
861 | u32 quantized_hz = imx_get_perclk2() >> 2; | |
862 | ||
863 | for (div = SPI_PERCLK2_DIV_MIN; | |
864 | div <= SPI_PERCLK2_DIV_MAX; | |
865 | div++, quantized_hz >>= 1) { | |
866 | if (quantized_hz <= speed_hz) | |
867 | /* Max available speed LEQ required speed */ | |
868 | return div << 13; | |
869 | } | |
870 | return SPI_CONTROL_DATARATE_BAD; | |
871 | } | |
872 | ||
873 | static void pump_transfers(unsigned long data) | |
874 | { | |
875 | struct driver_data *drv_data = (struct driver_data *)data; | |
876 | struct spi_message *message; | |
877 | struct spi_transfer *transfer, *previous; | |
878 | struct chip_data *chip; | |
879 | void __iomem *regs; | |
880 | u32 tmp, control; | |
881 | ||
882 | dev_dbg(&drv_data->pdev->dev, "pump_transfer\n"); | |
883 | ||
884 | message = drv_data->cur_msg; | |
885 | ||
886 | /* Handle for abort */ | |
887 | if (message->state == ERROR_STATE) { | |
888 | message->status = -EIO; | |
889 | giveback(message, drv_data); | |
890 | return; | |
891 | } | |
892 | ||
893 | /* Handle end of message */ | |
894 | if (message->state == DONE_STATE) { | |
895 | message->status = 0; | |
896 | giveback(message, drv_data); | |
897 | return; | |
898 | } | |
899 | ||
900 | chip = drv_data->cur_chip; | |
901 | ||
902 | /* Delay if requested at end of transfer*/ | |
903 | transfer = drv_data->cur_transfer; | |
904 | if (message->state == RUNNING_STATE) { | |
905 | previous = list_entry(transfer->transfer_list.prev, | |
906 | struct spi_transfer, | |
907 | transfer_list); | |
908 | if (previous->delay_usecs) | |
909 | udelay(previous->delay_usecs); | |
910 | } else { | |
911 | /* START_STATE */ | |
912 | message->state = RUNNING_STATE; | |
913 | drv_data->cs_control = chip->cs_control; | |
914 | } | |
915 | ||
916 | transfer = drv_data->cur_transfer; | |
917 | drv_data->tx = (void *)transfer->tx_buf; | |
918 | drv_data->tx_end = drv_data->tx + transfer->len; | |
919 | drv_data->rx = transfer->rx_buf; | |
920 | drv_data->rx_end = drv_data->rx + transfer->len; | |
921 | drv_data->rx_dma = transfer->rx_dma; | |
922 | drv_data->tx_dma = transfer->tx_dma; | |
923 | drv_data->len = transfer->len; | |
924 | drv_data->cs_change = transfer->cs_change; | |
925 | drv_data->rd_only = (drv_data->tx == NULL); | |
926 | ||
927 | regs = drv_data->regs; | |
928 | control = readl(regs + SPI_CONTROL); | |
929 | ||
930 | /* Bits per word setup */ | |
931 | tmp = transfer->bits_per_word; | |
932 | if (tmp == 0) { | |
933 | /* Use device setup */ | |
934 | tmp = chip->bits_per_word; | |
935 | drv_data->n_bytes = chip->n_bytes; | |
936 | } else | |
937 | /* Use per-transfer setup */ | |
938 | drv_data->n_bytes = (tmp <= 8) ? 1 : 2; | |
939 | u32_EDIT(control, SPI_CONTROL_BITCOUNT_MASK, tmp - 1); | |
940 | ||
941 | /* Speed setup (surely valid because already checked) */ | |
942 | tmp = transfer->speed_hz; | |
943 | if (tmp == 0) | |
944 | tmp = chip->max_speed_hz; | |
945 | tmp = spi_data_rate(tmp); | |
946 | u32_EDIT(control, SPI_CONTROL_DATARATE, tmp); | |
947 | ||
948 | writel(control, regs + SPI_CONTROL); | |
949 | ||
950 | /* Assert device chip-select */ | |
951 | drv_data->cs_control(SPI_CS_ASSERT); | |
952 | ||
953 | /* DMA cannot read/write SPI FIFOs other than 16 bits at a time; hence | |
954 | if bits_per_word is less or equal 8 PIO transfers are performed. | |
955 | Moreover DMA is convinient for transfer length bigger than FIFOs | |
956 | byte size. */ | |
957 | if ((drv_data->n_bytes == 2) && | |
958 | (drv_data->len > SPI_FIFO_DEPTH*SPI_FIFO_BYTE_WIDTH) && | |
959 | (map_dma_buffers(drv_data) == 0)) { | |
960 | dev_dbg(&drv_data->pdev->dev, | |
961 | "pump dma transfer\n" | |
962 | " tx = %p\n" | |
963 | " tx_dma = %08X\n" | |
964 | " rx = %p\n" | |
965 | " rx_dma = %08X\n" | |
966 | " len = %d\n", | |
967 | drv_data->tx, | |
968 | (unsigned int)drv_data->tx_dma, | |
969 | drv_data->rx, | |
