Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

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/mfd/tmio.h>
 32 #include <linux/sh_dma.h>
 33 #include <linux/delay.h>
 34 #include <linux/pinctrl/consumer.h>
 35 #include <linux/pinctrl/pinctrl-state.h>
 36 #include <linux/regulator/consumer.h>
 37 
 38 #include "tmio_mmc.h"
 39 
 40 #define EXT_ACC           0xe4
 41 
 42 #define host_to_priv(host) container_of((host)->pdata, struct sh_mobile_sdhi, mmc_data)
 43 
 44 struct sh_mobile_sdhi_of_data {
 45         unsigned long tmio_flags;
 46         unsigned long capabilities;
 47         unsigned long capabilities2;
 48         enum dma_slave_buswidth dma_buswidth;
 49         dma_addr_t dma_rx_offset;
 50         unsigned bus_shift;
 51 };
 52 
 53 static const struct sh_mobile_sdhi_of_data of_default_cfg = {
 54         .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
 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_MIN_RCAR2,
 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_MIN_RCAR2,
 74         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
 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-sh73a0", .data = &of_default_cfg, },
 81         { .compatible = "renesas,sdhi-r8a73a4", .data = &of_default_cfg, },
 82         { .compatible = "renesas,sdhi-r8a7740", .data = &of_default_cfg, },
 83         { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
 84         { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
 85         { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
 86         { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
 87         { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
 88         { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
 89         { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
 90         { .compatible = "renesas,sdhi-r8a7795", .data = &of_rcar_gen3_compatible, },
 91         {},
 92 };
 93 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
 94 
 95 struct sh_mobile_sdhi {
 96         struct clk *clk;
 97         struct tmio_mmc_data mmc_data;
 98         struct tmio_mmc_dma dma_priv;
 99         struct pinctrl *pinctrl;
100         struct pinctrl_state *pins_default, *pins_uhs;
101 };
102 
103 static void sh_mobile_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width)
104 {
105         u32 val;
106 
107         /*
108          * see also
109          *      sh_mobile_sdhi_of_data :: dma_buswidth
110          */
111         switch (sd_ctrl_read16(host, CTL_VERSION)) {
112         case 0x490C:
113                 val = (width == 32) ? 0x0001 : 0x0000;
114                 break;
115         case 0xCB0D:
116                 val = (width == 32) ? 0x0000 : 0x0001;
117                 break;
118         case 0xCC10: /* Gen3, SD only */
119         case 0xCD10: /* Gen3, SD + MMC */
120                 if (width == 64)
121                         val = 0x0000;
122                 else if (width == 32)
123                         val = 0x0101;
124                 else
125                         val = 0x0001;
126                 break;
127         default:
128                 /* nothing to do */
129                 return;
130         }
131 
132         sd_ctrl_write16(host, EXT_ACC, val);
133 }
134 
135 static int sh_mobile_sdhi_clk_enable(struct tmio_mmc_host *host)
136 {
137         struct mmc_host *mmc = host->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         /*
144          * The clock driver may not know what maximum frequency
145          * actually works, so it should be set with the max-frequency
146          * property which will already have been read to f_max.  If it
147          * was missing, assume the current frequency is the maximum.
148          */
149         if (!mmc->f_max)
150                 mmc->f_max = clk_get_rate(priv->clk);
151 
152         /*
153          * Minimum frequency is the minimum input clock frequency
154          * divided by our maximum divider.
155          */
156         mmc->f_min = max(clk_round_rate(priv->clk, 1) / 512, 1L);
157 
158         /* enable 16bit data access on SDBUF as default */
159         sh_mobile_sdhi_sdbuf_width(host, 16);
160 
161         return 0;
162 }
163 
164 static unsigned int sh_mobile_sdhi_clk_update(struct tmio_mmc_host *host,
165                                               unsigned int new_clock)
166 {
167         struct sh_mobile_sdhi *priv = host_to_priv(host);
168         unsigned int freq, diff, best_freq = 0, diff_min = ~0;
169         int i, ret;
170 
171         /* tested only on RCar Gen2+ currently; may work for others */
172         if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
173                 return clk_get_rate(priv->clk);
174 
175         /*
176          * We want the bus clock to be as close as possible to, but no
177          * greater than, new_clock.  As we can divide by 1 << i for
178          * any i in [0, 9] we want the input clock to be as close as
179          * possible, but no greater than, new_clock << i.
