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phy: amlogic: meson8b-usb2: Use a MMIO regmap 

Using a MMIO regmap and switch to regmap_update_bits() to simplify the
code in the driver. Also switch to devm_platform_ioremap_resource()
instead of open-coding it. No functional changes intended.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: Thomas Graichen <thomas.graichen@gmail.com>
Link: https://lore.kernel.org/r/20200512222424.549351-4-martin.blumenstingl@googlemail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Martin Blumenstingl 2020-05-13 00:24:21 +02:00 committed by Vinod Koul
parent 2c0dd84403
commit de143a40fa
2 changed files with 35 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/phy/amlogic/Kconfig
View File

@ -9,6 +9,7 @@ config PHY_MESON8B_USB2
depends on USB_SUPPORT
select USB_COMMON
select GENERIC_PHY
select REGMAP_MMIO
help
Enable this to support the Meson USB2 PHYs found in Meson8,
Meson8b and GXBB SoCs.

73
drivers/phy/amlogic/phy-meson8b-usb2.c
View File

@ -10,6 +10,7 @@
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
@ -105,34 +106,24 @@
#define ACA_ENABLE_COMPLETE_TIME 50
struct phy_meson8b_usb2_priv {
void __iomem *regs;
struct regmap *regmap;
enum usb_dr_mode dr_mode;
struct clk *clk_usb_general;
struct clk *clk_usb;
struct reset_control *reset;
};
static u32 phy_meson8b_usb2_read(struct phy_meson8b_usb2_priv *phy_priv,
u32 reg)
{
return readl(phy_priv->regs + reg);
}
static void phy_meson8b_usb2_mask_bits(struct phy_meson8b_usb2_priv *phy_priv,
u32 reg, u32 mask, u32 value)
{
u32 data;
data = phy_meson8b_usb2_read(phy_priv, reg);
data &= ~mask;
data |= (value & mask);
writel(data, phy_priv->regs + reg);
}
static const struct regmap_config phy_meson8b_usb2_regmap_conf = {
.reg_bits = 8,
.val_bits = 32,
.reg_stride = 4,
.max_register = REG_TUNE,
};
static int phy_meson8b_usb2_power_on(struct phy *phy)
{
struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
u32 reg;
int ret;
if (!IS_ERR_OR_NULL(priv->reset)) {
@ -156,34 +147,34 @@ static int phy_meson8b_usb2_power_on(struct phy *phy)
return ret;
}
phy_meson8b_usb2_mask_bits(priv, REG_CONFIG, REG_CONFIG_CLK_32k_ALTSEL,
REG_CONFIG_CLK_32k_ALTSEL);
regmap_update_bits(priv->regmap, REG_CONFIG, REG_CONFIG_CLK_32k_ALTSEL,
REG_CONFIG_CLK_32k_ALTSEL);
phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_REF_CLK_SEL_MASK,
0x2 << REG_CTRL_REF_CLK_SEL_SHIFT);
regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_REF_CLK_SEL_MASK,
0x2 << REG_CTRL_REF_CLK_SEL_SHIFT);
phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_FSEL_MASK,
0x5 << REG_CTRL_FSEL_SHIFT);
regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_FSEL_MASK,
0x5 << REG_CTRL_FSEL_SHIFT);
/* reset the PHY */
phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_POWER_ON_RESET,
REG_CTRL_POWER_ON_RESET);
regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET,
REG_CTRL_POWER_ON_RESET);
udelay(RESET_COMPLETE_TIME);
phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_POWER_ON_RESET, 0);
regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET, 0);
udelay(RESET_COMPLETE_TIME);
phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT,
REG_CTRL_SOF_TOGGLE_OUT);
regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT,
REG_CTRL_SOF_TOGGLE_OUT);
if (priv->dr_mode == USB_DR_MODE_HOST) {
phy_meson8b_usb2_mask_bits(priv, REG_ADP_BC,
REG_ADP_BC_ACA_ENABLE,
REG_ADP_BC_ACA_ENABLE);
regmap_update_bits(priv->regmap, REG_ADP_BC,
REG_ADP_BC_ACA_ENABLE,
REG_ADP_BC_ACA_ENABLE);
udelay(ACA_ENABLE_COMPLETE_TIME);
if (phy_meson8b_usb2_read(priv, REG_ADP_BC) &
REG_ADP_BC_ACA_PIN_FLOAT) {
regmap_read(priv->regmap, REG_ADP_BC, &reg);
if (reg & REG_ADP_BC_ACA_PIN_FLOAT) {
dev_warn(&phy->dev, "USB ID detect failed!\n");
clk_disable_unprepare(priv->clk_usb);
clk_disable_unprepare(priv->clk_usb_general);
@ -213,18 +204,22 @@ static const struct phy_ops phy_meson8b_usb2_ops = {
static int phy_meson8b_usb2_probe(struct platform_device *pdev)
{
struct phy_meson8b_usb2_priv *priv;
struct resource *res;
struct phy *phy;
struct phy_provider *phy_provider;
void __iomem *base;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->regs))
return PTR_ERR(priv->regs);
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
priv->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&phy_meson8b_usb2_regmap_conf);
if (IS_ERR(priv->regmap))
return PTR_ERR(priv->regmap);
priv->clk_usb_general = devm_clk_get(&pdev->dev, "usb_general");
if (IS_ERR(priv->clk_usb_general))