Hi all, On Thu, Apr 25, 2019 at 5:41 PM Sergio Paracuellos <sergio.paracuellos@xxxxxxxxx> wrote: > > This patch adds a driver for the PCIe PHY of MT7621 SoC. > > Signed-off-by: Sergio Paracuellos <sergio.paracuellos@xxxxxxxxx> > --- > 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@xxxxxxxxx> > + */ > + > +#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@xxxxxxxxx>"); > +MODULE_DESCRIPTION("MediaTek MT7621 PCIe PHY driver"); > +MODULE_LICENSE("GPL v2"); > -- > 2.19.1 >