lkml.org 
[lkml]   [2019]   [Apr]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v2 2/2] phy: ralink: Add PHY driver for MT7621 PCIe PHY
From
Date
Hi,

On 30/03/19 11:20 AM, Sergio Paracuellos wrote:
> This patch adds a driver for the PCIe PHY of MT7621 SoC.
>
> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
> ---
> drivers/phy/ralink/Kconfig | 7 +
> drivers/phy/ralink/Makefile | 1 +
> drivers/phy/ralink/phy-mt7621-pci.c | 401 ++++++++++++++++++++++++++++
> 3 files changed, 409 insertions(+)
> create mode 100644 drivers/phy/ralink/phy-mt7621-pci.c
>
> diff --git a/drivers/phy/ralink/Kconfig b/drivers/phy/ralink/Kconfig
> index 14fd219535ef..87943a10f210 100644
> --- a/drivers/phy/ralink/Kconfig
> +++ b/drivers/phy/ralink/Kconfig
> @@ -1,6 +1,13 @@
> #
> # PHY drivers for Ralink platforms.
> #
> +config PHY_MT7621_PCI
> + tristate "MediaTek MT7621 PCI PHY Driver"

Shouldn't this be in drivers/phy/mediatek/ then?
> + depends on RALINK && OF

Add depends on COMPILE_TEST.
> + select GENERIC_PHY
> + help
> + Say 'Y' here to add support for MediaTek MT7621 PCI PHY driver,
> +
> config PHY_RALINK_USB
> tristate "Ralink USB PHY driver"
> depends on RALINK || COMPILE_TEST
> diff --git a/drivers/phy/ralink/Makefile b/drivers/phy/ralink/Makefile
> index 5c9e326e8757..2052d5649863 100644
> --- a/drivers/phy/ralink/Makefile
> +++ b/drivers/phy/ralink/Makefile
> @@ -1 +1,2 @@
> +obj-$(CONFIG_PHY_MT7621_PCI) += phy-mt7621-pci.o
> obj-$(CONFIG_PHY_RALINK_USB) += phy-ralink-usb.o
> diff --git a/drivers/phy/ralink/phy-mt7621-pci.c b/drivers/phy/ralink/phy-mt7621-pci.c
> new file mode 100644
> index 000000000000..118302c122ee
> --- /dev/null
> +++ b/drivers/phy/ralink/phy-mt7621-pci.c
> @@ -0,0 +1,401 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Mediatek MT7621 PCI PHY Driver
> + * Author: Sergio Paracuellos <sergio.paracuellos@gmail.com>
> + */
> +
> +#include <dt-bindings/phy/phy.h>
> +#include <linux/bitops.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <mt7621.h>
> +#include <ralink_regs.h>
> +
> +#define RALINK_CLKCFG1 0x30
> +#define CHIP_REV_MT7621_E2 0x0101

