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Linux/drivers/mmc/host/sh_mobile_sdhi.c

  1 /*
  2  * SuperH Mobile SDHI
  3  *
  4  * Copyright (C) 2009 Magnus Damm
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  *
 10  * Based on "Compaq ASIC3 support":
 11  *
 12  * Copyright 2001 Compaq Computer Corporation.
 13  * Copyright 2004-2005 Phil Blundell
 14  * Copyright 2007-2008 OpenedHand Ltd.
 15  *
 16  * Authors: Phil Blundell <pb@handhelds.org>,
 17  *          Samuel Ortiz <sameo@openedhand.com>
 18  *
 19  */
 20 
 21 #include <linux/kernel.h>
 22 #include <linux/clk.h>
 23 #include <linux/slab.h>
 24 #include <linux/mod_devicetable.h>
 25 #include <linux/module.h>
 26 #include <linux/of_device.h>
 27 #include <linux/platform_device.h>
 28 #include <linux/mmc/host.h>
 29 #include <linux/mmc/sh_mobile_sdhi.h>
 30 #include <linux/mfd/tmio.h>
 31 #include <linux/sh_dma.h>
 32 #include <linux/delay.h>
 33 
 34 #include "tmio_mmc.h"
 35 
 36 #define EXT_ACC           0xe4
 37 
 38 #define host_to_priv(host) container_of((host)->pdata, struct sh_mobile_sdhi, mmc_data)
 39 
 40 struct sh_mobile_sdhi_of_data {
 41         unsigned long tmio_flags;
 42         unsigned long capabilities;
 43         unsigned long capabilities2;
 44         enum dma_slave_buswidth dma_buswidth;
 45         dma_addr_t dma_rx_offset;
 46 };
 47 
 48 static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
 49         {
 50                 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
 51         },
 52 };
 53 
 54 static const struct sh_mobile_sdhi_of_data of_rcar_gen1_compatible = {
 55         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
 56                           TMIO_MMC_CLK_ACTUAL,
 57         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
 58 };
 59 
 60 static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = {
 61         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
 62                           TMIO_MMC_CLK_ACTUAL,
 63         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
 64         .dma_buswidth   = DMA_SLAVE_BUSWIDTH_4_BYTES,
 65         .dma_rx_offset  = 0x2000,
 66 };
 67 
 68 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
 69         { .compatible = "renesas,sdhi-shmobile" },
 70         { .compatible = "renesas,sdhi-sh7372" },
 71         { .compatible = "renesas,sdhi-sh73a0", .data = &sh_mobile_sdhi_of_cfg[0], },
 72         { .compatible = "renesas,sdhi-r8a73a4", .data = &sh_mobile_sdhi_of_cfg[0], },
 73         { .compatible = "renesas,sdhi-r8a7740", .data = &sh_mobile_sdhi_of_cfg[0], },
 74         { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
 75         { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
 76         { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
 77         { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
 78         { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
 79         { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
 80         { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
 81         {},
 82 };
 83 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
 84 
 85 struct sh_mobile_sdhi {
 86         struct clk *clk;
 87         struct tmio_mmc_data mmc_data;
 88         struct tmio_mmc_dma dma_priv;
 89 };
 90 
 91 static void sh_mobile_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width)
 92 {
 93         u32 val;
 94 
 95         /*
 96          * see also
 97          *      sh_mobile_sdhi_of_data :: dma_buswidth
 98          */
 99         switch (sd_ctrl_read16(host, CTL_VERSION)) {
100         case 0x490C:
101                 val = (width == 32) ? 0x0001 : 0x0000;
102                 break;
103         case 0xCB0D:
104                 val = (width == 32) ? 0x0000 : 0x0001;
105                 break;
106         default:
107                 /* nothing to do */
108                 return;
109         }
110 
111         sd_ctrl_write16(host, EXT_ACC, val);
112 }
113 
114 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
115 {
116         struct mmc_host *mmc = platform_get_drvdata(pdev);
117         struct tmio_mmc_host *host = mmc_priv(mmc);
118         struct sh_mobile_sdhi *priv = host_to_priv(host);
119         int ret = clk_prepare_enable(priv->clk);
120         if (ret < 0)
121                 return ret;
122 
123         *f = clk_get_rate(priv->clk);
124 
125         /* enable 16bit data access on SDBUF as default */
126         sh_mobile_sdhi_sdbuf_width(host, 16);
127 
128         return 0;
129 }
