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mmc: sh_mobile_sdhi: fix clock frequency printing
[~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 __devinit 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         char clk_name[8];
127         int irq, ret, i = 0;
128         bool multiplexed_isr = true;
129
130         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
131         if (priv == NULL) {
132                 dev_err(&pdev->dev, "kzalloc failed\n");
133                 return -ENOMEM;
134         }
135
136         mmc_data = &priv->mmc_data;
137
138         if (p) {
139                 p->pdata = mmc_data;
140                 if (p->init) {
141                         ret = p->init(pdev, &sdhi_ops);
142                         if (ret)
143                                 goto einit;
144                 }
145         }
146
147         snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
148         priv->clk = clk_get(&pdev->dev, clk_name);
149         if (IS_ERR(priv->clk)) {
150                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
151                 ret = PTR_ERR(priv->clk);
152                 goto eclkget;
153         }
154
155         mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
156         mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
157         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
158         if (p) {
159                 mmc_data->flags = p->tmio_flags;
160                 if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
161                         mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
162                 mmc_data->ocr_mask = p->tmio_ocr_mask;
163                 mmc_data->capabilities |= p->tmio_caps;
164                 mmc_data->capabilities2 |= p->tmio_caps2;
165                 mmc_data->cd_gpio = p->cd_gpio;
166                 if (p->set_pwr)
167                         mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
168                 if (p->get_cd)
169                         mmc_data->get_cd = sh_mobile_sdhi_get_cd;
170
171                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
172                         priv->param_tx.shdma_slave.slave_id = p->dma_slave_tx;
173                         priv->param_rx.shdma_slave.slave_id = p->dma_slave_rx;
174                         priv->dma_priv.chan_priv_tx = &priv->param_tx.shdma_slave;
175                         priv->dma_priv.chan_priv_rx = &priv->param_rx.shdma_slave;
176                         priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
177                         mmc_data->dma = &priv->dma_priv;
178                 }
179         }
180
181         /*
182          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
183          * bus width mode.
184          */
185         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
186
187         /*
188          * All SDHI blocks support SDIO IRQ signalling.
189          */
190         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
191
192         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
193         if (ret < 0)
194                 goto eprobe;
195
196         /*
197          * Allow one or more specific (named) ISRs or
198          * one or more multiplexed (un-named) ISRs.
199          */
200
201         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
202         if (irq >= 0) {
203                 multiplexed_isr = false;
204                 ret = request_irq(irq, tmio_mmc_card_detect_irq, 0,
205                                   dev_name(&pdev->dev), host);
206                 if (ret)
207                         goto eirq_card_detect;
208         }
209
210         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
211         if (irq >= 0) {
212                 multiplexed_isr = false;
213                 ret = request_irq(irq, tmio_mmc_sdio_irq, 0,
214                                   dev_name(&pdev->dev), host);
215                 if (ret)
216                         goto eirq_sdio;
217         }
218
219         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
220         if (irq >= 0) {
221                 multiplexed_isr = false;
222                 ret = request_irq(irq, tmio_mmc_sdcard_irq, 0,
223                                   dev_name(&pdev->dev), host);
224                 if (ret)
225                         goto eirq_sdcard;
226         } else if (!multiplexed_isr) {
227                 dev_err(&pdev->dev,
228                         "Principal SD-card IRQ is missing among named interrupts\n");
229                 ret = irq;
230                 goto eirq_sdcard;
231         }
232
233         if (multiplexed_isr) {
234                 while (1) {
235                         irq = platform_get_irq(pdev, i);
236                         if (irq < 0)
237                                 break;
238                         i++;
239                         ret = request_irq(irq, tmio_mmc_irq, 0,
240                                           dev_name(&pdev->dev), host);
241                         if (ret)
242                                 goto eirq_multiplexed;
243                 }
244
245                 /* There must be at least one IRQ source */
246                 if (!i)
247                         goto eirq_multiplexed;
248         }
249
250         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
251                  mmc_hostname(host->mmc), (unsigned long)
252                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
253                  host->mmc->f_max / 1000000);
254
255         return ret;
256
257 eirq_multiplexed:
258         while (i--) {
259                 irq = platform_get_irq(pdev, i);
260                 free_irq(irq, host);
261         }
262 eirq_sdcard:
263         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
264         if (irq >= 0)
265                 free_irq(irq, host);
266 eirq_sdio:
267         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
268         if (irq >= 0)
269                 free_irq(irq, host);
270 eirq_card_detect:
271         tmio_mmc_host_remove(host);
272 eprobe:
273         clk_put(priv->clk);
274 eclkget:
275         if (p && p->cleanup)
276                 p->cleanup(pdev);
277 einit:
278         kfree(priv);
279         return ret;
280 }
281
282 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
283 {
284         struct mmc_host *mmc = platform_get_drvdata(pdev);
285         struct tmio_mmc_host *host = mmc_priv(mmc);
286         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
287         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
288         int i = 0, irq;
289
290         if (p)
291                 p->pdata = NULL;
292
293         tmio_mmc_host_remove(host);
294
295         while (1) {
296                 irq = platform_get_irq(pdev, i++);
297                 if (irq < 0)
298                         break;
299                 free_irq(irq, host);
300         }
301
302         clk_put(priv->clk);
303
304         if (p && p->cleanup)
305                 p->cleanup(pdev);
306
307         kfree(priv);
308
309         return 0;
310 }
311
312 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
313         .suspend = tmio_mmc_host_suspend,
314         .resume = tmio_mmc_host_resume,
315         .runtime_suspend = tmio_mmc_host_runtime_suspend,
316         .runtime_resume = tmio_mmc_host_runtime_resume,
317 };
318
319 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
320         { .compatible = "renesas,shmobile-sdhi" },
321         { }
322 };
323 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
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         = __devexit_p(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");