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Message-ID: <f36abb62-e8a4-e69f-4732-95a0db466034@ti.com>
Date: Tue, 25 Sep 2018 10:53:49 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Lubomir Rintel <lkundrak@...sk>, <linux-kernel@...r.kernel.org>
CC: <linux-usb@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Eric Miao <eric.y.miao@...il.com>,
Haojian Zhuang <haojian.zhuang@...il.com>,
Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH 01/14] phy: phy-pxa-usb: add a new driver
On Thursday 23 August 2018 02:12 AM, Lubomir Rintel wrote:
> Turned from arch/arm/mach-mmp/devices.c into a proper PHY driver, so
> that in can be instantiated from a DT.
>
> Signed-off-by: Lubomir Rintel <lkundrak@...sk>
Acked-by: Kishon Vijay Abraham I <kishon@...com>
If this has to be merged via linux-phy tree, please let me know.
Thanks
Kishon
> ---
> drivers/phy/marvell/Kconfig | 11 +
> drivers/phy/marvell/Makefile | 1 +
> drivers/phy/marvell/phy-pxa-usb.c | 345 ++++++++++++++++++++++++++++++
> 3 files changed, 357 insertions(+)
> create mode 100644 drivers/phy/marvell/phy-pxa-usb.c
>
> diff --git a/drivers/phy/marvell/Kconfig b/drivers/phy/marvell/Kconfig
> index 68e321225400..6fb4b56e4c14 100644
> --- a/drivers/phy/marvell/Kconfig
> +++ b/drivers/phy/marvell/Kconfig
> @@ -59,3 +59,14 @@ config PHY_PXA_28NM_USB2
> The PHY driver will be used by Marvell udc/ehci/otg driver.
>
> To compile this driver as a module, choose M here.
> +
> +config PHY_PXA_USB
> + tristate "Marvell PXA USB PHY Driver"
> + depends on ARCH_PXA || ARCH_MMP
> + select GENERIC_PHY
> + help
> + Enable this to support Marvell PXA USB PHY driver for Marvell
> + SoC. This driver will do the PHY initialization and shutdown.
> + The PHY driver will be used by Marvell udc/ehci/otg driver.
> +
> + To compile this driver as a module, choose M here.
> diff --git a/drivers/phy/marvell/Makefile b/drivers/phy/marvell/Makefile
> index 5c3ec5d10e0d..3975b144f8ec 100644
> --- a/drivers/phy/marvell/Makefile
> +++ b/drivers/phy/marvell/Makefile
> @@ -6,3 +6,4 @@ obj-$(CONFIG_PHY_MVEBU_CP110_COMPHY) += phy-mvebu-cp110-comphy.o
> obj-$(CONFIG_PHY_MVEBU_SATA) += phy-mvebu-sata.o
> obj-$(CONFIG_PHY_PXA_28NM_HSIC) += phy-pxa-28nm-hsic.o
> obj-$(CONFIG_PHY_PXA_28NM_USB2) += phy-pxa-28nm-usb2.o
> +obj-$(CONFIG_PHY_PXA_USB) += phy-pxa-usb.o
> diff --git a/drivers/phy/marvell/phy-pxa-usb.c b/drivers/phy/marvell/phy-pxa-usb.c
> new file mode 100644
> index 000000000000..87ff7550b912
> --- /dev/null
> +++ b/drivers/phy/marvell/phy-pxa-usb.c
> @@ -0,0 +1,345 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
> + * Copyright (C) 2018 Lubomir Rintel <lkundrak@...sk>
> + */
> +
> +#include <dt-bindings/phy/phy.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +
> +/* phy regs */
> +#define UTMI_REVISION 0x0
> +#define UTMI_CTRL 0x4
> +#define UTMI_PLL 0x8
> +#define UTMI_TX 0xc
> +#define UTMI_RX 0x10
> +#define UTMI_IVREF 0x14
> +#define UTMI_T0 0x18
> +#define UTMI_T1 0x1c
> +#define UTMI_T2 0x20
> +#define UTMI_T3 0x24
> +#define UTMI_T4 0x28
> +#define UTMI_T5 0x2c
> +#define UTMI_RESERVE 0x30
> +#define UTMI_USB_INT 0x34
