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Date: Wed, 16 Jul 2014 10:40:50 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Kumar Gala <galak@...eaurora.org>
CC: <linux-ide@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<sboyd@...eaurora.org>, <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v7 1/2] phy: qcom: Add driver for QCOM IPQ806x SATA PHY
Hi,
On Tuesday 15 July 2014 10:09 PM, Kumar Gala wrote:
> Add a PHY driver for uses with AHCI based SATA controller driver on the
> IPQ806x family of SoCs.
>
> Signed-off-by: Kumar Gala <galak@...eaurora.org>
Please fix this checkpatch warning..
WARNING: memory barrier without comment
#235: FILE: drivers/phy/phy-qcom-ipq806x-sata.c:101:
+ mb();
total: 0 errors, 1 warnings, 223 lines checked
-Kishon
> ---
> v7:
> * Fix compilation issues due to change in devm_phy_create API
>
> v6:
> * Add platform_set_drvdata
>
> v5:
> * Fix copy/paste error when killing qcom_ipq806x_sata_delay_us
>
> v4:
> * removed qcom_ipq806x_sata_delay_us as it was only used one
>
> v3:
> * Added Kconfig HAS_IOMEM dep
> * re-ordered probe function so phy_provider_register is last
>
> v2:
> * dropped unused dev pointer in struct qcom_ipq806x_sata_phy
> * remove unnecessary reg initializaiton
> * Removed unneeded error message
> * Added remove function to disable the clock
>
> drivers/phy/Kconfig | 7 ++
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-qcom-ipq806x-sata.c | 208 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 216 insertions(+)
> create mode 100644 drivers/phy/phy-qcom-ipq806x-sata.c
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 1704fd4..3e251aa 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -191,4 +191,11 @@ config PHY_QCOM_APQ8064_SATA
> depends on OF
> select GENERIC_PHY
>
> +config PHY_QCOM_IPQ806X_SATA
> + tristate "Qualcomm IPQ806x SATA SerDes/PHY driver"
> + depends on ARCH_QCOM
> + depends on HAS_IOMEM
> + depends on OF
> + select GENERIC_PHY
> +
> endmenu
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 3c2ad59..54ab978 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -23,3 +23,4 @@ phy-exynos-usb2-$(CONFIG_PHY_EXYNOS5250_USB2) += phy-exynos5250-usb2.o
> obj-$(CONFIG_PHY_EXYNOS5_USBDRD) += phy-exynos5-usbdrd.o
> obj-$(CONFIG_PHY_XGENE) += phy-xgene.o
> obj-$(CONFIG_PHY_QCOM_APQ8064_SATA) += phy-qcom-apq8064-sata.o
> +obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA) += phy-qcom-ipq806x-sata.o
> diff --git a/drivers/phy/phy-qcom-ipq806x-sata.c b/drivers/phy/phy-qcom-ipq806x-sata.c
> new file mode 100644
> index 0000000..2199627
> --- /dev/null
> +++ b/drivers/phy/phy-qcom-ipq806x-sata.c
> @@ -0,0 +1,208 @@
> +/*
> + * Copyright (c) 2014, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * 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/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/time.h>
> +#include <linux/delay.h>
> +#include <linux/clk.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +#include <linux/phy/phy.h>
> +
> +struct qcom_ipq806x_sata_phy {
> + void __iomem *mmio;
> + struct clk *cfg_clk;
> + struct device *dev;
> +};
> +
> +#define __set(v, a, b) (((v) << (b)) & GENMASK(a, b))
> +
> +#define SATA_PHY_P0_PARAM0 0x200
> +#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN3(x) __set(x, 17, 12)
> +#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN3_MASK GENMASK(17, 12)
> +#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN2(x) __set(x, 11, 6)
> +#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN2_MASK GENMASK(11, 6)
> +#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN1(x) __set(x, 5, 0)
> +#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN1_MASK GENMASK(5, 0)
> +
> +#define SATA_PHY_P0_PARAM1 0x204
> +#define SATA_PHY_P0_PARAM1_RESERVED_BITS31_21(x) __set(x, 31, 21)
> +#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN3(x) __set(x, 20, 14)
> +#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN3_MASK GENMASK(20, 14)
> +#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN2(x) __set(x, 13, 7)
> +#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN2_MASK GENMASK(13, 7)
> +#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN1(x) __set(x, 6, 0)
> +#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN1_MASK GENMASK(6, 0)
> +
> +#define SATA_PHY_P0_PARAM2 0x208
> +#define SATA_PHY_P0_PARAM2_RX_EQ(x) __set(x, 20, 18)
> +#define SATA_PHY_P0_PARAM2_RX_EQ_MASK GENMASK(20, 18)
> +
> +#define SATA_PHY_P0_PARAM3 0x20C
> +#define SATA_PHY_SSC_EN 0x8
> +#define SATA_PHY_P0_PARAM4 0x210
> +#define SATA_PHY_REF_SSP_EN 0x2
> +#define SATA_PHY_RESET 0x1
> +
> +static int qcom_ipq806x_sata_phy_init(struct phy *generic_phy)
> +{
> + struct qcom_ipq806x_sata_phy *phy = phy_get_drvdata(generic_phy);
> + u32 reg;
> +
> + /* Setting SSC_EN to 1 */
> + reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM3);
