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>
27 #include <mach/sdhci.h>
29 #include "sdhci-pltfm.h"
31 static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
35 if (unlikely(reg == SDHCI_PRESENT_STATE)) {
36 /* Use wp_gpio here instead? */
37 val = readl(host->ioaddr + reg);
38 return val | SDHCI_WRITE_PROTECT;
41 return readl(host->ioaddr + reg);
44 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
46 if (unlikely(reg == SDHCI_HOST_VERSION)) {
47 /* Erratum: Version register is invalid in HW. */
48 return SDHCI_SPEC_200;
51 return readw(host->ioaddr + reg);
54 static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
56 /* Seems like we're getting spurious timeout and crc errors, so
57 * disable signalling of them. In case of real errors software
58 * timers should take care of eventually detecting them.
60 if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
61 val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);
63 writel(val, host->ioaddr + reg);
65 if (unlikely(reg == SDHCI_INT_ENABLE)) {
66 /* Erratum: Must enable block gap interrupt detection */
67 u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
68 if (val & SDHCI_INT_CARD_INT)
72 writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
76 static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
78 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(sdhci);
79 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
81 if (!gpio_is_valid(plat->wp_gpio))
84 return gpio_get_value(plat->wp_gpio);
87 static irqreturn_t carddetect_irq(int irq, void *data)
89 struct sdhci_host *sdhost = (struct sdhci_host *)data;
91 tasklet_schedule(&sdhost->card_tasklet);
95 static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
97 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
98 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
101 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
102 if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
103 ctrl &= ~SDHCI_CTRL_4BITBUS;
104 ctrl |= SDHCI_CTRL_8BITBUS;
106 ctrl &= ~SDHCI_CTRL_8BITBUS;
107 if (bus_width == MMC_BUS_WIDTH_4)
108 ctrl |= SDHCI_CTRL_4BITBUS;
110 ctrl &= ~SDHCI_CTRL_4BITBUS;
112 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
116 static struct sdhci_ops tegra_sdhci_ops = {
117 .get_ro = tegra_sdhci_get_ro,
118 .read_l = tegra_sdhci_readl,
119 .read_w = tegra_sdhci_readw,
120 .write_l = tegra_sdhci_writel,
121 .platform_8bit_width = tegra_sdhci_8bit,
124 static struct sdhci_pltfm_data sdhci_tegra_pdata = {
125 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
126 SDHCI_QUIRK_SINGLE_POWER_WRITE |
127 SDHCI_QUIRK_NO_HISPD_BIT |
128 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
129 .ops = &tegra_sdhci_ops,
132 static const struct of_device_id sdhci_tegra_dt_match[] __devinitdata = {
133 { .compatible = "nvidia,tegra20-sdhci", },
136 MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
138 static struct tegra_sdhci_platform_data * __devinit sdhci_tegra_dt_parse_pdata(
139 struct platform_device *pdev)
141 struct tegra_sdhci_platform_data *plat;
142 struct device_node *np = pdev->dev.of_node;
147 plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
149 dev_err(&pdev->dev, "Can't allocate platform data\n");
153 plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
154 plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
155 plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
156 if (of_find_property(np, "support-8bit", NULL))
162 static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
164 struct sdhci_pltfm_host *pltfm_host;
