diff mbox series

[v6,6/7] phy: amlogic: Add Amlogic AXG PCIE PHY Driver

Message ID 20200123232943.10229-7-repk@triplefau.lt (mailing list archive)
State Accepted, archived
Delegated to: Lorenzo Pieralisi
Headers show
Series PCI: amlogic: Make PCIe working reliably on AXG platforms | expand

Commit Message

Remi Pommarel Jan. 23, 2020, 11:29 p.m. UTC 
This adds support for the PCI PHY found in the Amlogic AXG SoC Family.
This will allow to mutualize code in pci-meson.c between AXG and G12A
SoC.

This PHY also uses and chains an analog PHY, which on AXG platform
is needed to have reliable PCIe communication.

Signed-off-by: Remi Pommarel <repk@triplefau.lt>
---
 drivers/phy/amlogic/Kconfig              |  11 ++
 drivers/phy/amlogic/Makefile             |   1 +
 drivers/phy/amlogic/phy-meson-axg-pcie.c | 192 +++++++++++++++++++++++
 3 files changed, 204 insertions(+)
 create mode 100644 drivers/phy/amlogic/phy-meson-axg-pcie.c

Comments

Neil Armstrong March 4, 2020, 10:47 a.m. UTC | #1 
On 24/01/2020 00:29, Remi Pommarel wrote:
> This adds support for the PCI PHY found in the Amlogic AXG SoC Family.
> This will allow to mutualize code in pci-meson.c between AXG and G12A
> SoC.
> 
> This PHY also uses and chains an analog PHY, which on AXG platform
> is needed to have reliable PCIe communication.
> 
> Signed-off-by: Remi Pommarel <repk@triplefau.lt>
> ---
>  drivers/phy/amlogic/Kconfig              |  11 ++
>  drivers/phy/amlogic/Makefile             |   1 +
>  drivers/phy/amlogic/phy-meson-axg-pcie.c | 192 +++++++++++++++++++++++
>  3 files changed, 204 insertions(+)
>  create mode 100644 drivers/phy/amlogic/phy-meson-axg-pcie.c
> 
> diff --git a/drivers/phy/amlogic/Kconfig b/drivers/phy/amlogic/Kconfig
> index 8c9cf2403591..71801e30d601 100644
> --- a/drivers/phy/amlogic/Kconfig
> +++ b/drivers/phy/amlogic/Kconfig
> @@ -60,6 +60,17 @@ config PHY_MESON_G12A_USB3_PCIE
>  	  in Meson G12A SoCs.
>  	  If unsure, say N.
>  
> +config PHY_MESON_AXG_PCIE
> +	tristate "Meson AXG PCIE PHY driver"
> +	default ARCH_MESON
> +	depends on OF && (ARCH_MESON || COMPILE_TEST)
> +	select GENERIC_PHY
> +	select REGMAP_MMIO
> +	help
> +	  Enable this to support the Meson MIPI + PCIE PHY found
> +	  in Meson AXG SoCs.
> +	  If unsure, say N.
> +
>  config PHY_MESON_AXG_MIPI_PCIE_ANALOG
>  	tristate "Meson AXG MIPI + PCIE analog PHY driver"
>  	default ARCH_MESON
> diff --git a/drivers/phy/amlogic/Makefile b/drivers/phy/amlogic/Makefile
> index 0aecf92d796a..e2baa133f7af 100644
> --- a/drivers/phy/amlogic/Makefile
> +++ b/drivers/phy/amlogic/Makefile
> @@ -4,4 +4,5 @@ obj-$(CONFIG_PHY_MESON_GXL_USB2)		+= phy-meson-gxl-usb2.o
>  obj-$(CONFIG_PHY_MESON_G12A_USB2)		+= phy-meson-g12a-usb2.o
>  obj-$(CONFIG_PHY_MESON_GXL_USB3)		+= phy-meson-gxl-usb3.o
>  obj-$(CONFIG_PHY_MESON_G12A_USB3_PCIE)		+= phy-meson-g12a-usb3-pcie.o
> +obj-$(CONFIG_PHY_MESON_AXG_PCIE)		+= phy-meson-axg-pcie.o
>  obj-$(CONFIG_PHY_MESON_AXG_MIPI_PCIE_ANALOG)	+= phy-meson-axg-mipi-pcie-analog.o
> diff --git a/drivers/phy/amlogic/phy-meson-axg-pcie.c b/drivers/phy/amlogic/phy-meson-axg-pcie.c
> new file mode 100644
> index 000000000000..377ed0dcd0d9
> --- /dev/null
> +++ b/drivers/phy/amlogic/phy-meson-axg-pcie.c
> @@ -0,0 +1,192 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Amlogic AXG PCIE PHY driver
> + *
> + * Copyright (C) 2020 Remi Pommarel <repk@triplefau.lt>
> + */
> +#include <linux/module.h>
> +#include <linux/phy/phy.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +#include <linux/platform_device.h>
> +#include <linux/bitfield.h>
> +#include <dt-bindings/phy/phy.h>
> +
> +#define MESON_PCIE_REG0 0x00
> +#define		MESON_PCIE_COMMON_CLK	BIT(4)
> +#define		MESON_PCIE_PORT_SEL	GENMASK(3, 2)
> +#define		MESON_PCIE_CLK		BIT(1)
> +#define		MESON_PCIE_POWERDOWN	BIT(0)
> +
> +#define MESON_PCIE_TWO_X1		FIELD_PREP(MESON_PCIE_PORT_SEL, 0x3)
> +#define MESON_PCIE_COMMON_REF_CLK	FIELD_PREP(MESON_PCIE_COMMON_CLK, 0x1)
> +#define MESON_PCIE_PHY_INIT		(MESON_PCIE_TWO_X1 |		\
> +					 MESON_PCIE_COMMON_REF_CLK)
> +#define MESON_PCIE_RESET_DELAY		500
> +
> +struct phy_axg_pcie_priv {
> +	struct phy *phy;
> +	struct phy *analog;
> +	struct regmap *regmap;
> +	struct reset_control *reset;
> +};
> +
> +static const struct regmap_config phy_axg_pcie_regmap_conf = {
> +	.reg_bits = 8,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +	.max_register = MESON_PCIE_REG0,
> +};
> +
> +static int phy_axg_pcie_power_on(struct phy *phy)
> +{
> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = phy_power_on(priv->analog);
> +	if (ret != 0)
> +		return ret;
> +
> +	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
> +			   MESON_PCIE_POWERDOWN, 0);
> +	return 0;
> +}
> +
> +static int phy_axg_pcie_power_off(struct phy *phy)
> +{
> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = phy_power_off(priv->analog);
> +	if (ret != 0)
> +		return ret;
> +
> +	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
> +			   MESON_PCIE_POWERDOWN, 1);
> +	return 0;
> +}
> +
> +static int phy_axg_pcie_init(struct phy *phy)
> +{
> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = phy_init(priv->analog);
> +	if (ret != 0)
> +		return ret;
> +
> +	regmap_write(priv->regmap, MESON_PCIE_REG0, MESON_PCIE_PHY_INIT);
> +	return reset_control_reset(priv->reset);
> +}
> +
> +static int phy_axg_pcie_exit(struct phy *phy)
> +{
> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = phy_exit(priv->analog);
> +	if (ret != 0)
> +		return ret;
> +
> +	return reset_control_reset(priv->reset);
> +}
> +
> +static int phy_axg_pcie_reset(struct phy *phy)
> +{
> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> +	int ret = 0;
> +
> +	ret = phy_reset(priv->analog);
> +	if (ret != 0)
> +		goto out;
> +
> +	ret = reset_control_assert(priv->reset);
> +	if (ret != 0)
> +		goto out;
> +	udelay(MESON_PCIE_RESET_DELAY);
> +
> +	ret = reset_control_deassert(priv->reset);
> +	if (ret != 0)
> +		goto out;
> +	udelay(MESON_PCIE_RESET_DELAY);
> +
> +out:
> +	return ret;
> +}
> +
> +static const struct phy_ops phy_axg_pcie_ops = {
> +	.init = phy_axg_pcie_init,
> +	.exit = phy_axg_pcie_exit,
> +	.power_on = phy_axg_pcie_power_on,
> +	.power_off = phy_axg_pcie_power_off,
> +	.reset = phy_axg_pcie_reset,
> +	.owner = THIS_MODULE,
> +};
> +
> +static int phy_axg_pcie_probe(struct platform_device *pdev)
> +{
> +	struct phy_provider *pphy;
> +	struct device *dev = &pdev->dev;
> +	struct phy_axg_pcie_priv *priv;
> +	struct device_node *np = dev->of_node;
> +	struct resource *res;
> +	void __iomem *base;
> +	int ret;
> +
> +	priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->phy = devm_phy_create(dev, np, &phy_axg_pcie_ops);
> +	if (IS_ERR(priv->phy)) {
> +		ret = PTR_ERR(priv->phy);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "failed to create PHY\n");
> +		return ret;
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	base = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	priv->regmap = devm_regmap_init_mmio(dev, base,
> +					     &phy_axg_pcie_regmap_conf);
> +	if (IS_ERR(priv->regmap))
> +		return PTR_ERR(priv->regmap);
> +
> +	priv->reset = devm_reset_control_array_get(dev, false, false);
> +	if (IS_ERR(priv->reset))
> +		return PTR_ERR(priv->reset);
> +
> +	priv->analog = devm_phy_get(dev, "analog");
> +	if (IS_ERR(priv->analog))
> +		return PTR_ERR(priv->analog);
> +
> +	phy_set_drvdata(priv->phy, priv);
> +	dev_set_drvdata(dev, priv);
> +	pphy = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +
> +	return PTR_ERR_OR_ZERO(pphy);
> +}
> +
> +static const struct of_device_id phy_axg_pcie_of_match[] = {
> +	{
> +		.compatible = "amlogic,axg-pcie-phy",
> +	},
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, phy_axg_pcie_of_match);
> +
> +static struct platform_driver phy_axg_pcie_driver = {
> +	.probe = phy_axg_pcie_probe,
> +	.driver = {
> +		.name = "phy-axg-pcie",
> +		.of_match_table = phy_axg_pcie_of_match,
> +	},
> +};
> +module_platform_driver(phy_axg_pcie_driver);
> +
> +MODULE_AUTHOR("Remi Pommarel <repk@triplefau.lt>");
> +MODULE_DESCRIPTION("Amlogic AXG PCIE PHY driver");
> +MODULE_LICENSE("GPL v2");
> 

