Merge tag 'mmc-updates-for-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel...
[~shefty/rdma-dev.git] / 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 struct sh_mobile_sdhi_of_data {
37         unsigned long tmio_flags;
38 };
39
40 static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
41         {
42                 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
43         },
44 };
45
46 struct sh_mobile_sdhi {
47         struct clk *clk;
48         struct tmio_mmc_data mmc_data;
49         struct sh_dmae_slave param_tx;
50         struct sh_dmae_slave param_rx;
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 = dev_get_drvdata(&pdev->dev);
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_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 = dev_get_drvdata(&pdev->dev);
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(priv->clk);
73 }
74
75 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
76 {
77         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
78
79         p->set_pwr(pdev, state);
80 }
81
82 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
83 {
84         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
85
86         return p->get_cd(pdev);
87 }
88
89 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
90 {
91         int timeout = 1000;
92
93         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
94                 udelay(1);
95
96         if (!timeout) {
97                 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
98                 return -EBUSY;
99         }
100
101         return 0;
102 }
103
104 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
105 {
106         switch (addr)
107         {
108         case CTL_SD_CMD:
109         case CTL_STOP_INTERNAL_ACTION:
110         case CTL_XFER_BLK_COUNT:
111         case CTL_SD_CARD_CLK_CTL:
112         case CTL_SD_XFER_LEN:
113         case CTL_SD_MEM_CARD_OPT:
114         case CTL_TRANSACTION_CTL:
115         case CTL_DMA_ENABLE:
116                 return sh_mobile_sdhi_wait_idle(host);
117         }
118
119         return 0;
120 }
121
122 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
123 {
124         mmc_detect_change(dev_get_drvdata(&pdev->dev), msecs_to_jiffies(100));
125 }
126
127 static const struct sh_mobile_sdhi_ops sdhi_ops = {
128         .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
129 };
130
131 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
132         { .compatible = "renesas,shmobile-sdhi" },
133         { .compatible = "renesas,sh7372-sdhi" },
134         { .compatible = "renesas,r8a7740-sdhi", .data = &sh_mobile_sdhi_of_cfg[0], },
135         {},
136 };
137 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
138
139 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
140 {
141         const struct of_device_id *of_id =
142                 of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
143         struct sh_mobile_sdhi *priv;
144         struct tmio_mmc_data *mmc_data;
145         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
146         struct tmio_mmc_host *host;
147         int irq, ret, i = 0;
148         bool multiplexed_isr = true;
149
150         priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
151         if (priv == NULL) {
152                 dev_err(&pdev->dev, "kzalloc failed\n");
153                 return -ENOMEM;
154         }
155
156         mmc_data = &priv->mmc_data;
157
158         if (p) {
159                 if (p->init) {
160                         ret = p->init(pdev, &sdhi_ops);
161                         if (ret)
162                                 return ret;
163                 }
164         }
165
166         priv->clk = devm_clk_get(&pdev->dev, NULL);
167         if (IS_ERR(priv->clk)) {
168                 ret = PTR_ERR(priv->clk);
169                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
170                 goto eclkget;
171         }
172
173         mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
174         mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
175         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
176         mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
177         if (p) {
178                 mmc_data->flags = p->tmio_flags;
179                 mmc_data->ocr_mask = p->tmio_ocr_mask;
180                 mmc_data->capabilities |= p->tmio_caps;
181                 mmc_data->capabilities2 |= p->tmio_caps2;
182                 mmc_data->cd_gpio = p->cd_gpio;
183                 if (p->set_pwr)
184                         mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
185                 if (p->get_cd)
186                         mmc_data->get_cd = sh_mobile_sdhi_get_cd;
187
188                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
189                         priv->param_tx.shdma_slave.slave_id = p->dma_slave_tx;
190                         priv->param_rx.shdma_slave.slave_id = p->dma_slave_rx;
191                         priv->dma_priv.chan_priv_tx = &priv->param_tx.shdma_slave;
192                         priv->dma_priv.chan_priv_rx = &priv->param_rx.shdma_slave;
193                         priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
194                         mmc_data->dma = &priv->dma_priv;
195                 }
196         }
197
198         /*
199          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
200          * bus width mode.
201          */
202         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
203
204         /*
205          * All SDHI blocks support SDIO IRQ signalling.
206          */
207         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
208
209         if (of_id && of_id->data) {
210                 const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
211                 mmc_data->flags |= of_data->tmio_flags;
212         }
213
214         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
215         if (ret < 0)
216                 goto eprobe;
217
218         /*
219          * Allow one or more specific (named) ISRs or
220          * one or more multiplexed (un-named) ISRs.
221          */
222
223         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
224         if (irq >= 0) {
225                 multiplexed_isr = false;
226                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0,
227                                   dev_name(&pdev->dev), host);
228                 if (ret)
229                         goto eirq;
230         }
231
232         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
233         if (irq >= 0) {
234                 multiplexed_isr = false;
235                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0,
236                                   dev_name(&pdev->dev), host);
237                 if (ret)
238                         goto eirq;
239         }
240
241         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
242         if (irq >= 0) {
243                 multiplexed_isr = false;
244                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0,
245                                   dev_name(&pdev->dev), host);
246                 if (ret)
247                         goto eirq;
248         } else if (!multiplexed_isr) {
249                 dev_err(&pdev->dev,
250                         "Principal SD-card IRQ is missing among named interrupts\n");
251                 ret = irq;
252                 goto eirq;
253         }
254
255         if (multiplexed_isr) {
256                 while (1) {
257                         irq = platform_get_irq(pdev, i);
258                         if (irq < 0)
259                                 break;
260                         i++;
261                         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
262                                           dev_name(&pdev->dev), host);
263                         if (ret)
264                                 goto eirq;
265                 }
266
267                 /* There must be at least one IRQ source */
268                 if (!i)
269                         goto eirq;
270         }
271
272         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
273                  mmc_hostname(host->mmc), (unsigned long)
274                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
275                  host->mmc->f_max / 1000000);
276
277         return ret;
278
279 eirq:
280         tmio_mmc_host_remove(host);
281 eprobe:
282 eclkget:
283         if (p && p->cleanup)
284                 p->cleanup(pdev);
285         return ret;
286 }
287
288 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
289 {
290         struct mmc_host *mmc = platform_get_drvdata(pdev);
291         struct tmio_mmc_host *host = mmc_priv(mmc);
292         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
293
294         tmio_mmc_host_remove(host);
295
296         if (p && p->cleanup)
297                 p->cleanup(pdev);
298
299         return 0;
300 }
301
302 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
303         .suspend = tmio_mmc_host_suspend,
304         .resume = tmio_mmc_host_resume,
305         .runtime_suspend = tmio_mmc_host_runtime_suspend,
306         .runtime_resume = tmio_mmc_host_runtime_resume,
307 };
308
309 static struct platform_driver sh_mobile_sdhi_driver = {
310         .driver         = {
311                 .name   = "sh_mobile_sdhi",
312                 .owner  = THIS_MODULE,
313                 .pm     = &tmio_mmc_dev_pm_ops,
314                 .of_match_table = sh_mobile_sdhi_of_match,
315         },
316         .probe          = sh_mobile_sdhi_probe,
317         .remove         = sh_mobile_sdhi_remove,
318 };
319
320 module_platform_driver(sh_mobile_sdhi_driver);
321
322 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
323 MODULE_AUTHOR("Magnus Damm");
324 MODULE_LICENSE("GPL v2");
325 MODULE_ALIAS("platform:sh_mobile_sdhi");