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_SDR104 0x8
36 #define SDHCI_MISC_CTRL_ENABLE_SDR50 0x10
37 #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 0x20
38 #define SDHCI_MISC_CTRL_ENABLE_DDR50 0x200
40 #define NVQUIRK_FORCE_SDHCI_SPEC_200 BIT(0)
41 #define NVQUIRK_ENABLE_BLOCK_GAP_DET BIT(1)
42 #define NVQUIRK_ENABLE_SDHCI_SPEC_300 BIT(2)
43 #define NVQUIRK_DISABLE_SDR50 BIT(3)
44 #define NVQUIRK_DISABLE_SDR104 BIT(4)
45 #define NVQUIRK_DISABLE_DDR50 BIT(5)
47 struct sdhci_tegra_soc_data {
48 const struct sdhci_pltfm_data *pdata;
53 const struct sdhci_tegra_soc_data *soc_data;
57 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
59 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
60 struct sdhci_tegra *tegra_host = pltfm_host->priv;
61 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
63 if (unlikely((soc_data->nvquirks & NVQUIRK_FORCE_SDHCI_SPEC_200) &&
64 (reg == SDHCI_HOST_VERSION))) {
65 /* Erratum: Version register is invalid in HW. */
66 return SDHCI_SPEC_200;
69 return readw(host->ioaddr + reg);
72 static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
74 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
75 struct sdhci_tegra *tegra_host = pltfm_host->priv;
76 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
78 /* Seems like we're getting spurious timeout and crc errors, so
79 * disable signalling of them. In case of real errors software
80 * timers should take care of eventually detecting them.
82 if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
83 val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);
85 writel(val, host->ioaddr + reg);
87 if (unlikely((soc_data->nvquirks & NVQUIRK_ENABLE_BLOCK_GAP_DET) &&
88 (reg == SDHCI_INT_ENABLE))) {
89 /* Erratum: Must enable block gap interrupt detection */
90 u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
91 if (val & SDHCI_INT_CARD_INT)
95 writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
99 static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host)
101 return mmc_gpio_get_ro(host->mmc);
104 static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask)
106 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
107 struct sdhci_tegra *tegra_host = pltfm_host->priv;
108 const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
111 sdhci_reset(host, mask);
113 if (!(mask & SDHCI_RESET_ALL))
116 misc_ctrl = sdhci_readw(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
117 /* Erratum: Enable SDHCI spec v3.00 support */
118 if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300)
119 misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300;
120 /* Don't advertise UHS modes which aren't supported yet */
121 if (soc_data->nvquirks & NVQUIRK_DISABLE_SDR50)
122 misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_SDR50;
123 if (soc_data->nvquirks & NVQUIRK_DISABLE_DDR50)
124 misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_DDR50;
125 if (soc_data->nvquirks & NVQUIRK_DISABLE_SDR104)
126 misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_SDR104;
127 sdhci_writew(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
130 static void tegra_sdhci_set_bus_width(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);
149 static const struct sdhci_ops tegra_sdhci_ops = {
150 .get_ro = tegra_sdhci_get_ro,
151 .read_w = tegra_sdhci_readw,
152 .write_l = tegra_sdhci_writel,
153 .set_clock = sdhci_set_clock,
154 .set_bus_width = tegra_sdhci_set_bus_width,
155 .reset = tegra_sdhci_reset,
156 .set_uhs_signaling = sdhci_set_uhs_signaling,
157 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
160 static const struct sdhci_pltfm_data sdhci_tegra20_pdata = {
161 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
162 SDHCI_QUIRK_SINGLE_POWER_WRITE |
163 SDHCI_QUIRK_NO_HISPD_BIT |
164 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
165 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
166 .ops = &tegra_sdhci_ops,
169 static struct sdhci_tegra_soc_data soc_data_tegra20 = {
170 .pdata = &sdhci_tegra20_pdata,
171 .nvquirks = NVQUIRK_FORCE_SDHCI_SPEC_200 |
172 NVQUIRK_ENABLE_BLOCK_GAP_DET,
175 static const struct sdhci_pltfm_data sdhci_tegra30_pdata = {
