Commit | Line | Data |
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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> |
5af50730 | 23 | #include <linux/of_irq.h> |
6e27388f | 24 | #include <linux/of_platform.h> |
6e27388f AG |
25 | #include <linux/completion.h> |
26 | #include <linux/io.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/clk.h> | |
29 | #include <linux/spi/spi.h> | |
30 | #include <linux/fsl_devices.h> | |
86e98743 | 31 | #include <linux/gpio.h> |
6e27388f AG |
32 | #include <asm/mpc52xx_psc.h> |
33 | ||
34 | struct mpc512x_psc_spi { | |
35 | void (*cs_control)(struct spi_device *spi, bool on); | |
6e27388f AG |
36 | |
37 | /* driver internal data */ | |
38 | struct mpc52xx_psc __iomem *psc; | |
39 | struct mpc512x_psc_fifo __iomem *fifo; | |
40 | unsigned int irq; | |
41 | u8 bits_per_word; | |
a81a5094 GS |
42 | struct clk *clk_mclk; |
43 | u32 mclk_rate; | |
6e27388f | 44 | |
c36e93a0 | 45 | struct completion txisrdone; |
6e27388f AG |
46 | }; |
47 | ||
48 | /* controller state */ | |
49 | struct mpc512x_psc_spi_cs { | |
50 | int bits_per_word; | |
51 | int speed_hz; | |
52 | }; | |
53 | ||
54 | /* set clock freq, clock ramp, bits per work | |
55 | * if t is NULL then reset the values to the default values | |
56 | */ | |
57 | static int mpc512x_psc_spi_transfer_setup(struct spi_device *spi, | |
58 | struct spi_transfer *t) | |
59 | { | |
60 | struct mpc512x_psc_spi_cs *cs = spi->controller_state; | |
61 | ||
62 | cs->speed_hz = (t && t->speed_hz) | |
63 | ? t->speed_hz : spi->max_speed_hz; | |
64 | cs->bits_per_word = (t && t->bits_per_word) | |
65 | ? t->bits_per_word : spi->bits_per_word; | |
66 | cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8; | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static void mpc512x_psc_spi_activate_cs(struct spi_device *spi) | |
71 | { | |
72 | struct mpc512x_psc_spi_cs *cs = spi->controller_state; | |
73 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); | |
74 | struct mpc52xx_psc __iomem *psc = mps->psc; | |
75 | u32 sicr; | |
76 | u32 ccr; | |
a81a5094 | 77 | int speed; |
6e27388f AG |
78 | u16 bclkdiv; |
79 | ||
80 | sicr = in_be32(&psc->sicr); | |
81 | ||
82 | /* Set clock phase and polarity */ | |
83 | if (spi->mode & SPI_CPHA) | |
84 | sicr |= 0x00001000; | |
85 | else | |
86 | sicr &= ~0x00001000; | |
87 | ||
88 | if (spi->mode & SPI_CPOL) | |
89 | sicr |= 0x00002000; | |
90 | else | |
91 | sicr &= ~0x00002000; | |
92 | ||
93 | if (spi->mode & SPI_LSB_FIRST) | |
94 | sicr |= 0x10000000; | |
95 | else | |
96 | sicr &= ~0x10000000; | |
97 | out_be32(&psc->sicr, sicr); | |
98 | ||
99 | ccr = in_be32(&psc->ccr); | |
100 | ccr &= 0xFF000000; | |
a81a5094 GS |
101 | speed = cs->speed_hz; |
102 | if (!speed) | |
103 | speed = 1000000; /* default 1MHz */ | |
104 | bclkdiv = (mps->mclk_rate / speed) - 1; | |
6e27388f AG |
105 | |
106 | ccr |= (((bclkdiv & 0xff) << 16) | (((bclkdiv >> 8) & 0xff) << 8)); | |
107 | out_be32(&psc->ccr, ccr); | |
108 | mps->bits_per_word = cs->bits_per_word; | |
109 | ||
86e98743 | 110 | if (mps->cs_control && gpio_is_valid(spi->cs_gpio)) |
6e27388f AG |
