xref: /openbmc/linux/drivers/mmc/host/sdhci-tegra.c (revision 6774def6)
1 /*
2  * Copyright (C) 2010 Google, Inc.
3  *
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.
7  *
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.
12  *
13  */
14 
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>
20 #include <linux/io.h>
21 #include <linux/of.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>
28 
29 #include "sdhci-pltfm.h"
30 
31 /* Tegra SDHOST controller vendor register definitions */
32 #define SDHCI_TEGRA_VENDOR_MISC_CTRL		0x120
33 #define SDHCI_MISC_CTRL_ENABLE_SDR104		0x8
34 #define SDHCI_MISC_CTRL_ENABLE_SDR50		0x10
35 #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300	0x20
36 #define SDHCI_MISC_CTRL_ENABLE_DDR50		0x200
37 
38 #define NVQUIRK_FORCE_SDHCI_SPEC_200	BIT(0)
39 #define NVQUIRK_ENABLE_BLOCK_GAP_DET	BIT(1)
40 #define NVQUIRK_ENABLE_SDHCI_SPEC_300	BIT(2)
41 #define NVQUIRK_DISABLE_SDR50		BIT(3)
42 #define NVQUIRK_DISABLE_SDR104		BIT(4)
43 #define NVQUIRK_DISABLE_DDR50		BIT(5)
44 
45 struct sdhci_tegra_soc_data {
46 	const struct sdhci_pltfm_data *pdata;
47 	u32 nvquirks;
48 };
49 
50 struct sdhci_tegra {
51 	const struct sdhci_tegra_soc_data *soc_data;
52 	int power_gpio;
53 };
54 
55 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
56 {
57 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
58 	struct sdhci_tegra *tegra_host = pltfm_host->priv;
59 	const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
60 
61 	if (unlikely((soc_data->nvquirks & NVQUIRK_FORCE_SDHCI_SPEC_200) &&
62 			(reg == SDHCI_HOST_VERSION))) {
63 		/* Erratum: Version register is invalid in HW. */
64 		return SDHCI_SPEC_200;
65 	}
66 
67 	return readw(host->ioaddr + reg);
68 }
69 
70 static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
71 {
72 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
73 	struct sdhci_tegra *tegra_host = pltfm_host->priv;
74 	const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
75 
76 	/* Seems like we're getting spurious timeout and crc errors, so
77 	 * disable signalling of them. In case of real errors software
78 	 * timers should take care of eventually detecting them.
79 	 */
80 	if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
81 		val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);
82 
83 	writel(val, host->ioaddr + reg);
84 
85 	if (unlikely((soc_data->nvquirks & NVQUIRK_ENABLE_BLOCK_GAP_DET) &&
86 			(reg == SDHCI_INT_ENABLE))) {
87 		/* Erratum: Must enable block gap interrupt detection */
88 		u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
89 		if (val & SDHCI_INT_CARD_INT)
90 			gap_ctrl |= 0x8;
91 		else
92 			gap_ctrl &= ~0x8;
93 		writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
94 	}
95 }
96 
97 static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host)
98 {
99 	return mmc_gpio_get_ro(host->mmc);
100 }
101 
102 static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask)
103 {
104 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
105 	struct sdhci_tegra *tegra_host = pltfm_host->priv;
106 	const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
107 	u32 misc_ctrl;
108 
109 	sdhci_reset(host, mask);
110 
111 	if (!(mask & SDHCI_RESET_ALL))
112 		return;
113 
114 	misc_ctrl = sdhci_readw(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
115 	/* Erratum: Enable SDHCI spec v3.00 support */
116 	if (soc_data->nvquirks & NVQUIRK_ENABLE_SDHCI_SPEC_300)
