4 * Copyright (C) 2009 Magnus Damm
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.
10 * Based on "Compaq ASIC3 support":
12 * Copyright 2001 Compaq Computer Corporation.
13 * Copyright 2004-2005 Phil Blundell
14 * Copyright 2007-2008 OpenedHand Ltd.
16 * Authors: Phil Blundell <pb@handhelds.org>,
17 * Samuel Ortiz <sameo@openedhand.com>
21 #include <linux/kernel.h>
22 #include <linux/clk.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/platform_device.h>
26 #include <linux/mmc/host.h>
27 #include <linux/mmc/sh_mobile_sdhi.h>
28 #include <linux/mfd/tmio.h>
29 #include <linux/sh_dma.h>
30 #include <linux/delay.h>
34 struct sh_mobile_sdhi {
36 struct tmio_mmc_data mmc_data;
37 struct sh_dmae_slave param_tx;
38 struct sh_dmae_slave param_rx;
39 struct tmio_mmc_dma dma_priv;
42 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
44 struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
45 struct tmio_mmc_host *host = mmc_priv(mmc);
46 struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
47 int ret = clk_enable(priv->clk);
51 *f = clk_get_rate(priv->clk);
55 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
57 struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
58 struct tmio_mmc_host *host = mmc_priv(mmc);
59 struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
60 clk_disable(priv->clk);
63 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
65 struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
67 p->set_pwr(pdev, state);
70 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
72 struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
74 return p->get_cd(pdev);
77 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
81 while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
85 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
92 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
97 case CTL_STOP_INTERNAL_ACTION:
98 case CTL_XFER_BLK_COUNT:
99 case CTL_SD_CARD_CLK_CTL:
100 case CTL_SD_XFER_LEN:
101 case CTL_SD_MEM_CARD_OPT:
102 case CTL_TRANSACTION_CTL:
104 return sh_mobile_sdhi_wait_idle(host);
110 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
112 mmc_detect_change(dev_get_drvdata(&pdev->dev), msecs_to_jiffies(100));
115 static const struct sh_mobile_sdhi_ops sdhi_ops = {
116 .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
119 static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
121 struct sh_mobile_sdhi *priv;
122 struct tmio_mmc_data *mmc_data;
123 struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
124 struct tmio_mmc_host *host;
127 bool multiplexed_isr = true;
129 priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
131 dev_err(&pdev->dev, "kzalloc failed\n");
135 mmc_data = &priv->mmc_data;
139 ret = p->init(pdev, &sdhi_ops);
144 snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
145 priv->clk = clk_get(&pdev->dev, clk_name);
146 if (IS_ERR(priv->clk)) {
147 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
148 ret = PTR_ERR(priv->clk);
153 mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
155 mmc_data->get_cd = sh_mobile_sdhi_get_cd;
156 mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
157 mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
158 mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
160 mmc_data->flags = p->tmio_flags;
161 if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
162 mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
163 mmc_data->ocr_mask = p->tmio_ocr_mask;
164 mmc_data->capabilities |= p->tmio_caps;
165 mmc_data->capabilities2 |= p->tmio_caps2;
166 mmc_data->cd_gpio = p->cd_gpio;
168 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
169 priv->param_tx.slave_id = p->dma_slave_tx;
170 priv->param_rx.slave_id = p->dma_slave_rx;
171 priv->dma_priv.chan_priv_tx = &priv->param_tx;
172 priv->dma_priv.chan_priv_rx = &priv->param_rx;
173 priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
174 mmc_data->dma = &priv->dma_priv;
179 * All SDHI blocks support 2-byte and larger block sizes in 4-bit
182 mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
185 * All SDHI blocks support SDIO IRQ signalling.
187 mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
189 ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
194 * Allow one or more specific (named) ISRs or
195 * one or more multiplexed (un-named) ISRs.
198 irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
200 multiplexed_isr = false;
201 ret = request_irq(irq, tmio_mmc_card_detect_irq, 0,
202 dev_name(&pdev->dev), host);
204 goto eirq_card_detect;
207 irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
209 multiplexed_isr = false;
210 ret = request_irq(irq, tmio_mmc_sdio_irq, 0,
211 dev_name(&pdev->dev), host);
216 irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
218 multiplexed_isr = false;
219 ret = request_irq(irq, tmio_mmc_sdcard_irq, 0,
220 dev_name(&pdev->dev), host);
223 } else if (!multiplexed_isr) {
225 "Principal SD-card IRQ is missing among named interrupts\n");
230 if (multiplexed_isr) {
232 irq = platform_get_irq(pdev, i);
236 ret = request_irq(irq, tmio_mmc_irq, 0,
237 dev_name(&pdev->dev), host);
239 goto eirq_multiplexed;
242 /* There must be at least one IRQ source */
244 goto eirq_multiplexed;
247 dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
248 mmc_hostname(host->mmc), (unsigned long)
249 (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
250 mmc_data->hclk / 1000000);
256 irq = platform_get_irq(pdev, i);
260 irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
264 irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
268 tmio_mmc_host_remove(host);
279 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
281 struct mmc_host *mmc = platform_get_drvdata(pdev);
282 struct tmio_mmc_host *host = mmc_priv(mmc);
283 struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
284 struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
289 tmio_mmc_host_remove(host);
292 irq = platform_get_irq(pdev, i++);
308 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
309 .suspend = tmio_mmc_host_suspend,
310 .resume = tmio_mmc_host_resume,
311 .runtime_suspend = tmio_mmc_host_runtime_suspend,
312 .runtime_resume = tmio_mmc_host_runtime_resume,
315 static struct platform_driver sh_mobile_sdhi_driver = {
317 .name = "sh_mobile_sdhi",
318 .owner = THIS_MODULE,
319 .pm = &tmio_mmc_dev_pm_ops,
321 .probe = sh_mobile_sdhi_probe,
322 .remove = __devexit_p(sh_mobile_sdhi_remove),
325 module_platform_driver(sh_mobile_sdhi_driver);
327 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
328 MODULE_AUTHOR("Magnus Damm");
329 MODULE_LICENSE("GPL v2");
330 MODULE_ALIAS("platform:sh_mobile_sdhi");