130 
131 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
132 {
133         struct mmc_host *mmc = platform_get_drvdata(pdev);
134         struct tmio_mmc_host *host = mmc_priv(mmc);
135         struct sh_mobile_sdhi *priv = host_to_priv(host);
136         clk_disable_unprepare(priv->clk);
137 }
138 
139 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
140 {
141         int timeout = 1000;
142 
143         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
144                 udelay(1);
145 
146         if (!timeout) {
147                 dev_warn(&host->pdev->dev, "timeout waiting for SD bus idle\n");
148                 return -EBUSY;
149         }
150 
151         return 0;
152 }
153 
154 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
155 {
156         switch (addr)
157         {
158         case CTL_SD_CMD:
159         case CTL_STOP_INTERNAL_ACTION:
160         case CTL_XFER_BLK_COUNT:
161         case CTL_SD_CARD_CLK_CTL:
162         case CTL_SD_XFER_LEN:
163         case CTL_SD_MEM_CARD_OPT:
164         case CTL_TRANSACTION_CTL:
165         case CTL_DMA_ENABLE:
166                 return sh_mobile_sdhi_wait_idle(host);
167         }
168 
169         return 0;
170 }
171 
172 static int sh_mobile_sdhi_multi_io_quirk(struct mmc_card *card,
173                                          unsigned int direction, int blk_size)
174 {
175         /*
176          * In Renesas controllers, when performing a
177          * multiple block read of one or two blocks,
178          * depending on the timing with which the
179          * response register is read, the response
180          * value may not be read properly.
181          * Use single block read for this HW bug
182          */
183         if ((direction == MMC_DATA_READ) &&
184             blk_size == 2)
185                 return 1;
186 
187         return blk_size;
188 }
189 
190 static void sh_mobile_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
191 {
192         sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? 2 : 0);
193 
194         /* enable 32bit access if DMA mode if possibile */
195         sh_mobile_sdhi_sdbuf_width(host, enable ? 32 : 16);
196 }
197 
198 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
199 {
200         const struct of_device_id *of_id =
201                 of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
202         struct sh_mobile_sdhi *priv;
203         struct tmio_mmc_data *mmc_data;
204         struct tmio_mmc_data *mmd = pdev->dev.platform_data;
205         struct tmio_mmc_host *host;
206         struct resource *res;
207         int irq, ret, i = 0;
208         bool multiplexed_isr = true;
209         struct tmio_mmc_dma *dma_priv;
210 
211         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
212         if (!res)
213                 return -EINVAL;
214 
215         priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
216         if (priv == NULL) {
217                 dev_err(&pdev->dev, "kzalloc failed\n");
218                 return -ENOMEM;
219         }
220 
221         mmc_data = &priv->mmc_data;
222         dma_priv = &priv->dma_priv;
223 
224         priv->clk = devm_clk_get(&pdev->dev, NULL);
225         if (IS_ERR(priv->clk)) {
226                 ret = PTR_ERR(priv->clk);
227                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
228                 goto eprobe;
229         }
230 
231         host = tmio_mmc_host_alloc(pdev);
232         if (!host) {
233                 ret = -ENOMEM;
234                 goto eprobe;
235         }
236 
237         host->dma               = dma_priv;
238         host->write16_hook      = sh_mobile_sdhi_write16_hook;
239         host->clk_enable        = sh_mobile_sdhi_clk_enable;
240         host->clk_disable       = sh_mobile_sdhi_clk_disable;
241         host->multi_io_quirk    = sh_mobile_sdhi_multi_io_quirk;
242         /* SD control register space size is 0x100, 0x200 for bus_shift=1 */
243         if (resource_size(res) > 0x100)
244                 host->bus_shift = 1;
245         else
246                 host->bus_shift = 0;
247 
248         if (mmd)
249                 *mmc_data = *mmd;
250 
251         dma_priv->filter = shdma_chan_filter;
252         dma_priv->enable = sh_mobile_sdhi_enable_dma;
253 
254         mmc_data->alignment_shift = 1; /* 2-byte alignment */
255         mmc_data->capabilities |= MMC_CAP_MMC_HIGHSPEED;
256 
257         /*
258          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
259          * bus width mode.
