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13#include <linux/delay.h>
14#include <linux/device.h>
15#include <linux/mfd/core.h>
16#include <linux/mfd/tmio.h>
17#include <linux/mmc/host.h>
18#include <linux/module.h>
19#include <linux/pagemap.h>
20#include <linux/scatterlist.h>
21
22#include "tmio_mmc.h"
23
24
25#define CTL_SDIO_REGS 0x100
26#define CTL_CLK_AND_WAIT_CTL 0x138
27#define CTL_RESET_SDIO 0x1e0
28
29static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
30{
31 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
32 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
33
34 usleep_range(10000, 11000);
35 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
36 usleep_range(10000, 11000);
37}
38
39static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
40{
41 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
42 usleep_range(10000, 11000);
43
44 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
45 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
46
47 usleep_range(10000, 11000);
48}
49
50static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
51 unsigned int new_clock)
52{
53 unsigned int divisor;
54 u32 clk = 0;
55 int clk_sel;
56
57 if (new_clock == 0) {
58 tmio_mmc_clk_stop(host);
59 return;
60 }
61
62 divisor = host->pdata->hclk / new_clock;
63
64
65 clk_sel = (divisor <= 1);
66 clk = clk_sel ? 0 : (roundup_pow_of_two(divisor) >> 2);
67
68 host->pdata->set_clk_div(host->pdev, clk_sel);
69
70 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
71 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
72 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
73 usleep_range(10000, 11000);
74
75 tmio_mmc_clk_start(host);
76}
77
78static void tmio_mmc_reset(struct tmio_mmc_host *host)
79{
80 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
81 usleep_range(10000, 11000);
82 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
83 usleep_range(10000, 11000);
84}
85
86#ifdef CONFIG_PM_SLEEP
87static int tmio_mmc_suspend(struct device *dev)
88{
89 struct platform_device *pdev = to_platform_device(dev);
90 const struct mfd_cell *cell = mfd_get_cell(pdev);
91 int ret;
92
93 ret = pm_runtime_force_suspend(dev);
94
95
96 if (!ret && cell->disable)
97 cell->disable(pdev);
98
99 return ret;
100}
101
102static int tmio_mmc_resume(struct device *dev)
103{
104 struct platform_device *pdev = to_platform_device(dev);
105 const struct mfd_cell *cell = mfd_get_cell(pdev);
106 int ret = 0;
107
108
109 if (cell->resume)
110 ret = cell->resume(pdev);
111
112 if (!ret)
113 ret = pm_runtime_force_resume(dev);
114
115 return ret;
116}
117#endif
118
119static int tmio_mmc_probe(struct platform_device *pdev)
120{
121 const struct mfd_cell *cell = mfd_get_cell(pdev);
122 struct tmio_mmc_data *pdata;
123 struct tmio_mmc_host *host;
124 struct resource *res;
125 int ret = -EINVAL, irq;
126
127 if (pdev->num_resources != 2)
128 goto out;
129
130 pdata = pdev->dev.platform_data;
131 if (!pdata || !pdata->hclk)
132 goto out;
133
134 irq = platform_get_irq(pdev, 0);
135 if (irq < 0) {
136 ret = irq;
137 goto out;
138 }
139
140
141 if (cell->enable) {
142 ret = cell->enable(pdev);
143 if (ret)
144 goto out;
145 }
146
147 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
148 if (!res) {
149 ret = -EINVAL;
150 goto cell_disable;
151 }
152
153 host = tmio_mmc_host_alloc(pdev, pdata);
154 if (IS_ERR(host)) {
155 ret = PTR_ERR(host);
156 goto cell_disable;
157 }
158
159
160 host->bus_shift = resource_size(res) >> 10;
161 host->set_clock = tmio_mmc_set_clock;
162 host->reset = tmio_mmc_reset;
163
164 host->mmc->f_max = pdata->hclk;
165 host->mmc->f_min = pdata->hclk / 512;
166
167 ret = tmio_mmc_host_probe(host);
168 if (ret)
169 goto host_free;
170
171 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq,
172 IRQF_TRIGGER_FALLING,
173 dev_name(&pdev->dev), host);
174 if (ret)
175 goto host_remove;
176
177 pr_info("%s at 0x%p irq %d\n", mmc_hostname(host->mmc), host->ctl, irq);
178
179 return 0;
180
181host_remove:
182 tmio_mmc_host_remove(host);
183host_free:
184 tmio_mmc_host_free(host);
185cell_disable:
186 if (cell->disable)
187 cell->disable(pdev);
188out:
189 return ret;
190}
191
192static int tmio_mmc_remove(struct platform_device *pdev)
193{
194 const struct mfd_cell *cell = mfd_get_cell(pdev);
195 struct tmio_mmc_host *host = platform_get_drvdata(pdev);
196
197 tmio_mmc_host_remove(host);
198 if (cell->disable)
199 cell->disable(pdev);
200
201 return 0;
202}
203
204
205
206static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
207 SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
208 SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
209 tmio_mmc_host_runtime_resume, NULL)
210};
211
212static struct platform_driver tmio_mmc_driver = {
213 .driver = {
214 .name = "tmio-mmc",
215 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
216 .pm = &tmio_mmc_dev_pm_ops,
217 },
218 .probe = tmio_mmc_probe,
219 .remove = tmio_mmc_remove,
220};
221
222module_platform_driver(tmio_mmc_driver);
223
224MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
225MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
226MODULE_LICENSE("GPL v2");
227MODULE_ALIAS("platform:tmio-mmc");
228
