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/pm_runtime.h>
 19#include <linux/regmap.h>
 20#include <linux/regulator/consumer.h>
 21
 22#include "dw_mmc.h"
 23#include "dw_mmc-pltfm.h"
 24
 25/*
 26 * hi6220 sd only support io voltage 1.8v and 3v
 27 * Also need config AO_SCTRL_SEL18 accordingly
 28 */
 29#define AO_SCTRL_SEL18		BIT(10)
 30#define AO_SCTRL_CTRL3		0x40C
 31
 32struct k3_priv {
 33	struct regmap	*reg;
 34};
 35
 36static unsigned long dw_mci_hi6220_caps[] = {
 37	MMC_CAP_CMD23,
 38	MMC_CAP_CMD23,
 39	0
 40};
 41
 42static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios)
 43{
 44	int ret;
 45
 46	ret = clk_set_rate(host->ciu_clk, ios->clock);
 47	if (ret)
 48		dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
 49
 50	host->bus_hz = clk_get_rate(host->ciu_clk);
 51}
 52
 53static const struct dw_mci_drv_data k3_drv_data = {
 54	.set_ios		= dw_mci_k3_set_ios,
 55};
 56
 57static int dw_mci_hi6220_parse_dt(struct dw_mci *host)
 58{
 59	struct k3_priv *priv;
 60
 61	priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
 62	if (!priv)
 63		return -ENOMEM;
 64
 65	priv->reg = syscon_regmap_lookup_by_phandle(host->dev->of_node,
 66					 "hisilicon,peripheral-syscon");
 67	if (IS_ERR(priv->reg))
 68		priv->reg = NULL;
 69
 70	host->priv = priv;
 71	return 0;
 72}
 73
 74static int dw_mci_hi6220_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
 75{
 76	struct dw_mci_slot *slot = mmc_priv(mmc);
 77	struct k3_priv *priv;
 78	struct dw_mci *host;
 79	int min_uv, max_uv;
 80	int ret;
 81
 82	host = slot->host;
 83	priv = host->priv;
 84
 85	if (!priv || !priv->reg)
 86		return 0;
 87
 88	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
 89		ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
 90					 AO_SCTRL_SEL18, 0);
 91		min_uv = 3000000;
 92		max_uv = 3000000;
 93	} else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
 94		ret = regmap_update_bits(priv->reg, AO_SCTRL_CTRL3,
 95					 AO_SCTRL_SEL18, AO_SCTRL_SEL18);
 96		min_uv = 1800000;
 97		max_uv = 1800000;
 98	} else {
 99		dev_dbg(host->dev, "voltage not supported\n");
100		return -EINVAL;
101	}
102
103	if (ret) {
104		dev_dbg(host->dev, "switch voltage failed\n");
105		return ret;
106	}
107
108	if (IS_ERR_OR_NULL(mmc->supply.vqmmc))
109		return 0;
110
111	ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
112	if (ret) {
113		dev_dbg(host->dev, "Regulator set error %d: %d - %d\n",
114				 ret, min_uv, max_uv);
115		return ret;
116	}
117
118	return 0;
119}
120
121static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios)
122{
123	int ret;
124	unsigned int clock;
125
126	clock = (ios->clock <= 25000000) ? 25000000 : ios->clock;
127
128	ret = clk_set_rate(host->biu_clk, clock);
129	if (ret)
130		dev_warn(host->dev, "failed to set rate %uHz\n", clock);
131
132	host->bus_hz = clk_get_rate(host->biu_clk);
133}
134
135static int dw_mci_hi6220_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
136{
137	return 0;
138}
139
140static const struct dw_mci_drv_data hi6220_data = {
141	.caps			= dw_mci_hi6220_caps,
142	.switch_voltage		= dw_mci_hi6220_switch_voltage,
143	.set_ios		= dw_mci_hi6220_set_ios,
144	.parse_dt		= dw_mci_hi6220_parse_dt,
145	.execute_tuning		= dw_mci_hi6220_execute_tuning,
146};
147
148static const struct of_device_id dw_mci_k3_match[] = {
149	{ .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, },
150	{ .compatible = "hisilicon,hi6220-dw-mshc", .data = &hi6220_data, },
151	{},
152};
153MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
154
155static int dw_mci_k3_probe(struct platform_device *pdev)
156{
157	const struct dw_mci_drv_data *drv_data;
158	const struct of_device_id *match;
159
160	match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
161	drv_data = match->data;
162
163	return dw_mci_pltfm_register(pdev, drv_data);
164}
165
166static const struct dev_pm_ops dw_mci_k3_dev_pm_ops = {
167	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
168				pm_runtime_force_resume)
169	SET_RUNTIME_PM_OPS(dw_mci_runtime_suspend,
170			   dw_mci_runtime_resume,
171			   NULL)
172};
173
174static struct platform_driver dw_mci_k3_pltfm_driver = {
175	.probe		= dw_mci_k3_probe,
176	.remove		= dw_mci_pltfm_remove,
177	.driver		= {
178		.name		= "dwmmc_k3",
179		.of_match_table	= dw_mci_k3_match,
180		.pm		= &dw_mci_k3_dev_pm_ops,
181	},
182};
183
184module_platform_driver(dw_mci_k3_pltfm_driver);
185
186MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension");
187MODULE_LICENSE("GPL v2");
188MODULE_ALIAS("platform:dwmmc_k3");