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44dab88e SF |
1 | /* |
2 | * SPI_PPC4XX SPI controller driver. | |
3 | * | |
4 | * Copyright (C) 2007 Gary Jennejohn <garyj@denx.de> | |
5 | * Copyright 2008 Stefan Roese <sr@denx.de>, DENX Software Engineering | |
6 | * Copyright 2009 Harris Corporation, Steven A. Falco <sfalco@harris.com> | |
7 | * | |
8 | * Based in part on drivers/spi/spi_s3c24xx.c | |
9 | * | |
10 | * Copyright (c) 2006 Ben Dooks | |
11 | * Copyright (c) 2006 Simtec Electronics | |
12 | * Ben Dooks <ben@simtec.co.uk> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify it | |
15 | * under the terms of the GNU General Public License version 2 as published | |
16 | * by the Free Software Foundation. | |
17 | */ | |
18 | ||
19 | /* | |
20 | * The PPC4xx SPI controller has no FIFO so each sent/received byte will | |
21 | * generate an interrupt to the CPU. This can cause high CPU utilization. | |
22 | * This driver allows platforms to reduce the interrupt load on the CPU | |
23 | * during SPI transfers by setting max_speed_hz via the device tree. | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/sched.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
44dab88e SF |
30 | #include <linux/errno.h> |
31 | #include <linux/wait.h> | |
32 | #include <linux/of_platform.h> | |
33 | #include <linux/of_spi.h> | |
34 | #include <linux/of_gpio.h> | |
35 | #include <linux/interrupt.h> | |
36 | #include <linux/delay.h> | |
37 | ||
38 | #include <linux/gpio.h> | |
39 | #include <linux/spi/spi.h> | |
40 | #include <linux/spi/spi_bitbang.h> | |
41 | ||
42 | #include <asm/io.h> | |
43 | #include <asm/dcr.h> | |
44 | #include <asm/dcr-regs.h> | |
45 | ||
46 | /* bits in mode register - bit 0 is MSb */ | |
47 | ||
48 | /* | |
49 | * SPI_PPC4XX_MODE_SCP = 0 means "data latched on trailing edge of clock" | |
50 | * SPI_PPC4XX_MODE_SCP = 1 means "data latched on leading edge of clock" | |
51 | * Note: This is the inverse of CPHA. | |
52 | */ | |
53 | #define SPI_PPC4XX_MODE_SCP (0x80 >> 3) | |
54 | ||
55 | /* SPI_PPC4XX_MODE_SPE = 1 means "port enabled" */ | |
56 | #define SPI_PPC4XX_MODE_SPE (0x80 >> 4) | |
57 | ||
58 | /* | |
59 | * SPI_PPC4XX_MODE_RD = 0 means "MSB first" - this is the normal mode | |
60 | * SPI_PPC4XX_MODE_RD = 1 means "LSB first" - this is bit-reversed mode | |
61 | * Note: This is identical to SPI_LSB_FIRST. | |
62 | */ | |
63 | #define SPI_PPC4XX_MODE_RD (0x80 >> 5) | |
64 | ||
65 | /* | |
66 | * SPI_PPC4XX_MODE_CI = 0 means "clock idles low" | |
67 | * SPI_PPC4XX_MODE_CI = 1 means "clock idles high" | |
68 | * Note: This is identical to CPOL. | |
69 | */ | |
70 | #define SPI_PPC4XX_MODE_CI (0x80 >> 6) | |
71 | ||
72 | /* | |
73 | * SPI_PPC4XX_MODE_IL = 0 means "loopback disable" | |
74 | * SPI_PPC4XX_MODE_IL = 1 means "loopback enable" | |
75 | */ | |
