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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->dev.platform_data;
52 
53 	if (pdata && pdata->suspend)
54 		pdata->suspend(dev);
55 	clk_disable(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->dev.platform_data;
64 
65 	clk_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_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(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 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 __devinit tc6387xb_probe(struct platform_device *dev)
142 {
143 	struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
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 
154 	tc6387xb = kzalloc(sizeof *tc6387xb, GFP_KERNEL);
155 	if (!tc6387xb)
156 		return -ENOMEM;
157 
158 	ret  = platform_get_irq(dev, 0);
159 	if (ret >= 0)
160 		irq = ret;
161 	else
162 		goto err_no_irq;
163 
164 	clk32k = clk_get(&dev->dev, "CLK_CK32K");
165 	if (IS_ERR(clk32k)) {
166 		ret = PTR_ERR(clk32k);
167 		goto err_no_clk;
168 	}
169 
170 	rscr = &tc6387xb->rscr;
171 	rscr->name = "tc6387xb-core";
172 	rscr->start = iomem->start;
173 	rscr->end = iomem->start + 0xff;
174 	rscr->flags = IORESOURCE_MEM;
175 
176 	ret = request_resource(iomem, rscr);
177 	if (ret)
178 		goto err_resource;
179 
180 	tc6387xb->scr = ioremap(rscr->start, resource_size(rscr));
181 	if (!tc6387xb->scr) {
182 		ret = -ENOMEM;
183 		goto err_ioremap;
184 	}
185 
186 	tc6387xb->clk32k = clk32k;
187 	platform_set_drvdata(dev, tc6387xb);
188 
189 	if (pdata && pdata->enable)
190 		pdata->enable(dev);
191 
192 	printk(KERN_INFO "Toshiba tc6387xb initialised\n");
193 
194 	ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells,
195 			      ARRAY_SIZE(tc6387xb_cells), iomem, irq);
196 
197 	if (!ret)
198 		return 0;
199 
200 	iounmap(tc6387xb->scr);
201 err_ioremap:
202 	release_resource(&tc6387xb->rscr);
203 err_resource:
204 	clk_put(clk32k);
205 err_no_clk:
206 err_no_irq:
207 	kfree(tc6387xb);
208 	return ret;
209 }
210 
tc6387xb_remove(struct platform_device * dev)211 static int __devexit tc6387xb_remove(struct platform_device *dev)
212 {
213 	struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
214 
215 	mfd_remove_devices(&dev->dev);
216 	iounmap(tc6387xb->scr);
217 	release_resource(&tc6387xb->rscr);
218 	clk_disable(tc6387xb->clk32k);
219 	clk_put(tc6387xb->clk32k);
220 	platform_set_drvdata(dev, NULL);
221 	kfree(tc6387xb);
222 
223 	return 0;
224 }
225 
226 
227 static struct platform_driver tc6387xb_platform_driver = {
228 	.driver = {
229 		.name		= "tc6387xb",
230 	},
231 	.probe		= tc6387xb_probe,
232 	.remove		= __devexit_p(tc6387xb_remove),
233 	.suspend        = tc6387xb_suspend,
234 	.resume         = tc6387xb_resume,
235 };
236 
237 module_platform_driver(tc6387xb_platform_driver);
238 
239 MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
240 MODULE_LICENSE("GPL v2");
241 MODULE_AUTHOR("Ian Molton");
242 MODULE_ALIAS("platform:tc6387xb");
243 
244