970 | (unsigned int)drv_data->rx_dma, | |
971 | drv_data->len); | |
972 | ||
973 | /* Ensure we have the correct interrupt handler */ | |
974 | drv_data->transfer_handler = dma_transfer; | |
975 | ||
976 | /* Trigger transfer */ | |
977 | writel(readl(regs + SPI_CONTROL) | SPI_CONTROL_XCH, | |
978 | regs + SPI_CONTROL); | |
979 | ||
980 | /* Setup tx DMA */ | |
981 | if (drv_data->tx) | |
982 | /* Linear source address */ | |
983 | CCR(drv_data->tx_channel) = | |
984 | CCR_DMOD_FIFO | | |
985 | CCR_SMOD_LINEAR | | |
986 | CCR_SSIZ_32 | CCR_DSIZ_16 | | |
987 | CCR_REN; | |
988 | else | |
989 | /* Read only transfer -> fixed source address for | |
990 | dummy write to achive read */ | |
991 | CCR(drv_data->tx_channel) = | |
992 | CCR_DMOD_FIFO | | |
993 | CCR_SMOD_FIFO | | |
994 | CCR_SSIZ_32 | CCR_DSIZ_16 | | |
995 | CCR_REN; | |
996 | ||
997 | imx_dma_setup_single( | |
998 | drv_data->tx_channel, | |
999 | drv_data->tx_dma, | |
1000 | drv_data->len, | |
1001 | drv_data->rd_data_phys + 4, | |
1002 | DMA_MODE_WRITE); | |
1003 | ||
1004 | if (drv_data->rx) { | |
1005 | /* Setup rx DMA for linear destination address */ | |
1006 | CCR(drv_data->rx_channel) = | |
1007 | CCR_DMOD_LINEAR | | |
1008 | CCR_SMOD_FIFO | | |
1009 | CCR_DSIZ_32 | CCR_SSIZ_16 | | |
1010 | CCR_REN; | |
1011 | imx_dma_setup_single( | |
1012 | drv_data->rx_channel, | |
1013 | drv_data->rx_dma, | |
1014 | drv_data->len, | |
1015 | drv_data->rd_data_phys, | |
1016 | DMA_MODE_READ); | |
1017 | imx_dma_enable(drv_data->rx_channel); | |
1018 | ||
1019 | /* Enable SPI interrupt */ | |
1020 | writel(SPI_INTEN_RO, regs + SPI_INT_STATUS); | |
1021 | ||
1022 | /* Set SPI to request DMA service on both | |
1023 | Rx and Tx half fifo watermark */ | |
1024 | writel(SPI_DMA_RHDEN | SPI_DMA_THDEN, regs + SPI_DMA); | |
1025 | } else | |
1026 | /* Write only access -> set SPI to request DMA | |
1027 | service on Tx half fifo watermark */ | |
1028 | writel(SPI_DMA_THDEN, regs + SPI_DMA); | |
1029 | ||
1030 | imx_dma_enable(drv_data->tx_channel); | |
1031 | } else { | |
1032 | dev_dbg(&drv_data->pdev->dev, | |
1033 | "pump pio transfer\n" | |
1034 | " tx = %p\n" | |
1035 | " rx = %p\n" | |
1036 | " len = %d\n", | |
1037 | drv_data->tx, | |
1038 | drv_data->rx, | |
1039 | drv_data->len); | |
1040 | ||
1041 | /* Ensure we have the correct interrupt handler */ | |
1042 | if (drv_data->rx) | |
1043 | drv_data->transfer_handler = interrupt_transfer; | |
1044 | else | |
1045 | drv_data->transfer_handler = interrupt_wronly_transfer; | |
1046 | ||
1047 | /* Enable SPI interrupt */ | |
1048 | if (drv_data->rx) | |
1049 | writel(SPI_INTEN_TH | SPI_INTEN_RO, | |
1050 | regs + SPI_INT_STATUS); | |
1051 | else | |
1052 | writel(SPI_INTEN_TH, regs + SPI_INT_STATUS); | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | static void pump_messages(struct work_struct *work) | |
1057 | { | |
1058 | struct driver_data *drv_data = | |
1059 | container_of(work, struct driver_data, work); | |
1060 | unsigned long flags; | |
1061 | ||
1062 | /* Lock queue and check for queue work */ | |
1063 | spin_lock_irqsave(&drv_data->lock, flags); | |
1064 | if (list_empty(&drv_data->queue) || drv_data->run == QUEUE_STOPPED) { | |
1065 | drv_data->busy = 0; | |
1066 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1067 | return; | |
1068 | } | |
1069 | ||
1070 | /* Make sure we are not already running a message */ | |
1071 | if (drv_data->cur_msg) { | |
1072 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1073 | return; | |
1074 | } | |
1075 | ||
1076 | /* Extract head of queue */ | |
1077 | drv_data->cur_msg = list_entry(drv_data->queue.next, | |
1078 | struct spi_message, queue); | |
1079 | list_del_init(&drv_data->cur_msg->queue); | |
1080 | drv_data->busy = 1; | |
1081 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1082 | ||
1083 | /* Initial message state */ | |
