2010-05-27 01:42:10 +04:00
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/*
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* drivers/mmc/host/sdhci-spear.c
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*
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* Support of SDHCI platform devices for spear soc family
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*
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* Copyright (C) 2010 ST Microelectronics
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2012-06-20 23:53:02 +04:00
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* Viresh Kumar <viresh.linux@gmail.com>
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2010-05-27 01:42:10 +04:00
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*
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* Inspired by sdhci-pltfm.c
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/highmem.h>
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2011-07-03 23:15:51 +04:00
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#include <linux/module.h>
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2010-05-27 01:42:10 +04:00
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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2012-09-28 14:28:22 +04:00
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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2010-05-27 01:42:10 +04:00
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#include <linux/platform_device.h>
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2011-11-15 14:54:40 +04:00
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#include <linux/pm.h>
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2010-05-27 01:42:10 +04:00
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#include <linux/slab.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/sdhci-spear.h>
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#include <linux/io.h>
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#include "sdhci.h"
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struct spear_sdhci {
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struct clk *clk;
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struct sdhci_plat_data *data;
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};
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/* sdhci ops */
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2013-03-13 22:26:05 +04:00
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static const struct sdhci_ops sdhci_pltfm_ops = {
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2010-05-27 01:42:10 +04:00
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/* Nothing to do for now. */
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};
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/* gpio card detection interrupt handler */
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static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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struct sdhci_host *host = platform_get_drvdata(pdev);
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struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
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unsigned long gpio_irq_type;
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int val;
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val = gpio_get_value(sdhci->data->card_int_gpio);
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/* val == 1 -> card removed, val == 0 -> card inserted */
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/* if card removed - set irq for low level, else vice versa */
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gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
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2011-03-28 19:49:12 +04:00
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irq_set_irq_type(irq, gpio_irq_type);
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2010-05-27 01:42:10 +04:00
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if (sdhci->data->card_power_gpio >= 0) {
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if (!sdhci->data->power_always_enb) {
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/* if card inserted, give power, otherwise remove it */
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val = sdhci->data->power_active_high ? !val : val ;
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gpio_set_value(sdhci->data->card_power_gpio, val);
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}
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}
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/* inform sdhci driver about card insertion/removal */
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tasklet_schedule(&host->card_tasklet);
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return IRQ_HANDLED;
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}
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2012-09-28 14:28:22 +04:00
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#ifdef CONFIG_OF
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2012-11-19 22:23:06 +04:00
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static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
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2012-09-28 14:28:22 +04:00
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{
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struct device_node *np = pdev->dev.of_node;
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struct sdhci_plat_data *pdata = NULL;
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int cd_gpio;
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cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
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if (!gpio_is_valid(cd_gpio))
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cd_gpio = -1;
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/* If pdata is required */
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if (cd_gpio != -1) {
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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dev_err(&pdev->dev, "DT: kzalloc failed\n");
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return ERR_PTR(-ENOMEM);
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}
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}
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pdata->card_int_gpio = cd_gpio;
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return pdata;
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}
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#else
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2012-11-19 22:23:06 +04:00
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static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
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2012-09-28 14:28:22 +04:00
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{
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return ERR_PTR(-ENOSYS);
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}
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#endif
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2012-11-19 22:23:06 +04:00
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static int sdhci_probe(struct platform_device *pdev)
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2010-05-27 01:42:10 +04:00
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{
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2012-09-28 14:28:22 +04:00
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struct device_node *np = pdev->dev.of_node;
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2010-05-27 01:42:10 +04:00
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struct sdhci_host *host;
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struct resource *iomem;
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struct spear_sdhci *sdhci;
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int ret;
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iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!iomem) {
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ret = -ENOMEM;
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dev_dbg(&pdev->dev, "memory resource not defined\n");
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goto err;
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}
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2012-03-27 07:10:35 +04:00
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if (!devm_request_mem_region(&pdev->dev, iomem->start,
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resource_size(iomem), "spear-sdhci")) {
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2010-05-27 01:42:10 +04:00
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ret = -EBUSY;
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dev_dbg(&pdev->dev, "cannot request region\n");
