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6e27388f AG |
1 | /* |
2 | * MPC512x PSC in SPI mode driver. | |
3 | * | |
4 | * Copyright (C) 2007,2008 Freescale Semiconductor Inc. | |
5 | * Original port from 52xx driver: | |
6 | * Hongjun Chen <hong-jun.chen@freescale.com> | |
7 | * | |
8 | * Fork of mpc52xx_psc_spi.c: | |
9 | * Copyright (C) 2006 TOPTICA Photonics AG., Dragos Carp | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/interrupt.h> | |
22ae782f | 22 | #include <linux/of_address.h> |
6e27388f | 23 | #include <linux/of_platform.h> |
6e27388f AG |
24 | #include <linux/completion.h> |
25 | #include <linux/io.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/clk.h> | |
28 | #include <linux/spi/spi.h> | |
29 | #include <linux/fsl_devices.h> | |
86e98743 | 30 | #include <linux/gpio.h> |
6e27388f AG |
31 | #include <asm/mpc52xx_psc.h> |
32 | ||
33 | struct mpc512x_psc_spi { | |
34 | void (*cs_control)(struct spi_device *spi, bool on); | |
6e27388f AG |
35 | |
36 | /* driver internal data */ | |
37 | struct mpc52xx_psc __iomem *psc; | |
38 | struct mpc512x_psc_fifo __iomem *fifo; | |
39 | unsigned int irq; | |
40 | u8 bits_per_word; | |
a81a5094 GS |
41 | struct clk *clk_mclk; |
42 | u32 mclk_rate; | |
6e27388f | 43 | |
c36e93a0 | 44 | struct completion txisrdone; |
6e27388f AG |
45 | }; |
46 | ||
47 | /* controller state */ | |
48 | struct mpc512x_psc_spi_cs { | |
49 | int bits_per_word; | |
50 | int speed_hz; | |
51 | }; | |
52 | ||
53 | /* set clock freq, clock ramp, bits per work | |
54 | * if t is NULL then reset the values to the default values | |
55 | */ | |
56 | static int mpc512x_psc_spi_transfer_setup(struct spi_device *spi, | |
57 | struct spi_transfer *t) | |
58 | { | |
59 | struct mpc512x_psc_spi_cs *cs = spi->controller_state; | |
60 | ||
61 | cs->speed_hz = (t && t->speed_hz) | |
62 | ? t->speed_hz : spi->max_speed_hz; | |
63 | cs->bits_per_word = (t && t->bits_per_word) | |
64 | ? t->bits_per_word : spi->bits_per_word; | |
65 | cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8; | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static void mpc512x_psc_spi_activate_cs(struct spi_device *spi) | |
70 | { | |
71 | struct mpc512x_psc_spi_cs *cs = spi->controller_state; | |
72 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); | |
73 | struct mpc52xx_psc __iomem *psc = mps->psc; | |
74 | u32 sicr; | |
75 | u32 ccr; | |
a81a5094 | 76 | int speed; |
6e27388f AG |
77 | u16 bclkdiv; |
78 | ||
79 | sicr = in_be32(&psc->sicr); | |
80 | ||
81 | /* Set clock phase and polarity */ | |
82 | if (spi->mode & SPI_CPHA) | |
83 | sicr |= 0x00001000; | |
84 | else | |
85 | sicr &= ~0x00001000; | |
86 | ||
87 | if (spi->mode & SPI_CPOL) | |
88 | sicr |= 0x00002000; | |
89 | else | |
90 | sicr &= ~0x00002000; | |
91 | ||
92 | if (spi->mode & SPI_LSB_FIRST) | |
93 | sicr |= 0x10000000; | |
94 | else | |
95 | sicr &= ~0x10000000; | |
96 | out_be32(&psc->sicr, sicr); | |
97 | ||
98 | ccr = in_be32(&psc->ccr); | |
99 | ccr &= 0xFF000000; | |
a81a5094 GS |
100 | speed = cs->speed_hz; |
101 | if (!speed) | |
102 | speed = 1000000; /* default 1MHz */ | |
103 | bclkdiv = (mps->mclk_rate / speed) - 1; | |