1084 | drv_data->cur_msg->state = START_STATE; | |
1085 | drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next, | |
1086 | struct spi_transfer, | |
1087 | transfer_list); | |
1088 | ||
1089 | /* Setup the SPI using the per chip configuration */ | |
1090 | drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi); | |
1091 | restore_state(drv_data); | |
1092 | ||
1093 | /* Mark as busy and launch transfers */ | |
1094 | tasklet_schedule(&drv_data->pump_transfers); | |
1095 | } | |
1096 | ||
1097 | static int transfer(struct spi_device *spi, struct spi_message *msg) | |
1098 | { | |
1099 | struct driver_data *drv_data = spi_master_get_devdata(spi->master); | |
1100 | u32 min_speed_hz, max_speed_hz, tmp; | |
1101 | struct spi_transfer *trans; | |
1102 | unsigned long flags; | |
1103 | ||
1104 | msg->actual_length = 0; | |
1105 | ||
1106 | /* Per transfer setup check */ | |
1107 | min_speed_hz = spi_speed_hz(SPI_CONTROL_DATARATE_MIN); | |
1108 | max_speed_hz = spi->max_speed_hz; | |
1109 | list_for_each_entry(trans, &msg->transfers, transfer_list) { | |
1110 | tmp = trans->bits_per_word; | |
1111 | if (tmp > 16) { | |
1112 | dev_err(&drv_data->pdev->dev, | |
1113 | "message rejected : " | |
1114 | "invalid transfer bits_per_word (%d bits)\n", | |
1115 | tmp); | |
1116 | goto msg_rejected; | |
1117 | } | |
1118 | tmp = trans->speed_hz; | |
1119 | if (tmp) { | |
1120 | if (tmp < min_speed_hz) { | |
1121 | dev_err(&drv_data->pdev->dev, | |
1122 | "message rejected : " | |
1123 | "device min speed (%d Hz) exceeds " | |
1124 | "required transfer speed (%d Hz)\n", | |
1125 | min_speed_hz, | |
1126 | tmp); | |
1127 | goto msg_rejected; | |
1128 | } else if (tmp > max_speed_hz) { | |
1129 | dev_err(&drv_data->pdev->dev, | |
1130 | "message rejected : " | |
1131 | "transfer speed (%d Hz) exceeds " | |
1132 | "device max speed (%d Hz)\n", | |
1133 | tmp, | |
1134 | max_speed_hz); | |
1135 | goto msg_rejected; | |
1136 | } | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | /* Message accepted */ | |
1141 | msg->status = -EINPROGRESS; | |
1142 | msg->state = START_STATE; | |
1143 | ||
1144 | spin_lock_irqsave(&drv_data->lock, flags); | |
1145 | if (drv_data->run == QUEUE_STOPPED) { | |
1146 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1147 | return -ESHUTDOWN; | |
1148 | } | |
1149 | ||
1150 | list_add_tail(&msg->queue, &drv_data->queue); | |
1151 | if (drv_data->run == QUEUE_RUNNING && !drv_data->busy) | |
1152 | queue_work(drv_data->workqueue, &drv_data->work); | |
1153 | ||
1154 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1155 | return 0; | |
1156 | ||
1157 | msg_rejected: | |
1158 | /* Message rejected and not queued */ | |
1159 | msg->status = -EINVAL; | |
1160 | msg->state = ERROR_STATE; | |
1161 | if (msg->complete) | |
1162 | msg->complete(msg->context); | |
1163 | return -EINVAL; | |
1164 | } | |
1165 | ||
dccd573b DB |
1166 | /* the spi->mode bits understood by this driver: */ |
1167 | #define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH) | |
1168 | ||
69c202af AP |
1169 | /* On first setup bad values must free chip_data memory since will cause |
1170 | spi_new_device to fail. Bad value setup from protocol driver are simply not | |
1171 | applied and notified to the calling driver. */ | |
1172 | static int setup(struct spi_device *spi) | |
1173 | { | |
1174 | struct spi_imx_chip *chip_info; | |
1175 | struct chip_data *chip; | |
1176 | int first_setup = 0; | |
1177 | u32 tmp; | |
1178 | int status = 0; | |
1179 | ||
dccd573b DB |
1180 | if (spi->mode & ~MODEBITS) { |
1181 | dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n", | |
1182 | spi->mode & ~MODEBITS); | |
1183 | return -EINVAL; | |
1184 | } | |
1185 | ||
69c202af AP |
1186 | /* Get controller data */ |
1187 | chip_info = spi->controller_data; | |
1188 | ||
1189 | /* Get controller_state */ | |
1190 | chip = spi_get_ctldata(spi); | |
