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e8beacbb AL |
1 | /* |
2 | * Freescale SPI controller driver cpm functions. | |
3 | * | |
4 | * Maintainer: Kumar Gala | |
5 | * | |
6 | * Copyright (C) 2006 Polycom, Inc. | |
7 | * Copyright 2010 Freescale Semiconductor, Inc. | |
8 | * | |
9 | * CPM SPI and QE buffer descriptors mode support: | |
10 | * Copyright (c) 2009 MontaVista Software, Inc. | |
11 | * Author: Anton Vorontsov <avorontsov@ru.mvista.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms of the GNU General Public License as published by the | |
15 | * Free Software Foundation; either version 2 of the License, or (at your | |
16 | * option) any later version. | |
17 | */ | |
e8beacbb AL |
18 | #include <asm/cpm.h> |
19 | #include <asm/qe.h> | |
a3108360 XL |
20 | #include <linux/dma-mapping.h> |
21 | #include <linux/fsl_devices.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/of_address.h> | |
24 | #include <linux/spi/spi.h> | |
25 | #include <linux/types.h> | |
e8beacbb | 26 | |
e8beacbb | 27 | #include "spi-fsl-cpm.h" |
a3108360 | 28 | #include "spi-fsl-lib.h" |
e8beacbb AL |
29 | #include "spi-fsl-spi.h" |
30 | ||
31 | /* CPM1 and CPM2 are mutually exclusive. */ | |
32 | #ifdef CONFIG_CPM1 | |
33 | #include <asm/cpm1.h> | |
34 | #define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0) | |
35 | #else | |
36 | #include <asm/cpm2.h> | |
37 | #define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0) | |
38 | #endif | |
39 | ||
40 | #define SPIE_TXB 0x00000200 /* Last char is written to tx fifo */ | |
41 | #define SPIE_RXB 0x00000100 /* Last char is written to rx buf */ | |
42 | ||
43 | /* SPCOM register values */ | |
44 | #define SPCOM_STR (1 << 23) /* Start transmit */ | |
45 | ||
46 | #define SPI_PRAM_SIZE 0x100 | |
47 | #define SPI_MRBLR ((unsigned int)PAGE_SIZE) | |
48 | ||
49 | static void *fsl_dummy_rx; | |
50 | static DEFINE_MUTEX(fsl_dummy_rx_lock); | |
51 | static int fsl_dummy_rx_refcnt; | |
52 | ||
53 | void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi) | |
54 | { | |
55 | if (mspi->flags & SPI_QE) { | |
56 | qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock, | |
57 | QE_CR_PROTOCOL_UNSPECIFIED, 0); | |
58 | } else { | |
59 | cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX); | |
60 | if (mspi->flags & SPI_CPM1) { | |
61 | out_be16(&mspi->pram->rbptr, | |
62 | in_be16(&mspi->pram->rbase)); | |
63 | out_be16(&mspi->pram->tbptr, | |
64 | in_be16(&mspi->pram->tbase)); | |
65 | } | |
66 | } | |
67 | } | |
68 | ||
69 | static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi) | |
70 | { | |
71 | struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd; | |
72 | struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd; | |
73 | unsigned int xfer_len = min(mspi->count, SPI_MRBLR); | |
74 | unsigned int xfer_ofs; | |
75 | struct fsl_spi_reg *reg_base = mspi->reg_base; | |
76 | ||
77 | xfer_ofs = mspi->xfer_in_progress->len - mspi->count; | |
78 | ||
79 | if (mspi->rx_dma == mspi->dma_dummy_rx) | |
80 | out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma); | |
81 | else | |
82 | out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs); | |
83 | out_be16(&rx_bd->cbd_datlen, 0); | |
84 | out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP); | |
85 | ||
