[PATCH v2 2/3] phy: starfive: Add mipi dphy rx support
Vinod Koul
vkoul at kernel.org
Fri Mar 31 06:52:32 PDT 2023
On 21-03-23, 14:08, Changhuang Liang wrote:
>
>
> On 2023/3/20 20:37, Vinod Koul wrote:
> > On 22-02-23, 17:59, Changhuang Liang wrote:
> >> [...]
> >> +++ b/drivers/phy/starfive/phy-starfive-dphy-rx.c
> >> @@ -0,0 +1,362 @@
> >> +// SPDX-License-Identifier: GPL-2.0+
> >> +/*
> >> + * DPHY driver for the StarFive JH7110 SoC
> >> + *
> >> + * Copyright (C) 2023 StarFive Technology Co., Ltd.
> >> + */
> >> +
> >> +#include <linux/bitfield.h>
> >> +#include <linux/bitops.h>
> >> +#include <linux/clk.h>
> >> +#include <linux/io.h>
> >> +#include <linux/mfd/syscon.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/reset.h>
> >> +
> >> +#define STF_DPHY_APBCFGSAIF__SYSCFG(x) (x)
> >
> > What is the purpose of this? also whats with __ ?
> >
>
> In starfive jh7110 SoC, Dphy rx module register's name is called such as
> STF_DPHY_APBCFGSAIF__SYSCFG_4, STF_DPHY_APBCFGSAIF__SYSCFG_8, STF_DPHY_APBCFGSAIF__SYSCFG_12...
> so I merge them to use a marco STF_DPHY_APBCFGSAIF__SYSCFG(x).
>
> Should I use one "_" is enoughed?
Yes, it should be enough
>
> >> +
> >> +#define STF_DPHY_DA_CDPHY_R100_CTRL0_2D1C_EFUSE_EN BIT(6)
> >> +#define STF_DPHY_DA_CDPHY_R100_CTRL0_2D1C_EFUSE_IN GENMASK(12, 7)
> >> +#define STF_DPHY_DA_CDPHY_R100_CTRL1_2D1C_EFUSE_EN BIT(19)
> >> +#define STF_DPHY_DA_CDPHY_R100_CTRL1_2D1C_EFUSE_IN GENMASK(25, 20)
> >> +
> >> +#define STF_DPHY_DATA_BUS16_8 BIT(8)
> >> +#define STF_DPHY_DEBUG_MODE_SEL GENMASK(15, 9)
> >> +
> >> +#define STF_DPHY_ENABLE_CLK BIT(6)
> >> +#define STF_DPHY_ENABLE_CLK1 BIT(7)
> >> +#define STF_DPHY_ENABLE_LAN0 BIT(8)
> >> +#define STF_DPHY_ENABLE_LAN1 BIT(9)
> >> +#define STF_DPHY_ENABLE_LAN2 BIT(10)
> >> +#define STF_DPHY_ENABLE_LAN3 BIT(11)
> >> +#define STF_DPHY_GPI_EN GENMASK(17, 12)
> >> +#define STF_DPHY_HS_FREQ_CHANGE_CLK BIT(18)
> >> +#define STF_DPHY_HS_FREQ_CHANGE_CLK1 BIT(19)
> >> +#define STF_DPHY_LANE_SWAP_CLK GENMASK(22, 20)
> >> +#define STF_DPHY_LANE_SWAP_CLK1 GENMASK(25, 23)
> >> +#define STF_DPHY_LANE_SWAP_LAN0 GENMASK(28, 26)
> >> +#define STF_DPHY_LANE_SWAP_LAN1 GENMASK(31, 29)
> >> +
> >> +#define STF_DPHY_LANE_SWAP_LAN2 GENMASK(2, 0)
> >> +#define STF_DPHY_LANE_SWAP_LAN3 GENMASK(5, 3)
> >> +#define STF_DPHY_MP_TEST_EN BIT(6)
> >> +#define STF_DPHY_MP_TEST_MODE_SEL GENMASK(11, 7)
> >> +#define STF_DPHY_PLL_CLK_SEL GENMASK(21, 12)
> >> +#define STF_DPHY_PRECOUNTER_IN_CLK GENMASK(29, 22)
> >> +
> >> +#define STF_DPHY_PRECOUNTER_IN_CLK1 GENMASK(7, 0)
> >> +#define STF_DPHY_PRECOUNTER_IN_LAN0 GENMASK(15, 8)
> >> +#define STF_DPHY_PRECOUNTER_IN_LAN1 GENMASK(23, 16)
> >> +#define STF_DPHY_PRECOUNTER_IN_LAN2 GENMASK(31, 24)
> >> +
> >> +#define STF_DPHY_PRECOUNTER_IN_LAN3 GENMASK(7, 0)
> >> +#define STF_DPHY_RX_1C2C_SEL BIT(8)
> >> +
> >> +struct regval_t {
> >
> > regval should be okay, no?