1191 | if (chip == NULL) { | |
1192 | first_setup = 1; | |
1193 | ||
1194 | chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); | |
1195 | if (!chip) { | |
1196 | dev_err(&spi->dev, | |
1197 | "setup - cannot allocate controller state"); | |
1198 | return -ENOMEM; | |
1199 | } | |
1200 | chip->control = SPI_DEFAULT_CONTROL; | |
1201 | ||
1202 | if (chip_info == NULL) { | |
1203 | /* spi_board_info.controller_data not is supplied */ | |
1204 | chip_info = kzalloc(sizeof(struct spi_imx_chip), | |
1205 | GFP_KERNEL); | |
1206 | if (!chip_info) { | |
1207 | dev_err(&spi->dev, | |
1208 | "setup - " | |
1209 | "cannot allocate controller data"); | |
1210 | status = -ENOMEM; | |
1211 | goto err_first_setup; | |
1212 | } | |
1213 | /* Set controller data default value */ | |
1214 | chip_info->enable_loopback = | |
1215 | SPI_DEFAULT_ENABLE_LOOPBACK; | |
1216 | chip_info->enable_dma = SPI_DEFAULT_ENABLE_DMA; | |
1217 | chip_info->ins_ss_pulse = 1; | |
1218 | chip_info->bclk_wait = SPI_DEFAULT_PERIOD_WAIT; | |
1219 | chip_info->cs_control = null_cs_control; | |
1220 | } | |
1221 | } | |
1222 | ||
1223 | /* Now set controller state based on controller data */ | |
1224 | ||
1225 | if (first_setup) { | |
1226 | /* SPI loopback */ | |
1227 | if (chip_info->enable_loopback) | |
1228 | chip->test = SPI_TEST_LBC; | |
1229 | else | |
1230 | chip->test = 0; | |
1231 | ||
1232 | /* SPI dma driven */ | |
1233 | chip->enable_dma = chip_info->enable_dma; | |
1234 | ||
1235 | /* SPI /SS pulse between spi burst */ | |
1236 | if (chip_info->ins_ss_pulse) | |
1237 | u32_EDIT(chip->control, | |
1238 | SPI_CONTROL_SSCTL, SPI_CONTROL_SSCTL_1); | |
1239 | else | |
1240 | u32_EDIT(chip->control, | |
1241 | SPI_CONTROL_SSCTL, SPI_CONTROL_SSCTL_0); | |
1242 | ||
1243 | /* SPI bclk waits between each bits_per_word spi burst */ | |
1244 | if (chip_info->bclk_wait > SPI_PERIOD_MAX_WAIT) { | |
1245 | dev_err(&spi->dev, | |
1246 | "setup - " | |
1247 | "bclk_wait exceeds max allowed (%d)\n", | |
1248 | SPI_PERIOD_MAX_WAIT); | |
1249 | goto err_first_setup; | |
1250 | } | |
1251 | chip->period = SPI_PERIOD_CSRC_BCLK | | |
1252 | (chip_info->bclk_wait & SPI_PERIOD_WAIT); | |
1253 | } | |
1254 | ||
1255 | /* SPI mode */ | |
1256 | tmp = spi->mode; | |
69c202af AP |
1257 | if (tmp & SPI_CS_HIGH) { |
1258 | u32_EDIT(chip->control, | |
1259 | SPI_CONTROL_SSPOL, SPI_CONTROL_SSPOL_ACT_HIGH); | |
1260 | } | |
1261 | switch (tmp & SPI_MODE_3) { | |
1262 | case SPI_MODE_0: | |
1263 | tmp = 0; | |
1264 | break; | |
1265 | case SPI_MODE_1: | |
1266 | tmp = SPI_CONTROL_PHA_1; | |
1267 | break; | |
1268 | case SPI_MODE_2: | |
1269 | tmp = SPI_CONTROL_POL_ACT_LOW; | |
1270 | break; | |
1271 | default: | |
1272 | /* SPI_MODE_3 */ | |
1273 | tmp = SPI_CONTROL_PHA_1 | SPI_CONTROL_POL_ACT_LOW; | |
1274 | break; | |
1275 | } | |
1276 | u32_EDIT(chip->control, SPI_CONTROL_POL | SPI_CONTROL_PHA, tmp); | |
1277 | ||
1278 | /* SPI word width */ | |
1279 | tmp = spi->bits_per_word; | |
1280 | if (tmp == 0) { | |
1281 | tmp = 8; | |
1282 | spi->bits_per_word = 8; | |
1283 | } else if (tmp > 16) { | |
1284 | status = -EINVAL; | |
1285 | dev_err(&spi->dev, | |
1286 | "setup - " | |
1287 | "invalid bits_per_word (%d)\n", | |
1288 | tmp); | |
1289 | if (first_setup) | |
1290 | goto err_first_setup; | |
1291 | else { | |
1292 | /* Undo setup using chip as backup copy */ | |
1293 | tmp = chip->bits_per_word; | |
1294 | spi->bits_per_word = tmp; | |
1295 | } | |
1296 | } | |
1297 | chip->bits_per_word = tmp; | |
1298 | u32_EDIT(chip->control, SPI_CONTROL_BITCOUNT_MASK, tmp - 1); | |
1299 | chip->n_bytes = (tmp <= 8) ? 1 : 2; | |
1300 | ||
1301 | /* SPI datarate */ | |
1302 | tmp = spi_data_rate(spi->max_speed_hz); | |
1303 | if (tmp == SPI_CONTROL_DATARATE_BAD) { | |
1304 | status = -EINVAL; | |
1305 | dev_err(&spi->dev, | |
1306 | "setup - " | |