111 | mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0); |
112 | } | |
113 | ||
114 | static void mpc512x_psc_spi_deactivate_cs(struct spi_device *spi) | |
115 | { | |
116 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); | |
117 | ||
86e98743 | 118 | if (mps->cs_control && gpio_is_valid(spi->cs_gpio)) |
6e27388f AG |
119 | mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1); |
120 | ||
121 | } | |
122 | ||
123 | /* extract and scale size field in txsz or rxsz */ | |
124 | #define MPC512x_PSC_FIFO_SZ(sz) ((sz & 0x7ff) << 2); | |
125 | ||
126 | #define EOFBYTE 1 | |
127 | ||
128 | static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi, | |
129 | struct spi_transfer *t) | |
130 | { | |
131 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); | |
6e27388f | 132 | struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; |
c36e93a0 | 133 | size_t tx_len = t->len; |
5df24ea6 | 134 | size_t rx_len = t->len; |
6e27388f AG |
135 | u8 *tx_buf = (u8 *)t->tx_buf; |
136 | u8 *rx_buf = (u8 *)t->rx_buf; | |
137 | ||
138 | if (!tx_buf && !rx_buf && t->len) | |
139 | return -EINVAL; | |
140 | ||
5df24ea6 | 141 | while (rx_len || tx_len) { |
c36e93a0 | 142 | size_t txcount; |
6e27388f AG |
143 | u8 data; |
144 | size_t fifosz; | |
c36e93a0 | 145 | size_t rxcount; |
5df24ea6 | 146 | int rxtries; |
6e27388f AG |
147 | |
148 | /* | |
5df24ea6 GS |
149 | * send the TX bytes in as large a chunk as possible |
150 | * but neither exceed the TX nor the RX FIFOs | |
6e27388f AG |
151 | */ |
152 | fifosz = MPC512x_PSC_FIFO_SZ(in_be32(&fifo->txsz)); | |
c36e93a0 | 153 | txcount = min(fifosz, tx_len); |
5df24ea6 GS |
154 | fifosz = MPC512x_PSC_FIFO_SZ(in_be32(&fifo->rxsz)); |
155 | fifosz -= in_be32(&fifo->rxcnt) + 1; | |
156 | txcount = min(fifosz, txcount); | |
157 | if (txcount) { | |
158 | ||
159 | /* fill the TX FIFO */ | |
160 | while (txcount-- > 0) { | |
161 | data = tx_buf ? *tx_buf++ : 0; | |
162 | if (tx_len == EOFBYTE && t->cs_change) | |
163 | setbits32(&fifo->txcmd, | |
164 | MPC512x_PSC_FIFO_EOF); | |
165 | out_8(&fifo->txdata_8, data); | |
166 | tx_len--; | |
167 | } | |
6e27388f | 168 | |
5df24ea6 | 169 | /* have the ISR trigger when the TX FIFO is empty */ |
16735d02 | 170 | reinit_completion(&mps->txisrdone); |
5df24ea6 GS |
171 | out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY); |
172 | out_be32(&fifo->tximr, MPC512x_PSC_FIFO_EMPTY); | |
173 | wait_for_completion(&mps->txisrdone); | |
6e27388f AG |
174 | } |
175 | ||
5df24ea6 GS |
176 | /* |
177 | * consume as much RX data as the FIFO holds, while we | |
178 | * iterate over the transfer's TX data length | |
179 | * | |
180 | * only insist in draining all the remaining RX bytes | |
181 | * when the TX bytes were exhausted (that's at the very | |
182 | * end of this transfer, not when still iterating over | |
183 | * the transfer's chunks) | |
184 | */ | |
185 | rxtries = 50; | |
186 | do { | |
187 | ||
188 | /* | |
189 | * grab whatever was in the FIFO when we started | |
190 | * looking, don't bother fetching what was added to | |
191 | * the FIFO while we read from it -- we'll return | |
