* [PATCH] USB: phy: re-organize tegra phy driver
@ 2012-09-12 10:58 Venu Byravarasu
2012-09-12 18:36 ` Stephen Warren
0 siblings, 1 reply; 6+ messages in thread
From: Venu Byravarasu @ 2012-09-12 10:58 UTC (permalink / raw)
To: balbi; +Cc: linux-kernel, linux-usb, Venu Byravarasu
Nvidia produces several Tegra SOCs viz Tegra2, Tegra3 etc.
In order to support USB phy drivers on these SOCs, existing
phy driver is split into SOC agnostic common USB phy driver and
tegra2 specific USB phy driver.
This will facilitate easy addition & deletion of phy drivers for
Tegra SOCs.
Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com>
---
drivers/usb/host/ehci-tegra.c | 20 +-
drivers/usb/phy/Makefile | 1 +
drivers/usb/phy/tegra2_usb_phy.c | 561 ++++++++++++++++++++++++++++
drivers/usb/phy/tegra2_usb_phy.h | 175 +++++++++
drivers/usb/phy/tegra_usb_phy.c | 722 ++-----------------------------------
include/linux/usb/tegra_usb_phy.h | 34 ++-
6 files changed, 816 insertions(+), 697 deletions(-)
create mode 100644 drivers/usb/phy/tegra2_usb_phy.c
create mode 100644 drivers/usb/phy/tegra2_usb_phy.h
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 532db04..98d5e47 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -618,6 +618,9 @@ static int tegra_ehci_probe(struct platform_device *pdev)
int err = 0;
int irq;
int instance = pdev->id;
+ struct device_node *np = pdev->dev.of_node;
+ struct phy_params params;
+ int phy_type;
pdata = pdev->dev.platform_data;
if (!pdata) {
@@ -706,9 +709,22 @@ static int tegra_ehci_probe(struct platform_device *pdev)
}
}
+ phy_type = of_property_match_string(np, "phy_type", "utmi");
+ if (phy_type >= 0)
+ params.type = TEGRA_USB_PHY_TYPE_UTMI;
+ else {
+ phy_type = of_property_match_string(np, "phy_type", "ulpi");
+ if (phy_type >= 0)
+ params.type = TEGRA_USB_PHY_TYPE_ULPI;
+ else
+ params.type = TEGRA_USB_PHY_TYPE_INVALID;
+ }
+
+ params.mode = TEGRA_USB_PHY_MODE_HOST;
+ params.config = pdata->phy_config;
+
tegra->phy = tegra_usb_phy_open(&pdev->dev, instance, hcd->regs,
- pdata->phy_config,
- TEGRA_USB_PHY_MODE_HOST);
+ ¶ms);
if (IS_ERR(tegra->phy)) {
dev_err(&pdev->dev, "Failed to open USB phy\n");
err = -ENXIO;
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index bb948fb..45511e4 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -7,3 +7,4 @@ ccflags-$(CONFIG_USB_DEBUG) := -DDEBUG
obj-$(CONFIG_USB_ISP1301) += isp1301.o
obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o
obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o
+obj-$(CONFIG_USB_EHCI_TEGRA) += tegra2_usb_phy.o
diff --git a/drivers/usb/phy/tegra2_usb_phy.c b/drivers/usb/phy/tegra2_usb_phy.c
new file mode 100644
index 0000000..629f146
--- /dev/null
+++ b/drivers/usb/phy/tegra2_usb_phy.c
@@ -0,0 +1,561 @@
+/*
+ * Copyright (C) 2010 Google, Inc.
+ * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Author:
+ * Erik Gilling <konkers@google.com>
+ * Benoit Goby <benoit@android.com>
+ * Venu Byravarasu <vbyravarasu@nvidia.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/resource.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/ulpi.h>
+#include <asm/mach-types.h>
+#include <mach/gpio-tegra.h>
+#include <linux/usb/tegra_usb_phy.h>
+#include <mach/iomap.h>
+
+#include "tegra2_usb_phy.h"
+
+static DEFINE_SPINLOCK(utmip_pad_lock);
+static int utmip_pad_count;
+
+static inline bool phy_is_ulpi(struct tegra_usb_phy *phy)
+{
+ return (phy->type == TEGRA_USB_PHY_TYPE_ULPI);
+}
+
+
+static int tegra2_utmip_pad_open(struct tegra_usb_phy *phy)
+{
+ phy->pad_clk = clk_get_sys("utmip-pad", NULL);
+ if (IS_ERR(phy->pad_clk)) {
+ pr_err("%s: can't get utmip pad clock\n", __func__);
+ return PTR_ERR(phy->pad_clk);
+ }
+
+ if (phy->instance == 0) {
+ phy->pad_regs = phy->regs;
+ } else {
+ phy->pad_regs = ioremap(TEGRA_USB_BASE, TEGRA_USB_SIZE);
+ if (!phy->pad_regs) {
+ pr_err("%s: can't remap usb registers\n", __func__);
+ clk_put(phy->pad_clk);
+ return -ENOMEM;
+ }
+ }
+ return 0;
+}
+
+static void tegra2_utmip_pad_close(struct tegra_usb_phy *phy)
+{
+ if (phy->instance != 0)
+ iounmap(phy->pad_regs);
+ clk_put(phy->pad_clk);
+}
+
+static void tegra2_utmip_pad_power_on(struct tegra_usb_phy *phy)
+{
+ unsigned long val, flags;
+ void __iomem *base = phy->pad_regs;
+
+ clk_prepare_enable(phy->pad_clk);
+
+ spin_lock_irqsave(&utmip_pad_lock, flags);
+
+ if (utmip_pad_count++ == 0) {
+ val = readl(base + UTMIP_BIAS_CFG0);
+ val &= ~(UTMIP_OTGPD | UTMIP_BIASPD);
+ writel(val, base + UTMIP_BIAS_CFG0);
+ }
+
+ spin_unlock_irqrestore(&utmip_pad_lock, flags);
+
+ clk_disable_unprepare(phy->pad_clk);
+}
+
+static int tegra2_utmip_pad_power_off(struct tegra_usb_phy *phy)
+{
+ unsigned long val, flags;
+ void __iomem *base = phy->pad_regs;
+
+ if (!utmip_pad_count) {
+ pr_err("%s: utmip pad already powered off\n", __func__);
+ return -EINVAL;
+ }
+
+ clk_prepare_enable(phy->pad_clk);
+
+ spin_lock_irqsave(&utmip_pad_lock, flags);
+
+ if (--utmip_pad_count == 0) {
+ val = readl(base + UTMIP_BIAS_CFG0);
+ val |= UTMIP_OTGPD | UTMIP_BIASPD;
+ writel(val, base + UTMIP_BIAS_CFG0);
+ }
+
+ spin_unlock_irqrestore(&utmip_pad_lock, flags);
+
+ clk_disable_unprepare(phy->pad_clk);
+
+ return 0;
+}
+
+static int utmi_wait_register(void __iomem *reg, u32 mask, u32 result)
+{
+ unsigned long timeout = 2000;
+
+ do {
+ if ((readl(reg) & mask) == result)
+ return 0;
+ udelay(1);
+ timeout--;
+ } while (timeout);
+ return -1;
+}
+
+static void tegra2_utmi_phy_clk_disable(struct tegra_usb_phy *phy)
+{
+ unsigned long val;
+ void __iomem *base = phy->regs;
+
+ if (phy->instance == 0) {
+ val = readl(base + USB_SUSP_CTRL);
+ val |= USB_SUSP_SET;
+ writel(val, base + USB_SUSP_CTRL);
+
+ udelay(10);
+
+ val = readl(base + USB_SUSP_CTRL);
+ val &= ~USB_SUSP_SET;
+ writel(val, base + USB_SUSP_CTRL);
+ }
+
+ if (phy->instance == 2) {
+ val = readl(base + USB_PORTSC1);
+ val |= USB_PORTSC1_PHCD;
+ writel(val, base + USB_PORTSC1);
+ }
+
+ if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID, 0) < 0)
+ pr_err("%s: timeout waiting for phy to stabilize\n", __func__);
+}
+
+static void tegra2_utmi_phy_clk_enable(struct tegra_usb_phy *phy)
+{
+ unsigned long val;
+ void __iomem *base = phy->regs;
+
+ if (phy->instance == 0) {
+ val = readl(base + USB_SUSP_CTRL);
+ val |= USB_SUSP_CLR;
+ writel(val, base + USB_SUSP_CTRL);
+
+ udelay(10);
+
+ val = readl(base + USB_SUSP_CTRL);
+ val &= ~USB_SUSP_CLR;
+ writel(val, base + USB_SUSP_CTRL);
+ }
+
+ if (phy->instance == 2) {
+ val = readl(base + USB_PORTSC1);
+ val &= ~USB_PORTSC1_PHCD;
+ writel(val, base + USB_PORTSC1);
+ }
+
+ if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID,
+ USB_PHY_CLK_VALID))
+ pr_err("%s: timeout waiting for phy to stabilize\n", __func__);
+}
+
+static int tegra2_utmi_phy_power_on(struct tegra_usb_phy *phy)
+{
+ unsigned long val;
+ void __iomem *base = phy->regs;
+ struct tegra_utmip_config *config = phy->config;
+
+ val = readl(base + USB_SUSP_CTRL);
+ val |= UTMIP_RESET;
+ writel(val, base + USB_SUSP_CTRL);
+
+ if (phy->instance == 0) {
+ val = readl(base + USB1_LEGACY_CTRL);
+ val |= USB1_NO_LEGACY_MODE;
+ writel(val, base + USB1_LEGACY_CTRL);
+ }
+
+ val = readl(base + UTMIP_TX_CFG0);
