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