diff options
Diffstat (limited to 'drivers/phy/mediatek/phy-mtk-ufs.c')
| -rw-r--r-- | drivers/phy/mediatek/phy-mtk-ufs.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/drivers/phy/mediatek/phy-mtk-ufs.c b/drivers/phy/mediatek/phy-mtk-ufs.c new file mode 100644 index 000000000..cf94f5c35 --- /dev/null +++ b/drivers/phy/mediatek/phy-mtk-ufs.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 MediaTek Inc. + * Author: Stanley Chu <stanley.chu@mediatek.com> + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> + +/* mphy register and offsets */ +#define MP_GLB_DIG_8C 0x008C +#define FRC_PLL_ISO_EN BIT(8) +#define PLL_ISO_EN BIT(9) +#define FRC_FRC_PWR_ON BIT(10) +#define PLL_PWR_ON BIT(11) + +#define MP_LN_DIG_RX_9C 0xA09C +#define FSM_DIFZ_FRC BIT(18) + +#define MP_LN_DIG_RX_AC 0xA0AC +#define FRC_RX_SQ_EN BIT(0) +#define RX_SQ_EN BIT(1) + +#define MP_LN_RX_44 0xB044 +#define FRC_CDR_PWR_ON BIT(17) +#define CDR_PWR_ON BIT(18) +#define FRC_CDR_ISO_EN BIT(19) +#define CDR_ISO_EN BIT(20) + +struct ufs_mtk_phy { + struct device *dev; + void __iomem *mmio; + struct clk *mp_clk; + struct clk *unipro_clk; +}; + +static inline u32 mphy_readl(struct ufs_mtk_phy *phy, u32 reg) +{ + return readl(phy->mmio + reg); +} + +static inline void mphy_writel(struct ufs_mtk_phy *phy, u32 val, u32 reg) +{ + writel(val, phy->mmio + reg); +} + +static void mphy_set_bit(struct ufs_mtk_phy *phy, u32 reg, u32 bit) +{ + u32 val; + + val = mphy_readl(phy, reg); + val |= bit; + mphy_writel(phy, val, reg); +} + +static void mphy_clr_bit(struct ufs_mtk_phy *phy, u32 reg, u32 bit) +{ + u32 val; + + val = mphy_readl(phy, reg); + val &= ~bit; + mphy_writel(phy, val, reg); +} + +static struct ufs_mtk_phy *get_ufs_mtk_phy(struct phy *generic_phy) +{ + return (struct ufs_mtk_phy *)phy_get_drvdata(generic_phy); +} + +static int ufs_mtk_phy_clk_init(struct ufs_mtk_phy *phy) +{ + struct device *dev = phy->dev; + + phy->unipro_clk = devm_clk_get(dev, "unipro"); + if (IS_ERR(phy->unipro_clk)) { + dev_err(dev, "failed to get clock: unipro"); + return PTR_ERR(phy->unipro_clk); + } + + phy->mp_clk = devm_clk_get(dev, "mp"); + if (IS_ERR(phy->mp_clk)) { + dev_err(dev, "failed to get clock: mp"); + return PTR_ERR(phy->mp_clk); + } + + return 0; +} + +static void ufs_mtk_phy_set_active(struct ufs_mtk_phy *phy) +{ + /* release DA_MP_PLL_PWR_ON */ + mphy_set_bit(phy, MP_GLB_DIG_8C, PLL_PWR_ON); + mphy_clr_bit(phy, MP_GLB_DIG_8C, FRC_FRC_PWR_ON); + + /* release DA_MP_PLL_ISO_EN */ + mphy_clr_bit(phy, MP_GLB_DIG_8C, PLL_ISO_EN); + mphy_clr_bit(phy, MP_GLB_DIG_8C, FRC_PLL_ISO_EN); + + /* release DA_MP_CDR_PWR_ON */ + mphy_set_bit(phy, MP_LN_RX_44, CDR_PWR_ON); + mphy_clr_bit(phy, MP_LN_RX_44, FRC_CDR_PWR_ON); + + /* release DA_MP_CDR_ISO_EN */ + mphy_clr_bit(phy, MP_LN_RX_44, CDR_ISO_EN); + mphy_clr_bit(phy, MP_LN_RX_44, FRC_CDR_ISO_EN); + + /* release DA_MP_RX0_SQ_EN */ + mphy_set_bit(phy, MP_LN_DIG_RX_AC, RX_SQ_EN); + mphy_clr_bit(phy, MP_LN_DIG_RX_AC, FRC_RX_SQ_EN); + + /* delay 1us to wait DIFZ stable */ + udelay(1); + + /* release