+ val &= ~UTMIP_FS_PREABMLE_J;
+ writel(val, base + UTMIP_TX_CFG0);
+
+ val = readl(base + UTMIP_HSRX_CFG0);
+ val &= ~(UTMIP_IDLE_WAIT(~0) | UTMIP_ELASTIC_LIMIT(~0));
+ val |= UTMIP_IDLE_WAIT(config->idle_wait_delay);
+ val |= UTMIP_ELASTIC_LIMIT(config->elastic_limit);
+ writel(val, base + UTMIP_HSRX_CFG0);
+
+ val = readl(base + UTMIP_HSRX_CFG1);
+ val &= ~UTMIP_HS_SYNC_START_DLY(~0);
+ val |= UTMIP_HS_SYNC_START_DLY(config->hssync_start_delay);
+ writel(val, base + UTMIP_HSRX_CFG1);
+
+ val = readl(base + UTMIP_DEBOUNCE_CFG0);
+ val &= ~UTMIP_BIAS_DEBOUNCE_A(~0);
+ val |= UTMIP_BIAS_DEBOUNCE_A(phy->freq->debounce);
+ writel(val, base + UTMIP_DEBOUNCE_CFG0);
+
+ val = readl(base + UTMIP_MISC_CFG0);
+ val &= ~UTMIP_SUSPEND_EXIT_ON_EDGE;
+ writel(val, base + UTMIP_MISC_CFG0);
+
+ val = readl(base + UTMIP_MISC_CFG1);
+ val &= ~(UTMIP_PLL_ACTIVE_DLY_COUNT(~0) | UTMIP_PLLU_STABLE_COUNT(~0));
+ val |= UTMIP_PLL_ACTIVE_DLY_COUNT(phy->freq->active_delay) |
+ UTMIP_PLLU_STABLE_COUNT(phy->freq->stable_count);
+ writel(val, base + UTMIP_MISC_CFG1);
+
+ val = readl(base + UTMIP_PLL_CFG1);
+ val &= ~(UTMIP_XTAL_FREQ_COUNT(~0) | UTMIP_PLLU_ENABLE_DLY_COUNT(~0));
+ val |= UTMIP_XTAL_FREQ_COUNT(phy->freq->xtal_freq_count) |
+ UTMIP_PLLU_ENABLE_DLY_COUNT(phy->freq->enable_delay);
+ writel(val, base + UTMIP_PLL_CFG1);
+
+ if (phy->mode == TEGRA_USB_PHY_MODE_DEVICE) {
+ val = readl(base + USB_SUSP_CTRL);
+ val &= ~(USB_WAKE_ON_CNNT_EN_DEV | USB_WAKE_ON_DISCON_EN_DEV);
+ writel(val, base + USB_SUSP_CTRL);
+ }
+
+ tegra2_utmip_pad_power_on(phy);
+
+ val = readl(base + UTMIP_XCVR_CFG0);
+ val &= ~(UTMIP_FORCE_PD_POWERDOWN | UTMIP_FORCE_PD2_POWERDOWN |
+ UTMIP_FORCE_PDZI_POWERDOWN | UTMIP_XCVR_SETUP(~0) |
+ UTMIP_XCVR_LSFSLEW(~0) | UTMIP_XCVR_LSRSLEW(~0) |
+ UTMIP_XCVR_HSSLEW_MSB(~0));
+ val |= UTMIP_XCVR_SETUP(config->xcvr_setup);
+ val |= UTMIP_XCVR_LSFSLEW(config->xcvr_lsfslew);
+ val |= UTMIP_XCVR_LSRSLEW(config->xcvr_lsrslew);
+ writel(val, base + UTMIP_XCVR_CFG0);
+
+ val = readl(base + UTMIP_XCVR_CFG1);
+ val &= ~(UTMIP_FORCE_PDDISC_POWERDOWN | UTMIP_FORCE_PDCHRP_POWERDOWN |
+ UTMIP_FORCE_PDDR_POWERDOWN | UTMIP_XCVR_TERM_RANGE_ADJ(~0));
+ val |= UTMIP_XCVR_TERM_RANGE_ADJ(config->term_range_adj);
+ writel(val, base + UTMIP_XCVR_CFG1);
+
+ val = readl(base + UTMIP_BAT_CHRG_CFG0);
+ val &= ~UTMIP_PD_CHRG;
+ writel(val, base + UTMIP_BAT_CHRG_CFG0);
+
+ val = readl(base + UTMIP_BIAS_CFG1);
+ val &= ~UTMIP_BIAS_PDTRK_COUNT(~0);
+ val |= UTMIP_BIAS_PDTRK_COUNT(0x5);
+ writel(val, base + UTMIP_BIAS_CFG1);
+
+ if (phy->instance == 0) {
+ val = readl(base + UTMIP_SPARE_CFG0);
+ if (phy->mode == TEGRA_USB_PHY_MODE_DEVICE)
+ val &= ~FUSE_SETUP_SEL;
+ else
+ val |= FUSE_SETUP_SEL;
+ writel(val, base + UTMIP_SPARE_CFG0);
+ }
+
+ if (phy->instance == 2) {
+ val = readl(base + USB_SUSP_CTRL);
+ val |= UTMIP_PHY_ENABLE;
+ writel(val, base + USB_SUSP_CTRL);
+ }
+
+ val = readl(base + USB_SUSP_CTRL);
+ val &= ~UTMIP_RESET;
+ writel(val, base + USB_SUSP_CTRL);
+
+ if (phy->instance == 0) {
+ val = readl(base + USB1_LEGACY_CTRL);
+ val &= ~USB1_VBUS_SENSE_CTL_MASK;
+ val |= USB1_VBUS_SENSE_CTL_A_SESS_VLD;
+ writel(val, base + USB1_LEGACY_CTRL);
+
+ val = readl(base + USB_SUSP_CTRL);
+ val &= ~USB_SUSP_SET;
+ writel(val, base + USB_SUSP_CTRL);
+ }
+
+ tegra2_utmi_phy_clk_enable(phy);
+
+ if (phy->instance == 2) {
+ val = readl(base + USB_PORTSC1);
+ val &= ~USB_PORTSC1_PTS(~0);
+ writel(val, base + USB_PORTSC1);
+ }
+
+ return 0;
+}
+
+static int tegra2_utmi_phy_power_off(struct tegra_usb_phy *phy)
+{
+ unsigned long val;
+ void __iomem *base = phy->regs;
+
+ tegra2_utmi_phy_clk_disable(phy);
+
+ if (phy->mode == TEGRA_USB_PHY_MODE_DEVICE) {
+ val = readl(base + USB_SUSP_CTRL);
+ val &= ~USB_WAKEUP_DEBOUNCE_COUNT(~0);
+ val |= USB_WAKE_ON_CNNT_EN_DEV | USB_WAKEUP_DEBOUNCE_COUNT(5);
+ writel(val, base + USB_SUSP_CTRL);
+ }
+
+ val = readl(base + USB_SUSP_CTRL);
+ val |= UTMIP_RESET;
+ writel(val, base + USB_SUSP_CTRL);
+
+ val = readl(base + UTMIP_BAT_CHRG_CFG0);
+ val |= UTMIP_PD_CHRG;
+ writel(val, base + UTMIP_BAT_CHRG_CFG0);
+
+ val = readl(base + UTMIP_XCVR_CFG0);
+ val |= UTMIP_FORCE_PD_POWERDOWN | UTMIP_FORCE_PD2_POWERDOWN |
+ UTMIP_FORCE_PDZI_POWERDOWN;
+ writel(val, base + UTMIP_XCVR_CFG0);
+
+ val = readl(base + UTMIP_XCVR_CFG1);
+ val |= UTMIP_FORCE_PDDISC_POWERDOWN | UTMIP_FORCE_PDCHRP_POWERDOWN |
+ UTMIP_FORCE_PDDR_POWERDOWN;
+ writel(val, base + UTMIP_XCVR_CFG1);
+
+ return tegra2_utmip_pad_power_off(phy);
+}
+
+static void tegra2_utmi_phy_preresume(struct tegra_usb_phy *phy)
+{
+ unsigned long val;
+ void __iomem *base = phy->regs;
+
+ val = readl(base + UTMIP_TX_CFG0);
+ val |= UTMIP_HS_DISCON_DISABLE;
+ writel(val, base + UTMIP_TX_CFG0);
+}
+
+static void tegra2_utmi_phy_postresume(struct tegra_usb_phy *phy)
+{
+ unsigned long val;
+ void __iomem *base = phy->regs;
+
+ val = readl(base + UTMIP_TX_CFG0);
+ val &= ~UTMIP_HS_DISCON_DISABLE;
+ writel(val, base + UTMIP_TX_CFG0);
+}
+
+static void tegra2_utmi_phy_restore_start(struct tegra_usb_phy *phy,
+ enum tegra_usb_phy_port_speed port_speed)
+{
+ unsigned long val;
+ void __iomem *base = phy->regs;
+
+ val = readl(base + UTMIP_MISC_CFG0);
+ val &= ~UTMIP_DPDM_OBSERVE_SEL(~0);
+ if (port_speed == TEGRA_USB_PHY_PORT_SPEED_LOW)
+ val |= UTMIP_DPDM_OBSERVE_SEL_FS_K;
+ else
+ val |= UTMIP_DPDM_OBSERVE_SEL_FS_J;
+ writel(val, base + UTMIP_MISC_CFG0);
+ udelay(1);
+
+ val = readl(base + UTMIP_MISC_CFG0);
+ val |= UTMIP_DPDM_OBSERVE;
+ writel(val, base + UTMIP_MISC_CFG0);
+ udelay(10);
+}
+
+static void tegra2_utmi_phy_restore_end(struct tegra_usb_phy *phy)
+{
+ unsigned long val;
+ void __iomem *base = phy->regs;
+
+ val = readl(base + UTMIP_MISC_CFG0);
+ val &= ~UTMIP_DPDM_OBSERVE;
+ writel(val, base + UTMIP_MISC_CFG0);
+ udelay(10);
+}
+
+static int tegra2_ulpi_phy_power_on(struct tegra_usb_phy *phy)
+{
+ int ret;
+ unsigned long val;
+ void __iomem *base = phy->regs;
+ struct tegra_ulpi_config *config = phy->config;
+
+ gpio_direction_output(config->reset_gpio, 0);
+ msleep(5);
+ gpio_direction_output(config->reset_gpio, 1);
+
+ clk_prepare_enable(phy->clk);
+ msleep(1);
+
+ val = readl(base + USB_SUSP_CTRL);
+ val |= UHSIC_RESET;
+ writel(val, base + USB_SUSP_CTRL);
+
+ val = readl(base + ULPI_TIMING_CTRL_0);
+ val |= ULPI_OUTPUT_PINMUX_BYP | ULPI_CLKOUT_PINMUX_BYP;
+ writel(val, base + ULPI_TIMING_CTRL_0);
+
+ val = readl(base + USB_SUSP_CTRL);
+ val |= ULPI_PHY_ENABLE;
+ writel(val, base + USB_SUSP_CTRL);
+
+ val = 0;
+ writel(val, base + ULPI_TIMING_CTRL_1);
+
+ val |= ULPI_DATA_TRIMMER_SEL(4);
+ val |= ULPI_STPDIRNXT_TRIMMER_SEL(4);
+ val |= ULPI_DIR_TRIMMER_SEL(4);
+ writel(val, base + ULPI_TIMING_CTRL_1);
+ udelay(10);
+
+ val |= ULPI_DATA_TRIMMER_LOAD;
+ val |= ULPI_STPDIRNXT_TRIMMER_LOAD;
+ val |= ULPI_DIR_TRIMMER_LOAD;
+ writel(val, base + ULPI_TIMING_CTRL_1);
+
+ /* Fix VbusInvalid due to floating VBUS */
+ ret = usb_phy_io_write(phy->ulpi, 0x40, 0x08);
+ if (ret) {
+ pr_err("%s: ulpi write failed\n", __func__);
+ return ret;
+ }
+
+ ret = usb_phy_io_write(phy->ulpi, 0x80, 0x0B);
+ if (ret) {
+ pr_err("%s: ulpi write failed\n", __func__);
+ return ret;
+ }
+
+ val = readl(base + USB_PORTSC1);
