361 lines
9.8 KiB
C
361 lines
9.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Mediatek MT7621 PCI PHY Driver
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* Author: Sergio Paracuellos <sergio.paracuellos@gmail.com>
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*/
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#include <dt-bindings/phy/phy.h>
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#include <linux/clk.h>
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#include <linux/bitfield.h>
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#include <linux/bitops.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/sys_soc.h>
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#define RG_PE1_PIPE_REG 0x02c
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#define RG_PE1_PIPE_RST BIT(12)
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#define RG_PE1_PIPE_CMD_FRC BIT(4)
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#define RG_P0_TO_P1_WIDTH 0x100
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#define RG_PE1_H_LCDDS_REG 0x49c
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#define RG_PE1_H_LCDDS_PCW GENMASK(30, 0)
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#define RG_PE1_FRC_H_XTAL_REG 0x400
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#define RG_PE1_FRC_H_XTAL_TYPE BIT(8)
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#define RG_PE1_H_XTAL_TYPE GENMASK(10, 9)
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#define RG_PE1_FRC_PHY_REG 0x000
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#define RG_PE1_FRC_PHY_EN BIT(4)
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#define RG_PE1_PHY_EN BIT(5)
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#define RG_PE1_H_PLL_REG 0x490
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#define RG_PE1_H_PLL_BC GENMASK(23, 22)
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#define RG_PE1_H_PLL_BP GENMASK(21, 18)
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#define RG_PE1_H_PLL_IR GENMASK(15, 12)
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#define RG_PE1_H_PLL_IC GENMASK(11, 8)
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#define RG_PE1_H_PLL_PREDIV GENMASK(7, 6)
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#define RG_PE1_PLL_DIVEN GENMASK(3, 1)
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#define RG_PE1_H_PLL_FBKSEL_REG 0x4bc
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#define RG_PE1_H_PLL_FBKSEL GENMASK(5, 4)
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#define RG_PE1_H_LCDDS_SSC_PRD_REG 0x4a4
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#define RG_PE1_H_LCDDS_SSC_PRD GENMASK(15, 0)
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#define RG_PE1_H_LCDDS_SSC_DELTA_REG 0x4a8
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#define RG_PE1_H_LCDDS_SSC_DELTA GENMASK(11, 0)
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#define RG_PE1_H_LCDDS_SSC_DELTA1 GENMASK(27, 16)
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#define RG_PE1_LCDDS_CLK_PH_INV_REG 0x4a0
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#define RG_PE1_LCDDS_CLK_PH_INV BIT(5)
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#define RG_PE1_H_PLL_BR_REG 0x4ac
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#define RG_PE1_H_PLL_BR GENMASK(18, 16)
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#define RG_PE1_MSTCKDIV_REG 0x414
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#define RG_PE1_MSTCKDIV GENMASK(7, 6)
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#define RG_PE1_FRC_MSTCKDIV BIT(5)
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#define MAX_PHYS 2
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/**
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* struct mt7621_pci_phy - Mt7621 Pcie PHY core
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* @dev: pointer to device
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* @regmap: kernel regmap pointer
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* @phy: pointer to the kernel PHY device
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* @sys_clk: pointer to the system XTAL clock
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* @port_base: base register
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* @has_dual_port: if the phy has dual ports.
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* @bypass_pipe_rst: mark if 'mt7621_bypass_pipe_rst'
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* needs to be executed. Depends on chip revision.
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*/
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struct mt7621_pci_phy {
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struct device *dev;
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struct regmap *regmap;
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struct phy *phy;
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struct clk *sys_clk;
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void __iomem *port_base;
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bool has_dual_port;
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bool bypass_pipe_rst;
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};
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static inline void mt7621_phy_rmw(struct mt7621_pci_phy *phy,
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u32 reg, u32 clr, u32 set)
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{
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u32 val;
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/*
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* We cannot use 'regmap_write_bits' here because internally
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* 'set' is masked before is set to the value that will be
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* written to the register. That way results in no reliable
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* pci setup. Avoid to mask 'set' before set value to 'val'
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* completely avoid the problem.
