Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney...
[~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/platform_device.h>
27 #include <linux/mmc/host.h>
28 #include <linux/mmc/sh_mobile_sdhi.h>
29 #include <linux/mfd/tmio.h>
30 #include <linux/sh_dma.h>
31 #include <linux/delay.h>
32
33 #include "tmio_mmc.h"
34
35 struct sh_mobile_sdhi {
36         struct clk *clk;
37         struct tmio_mmc_data mmc_data;
38         struct sh_dmae_slave param_tx;
39         struct sh_dmae_slave param_rx;
40         struct tmio_mmc_dma dma_priv;
41 };
42
43 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
44 {
45         struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
46         struct tmio_mmc_host *host = mmc_priv(mmc);
47         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
48         int ret = clk_enable(priv->clk);
49         if (ret < 0)
50                 return ret;
51
52         *f = clk_get_rate(priv->clk);
53         return 0;
54 }
55
56 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
57 {
58         struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
59         struct tmio_mmc_host *host = mmc_priv(mmc);
60         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
61         clk_disable(priv->clk);
62 }
63
64 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
65 {
66         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
67
68         p->set_pwr(pdev, state);
69 }
70
71 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
72 {
73         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
74
75         return p->get_cd(pdev);
76 }
77
78 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
79 {
80         int timeout = 1000;
81
82         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
83                 udelay(1);
84
85         if (!timeout) {
86                 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
87                 return -EBUSY;
88         }
89
90         return 0;
91 }
92
93 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
94 {
95         switch (addr)
96         {
97         case CTL_SD_CMD:
98         case CTL_STOP_INTERNAL_ACTION:
99         case CTL_XFER_BLK_COUNT:
100         case CTL_SD_CARD_CLK_CTL:
101         case CTL_SD_XFER_LEN:
102         case CTL_SD_MEM_CARD_OPT:
103         case CTL_TRANSACTION_CTL:
104         case CTL_DMA_ENABLE:
105                 return sh_mobile_sdhi_wait_idle(host);
106         }
107
108         return 0;
109 }
110
111 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
112 {
113         mmc_detect_change(dev_get_drvdata(&pdev->dev), msecs_to_jiffies(100));
114 }
115
116 static const struct sh_mobile_sdhi_ops sdhi_ops = {
117         .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
118 };
119
120 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
121 {
122         struct sh_mobile_sdhi *priv;
123         struct tmio_mmc_data *mmc_data;
124         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
125         struct tmio_mmc_host *host;
126         int irq, ret, i = 0;
127         bool multiplexed_isr = true;
128
129         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
130         if (priv == NULL) {
131                 dev_err(&pdev->dev, "kzalloc failed\n");
132                 return -ENOMEM;
133         }
134
135         mmc_data = &priv->mmc_data;
136
137         if (p) {
138                 p->pdata = mmc_data;
139                 if (p->init) {
140                         ret = p->init(pdev, &sdhi_ops);
141                         if (ret)
142                                 goto einit;
143                 }
144         }
145
146         priv->clk = clk_get(&pdev->dev, NULL);
147         if (IS_ERR(priv->clk)) {
148                 ret = PTR_ERR(priv->clk);
149                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
150                 goto eclkget;
151         }
152
153         mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
154         mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
155         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
156         if (p) {
157                 mmc_data->flags = p->tmio_flags;
158                 if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
159                         mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
160                 mmc_data->ocr_mask = p->tmio_ocr_mask;
161                 mmc_data->capabilities |= p->tmio_caps;
162                 mmc_data->capabilities2 |= p->tmio_caps2;
163                 mmc_data->cd_gpio = p->cd_gpio;
164                 if (p->set_pwr)
165                         mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
166                 if (p->get_cd)
167                         mmc_data->get_cd = sh_mobile_sdhi_get_cd;
168
169                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
170                         priv->param_tx.shdma_slave.slave_id = p->dma_slave_tx;
171                         priv->param_rx.shdma_slave.slave_id = p->dma_slave_rx;
172                         priv->dma_priv.chan_priv_tx = &priv->param_tx.shdma_slave;
173                         priv->dma_priv.chan_priv_rx = &priv->param_rx.shdma_slave;
174                         priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
175                         mmc_data->dma = &priv->dma_priv;
176                 }
177         }
178
179         /*
180          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
181          * bus width mode.
182          */
183         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
184
185         /*
186          * All SDHI blocks support SDIO IRQ signalling.
