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/module.h>
17 #include <linux/init.h>
18 #include <linux/platform_device.h>
19 #include <linux/clk.h>
22 #include <linux/of_device.h>
23 #include <linux/of_gpio.h>
24 #include <linux/gpio.h>
25 #include <linux/mmc/card.h>
26 #include <linux/mmc/host.h>
27 #include <linux/mmc/slot-gpio.h>
31 #include "sdhci-pltfm.h"
33 /* Tegra SDHOST controller vendor register definitions */
34 #define SDHCI_TEGRA_VENDOR_MISC_CTRL 0x120
35 #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 0x20
37 #define NVQUIRK_FORCE_SDHCI_SPEC_200 BIT(0)
38 #define NVQUIRK_ENABLE_BLOCK_GAP_DET BIT(1)
39 #define NVQUIRK_ENABLE_SDHCI_SPEC_300 BIT(2)
41 struct sdhci_tegra_soc_data {
42 const struct sdhci_pltfm_data *pdata;
47 const struct sdhci_tegra_soc_data *soc_data;
51 static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
55 if (unlikely(reg == SDHCI_PRESENT_STATE)) {
56 /* Use wp_gpio here instead? */
57 val = readl(host->ioaddr + reg);
58 return val | SDHCI_WRITE_PROTECT;
61 return readl(host->ioaddr + reg);
64 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
66 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
67 struct sdhci_tegra *tegra_host = pltfm_host->priv;
68 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
70 if (unlikely((soc_data->nvquirks & NVQUIRK_FORCE_SDHCI_SPEC_200) &&
71 (reg == SDHCI_HOST_VERSION))) {
72 /* Erratum: Version register is invalid in HW. */
73 return SDHCI_SPEC_200;
76 return readw(host->ioaddr + reg);
79 static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
81 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
82 struct sdhci_tegra *tegra_host = pltfm_host->priv;
83 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
85 /* Seems like we're getting spurious timeout and crc errors, so
86 * disable signalling of them. In case of real errors software
87 * timers should take care of eventually detecting them.
89 if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
90 val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);
92 writel(val, host->ioaddr + reg);
94 if (unlikely((soc_data->nvquirks & NVQUIRK_ENABLE_BLOCK_GAP_DET) &&
95 (reg == SDHCI_INT_ENABLE))) {
96 /* Erratum: Must enable block gap interrupt detection */
97 u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
98 if (val & SDHCI_INT_CARD_INT)
102 writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
106 static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host)
108 return mmc_gpio_get_ro(host->mmc);
111 static void tegra_sdhci_reset_exit(struct sdhci_host *host, u8 mask)
113 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
114 struct sdhci_tegra *tegra_host = pltfm_host->priv;
115 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
117 if (!(mask & SDHCI_RESET_ALL))
120 /* Erratum: Enable SDHCI spec v3.00 support */
121 if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300) {
124 misc_ctrl = sdhci_readb(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
125 misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300;
126 sdhci_writeb(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
130 static int tegra_sdhci_buswidth(struct sdhci_host *host, int bus_width)
134 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
135 if ((host->mmc->caps & MMC_CAP_8_BIT_DATA) &&
136 (bus_width == MMC_BUS_WIDTH_8)) {
137 ctrl &= ~SDHCI_CTRL_4BITBUS;
138 ctrl |= SDHCI_CTRL_8BITBUS;
140 ctrl &= ~SDHCI_CTRL_8BITBUS;
141 if (bus_width == MMC_BUS_WIDTH_4)
142 ctrl |= SDHCI_CTRL_4BITBUS;
144 ctrl &= ~SDHCI_CTRL_4BITBUS;
146 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
150 static const struct sdhci_ops tegra_sdhci_ops = {
151 .get_ro = tegra_sdhci_get_ro,
152 .read_l = tegra_sdhci_readl,
153 .read_w = tegra_sdhci_readw,
154 .write_l = tegra_sdhci_writel,
155 .platform_bus_width = tegra_sdhci_buswidth,
156 .platform_reset_exit = tegra_sdhci_reset_exit,
159 static const struct sdhci_pltfm_data sdhci_tegra20_pdata = {
160 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
161 SDHCI_QUIRK_SINGLE_POWER_WRITE |
162 SDHCI_QUIRK_NO_HISPD_BIT |
163 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
164 .ops = &tegra_sdhci_ops,
