Currently just trying to learn by reading, but a minor comment inline. On Sat, Mar 04, 2017 at 11:22:31PM +0100, Martin Blumenstingl wrote: > This adds a new driver for the USB2 PHYs found on Meson GXL and GXM SoCs > (both SoCs are using the same USB PHY register layout). > > The USB2 PHY is a simple PHY which only has a few registers to configure > the mode (host/device) and a reset register (to enable/disable the PHY). > > Unfortunately there are no datasheets available for any of these PHYs. > Both drivers were written by reading the reference drivers provided by > Amlogic and analyzing the registers on the kernel that was shipped on > the boards I have. > > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> > --- > drivers/phy/Kconfig | 13 ++ > drivers/phy/Makefile | 1 + > drivers/phy/phy-meson-gxl-usb2.c | 263 +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 277 insertions(+) > create mode 100644 drivers/phy/phy-meson-gxl-usb2.c > > diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig > index e8eb7f225a88..7d64711a837f 100644 > --- a/drivers/phy/Kconfig > +++ b/drivers/phy/Kconfig > @@ -486,4 +486,17 @@ config PHY_MESON8B_USB2 > and GXBB SoCs. > If unsure, say N. > > +config PHY_MESON_GXL_USB > + tristate "Meson GXL and GXM USB2 PHY drivers" > + default ARCH_MESON > + depends on OF && (ARCH_MESON || COMPILE_TEST) > + depends on USB_SUPPORT > + select USB_COMMON > + select GENERIC_PHY > + select REGMAP_MMIO > + help > + Enable this to support the Meson USB2 PHYs found in Meson > + GXL and GXM SoCs. > + If unsure, say N. > + > endmenu > diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile > index 65eb2f436a41..a3a2c7dd5c06 100644 > --- a/drivers/phy/Makefile > +++ b/drivers/phy/Makefile > @@ -59,3 +59,4 @@ obj-$(CONFIG_PHY_CYGNUS_PCIE) += phy-bcm-cygnus-pcie.o > obj-$(CONFIG_ARCH_TEGRA) += tegra/ > obj-$(CONFIG_PHY_NS2_PCIE) += phy-bcm-ns2-pcie.o > obj-$(CONFIG_PHY_MESON8B_USB2) += phy-meson8b-usb2.o > +obj-$(CONFIG_PHY_MESON_GXL_USB) += phy-meson-gxl-usb2.o > diff --git a/drivers/phy/phy-meson-gxl-usb2.c b/drivers/phy/phy-meson-gxl-usb2.c > new file mode 100644 > index 000000000000..841a6d9722d4 > --- /dev/null > +++ b/drivers/phy/phy-meson-gxl-usb2.c > @@ -0,0 +1,263 @@ > +/* > + * Meson GXL and GXM USB2 PHY driver > + * > + * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program. If not, see <http://www.gnu.org/licenses/>. > + */ > + > +#include <linux/delay.h> > +#include <linux/io.h> > +#include <linux/module.h> > +#include <linux/of_device.h> > +#include <linux/regmap.h> > +#include <linux/phy/phy.h> > +#include <linux/platform_device.h> > +#include <linux/usb/of.h> > + > +/* bits [31:27] are read-only */ > +#define U2P_R0 0x0 > + #define U2P_R0_BYPASS_SEL BIT(0) > + #define U2P_R0_BYPASS_DM_EN BIT(1) > + #define U2P_R0_BYPASS_DP_EN BIT(2) > + #define U2P_R0_TXBITSTUFF_ENH BIT(3) > + #define U2P_R0_TXBITSTUFF_EN BIT(4) > + #define U2P_R0_DM_PULLDOWN BIT(5) > + #define U2P_R0_DP_PULLDOWN BIT(6) > + #define U2P_R0_DP_VBUS_VLD_EXT_SEL BIT(7) > + #define U2P_R0_DP_VBUS_VLD_EXT BIT(8) > + #define U2P_R0_ADP_PRB_EN BIT(9) > + #define U2P_R0_ADP_DISCHARGE BIT(10) > + #define U2P_R0_ADP_CHARGE BIT(11) > + #define U2P_R0_DRV_VBUS BIT(12) > + #define U2P_R0_ID_PULLUP BIT(13) > + #define U2P_R0_LOOPBACK_EN_B BIT(14) > + #define U2P_R0_OTG_DISABLE BIT(15) > + #define U2P_R0_COMMON_ONN BIT(16) > + #define U2P_R0_FSEL_MASK GENMASK(19, 17) > + #define U2P_R0_REF_CLK_SEL_MASK