+ val |= USB_PORTSC1_WKOC | USB_PORTSC1_WKDS | USB_PORTSC1_WKCN;
+ writel(val, base + USB_PORTSC1);
+
+ val = readl(base + USB_SUSP_CTRL);
+ val |= USB_SUSP_CLR;
+ writel(val, base + USB_SUSP_CTRL);
+ udelay(100);
+
+ val = readl(base + USB_SUSP_CTRL);
+ val &= ~USB_SUSP_CLR;
+ writel(val, base + USB_SUSP_CTRL);
+
+ return 0;
+}
+
+static int tegra2_ulpi_phy_power_off(struct tegra_usb_phy *phy)
+{
+ unsigned long val;
+ void __iomem *base = phy->regs;
+ struct tegra_ulpi_config *config = phy->config;
+
+ /* Clear WKCN/WKDS/WKOC wake-on events that can cause the USB
+ * Controller to immediately bring the ULPI PHY out of low power
+ */
+ val = readl(base + USB_PORTSC1);
+ val &= ~(USB_PORTSC1_WKOC | USB_PORTSC1_WKDS | USB_PORTSC1_WKCN);
+ writel(val, base + USB_PORTSC1);
+
+ clk_disable(phy->clk);
+ return gpio_direction_output(config->reset_gpio, 0);
+}
+
+static int tegra2_usb_phy_open(struct tegra_usb_phy *phy)
+{
+ struct tegra_ulpi_config *ulpi_config;
+ int err;
+
+ if (phy_is_ulpi(phy)) {
+ ulpi_config = phy->config;
+ phy->clk = clk_get_sys(NULL, ulpi_config->clk);
+ if (IS_ERR(phy->clk)) {
+ pr_err("%s: can't get ulpi clock\n", __func__);
+ err = -ENXIO;
+ goto err1;
+ }
+ if (!gpio_is_valid(ulpi_config->reset_gpio))
+ ulpi_config->reset_gpio =
+ of_get_named_gpio(phy->dev->of_node,
+ "nvidia,phy-reset-gpio", 0);
+ if (!gpio_is_valid(ulpi_config->reset_gpio)) {
+ pr_err("%s: invalid reset gpio: %d\n", __func__,
+ ulpi_config->reset_gpio);
+ err = -EINVAL;
+ goto err1;
+ }
+ gpio_request(ulpi_config->reset_gpio, "ulpi_phy_reset_b");
+ gpio_direction_output(ulpi_config->reset_gpio, 0);
+ phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
+ phy->ulpi->io_priv = phy->regs + ULPI_VIEWPORT;
+ } else {
+ err = tegra2_utmip_pad_open(phy);
+ if (err < 0)
+ goto err1;
+ }
+ return 0;
+err1:
+ clk_disable_unprepare(phy->pll_u);
+ clk_put(phy->pll_u);
+ return err;
+}
+
+static void tegra2_usb_phy_close(struct tegra_usb_phy *phy)
+{
+ if (phy_is_ulpi(phy))
+ clk_put(phy->clk);
+ else
+ tegra2_utmip_pad_close(phy);
+ clk_disable_unprepare(phy->pll_u);
+ clk_put(phy->pll_u);
+}
+
+int tegra2_usb_phy_init(struct tegra_usb_phy *phy)
+{
+ if ((phy->type != TEGRA_USB_PHY_TYPE_ULPI) &&
+ (phy->type != TEGRA_USB_PHY_TYPE_UTMI))
+ return -EINVAL;
+
+ phy->ops.open = tegra2_usb_phy_open;
+ phy->ops.close = tegra2_usb_phy_close;
+
+ if (phy_is_ulpi(phy)) {
+ phy->ops.power_on = tegra2_ulpi_phy_power_on;
+ phy->ops.power_off = tegra2_ulpi_phy_power_off;
+ } else if (phy->type == TEGRA_USB_PHY_TYPE_UTMI) {
+ phy->ops.postresume = tegra2_utmi_phy_postresume;
+ phy->ops.power_off = tegra2_utmi_phy_power_off;
+ phy->ops.power_on = tegra2_utmi_phy_power_on;
+ phy->ops.preresume = tegra2_utmi_phy_preresume;
+ phy->ops.restore_end = tegra2_utmi_phy_restore_end;
+ phy->ops.restore_start = tegra2_utmi_phy_restore_start;
+ }
+
+ return 0;
+}
diff --git a/drivers/usb/phy/tegra2_usb_phy.h b/drivers/usb/phy/tegra2_usb_phy.h
new file mode 100644
index 0000000..4d2637d
--- /dev/null
+++ b/drivers/usb/phy/tegra2_usb_phy.h
@@ -0,0 +1,175 @@
+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Author: Venu Byravarasu <vbyravarasu@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _TEGRA2_USB_PHY_H
+#define _TEGRA2_USB_PHY_H
+
+#define ULPI_VIEWPORT 0x170
+
+#define USB_PORTSC1 0x184
+#define USB_PORTSC1_PTS(x) (((x) & 0x3) << 30)
+#define USB_PORTSC1_PSPD(x) (((x) & 0x3) << 26)
+#define USB_PORTSC1_PHCD (1 << 23)
+#define USB_PORTSC1_WKOC (1 << 22)
+#define USB_PORTSC1_WKDS (1 << 21)
+#define USB_PORTSC1_WKCN (1 << 20)
+#define USB_PORTSC1_PTC(x) (((x) & 0xf) << 16)
+#define USB_PORTSC1_PP (1 << 12)
+#define USB_PORTSC1_SUSP (1 << 7)
+#define USB_PORTSC1_PE (1 << 2)
+#define USB_PORTSC1_CCS (1 << 0)
+
+#define USB_SUSP_CTRL 0x400
+#define USB_WAKE_ON_CNNT_EN_DEV (1 << 3)
+#define USB_WAKE_ON_DISCON_EN_DEV (1 << 4)
+#define USB_SUSP_CLR (1 << 5)
+#define USB_PHY_CLK_VALID (1 << 7)
+#define UTMIP_RESET (1 << 11)
+#define UHSIC_RESET (1 << 11)
+#define UTMIP_PHY_ENABLE (1 << 12)
+#define ULPI_PHY_ENABLE (1 << 13)
+#define USB_SUSP_SET (1 << 14)
+#define USB_WAKEUP_DEBOUNCE_COUNT(x) (((x) & 0x7) << 16)
+
+#define USB1_LEGACY_CTRL 0x410
+#define USB1_NO_LEGACY_MODE (1 << 0)
+#define USB1_VBUS_SENSE_CTL_MASK (3 << 1)
+#define USB1_VBUS_SENSE_CTL_VBUS_WAKEUP (0 << 1)
+#define USB1_VBUS_SENSE_CTL_AB_SESS_VLD_OR_VBUS_WAKEUP \
+ (1 << 1)
+#define USB1_VBUS_SENSE_CTL_AB_SESS_VLD (2 << 1)
+#define USB1_VBUS_SENSE_CTL_A_SESS_VLD (3 << 1)
+
+#define ULPI_TIMING_CTRL_0 0x424
+#define ULPI_OUTPUT_PINMUX_BYP (1 << 10)
+#define ULPI_CLKOUT_PINMUX_BYP (1 << 11)
+
+#define ULPI_TIMING_CTRL_1 0x428
+#define ULPI_DATA_TRIMMER_LOAD (1 << 0)
+#define ULPI_DATA_TRIMMER_SEL(x) (((x) & 0x7) << 1)
+#define ULPI_STPDIRNXT_TRIMMER_LOAD (1 << 16)
+#define ULPI_STPDIRNXT_TRIMMER_SEL(x) (((x) & 0x7) << 17)
+#define ULPI_DIR_TRIMMER_LOAD (1 << 24)
+#define ULPI_DIR_TRIMMER_SEL(x) (((x) & 0x7) << 25)
+
+#define UTMIP_PLL_CFG1 0x804
+#define UTMIP_XTAL_FREQ_COUNT(x) (((x) & 0xfff) << 0)
+#define UTMIP_PLLU_ENABLE_DLY_COUNT(x) (((x) & 0x1f) << 27)
+
+#define UTMIP_XCVR_CFG0 0x808
+#define UTMIP_XCVR_SETUP(x) (((x) & 0xf) << 0)
+#define UTMIP_XCVR_LSRSLEW(x) (((x) & 0x3) << 8)
+#define UTMIP_XCVR_LSFSLEW(x) (((x) & 0x3) << 10)
+#define UTMIP_FORCE_PD_POWERDOWN (1 << 14)
+#define UTMIP_FORCE_PD2_POWERDOWN (1 << 16)
+#define UTMIP_FORCE_PDZI_POWERDOWN (1 << 18)
+#define UTMIP_XCVR_HSSLEW_MSB(x) (((x) & 0x7f) << 25)
+
+#define UTMIP_BIAS_CFG0 0x80c
+#define UTMIP_OTGPD (1 << 11)
+#define UTMIP_BIASPD (1 << 10)
+
+#define UTMIP_HSRX_CFG0 0x810
+#define UTMIP_ELASTIC_LIMIT(x) (((x) & 0x1f) << 10)
+#define UTMIP_IDLE_WAIT(x) (((x) & 0x1f) << 15)
+
+#define UTMIP_HSRX_CFG1 0x814
+#define UTMIP_HS_SYNC_START_DLY(x) (((x) & 0x1f) << 1)
+
+#define UTMIP_TX_CFG0 0x820
+#define UTMIP_FS_PREABMLE_J (1 << 19)
+#define UTMIP_HS_DISCON_DISABLE (1 << 8)
+
+#define UTMIP_MISC_CFG0 0x824
+#define UTMIP_DPDM_OBSERVE (1 << 26)
+#define UTMIP_DPDM_OBSERVE_SEL(x) (((x) & 0xf) << 27)
+#define UTMIP_DPDM_OBSERVE_SEL_FS_J UTMIP_DPDM_OBSERVE_SEL(0xf)
+#define UTMIP_DPDM_OBSERVE_SEL_FS_K UTMIP_DPDM_OBSERVE_SEL(0xe)
+#define UTMIP_DPDM_OBSERVE_SEL_FS_SE1 UTMIP_DPDM_OBSERVE_SEL(0xd)
+#define UTMIP_DPDM_OBSERVE_SEL_FS_SE0 UTMIP_DPDM_OBSERVE_SEL(0xc)
+#define UTMIP_SUSPEND_EXIT_ON_EDGE (1 << 22)
+
+#define UTMIP_MISC_CFG1 0x828
+#define UTMIP_PLL_ACTIVE_DLY_COUNT(x) (((x) & 0x1f) << 18)
+#define UTMIP_PLLU_STABLE_COUNT(x) (((x) & 0xfff) << 6)
+
+#define UTMIP_DEBOUNCE_CFG0 0x82c
+#define UTMIP_BIAS_DEBOUNCE_A(x) (((x) & 0xffff) << 0)
+
+#define UTMIP_BAT_CHRG_CFG0 0x830
+#define UTMIP_PD_CHRG (1 << 0)
+
+#define UTMIP_SPARE_CFG0 0x834
+#define FUSE_SETUP_SEL (1 << 3)
+
+#define UTMIP_XCVR_CFG1 0x838
+#define UTMIP_FORCE_PDDISC_POWERDOWN (1 << 0)
+#define UTMIP_FORCE_PDCHRP_POWERDOWN (1 << 2)
+#define UTMIP_FORCE_PDDR_POWERDOWN (1 << 4)
+#define UTMIP_XCVR_TERM_RANGE_ADJ(x) (((x) & 0xf) << 18)
+
+#define UTMIP_BIAS_CFG1 0x83c
+#define UTMIP_BIAS_PDTRK_COUNT(x) (((x) & 0x1f) << 3)
+
+struct tegra_xtal_freq {
+ int freq;
+ u8 enable_delay;
+ u8 stable_count;
+ u8 active_delay;
+ u8 xtal_freq_count;
+ u16 debounce;
+};
+