> +#define UTMI_DBG_CTL 0x38
> +#define UTMI_OTG_ADDON 0x3c
> +
> +/* For UTMICTRL Register */
> +#define UTMI_CTRL_USB_CLK_EN (1 << 31)
> +/* pxa168 */
> +#define UTMI_CTRL_SUSPEND_SET1 (1 << 30)
> +#define UTMI_CTRL_SUSPEND_SET2 (1 << 29)
> +#define UTMI_CTRL_RXBUF_PDWN (1 << 24)
> +#define UTMI_CTRL_TXBUF_PDWN (1 << 11)
> +
> +#define UTMI_CTRL_INPKT_DELAY_SHIFT 30
> +#define UTMI_CTRL_INPKT_DELAY_SOF_SHIFT 28
> +#define UTMI_CTRL_PU_REF_SHIFT 20
> +#define UTMI_CTRL_ARC_PULLDN_SHIFT 12
> +#define UTMI_CTRL_PLL_PWR_UP_SHIFT 1
> +#define UTMI_CTRL_PWR_UP_SHIFT 0
> +
> +/* For UTMI_PLL Register */
> +#define UTMI_PLL_PLLCALI12_SHIFT 29
> +#define UTMI_PLL_PLLCALI12_MASK (0x3 << 29)
> +
> +#define UTMI_PLL_PLLVDD18_SHIFT 27
> +#define UTMI_PLL_PLLVDD18_MASK (0x3 << 27)
> +
> +#define UTMI_PLL_PLLVDD12_SHIFT 25
> +#define UTMI_PLL_PLLVDD12_MASK (0x3 << 25)
> +
> +#define UTMI_PLL_CLK_BLK_EN_SHIFT 24
> +#define CLK_BLK_EN (0x1 << 24)
> +#define PLL_READY (0x1 << 23)
> +#define KVCO_EXT (0x1 << 22)
> +#define VCOCAL_START (0x1 << 21)
> +
> +#define UTMI_PLL_KVCO_SHIFT 15
> +#define UTMI_PLL_KVCO_MASK (0x7 << 15)
> +
> +#define UTMI_PLL_ICP_SHIFT 12
> +#define UTMI_PLL_ICP_MASK (0x7 << 12)
> +
> +#define UTMI_PLL_FBDIV_SHIFT 4
> +#define UTMI_PLL_FBDIV_MASK (0xFF << 4)
> +
> +#define UTMI_PLL_REFDIV_SHIFT 0
> +#define UTMI_PLL_REFDIV_MASK (0xF << 0)
> +
> +/* For UTMI_TX Register */
> +#define UTMI_TX_REG_EXT_FS_RCAL_SHIFT 27
> +#define UTMI_TX_REG_EXT_FS_RCAL_MASK (0xf << 27)
> +
> +#define UTMI_TX_REG_EXT_FS_RCAL_EN_SHIFT 26
> +#define UTMI_TX_REG_EXT_FS_RCAL_EN_MASK (0x1 << 26)
> +
> +#define UTMI_TX_TXVDD12_SHIFT 22
> +#define UTMI_TX_TXVDD12_MASK (0x3 << 22)
> +
> +#define UTMI_TX_CK60_PHSEL_SHIFT 17
> +#define UTMI_TX_CK60_PHSEL_MASK (0xf << 17)
> +
> +#define UTMI_TX_IMPCAL_VTH_SHIFT 14
> +#define UTMI_TX_IMPCAL_VTH_MASK (0x7 << 14)
> +
> +#define REG_RCAL_START (0x1 << 12)
> +
> +#define UTMI_TX_LOW_VDD_EN_SHIFT 11
> +
> +#define UTMI_TX_AMP_SHIFT 0
> +#define UTMI_TX_AMP_MASK (0x7 << 0)
> +
> +/* For UTMI_RX Register */
> +#define UTMI_REG_SQ_LENGTH_SHIFT 15
> +#define UTMI_REG_SQ_LENGTH_MASK (0x3 << 15)
> +
> +#define UTMI_RX_SQ_THRESH_SHIFT 4
> +#define UTMI_RX_SQ_THRESH_MASK (0xf << 4)
> +
> +#define UTMI_OTG_ADDON_OTG_ON (1 << 0)
> +
> +enum pxa_usb_phy_version {
> + PXA_USB_PHY_MMP2,
> + PXA_USB_PHY_PXA910,
> + PXA_USB_PHY_PXA168,
> +};
> +
> +struct pxa_usb_phy {
> + struct phy *phy;
> + void __iomem *base;
> + enum pxa_usb_phy_version version;
> +};
> +
> +/*****************************************************************************
> + * The registers read/write routines
> + *****************************************************************************/
> +
> +static unsigned int u2o_get(void __iomem *base, unsigned int offset)
> +{
> + return readl_relaxed(base + offset);
> +}
> +
> +static void u2o_set(void __iomem *base, unsigned int offset,
> + unsigned int value)
> +{
> + u32 reg;
> +
> + reg = readl_relaxed(base + offset);
> + reg |= value;
> + writel_relaxed(reg, base + offset);
> + readl_relaxed(base + offset);
> +}
> +
> +static void u2o_clear(void __iomem *base, unsigned int offset,
