2 * Copyright (C) 2010 Google, Inc.
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
15 #include <linux/err.h>
16 #include <linux/init.h>
17 #include <linux/platform_device.h>
18 #include <linux/clk.h>
21 #include <linux/of_gpio.h>
22 #include <linux/gpio.h>
23 #include <linux/mmc/card.h>
24 #include <linux/mmc/host.h>
25 #include <linux/module.h>
29 #include <mach/gpio-tegra.h>
30 #include <mach/sdhci.h>
32 #include "sdhci-pltfm.h"
34 static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
38 if (unlikely(reg == SDHCI_PRESENT_STATE)) {
39 /* Use wp_gpio here instead? */
40 val = readl(host->ioaddr + reg);
41 return val | SDHCI_WRITE_PROTECT;
44 return readl(host->ioaddr + reg);
47 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
49 if (unlikely(reg == SDHCI_HOST_VERSION)) {
50 /* Erratum: Version register is invalid in HW. */
51 return SDHCI_SPEC_200;
54 return readw(host->ioaddr + reg);
57 static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
59 /* Seems like we're getting spurious timeout and crc errors, so
60 * disable signalling of them. In case of real errors software
61 * timers should take care of eventually detecting them.
63 if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
64 val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);
66 writel(val, host->ioaddr + reg);
68 if (unlikely(reg == SDHCI_INT_ENABLE)) {
69 /* Erratum: Must enable block gap interrupt detection */
70 u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
71 if (val & SDHCI_INT_CARD_INT)
75 writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
79 static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
81 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(sdhci);
82 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
84 if (!gpio_is_valid(plat->wp_gpio))
87 return gpio_get_value(plat->wp_gpio);
90 static irqreturn_t carddetect_irq(int irq, void *data)
92 struct sdhci_host *sdhost = (struct sdhci_host *)data;
94 tasklet_schedule(&sdhost->card_tasklet);
98 static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
100 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
101 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
104 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
105 if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
106 ctrl &= ~SDHCI_CTRL_4BITBUS;
107 ctrl |= SDHCI_CTRL_8BITBUS;
109 ctrl &= ~SDHCI_CTRL_8BITBUS;
110 if (bus_width == MMC_BUS_WIDTH_4)
111 ctrl |= SDHCI_CTRL_4BITBUS;
113 ctrl &= ~SDHCI_CTRL_4BITBUS;
115 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
119 static struct sdhci_ops tegra_sdhci_ops = {
120 .get_ro = tegra_sdhci_get_ro,
121 .read_l = tegra_sdhci_readl,
122 .read_w = tegra_sdhci_readw,
123 .write_l = tegra_sdhci_writel,
124 .platform_8bit_width = tegra_sdhci_8bit,
127 static struct sdhci_pltfm_data sdhci_tegra_pdata = {
128 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
129 SDHCI_QUIRK_SINGLE_POWER_WRITE |
130 SDHCI_QUIRK_NO_HISPD_BIT |
131 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
132 .ops = &tegra_sdhci_ops,
135 static const struct of_device_id sdhci_tegra_dt_match[] __devinitdata = {
136 { .compatible = "nvidia,tegra20-sdhci", },
139 MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
141 static struct tegra_sdhci_platform_data * __devinit sdhci_tegra_dt_parse_pdata(
142 struct platform_device *pdev)
144 struct tegra_sdhci_platform_data *plat;
145 struct device_node *np = pdev->dev.of_node;
150 plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
152 dev_err(&pdev->dev, "Can't allocate platform data\n");
156 plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
157 plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
158 plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