+static const struct tegra_xtal_freq tegra_freq_table[] = {
+ {
+ .freq = 12000000,
+ .enable_delay = 0x02,
+ .stable_count = 0x2F,
+ .active_delay = 0x04,
+ .xtal_freq_count = 0x76,
+ .debounce = 0x7530,
+ },
+ {
+ .freq = 13000000,
+ .enable_delay = 0x02,
+ .stable_count = 0x33,
+ .active_delay = 0x05,
+ .xtal_freq_count = 0x7F,
+ .debounce = 0x7EF4,
+ },
+ {
+ .freq = 19200000,
+ .enable_delay = 0x03,
+ .stable_count = 0x4B,
+ .active_delay = 0x06,
+ .xtal_freq_count = 0xBB,
+ .debounce = 0xBB80,
+ },
+ {
+ .freq = 26000000,
+ .enable_delay = 0x04,
+ .stable_count = 0x66,
+ .active_delay = 0x09,
+ .xtal_freq_count = 0xFE,
+ .debounce = 0xFDE8,
+ },
+};
+
+int tegra2_usb_phy_init(struct tegra_usb_phy *phy);
+
+#endif /* _TEGRA2_USB_PHY_H */
diff --git a/drivers/usb/phy/tegra_usb_phy.c b/drivers/usb/phy/tegra_usb_phy.c
index 4739903..d6a9265 100644
--- a/drivers/usb/phy/tegra_usb_phy.c
+++ b/drivers/usb/phy/tegra_usb_phy.c
@@ -31,160 +31,7 @@
#include <mach/gpio-tegra.h>
#include <linux/usb/tegra_usb_phy.h>
#include <mach/iomap.h>
-
-#define ULPI_VIEWPORT 0x170
-
-#define USB_PORTSC1 0x184
-#define USB_PORTSC1_PTS(x) (((x) & 0x3) << 30)
-#define USB_PORTSC1_PSPD(x) (((x) & 0x3) << 26)
-#define USB_PORTSC1_PHCD (1 << 23)
-#define USB_PORTSC1_WKOC (1 << 22)
-#define USB_PORTSC1_WKDS (1 << 21)
-#define USB_PORTSC1_WKCN (1 << 20)
-#define USB_PORTSC1_PTC(x) (((x) & 0xf) << 16)
-#define USB_PORTSC1_PP (1 << 12)
-#define USB_PORTSC1_SUSP (1 << 7)
-#define USB_PORTSC1_PE (1 << 2)
-#define USB_PORTSC1_CCS (1 << 0)
-
-#define USB_SUSP_CTRL 0x400
-#define USB_WAKE_ON_CNNT_EN_DEV (1 << 3)
-#define USB_WAKE_ON_DISCON_EN_DEV (1 << 4)
-#define USB_SUSP_CLR (1 << 5)
-#define USB_PHY_CLK_VALID (1 << 7)
-#define UTMIP_RESET (1 << 11)
-#define UHSIC_RESET (1 << 11)
-#define UTMIP_PHY_ENABLE (1 << 12)
-#define ULPI_PHY_ENABLE (1 << 13)
-#define USB_SUSP_SET (1 << 14)
-#define USB_WAKEUP_DEBOUNCE_COUNT(x) (((x) & 0x7) << 16)
-
-#define USB1_LEGACY_CTRL 0x410
-#define USB1_NO_LEGACY_MODE (1 << 0)
-#define USB1_VBUS_SENSE_CTL_MASK (3 << 1)
-#define USB1_VBUS_SENSE_CTL_VBUS_WAKEUP (0 << 1)
-#define USB1_VBUS_SENSE_CTL_AB_SESS_VLD_OR_VBUS_WAKEUP \
- (1 << 1)
-#define USB1_VBUS_SENSE_CTL_AB_SESS_VLD (2 << 1)
-#define USB1_VBUS_SENSE_CTL_A_SESS_VLD (3 << 1)
-
-#define ULPI_TIMING_CTRL_0 0x424
-#define ULPI_OUTPUT_PINMUX_BYP (1 << 10)
-#define ULPI_CLKOUT_PINMUX_BYP (1 << 11)
-
-#define ULPI_TIMING_CTRL_1 0x428
-#define ULPI_DATA_TRIMMER_LOAD (1 << 0)
-#define ULPI_DATA_TRIMMER_SEL(x) (((x) & 0x7) << 1)
-#define ULPI_STPDIRNXT_TRIMMER_LOAD (1 << 16)
-#define ULPI_STPDIRNXT_TRIMMER_SEL(x) (((x) & 0x7) << 17)
-#define ULPI_DIR_TRIMMER_LOAD (1 << 24)
-#define ULPI_DIR_TRIMMER_SEL(x) (((x) & 0x7) << 25)
-
-#define UTMIP_PLL_CFG1 0x804
-#define UTMIP_XTAL_FREQ_COUNT(x) (((x) & 0xfff) << 0)
-#define UTMIP_PLLU_ENABLE_DLY_COUNT(x) (((x) & 0x1f) << 27)
-
-#define UTMIP_XCVR_CFG0 0x808
-#define UTMIP_XCVR_SETUP(x) (((x) & 0xf) << 0)
-#define UTMIP_XCVR_LSRSLEW(x) (((x) & 0x3) << 8)
-#define UTMIP_XCVR_LSFSLEW(x) (((x) & 0x3) << 10)
-#define UTMIP_FORCE_PD_POWERDOWN (1 << 14)
-#define UTMIP_FORCE_PD2_POWERDOWN (1 << 16)
-#define UTMIP_FORCE_PDZI_POWERDOWN (1 << 18)
-#define UTMIP_XCVR_HSSLEW_MSB(x) (((x) & 0x7f) << 25)
-
-#define UTMIP_BIAS_CFG0 0x80c
-#define UTMIP_OTGPD (1 << 11)
-#define UTMIP_BIASPD (1 << 10)
-
-#define UTMIP_HSRX_CFG0 0x810
-#define UTMIP_ELASTIC_LIMIT(x) (((x) & 0x1f) << 10)
-#define UTMIP_IDLE_WAIT(x) (((x) & 0x1f) << 15)
-
-#define UTMIP_HSRX_CFG1 0x814
-#define UTMIP_HS_SYNC_START_DLY(x) (((x) & 0x1f) << 1)
-
-#define UTMIP_TX_CFG0 0x820
-#define UTMIP_FS_PREABMLE_J (1 << 19)
-#define UTMIP_HS_DISCON_DISABLE (1 << 8)
-
-#define UTMIP_MISC_CFG0 0x824
-#define UTMIP_DPDM_OBSERVE (1 << 26)
-#define UTMIP_DPDM_OBSERVE_SEL(x) (((x) & 0xf) << 27)
-#define UTMIP_DPDM_OBSERVE_SEL_FS_J UTMIP_DPDM_OBSERVE_SEL(0xf)
-#define UTMIP_DPDM_OBSERVE_SEL_FS_K UTMIP_DPDM_OBSERVE_SEL(0xe)
-#define UTMIP_DPDM_OBSERVE_SEL_FS_SE1 UTMIP_DPDM_OBSERVE_SEL(0xd)
-#define UTMIP_DPDM_OBSERVE_SEL_FS_SE0 UTMIP_DPDM_OBSERVE_SEL(0xc)
-#define UTMIP_SUSPEND_EXIT_ON_EDGE (1 << 22)
-
-#define UTMIP_MISC_CFG1 0x828
-#define UTMIP_PLL_ACTIVE_DLY_COUNT(x) (((x) & 0x1f) << 18)
-#define UTMIP_PLLU_STABLE_COUNT(x) (((x) & 0xfff) << 6)
-
-#define UTMIP_DEBOUNCE_CFG0 0x82c
-#define UTMIP_BIAS_DEBOUNCE_A(x) (((x) & 0xffff) << 0)
-
-#define UTMIP_BAT_CHRG_CFG0 0x830
-#define UTMIP_PD_CHRG (1 << 0)
-
-#define UTMIP_SPARE_CFG0 0x834
-#define FUSE_SETUP_SEL (1 << 3)
-
-#define UTMIP_XCVR_CFG1 0x838
-#define UTMIP_FORCE_PDDISC_POWERDOWN (1 << 0)
-#define UTMIP_FORCE_PDCHRP_POWERDOWN (1 << 2)
-#define UTMIP_FORCE_PDDR_POWERDOWN (1 << 4)
-#define UTMIP_XCVR_TERM_RANGE_ADJ(x) (((x) & 0xf) << 18)
-
-#define UTMIP_BIAS_CFG1 0x83c
-#define UTMIP_BIAS_PDTRK_COUNT(x) (((x) & 0x1f) << 3)
-
-static DEFINE_SPINLOCK(utmip_pad_lock);
-static int utmip_pad_count;
-
-struct tegra_xtal_freq {
- int freq;
- u8 enable_delay;
- u8 stable_count;
- u8 active_delay;
- u8 xtal_freq_count;
- u16 debounce;
-};
-
-static const struct tegra_xtal_freq tegra_freq_table[] = {
- {
- .freq = 12000000,
- .enable_delay = 0x02,
- .stable_count = 0x2F,
- .active_delay = 0x04,
- .xtal_freq_count = 0x76,
- .debounce = 0x7530,
- },
- {
- .freq = 13000000,
- .enable_delay = 0x02,
- .stable_count = 0x33,
- .active_delay = 0x05,
- .xtal_freq_count = 0x7F,
- .debounce = 0x7EF4,
- },
- {
- .freq = 19200000,
- .enable_delay = 0x03,
- .stable_count = 0x4B,
- .active_delay = 0x06,
- .xtal_freq_count = 0xBB,
- .debounce = 0xBB80,
- },
- {
- .freq = 26000000,
- .enable_delay = 0x04,
- .stable_count = 0x66,
- .active_delay = 0x09,
- .xtal_freq_count = 0xFE,
- .debounce = 0xFDE8,
- },
-};
+#include "tegra2_usb_phy.h"
static struct tegra_utmip_config utmip_default[] = {
[0] = {
@@ -207,550 +54,54 @@ static struct tegra_utmip_config utmip_default[] = {
},
};
-static inline bool phy_is_ulpi(struct tegra_usb_phy *phy)
-{
- return (phy->instance == 1);
-}
-
-static int utmip_pad_open(struct tegra_usb_phy *phy)
-{
- phy->pad_clk = clk_get_sys("utmip-pad", NULL);
- if (IS_ERR(phy->pad_clk)) {
- pr_err("%s: can't get utmip pad clock\n", __func__);
- return PTR_ERR(phy->pad_clk);
- }
-
- if (phy->instance == 0) {
- phy->pad_regs = phy->regs;
- } else {
- phy->pad_regs = ioremap(TEGRA_USB_BASE, TEGRA_USB_SIZE);
- if (!phy->pad_regs) {
- pr_err("%s: can't remap usb registers\n", __func__);
- clk_put(phy->pad_clk);
- return -ENOMEM;
- }
- }
- return 0;
-}
-
-static void utmip_pad_close(struct tegra_usb_phy *phy)
-{
- if (phy->instance != 0)
- iounmap(phy->pad_regs);
- clk_put(phy->pad_clk);
-}
-
-static void utmip_pad_power_on(struct tegra_usb_phy *phy)
-{
- unsigned long val, flags;
- void __iomem *base = phy->pad_regs;
-
- clk_prepare_enable(phy->pad_clk);
-
- spin_lock_irqsave(&utmip_pad_lock, flags);
-
- if (utmip_pad_count++ == 0) {
- val = readl(base + UTMIP_BIAS_CFG0);
- val &= ~(UTMIP_OTGPD | UTMIP_BIASPD);
- writel(val, base + UTMIP_BIAS_CFG0);
- }
-
- spin_unlock_irqrestore(&utmip_pad_lock, flags);
-
- clk_disable_unprepare(phy->pad_clk);
-}
-
-static int utmip_pad_power_off(struct tegra_usb_phy *phy)
-{
- unsigned long val, flags;