Is this PHY specific or SoC revision? If it is SoC, we should use
soc_device_attribute and soc_device_match.
> +
> +#define PCIE_PORT_CLK_EN(x) BIT(24 + (x))
> +
> +#define RG_PE1_PIPE_REG 0x02c
> +#define RG_PE1_PIPE_RST BIT(12)
> +#define RG_PE1_PIPE_CMD_FRC BIT(4)
> +
> +#define RG_P0_TO_P1_WIDTH 0x100
> +#define RG_PE1_H_LCDDS_REG 0x49c
> +#define RG_PE1_H_LCDDS_PCW GENMASK(30, 0)
> +#define RG_PE1_H_LCDDS_PCW_VAL(x) ((0x7fffffff & (x)) << 0)
> +
> +#define RG_PE1_FRC_H_XTAL_REG 0x400
> +#define RG_PE1_FRC_H_XTAL_TYPE BIT(8)
> +#define RG_PE1_H_XTAL_TYPE GENMASK(10, 9)
> +#define RG_PE1_H_XTAL_TYPE_VAL(x) ((0x3 & (x)) << 9)
> +
> +#define RG_PE1_FRC_PHY_REG 0x000
> +#define RG_PE1_FRC_PHY_EN BIT(4)
> +#define RG_PE1_PHY_EN BIT(5)
> +
> +#define RG_PE1_H_PLL_REG 0x490
> +#define RG_PE1_H_PLL_BC GENMASK(23, 22)
> +#define RG_PE1_H_PLL_BC_VAL(x) ((0x3 & (x)) << 22)
> +#define RG_PE1_H_PLL_BP GENMASK(21, 18)
> +#define RG_PE1_H_PLL_BP_VAL(x) ((0xf & (x)) << 18)
> +#define RG_PE1_H_PLL_IR GENMASK(15, 12)
> +#define RG_PE1_H_PLL_IR_VAL(x) ((0xf & (x)) << 12)
> +#define RG_PE1_H_PLL_IC GENMASK(11, 8)
> +#define RG_PE1_H_PLL_IC_VAL(x) ((0xf & (x)) << 8)
> +#define RG_PE1_H_PLL_PREDIV GENMASK(7, 6)
> +#define RG_PE1_H_PLL_PREDIV_VAL(x) ((0x3 & (x)) << 6)
> +#define RG_PE1_PLL_DIVEN GENMASK(3, 1)
> +#define RG_PE1_PLL_DIVEN_VAL(x) ((0x7 & (x)) << 1)
> +
> +#define RG_PE1_H_PLL_FBKSEL_REG 0x4bc
> +#define RG_PE1_H_PLL_FBKSEL GENMASK(5, 4)
> +#define RG_PE1_H_PLL_FBKSEL_VAL(x) ((0x3 & (x)) << 4)
> +
> +#define RG_PE1_H_LCDDS_SSC_PRD_REG 0x4a4
> +#define RG_PE1_H_LCDDS_SSC_PRD GENMASK(15, 0)
> +#define RG_PE1_H_LCDDS_SSC_PRD_VAL(x) ((0xffff & (x)) << 0)
> +
> +#define RG_PE1_H_LCDDS_SSC_DELTA_REG 0x4a8
> +#define RG_PE1_H_LCDDS_SSC_DELTA GENMASK(11, 0)
> +#define RG_PE1_H_LCDDS_SSC_DELTA_VAL(x) ((0xfff & (x)) << 0)
> +#define RG_PE1_H_LCDDS_SSC_DELTA1 GENMASK(27, 16)
> +#define RG_PE1_H_LCDDS_SSC_DELTA1_VAL(x) ((0xff & (x)) << 16)
> +
> +#define RG_PE1_LCDDS_CLK_PH_INV_REG 0x4a0
> +#define RG_PE1_LCDDS_CLK_PH_INV BIT(5)
> +
> +#define RG_PE1_H_PLL_BR_REG 0x4ac
> +#define RG_PE1_H_PLL_BR GENMASK(18, 16)
> +#define RG_PE1_H_PLL_BR_VAL(x) ((0x7 & (x)) << 16)
> +
> +#define RG_PE1_MSTCKDIV_REG 0x414
> +#define RG_PE1_MSTCKDIV GENMASK(7, 6)
> +#define RG_PE1_MSTCKDIV_VAL(x) ((0x3 & (x)) << 6)
> +
> +#define RG_PE1_FRC_MSTCKDIV BIT(5)
> +
> +#define MAX_PHYS 2
> +
> +/**
> + * struct mt7621_pci_phy_instance - Mt7621 Pcie PHY device
> + * @phy: pointer to the kernel PHY device
> + * @port_base: base register
> + * @index: internal ID to identify the Mt7621 PCIe PHY
> + */
> +struct mt7621_pci_phy_instance {
> + struct phy *phy;
> + void __iomem *port_base;
> + u32 index;
> +};
> +
> +/**
> + * struct mt7621_pci_phy - Mt7621 Pcie PHY core
> + * @dev: pointer to device
> + * @phys: pointer to Mt7621 PHY device
> + * @nphys: number of PHY devices for this core
> + */
> +struct mt7621_pci_phy {
> + struct device *dev;
> + struct mt7621_pci_phy_instance **phys;
> + int nphys;
> +};
> +
> +static inline u32 phy_read(struct mt7621_pci_phy_instance *instance, u32 reg)
> +{
> + return readl(instance->port_base + reg);
> +}
> +
> +static inline void phy_write(struct mt7621_pci_phy_instance *instance,
> + u32 val, u32 reg)
> +{
> + writel(val, instance->port_base + reg);
> +}
> +
> +static void mt7621_bypass_pipe_rst(struct mt7621_pci_phy *phy,
> + struct mt7621_pci_phy_instance *instance)
> +{
> + u32 offset = (instance->index != 1) ?
> + RG_PE1_PIPE_REG : RG_PE1_PIPE_REG + RG_P0_TO_P1_WIDTH;
> + u32 reg;
> +
> + reg = phy_read(instance, offset);
> + reg &= ~(RG_PE1_PIPE_RST | RG_PE1_PIPE_CMD_FRC);
> + reg |= (RG_PE1_PIPE_RST | RG_PE1_PIPE_CMD_FRC);
> + phy_write(instance, reg, offset);
> +}
> +
> +static void mt7621_set_phy_for_ssc(struct mt7621_pci_phy *phy,
> + struct mt7621_pci_phy_instance *instance)
> +{
> + struct device *dev = phy->dev;
> + u32 reg = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG0);
> + u32 offset;
> + u32 val;
> +
> + reg = (reg >> 6) & 0x7;
> + /* Set PCIe Port PHY to disable SSC */
> + /* Debug Xtal Type */
> + val = phy_read(instance, RG_PE1_FRC_H_XTAL_REG);
> + val &= ~(RG_PE1_FRC_H_XTAL_TYPE | RG_PE1_H_XTAL_TYPE);
> + val |= RG_PE1_FRC_H_XTAL_TYPE;
> + val |= RG_PE1_H_XTAL_TYPE_VAL(0x00);

