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Date: Thu, 21 May 2015 18:15:56 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Rob Herring <robh@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alan Stern <stern@...land.harvard.edu>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-usb@...r.kernel.org>
Subject: Re: [PATCH 4/5] phy: add Marvell HSIC 28nm PHY
Hi,
On Thursday 14 May 2015 04:18 AM, Rob Herring wrote:
> Add PHY driver for the Marvell HSIC 28nm PHY. This PHY is found in PXA1928
> SOC.
>
> Signed-off-by: Rob Herring <robh@...nel.org>
> Cc: Kishon Vijay Abraham I <kishon@...com>
> ---
> drivers/phy/Kconfig | 10 +++
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-mv-hsic.c | 208 ++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 219 insertions(+)
> create mode 100644 drivers/phy/phy-mv-hsic.c
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index ef7634f..cfcae72 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -52,6 +52,16 @@ config PHY_EXYNOS_MIPI_VIDEO
> Support for MIPI CSI-2 and MIPI DSI DPHY found on Samsung S5P
> and EXYNOS SoCs.
>
> +config PHY_MV_HSIC
> + tristate "Marvell USB HSIC 28nm PHY Driver"
> + select GENERIC_PHY
> + help
> + Enable this to support Marvell USB HSIC PHY driver for Marvell
> + SoC. This driver will do the PHY initialization and shutdown.
> + The PHY driver will be used by Marvell ehci driver.
> +
> + To compile this driver as a module, choose M here.
> +
> config PHY_MV_USB2
> tristate "Marvell USB 2.0 28nm PHY Driver"
> select GENERIC_PHY
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 768e55a..472bf0a 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -10,6 +10,7 @@ obj-$(CONFIG_ARMADA375_USBCLUSTER_PHY) += phy-armada375-usb2.o
> obj-$(CONFIG_BCM_KONA_USB2_PHY) += phy-bcm-kona-usb2.o
> obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o
> obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o
> +obj-$(CONFIG_PHY_MV_HSIC) += phy-mv-hsic.o
> obj-$(CONFIG_PHY_MV_USB2) += phy-mv-usb2.o
> obj-$(CONFIG_PHY_MVEBU_SATA) += phy-mvebu-sata.o
> obj-$(CONFIG_PHY_MIPHY28LP) += phy-miphy28lp.o
> diff --git a/drivers/phy/phy-mv-hsic.c b/drivers/phy/phy-mv-hsic.c
> new file mode 100644
> index 0000000..aa6cccd
> --- /dev/null
> +++ b/drivers/phy/phy-mv-hsic.c
> @@ -0,0 +1,208 @@
> +/*
> + * Copyright (C) 2015 Linaro, Ltd.
> + * Rob Herring <robh@...nel.org>
> + *
> + * Based on vendor driver:
> + * Copyright (C) 2013 Marvell Inc.
> + * Author: Chao Xie <xiechao.mail@...il.com>
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * 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/delay.h>
> +#include <linux/slab.h>
> +#include <linux/of.h>
> +#include <linux/io.h>
> +#include <linux/err.h>
> +#include <linux/clk.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/phy/phy.h>
> +
> +#define PHY_28NM_HSIC_CTRL 0x08
> +#define PHY_28NM_HSIC_IMPCAL_CAL 0x18
> +#define PHY_28NM_HSIC_PLL_CTRL01 0x1c
> +#define PHY_28NM_HSIC_PLL_CTRL2 0x20
> +#define PHY_28NM_HSIC_INT 0x28
> +
> +#define PHY_28NM_HSIC_PLL_SELLPFR_SHIFT 26
> +#define PHY_28NM_HSIC_PLL_FBDIV_SHIFT 0
> +#define PHY_28NM_HSIC_PLL_REFDIV_SHIFT 9
> +
> +#define PHY_28NM_HSIC_S2H_PU_PLL BIT(10)
> +#define PHY_28NM_HSIC_H2S_PLL_LOCK BIT(15)
> +#define PHY_28NM_HSIC_S2H_HSIC_EN BIT(7)
> +#define S2H_DRV_SE0_4RESUME BIT(14)
> +#define PHY_28NM_HSIC_H2S_IMPCAL_DONE BIT(27)
> +
> +#define PHY_28NM_HSIC_CONNECT_INT BIT(1)