GENMASK(21, 20) > + #define U2P_R0_POWER_ON_RESET BIT(22) > + #define U2P_R0_V_ATE_TEST_EN_B_MASK GENMASK(24, 23) > + #define U2P_R0_ID_SET_ID_DQ BIT(25) > + #define U2P_R0_ATE_RESET BIT(26) > + #define U2P_R0_FSV_MINUS BIT(27) > + #define U2P_R0_FSV_PLUS BIT(28) > + #define U2P_R0_BYPASS_DM_DATA BIT(29) > + #define U2P_R0_BYPASS_DP_DATA BIT(30) > + > +#define U2P_R1 0x4 > + #define U2P_R1_BURN_IN_TEST BIT(0) > + #define U2P_R1_ACA_ENABLE BIT(1) > + #define U2P_R1_DCD_ENABLE BIT(2) > + #define U2P_R1_VDAT_SRC_EN_B BIT(3) > + #define U2P_R1_VDAT_DET_EN_B BIT(4) > + #define U2P_R1_CHARGES_SEL BIT(5) > + #define U2P_R1_TX_PREEMP_PULSE_TUNE BIT(6) > + #define U2P_R1_TX_PREEMP_AMP_TUNE_MASK GENMASK(8, 7) > + #define U2P_R1_TX_RES_TUNE_MASK GENMASK(10, 9) > + #define U2P_R1_TX_RISE_TUNE_MASK GENMASK(12, 11) > + #define U2P_R1_TX_VREF_TUNE_MASK GENMASK(16, 13) > + #define U2P_R1_TX_FSLS_TUNE_MASK GENMASK(20, 17) > + #define U2P_R1_TX_HSXV_TUNE_MASK GENMASK(22, 21) > + #define U2P_R1_OTG_TUNE_MASK GENMASK(25, 23) > + #define U2P_R1_SQRX_TUNE_MASK GENMASK(28, 26) > + #define U2P_R1_COMP_DIS_TUNE_MASK GENMASK(31, 29) > + > +/* bits [31:14] are read-only */ > +#define U2P_R2 0x8 > + #define U2P_R2_DATA_IN_MASK GENMASK(3, 0) > + #define U2P_R2_DATA_IN_EN_MASK GENMASK(7, 4) > + #define U2P_R2_ADDR_MASK GENMASK(11, 8) > + #define U2P_R2_DATA_OUT_SEL BIT(12) > + #define U2P_R2_CLK BIT(13) > + #define U2P_R2_DATA_OUT_MASK GENMASK(17, 14) > + #define U2P_R2_ACA_PIN_RANGE_C BIT(18) > + #define U2P_R2_ACA_PIN_RANGE_B BIT(19) > + #define U2P_R2_ACA_PIN_RANGE_A BIT(20) > + #define U2P_R2_ACA_PIN_GND BIT(21) > + #define U2P_R2_ACA_PIN_FLOAT BIT(22) > + #define U2P_R2_CHARGE_DETECT BIT(23) > + #define U2P_R2_DEVICE_SESSION_VALID BIT(24) > + #define U2P_R2_ADP_PROBE BIT(25) > + #define U2P_R2_ADP_SENSE BIT(26) > + #define U2P_R2_SESSION_END BIT(27) > + #define U2P_R2_VBUS_VALID BIT(28) > + #define U2P_R2_B_VALID BIT(29) > + #define U2P_R2_A_VALID BIT(30) > + #define U2P_R2_ID_DIG BIT(31) > + > +#define U2P_R3 0xc > + > +#define RESET_COMPLETE_TIME 500 > + > +struct phy_meson_gxl_usb2_priv { > + struct regmap *regmap; > + enum phy_mode mode; > + int is_enabled; > +}; > + > +static const struct regmap_config phy_meson_gxl_usb2_regmap_conf = { > + .reg_bits = 8, > + .val_bits = 32, > + .reg_stride = 4, > + .max_register = U2P_R3, > +}; > + > +static int phy_meson_gxl_usb2_set_mode(struct phy *phy, enum phy_mode mode) > +{ > + struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy); > + > + switch (mode) { > + case PHY_MODE_USB_HOST: > + case PHY_MODE_USB_OTG: > + regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN, > + U2P_R0_DM_PULLDOWN); > + regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN, > + U2P_R0_DP_PULLDOWN); > + regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP, 0); > + break; > + > + case PHY_MODE_USB_DEVICE: > + regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DM_PULLDOWN, > + 0); > + regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_DP_PULLDOWN, > + 0); > + regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_ID_PULLUP, > + U2P_R0_ID_PULLUP); > + break; > + > + default: > + return -EINVAL; > + } > + > + if (priv->is_enabled) { > + /* reset the PHY and wait until settings are stabilized */ > + regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET, > + U2P_R0_POWER_ON_RESET); > + udelay(RESET_COMPLETE_TIME); > + regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET, > + 