180          */
181         for (i = min(9, ilog2(UINT_MAX / new_clock)); i >= 0; i--) {
182                 freq = clk_round_rate(priv->clk, new_clock << i);
183                 if (freq > (new_clock << i)) {
184                         /* Too fast; look for a slightly slower option */
185                         freq = clk_round_rate(priv->clk,
186                                               (new_clock << i) / 4 * 3);
187                         if (freq > (new_clock << i))
188                                 continue;
189                 }
190 
191                 diff = new_clock - (freq >> i);
192                 if (diff <= diff_min) {
193                         best_freq = freq;
194                         diff_min = diff;
195                 }
196         }
197 
198         ret = clk_set_rate(priv->clk, best_freq);
199 
200         return ret == 0 ? best_freq : clk_get_rate(priv->clk);
201 }
202 
203 static void sh_mobile_sdhi_clk_disable(struct tmio_mmc_host *host)
204 {
205         struct sh_mobile_sdhi *priv = host_to_priv(host);
206 
207         clk_disable_unprepare(priv->clk);
208 }
209 
210 static int sh_mobile_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
211                                                       struct mmc_ios *ios)
212 {
213         struct tmio_mmc_host *host = mmc_priv(mmc);
214         struct sh_mobile_sdhi *priv = host_to_priv(host);
215         struct pinctrl_state *pin_state;
216         int ret;
217 
218         switch (ios->signal_voltage) {
219         case MMC_SIGNAL_VOLTAGE_330:
220                 pin_state = priv->pins_default;
221                 break;
222         case MMC_SIGNAL_VOLTAGE_180:
223                 pin_state = priv->pins_uhs;
224                 break;
225         default:
226                 return -EINVAL;
227         }
228 
229         /*
230          * If anything is missing, assume signal voltage is fixed at
231          * 3.3V and succeed/fail accordingly.
232          */
233         if (IS_ERR(priv->pinctrl) || IS_ERR(pin_state))
234                 return ios->signal_voltage ==
235                         MMC_SIGNAL_VOLTAGE_330 ? 0 : -EINVAL;
236 
237         ret = mmc_regulator_set_vqmmc(host->mmc, ios);
238         if (ret)
239                 return ret;
240 
241         return pinctrl_select_state(priv->pinctrl, pin_state);
242 }
243 
244 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
245 {
246         int timeout = 1000;
247 
248         while (--timeout && !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS)
249                               & TMIO_STAT_SCLKDIVEN))
250                 udelay(1);
251 
252         if (!timeout) {
253                 dev_warn(&host->pdev->dev, "timeout waiting for SD bus idle\n");
254                 return -EBUSY;
255         }
256 
257         return 0;
258 }
259 
260 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
261 {
262         switch (addr)
263         {
264         case CTL_SD_CMD:
265         case CTL_STOP_INTERNAL_ACTION:
266         case CTL_XFER_BLK_COUNT:
267         case CTL_SD_CARD_CLK_CTL:
268         case CTL_SD_XFER_LEN:
269         case CTL_SD_MEM_CARD_OPT:
270         case CTL_TRANSACTION_CTL:
271         case CTL_DMA_ENABLE:
272         case EXT_ACC:
273                 return sh_mobile_sdhi_wait_idle(host);
274         }
275 
276         return 0;
277 }
278 
279 static int sh_mobile_sdhi_multi_io_quirk(struct mmc_card *card,
280                                          unsigned int direction, int blk_size)
281 {
282         /*
283          * In Renesas controllers, when performing a
284          * multiple block read of one or two blocks,
285          * depending on the timing with which the
286          * response register is read, the response
287          * value may not be read properly.