- void __iomem *base = phy->pad_regs;
-
- if (!utmip_pad_count) {
- pr_err("%s: utmip pad already powered off\n", __func__);
- return -EINVAL;
- }
-
- clk_prepare_enable(phy->pad_clk);
-
- spin_lock_irqsave(&utmip_pad_lock, flags);
-
- if (--utmip_pad_count == 0) {
- val = readl(base + UTMIP_BIAS_CFG0);
- val |= UTMIP_OTGPD | UTMIP_BIASPD;
- writel(val, base + UTMIP_BIAS_CFG0);
- }
-
- spin_unlock_irqrestore(&utmip_pad_lock, flags);
-
- clk_disable_unprepare(phy->pad_clk);
-
- return 0;
-}
-
-static int utmi_wait_register(void __iomem *reg, u32 mask, u32 result)
-{
- unsigned long timeout = 2000;
- do {
- if ((readl(reg) & mask) == result)
- return 0;
- udelay(1);
- timeout--;
- } while (timeout);
- return -1;
-}
-
-static void utmi_phy_clk_disable(struct tegra_usb_phy *phy)
-{
- unsigned long val;
- void __iomem *base = phy->regs;
-
- if (phy->instance == 0) {
- val = readl(base + USB_SUSP_CTRL);
- val |= USB_SUSP_SET;
- writel(val, base + USB_SUSP_CTRL);
-
- udelay(10);
-
- val = readl(base + USB_SUSP_CTRL);
- val &= ~USB_SUSP_SET;
- writel(val, base + USB_SUSP_CTRL);
- }
-
- if (phy->instance == 2) {
- val = readl(base + USB_PORTSC1);
- val |= USB_PORTSC1_PHCD;
- writel(val, base + USB_PORTSC1);
- }
-
- if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID, 0) < 0)
- pr_err("%s: timeout waiting for phy to stabilize\n", __func__);
-}
-
-static void utmi_phy_clk_enable(struct tegra_usb_phy *phy)
-{
- unsigned long val;
- void __iomem *base = phy->regs;
-
- if (phy->instance == 0) {
- val = readl(base + USB_SUSP_CTRL);
- val |= USB_SUSP_CLR;
- writel(val, base + USB_SUSP_CTRL);
-
- udelay(10);
-
- val = readl(base + USB_SUSP_CTRL);
- val &= ~USB_SUSP_CLR;
- writel(val, base + USB_SUSP_CTRL);
- }
-
- if (phy->instance == 2) {
- val = readl(base + USB_PORTSC1);
- val &= ~USB_PORTSC1_PHCD;
- writel(val, base + USB_PORTSC1);
- }
-
- if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID,
- USB_PHY_CLK_VALID))
- pr_err("%s: timeout waiting for phy to stabilize\n", __func__);
-}
-
-static int utmi_phy_power_on(struct tegra_usb_phy *phy)
-{
- unsigned long val;
- void __iomem *base = phy->regs;
- struct tegra_utmip_config *config = phy->config;
-
- val = readl(base + USB_SUSP_CTRL);
- val |= UTMIP_RESET;
- writel(val, base + USB_SUSP_CTRL);
-
- if (phy->instance == 0) {
- val = readl(base + USB1_LEGACY_CTRL);
- val |= USB1_NO_LEGACY_MODE;
- writel(val, base + USB1_LEGACY_CTRL);
- }
-
- val = readl(base + UTMIP_TX_CFG0);
- val &= ~UTMIP_FS_PREABMLE_J;
- writel(val, base + UTMIP_TX_CFG0);
-
- val = readl(base + UTMIP_HSRX_CFG0);
- val &= ~(UTMIP_IDLE_WAIT(~0) | UTMIP_ELASTIC_LIMIT(~0));
- val |= UTMIP_IDLE_WAIT(config->idle_wait_delay);
- val |= UTMIP_ELASTIC_LIMIT(config->elastic_limit);
- writel(val, base + UTMIP_HSRX_CFG0);
-
- val = readl(base + UTMIP_HSRX_CFG1);
- val &= ~UTMIP_HS_SYNC_START_DLY(~0);
- val |= UTMIP_HS_SYNC_START_DLY(config->hssync_start_delay);
- writel(val, base + UTMIP_HSRX_CFG1);
-
- val = readl(base + UTMIP_DEBOUNCE_CFG0);
- val &= ~UTMIP_BIAS_DEBOUNCE_A(~0);
- val |= UTMIP_BIAS_DEBOUNCE_A(phy->freq->debounce);
- writel(val, base + UTMIP_DEBOUNCE_CFG0);
-
- val = readl(base + UTMIP_MISC_CFG0);
- val &= ~UTMIP_SUSPEND_EXIT_ON_EDGE;
- writel(val, base + UTMIP_MISC_CFG0);
-
- val = readl(base + UTMIP_MISC_CFG1);
- val &= ~(UTMIP_PLL_ACTIVE_DLY_COUNT(~0) | UTMIP_PLLU_STABLE_COUNT(~0));
- val |= UTMIP_PLL_ACTIVE_DLY_COUNT(phy->freq->active_delay) |
- UTMIP_PLLU_STABLE_COUNT(phy->freq->stable_count);
- writel(val, base + UTMIP_MISC_CFG1);
-
- val = readl(base + UTMIP_PLL_CFG1);
- val &= ~(UTMIP_XTAL_FREQ_COUNT(~0) | UTMIP_PLLU_ENABLE_DLY_COUNT(~0));
- val |= UTMIP_XTAL_FREQ_COUNT(phy->freq->xtal_freq_count) |
- UTMIP_PLLU_ENABLE_DLY_COUNT(phy->freq->enable_delay);
- writel(val, base + UTMIP_PLL_CFG1);
-
- if (phy->mode == TEGRA_USB_PHY_MODE_DEVICE) {
- val = readl(base + USB_SUSP_CTRL);
- val &= ~(USB_WAKE_ON_CNNT_EN_DEV | USB_WAKE_ON_DISCON_EN_DEV);
- writel(val, base + USB_SUSP_CTRL);
- }
-
- utmip_pad_power_on(phy);
-
- val = readl(base + UTMIP_XCVR_CFG0);
- val &= ~(UTMIP_FORCE_PD_POWERDOWN | UTMIP_FORCE_PD2_POWERDOWN |
- UTMIP_FORCE_PDZI_POWERDOWN | UTMIP_XCVR_SETUP(~0) |
- UTMIP_XCVR_LSFSLEW(~0) | UTMIP_XCVR_LSRSLEW(~0) |
- UTMIP_XCVR_HSSLEW_MSB(~0));
- val |= UTMIP_XCVR_SETUP(config->xcvr_setup);
- val |= UTMIP_XCVR_LSFSLEW(config->xcvr_lsfslew);
- val |= UTMIP_XCVR_LSRSLEW(config->xcvr_lsrslew);
- writel(val, base + UTMIP_XCVR_CFG0);
-
- val = readl(base + UTMIP_XCVR_CFG1);
- val &= ~(UTMIP_FORCE_PDDISC_POWERDOWN | UTMIP_FORCE_PDCHRP_POWERDOWN |
- UTMIP_FORCE_PDDR_POWERDOWN | UTMIP_XCVR_TERM_RANGE_ADJ(~0));
- val |= UTMIP_XCVR_TERM_RANGE_ADJ(config->term_range_adj);
- writel(val, base + UTMIP_XCVR_CFG1);
-
- val = readl(base + UTMIP_BAT_CHRG_CFG0);
- val &= ~UTMIP_PD_CHRG;
- writel(val, base + UTMIP_BAT_CHRG_CFG0);
-
- val = readl(base + UTMIP_BIAS_CFG1);
- val &= ~UTMIP_BIAS_PDTRK_COUNT(~0);
- val |= UTMIP_BIAS_PDTRK_COUNT(0x5);
- writel(val, base + UTMIP_BIAS_CFG1);
-
- if (phy->instance == 0) {
- val = readl(base + UTMIP_SPARE_CFG0);
- if (phy->mode == TEGRA_USB_PHY_MODE_DEVICE)
- val &= ~FUSE_SETUP_SEL;
- else
- val |= FUSE_SETUP_SEL;
- writel(val, base + UTMIP_SPARE_CFG0);
- }
-
- if (phy->instance == 2) {
- val = readl(base + USB_SUSP_CTRL);
- val |= UTMIP_PHY_ENABLE;
- writel(val, base + USB_SUSP_CTRL);
- }
-
- val = readl(base + USB_SUSP_CTRL);
- val &= ~UTMIP_RESET;
- writel(val, base + USB_SUSP_CTRL);
-
- if (phy->instance == 0) {
- val = readl(base + USB1_LEGACY_CTRL);
- val &= ~USB1_VBUS_SENSE_CTL_MASK;
- val |= USB1_VBUS_SENSE_CTL_A_SESS_VLD;
- writel(val, base + USB1_LEGACY_CTRL);
-
- val = readl(base + USB_SUSP_CTRL);
- val &= ~USB_SUSP_SET;
- writel(val, base + USB_SUSP_CTRL);
- }
-
- utmi_phy_clk_enable(phy);
-
- if (phy->instance == 2) {
- val = readl(base + USB_PORTSC1);
- val &= ~USB_PORTSC1_PTS(~0);
- writel(val, base + USB_PORTSC1);
- }
-
- return 0;
-}
-
-static int utmi_phy_power_off(struct tegra_usb_phy *phy)
-{
- unsigned long val;
- void __iomem *base = phy->regs;
-
- utmi_phy_clk_disable(phy);
-
- if (phy->mode == TEGRA_USB_PHY_MODE_DEVICE) {
- val = readl(base + USB_SUSP_CTRL);
- val &= ~USB_WAKEUP_DEBOUNCE_COUNT(~0);
- val |= USB_WAKE_ON_CNNT_EN_DEV | USB_WAKEUP_DEBOUNCE_COUNT(5);
- writel(val, base + USB_SUSP_CTRL);
- }
-
- val = readl(base + USB_SUSP_CTRL);
- val |= UTMIP_RESET;
- writel(val, base + USB_SUSP_CTRL);
-
- val = readl(base + UTMIP_BAT_CHRG_CFG0);
- val |= UTMIP_PD_CHRG;
- writel(val, base + UTMIP_BAT_CHRG_CFG0);
-
- val = readl(base + UTMIP_XCVR_CFG0);
- val |= UTMIP_FORCE_PD_POWERDOWN | UTMIP_FORCE_PD2_POWERDOWN |
- UTMIP_FORCE_PDZI_POWERDOWN;
- writel(val, base + UTMIP_XCVR_CFG0);
-
- val = readl(base + UTMIP_XCVR_CFG1);
- val |= UTMIP_FORCE_PDDISC_POWERDOWN | UTMIP_FORCE_PDCHRP_POWERDOWN |
- UTMIP_FORCE_PDDR_POWERDOWN;
- writel(val, base + UTMIP_XCVR_CFG1);
-
- return utmip_pad_power_off(phy);
-}
-
-static void utmi_phy_preresume(struct tegra_usb_phy *phy)
-{
- unsigned long val;
- void __iomem *base = phy->regs;
-
- val = readl(base + UTMIP_TX_CFG0);
- val |= UTMIP_HS_DISCON_DISABLE;
- writel(val, base + UTMIP_TX_CFG0);
-}
-
-static void utmi_phy_postresume(struct tegra_usb_phy *phy)
