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	/* FIXME - should we set stop clock reg here */
 81	sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
 82	sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
 83	usleep_range(10000, 11000);
 84	sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
 85	sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
 86	usleep_range(10000, 11000);
 87
 88	if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) {
 89		sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
 90		sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
 91	}
 92}
 93
 94#ifdef CONFIG_PM_SLEEP
 95static int tmio_mmc_suspend(struct device *dev)
 96{
 97	struct platform_device *pdev = to_platform_device(dev);
 98	const struct mfd_cell *cell = mfd_get_cell(pdev);
 99	int ret;
100
101	ret = pm_runtime_force_suspend(dev);
102
103	/* Tell MFD core it can disable us now.*/
104	if (!ret && cell->disable)
105		cell->disable(pdev);
106
107	return ret;
108}
109
110static int tmio_mmc_resume(struct device *dev)
111{
112	struct platform_device *pdev = to_platform_device(dev);
113	const struct mfd_cell *cell = mfd_get_cell(pdev);
114	int ret = 0;
115
116	/* Tell the MFD core we are ready to be enabled */
117	if (cell->resume)
118		ret = cell->resume(pdev);
119
120	if (!ret)
121		ret = pm_runtime_force_resume(dev);
122
123	return ret;
124}
125#endif
126
127static int tmio_mmc_probe(struct platform_device *pdev)
128{
129	const struct mfd_cell *cell = mfd_get_cell(pdev);
130	struct tmio_mmc_data *pdata;
131	struct tmio_mmc_host *host;
132	struct resource *res;
133	int ret = -EINVAL, irq;
134
135	if (pdev->num_resources != 2)
136		goto out;
137
138	pdata = pdev->dev.platform_data;
139	if (!pdata || !pdata->hclk)
140		goto out;
141
142	irq = platform_get_irq(pdev, 0);
143	if (irq < 0) {
144		ret = irq;
145		goto out;
146	}
147
148	/* Tell the MFD core we are ready to be enabled */
149	if (cell->enable) {
150		ret = cell->enable(pdev);
151		if (ret)
152			goto out;
153	}
154
155	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
156	if (!res) {
157		ret = -EINVAL;
158		goto cell_disable;
159	}
160
161	host = tmio_mmc_host_alloc(pdev, pdata);
162	if (IS_ERR(host)) {
163		ret = PTR_ERR(host);
164		goto cell_disable;
165	}
166
167	/* SD control register space size is 0x200, 0x400 for bus_shift=1 */
168	host->bus_shift = resource_size(res) >> 10;
169	host->set_clock = tmio_mmc_set_clock;
170	host->reset = tmio_mmc_reset;
171
172	host->mmc->f_max = pdata->hclk;
173	host->mmc->f_min = pdata->hclk / 512;
174
175	ret = tmio_mmc_host_probe(host);
176	if (ret)
177		goto host_free;
178
179	ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq,
180			       IRQF_TRIGGER_FALLING,
181			       dev_name(&pdev->dev), host);
182	if (ret)
183		goto host_remove;
184
185	pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
186		(unsigned long)host->ctl, irq);
187
188	return 0;
189
190host_remove:
191	tmio_mmc_host_remove(host);
192host_free:
193	tmio_mmc_host_free(host);
194cell_disable:
195	if (cell->disable)
196		cell->disable(pdev);
197out:
198	return ret;
199}
200
201static int tmio_mmc_remove(struct platform_device *pdev)
202{
203	const struct mfd_cell *cell = mfd_get_cell(pdev);
204	struct tmio_mmc_host *host = platform_get_drvdata(pdev);
205
206	tmio_mmc_host_remove(host);
207	if (cell->disable)
208		cell->disable(pdev);
209
210	return 0;
211}
212
213/* ------------------- device registration ----------------------- */
214
215static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
216	SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
217	SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
218			   tmio_mmc_host_runtime_resume, NULL)
219};
220
221static struct platform_driver tmio_mmc_driver = {
222	.driver = {
223		.name = "tmio-mmc",
224		.pm = &tmio_mmc_dev_pm_ops,
225	},
226	.probe = tmio_mmc_probe,
227	.remove = tmio_mmc_remove,
228};
229
230module_platform_driver(tmio_mmc_driver);
231
232MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
233MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
234MODULE_LICENSE("GPL v2");
235MODULE_ALIAS("platform:tmio-mmc");