> + unsigned int value)
> +{
> + u32 reg;
> +
> + reg = readl_relaxed(base + offset);
> + reg &= ~value;
> + writel_relaxed(reg, base + offset);
> + readl_relaxed(base + offset);
> +}
> +
> +static void u2o_write(void __iomem *base, unsigned int offset,
> + unsigned int value)
> +{
> + writel_relaxed(value, base + offset);
> + readl_relaxed(base + offset);
> +}
> +
> +static int pxa_usb_phy_init(struct phy *phy)
> +{
> + struct pxa_usb_phy *pxa_usb_phy = phy_get_drvdata(phy);
> + void __iomem *base = pxa_usb_phy->base;
> + int loops;
> +
> + dev_info(&phy->dev, "initializing Marvell PXA USB PHY");
> +
> + /* Initialize the USB PHY power */
> + if (pxa_usb_phy->version == PXA_USB_PHY_PXA910) {
> + u2o_set(base, UTMI_CTRL, (1<<UTMI_CTRL_INPKT_DELAY_SOF_SHIFT)
> + | (1<<UTMI_CTRL_PU_REF_SHIFT));
> + }
> +
> + u2o_set(base, UTMI_CTRL, 1<<UTMI_CTRL_PLL_PWR_UP_SHIFT);
> + u2o_set(base, UTMI_CTRL, 1<<UTMI_CTRL_PWR_UP_SHIFT);
> +
> + /* UTMI_PLL settings */
> + u2o_clear(base, UTMI_PLL, UTMI_PLL_PLLVDD18_MASK
> + | UTMI_PLL_PLLVDD12_MASK | UTMI_PLL_PLLCALI12_MASK
> + | UTMI_PLL_FBDIV_MASK | UTMI_PLL_REFDIV_MASK
> + | UTMI_PLL_ICP_MASK | UTMI_PLL_KVCO_MASK);
> +
> + u2o_set(base, UTMI_PLL, 0xee<<UTMI_PLL_FBDIV_SHIFT
> + | 0xb<<UTMI_PLL_REFDIV_SHIFT | 3<<UTMI_PLL_PLLVDD18_SHIFT
> + | 3<<UTMI_PLL_PLLVDD12_SHIFT | 3<<UTMI_PLL_PLLCALI12_SHIFT
> + | 1<<UTMI_PLL_ICP_SHIFT | 3<<UTMI_PLL_KVCO_SHIFT);
> +
> + /* UTMI_TX */
> + u2o_clear(base, UTMI_TX, UTMI_TX_REG_EXT_FS_RCAL_EN_MASK
> + | UTMI_TX_TXVDD12_MASK | UTMI_TX_CK60_PHSEL_MASK
> + | UTMI_TX_IMPCAL_VTH_MASK | UTMI_TX_REG_EXT_FS_RCAL_MASK
> + | UTMI_TX_AMP_MASK);
> + u2o_set(base, UTMI_TX, 3<<UTMI_TX_TXVDD12_SHIFT
> + | 4<<UTMI_TX_CK60_PHSEL_SHIFT | 4<<UTMI_TX_IMPCAL_VTH_SHIFT
> + | 8<<UTMI_TX_REG_EXT_FS_RCAL_SHIFT | 3<<UTMI_TX_AMP_SHIFT);
> +
> + /* UTMI_RX */
> + u2o_clear(base, UTMI_RX, UTMI_RX_SQ_THRESH_MASK
> + | UTMI_REG_SQ_LENGTH_MASK);
> + u2o_set(base, UTMI_RX, 7<<UTMI_RX_SQ_THRESH_SHIFT
> + | 2<<UTMI_REG_SQ_LENGTH_SHIFT);
> +
> + /* UTMI_IVREF */
> + if (pxa_usb_phy->version == PXA_USB_PHY_PXA168) {
> + /*
> + * fixing Microsoft Altair board interface with NEC hub issue -
> + * Set UTMI_IVREF from 0x4a3 to 0x4bf
> + */
> + u2o_write(base, UTMI_IVREF, 0x4bf);
> + }
> +
> + /* toggle VCOCAL_START bit of UTMI_PLL */
> + udelay(200);
> + u2o_set(base, UTMI_PLL, VCOCAL_START);
> + udelay(40);
> + u2o_clear(base, UTMI_PLL, VCOCAL_START);
> +
> + /* toggle REG_RCAL_START bit of UTMI_TX */
> + udelay(400);
> + u2o_set(base, UTMI_TX, REG_RCAL_START);
> + udelay(40);
> + u2o_clear(base, UTMI_TX, REG_RCAL_START);
> + udelay(400);
> +
> + /* Make sure PHY PLL is ready */
> + loops = 0;
> + while ((u2o_get(base, UTMI_PLL) & PLL_READY) == 0) {
> + mdelay(1);
> + loops++;
> + if (loops > 100) {
> + dev_warn(&phy->dev, "calibrate timeout, UTMI_PLL %x\n",
> + u2o_get(base, UTMI_PLL));
> + break;
> + }
> + }
> +
> + if (pxa_usb_phy->version == PXA_USB_PHY_PXA168) {
> + u2o_set(base, UTMI_RESERVE, 1 << 5);
> + /* Turn on UTMI PHY OTG extension */
> + u2o_write(base, UTMI_OTG_ADDON, 1);
> + }
> +
> + return 0;
> +
> +}
> +
