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SubjectRe: [PATCH v3 2/2] phy: ralink: Add PHY driver for MT7621 PCIe PHY
Hi all,

On Thu, Apr 25, 2019 at 5:41 PM Sergio Paracuellos
<sergio.paracuellos@gmail.com> wrote:
>
> This patch adds a driver for the PCIe PHY of MT7621 SoC.
>
> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
> ---
> drivers/phy/ralink/Kconfig | 8 +
> drivers/phy/ralink/Makefile | 1 +
> drivers/phy/ralink/phy-mt7621-pci.c | 423 ++++++++++++++++++++++++++++
> 3 files changed, 432 insertions(+)
> create mode 100644 drivers/phy/ralink/phy-mt7621-pci.c

Any comments on this?

Thanks in advance for your time.

Best regards,
Sergio Paracuellos
>
> diff --git a/drivers/phy/ralink/Kconfig b/drivers/phy/ralink/Kconfig
> index 14fd219535ef..429187ff02e2 100644
> --- a/drivers/phy/ralink/Kconfig
> +++ b/drivers/phy/ralink/Kconfig
> @@ -1,6 +1,14 @@
> #
> # PHY drivers for Ralink platforms.
> #
> +config PHY_MT7621_PCI
> + tristate "MediaTek MT7621 PCI PHY Driver"
> + depends on (RALINK || COMPILE_TEST) && OF
> + select GENERIC_PHY
> + select REGMAP_MMIO
> + help
> + Say 'Y' here to add support for MediaTek MT7621 PCI PHY driver,
> +
> config PHY_RALINK_USB
> tristate "Ralink USB PHY driver"
> depends on RALINK || COMPILE_TEST
> diff --git a/drivers/phy/ralink/Makefile b/drivers/phy/ralink/Makefile
> index 5c9e326e8757..2052d5649863 100644
> --- a/drivers/phy/ralink/Makefile
> +++ b/drivers/phy/ralink/Makefile
> @@ -1 +1,2 @@
> +obj-$(CONFIG_PHY_MT7621_PCI) += phy-mt7621-pci.o
> obj-$(CONFIG_PHY_RALINK_USB) += phy-ralink-usb.o
> diff --git a/drivers/phy/ralink/phy-mt7621-pci.c b/drivers/phy/ralink/phy-mt7621-pci.c
> new file mode 100644
> index 000000000000..2576f179e30a
> --- /dev/null
> +++ b/drivers/phy/ralink/phy-mt7621-pci.c
> @@ -0,0 +1,423 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Mediatek MT7621 PCI PHY Driver
> + * Author: Sergio Paracuellos <sergio.paracuellos@gmail.com>
> + */
> +
> +#include <dt-bindings/phy/phy.h>
> +#include <linux/bitops.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/sys_soc.h>
> +#include <mt7621.h>
> +#include <ralink_regs.h>
> +
> +#define RALINK_CLKCFG1 0x30
> +
> +#define PCIE_PORT_CLK_EN(x) BIT(24 + (x))
> +
> +#define RG_PE1_PIPE_REG 0x02c
> +#define RG_PE1_PIPE_RST BIT(12)
> +#define RG_PE1_PIPE_CMD_FRC BIT(4)
> +
> +#define RG_P0_TO_P1_WIDTH 0x100
> +#define RG_PE1_H_LCDDS_REG 0x49c
> +#define RG_PE1_H_LCDDS_PCW GENMASK(30, 0)
> +#define RG_PE1_H_LCDDS_PCW_VAL(x) ((0x7fffffff & (x)) << 0)
> +
> +#define RG_PE1_FRC_H_XTAL_REG 0x400
> +#define RG_PE1_FRC_H_XTAL_TYPE BIT(8)
> +#define RG_PE1_H_XTAL_TYPE GENMASK(10, 9)
> +#define RG_PE1_H_XTAL_TYPE_VAL(x) ((0x3 & (x)) << 9)
> +
> +#define RG_PE1_FRC_PHY_REG 0x000
> +#define RG_PE1_FRC_PHY_EN BIT(4)
> +#define RG_PE1_PHY_EN BIT(5)
> +
> +#define RG_PE1_H_PLL_REG 0x490
> +#define RG_PE1_H_PLL_BC GENMASK(23, 22)
