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linux-next/drivers/phy/phy-exynos-pcie.c
Jaehoon Chung cf0adb8e28 phy: phy-exynos-pcie: Add support for Exynos PCIe PHY 
Add support for Generic PHY framework about Exynos SoCs.  Current Exynos
PCIe driver doesn't use the PHY framework, which makes it difficult to
upstream the other Exynos variants because of different PHY registers.

Move the codes relevant to PHY from Exnyos PCIe driver to PHY Exynos PCIe
driver.

[bhelgaas: depend on "OF && (ARCH_EXYNOS || COMPILE_TEST)", update
copyright year, both per Vivek]
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Jingoo Han <jingoohan1@gmail.com>
Reviewed-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Reviewed-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2017-02-21 07:48:42 -06:00

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/*
* 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/mfd/syscon.h>
#include <linux/module.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,
},
{},
};
MODULE_DEVICE_TABLE(of, exynos_pcie_phy_match);
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->phy_base))
return PTR_ERR(exynos_phy->phy_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",
}
};
module_platform_driver(exynos_pcie_phy_driver);
MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC PCIe PHY driver");
MODULE_AUTHOR("Jaehoon Chung <jh80.chung@samsung.com>");
MODULE_LICENSE("GPL v2");
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