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Linux/drivers/mmc/host/sh_mobile_sdhi.c

  1 /*
  2  * SuperH Mobile SDHI
  3  *
  4  * Copyright (C) 2016 Sang Engineering, Wolfram Sang
  5  * Copyright (C) 2015-16 Renesas Electronics Corporation
  6  * Copyright (C) 2009 Magnus Damm
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  *
 12  * Based on "Compaq ASIC3 support":
 13  *
 14  * Copyright 2001 Compaq Computer Corporation.
 15  * Copyright 2004-2005 Phil Blundell
 16  * Copyright 2007-2008 OpenedHand Ltd.
 17  *
 18  * Authors: Phil Blundell <pb@handhelds.org>,
 19  *          Samuel Ortiz <sameo@openedhand.com>
 20  *
 21  */
 22 
 23 #include <linux/kernel.h>
 24 #include <linux/clk.h>
 25 #include <linux/slab.h>
 26 #include <linux/mod_devicetable.h>
 27 #include <linux/module.h>
 28 #include <linux/of_device.h>
 29 #include <linux/platform_device.h>
 30 #include <linux/mmc/host.h>
 31 #include <linux/mmc/sh_mobile_sdhi.h>
 32 #include <linux/mfd/tmio.h>
 33 #include <linux/sh_dma.h>
 34 #include <linux/delay.h>
 35 
 36 #include "tmio_mmc.h"
 37 
 38 #define EXT_ACC           0xe4
 39 
 40 #define host_to_priv(host) container_of((host)->pdata, struct sh_mobile_sdhi, mmc_data)
 41 
 42 struct sh_mobile_sdhi_of_data {
 43         unsigned long tmio_flags;
 44         unsigned long capabilities;
 45         unsigned long capabilities2;
 46         enum dma_slave_buswidth dma_buswidth;
 47         dma_addr_t dma_rx_offset;
 48         unsigned bus_shift;
 49 };
 50 
 51 static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
 52         {
 53                 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
 54         },
 55 };
 56 
 57 static const struct sh_mobile_sdhi_of_data of_rcar_gen1_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 };
 62 
 63 static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = {
 64         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
 65                           TMIO_MMC_CLK_ACTUAL | TMIO_MMC_FAST_CLK_CHG,
 66         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
 67         .dma_buswidth   = DMA_SLAVE_BUSWIDTH_4_BYTES,
 68         .dma_rx_offset  = 0x2000,
 69 };
 70 
 71 static const struct sh_mobile_sdhi_of_data of_rcar_gen3_compatible = {
 72         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
 73                           TMIO_MMC_CLK_ACTUAL | TMIO_MMC_FAST_CLK_CHG,
 74         .capabilities   = MMC_CAP_SD_HIGHSPEED,
 75         .bus_shift      = 2,
 76 };
 77 
 78 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
 79         { .compatible = "renesas,sdhi-shmobile" },
 80         { .compatible = "renesas,sdhi-sh7372" },
 81         { .compatible = "renesas,sdhi-sh73a0", .data = &sh_mobile_sdhi_of_cfg[0], },
 82         { .compatible = "renesas,sdhi-r8a73a4", .data = &sh_mobile_sdhi_of_cfg[0], },
 83         { .compatible = "renesas,sdhi-r8a7740", .data = &sh_mobile_sdhi_of_cfg[0], },
 84         { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
 85         { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
 86         { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
 87         { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
 88         { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
 89         { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
 90         { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
 91         { .compatible = "renesas,sdhi-r8a7795", .data = &of_rcar_gen3_compatible, },
 92         {},
 93 };
 94 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
 95 
 96 struct sh_mobile_sdhi {
 97         struct clk *clk;
 98         struct tmio_mmc_data mmc_data;
 99         struct tmio_mmc_dma dma_priv;
100 };
101 
102 static void sh_mobile_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width)
103 {
104         u32 val;
105 
106         /*
107          * see also
108          *      sh_mobile_sdhi_of_data :: dma_buswidth
109          */
110         switch (sd_ctrl_read16(host, CTL_VERSION)) {
111         case 0x490C:
112                 val = (width == 32) ? 0x0001 : 0x0000;
113                 break;
114         case 0xCB0D:
115                 val = (width == 32) ? 0x0000 : 0x0001;
116                 break;
117         case 0xCC10: /* Gen3, SD only */
118         case 0xCD10: /* Gen3, SD + MMC */
119                 if (width == 64)
120                         val = 0x0000;
121                 else if (width == 32)
122                         val = 0x0101;
123                 else
124                         val = 0x0001;
125                 break;
126         default:
127                 /* nothing to do */
128                 return;
129         }
130 
131         sd_ctrl_write16(host, EXT_ACC, val);
132 }
133 
134 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
135 {
136         struct mmc_host *mmc = platform_get_drvdata(pdev);
137         struct tmio_mmc_host *host = mmc_priv(mmc);
138         struct sh_mobile_sdhi *priv = host_to_priv(host);
139         int ret = clk_prepare_enable(priv->clk);
140         if (ret < 0)
141                 return ret;
142 
143         *f = clk_get_rate(priv->clk);
144 
