Message-ID: <55132FD0.2000103@ti.com>
Date:	Thu, 26 Mar 2015 03:29:44 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Brian Norris <computersforpeace@...il.com>,
	Tejun Heo <tj@...nel.org>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Gregory Fong <gregory.0xf0@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-ide@...r.kernel.org>
Subject: Re: [PATCH 4/5] phy: add Broadcom SATA3 PHY driver for Broadcom STB
 SoCs

Hi,

On Thursday 19 March 2015 06:53 AM, Brian Norris wrote:
> Supports up to two ports which can each be powered on/off and configured
> independently.
> 
> Signed-off-by: Brian Norris <computersforpeace@...il.com>
> ---
>  drivers/phy/Kconfig            |   9 ++
>  drivers/phy/Makefile           |   1 +
>  drivers/phy/phy-brcmstb-sata.c | 333 +++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 343 insertions(+)
>  create mode 100644 drivers/phy/phy-brcmstb-sata.c
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 2962de205ba7..c8b22074bcf6 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -291,4 +291,13 @@ config PHY_QCOM_UFS
>  	help
>  	  Support for UFS PHY on QCOM chipsets.
>  
> +config PHY_BRCMSTB_SATA
> +	tristate "Broadcom STB SATA PHY driver"
> +	depends on ARCH_BRCMSTB
> +	depends on OF
> +	select GENERIC_PHY
> +	help
> +	  Enable this to support the SATA3 PHY on 28nm Broadcom STB SoCs.
> +	  Likely useful only with CONFIG_SATA_BRCMSTB enabled.
> +
>  endmenu
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index f080e1bb2a74..28a10804b4f4 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -38,3 +38,4 @@ obj-$(CONFIG_PHY_STIH41X_USB)		+= phy-stih41x-usb.o
>  obj-$(CONFIG_PHY_QCOM_UFS) 	+= phy-qcom-ufs.o
>  obj-$(CONFIG_PHY_QCOM_UFS) 	+= phy-qcom-ufs-qmp-20nm.o
>  obj-$(CONFIG_PHY_QCOM_UFS) 	+= phy-qcom-ufs-qmp-14nm.o
> +obj-$(CONFIG_PHY_BRCMSTB_SATA)		+= phy-brcmstb-sata.o
> diff --git a/drivers/phy/phy-brcmstb-sata.c b/drivers/phy/phy-brcmstb-sata.c
> new file mode 100644
> index 000000000000..413bc94225ac
> --- /dev/null
> +++ b/drivers/phy/phy-brcmstb-sata.c
> @@ -0,0 +1,333 @@
> +/*
> + * Broadcom SATA3 AHCI Controller PHY Driver
> + *
> + * Copyright © 2009-2015 Broadcom Corporation
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2, or (at your option)
> + * any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +
> +#define SATA_MDIO_BANK_OFFSET				0x23c
> +#define SATA_MDIO_REG_OFFSET(ofs)			((ofs) * 4)
> +#define SATA_MDIO_REG_SPACE_SIZE			0x1000
> +#define SATA_MDIO_REG_LENGTH				0x1f00
> +
> +#define SATA_TOP_CTRL_PHY_CTRL_1			0x0
> + #define SATA_TOP_CTRL_1_PHY_DEFAULT_POWER_STATE	BIT(14)
> +
> +#define SATA_TOP_CTRL_PHY_CTRL_2			0x4
> + #define SATA_TOP_CTRL_2_SW_RST_MDIOREG			BIT(0)
> + #define SATA_TOP_CTRL_2_SW_RST_OOB			BIT(1)
> + #define SATA_TOP_CTRL_2_SW_RST_RX			BIT(2)
> + #define SATA_TOP_CTRL_2_SW_RST_TX			BIT(3)
> + #define SATA_TOP_CTRL_2_PHY_GLOBAL_RESET		BIT(14)
> +
> +#define MAX_PORTS					2
> +/* Register offset between PHYs in port-ctrl */
> +#define SATA_TOP_CTRL_PHY_CTRL_LEN			0x8
> +/* Register offset between PHYs in PCB space */
> +#define SATA_MDIO_REG_SPACE_SIZE			0x1000
> +
> +struct brcm_sata_port {
> +	int portnum;
> +	struct phy *phy;
> +	struct brcm_sata_phy *phy_priv;
> +	bool ssc_en;
> +};
> +
> +struct brcm_sata_phy {
> +	struct device *dev;
> +	void __iomem *port_ctrl;
> +	void __iomem *phy_base;
> +
> +	struct brcm_sata_port phys[MAX_PORTS];