176 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
177 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
178 SDHCI_QUIRK_SINGLE_POWER_WRITE |
179 SDHCI_QUIRK_NO_HISPD_BIT |
180 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
181 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
182 .ops = &tegra_sdhci_ops,
185 static struct sdhci_tegra_soc_data soc_data_tegra30 = {
186 .pdata = &sdhci_tegra30_pdata,
187 .nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300 |
188 NVQUIRK_DISABLE_SDR50 |
189 NVQUIRK_DISABLE_SDR104,
192 static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
193 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
194 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
195 SDHCI_QUIRK_SINGLE_POWER_WRITE |
196 SDHCI_QUIRK_NO_HISPD_BIT |
197 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
198 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
199 .ops = &tegra_sdhci_ops,
202 static struct sdhci_tegra_soc_data soc_data_tegra114 = {
203 .pdata = &sdhci_tegra114_pdata,
204 .nvquirks = NVQUIRK_DISABLE_SDR50 |
205 NVQUIRK_DISABLE_DDR50 |
206 NVQUIRK_DISABLE_SDR104,
209 static const struct of_device_id sdhci_tegra_dt_match[] = {
210 { .compatible = "nvidia,tegra124-sdhci", .data = &soc_data_tegra114 },
211 { .compatible = "nvidia,tegra114-sdhci", .data = &soc_data_tegra114 },
212 { .compatible = "nvidia,tegra30-sdhci", .data = &soc_data_tegra30 },
213 { .compatible = "nvidia,tegra20-sdhci", .data = &soc_data_tegra20 },
216 MODULE_DEVICE_TABLE(of, sdhci_tegra_dt_match);
218 static int sdhci_tegra_parse_dt(struct device *dev)
220 struct device_node *np = dev->of_node;
221 struct sdhci_host *host = dev_get_drvdata(dev);
222 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
223 struct sdhci_tegra *tegra_host = pltfm_host->priv;
225 tegra_host->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
226 return mmc_of_parse(host->mmc);
229 static int sdhci_tegra_probe(struct platform_device *pdev)
231 const struct of_device_id *match;
232 const struct sdhci_tegra_soc_data *soc_data;
233 struct sdhci_host *host;
234 struct sdhci_pltfm_host *pltfm_host;
235 struct sdhci_tegra *tegra_host;
239 match = of_match_device(sdhci_tegra_dt_match, &pdev->dev);
242 soc_data = match->data;
244 host = sdhci_pltfm_init(pdev, soc_data->pdata, 0);
246 return PTR_ERR(host);
247 pltfm_host = sdhci_priv(host);
249 tegra_host = devm_kzalloc(&pdev->dev, sizeof(*tegra_host), GFP_KERNEL);
251 dev_err(mmc_dev(host->mmc), "failed to allocate tegra_host\n");
253 goto err_alloc_tegra_host;
255 tegra_host->soc_data = soc_data;
256 pltfm_host->priv = tegra_host;
258 rc = sdhci_tegra_parse_dt(&pdev->dev);
262 if (gpio_is_valid(tegra_host->power_gpio)) {
263 rc = gpio_request(tegra_host->power_gpio, "sdhci_power");
265 dev_err(mmc_dev(host->mmc),
266 "failed to allocate power gpio\n");
269 gpio_direction_output(tegra_host->power_gpio, 1);
272 clk = clk_get(mmc_dev(host->mmc), NULL);
274 dev_err(mmc_dev(host->mmc), "clk err\n");
278 clk_prepare_enable(clk);
279 pltfm_host->clk = clk;
281 rc = sdhci_add_host(host);
288 clk_disable_unprepare(pltfm_host->clk);
289 clk_put(pltfm_host->clk);
291 if (gpio_is_valid(tegra_host->power_gpio))
292 gpio_free(tegra_host->power_gpio);
295 err_alloc_tegra_host:
296 sdhci_pltfm_free(pdev);
300 static int sdhci_tegra_remove(struct platform_device *pdev)
302 struct sdhci_host *host = platform_get_drvdata(pdev);
303 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
304 struct sdhci_tegra *tegra_host = pltfm_host->priv;
305 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
307 sdhci_remove_host(host, dead);
309 if (gpio_is_valid(tegra_host->power_gpio))
310 gpio_free(tegra_host->power_gpio);
312 clk_disable_unprepare(pltfm_host->clk);
313 clk_put(pltfm_host->clk);
315 sdhci_pltfm_free(pdev);
320 static struct platform_driver sdhci_tegra_driver = {
322 .name = "sdhci-tegra",
323 .owner = THIS_MODULE,
324 .of_match_table = sdhci_tegra_dt_match,
325 .pm = SDHCI_PLTFM_PMOPS,
327 .probe = sdhci_tegra_probe,
328 .remove = sdhci_tegra_remove,
331 module_platform_driver(sdhci_tegra_driver);
333 MODULE_DESCRIPTION("SDHCI driver for Tegra");
334 MODULE_AUTHOR("Google, Inc.");
335 MODULE_LICENSE("GPL v2");