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>
20 #include <linux/of_gpio.h>
21 #include <linux/gpio.h>
22 #include <linux/mmc/card.h>
23 #include <linux/mmc/host.h>
25 #include <mach/gpio.h>
26 #include <mach/sdhci.h>
28 #include "sdhci-pltfm.h"
30 static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
34 if (unlikely(reg == SDHCI_PRESENT_STATE)) {
35 /* Use wp_gpio here instead? */
36 val = readl(host->ioaddr + reg);
37 return val | SDHCI_WRITE_PROTECT;
40 return readl(host->ioaddr + reg);
43 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
45 if (unlikely(reg == SDHCI_HOST_VERSION)) {
46 /* Erratum: Version register is invalid in HW. */
47 return SDHCI_SPEC_200;
50 return readw(host->ioaddr + reg);
53 static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
55 /* Seems like we're getting spurious timeout and crc errors, so
56 * disable signalling of them. In case of real errors software
57 * timers should take care of eventually detecting them.
59 if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
60 val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);
62 writel(val, host->ioaddr + reg);
64 if (unlikely(reg == SDHCI_INT_ENABLE)) {
65 /* Erratum: Must enable block gap interrupt detection */
66 u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
67 if (val & SDHCI_INT_CARD_INT)
71 writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
75 static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
77 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(sdhci);
78 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
80 if (!gpio_is_valid(plat->wp_gpio))
83 return gpio_get_value(plat->wp_gpio);
86 static irqreturn_t carddetect_irq(int irq, void *data)
88 struct sdhci_host *sdhost = (struct sdhci_host *)data;
90 tasklet_schedule(&sdhost->card_tasklet);
94 static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
96 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
97 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
100 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
101 if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
102 ctrl &= ~SDHCI_CTRL_4BITBUS;
103 ctrl |= SDHCI_CTRL_8BITBUS;
105 ctrl &= ~SDHCI_CTRL_8BITBUS;
106 if (bus_width == MMC_BUS_WIDTH_4)
107 ctrl |= SDHCI_CTRL_4BITBUS;
109 ctrl &= ~SDHCI_CTRL_4BITBUS;
111 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
115 static struct sdhci_ops tegra_sdhci_ops = {
116 .get_ro = tegra_sdhci_get_ro,
117 .read_l = tegra_sdhci_readl,
118 .read_w = tegra_sdhci_readw,
119 .write_l = tegra_sdhci_writel,
120 .platform_8bit_width = tegra_sdhci_8bit,
123 static struct sdhci_pltfm_data sdhci_tegra_pdata = {
124 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
125 SDHCI_QUIRK_SINGLE_POWER_WRITE |
126 SDHCI_QUIRK_NO_HISPD_BIT |
127 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
128 .ops = &tegra_sdhci_ops,
131 static const struct of_device_id sdhci_tegra_dt_match[] __devinitdata = {
132 { .compatible = "nvidia,tegra20-sdhci", },
135 MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
137 static struct tegra_sdhci_platform_data * __devinit sdhci_tegra_dt_parse_pdata(
138 struct platform_device *pdev)
140 struct tegra_sdhci_platform_data *plat;
141 struct device_node *np = pdev->dev.of_node;
146 plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
148 dev_err(&pdev->dev, "Can't allocate platform data\n");
152 plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
153 plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
154 plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
159 static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