167 static struct sdhci_tegra_soc_data soc_data_tegra20 = {
168 .pdata = &sdhci_tegra20_pdata,
169 .nvquirks = NVQUIRK_FORCE_SDHCI_SPEC_200 |
170 NVQUIRK_ENABLE_BLOCK_GAP_DET,
173 static const struct sdhci_pltfm_data sdhci_tegra30_pdata = {
174 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
175 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
176 SDHCI_QUIRK_SINGLE_POWER_WRITE |
177 SDHCI_QUIRK_NO_HISPD_BIT |
178 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
179 .ops = &tegra_sdhci_ops,
182 static struct sdhci_tegra_soc_data soc_data_tegra30 = {
183 .pdata = &sdhci_tegra30_pdata,
184 .nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300,
187 static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
188 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
189 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
190 SDHCI_QUIRK_SINGLE_POWER_WRITE |
191 SDHCI_QUIRK_NO_HISPD_BIT |
192 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
193 .ops = &tegra_sdhci_ops,
196 static struct sdhci_tegra_soc_data soc_data_tegra114 = {
197 .pdata = &sdhci_tegra114_pdata,
200 static const struct of_device_id sdhci_tegra_dt_match[] = {
201 { .compatible = "nvidia,tegra124-sdhci", .data = &soc_data_tegra114 },
202 { .compatible = "nvidia,tegra114-sdhci", .data = &soc_data_tegra114 },
203 { .compatible = "nvidia,tegra30-sdhci", .data = &soc_data_tegra30 },
204 { .compatible = "nvidia,tegra20-sdhci", .data = &soc_data_tegra20 },
207 MODULE_DEVICE_TABLE(of, sdhci_tegra_dt_match);
209 static int sdhci_tegra_parse_dt(struct device *dev)
211 struct device_node *np = dev->of_node;
212 struct sdhci_host *host = dev_get_drvdata(dev);
213 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
214 struct sdhci_tegra *tegra_host = pltfm_host->priv;
216 tegra_host->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
217 return mmc_of_parse(host->mmc);
220 static int sdhci_tegra_probe(struct platform_device *pdev)
222 const struct of_device_id *match;
223 const struct sdhci_tegra_soc_data *soc_data;
224 struct sdhci_host *host;
225 struct sdhci_pltfm_host *pltfm_host;
226 struct sdhci_tegra *tegra_host;
230 match = of_match_device(sdhci_tegra_dt_match, &pdev->dev);
233 soc_data = match->data;
235 host = sdhci_pltfm_init(pdev, soc_data->pdata, 0);
237 return PTR_ERR(host);
238 pltfm_host = sdhci_priv(host);
240 tegra_host = devm_kzalloc(&pdev->dev, sizeof(*tegra_host), GFP_KERNEL);
242 dev_err(mmc_dev(host->mmc), "failed to allocate tegra_host\n");
244 goto err_alloc_tegra_host;
246 tegra_host->soc_data = soc_data;
247 pltfm_host->priv = tegra_host;
249 rc = sdhci_tegra_parse_dt(&pdev->dev);
253 if (gpio_is_valid(tegra_host->power_gpio)) {
254 rc = gpio_request(tegra_host->power_gpio, "sdhci_power");
256 dev_err(mmc_dev(host->mmc),
257 "failed to allocate power gpio\n");
260 gpio_direction_output(tegra_host->power_gpio, 1);
263 clk = clk_get(mmc_dev(host->mmc), NULL);
265 dev_err(mmc_dev(host->mmc), "clk err\n");
269 clk_prepare_enable(clk);
270 pltfm_host->clk = clk;
272 rc = sdhci_add_host(host);
279 clk_disable_unprepare(pltfm_host->clk);
280 clk_put(pltfm_host->clk);
282 if (gpio_is_valid(tegra_host->power_gpio))
283 gpio_free(tegra_host->power_gpio);
286 err_alloc_tegra_host:
287 sdhci_pltfm_free(pdev);
291 static int sdhci_tegra_remove(struct platform_device *pdev)
293 struct sdhci_host *host = platform_get_drvdata(pdev);
294 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
295 struct sdhci_tegra *tegra_host = pltfm_host->priv;
296 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
298 sdhci_remove_host(host, dead);
300 if (gpio_is_valid(tegra_host->power_gpio))
301 gpio_free(tegra_host->power_gpio);
303 clk_disable_unprepare(pltfm_host->clk);
304 clk_put(pltfm_host->clk);
306 sdhci_pltfm_free(pdev);
311 static struct platform_driver sdhci_tegra_driver = {
313 .name = "sdhci-tegra",
314 .owner = THIS_MODULE,
315 .of_match_table = sdhci_tegra_dt_match,
316 .pm = SDHCI_PLTFM_PMOPS,
318 .probe = sdhci_tegra_probe,
319 .remove = sdhci_tegra_remove,
322 module_platform_driver(sdhci_tegra_driver);
324 MODULE_DESCRIPTION("SDHCI driver for Tegra");
325 MODULE_AUTHOR("Google, Inc.");
326 MODULE_LICENSE("GPL v2");