The changes since v5 are done (make analog phy mandatory), ok for me then.

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Kishon Vijay Abraham I March 4, 2020, 11:01 a.m. UTC | #2 
On 24/01/20 4:59 am, Remi Pommarel wrote:
> This adds support for the PCI PHY found in the Amlogic AXG SoC Family.
> This will allow to mutualize code in pci-meson.c between AXG and G12A
> SoC.
> 
> This PHY also uses and chains an analog PHY, which on AXG platform
> is needed to have reliable PCIe communication.

Is the analog PHY an independent block and can be used with other PHYs?

For the patch itself
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

Thanks
Kishon
> 
> Signed-off-by: Remi Pommarel <repk@triplefau.lt>
> ---
>  drivers/phy/amlogic/Kconfig              |  11 ++
>  drivers/phy/amlogic/Makefile             |   1 +
>  drivers/phy/amlogic/phy-meson-axg-pcie.c | 192 +++++++++++++++++++++++
>  3 files changed, 204 insertions(+)
>  create mode 100644 drivers/phy/amlogic/phy-meson-axg-pcie.c
> 
> diff --git a/drivers/phy/amlogic/Kconfig b/drivers/phy/amlogic/Kconfig
> index 8c9cf2403591..71801e30d601 100644
> --- a/drivers/phy/amlogic/Kconfig
> +++ b/drivers/phy/amlogic/Kconfig
> @@ -60,6 +60,17 @@ config PHY_MESON_G12A_USB3_PCIE
>  	  in Meson G12A SoCs.
>  	  If unsure, say N.
>  
> +config PHY_MESON_AXG_PCIE
> +	tristate "Meson AXG PCIE PHY driver"
> +	default ARCH_MESON
> +	depends on OF && (ARCH_MESON || COMPILE_TEST)
> +	select GENERIC_PHY
> +	select REGMAP_MMIO
> +	help
> +	  Enable this to support the Meson MIPI + PCIE PHY found
> +	  in Meson AXG SoCs.
> +	  If unsure, say N.
> +
>  config PHY_MESON_AXG_MIPI_PCIE_ANALOG
>  	tristate "Meson AXG MIPI + PCIE analog PHY driver"
>  	default ARCH_MESON
> diff --git a/drivers/phy/amlogic/Makefile b/drivers/phy/amlogic/Makefile
> index 0aecf92d796a..e2baa133f7af 100644
> --- a/drivers/phy/amlogic/Makefile
> +++ b/drivers/phy/amlogic/Makefile
> @@ -4,4 +4,5 @@ obj-$(CONFIG_PHY_MESON_GXL_USB2)		+= phy-meson-gxl-usb2.o
>  obj-$(CONFIG_PHY_MESON_G12A_USB2)		+= phy-meson-g12a-usb2.o
>  obj-$(CONFIG_PHY_MESON_GXL_USB3)		+= phy-meson-gxl-usb3.o
>  obj-$(CONFIG_PHY_MESON_G12A_USB3_PCIE)		+= phy-meson-g12a-usb3-pcie.o
> +obj-$(CONFIG_PHY_MESON_AXG_PCIE)		+= phy-meson-axg-pcie.o
>  obj-$(CONFIG_PHY_MESON_AXG_MIPI_PCIE_ANALOG)	+= phy-meson-axg-mipi-pcie-analog.o
> diff --git a/drivers/phy/amlogic/phy-meson-axg-pcie.c b/drivers/phy/amlogic/phy-meson-axg-pcie.c
> new file mode 100644
> index 000000000000..377ed0dcd0d9
> --- /dev/null
> +++ b/drivers/phy/amlogic/phy-meson-axg-pcie.c
> @@ -0,0 +1,192 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Amlogic AXG PCIE PHY driver
> + *
> + * Copyright (C) 2020 Remi Pommarel <repk@triplefau.lt>
> + */
> +#include <linux/module.h>
> +#include <linux/phy/phy.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +#include <linux/platform_device.h>
> +#include <linux/bitfield.h>
> +#include <dt-bindings/phy/phy.h>
> +
> +#define MESON_PCIE_REG0 0x00
> +#define		MESON_PCIE_COMMON_CLK	BIT(4)
> +#define		MESON_PCIE_PORT_SEL	GENMASK(3, 2)
> +#define		MESON_PCIE_CLK		BIT(1)
> +#define		MESON_PCIE_POWERDOWN	BIT(0)
> +
> +#define MESON_PCIE_TWO_X1		FIELD_PREP(MESON_PCIE_PORT_SEL, 0x3)
> +#define MESON_PCIE_COMMON_REF_CLK	FIELD_PREP(MESON_PCIE_COMMON_CLK, 0x1)
> +#define MESON_PCIE_PHY_INIT		(MESON_PCIE_TWO_X1 |		\
> +					 MESON_PCIE_COMMON_REF_CLK)
> +#define MESON_PCIE_RESET_DELAY		500
> +
> +struct phy_axg_pcie_priv {
> +	struct phy *phy;
> +	struct phy *analog;
> +	struct regmap *regmap;
> +	struct reset_control *reset;
> +};
> +
> +static const struct regmap_config phy_axg_pcie_regmap_conf = {
> +	.reg_bits = 8,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +	.max_register = MESON_PCIE_REG0,
> +};
> +
> +static int phy_axg_pcie_power_on(struct phy *phy)
> +{
> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = phy_power_on(priv->analog);
> +	if (ret != 0)
> +		return ret;
> +
> +	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
> +			   MESON_PCIE_POWERDOWN, 0);
> +	return 0;
> +}
> +
> +static int phy_axg_pcie_power_off(struct phy *phy)
> +{
> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = phy_power_off(priv->analog);
> +	if (ret != 0)
> +		return ret;
> +
> +	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
> +			   MESON_PCIE_POWERDOWN, 1);
> +	return 0;
> +}
> +
> +static int phy_axg_pcie_init(struct phy *phy)
> +{
> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = phy_init(priv->analog);
> +	if (ret != 0)
> +		return ret;
> +
> +	regmap_write(priv->regmap, MESON_PCIE_REG0, MESON_PCIE_PHY_INIT);
> +	return reset_control_reset(priv->reset);
> +}
> +
> +static int phy_axg_pcie_exit(struct phy *phy)
> +{
> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = phy_exit(priv->analog);
> +	if (ret != 0)
> +		return ret;
> +
> +	return reset_control_reset(priv->reset);
> +}
> +
> +static int phy_axg_pcie_reset(struct phy *phy)
> +{
> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> +	int ret = 0;
> +
> +	ret = phy_reset(priv->analog);
> +	if (ret != 0)
> +		goto out;
> +
> +	ret = reset_control_assert(priv->reset);
> +	if (ret != 0)
> +		goto out;
> +	udelay(MESON_PCIE_RESET_DELAY);
> +
> +	ret = reset_control_deassert(priv->reset);
> +	if (ret != 0)
> +		goto out;
> +	udelay(MESON_PCIE_RESET_DELAY);
> +
> +out:
> +	return ret;
> +}
> +
> +static const struct phy_ops phy_axg_pcie_ops = {
> +	.init = phy_axg_pcie_init,
> +	.exit = phy_axg_pcie_exit,
> +	.power_on = phy_axg_pcie_power_on,
> +	.power_off = phy_axg_pcie_power_off,
> +	.reset = phy_axg_pcie_reset,
> +	.owner = THIS_MODULE,
> +};
> +
> +static int phy_axg_pcie_probe(struct platform_device *pdev)
> +{
> +	struct phy_provider *pphy;
> +	struct device *dev = &pdev->dev;
> +	struct phy_axg_pcie_priv *priv;
> +	struct device_node *np = dev->of_node;
> +	struct resource *res;
> +	void __iomem *base;
> +	int ret;
> +
> +	priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->phy = devm_phy_create(dev, np, &phy_axg_pcie_ops);
> +	if (IS_ERR(priv->phy)) {
> +		ret = PTR_ERR(priv->phy);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "failed to create PHY\n");
> +		return ret;
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	base = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	priv->regmap = devm_regmap_init_mmio(dev, base,
> +					     &phy_axg_pcie_regmap_conf);
> +	if (IS_ERR(priv->regmap))
> +		return PTR_ERR(priv->regmap);
> +
> +	priv->reset = devm_reset_control_array_get(dev, false, false);
> +	if (IS_ERR(priv->reset))
> +		return PTR_ERR(priv->reset);
> +
> +	priv->analog = devm_phy_get(dev, "analog");
> +	if (IS_ERR(priv->analog))
> +		return PTR_ERR(priv->analog);
> +
> +	phy_set_drvdata(priv->phy, priv);
> +	dev_set_drvdata(dev, priv);
> +	pphy = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +
> +	return PTR_ERR_OR_ZERO(pphy);
> +}
> +
> +static const struct of_device_id phy_axg_pcie_of_match[] = {
> +	{
> +		.compatible = "amlogic,axg-pcie-phy",
> +	},
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, phy_axg_pcie_of_match);
> +
> +static struct platform_driver phy_axg_pcie_driver = {
> +	.probe = phy_axg_pcie_probe,
> +	.driver = {
> +		.name = "phy-axg-pcie",
> +		.of_match_table = phy_axg_pcie_of_match,
> +	},
> +};
> +module_platform_driver(phy_axg_pcie_driver);
> +
> +MODULE_AUTHOR("Remi Pommarel <repk@triplefau.lt>");
> +MODULE_DESCRIPTION("Amlogic AXG PCIE PHY driver");
> +MODULE_LICENSE("GPL v2");
>
Remi Pommarel March 4, 2020, 1:08 p.m. UTC | #3 
On Wed, Mar 04, 2020 at 04:31:24PM +0530, Kishon Vijay Abraham I wrote:
> 
> 
> On 24/01/20 4:59 am, Remi Pommarel wrote:
> > This adds support for the PCI PHY found in the Amlogic AXG SoC Family.
> > This will allow to mutualize code in pci-meson.c between AXG and G12A
> > SoC.
> > 
> > This PHY also uses and chains an analog PHY, which on AXG platform
> > is needed to have reliable PCIe communication.
> 
> Is the analog PHY an independent block and can be used with other PHYs?

