123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196 |
- /*
- * Samsung S5P/EXYNOS SoC series MIPI CSIS/DSIM DPHY driver
- *
- * Copyright (C) 2013 Samsung Electronics Co., Ltd.
- * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/err.h>
- #include <linux/io.h>
- #include <linux/kernel.h>
- #include <linux/mfd/syscon/exynos4-pmu.h>
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/of_address.h>
- #include <linux/phy/phy.h>
- #include <linux/platform_device.h>
- #include <linux/regmap.h>
- #include <linux/spinlock.h>
- #include <linux/mfd/syscon.h>
- /* MIPI_PHYn_CONTROL reg. offset (for base address from ioremap): n = 0..1 */
- #define EXYNOS_MIPI_PHY_CONTROL(n) ((n) * 4)
- enum exynos_mipi_phy_id {
- EXYNOS_MIPI_PHY_ID_CSIS0,
- EXYNOS_MIPI_PHY_ID_DSIM0,
- EXYNOS_MIPI_PHY_ID_CSIS1,
- EXYNOS_MIPI_PHY_ID_DSIM1,
- EXYNOS_MIPI_PHYS_NUM
- };
- #define is_mipi_dsim_phy_id(id) \
- ((id) == EXYNOS_MIPI_PHY_ID_DSIM0 || (id) == EXYNOS_MIPI_PHY_ID_DSIM1)
- struct exynos_mipi_video_phy {
- struct video_phy_desc {
- struct phy *phy;
- unsigned int index;
- } phys[EXYNOS_MIPI_PHYS_NUM];
- spinlock_t slock;
- void __iomem *regs;
- struct regmap *regmap;
- };
- static int __set_phy_state(struct exynos_mipi_video_phy *state,
- enum exynos_mipi_phy_id id, unsigned int on)
- {
- const unsigned int offset = EXYNOS4_MIPI_PHY_CONTROL(id / 2);
- void __iomem *addr;
- u32 val, reset;
- if (is_mipi_dsim_phy_id(id))
- reset = EXYNOS4_MIPI_PHY_MRESETN;
- else
- reset = EXYNOS4_MIPI_PHY_SRESETN;
- spin_lock(&state->slock);
- if (!IS_ERR(state->regmap)) {
- regmap_read(state->regmap, offset, &val);
- if (on)
- val |= reset;
- else
- val &= ~reset;
- regmap_write(state->regmap, offset, val);
- if (on)
- val |= EXYNOS4_MIPI_PHY_ENABLE;
- else if (!(val & EXYNOS4_MIPI_PHY_RESET_MASK))
- val &= ~EXYNOS4_MIPI_PHY_ENABLE;
- regmap_write(state->regmap, offset, val);
- } else {
- addr = state->regs + EXYNOS_MIPI_PHY_CONTROL(id / 2);
- val = readl(addr);
- if (on)
- val |= reset;
- else
- val &= ~reset;
- writel(val, addr);
- /* Clear ENABLE bit only if MRESETN, SRESETN bits are not set */
- if (on)
- val |= EXYNOS4_MIPI_PHY_ENABLE;
- else if (!(val & EXYNOS4_MIPI_PHY_RESET_MASK))
- val &= ~EXYNOS4_MIPI_PHY_ENABLE;
- writel(val, addr);
- }
- spin_unlock(&state->slock);
- return 0;
- }
- #define to_mipi_video_phy(desc) \
- container_of((desc), struct exynos_mipi_video_phy, phys[(desc)->index]);
- static int exynos_mipi_video_phy_power_on(struct phy *phy)
- {
- struct video_phy_desc *phy_desc = phy_get_drvdata(phy);
- struct exynos_mipi_video_phy *state = to_mipi_video_phy(phy_desc);
- return __set_phy_state(state, phy_desc->index, 1);
- }
- static int exynos_mipi_video_phy_power_off(struct phy *phy)
- {
- struct video_phy_desc *phy_desc = phy_get_drvdata(phy);
- struct exynos_mipi_video_phy *state = to_mipi_video_phy(phy_desc);
- return __set_phy_state(state, phy_desc->index, 0);
- }
- static struct phy *exynos_mipi_video_phy_xlate(struct device *dev,
- struct of_phandle_args *args)
- {
- struct exynos_mipi_video_phy *state = dev_get_drvdata(dev);
- if (WARN_ON(args->args[0] >= EXYNOS_MIPI_PHYS_NUM))
- return ERR_PTR(-ENODEV);
- return state->phys[args->args[0]].phy;
- }
- static const struct phy_ops exynos_mipi_video_phy_ops = {
- .power_on = exynos_mipi_video_phy_power_on,
- .power_off = exynos_mipi_video_phy_power_off,
- .owner = THIS_MODULE,
- };
- static int exynos_mipi_video_phy_probe(struct platform_device *pdev)
- {
- struct exynos_mipi_video_phy *state;
- struct device *dev = &pdev->dev;
- struct phy_provider *phy_provider;
- unsigned int i;
- state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
- if (!state)
- return -ENOMEM;
- state->regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
- if (IS_ERR(state->regmap)) {
- struct resource *res;
- dev_info(dev, "regmap lookup failed: %ld\n",
- PTR_ERR(state->regmap));
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- state->regs = devm_ioremap_resource(dev, res);
- if (IS_ERR(state->regs))
- return PTR_ERR(state->regs);
- }
- dev_set_drvdata(dev, state);
- spin_lock_init(&state->slock);
- for (i = 0; i < EXYNOS_MIPI_PHYS_NUM; i++) {
- struct phy *phy = devm_phy_create(dev, NULL,
- &exynos_mipi_video_phy_ops);
- if (IS_ERR(phy)) {
- dev_err(dev, "failed to create PHY %d\n", i);
- return PTR_ERR(phy);
- }
- state->phys[i].phy = phy;
- state->phys[i].index = i;
- phy_set_drvdata(phy, &state->phys[i]);
- }
- phy_provider = devm_of_phy_provider_register(dev,
- exynos_mipi_video_phy_xlate);
- return PTR_ERR_OR_ZERO(phy_provider);
- }
- static const struct of_device_id exynos_mipi_video_phy_of_match[] = {
- { .compatible = "samsung,s5pv210-mipi-video-phy" },
- { },
- };
- MODULE_DEVICE_TABLE(of, exynos_mipi_video_phy_of_match);
- static struct platform_driver exynos_mipi_video_phy_driver = {
- .probe = exynos_mipi_video_phy_probe,
- .driver = {
- .of_match_table = exynos_mipi_video_phy_of_match,
- .name = "exynos-mipi-video-phy",
- }
- };
- module_platform_driver(exynos_mipi_video_phy_driver);
- MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC MIPI CSI-2/DSI PHY driver");
- MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
- MODULE_LICENSE("GPL v2");
|