76 | #define SPI_PPC4XX_MODE_IL (0x80 >> 7) | |
77 | ||
78 | /* bits in control register */ | |
79 | /* starts a transfer when set */ | |
80 | #define SPI_PPC4XX_CR_STR (0x80 >> 7) | |
81 | ||
82 | /* bits in status register */ | |
83 | /* port is busy with a transfer */ | |
84 | #define SPI_PPC4XX_SR_BSY (0x80 >> 6) | |
85 | /* RxD ready */ | |
86 | #define SPI_PPC4XX_SR_RBR (0x80 >> 7) | |
87 | ||
88 | /* clock settings (SCP and CI) for various SPI modes */ | |
89 | #define SPI_CLK_MODE0 (SPI_PPC4XX_MODE_SCP | 0) | |
90 | #define SPI_CLK_MODE1 (0 | 0) | |
91 | #define SPI_CLK_MODE2 (SPI_PPC4XX_MODE_SCP | SPI_PPC4XX_MODE_CI) | |
92 | #define SPI_CLK_MODE3 (0 | SPI_PPC4XX_MODE_CI) | |
93 | ||
94 | #define DRIVER_NAME "spi_ppc4xx_of" | |
95 | ||
96 | struct spi_ppc4xx_regs { | |
97 | u8 mode; | |
98 | u8 rxd; | |
99 | u8 txd; | |
100 | u8 cr; | |
101 | u8 sr; | |
102 | u8 dummy; | |
103 | /* | |
104 | * Clock divisor modulus register | |
105 | * This uses the follwing formula: | |
106 | * SCPClkOut = OPBCLK/(4(CDM + 1)) | |
107 | * or | |
108 | * CDM = (OPBCLK/4*SCPClkOut) - 1 | |
109 | * bit 0 is the MSb! | |
110 | */ | |
111 | u8 cdm; | |
112 | }; | |
113 | ||
114 | /* SPI Controller driver's private data. */ | |
115 | struct ppc4xx_spi { | |
116 | /* bitbang has to be first */ | |
117 | struct spi_bitbang bitbang; | |
118 | struct completion done; | |
119 | ||
120 | u64 mapbase; | |
121 | u64 mapsize; | |
122 | int irqnum; | |
123 | /* need this to set the SPI clock */ | |
124 | unsigned int opb_freq; | |
125 | ||
126 | /* for transfers */ | |
127 | int len; | |
128 | int count; | |
129 | /* data buffers */ | |
130 | const unsigned char *tx; | |
131 | unsigned char *rx; | |
132 | ||
133 | int *gpios; | |
134 | ||
135 | struct spi_ppc4xx_regs __iomem *regs; /* pointer to the registers */ | |
136 | struct spi_master *master; | |
137 | struct device *dev; | |
138 | }; | |
139 | ||
140 | /* need this so we can set the clock in the chipselect routine */ | |
141 | struct spi_ppc4xx_cs { | |
142 | u8 mode; | |
143 | }; | |
144 | ||
145 | static int spi_ppc4xx_txrx(struct spi_device *spi, struct spi_transfer *t) | |
146 | { | |
147 | struct ppc4xx_spi *hw; | |
148 | u8 data; | |
149 | ||
150 | dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", | |
151 | t->tx_buf, t->rx_buf, t->len); | |
152 | ||
153 | hw = spi_master_get_devdata(spi->master); | |
154 | ||
155 | hw->tx = t->tx_buf; | |
156 | hw->rx = t->rx_buf; | |
157 | hw->len = t->len; | |
158 | hw->count = 0; | |
159 | ||
160 | /* send the first byte */ | |
161 | data = hw->tx ? hw->tx[0] : 0; | |
162 | out_8(&hw->regs->txd, data); | |
163 | out_8(&hw->regs->cr, SPI_PPC4XX_CR_STR); | |
164 | wait_for_completion(&hw->done); | |
165 | ||
166 | return hw->count; | |
167 | } | |
168 | ||
169 | static int spi_ppc4xx_setupxfer(struct spi_device *spi, struct spi_transfer *t) | |
