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1/*
2 * drivers/mmc/host/sdhci-spear.c
3 *
4 * Support of SDHCI platform devices for spear soc family
5 *
6 * Copyright (C) 2010 ST Microelectronics
7 * Viresh Kumar <vireshk@kernel.org>
8 *
9 * Inspired by sdhci-pltfm.c
10 *
11 * This file is licensed under the terms of the GNU General Public
12 * License version 2. This program is licensed "as is" without any
13 * warranty of any kind, whether express or implied.
14 */
15
16#include <linux/clk.h>
17#include <linux/delay.h>
18#include <linux/highmem.h>
19#include <linux/module.h>
20#include <linux/interrupt.h>
21#include <linux/irq.h>
22#include <linux/of.h>
23#include <linux/platform_device.h>
24#include <linux/pm.h>
25#include <linux/slab.h>
26#include <linux/mmc/host.h>
27#include <linux/mmc/slot-gpio.h>
28#include <linux/io.h>
29#include "sdhci.h"
30
31struct spear_sdhci {
32 struct clk *clk;
33};
34
35/* sdhci ops */
36static const struct sdhci_ops sdhci_pltfm_ops = {
37 .set_clock = sdhci_set_clock,
38 .set_bus_width = sdhci_set_bus_width,
39 .reset = sdhci_reset,
40 .set_uhs_signaling = sdhci_set_uhs_signaling,
41};
42
43static int sdhci_probe(struct platform_device *pdev)
44{
45 struct sdhci_host *host;
46 struct spear_sdhci *sdhci;
47 struct device *dev;
48 int ret;
49
50 dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
51 host = sdhci_alloc_host(dev, sizeof(*sdhci));
52 if (IS_ERR(host)) {
53 ret = PTR_ERR(host);
54 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
55 goto err;
56 }
57
58 host->ioaddr = devm_platform_ioremap_resource(pdev, 0);
59 if (IS_ERR(host->ioaddr)) {
60 ret = PTR_ERR(host->ioaddr);
61 dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
62 goto err_host;
63 }
64
65 host->hw_name = "sdhci";
66 host->ops = &sdhci_pltfm_ops;
67 host->irq = platform_get_irq(pdev, 0);
68 if (host->irq <= 0) {
69 ret = -EINVAL;
70 goto err_host;
71 }
72 host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
73
74 sdhci = sdhci_priv(host);
75
76 /* clk enable */
77 sdhci->clk = devm_clk_get(&pdev->dev, NULL);
78 if (IS_ERR(sdhci->clk)) {
79 ret = PTR_ERR(sdhci->clk);
80 dev_dbg(&pdev->dev, "Error getting clock\n");
81 goto err_host;
82 }
83
84 ret = clk_prepare_enable(sdhci->clk);
85 if (ret) {
86 dev_dbg(&pdev->dev, "Error enabling clock\n");
87 goto err_host;
88 }
89
90 ret = clk_set_rate(sdhci->clk, 50000000);
91 if (ret)
92 dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
93 clk_get_rate(sdhci->clk));
94
95 /*
96 * It is optional to use GPIOs for sdhci card detection. If we
97 * find a descriptor using slot GPIO, we use it.