165 struct tegra_sdhci_platform_data *plat;
166 struct sdhci_host *host;
170 host = sdhci_pltfm_init(pdev, &sdhci_tegra_pdata);
172 return PTR_ERR(host);
174 pltfm_host = sdhci_priv(host);
176 plat = pdev->dev.platform_data;
179 plat = sdhci_tegra_dt_parse_pdata(pdev);
182 dev_err(mmc_dev(host->mmc), "missing platform data\n");
187 pltfm_host->priv = plat;
189 if (gpio_is_valid(plat->power_gpio)) {
190 rc = gpio_request(plat->power_gpio, "sdhci_power");
192 dev_err(mmc_dev(host->mmc),
193 "failed to allocate power gpio\n");
196 tegra_gpio_enable(plat->power_gpio);
197 gpio_direction_output(plat->power_gpio, 1);
200 if (gpio_is_valid(plat->cd_gpio)) {
201 rc = gpio_request(plat->cd_gpio, "sdhci_cd");
203 dev_err(mmc_dev(host->mmc),
204 "failed to allocate cd gpio\n");
207 tegra_gpio_enable(plat->cd_gpio);
208 gpio_direction_input(plat->cd_gpio);
210 rc = request_irq(gpio_to_irq(plat->cd_gpio), carddetect_irq,
211 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
212 mmc_hostname(host->mmc), host);
215 dev_err(mmc_dev(host->mmc), "request irq error\n");
221 if (gpio_is_valid(plat->wp_gpio)) {
222 rc = gpio_request(plat->wp_gpio, "sdhci_wp");
224 dev_err(mmc_dev(host->mmc),
225 "failed to allocate wp gpio\n");
228 tegra_gpio_enable(plat->wp_gpio);
229 gpio_direction_input(plat->wp_gpio);
232 clk = clk_get(mmc_dev(host->mmc), NULL);
234 dev_err(mmc_dev(host->mmc), "clk err\n");
239 pltfm_host->clk = clk;
241 host->mmc->pm_caps = plat->pm_flags;
244 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
246 rc = sdhci_add_host(host);
253 clk_disable(pltfm_host->clk);
254 clk_put(pltfm_host->clk);
256 if (gpio_is_valid(plat->wp_gpio)) {
257 tegra_gpio_disable(plat->wp_gpio);
258 gpio_free(plat->wp_gpio);
261 if (gpio_is_valid(plat->cd_gpio))
262 free_irq(gpio_to_irq(plat->cd_gpio), host);
264 if (gpio_is_valid(plat->cd_gpio)) {
265 tegra_gpio_disable(plat->cd_gpio);
266 gpio_free(plat->cd_gpio);
269 if (gpio_is_valid(plat->power_gpio)) {
270 tegra_gpio_disable(plat->power_gpio);
271 gpio_free(plat->power_gpio);
275 sdhci_pltfm_free(pdev);
279 static int __devexit sdhci_tegra_remove(struct platform_device *pdev)
281 struct sdhci_host *host = platform_get_drvdata(pdev);
282 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
283 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
284 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
286 sdhci_remove_host(host, dead);
288 if (gpio_is_valid(plat->wp_gpio)) {
289 tegra_gpio_disable(plat->wp_gpio);
290 gpio_free(plat->wp_gpio);
293 if (gpio_is_valid(plat->cd_gpio)) {
294 free_irq(gpio_to_irq(plat->cd_gpio), host);
295 tegra_gpio_disable(plat->cd_gpio);
296 gpio_free(plat->cd_gpio);
299 if (gpio_is_valid(plat->power_gpio)) {
300 tegra_gpio_disable(plat->power_gpio);
301 gpio_free(plat->power_gpio);
304 clk_disable(pltfm_host->clk);
305 clk_put(pltfm_host->clk);
307 sdhci_pltfm_free(pdev);
312 static struct platform_driver sdhci_tegra_driver = {
314 .name = "sdhci-tegra",
315 .owner = THIS_MODULE,
316 .of_match_table = sdhci_tegra_dt_match,
318 .probe = sdhci_tegra_probe,
319 .remove = __devexit_p(sdhci_tegra_remove),
321 .suspend = sdhci_pltfm_suspend,
322 .resume = sdhci_pltfm_resume,
326 static int __init sdhci_tegra_init(void)
328 return platform_driver_register(&sdhci_tegra_driver);
330 module_init(sdhci_tegra_init);
332 static void __exit sdhci_tegra_exit(void)
334 platform_driver_unregister(&sdhci_tegra_driver);
336 module_exit(sdhci_tegra_exit);
338 MODULE_DESCRIPTION("SDHCI driver for Tegra");
339 MODULE_AUTHOR(" Google, Inc.");
340 MODULE_LICENSE("GPL v2");