It is documented as a separate block yes, but I think it is unlikely
that it will be used with other PHYs than the PCIe or the MIPI one of
the AXG SoC.

Thanks,
Remi

> 
> For the patch itself
> Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
> 
> Thanks
> Kishon
> > 
> > Signed-off-by: Remi Pommarel <repk@triplefau.lt>
> > ---
> >  drivers/phy/amlogic/Kconfig              |  11 ++
> >  drivers/phy/amlogic/Makefile             |   1 +
> >  drivers/phy/amlogic/phy-meson-axg-pcie.c | 192 +++++++++++++++++++++++
> >  3 files changed, 204 insertions(+)
> >  create mode 100644 drivers/phy/amlogic/phy-meson-axg-pcie.c
> > 
> > diff --git a/drivers/phy/amlogic/Kconfig b/drivers/phy/amlogic/Kconfig
> > index 8c9cf2403591..71801e30d601 100644
> > --- a/drivers/phy/amlogic/Kconfig
> > +++ b/drivers/phy/amlogic/Kconfig
> > @@ -60,6 +60,17 @@ config PHY_MESON_G12A_USB3_PCIE
> >  	  in Meson G12A SoCs.
> >  	  If unsure, say N.
> >  
> > +config PHY_MESON_AXG_PCIE
> > +	tristate "Meson AXG PCIE PHY driver"
> > +	default ARCH_MESON
> > +	depends on OF && (ARCH_MESON || COMPILE_TEST)
> > +	select GENERIC_PHY
> > +	select REGMAP_MMIO
> > +	help
> > +	  Enable this to support the Meson MIPI + PCIE PHY found
> > +	  in Meson AXG SoCs.
> > +	  If unsure, say N.
> > +
> >  config PHY_MESON_AXG_MIPI_PCIE_ANALOG
> >  	tristate "Meson AXG MIPI + PCIE analog PHY driver"
> >  	default ARCH_MESON
> > diff --git a/drivers/phy/amlogic/Makefile b/drivers/phy/amlogic/Makefile
> > index 0aecf92d796a..e2baa133f7af 100644
> > --- a/drivers/phy/amlogic/Makefile
> > +++ b/drivers/phy/amlogic/Makefile
> > @@ -4,4 +4,5 @@ obj-$(CONFIG_PHY_MESON_GXL_USB2)		+= phy-meson-gxl-usb2.o
> >  obj-$(CONFIG_PHY_MESON_G12A_USB2)		+= phy-meson-g12a-usb2.o
> >  obj-$(CONFIG_PHY_MESON_GXL_USB3)		+= phy-meson-gxl-usb3.o
> >  obj-$(CONFIG_PHY_MESON_G12A_USB3_PCIE)		+= phy-meson-g12a-usb3-pcie.o
> > +obj-$(CONFIG_PHY_MESON_AXG_PCIE)		+= phy-meson-axg-pcie.o
> >  obj-$(CONFIG_PHY_MESON_AXG_MIPI_PCIE_ANALOG)	+= phy-meson-axg-mipi-pcie-analog.o
> > diff --git a/drivers/phy/amlogic/phy-meson-axg-pcie.c b/drivers/phy/amlogic/phy-meson-axg-pcie.c
> > new file mode 100644
> > index 000000000000..377ed0dcd0d9
> > --- /dev/null
> > +++ b/drivers/phy/amlogic/phy-meson-axg-pcie.c
> > @@ -0,0 +1,192 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Amlogic AXG PCIE PHY driver
> > + *
> > + * Copyright (C) 2020 Remi Pommarel <repk@triplefau.lt>
> > + */
> > +#include <linux/module.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/regmap.h>
> > +#include <linux/reset.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/bitfield.h>
> > +#include <dt-bindings/phy/phy.h>
> > +
> > +#define MESON_PCIE_REG0 0x00
> > +#define		MESON_PCIE_COMMON_CLK	BIT(4)
> > +#define		MESON_PCIE_PORT_SEL	GENMASK(3, 2)
> > +#define		MESON_PCIE_CLK		BIT(1)
> > +#define		MESON_PCIE_POWERDOWN	BIT(0)
> > +
> > +#define MESON_PCIE_TWO_X1		FIELD_PREP(MESON_PCIE_PORT_SEL, 0x3)
> > +#define MESON_PCIE_COMMON_REF_CLK	FIELD_PREP(MESON_PCIE_COMMON_CLK, 0x1)
> > +#define MESON_PCIE_PHY_INIT		(MESON_PCIE_TWO_X1 |		\
> > +					 MESON_PCIE_COMMON_REF_CLK)
> > +#define MESON_PCIE_RESET_DELAY		500
> > +
> > +struct phy_axg_pcie_priv {
> > +	struct phy *phy;
> > +	struct phy *analog;
> > +	struct regmap *regmap;
> > +	struct reset_control *reset;
> > +};
> > +
> > +static const struct regmap_config phy_axg_pcie_regmap_conf = {
> > +	.reg_bits = 8,
> > +	.val_bits = 32,
> > +	.reg_stride = 4,
> > +	.max_register = MESON_PCIE_REG0,
> > +};
> > +
> > +static int phy_axg_pcie_power_on(struct phy *phy)
> > +{
> > +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> > +	int ret;
> > +
> > +	ret = phy_power_on(priv->analog);
> > +	if (ret != 0)
> > +		return ret;
> > +
> > +	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
> > +			   MESON_PCIE_POWERDOWN, 0);
> > +	return 0;
> > +}
> > +
> > +static int phy_axg_pcie_power_off(struct phy *phy)
> > +{
> > +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> > +	int ret;
> > +
> > +	ret = phy_power_off(priv->analog);
> > +	if (ret != 0)
> > +		return ret;
> > +
> > +	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
> > +			   MESON_PCIE_POWERDOWN, 1);
> > +	return 0;
> > +}
> > +
> > +static int phy_axg_pcie_init(struct phy *phy)