> + reg = reg | SATA_PHY_SSC_EN;
> + writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM3);
> +
> + reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM0) &
> + ~(SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN3_MASK |
> + SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN2_MASK |
> + SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN1_MASK);
> + reg |= SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN3(0xf);
> + writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM0);
> +
> + reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM1) &
> + ~(SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN3_MASK |
> + SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN2_MASK |
> + SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN1_MASK);
> + reg |= SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN3(0x55) |
> + SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN2(0x55) |
> + SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN1(0x55);
> + writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM1);
> +
> + reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM2) &
> + ~SATA_PHY_P0_PARAM2_RX_EQ_MASK;
> + reg |= SATA_PHY_P0_PARAM2_RX_EQ(0x3);
> + writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM2);
> +
> + /* Setting PHY_RESET to 1 */
> + reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM4);
> + reg = reg | SATA_PHY_RESET;
> + writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM4);
> +
> + /* Setting REF_SSP_EN to 1 */
> + reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM4);
> + reg = reg | SATA_PHY_REF_SSP_EN | SATA_PHY_RESET;
> + writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM4);
> + mb();
> + /* sleep for max. 50us more to combine processor wakeups */
> + usleep_range(20, 20 + 50);
> +
> + /* Clearing PHY_RESET to 0 */
> + reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM4);
> + reg = reg & ~SATA_PHY_RESET;
> + writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM4);
> +
> + return 0;
> +}
> +
> +static int qcom_ipq806x_sata_phy_exit(struct phy *generic_phy)
> +{
> + struct qcom_ipq806x_sata_phy *phy = phy_get_drvdata(generic_phy);
> + u32 reg;
> +
> + /* Setting PHY_RESET to 1 */
> + reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM4);
> + reg = reg | SATA_PHY_RESET;
> + writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM4);
> +
> + return 0;
> +}
> +
> +static struct phy_ops qcom_ipq806x_sata_phy_ops = {
> + .init = qcom_ipq806x_sata_phy_init,
> + .exit = qcom_ipq806x_sata_phy_exit,
> + .owner = THIS_MODULE,
> +};
> +
> +static int qcom_ipq806x_sata_phy_probe(struct platform_device *pdev)
> +{
> + struct qcom_ipq806x_sata_phy *phy;
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + struct phy_provider *phy_provider;
> + struct phy *generic_phy;
> + int ret;
> +
> + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> + if (!phy)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + phy->mmio = devm_ioremap_resource(dev, res);
> + if (IS_ERR(phy->mmio))
> + return PTR_ERR(phy->mmio);
> +
> + generic_phy = devm_phy_create(dev, NULL, &qcom_ipq806x_sata_phy_ops,
> + NULL);
> + if (IS_ERR(generic_phy)) {
> + dev_err(dev, "%s: failed to create phy\n", __func__);
> + return PTR_ERR(generic_phy);
> + }
> +
> + phy->dev = dev;
> + phy_set_drvdata(generic_phy, phy);
> + platform_set_drvdata(pdev, phy);
> +
> + phy->cfg_clk = devm_clk_get(dev, "cfg");
> + if (IS_ERR(phy->cfg_clk)) {
> + dev_err(dev, "Failed to get sata cfg clock\n");
> + return PTR_ERR(phy->cfg_clk);
> + }
> +
> + ret = clk_prepare_enable(phy->cfg_clk);
> + if (ret)
> + return ret;
> +
> + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> + if (IS_ERR(phy_provider)) {
> + clk_disable_unprepare(phy->cfg_clk);
> + dev_err(dev, "%s: failed to register phy\n", __func__);
> + return PTR_ERR(phy_provider);
> + }
> +
> + return 0;
> +}
> +
> +static int qcom_ipq806x_sata_phy_remove(struct platform_device *pdev)
> +{
> + struct qcom_ipq806x_sata_phy *phy = platform_get_drvdata(pdev);
> +
> + clk_disable_unprepare(phy->cfg_clk);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id qcom_ipq806x_sata_phy_of_match[] = {
> + { .compatible = "qcom,ipq806x-sata-phy" },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, qcom_ipq806x_sata_phy_of_match);
> +
> +static struct platform_driver qcom_ipq806x_sata_phy_driver = {
> + .probe = qcom_ipq806x_sata_phy_probe,
> + .remove = qcom_ipq806x_sata_phy_remove,
> + .driver = {
> + .name = "qcom-ipq806x-sata-phy",
> + .owner = THIS_MODULE,
> + .of_match_table = qcom_ipq806x_sata_phy_of_match,
> + }
> +};
> +module_platform_driver(qcom_ipq806x_sata_phy_driver);
> +
> +MODULE_DESCRIPTION("QCOM IPQ806x SATA PHY driver");
> +MODULE_LICENSE("GPL v2");
>
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