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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 struct sh_mobile_sdhi_of_data {
 39         unsigned long tmio_flags;
 40         unsigned long capabilities;
 41         unsigned long capabilities2;
 42         dma_addr_t dma_rx_offset;
 43 };
 44 
 45 static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
 46         {
 47                 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
 48         },
 49 };
 50 
 51 static const struct sh_mobile_sdhi_of_data of_rcar_gen1_compatible = {
 52         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
 53                           TMIO_MMC_CLK_ACTUAL,
 54         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
 55 };
 56 
 57 static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = {
 58         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
 59                           TMIO_MMC_CLK_ACTUAL,
 60         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
 61         .dma_rx_offset  = 0x2000,
 62 };
 63 
 64 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
 65         { .compatible = "renesas,sdhi-shmobile" },
 66         { .compatible = "renesas,sdhi-sh7372" },
 67         { .compatible = "renesas,sdhi-sh73a0", .data = &sh_mobile_sdhi_of_cfg[0], },
 68         { .compatible = "renesas,sdhi-r8a73a4", .data = &sh_mobile_sdhi_of_cfg[0], },
 69         { .compatible = "renesas,sdhi-r8a7740", .data = &sh_mobile_sdhi_of_cfg[0], },
 70         { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
 71         { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
 72         { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
 73         { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
 74         { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
 75         { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
 76         { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
 77         {},
 78 };
 79 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
 80 
 81 struct sh_mobile_sdhi {
 82         struct clk *clk;
 83         struct tmio_mmc_data mmc_data;
 84         struct tmio_mmc_dma dma_priv;
 85 };
 86 
 87 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
 88 {
 89         struct mmc_host *mmc = platform_get_drvdata(pdev);
 90         struct tmio_mmc_host *host = mmc_priv(mmc);
 91         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 92         int ret = clk_prepare_enable(priv->clk);
 93         if (ret < 0)
 94                 return ret;
 95 
 96         *f = clk_get_rate(priv->clk);
 97         return 0;
 98 }
 99 
100 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
101 {
102         struct mmc_host *mmc = platform_get_drvdata(pdev);
103         struct tmio_mmc_host *host = mmc_priv(mmc);
104         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
105         clk_disable_unprepare(priv->clk);
106 }
107 
108 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
109 {
110         int timeout = 1000;
111 
112         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
113                 udelay(1);
114 
115         if (!timeout) {
116                 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
117                 return -EBUSY;
118         }
119 
120         return 0;
121 }
122 
123 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
124 {
125         switch (addr)
126         {
127         case CTL_SD_CMD:
128         case CTL_STOP_INTERNAL_ACTION:
129         case CTL_XFER_BLK_COUNT:
130         case CTL_SD_CARD_CLK_CTL:
131         case CTL_SD_XFER_LEN:
132         case CTL_SD_MEM_CARD_OPT:
133         case CTL_TRANSACTION_CTL:
134         case CTL_DMA_ENABLE:
135                 return sh_mobile_sdhi_wait_idle(host);
136         }
137 
138         return 0;
139 }
140 
141 static int sh_mobile_sdhi_multi_io_quirk(struct mmc_card *card,
142                                          unsigned int direction, int blk_size)
143 {
144         /*
145          * In Renesas controllers, when performing a
146          * multiple block read of one or two blocks,
147          * depending on the timing with which the
148          * response register is read, the response
149          * value may not be read properly.
150          * Use single block read for this HW bug
151          */
152         if ((direction == MMC_DATA_READ) &&
153             blk_size == 2)
154                 return 1;
155 
156         return blk_size;
157 }
158 
159 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
160 {
161         mmc_detect_change(platform_get_drvdata(pdev), msecs_to_jiffies(100));
162 }
163 
164 static const struct sh_mobile_sdhi_ops sdhi_ops = {
165         .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
166 };
167 
168 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
169 {
170         const struct of_device_id *of_id =
171                 of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
172         struct sh_mobile_sdhi *priv;
173         struct tmio_mmc_data *mmc_data;
174         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
175         struct tmio_mmc_host *host;
176         struct resource *res;
177         int irq, ret, i = 0;
178         bool multiplexed_isr = true;
179         struct tmio_mmc_dma *dma_priv;
180         u16 ver;
181 
182         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
183         if (!res)
184                 return -EINVAL;
185 
186         priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
187         if (priv == NULL) {
188                 dev_err(&pdev->dev, "kzalloc failed\n");
189                 return -ENOMEM;
190         }
191 
192         mmc_data = &priv->mmc_data;
193         dma_priv = &priv->dma_priv;
194 
195         if (p) {
196                 if (p->init) {
197                         ret = p->init(pdev, &sdhi_ops);
198                         if (ret)
199                                 return ret;
200                 }
201         }
202 
203         priv->clk = devm_clk_get(&pdev->dev, NULL);
204         if (IS_ERR(priv->clk)) {
205                 ret = PTR_ERR(priv->clk);
206                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
207                 goto eclkget;
208         }
209 
210         mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
211         mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
212         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
213         mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
214         mmc_data->multi_io_quirk = sh_mobile_sdhi_multi_io_quirk;
215         if (p) {
216                 mmc_data->flags = p->tmio_flags;
217                 mmc_data->ocr_mask = p->tmio_ocr_mask;
218                 mmc_data->capabilities |= p->tmio_caps;
219                 mmc_data->capabilities2 |= p->tmio_caps2;
220                 mmc_data->cd_gpio = p->cd_gpio;
221 
222                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
223                         /*
224                          * Yes, we have to provide slave IDs twice to TMIO:
225                          * once as a filter parameter and once for channel
226                          * configuration as an explicit slave ID
227                          */
228                         dma_priv->chan_priv_tx = (void *)p->dma_slave_tx;
229                         dma_priv->chan_priv_rx = (void *)p->dma_slave_rx;
230                         dma_priv->slave_id_tx = p->dma_slave_tx;
231                         dma_priv->slave_id_rx = p->dma_slave_rx;
232                 }
233         }
234 
235         dma_priv->alignment_shift = 1; /* 2-byte alignment */
236         dma_priv->filter = shdma_chan_filter;
237 
238         mmc_data->dma = dma_priv;
239 
240         /*
241          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
242          * bus width mode.