> >
>
> OK, will change to regval
>
> >> + u32 addr;
> >> + u32 val;
> >> +};
> >> +
> >> +struct stf_dphy {
> >> + struct device *dev;
> >> + void __iomem *regs;
> >> + struct clk *cfg_clk;
> >> + struct clk *ref_clk;
> >> + struct clk *tx_clk;
> >> + struct reset_control *rstc;
> >> + struct regulator *mipi_0p9;
> >> + struct phy *phy;
> >> + struct regmap *stf_aon_syscon;
> >> + unsigned int aon_gp_reg;
> >> +};
> >> +
> >> +struct stf_dphy_info {
> >> + bool external_support;
> >> + int (*external_get)(struct stf_dphy *dphy);
> >> + void (*external_init)(struct stf_dphy *dphy);
> >> + void (*external_exit)(struct stf_dphy *dphy);
> >> +};
> >> +
> >> +static const struct stf_dphy_info *stf_dphy_info;
> >> +
> >> +static const struct regval_t stf_dphy_init_list[] = {
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(4), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(8), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(12), 0x0000fff0 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(16), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(20), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(24), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(28), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(32), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(36), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(40), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(40), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(48), 0x24000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(52), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(56), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(60), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(64), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(68), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(72), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(76), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(80), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(84), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(88), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(92), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(96), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(100), 0x02000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(104), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(108), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(112), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(116), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(120), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(124), 0x0000000c },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(128), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(132), 0xcc500000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(136), 0x000000cc },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(140), 0x00000000 },
> >> + { STF_DPHY_APBCFGSAIF__SYSCFG(144), 0x00000000 },
> >> +};
> >> +
> >> +static int stf_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
> >> +{
> >> + struct stf_dphy *dphy = phy_get_drvdata(phy);
> >> + int map[6] = {4, 0, 1, 2, 3, 5};
> >
> > what does this mean?
>
> This is the physical lane and logical lane mapping table, should I add a note for it?
Yes please. Also will the mapping be always static or ever change?
>
> >> + int i;
> >> +
> >> + for (i = 0; i < ARRAY_SIZE(stf_dphy_init_list); i++)
> >> + writel(stf_dphy_init_list[i].val,
> >> + dphy->regs + stf_dphy_init_list[i].addr);
> >> +
> >> + writel(FIELD_PREP(STF_DPHY_DA_CDPHY_R100_CTRL0_2D1C_EFUSE_EN, 1) |
> >> + FIELD_PREP(STF_DPHY_DA_CDPHY_R100_CTRL0_2D1C_EFUSE_IN, 0x1b) |
> >> + FIELD_PREP(STF_DPHY_DA_CDPHY_R100_CTRL1_2D1C_EFUSE_EN, 1) |
> >> + FIELD_PREP(STF_DPHY_DA_CDPHY_R100_CTRL1_2D1C_EFUSE_IN, 0x1b),