> +#define RG_PE1_H_PLL_BC_VAL(x) ((0x3 & (x)) << 22)
> +#define RG_PE1_H_PLL_BP GENMASK(21, 18)
> +#define RG_PE1_H_PLL_BP_VAL(x) ((0xf & (x)) << 18)
> +#define RG_PE1_H_PLL_IR GENMASK(15, 12)
> +#define RG_PE1_H_PLL_IR_VAL(x) ((0xf & (x)) << 12)
> +#define RG_PE1_H_PLL_IC GENMASK(11, 8)
> +#define RG_PE1_H_PLL_IC_VAL(x) ((0xf & (x)) << 8)
> +#define RG_PE1_H_PLL_PREDIV GENMASK(7, 6)
> +#define RG_PE1_H_PLL_PREDIV_VAL(x) ((0x3 & (x)) << 6)
> +#define RG_PE1_PLL_DIVEN GENMASK(3, 1)
> +#define RG_PE1_PLL_DIVEN_VAL(x) ((0x7 & (x)) << 1)
> +
> +#define RG_PE1_H_PLL_FBKSEL_REG 0x4bc
> +#define RG_PE1_H_PLL_FBKSEL GENMASK(5, 4)
> +#define RG_PE1_H_PLL_FBKSEL_VAL(x) ((0x3 & (x)) << 4)
> +
> +#define RG_PE1_H_LCDDS_SSC_PRD_REG 0x4a4
> +#define RG_PE1_H_LCDDS_SSC_PRD GENMASK(15, 0)
> +#define RG_PE1_H_LCDDS_SSC_PRD_VAL(x) ((0xffff & (x)) << 0)
> +
> +#define RG_PE1_H_LCDDS_SSC_DELTA_REG 0x4a8
> +#define RG_PE1_H_LCDDS_SSC_DELTA GENMASK(11, 0)
> +#define RG_PE1_H_LCDDS_SSC_DELTA_VAL(x) ((0xfff & (x)) << 0)
> +#define RG_PE1_H_LCDDS_SSC_DELTA1 GENMASK(27, 16)
> +#define RG_PE1_H_LCDDS_SSC_DELTA1_VAL(x) ((0xff & (x)) << 16)
> +
> +#define RG_PE1_LCDDS_CLK_PH_INV_REG 0x4a0
> +#define RG_PE1_LCDDS_CLK_PH_INV BIT(5)
> +
> +#define RG_PE1_H_PLL_BR_REG 0x4ac
> +#define RG_PE1_H_PLL_BR GENMASK(18, 16)
> +#define RG_PE1_H_PLL_BR_VAL(x) ((0x7 & (x)) << 16)
> +
> +#define RG_PE1_MSTCKDIV_REG 0x414
> +#define RG_PE1_MSTCKDIV GENMASK(7, 6)
> +#define RG_PE1_MSTCKDIV_VAL(x) ((0x3 & (x)) << 6)
> +
> +#define RG_PE1_FRC_MSTCKDIV BIT(5)
> +
> +#define MAX_PHYS 2
> +
> +/**
> + * struct mt7621_pci_phy_instance - Mt7621 Pcie PHY device
> + * @phy: pointer to the kernel PHY device
> + * @port_base: base register
> + * @index: internal ID to identify the Mt7621 PCIe PHY
> + */
> +struct mt7621_pci_phy_instance {
> + struct phy *phy;
> + void __iomem *port_base;
> + u32 index;
> +};
> +
> +/**
> + * struct mt7621_pci_phy - Mt7621 Pcie PHY core
> + * @dev: pointer to device
> + * @regmap: kernel regmap pointer
> + * @phys: pointer to Mt7621 PHY device
> + * @nphys: number of PHY devices for this core
> + * @bypass_pipe_rst: mark if 'mt7621_bypass_pipe_rst'
> + * needs to be executed. Depends on chip revision.
> + */
> +struct mt7621_pci_phy {
> + struct device *dev;
> + struct regmap *regmap;
> + struct mt7621_pci_phy_instance **phys;
> + int nphys;
> + bool bypass_pipe_rst;
> +};
> +
> +static inline u32 phy_read(struct mt7621_pci_phy *phy, u32 reg)
> +{
> + u32 val;
> +
> + regmap_read(phy->regmap, reg, &val);
> +
> + return val;
> +}
> +
> +static inline void phy_write(struct mt7621_pci_phy *phy, u32 val, u32 reg)
> +{
> + regmap_write(phy->regmap, reg, val);
> +}
> +
> +static void mt7621_bypass_pipe_rst(struct mt7621_pci_phy *phy,
> + struct mt7621_pci_phy_instance *instance)
> +{
> + u32 offset = (instance->index != 1) ?