1307 | "HW min speed (%d Hz) exceeds required " | |
1308 | "max speed (%d Hz)\n", | |
1309 | spi_speed_hz(SPI_CONTROL_DATARATE_MIN), | |
1310 | spi->max_speed_hz); | |
1311 | if (first_setup) | |
1312 | goto err_first_setup; | |
1313 | else | |
1314 | /* Undo setup using chip as backup copy */ | |
1315 | spi->max_speed_hz = chip->max_speed_hz; | |
1316 | } else { | |
1317 | u32_EDIT(chip->control, SPI_CONTROL_DATARATE, tmp); | |
1318 | /* Actual rounded max_speed_hz */ | |
1319 | tmp = spi_speed_hz(tmp); | |
1320 | spi->max_speed_hz = tmp; | |
1321 | chip->max_speed_hz = tmp; | |
1322 | } | |
1323 | ||
1324 | /* SPI chip-select management */ | |
1325 | if (chip_info->cs_control) | |
1326 | chip->cs_control = chip_info->cs_control; | |
1327 | else | |
1328 | chip->cs_control = null_cs_control; | |
1329 | ||
1330 | /* Save controller_state */ | |
1331 | spi_set_ctldata(spi, chip); | |
1332 | ||
1333 | /* Summary */ | |
1334 | dev_dbg(&spi->dev, | |
1335 | "setup succeded\n" | |
1336 | " loopback enable = %s\n" | |
1337 | " dma enable = %s\n" | |
1338 | " insert /ss pulse = %s\n" | |
1339 | " period wait = %d\n" | |
1340 | " mode = %d\n" | |
1341 | " bits per word = %d\n" | |
1342 | " min speed = %d Hz\n" | |
1343 | " rounded max speed = %d Hz\n", | |
1344 | chip->test & SPI_TEST_LBC ? "Yes" : "No", | |
1345 | chip->enable_dma ? "Yes" : "No", | |
1346 | chip->control & SPI_CONTROL_SSCTL ? "Yes" : "No", | |
1347 | chip->period & SPI_PERIOD_WAIT, | |
1348 | spi->mode, | |
1349 | spi->bits_per_word, | |
1350 | spi_speed_hz(SPI_CONTROL_DATARATE_MIN), | |
1351 | spi->max_speed_hz); | |
ac140a8f | 1352 | return status; |
69c202af AP |
1353 | |
1354 | err_first_setup: | |
1355 | kfree(chip); | |
1356 | return status; | |
1357 | } | |
1358 | ||
bb2d1c36 | 1359 | static void cleanup(struct spi_device *spi) |
69c202af | 1360 | { |
bb2d1c36 | 1361 | kfree(spi_get_ctldata(spi)); |
69c202af AP |
1362 | } |
1363 | ||
1364 | static int init_queue(struct driver_data *drv_data) | |
1365 | { | |
1366 | INIT_LIST_HEAD(&drv_data->queue); | |
1367 | spin_lock_init(&drv_data->lock); | |
1368 | ||
1369 | drv_data->run = QUEUE_STOPPED; | |
1370 | drv_data->busy = 0; | |
1371 | ||
1372 | tasklet_init(&drv_data->pump_transfers, | |
1373 | pump_transfers, (unsigned long)drv_data); | |
1374 | ||
1375 | INIT_WORK(&drv_data->work, pump_messages); | |
1376 | drv_data->workqueue = create_singlethread_workqueue( | |
1377 | drv_data->master->cdev.dev->bus_id); | |
1378 | if (drv_data->workqueue == NULL) | |
1379 | return -EBUSY; | |
1380 | ||
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | static int start_queue(struct driver_data *drv_data) | |
1385 | { | |
1386 | unsigned long flags; | |
1387 | ||
1388 | spin_lock_irqsave(&drv_data->lock, flags); | |
1389 | ||
1390 | if (drv_data->run == QUEUE_RUNNING || drv_data->busy) { | |
1391 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1392 | return -EBUSY; | |
1393 | } | |
1394 | ||
1395 | drv_data->run = QUEUE_RUNNING; | |
1396 | drv_data->cur_msg = NULL; | |
1397 | drv_data->cur_transfer = NULL; | |
1398 | drv_data->cur_chip = NULL; | |
1399 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1400 | ||
1401 | queue_work(drv_data->workqueue, &drv_data->work); | |
1402 | ||
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | static int stop_queue(struct driver_data *drv_data) | |
1407 | { | |
1408 | unsigned long flags; | |
1409 | unsigned limit = 500; | |
1410 | int status = 0; | |
1411 | ||
1412 | spin_lock_irqsave(&drv_data->lock, flags); | |
1413 | ||
1414 | /* This is a bit lame, but is optimized for the common execution path. | |
1415 | * A wait_queue on the drv_data->busy could be used, but then the common | |
1416 | * execution path (pump_messages) would be required to call wake_up or | |
1417 | * friends on every SPI message. Do this instead */ | |
1418 | drv_data->run = QUEUE_STOPPED; | |