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*/
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regmap_read(phy->regmap, reg, &val);
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val &= ~clr;
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val |= set;
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regmap_write(phy->regmap, reg, val);
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}
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static void mt7621_bypass_pipe_rst(struct mt7621_pci_phy *phy)
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{
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mt7621_phy_rmw(phy, RG_PE1_PIPE_REG, 0, RG_PE1_PIPE_RST);
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mt7621_phy_rmw(phy, RG_PE1_PIPE_REG, 0, RG_PE1_PIPE_CMD_FRC);
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if (phy->has_dual_port) {
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mt7621_phy_rmw(phy, RG_PE1_PIPE_REG + RG_P0_TO_P1_WIDTH,
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0, RG_PE1_PIPE_RST);
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mt7621_phy_rmw(phy, RG_PE1_PIPE_REG + RG_P0_TO_P1_WIDTH,
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0, RG_PE1_PIPE_CMD_FRC);
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}
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}
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static int mt7621_set_phy_for_ssc(struct mt7621_pci_phy *phy)
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{
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struct device *dev = phy->dev;
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unsigned long clk_rate;
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clk_rate = clk_get_rate(phy->sys_clk);
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if (!clk_rate)
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return -EINVAL;
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/* Set PCIe Port PHY to disable SSC */
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/* Debug Xtal Type */
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mt7621_phy_rmw(phy, RG_PE1_FRC_H_XTAL_REG,
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RG_PE1_FRC_H_XTAL_TYPE | RG_PE1_H_XTAL_TYPE,
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RG_PE1_FRC_H_XTAL_TYPE |
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FIELD_PREP(RG_PE1_H_XTAL_TYPE, 0x00));
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/* disable port */
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mt7621_phy_rmw(phy, RG_PE1_FRC_PHY_REG, RG_PE1_PHY_EN,
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RG_PE1_FRC_PHY_EN);
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if (phy->has_dual_port) {
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mt7621_phy_rmw(phy, RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH,
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RG_PE1_PHY_EN, RG_PE1_FRC_PHY_EN);
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}
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if (clk_rate == 40000000) { /* 40MHz Xtal */
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/* Set Pre-divider ratio (for host mode) */
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mt7621_phy_rmw(phy, RG_PE1_H_PLL_REG, RG_PE1_H_PLL_PREDIV,
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FIELD_PREP(RG_PE1_H_PLL_PREDIV, 0x01));
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dev_dbg(dev, "Xtal is 40MHz\n");
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} else if (clk_rate == 25000000) { /* 25MHz Xal */
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mt7621_phy_rmw(phy, RG_PE1_H_PLL_REG, RG_PE1_H_PLL_PREDIV,
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FIELD_PREP(RG_PE1_H_PLL_PREDIV, 0x00));
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/* Select feedback clock */
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mt7621_phy_rmw(phy, RG_PE1_H_PLL_FBKSEL_REG,
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RG_PE1_H_PLL_FBKSEL,
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FIELD_PREP(RG_PE1_H_PLL_FBKSEL, 0x01));
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/* DDS NCPO PCW (for host mode) */
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mt7621_phy_rmw(phy, RG_PE1_H_LCDDS_SSC_PRD_REG,
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RG_PE1_H_LCDDS_SSC_PRD,
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FIELD_PREP(RG_PE1_H_LCDDS_SSC_PRD, 0x00));
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/* DDS SSC dither period control */
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mt7621_phy_rmw(phy, RG_PE1_H_LCDDS_SSC_PRD_REG,
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RG_PE1_H_LCDDS_SSC_PRD,
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FIELD_PREP(RG_PE1_H_LCDDS_SSC_PRD, 0x18d));
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/* DDS SSC dither amplitude control */
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mt7621_phy_rmw(phy, RG_PE1_H_LCDDS_SSC_DELTA_REG,
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RG_PE1_H_LCDDS_SSC_DELTA |
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RG_PE1_H_LCDDS_SSC_DELTA1,
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FIELD_PREP(RG_PE1_H_LCDDS_SSC_DELTA, 0x4a) |
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FIELD_PREP(RG_PE1_H_LCDDS_SSC_DELTA1, 0x4a));
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dev_dbg(dev, "Xtal is 25MHz\n");
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} else { /* 20MHz Xtal */
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mt7621_phy_rmw(phy, RG_PE1_H_PLL_REG, RG_PE1_H_PLL_PREDIV,
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FIELD_PREP(RG_PE1_H_PLL_PREDIV, 0x00));
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dev_dbg(dev, "Xtal is 20MHz\n");
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}
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/* DDS clock inversion */
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mt7621_phy_rmw(phy, RG_PE1_LCDDS_CLK_PH_INV_REG,
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RG_PE1_LCDDS_CLK_PH_INV, RG_PE1_LCDDS_CLK_PH_INV);
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/* Set PLL bits */
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mt7621_phy_rmw(phy, RG_PE1_H_PLL_REG,
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RG_PE1_H_PLL_BC | RG_PE1_H_PLL_BP | RG_PE1_H_PLL_IR |
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RG_PE1_H_PLL_IC | RG_PE1_PLL_DIVEN,
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FIELD_PREP(RG_PE1_H_PLL_BC, 0x02) |
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FIELD_PREP(RG_PE1_H_PLL_BP, 0x06) |
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FIELD_PREP(RG_PE1_H_PLL_IR, 0x02) |
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FIELD_PREP(RG_PE1_H_PLL_IC, 0x01) |
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FIELD_PREP(RG_PE1_PLL_DIVEN, 0x02));
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mt7621_phy_rmw(phy, RG_PE1_H_PLL_BR_REG, RG_PE1_H_PLL_BR,
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FIELD_PREP(RG_PE1_H_PLL_BR, 0x00));
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if (clk_rate == 40000000) { /* 40MHz Xtal */
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/* set force mode enable of da_pe1_mstckdiv */