192 | * here eventually and prefer sending out remaining | |
193 | * TX data | |
194 | */ | |
195 | fifosz = in_be32(&fifo->rxcnt); | |
196 | rxcount = min(fifosz, rx_len); | |
197 | while (rxcount-- > 0) { | |
198 | data = in_8(&fifo->rxdata_8); | |
199 | if (rx_buf) | |
200 | *rx_buf++ = data; | |
201 | rx_len--; | |
202 | } | |
6e27388f | 203 | |
5df24ea6 GS |
204 | /* |
205 | * come back later if there still is TX data to send, | |
206 | * bail out of the RX drain loop if all of the TX data | |
207 | * was sent and all of the RX data was received (i.e. | |
208 | * when the transmission has completed) | |
209 | */ | |
210 | if (tx_len) | |
211 | break; | |
212 | if (!rx_len) | |
213 | break; | |
214 | ||
215 | /* | |
216 | * TX data transmission has completed while RX data | |
217 | * is still pending -- that's a transient situation | |
218 | * which depends on wire speed and specific | |
219 | * hardware implementation details (buffering) yet | |
220 | * should resolve very quickly | |
221 | * | |
222 | * just yield for a moment to not hog the CPU for | |
223 | * too long when running SPI at low speed | |
224 | * | |
225 | * the timeout range is rather arbitrary and tries | |
226 | * to balance throughput against system load; the | |
227 | * chosen values result in a minimal timeout of 50 | |
228 | * times 10us and thus work at speeds as low as | |
229 | * some 20kbps, while the maximum timeout at the | |
230 | * transfer's end could be 5ms _if_ nothing else | |
231 | * ticks in the system _and_ RX data still wasn't | |
232 | * received, which only occurs in situations that | |
233 | * are exceptional; removing the unpredictability | |
234 | * of the timeout either decreases throughput | |
235 | * (longer timeouts), or puts more load on the | |
236 | * system (fixed short timeouts) or requires the | |
237 | * use of a timeout API instead of a counter and an | |
238 | * unknown inner delay | |
239 | */ | |
240 | usleep_range(10, 100); | |
241 | ||
242 | } while (--rxtries > 0); | |
243 | if (!tx_len && rx_len && !rxtries) { | |
244 | /* | |
245 | * not enough RX bytes even after several retries | |
246 | * and the resulting rather long timeout? | |
247 | */ | |
248 | rxcount = in_be32(&fifo->rxcnt); | |
249 | dev_warn(&spi->dev, | |
250 | "short xfer, missing %zd RX bytes, FIFO level %zd\n", | |
251 | rx_len, rxcount); | |
6e27388f AG |
252 | } |
253 | ||
5df24ea6 GS |
254 | /* |
255 | * drain and drop RX data which "should not be there" in | |
256 | * the first place, for undisturbed transmission this turns | |
257 | * into a NOP (except for the FIFO level fetch) | |
258 | */ | |
259 | if (!tx_len && !rx_len) { | |
260 | while (in_be32(&fifo->rxcnt)) | |
261 | in_8(&fifo->rxdata_8); | |
6e27388f | 262 | } |
5df24ea6 | 263 | |
6e27388f | 264 | } |
6e27388f AG |
265 | return 0; |
266 | } | |
267 | ||
85085898 GS |
268 | static int mpc512x_psc_spi_msg_xfer(struct spi_master *master, |
269 | struct spi_message *m) | |
6e27388f | 270 | { |
85085898 GS |
271 | struct spi_device *spi; |
272 | unsigned cs_change; | |
273 | int status; | |
274 | struct spi_transfer *t; | |
