drivers/mmc/host/sh_mobile_sdhi.c - kernel/mindspeed - Git at Google

 /*
  * SuperH Mobile SDHI
  *
  * Copyright (C) 2009 Magnus Damm
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * Based on "Compaq ASIC3 support":
  *
  * Copyright 2001 Compaq Computer Corporation.
  * Copyright 2004-2005 Phil Blundell
  * Copyright 2007-2008 OpenedHand Ltd.
  *
  * Authors: Phil Blundell <pb@handhelds.org>,
  *	    Samuel Ortiz <sameo@openedhand.com>
  *
  */

 #include <linux/kernel.h>
 #include <linux/clk.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/sh_mobile_sdhi.h>
 #include <linux/mfd/tmio.h>
 #include <linux/sh_dma.h>
 #include <linux/delay.h>

 #include "tmio_mmc.h"

 struct sh_mobile_sdhi {
 	struct clk *clk;
 	struct tmio_mmc_data mmc_data;
 	struct sh_dmae_slave param_tx;
 	struct sh_dmae_slave param_rx;
 	struct tmio_mmc_dma dma_priv;
 };

 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
 {
 	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;

 	if (p && p->set_pwr)
 		p->set_pwr(pdev, state);
 }

 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
 {
 	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;

 	if (p && p->get_cd)
 		return p->get_cd(pdev);
 	else
 		return -ENOSYS;
 }

 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
 {
 	int timeout = 1000;

 	while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
 		udelay(1);

 	if (!timeout) {
 		dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
 		return -EBUSY;
 	}

 	return 0;
 }

 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
 {
 	switch (addr)
 	{
 	case CTL_SD_CMD:
 	case CTL_STOP_INTERNAL_ACTION:
 	case CTL_XFER_BLK_COUNT:
 	case CTL_SD_CARD_CLK_CTL:
 	case CTL_SD_XFER_LEN:
 	case CTL_SD_MEM_CARD_OPT:
 	case CTL_TRANSACTION_CTL:
 	case CTL_DMA_ENABLE:
 		return sh_mobile_sdhi_wait_idle(host);
 	}

 	return 0;
 }

 static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
 {
 	struct sh_mobile_sdhi *priv;
 	struct tmio_mmc_data *mmc_data;
 	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 	struct tmio_mmc_host *host;
 	char clk_name[8];
 	int irq, ret, i = 0;
 	bool multiplexed_isr = true;

 	priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 	if (priv == NULL) {
 		dev_err(&pdev->dev, "kzalloc failed\n");
 		return -ENOMEM;
 	}

 	mmc_data = &priv->mmc_data;
 	p->pdata = mmc_data;

 	snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
 	priv->clk = clk_get(&pdev->dev, clk_name);
 	if (IS_ERR(priv->clk)) {
 		dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 		ret = PTR_ERR(priv->clk);
 		goto eclkget;
 	}

 	clk_enable(priv->clk);

 	mmc_data->hclk = clk_get_rate(priv->clk);
 	mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
 	mmc_data->get_cd = sh_mobile_sdhi_get_cd;
 	mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 	if (p) {
 		mmc_data->flags = p->tmio_flags;
 		if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
 			mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
 		mmc_data->ocr_mask = p->tmio_ocr_mask;
 		mmc_data->capabilities |= p->tmio_caps;

 		if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
 			priv->param_tx.slave_id = p->dma_slave_tx;
 			priv->param_rx.slave_id = p->dma_slave_rx;
 			priv->dma_priv.chan_priv_tx = &priv->param_tx;
 			priv->dma_priv.chan_priv_rx = &priv->param_rx;
 			priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
 			mmc_data->dma = &priv->dma_priv;
 		}
 	}

 	/*
 	 * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 	 * bus width mode.
 	 */
 	mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;

 	/*
 	 * All SDHI blocks support SDIO IRQ signalling.
 	 */
 	mmc_data->flags |= TMIO_MMC_SDIO_IRQ;

 	ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
 	if (ret < 0)
 		goto eprobe;