170 | { | |
171 | struct ppc4xx_spi *hw = spi_master_get_devdata(spi->master); | |
172 | struct spi_ppc4xx_cs *cs = spi->controller_state; | |
173 | int scr; | |
174 | u8 cdm = 0; | |
175 | u32 speed; | |
176 | u8 bits_per_word; | |
177 | ||
178 | /* Start with the generic configuration for this device. */ | |
179 | bits_per_word = spi->bits_per_word; | |
180 | speed = spi->max_speed_hz; | |
181 | ||
182 | /* | |
183 | * Modify the configuration if the transfer overrides it. Do not allow | |
184 | * the transfer to overwrite the generic configuration with zeros. | |
185 | */ | |
186 | if (t) { | |
187 | if (t->bits_per_word) | |
188 | bits_per_word = t->bits_per_word; | |
189 | ||
190 | if (t->speed_hz) | |
191 | speed = min(t->speed_hz, spi->max_speed_hz); | |
192 | } | |
193 | ||
194 | if (bits_per_word != 8) { | |
195 | dev_err(&spi->dev, "invalid bits-per-word (%d)\n", | |
196 | bits_per_word); | |
197 | return -EINVAL; | |
198 | } | |
199 | ||
200 | if (!speed || (speed > spi->max_speed_hz)) { | |
201 | dev_err(&spi->dev, "invalid speed_hz (%d)\n", speed); | |
202 | return -EINVAL; | |
203 | } | |
204 | ||
205 | /* Write new configration */ | |
206 | out_8(&hw->regs->mode, cs->mode); | |
207 | ||
208 | /* Set the clock */ | |
209 | /* opb_freq was already divided by 4 */ | |
210 | scr = (hw->opb_freq / speed) - 1; | |
211 | if (scr > 0) | |
212 | cdm = min(scr, 0xff); | |
213 | ||
214 | dev_dbg(&spi->dev, "setting pre-scaler to %d (hz %d)\n", cdm, speed); | |
215 | ||
216 | if (in_8(&hw->regs->cdm) != cdm) | |
217 | out_8(&hw->regs->cdm, cdm); | |
218 | ||
219 | spin_lock(&hw->bitbang.lock); | |
220 | if (!hw->bitbang.busy) { | |
221 | hw->bitbang.chipselect(spi, BITBANG_CS_INACTIVE); | |
222 | /* Need to ndelay here? */ | |
223 | } | |
224 | spin_unlock(&hw->bitbang.lock); | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
229 | static int spi_ppc4xx_setup(struct spi_device *spi) | |
230 | { | |
231 | struct spi_ppc4xx_cs *cs = spi->controller_state; | |
232 | ||
233 | if (spi->bits_per_word != 8) { | |
234 | dev_err(&spi->dev, "invalid bits-per-word (%d)\n", | |
235 | spi->bits_per_word); | |
236 | return -EINVAL; | |
237 | } | |
238 | ||
239 | if (!spi->max_speed_hz) { | |
240 | dev_err(&spi->dev, "invalid max_speed_hz (must be non-zero)\n"); | |
241 | return -EINVAL; | |
242 | } | |
243 | ||
244 | if (cs == NULL) { | |
245 | cs = kzalloc(sizeof *cs, GFP_KERNEL); | |
246 | if (!cs) | |
247 | return -ENOMEM; | |
248 | spi->controller_state = cs; | |
249 | } | |
250 | ||
251 | /* | |
252 | * We set all bits of the SPI0_MODE register, so, | |
253 | * no need to read-modify-write | |
254 | */ | |
255 | cs->mode = SPI_PPC4XX_MODE_SPE; | |
256 | ||
257 | switch (spi->mode & (SPI_CPHA | SPI_CPOL)) { | |
258 | case SPI_MODE_0: | |
259 | cs->mode |= SPI_CLK_MODE0; | |
260 | break; | |