> > +{
> > +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> > +	int ret;
> > +
> > +	ret = phy_init(priv->analog);
> > +	if (ret != 0)
> > +		return ret;
> > +
> > +	regmap_write(priv->regmap, MESON_PCIE_REG0, MESON_PCIE_PHY_INIT);
> > +	return reset_control_reset(priv->reset);
> > +}
> > +
> > +static int phy_axg_pcie_exit(struct phy *phy)
> > +{
> > +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> > +	int ret;
> > +
> > +	ret = phy_exit(priv->analog);
> > +	if (ret != 0)
> > +		return ret;
> > +
> > +	return reset_control_reset(priv->reset);
> > +}
> > +
> > +static int phy_axg_pcie_reset(struct phy *phy)
> > +{
> > +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
> > +	int ret = 0;
> > +
> > +	ret = phy_reset(priv->analog);
> > +	if (ret != 0)
> > +		goto out;
> > +
> > +	ret = reset_control_assert(priv->reset);
> > +	if (ret != 0)
> > +		goto out;
> > +	udelay(MESON_PCIE_RESET_DELAY);
> > +
> > +	ret = reset_control_deassert(priv->reset);
> > +	if (ret != 0)
> > +		goto out;
> > +	udelay(MESON_PCIE_RESET_DELAY);
> > +
> > +out:
> > +	return ret;
> > +}
> > +
> > +static const struct phy_ops phy_axg_pcie_ops = {
> > +	.init = phy_axg_pcie_init,
> > +	.exit = phy_axg_pcie_exit,
> > +	.power_on = phy_axg_pcie_power_on,
> > +	.power_off = phy_axg_pcie_power_off,
> > +	.reset = phy_axg_pcie_reset,
> > +	.owner = THIS_MODULE,
> > +};
> > +
> > +static int phy_axg_pcie_probe(struct platform_device *pdev)
> > +{
> > +	struct phy_provider *pphy;
> > +	struct device *dev = &pdev->dev;
> > +	struct phy_axg_pcie_priv *priv;
> > +	struct device_node *np = dev->of_node;
> > +	struct resource *res;
> > +	void __iomem *base;
> > +	int ret;
> > +
> > +	priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL);
> > +	if (!priv)
> > +		return -ENOMEM;
> > +
> > +	priv->phy = devm_phy_create(dev, np, &phy_axg_pcie_ops);
> > +	if (IS_ERR(priv->phy)) {
> > +		ret = PTR_ERR(priv->phy);
> > +		if (ret != -EPROBE_DEFER)
> > +			dev_err(dev, "failed to create PHY\n");
> > +		return ret;
> > +	}
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	base = devm_ioremap_resource(dev, res);
> > +	if (IS_ERR(base))
> > +		return PTR_ERR(base);
> > +
> > +	priv->regmap = devm_regmap_init_mmio(dev, base,
> > +					     &phy_axg_pcie_regmap_conf);
> > +	if (IS_ERR(priv->regmap))
> > +		return PTR_ERR(priv->regmap);
> > +
> > +	priv->reset = devm_reset_control_array_get(dev, false, false);
> > +	if (IS_ERR(priv->reset))
> > +		return PTR_ERR(priv->reset);
> > +
> > +	priv->analog = devm_phy_get(dev, "analog");
> > +	if (IS_ERR(priv->analog))
> > +		return PTR_ERR(priv->analog);
> > +
> > +	phy_set_drvdata(priv->phy, priv);
> > +	dev_set_drvdata(dev, priv);
> > +	pphy = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> > +
> > +	return PTR_ERR_OR_ZERO(pphy);
> > +}
> > +
> > +static const struct of_device_id phy_axg_pcie_of_match[] = {
> > +	{
> > +		.compatible = "amlogic,axg-pcie-phy",
> > +	},
> > +	{ },
> > +};
> > +MODULE_DEVICE_TABLE(of, phy_axg_pcie_of_match);
> > +
> > +static struct platform_driver phy_axg_pcie_driver = {
> > +	.probe = phy_axg_pcie_probe,
> > +	.driver = {
> > +		.name = "phy-axg-pcie",
> > +		.of_match_table = phy_axg_pcie_of_match,
> > +	},
> > +};
> > +module_platform_driver(phy_axg_pcie_driver);
> > +
> > +MODULE_AUTHOR("Remi Pommarel <repk@triplefau.lt>");
> > +MODULE_DESCRIPTION("Amlogic AXG PCIE PHY driver");
> > +MODULE_LICENSE("GPL v2");
> >
Kishon Vijay Abraham I March 5, 2020, 4:56 a.m. UTC | #4 
Hi,

On 04/03/20 6:38 pm, Remi Pommarel wrote:
> On Wed, Mar 04, 2020 at 04:31:24PM +0530, Kishon Vijay Abraham I wrote:
>>
>>
>> On 24/01/20 4:59 am, Remi Pommarel wrote:
>>> This adds support for the PCI PHY found in the Amlogic AXG SoC Family.
>>> This will allow to mutualize code in pci-meson.c between AXG and G12A
>>> SoC.
>>>
>>> This PHY also uses and chains an analog PHY, which on AXG platform
>>> is needed to have reliable PCIe communication.
>>
>> Is the analog PHY an independent block and can be used with other PHYs?
> 
> It is documented as a separate block yes, but I think it is unlikely
> that it will be used with other PHYs than the PCIe or the MIPI one of
> the AXG SoC.

Shouldn't we then have a single PHY driver instead of chaining PHYs?