6e27388f AG |
104 | |
105 | ccr |= (((bclkdiv & 0xff) << 16) | (((bclkdiv >> 8) & 0xff) << 8)); | |
106 | out_be32(&psc->ccr, ccr); | |
107 | mps->bits_per_word = cs->bits_per_word; | |
108 | ||
86e98743 | 109 | if (mps->cs_control && gpio_is_valid(spi->cs_gpio)) |
6e27388f AG |
110 | mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0); |
111 | } | |
112 | ||
113 | static void mpc512x_psc_spi_deactivate_cs(struct spi_device *spi) | |
114 | { | |
115 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); | |
116 | ||
86e98743 | 117 | if (mps->cs_control && gpio_is_valid(spi->cs_gpio)) |
6e27388f AG |
118 | mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1); |
119 | ||
120 | } | |
121 | ||
122 | /* extract and scale size field in txsz or rxsz */ | |
123 | #define MPC512x_PSC_FIFO_SZ(sz) ((sz & 0x7ff) << 2); | |
124 | ||
125 | #define EOFBYTE 1 | |
126 | ||
127 | static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi, | |
128 | struct spi_transfer *t) | |
129 | { | |
130 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); | |
6e27388f | 131 | struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; |
c36e93a0 | 132 | size_t tx_len = t->len; |
5df24ea6 | 133 | size_t rx_len = t->len; |
6e27388f AG |
134 | u8 *tx_buf = (u8 *)t->tx_buf; |
135 | u8 *rx_buf = (u8 *)t->rx_buf; | |
136 | ||
137 | if (!tx_buf && !rx_buf && t->len) | |
138 | return -EINVAL; | |
139 | ||
5df24ea6 | 140 | while (rx_len || tx_len) { |
c36e93a0 | 141 | size_t txcount; |
6e27388f AG |
142 | u8 data; |
143 | size_t fifosz; | |
c36e93a0 | 144 | size_t rxcount; |
5df24ea6 | 145 | int rxtries; |
6e27388f AG |
146 | |
147 | /* | |
5df24ea6 GS |
148 | * send the TX bytes in as large a chunk as possible |
149 | * but neither exceed the TX nor the RX FIFOs | |
6e27388f AG |
150 | */ |
151 | fifosz = MPC512x_PSC_FIFO_SZ(in_be32(&fifo->txsz)); | |
c36e93a0 | 152 | txcount = min(fifosz, tx_len); |
5df24ea6 GS |
153 | fifosz = MPC512x_PSC_FIFO_SZ(in_be32(&fifo->rxsz)); |
154 | fifosz -= in_be32(&fifo->rxcnt) + 1; | |
155 | txcount = min(fifosz, txcount); | |
156 | if (txcount) { | |
157 | ||
158 | /* fill the TX FIFO */ | |
159 | while (txcount-- > 0) { | |
160 | data = tx_buf ? *tx_buf++ : 0; | |
161 | if (tx_len == EOFBYTE && t->cs_change) | |
162 | setbits32(&fifo->txcmd, | |
163 | MPC512x_PSC_FIFO_EOF); | |
164 | out_8(&fifo->txdata_8, data); | |
165 | tx_len--; | |
166 | } | |
6e27388f | 167 | |
5df24ea6 GS |
168 | /* have the ISR trigger when the TX FIFO is empty */ |
169 | INIT_COMPLETION(mps->txisrdone); | |
170 | out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY); | |
171 | out_be32(&fifo->tximr, MPC512x_PSC_FIFO_EMPTY); | |
172 | wait_for_completion(&mps->txisrdone); | |
6e27388f AG |
173 | } |
174 | ||
5df24ea6 GS |
175 | /* |
176 | * consume as much RX data as the FIFO holds, while we | |
177 | * iterate over the transfer's TX data length | |
178 | * | |
179 | * only insist in draining all the remaining RX bytes | |
180 | * when the TX bytes were exhausted (that's at the very | |
181 | * end of this transfer, not when still iterating over | |
182 | * the transfer's chunks) | |
183 | */ | |
184 | rxtries = 50; | |