117 		misc_ctrl |= SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300;
118 	/* Don't advertise UHS modes which aren't supported yet */
119 	if (soc_data->nvquirks & NVQUIRK_DISABLE_SDR50)
120 		misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_SDR50;
121 	if (soc_data->nvquirks & NVQUIRK_DISABLE_DDR50)
122 		misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_DDR50;
123 	if (soc_data->nvquirks & NVQUIRK_DISABLE_SDR104)
124 		misc_ctrl &= ~SDHCI_MISC_CTRL_ENABLE_SDR104;
125 	sdhci_writew(host, misc_ctrl, SDHCI_TEGRA_VENDOR_MISC_CTRL);
126 }
127 
128 static void tegra_sdhci_set_bus_width(struct sdhci_host *host, int bus_width)
129 {
130 	u32 ctrl;
131 
132 	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
133 	if ((host->mmc->caps & MMC_CAP_8_BIT_DATA) &&
134 	    (bus_width == MMC_BUS_WIDTH_8)) {
135 		ctrl &= ~SDHCI_CTRL_4BITBUS;
136 		ctrl |= SDHCI_CTRL_8BITBUS;
137 	} else {
138 		ctrl &= ~SDHCI_CTRL_8BITBUS;
139 		if (bus_width == MMC_BUS_WIDTH_4)
140 			ctrl |= SDHCI_CTRL_4BITBUS;
141 		else
142 			ctrl &= ~SDHCI_CTRL_4BITBUS;
143 	}
144 	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
145 }
146 
147 static const struct sdhci_ops tegra_sdhci_ops = {
148 	.get_ro     = tegra_sdhci_get_ro,
149 	.read_w     = tegra_sdhci_readw,
150 	.write_l    = tegra_sdhci_writel,
151 	.set_clock  = sdhci_set_clock,
152 	.set_bus_width = tegra_sdhci_set_bus_width,
153 	.reset      = tegra_sdhci_reset,
154 	.set_uhs_signaling = sdhci_set_uhs_signaling,
155 	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
156 };
157 
158 static const struct sdhci_pltfm_data sdhci_tegra20_pdata = {
159 	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
160 		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
161 		  SDHCI_QUIRK_NO_HISPD_BIT |
162 		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
163 		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
164 	.ops  = &tegra_sdhci_ops,
165 };
166 
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,
171 };
172 
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 		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
180 	.ops  = &tegra_sdhci_ops,
181 };
182 
183 static struct sdhci_tegra_soc_data soc_data_tegra30 = {
184 	.pdata = &sdhci_tegra30_pdata,
185 	.nvquirks = NVQUIRK_ENABLE_SDHCI_SPEC_300 |
186 		    NVQUIRK_DISABLE_SDR50 |
187 		    NVQUIRK_DISABLE_SDR104,
188 };
189 
190 static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
191 	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
192 		  SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
193 		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
194 		  SDHCI_QUIRK_NO_HISPD_BIT |
195 		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
196 		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
197 	.ops  = &tegra_sdhci_ops,
198 };
199 
200 static struct sdhci_tegra_soc_data soc_data_tegra114 = {
201 	.pdata = &sdhci_tegra114_pdata,
202 	.nvquirks = NVQUIRK_DISABLE_SDR50 |
203 		    NVQUIRK_DISABLE_DDR50 |
204 		    NVQUIRK_DISABLE_SDR104,
205 };
206 
207 static const struct of_device_id sdhci_tegra_dt_match[] = {
208 	{ .compatible = "nvidia,tegra124-sdhci", .data = &soc_data_tegra114 },
209 	{ .compatible = "nvidia,tegra114-sdhci", .data = &soc_data_tegra114 },
210 	{ .compatible = "nvidia,tegra30-sdhci", .data = &soc_data_tegra30 },
211 	{ .compatible = "nvidia,tegra20-sdhci", .data = &soc_data_tegra20 },
212 	{}
213 };