Thanks
Kishon

> 
> Thanks,
> Remi
> 
>>
>> For the patch itself
>> Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
>>
>> Thanks
>> Kishon
>>>
>>> Signed-off-by: Remi Pommarel <repk@triplefau.lt>
>>> ---
>>>  drivers/phy/amlogic/Kconfig              |  11 ++
>>>  drivers/phy/amlogic/Makefile             |   1 +
>>>  drivers/phy/amlogic/phy-meson-axg-pcie.c | 192 +++++++++++++++++++++++
>>>  3 files changed, 204 insertions(+)
>>>  create mode 100644 drivers/phy/amlogic/phy-meson-axg-pcie.c
>>>
>>> diff --git a/drivers/phy/amlogic/Kconfig b/drivers/phy/amlogic/Kconfig
>>> index 8c9cf2403591..71801e30d601 100644
>>> --- a/drivers/phy/amlogic/Kconfig
>>> +++ b/drivers/phy/amlogic/Kconfig
>>> @@ -60,6 +60,17 @@ config PHY_MESON_G12A_USB3_PCIE
>>>  	  in Meson G12A SoCs.
>>>  	  If unsure, say N.
>>>  
>>> +config PHY_MESON_AXG_PCIE
>>> +	tristate "Meson AXG PCIE PHY driver"
>>> +	default ARCH_MESON
>>> +	depends on OF && (ARCH_MESON || COMPILE_TEST)
>>> +	select GENERIC_PHY
>>> +	select REGMAP_MMIO
>>> +	help
>>> +	  Enable this to support the Meson MIPI + PCIE PHY found
>>> +	  in Meson AXG SoCs.
>>> +	  If unsure, say N.
>>> +
>>>  config PHY_MESON_AXG_MIPI_PCIE_ANALOG
>>>  	tristate "Meson AXG MIPI + PCIE analog PHY driver"
>>>  	default ARCH_MESON
>>> diff --git a/drivers/phy/amlogic/Makefile b/drivers/phy/amlogic/Makefile
>>> index 0aecf92d796a..e2baa133f7af 100644
>>> --- a/drivers/phy/amlogic/Makefile
>>> +++ b/drivers/phy/amlogic/Makefile
>>> @@ -4,4 +4,5 @@ obj-$(CONFIG_PHY_MESON_GXL_USB2)		+= phy-meson-gxl-usb2.o
>>>  obj-$(CONFIG_PHY_MESON_G12A_USB2)		+= phy-meson-g12a-usb2.o
>>>  obj-$(CONFIG_PHY_MESON_GXL_USB3)		+= phy-meson-gxl-usb3.o
>>>  obj-$(CONFIG_PHY_MESON_G12A_USB3_PCIE)		+= phy-meson-g12a-usb3-pcie.o
>>> +obj-$(CONFIG_PHY_MESON_AXG_PCIE)		+= phy-meson-axg-pcie.o
>>>  obj-$(CONFIG_PHY_MESON_AXG_MIPI_PCIE_ANALOG)	+= phy-meson-axg-mipi-pcie-analog.o
>>> diff --git a/drivers/phy/amlogic/phy-meson-axg-pcie.c b/drivers/phy/amlogic/phy-meson-axg-pcie.c
>>> new file mode 100644
>>> index 000000000000..377ed0dcd0d9
>>> --- /dev/null
>>> +++ b/drivers/phy/amlogic/phy-meson-axg-pcie.c
>>> @@ -0,0 +1,192 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/*
>>> + * Amlogic AXG PCIE PHY driver
>>> + *
>>> + * Copyright (C) 2020 Remi Pommarel <repk@triplefau.lt>
>>> + */
>>> +#include <linux/module.h>
>>> +#include <linux/phy/phy.h>
>>> +#include <linux/regmap.h>
>>> +#include <linux/reset.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/bitfield.h>
>>> +#include <dt-bindings/phy/phy.h>
>>> +
>>> +#define MESON_PCIE_REG0 0x00
>>> +#define		MESON_PCIE_COMMON_CLK	BIT(4)
>>> +#define		MESON_PCIE_PORT_SEL	GENMASK(3, 2)
>>> +#define		MESON_PCIE_CLK		BIT(1)
>>> +#define		MESON_PCIE_POWERDOWN	BIT(0)
>>> +
>>> +#define MESON_PCIE_TWO_X1		FIELD_PREP(MESON_PCIE_PORT_SEL, 0x3)
>>> +#define MESON_PCIE_COMMON_REF_CLK	FIELD_PREP(MESON_PCIE_COMMON_CLK, 0x1)
>>> +#define MESON_PCIE_PHY_INIT		(MESON_PCIE_TWO_X1 |		\
>>> +					 MESON_PCIE_COMMON_REF_CLK)
>>> +#define MESON_PCIE_RESET_DELAY		500
>>> +
>>> +struct phy_axg_pcie_priv {
>>> +	struct phy *phy;
>>> +	struct phy *analog;
>>> +	struct regmap *regmap;
>>> +	struct reset_control *reset;
>>> +};
>>> +
>>> +static const struct regmap_config phy_axg_pcie_regmap_conf = {
>>> +	.reg_bits = 8,
>>> +	.val_bits = 32,
>>> +	.reg_stride = 4,
>>> +	.max_register = MESON_PCIE_REG0,
>>> +};
>>> +
>>> +static int phy_axg_pcie_power_on(struct phy *phy)
>>> +{
>>> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
>>> +	int ret;
>>> +
>>> +	ret = phy_power_on(priv->analog);
>>> +	if (ret != 0)
>>> +		return ret;
>>> +
>>> +	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
>>> +			   MESON_PCIE_POWERDOWN, 0);
>>> +	return 0;
>>> +}
>>> +
>>> +static int phy_axg_pcie_power_off(struct phy *phy)
>>> +{
>>> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
>>> +	int ret;
>>> +
>>> +	ret = phy_power_off(priv->analog);
>>> +	if (ret != 0)
>>> +		return ret;
>>> +
>>> +	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
>>> +			   MESON_PCIE_POWERDOWN, 1);
>>> +	return 0;
>>> +}
>>> +
>>> +static int phy_axg_pcie_init(struct phy *phy)
>>> +{
>>> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
>>> +	int ret;
>>> +
>>> +	ret = phy_init(priv->analog);
>>> +	if (ret != 0)
>>> +		return ret;
>>> +
>>> +	regmap_write(priv->regmap, MESON_PCIE_REG0, MESON_PCIE_PHY_INIT);
>>> +	return reset_control_reset(priv->reset);
>>> +}
>>> +
>>> +static int phy_axg_pcie_exit(struct phy *phy)
>>> +{
>>> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
>>> +	int ret;
>>> +
>>> +	ret = phy_exit(priv->analog);
>>> +	if (ret != 0)
>>> +		return ret;
>>> +
>>> +	return reset_control_reset(priv->reset);
>>> +}
>>> +
>>> +static int phy_axg_pcie_reset(struct phy *phy)
>>> +{
>>> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
>>> +	int ret = 0;
>>> +
>>> +	ret = phy_reset(priv->analog);
>>> +	if (ret != 0)
>>> +		goto out;
>>> +
>>> +	ret = reset_control_assert(priv->reset);
>>> +	if (ret != 0)
>>> +		goto out;
>>> +	udelay(MESON_PCIE_RESET_DELAY);
>>> +
>>> +	ret = reset_control_deassert(priv->reset);
>>> +	if (ret != 0)
>>> +		goto out;
>>> +	udelay(MESON_PCIE_RESET_DELAY);
>>> +
>>> +out:
>>> +	return ret;
>>> +}
>>> +
>>> +static const struct phy_ops phy_axg_pcie_ops = {
>>> +	.init = phy_axg_pcie_init,
>>> +	.exit = phy_axg_pcie_exit,
>>> +	.power_on = phy_axg_pcie_power_on,
>>> +	.power_off = phy_axg_pcie_power_off,
>>> +	.reset = phy_axg_pcie_reset,
>>> +	.owner = THIS_MODULE,
>>> +};
>>> +
>>> +static int phy_axg_pcie_probe(struct platform_device *pdev)
>>> +{
>>> +	struct phy_provider *pphy;
>>> +	struct device *dev = &pdev->dev;
>>> +	struct phy_axg_pcie_priv *priv;
>>> +	struct device_node *np = dev->of_node;
>>> +	struct resource *res;
>>> +	void __iomem *base;
>>> +	int ret;
>>> +
>>> +	priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL);
>>> +	if (!priv)
>>> +		return -ENOMEM;
>>> +
>>> +	priv->phy = devm_phy_create(dev, np, &phy_axg_pcie_ops);
>>> +	if (IS_ERR(priv->phy)) {
>>> +		ret = PTR_ERR(priv->phy);
>>> +		if (ret != -EPROBE_DEFER)
>>> +			dev_err(dev, "failed to create PHY\n");
>>> +		return ret;
>>> +	}
>>> +
>>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> +	base = devm_ioremap_resource(dev, res);
>>> +	if (IS_ERR(base))
>>> +		return PTR_ERR(base);
>>> +
>>> +	priv->regmap = devm_regmap_init_mmio(dev, base,
>>> +					     &phy_axg_pcie_regmap_conf);
>>> +	if (IS_ERR(priv->regmap))
>>> +		return PTR_ERR(priv->regmap);
>>> +
>>> +	priv->reset = devm_reset_control_array_get(dev, false, false);
>>> +	if (IS_ERR(priv->reset))
>>> +		return PTR_ERR(priv->reset);
>>> +
>>> +	priv->analog = devm_phy_get(dev, "analog");
>>> +	if (IS_ERR(priv->analog))
>>> +		return PTR_ERR(priv->analog);
>>> +
>>> +	phy_set_drvdata(priv->phy, priv);
>>> +	dev_set_drvdata(dev, priv);
>>> +	pphy = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
>>> +
>>> +	return PTR_ERR_OR_ZERO(pphy);
>>> +}
>>> +
>>> +static const struct of_device_id phy_axg_pcie_of_match[] = {
>>> +	{
>>> +		.compatible = "amlogic,axg-pcie-phy",
>>> +	},
>>> +	{ },
>>> +};
>>> +MODULE_DEVICE_TABLE(of, phy_axg_pcie_of_match);
>>> +
>>> +static struct platform_driver phy_axg_pcie_driver = {
>>> +	.probe = phy_axg_pcie_probe,
>>> +	.driver = {
>>> +		.name = "phy-axg-pcie",
>>> +		.of_match_table = phy_axg_pcie_of_match,
>>> +	},
>>> +};
>>> +module_platform_driver(phy_axg_pcie_driver);
>>> +
>>> +MODULE_AUTHOR("Remi Pommarel <repk@triplefau.lt>");
>>> +MODULE_DESCRIPTION("Amlogic AXG PCIE PHY driver");
>>> +MODULE_LICENSE("GPL v2");
>>>
Neil Armstrong March 5, 2020, 7 a.m. UTC | #5 
Hi,