-{
- unsigned long val;
- void __iomem *base = phy->regs;
-
- val = readl(base + UTMIP_TX_CFG0);
- val &= ~UTMIP_HS_DISCON_DISABLE;
- writel(val, base + UTMIP_TX_CFG0);
-}
-
-static void utmi_phy_restore_start(struct tegra_usb_phy *phy,
- enum tegra_usb_phy_port_speed port_speed)
-{
- unsigned long val;
- void __iomem *base = phy->regs;
-
- val = readl(base + UTMIP_MISC_CFG0);
- val &= ~UTMIP_DPDM_OBSERVE_SEL(~0);
- if (port_speed == TEGRA_USB_PHY_PORT_SPEED_LOW)
- val |= UTMIP_DPDM_OBSERVE_SEL_FS_K;
- else
- val |= UTMIP_DPDM_OBSERVE_SEL_FS_J;
- writel(val, base + UTMIP_MISC_CFG0);
- udelay(1);
-
- val = readl(base + UTMIP_MISC_CFG0);
- val |= UTMIP_DPDM_OBSERVE;
- writel(val, base + UTMIP_MISC_CFG0);
- udelay(10);
-}
-
-static void utmi_phy_restore_end(struct tegra_usb_phy *phy)
-{
- unsigned long val;
- void __iomem *base = phy->regs;
-
- val = readl(base + UTMIP_MISC_CFG0);
- val &= ~UTMIP_DPDM_OBSERVE;
- writel(val, base + UTMIP_MISC_CFG0);
- udelay(10);
-}
-
-static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
-{
- int ret;
- unsigned long val;
- void __iomem *base = phy->regs;
- struct tegra_ulpi_config *config = phy->config;
-
- gpio_direction_output(config->reset_gpio, 0);
- msleep(5);
- gpio_direction_output(config->reset_gpio, 1);
-
- clk_prepare_enable(phy->clk);
- msleep(1);
-
- val = readl(base + USB_SUSP_CTRL);
- val |= UHSIC_RESET;
- writel(val, base + USB_SUSP_CTRL);
-
- val = readl(base + ULPI_TIMING_CTRL_0);
- val |= ULPI_OUTPUT_PINMUX_BYP | ULPI_CLKOUT_PINMUX_BYP;
- writel(val, base + ULPI_TIMING_CTRL_0);
-
- val = readl(base + USB_SUSP_CTRL);
- val |= ULPI_PHY_ENABLE;
- writel(val, base + USB_SUSP_CTRL);
-
- val = 0;
- writel(val, base + ULPI_TIMING_CTRL_1);
-
- val |= ULPI_DATA_TRIMMER_SEL(4);
- val |= ULPI_STPDIRNXT_TRIMMER_SEL(4);
- val |= ULPI_DIR_TRIMMER_SEL(4);
- writel(val, base + ULPI_TIMING_CTRL_1);
- udelay(10);
-
- val |= ULPI_DATA_TRIMMER_LOAD;
- val |= ULPI_STPDIRNXT_TRIMMER_LOAD;
- val |= ULPI_DIR_TRIMMER_LOAD;
- writel(val, base + ULPI_TIMING_CTRL_1);
-
- /* Fix VbusInvalid due to floating VBUS */
- ret = usb_phy_io_write(phy->ulpi, 0x40, 0x08);
- if (ret) {
- pr_err("%s: ulpi write failed\n", __func__);
- return ret;
- }
-
- ret = usb_phy_io_write(phy->ulpi, 0x80, 0x0B);
- if (ret) {
- pr_err("%s: ulpi write failed\n", __func__);
- return ret;
- }
-
- val = readl(base + USB_PORTSC1);
- val |= USB_PORTSC1_WKOC | USB_PORTSC1_WKDS | USB_PORTSC1_WKCN;
- writel(val, base + USB_PORTSC1);
-
- val = readl(base + USB_SUSP_CTRL);
- val |= USB_SUSP_CLR;
- writel(val, base + USB_SUSP_CTRL);
- udelay(100);
-
- val = readl(base + USB_SUSP_CTRL);
- val &= ~USB_SUSP_CLR;
- writel(val, base + USB_SUSP_CTRL);
-
- return 0;
-}
-
-static int ulpi_phy_power_off(struct tegra_usb_phy *phy)
-{
- unsigned long val;
- void __iomem *base = phy->regs;
- struct tegra_ulpi_config *config = phy->config;
-
- /* Clear WKCN/WKDS/WKOC wake-on events that can cause the USB
- * Controller to immediately bring the ULPI PHY out of low power
- */
- val = readl(base + USB_PORTSC1);
- val &= ~(USB_PORTSC1_WKOC | USB_PORTSC1_WKDS | USB_PORTSC1_WKCN);
- writel(val, base + USB_PORTSC1);
-
- clk_disable(phy->clk);
- return gpio_direction_output(config->reset_gpio, 0);
-}
-
-static int tegra_phy_init(struct usb_phy *x)
+static int tegra_phy_init(struct usb_phy *x)
{
struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
- struct tegra_ulpi_config *ulpi_config;
- int err;
- if (phy_is_ulpi(phy)) {
- ulpi_config = phy->config;
- phy->clk = clk_get_sys(NULL, ulpi_config->clk);
- if (IS_ERR(phy->clk)) {
- pr_err("%s: can't get ulpi clock\n", __func__);
- err = -ENXIO;
- goto err1;
- }
- if (!gpio_is_valid(ulpi_config->reset_gpio))
- ulpi_config->reset_gpio =
- of_get_named_gpio(phy->dev->of_node,
- "nvidia,phy-reset-gpio", 0);
- if (!gpio_is_valid(ulpi_config->reset_gpio)) {
- pr_err("%s: invalid reset gpio: %d\n", __func__,
- ulpi_config->reset_gpio);
- err = -EINVAL;
- goto err1;
- }
- gpio_request(ulpi_config->reset_gpio, "ulpi_phy_reset_b");
- gpio_direction_output(ulpi_config->reset_gpio, 0);
- phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
- phy->ulpi->io_priv = phy->regs + ULPI_VIEWPORT;
- } else {
- err = utmip_pad_open(phy);
- if (err < 0)
- goto err1;
- }
- return 0;
-err1:
- clk_disable_unprepare(phy->pll_u);
- clk_put(phy->pll_u);
- return err;
+ return phy->ops.open(phy);
}
static void tegra_usb_phy_close(struct usb_phy *x)
{
struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
- if (phy_is_ulpi(phy))
- clk_put(phy->clk);
- else
- utmip_pad_close(phy);
- clk_disable_unprepare(phy->pll_u);
- clk_put(phy->pll_u);
- kfree(phy);
-}
-
-static int tegra_usb_phy_power_on(struct tegra_usb_phy *phy)
-{
- if (phy_is_ulpi(phy))
- return ulpi_phy_power_on(phy);
- else
- return utmi_phy_power_on(phy);
-}
-
-static int tegra_usb_phy_power_off(struct tegra_usb_phy *phy)
-{
- if (phy_is_ulpi(phy))
- return ulpi_phy_power_off(phy);
- else
- return utmi_phy_power_off(phy);
+ phy->ops.close(phy);
}
static int tegra_usb_phy_suspend(struct usb_phy *x, int suspend)
{
struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
- if (suspend)
- return tegra_usb_phy_power_off(phy);
- else
- return tegra_usb_phy_power_on(phy);
+
+ if (suspend) {
+ if (phy->ops.power_off)
+ return phy->ops.power_off(phy);
+ } else if (phy->ops.power_on)
+ return phy->ops.power_on(phy);
+
+ return 0;
}
struct tegra_usb_phy *tegra_usb_phy_open(struct device *dev, int instance,
- void __iomem *regs, void *config, enum tegra_usb_phy_mode phy_mode)
+ void __iomem *regs, struct phy_params *params)
{
struct tegra_usb_phy *phy;
unsigned long parent_rate;
int i;
int err;
- phy = kmalloc(sizeof(struct tegra_usb_phy), GFP_KERNEL);
+ phy = devm_kzalloc(dev, sizeof(struct tegra_usb_phy), GFP_KERNEL);
if (!phy)
return ERR_PTR(-ENOMEM);
phy->instance = instance;
phy->regs = regs;
- phy->config = config;
- phy->mode = phy_mode;
+ phy->config = params->config;
+ phy->mode = params->mode;
phy->dev = dev;
+ phy->type = params->type;
if (!phy->config) {
- if (phy_is_ulpi(phy)) {
+ if (params->type == TEGRA_USB_PHY_TYPE_ULPI) {
pr_err("%s: ulpi phy configuration missing", __func__);
err = -EINVAL;
goto err0;
@@ -780,6 +131,12 @@ struct tegra_usb_phy *tegra_usb_phy_open(struct device *dev, int instance,
goto err1;
}
+ err = tegra2_usb_phy_init(phy);
+ if (err < 0) {
+ pr_err("phy type %d is not supported\n", phy->type);
+ goto err1;
+ }
+
phy->u_phy.init = tegra_phy_init;
phy->u_phy.shutdown = tegra_usb_phy_close;
phy->u_phy.set_suspend = tegra_usb_phy_suspend;
@@ -790,50 +147,35 @@ err1:
clk_disable_unprepare(phy->pll_u);
clk_put(phy->pll_u);
err0:
- kfree(phy);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(tegra_usb_phy_open);
void tegra_usb_phy_preresume(struct tegra_usb_phy *phy)
{
- if (!phy_is_ulpi(phy))
- utmi_phy_preresume(phy);
+ if (phy->ops.preresume)
+ phy->ops.preresume(phy);
}
EXPORT_SYMBOL_GPL(tegra_usb_phy_preresume);
void tegra_usb_phy_postresume(struct tegra_usb_phy *phy)
{
- if (!phy_is_ulpi(phy))
- utmi_phy_postresume(phy);
+ if (phy->ops.postresume)
+ phy->ops.postresume(phy);
}
EXPORT_SYMBOL_GPL(tegra_usb_phy_postresume);