> +#define PHY_28NM_HSIC_HS_READY_INT BIT(2)
> +
> +struct mv_hsic_phy {
> + struct phy *phy;
> + struct platform_device *pdev;
> + void __iomem *base;
> + struct clk *clk;
> +};
> +
> +static bool wait_for_reg(void __iomem *reg, u32 mask, unsigned long timeout)
> +{
> + timeout += jiffies;
> + while (time_is_after_eq_jiffies(timeout)) {
> + if ((readl(reg) & mask) == mask)
> + return true;
> + msleep(1);
> + }
> + return false;
> +}
> +
> +static int mv_hsic_phy_init(struct phy *phy)
> +{
> + struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy);
> + struct platform_device *pdev = mv_phy->pdev;
> + void __iomem *base = mv_phy->base;
> +
> + clk_prepare_enable(mv_phy->clk);
> +
> + /* Set reference clock */
> + writel(0x1 << PHY_28NM_HSIC_PLL_SELLPFR_SHIFT |
> + 0xf0 << PHY_28NM_HSIC_PLL_FBDIV_SHIFT |
> + 0xd << PHY_28NM_HSIC_PLL_REFDIV_SHIFT,
> + base + PHY_28NM_HSIC_PLL_CTRL01);
> +
> + /* Turn on PLL */
> + writel(readl(base + PHY_28NM_HSIC_PLL_CTRL2) |
> + PHY_28NM_HSIC_S2H_PU_PLL,
> + base + PHY_28NM_HSIC_PLL_CTRL2);
> +
> + /* Make sure PHY PLL is locked */
> + if (!wait_for_reg(base + PHY_28NM_HSIC_PLL_CTRL2,
> + PHY_28NM_HSIC_H2S_PLL_LOCK, HZ / 10)) {
> + dev_err(&pdev->dev, "HSIC PHY PLL not locked after 100mS.");
> + return -ETIMEDOUT;
> + }
> +
> + /* Avoid SE0 state when resume for some device will take it as reset */
> + writel(readl(base + PHY_28NM_HSIC_CTRL) & ~S2H_DRV_SE0_4RESUME,
> + base + PHY_28NM_HSIC_CTRL);
> +
> + /* Enable HSIC PHY */
> + writel(readl(base + PHY_28NM_HSIC_CTRL) | PHY_28NM_HSIC_S2H_HSIC_EN,
> + base + PHY_28NM_HSIC_CTRL);
> +
> + /* Calibration Timing
> + * ____________________________
> + * CAL START ___|
> + * ____________________
> + * CAL_DONE ___________|
> + * | 400us |
> + */
Please use the comment style used here
http://lxr.free-electrons.com/source/Documentation/CodingStyle#L464
> +
> + /* Make sure PHY Calibration is ready */
> + if (!wait_for_reg(base + PHY_28NM_HSIC_IMPCAL_CAL,
> + PHY_28NM_HSIC_H2S_IMPCAL_DONE, HZ / 10)) {
> + dev_warn(&pdev->dev, "HSIC PHY READY not set after 100mS.");
> + return -ETIMEDOUT;
> + }
> +
> + /* Waiting for HSIC connect int*/
> + if (!wait_for_reg(base + PHY_28NM_HSIC_INT,
> + PHY_28NM_HSIC_CONNECT_INT, HZ / 5)) {
> + dev_warn(&pdev->dev, "HSIC wait for connect interrupt timeout.");
> + return -ETIMEDOUT;
> + }
> +
> + return 0;
> +}
> +
> +static int mv_hsic_phy_power_on(struct phy *phy)
> +{
> + struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy);
> + struct platform_device *pdev = mv_phy->pdev;
> +
> + /* check HS ready */
> + if (!wait_for_reg(mv_phy->base + PHY_28NM_HSIC_INT,
> + PHY_28NM_HSIC_HS_READY_INT, HZ / 10)) {
> + dev_err(&pdev->dev, "HSIC HS_READY not set\n");
> + return -ETIMEDOUT;
> + }
> + return 0;
> +}
> +
> +static int mv_hsic_phy_power_off(struct phy *phy)
> +{
> + struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy);
> + void __iomem *base = mv_phy->base;
> +
> + writel(readl(base + PHY_28NM_HSIC_CTRL) & ~PHY_28NM_HSIC_S2H_HSIC_EN,
> + base + PHY_28NM_HSIC_CTRL);
> +
> + clk_disable_unprepare(mv_phy->clk);
> + return 0;
> +}
> +
> +static const struct phy_ops hsic_ops = {
> + .init = mv_hsic_phy_init,
> + .power_on = mv_hsic_phy_power_on,
> + .power_off = mv_hsic_phy_power_off,
exit callback is missing? Shouldn't we turn off the PLLs in exit callback?
Thanks
Kishon
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