> + RG_PE1_PIPE_REG : RG_PE1_PIPE_REG + RG_P0_TO_P1_WIDTH;
> + u32 reg;
> +
> + reg = phy_read(phy, offset);
> + reg &= ~(RG_PE1_PIPE_RST | RG_PE1_PIPE_CMD_FRC);
> + reg |= (RG_PE1_PIPE_RST | RG_PE1_PIPE_CMD_FRC);
> + phy_write(phy, reg, offset);
> +}
> +
> +static void mt7621_set_phy_for_ssc(struct mt7621_pci_phy *phy,
> + struct mt7621_pci_phy_instance *instance)
> +{
> + struct device *dev = phy->dev;
> + u32 reg = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG0);
> + u32 offset;
> + u32 val;
> +
> + reg = (reg >> 6) & 0x7;
> + /* Set PCIe Port PHY to disable SSC */
> + /* Debug Xtal Type */
> + val = phy_read(phy, RG_PE1_FRC_H_XTAL_REG);
> + val &= ~(RG_PE1_FRC_H_XTAL_TYPE | RG_PE1_H_XTAL_TYPE);
> + val |= RG_PE1_FRC_H_XTAL_TYPE;
> + val |= RG_PE1_H_XTAL_TYPE_VAL(0x00);
> + phy_write(phy, val, RG_PE1_FRC_H_XTAL_REG);
> +
> + /* disable port */
> + offset = (instance->index != 1) ?
> + RG_PE1_FRC_PHY_REG : RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH;
> + val = phy_read(phy, offset);
> + val &= ~(RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN);
> + val |= RG_PE1_FRC_PHY_EN;
> + phy_write(phy, val, offset);
> +
> + /* Set Pre-divider ratio (for host mode) */
> + val = phy_read(phy, RG_PE1_H_PLL_REG);
> + val &= ~(RG_PE1_H_PLL_PREDIV);
> +
> + if (reg <= 5 && reg >= 3) { /* 40MHz Xtal */
> + val |= RG_PE1_H_PLL_PREDIV_VAL(0x01);
> + phy_write(phy, val, RG_PE1_H_PLL_REG);
> + dev_info(dev, "Xtal is 40MHz\n");
> + } else { /* 25MHz | 20MHz Xtal */
> + val |= RG_PE1_H_PLL_PREDIV_VAL(0x00);
> + phy_write(phy, val, RG_PE1_H_PLL_REG);
> + if (reg >= 6) {
> + dev_info(dev, "Xtal is 25MHz\n");
> +
> + /* Select feedback clock */
> + val = phy_read(phy, RG_PE1_H_PLL_FBKSEL_REG);
> + val &= ~(RG_PE1_H_PLL_FBKSEL);
> + val |= RG_PE1_H_PLL_FBKSEL_VAL(0x01);
> + phy_write(phy, val, RG_PE1_H_PLL_FBKSEL_REG);
> +
> + /* DDS NCPO PCW (for host mode) */
> + val = phy_read(phy, RG_PE1_H_LCDDS_SSC_PRD_REG);
> + val &= ~(RG_PE1_H_LCDDS_SSC_PRD);
> + val |= RG_PE1_H_LCDDS_SSC_PRD_VAL(0x18000000);
> + phy_write(phy, val, RG_PE1_H_LCDDS_SSC_PRD_REG);
> +
> + /* DDS SSC dither period control */
> + val = phy_read(phy, RG_PE1_H_LCDDS_SSC_PRD_REG);
> + val &= ~(RG_PE1_H_LCDDS_SSC_PRD);
> + val |= RG_PE1_H_LCDDS_SSC_PRD_VAL(0x18d);
> + phy_write(phy, val, RG_PE1_H_LCDDS_SSC_PRD_REG);
> +
> + /* DDS SSC dither amplitude control */
> + val = phy_read(phy, RG_PE1_H_LCDDS_SSC_DELTA_REG);
> + val &= ~(RG_PE1_H_LCDDS_SSC_DELTA |
> + RG_PE1_H_LCDDS_SSC_DELTA1);