All this will be easier to maintain if regmap reg_field is used instead of
using readl/writel directly.
> + phy_write(instance, val, RG_PE1_FRC_H_XTAL_REG);
> +
> + /* disable port */
> + offset = (instance->index != 1) ?
> + RG_PE1_FRC_PHY_REG : RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH;
> + val = phy_read(instance, offset);
> + val &= ~(RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN);
> + val |= RG_PE1_FRC_PHY_EN;
> + phy_write(instance, val, offset);
> +
> + /* Set Pre-divider ratio (for host mode) */
> + val = phy_read(instance, RG_PE1_H_PLL_REG);
> + val &= ~(RG_PE1_H_PLL_PREDIV);
> +
> + if (reg <= 5 && reg >= 3) { /* 40MHz Xtal */
> + val |= RG_PE1_H_PLL_PREDIV_VAL(0x01);
> + phy_write(instance, val, RG_PE1_H_PLL_REG);
> + dev_info(dev, "Xtal is 40MHz\n");
> + } else { /* 25MHz | 20MHz Xtal */
> + val |= RG_PE1_H_PLL_PREDIV_VAL(0x00);
> + phy_write(instance, val, RG_PE1_H_PLL_REG);
> + if (reg >= 6) {
> + dev_info(dev, "Xtal is 25MHz\n");
> +
> + /* Select feedback clock */
> + val = phy_read(instance, RG_PE1_H_PLL_FBKSEL_REG);
> + val &= ~(RG_PE1_H_PLL_FBKSEL);
> + val |= RG_PE1_H_PLL_FBKSEL_VAL(0x01);
> + phy_write(instance, val, RG_PE1_H_PLL_FBKSEL_REG);
> +
> + /* DDS NCPO PCW (for host mode) */
> + val = phy_read(instance, RG_PE1_H_LCDDS_SSC_PRD_REG);
> + val &= ~(RG_PE1_H_LCDDS_SSC_PRD);
> + val |= RG_PE1_H_LCDDS_SSC_PRD_VAL(0x18000000);
> + phy_write(instance, val, RG_PE1_H_LCDDS_SSC_PRD_REG);
> +
> + /* DDS SSC dither period control */
> + val = phy_read(instance, RG_PE1_H_LCDDS_SSC_PRD_REG);
> + val &= ~(RG_PE1_H_LCDDS_SSC_PRD);
> + val |= RG_PE1_H_LCDDS_SSC_PRD_VAL(0x18d);
> + phy_write(instance, val, RG_PE1_H_LCDDS_SSC_PRD_REG);
> +
> + /* DDS SSC dither amplitude control */
> + val = phy_read(instance, RG_PE1_H_LCDDS_SSC_DELTA_REG);
> + val &= ~(RG_PE1_H_LCDDS_SSC_DELTA |
> + RG_PE1_H_LCDDS_SSC_DELTA1);
> + val |= RG_PE1_H_LCDDS_SSC_DELTA_VAL(0x4a);
> + val |= RG_PE1_H_LCDDS_SSC_DELTA1_VAL(0x4a);
> + phy_write(instance, val, RG_PE1_H_LCDDS_SSC_DELTA_REG);
> + } else {
> + dev_info(dev, "Xtal is 20MHz\n");
> + }
> + }
> +
> + /* DDS clock inversion */
> + val = phy_read(instance, RG_PE1_LCDDS_CLK_PH_INV_REG);
> + val &= ~(RG_PE1_LCDDS_CLK_PH_INV);
> + val |= RG_PE1_LCDDS_CLK_PH_INV;
> + phy_write(instance, val, RG_PE1_LCDDS_CLK_PH_INV_REG);
> +
> + /* Set PLL bits */
> + val = phy_read(instance, RG_PE1_H_PLL_REG);
> + val &= ~(RG_PE1_H_PLL_BC | RG_PE1_H_PLL_BP | RG_PE1_H_PLL_IR |
> + RG_PE1_H_PLL_IC | RG_PE1_PLL_DIVEN);
> + val |= RG_PE1_H_PLL_BC_VAL(0x02);
> + val |= RG_PE1_H_PLL_BP_VAL(0x06);
> + val |= RG_PE1_H_PLL_IR_VAL(0x02);
> + val |= RG_PE1_H_PLL_IC_VAL(0x01);
> + val |= RG_PE1_PLL_DIVEN_VAL(0x02);
> + phy_write(instance, val, RG_PE1_H_PLL_REG);
> +
> + val = phy_read(instance, RG_PE1_H_PLL_BR_REG);
> + val &= ~(RG_PE1_H_PLL_BR);
> + val |= RG_PE1_H_PLL_BR_VAL(0x00);
> + phy_write(instance, val, RG_PE1_H_PLL_BR_REG);
> +
> + if (reg <= 5 && reg >= 3) { /* 40MHz Xtal */
> + /* set force mode enable of da_pe1_mstckdiv */
> + val = phy_read(instance, RG_PE1_MSTCKDIV_REG);
> + val &= ~(RG_PE1_MSTCKDIV | RG_PE1_FRC_MSTCKDIV);
> + val |= (RG_PE1_MSTCKDIV_VAL(0x01) | RG_PE1_FRC_MSTCKDIV);
