diff options
Diffstat (limited to 'drivers/phy/phy-spear1340-miphy.c')
| -rw-r--r-- | drivers/phy/phy-spear1340-miphy.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/drivers/phy/phy-spear1340-miphy.c b/drivers/phy/phy-spear1340-miphy.c new file mode 100644 index 000000000..1a00c2817 --- /dev/null +++ b/drivers/phy/phy-spear1340-miphy.c @@ -0,0 +1,294 @@ +/* + * ST spear1340-miphy driver + * + * Copyright (C) 2014 ST Microelectronics + * Pratyush Anand <pratyush.anand@st.com> + * Mohit Kumar <mohit.kumar@st.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/bitops.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/phy/phy.h> +#include <linux/regmap.h> + +/* SPEAr1340 Registers */ +/* Power Management Registers */ +#define SPEAR1340_PCM_CFG 0x100 + #define SPEAR1340_PCM_CFG_SATA_POWER_EN BIT(11) +#define SPEAR1340_PCM_WKUP_CFG 0x104 +#define SPEAR1340_SWITCH_CTR 0x108 + +#define SPEAR1340_PERIP1_SW_RST 0x318 + #define SPEAR1340_PERIP1_SW_RSATA BIT(12) +#define SPEAR1340_PERIP2_SW_RST 0x31C +#define SPEAR1340_PERIP3_SW_RST 0x320 + +/* PCIE - SATA configuration registers */ +#define SPEAR1340_PCIE_SATA_CFG 0x424 + /* PCIE CFG MASks */ + #define SPEAR1340_PCIE_CFG_DEVICE_PRESENT BIT(11) + #define SPEAR1340_PCIE_CFG_POWERUP_RESET BIT(10) + #define SPEAR1340_PCIE_CFG_CORE_CLK_EN BIT(9) + #define SPEAR1340_PCIE_CFG_AUX_CLK_EN BIT(8) + #define SPEAR1340_SATA_CFG_TX_CLK_EN BIT(4) + #define SPEAR1340_SATA_CFG_RX_CLK_EN BIT(3) + #define SPEAR1340_SATA_CFG_POWERUP_RESET BIT(2) + #define SPEAR1340_SATA_CFG_PM_CLK_EN BIT(1) + #define SPEAR1340_PCIE_SATA_SEL_PCIE (0) + #define SPEAR1340_PCIE_SATA_SEL_SATA (1) + #define SPEAR1340_PCIE_SATA_CFG_MASK 0xF1F + #define SPEAR1340_PCIE_CFG_VAL (SPEAR1340_PCIE_SATA_SEL_PCIE | \ + SPEAR1340_PCIE_CFG_AUX_CLK_EN | \ + SPEAR1340_PCIE_CFG_CORE_CLK_EN | \ + SPEAR1340_PCIE_CFG_POWERUP_RESET | \ + SPEAR1340_PCIE_CFG_DEVICE_PRESENT) + #define SPEAR1340_SATA_CFG_VAL (SPEAR1340_PCIE_SATA_SEL_SATA | \ + SPEAR1340_SATA_CFG_PM_CLK_EN | \ + SPEAR1340_SATA_CFG_POWERUP_RESET | \ + SPEAR1340_SATA_CFG_RX_CLK_EN | \ + SPEAR1340_SATA_CFG_TX_CLK_EN) + +#define SPEAR1340_PCIE_MIPHY_CFG 0x428 + #define SPEAR1340_MIPHY_OSC_BYPASS_EXT BIT(31) + #define SPEAR1340_MIPHY_CLK_REF_DIV2 BIT(27) + #define SPEAR1340_MIPHY_CLK_REF_DIV4 (2 << 27) + #define SPEAR1340_MIPHY_CLK_REF_DIV8 (3 << 27) + #define SPEAR1340_MIPHY_PLL_RATIO_TOP(x) (x << 0) + #define SPEAR1340_PCIE_MIPHY_CFG_MASK 0xF80000FF + #define SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA \ + (SPEAR1340_MIPHY_OSC_BYPASS_EXT | \ + SPEAR1340_MIPHY_CLK_REF_DIV2 | \ + SPEAR1340_MIPHY_PLL_RATIO_TOP(60)) + #define SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK \ + (SPEAR1340_MIPHY_PLL_RATIO_TOP(120)) + #define SPEAR1340_PCIE_SATA_MIPHY_CFG_PCIE \ + (SPEAR1340_MIPHY_OSC_BYPASS_EXT | \ + SPEAR1340_MIPHY_PLL_RATIO_TOP(25)) + +enum spear1340_miphy_mode { + SATA, + PCIE, +}; + +struct spear1340_miphy_priv { + /* phy mode: 0 for SATA 1 for PCIe */ + enum spear1340_miphy_mode mode; + /* regmap for any soc specific misc registers */ + struct regmap *misc; + /* phy struct pointer */ + struct phy *phy; +}; + +static int spear1340_miphy_sata_init(struct spear1340_miphy_priv *priv) +{ + regmap_update_bits(priv->misc, SPEAR1340_PCIE_SATA_CFG, + SPEAR1340_PCIE_SATA_CFG_MASK, + SPEAR1340_SATA_CFG_VAL); + regmap_update_bits(priv->misc, SPEAR1340_PCIE_MIPHY_CFG, + SPEAR1340_PCIE_MIPHY_CFG_MASK, + SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK); + /* Switch on sata power domain */ + regmap_update_bits(priv->misc, SPEAR1340_PCM_CFG, + SPEAR1340_PCM_CFG_SATA_POWER_EN, + SPEAR1340_PCM_CFG_SATA_POWER_EN); + /* Wait for SATA power domain on */ + msleep(20); + + /* Disable PCIE SATA Controller reset */ + regmap_update_bits(priv->misc, SPEAR1340_PERIP1_SW_RST, + SPEAR1340_PERIP1_SW_RSATA, 0); + /* Wait for SATA reset de-assert completion */ + msleep(20); + + return 0; +} + +static int spear1340_miphy_sata_exit(struct spear1340_miphy_priv *priv) +{ + regmap_update_bits(priv->misc, SPEAR1340_PCIE_SATA_CFG, + SPEAR1340_PCIE_SATA_CFG_MASK, 0); + regmap_update_bits(priv->misc, SPEAR1340_PCIE_MIPHY_CFG, + SPEAR1340_PCIE_MIPHY_CFG_MASK, 0); + + /* Enable PCIE SATA Controller reset */ + regmap_update_bits(priv->misc, SPEAR1340_PERIP1_SW_RST, + SPEAR1340_PERIP1_SW_RSATA, + SPEAR1340_PERIP1_SW_RSATA); + /* Wait for SATA power domain off */ + msleep(20); + /* Switch off sata power domain */ + regmap_update_bits(priv->misc, SPEAR1340_PCM_CFG, + SPEAR1340_PCM_CFG_SATA_POWER_EN, 0); + /* Wait for SATA reset assert completion */ + msleep(20); + + return 0; +} + +static int spear1340_miphy_pcie_init(struct spear1340_miphy_priv *priv) +{ + regmap_update_bits(priv->misc, SPEAR1340_PCIE_MIPHY_CFG, + SPEAR1340_PCIE_MIPHY_CFG_MASK, + SPEAR1340_PCIE_SATA_MIPHY_CFG_PCIE); + regmap_update_bits(priv->misc, SPEAR1340_PCIE_SATA_CFG, + SPEAR1340_PCIE_SATA_CFG_MASK, + SPEAR1340_PCIE_CFG_VAL); + + return 0; +} + +static int spear1340_miphy_pcie_exit(struct spear1340_miphy_priv *priv) +{ + regmap_update_bits(priv->misc, SPEAR1340_PCIE_MIPHY_CFG, + SPEAR1340_PCIE_MIPHY_CFG_MASK, 0); + regmap_update_bits(priv->misc, SPEAR1340_PCIE_SATA_CFG, + SPEAR1340_PCIE_SATA_CFG_MASK, 0); + + return 0; +} + +static int spear1340_miphy_init(struct phy *phy) +{ + struct spear1340_miphy_priv *priv = phy_get_drvdata(phy); + int ret = 0; + + if (priv->mode == SATA) + ret = spear1340_miphy_sata_init(priv); + else if (priv->mode == PCIE) + ret = spear1340_miphy_pcie_init(priv); + + return ret; +} + +static int spear1340_miphy_exit(struct phy *phy) +{ + struct spear1340_miphy_priv *priv = phy_get_drvdata(phy); + int