 	/*
 	 * Allow one or more specific (named) ISRs or
 	 * one or more multiplexed (un-named) ISRs.
 	 */

 	irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 	if (irq >= 0) {
 		multiplexed_isr = false;
 		ret = request_irq(irq, tmio_mmc_card_detect_irq, 0,
 				  dev_name(&pdev->dev), host);
 		if (ret)
 			goto eirq_card_detect;
 	}

 	irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 	if (irq >= 0) {
 		multiplexed_isr = false;
 		ret = request_irq(irq, tmio_mmc_sdio_irq, 0,
 				  dev_name(&pdev->dev), host);
 		if (ret)
 			goto eirq_sdio;
 	}

 	irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
 	if (irq >= 0) {
 		multiplexed_isr = false;
 		ret = request_irq(irq, tmio_mmc_sdcard_irq, 0,
 				  dev_name(&pdev->dev), host);
 		if (ret)
 			goto eirq_sdcard;
 	} else if (!multiplexed_isr) {
 		dev_err(&pdev->dev,
 			"Principal SD-card IRQ is missing among named interrupts\n");
 		ret = irq;
 		goto eirq_sdcard;
 	}

 	if (multiplexed_isr) {
 		while (1) {
 			irq = platform_get_irq(pdev, i);
 			if (irq < 0)
 				break;
 			i++;
 			ret = request_irq(irq, tmio_mmc_irq, 0,
 					  dev_name(&pdev->dev), host);
 			if (ret)
 				goto eirq_multiplexed;
 		}

 		/* There must be at least one IRQ source */
 		if (!i)
 			goto eirq_multiplexed;
 	}

 	dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
 		 mmc_hostname(host->mmc), (unsigned long)
 		 (platform_get_resource(pdev,IORESOURCE_MEM, 0)->start),
 		 mmc_data->hclk / 1000000);

 	return ret;

 eirq_multiplexed:
 	while (i--) {
 		irq = platform_get_irq(pdev, i);
 		free_irq(irq, host);
 	}
 eirq_sdcard:
 	irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 	if (irq >= 0)
 		free_irq(irq, host);
 eirq_sdio:
 	irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 	if (irq >= 0)
 		free_irq(irq, host);
 eirq_card_detect:
 	tmio_mmc_host_remove(host);
 eprobe:
 	clk_disable(priv->clk);
 	clk_put(priv->clk);
 eclkget:
 	kfree(priv);
 	return ret;
 }

 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 {
 	struct mmc_host *mmc = platform_get_drvdata(pdev);
 	struct tmio_mmc_host *host = mmc_priv(mmc);
 	struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 	int i = 0, irq;

 	p->pdata = NULL;

 	tmio_mmc_host_remove(host);

 	while (1) {
 		irq = platform_get_irq(pdev, i++);
 		if (irq < 0)
 			break;
 		free_irq(irq, host);
 	}

 	clk_disable(priv->clk);
 	clk_put(priv->clk);
 	kfree(priv);

 	return 0;
 }

 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 	.suspend = tmio_mmc_host_suspend,
 	.resume = tmio_mmc_host_resume,
 	.runtime_suspend = tmio_mmc_host_runtime_suspend,
 	.runtime_resume = tmio_mmc_host_runtime_resume,
 };

 static struct platform_driver sh_mobile_sdhi_driver = {
 	.driver		= {
 		.name	= "sh_mobile_sdhi",
 		.owner	= THIS_MODULE,
 		.pm	= &tmio_mmc_dev_pm_ops,
 	},
 	.probe		= sh_mobile_sdhi_probe,
 	.remove		= __devexit_p(sh_mobile_sdhi_remove),
 };

 static int __init sh_mobile_sdhi_init(void)
 {
 	return platform_driver_register(&sh_mobile_sdhi_driver);
 }

 static void __exit sh_mobile_sdhi_exit(void)
 {
 	platform_driver_unregister(&sh_mobile_sdhi_driver);
 }

 module_init(sh_mobile_sdhi_init);
 module_exit(sh_mobile_sdhi_exit);

