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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 };
 43 
 44 static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
 45         {
 46                 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
 47         },
 48 };
 49 
 50 static const struct sh_mobile_sdhi_of_data of_rcar_gen1_compatible = {
 51         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE,
 52         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
 53 };
 54 
 55 static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = {
 56         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE,
 57         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
 58         .capabilities2  = MMC_CAP2_NO_MULTI_READ,
 59 };
 60 
 61 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
 62         { .compatible = "renesas,sdhi-shmobile" },
 63         { .compatible = "renesas,sdhi-sh7372" },
 64         { .compatible = "renesas,sdhi-sh73a0", .data = &sh_mobile_sdhi_of_cfg[0], },
 65         { .compatible = "renesas,sdhi-r8a73a4", .data = &sh_mobile_sdhi_of_cfg[0], },
 66         { .compatible = "renesas,sdhi-r8a7740", .data = &sh_mobile_sdhi_of_cfg[0], },
 67         { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
 68         { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
 69         { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
 70         { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
 71         {},
 72 };
 73 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
 74 
 75 struct sh_mobile_sdhi {
 76         struct clk *clk;
 77         struct tmio_mmc_data mmc_data;
 78         struct tmio_mmc_dma dma_priv;
 79 };
 80 
 81 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
 82 {
 83         struct mmc_host *mmc = platform_get_drvdata(pdev);
 84         struct tmio_mmc_host *host = mmc_priv(mmc);
 85         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 86         int ret = clk_prepare_enable(priv->clk);
 87         if (ret < 0)
 88                 return ret;
 89 
 90         *f = clk_get_rate(priv->clk);
 91         return 0;
 92 }
 93 
 94 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
 95 {
 96         struct mmc_host *mmc = platform_get_drvdata(pdev);
 97         struct tmio_mmc_host *host = mmc_priv(mmc);
 98         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 99         clk_disable_unprepare(priv->clk);
100 }
101 
102 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
103 {
104         int timeout = 1000;
105 
106         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
107                 udelay(1);
108 
109         if (!timeout) {
110                 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
111                 return -EBUSY;
112         }
113 
114         return 0;
115 }
116 
117 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
118 {
119         switch (addr)
120         {
121         case CTL_SD_CMD:
122         case CTL_STOP_INTERNAL_ACTION:
123         case CTL_XFER_BLK_COUNT:
124         case CTL_SD_CARD_CLK_CTL:
125         case CTL_SD_XFER_LEN:
126         case CTL_SD_MEM_CARD_OPT:
127         case CTL_TRANSACTION_CTL:
128         case CTL_DMA_ENABLE:
129                 return sh_mobile_sdhi_wait_idle(host);
130         }
131 
132         return 0;
133 }
134 
135 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
136 {
137         mmc_detect_change(platform_get_drvdata(pdev), msecs_to_jiffies(100));
138 }
139 
140 static const struct sh_mobile_sdhi_ops sdhi_ops = {
141         .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
142 };
143 
144 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
145 {
146         const struct of_device_id *of_id =
147                 of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
148         struct sh_mobile_sdhi *priv;
149         struct tmio_mmc_data *mmc_data;
150         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
151         struct tmio_mmc_host *host;
152         struct resource *res;
153         int irq, ret, i = 0;
154         bool multiplexed_isr = true;
155         struct tmio_mmc_dma *dma_priv;
156         u16 ver;
157 
158         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
159         if (!res)
160                 return -EINVAL;
161 
162         priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
163         if (priv == NULL) {
164                 dev_err(&pdev->dev, "kzalloc failed\n");
165                 return -ENOMEM;
166         }
167 
168         mmc_data = &priv->mmc_data;
169         dma_priv = &priv->dma_priv;
170 
171         if (p) {
172                 if (p->init) {
173                         ret = p->init(pdev, &sdhi_ops);
174                         if (ret)
175                                 return ret;
176                 }
177         }
178 
179         priv->clk = devm_clk_get(&pdev->dev, NULL);
180         if (IS_ERR(priv->clk)) {
181                 ret = PTR_ERR(priv->clk);
182                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
183                 goto eclkget;
184         }
185 
186         mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
187         mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
188         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
189         mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
190         if (p) {
191                 mmc_data->flags = p->tmio_flags;
192                 mmc_data->ocr_mask = p->tmio_ocr_mask;
193                 mmc_data->capabilities |= p->tmio_caps;
194                 mmc_data->capabilities2 |= p->tmio_caps2;
195                 mmc_data->cd_gpio = p->cd_gpio;
196 
197                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
198                         /*
199                          * Yes, we have to provide slave IDs twice to TMIO:
200                          * once as a filter parameter and once for channel
201                          * configuration as an explicit slave ID
202                          */
203                         dma_priv->chan_priv_tx = (void *)p->dma_slave_tx;
204                         dma_priv->chan_priv_rx = (void *)p->dma_slave_rx;
205                         dma_priv->slave_id_tx = p->dma_slave_tx;
206                         dma_priv->slave_id_rx = p->dma_slave_rx;
207                 }
208         }
209 
210         dma_priv->alignment_shift = 1; /* 2-byte alignment */
211         dma_priv->filter = shdma_chan_filter;
212 
213         mmc_data->dma = dma_priv;
214 
215         /*
216          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
217          * bus width mode.
