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Date: Wed, 2 Jul 2014 14:37:48 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Murali Karicheri <m-karicheri2@...com>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <linux-pci@...r.kernel.org>, 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>,
Grant Likely <grant.likely@...aro.org>
Subject: Re: [RESEND: PATCH - v3] phy: Add serdes phy driver for keystone
Hi,
On Tuesday 01 July 2014 07:27 PM, Murali Karicheri wrote:
> This phy driver added to support keystone PCI driver. This is
%s/PCI/PCIe/
> a generic phy driver and currently it supports only SerDes
> for PCI Controller. The hw vendor that provides the phy
The driver supports only for PCIe or the controller?
> hw published only registers and their values. So this driver
> uses these hard coded values to initialize the phy.
>
> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
> CC: Rob Herring <robh+dt@...nel.org>
> CC: Pawel Moll <pawel.moll@....com>
> CC: Mark Rutland <mark.rutland@....com>
> CC: Ian Campbell <ijc+devicetree@...lion.org.uk>
> CC: Kumar Gala <galak@...eaurora.org>
> CC: Kishon Vijay Abraham I <kishon@...com>
> CC: Grant Likely <grant.likely@...aro.org>
> ---
> Changelog:-
> - Resending with changelog moved out of commit message
> - Added comments to indicate what the register functionality
> each register blob is doing.
> - Previous versions were part of the PCI Keystone driver series.
> This is now send as a separate patch so that this can be
> reviewed indepedently and merged.
>
> .../bindings/phy/phy-serdes-keystone.txt | 25 +++
> drivers/phy/Kconfig | 6 +
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-serdes-keystone.c | 200 ++++++++++++++++++++
> 4 files changed, 232 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/phy/phy-serdes-keystone.txt
> create mode 100644 drivers/phy/phy-serdes-keystone.c
>
> diff --git a/Documentation/devicetree/bindings/phy/phy-serdes-keystone.txt b/Documentation/devicetree/bindings/phy/phy-serdes-keystone.txt
Can we reuse ti-phy.txt for this?
> new file mode 100644
> index 0000000..612c7b5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/phy-serdes-keystone.txt
> @@ -0,0 +1,25 @@
> +TI Keystone SerDes Phy: DT documentation
> +=======================================
> +
> +Required properties:
> + - compatible: should be "ti,keystone-serdes-phy";
> + - reg: base address and length of the SerDes register set
> + - reg-names: should be "reg_serdes", name of the reg SerDes register set
> + - #phy-cells: from the generic phy bindings, must be 0;
> +
> +Exampel for Keystone PCIE,
> +
> + pcie0_phy: serdes_phy@...0000 {
> + #phy-cells = <0>;
> + compatible = "ti,keystone-serdes-phy";
> + reg = <0x02320000 0x4000>;
> + reg-names = "reg_serdes";
> + };
> +
> +
> +Then the PHY can be used in PCIe controller node as
> +
> +pcie@...00000 {
> + phys = <&pcie0_phy>;
> + phy-names = "pcie-phy";
> +};
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 16a2f06..54a8471 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -178,4 +178,10 @@ config PHY_XGENE
> help
> This option enables support for APM X-Gene SoC multi-purpose PHY.
>
> +config PHY_TI_KEYSTONE_SERDES
> + bool "TI Keystone SerDes PHY support"
> + depends on ARCH_KEYSTONE
depends on HAS_IOMEM?
> + select GENERIC_PHY
> + help
> + This option enables support for TI Keystone SerDes PHY.
> endmenu
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index b4f1d57..a02faaa 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -20,3 +20,4 @@ phy-exynos-usb2-$(CONFIG_PHY_EXYNOS4X12_USB2) += phy-exynos4x12-usb2.o
> phy-exynos-usb2-$(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_TI_KEYSTONE_SERDES) += phy-serdes-keystone.o
> diff --git a/drivers/phy/phy-serdes-keystone.c b/drivers/phy/phy-serdes-keystone.c
> new file mode 100644
> index 0000000..f1a8888
> --- /dev/null
> +++ b/drivers/phy/phy-serdes-keystone.c
Looking at the other phy drivers, feel this should be named phy-keystone-serdes.c?