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goto err;
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}
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2012-03-27 07:10:35 +04:00
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sdhci = devm_kzalloc(&pdev->dev, sizeof(*sdhci), GFP_KERNEL);
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2010-05-27 01:42:10 +04:00
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if (!sdhci) {
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ret = -ENOMEM;
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dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
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2012-03-27 07:10:35 +04:00
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goto err;
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2010-05-27 01:42:10 +04:00
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}
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/* clk enable */
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sdhci->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(sdhci->clk)) {
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ret = PTR_ERR(sdhci->clk);
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dev_dbg(&pdev->dev, "Error getting clock\n");
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2012-03-27 07:10:35 +04:00
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goto err;
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2010-05-27 01:42:10 +04:00
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}
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2012-09-28 14:28:23 +04:00
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ret = clk_prepare_enable(sdhci->clk);
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2010-05-27 01:42:10 +04:00
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if (ret) {
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dev_dbg(&pdev->dev, "Error enabling clock\n");
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2012-03-27 07:10:35 +04:00
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goto put_clk;
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2010-05-27 01:42:10 +04:00
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}
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2012-11-08 19:09:09 +04:00
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ret = clk_set_rate(sdhci->clk, 50000000);
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if (ret)
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dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
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clk_get_rate(sdhci->clk));
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2012-09-28 14:28:22 +04:00
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if (np) {
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sdhci->data = sdhci_probe_config_dt(pdev);
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if (IS_ERR(sdhci->data)) {
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dev_err(&pdev->dev, "DT: Failed to get pdata\n");
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return -ENODEV;
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}
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} else {
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sdhci->data = dev_get_platdata(&pdev->dev);
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}
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2010-05-27 01:42:10 +04:00
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pdev->dev.platform_data = sdhci;
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if (pdev->dev.parent)
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host = sdhci_alloc_host(pdev->dev.parent, 0);
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else
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host = sdhci_alloc_host(&pdev->dev, 0);
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if (IS_ERR(host)) {
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ret = PTR_ERR(host);
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dev_dbg(&pdev->dev, "error allocating host\n");
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2012-03-27 07:10:35 +04:00
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goto disable_clk;
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2010-05-27 01:42:10 +04:00
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}
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host->hw_name = "sdhci";
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host->ops = &sdhci_pltfm_ops;
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host->irq = platform_get_irq(pdev, 0);
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host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
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2012-03-27 07:10:35 +04:00
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host->ioaddr = devm_ioremap(&pdev->dev, iomem->start,
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resource_size(iomem));
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2010-05-27 01:42:10 +04:00
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if (!host->ioaddr) {
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ret = -ENOMEM;
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dev_dbg(&pdev->dev, "failed to remap registers\n");
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2012-03-27 07:10:35 +04:00
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goto free_host;
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2010-05-27 01:42:10 +04:00
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}
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ret = sdhci_add_host(host);
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if (ret) {
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dev_dbg(&pdev->dev, "error adding host\n");
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2012-03-27 07:10:35 +04:00
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goto free_host;
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2010-05-27 01:42:10 +04:00
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}
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platform_set_drvdata(pdev, host);
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/*
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* It is optional to use GPIOs for sdhci Power control & sdhci card
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* interrupt detection. If sdhci->data is NULL, then use original sdhci
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* lines otherwise GPIO lines.
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* If GPIO is selected for power control, then power should be disabled
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* after card removal and should be enabled when card insertion
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* interrupt occurs
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*/
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if (!sdhci->data)
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return 0;
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if (sdhci->data->card_power_gpio >= 0) {
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int val = 0;
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2012-03-27 07:10:35 +04:00
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ret = devm_gpio_request(&pdev->dev,
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sdhci->data->card_power_gpio, "sdhci");
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2010-05-27 01:42:10 +04:00
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if (ret < 0) {
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dev_dbg(&pdev->dev, "gpio request fail: %d\n",
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sdhci->data->card_power_gpio);
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2012-03-27 07:10:35 +04:00
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goto set_drvdata;
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2010-05-27 01:42:10 +04:00
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}
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if (sdhci->data->power_always_enb)
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val = sdhci->data->power_active_high;
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else
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val = !sdhci->data->power_active_high;
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ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
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if (ret) {
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dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
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sdhci->data->card_power_gpio);
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2012-03-27 07:10:35 +04:00
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goto set_drvdata;
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2010-05-27 01:42:10 +04:00