Can't we allocate memory for the PHYs dynamically?
> +};
> +
> +enum sata_mdio_phy_regs_28nm {
> +	PLL_REG_BANK_0				= 0x50,
> +	PLL_REG_BANK_0_PLLCONTROL_0		= 0x81,
> +
> +	TXPMD_REG_BANK				= 0x1a0,
> +	TXPMD_CONTROL1				= 0x81,
> +	TXPMD_CONTROL1_TX_SSC_EN_FRC		= BIT(0),
> +	TXPMD_CONTROL1_TX_SSC_EN_FRC_VAL	= BIT(1),
> +	TXPMD_TX_FREQ_CTRL_CONTROL1		= 0x82,
> +	TXPMD_TX_FREQ_CTRL_CONTROL2		= 0x83,
> +	TXPMD_TX_FREQ_CTRL_CONTROL2_FMIN_MASK	= 0x3ff,
> +	TXPMD_TX_FREQ_CTRL_CONTROL3		= 0x84,
> +	TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK	= 0x3ff,
> +};
> +
> +static inline void __iomem *sata_phy_get_port_ctrl(struct brcm_sata_port *port)
> +{
> +	struct brcm_sata_phy *priv = port->phy_priv;
> +
> +	return priv->port_ctrl + (port->portnum * SATA_TOP_CTRL_PHY_CTRL_LEN);
> +}
> +static inline void __iomem *sata_phy_get_phy_base(struct brcm_sata_port *port)