261 | case SPI_MODE_1: | |
262 | cs->mode |= SPI_CLK_MODE1; | |
263 | break; | |
264 | case SPI_MODE_2: | |
265 | cs->mode |= SPI_CLK_MODE2; | |
266 | break; | |
267 | case SPI_MODE_3: | |
268 | cs->mode |= SPI_CLK_MODE3; | |
269 | break; | |
270 | } | |
271 | ||
272 | if (spi->mode & SPI_LSB_FIRST) | |
273 | cs->mode |= SPI_PPC4XX_MODE_RD; | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | static void spi_ppc4xx_chipsel(struct spi_device *spi, int value) | |
279 | { | |
280 | struct ppc4xx_spi *hw = spi_master_get_devdata(spi->master); | |
281 | unsigned int cs = spi->chip_select; | |
282 | unsigned int cspol; | |
283 | ||
284 | /* | |
285 | * If there are no chip selects at all, or if this is the special | |
286 | * case of a non-existent (dummy) chip select, do nothing. | |
287 | */ | |
288 | ||
289 | if (!hw->master->num_chipselect || hw->gpios[cs] == -EEXIST) | |
290 | return; | |
291 | ||
292 | cspol = spi->mode & SPI_CS_HIGH ? 1 : 0; | |
293 | if (value == BITBANG_CS_INACTIVE) | |
294 | cspol = !cspol; | |
295 | ||
296 | gpio_set_value(hw->gpios[cs], cspol); | |
297 | } | |
298 | ||
299 | static irqreturn_t spi_ppc4xx_int(int irq, void *dev_id) | |
300 | { | |
301 | struct ppc4xx_spi *hw; | |
302 | u8 status; | |
303 | u8 data; | |
304 | unsigned int count; | |
305 | ||
306 | hw = (struct ppc4xx_spi *)dev_id; | |
307 | ||
308 | status = in_8(&hw->regs->sr); | |
309 | if (!status) | |
310 | return IRQ_NONE; | |
311 | ||
312 | /* | |
313 | * BSY de-asserts one cycle after the transfer is complete. The | |
314 | * interrupt is asserted after the transfer is complete. The exact | |
315 | * relationship is not documented, hence this code. | |
316 | */ | |
317 | ||
318 | if (unlikely(status & SPI_PPC4XX_SR_BSY)) { | |
319 | u8 lstatus; | |
320 | int cnt = 0; | |
321 | ||
322 | dev_dbg(hw->dev, "got interrupt but spi still busy?\n"); | |
323 | do { | |
324 | ndelay(10); | |
325 | lstatus = in_8(&hw->regs->sr); | |
326 | } while (++cnt < 100 && lstatus & SPI_PPC4XX_SR_BSY); | |
327 | ||
328 | if (cnt >= 100) { | |
329 | dev_err(hw->dev, "busywait: too many loops!\n"); | |
330 | complete(&hw->done); | |
331 | return IRQ_HANDLED; | |
332 | } else { | |
333 | /* status is always 1 (RBR) here */ | |
334 | status = in_8(&hw->regs->sr); | |
335 | dev_dbg(hw->dev, "loops %d status %x\n", cnt, status); | |
336 | } | |
337 | } | |
338 | ||
339 | count = hw->count; | |
340 | hw->count++; | |
341 | ||
342 | /* RBR triggered this interrupt. Therefore, data must be ready. */ | |
343 | data = in_8(&hw->regs->rxd); | |
344 | if (hw->rx) | |
345 | hw->rx[count] = data; | |
346 | ||
347 | count++; | |
348 | ||
349 | if (count < hw->len) { | |
350 | data = hw->tx ? hw->tx[count] : 0; | |
351 | out_8(&hw->regs->txd, data); | |
352 | out_8(&hw->regs->cr, SPI_PPC4XX_CR_STR); | |
353 | } else { | |