187          */
188         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
189
190         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
191         if (ret < 0)
192                 goto eprobe;
193
194         /*
195          * Allow one or more specific (named) ISRs or
196          * one or more multiplexed (un-named) ISRs.
197          */
198
199         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
200         if (irq >= 0) {
201                 multiplexed_isr = false;
202                 ret = request_irq(irq, tmio_mmc_card_detect_irq, 0,
203                                   dev_name(&pdev->dev), host);
204                 if (ret)
205                         goto eirq_card_detect;
206         }
207
208         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
209         if (irq >= 0) {
210                 multiplexed_isr = false;
211                 ret = request_irq(irq, tmio_mmc_sdio_irq, 0,
212                                   dev_name(&pdev->dev), host);
213                 if (ret)
214                         goto eirq_sdio;
215         }
216
217         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
218         if (irq >= 0) {
219                 multiplexed_isr = false;
220                 ret = request_irq(irq, tmio_mmc_sdcard_irq, 0,
221                                   dev_name(&pdev->dev), host);
222                 if (ret)
223                         goto eirq_sdcard;
224         } else if (!multiplexed_isr) {
225                 dev_err(&pdev->dev,
226                         "Principal SD-card IRQ is missing among named interrupts\n");
227                 ret = irq;
228                 goto eirq_sdcard;
229         }
230
231         if (multiplexed_isr) {
232                 while (1) {
233                         irq = platform_get_irq(pdev, i);
234                         if (irq < 0)
235                                 break;
236                         i++;
237                         ret = request_irq(irq, tmio_mmc_irq, 0,
238                                           dev_name(&pdev->dev), host);
239                         if (ret)
240                                 goto eirq_multiplexed;
241                 }
242
243                 /* There must be at least one IRQ source */
244                 if (!i)
245                         goto eirq_multiplexed;
246         }
247
248         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
249                  mmc_hostname(host->mmc), (unsigned long)
250                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
251                  host->mmc->f_max / 1000000);
252
253         return ret;
254
255 eirq_multiplexed:
256         while (i--) {
257                 irq = platform_get_irq(pdev, i);
258                 free_irq(irq, host);
259         }
260 eirq_sdcard:
261         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
262         if (irq >= 0)
263                 free_irq(irq, host);
264 eirq_sdio:
265         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
266         if (irq >= 0)
267                 free_irq(irq, host);
268 eirq_card_detect:
269         tmio_mmc_host_remove(host);
270 eprobe:
271         clk_put(priv->clk);
272 eclkget:
273         if (p && p->cleanup)
274                 p->cleanup(pdev);
275 einit:
276         kfree(priv);
277         return ret;
278 }
279
280 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
281 {
282         struct mmc_host *mmc = platform_get_drvdata(pdev);
283         struct tmio_mmc_host *host = mmc_priv(mmc);
284         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
285         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
286         int i = 0, irq;
287
288         if (p)
289                 p->pdata = NULL;
290
291         tmio_mmc_host_remove(host);
292
293         while (1) {
294                 irq = platform_get_irq(pdev, i++);
295                 if (irq < 0)
296                         break;
297                 free_irq(irq, host);
298         }
299
300         clk_put(priv->clk);
301
302         if (p && p->cleanup)
303                 p->cleanup(pdev);
304
305         kfree(priv);
306
307         return 0;
308 }
309
310 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
311         .suspend = tmio_mmc_host_suspend,
312         .resume = tmio_mmc_host_resume,
313         .runtime_suspend = tmio_mmc_host_runtime_suspend,
314         .runtime_resume = tmio_mmc_host_runtime_resume,
315 };
316
317 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
318         { .compatible = "renesas,shmobile-sdhi" },
319         { }
320 };
321 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
322
323 static struct platform_driver sh_mobile_sdhi_driver = {
324         .driver         = {
325                 .name   = "sh_mobile_sdhi",
326                 .owner  = THIS_MODULE,
327                 .pm     = &tmio_mmc_dev_pm_ops,
328                 .of_match_table = sh_mobile_sdhi_of_match,
329         },
330         .probe          = sh_mobile_sdhi_probe,
331         .remove         = sh_mobile_sdhi_remove,
332 };
333
334 module_platform_driver(sh_mobile_sdhi_driver);
335
336 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
337 MODULE_AUTHOR("Magnus Damm");
338 MODULE_LICENSE("GPL v2");
339 MODULE_ALIAS("platform:sh_mobile_sdhi");