86 | if (mspi->tx_dma == mspi->dma_dummy_tx) | |
87 | out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma); | |
88 | else | |
89 | out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs); | |
90 | out_be16(&tx_bd->cbd_datlen, xfer_len); | |
91 | out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP | | |
92 | BD_SC_LAST); | |
93 | ||
94 | /* start transfer */ | |
95 | mpc8xxx_spi_write_reg(®_base->command, SPCOM_STR); | |
96 | } | |
97 | ||
98 | int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi, | |
99 | struct spi_transfer *t, bool is_dma_mapped) | |
100 | { | |
101 | struct device *dev = mspi->dev; | |
102 | struct fsl_spi_reg *reg_base = mspi->reg_base; | |
103 | ||
104 | if (is_dma_mapped) { | |
105 | mspi->map_tx_dma = 0; | |
106 | mspi->map_rx_dma = 0; | |
107 | } else { | |
108 | mspi->map_tx_dma = 1; | |
109 | mspi->map_rx_dma = 1; | |
110 | } | |
111 | ||
112 | if (!t->tx_buf) { | |
113 | mspi->tx_dma = mspi->dma_dummy_tx; | |
114 | mspi->map_tx_dma = 0; | |
115 | } | |
116 | ||
117 | if (!t->rx_buf) { | |
118 | mspi->rx_dma = mspi->dma_dummy_rx; | |
119 | mspi->map_rx_dma = 0; | |
120 | } | |
121 | ||
122 | if (mspi->map_tx_dma) { | |
123 | void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */ | |
124 | ||
125 | mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len, | |
126 | DMA_TO_DEVICE); | |
127 | if (dma_mapping_error(dev, mspi->tx_dma)) { | |
128 | dev_err(dev, "unable to map tx dma\n"); | |
129 | return -ENOMEM; | |
130 | } | |
131 | } else if (t->tx_buf) { | |
132 | mspi->tx_dma = t->tx_dma; | |
133 | } | |
134 | ||
135 | if (mspi->map_rx_dma) { | |
136 | mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len, | |
137 | DMA_FROM_DEVICE); | |
138 | if (dma_mapping_error(dev, mspi->rx_dma)) { | |
139 | dev_err(dev, "unable to map rx dma\n"); | |
140 | goto err_rx_dma; | |
141 | } | |
142 | } else if (t->rx_buf) { | |
143 | mspi->rx_dma = t->rx_dma; | |
144 | } | |
145 | ||
146 | /* enable rx ints */ | |
147 | mpc8xxx_spi_write_reg(®_base->mask, SPIE_RXB); | |
148 | ||
149 | mspi->xfer_in_progress = t; | |
150 | mspi->count = t->len; | |
151 | ||
152 | /* start CPM transfers */ | |
153 | fsl_spi_cpm_bufs_start(mspi); | |
154 | ||
155 | return 0; | |
156 | ||
157 | err_rx_dma: | |
158 | if (mspi->map_tx_dma) | |
159 | dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); | |
160 | return -ENOMEM; | |
161 | } | |
162 | ||
163 | void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi) | |
164 | { | |
165 | struct device *dev = mspi->dev; | |
166 | struct spi_transfer *t = mspi->xfer_in_progress; | |
167 | ||
168 | if (mspi->map_tx_dma) | |
169 | dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); | |
170 | if (mspi->map_rx_dma) | |
171 | dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE); | |
172 | mspi->xfer_in_progress = NULL; | |
173 | } | |
174 | ||
175 | void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events) | |
176 | { | |
177 | u16 len; | |
178 | struct fsl_spi_reg *reg_base = mspi->reg_base; | |
179 | ||
180 | dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__, | |
181 | in_be16(&mspi->rx_bd->cbd_datlen), mspi->count); | |
182 | ||
183 | len = in_be16(&mspi->rx_bd->cbd_datlen); | |
184 | if (len > mspi->count) { | |
185 | WARN_ON(1); | |
186 | len = mspi->count; | |
187 | } | |
188 | ||