> >> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(0));
> >> +
> >> + writel(FIELD_PREP(STF_DPHY_DATA_BUS16_8, 0) |
> >> + FIELD_PREP(STF_DPHY_DEBUG_MODE_SEL, 0x5a),
> >> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(184));
> >> +
> >> + writel(FIELD_PREP(STF_DPHY_ENABLE_CLK, 1) |
> >> + FIELD_PREP(STF_DPHY_ENABLE_CLK1, 1) |
> >> + FIELD_PREP(STF_DPHY_ENABLE_LAN0, 1) |
> >> + FIELD_PREP(STF_DPHY_ENABLE_LAN1, 1) |
> >> + FIELD_PREP(STF_DPHY_ENABLE_LAN2, 1) |
> >> + FIELD_PREP(STF_DPHY_ENABLE_LAN3, 1) |
> >> + FIELD_PREP(STF_DPHY_GPI_EN, 0) |
> >> + FIELD_PREP(STF_DPHY_HS_FREQ_CHANGE_CLK, 0) |
> >> + FIELD_PREP(STF_DPHY_HS_FREQ_CHANGE_CLK1, 0) |
> >> + FIELD_PREP(STF_DPHY_LANE_SWAP_CLK, map[0]) |
> >> + FIELD_PREP(STF_DPHY_LANE_SWAP_CLK1, map[5]) |
> >> + FIELD_PREP(STF_DPHY_LANE_SWAP_LAN0, map[1]) |
> >> + FIELD_PREP(STF_DPHY_LANE_SWAP_LAN1, map[2]),
> >> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(188));
> >> +
> >> + writel(FIELD_PREP(STF_DPHY_LANE_SWAP_LAN2, map[3]) |
> >> + FIELD_PREP(STF_DPHY_LANE_SWAP_LAN3, map[4]) |
> >> + FIELD_PREP(STF_DPHY_MP_TEST_EN, 0) |
> >> + FIELD_PREP(STF_DPHY_MP_TEST_MODE_SEL, 0) |
> >> + FIELD_PREP(STF_DPHY_PLL_CLK_SEL, 0x37c) |
> >> + FIELD_PREP(STF_DPHY_PRECOUNTER_IN_CLK, 8),
> >> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(192));
> >> +
> >> + writel(FIELD_PREP(STF_DPHY_PRECOUNTER_IN_CLK1, 8) |
> >> + FIELD_PREP(STF_DPHY_PRECOUNTER_IN_LAN0, 7) |
> >> + FIELD_PREP(STF_DPHY_PRECOUNTER_IN_LAN1, 7) |
> >> + FIELD_PREP(STF_DPHY_PRECOUNTER_IN_LAN2, 7),
> >> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(196));
> >> +
> >> + writel(FIELD_PREP(STF_DPHY_PRECOUNTER_IN_LAN3, 7) |
> >> + FIELD_PREP(STF_DPHY_RX_1C2C_SEL, 0),
> >> + dphy->regs + STF_DPHY_APBCFGSAIF__SYSCFG(200));
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static int stf_dphy_init(struct phy *phy)
> >> +{
> >> + struct stf_dphy *dphy = phy_get_drvdata(phy);
> >> + int ret;
> >> +
> >> + ret = regulator_enable(dphy->mipi_0p9);
> >> + if (ret)
> >> + goto err_0p9;
> >> +
> >> + if (stf_dphy_info->external_support && stf_dphy_info->external_init)
> >> + stf_dphy_info->external_init(dphy);
> >> +
> >> + return 0;
> >> +
> >> +err_0p9:
> >> + return ret;
> >> +}
> >> +
> >> +static int stf_dphy_exit(struct phy *phy)
> >> +{
> >> + struct stf_dphy *dphy = phy_get_drvdata(phy);
> >> +
> >> + if (stf_dphy_info->external_support && stf_dphy_info->external_exit)
> >> + stf_dphy_info->external_exit(dphy);
> >> +
> >> + regulator_disable(dphy->mipi_0p9);
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static int stf_dphy_power_on(struct phy *phy)
> >> +{
> >> + struct stf_dphy *dphy = phy_get_drvdata(phy);
> >> +
> >> + clk_set_rate(dphy->cfg_clk, 99000000);
> >> + clk_set_rate(dphy->ref_clk, 49500000);
> >> + clk_set_rate(dphy->tx_clk, 19800000);
> >> + reset_control_deassert(dphy->rstc);
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static int stf_dphy_power_off(struct phy *phy)
> >> +{
> >> + struct stf_dphy *dphy = phy_get_drvdata(phy);
> >> +
> >> + reset_control_assert(dphy->rstc);
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static const struct phy_ops stf_dphy_ops = {
> >> + .init = stf_dphy_init,
> >> + .exit = stf_dphy_exit,
> >> + .configure = stf_dphy_configure,
> >> + .power_on = stf_dphy_power_on,
> >> + .power_off = stf_dphy_power_off,
> >> +};
> >> +
> >> +static int stf_dphy_probe(struct platform_device *pdev)
> >> +{
> >> + struct phy_provider *phy_provider;
> >> + struct stf_dphy *dphy;
> >> + int ret;
> >> +
> >> + dphy = devm_kzalloc(&pdev->dev, sizeof(*dphy), GFP_KERNEL);
> >> + if (!dphy)
> >> + return -ENOMEM;
> >> + stf_dphy_info = of_device_get_match_data(&pdev->dev);
> >> + dev_set_drvdata(&pdev->dev, dphy);
