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