189 | /* Clear the events */ | |
190 | mpc8xxx_spi_write_reg(®_base->event, events); | |
191 | ||
192 | mspi->count -= len; | |
193 | if (mspi->count) | |
194 | fsl_spi_cpm_bufs_start(mspi); | |
195 | else | |
196 | complete(&mspi->done); | |
197 | } | |
198 | ||
199 | static void *fsl_spi_alloc_dummy_rx(void) | |
200 | { | |
201 | mutex_lock(&fsl_dummy_rx_lock); | |
202 | ||
203 | if (!fsl_dummy_rx) | |
204 | fsl_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL); | |
205 | if (fsl_dummy_rx) | |
206 | fsl_dummy_rx_refcnt++; | |
207 | ||
208 | mutex_unlock(&fsl_dummy_rx_lock); | |
209 | ||
210 | return fsl_dummy_rx; | |
211 | } | |
212 | ||
213 | static void fsl_spi_free_dummy_rx(void) | |
214 | { | |
215 | mutex_lock(&fsl_dummy_rx_lock); | |
216 | ||
217 | switch (fsl_dummy_rx_refcnt) { | |
218 | case 0: | |
219 | WARN_ON(1); | |
220 | break; | |
221 | case 1: | |
222 | kfree(fsl_dummy_rx); | |
223 | fsl_dummy_rx = NULL; | |
224 | /* fall through */ | |
225 | default: | |
226 | fsl_dummy_rx_refcnt--; | |
227 | break; | |
228 | } | |
229 | ||
230 | mutex_unlock(&fsl_dummy_rx_lock); | |
231 | } | |
232 | ||
233 | static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi) | |
234 | { | |
235 | struct device *dev = mspi->dev; | |
236 | struct device_node *np = dev->of_node; | |
237 | const u32 *iprop; | |
238 | int size; | |
239 | void __iomem *spi_base; | |
240 | unsigned long pram_ofs = -ENOMEM; | |
241 | ||
242 | /* Can't use of_address_to_resource(), QE muram isn't at 0. */ | |
243 | iprop = of_get_property(np, "reg", &size); | |
244 | ||
245 | /* QE with a fixed pram location? */ | |
246 | if (mspi->flags & SPI_QE && iprop && size == sizeof(*iprop) * 4) | |
247 | return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE); | |
248 | ||
249 | /* QE but with a dynamic pram location? */ | |
250 | if (mspi->flags & SPI_QE) { | |
251 | pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); | |
252 | qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock, | |
253 | QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs); | |
254 | return pram_ofs; | |
255 | } | |
256 | ||
257 | spi_base = of_iomap(np, 1); | |
258 | if (spi_base == NULL) | |
259 | return -EINVAL; | |
260 | ||
261 | if (mspi->flags & SPI_CPM2) { | |
262 | pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); | |
263 | out_be16(spi_base, pram_ofs); | |
264 | } else { | |
265 | struct spi_pram __iomem *pram = spi_base; | |
266 | u16 rpbase = in_be16(&pram->rpbase); | |
267 | ||
268 | /* Microcode relocation patch applied? */ | |
269 | if (rpbase) { | |
270 | pram_ofs = rpbase; | |
271 | } else { | |
272 | pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); | |
273 | out_be16(spi_base, pram_ofs); | |
274 | } | |
275 | } | |
276 | ||
277 | iounmap(spi_base); | |
278 | return pram_ofs; | |
279 | } | |
280 | ||
281 | int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi) | |
282 | { | |
283 | struct device *dev = mspi->dev; | |
284 | struct device_node *np = dev->of_node; | |
285 | const u32 *iprop; | |
286 | int size; | |
287 | unsigned long pram_ofs; | |
288 | unsigned long bds_ofs; | |
289 | ||
290 | if (!(mspi->flags & SPI_CPM_MODE)) | |
291 | return 0; | |
292 | ||
293 | if (!fsl_spi_alloc_dummy_rx()) | |
294 | return -ENOMEM; | |
295 | ||
296 | if (mspi->flags & SPI_QE) { | |