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}
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}
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if (sdhci->data->card_int_gpio >= 0) {
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2012-03-27 07:10:35 +04:00
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ret = devm_gpio_request(&pdev->dev, sdhci->data->card_int_gpio,
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"sdhci");
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2010-05-27 01:42:10 +04:00
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if (ret < 0) {
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dev_dbg(&pdev->dev, "gpio request fail: %d\n",
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sdhci->data->card_int_gpio);
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2012-03-27 07:10:35 +04:00
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goto set_drvdata;
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2010-05-27 01:42:10 +04:00
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}
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ret = gpio_direction_input(sdhci->data->card_int_gpio);
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if (ret) {
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dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
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sdhci->data->card_int_gpio);
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2012-03-27 07:10:35 +04:00
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goto set_drvdata;
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2010-05-27 01:42:10 +04:00
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}
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2012-03-27 07:10:35 +04:00
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ret = devm_request_irq(&pdev->dev,
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gpio_to_irq(sdhci->data->card_int_gpio),
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2010-05-27 01:42:10 +04:00
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sdhci_gpio_irq, IRQF_TRIGGER_LOW,
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mmc_hostname(host->mmc), pdev);
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if (ret) {
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dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
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sdhci->data->card_int_gpio);
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2012-03-27 07:10:35 +04:00
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goto set_drvdata;
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2010-05-27 01:42:10 +04:00
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}
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}
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return 0;
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2012-03-27 07:10:35 +04:00
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set_drvdata:
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2010-05-27 01:42:10 +04:00
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sdhci_remove_host(host, 1);
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2012-03-27 07:10:35 +04:00
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free_host:
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2010-05-27 01:42:10 +04:00
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sdhci_free_host(host);
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2012-03-27 07:10:35 +04:00
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disable_clk:
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2012-09-28 14:28:23 +04:00
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clk_disable_unprepare(sdhci->clk);
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2012-03-27 07:10:35 +04:00
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put_clk:
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2010-05-27 01:42:10 +04:00
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clk_put(sdhci->clk);
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err:
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dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
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return ret;
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}
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2012-11-19 22:26:03 +04:00
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static int sdhci_remove(struct platform_device *pdev)
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2010-05-27 01:42:10 +04:00
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{
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struct sdhci_host *host = platform_get_drvdata(pdev);
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struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
|
2012-03-27 07:10:35 +04:00
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int dead = 0;
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2010-05-27 01:42:10 +04:00
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u32 scratch;
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scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
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if (scratch == (u32)-1)
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dead = 1;
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sdhci_remove_host(host, dead);
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sdhci_free_host(host);
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2012-09-28 14:28:23 +04:00
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clk_disable_unprepare(sdhci->clk);
|
2010-05-27 01:42:10 +04:00
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clk_put(sdhci->clk);
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return 0;
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}
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|
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|
2013-03-29 11:08:00 +04:00
|
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|
#ifdef CONFIG_PM_SLEEP
|
2011-11-15 14:54:40 +04:00
|
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static int sdhci_suspend(struct device *dev)
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{
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struct sdhci_host *host = dev_get_drvdata(dev);
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struct spear_sdhci *sdhci = dev_get_platdata(dev);
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int ret;
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|
2012-01-04 10:18:42 +04:00
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ret = sdhci_suspend_host(host);
|
2011-11-15 14:54:40 +04:00
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if (!ret)
|
2012-11-08 19:09:10 +04:00
|
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clk_disable(sdhci->clk);
|
2011-11-15 14:54:40 +04:00
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return ret;
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}
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static int sdhci_resume(struct device *dev)
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{
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struct sdhci_host *host = dev_get_drvdata(dev);
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struct spear_sdhci *sdhci = dev_get_platdata(dev);
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int ret;
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|
2012-11-08 19:09:10 +04:00
|
|
|
ret = clk_enable(sdhci->clk);
|
2011-11-15 14:54:40 +04:00
|
|
|
if (ret) {
|
|
|
|
dev_dbg(dev, "Resume: Error enabling clock\n");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
return sdhci_resume_host(host);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2012-02-24 10:25:35 +04:00
|
|
|
static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
|
|
|
|
|
2012-09-28 14:28:22 +04:00
|
|
|
#ifdef CONFIG_OF
|
|
|
|
static const struct of_device_id sdhci_spear_id_table[] = {
|
|
|
|
{ .compatible = "st,spear300-sdhci" },
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
|
|
|
|
#endif
|
|
|
|
|
2010-05-27 01:42:10 +04:00
|
|
|
static struct platform_driver sdhci_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "sdhci",
|
|
|
|
.owner = THIS_MODULE,
|
2011-11-15 14:54:40 +04:00
|
|
|
.pm = &sdhci_pm_ops,
|
2012-09-28 14:28:22 +04:00
|
|
|
.of_match_table = of_match_ptr(sdhci_spear_id_table),
|
2010-05-27 01:42:10 +04:00
|
|
|
},
|
|
|
|
.probe = sdhci_probe,
|
2012-11-19 22:20:26 +04:00
|
|
|
.remove = sdhci_remove,
|
2010-05-27 01:42:10 +04:00
|
|
|
};
|
|
|
|
|
2011-11-26 08:55:43 +04:00
|
|
|
module_platform_driver(sdhci_driver);
|
2010-05-27 01:42:10 +04:00
|
|
|
|
|
|
|
MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
|
2012-06-20 23:53:02 +04:00
|
|
|
MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
|
2010-05-27 01:42:10 +04:00
|
|
|
MODULE_LICENSE("GPL v2");
|