1419 | while (!list_empty(&drv_data->queue) && drv_data->busy && limit--) { | |
1420 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1421 | msleep(10); | |
1422 | spin_lock_irqsave(&drv_data->lock, flags); | |
1423 | } | |
1424 | ||
1425 | if (!list_empty(&drv_data->queue) || drv_data->busy) | |
1426 | status = -EBUSY; | |
1427 | ||
1428 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1429 | ||
1430 | return status; | |
1431 | } | |
1432 | ||
1433 | static int destroy_queue(struct driver_data *drv_data) | |
1434 | { | |
1435 | int status; | |
1436 | ||
1437 | status = stop_queue(drv_data); | |
1438 | if (status != 0) | |
1439 | return status; | |
1440 | ||
1441 | if (drv_data->workqueue) | |
1442 | destroy_workqueue(drv_data->workqueue); | |
1443 | ||
1444 | return 0; | |
1445 | } | |
1446 | ||
1447 | static int spi_imx_probe(struct platform_device *pdev) | |
1448 | { | |
1449 | struct device *dev = &pdev->dev; | |
1450 | struct spi_imx_master *platform_info; | |
1451 | struct spi_master *master; | |
1452 | struct driver_data *drv_data = NULL; | |
1453 | struct resource *res; | |
1454 | int irq, status = 0; | |
1455 | ||
1456 | platform_info = dev->platform_data; | |
1457 | if (platform_info == NULL) { | |
1458 | dev_err(&pdev->dev, "probe - no platform data supplied\n"); | |
1459 | status = -ENODEV; | |
1460 | goto err_no_pdata; | |
1461 | } | |
1462 | ||
1463 | /* Allocate master with space for drv_data */ | |
1464 | master = spi_alloc_master(dev, sizeof(struct driver_data)); | |
1465 | if (!master) { | |
1466 | dev_err(&pdev->dev, "probe - cannot alloc spi_master\n"); | |
1467 | status = -ENOMEM; | |
1468 | goto err_no_mem; | |
1469 | } | |
1470 | drv_data = spi_master_get_devdata(master); | |
1471 | drv_data->master = master; | |
1472 | drv_data->master_info = platform_info; | |
1473 | drv_data->pdev = pdev; | |
1474 | ||
1475 | master->bus_num = pdev->id; | |
1476 | master->num_chipselect = platform_info->num_chipselect; | |
1477 | master->cleanup = cleanup; | |
1478 | master->setup = setup; | |
1479 | master->transfer = transfer; | |
1480 | ||
1481 | drv_data->dummy_dma_buf = SPI_DUMMY_u32; | |
1482 | ||
1483 | /* Find and map resources */ | |
1484 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1485 | if (!res) { | |
1486 | dev_err(&pdev->dev, "probe - MEM resources not defined\n"); | |
1487 | status = -ENODEV; | |
1488 | goto err_no_iores; | |
1489 | } | |
1490 | drv_data->ioarea = request_mem_region(res->start, | |
1491 | res->end - res->start + 1, | |
1492 | pdev->name); | |
1493 | if (drv_data->ioarea == NULL) { | |
1494 | dev_err(&pdev->dev, "probe - cannot reserve region\n"); | |
1495 | status = -ENXIO; | |
1496 | goto err_no_iores; | |
1497 | } | |
1498 | drv_data->regs = ioremap(res->start, res->end - res->start + 1); | |
1499 | if (drv_data->regs == NULL) { | |
1500 | dev_err(&pdev->dev, "probe - cannot map IO\n"); | |
1501 | status = -ENXIO; | |
1502 | goto err_no_iomap; | |
1503 | } | |
1504 | drv_data->rd_data_phys = (dma_addr_t)res->start; | |
1505 | ||
1506 | /* Attach to IRQ */ | |
1507 | irq = platform_get_irq(pdev, 0); | |
1508 | if (irq < 0) { | |
1509 | dev_err(&pdev->dev, "probe - IRQ resource not defined\n"); | |
1510 | status = -ENODEV; | |
1511 | goto err_no_irqres; | |
1512 | } | |
1513 | status = request_irq(irq, spi_int, IRQF_DISABLED, dev->bus_id, drv_data); | |
1514 | if (status < 0) { | |
1515 | dev_err(&pdev->dev, "probe - cannot get IRQ (%d)\n", status); | |
1516 | goto err_no_irqres; | |
1517 | } | |
1518 | ||
1519 | /* Setup DMA if requested */ | |
1520 | drv_data->tx_channel = -1; | |
1521 | drv_data->rx_channel = -1; | |
1522 | if (platform_info->enable_dma) { | |
1523 | /* Get rx DMA channel */ | |
1524 | status = imx_dma_request_by_prio(&drv_data->rx_channel, | |
1525 | "spi_imx_rx", DMA_PRIO_HIGH); | |
1526 | if (status < 0) { | |
1527 | dev_err(dev, | |