275 | ||
276 | spi = m->spi; | |
277 | cs_change = 1; | |
278 | status = 0; | |
279 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
280 | if (t->bits_per_word || t->speed_hz) { | |
281 | status = mpc512x_psc_spi_transfer_setup(spi, t); | |
282 | if (status < 0) | |
6e27388f | 283 | break; |
85085898 | 284 | } |
6e27388f | 285 | |
85085898 GS |
286 | if (cs_change) |
287 | mpc512x_psc_spi_activate_cs(spi); | |
288 | cs_change = t->cs_change; | |
6e27388f | 289 | |
85085898 GS |
290 | status = mpc512x_psc_spi_transfer_rxtx(spi, t); |
291 | if (status) | |
292 | break; | |
293 | m->actual_length += t->len; | |
6e27388f | 294 | |
85085898 GS |
295 | if (t->delay_usecs) |
296 | udelay(t->delay_usecs); | |
6e27388f | 297 | |
85085898 | 298 | if (cs_change) |
6e27388f | 299 | mpc512x_psc_spi_deactivate_cs(spi); |
85085898 | 300 | } |
6e27388f | 301 | |
85085898 GS |
302 | m->status = status; |
303 | m->complete(m->context); | |
6e27388f | 304 | |
85085898 GS |
305 | if (status || !cs_change) |
306 | mpc512x_psc_spi_deactivate_cs(spi); | |
307 | ||
308 | mpc512x_psc_spi_transfer_setup(spi, NULL); | |
309 | ||
310 | spi_finalize_current_message(master); | |
311 | return status; | |
312 | } | |
313 | ||
314 | static int mpc512x_psc_spi_prep_xfer_hw(struct spi_master *master) | |
315 | { | |
316 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(master); | |
317 | struct mpc52xx_psc __iomem *psc = mps->psc; | |
318 | ||
319 | dev_dbg(&master->dev, "%s()\n", __func__); | |
320 | ||
321 | /* Zero MR2 */ | |
322 | in_8(&psc->mode); | |
323 | out_8(&psc->mode, 0x0); | |
324 | ||
325 | /* enable transmitter/receiver */ | |
326 | out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | static int mpc512x_psc_spi_unprep_xfer_hw(struct spi_master *master) | |
332 | { | |
333 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(master); | |
334 | struct mpc52xx_psc __iomem *psc = mps->psc; | |
335 | struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; | |
336 | ||
337 | dev_dbg(&master->dev, "%s()\n", __func__); | |
338 | ||
339 | /* disable transmitter/receiver and fifo interrupt */ | |
340 | out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE); | |
341 | out_be32(&fifo->tximr, 0); | |
342 | ||
343 | return 0; | |
6e27388f AG |
344 | } |
345 | ||
346 | static int mpc512x_psc_spi_setup(struct spi_device *spi) | |
347 | { | |
6e27388f | 348 | struct mpc512x_psc_spi_cs *cs = spi->controller_state; |
86e98743 | 349 | int ret; |
6e27388f AG |
350 | |
351 | if (spi->bits_per_word % 8) | |
352 | return -EINVAL; | |
353 | ||
354 | if (!cs) { | |
355 | cs = kzalloc(sizeof *cs, GFP_KERNEL); | |
356 | if (!cs) | |
357 | return -ENOMEM; | |
86e98743 AG |
358 | |
359 | if (gpio_is_valid(spi->cs_gpio)) { | |
360 | ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev)); | |
361 | if (ret) { | |
362 | dev_err(&spi->dev, "can't get CS gpio: %d\n", | |
363 | ret); | |
364 | kfree(cs); | |
365 | return ret; | |
366 | } | |
367 | gpio_direction_output(spi->cs_gpio, | |
368 | spi->mode & SPI_CS_HIGH ? 0 : 1); | |
369 | } | |
370 | ||
6e27388f AG |
371 | spi->controller_state = cs; |