please use consistent names for all functions. Prefix all the functions
with brcmstb.
> +{
> +	struct brcm_sata_phy *priv = port->phy_priv;
> +
> +	return priv->phy_base + (port->portnum * SATA_MDIO_REG_SPACE_SIZE);
> +}
> +
> +static void brcm_sata_mdio_wr(void __iomem *addr, u32 bank, u32 ofs,
> +			      u32 msk, u32 value)
> +{
> +	u32 tmp;
> +
> +	writel(bank, addr + SATA_MDIO_BANK_OFFSET);
> +	tmp = readl(addr + SATA_MDIO_REG_OFFSET(ofs));
> +	tmp = (tmp & msk) | value;
> +	writel(tmp, addr + SATA_MDIO_REG_OFFSET(ofs));
> +}
> +
> +/* These defaults were characterized by H/W group */
> +#define FMIN_VAL_DEFAULT	0x3df
> +#define FMAX_VAL_DEFAULT	0x3df
> +#define FMAX_VAL_SSC		0x83
> +
> +static void cfg_ssc_28nm(struct brcm_sata_port *port)
> +{
> +	void __iomem *base = sata_phy_get_phy_base(port);
> +	struct brcm_sata_phy *priv = port->phy_priv;
> +	u32 tmp;
> +
> +	/* override the TX spread spectrum setting */
> +	tmp = TXPMD_CONTROL1_TX_SSC_EN_FRC_VAL | TXPMD_CONTROL1_TX_SSC_EN_FRC;
> +	brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_CONTROL1, ~tmp, tmp);
> +
> +	/* set fixed min freq */
> +	brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_TX_FREQ_CTRL_CONTROL2,
> +			  ~TXPMD_TX_FREQ_CTRL_CONTROL2_FMIN_MASK,
> +			  FMIN_VAL_DEFAULT);
> +
> +	/* set fixed max freq depending on SSC config */
> +	if (port->ssc_en) {
> +		dev_info(priv->dev, "enabling SSC on port %d\n", port->portnum);
> +		tmp = FMAX_VAL_SSC;
> +	} else {
> +		tmp = FMAX_VAL_DEFAULT;
> +	}
> +
> +	brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_TX_FREQ_CTRL_CONTROL3,
> +			  ~TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK, tmp);
> +}
> +
> +static void brcm_sata_phy_enable(struct brcm_sata_port *port)
> +{
> +	void __iomem *port_ctrl = sata_phy_get_port_ctrl(port);
> +	void __iomem *p;
> +	u32 reg;
> +
> +	/* clear PHY_DEFAULT_POWER_STATE */
> +	p = port_ctrl + SATA_TOP_CTRL_PHY_CTRL_1;
> +	reg = readl(p);
> +	reg &= ~SATA_TOP_CTRL_1_PHY_DEFAULT_POWER_STATE;
> +	writel(reg, p);
> +
> +	/* reset the PHY digital logic */
> +	p = port_ctrl + SATA_TOP_CTRL_PHY_CTRL_2;
> +	reg = readl(p);
> +	reg &= ~(SATA_TOP_CTRL_2_SW_RST_MDIOREG | SATA_TOP_CTRL_2_SW_RST_OOB |
> +		 SATA_TOP_CTRL_2_SW_RST_RX);
> +	reg |= SATA_TOP_CTRL_2_SW_RST_TX;
> +	writel(reg, p);
> +	reg = readl(p);
> +	reg |= SATA_TOP_CTRL_2_PHY_GLOBAL_RESET;
> +	writel(reg, p);
> +	reg = readl(p);
> +	reg &= ~SATA_TOP_CTRL_2_PHY_GLOBAL_RESET;
> +	writel(reg, p);
> +	(void)readl(p);
> +}
> +
> +static void brcm_sata_phy_disable(struct brcm_sata_port *port)
> +{
> +	void __iomem *port_ctrl = sata_phy_get_port_ctrl(port);
> +	void __iomem *p;
> +	u32 reg;
> +
> +	/* power-off the PHY digital logic */
> +	p = port_ctrl + SATA_TOP_CTRL_PHY_CTRL_2;
> +	reg = readl(p);
> +	reg |= (SATA_TOP_CTRL_2_SW_RST_MDIOREG | SATA_TOP_CTRL_2_SW_RST_OOB |
> +		SATA_TOP_CTRL_2_SW_RST_RX | SATA_TOP_CTRL_2_SW_RST_TX |
> +		SATA_TOP_CTRL_2_PHY_GLOBAL_RESET);
> +	writel(reg, p);
> +
> +	/* set PHY_DEFAULT_POWER_STATE */
> +	p = port_ctrl + SATA_TOP_CTRL_PHY_CTRL_1;
> +	reg = readl(p);
> +	reg |= SATA_TOP_CTRL_1_PHY_DEFAULT_POWER_STATE;
> +	writel(reg, p);
> +}
> +
> +static int brcmstb_sata_phy_power_on(struct phy *phy)
> +{
> +	struct brcm_sata_port *port = phy_get_drvdata(phy);
> +
> +	dev_info(port->phy_priv->dev, "powering on port %d\n", port->portnum);

dev_dbg?
> +
> +	brcm_sata_phy_enable(port);
> +	cfg_ssc_28nm(port);
> +
> +	return 0;
> +}
> +
> +static int brcmstb_sata_phy_power_off(struct phy *phy)
> +{
> +	struct brcm_sata_port *port = phy_get_drvdata(phy);
> +
> +	dev_info(port->phy_priv->dev, "powering off port %d\n", port->portnum);