185 | do { | |
186 | ||
187 | /* | |
188 | * grab whatever was in the FIFO when we started | |
189 | * looking, don't bother fetching what was added to | |
190 | * the FIFO while we read from it -- we'll return | |
191 | * here eventually and prefer sending out remaining | |
192 | * TX data | |
193 | */ | |
194 | fifosz = in_be32(&fifo->rxcnt); | |
195 | rxcount = min(fifosz, rx_len); | |
196 | while (rxcount-- > 0) { | |
197 | data = in_8(&fifo->rxdata_8); | |
198 | if (rx_buf) | |
199 | *rx_buf++ = data; | |
200 | rx_len--; | |
201 | } | |
6e27388f | 202 | |
5df24ea6 GS |
203 | /* |
204 | * come back later if there still is TX data to send, | |
205 | * bail out of the RX drain loop if all of the TX data | |
206 | * was sent and all of the RX data was received (i.e. | |
207 | * when the transmission has completed) | |
208 | */ | |
209 | if (tx_len) | |
210 | break; | |
211 | if (!rx_len) | |
212 | break; | |
213 | ||
214 | /* | |
215 | * TX data transmission has completed while RX data | |
216 | * is still pending -- that's a transient situation | |
217 | * which depends on wire speed and specific | |
218 | * hardware implementation details (buffering) yet | |
219 | * should resolve very quickly | |
220 | * | |
221 | * just yield for a moment to not hog the CPU for | |
222 | * too long when running SPI at low speed | |
223 | * | |
224 | * the timeout range is rather arbitrary and tries | |
225 | * to balance throughput against system load; the | |
226 | * chosen values result in a minimal timeout of 50 | |
227 | * times 10us and thus work at speeds as low as | |
228 | * some 20kbps, while the maximum timeout at the | |
229 | * transfer's end could be 5ms _if_ nothing else | |
230 | * ticks in the system _and_ RX data still wasn't | |
231 | * received, which only occurs in situations that | |
232 | * are exceptional; removing the unpredictability | |
233 | * of the timeout either decreases throughput | |
234 | * (longer timeouts), or puts more load on the | |
235 | * system (fixed short timeouts) or requires the | |
236 | * use of a timeout API instead of a counter and an | |
237 | * unknown inner delay | |
238 | */ | |
239 | usleep_range(10, 100); | |
240 | ||
241 | } while (--rxtries > 0); | |
242 | if (!tx_len && rx_len && !rxtries) { | |
243 | /* | |
244 | * not enough RX bytes even after several retries | |
245 | * and the resulting rather long timeout? | |
246 | */ | |
247 | rxcount = in_be32(&fifo->rxcnt); | |
248 | dev_warn(&spi->dev, | |
249 | "short xfer, missing %zd RX bytes, FIFO level %zd\n", | |
250 | rx_len, rxcount); | |
6e27388f AG |
251 | } |
252 | ||
5df24ea6 GS |
253 | /* |
254 | * drain and drop RX data which "should not be there" in | |
255 | * the first place, for undisturbed transmission this turns | |
256 | * into a NOP (except for the FIFO level fetch) | |
257 | */ | |
258 | if (!tx_len && !rx_len) { | |
259 | while (in_be32(&fifo->rxcnt)) | |
260 | in_8(&fifo->rxdata_8); | |
6e27388f | 261 | } |
5df24ea6 | 262 | |
6e27388f | 263 | } |
6e27388f AG |
264 | return 0; |
265 | } | |
266 | ||
85085898 GS |
267 | static int mpc512x_psc_spi_msg_xfer(struct spi_master *master, |
268 | struct spi_message *m) | |