372 | } | |
373 | ||
374 | cs->bits_per_word = spi->bits_per_word; | |
375 | cs->speed_hz = spi->max_speed_hz; | |
376 | ||
6e27388f AG |
377 | return 0; |
378 | } | |
379 | ||
380 | static void mpc512x_psc_spi_cleanup(struct spi_device *spi) | |
381 | { | |
86e98743 AG |
382 | if (gpio_is_valid(spi->cs_gpio)) |
383 | gpio_free(spi->cs_gpio); | |
6e27388f AG |
384 | kfree(spi->controller_state); |
385 | } | |
386 | ||
387 | static int mpc512x_psc_spi_port_config(struct spi_master *master, | |
388 | struct mpc512x_psc_spi *mps) | |
389 | { | |
390 | struct mpc52xx_psc __iomem *psc = mps->psc; | |
391 | struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; | |
6e27388f AG |
392 | u32 sicr; |
393 | u32 ccr; | |
a81a5094 | 394 | int speed; |
6e27388f AG |
395 | u16 bclkdiv; |
396 | ||
6e27388f AG |
397 | /* Reset the PSC into a known state */ |
398 | out_8(&psc->command, MPC52xx_PSC_RST_RX); | |
399 | out_8(&psc->command, MPC52xx_PSC_RST_TX); | |
400 | out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE); | |
401 | ||
402 | /* Disable psc interrupts all useful interrupts are in fifo */ | |
403 | out_be16(&psc->isr_imr.imr, 0); | |
404 | ||
405 | /* Disable fifo interrupts, will be enabled later */ | |
406 | out_be32(&fifo->tximr, 0); | |
407 | out_be32(&fifo->rximr, 0); | |
408 | ||
409 | /* Setup fifo slice address and size */ | |
410 | /*out_be32(&fifo->txsz, 0x0fe00004);*/ | |
411 | /*out_be32(&fifo->rxsz, 0x0ff00004);*/ | |
412 | ||
413 | sicr = 0x01000000 | /* SIM = 0001 -- 8 bit */ | |
414 | 0x00800000 | /* GenClk = 1 -- internal clk */ | |
415 | 0x00008000 | /* SPI = 1 */ | |
416 | 0x00004000 | /* MSTR = 1 -- SPI master */ | |
417 | 0x00000800; /* UseEOF = 1 -- SS low until EOF */ | |
418 | ||
419 | out_be32(&psc->sicr, sicr); | |
420 | ||
421 | ccr = in_be32(&psc->ccr); | |
422 | ccr &= 0xFF000000; | |
a81a5094 GS |
423 | speed = 1000000; /* default 1MHz */ |
424 | bclkdiv = (mps->mclk_rate / speed) - 1; | |
6e27388f AG |
425 | ccr |= (((bclkdiv & 0xff) << 16) | (((bclkdiv >> 8) & 0xff) << 8)); |
426 | out_be32(&psc->ccr, ccr); | |
427 | ||
428 | /* Set 2ms DTL delay */ | |
429 | out_8(&psc->ctur, 0x00); | |
430 | out_8(&psc->ctlr, 0x82); | |
431 | ||
432 | /* we don't use the alarms */ | |
433 | out_be32(&fifo->rxalarm, 0xfff); | |
434 | out_be32(&fifo->txalarm, 0); | |
435 | ||
436 | /* Enable FIFO slices for Rx/Tx */ | |
437 | out_be32(&fifo->rxcmd, | |
438 | MPC512x_PSC_FIFO_ENABLE_SLICE | MPC512x_PSC_FIFO_ENABLE_DMA); | |
439 | out_be32(&fifo->txcmd, | |
440 | MPC512x_PSC_FIFO_ENABLE_SLICE | MPC512x_PSC_FIFO_ENABLE_DMA); | |
441 | ||
442 | mps->bits_per_word = 8; | |
443 | ||
a81a5094 | 444 | return 0; |
6e27388f AG |
445 | } |
446 | ||
447 | static irqreturn_t mpc512x_psc_spi_isr(int irq, void *dev_id) | |
448 | { | |
449 | struct mpc512x_psc_spi *mps = (struct mpc512x_psc_spi *)dev_id; | |
450 | struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; | |
451 | ||
85085898 | 452 | /* clear interrupt and wake up the rx/tx routine */ |
6e27388f AG |
453 | if (in_be32(&fifo->txisr) & |
454 | in_be32(&fifo->tximr) & MPC512x_PSC_FIFO_EMPTY) { | |