145         /* enable 16bit data access on SDBUF as default */
146         sh_mobile_sdhi_sdbuf_width(host, 16);
147 
148         return 0;
149 }
150 
151 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
152 {
153         struct mmc_host *mmc = platform_get_drvdata(pdev);
154         struct tmio_mmc_host *host = mmc_priv(mmc);
155         struct sh_mobile_sdhi *priv = host_to_priv(host);
156         clk_disable_unprepare(priv->clk);
157 }
158 
159 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
160 {
161         int timeout = 1000;
162 
163         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
164                 udelay(1);
165 
166         if (!timeout) {
167                 dev_warn(&host->pdev->dev, "timeout waiting for SD bus idle\n");
168                 return -EBUSY;
169         }
170 
171         return 0;
172 }
173 
174 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
175 {
176         switch (addr)
177         {
178         case CTL_SD_CMD:
179         case CTL_STOP_INTERNAL_ACTION:
180         case CTL_XFER_BLK_COUNT:
181         case CTL_SD_CARD_CLK_CTL:
182         case CTL_SD_XFER_LEN:
183         case CTL_SD_MEM_CARD_OPT:
184         case CTL_TRANSACTION_CTL:
185         case CTL_DMA_ENABLE:
186         case EXT_ACC:
187                 return sh_mobile_sdhi_wait_idle(host);
188         }
189 
190         return 0;
191 }
192 
193 static int sh_mobile_sdhi_multi_io_quirk(struct mmc_card *card,
194                                          unsigned int direction, int blk_size)
195 {
196         /*
197          * In Renesas controllers, when performing a
198          * multiple block read of one or two blocks,
199          * depending on the timing with which the
200          * response register is read, the response
201          * value may not be read properly.
202          * Use single block read for this HW bug
203          */
204         if ((direction == MMC_DATA_READ) &&
205             blk_size == 2)
206                 return 1;
207 
208         return blk_size;
209 }
210 
211 static void sh_mobile_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
212 {
213         sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? 2 : 0);
214 
215         /* enable 32bit access if DMA mode if possibile */
216         sh_mobile_sdhi_sdbuf_width(host, enable ? 32 : 16);
217 }
218 
219 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
220 {
221         const struct of_device_id *of_id =
222                 of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
223         struct sh_mobile_sdhi *priv;
224         struct tmio_mmc_data *mmc_data;
225         struct tmio_mmc_data *mmd = pdev->dev.platform_data;
226         struct tmio_mmc_host *host;
227         struct resource *res;
228         int irq, ret, i = 0;
229         bool multiplexed_isr = true;
230         struct tmio_mmc_dma *dma_priv;
231 
232         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
233         if (!res)
234                 return -EINVAL;
235 
236         priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
237         if (!priv)
238                 return -ENOMEM;
239 
240         mmc_data = &priv->mmc_data;
241         dma_priv = &priv->dma_priv;
242 
243         priv->clk = devm_clk_get(&pdev->dev, NULL);
244         if (IS_ERR(priv->clk)) {
245                 ret = PTR_ERR(priv->clk);
246                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
247                 goto eprobe;
248         }
249 
250         host = tmio_mmc_host_alloc(pdev);
251         if (!host) {
252                 ret = -ENOMEM;
253                 goto eprobe;
254         }
255 
256         if (of_id && of_id->data) {
257                 const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
258 
259                 mmc_data->flags |= of_data->tmio_flags;
260                 mmc_data->capabilities |= of_data->capabilities;
261                 mmc_data->capabilities2 |= of_data->capabilities2;
262                 mmc_data->dma_rx_offset = of_data->dma_rx_offset;
263                 dma_priv->dma_buswidth = of_data->dma_buswidth;
264                 host->bus_shift = of_data->bus_shift;
265         }
266 
267         host->dma               = dma_priv;
268         host->write16_hook      = sh_mobile_sdhi_write16_hook;
269         host->clk_enable        = sh_mobile_sdhi_clk_enable;
270         host->clk_disable       = sh_mobile_sdhi_clk_disable;
271         host->multi_io_quirk    = sh_mobile_sdhi_multi_io_quirk;
272 
273         /* Orginally registers were 16 bit apart, could be 32 or 64 nowadays */
274         if (!host->bus_shift && resource_size(res) > 0x100) /* old way to determine the shift */
275                 host->bus_shift = 1;
276 
277         if (mmd)
278                 *mmc_data = *mmd;
279 
280         dma_priv->filter = shdma_chan_filter;
281         dma_priv->enable = sh_mobile_sdhi_enable_dma;
282 
283         mmc_data->alignment_shift = 1; /* 2-byte alignment */
284         mmc_data->capabilities |= MMC_CAP_MMC_HIGHSPEED;
285 
286         /*
287          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
288          * bus width mode.