260          */
261         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
262 
263         /*
264          * All SDHI blocks support SDIO IRQ signalling.
265          */
266         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
267 
268         /*
269          * All SDHI have CMD12 controll bit
270          */
271         mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL;
272 
273         /*
274          * All SDHI need SDIO_INFO1 reserved bit
275          */
276         mmc_data->flags |= TMIO_MMC_SDIO_STATUS_QUIRK;
277 
278         if (of_id && of_id->data) {
279                 const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
280                 mmc_data->flags |= of_data->tmio_flags;
281                 mmc_data->capabilities |= of_data->capabilities;
282                 mmc_data->capabilities2 |= of_data->capabilities2;
283                 mmc_data->dma_rx_offset = of_data->dma_rx_offset;
284                 dma_priv->dma_buswidth = of_data->dma_buswidth;
285         }
286 
287         ret = tmio_mmc_host_probe(host, mmc_data);
288         if (ret < 0)
289                 goto efree;
290 
291         /*
292          * Allow one or more specific (named) ISRs or
293          * one or more multiplexed (un-named) ISRs.
294          */
295 
296         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
297         if (irq >= 0) {
298                 multiplexed_isr = false;
299                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0,
300                                   dev_name(&pdev->dev), host);
301                 if (ret)
302                         goto eirq;
303         }
304 
305         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
306         if (irq >= 0) {
307                 multiplexed_isr = false;
308                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0,
309                                   dev_name(&pdev->dev), host);
310                 if (ret)
311                         goto eirq;
312         }
313 
314         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
315         if (irq >= 0) {
316                 multiplexed_isr = false;
317                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0,
318                                   dev_name(&pdev->dev), host);
319                 if (ret)
320                         goto eirq;
321         } else if (!multiplexed_isr) {
322                 dev_err(&pdev->dev,
323                         "Principal SD-card IRQ is missing among named interrupts\n");
324                 ret = irq;
325                 goto eirq;
326         }
327 
328         if (multiplexed_isr) {
329                 while (1) {
330                         irq = platform_get_irq(pdev, i);
331                         if (irq < 0)
332                                 break;
333                         i++;
334                         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
335                                           dev_name(&pdev->dev), host);
336                         if (ret)
337                                 goto eirq;
338                 }
339 
340                 /* There must be at least one IRQ source */
341                 if (!i) {
342                         ret = irq;
343                         goto eirq;
344                 }
345         }
346 
347         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
348                  mmc_hostname(host->mmc), (unsigned long)
349                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
350                  host->mmc->f_max / 1000000);
351 
352         return ret;
353 
354 eirq:
355         tmio_mmc_host_remove(host);
356 efree:
357         tmio_mmc_host_free(host);
358 eprobe:
359         return ret;
360 }
361 
362 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
363 {
364         struct mmc_host *mmc = platform_get_drvdata(pdev);
365         struct tmio_mmc_host *host = mmc_priv(mmc);
366 
367         tmio_mmc_host_remove(host);
368 
369         return 0;
370 }
371 
372 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
373         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
374                         pm_runtime_force_resume)
375         SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
376                         tmio_mmc_host_runtime_resume,
377                         NULL)
378 };
379 
380 static struct platform_driver sh_mobile_sdhi_driver = {
381         .driver         = {
382                 .name   = "sh_mobile_sdhi",
383                 .pm     = &tmio_mmc_dev_pm_ops,
384                 .of_match_table = sh_mobile_sdhi_of_match,
385         },
386         .probe          = sh_mobile_sdhi_probe,
387         .remove         = sh_mobile_sdhi_remove,
388 };
389 
390 module_platform_driver(sh_mobile_sdhi_driver);
391 
392 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
393 MODULE_AUTHOR("Magnus Damm");
394 MODULE_LICENSE("GPL v2");
395 MODULE_ALIAS("platform:sh_mobile_sdhi");
396 

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