455 | out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY); | |
456 | out_be32(&fifo->tximr, 0); | |
c36e93a0 | 457 | complete(&mps->txisrdone); |
6e27388f AG |
458 | return IRQ_HANDLED; |
459 | } | |
460 | return IRQ_NONE; | |
461 | } | |
462 | ||
86e98743 AG |
463 | static void mpc512x_spi_cs_control(struct spi_device *spi, bool onoff) |
464 | { | |
465 | gpio_set_value(spi->cs_gpio, onoff); | |
466 | } | |
467 | ||
6e27388f | 468 | /* bus_num is used only for the case dev->platform_data == NULL */ |
fd4a319b | 469 | static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr, |
cf40f082 AG |
470 | u32 size, unsigned int irq, |
471 | s16 bus_num) | |
6e27388f | 472 | { |
8074cf06 | 473 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); |
6e27388f AG |
474 | struct mpc512x_psc_spi *mps; |
475 | struct spi_master *master; | |
476 | int ret; | |
477 | void *tempp; | |
a81a5094 GS |
478 | int psc_num; |
479 | char clk_name[16]; | |
480 | struct clk *clk; | |
6e27388f AG |
481 | |
482 | master = spi_alloc_master(dev, sizeof *mps); | |
483 | if (master == NULL) | |
484 | return -ENOMEM; | |
485 | ||
486 | dev_set_drvdata(dev, master); | |
487 | mps = spi_master_get_devdata(master); | |
488 | mps->irq = irq; | |
489 | ||
490 | if (pdata == NULL) { | |
86e98743 | 491 | mps->cs_control = mpc512x_spi_cs_control; |
6e27388f | 492 | master->bus_num = bus_num; |
6e27388f AG |
493 | } else { |
494 | mps->cs_control = pdata->cs_control; | |
6e27388f AG |
495 | master->bus_num = pdata->bus_num; |
496 | master->num_chipselect = pdata->max_chipselect; | |
497 | } | |
498 | ||
c88dd349 | 499 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST; |
6e27388f | 500 | master->setup = mpc512x_psc_spi_setup; |
85085898 GS |
501 | master->prepare_transfer_hardware = mpc512x_psc_spi_prep_xfer_hw; |
502 | master->transfer_one_message = mpc512x_psc_spi_msg_xfer; | |
503 | master->unprepare_transfer_hardware = mpc512x_psc_spi_unprep_xfer_hw; | |
6e27388f | 504 | master->cleanup = mpc512x_psc_spi_cleanup; |
12b15e83 | 505 | master->dev.of_node = dev->of_node; |
6e27388f AG |
506 | |
507 | tempp = ioremap(regaddr, size); | |
508 | if (!tempp) { | |
509 | dev_err(dev, "could not ioremap I/O port range\n"); | |
510 | ret = -EFAULT; | |
511 | goto free_master; | |
512 | } | |
513 | mps->psc = tempp; | |
514 | mps->fifo = | |
515 | (struct mpc512x_psc_fifo *)(tempp + sizeof(struct mpc52xx_psc)); | |
516 | ||
517 | ret = request_irq(mps->irq, mpc512x_psc_spi_isr, IRQF_SHARED, | |
518 | "mpc512x-psc-spi", mps); | |
519 | if (ret) | |
520 | goto free_master; | |
85085898 | 521 | init_completion(&mps->txisrdone); |
6e27388f | 522 | |
a81a5094 GS |
523 | psc_num = master->bus_num; |
524 | snprintf(clk_name, sizeof(clk_name), "psc%d_mclk", psc_num); | |
525 | clk = devm_clk_get(dev, clk_name); | |
eadf69cf WY |
526 | if (IS_ERR(clk)) { |
527 | ret = PTR_ERR(clk); | |
a81a5094 | 528 | goto free_irq; |
eadf69cf | 529 | } |
a81a5094 GS |
530 | ret = clk_prepare_enable(clk); |
531 | if (ret) | |
532 | goto free_irq; | |
533 | mps->clk_mclk = clk; | |
534 | mps->mclk_rate = clk_get_rate(clk); | |
535 | ||