void tegra_ehci_phy_restore_start(struct tegra_usb_phy *phy,
enum tegra_usb_phy_port_speed port_speed)
{
- if (!phy_is_ulpi(phy))
- utmi_phy_restore_start(phy, port_speed);
+ if (phy->ops.restore_start)
+ phy->ops.restore_start(phy, port_speed);
}
EXPORT_SYMBOL_GPL(tegra_ehci_phy_restore_start);
void tegra_ehci_phy_restore_end(struct tegra_usb_phy *phy)
{
- if (!phy_is_ulpi(phy))
- utmi_phy_restore_end(phy);
+ if (phy->ops.restore_end)
+ phy->ops.restore_end(phy);
}
EXPORT_SYMBOL_GPL(tegra_ehci_phy_restore_end);
-
-void tegra_usb_phy_clk_disable(struct tegra_usb_phy *phy)
-{
- if (!phy_is_ulpi(phy))
- utmi_phy_clk_disable(phy);
-}
-EXPORT_SYMBOL_GPL(tegra_usb_phy_clk_disable);
-
-void tegra_usb_phy_clk_enable(struct tegra_usb_phy *phy)
-{
- if (!phy_is_ulpi(phy))
- utmi_phy_clk_enable(phy);
-}
-EXPORT_SYMBOL_GPL(tegra_usb_phy_clk_enable);
diff --git a/include/linux/usb/tegra_usb_phy.h b/include/linux/usb/tegra_usb_phy.h
index 176b1ca..c27705b 100644
--- a/include/linux/usb/tegra_usb_phy.h
+++ b/include/linux/usb/tegra_usb_phy.h
@@ -44,8 +44,34 @@ enum tegra_usb_phy_mode {
TEGRA_USB_PHY_MODE_HOST,
};
+enum tegra_usb_phy_type {
+ TEGRA_USB_PHY_TYPE_UTMI = 0,
+ TEGRA_USB_PHY_TYPE_ULPI,
+ TEGRA_USB_PHY_TYPE_INVALID,
+};
+
+struct tegra_usb_phy;
+
+struct usb_phy_ops {
+ int (*open)(struct tegra_usb_phy *phy);
+ void (*close)(struct tegra_usb_phy *phy);
+ int (*power_on)(struct tegra_usb_phy *phy);
+ int (*power_off)(struct tegra_usb_phy *phy);
+ void (*preresume)(struct tegra_usb_phy *phy);
+ void (*postresume)(struct tegra_usb_phy *phy);
+ void (*restore_start)(struct tegra_usb_phy *phy,
+ enum tegra_usb_phy_port_speed port_speed);
+ void (*restore_end)(struct tegra_usb_phy *phy);
+};
+
struct tegra_xtal_freq;
+struct phy_params {
+ void *config;
+ enum tegra_usb_phy_mode mode;
+ enum tegra_usb_phy_type type;
+};
+
struct tegra_usb_phy {
int instance;
const struct tegra_xtal_freq *freq;
@@ -58,15 +84,13 @@ struct tegra_usb_phy {
void *config;
struct usb_phy *ulpi;
struct usb_phy u_phy;
+ struct usb_phy_ops ops;
+ enum tegra_usb_phy_type type;
struct device *dev;
};
struct tegra_usb_phy *tegra_usb_phy_open(struct device *dev, int instance,
- void __iomem *regs, void *config, enum tegra_usb_phy_mode phy_mode);
-
-void tegra_usb_phy_clk_disable(struct tegra_usb_phy *phy);
-
-void tegra_usb_phy_clk_enable(struct tegra_usb_phy *phy);
+ void __iomem *regs, struct phy_params *params);
void tegra_usb_phy_preresume(struct tegra_usb_phy *phy);
--
1.7.1.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] USB: phy: re-organize tegra phy driver
2012-09-12 10:58 [PATCH] USB: phy: re-organize tegra phy driver Venu Byravarasu
@ 2012-09-12 18:36 ` Stephen Warren
2012-09-13 3:49 ` Venu Byravarasu
2012-09-13 4:16 ` Venu Byravarasu
0 siblings, 2 replies; 6+ messages in thread
From: Stephen Warren @ 2012-09-12 18:36 UTC (permalink / raw)
To: Venu Byravarasu; +Cc: balbi, linux-kernel, linux-usb, linux-tegra
On 09/12/2012 04:58 AM, Venu Byravarasu wrote:
> Nvidia produces several Tegra SOCs viz Tegra2, Tegra3 etc.
> In order to support USB phy drivers on these SOCs, existing
> phy driver is split into SOC agnostic common USB phy driver and
> tegra2 specific USB phy driver.
> This will facilitate easy addition & deletion of phy drivers for
> Tegra SOCs.
For capitalization/related reasons, I would re-write the commit
description as:
NVIDIA produces several Tegra SoCs viz Tegra20, Tegra30 etc.
In order to support USB PHY drivers on these SoCs, existing
PHY driver is split into SoC agnostic common USB PHY driver and
Tegra20-specific USB phy driver. This will facilitate easy addition
and deletion of phy drivers for Tegra SoCs.
... and s/tegra/Tegra/ in the patch subject.
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
(On Harmony, both the USB Ethernet on USB3/UTMI and USB2's ULPI to a
breakout board)
> diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
> @@ -706,9 +709,22 @@ static int tegra_ehci_probe(struct platform_device *pdev)
> }
> }
>
> + phy_type = of_property_match_string(np, "phy_type", "utmi");
> + if (phy_type >= 0)
> + params.type = TEGRA_USB_PHY_TYPE_UTMI;
> + else {
> + phy_type = of_property_match_string(np, "phy_type", "ulpi");
> + if (phy_type >= 0)
> + params.type = TEGRA_USB_PHY_TYPE_ULPI;
> + else
> + params.type = TEGRA_USB_PHY_TYPE_INVALID;
> + }
> +
> + params.mode = TEGRA_USB_PHY_MODE_HOST;
Do we not support device mode yet? There's a dr_mode property in the DT
that's supposed to indicate host/device/otg.
> diff --git a/drivers/usb/phy/tegra2_usb_phy.c b/drivers/usb/phy/tegra2_usb_phy.c
> +#include <mach/gpio-tegra.h>
Please remove that #include statement; the heaer is not needed, and will
be deleted in the kernel 3.7 merge window.
> +static int tegra2_utmip_pad_open(struct tegra_usb_phy *phy)
> +{
> + phy->pad_clk = clk_get_sys("utmip-pad", NULL);
> + if (IS_ERR(phy->pad_clk)) {
> + pr_err("%s: can't get utmip pad clock\n", __func__);
> + return PTR_ERR(phy->pad_clk);
> + }
> +
> + if (phy->instance == 0) {
> + phy->pad_regs = phy->regs;
> + } else {
Can we use something other than phy->instance here? I see lots of usage
of this field, but we should really be deleting the following code from
ehci-tegra.c, rather the propagating the use of that field.
/* This is pretty ugly and needs to be fixed when we do only
* device-tree probing. Old code relies on the platform_device
* numbering that we lack for device-tree-instantiated devices.
*/
if (instance < 0) {
switch (res->start) {
case TEGRA_USB_BASE:
instance = 0;
break;
case TEGRA_USB2_BASE:
instance = 1;
break;
case TEGRA_USB3_BASE:
instance = 2;
break;
default:
err = -ENODEV;
dev_err(&pdev->dev, "unknown usb instance\n");
goto fail_io;
}
}
Still, I suppose the cleanup not to use the instance value could be a
later patch as long as you're aware of the issue and planning to solve it.
> + phy->pad_regs = ioremap(TEGRA_USB_BASE, TEGRA_USB_SIZE);
Hmmm. Why do we need to remap the registers again? Didn't the EHCI
controller already map them? I'm a little confused what in HW causes the
need for this whole if statement.
> + if (!phy->pad_regs) {
> + pr_err("%s: can't remap usb registers\n", __func__);
> + clk_put(phy->pad_clk);
> + return -ENOMEM;
> + }
> + }
> +static void tegra2_utmi_phy_clk_disable(struct tegra_usb_phy *phy)
> +{
> + unsigned long val;
> + void __iomem *base = phy->regs;
> +
> + if (phy->instance == 0) {
Hmmm. There sure are a lot of places where the code is conditional based
on instance. This seems to be crying out to be split into more ops
functions that get set up once at probe() time and then just used.
> +static int tegra2_utmi_phy_power_off(struct tegra_usb_phy *phy)
> +{
> + unsigned long val;
> + void __iomem *base = phy->regs;
> +
> + tegra2_utmi_phy_clk_disable(phy);
> +
> + if (phy->mode == TEGRA_USB_PHY_MODE_DEVICE) {
Hmm. Yet here, we have some support for device-mode.
> +static int tegra2_usb_phy_open(struct tegra_usb_phy *phy)
> +{
> + struct tegra_ulpi_config *ulpi_config;
> + int err;
> +
> + if (phy_is_ulpi(phy)) {
Similarly, this seems like it'd be better as two separate functions,
since there's already an op defined for open.