Le 05/03/2020 à 05:56, Kishon Vijay Abraham I a écrit :
> Hi,
> 
> On 04/03/20 6:38 pm, Remi Pommarel wrote:
>> On Wed, Mar 04, 2020 at 04:31:24PM +0530, Kishon Vijay Abraham I wrote:
>>>
>>>
>>> On 24/01/20 4:59 am, Remi Pommarel wrote:
>>>> This adds support for the PCI PHY found in the Amlogic AXG SoC Family.
>>>> This will allow to mutualize code in pci-meson.c between AXG and G12A
>>>> SoC.
>>>>
>>>> This PHY also uses and chains an analog PHY, which on AXG platform
>>>> is needed to have reliable PCIe communication.
>>>
>>> Is the analog PHY an independent block and can be used with other PHYs?
>>
>> It is documented as a separate block yes, but I think it is unlikely
>> that it will be used with other PHYs than the PCIe or the MIPI one of
>> the AXG SoC.
> 
> Shouldn't we then have a single PHY driver instead of chaining PHYs?

The chaining is necessary because the MIPI/PCIe analogi PHY will be reused on
recent platform with similar MIPI DSI PHY, but these platforms have their PCIe PHY
combined with USB3 (see g12a-usb3-pcie combo phy).

Neil

> 
> Thanks
> Kishon
> 
>>
>> Thanks,
>> Remi
>>
>>>
>>> For the patch itself
>>> Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
>>>
>>> Thanks
>>> Kishon
>>>>
>>>> Signed-off-by: Remi Pommarel <repk@triplefau.lt>
>>>> ---
>>>>  drivers/phy/amlogic/Kconfig              |  11 ++
>>>>  drivers/phy/amlogic/Makefile             |   1 +
>>>>  drivers/phy/amlogic/phy-meson-axg-pcie.c | 192 +++++++++++++++++++++++
>>>>  3 files changed, 204 insertions(+)
>>>>  create mode 100644 drivers/phy/amlogic/phy-meson-axg-pcie.c
>>>>
>>>> diff --git a/drivers/phy/amlogic/Kconfig b/drivers/phy/amlogic/Kconfig
>>>> index 8c9cf2403591..71801e30d601 100644
>>>> --- a/drivers/phy/amlogic/Kconfig
>>>> +++ b/drivers/phy/amlogic/Kconfig
>>>> @@ -60,6 +60,17 @@ config PHY_MESON_G12A_USB3_PCIE
>>>>  	  in Meson G12A SoCs.
>>>>  	  If unsure, say N.
>>>>  
>>>> +config PHY_MESON_AXG_PCIE
>>>> +	tristate "Meson AXG PCIE PHY driver"
>>>> +	default ARCH_MESON
>>>> +	depends on OF && (ARCH_MESON || COMPILE_TEST)
>>>> +	select GENERIC_PHY
>>>> +	select REGMAP_MMIO
>>>> +	help
>>>> +	  Enable this to support the Meson MIPI + PCIE PHY found
>>>> +	  in Meson AXG SoCs.
>>>> +	  If unsure, say N.
>>>> +
>>>>  config PHY_MESON_AXG_MIPI_PCIE_ANALOG
>>>>  	tristate "Meson AXG MIPI + PCIE analog PHY driver"
>>>>  	default ARCH_MESON
>>>> diff --git a/drivers/phy/amlogic/Makefile b/drivers/phy/amlogic/Makefile
>>>> index 0aecf92d796a..e2baa133f7af 100644
>>>> --- a/drivers/phy/amlogic/Makefile
>>>> +++ b/drivers/phy/amlogic/Makefile
>>>> @@ -4,4 +4,5 @@ obj-$(CONFIG_PHY_MESON_GXL_USB2)		+= phy-meson-gxl-usb2.o
>>>>  obj-$(CONFIG_PHY_MESON_G12A_USB2)		+= phy-meson-g12a-usb2.o
>>>>  obj-$(CONFIG_PHY_MESON_GXL_USB3)		+= phy-meson-gxl-usb3.o
>>>>  obj-$(CONFIG_PHY_MESON_G12A_USB3_PCIE)		+= phy-meson-g12a-usb3-pcie.o
>>>> +obj-$(CONFIG_PHY_MESON_AXG_PCIE)		+= phy-meson-axg-pcie.o
>>>>  obj-$(CONFIG_PHY_MESON_AXG_MIPI_PCIE_ANALOG)	+= phy-meson-axg-mipi-pcie-analog.o
>>>> diff --git a/drivers/phy/amlogic/phy-meson-axg-pcie.c b/drivers/phy/amlogic/phy-meson-axg-pcie.c
>>>> new file mode 100644
>>>> index 000000000000..377ed0dcd0d9
>>>> --- /dev/null
>>>> +++ b/drivers/phy/amlogic/phy-meson-axg-pcie.c
>>>> @@ -0,0 +1,192 @@
>>>> +// SPDX-License-Identifier: GPL-2.0
>>>> +/*
>>>> + * Amlogic AXG PCIE PHY driver
>>>> + *
>>>> + * Copyright (C) 2020 Remi Pommarel <repk@triplefau.lt>
>>>> + */
>>>> +#include <linux/module.h>
>>>> +#include <linux/phy/phy.h>
>>>> +#include <linux/regmap.h>
>>>> +#include <linux/reset.h>
>>>> +#include <linux/platform_device.h>
>>>> +#include <linux/bitfield.h>
>>>> +#include <dt-bindings/phy/phy.h>
>>>> +
>>>> +#define MESON_PCIE_REG0 0x00
>>>> +#define		MESON_PCIE_COMMON_CLK	BIT(4)
>>>> +#define		MESON_PCIE_PORT_SEL	GENMASK(3, 2)
>>>> +#define		MESON_PCIE_CLK		BIT(1)
>>>> +#define		MESON_PCIE_POWERDOWN	BIT(0)
>>>> +
>>>> +#define MESON_PCIE_TWO_X1		FIELD_PREP(MESON_PCIE_PORT_SEL, 0x3)
>>>> +#define MESON_PCIE_COMMON_REF_CLK	FIELD_PREP(MESON_PCIE_COMMON_CLK, 0x1)
>>>> +#define MESON_PCIE_PHY_INIT		(MESON_PCIE_TWO_X1 |		\
>>>> +					 MESON_PCIE_COMMON_REF_CLK)
>>>> +#define MESON_PCIE_RESET_DELAY		500
>>>> +
>>>> +struct phy_axg_pcie_priv {
>>>> +	struct phy *phy;
>>>> +	struct phy *analog;
>>>> +	struct regmap *regmap;
>>>> +	struct reset_control *reset;
>>>> +};
>>>> +
>>>> +static const struct regmap_config phy_axg_pcie_regmap_conf = {
>>>> +	.reg_bits = 8,
>>>> +	.val_bits = 32,
>>>> +	.reg_stride = 4,
>>>> +	.max_register = MESON_PCIE_REG0,
>>>> +};
>>>> +
>>>> +static int phy_axg_pcie_power_on(struct phy *phy)