6e27388f AG |
536 | ret = mpc512x_psc_spi_port_config(master, mps); |
537 | if (ret < 0) | |
a81a5094 | 538 | goto free_clock; |
6e27388f | 539 | |
eaa24297 | 540 | ret = devm_spi_register_master(dev, master); |
6e27388f | 541 | if (ret < 0) |
a81a5094 | 542 | goto free_clock; |
6e27388f AG |
543 | |
544 | return ret; | |
545 | ||
a81a5094 GS |
546 | free_clock: |
547 | clk_disable_unprepare(mps->clk_mclk); | |
6e27388f AG |
548 | free_irq: |
549 | free_irq(mps->irq, mps); | |
550 | free_master: | |
551 | if (mps->psc) | |
552 | iounmap(mps->psc); | |
553 | spi_master_put(master); | |
554 | ||
555 | return ret; | |
556 | } | |
557 | ||
fd4a319b | 558 | static int mpc512x_psc_spi_do_remove(struct device *dev) |
6e27388f | 559 | { |
a4469a42 | 560 | struct spi_master *master = dev_get_drvdata(dev); |
6e27388f AG |
561 | struct mpc512x_psc_spi *mps = spi_master_get_devdata(master); |
562 | ||
a81a5094 | 563 | clk_disable_unprepare(mps->clk_mclk); |
6e27388f AG |
564 | free_irq(mps->irq, mps); |
565 | if (mps->psc) | |
566 | iounmap(mps->psc); | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
fd4a319b | 571 | static int mpc512x_psc_spi_of_probe(struct platform_device *op) |
6e27388f AG |
572 | { |
573 | const u32 *regaddr_p; | |
574 | u64 regaddr64, size64; | |
575 | s16 id = -1; | |
576 | ||
ef7f2e83 | 577 | regaddr_p = of_get_address(op->dev.of_node, 0, &size64, NULL); |
6e27388f AG |
578 | if (!regaddr_p) { |
579 | dev_err(&op->dev, "Invalid PSC address\n"); | |
580 | return -EINVAL; | |
581 | } | |
ef7f2e83 | 582 | regaddr64 = of_translate_address(op->dev.of_node, regaddr_p); |
6e27388f AG |
583 | |
584 | /* get PSC id (0..11, used by port_config) */ | |
9d15a3ba AG |
585 | id = of_alias_get_id(op->dev.of_node, "spi"); |
586 | if (id < 0) { | |
587 | dev_err(&op->dev, "no alias id for %s\n", | |
588 | op->dev.of_node->full_name); | |
589 | return id; | |
6e27388f AG |
590 | } |
591 | ||
592 | return mpc512x_psc_spi_do_probe(&op->dev, (u32) regaddr64, (u32) size64, | |
ef7f2e83 | 593 | irq_of_parse_and_map(op->dev.of_node, 0), id); |
6e27388f AG |
594 | } |
595 | ||
fd4a319b | 596 | static int mpc512x_psc_spi_of_remove(struct platform_device *op) |
6e27388f AG |
597 | { |
598 | return mpc512x_psc_spi_do_remove(&op->dev); | |
599 | } | |
600 | ||
601 | static struct of_device_id mpc512x_psc_spi_of_match[] = { | |
602 | { .compatible = "fsl,mpc5121-psc-spi", }, | |
603 | {}, | |
604 | }; | |
605 | ||
606 | MODULE_DEVICE_TABLE(of, mpc512x_psc_spi_of_match); | |
607 | ||
18d306d1 | 608 | static struct platform_driver mpc512x_psc_spi_of_driver = { |
6e27388f | 609 | .probe = mpc512x_psc_spi_of_probe, |
fd4a319b | 610 | .remove = mpc512x_psc_spi_of_remove, |
6e27388f AG |
611 | .driver = { |
612 | .name = "mpc512x-psc-spi", | |
613 | .owner = THIS_MODULE, | |
ef7f2e83 | 614 | .of_match_table = mpc512x_psc_spi_of_match, |
6e27388f AG |
615 | }, |
616 | }; | |
940ab889 | 617 | module_platform_driver(mpc512x_psc_spi_of_driver); |
6e27388f AG |
618 | |
619 | MODULE_AUTHOR("John Rigby"); | |
620 | MODULE_DESCRIPTION("MPC512x PSC SPI Driver"); | |
621 | MODULE_LICENSE("GPL"); |