0); > + udelay(RESET_COMPLETE_TIME); > + } > + > + priv->mode = mode; > + > + return 0; > +} > + > +static int phy_meson_gxl_usb2_power_off(struct phy *phy) > +{ > + struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy); > + > + priv->is_enabled = 0; > + > + /* power off the PHY by putting it into reset mode */ > + regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET, > + U2P_R0_POWER_ON_RESET); > + > + return 0; > +} > + > +static int phy_meson_gxl_usb2_power_on(struct phy *phy) > +{ > + struct phy_meson_gxl_usb2_priv *priv = phy_get_drvdata(phy); > + int ret; > + > + priv->is_enabled = 1; > + > + /* power on the PHY by taking it out of reset mode */ > + regmap_update_bits(priv->regmap, U2P_R0, U2P_R0_POWER_ON_RESET, 0); > + > + ret = phy_meson_gxl_usb2_set_mode(phy, priv->mode); > + if (ret) { > + phy_meson_gxl_usb2_power_off(phy); > + > + dev_err(&phy->dev, "Failed to initialize PHY with mode %d\n", > + priv->mode); Shouldn't priv->is_enabled be reseted to 0 in this case? > + return ret; > + } > + > + return 0; This can be merged with return ret from the error case. > +} > + > +static const struct phy_ops phy_meson_gxl_usb2_ops = { > + .power_on = phy_meson_gxl_usb2_power_on, > + .power_off = phy_meson_gxl_usb2_power_off, > + .set_mode = phy_meson_gxl_usb2_set_mode, > + .owner = THIS_MODULE, > +}; > + > +static int phy_meson_gxl_usb2_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct phy_provider *phy_provider; > + struct resource *res; > + struct phy_meson_gxl_usb2_priv *priv; > + struct phy *phy; > + void __iomem *base; > + > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + platform_set_drvdata(pdev, priv); > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + base = devm_ioremap_resource(dev, res); > + if (IS_ERR(base)) > + return PTR_ERR(base); > + > + switch (of_usb_get_dr_mode_by_phy(dev->of_node, -1)) { > + case USB_DR_MODE_PERIPHERAL: > + priv->mode = PHY_MODE_USB_DEVICE; > + break; > + case USB_DR_MODE_OTG: > + priv->mode = PHY_MODE_USB_OTG; > + break; > + case USB_DR_MODE_HOST: > + default: > + priv->mode = PHY_MODE_USB_HOST; > + break; > + } > + > + priv->regmap = devm_regmap_init_mmio(dev, base, > + &phy_meson_gxl_usb2_regmap_conf); > + if (IS_ERR(priv->regmap)) > + return PTR_ERR(priv->regmap); > + > + phy = devm_phy_create(dev, NULL, &phy_meson_gxl_usb2_ops); > + if (IS_ERR(phy)) { > + dev_err(dev, "failed to create PHY\n"); > + return PTR_ERR(phy); > + } > + > + phy_set_drvdata(phy, priv); > + > + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); > + > + return PTR_ERR_OR_ZERO(phy_provider); > +} > + > +static const struct of_device_id phy_meson_gxl_usb2_of_match[] = { > + { .compatible = "amlogic,meson-gxl-usb2-phy", }, > + { }, > +}; > +MODULE_DEVICE_TABLE(of, phy_meson_gxl_usb2_of_match); > + > +static struct platform_driver phy_meson_gxl_usb2_driver = { > + .probe = phy_meson_gxl_usb2_probe, > + .driver = { > + .name = "phy-meson-gxl-usb2", > + .of_match_table = phy_meson_gxl_usb2_of_match, > + }, > +}; > +module_platform_driver(phy_meson_gxl_usb2_driver); > + > +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>"); > +MODULE_DESCRIPTION("Meson GXL and GXM USB2 PHY driver"); > +MODULE_LICENSE("GPL v2"); > -- > 2.12.0 > > > _______________________________________________ > linux-amlogic mailing list > linux-amlogic@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-amlogic -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
