1 /*
2 * Toshiba TC6387XB support
3 * Copyright (c) 2005 Ian Molton
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This file contains TC6387XB base support.
10 *
11 */
12
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/clk.h>
16 #include <linux/err.h>
17 #include <linux/mfd/core.h>
18 #include <linux/mfd/tmio.h>
19 #include <linux/mfd/tc6387xb.h>
20 #include <linux/slab.h>
21
22 enum {
23 TC6387XB_CELL_MMC,
24 };
25
26 struct tc6387xb {
27 void __iomem *scr;
28 struct clk *clk32k;
29 struct resource rscr;
30 };
31
32 static struct resource tc6387xb_mmc_resources[] = {
33 {
34 .start = 0x800,
35 .end = 0x9ff,
36 .flags = IORESOURCE_MEM,
37 },
38 {
39 .start = 0,
40 .end = 0,
41 .flags = IORESOURCE_IRQ,
42 },
43 };
44
45 /*--------------------------------------------------------------------------*/
46
47 #ifdef CONFIG_PM
tc6387xb_suspend(struct platform_device * dev,pm_message_t state)48 static int tc6387xb_suspend(struct platform_device *dev, pm_message_t state)
49 {
50 struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
51 struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
52
53 if (pdata && pdata->suspend)
54 pdata->suspend(dev);
55 clk_disable_unprepare(tc6387xb->clk32k);
56
57 return 0;
58 }
59
tc6387xb_resume(struct platform_device * dev)60 static int tc6387xb_resume(struct platform_device *dev)
61 {
62 struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
63 struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
64
65 clk_prepare_enable(tc6387xb->clk32k);
66 if (pdata && pdata->resume)
67 pdata->resume(dev);
68
69 tmio_core_mmc_resume(tc6387xb->scr + 0x200, 0,
70 tc6387xb_mmc_resources[0].start & 0xfffe);
71
72 return 0;
73 }
74 #else
75 #define tc6387xb_suspend NULL
76 #define tc6387xb_resume NULL
77 #endif
78
79 /*--------------------------------------------------------------------------*/
80
tc6387xb_mmc_pwr(struct platform_device * mmc,int state)81 static void tc6387xb_mmc_pwr(struct platform_device *mmc, int state)
82 {
83 struct platform_device *dev = to_platform_device(mmc->dev.parent);
84 struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
85
86 tmio_core_mmc_pwr(tc6387xb->scr + 0x200, 0, state);
87 }
88
tc6387xb_mmc_clk_div(struct platform_device * mmc,int state)89 static void tc6387xb_mmc_clk_div(struct platform_device *mmc, int state)
90 {
91 struct platform_device *dev = to_platform_device(mmc->dev.parent);
92 struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
93
94 tmio_core_mmc_clk_div(tc6387xb->scr + 0x200, 0, state);
95 }
96
97
tc6387xb_mmc_enable(struct platform_device * mmc)98 static int tc6387xb_mmc_enable(struct platform_device *mmc)
99 {
100 struct platform_device *dev = to_platform_device(mmc->dev.parent);
101 struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
102
103 clk_prepare_enable(tc6387xb->clk32k);
104
105 tmio_core_mmc_enable(tc6387xb->scr + 0x200, 0,
106 tc6387xb_mmc_resources[0].start & 0xfffe);
107
108 return 0;
109 }
110
tc6387xb_mmc_disable(struct platform_device * mmc)111 static int tc6387xb_mmc_disable(struct platform_device *mmc)
112 {
113 struct platform_device *dev = to_platform_device(mmc->dev.parent);
114 struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
115