same here..
> +
> +	brcm_sata_phy_disable(port);
> +
> +	return 0;
> +}
> +
> +static struct phy_ops phy_ops_28nm = {
> +	.power_on	= brcmstb_sata_phy_power_on,
> +	.power_off	= brcmstb_sata_phy_power_off,
> +	.owner		= THIS_MODULE,
> +};
> +
> +static struct phy *brcm_sata_phy_xlate(struct device *dev,
> +				       struct of_phandle_args *args)
> +{
> +	struct brcm_sata_phy *priv = dev_get_drvdata(dev);
> +	int i = args->args[0];
> +
> +	if (i >= MAX_PORTS || !priv->phys[i].phy) {
> +		dev_err(dev, "invalid phy: %d\n", i);
> +		return ERR_PTR(-ENODEV);
> +	}
> +
> +	return priv->phys[i].phy;
> +}

this xlate is not required at all if the controller device tree node has
phandle to the phy node (sub node) instead of the phy provider device tree
node.
> +
> +static const struct of_device_id brcmstb_sata_phy_of_match[] = {
> +	{ .compatible	= "brcm,bcm7445-sata-phy" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, brcmstb_sata_phy_of_match);
> +
> +static int brcmstb_sata_phy_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *dn = dev->of_node, *child;
> +	struct brcm_sata_phy *priv;
> +	struct resource *res;
> +	struct phy_provider *provider;
> +	int count = 0;
> +
> +	if (of_get_child_count(dn) == 0)
> +		return -ENODEV;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +	dev_set_drvdata(dev, priv);
> +	priv->dev = dev;
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "port-ctrl");
> +	if (!res) {
> +		dev_err(dev, "couldn't get port-ctrl resource\n");
> +		return -EINVAL;
> +	}
> +	/*
> +	 * Don't request region, since it may be within a region owned by the
> +	 * SATA driver

It should be in the SATA driver then. Why is it here?
> +	 */
> +	priv->port_ctrl = devm_ioremap(dev, res->start, resource_size(res));
> +	if (!priv->port_ctrl) {
> +		dev_err(dev, "couldn't remap: %pR\n", res);
> +		return -ENOMEM;
> +	}
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy");
> +	priv->phy_base = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(priv->phy_base))
> +		return PTR_ERR(priv->phy_base);
> +
> +	for_each_available_child_of_node(dn, child) {
> +		unsigned int id;
> +		struct brcm_sata_port *port;
> +
> +		if (of_property_read_u32(child, "reg", &id)) {
> +			dev_err(dev, "missing reg property in node %s\n",
> +					child->name);
> +			return -EINVAL;
> +		}
> +
> +		if (id >= MAX_PORTS) {
> +			dev_err(dev, "invalid reg: %u\n", id);
> +			return -EINVAL;
> +		}
> +		if (priv->phys[id].phy) {
> +			dev_err(dev, "already registered port %u\n", id);
> +			return -EINVAL;
> +		}
> +
> +		port = &priv->phys[id];
> +		port->portnum = id;
> +		port->phy_priv = priv;
> +		port->phy = devm_phy_create(dev, NULL, &phy_ops_28nm);
> +		port->ssc_en = of_property_read_bool(child, "brcm,enable-ssc");
> +		if (IS_ERR(port->phy)) {
> +			dev_err(dev, "failed to create PHY\n");
> +			return PTR_ERR(port->phy);
> +		}
> +
> +		phy_set_drvdata(port->phy, port);
> +		count++;
> +	}
> +
> +	provider = devm_of_phy_provider_register(dev, brcm_sata_phy_xlate);
> +	if (IS_ERR(provider)) {
> +		dev_err(dev, "could not register PHY provider\n");
> +		return PTR_ERR(provider);
> +	}
> +
> +	dev_info(dev, "registered %d ports\n", count);

lets not make the boot noisy. Make it dev_vdbg if it is required.
> +
> +	return 0;
> +}
> +
> +static int brcmstb_sata_phy_remove(struct platform_device *pdev)
> +{
> +	return 0;
> +}

Remove this function if it doesn't have anything to do.

Thanks
Kishon
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