354 | complete(&hw->done); | |
355 | } | |
356 | ||
357 | return IRQ_HANDLED; | |
358 | } | |
359 | ||
360 | static void spi_ppc4xx_cleanup(struct spi_device *spi) | |
361 | { | |
362 | kfree(spi->controller_state); | |
363 | } | |
364 | ||
365 | static void spi_ppc4xx_enable(struct ppc4xx_spi *hw) | |
366 | { | |
367 | /* | |
368 | * On all 4xx PPC's the SPI bus is shared/multiplexed with | |
369 | * the 2nd I2C bus. We need to enable the the SPI bus before | |
370 | * using it. | |
371 | */ | |
372 | ||
373 | /* need to clear bit 14 to enable SPC */ | |
374 | dcri_clrset(SDR0, SDR0_PFC1, 0x80000000 >> 14, 0); | |
375 | } | |
376 | ||
377 | static void free_gpios(struct ppc4xx_spi *hw) | |
378 | { | |
379 | if (hw->master->num_chipselect) { | |
380 | int i; | |
381 | for (i = 0; i < hw->master->num_chipselect; i++) | |
382 | if (gpio_is_valid(hw->gpios[i])) | |
383 | gpio_free(hw->gpios[i]); | |
384 | ||
385 | kfree(hw->gpios); | |
386 | hw->gpios = NULL; | |
387 | } | |
388 | } | |
389 | ||
390 | /* | |
2dc11581 | 391 | * platform_device layer stuff... |
44dab88e | 392 | */ |
18d306d1 | 393 | static int __init spi_ppc4xx_of_probe(struct platform_device *op) |
44dab88e SF |
394 | { |
395 | struct ppc4xx_spi *hw; | |
396 | struct spi_master *master; | |
397 | struct spi_bitbang *bbp; | |
398 | struct resource resource; | |
b5355078 | 399 | struct device_node *np = op->dev.of_node; |
44dab88e SF |
400 | struct device *dev = &op->dev; |
401 | struct device_node *opbnp; | |
402 | int ret; | |
403 | int num_gpios; | |
404 | const unsigned int *clk; | |
405 | ||
406 | master = spi_alloc_master(dev, sizeof *hw); | |
407 | if (master == NULL) | |
408 | return -ENOMEM; | |
12b15e83 | 409 | master->dev.of_node = np; |
44dab88e SF |
410 | dev_set_drvdata(dev, master); |
411 | hw = spi_master_get_devdata(master); | |
412 | hw->master = spi_master_get(master); | |
413 | hw->dev = dev; | |
414 | ||
415 | init_completion(&hw->done); | |
416 | ||
417 | /* | |
418 | * A count of zero implies a single SPI device without any chip-select. | |
419 | * Note that of_gpio_count counts all gpios assigned to this spi master. | |
420 | * This includes both "null" gpio's and real ones. | |
421 | */ | |
422 | num_gpios = of_gpio_count(np); | |
423 | if (num_gpios) { | |
424 | int i; | |
425 | ||
426 | hw->gpios = kzalloc(sizeof(int) * num_gpios, GFP_KERNEL); | |
427 | if (!hw->gpios) { | |
428 | ret = -ENOMEM; | |
429 | goto free_master; | |
430 | } | |
431 | ||
432 | for (i = 0; i < num_gpios; i++) { | |
433 | int gpio; | |
434 | enum of_gpio_flags flags; | |
435 | ||
436 | gpio = of_get_gpio_flags(np, i, &flags); | |
437 | hw->gpios[i] = gpio; | |
438 | ||
439 | if (gpio_is_valid(gpio)) { | |
440 | /* Real CS - set the initial state. */ | |
441 | ret = gpio_request(gpio, np->name); | |
442 | if (ret < 0) { | |
