1/*
  2 * Copyright (c) 2013 Linaro Ltd.
  3 * Copyright (c) 2013 Hisilicon Limited.
  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 as published by
  7 * the Free Software Foundation; either version 2 of the License, or
  8 * (at your option) any later version.
  9 */
 10
 11#include <linux/clk.h>
 12#include <linux/mfd/syscon.h>
 13#include <linux/mmc/host.h>
 14#include <linux/mmc/dw_mmc.h>
 15#include <linux/module.h>
 16#include <linux/of_address.h>
 17#include <linux/platform_device.h>
 18#include <linux/regmap.h>
 19#include <linux/regulator/consumer.h>
 20
 21#include "dw_mmc.h"
 22#include "dw_mmc-pltfm.h"
 23
 24/*
 25 * hi6220 sd only support io voltage 1.8v and 3v
 26 * Also need config AO_SCTRL_SEL18 accordingly
 27 */
 28#define AO_SCTRL_SEL18		BIT(10)
 29#define AO_SCTRL_CTRL3		0x40C
 30
 31struct k3_priv {
 32	struct regmap	*reg;
 33};
 34
 35static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios)
 36{
 37	int ret;
 38
 39	ret = clk_set_rate(host->ciu_clk, ios->clock);
 40	if (ret)
 41		dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
 42
 43	host->bus_hz = clk_get_rate(host->ciu_clk);
 44}
 45
 46static const struct dw_mci_drv_data k3_drv_data = {
 47	.set_ios		= dw_mci_k3_set_ios,
 48};
 49
 50static int dw_mci_hi6220_parse_dt(struct dw_mci *host)
 51{
 52	struct k3_priv *priv;
 53
 54	priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
 55	if (!priv)
 56		return -ENOMEM;
 57
 58	priv->reg = syscon_regmap_lookup_by_phandle(host->dev->of_node,
 59					 "hisilicon,peripheral-syscon");
 60	if (IS_ERR(priv->reg))
 61		priv->reg = NULL;
 62
 63	host->priv = priv;
 64	return 0;
 65}
 66
 67static int dw_mci_hi6220_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
 68{
 69	struct dw_mci_slot *slot = mmc_priv(mmc);
 70	struct k3_priv *priv;
 71	struct dw_mci *host;
 72	int min_uv, max_uv;
 73	int ret;
 74
 75	host = slot->host;
 76	priv = host->priv;
 77
 78	if (!priv || !priv->reg)
 79		return 0;
 80
 81	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
 82		ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
 83					 AO_SCTRL_SEL18, 0);
 84		min_uv = 3000000;
 85		max_uv = 3000000;
 86	} else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
 87		ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
 88					 AO_SCTRL_SEL18, AO_SCTRL_SEL18);
 89		min_uv = 1800000;
 90		max_uv = 1800000;
 91	} else {
 92		dev_dbg(host->dev, "voltage not supported\n");
 93		return -EINVAL;
 94	}
 95
 96	if (ret) {
 97		dev_dbg(host->dev, "switch voltage failed\n");
 98		return ret;
 99	}
100
101	if (IS_ERR_OR_NULL(mmc->supply.vqmmc))
102		return 0;
103
104	ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
105	if (ret) {
106		dev_dbg(host->dev, "Regulator set error %d: %d - %d\n",
107				 ret, min_uv, max_uv);
108		return ret;
109	}
110
111	return 0;
112}
113
114static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios)
115{
116	int ret;
117	unsigned int clock;
118
119	clock = (ios->clock <= 25000000) ? 25000000 : ios->clock;
120
121	ret = clk_set_rate(host->biu_clk, clock);
122	if (ret)
123		dev_warn(host->dev, "failed to set rate %uHz\n", clock);
124
125	host->bus_hz = clk_get_rate(host->biu_clk);
126}
127
128static const struct dw_mci_drv_data hi6220_data = {
129	.switch_voltage		= dw_mci_hi6220_switch_voltage,
130	.set_ios		= dw_mci_hi6220_set_ios,
131	.parse_dt		= dw_mci_hi6220_parse_dt,
132};
133
134static const struct of_device_id dw_mci_k3_match[] = {
135	{ .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, },
136	{ .compatible = "hisilicon,hi6220-dw-mshc", .data = &hi6220_data, },
137	{},
138};
139MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
140
141static int dw_mci_k3_probe(struct platform_device *pdev)
142{
143	const struct dw_mci_drv_data *drv_data;
144	const struct of_device_id *match;
145
146	match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
147	drv_data = match->data;
148
149	return dw_mci_pltfm_register(pdev, drv_data);
150}
151
152#ifdef CONFIG_PM_SLEEP
153static int dw_mci_k3_suspend(struct device *dev)
154{
155	struct dw_mci *host = dev_get_drvdata(dev);
156	int ret;
157
158	ret = dw_mci_suspend(host);
159	if (!ret)
160		clk_disable_unprepare(host->ciu_clk);
161
162	return ret;
163}
164
165static int dw_mci_k3_resume(struct device *dev)
166{
167	struct dw_mci *host = dev_get_drvdata(dev);
168	int ret;
169
170	ret = clk_prepare_enable(host->ciu_clk);
171	if (ret) {
172		dev_err(host->dev, "failed to enable ciu clock\n");
173		return ret;
174	}
175
176	return dw_mci_resume(host);
177}
178#endif /* CONFIG_PM_SLEEP */
179
180static SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume);
181
182static struct platform_driver dw_mci_k3_pltfm_driver = {
183	.probe		= dw_mci_k3_probe,
184	.remove		= dw_mci_pltfm_remove,
185	.driver		= {
186		.name		= "dwmmc_k3",
187		.of_match_table	= dw_mci_k3_match,
188		.pm		= &dw_mci_k3_pmops,
189	},
190};
191
192module_platform_driver(dw_mci_k3_pltfm_driver);
193
194MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension");
195MODULE_LICENSE("GPL v2");
196MODULE_ALIAS("platform:dwmmc_k3");