1528 | "probe - problem (%d) requesting rx channel\n", | |
1529 | status); | |
1530 | goto err_no_rxdma; | |
1531 | } else | |
1532 | imx_dma_setup_handlers(drv_data->rx_channel, NULL, | |
1533 | dma_err_handler, drv_data); | |
1534 | ||
1535 | /* Get tx DMA channel */ | |
1536 | status = imx_dma_request_by_prio(&drv_data->tx_channel, | |
1537 | "spi_imx_tx", DMA_PRIO_MEDIUM); | |
1538 | if (status < 0) { | |
1539 | dev_err(dev, | |
1540 | "probe - problem (%d) requesting tx channel\n", | |
1541 | status); | |
1542 | imx_dma_free(drv_data->rx_channel); | |
1543 | goto err_no_txdma; | |
1544 | } else | |
1545 | imx_dma_setup_handlers(drv_data->tx_channel, | |
1546 | dma_tx_handler, dma_err_handler, | |
1547 | drv_data); | |
1548 | ||
1549 | /* Set request source and burst length for allocated channels */ | |
1550 | switch (drv_data->pdev->id) { | |
1551 | case 1: | |
1552 | /* Using SPI1 */ | |
1553 | RSSR(drv_data->rx_channel) = DMA_REQ_SPI1_R; | |
1554 | RSSR(drv_data->tx_channel) = DMA_REQ_SPI1_T; | |
1555 | break; | |
1556 | case 2: | |
1557 | /* Using SPI2 */ | |
1558 | RSSR(drv_data->rx_channel) = DMA_REQ_SPI2_R; | |
1559 | RSSR(drv_data->tx_channel) = DMA_REQ_SPI2_T; | |
1560 | break; | |
1561 | default: | |
1562 | dev_err(dev, "probe - bad SPI Id\n"); | |
1563 | imx_dma_free(drv_data->rx_channel); | |
1564 | imx_dma_free(drv_data->tx_channel); | |
1565 | status = -ENODEV; | |
1566 | goto err_no_devid; | |
1567 | } | |
1568 | BLR(drv_data->rx_channel) = SPI_DMA_BLR; | |
1569 | BLR(drv_data->tx_channel) = SPI_DMA_BLR; | |
1570 | } | |
1571 | ||
1572 | /* Load default SPI configuration */ | |
1573 | writel(SPI_RESET_START, drv_data->regs + SPI_RESET); | |
1574 | writel(0, drv_data->regs + SPI_RESET); | |
1575 | writel(SPI_DEFAULT_CONTROL, drv_data->regs + SPI_CONTROL); | |
1576 | ||
1577 | /* Initial and start queue */ | |
1578 | status = init_queue(drv_data); | |
1579 | if (status != 0) { | |
1580 | dev_err(&pdev->dev, "probe - problem initializing queue\n"); | |
1581 | goto err_init_queue; | |
1582 | } | |
1583 | status = start_queue(drv_data); | |
1584 | if (status != 0) { | |
1585 | dev_err(&pdev->dev, "probe - problem starting queue\n"); | |
1586 | goto err_start_queue; | |
1587 | } | |
1588 | ||
1589 | /* Register with the SPI framework */ | |
1590 | platform_set_drvdata(pdev, drv_data); | |
1591 | status = spi_register_master(master); | |
1592 | if (status != 0) { | |
1593 | dev_err(&pdev->dev, "probe - problem registering spi master\n"); | |
1594 | goto err_spi_register; | |
1595 | } | |
1596 | ||
1597 | dev_dbg(dev, "probe succeded\n"); | |
1598 | return 0; | |
1599 | ||
1600 | err_init_queue: | |
1601 | err_start_queue: | |
1602 | err_spi_register: | |
1603 | destroy_queue(drv_data); | |
1604 | ||
1605 | err_no_rxdma: | |
1606 | err_no_txdma: | |
1607 | err_no_devid: | |
1608 | free_irq(irq, drv_data); | |
1609 | ||
1610 | err_no_irqres: | |
1611 | iounmap(drv_data->regs); | |
1612 | ||
1613 | err_no_iomap: | |
1614 | release_resource(drv_data->ioarea); | |
1615 | kfree(drv_data->ioarea); | |
1616 | ||
1617 | err_no_iores: | |
1618 | spi_master_put(master); | |
1619 | ||
1620 | err_no_pdata: | |
1621 | err_no_mem: | |
1622 | return status; | |
1623 | } | |
1624 | ||
1625 | static int __devexit spi_imx_remove(struct platform_device *pdev) | |
1626 | { | |
1627 | struct driver_data *drv_data = platform_get_drvdata(pdev); | |
1628 | int irq; | |
1629 | int status = 0; | |
1630 | ||
1631 | if (!drv_data) | |
1632 | return 0; | |
1633 | ||
1634 | tasklet_kill(&drv_data->pump_transfers); | |
1635 | ||
1636 | /* Remove the queue */ | |
1637 | status = destroy_queue(drv_data); | |
1638 | if (status != 0) { | |
1639 | dev_err(&pdev->dev, "queue remove failed (%d)\n", status); | |
1640 | return status; | |
1641 | } | |
1642 | ||
1643 | /* Reset SPI */ | |
1644 | writel(SPI_RESET_START, drv_data->regs + SPI_RESET); | |