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mt7621_phy_rmw(phy, RG_PE1_MSTCKDIV_REG,
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RG_PE1_MSTCKDIV | RG_PE1_FRC_MSTCKDIV,
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FIELD_PREP(RG_PE1_MSTCKDIV, 0x01) |
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RG_PE1_FRC_MSTCKDIV);
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}
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return 0;
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}
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static int mt7621_pci_phy_init(struct phy *phy)
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{
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struct mt7621_pci_phy *mphy = phy_get_drvdata(phy);
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if (mphy->bypass_pipe_rst)
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mt7621_bypass_pipe_rst(mphy);
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return mt7621_set_phy_for_ssc(mphy);
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}
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static int mt7621_pci_phy_power_on(struct phy *phy)
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{
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struct mt7621_pci_phy *mphy = phy_get_drvdata(phy);
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/* Enable PHY and disable force mode */
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mt7621_phy_rmw(mphy, RG_PE1_FRC_PHY_REG,
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RG_PE1_FRC_PHY_EN, RG_PE1_PHY_EN);
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if (mphy->has_dual_port) {
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mt7621_phy_rmw(mphy, RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH,
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RG_PE1_FRC_PHY_EN, RG_PE1_PHY_EN);
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}
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return 0;
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}
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static int mt7621_pci_phy_power_off(struct phy *phy)
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{
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struct mt7621_pci_phy *mphy = phy_get_drvdata(phy);
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/* Disable PHY */
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mt7621_phy_rmw(mphy, RG_PE1_FRC_PHY_REG,
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RG_PE1_PHY_EN, RG_PE1_FRC_PHY_EN);
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if (mphy->has_dual_port) {
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mt7621_phy_rmw(mphy, RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH,
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RG_PE1_PHY_EN, RG_PE1_FRC_PHY_EN);
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}
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return 0;
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}
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static int mt7621_pci_phy_exit(struct phy *phy)
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{
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return 0;
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}
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static const struct phy_ops mt7621_pci_phy_ops = {
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.init = mt7621_pci_phy_init,
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.exit = mt7621_pci_phy_exit,
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.power_on = mt7621_pci_phy_power_on,
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.power_off = mt7621_pci_phy_power_off,
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.owner = THIS_MODULE,
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};
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static struct phy *mt7621_pcie_phy_of_xlate(struct device *dev,
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struct of_phandle_args *args)
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{
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struct mt7621_pci_phy *mt7621_phy = dev_get_drvdata(dev);
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if (WARN_ON(args->args[0] >= MAX_PHYS))
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return ERR_PTR(-ENODEV);
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mt7621_phy->has_dual_port = args->args[0];
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dev_dbg(dev, "PHY for 0x%px (dual port = %d)\n",
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mt7621_phy->port_base, mt7621_phy->has_dual_port);
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return mt7621_phy->phy;
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}
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static const struct soc_device_attribute mt7621_pci_quirks_match[] = {
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{ .soc_id = "mt7621", .revision = "E2" },
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{ /* sentinel */ }
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};
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static const struct regmap_config mt7621_pci_phy_regmap_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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.max_register = 0x700,
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};
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static int mt7621_pci_phy_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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const struct soc_device_attribute *attr;
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struct phy_provider *provider;
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struct mt7621_pci_phy *phy;
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phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
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if (!phy)
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return -ENOMEM;
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attr = soc_device_match(mt7621_pci_quirks_match);
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if (attr)
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phy->bypass_pipe_rst = true;
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phy->dev = dev;
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platform_set_drvdata(pdev, phy);
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phy->port_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(phy->port_base)) {
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dev_err(dev, "failed to remap phy regs\n");
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return PTR_ERR(phy->port_base);
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}
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phy->regmap = devm_regmap_init_mmio(phy->dev, phy->port_base,
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&mt7621_pci_phy_regmap_config);
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if (IS_ERR(phy->regmap))
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return PTR_ERR(phy->regmap);
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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");
|