6e27388f | 269 | { |
85085898 GS |
270 | struct spi_device *spi; |
271 | unsigned cs_change; | |
272 | int status; | |
273 | struct spi_transfer *t; | |
274 | ||
275 | spi = m->spi; | |
276 | cs_change = 1; | |
277 | status = 0; | |
278 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
279 | if (t->bits_per_word || t->speed_hz) { | |
280 | status = mpc512x_psc_spi_transfer_setup(spi, t); | |
281 | if (status < 0) | |
6e27388f | 282 | break; |
85085898 | 283 | } |
6e27388f | 284 | |
85085898 GS |
285 | if (cs_change) |
286 | mpc512x_psc_spi_activate_cs(spi); | |
287 | cs_change = t->cs_change; | |
6e27388f | 288 | |
85085898 GS |
289 | status = mpc512x_psc_spi_transfer_rxtx(spi, t); |
290 | if (status) | |
291 | break; | |
292 | m->actual_length += t->len; | |
6e27388f | 293 | |
85085898 GS |
294 | if (t->delay_usecs) |
295 | udelay(t->delay_usecs); | |
6e27388f | 296 | |
85085898 | 297 | if (cs_change) |
6e27388f | 298 | mpc512x_psc_spi_deactivate_cs(spi); |
85085898 | 299 | } |
6e27388f | 300 | |
85085898 GS |
301 | m->status = status; |
302 | m->complete(m->context); | |
6e27388f | 303 | |
85085898 GS |
304 | if (status || !cs_change) |
305 | mpc512x_psc_spi_deactivate_cs(spi); | |
306 | ||
307 | mpc512x_psc_spi_transfer_setup(spi, NULL); | |
308 | ||
309 | spi_finalize_current_message(master); | |
310 | return status; | |
311 | } | |
312 | ||
313 | static int mpc512x_psc_spi_prep_xfer_hw(struct spi_master *master) | |
314 | { | |
315 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(master); | |
316 | struct mpc52xx_psc __iomem *psc = mps->psc; | |
317 | ||
318 | dev_dbg(&master->dev, "%s()\n", __func__); | |
319 | ||
320 | /* Zero MR2 */ | |
321 | in_8(&psc->mode); | |
322 | out_8(&psc->mode, 0x0); | |
323 | ||
324 | /* enable transmitter/receiver */ | |
325 | out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
330 | static int mpc512x_psc_spi_unprep_xfer_hw(struct spi_master *master) | |
331 | { | |
332 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(master); | |
333 | struct mpc52xx_psc __iomem *psc = mps->psc; | |
334 | struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; | |
335 | ||
336 | dev_dbg(&master->dev, "%s()\n", __func__); | |
337 | ||
338 | /* disable transmitter/receiver and fifo interrupt */ | |
339 | out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE); | |
340 | out_be32(&fifo->tximr, 0); | |
341 | ||
342 | return 0; | |
6e27388f AG |
343 | } |
344 | ||
345 | static int mpc512x_psc_spi_setup(struct spi_device *spi) | |
346 | { | |
6e27388f | 347 | struct mpc512x_psc_spi_cs *cs = spi->controller_state; |
86e98743 | 348 | int ret; |
6e27388f AG |
349 | |
350 | if (spi->bits_per_word % 8) | |
351 | return -EINVAL; | |
352 | ||
353 | if (!cs) { | |
354 | cs = kzalloc(sizeof *cs, GFP_KERNEL); | |
355 | if (!cs) | |
356 | return -ENOMEM; | |
86e98743 AG |
357 | |
358 | if (gpio_is_valid(spi->cs_gpio)) { | |
359 | ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev)); | |
360 | if (ret) { | |
361 | dev_err(&spi->dev, "can't get CS gpio: %d\n", | |
362 | ret); | |
363 | kfree(cs); | |
364 | return ret; | |
365 | } | |
366 | gpio_direction_output(spi->cs_gpio, | |
