GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / mfd / tc6387xb.c
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
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
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
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
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
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
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
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
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