tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
45struct sdhci_tegra_soc_data {
46 const struct sdhci_pltfm_data *pdata;
47 u32 nvquirks;
48};
49
50struct sdhci_tegra {
51 const struct sdhci_tegra_soc_data *soc_data;
52 int power_gpio;
53};
54
55static 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
70static 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
97static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host)
98{
99 return mmc_gpio_get_ro(host->mmc);
100}
101
102static 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
128static 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
147static 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
158static 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
167static 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
173static 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
183static 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
190static 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
200static 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
207static 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};
214MODULE_DEVICE_TABLE(of, sdhci_tegra_dt_match);
215
216static 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
227static 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
285err_add_host:
286 clk_disable_unprepare(pltfm_host->clk);
287 clk_put(pltfm_host->clk);
288err_clk_get:
289 if (gpio_is_valid(tegra_host->power_gpio))
290 gpio_free(tegra_host->power_gpio);
291err_power_req:
292err_parse_dt:
293err_alloc_tegra_host:
294 sdhci_pltfm_free(pdev);
295 return rc;
296}
297
298static 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
318static struct platform_driver sdhci_tegra_driver = {
319 .driver = {
320 .name = "sdhci-tegra",
321 .owner = THIS_MODULE,
322 .of_match_table = sdhci_tegra_dt_match,
323 .pm = SDHCI_PLTFM_PMOPS,
324 },
325 .probe = sdhci_tegra_probe,
326 .remove = sdhci_tegra_remove,
327};
328
329module_platform_driver(sdhci_tegra_driver);
330
331MODULE_DESCRIPTION("SDHCI driver for Tegra");
332MODULE_AUTHOR("Google, Inc.");
333MODULE_LICENSE("GPL v2");