443 | dev_err(dev, "can't request gpio " | |
444 | "#%d: %d\n", i, ret); | |
445 | goto free_gpios; | |
446 | } | |
447 | ||
448 | gpio_direction_output(gpio, | |
449 | !!(flags & OF_GPIO_ACTIVE_LOW)); | |
450 | } else if (gpio == -EEXIST) { | |
451 | ; /* No CS, but that's OK. */ | |
452 | } else { | |
453 | dev_err(dev, "invalid gpio #%d: %d\n", i, gpio); | |
454 | ret = -EINVAL; | |
455 | goto free_gpios; | |
456 | } | |
457 | } | |
458 | } | |
459 | ||
460 | /* Setup the state for the bitbang driver */ | |
461 | bbp = &hw->bitbang; | |
462 | bbp->master = hw->master; | |
463 | bbp->setup_transfer = spi_ppc4xx_setupxfer; | |
464 | bbp->chipselect = spi_ppc4xx_chipsel; | |
465 | bbp->txrx_bufs = spi_ppc4xx_txrx; | |
466 | bbp->use_dma = 0; | |
467 | bbp->master->setup = spi_ppc4xx_setup; | |
468 | bbp->master->cleanup = spi_ppc4xx_cleanup; | |
469 | ||
470 | /* Allocate bus num dynamically. */ | |
471 | bbp->master->bus_num = -1; | |
472 | ||
473 | /* the spi->mode bits understood by this driver: */ | |
474 | bbp->master->mode_bits = | |
475 | SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LSB_FIRST; | |
476 | ||
477 | /* this many pins in all GPIO controllers */ | |
478 | bbp->master->num_chipselect = num_gpios; | |
479 | ||
480 | /* Get the clock for the OPB */ | |
481 | opbnp = of_find_compatible_node(NULL, NULL, "ibm,opb"); | |
482 | if (opbnp == NULL) { | |
483 | dev_err(dev, "OPB: cannot find node\n"); | |
484 | ret = -ENODEV; | |
485 | goto free_gpios; | |
486 | } | |
487 | /* Get the clock (Hz) for the OPB */ | |
488 | clk = of_get_property(opbnp, "clock-frequency", NULL); | |
489 | if (clk == NULL) { | |
490 | dev_err(dev, "OPB: no clock-frequency property set\n"); | |
491 | of_node_put(opbnp); | |
492 | ret = -ENODEV; | |
493 | goto free_gpios; | |
494 | } | |
495 | hw->opb_freq = *clk; | |
496 | hw->opb_freq >>= 2; | |
497 | of_node_put(opbnp); | |
498 | ||
499 | ret = of_address_to_resource(np, 0, &resource); | |
500 | if (ret) { | |
501 | dev_err(dev, "error while parsing device node resource\n"); | |
502 | goto free_gpios; | |
503 | } | |
504 | hw->mapbase = resource.start; | |
505 | hw->mapsize = resource.end - resource.start + 1; | |
506 | ||
507 | /* Sanity check */ | |
508 | if (hw->mapsize < sizeof(struct spi_ppc4xx_regs)) { | |
509 | dev_err(dev, "too small to map registers\n"); | |
510 | ret = -EINVAL; | |
511 | goto free_gpios; | |
512 | } | |
513 | ||
514 | /* Request IRQ */ | |
515 | hw->irqnum = irq_of_parse_and_map(np, 0); | |
516 | ret = request_irq(hw->irqnum, spi_ppc4xx_int, | |
517 | IRQF_DISABLED, "spi_ppc4xx_of", (void *)hw); | |
518 | if (ret) { | |
519 | dev_err(dev, "unable to allocate interrupt\n"); | |
520 | goto free_gpios; | |
521 | } | |
522 | ||
523 | if (!request_mem_region(hw->mapbase, hw->mapsize, DRIVER_NAME)) { | |
524 | dev_err(dev, "resource unavailable\n"); | |