> +static int pxa_usb_phy_exit(struct phy *phy)
> +{
> + struct pxa_usb_phy *pxa_usb_phy = phy_get_drvdata(phy);
> + void __iomem *base = pxa_usb_phy->base;
> +
> + dev_info(&phy->dev, "deinitializing Marvell PXA USB PHY");
> +
> + if (pxa_usb_phy->version == PXA_USB_PHY_PXA168)
> + u2o_clear(base, UTMI_OTG_ADDON, UTMI_OTG_ADDON_OTG_ON);
> +
> + u2o_clear(base, UTMI_CTRL, UTMI_CTRL_RXBUF_PDWN);
> + u2o_clear(base, UTMI_CTRL, UTMI_CTRL_TXBUF_PDWN);
> + u2o_clear(base, UTMI_CTRL, UTMI_CTRL_USB_CLK_EN);
> + u2o_clear(base, UTMI_CTRL, 1<<UTMI_CTRL_PWR_UP_SHIFT);
> + u2o_clear(base, UTMI_CTRL, 1<<UTMI_CTRL_PLL_PWR_UP_SHIFT);
> +
> + return 0;
> +}
> +
> +static const struct phy_ops pxa_usb_phy_ops = {
> + .init = pxa_usb_phy_init,
> + .exit = pxa_usb_phy_exit,
> + .owner = THIS_MODULE,
> +};
> +
> +static const struct of_device_id pxa_usb_phy_of_match[] = {
> + {
> + .compatible = "marvell,mmp2-usb-phy",
> + .data = (void *)PXA_USB_PHY_MMP2,
> + }, {
> + .compatible = "marvell,pxa910-usb-phy",
> + .data = (void *)PXA_USB_PHY_PXA910,
> + }, {
> + .compatible = "marvell,pxa168-usb-phy",
> + .data = (void *)PXA_USB_PHY_PXA168,
> + },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, pxa_usb_phy_of_match);
> +
> +static int pxa_usb_phy_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct resource *resource;
> + struct pxa_usb_phy *pxa_usb_phy;
> + struct phy_provider *provider;
> + const struct of_device_id *of_id;
> +
> + pxa_usb_phy = devm_kzalloc(dev, sizeof(struct pxa_usb_phy), GFP_KERNEL);
> + if (!pxa_usb_phy)
> + return -ENOMEM;
> +
> + of_id = of_match_node(pxa_usb_phy_of_match, dev->of_node);
> + if (of_id)
> + pxa_usb_phy->version = (enum pxa_usb_phy_version)of_id->data;
> + else
> + pxa_usb_phy->version = PXA_USB_PHY_MMP2;
> +
> + resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + pxa_usb_phy->base = devm_ioremap_resource(dev, resource);
> + if (IS_ERR(pxa_usb_phy->base)) {
> + dev_err(dev, "failed to remap PHY regs\n");
> + return PTR_ERR(pxa_usb_phy->base);
> + }
> +
> + pxa_usb_phy->phy = devm_phy_create(dev, NULL, &pxa_usb_phy_ops);
> + if (IS_ERR(pxa_usb_phy->phy)) {
> + dev_err(dev, "failed to create PHY\n");
> + return PTR_ERR(pxa_usb_phy->phy);
> + }
> +
> + phy_set_drvdata(pxa_usb_phy->phy, pxa_usb_phy);
> + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> + if (IS_ERR(provider)) {
> + dev_err(dev, "failed to register PHY provider\n");
> + return PTR_ERR(provider);
> + }
> +
> + if (!dev->of_node) {
> + phy_create_lookup(pxa_usb_phy->phy, "usb", "mv-udc");
> + phy_create_lookup(pxa_usb_phy->phy, "usb", "pxa-u2oehci");
> + phy_create_lookup(pxa_usb_phy->phy, "usb", "mv-otg");
> + }
> +
> + dev_info(dev, "Marvell PXA USB PHY");
> + return 0;
> +}
> +
> +static struct platform_driver pxa_usb_phy_driver = {
> + .probe = pxa_usb_phy_probe,
> + .driver = {
> + .name = "pxa-usb-phy",
> + .of_match_table = pxa_usb_phy_of_match,
> + },
> +};
> +module_platform_driver(pxa_usb_phy_driver);
> +
> +MODULE_AUTHOR("Lubomir Rintel <lkundrak@...sk>");
> +MODULE_DESCRIPTION("Marvell PXA USB PHY Driver");
> +MODULE_LICENSE("GPL v2");
>
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