> @@ -0,0 +1,200 @@
> +/*
> + * Keystone SerDes Phy driver
> + *
> + * Copyright (C) 2013-2014 Texas Instruments, Inc.
> + * http://www.ti.com
> + *
> + * Author: Murali Karicheri <m-karicheri2@...com>
> + *
> + * 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.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +
> +#define reg_dump(addr, mask) \
> + pr_debug("reg %p has value %x\n", (void *)addr, \
> + (readl(addr) & ~mask))
> +
> +/* mask bits point to bits being modified */
> +#define reg_rmw(addr, value, mask) \
> + writel(((readl(addr) & (~(mask))) | \
> + (value & (mask))), (addr))
> +struct serdes_config {
struct ks_serdes_config?
> + u32 reg;
> + u32 val;
> + u32 mask;
> +};
> +
> +struct phy_serdes_keystone {
struct ks_serdes_phy?
> + struct device *dev;
> + void __iomem *base;
> +};
> +
> +static struct serdes_config ks_100mhz_5gbps_serdes[] = {
> + /* SerDes Clock and common configuration */
> + {0x0000, 0x00000800, 0x0000ff00},
> + {0x0060, 0x00041c5c, 0x00ffffff},
> + {0x0064, 0x0343c700, 0xffffff00},
> + {0x006c, 0x00000012, 0x000000ff},
> + {0x0068, 0x00070000, 0x00ff0000},
> + {0x0078, 0x0000c000, 0x0000ff00},
> +
> + /* Lane - A Phy configuration */
> + {0x0200, 0x00000000, 0x000000ff},
> + {0x0204, 0x5e000080, 0xff0000ff},
> + {0x0208, 0x00000006, 0x000000ff},
> + {0x0210, 0x00000023, 0x000000ff},
> + {0x0214, 0x2e003060, 0xff00ffff},
> + {0x0218, 0x76000000, 0xff000000},
> + {0x022c, 0x00200002, 0x00ff00ff},
> + {0x02a0, 0xffee0000, 0xffff0000},
> + {0x02a4, 0x0000000f, 0x000000ff},
> + {0x0204, 0x5e000000, 0xff000000},
> + {0x0208, 0x00000006, 0x000000ff},
> + {0x0278, 0x00002000, 0x0000ff00},
> + {0x0280, 0x00280028, 0x00ff00ff},
> + {0x0284, 0x2d0f0385, 0xffffffff},
> + {0x0250, 0xd0000000, 0xff000000},
> + {0x0284, 0x00000085, 0x000000ff},
> + {0x0294, 0x20000000, 0xff000000},
> +
> + /* Lane - B Phy configuration */
> + {0x0400, 0x00000000, 0x000000ff},
> + {0x0404, 0x5e000080, 0xff0000ff},
> + {0x0408, 0x00000006, 0x000000ff},
> + {0x0410, 0x00000023, 0x000000ff},
> + {0x0414, 0x2e003060, 0xff00ffff},
> + {0x0418, 0x76000000, 0xff000000},
> + {0x042c, 0x00200002, 0x00ff00ff},
> + {0x04a0, 0xffee0000, 0xffff0000},
> + {0x04a4, 0x0000000f, 0x000000ff},
> + {0x0404, 0x5e000000, 0xff000000},
> + {0x0408, 0x00000006, 0x000000ff},
> + {0x0478, 0x00002000, 0x0000ff00},
> + {0x0480, 0x00280028, 0x00ff00ff},
> + {0x0484, 0x2d0f0385, 0xffffffff},
> + {0x0450, 0xd0000000, 0xff000000},
> + {0x0494, 0x20000000, 0xff000000},
> +
> + /* Common Lane configurations */
> + {0x0a00, 0x00000100, 0x0000ff00},
> + {0x0a08, 0x00e12c08, 0x00ffffff},
> + {0x0a0c, 0x00000081, 0x000000ff},
> + {0x0a18, 0x00e80000, 0x00ff0000},
> + {0x0a30, 0x002f2f00, 0x00ffff00},
> + {0x0a4c, 0xac820000, 0xffff0000},
> + {0x0a54, 0xc0000000, 0xff000000},
> + {0x0a58, 0x00001441, 0x0000ffff},
> + {0x0a84, 0x00000301, 0x0000ffff},
> + {0x0a8c, 0x81030000, 0xffff0000},
> + {0x0a90, 0x00006001, 0x0000ffff},
> + {0x0a94, 0x01000000, 0xff000000},