288          * Use single block read for this HW bug
289          */
290         if ((direction == MMC_DATA_READ) &&
291             blk_size == 2)
292                 return 1;
293 
294         return blk_size;
295 }
296 
297 static void sh_mobile_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
298 {
299         sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? 2 : 0);
300 
301         /* enable 32bit access if DMA mode if possibile */
302         sh_mobile_sdhi_sdbuf_width(host, enable ? 32 : 16);
303 }
304 
305 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
306 {
307         const struct of_device_id *of_id =
308                 of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
309         struct sh_mobile_sdhi *priv;
310         struct tmio_mmc_data *mmc_data;
311         struct tmio_mmc_data *mmd = pdev->dev.platform_data;
312         struct tmio_mmc_host *host;
313         struct resource *res;
314         int irq, ret, i = 0;
315         struct tmio_mmc_dma *dma_priv;
316 
317         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
318         if (!res)
319                 return -EINVAL;
320 
321         priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
322         if (!priv)
323                 return -ENOMEM;
324 
325         mmc_data = &priv->mmc_data;
326         dma_priv = &priv->dma_priv;
327 
328         priv->clk = devm_clk_get(&pdev->dev, NULL);
329         if (IS_ERR(priv->clk)) {
330                 ret = PTR_ERR(priv->clk);
331                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
332                 goto eprobe;
333         }
334 
335         priv->pinctrl = devm_pinctrl_get(&pdev->dev);
336         if (!IS_ERR(priv->pinctrl)) {
337                 priv->pins_default = pinctrl_lookup_state(priv->pinctrl,
338                                                 PINCTRL_STATE_DEFAULT);
339                 priv->pins_uhs = pinctrl_lookup_state(priv->pinctrl,
340                                                 "state_uhs");
341         }
342 
343         host = tmio_mmc_host_alloc(pdev);
344         if (!host) {
345                 ret = -ENOMEM;
346                 goto eprobe;
347         }
348 
349         if (of_id && of_id->data) {
350                 const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
351 
352                 mmc_data->flags |= of_data->tmio_flags;
353                 mmc_data->capabilities |= of_data->capabilities;
354                 mmc_data->capabilities2 |= of_data->capabilities2;
355                 mmc_data->dma_rx_offset = of_data->dma_rx_offset;
356                 dma_priv->dma_buswidth = of_data->dma_buswidth;
357                 host->bus_shift = of_data->bus_shift;
358         }
359 
360         host->dma               = dma_priv;
361         host->write16_hook      = sh_mobile_sdhi_write16_hook;
362         host->clk_enable        = sh_mobile_sdhi_clk_enable;
363         host->clk_update        = sh_mobile_sdhi_clk_update;
364         host->clk_disable       = sh_mobile_sdhi_clk_disable;
365         host->multi_io_quirk    = sh_mobile_sdhi_multi_io_quirk;
366         host->start_signal_voltage_switch = sh_mobile_sdhi_start_signal_voltage_switch;
367 
368         /* Orginally registers were 16 bit apart, could be 32 or 64 nowadays */
369         if (!host->bus_shift && resource_size(res) > 0x100) /* old way to determine the shift */
370                 host->bus_shift = 1;
371 
372         if (mmd)
373                 *mmc_data = *mmd;
374 
375         dma_priv->filter = shdma_chan_filter;
376         dma_priv->enable = sh_mobile_sdhi_enable_dma;
377 
378         mmc_data->alignment_shift = 1; /* 2-byte alignment */
379         mmc_data->capabilities |= MMC_CAP_MMC_HIGHSPEED;
380 
381         /*
382          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
383          * bus width mode.
384          */
385         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
386 
387         /*
388          * All SDHI blocks support SDIO IRQ signalling.
389          */
390         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
391 
392         /*
393          * All SDHI have CMD12 controll bit
394          */
395         mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL;
396 
397         /*
398          * All SDHI need SDIO_INFO1 reserved bit
399          */
400         mmc_data->flags |= TMIO_MMC_SDIO_STATUS_QUIRK;
401 
402         ret = tmio_mmc_host_probe(host, mmc_data);
403         if (ret < 0)
404                 goto efree;
405 
406         while (1) {
407                 irq = platform_get_irq(pdev, i);
408                 if (irq < 0)
409                         break;
410                 i++;
411                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
412                                   dev_name(&pdev->dev), host);
413                 if (ret)
414                         goto eirq;
415         }
416 
417         /* There must be at least one IRQ source */
418         if (!i) {
419                 ret = irq;
420                 goto eirq;
421         }
422 
423         dev_info(&pdev->dev, "%s base at 0x%08lx max clock rate %u MHz\n",
424                  mmc_hostname(host->mmc), (unsigned long)
425                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
426                  host->mmc->f_max / 1000000);
427 
428         return ret;
429 
430 eirq:
431         tmio_mmc_host_remove(host);
432 efree:
433         tmio_mmc_host_free(host);
434 eprobe:
435         return ret;
436 }
437 
438 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
439 {
440         struct mmc_host *mmc = platform_get_drvdata(pdev);
441         struct tmio_mmc_host *host = mmc_priv(mmc);
442 
443         tmio_mmc_host_remove(host);
444 
445         return 0;
446 }
447 
448 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
449         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
450                         pm_runtime_force_resume)
451         SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
452                         tmio_mmc_host_runtime_resume,
453                         NULL)
454 };
455 
456 static struct platform_driver sh_mobile_sdhi_driver = {
457         .driver         = {
458                 .name   = "sh_mobile_sdhi",
459                 .pm     = &tmio_mmc_dev_pm_ops,
460                 .of_match_table = sh_mobile_sdhi_of_match,
461         },
462         .probe          = sh_mobile_sdhi_probe,
463         .remove         = sh_mobile_sdhi_remove,
464 };
465 
466 module_platform_driver(sh_mobile_sdhi_driver);
467 
468 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
469 MODULE_AUTHOR("Magnus Damm");
470 MODULE_LICENSE("GPL v2");
471 MODULE_ALIAS("platform:sh_mobile_sdhi");
472 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us