> + val |= RG_PE1_H_LCDDS_SSC_DELTA_VAL(0x4a);
> + val |= RG_PE1_H_LCDDS_SSC_DELTA1_VAL(0x4a);
> + phy_write(phy, val, RG_PE1_H_LCDDS_SSC_DELTA_REG);
> + } else {
> + dev_info(dev, "Xtal is 20MHz\n");
> + }
> + }
> +
> + /* DDS clock inversion */
> + val = phy_read(phy, RG_PE1_LCDDS_CLK_PH_INV_REG);
> + val &= ~(RG_PE1_LCDDS_CLK_PH_INV);
> + val |= RG_PE1_LCDDS_CLK_PH_INV;
> + phy_write(phy, val, RG_PE1_LCDDS_CLK_PH_INV_REG);
> +
> + /* Set PLL bits */
> + val = phy_read(phy, RG_PE1_H_PLL_REG);
> + val &= ~(RG_PE1_H_PLL_BC | RG_PE1_H_PLL_BP | RG_PE1_H_PLL_IR |
> + RG_PE1_H_PLL_IC | RG_PE1_PLL_DIVEN);
> + val |= RG_PE1_H_PLL_BC_VAL(0x02);
> + val |= RG_PE1_H_PLL_BP_VAL(0x06);
> + val |= RG_PE1_H_PLL_IR_VAL(0x02);
> + val |= RG_PE1_H_PLL_IC_VAL(0x01);
> + val |= RG_PE1_PLL_DIVEN_VAL(0x02);
> + phy_write(phy, val, RG_PE1_H_PLL_REG);
> +
> + val = phy_read(phy, RG_PE1_H_PLL_BR_REG);
> + val &= ~(RG_PE1_H_PLL_BR);
> + val |= RG_PE1_H_PLL_BR_VAL(0x00);
> + phy_write(phy, val, RG_PE1_H_PLL_BR_REG);
> +
> + if (reg <= 5 && reg >= 3) { /* 40MHz Xtal */
> + /* set force mode enable of da_pe1_mstckdiv */
> + val = phy_read(phy, RG_PE1_MSTCKDIV_REG);
> + val &= ~(RG_PE1_MSTCKDIV | RG_PE1_FRC_MSTCKDIV);
> + val |= (RG_PE1_MSTCKDIV_VAL(0x01) | RG_PE1_FRC_MSTCKDIV);
> + phy_write(phy, val, RG_PE1_MSTCKDIV_REG);
> + }
> +}
> +
> +static int mt7621_pci_phy_init(struct phy *phy)
> +{
> + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy);
> + struct mt7621_pci_phy *mphy = dev_get_drvdata(phy->dev.parent);
> +
> + if (mphy->bypass_pipe_rst)
> + mt7621_bypass_pipe_rst(mphy, instance);
> +
> + mt7621_set_phy_for_ssc(mphy, instance);
> +
> + return 0;
> +}
> +
> +static int mt7621_pci_phy_power_on(struct phy *phy)
> +{
> + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy);
> + struct mt7621_pci_phy *mphy = dev_get_drvdata(phy->dev.parent);
> + u32 offset = (instance->index != 1) ?
> + RG_PE1_FRC_PHY_REG : RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH;
> + u32 val;
> +
> + /* Enable PHY and disable force mode */
> + val = phy_read(mphy, offset);
> + val &= ~(RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN);
> + val |= (RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN);
> + phy_write(mphy, val, offset);
> +
> + return 0;
> +}
> +
> +static int mt7621_pci_phy_power_off(struct phy *phy)
> +{
> + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy);
> + struct mt7621_pci_phy *mphy = dev_get_drvdata(phy->dev.parent);
> + u32 offset = (instance->index != 1) ?