525 | ret = -EBUSY; | |
526 | goto request_mem_error; | |
527 | } | |
528 | ||
529 | hw->regs = ioremap(hw->mapbase, sizeof(struct spi_ppc4xx_regs)); | |
530 | ||
531 | if (!hw->regs) { | |
532 | dev_err(dev, "unable to memory map registers\n"); | |
533 | ret = -ENXIO; | |
534 | goto map_io_error; | |
535 | } | |
536 | ||
537 | spi_ppc4xx_enable(hw); | |
538 | ||
539 | /* Finally register our spi controller */ | |
540 | dev->dma_mask = 0; | |
541 | ret = spi_bitbang_start(bbp); | |
542 | if (ret) { | |
543 | dev_err(dev, "failed to register SPI master\n"); | |
544 | goto unmap_regs; | |
545 | } | |
546 | ||
547 | dev_info(dev, "driver initialized\n"); | |
44dab88e SF |
548 | |
549 | return 0; | |
550 | ||
551 | unmap_regs: | |
552 | iounmap(hw->regs); | |
553 | map_io_error: | |
554 | release_mem_region(hw->mapbase, hw->mapsize); | |
555 | request_mem_error: | |
556 | free_irq(hw->irqnum, hw); | |
557 | free_gpios: | |
558 | free_gpios(hw); | |
559 | free_master: | |
560 | dev_set_drvdata(dev, NULL); | |
561 | spi_master_put(master); | |
562 | ||
563 | dev_err(dev, "initialization failed\n"); | |
564 | return ret; | |
565 | } | |
566 | ||
2dc11581 | 567 | static int __exit spi_ppc4xx_of_remove(struct platform_device *op) |
44dab88e SF |
568 | { |
569 | struct spi_master *master = dev_get_drvdata(&op->dev); | |
570 | struct ppc4xx_spi *hw = spi_master_get_devdata(master); | |
571 | ||
572 | spi_bitbang_stop(&hw->bitbang); | |
573 | dev_set_drvdata(&op->dev, NULL); | |
574 | release_mem_region(hw->mapbase, hw->mapsize); | |
575 | free_irq(hw->irqnum, hw); | |
576 | iounmap(hw->regs); | |
577 | free_gpios(hw); | |
578 | return 0; | |
579 | } | |
580 | ||
631e61b7 | 581 | static const struct of_device_id spi_ppc4xx_of_match[] = { |
44dab88e SF |
582 | { .compatible = "ibm,ppc4xx-spi", }, |
583 | {}, | |
584 | }; | |
585 | ||
586 | MODULE_DEVICE_TABLE(of, spi_ppc4xx_of_match); | |
587 | ||
18d306d1 | 588 | static struct platform_driver spi_ppc4xx_of_driver = { |
44dab88e SF |
589 | .probe = spi_ppc4xx_of_probe, |
590 | .remove = __exit_p(spi_ppc4xx_of_remove), | |
591 | .driver = { | |
592 | .name = DRIVER_NAME, | |
593 | .owner = THIS_MODULE, | |
4018294b | 594 | .of_match_table = spi_ppc4xx_of_match, |
44dab88e SF |
595 | }, |
596 | }; | |
597 | ||
598 | static int __init spi_ppc4xx_init(void) | |
599 | { | |
18d306d1 | 600 | return platform_driver_register(&spi_ppc4xx_of_driver); |
44dab88e SF |
601 | } |
602 | module_init(spi_ppc4xx_init); | |
603 | ||
604 | static void __exit spi_ppc4xx_exit(void) | |
605 | { | |
18d306d1 | 606 | platform_driver_unregister(&spi_ppc4xx_of_driver); |
44dab88e SF |
607 | } |
608 | module_exit(spi_ppc4xx_exit); | |
609 | ||
610 | MODULE_AUTHOR("Gary Jennejohn & Stefan Roese"); | |
611 | MODULE_DESCRIPTION("Simple PPC4xx SPI Driver"); | |
612 | MODULE_LICENSE("GPL"); |