218          */
219         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
220 
221         /*
222          * All SDHI blocks support SDIO IRQ signalling.
223          */
224         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
225 
226         if (of_id && of_id->data) {
227                 const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
228                 mmc_data->flags |= of_data->tmio_flags;
229                 mmc_data->capabilities |= of_data->capabilities;
230                 mmc_data->capabilities2 |= of_data->capabilities2;
231         }
232 
233         /* SD control register space size is 0x100, 0x200 for bus_shift=1 */
234         mmc_data->bus_shift = resource_size(res) >> 9;
235 
236         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
237         if (ret < 0)
238                 goto eprobe;
239 
240         /*
241          * FIXME:
242          * this Workaround can be more clever method
243          */
244         ver = sd_ctrl_read16(host, CTL_VERSION);
245         if (ver == 0xCB0D)
246                 sd_ctrl_write16(host, EXT_ACC, 1);
247 
248         /*
249          * Allow one or more specific (named) ISRs or
250          * one or more multiplexed (un-named) ISRs.
251          */
252 
253         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
254         if (irq >= 0) {
255                 multiplexed_isr = false;
256                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0,
257                                   dev_name(&pdev->dev), host);
258                 if (ret)
259                         goto eirq;
260         }
261 
262         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
263         if (irq >= 0) {
264                 multiplexed_isr = false;
265                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0,
266                                   dev_name(&pdev->dev), host);
267                 if (ret)
268                         goto eirq;
269         }
270 
271         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
272         if (irq >= 0) {
273                 multiplexed_isr = false;
274                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0,
275                                   dev_name(&pdev->dev), host);
276                 if (ret)
277                         goto eirq;
278         } else if (!multiplexed_isr) {
279                 dev_err(&pdev->dev,
280                         "Principal SD-card IRQ is missing among named interrupts\n");
281                 ret = irq;
282                 goto eirq;
283         }
284 
285         if (multiplexed_isr) {
286                 while (1) {
287                         irq = platform_get_irq(pdev, i);
288                         if (irq < 0)
289                                 break;
290                         i++;
291                         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
292                                           dev_name(&pdev->dev), host);
293                         if (ret)
294                                 goto eirq;
295                 }
296 
297                 /* There must be at least one IRQ source */
298                 if (!i) {
299                         ret = irq;
300                         goto eirq;
301                 }
302         }
303 
304         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
305                  mmc_hostname(host->mmc), (unsigned long)
306                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
307                  host->mmc->f_max / 1000000);
308 
309         return ret;
310 
311 eirq:
312         tmio_mmc_host_remove(host);
313 eprobe:
314 eclkget:
315         if (p && p->cleanup)
316                 p->cleanup(pdev);
317         return ret;
318 }
319 
320 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
321 {
322         struct mmc_host *mmc = platform_get_drvdata(pdev);
323         struct tmio_mmc_host *host = mmc_priv(mmc);
324         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
325 
326         tmio_mmc_host_remove(host);
327 
328         if (p && p->cleanup)
329                 p->cleanup(pdev);
330 
331         return 0;
332 }
333 
334 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
335         SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_host_suspend, tmio_mmc_host_resume)
336         SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
337                         tmio_mmc_host_runtime_resume,
338                         NULL)
339 };
340 
341 static struct platform_driver sh_mobile_sdhi_driver = {
342         .driver         = {
343                 .name   = "sh_mobile_sdhi",
344                 .owner  = THIS_MODULE,
345                 .pm     = &tmio_mmc_dev_pm_ops,
346                 .of_match_table = sh_mobile_sdhi_of_match,
347         },
348         .probe          = sh_mobile_sdhi_probe,
349         .remove         = sh_mobile_sdhi_remove,
350 };
351 
352 module_platform_driver(sh_mobile_sdhi_driver);
353 
354 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
355 MODULE_AUTHOR("Magnus Damm");
356 MODULE_LICENSE("GPL v2");
357 MODULE_ALIAS("platform:sh_mobile_sdhi");
358 

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