161 struct sdhci_pltfm_host *pltfm_host;
162 struct tegra_sdhci_platform_data *plat;
163 struct sdhci_host *host;
167 host = sdhci_pltfm_init(pdev, &sdhci_tegra_pdata);
169 return PTR_ERR(host);
171 pltfm_host = sdhci_priv(host);
173 plat = pdev->dev.platform_data;
176 plat = sdhci_tegra_dt_parse_pdata(pdev);
179 dev_err(mmc_dev(host->mmc), "missing platform data\n");
184 pltfm_host->priv = plat;
186 if (gpio_is_valid(plat->power_gpio)) {
187 rc = gpio_request(plat->power_gpio, "sdhci_power");
189 dev_err(mmc_dev(host->mmc),
190 "failed to allocate power gpio\n");
193 tegra_gpio_enable(plat->power_gpio);
194 gpio_direction_output(plat->power_gpio, 1);
197 if (gpio_is_valid(plat->cd_gpio)) {
198 rc = gpio_request(plat->cd_gpio, "sdhci_cd");
200 dev_err(mmc_dev(host->mmc),
201 "failed to allocate cd gpio\n");
204 tegra_gpio_enable(plat->cd_gpio);
205 gpio_direction_input(plat->cd_gpio);
207 rc = request_irq(gpio_to_irq(plat->cd_gpio), carddetect_irq,
208 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
209 mmc_hostname(host->mmc), host);
212 dev_err(mmc_dev(host->mmc), "request irq error\n");
218 if (gpio_is_valid(plat->wp_gpio)) {
219 rc = gpio_request(plat->wp_gpio, "sdhci_wp");
221 dev_err(mmc_dev(host->mmc),
222 "failed to allocate wp gpio\n");
225 tegra_gpio_enable(plat->wp_gpio);
226 gpio_direction_input(plat->wp_gpio);
229 clk = clk_get(mmc_dev(host->mmc), NULL);
231 dev_err(mmc_dev(host->mmc), "clk err\n");
236 pltfm_host->clk = clk;
238 host->mmc->pm_caps = plat->pm_flags;
241 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
243 rc = sdhci_add_host(host);
250 clk_disable(pltfm_host->clk);
251 clk_put(pltfm_host->clk);
253 if (gpio_is_valid(plat->wp_gpio)) {
254 tegra_gpio_disable(plat->wp_gpio);
255 gpio_free(plat->wp_gpio);
258 if (gpio_is_valid(plat->cd_gpio))
259 free_irq(gpio_to_irq(plat->cd_gpio), host);
261 if (gpio_is_valid(plat->cd_gpio)) {
262 tegra_gpio_disable(plat->cd_gpio);
263 gpio_free(plat->cd_gpio);
266 if (gpio_is_valid(plat->power_gpio)) {
267 tegra_gpio_disable(plat->power_gpio);
268 gpio_free(plat->power_gpio);
272 sdhci_pltfm_free(pdev);
276 static int __devexit sdhci_tegra_remove(struct platform_device *pdev)
278 struct sdhci_host *host = platform_get_drvdata(pdev);
279 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
280 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
281 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
283 sdhci_remove_host(host, dead);
285 if (gpio_is_valid(plat->wp_gpio)) {
286 tegra_gpio_disable(plat->wp_gpio);
287 gpio_free(plat->wp_gpio);
290 if (gpio_is_valid(plat->cd_gpio)) {
291 free_irq(gpio_to_irq(plat->cd_gpio), host);
292 tegra_gpio_disable(plat->cd_gpio);
293 gpio_free(plat->cd_gpio);
296 if (gpio_is_valid(plat->power_gpio)) {
297 tegra_gpio_disable(plat->power_gpio);
298 gpio_free(plat->power_gpio);
301 clk_disable(pltfm_host->clk);
302 clk_put(pltfm_host->clk);
304 sdhci_pltfm_free(pdev);
309 static struct platform_driver sdhci_tegra_driver = {
311 .name = "sdhci-tegra",
312 .owner = THIS_MODULE,
313 .of_match_table = sdhci_tegra_dt_match,
315 .probe = sdhci_tegra_probe,
316 .remove = __devexit_p(sdhci_tegra_remove),
318 .suspend = sdhci_pltfm_suspend,
319 .resume = sdhci_pltfm_resume,
323 static int __init sdhci_tegra_init(void)
325 return platform_driver_register(&sdhci_tegra_driver);
327 module_init(sdhci_tegra_init);
329 static void __exit sdhci_tegra_exit(void)
331 platform_driver_unregister(&sdhci_tegra_driver);
333 module_exit(sdhci_tegra_exit);
335 MODULE_DESCRIPTION("SDHCI driver for Tegra");
336 MODULE_AUTHOR(" Google, Inc.");
337 MODULE_LICENSE("GPL v2");