367 | spi->mode & SPI_CS_HIGH ? 0 : 1); | |
368 | } | |
369 | ||
6e27388f AG |
370 | spi->controller_state = cs; |
371 | } | |
372 | ||
373 | cs->bits_per_word = spi->bits_per_word; | |
374 | cs->speed_hz = spi->max_speed_hz; | |
375 | ||
6e27388f AG |
376 | return 0; |
377 | } | |
378 | ||
379 | static void mpc512x_psc_spi_cleanup(struct spi_device *spi) | |
380 | { | |
86e98743 AG |
381 | if (gpio_is_valid(spi->cs_gpio)) |
382 | gpio_free(spi->cs_gpio); | |
6e27388f AG |
383 | kfree(spi->controller_state); |
384 | } | |
385 | ||
386 | static int mpc512x_psc_spi_port_config(struct spi_master *master, | |
387 | struct mpc512x_psc_spi *mps) | |
388 | { | |
389 | struct mpc52xx_psc __iomem *psc = mps->psc; | |
390 | struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; | |
6e27388f AG |
391 | u32 sicr; |
392 | u32 ccr; | |
a81a5094 | 393 | int speed; |
6e27388f AG |
394 | u16 bclkdiv; |
395 | ||
6e27388f AG |
396 | /* Reset the PSC into a known state */ |
397 | out_8(&psc->command, MPC52xx_PSC_RST_RX); | |
398 | out_8(&psc->command, MPC52xx_PSC_RST_TX); | |
399 | out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE); | |
400 | ||
401 | /* Disable psc interrupts all useful interrupts are in fifo */ | |
402 | out_be16(&psc->isr_imr.imr, 0); | |
403 | ||
404 | /* Disable fifo interrupts, will be enabled later */ | |
405 | out_be32(&fifo->tximr, 0); | |
406 | out_be32(&fifo->rximr, 0); | |
407 | ||
408 | /* Setup fifo slice address and size */ | |
409 | /*out_be32(&fifo->txsz, 0x0fe00004);*/ | |
410 | /*out_be32(&fifo->rxsz, 0x0ff00004);*/ | |
411 | ||
412 | sicr = 0x01000000 | /* SIM = 0001 -- 8 bit */ | |
413 | 0x00800000 | /* GenClk = 1 -- internal clk */ | |
414 | 0x00008000 | /* SPI = 1 */ | |
415 | 0x00004000 | /* MSTR = 1 -- SPI master */ | |
416 | 0x00000800; /* UseEOF = 1 -- SS low until EOF */ | |
417 | ||
418 | out_be32(&psc->sicr, sicr); | |
419 | ||
420 | ccr = in_be32(&psc->ccr); | |
421 | ccr &= 0xFF000000; | |
a81a5094 GS |
422 | speed = 1000000; /* default 1MHz */ |
423 | bclkdiv = (mps->mclk_rate / speed) - 1; | |
6e27388f AG |
424 | ccr |= (((bclkdiv & 0xff) << 16) | (((bclkdiv >> 8) & 0xff) << 8)); |
425 | out_be32(&psc->ccr, ccr); | |
426 | ||
427 | /* Set 2ms DTL delay */ | |
428 | out_8(&psc->ctur, 0x00); | |
429 | out_8(&psc->ctlr, 0x82); | |
430 | ||
431 | /* we don't use the alarms */ | |
432 | out_be32(&fifo->rxalarm, 0xfff); | |
433 | out_be32(&fifo->txalarm, 0); | |
434 | ||
435 | /* Enable FIFO slices for Rx/Tx */ | |
436 | out_be32(&fifo->rxcmd, | |
437 | MPC512x_PSC_FIFO_ENABLE_SLICE | MPC512x_PSC_FIFO_ENABLE_DMA); | |
438 | out_be32(&fifo->txcmd, | |
439 | MPC512x_PSC_FIFO_ENABLE_SLICE | MPC512x_PSC_FIFO_ENABLE_DMA); | |
440 | ||
441 | mps->bits_per_word = 8; | |
442 | ||
a81a5094 | 443 | return 0; |
6e27388f AG |
444 | } |
445 | ||
446 | static irqreturn_t mpc512x_psc_spi_isr(int irq, void *dev_id) | |
447 | { | |
448 | struct mpc512x_psc_spi *mps = (struct mpc512x_psc_spi *)dev_id; | |
449 | struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; | |
450 | ||
85085898 | 451 | /* clear interrupt and wake up the rx/tx routine */ |
6e27388f AG |
452 | if (in_be32(&fifo->txisr) & |