116 clk_disable_unprepare(tc6387xb->clk32k);
117
118 return 0;
119 }
120
121 static struct tmio_mmc_data tc6387xb_mmc_data = {
122 .hclk = 24000000,
123 .set_pwr = tc6387xb_mmc_pwr,
124 .set_clk_div = tc6387xb_mmc_clk_div,
125 };
126
127 /*--------------------------------------------------------------------------*/
128
129 static const struct mfd_cell tc6387xb_cells[] = {
130 [TC6387XB_CELL_MMC] = {
131 .name = "tmio-mmc",
132 .enable = tc6387xb_mmc_enable,
133 .disable = tc6387xb_mmc_disable,
134 .platform_data = &tc6387xb_mmc_data,
135 .pdata_size = sizeof(tc6387xb_mmc_data),
136 .num_resources = ARRAY_SIZE(tc6387xb_mmc_resources),
137 .resources = tc6387xb_mmc_resources,
138 },
139 };
140
tc6387xb_probe(struct platform_device * dev)141 static int tc6387xb_probe(struct platform_device *dev)
142 {
143 struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
144 struct resource *iomem, *rscr;
145 struct clk *clk32k;
146 struct tc6387xb *tc6387xb;
147 int irq, ret;
148
149 iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
150 if (!iomem)
151 return -EINVAL;
152
153 tc6387xb = kzalloc(sizeof(*tc6387xb), GFP_KERNEL);
154 if (!tc6387xb)
155 return -ENOMEM;
156
157 ret = platform_get_irq(dev, 0);
158 if (ret >= 0)
159 irq = ret;
160 else
161 goto err_no_irq;
162
163 clk32k = clk_get(&dev->dev, "CLK_CK32K");
164 if (IS_ERR(clk32k)) {
165 ret = PTR_ERR(clk32k);
166 goto err_no_clk;
167 }
168
169 rscr = &tc6387xb->rscr;
170 rscr->name = "tc6387xb-core";
171 rscr->start = iomem->start;
172 rscr->end = iomem->start + 0xff;
173 rscr->flags = IORESOURCE_MEM;
174
175 ret = request_resource(iomem, rscr);
176 if (ret)
177 goto err_resource;
178
179 tc6387xb->scr = ioremap(rscr->start, resource_size(rscr));
180 if (!tc6387xb->scr) {
181 ret = -ENOMEM;
182 goto err_ioremap;
183 }
184
185 tc6387xb->clk32k = clk32k;
186 platform_set_drvdata(dev, tc6387xb);
187
188 if (pdata && pdata->enable)
189 pdata->enable(dev);
190
191 dev_info(&dev->dev, "Toshiba tc6387xb initialised\n");
192
193 ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells,
194 ARRAY_SIZE(tc6387xb_cells), iomem, irq, NULL);
195
196 if (!ret)
197 return 0;
198
199 iounmap(tc6387xb->scr);
200 err_ioremap:
201 release_resource(&tc6387xb->rscr);
202 err_resource:
203 clk_put(clk32k);
204 err_no_clk:
205 err_no_irq:
206 kfree(tc6387xb);
207 return ret;
208 }
209
tc6387xb_remove(struct platform_device * dev)210 static int tc6387xb_remove(struct platform_device *dev)
211 {
212 struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
213
214 mfd_remove_devices(&dev->dev);
215 iounmap(tc6387xb->scr);
216 release_resource(&tc6387xb->rscr);
217 clk_disable_unprepare(tc6387xb->clk32k);
218 clk_put(tc6387xb->clk32k);
219 kfree(tc6387xb);
220
221 return 0;
222 }
223
224
225 static struct platform_driver tc6387xb_platform_driver = {
226 .driver = {
227 .name = "tc6387xb",
228 },
229 .probe = tc6387xb_probe,
230 .remove = tc6387xb_remove,
231 .suspend = tc6387xb_suspend,
232 .resume = tc6387xb_resume,
233 };
234
235 module_platform_driver(tc6387xb_platform_driver);
236
237 MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
238 MODULE_LICENSE("GPL v2");
239 MODULE_AUTHOR("Ian Molton");
240 MODULE_ALIAS("platform:tc6387xb");
241
242