>>>> +{
>>>> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
>>>> +	int ret;
>>>> +
>>>> +	ret = phy_power_on(priv->analog);
>>>> +	if (ret != 0)
>>>> +		return ret;
>>>> +
>>>> +	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
>>>> +			   MESON_PCIE_POWERDOWN, 0);
>>>> +	return 0;
>>>> +}
>>>> +
>>>> +static int phy_axg_pcie_power_off(struct phy *phy)
>>>> +{
>>>> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
>>>> +	int ret;
>>>> +
>>>> +	ret = phy_power_off(priv->analog);
>>>> +	if (ret != 0)
>>>> +		return ret;
>>>> +
>>>> +	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
>>>> +			   MESON_PCIE_POWERDOWN, 1);
>>>> +	return 0;
>>>> +}
>>>> +
>>>> +static int phy_axg_pcie_init(struct phy *phy)
>>>> +{
>>>> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
>>>> +	int ret;
>>>> +
>>>> +	ret = phy_init(priv->analog);
>>>> +	if (ret != 0)
>>>> +		return ret;
>>>> +
>>>> +	regmap_write(priv->regmap, MESON_PCIE_REG0, MESON_PCIE_PHY_INIT);
>>>> +	return reset_control_reset(priv->reset);
>>>> +}
>>>> +
>>>> +static int phy_axg_pcie_exit(struct phy *phy)
>>>> +{
>>>> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
>>>> +	int ret;
>>>> +
>>>> +	ret = phy_exit(priv->analog);
>>>> +	if (ret != 0)
>>>> +		return ret;
>>>> +
>>>> +	return reset_control_reset(priv->reset);
>>>> +}
>>>> +
>>>> +static int phy_axg_pcie_reset(struct phy *phy)
>>>> +{
>>>> +	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
>>>> +	int ret = 0;
>>>> +
>>>> +	ret = phy_reset(priv->analog);
>>>> +	if (ret != 0)
>>>> +		goto out;
>>>> +
>>>> +	ret = reset_control_assert(priv->reset);
>>>> +	if (ret != 0)
>>>> +		goto out;
>>>> +	udelay(MESON_PCIE_RESET_DELAY);
>>>> +
>>>> +	ret = reset_control_deassert(priv->reset);
>>>> +	if (ret != 0)
>>>> +		goto out;
>>>> +	udelay(MESON_PCIE_RESET_DELAY);
>>>> +
>>>> +out:
>>>> +	return ret;
>>>> +}
>>>> +
>>>> +static const struct phy_ops phy_axg_pcie_ops = {
>>>> +	.init = phy_axg_pcie_init,
>>>> +	.exit = phy_axg_pcie_exit,
>>>> +	.power_on = phy_axg_pcie_power_on,
>>>> +	.power_off = phy_axg_pcie_power_off,
>>>> +	.reset = phy_axg_pcie_reset,
>>>> +	.owner = THIS_MODULE,
>>>> +};
>>>> +
>>>> +static int phy_axg_pcie_probe(struct platform_device *pdev)
>>>> +{
>>>> +	struct phy_provider *pphy;
>>>> +	struct device *dev = &pdev->dev;
>>>> +	struct phy_axg_pcie_priv *priv;
>>>> +	struct device_node *np = dev->of_node;
>>>> +	struct resource *res;
>>>> +	void __iomem *base;
>>>> +	int ret;
>>>> +
>>>> +	priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL);
>>>> +	if (!priv)
>>>> +		return -ENOMEM;
>>>> +
>>>> +	priv->phy = devm_phy_create(dev, np, &phy_axg_pcie_ops);
>>>> +	if (IS_ERR(priv->phy)) {
>>>> +		ret = PTR_ERR(priv->phy);
>>>> +		if (ret != -EPROBE_DEFER)
>>>> +			dev_err(dev, "failed to create PHY\n");
>>>> +		return ret;
>>>> +	}
>>>> +
>>>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>>> +	base = devm_ioremap_resource(dev, res);
>>>> +	if (IS_ERR(base))
>>>> +		return PTR_ERR(base);
>>>> +
>>>> +	priv->regmap = devm_regmap_init_mmio(dev, base,
>>>> +					     &phy_axg_pcie_regmap_conf);
>>>> +	if (IS_ERR(priv->regmap))
>>>> +		return PTR_ERR(priv->regmap);
>>>> +
>>>> +	priv->reset = devm_reset_control_array_get(dev, false, false);
>>>> +	if (IS_ERR(priv->reset))
>>>> +		return PTR_ERR(priv->reset);
>>>> +
>>>> +	priv->analog = devm_phy_get(dev, "analog");
>>>> +	if (IS_ERR(priv->analog))
>>>> +		return PTR_ERR(priv->analog);
>>>> +
>>>> +	phy_set_drvdata(priv->phy, priv);
>>>> +	dev_set_drvdata(dev, priv);
>>>> +	pphy = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
>>>> +
>>>> +	return PTR_ERR_OR_ZERO(pphy);
>>>> +}
>>>> +
>>>> +static const struct of_device_id phy_axg_pcie_of_match[] = {
>>>> +	{
>>>> +		.compatible = "amlogic,axg-pcie-phy",
>>>> +	},
>>>> +	{ },
>>>> +};
>>>> +MODULE_DEVICE_TABLE(of, phy_axg_pcie_of_match);
>>>> +
>>>> +static struct platform_driver phy_axg_pcie_driver = {
>>>> +	.probe = phy_axg_pcie_probe,
>>>> +	.driver = {
>>>> +		.name = "phy-axg-pcie",
>>>> +		.of_match_table = phy_axg_pcie_of_match,
>>>> +	},
>>>> +};
>>>> +module_platform_driver(phy_axg_pcie_driver);
>>>> +
>>>> +MODULE_AUTHOR("Remi Pommarel <repk@triplefau.lt>");
>>>> +MODULE_DESCRIPTION("Amlogic AXG PCIE PHY driver");
>>>> +MODULE_LICENSE("GPL v2");
>>>>
diff mbox series

Patch

diff --git a/drivers/phy/amlogic/Kconfig b/drivers/phy/amlogic/Kconfig
index 8c9cf2403591..71801e30d601 100644
--- a/drivers/phy/amlogic/Kconfig
+++ b/drivers/phy/amlogic/Kconfig
@@ -60,6 +60,17 @@  config PHY_MESON_G12A_USB3_PCIE
 	  in Meson G12A SoCs.
 	  If unsure, say N.
 
