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/platform_device.h>
 25#include <linux/mmc/host.h>
 26#include <linux/mmc/sh_mobile_sdhi.h>
 27#include <linux/mfd/tmio.h>
 28#include <linux/sh_dma.h>
 29#include <linux/delay.h>
 30
 31#include "tmio_mmc.h"
 32
 33struct sh_mobile_sdhi {
 34	struct clk *clk;
 35	struct tmio_mmc_data mmc_data;
 36	struct sh_dmae_slave param_tx;
 37	struct sh_dmae_slave param_rx;
 38	struct tmio_mmc_dma dma_priv;
 39};
 40
 41static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
 42{
 43	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 44
 45	if (p && p->set_pwr)
 46		p->set_pwr(pdev, state);
 47}
 48
 49static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
 50{
 51	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 52
 53	if (p && p->get_cd)
 54		return p->get_cd(pdev);
 55	else
 56		return -ENOSYS;
 57}
 58
 59static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
 60{
 61	int timeout = 1000;
 62
 63	while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
 64		udelay(1);
 65
 66	if (!timeout) {
 67		dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
 68		return -EBUSY;
 69	}
 70
 71	return 0;
 72}
 73
 74static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
 75{
 76	switch (addr)
 77	{
 78	case CTL_SD_CMD:
 79	case CTL_STOP_INTERNAL_ACTION:
 80	case CTL_XFER_BLK_COUNT:
 81	case CTL_SD_CARD_CLK_CTL:
 82	case CTL_SD_XFER_LEN:
 83	case CTL_SD_MEM_CARD_OPT:
 84	case CTL_TRANSACTION_CTL:
 85	case CTL_DMA_ENABLE:
 86		return sh_mobile_sdhi_wait_idle(host);
 87	}
 88
 89	return 0;
 90}
 91
 92static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
 93{
 94	struct sh_mobile_sdhi *priv;
 95	struct tmio_mmc_data *mmc_data;
 96	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 97	struct tmio_mmc_host *host;
 98	char clk_name[8];
 99	int i, irq, ret;
100
101	priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
102	if (priv == NULL) {
103		dev_err(&pdev->dev, "kzalloc failed\n");
104		return -ENOMEM;
105	}
106
107	mmc_data = &priv->mmc_data;
108	p->pdata = mmc_data;
109
110	snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
111	priv->clk = clk_get(&pdev->dev, clk_name);
112	if (IS_ERR(priv->clk)) {
113		dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
114		ret = PTR_ERR(priv->clk);
115		goto eclkget;
116	}
117
118	clk_enable(priv->clk);
119
120	mmc_data->hclk = clk_get_rate(priv->clk);
121	mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
122	mmc_data->get_cd = sh_mobile_sdhi_get_cd;
123	mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
124	if (p) {
125		mmc_data->flags = p->tmio_flags;
126		if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
127			mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
128		mmc_data->ocr_mask = p->tmio_ocr_mask;
129		mmc_data->capabilities |= p->tmio_caps;
130
131		if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
132			priv->param_tx.slave_id = p->dma_slave_tx;
133			priv->param_rx.slave_id = p->dma_slave_rx;
134			priv->dma_priv.chan_priv_tx = &priv->param_tx;
135			priv->dma_priv.chan_priv_rx = &priv->param_rx;
136			priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
137			mmc_data->dma = &priv->dma_priv;
138		}
139	}
140
141	/*
142	 * All SDHI blocks support 2-byte and larger block sizes in 4-bit
143	 * bus width mode.
144	 */
145	mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
146
147	/*
148	 * All SDHI blocks support SDIO IRQ signalling.
149	 */
150	mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
151
152	ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
153	if (ret < 0)
154		goto eprobe;
155
156	for (i = 0; i < 3; i++) {
157		irq = platform_get_irq(pdev, i);
158		if (irq < 0) {
159			if (i) {
160				continue;
161			} else {
162				ret = irq;
163				goto eirq;
164			}
165		}
166		ret = request_irq(irq, tmio_mmc_irq, 0,
167				  dev_name(&pdev->dev), host);
168		if (ret) {
169			while (i--) {
170				irq = platform_get_irq(pdev, i);
171				if (irq >= 0)
172					free_irq(irq, host);
173			}
174			goto eirq;
175		}
176	}
177	dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
178		 mmc_hostname(host->mmc), (unsigned long)
179		 (platform_get_resource(pdev,IORESOURCE_MEM, 0)->start),
180		 mmc_data->hclk / 1000000);
181
182	return ret;
183
184eirq:
185	tmio_mmc_host_remove(host);
186eprobe:
187	clk_disable(priv->clk);
188	clk_put(priv->clk);
189eclkget:
190	kfree(priv);
191	return ret;
192}
193
194static int sh_mobile_sdhi_remove(struct platform_device *pdev)
195{
196	struct mmc_host *mmc = platform_get_drvdata(pdev);
197	struct tmio_mmc_host *host = mmc_priv(mmc);
198	struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
199	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
200	int i, irq;
201
202	p->pdata = NULL;
203
204	tmio_mmc_host_remove(host);
205
206	for (i = 0; i < 3; i++) {
207		irq = platform_get_irq(pdev, i);
208		if (irq >= 0)
209			free_irq(irq, host);
210	}
211
212	clk_disable(priv->clk);
213	clk_put(priv->clk);
214	kfree(priv);
215
216	return 0;
217}
218
219static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
220	.suspend = tmio_mmc_host_suspend,
221	.resume = tmio_mmc_host_resume,
222	.runtime_suspend = tmio_mmc_host_runtime_suspend,
223	.runtime_resume = tmio_mmc_host_runtime_resume,
224};
225
226static struct platform_driver sh_mobile_sdhi_driver = {
227	.driver		= {
228		.name	= "sh_mobile_sdhi",
229		.owner	= THIS_MODULE,
230		.pm	= &tmio_mmc_dev_pm_ops,
231	},
232	.probe		= sh_mobile_sdhi_probe,
233	.remove		= __devexit_p(sh_mobile_sdhi_remove),
234};
235
236static int __init sh_mobile_sdhi_init(void)
237{
238	return platform_driver_register(&sh_mobile_sdhi_driver);
239}
240
241static void __exit sh_mobile_sdhi_exit(void)
242{
243	platform_driver_unregister(&sh_mobile_sdhi_driver);
244}
245
246module_init(sh_mobile_sdhi_init);
247module_exit(sh_mobile_sdhi_exit);
248
249MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
250MODULE_AUTHOR("Magnus Damm");
251MODULE_LICENSE("GPL v2");
252MODULE_ALIAS("platform:sh_mobile_sdhi");