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
 22enum {
 23	TC6387XB_CELL_MMC,
 24};
 25
 26struct tc6387xb {
 27	void __iomem *scr;
 28	struct clk *clk32k;
 29	struct resource rscr;
 30};
 31
 32static 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
 48static 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
 60static 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
 81static 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
 89static 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
 98static 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
111static 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
121static 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
129static 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
141static 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);
200err_ioremap:
201	release_resource(&tc6387xb->rscr);
202err_resource:
203	clk_put(clk32k);
204err_no_clk:
205err_no_irq:
206	kfree(tc6387xb);
207	return ret;
208}
209
210static 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
225static 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
235module_platform_driver(tc6387xb_platform_driver);
236
237MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
238MODULE_LICENSE("GPL v2");
239MODULE_AUTHOR("Ian Molton");
240MODULE_ALIAS("platform:tc6387xb");
241