453 | in_be32(&fifo->tximr) & MPC512x_PSC_FIFO_EMPTY) { | |
454 | out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY); | |
455 | out_be32(&fifo->tximr, 0); | |
c36e93a0 | 456 | complete(&mps->txisrdone); |
6e27388f AG |
457 | return IRQ_HANDLED; |
458 | } | |
459 | return IRQ_NONE; | |
460 | } | |
461 | ||
86e98743 AG |
462 | static void mpc512x_spi_cs_control(struct spi_device *spi, bool onoff) |
463 | { | |
464 | gpio_set_value(spi->cs_gpio, onoff); | |
465 | } | |
466 | ||
6e27388f | 467 | /* bus_num is used only for the case dev->platform_data == NULL */ |
fd4a319b | 468 | static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr, |
cf40f082 AG |
469 | u32 size, unsigned int irq, |
470 | s16 bus_num) | |
6e27388f | 471 | { |
8074cf06 | 472 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); |
6e27388f AG |
473 | struct mpc512x_psc_spi *mps; |
474 | struct spi_master *master; | |
475 | int ret; | |
476 | void *tempp; | |
a81a5094 GS |
477 | int psc_num; |
478 | char clk_name[16]; | |
479 | struct clk *clk; | |
6e27388f AG |
480 | |
481 | master = spi_alloc_master(dev, sizeof *mps); | |
482 | if (master == NULL) | |
483 | return -ENOMEM; | |
484 | ||
485 | dev_set_drvdata(dev, master); | |
486 | mps = spi_master_get_devdata(master); | |
487 | mps->irq = irq; | |
488 | ||
489 | if (pdata == NULL) { | |
86e98743 | 490 | mps->cs_control = mpc512x_spi_cs_control; |
6e27388f | 491 | master->bus_num = bus_num; |
6e27388f AG |
492 | } else { |
493 | mps->cs_control = pdata->cs_control; | |
6e27388f AG |
494 | master->bus_num = pdata->bus_num; |
495 | master->num_chipselect = pdata->max_chipselect; | |
496 | } | |
497 | ||
c88dd349 | 498 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST; |
6e27388f | 499 | master->setup = mpc512x_psc_spi_setup; |
85085898 GS |
500 | master->prepare_transfer_hardware = mpc512x_psc_spi_prep_xfer_hw; |
501 | master->transfer_one_message = mpc512x_psc_spi_msg_xfer; | |
502 | master->unprepare_transfer_hardware = mpc512x_psc_spi_unprep_xfer_hw; | |
6e27388f | 503 | master->cleanup = mpc512x_psc_spi_cleanup; |
12b15e83 | 504 | master->dev.of_node = dev->of_node; |
6e27388f AG |
505 | |
506 | tempp = ioremap(regaddr, size); | |
507 | if (!tempp) { | |
508 | dev_err(dev, "could not ioremap I/O port range\n"); | |
509 | ret = -EFAULT; | |
510 | goto free_master; | |
511 | } | |
512 | mps->psc = tempp; | |
513 | mps->fifo = | |
514 | (struct mpc512x_psc_fifo *)(tempp + sizeof(struct mpc52xx_psc)); | |
515 | ||
516 | ret = request_irq(mps->irq, mpc512x_psc_spi_isr, IRQF_SHARED, | |
517 | "mpc512x-psc-spi", mps); | |
518 | if (ret) | |
519 | goto free_master; | |
85085898 | 520 | init_completion(&mps->txisrdone); |
6e27388f | 521 | |
a81a5094 GS |
522 | psc_num = master->bus_num; |
523 | snprintf(clk_name, sizeof(clk_name), "psc%d_mclk", psc_num); | |
524 | clk = devm_clk_get(dev, clk_name); | |
525 | if (IS_ERR(clk)) | |
526 | goto free_irq; | |
527 | ret = clk_prepare_enable(clk); | |
528 | if (ret) | |
529 | goto free_irq; | |
530 | mps->clk_mclk = clk; | |
531 | mps->mclk_rate = clk_get_rate(clk); | |
532 | ||
6e27388f AG |
533 | ret = mpc512x_psc_spi_port_config(master, mps); |