 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 MODULE_AUTHOR("Magnus Damm");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:sh_mobile_sdhi");
	/*
	* SuperH Mobile SDHI
	*
	* Copyright (C) 2009 Magnus Damm
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* Based on "Compaq ASIC3 support":
	*
	* Copyright 2001 Compaq Computer Corporation.
	* Copyright 2004-2005 Phil Blundell
	* Copyright 2007-2008 OpenedHand Ltd.
	*
	* Authors: Phil Blundell <pb@handhelds.org>,
	* Samuel Ortiz <sameo@openedhand.com>
	*
	*/

	#include <linux/kernel.h>
	#include <linux/clk.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/mmc/host.h>
	#include <linux/mmc/sh_mobile_sdhi.h>
	#include <linux/mfd/tmio.h>
	#include <linux/sh_dma.h>
	#include <linux/delay.h>

	#include "tmio_mmc.h"

	struct sh_mobile_sdhi {
	struct clk *clk;
	struct tmio_mmc_data mmc_data;
	struct sh_dmae_slave param_tx;
	struct sh_dmae_slave param_rx;
	struct tmio_mmc_dma dma_priv;
	};

	static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
	{
	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;

	if (p && p->set_pwr)
	p->set_pwr(pdev, state);
	}

	static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
	{
	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;

	if (p && p->get_cd)
	return p->get_cd(pdev);
	else
	return -ENOSYS;
	}

	static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
	{
	int timeout = 1000;

	while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
	udelay(1);

	if (!timeout) {
	dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
	return -EBUSY;
	}

	return 0;
	}

	static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
	{
	switch (addr)
	{
	case CTL_SD_CMD:
	case CTL_STOP_INTERNAL_ACTION:
	case CTL_XFER_BLK_COUNT:
	case CTL_SD_CARD_CLK_CTL:
	case CTL_SD_XFER_LEN:
	case CTL_SD_MEM_CARD_OPT:
	case CTL_TRANSACTION_CTL:
	case CTL_DMA_ENABLE:
	return sh_mobile_sdhi_wait_idle(host);
	}

	return 0;
	}

	static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
	{
	struct sh_mobile_sdhi *priv;
	struct tmio_mmc_data *mmc_data;
	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
	struct tmio_mmc_host *host;
	char clk_name[8];
	int irq, ret, i = 0;
	bool multiplexed_isr = true;

	priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
	if (priv == NULL) {
	dev_err(&pdev->dev, "kzalloc failed\n");
	return -ENOMEM;
	}

	mmc_data = &priv->mmc_data;
	p->pdata = mmc_data;

	snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
	priv->clk = clk_get(&pdev->dev, clk_name);
	if (IS_ERR(priv->clk)) {
	dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
	ret = PTR_ERR(priv->clk);
	goto eclkget;
	}

	clk_enable(priv->clk);

	mmc_data->hclk = clk_get_rate(priv->clk);
	mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
	mmc_data->get_cd = sh_mobile_sdhi_get_cd;
	mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
	if (p) {
	mmc_data->flags = p->tmio_flags;
	if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
	mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
	mmc_data->ocr_mask = p->tmio_ocr_mask;
	mmc_data->capabilities \|= p->tmio_caps;

	if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
	priv->param_tx.slave_id = p->dma_slave_tx;
	priv->param_rx.slave_id = p->dma_slave_rx;
	priv->dma_priv.chan_priv_tx = &priv->param_tx;
	priv->dma_priv.chan_priv_rx = &priv->param_rx;
	priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
	mmc_data->dma = &priv->dma_priv;
	}
	}

	/*
	* All SDHI blocks support 2-byte and larger block sizes in 4-bit
	* bus width mode.
	*/
	mmc_data->flags \|= TMIO_MMC_BLKSZ_2BYTES;

	/*
	* All SDHI blocks support SDIO IRQ signalling.
	*/
	mmc_data->flags \|= TMIO_MMC_SDIO_IRQ;

	ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
	if (ret < 0)
	goto eprobe;

	/*
	* Allow one or more specific (named) ISRs or
	* one or more multiplexed (un-named) ISRs.
	*/

	irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
	if (irq >= 0) {
	multiplexed_isr = false;
	ret = request_irq(irq, tmio_mmc_card_detect_irq, 0,
	dev_name(&pdev->dev), host);
	if (ret)
	goto eirq_card_detect;
	}

	irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
	if (irq >= 0) {
	multiplexed_isr = false;
	ret = request_irq(irq, tmio_mmc_sdio_irq, 0,
	dev_name(&pdev->dev), host);
	if (ret)
	goto eirq_sdio;
	}

	irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
	if (irq >= 0) {
	multiplexed_isr = false;
	ret = request_irq(irq, tmio_mmc_sdcard_irq, 0,
	dev_name(&pdev->dev), host);
	if (ret)
	goto eirq_sdcard;
	} else if (!multiplexed_isr) {
	dev_err(&pdev->dev,
	"Principal SD-card IRQ is missing among named interrupts\n");
	ret = irq;
	goto eirq_sdcard;
	}

	if (multiplexed_isr) {
	while (1) {
	irq = platform_get_irq(pdev, i);
	if (irq < 0)
	break;
	i++;
	ret = request_irq(irq, tmio_mmc_irq, 0,
	dev_name(&pdev->dev), host);
	if (ret)
	goto eirq_multiplexed;
	}

	/* There must be at least one IRQ source */
	if (!i)
	goto eirq_multiplexed;
	}

	dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
	mmc_hostname(host->mmc), (unsigned long)
	(platform_get_resource(pdev,IORESOURCE_MEM, 0)->start),
	mmc_data->hclk / 1000000);

	return ret;

	eirq_multiplexed:
	while (i--) {
	irq = platform_get_irq(pdev, i);
	free_irq(irq, host);
	}
	eirq_sdcard:
	irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
	if (irq >= 0)
	free_irq(irq, host);
	eirq_sdio:
	irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
	if (irq >= 0)
	free_irq(irq, host);
	eirq_card_detect:
	tmio_mmc_host_remove(host);
	eprobe:
	clk_disable(priv->clk);
	clk_put(priv->clk);
	eclkget:
	kfree(priv);
	return ret;
	}

	static int sh_mobile_sdhi_remove(struct platform_device *pdev)
	{
	struct mmc_host *mmc = platform_get_drvdata(pdev);
	struct tmio_mmc_host *host = mmc_priv(mmc);
	struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
	int i = 0, irq;

	p->pdata = NULL;

	tmio_mmc_host_remove(host);

	while (1) {
	irq = platform_get_irq(pdev, i++);
	if (irq < 0)
	break;
	free_irq(irq, host);
	}

	clk_disable(priv->clk);
	clk_put(priv->clk);
	kfree(priv);

	return 0;
	}

	static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
	.suspend = tmio_mmc_host_suspend,
	.resume = tmio_mmc_host_resume,
	.runtime_suspend = tmio_mmc_host_runtime_suspend,
	.runtime_resume = tmio_mmc_host_runtime_resume,
	};

	static struct platform_driver sh_mobile_sdhi_driver = {
	.driver = {
	.name = "sh_mobile_sdhi",
	.owner = THIS_MODULE,
	.pm = &tmio_mmc_dev_pm_ops,
	},
	.probe = sh_mobile_sdhi_probe,
	.remove = __devexit_p(sh_mobile_sdhi_remove),
	};

	static int __init sh_mobile_sdhi_init(void)
	{
	return platform_driver_register(&sh_mobile_sdhi_driver);
	}

	static void __exit sh_mobile_sdhi_exit(void)
	{
	platform_driver_unregister(&sh_mobile_sdhi_driver);
	}

	module_init(sh_mobile_sdhi_init);
	module_exit(sh_mobile_sdhi_exit);

	MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
	MODULE_AUTHOR("Magnus Damm");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:sh_mobile_sdhi");