159 if (of_find_property(np, "support-8bit", NULL))
165 static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
167 struct sdhci_pltfm_host *pltfm_host;
168 struct tegra_sdhci_platform_data *plat;
169 struct sdhci_host *host;
173 host = sdhci_pltfm_init(pdev, &sdhci_tegra_pdata);
175 return PTR_ERR(host);
177 pltfm_host = sdhci_priv(host);
179 plat = pdev->dev.platform_data;
182 plat = sdhci_tegra_dt_parse_pdata(pdev);
185 dev_err(mmc_dev(host->mmc), "missing platform data\n");
190 pltfm_host->priv = plat;
192 if (gpio_is_valid(plat->power_gpio)) {
193 rc = gpio_request(plat->power_gpio, "sdhci_power");
195 dev_err(mmc_dev(host->mmc),
196 "failed to allocate power gpio\n");
199 tegra_gpio_enable(plat->power_gpio);
200 gpio_direction_output(plat->power_gpio, 1);
203 if (gpio_is_valid(plat->cd_gpio)) {
204 rc = gpio_request(plat->cd_gpio, "sdhci_cd");
206 dev_err(mmc_dev(host->mmc),
207 "failed to allocate cd gpio\n");
210 tegra_gpio_enable(plat->cd_gpio);
211 gpio_direction_input(plat->cd_gpio);
213 rc = request_irq(gpio_to_irq(plat->cd_gpio), carddetect_irq,
214 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
215 mmc_hostname(host->mmc), host);
218 dev_err(mmc_dev(host->mmc), "request irq error\n");
224 if (gpio_is_valid(plat->wp_gpio)) {
225 rc = gpio_request(plat->wp_gpio, "sdhci_wp");
227 dev_err(mmc_dev(host->mmc),
228 "failed to allocate wp gpio\n");
231 tegra_gpio_enable(plat->wp_gpio);
232 gpio_direction_input(plat->wp_gpio);
235 clk = clk_get(mmc_dev(host->mmc), NULL);
237 dev_err(mmc_dev(host->mmc), "clk err\n");
242 pltfm_host->clk = clk;
244 host->mmc->pm_caps = plat->pm_flags;
247 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
249 rc = sdhci_add_host(host);
256 clk_disable(pltfm_host->clk);
257 clk_put(pltfm_host->clk);
259 if (gpio_is_valid(plat->wp_gpio)) {
260 tegra_gpio_disable(plat->wp_gpio);
261 gpio_free(plat->wp_gpio);
264 if (gpio_is_valid(plat->cd_gpio))
265 free_irq(gpio_to_irq(plat->cd_gpio), host);
267 if (gpio_is_valid(plat->cd_gpio)) {
268 tegra_gpio_disable(plat->cd_gpio);
269 gpio_free(plat->cd_gpio);
272 if (gpio_is_valid(plat->power_gpio)) {
273 tegra_gpio_disable(plat->power_gpio);
274 gpio_free(plat->power_gpio);
278 sdhci_pltfm_free(pdev);
282 static int __devexit sdhci_tegra_remove(struct platform_device *pdev)
284 struct sdhci_host *host = platform_get_drvdata(pdev);
285 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
286 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
287 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
289 sdhci_remove_host(host, dead);
291 if (gpio_is_valid(plat->wp_gpio)) {
292 tegra_gpio_disable(plat->wp_gpio);
293 gpio_free(plat->wp_gpio);
296 if (gpio_is_valid(plat->cd_gpio)) {
297 free_irq(gpio_to_irq(plat->cd_gpio), host);
298 tegra_gpio_disable(plat->cd_gpio);
299 gpio_free(plat->cd_gpio);
302 if (gpio_is_valid(plat->power_gpio)) {
303 tegra_gpio_disable(plat->power_gpio);
304 gpio_free(plat->power_gpio);
307 clk_disable(pltfm_host->clk);
308 clk_put(pltfm_host->clk);
310 sdhci_pltfm_free(pdev);
315 static struct platform_driver sdhci_tegra_driver = {
317 .name = "sdhci-tegra",
318 .owner = THIS_MODULE,
319 .of_match_table = sdhci_tegra_dt_match,
321 .probe = sdhci_tegra_probe,
322 .remove = __devexit_p(sdhci_tegra_remove),
324 .suspend = sdhci_pltfm_suspend,
325 .resume = sdhci_pltfm_resume,
329 static int __init sdhci_tegra_init(void)
331 return platform_driver_register(&sdhci_tegra_driver);
333 module_init(sdhci_tegra_init);
335 static void __exit sdhci_tegra_exit(void)
337 platform_driver_unregister(&sdhci_tegra_driver);
339 module_exit(sdhci_tegra_exit);
341 MODULE_DESCRIPTION("SDHCI driver for Tegra");
342 MODULE_AUTHOR(" Google, Inc.");
343 MODULE_LICENSE("GPL v2");