98 */
99 ret = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0);
100 if (ret == -EPROBE_DEFER)
101 goto disable_clk;
102
103 ret = sdhci_add_host(host);
104 if (ret)
105 goto disable_clk;
106
107 platform_set_drvdata(pdev, host);
108
109 return 0;
110
111disable_clk:
112 clk_disable_unprepare(sdhci->clk);
113err_host:
114 sdhci_free_host(host);
115err:
116 dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
117 return ret;
118}
119
120static int sdhci_remove(struct platform_device *pdev)
121{
122 struct sdhci_host *host = platform_get_drvdata(pdev);
123 struct spear_sdhci *sdhci = sdhci_priv(host);
124 int dead = 0;
125 u32 scratch;
126
127 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
128 if (scratch == (u32)-1)
129 dead = 1;
130
131 sdhci_remove_host(host, dead);
132 clk_disable_unprepare(sdhci->clk);
133 sdhci_free_host(host);
134
135 return 0;
136}
137
138#ifdef CONFIG_PM_SLEEP
139static int sdhci_suspend(struct device *dev)
140{
141 struct sdhci_host *host = dev_get_drvdata(dev);
142 struct spear_sdhci *sdhci = sdhci_priv(host);
143 int ret;
144
145 if (host->tuning_mode != SDHCI_TUNING_MODE_3)
146 mmc_retune_needed(host->mmc);
147
148 ret = sdhci_suspend_host(host);
149 if (!ret)
150 clk_disable(sdhci->clk);
151
152 return ret;
153}
154
155static int sdhci_resume(struct device *dev)
156{
157 struct sdhci_host *host = dev_get_drvdata(dev);
158 struct spear_sdhci *sdhci = sdhci_priv(host);
159 int ret;
160
161 ret = clk_enable(sdhci->clk);
162 if (ret) {
163 dev_dbg(dev, "Resume: Error enabling clock\n");
164 return ret;
165 }
166
167 return sdhci_resume_host(host);
168}
169#endif
170
171static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
172
173#ifdef CONFIG_OF
174static const struct of_device_id sdhci_spear_id_table[] = {
175 { .compatible = "st,spear300-sdhci" },
176 {}
177};
178MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
179#endif
180
181static struct platform_driver sdhci_driver = {
182 .driver = {
183 .name = "sdhci",
184 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
185 .pm = &sdhci_pm_ops,
186 .of_match_table = of_match_ptr(sdhci_spear_id_table),
187 },
188 .probe = sdhci_probe,
189 .remove = sdhci_remove,
190};
191
192module_platform_driver(sdhci_driver);
193
194MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
195MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>");
196MODULE_LICENSE("GPL v2");
1/*
2 * drivers/mmc/host/sdhci-spear.c
3 *
4 * Support of SDHCI platform devices for spear soc family
5 *
6 * Copyright (C) 2010 ST Microelectronics
7 * Viresh Kumar <viresh.linux@gmail.com>
8 *
9 * Inspired by sdhci-pltfm.c
10 *
11 * This file is licensed under the terms of the GNU General Public
12 * License version 2. This program is licensed "as is" without any
13 * warranty of any kind, whether express or implied.
14 */
15
16#include <linux/clk.h>
17#include <linux/delay.h>
18#include <linux/gpio.h>
19#include <linux/highmem.h>
20#include <linux/module.h>
21#include <linux/interrupt.h>
22#include <linux/irq.h>
23#include <linux/of.h>
24#include <linux/of_gpio.h>
25#include <linux/platform_device.h>
26#include <linux/pm.h>
27#include <linux/slab.h>
28#include <linux/mmc/host.h>
29#include <linux/mmc/sdhci-spear.h>
30#include <linux/mmc/slot-gpio.h>
31#include <linux/io.h>
32#include "sdhci.h"
33
34struct spear_sdhci {
35 struct clk *clk;
36 struct sdhci_plat_data *data;
37};
38
39/* sdhci ops */
40static const struct sdhci_ops sdhci_pltfm_ops = {
41 /* Nothing to do for now. */
42};
43
44#ifdef CONFIG_OF
45static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
46{
47 struct device_node *np = pdev->dev.of_node;
48 struct sdhci_plat_data *pdata = NULL;
49 int cd_gpio;
50
51 cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
52 if (!gpio_is_valid(cd_gpio))
53 cd_gpio = -1;
54
55 /* If pdata is required */
56 if (cd_gpio != -1) {
57 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
58 if (!pdata)
59 dev_err(&pdev->dev, "DT: kzalloc failed\n");
60 else
61 pdata->card_int_gpio = cd_gpio;
62 }
63
64 return pdata;
65}
66#else
67static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev)
68{
69 return ERR_PTR(-ENOSYS);
70}
71#endif
72
73static int sdhci_probe(struct platform_device *pdev)
74{
75 struct device_node *np = pdev->dev.of_node;