> + RG_PE1_FRC_PHY_REG : RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH;
> + u32 val;
> +
> + /* Disable PHY */
> + val = phy_read(mphy, offset);
> + val &= ~(RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN);
> + val |= RG_PE1_FRC_PHY_EN;
> + phy_write(mphy, val, offset);
> +
> + return 0;
> +}
> +
> +static int mt7621_pci_phy_exit(struct phy *phy)
> +{
> + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy);
> +
> + rt_sysc_m32(PCIE_PORT_CLK_EN(instance->index), 0, RALINK_CLKCFG1);
> +
> + return 0;
> +}
> +
> +static const struct phy_ops mt7621_pci_phy_ops = {
> + .init = mt7621_pci_phy_init,
> + .exit = mt7621_pci_phy_exit,
> + .power_on = mt7621_pci_phy_power_on,
> + .power_off = mt7621_pci_phy_power_off,
> + .owner = THIS_MODULE,
> +};
> +
> +static struct phy *mt7621_pcie_phy_of_xlate(struct device *dev,
> + struct of_phandle_args *args)
> +{
> + struct mt7621_pci_phy *mt7621_phy = dev_get_drvdata(dev);
> +
> + if (args->args_count == 0)
> + return mt7621_phy->phys[0]->phy;
> +
> + if (WARN_ON(args->args[0] >= MAX_PHYS))
> + return ERR_PTR(-ENODEV);
> +
> + return mt7621_phy->phys[args->args[0]]->phy;
> +}
> +
> +static const struct soc_device_attribute mt7621_pci_quirks_match[] = {
> + { .soc_id = "mt7621", .revision = "E2" }
> +};
> +
> +static const struct regmap_config mt7621_pci_phy_regmap_config = {
> + .reg_bits = 32,
> + .val_bits = 32,
> + .reg_stride = 4,
> + .max_register = 0x700,
> +};
> +
> +static int mt7621_pci_phy_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + const struct soc_device_attribute *attr;
> + struct phy_provider *provider;
> + struct mt7621_pci_phy *phy;
> + struct resource *res;
> + int port;
> + void __iomem *port_base;
> +
> + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> + if (!phy)
> + return -ENOMEM;
> +
> + phy->nphys = MAX_PHYS;
> + phy->phys = devm_kcalloc(dev, phy->nphys,
> + sizeof(*phy->phys), GFP_KERNEL);
> + if (!phy->phys)
> + return -ENOMEM;
> +
> + attr = soc_device_match(mt7621_pci_quirks_match);
> + if (attr)
> + phy->bypass_pipe_rst = true;
> +
> + phy->dev = dev;
> + platform_set_drvdata(pdev, phy);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(dev, "failed to get address resource\n");
> + return -ENXIO;
> + }
> +
> + port_base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(port_base)) {
> + dev_err(dev, "failed to remap phy regs\n");
> + return PTR_ERR(port_base);
> + }
> +
> + phy->regmap = devm_regmap_init_mmio(phy->dev, port_base,
> + &mt7621_pci_phy_regmap_config);
> + if (IS_ERR(phy->regmap))
> + return PTR_ERR(phy->regmap);
> +
> + for (port = 0; port < MAX_PHYS; port++) {
> + struct mt7621_pci_phy_instance *instance;
> + struct phy *pphy;
> +
> + instance = devm_kzalloc(dev, sizeof(*instance), GFP_KERNEL);
> + if (!instance)
> + return -ENOMEM;
> +
> + phy->phys[port] = instance;
> +
> + pphy = devm_phy_create(dev, dev->of_node, &mt7621_pci_phy_ops);
> + if (IS_ERR(phy)) {
> + dev_err(dev, "failed to create phy\n");
> + return PTR_ERR(phy);
> + }
> +
> + instance->port_base = port_base;
> + instance->phy = pphy;
> + instance->index = port;
> + phy_set_drvdata(pphy, instance);
> + }
> +
> + provider = devm_of_phy_provider_register(dev, mt7621_pcie_phy_of_xlate);
> +
> + return PTR_ERR_OR_ZERO(provider);
> +}
> +
> +static const struct of_device_id mt7621_pci_phy_ids[] = {
> + { .compatible = "mediatek,mt7621-pci-phy" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, mt7621_pci_ids);
> +
> +static struct platform_driver mt7621_pci_phy_driver = {
> + .probe = mt7621_pci_phy_probe,
> + .driver = {
> + .name = "mt7621-pci-phy",
> + .of_match_table = of_match_ptr(mt7621_pci_phy_ids),
> + },
> +};
> +
> +static int __init mt7621_pci_phy_drv_init(void)
> +{
> + return platform_driver_register(&mt7621_pci_phy_driver);
> +}
> +
> +module_init(mt7621_pci_phy_drv_init);
> +
> +MODULE_AUTHOR("Sergio Paracuellos <sergio.paracuellos@gmail.com>");
> +MODULE_DESCRIPTION("MediaTek MT7621 PCIe PHY driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.19.1
>

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