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

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