| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Sergio Paracuellos | 1372 | 99.28% | 4 | 66.67% |
| Wei Yongjun | 6 | 0.43% | 1 | 16.67% |
| John Thomson | 4 | 0.29% | 1 | 16.67% |
| Total | 1382 | 6 |
// 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/clk.h> #include <linux/bitfield.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> #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_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_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_BP GENMASK(21, 18) #define RG_PE1_H_PLL_IR GENMASK(15, 12) #define RG_PE1_H_PLL_IC GENMASK(11, 8) #define RG_PE1_H_PLL_PREDIV GENMASK(7, 6) #define RG_PE1_PLL_DIVEN GENMASK(3, 1) #define RG_PE1_H_PLL_FBKSEL_REG 0x4bc #define RG_PE1_H_PLL_FBKSEL GENMASK(5, 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_DELTA_REG 0x4a8 #define RG_PE1_H_LCDDS_SSC_DELTA GENMASK(11, 0) #define RG_PE1_H_LCDDS_SSC_DELTA1 GENMASK(27, 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_MSTCKDIV_REG 0x414 #define RG_PE1_MSTCKDIV GENMASK(7, 6) #define RG_PE1_FRC_MSTCKDIV BIT(5) #define MAX_PHYS 2 /** * struct mt7621_pci_phy - Mt7621 Pcie PHY core * @dev: pointer to device * @regmap: kernel regmap pointer * @phy: pointer to the kernel PHY device * @sys_clk: pointer to the system XTAL clock * @port_base: base register * @has_dual_port: if the phy has dual ports. * @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 phy *phy; struct clk *sys_clk; void __iomem *port_base; bool has_dual_port; bool bypass_pipe_rst; }; static inline void mt7621_phy_rmw(struct mt7621_pci_phy *phy, u32 reg, u32 clr, u32 set) { u32 val; /* * We cannot use 'regmap_write_bits' here because internally * 'set' is masked before is set to the value that will be * written to the register. That way results in no reliable * pci setup. Avoid to mask 'set' before set value to 'val' * completely avoid the problem. */ regmap_read(phy->regmap, reg, &val); val &= ~clr; val |= set; regmap_write(phy->regmap, reg, val); } static void mt7621_bypass_pipe_rst(struct mt7621_pci_phy *phy) { mt7621_phy_rmw(phy, RG_PE1_PIPE_REG, 0, RG_PE1_PIPE_RST); mt7621_phy_rmw(phy, RG_PE1_PIPE_REG, 0, RG_PE1_PIPE_CMD_FRC); if (phy->has_dual_port) { mt7621_phy_rmw(phy, RG_PE1_PIPE_REG + RG_P0_TO_P1_WIDTH, 0, RG_PE1_PIPE_RST); mt7621_phy_rmw(phy, RG_PE1_PIPE_REG + RG_P0_TO_P1_WIDTH, 0, RG_PE1_PIPE_CMD_FRC); } } static int mt7621_set_phy_for_ssc(struct mt7621_pci_phy *phy) { struct device *dev = phy->dev; unsigned long clk_rate; clk_rate = clk_get_rate(phy->sys_clk); if (!clk_rate) return -EINVAL; /* Set PCIe Port PHY to disable SSC */ /* Debug Xtal Type */ mt7621_phy_rmw(phy, RG_PE1_FRC_H_XTAL_REG, RG_PE1_FRC_H_XTAL_TYPE | RG_PE1_H_XTAL_TYPE, RG_PE1_FRC_H_XTAL_TYPE | FIELD_PREP(RG_PE1_H_XTAL_TYPE, 0x00)); /* disable port */ mt7621_phy_rmw(phy, RG_PE1_FRC_PHY_REG, RG_PE1_PHY_EN, RG_PE1_FRC_PHY_EN); if (phy->has_dual_port) { mt7621_phy_rmw(phy, RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH, RG_PE1_PHY_EN, RG_PE1_FRC_PHY_EN); } if (clk_rate == 40000000) { /* 40MHz Xtal */ /* Set Pre-divider ratio (for host mode) */ mt7621_phy_rmw(phy, RG_PE1_H_PLL_REG, RG_PE1_H_PLL_PREDIV, FIELD_PREP(RG_PE1_H_PLL_PREDIV, 0x01)); dev_dbg(dev, "Xtal is 40MHz\n"); } else if (clk_rate == 25000000) { /* 25MHz Xal */ mt7621_phy_rmw(phy, RG_PE1_H_PLL_REG, RG_PE1_H_PLL_PREDIV, FIELD_PREP(RG_PE1_H_PLL_PREDIV, 0x00)); /* Select feedback clock */ mt7621_phy_rmw(phy, RG_PE1_H_PLL_FBKSEL_REG, RG_PE1_H_PLL_FBKSEL, FIELD_PREP(RG_PE1_H_PLL_FBKSEL, 0x01)); /* DDS NCPO PCW (for host mode) */ mt7621_phy_rmw(phy, RG_PE1_H_LCDDS_SSC_PRD_REG, RG_PE1_H_LCDDS_SSC_PRD, FIELD_PREP(RG_PE1_H_LCDDS_SSC_PRD, 0x00)); /* DDS SSC dither period control */ mt7621_phy_rmw(phy, RG_PE1_H_LCDDS_SSC_PRD_REG, RG_PE1_H_LCDDS_SSC_PRD, FIELD_PREP(RG_PE1_H_LCDDS_SSC_PRD, 0x18d)); /* DDS SSC dither amplitude control */ mt7621_phy_rmw(phy, RG_PE1_H_LCDDS_SSC_DELTA_REG, RG_PE1_H_LCDDS_SSC_DELTA | RG_PE1_H_LCDDS_SSC_DELTA1, FIELD_PREP(RG_PE1_H_LCDDS_SSC_DELTA, 0x4a) | FIELD_PREP(RG_PE1_H_LCDDS_SSC_DELTA1, 0x4a)); dev_dbg(dev, "Xtal is 25MHz\n"); } else { /* 20MHz Xtal */ mt7621_phy_rmw(phy, RG_PE1_H_PLL_REG, RG_PE1_H_PLL_PREDIV, FIELD_PREP(RG_PE1_H_PLL_PREDIV, 0x00)); dev_dbg(dev, "Xtal is 20MHz\n"); } /* DDS clock inversion */ mt7621_phy_rmw(phy, RG_PE1_LCDDS_CLK_PH_INV_REG, RG_PE1_LCDDS_CLK_PH_INV, RG_PE1_LCDDS_CLK_PH_INV); /* Set PLL bits */ mt7621_phy_rmw(phy, RG_PE1_H_PLL_REG, RG_PE1_H_PLL_BC | RG_PE1_H_PLL_BP | RG_PE1_H_PLL_IR | RG_PE1_H_PLL_IC | RG_PE1_PLL_DIVEN, FIELD_PREP(RG_PE1_H_PLL_BC, 0x02) | FIELD_PREP(RG_PE1_H_PLL_BP, 0x06) | FIELD_PREP(RG_PE1_H_PLL_IR, 0x02) | FIELD_PREP(RG_PE1_H_PLL_IC, 0x01) | FIELD_PREP(RG_PE1_PLL_DIVEN, 0x02)); mt7621_phy_rmw(phy, RG_PE1_H_PLL_BR_REG, RG_PE1_H_PLL_BR, FIELD_PREP(RG_PE1_H_PLL_BR, 0x00)); if (clk_rate == 40000000) { /* 40MHz Xtal */ /* set force mode enable of da_pe1_mstckdiv */ mt7621_phy_rmw(phy, RG_PE1_MSTCKDIV_REG, RG_PE1_MSTCKDIV | RG_PE1_FRC_MSTCKDIV, FIELD_PREP(RG_PE1_MSTCKDIV, 0x01) | RG_PE1_FRC_MSTCKDIV); } return 0; } static int mt7621_pci_phy_init(struct phy *phy) { struct mt7621_pci_phy *mphy = phy_get_drvdata(phy); if (mphy->bypass_pipe_rst) mt7621_bypass_pipe_rst(mphy); return mt7621_set_phy_for_ssc(mphy); } static int mt7621_pci_phy_power_on(struct phy *phy) { struct mt7621_pci_phy *mphy = phy_get_drvdata(phy); /* Enable PHY and disable force mode */ mt7621_phy_rmw(mphy, RG_PE1_FRC_PHY_REG, RG_PE1_FRC_PHY_EN, RG_PE1_PHY_EN); if (mphy->has_dual_port) { mt7621_phy_rmw(mphy, RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH, RG_PE1_FRC_PHY_EN, RG_PE1_PHY_EN); } return 0; } static int mt7621_pci_phy_power_off(struct phy *phy) { struct mt7621_pci_phy *mphy = phy_get_drvdata(phy); /* Disable PHY */ mt7621_phy_rmw(mphy, RG_PE1_FRC_PHY_REG, RG_PE1_PHY_EN, RG_PE1_FRC_PHY_EN); if (mphy->has_dual_port) { mt7621_phy_rmw(mphy, RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH, RG_PE1_PHY_EN, RG_PE1_FRC_PHY_EN); } return 0; } static int mt7621_pci_phy_exit(struct phy *phy) { 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 (WARN_ON(args->args[0] >= MAX_PHYS)) return ERR_PTR(-ENODEV); mt7621_phy->has_dual_port = args->args[0]; dev_dbg(dev, "PHY for 0x%px (dual port = %d)\n", mt7621_phy->port_base, mt7621_phy->has_dual_port); return mt7621_phy->phy; } static const struct soc_device_attribute mt7621_pci_quirks_match[] = { { .soc_id = "mt7621", .revision = "E2" }, { /* sentinel */ } }; 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; phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); if (!phy) 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); phy->port_base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(phy->port_base)) { dev_err(dev, "failed to remap phy regs\n"); return PTR_ERR(phy->port_base); } phy->regmap = devm_regmap_init_mmio(phy->dev, phy->port_base, &mt7621_pci_phy_regmap_config); if (IS_ERR(phy->regmap)) return PTR_ERR(phy->regmap); phy->phy = devm_phy_create(dev, dev->of_node, &mt7621_pci_phy_ops); if (IS_ERR(phy->phy)) { dev_err(dev, "failed to create phy\n"); return PTR_ERR(phy->phy); } phy->sys_clk = devm_clk_get(dev, NULL); if (IS_ERR(phy->sys_clk)) { dev_err(dev, "failed to get phy clock\n"); return PTR_ERR(phy->sys_clk); } phy_set_drvdata(phy->phy, phy); 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_phy_ids); static struct platform_driver mt7621_pci_phy_driver = { .probe = mt7621_pci_phy_probe, .driver = { .name = "mt7621-pci-phy", .of_match_table = mt7621_pci_phy_ids, }, }; builtin_platform_driver(mt7621_pci_phy_driver); MODULE_AUTHOR("Sergio Paracuellos <sergio.paracuellos@gmail.com>"); MODULE_DESCRIPTION("MediaTek MT7621 PCIe PHY driver"); MODULE_LICENSE("GPL v2");
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