1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Toshiba TC6387XB support
4 * Copyright (c) 2005 Ian Molton
5 *
6 * This file contains TC6387XB base support.
7 */
8
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/clk.h>
12 #include <linux/err.h>
13 #include <linux/mfd/core.h>
14 #include <linux/mfd/tmio.h>
15 #include <linux/mfd/tc6387xb.h>
16 #include <linux/slab.h>
17
18 enum {
19 TC6387XB_CELL_MMC,
20 };
21
22 struct tc6387xb {
23 void __iomem *scr;
24 struct clk *clk32k;
25 struct resource rscr;
26 };
27
28 static const struct resource tc6387xb_mmc_resources[] = {
29 {
30 .start = 0x800,
31 .end = 0x9ff,
32 .flags = IORESOURCE_MEM,
33 },
34 {
35 .start = 0,
36 .end = 0,
37 .flags = IORESOURCE_IRQ,
38 },
39 };
40
41 /*--------------------------------------------------------------------------*/
42
43 #ifdef CONFIG_PM
tc6387xb_suspend(struct platform_device * dev,pm_message_t state)44 static int tc6387xb_suspend(struct platform_device *dev, pm_message_t state)
45 {
46 struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
47 struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
48
49 if (pdata && pdata->suspend)
50 pdata->suspend(dev);
51 clk_disable_unprepare(tc6387xb->clk32k);
52
53 return 0;
54 }
55
tc6387xb_resume(struct platform_device * dev)56 static int tc6387xb_resume(struct platform_device *dev)
57 {
58 struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
59 struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
60
61 clk_prepare_enable(tc6387xb->clk32k);
62 if (pdata && pdata->resume)
63 pdata->resume(dev);
64
65 tmio_core_mmc_resume(tc6387xb->scr + 0x200, 0,
66 tc6387xb_mmc_resources[0].start & 0xfffe);
67
68 return 0;
69 }
70 #else
71 #define tc6387xb_suspend NULL
72 #define tc6387xb_resume NULL
73 #endif
74
75 /*--------------------------------------------------------------------------*/
76
tc6387xb_mmc_pwr(struct platform_device * mmc,int state)77 static void tc6387xb_mmc_pwr(struct platform_device *mmc, int state)
78 {
79 struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
80
81 tmio_core_mmc_pwr(tc6387xb->scr + 0x200, 0, state);
82 }
83
tc6387xb_mmc_clk_div(struct platform_device * mmc,int state)84 static void tc6387xb_mmc_clk_div(struct platform_device *mmc, int state)
85 {
86 struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
87
88 tmio_core_mmc_clk_div(tc6387xb->scr + 0x200, 0, state);
89 }
90
91
tc6387xb_mmc_enable(struct platform_device * mmc)92 static int tc6387xb_mmc_enable(struct platform_device *mmc)
93 {
94 struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
95
96 clk_prepare_enable(tc6387xb->clk32k);
97
98 tmio_core_mmc_enable(tc6387xb->scr + 0x200, 0,
99 tc6387xb_mmc_resources[0].start & 0xfffe);
100
101 return 0;
102 }
103
tc6387xb_mmc_disable(struct platform_device * mmc)104 static int tc6387xb_mmc_disable(struct platform_device *mmc)
105 {
106 struct tc6387xb *tc6387xb = dev_get_drvdata(mmc->dev.parent);
107
108 clk_disable_unprepare(tc6387xb->clk32k);
109
110 return 0;
111 }
112
113 static struct tmio_mmc_data tc6387xb_mmc_data = {
114 .hclk = 24000000,
115 .set_pwr = tc6387xb_mmc_pwr,
116 .set_clk_div = tc6387xb_mmc_clk_div,
117 };
118
119 /*--------------------------------------------------------------------------*/
120
121 static const struct mfd_cell tc6387xb_cells[] = {
122 [TC6387XB_CELL_MMC] = {
123 .name = "tmio-mmc",
124 .enable = tc6387xb_mmc_enable,
125 .disable = tc6387xb_mmc_disable,
126 .platform_data = &tc6387xb_mmc_data,
127 .pdata_size = sizeof(tc6387xb_mmc_data),
128 .num_resources = ARRAY_SIZE(tc6387xb_mmc_resources),
129 .resources = tc6387xb_mmc_resources,
130 },
131 };
132
tc6387xb_probe(struct platform_device * dev)133 static int tc6387xb_probe(struct platform_device *dev)
134 {
135 struct tc6387xb_platform_data *pdata = dev_get_platdata(&dev->dev);
136 struct resource *iomem, *rscr;
137 struct clk *clk32k;
138 struct tc6387xb *tc6387xb;
139 int irq, ret;
140
141 iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
142 if (!iomem)
143 return -EINVAL;
144
145 tc6387xb = kzalloc(sizeof(*tc6387xb), GFP_KERNEL);
146 if (!tc6387xb)
147 return -ENOMEM;
148
149 ret = platform_get_irq(dev, 0);
150 if (ret >= 0)
151 irq = ret;
152 else
153 goto err_no_irq;
154
155 clk32k = clk_get(&dev->dev, "CLK_CK32K");
156 if (IS_ERR(clk32k)) {
157 ret = PTR_ERR(clk32k);
158 goto err_no_clk;
159 }
160
161 rscr = &tc6387xb->rscr;
162 rscr->name = "tc6387xb-core";
163 rscr->start = iomem->start;
164 rscr->end = iomem->start + 0xff;
165 rscr->flags = IORESOURCE_MEM;
166
167 ret = request_resource(iomem, rscr);
168 if (ret)
169 goto err_resource;
170
171 tc6387xb->scr = ioremap(rscr->start, resource_size(rscr));
172 if (!tc6387xb->scr) {
173 ret = -ENOMEM;
174 goto err_ioremap;
175 }
176
177 tc6387xb->clk32k = clk32k;
178 platform_set_drvdata(dev, tc6387xb);
179
180 if (pdata && pdata->enable)
181 pdata->enable(dev);
182
183 dev_info(&dev->dev, "Toshiba tc6387xb initialised\n");
184
185 ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells,
186 ARRAY_SIZE(tc6387xb_cells), iomem, irq, NULL);
187
188 if (!ret)
189 return 0;
190
191 iounmap(tc6387xb->scr);
192 err_ioremap:
193 release_resource(&tc6387xb->rscr);
194 err_resource:
195 clk_put(clk32k);
196 err_no_clk:
197 err_no_irq:
198 kfree(tc6387xb);
199 return ret;
200 }
201
tc6387xb_remove(struct platform_device * dev)202 static int tc6387xb_remove(struct platform_device *dev)
203 {
204 struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
205
206 mfd_remove_devices(&dev->dev);
207 iounmap(tc6387xb->scr);
208 release_resource(&tc6387xb->rscr);
209 clk_disable_unprepare(tc6387xb->clk32k);
210 clk_put(tc6387xb->clk32k);
211 kfree(tc6387xb);
212
213 return 0;
214 }
215
216
217 static struct platform_driver tc6387xb_platform_driver = {
218 .driver = {
219 .name = "tc6387xb",
220 },
221 .probe = tc6387xb_probe,
222 .remove = tc6387xb_remove,
223 .suspend = tc6387xb_suspend,
224 .resume = tc6387xb_resume,
225 };
226
227 module_platform_driver(tc6387xb_platform_driver);
228
229 MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
230 MODULE_LICENSE("GPL v2");
231 MODULE_AUTHOR("Ian Molton");
232 MODULE_ALIAS("platform:tc6387xb");
233
234