289          */
290         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
291 
292         /*
293          * All SDHI blocks support SDIO IRQ signalling.
294          */
295         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
296 
297         /*
298          * All SDHI have CMD12 controll bit
299          */
300         mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL;
301 
302         /*
303          * All SDHI need SDIO_INFO1 reserved bit
304          */
305         mmc_data->flags |= TMIO_MMC_SDIO_STATUS_QUIRK;
306 
307         ret = tmio_mmc_host_probe(host, mmc_data);
308         if (ret < 0)
309                 goto efree;
310 
311         /*
312          * Allow one or more specific (named) ISRs or
313          * one or more multiplexed (un-named) ISRs.
314          */
315 
316         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
317         if (irq >= 0) {
318                 multiplexed_isr = false;
319                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0,
320                                   dev_name(&pdev->dev), host);
321                 if (ret)
322                         goto eirq;
323         }
324 
325         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
326         if (irq >= 0) {
327                 multiplexed_isr = false;
328                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0,
329                                   dev_name(&pdev->dev), host);
330                 if (ret)
331                         goto eirq;
332         }
333 
334         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
335         if (irq >= 0) {
336                 multiplexed_isr = false;
337                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0,
338                                   dev_name(&pdev->dev), host);
339                 if (ret)
340                         goto eirq;
341         } else if (!multiplexed_isr) {
342                 dev_err(&pdev->dev,
343                         "Principal SD-card IRQ is missing among named interrupts\n");
344                 ret = irq;
345                 goto eirq;
346         }
347 
348         if (multiplexed_isr) {
349                 while (1) {
350                         irq = platform_get_irq(pdev, i);
351                         if (irq < 0)
352                                 break;
353                         i++;
354                         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
355                                           dev_name(&pdev->dev), host);
356                         if (ret)
357                                 goto eirq;
358                 }
359 
360                 /* There must be at least one IRQ source */
361                 if (!i) {
362                         ret = irq;
363                         goto eirq;
364                 }
365         }
366 
367         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
368                  mmc_hostname(host->mmc), (unsigned long)
369                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
370                  host->mmc->f_max / 1000000);
371 
372         return ret;
373 
374 eirq:
375         tmio_mmc_host_remove(host);
376 efree:
377         tmio_mmc_host_free(host);
378 eprobe:
379         return ret;
380 }
381 
382 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
383 {
384         struct mmc_host *mmc = platform_get_drvdata(pdev);
385         struct tmio_mmc_host *host = mmc_priv(mmc);
386 
387         tmio_mmc_host_remove(host);
388 
389         return 0;
390 }
391 
392 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
393         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
394                         pm_runtime_force_resume)
395         SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
396                         tmio_mmc_host_runtime_resume,
397                         NULL)
398 };
399 
400 static struct platform_driver sh_mobile_sdhi_driver = {
401         .driver         = {
402                 .name   = "sh_mobile_sdhi",
403                 .pm     = &tmio_mmc_dev_pm_ops,
404                 .of_match_table = sh_mobile_sdhi_of_match,
405         },
406         .probe          = sh_mobile_sdhi_probe,
407         .remove         = sh_mobile_sdhi_remove,
408 };
409 
410 module_platform_driver(sh_mobile_sdhi_driver);
411 
412 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
413 MODULE_AUTHOR("Magnus Damm");
414 MODULE_LICENSE("GPL v2");
415 MODULE_ALIAS("platform:sh_mobile_sdhi");
416 

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