243          */
244         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
245 
246         /*
247          * All SDHI blocks support SDIO IRQ signalling.
248          */
249         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
250 
251         /*
252          * All SDHI have CMD12 controll bit
253          */
254         mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL;
255 
256         /*
257          * All SDHI need SDIO_INFO1 reserved bit
258          */
259         mmc_data->flags |= TMIO_MMC_SDIO_STATUS_QUIRK;
260 
261         /*
262          * All SDHI have DMA control register
263          */
264         mmc_data->flags |= TMIO_MMC_HAVE_CTL_DMA_REG;
265 
266         if (of_id && of_id->data) {
267                 const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
268                 mmc_data->flags |= of_data->tmio_flags;
269                 mmc_data->capabilities |= of_data->capabilities;
270                 mmc_data->capabilities2 |= of_data->capabilities2;
271                 dma_priv->dma_rx_offset = of_data->dma_rx_offset;
272         }
273 
274         /* SD control register space size is 0x100, 0x200 for bus_shift=1 */
275         mmc_data->bus_shift = resource_size(res) >> 9;
276 
277         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
278         if (ret < 0)
279                 goto eprobe;
280 
281         /*
282          * FIXME:
283          * this Workaround can be more clever method
284          */
285         ver = sd_ctrl_read16(host, CTL_VERSION);
286         if (ver == 0xCB0D)
287                 sd_ctrl_write16(host, EXT_ACC, 1);
288 
289         /*
290          * Allow one or more specific (named) ISRs or
291          * one or more multiplexed (un-named) ISRs.
292          */
293 
294         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
295         if (irq >= 0) {
296                 multiplexed_isr = false;
297                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0,
298                                   dev_name(&pdev->dev), host);
299                 if (ret)
300                         goto eirq;
301         }
302 
303         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
304         if (irq >= 0) {
305                 multiplexed_isr = false;
306                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0,
307                                   dev_name(&pdev->dev), host);
308                 if (ret)
309                         goto eirq;
310         }
311 
312         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
313         if (irq >= 0) {
314                 multiplexed_isr = false;
315                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0,
316                                   dev_name(&pdev->dev), host);
317                 if (ret)
318                         goto eirq;
319         } else if (!multiplexed_isr) {
320                 dev_err(&pdev->dev,
321                         "Principal SD-card IRQ is missing among named interrupts\n");
322                 ret = irq;
323                 goto eirq;
324         }
325 
326         if (multiplexed_isr) {
327                 while (1) {
328                         irq = platform_get_irq(pdev, i);
329                         if (irq < 0)
330                                 break;
331                         i++;
332                         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
333                                           dev_name(&pdev->dev), host);
334                         if (ret)
335                                 goto eirq;
336                 }
337 
338                 /* There must be at least one IRQ source */
339                 if (!i) {
340                         ret = irq;
341                         goto eirq;
342                 }
343         }
344 
345         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
346                  mmc_hostname(host->mmc), (unsigned long)
347                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
348                  host->mmc->f_max / 1000000);
349 
350         return ret;
351 
352 eirq:
353         tmio_mmc_host_remove(host);
354 eprobe:
355 eclkget:
356         if (p && p->cleanup)
357                 p->cleanup(pdev);
358         return ret;
359 }
360 
361 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
362 {
363         struct mmc_host *mmc = platform_get_drvdata(pdev);
364         struct tmio_mmc_host *host = mmc_priv(mmc);
365         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
366 
367         tmio_mmc_host_remove(host);
368 
369         if (p && p->cleanup)
370                 p->cleanup(pdev);
371 
372         return 0;
373 }
374 
375 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
376         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
377                         pm_runtime_force_resume)
378         SET_PM_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
379                         tmio_mmc_host_runtime_resume,
380                         NULL)
381 };
382 
383 static struct platform_driver sh_mobile_sdhi_driver = {
384         .driver         = {
385                 .name   = "sh_mobile_sdhi",
386                 .pm     = &tmio_mmc_dev_pm_ops,
387                 .of_match_table = sh_mobile_sdhi_of_match,
388         },
389         .probe          = sh_mobile_sdhi_probe,
390         .remove         = sh_mobile_sdhi_remove,
391 };
392 
393 module_platform_driver(sh_mobile_sdhi_driver);
394 
395 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
396 MODULE_AUTHOR("Magnus Damm");
397 MODULE_LICENSE("GPL v2");
398 MODULE_ALIAS("platform:sh_mobile_sdhi");
399 

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