1645 | writel(0, drv_data->regs + SPI_RESET); | |
1646 | ||
1647 | /* Release DMA */ | |
1648 | if (drv_data->master_info->enable_dma) { | |
1649 | RSSR(drv_data->rx_channel) = 0; | |
1650 | RSSR(drv_data->tx_channel) = 0; | |
1651 | imx_dma_free(drv_data->tx_channel); | |
1652 | imx_dma_free(drv_data->rx_channel); | |
1653 | } | |
1654 | ||
1655 | /* Release IRQ */ | |
1656 | irq = platform_get_irq(pdev, 0); | |
1657 | if (irq >= 0) | |
1658 | free_irq(irq, drv_data); | |
1659 | ||
1660 | /* Release map resources */ | |
1661 | iounmap(drv_data->regs); | |
1662 | release_resource(drv_data->ioarea); | |
1663 | kfree(drv_data->ioarea); | |
1664 | ||
1665 | /* Disconnect from the SPI framework */ | |
1666 | spi_unregister_master(drv_data->master); | |
1667 | spi_master_put(drv_data->master); | |
1668 | ||
1669 | /* Prevent double remove */ | |
1670 | platform_set_drvdata(pdev, NULL); | |
1671 | ||
1672 | dev_dbg(&pdev->dev, "remove succeded\n"); | |
1673 | ||
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | static void spi_imx_shutdown(struct platform_device *pdev) | |
1678 | { | |
1679 | struct driver_data *drv_data = platform_get_drvdata(pdev); | |
1680 | ||
1681 | /* Reset SPI */ | |
1682 | writel(SPI_RESET_START, drv_data->regs + SPI_RESET); | |
1683 | writel(0, drv_data->regs + SPI_RESET); | |
1684 | ||
1685 | dev_dbg(&pdev->dev, "shutdown succeded\n"); | |
1686 | } | |
1687 | ||
1688 | #ifdef CONFIG_PM | |
1689 | static int suspend_devices(struct device *dev, void *pm_message) | |
1690 | { | |
1691 | pm_message_t *state = pm_message; | |
1692 | ||
1693 | if (dev->power.power_state.event != state->event) { | |
1694 | dev_warn(dev, "pm state does not match request\n"); | |
1695 | return -1; | |
1696 | } | |
1697 | ||
1698 | return 0; | |
1699 | } | |
1700 | ||
1701 | static int spi_imx_suspend(struct platform_device *pdev, pm_message_t state) | |
1702 | { | |
1703 | struct driver_data *drv_data = platform_get_drvdata(pdev); | |
1704 | int status = 0; | |
1705 | ||
1706 | status = stop_queue(drv_data); | |
1707 | if (status != 0) { | |
1708 | dev_warn(&pdev->dev, "suspend cannot stop queue\n"); | |
1709 | return status; | |
1710 | } | |
1711 | ||
1712 | dev_dbg(&pdev->dev, "suspended\n"); | |
1713 | ||
1714 | return 0; | |
1715 | } | |
1716 | ||
1717 | static int spi_imx_resume(struct platform_device *pdev) | |
1718 | { | |
1719 | struct driver_data *drv_data = platform_get_drvdata(pdev); | |
1720 | int status = 0; | |
1721 | ||
1722 | /* Start the queue running */ | |
1723 | status = start_queue(drv_data); | |
1724 | if (status != 0) | |
1725 | dev_err(&pdev->dev, "problem starting queue (%d)\n", status); | |
1726 | else | |
1727 | dev_dbg(&pdev->dev, "resumed\n"); | |
1728 | ||
1729 | return status; | |
1730 | } | |
1731 | #else | |
1732 | #define spi_imx_suspend NULL | |
1733 | #define spi_imx_resume NULL | |
1734 | #endif /* CONFIG_PM */ | |
1735 | ||
1736 | static struct platform_driver driver = { | |
1737 | .driver = { | |
fc3ba952 | 1738 | .name = "spi_imx", |
69c202af AP |
1739 | .bus = &platform_bus_type, |
1740 | .owner = THIS_MODULE, | |
1741 | }, | |
1742 | .probe = spi_imx_probe, | |
1743 | .remove = __devexit_p(spi_imx_remove), | |
1744 | .shutdown = spi_imx_shutdown, | |
1745 | .suspend = spi_imx_suspend, | |
1746 | .resume = spi_imx_resume, | |
1747 | }; | |
1748 | ||
1749 | static int __init spi_imx_init(void) | |
1750 | { | |
1751 | return platform_driver_register(&driver); | |
1752 | } | |
1753 | module_init(spi_imx_init); | |
1754 | ||
1755 | static void __exit spi_imx_exit(void) | |
1756 | { | |
1757 | platform_driver_unregister(&driver); | |
1758 | } | |
1759 | module_exit(spi_imx_exit); | |
1760 | ||
1761 | MODULE_AUTHOR("Andrea Paterniani, <a.paterniani@swapp-eng.it>"); | |
1762 | MODULE_DESCRIPTION("iMX SPI Contoller Driver"); | |
1763 | MODULE_LICENSE("GPL"); |