> >> + dphy->dev = &pdev->dev;
> >> +
> >> + dphy->regs = devm_platform_ioremap_resource(pdev, 0);
> >> + if (IS_ERR(dphy->regs))
> >> + return PTR_ERR(dphy->regs);
> >> +
> >> + dphy->cfg_clk = devm_clk_get(&pdev->dev, "cfg");
> >> + if (IS_ERR(dphy->cfg_clk))
> >> + return PTR_ERR(dphy->cfg_clk);
> >> +
> >> + dphy->ref_clk = devm_clk_get(&pdev->dev, "ref");
> >> + if (IS_ERR(dphy->ref_clk))
> >> + return PTR_ERR(dphy->ref_clk);
> >> +
> >> + dphy->tx_clk = devm_clk_get(&pdev->dev, "tx");
> >> + if (IS_ERR(dphy->tx_clk))
> >> + return PTR_ERR(dphy->tx_clk);
> >> +
> >> + dphy->rstc = devm_reset_control_array_get_exclusive(&pdev->dev);
> >> + if (IS_ERR(dphy->rstc))
> >> + return PTR_ERR(dphy->rstc);
> >> +
> >> + dphy->mipi_0p9 = devm_regulator_get(&pdev->dev, "mipi_0p9");
> >> + if (IS_ERR(dphy->mipi_0p9))
> >> + return PTR_ERR(dphy->mipi_0p9);
> >> +
> >> + if (stf_dphy_info->external_support && stf_dphy_info->external_get) {
> >> + ret = stf_dphy_info->external_get(dphy);
> >> + if (ret < 0) {
> >> + dev_err(&pdev->dev, "Failed to get PHY external info\n");
> >> + return ret;
> >> + }
> >> + }
> >> +
> >> + dphy->phy = devm_phy_create(&pdev->dev, NULL, &stf_dphy_ops);
> >> + if (IS_ERR(dphy->phy)) {
> >> + dev_err(&pdev->dev, "Failed to create PHY\n");
> >> + return PTR_ERR(dphy->phy);
> >> + }
> >> +
> >> + phy_set_drvdata(dphy->phy, dphy);
> >> + phy_provider = devm_of_phy_provider_register(&pdev->dev,
> >> + of_phy_simple_xlate);
> >> +
> >> + return PTR_ERR_OR_ZERO(phy_provider);
> >> +}
> >> +
> >> +static int stf_external_get(struct stf_dphy *dphy)
> >> +{
> >> + struct of_phandle_args args;
> >> + int ret;
> >> +
> >> + ret = of_parse_phandle_with_fixed_args(dphy->dev->of_node,
> >> + "starfive,aon-syscon",
> >> + 1, 0, &args);
> >> + if (ret < 0) {
> >> + dev_err(dphy->dev, "Failed to parse starfive,aon-syscon\n");
> >> + return -EINVAL;
> >> + }
> >> +
> >> + dphy->stf_aon_syscon = syscon_node_to_regmap(args.np);
> >> + of_node_put(args.np);
> >> + if (IS_ERR(dphy->stf_aon_syscon))
> >> + return PTR_ERR(dphy->stf_aon_syscon);
> >> +
> >> + dphy->aon_gp_reg = args.args[0];
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static void stf_external_init(struct stf_dphy *dphy)
> >> +{
> >> + regmap_update_bits(dphy->stf_aon_syscon, dphy->aon_gp_reg,
> >> + BIT(31), BIT(31));
> >> +}
> >> +
> >> +static void stf_external_exit(struct stf_dphy *dphy)
> >> +{
> >> + regmap_update_bits(dphy->stf_aon_syscon, dphy->aon_gp_reg,
> >> + BIT(31), 0);
> >> +}
> >> +
> >> +static const struct stf_dphy_info starfive_dphy_info = {
> >> + .external_support = true,
> >> + .external_get = stf_external_get,
> >> + .external_init = stf_external_init,
> >> + .external_exit = stf_external_exit,
> >> +};
> >> +
> >> +static const struct of_device_id stf_dphy_dt_ids[] = {
> >> + {
> >> + .compatible = "starfive,jh7110-dphy-rx",
> >> + .data = &starfive_dphy_info,
> >
> > is there a plan to support multiple versions which need different
> > get/init/exit methods?
> >
>
> There is no plan to support multiple versions. So this different methods
> interface can cancel?
yes
>
> >> + },
> >> + { /* sentinel */ },
> >> +};
> >> +MODULE_DEVICE_TABLE(of, stf_dphy_dt_ids);
> >> +
> >> +static struct platform_driver stf_dphy_driver = {
> >> + .probe = stf_dphy_probe,
> >> + .driver = {
> >> + .name = "starfive-dphy-rx",
> >> + .of_match_table = stf_dphy_dt_ids,
> >> + },
> >> +};
> >> +module_platform_driver(stf_dphy_driver);
> >> +
> >> +MODULE_AUTHOR("Jack Zhu <jack.zhu at starfivetech.com>");
> >> +MODULE_AUTHOR("Changhuang Liang <changhuang.liang at starfivetech.com>");
> >> +MODULE_DESCRIPTION("Starfive DPHY RX driver");
> >> +MODULE_LICENSE("GPL");
> >> --
> >> 2.25.1
> >
--
~Vinod
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