| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Jaehoon Chung | 1319 | 99.77% | 2 | 66.67% |
| Paul Gortmaker | 3 | 0.23% | 1 | 33.33% |
| Total | 1322 | 3 |
/* * Samsung EXYNOS SoC series PCIe PHY driver * * Phy provider for PCIe controller on Exynos SoC series * * Copyright (C) 2017 Samsung Electronics Co., Ltd. * Jaehoon Chung <jh80.chung@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/delay.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/init.h> #include <linux/mfd/syscon.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/phy/phy.h> #include <linux/regmap.h> /* PCIe Purple registers */ #define PCIE_PHY_GLOBAL_RESET 0x000 #define PCIE_PHY_COMMON_RESET 0x004 #define PCIE_PHY_CMN_REG 0x008 #define PCIE_PHY_MAC_RESET 0x00c #define PCIE_PHY_PLL_LOCKED 0x010 #define PCIE_PHY_TRSVREG_RESET 0x020 #define PCIE_PHY_TRSV_RESET 0x024 /* PCIe PHY registers */ #define PCIE_PHY_IMPEDANCE 0x004 #define PCIE_PHY_PLL_DIV_0 0x008 #define PCIE_PHY_PLL_BIAS 0x00c #define PCIE_PHY_DCC_FEEDBACK 0x014 #define PCIE_PHY_PLL_DIV_1 0x05c #define PCIE_PHY_COMMON_POWER 0x064 #define PCIE_PHY_COMMON_PD_CMN BIT(3) #define PCIE_PHY_TRSV0_EMP_LVL 0x084 #define PCIE_PHY_TRSV0_DRV_LVL 0x088 #define PCIE_PHY_TRSV0_RXCDR 0x0ac #define PCIE_PHY_TRSV0_POWER 0x0c4 #define PCIE_PHY_TRSV0_PD_TSV BIT(7) #define PCIE_PHY_TRSV0_LVCC 0x0dc #define PCIE_PHY_TRSV1_EMP_LVL 0x144 #define PCIE_PHY_TRSV1_RXCDR 0x16c #define PCIE_PHY_TRSV1_POWER 0x184 #define PCIE_PHY_TRSV1_PD_TSV BIT(7) #define PCIE_PHY_TRSV1_LVCC 0x19c #define PCIE_PHY_TRSV2_EMP_LVL 0x204 #define PCIE_PHY_TRSV2_RXCDR 0x22c #define PCIE_PHY_TRSV2_POWER 0x244 #define PCIE_PHY_TRSV2_PD_TSV BIT(7) #define PCIE_PHY_TRSV2_LVCC 0x25c #define PCIE_PHY_TRSV3_EMP_LVL 0x2c4 #define PCIE_PHY_TRSV3_RXCDR 0x2ec #define PCIE_PHY_TRSV3_POWER 0x304 #define PCIE_PHY_TRSV3_PD_TSV BIT(7) #define PCIE_PHY_TRSV3_LVCC 0x31c struct exynos_pcie_phy_data { const struct phy_ops *ops; }; /* For Exynos pcie phy */ struct exynos_pcie_phy { const struct exynos_pcie_phy_data *drv_data; void __iomem *phy_base; void __iomem *blk_base; /* For exynos5440 */ }; static void exynos_pcie_phy_writel(void __iomem *base, u32 val, u32 offset) { writel(val, base + offset); } static u32 exynos_pcie_phy_readl(void __iomem *base, u32 offset) { return readl(base + offset); } /* For Exynos5440 specific functions */ static int exynos5440_pcie_phy_init(struct phy *phy) { struct exynos_pcie_phy *ep = phy_get_drvdata(phy); /* DCC feedback control off */ exynos_pcie_phy_writel(ep->phy_base, 0x29, PCIE_PHY_DCC_FEEDBACK); /* set TX/RX impedance */ exynos_pcie_phy_writel(ep->phy_base, 0xd5, PCIE_PHY_IMPEDANCE); /* set 50Mhz PHY clock */ exynos_pcie_phy_writel(ep->phy_base, 0x14, PCIE_PHY_PLL_DIV_0); exynos_pcie_phy_writel(ep->phy_base, 0x12, PCIE_PHY_PLL_DIV_1); /* set TX Differential output for lane 0 */ exynos_pcie_phy_writel(ep->phy_base, 0x7f, PCIE_PHY_TRSV0_DRV_LVL); /* set TX Pre-emphasis Level Control for lane 0 to minimum */ exynos_pcie_phy_writel(ep->phy_base, 0x0, PCIE_PHY_TRSV0_EMP_LVL); /* set RX clock and data recovery bandwidth */ exynos_pcie_phy_writel(ep->phy_base, 0xe7, PCIE_PHY_PLL_BIAS); exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV0_RXCDR); exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV1_RXCDR); exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV2_RXCDR); exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV3_RXCDR); /* change TX Pre-emphasis Level Control for lanes */ exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV0_EMP_LVL); exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV1_EMP_LVL); exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV2_EMP_LVL); exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV3_EMP_LVL); /* set LVCC */ exynos_pcie_phy_writel(ep->phy_base, 0x20, PCIE_PHY_TRSV0_LVCC); exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV1_LVCC); exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV2_LVCC); exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV3_LVCC); /* pulse for common reset */ exynos_pcie_phy_writel(ep->blk_base, 1, PCIE_PHY_COMMON_RESET); udelay(500); exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_COMMON_RESET); return 0; } static int exynos5440_pcie_phy_power_on(struct phy *phy) { struct exynos_pcie_phy *ep = phy_get_drvdata(phy); u32 val; exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_COMMON_RESET); exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_CMN_REG); exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_TRSVREG_RESET); exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_TRSV_RESET); val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_COMMON_POWER); val &= ~PCIE_PHY_COMMON_PD_CMN; exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_COMMON_POWER); val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV0_POWER); val &= ~PCIE_PHY_TRSV0_PD_TSV; exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV0_POWER); val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV1_POWER); val &= ~PCIE_PHY_TRSV1_PD_TSV; exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV1_POWER); val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV2_POWER); val &= ~PCIE_PHY_TRSV2_PD_TSV; exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV2_POWER); val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV3_POWER); val &= ~PCIE_PHY_TRSV3_PD_TSV; exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV3_POWER); return 0; } static int exynos5440_pcie_phy_power_off(struct phy *phy) { struct exynos_pcie_phy *ep = phy_get_drvdata(phy); u32 val; if (readl_poll_timeout(ep->phy_base + PCIE_PHY_PLL_LOCKED, val, (val != 0), 1, 500)) { dev_err(&phy->dev, "PLL Locked: 0x%x\n", val); return -ETIMEDOUT; } val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_COMMON_POWER); val |= PCIE_PHY_COMMON_PD_CMN; exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_COMMON_POWER); val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV0_POWER); val |= PCIE_PHY_TRSV0_PD_TSV; exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV0_POWER); val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV1_POWER); val |= PCIE_PHY_TRSV1_PD_TSV; exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV1_POWER); val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV2_POWER); val |= PCIE_PHY_TRSV2_PD_TSV; exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV2_POWER); val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV3_POWER); val |= PCIE_PHY_TRSV3_PD_TSV; exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV3_POWER); return 0; } static int exynos5440_pcie_phy_reset(struct phy *phy) { struct exynos_pcie_phy *ep = phy_get_drvdata(phy); exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_MAC_RESET); exynos_pcie_phy_writel(ep->blk_base, 1, PCIE_PHY_GLOBAL_RESET); exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_GLOBAL_RESET); return 0; } static const struct phy_ops exynos5440_phy_ops = { .init = exynos5440_pcie_phy_init, .power_on = exynos5440_pcie_phy_power_on, .power_off = exynos5440_pcie_phy_power_off, .reset = exynos5440_pcie_phy_reset, .owner = THIS_MODULE, }; static const struct exynos_pcie_phy_data exynos5440_pcie_phy_data = { .ops = &exynos5440_phy_ops, }; static const struct of_device_id exynos_pcie_phy_match[] = { { .compatible = "samsung,exynos5440-pcie-phy", .data = &exynos5440_pcie_phy_data, }, {}, }; static int exynos_pcie_phy_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct exynos_pcie_phy *exynos_phy; struct phy *generic_phy; struct phy_provider *phy_provider; struct resource *res; const struct exynos_pcie_phy_data *drv_data; drv_data = of_device_get_match_data(dev); if (!drv_data) return -ENODEV; exynos_phy = devm_kzalloc(dev, sizeof(*exynos_phy), GFP_KERNEL); if (!exynos_phy) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); exynos_phy->phy_base = devm_ioremap_resource(dev, res); if (IS_ERR(exynos_phy->phy_base)) return PTR_ERR(exynos_phy->phy_base); res = platform_get_resource(pdev, IORESOURCE_MEM, 1); exynos_phy->blk_base = devm_ioremap_resource(dev, res); if (IS_ERR(exynos_phy->blk_base)) return PTR_ERR(exynos_phy->blk_base); exynos_phy->drv_data = drv_data; generic_phy = devm_phy_create(dev, dev->of_node, drv_data->ops); if (IS_ERR(generic_phy)) { dev_err(dev, "failed to create PHY\n"); return PTR_ERR(generic_phy); } phy_set_drvdata(generic_phy, exynos_phy); phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); return PTR_ERR_OR_ZERO(phy_provider); } static struct platform_driver exynos_pcie_phy_driver = { .probe = exynos_pcie_phy_probe, .driver = { .of_match_table = exynos_pcie_phy_match, .name = "exynos_pcie_phy", } }; builtin_platform_driver(exynos_pcie_phy_driver);
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