+config PHY_MESON_AXG_PCIE
+	tristate "Meson AXG PCIE PHY driver"
+	default ARCH_MESON
+	depends on OF && (ARCH_MESON || COMPILE_TEST)
+	select GENERIC_PHY
+	select REGMAP_MMIO
+	help
+	  Enable this to support the Meson MIPI + PCIE PHY found
+	  in Meson AXG SoCs.
+	  If unsure, say N.
+
 config PHY_MESON_AXG_MIPI_PCIE_ANALOG
 	tristate "Meson AXG MIPI + PCIE analog PHY driver"
 	default ARCH_MESON
diff --git a/drivers/phy/amlogic/Makefile b/drivers/phy/amlogic/Makefile
index 0aecf92d796a..e2baa133f7af 100644
--- a/drivers/phy/amlogic/Makefile
+++ b/drivers/phy/amlogic/Makefile
@@ -4,4 +4,5 @@  obj-$(CONFIG_PHY_MESON_GXL_USB2)		+= phy-meson-gxl-usb2.o
 obj-$(CONFIG_PHY_MESON_G12A_USB2)		+= phy-meson-g12a-usb2.o
 obj-$(CONFIG_PHY_MESON_GXL_USB3)		+= phy-meson-gxl-usb3.o
 obj-$(CONFIG_PHY_MESON_G12A_USB3_PCIE)		+= phy-meson-g12a-usb3-pcie.o
+obj-$(CONFIG_PHY_MESON_AXG_PCIE)		+= phy-meson-axg-pcie.o
 obj-$(CONFIG_PHY_MESON_AXG_MIPI_PCIE_ANALOG)	+= phy-meson-axg-mipi-pcie-analog.o
diff --git a/drivers/phy/amlogic/phy-meson-axg-pcie.c b/drivers/phy/amlogic/phy-meson-axg-pcie.c
new file mode 100644
index 000000000000..377ed0dcd0d9
--- /dev/null
+++ b/drivers/phy/amlogic/phy-meson-axg-pcie.c
@@ -0,0 +1,192 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Amlogic AXG PCIE PHY driver
+ *
+ * Copyright (C) 2020 Remi Pommarel <repk@triplefau.lt>
+ */
+#include <linux/module.h>
+#include <linux/phy/phy.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/platform_device.h>
+#include <linux/bitfield.h>
+#include <dt-bindings/phy/phy.h>
+
+#define MESON_PCIE_REG0 0x00
+#define		MESON_PCIE_COMMON_CLK	BIT(4)
+#define		MESON_PCIE_PORT_SEL	GENMASK(3, 2)
+#define		MESON_PCIE_CLK		BIT(1)
+#define		MESON_PCIE_POWERDOWN	BIT(0)
+
+#define MESON_PCIE_TWO_X1		FIELD_PREP(MESON_PCIE_PORT_SEL, 0x3)
+#define MESON_PCIE_COMMON_REF_CLK	FIELD_PREP(MESON_PCIE_COMMON_CLK, 0x1)
+#define MESON_PCIE_PHY_INIT		(MESON_PCIE_TWO_X1 |		\
+					 MESON_PCIE_COMMON_REF_CLK)
+#define MESON_PCIE_RESET_DELAY		500
+
+struct phy_axg_pcie_priv {
+	struct phy *phy;
+	struct phy *analog;
+	struct regmap *regmap;
+	struct reset_control *reset;
+};
+
+static const struct regmap_config phy_axg_pcie_regmap_conf = {
+	.reg_bits = 8,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = MESON_PCIE_REG0,
+};
+
+static int phy_axg_pcie_power_on(struct phy *phy)
+{
+	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
+	int ret;
+
+	ret = phy_power_on(priv->analog);
+	if (ret != 0)
+		return ret;
+
+	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
+			   MESON_PCIE_POWERDOWN, 0);
+	return 0;
+}
+
+static int phy_axg_pcie_power_off(struct phy *phy)
+{
+	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
+	int ret;
+
+	ret = phy_power_off(priv->analog);
+	if (ret != 0)
+		return ret;
+
+	regmap_update_bits(priv->regmap, MESON_PCIE_REG0,
+			   MESON_PCIE_POWERDOWN, 1);
+	return 0;
+}
+
+static int phy_axg_pcie_init(struct phy *phy)
+{
+	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
+	int ret;
+
+	ret = phy_init(priv->analog);
+	if (ret != 0)
+		return ret;
+
+	regmap_write(priv->regmap, MESON_PCIE_REG0, MESON_PCIE_PHY_INIT);
+	return reset_control_reset(priv->reset);
+}
+
+static int phy_axg_pcie_exit(struct phy *phy)
+{
+	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
+	int ret;
+
+	ret = phy_exit(priv->analog);
+	if (ret != 0)
+		return ret;
+
+	return reset_control_reset(priv->reset);
+}
+
+static int phy_axg_pcie_reset(struct phy *phy)
+{
+	struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy);
+	int ret = 0;
+
+	ret = phy_reset(priv->analog);
+	if (ret != 0)
+		goto out;
+
+	ret = reset_control_assert(priv->reset);
+	if (ret != 0)
+		goto out;
+	udelay(MESON_PCIE_RESET_DELAY);
+
+	ret = reset_control_deassert(priv->reset);
+	if (ret != 0)
+		goto out;
+	udelay(MESON_PCIE_RESET_DELAY);
+
+out:
+	return ret;
+}
+
+static const struct phy_ops phy_axg_pcie_ops = {
+	.init = phy_axg_pcie_init,
+	.exit = phy_axg_pcie_exit,
+	.power_on = phy_axg_pcie_power_on,
+	.power_off = phy_axg_pcie_power_off,
+	.reset = phy_axg_pcie_reset,
+	.owner = THIS_MODULE,
+};
+
+static int phy_axg_pcie_probe(struct platform_device *pdev)
+{
+	struct phy_provider *pphy;
+	struct device *dev = &pdev->dev;
+	struct phy_axg_pcie_priv *priv;
+	struct device_node *np = dev->of_node;
+	struct resource *res;
+	void __iomem *base;
+	int ret;
+
+	priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->phy = devm_phy_create(dev, np, &phy_axg_pcie_ops);
+	if (IS_ERR(priv->phy)) {
+		ret = PTR_ERR(priv->phy);
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "failed to create PHY\n");
+		return ret;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	priv->regmap = devm_regmap_init_mmio(dev, base,
+					     &phy_axg_pcie_regmap_conf);
+	if (IS_ERR(priv->regmap))
+		return PTR_ERR(priv->regmap);
+
+	priv->reset = devm_reset_control_array_get(dev, false, false);
+	if (IS_ERR(priv->reset))
+		return PTR_ERR(priv->reset);
+
+	priv->analog = devm_phy_get(dev, "analog");
+	if (IS_ERR(priv->analog))
+		return PTR_ERR(priv->analog);
+
+	phy_set_drvdata(priv->phy, priv);
+	dev_set_drvdata(dev, priv);
+	pphy = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+	return PTR_ERR_OR_ZERO(pphy);
+}
+
+static const struct of_device_id phy_axg_pcie_of_match[] = {
+	{
+		.compatible = "amlogic,axg-pcie-phy",
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, phy_axg_pcie_of_match);
+
+static struct platform_driver phy_axg_pcie_driver = {
+	.probe = phy_axg_pcie_probe,
+	.driver = {
+		.name = "phy-axg-pcie",
+		.of_match_table = phy_axg_pcie_of_match,
+	},
+};
+module_platform_driver(phy_axg_pcie_driver);
+
+MODULE_AUTHOR("Remi Pommarel <repk@triplefau.lt>");
+MODULE_DESCRIPTION("Amlogic AXG PCIE PHY driver");
+MODULE_LICENSE("GPL v2");