297 | iprop = of_get_property(np, "cell-index", &size); | |
298 | if (iprop && size == sizeof(*iprop)) | |
299 | mspi->subblock = *iprop; | |
300 | ||
301 | switch (mspi->subblock) { | |
302 | default: | |
a1829d2b | 303 | dev_warn(dev, "cell-index unspecified, assuming SPI1\n"); |
e8beacbb AL |
304 | /* fall through */ |
305 | case 0: | |
306 | mspi->subblock = QE_CR_SUBBLOCK_SPI1; | |
307 | break; | |
308 | case 1: | |
309 | mspi->subblock = QE_CR_SUBBLOCK_SPI2; | |
310 | break; | |
311 | } | |
312 | } | |
313 | ||
314 | pram_ofs = fsl_spi_cpm_get_pram(mspi); | |
315 | if (IS_ERR_VALUE(pram_ofs)) { | |
316 | dev_err(dev, "can't allocate spi parameter ram\n"); | |
317 | goto err_pram; | |
318 | } | |
319 | ||
320 | bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) + | |
321 | sizeof(*mspi->rx_bd), 8); | |
322 | if (IS_ERR_VALUE(bds_ofs)) { | |
323 | dev_err(dev, "can't allocate bds\n"); | |
324 | goto err_bds; | |
325 | } | |
326 | ||
327 | mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE, | |
328 | DMA_TO_DEVICE); | |
329 | if (dma_mapping_error(dev, mspi->dma_dummy_tx)) { | |
330 | dev_err(dev, "unable to map dummy tx buffer\n"); | |
331 | goto err_dummy_tx; | |
332 | } | |
333 | ||
334 | mspi->dma_dummy_rx = dma_map_single(dev, fsl_dummy_rx, SPI_MRBLR, | |
335 | DMA_FROM_DEVICE); | |
336 | if (dma_mapping_error(dev, mspi->dma_dummy_rx)) { | |
337 | dev_err(dev, "unable to map dummy rx buffer\n"); | |
338 | goto err_dummy_rx; | |
339 | } | |
340 | ||
341 | mspi->pram = cpm_muram_addr(pram_ofs); | |
342 | ||
343 | mspi->tx_bd = cpm_muram_addr(bds_ofs); | |
344 | mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd)); | |
345 | ||
346 | /* Initialize parameter ram. */ | |
347 | out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd)); | |
348 | out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd)); | |
349 | out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL); | |
350 | out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL); | |
351 | out_be16(&mspi->pram->mrblr, SPI_MRBLR); | |
352 | out_be32(&mspi->pram->rstate, 0); | |
353 | out_be32(&mspi->pram->rdp, 0); | |
354 | out_be16(&mspi->pram->rbptr, 0); | |
355 | out_be16(&mspi->pram->rbc, 0); | |
356 | out_be32(&mspi->pram->rxtmp, 0); | |
357 | out_be32(&mspi->pram->tstate, 0); | |
358 | out_be32(&mspi->pram->tdp, 0); | |
359 | out_be16(&mspi->pram->tbptr, 0); | |
360 | out_be16(&mspi->pram->tbc, 0); | |
361 | out_be32(&mspi->pram->txtmp, 0); | |
362 | ||
363 | return 0; | |
364 | ||
365 | err_dummy_rx: | |
366 | dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE); | |
367 | err_dummy_tx: | |
368 | cpm_muram_free(bds_ofs); | |
369 | err_bds: | |
370 | cpm_muram_free(pram_ofs); | |
371 | err_pram: | |
372 | fsl_spi_free_dummy_rx(); | |
373 | return -ENOMEM; | |
374 | } | |
375 | ||
376 | void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi) | |
377 | { | |
378 | struct device *dev = mspi->dev; | |
379 | ||
380 | if (!(mspi->flags & SPI_CPM_MODE)) | |
381 | return; | |
382 | ||
383 | dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE); | |
384 | dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE); | |
385 | cpm_muram_free(cpm_muram_offset(mspi->tx_bd)); | |
386 | cpm_muram_free(cpm_muram_offset(mspi->pram)); | |
387 | fsl_spi_free_dummy_rx(); | |
388 | } |