ret = 0; + + if (priv->mode == SATA) + ret = spear1340_miphy_sata_exit(priv); + else if (priv->mode == PCIE) + ret = spear1340_miphy_pcie_exit(priv); + + return ret; +} + +static const struct of_device_id spear1340_miphy_of_match[] = { + { .compatible = "st,spear1340-miphy" }, + { }, +}; +MODULE_DEVICE_TABLE(of, spear1340_miphy_of_match); + +static struct phy_ops spear1340_miphy_ops = { + .init = spear1340_miphy_init, + .exit = spear1340_miphy_exit, + .owner = THIS_MODULE, +}; + +#ifdef CONFIG_PM_SLEEP +static int spear1340_miphy_suspend(struct device *dev) +{ + struct spear1340_miphy_priv *priv = dev_get_drvdata(dev); + int ret = 0; + + if (priv->mode == SATA) + ret = spear1340_miphy_sata_exit(priv); + + return ret; +} + +static int spear1340_miphy_resume(struct device *dev) +{ + struct spear1340_miphy_priv *priv = dev_get_drvdata(dev); + int ret = 0; + + if (priv->mode == SATA) + ret = spear1340_miphy_sata_init(priv); + + return ret; +} +#endif + +static SIMPLE_DEV_PM_OPS(spear1340_miphy_pm_ops, spear1340_miphy_suspend, + spear1340_miphy_resume); + +static struct phy *spear1340_miphy_xlate(struct device *dev, + struct of_phandle_args *args) +{ + struct spear1340_miphy_priv *priv = dev_get_drvdata(dev); + + if (args->args_count < 1) { + dev_err(dev, "DT did not pass correct no of args\n"); + return ERR_PTR(-ENODEV); + } + + priv->mode = args->args[0]; + + if (priv->mode != SATA && priv->mode != PCIE) { + dev_err(dev, "DT did not pass correct phy mode\n"); + return ERR_PTR(-ENODEV); + } + + return priv->phy; +} + +static int spear1340_miphy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct spear1340_miphy_priv *priv; + struct phy_provider *phy_provider; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->misc = + syscon_regmap_lookup_by_phandle(dev->of_node, "misc"); + if (IS_ERR(priv->misc)) { + dev_err(dev, "failed to find misc regmap\n"); + return PTR_ERR(priv->misc); + } + + priv->phy = devm_phy_create(dev, NULL, &spear1340_miphy_ops); + if (IS_ERR(priv->phy)) { + dev_err(dev, "failed to create SATA PCIe PHY\n"); + return PTR_ERR(priv->phy); + } + + dev_set_drvdata(dev, priv); + phy_set_drvdata(priv->phy, priv); + + phy_provider = + devm_of_phy_provider_register(dev, spear1340_miphy_xlate); + if (IS_ERR(phy_provider)) { + dev_err(dev, "failed to register phy provider\n"); + return PTR_ERR(phy_provider); + } + + return 0; +} + +static struct platform_driver spear1340_miphy_driver = { + .probe = spear1340_miphy_probe, + .driver = { + .name = "spear1340-miphy", + .pm = &spear1340_miphy_pm_ops, + .of_match_table = of_match_ptr(spear1340_miphy_of_match), + }, +}; + +module_platform_driver(spear1340_miphy_driver); + +MODULE_DESCRIPTION("ST SPEAR1340-MIPHY driver"); +MODULE_AUTHOR("Pratyush Anand <pratyush.anand@st.com>"); +MODULE_LICENSE("GPL v2"); |