DIFZ */ + mphy_clr_bit(phy, MP_LN_DIG_RX_9C, FSM_DIFZ_FRC); +} + +static void ufs_mtk_phy_set_deep_hibern(struct ufs_mtk_phy *phy) +{ + /* force DIFZ */ + mphy_set_bit(phy, MP_LN_DIG_RX_9C, FSM_DIFZ_FRC); + + /* force DA_MP_RX0_SQ_EN */ + mphy_set_bit(phy, MP_LN_DIG_RX_AC, FRC_RX_SQ_EN); + mphy_clr_bit(phy, MP_LN_DIG_RX_AC, RX_SQ_EN); + + /* force DA_MP_CDR_ISO_EN */ + mphy_set_bit(phy, MP_LN_RX_44, FRC_CDR_ISO_EN); + mphy_set_bit(phy, MP_LN_RX_44, CDR_ISO_EN); + + /* force DA_MP_CDR_PWR_ON */ + mphy_set_bit(phy, MP_LN_RX_44, FRC_CDR_PWR_ON); + mphy_clr_bit(phy, MP_LN_RX_44, CDR_PWR_ON); + + /* force DA_MP_PLL_ISO_EN */ + mphy_set_bit(phy, MP_GLB_DIG_8C, FRC_PLL_ISO_EN); + mphy_set_bit(phy, MP_GLB_DIG_8C, PLL_ISO_EN); + + /* force DA_MP_PLL_PWR_ON */ + mphy_set_bit(phy, MP_GLB_DIG_8C, FRC_FRC_PWR_ON); + mphy_clr_bit(phy, MP_GLB_DIG_8C, PLL_PWR_ON); +} + +static int ufs_mtk_phy_power_on(struct phy *generic_phy) +{ + struct ufs_mtk_phy *phy = get_ufs_mtk_phy(generic_phy); + int ret; + + ret = clk_prepare_enable(phy->unipro_clk); + if (ret) { + dev_err(phy->dev, "unipro_clk enable failed %d\n", ret); + goto out; + } + + ret = clk_prepare_enable(phy->mp_clk); + if (ret) { + dev_err(phy->dev, "mp_clk enable failed %d\n", ret); + goto out_unprepare_unipro_clk; + } + + ufs_mtk_phy_set_active(phy); + + return 0; + +out_unprepare_unipro_clk: + clk_disable_unprepare(phy->unipro_clk); +out: + return ret; +} + +static int ufs_mtk_phy_power_off(struct phy *generic_phy) +{ + struct ufs_mtk_phy *phy = get_ufs_mtk_phy(generic_phy); + + ufs_mtk_phy_set_deep_hibern(phy); + + clk_disable_unprepare(phy->unipro_clk); + clk_disable_unprepare(phy->mp_clk); + + return 0; +} + +static const struct phy_ops ufs_mtk_phy_ops = { + .power_on = ufs_mtk_phy_power_on, + .power_off = ufs_mtk_phy_power_off, + .owner = THIS_MODULE, +}; + +static int ufs_mtk_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct phy *generic_phy; + struct phy_provider *phy_provider; + struct resource *res; + struct ufs_mtk_phy *phy; + int ret; + + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + phy->mmio = devm_ioremap_resource(dev, res); + if (IS_ERR(phy->mmio)) + return PTR_ERR(phy->mmio); + + phy->dev = dev; + + ret = ufs_mtk_phy_clk_init(phy); + if (ret) + return ret; + + generic_phy = devm_phy_create(dev, NULL, &ufs_mtk_phy_ops); + if (IS_ERR(generic_phy)) + return PTR_ERR(generic_phy); + + phy_set_drvdata(generic_phy, phy); + + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(phy_provider); +} + +static const struct of_device_id ufs_mtk_phy_of_match[] = { + {.compatible = "mediatek,mt8183-ufsphy"}, + {}, +}; +MODULE_DEVICE_TABLE(of, ufs_mtk_phy_of_match); + +static struct platform_driver ufs_mtk_phy_driver = { + .probe = ufs_mtk_phy_probe, + .driver = { + .of_match_table = ufs_mtk_phy_of_match, + .name = "ufs_mtk_phy", + }, +}; +module_platform_driver(ufs_mtk_phy_driver); + +MODULE_DESCRIPTION("Universal Flash Storage (UFS) MediaTek MPHY"); +MODULE_AUTHOR("Stanley Chu <stanley.chu@mediatek.com>"); +MODULE_LICENSE("GPL v2"); |