> + {0x0aa0, 0x81000000, 0xff000000},
> + {0x0abc, 0xff000000, 0xff000000},
> + {0x0ac0, 0x0000008b, 0x000000ff},
> +
> + /* common clock configuration */
> + {0x0000, 0x00000003, 0x000000ff},
> +
> + /* Common Lane configurations */
> + {0x0a00, 0x0000009f, 0x000000ff},
> + {0x0a44, 0x5f733d00, 0xffffff00},
> + {0x0a48, 0x00fdca00, 0x00ffff00},
> + {0x0a5c, 0x00000000, 0xffff0000},
> + {0x0a60, 0x00008000, 0xffffffff},
> + {0x0a64, 0x0c581220, 0xffffffff},
> + {0x0a68, 0xe13b0602, 0xffffffff},
> + {0x0a6c, 0xb8074cc1, 0xffffffff},
> + {0x0a70, 0x3f02e989, 0xffffffff},
> + {0x0a74, 0x00000001, 0x000000ff},
> + {0x0b14, 0x00370000, 0x00ff0000},
> + {0x0b10, 0x37000000, 0xff000000},
> + {0x0b14, 0x0000005d, 0x000000ff},
I'm not particularly happy about merging this sort of configuration :-/
> +};
> +
> +static int ks_serdes_phy_init(struct phy *phy)
> +{
> + struct serdes_config *p;
> + struct phy_serdes_keystone *ks_phy = phy_get_drvdata(phy);
> +
> + int i;
> +
> + for (i = 0, p = &ks_100mhz_5gbps_serdes[0];
> + i < ARRAY_SIZE(ks_100mhz_5gbps_serdes);
> + i++, p++) {
> + reg_rmw((ks_phy->base + p->reg), p->val, p->mask);
> + reg_dump((ks_phy->base + p->reg), p->mask);
> + }
> + msleep(20);
Why this delay is needed? A small comment would help.
> +
> + return 0;
> +}
> +
> +static struct phy_ops ks_serdes_phy_ops = {
> + .init = ks_serdes_phy_init,
> + .owner = THIS_MODULE,
> +};
> +
> +static int ks_serdes_phy_probe(struct platform_device *pdev)
> +{
> + struct phy_provider *phy_provider;
> + struct device *dev = &pdev->dev;
> + struct phy_serdes_keystone *ks_phy;
> + struct phy *phy;
> + struct resource *res;
> +
> + ks_phy = devm_kzalloc(dev, sizeof(*ks_phy), GFP_KERNEL);
> + if (!ks_phy)
> + return -ENOMEM;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "reg_serdes");
> + ks_phy->base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(ks_phy->base))
> + return PTR_ERR(ks_phy->base);
> +
> + ks_phy->dev = dev;
> + phy = devm_phy_create(dev, &ks_serdes_phy_ops, NULL);
> + if (IS_ERR(phy))
> + return PTR_ERR(phy);
> +
> + phy_set_drvdata(phy, ks_phy);
> + phy_provider = devm_of_phy_provider_register(ks_phy->dev,
> + of_phy_simple_xlate);
> +
> + if (IS_ERR(phy_provider))
> + return PTR_ERR(phy_provider);
> +
> + dev_info(dev, "keystone SerDes Phy initialized\n");
Lets not make the boot noisy, remove this.
> + return 0;
> +}
> +
> +static const struct of_device_id ks_serdes_phy_of_match[] = {
> + { .compatible = "ti,keystone-serdes-phy" },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, ks_serdes_phy_of_match);
> +
> +static struct platform_driver ks_serdes_phy_driver = {
> + .probe = ks_serdes_phy_probe,
> + .driver = {
> + .of_match_table = ks_serdes_phy_of_match,
> + .name = "ti,keystone-serdes-phy",
> + .owner = THIS_MODULE,
> + }
> +};
> +module_platform_driver(ks_serdes_phy_driver);
> +
> +MODULE_DESCRIPTION("TI Keystone SerDes PHY driver");
> +MODULE_LICENSE("GPL V2");
It's *GPL v2*
Cheers
Kishon
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