1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for the MMC / SD / SDIO cell found in:
4 *
5 * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
6 *
7 * Copyright (C) 2017 Renesas Electronics Corporation
8 * Copyright (C) 2017 Horms Solutions, Simon Horman
9 * Copyright (C) 2007 Ian Molton
10 * Copyright (C) 2004 Ian Molton
11 */
12
13#include <linux/delay.h>
14#include <linux/device.h>
15#include <linux/mfd/core.h>
16#include <linux/mfd/tmio.h>
17#include <linux/mmc/host.h>
18#include <linux/module.h>
19#include <linux/pagemap.h>
20#include <linux/scatterlist.h>
21
22#include "tmio_mmc.h"
23
24/* Registers specific to this variant */
25#define CTL_SDIO_REGS		0x100
26#define CTL_CLK_AND_WAIT_CTL	0x138
27#define CTL_RESET_SDIO		0x1e0
28
29static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
30{
31	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
32		sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
33
34	usleep_range(10000, 11000);
35	sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
36	usleep_range(10000, 11000);
37}
38
39static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
40{
41	sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
42	usleep_range(10000, 11000);
43
44	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
45		sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
46
47	usleep_range(10000, 11000);
48}
49
50static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
51			       unsigned int new_clock)
52{
53	unsigned int divisor;
54	u32 clk = 0;
55	int clk_sel;
56
57	if (new_clock == 0) {
58		tmio_mmc_clk_stop(host);
59		return;
60	}
61
62	divisor = host->pdata->hclk / new_clock;
63
64	/* bit7 set: 1/512, ... bit0 set: 1/4, all bits clear: 1/2 */
65	clk_sel = (divisor <= 1);
66	clk = clk_sel ? 0 : (roundup_pow_of_two(divisor) >> 2);
67
68	host->pdata->set_clk_div(host->pdev, clk_sel);
69
70	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
71			sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
72	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
73	usleep_range(10000, 11000);
74
75	tmio_mmc_clk_start(host);
76}
77
78static void tmio_mmc_reset(struct tmio_mmc_host *host)
79{
80	sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
81	usleep_range(10000, 11000);
82	sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
83	usleep_range(10000, 11000);
84}
85
86#ifdef CONFIG_PM_SLEEP
87static int tmio_mmc_suspend(struct device *dev)
88{
89	struct platform_device *pdev = to_platform_device(dev);
90	const struct mfd_cell *cell = mfd_get_cell(pdev);
91	int ret;
92
93	ret = pm_runtime_force_suspend(dev);
94
95	/* Tell MFD core it can disable us now.*/
96	if (!ret && cell->disable)
97		cell->disable(pdev);
98
99	return ret;
100}
101
102static int tmio_mmc_resume(struct device *dev)
103{
104	struct platform_device *pdev = to_platform_device(dev);
105	const struct mfd_cell *cell = mfd_get_cell(pdev);
106	int ret = 0;
107
108	/* Tell the MFD core we are ready to be enabled */
109	if (cell->resume)
110		ret = cell->resume(pdev);
111
112	if (!ret)
113		ret = pm_runtime_force_resume(dev);
114
115	return ret;
116}
117#endif
118
119static int tmio_mmc_probe(struct platform_device *pdev)
120{
121	const struct mfd_cell *cell = mfd_get_cell(pdev);
122	struct tmio_mmc_data *pdata;
123	struct tmio_mmc_host *host;
124	struct resource *res;
125	int ret = -EINVAL, irq;
126
127	if (pdev->num_resources != 2)
128		goto out;
129
130	pdata = pdev->dev.platform_data;
131	if (!pdata || !pdata->hclk)
132		goto out;
133
134	irq = platform_get_irq(pdev, 0);
135	if (irq < 0) {
136		ret = irq;
137		goto out;
138	}
139
140	/* Tell the MFD core we are ready to be enabled */
141	if (cell->enable) {
142		ret = cell->enable(pdev);
143		if (ret)
144			goto out;
145	}
146
147	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
148	if (!res) {
149		ret = -EINVAL;
150		goto cell_disable;
151	}
152
153	host = tmio_mmc_host_alloc(pdev, pdata);
154	if (IS_ERR(host)) {
155		ret = PTR_ERR(host);
156		goto cell_disable;
157	}
158
159	/* SD control register space size is 0x200, 0x400 for bus_shift=1 */
160	host->bus_shift = resource_size(res) >> 10;
161	host->set_clock = tmio_mmc_set_clock;
162	host->reset = tmio_mmc_reset;
163
164	host->mmc->f_max = pdata->hclk;
165	host->mmc->f_min = pdata->hclk / 512;
166
167	ret = tmio_mmc_host_probe(host);
168	if (ret)
169		goto host_free;
170
171	ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq,
172			       IRQF_TRIGGER_FALLING,
173			       dev_name(&pdev->dev), host);
174	if (ret)
175		goto host_remove;
176
177	pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
178		(unsigned long)host->ctl, irq);
179
180	return 0;
181
182host_remove:
183	tmio_mmc_host_remove(host);
184host_free:
185	tmio_mmc_host_free(host);
186cell_disable:
187	if (cell->disable)
188		cell->disable(pdev);
189out:
190	return ret;
191}
192
193static int tmio_mmc_remove(struct platform_device *pdev)
194{
195	const struct mfd_cell *cell = mfd_get_cell(pdev);
196	struct tmio_mmc_host *host = platform_get_drvdata(pdev);
197
198	tmio_mmc_host_remove(host);
199	if (cell->disable)
200		cell->disable(pdev);
201
202	return 0;
203}
204
205/* ------------------- device registration ----------------------- */
206
207static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
208	SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
209	SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
210			   tmio_mmc_host_runtime_resume, NULL)
211};
212
213static struct platform_driver tmio_mmc_driver = {
214	.driver = {
215		.name = "tmio-mmc",
216		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
217		.pm = &tmio_mmc_dev_pm_ops,
218	},
219	.probe = tmio_mmc_probe,
220	.remove = tmio_mmc_remove,
221};
222
223module_platform_driver(tmio_mmc_driver);
224
225MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
226MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
227MODULE_LICENSE("GPL v2");
228MODULE_ALIAS("platform:tmio-mmc");
229