> + phy_write(instance, val, RG_PE1_MSTCKDIV_REG);
> + }
> +}
> +
> +static int mt7621_pci_phy_init(struct phy *phy)
> +{
> + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy);
> + struct mt7621_pci_phy *mphy = dev_get_drvdata(phy->dev.parent);
> + u32 chip_rev_id = rt_sysc_r32(SYSC_REG_CHIP_REV);
> +
> + if ((chip_rev_id & 0xFFFF) == CHIP_REV_MT7621_E2)
> + mt7621_bypass_pipe_rst(mphy, instance);
> +
> + mt7621_set_phy_for_ssc(mphy, instance);
> +
> + return 0;
> +}
> +
> +static int mt7621_pci_phy_power_on(struct phy *phy)
> +{
> + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy);
> + u32 offset = (instance->index != 1) ?
> + RG_PE1_FRC_PHY_REG : RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH;
> + u32 val;
> +
> + /* Enable PHY and disable force mode */
> + val = phy_read(instance, offset);
> + val &= ~(RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN);
> + val |= (RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN);
> + phy_write(instance, val, offset);
> +
> + return 0;
> +}
> +
> +static int mt7621_pci_phy_power_off(struct phy *phy)
> +{
> + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy);
> + u32 offset = (instance->index != 1) ?
> + RG_PE1_FRC_PHY_REG : RG_PE1_FRC_PHY_REG + RG_P0_TO_P1_WIDTH;
> + u32 val;
> +
> + /* Disable PHY */
> + val = phy_read(instance, offset);
> + val &= ~(RG_PE1_FRC_PHY_EN | RG_PE1_PHY_EN);
> + val |= RG_PE1_FRC_PHY_EN;
> + phy_write(instance, val, offset);
> +
> + return 0;
> +}
> +
> +static int mt7621_pci_phy_exit(struct phy *phy)
> +{
> + struct mt7621_pci_phy_instance *instance = phy_get_drvdata(phy);
> +
> + rt_sysc_m32(PCIE_PORT_CLK_EN(instance->index), 0, RALINK_CLKCFG1);
> +
> + return 0;
> +}
> +
> +static const struct phy_ops mt7621_pci_phy_ops = {
> + .init = mt7621_pci_phy_init,
> + .exit = mt7621_pci_phy_exit,
> + .power_on = mt7621_pci_phy_power_on,
> + .power_off = mt7621_pci_phy_power_off,
> + .owner = THIS_MODULE,
> +};
> +
> +static struct phy *mt7621_pcie_phy_of_xlate(struct device *dev,
> + struct of_phandle_args *args)
> +{
> + struct mt7621_pci_phy *mt7621_phy = dev_get_drvdata(dev);
> +
> + if (args->args_count == 0)
> + return mt7621_phy->phys[0]->phy;
> +
> + if (WARN_ON(args->args[0] >= MAX_PHYS))
> + return ERR_PTR(-ENODEV);
> +
> + return mt7621_phy->phys[args->args[0]]->phy;
> +}
> +
> +static int mt7621_pci_phy_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + struct device_node *child_np;
> + struct phy_provider *provider;
> + struct mt7621_pci_phy *phy;
> + struct resource res;
> + int port, ret;
> + void __iomem *port_base;
> +
> + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> + if (!phy)
> + return -ENOMEM;
> +
> + phy->nphys = MAX_PHYS;
> + phy->phys = devm_kcalloc(dev, phy->nphys,
> + sizeof(*phy->phys), GFP_KERNEL);
> + if (!phy->phys)
> + return -ENOMEM;
> +
> + phy->dev = dev;
> + platform_set_drvdata(pdev, phy);
> +
> + ret = of_address_to_resource(np, 0, &res);
> + if (ret) {
> + dev_err(dev, "failed to get address resource(id-%d)\n", port);
> + return ret;
> + }

Use platform_get_resource instead?

Thanks
Kishon

\
 
 \ /
  Last update: 2019-04-17 08:01    [W:0.069 / U:0.988 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site