76 struct sdhci_host *host;
77 struct resource *iomem;
78 struct spear_sdhci *sdhci;
79 struct device *dev;
80 int ret;
81
82 dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
83 host = sdhci_alloc_host(dev, sizeof(*sdhci));
84 if (IS_ERR(host)) {
85 ret = PTR_ERR(host);
86 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
87 goto err;
88 }
89
90 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
91 host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
92 if (IS_ERR(host->ioaddr)) {
93 ret = PTR_ERR(host->ioaddr);
94 dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
95 goto err_host;
96 }
97
98 host->hw_name = "sdhci";
99 host->ops = &sdhci_pltfm_ops;
100 host->irq = platform_get_irq(pdev, 0);
101 host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
102
103 sdhci = sdhci_priv(host);
104
105 /* clk enable */
106 sdhci->clk = devm_clk_get(&pdev->dev, NULL);
107 if (IS_ERR(sdhci->clk)) {
108 ret = PTR_ERR(sdhci->clk);
109 dev_dbg(&pdev->dev, "Error getting clock\n");
110 goto err_host;
111 }
112
113 ret = clk_prepare_enable(sdhci->clk);
114 if (ret) {
115 dev_dbg(&pdev->dev, "Error enabling clock\n");
116 goto err_host;
117 }
118
119 ret = clk_set_rate(sdhci->clk, 50000000);
120 if (ret)
121 dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
122 clk_get_rate(sdhci->clk));
123
124 if (np) {
125 sdhci->data = sdhci_probe_config_dt(pdev);
126 if (IS_ERR(sdhci->data)) {
127 dev_err(&pdev->dev, "DT: Failed to get pdata\n");
128 goto disable_clk;
129 }
130 } else {
131 sdhci->data = dev_get_platdata(&pdev->dev);
132 }
133
134 /*
135 * It is optional to use GPIOs for sdhci card detection. If
136 * sdhci->data is NULL, then use original sdhci lines otherwise
137 * GPIO lines. We use the built-in GPIO support for this.
138 */
139 if (sdhci->data && sdhci->data->card_int_gpio >= 0) {
140 ret = mmc_gpio_request_cd(host->mmc,
141 sdhci->data->card_int_gpio, 0);
142 if (ret < 0) {
143 dev_dbg(&pdev->dev,
144 "failed to request card-detect gpio%d\n",
145 sdhci->data->card_int_gpio);
146 goto disable_clk;
147 }
148 }
149
150 ret = sdhci_add_host(host);
151 if (ret) {
152 dev_dbg(&pdev->dev, "error adding host\n");
153 goto disable_clk;
154 }
155
156 platform_set_drvdata(pdev, host);
157
158 return 0;
159
160disable_clk:
161 clk_disable_unprepare(sdhci->clk);
162err_host:
163 sdhci_free_host(host);
164err:
165 dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
166 return ret;
167}
168
169static int sdhci_remove(struct platform_device *pdev)
170{
171 struct sdhci_host *host = platform_get_drvdata(pdev);
172 struct spear_sdhci *sdhci = sdhci_priv(host);
173 int dead = 0;
174 u32 scratch;
175
176 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
177 if (scratch == (u32)-1)
178 dead = 1;
179
180 sdhci_remove_host(host, dead);
181 clk_disable_unprepare(sdhci->clk);
182 sdhci_free_host(host);
183
184 return 0;
185}
186
187#ifdef CONFIG_PM_SLEEP
188static int sdhci_suspend(struct device *dev)
189{
190 struct sdhci_host *host = dev_get_drvdata(dev);
191 struct spear_sdhci *sdhci = sdhci_priv(host);
192 int ret;
193
194 ret = sdhci_suspend_host(host);
195 if (!ret)
196 clk_disable(sdhci->clk);
197
198 return ret;
199}
200
201static int sdhci_resume(struct device *dev)
202{
203 struct sdhci_host *host = dev_get_drvdata(dev);
204 struct spear_sdhci *sdhci = sdhci_priv(host);
205 int ret;
206
207 ret = clk_enable(sdhci->clk);
208 if (ret) {
209 dev_dbg(dev, "Resume: Error enabling clock\n");
210 return ret;
211 }
212
213 return sdhci_resume_host(host);
214}
215#endif
216
217static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
218
219#ifdef CONFIG_OF
220static const struct of_device_id sdhci_spear_id_table[] = {
221 { .compatible = "st,spear300-sdhci" },
222 {}
223};
224MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
225#endif
226
227static struct platform_driver sdhci_driver = {
228 .driver = {
229 .name = "sdhci",
230 .owner = THIS_MODULE,
231 .pm = &sdhci_pm_ops,
232 .of_match_table = of_match_ptr(sdhci_spear_id_table),
233 },
234 .probe = sdhci_probe,
235 .remove = sdhci_remove,
236};
237
238module_platform_driver(sdhci_driver);
239
240MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
241MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
242MODULE_LICENSE("GPL v2");