Loading...
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 <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/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/slot-gpio.h>
30#include <linux/io.h>
31#include "sdhci.h"
32
33struct spear_sdhci {
34 struct clk *clk;
35 int card_int_gpio;
36};
37
38/* sdhci ops */
39static const struct sdhci_ops sdhci_pltfm_ops = {
40 .set_clock = sdhci_set_clock,
41 .set_bus_width = sdhci_set_bus_width,
42 .reset = sdhci_reset,
43 .set_uhs_signaling = sdhci_set_uhs_signaling,
44};
45
46static void sdhci_probe_config_dt(struct device_node *np,
47 struct spear_sdhci *host)
48{
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 host->card_int_gpio = cd_gpio;
56}
57
58static int sdhci_probe(struct platform_device *pdev)
59{
60 struct sdhci_host *host;
61 struct resource *iomem;
62 struct spear_sdhci *sdhci;
63 struct device *dev;
64 int ret;
65
66 dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
67 host = sdhci_alloc_host(dev, sizeof(*sdhci));
68 if (IS_ERR(host)) {
69 ret = PTR_ERR(host);
70 dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
71 goto err;
72 }
73
74 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
75 host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
76 if (IS_ERR(host->ioaddr)) {
77 ret = PTR_ERR(host->ioaddr);
78 dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
79 goto err_host;
80 }
81
82 host->hw_name = "sdhci";
83 host->ops = &sdhci_pltfm_ops;
84 host->irq = platform_get_irq(pdev, 0);
85 if (host->irq <= 0) {
86 ret = -EINVAL;
87 goto err_host;
88 }
89 host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
90
91 sdhci = sdhci_priv(host);
92
93 /* clk enable */
94 sdhci->clk = devm_clk_get(&pdev->dev, NULL);
95 if (IS_ERR(sdhci->clk)) {
96 ret = PTR_ERR(sdhci->clk);
97 dev_dbg(&pdev->dev, "Error getting clock\n");
98 goto err_host;
99 }
100
101 ret = clk_prepare_enable(sdhci->clk);
102 if (ret) {
103 dev_dbg(&pdev->dev, "Error enabling clock\n");
104 goto err_host;
105 }
106
107 ret = clk_set_rate(sdhci->clk, 50000000);
108 if (ret)
109 dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
110 clk_get_rate(sdhci->clk));
111
112 sdhci_probe_config_dt(pdev->dev.of_node, sdhci);
113 /*
114 * It is optional to use GPIOs for sdhci card detection. If
115 * sdhci->card_int_gpio < 0, then use original sdhci lines otherwise
116 * GPIO lines. We use the built-in GPIO support for this.
117 */
118 if (sdhci->card_int_gpio >= 0) {
119 ret = mmc_gpio_request_cd(host->mmc, sdhci->card_int_gpio, 0);
120 if (ret < 0) {
121 dev_dbg(&pdev->dev,
122 "failed to request card-detect gpio%d\n",
123 sdhci->card_int_gpio);
124 goto disable_clk;
125 }
126 }
127
128 ret = sdhci_add_host(host);
129 if (ret) {
130 dev_dbg(&pdev->dev, "error adding host\n");
131 goto disable_clk;
132 }
133
134 platform_set_drvdata(pdev, host);
135
136 return 0;
137
138disable_clk:
139 clk_disable_unprepare(sdhci->clk);
140err_host:
141 sdhci_free_host(host);
142err:
143 dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
144 return ret;
145}
146
147static int sdhci_remove(struct platform_device *pdev)
148{
149 struct sdhci_host *host = platform_get_drvdata(pdev);
150 struct spear_sdhci *sdhci = sdhci_priv(host);
151 int dead = 0;
152 u32 scratch;
153
154 scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
155 if (scratch == (u32)-1)
156 dead = 1;
157
158 sdhci_remove_host(host, dead);
159 clk_disable_unprepare(sdhci->clk);
160 sdhci_free_host(host);
161
162 return 0;
163}
164
165#ifdef CONFIG_PM_SLEEP
166static int sdhci_suspend(struct device *dev)
167{
168 struct sdhci_host *host = dev_get_drvdata(dev);
169 struct spear_sdhci *sdhci = sdhci_priv(host);
170 int ret;
171
172 if (host->tuning_mode != SDHCI_TUNING_MODE_3)
173 mmc_retune_needed(host->mmc);
174
175 ret = sdhci_suspend_host(host);
176 if (!ret)
177 clk_disable(sdhci->clk);
178
179 return ret;
180}
181
182static int sdhci_resume(struct device *dev)
183{
184 struct sdhci_host *host = dev_get_drvdata(dev);
185 struct spear_sdhci *sdhci = sdhci_priv(host);
186 int ret;
187
188 ret = clk_enable(sdhci->clk);
189 if (ret) {
190 dev_dbg(dev, "Resume: Error enabling clock\n");
191 return ret;
192 }
193
194 return sdhci_resume_host(host);
195}
196#endif
197
198static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume);
199
200#ifdef CONFIG_OF
201static const struct of_device_id sdhci_spear_id_table[] = {
202 { .compatible = "st,spear300-sdhci" },
203 {}
204};
205MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
206#endif
207
208static struct platform_driver sdhci_driver = {
209 .driver = {
210 .name = "sdhci",
211 .pm = &sdhci_pm_ops,
212 .of_match_table = of_match_ptr(sdhci_spear_id_table),
213 },
214 .probe = sdhci_probe,
215 .remove = sdhci_remove,
216};
217
218module_platform_driver(sdhci_driver);
219
220MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
221MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>");
222MODULE_LICENSE("GPL v2");