214 MODULE_DEVICE_TABLE(of, sdhci_tegra_dt_match);
215 
216 static int sdhci_tegra_parse_dt(struct device *dev)
217 {
218 	struct device_node *np = dev->of_node;
219 	struct sdhci_host *host = dev_get_drvdata(dev);
220 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
221 	struct sdhci_tegra *tegra_host = pltfm_host->priv;
222 
223 	tegra_host->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
224 	return mmc_of_parse(host->mmc);
225 }
226 
227 static int sdhci_tegra_probe(struct platform_device *pdev)
228 {
229 	const struct of_device_id *match;
230 	const struct sdhci_tegra_soc_data *soc_data;
231 	struct sdhci_host *host;
232 	struct sdhci_pltfm_host *pltfm_host;
233 	struct sdhci_tegra *tegra_host;
234 	struct clk *clk;
235 	int rc;
236 
237 	match = of_match_device(sdhci_tegra_dt_match, &pdev->dev);
238 	if (!match)
239 		return -EINVAL;
240 	soc_data = match->data;
241 
242 	host = sdhci_pltfm_init(pdev, soc_data->pdata, 0);
243 	if (IS_ERR(host))
244 		return PTR_ERR(host);
245 	pltfm_host = sdhci_priv(host);
246 
247 	tegra_host = devm_kzalloc(&pdev->dev, sizeof(*tegra_host), GFP_KERNEL);
248 	if (!tegra_host) {
249 		dev_err(mmc_dev(host->mmc), "failed to allocate tegra_host\n");
250 		rc = -ENOMEM;
251 		goto err_alloc_tegra_host;
252 	}
253 	tegra_host->soc_data = soc_data;
254 	pltfm_host->priv = tegra_host;
255 
256 	rc = sdhci_tegra_parse_dt(&pdev->dev);
257 	if (rc)
258 		goto err_parse_dt;
259 
260 	if (gpio_is_valid(tegra_host->power_gpio)) {
261 		rc = gpio_request(tegra_host->power_gpio, "sdhci_power");
262 		if (rc) {
263 			dev_err(mmc_dev(host->mmc),
264 				"failed to allocate power gpio\n");
265 			goto err_power_req;
266 		}
267 		gpio_direction_output(tegra_host->power_gpio, 1);
268 	}
269 
270 	clk = clk_get(mmc_dev(host->mmc), NULL);
271 	if (IS_ERR(clk)) {
272 		dev_err(mmc_dev(host->mmc), "clk err\n");
273 		rc = PTR_ERR(clk);
274 		goto err_clk_get;
275 	}
276 	clk_prepare_enable(clk);
277 	pltfm_host->clk = clk;
278 
279 	rc = sdhci_add_host(host);
280 	if (rc)
281 		goto err_add_host;
282 
283 	return 0;
284 
285 err_add_host:
286 	clk_disable_unprepare(pltfm_host->clk);
287 	clk_put(pltfm_host->clk);
288 err_clk_get:
289 	if (gpio_is_valid(tegra_host->power_gpio))
290 		gpio_free(tegra_host->power_gpio);
291 err_power_req:
292 err_parse_dt:
293 err_alloc_tegra_host:
294 	sdhci_pltfm_free(pdev);
295 	return rc;
296 }
297 
298 static int sdhci_tegra_remove(struct platform_device *pdev)
299 {
300 	struct sdhci_host *host = platform_get_drvdata(pdev);
301 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
302 	struct sdhci_tegra *tegra_host = pltfm_host->priv;
303 	int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
304 
305 	sdhci_remove_host(host, dead);
306 
307 	if (gpio_is_valid(tegra_host->power_gpio))
308 		gpio_free(tegra_host->power_gpio);
309 
310 	clk_disable_unprepare(pltfm_host->clk);
311 	clk_put(pltfm_host->clk);
312 
313 	sdhci_pltfm_free(pdev);
314 
315 	return 0;
316 }
317 
318 static struct platform_driver sdhci_tegra_driver = {
319 	.driver		= {
320 		.name	= "sdhci-tegra",
321 		.of_match_table = sdhci_tegra_dt_match,
322 		.pm	= SDHCI_PLTFM_PMOPS,
323 	},
324 	.probe		= sdhci_tegra_probe,
325 	.remove		= sdhci_tegra_remove,
326 };
327 
328 module_platform_driver(sdhci_tegra_driver);
329 
330 MODULE_DESCRIPTION("SDHCI driver for Tegra");
331 MODULE_AUTHOR("Google, Inc.");
332 MODULE_LICENSE("GPL v2");
333