534 | if (ret < 0) | |
a81a5094 | 535 | goto free_clock; |
6e27388f | 536 | |
6e27388f AG |
537 | ret = spi_register_master(master); |
538 | if (ret < 0) | |
a81a5094 | 539 | goto free_clock; |
6e27388f AG |
540 | |
541 | return ret; | |
542 | ||
a81a5094 GS |
543 | free_clock: |
544 | clk_disable_unprepare(mps->clk_mclk); | |
6e27388f AG |
545 | free_irq: |
546 | free_irq(mps->irq, mps); | |
547 | free_master: | |
548 | if (mps->psc) | |
549 | iounmap(mps->psc); | |
550 | spi_master_put(master); | |
551 | ||
552 | return ret; | |
553 | } | |
554 | ||
fd4a319b | 555 | static int mpc512x_psc_spi_do_remove(struct device *dev) |
6e27388f | 556 | { |
21879213 | 557 | struct spi_master *master = spi_master_get(dev_get_drvdata(dev)); |
6e27388f AG |
558 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(master); |
559 | ||
6e27388f | 560 | spi_unregister_master(master); |
a81a5094 | 561 | clk_disable_unprepare(mps->clk_mclk); |
6e27388f AG |
562 | free_irq(mps->irq, mps); |
563 | if (mps->psc) | |
564 | iounmap(mps->psc); | |
21879213 | 565 | spi_master_put(master); |
6e27388f AG |
566 | |
567 | return 0; | |
568 | } | |
569 | ||
fd4a319b | 570 | static int mpc512x_psc_spi_of_probe(struct platform_device *op) |
6e27388f AG |
571 | { |
572 | const u32 *regaddr_p; | |
573 | u64 regaddr64, size64; | |
574 | s16 id = -1; | |
575 | ||
ef7f2e83 | 576 | regaddr_p = of_get_address(op->dev.of_node, 0, &size64, NULL); |
6e27388f AG |
577 | if (!regaddr_p) { |
578 | dev_err(&op->dev, "Invalid PSC address\n"); | |
579 | return -EINVAL; | |
580 | } | |
ef7f2e83 | 581 | regaddr64 = of_translate_address(op->dev.of_node, regaddr_p); |
6e27388f AG |
582 | |
583 | /* get PSC id (0..11, used by port_config) */ | |
9d15a3ba AG |
584 | id = of_alias_get_id(op->dev.of_node, "spi"); |
585 | if (id < 0) { | |
586 | dev_err(&op->dev, "no alias id for %s\n", | |
587 | op->dev.of_node->full_name); | |
588 | return id; | |
6e27388f AG |
589 | } |
590 | ||
591 | return mpc512x_psc_spi_do_probe(&op->dev, (u32) regaddr64, (u32) size64, | |
ef7f2e83 | 592 | irq_of_parse_and_map(op->dev.of_node, 0), id); |
6e27388f AG |
593 | } |
594 | ||
fd4a319b | 595 | static int mpc512x_psc_spi_of_remove(struct platform_device *op) |
6e27388f AG |
596 | { |
597 | return mpc512x_psc_spi_do_remove(&op->dev); | |
598 | } | |
599 | ||
600 | static struct of_device_id mpc512x_psc_spi_of_match[] = { | |
601 | { .compatible = "fsl,mpc5121-psc-spi", }, | |
602 | {}, | |
603 | }; | |
604 | ||
605 | MODULE_DEVICE_TABLE(of, mpc512x_psc_spi_of_match); | |
606 | ||
18d306d1 | 607 | static struct platform_driver mpc512x_psc_spi_of_driver = { |
6e27388f | 608 | .probe = mpc512x_psc_spi_of_probe, |
fd4a319b | 609 | .remove = mpc512x_psc_spi_of_remove, |
6e27388f AG |
610 | .driver = { |
611 | .name = "mpc512x-psc-spi", | |
612 | .owner = THIS_MODULE, | |
ef7f2e83 | 613 | .of_match_table = mpc512x_psc_spi_of_match, |
6e27388f AG |
614 | }, |
615 | }; | |
940ab889 | 616 | module_platform_driver(mpc512x_psc_spi_of_driver); |
6e27388f AG |
617 | |
618 | MODULE_AUTHOR("John Rigby"); | |
619 | MODULE_DESCRIPTION("MPC512x PSC SPI Driver"); | |
620 | MODULE_LICENSE("GPL"); |