> + ulpi_config = phy->config;
> + phy->clk = clk_get_sys(NULL, ulpi_config->clk);
> + if (IS_ERR(phy->clk)) {
> + pr_err("%s: can't get ulpi clock\n", __func__);
> + err = -ENXIO;
> + goto err1;
> + }
> + if (!gpio_is_valid(ulpi_config->reset_gpio))
> + ulpi_config->reset_gpio =
> + of_get_named_gpio(phy->dev->of_node,
> + "nvidia,phy-reset-gpio", 0);
> + if (!gpio_is_valid(ulpi_config->reset_gpio)) {
> + pr_err("%s: invalid reset gpio: %d\n", __func__,
> + ulpi_config->reset_gpio);
> + err = -EINVAL;
> + goto err1;
> + }
> + gpio_request(ulpi_config->reset_gpio, "ulpi_phy_reset_b");
> + gpio_direction_output(ulpi_config->reset_gpio, 0);
> + phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
> + phy->ulpi->io_priv = phy->regs + ULPI_VIEWPORT;
> + } else {
> + err = tegra2_utmip_pad_open(phy);
> + if (err < 0)
> + goto err1;
> + }
> + return 0;
> +err1:
> + clk_disable_unprepare(phy->pll_u);
> + clk_put(phy->pll_u);
In the else clause above, phy->pll_u was never assigned, yet failure
jumps here...
> + return err;
> +}
> diff --git a/drivers/usb/phy/tegra2_usb_phy.h b/drivers/usb/phy/tegra2_usb_phy.h
> +static const struct tegra_xtal_freq tegra_freq_table[] = {
> + {
> + .freq = 12000000,
> + .enable_delay = 0x02,
...
It doesn't seem like a good idea to put data into a header file.
> diff --git a/include/linux/usb/tegra_usb_phy.h b/include/linux/usb/tegra_usb_phy.h
> +struct usb_phy_ops {
Shouldn't that be tegra_usb_phy_ops to avoid namespace collisions?
^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: [PATCH] USB: phy: re-organize tegra phy driver
2012-09-12 18:36 ` Stephen Warren
@ 2012-09-13 3:49 ` Venu Byravarasu
2012-09-13 4:36 ` Stephen Warren
2012-09-13 4:16 ` Venu Byravarasu
1 sibling, 1 reply; 6+ messages in thread
From: Venu Byravarasu @ 2012-09-13 3:49 UTC (permalink / raw)
To: Stephen Warren; +Cc: balbi, linux-kernel, linux-usb, linux-tegra
> -----Original Message-----
> From: Stephen Warren [mailto:swarren@wwwdotorg.org]
> Sent: Thursday, September 13, 2012 12:06 AM
> To: Venu Byravarasu
> Cc: balbi@ti.com; linux-kernel@vger.kernel.org; linux-usb@vger.kernel.org;
> linux-tegra@vger.kernel.org
> Subject: Re: [PATCH] USB: phy: re-organize tegra phy driver
>
> On 09/12/2012 04:58 AM, Venu Byravarasu wrote:
> > Nvidia produces several Tegra SOCs viz Tegra2, Tegra3 etc.
> > In order to support USB phy drivers on these SOCs, existing
> > phy driver is split into SOC agnostic common USB phy driver and
> > tegra2 specific USB phy driver.
> > This will facilitate easy addition & deletion of phy drivers for
> > Tegra SOCs.
>
> For capitalization/related reasons, I would re-write the commit
> description as:
>
> NVIDIA produces several Tegra SoCs viz Tegra20, Tegra30 etc.
> In order to support USB PHY drivers on these SoCs, existing
Will change tegra2 to Tegra20 and similar for Tegra30 & NVIDIA.
However as phy is not an acronym, should we still have it in Caps?
> PHY driver is split into SoC agnostic common USB PHY driver and
> Tegra20-specific USB phy driver. This will facilitate easy addition
> and deletion of phy drivers for Tegra SoCs.
>
> ... and s/tegra/Tegra/ in the patch subject.
>
> Tested-by: Stephen Warren <swarren@wwwdotorg.org>
>
> (On Harmony, both the USB Ethernet on USB3/UTMI and USB2's ULPI to a
> breakout board)
>
> > diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
>
> > @@ -706,9 +709,22 @@ static int tegra_ehci_probe(struct platform_device
> *pdev)
> > }
> > }
> >
> > + phy_type = of_property_match_string(np, "phy_type", "utmi");
> > + if (phy_type >= 0)
> > + params.type = TEGRA_USB_PHY_TYPE_UTMI;
> > + else {
> > + phy_type = of_property_match_string(np, "phy_type",
> "ulpi");
> > + if (phy_type >= 0)
> > + params.type = TEGRA_USB_PHY_TYPE_ULPI;
> > + else
> > + params.type = TEGRA_USB_PHY_TYPE_INVALID;
> > + }
> > +
> > + params.mode = TEGRA_USB_PHY_MODE_HOST;
>
> Do we not support device mode yet? There's a dr_mode property in the DT
> that's supposed to indicate host/device/otg.
>
> > diff --git a/drivers/usb/phy/tegra2_usb_phy.c
> b/drivers/usb/phy/tegra2_usb_phy.c
>
> > +#include <mach/gpio-tegra.h>
>
> Please remove that #include statement; the heaer is not needed, and will
> be deleted in the kernel 3.7 merge window.
>
> > +static int tegra2_utmip_pad_open(struct tegra_usb_phy *phy)
> > +{
> > + phy->pad_clk = clk_get_sys("utmip-pad", NULL);
> > + if (IS_ERR(phy->pad_clk)) {
> > + pr_err("%s: can't get utmip pad clock\n", __func__);
> > + return PTR_ERR(phy->pad_clk);
> > + }
> > +
> > + if (phy->instance == 0) {
> > + phy->pad_regs = phy->regs;
> > + } else {
>
> Can we use something other than phy->instance here? I see lots of usage
> of this field, but we should really be deleting the following code from
> ehci-tegra.c, rather the propagating the use of that field.
>
> /* This is pretty ugly and needs to be fixed when we do only
> * device-tree probing. Old code relies on the platform_device
> * numbering that we lack for device-tree-instantiated devices.
> */
> if (instance < 0) {
> switch (res->start) {
> case TEGRA_USB_BASE:
> instance = 0;
> break;
> case TEGRA_USB2_BASE:
> instance = 1;
> break;
> case TEGRA_USB3_BASE:
> instance = 2;
> break;
> default:
> err = -ENODEV;
> dev_err(&pdev->dev, "unknown usb instance\n");
> goto fail_io;
> }
> }
>
> Still, I suppose the cleanup not to use the instance value could be a
> later patch as long as you're aware of the issue and planning to solve it.
>
> > + phy->pad_regs = ioremap(TEGRA_USB_BASE,
> TEGRA_USB_SIZE);
>
> Hmmm. Why do we need to remap the registers again? Didn't the EHCI
> controller already map them? I'm a little confused what in HW causes the
> need for this whole if statement.
>
> > + if (!phy->pad_regs) {
> > + pr_err("%s: can't remap usb registers\n", __func__);
> > + clk_put(phy->pad_clk);
> > + return -ENOMEM;
> > + }
> > + }
>
> > +static void tegra2_utmi_phy_clk_disable(struct tegra_usb_phy *phy)
> > +{
> > + unsigned long val;
> > + void __iomem *base = phy->regs;
> > +
> > + if (phy->instance == 0) {
>
> Hmmm. There sure are a lot of places where the code is conditional based
> on instance. This seems to be crying out to be split into more ops
> functions that get set up once at probe() time and then just used.
>
> > +static int tegra2_utmi_phy_power_off(struct tegra_usb_phy *phy)
> > +{
> > + unsigned long val;
> > + void __iomem *base = phy->regs;
> > +
> > + tegra2_utmi_phy_clk_disable(phy);
> > +
> > + if (phy->mode == TEGRA_USB_PHY_MODE_DEVICE) {
>
> Hmm. Yet here, we have some support for device-mode.
>
> > +static int tegra2_usb_phy_open(struct tegra_usb_phy *phy)
> > +{
> > + struct tegra_ulpi_config *ulpi_config;
> > + int err;
> > +
> > + if (phy_is_ulpi(phy)) {
>
> Similarly, this seems like it'd be better as two separate functions,
> since there's already an op defined for open.
>
> > + ulpi_config = phy->config;
> > + phy->clk = clk_get_sys(NULL, ulpi_config->clk);
> > + if (IS_ERR(phy->clk)) {
> > + pr_err("%s: can't get ulpi clock\n", __func__);
> > + err = -ENXIO;
> > + goto err1;
> > + }
> > + if (!gpio_is_valid(ulpi_config->reset_gpio))
> > + ulpi_config->reset_gpio =
> > + of_get_named_gpio(phy->dev->of_node,
> > + "nvidia,phy-reset-gpio", 0);
> > + if (!gpio_is_valid(ulpi_config->reset_gpio)) {
> > + pr_err("%s: invalid reset gpio: %d\n", __func__,
> > + ulpi_config->reset_gpio);
> > + err = -EINVAL;
> > + goto err1;
> > + }
> > + gpio_request(ulpi_config->reset_gpio, "ulpi_phy_reset_b");
> > + gpio_direction_output(ulpi_config->reset_gpio, 0);
> > + phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
> > + phy->ulpi->io_priv = phy->regs + ULPI_VIEWPORT;
> > + } else {
> > + err = tegra2_utmip_pad_open(phy);
> > + if (err < 0)
> > + goto err1;
> > + }
> > + return 0;
> > +err1:
> > + clk_disable_unprepare(phy->pll_u);
> > + clk_put(phy->pll_u);
>
> In the else clause above, phy->pll_u was never assigned, yet failure
> jumps here...
>
> > + return err;
> > +}
>
> > diff --git a/drivers/usb/phy/tegra2_usb_phy.h
> b/drivers/usb/phy/tegra2_usb_phy.h
>
> > +static const struct tegra_xtal_freq tegra_freq_table[] = {
> > + {
> > + .freq = 12000000,
> > + .enable_delay = 0x02,
> ...
>
> It doesn't seem like a good idea to put data into a header file.
>
> > diff --git a/include/linux/usb/tegra_usb_phy.h
> b/include/linux/usb/tegra_usb_phy.h
>
> > +struct usb_phy_ops {
>
> Shouldn't that be tegra_usb_phy_ops to avoid namespace collisions?
^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: [PATCH] USB: phy: re-organize tegra phy driver
2012-09-12 18:36 ` Stephen Warren
2012-09-13 3:49 ` Venu Byravarasu
@ 2012-09-13 4:16 ` Venu Byravarasu
2012-09-13 4:34 ` Stephen Warren
1 sibling, 1 reply; 6+ messages in thread
From: Venu Byravarasu @ 2012-09-13 4:16 UTC (permalink / raw)
To: Stephen Warren; +Cc: balbi, linux-kernel, linux-usb, linux-tegra
Forgot to address some of the comments made by stephen, in my previous update.
Hence addressing them now.
Thanks a lot Stephen, for detailed review.
> -----Original Message-----
> From: Stephen Warren [mailto:swarren@wwwdotorg.org]
> Sent: Thursday, September 13, 2012 12:06 AM
> To: Venu Byravarasu
> Cc: balbi@ti.com; linux-kernel@vger.kernel.org; linux-usb@vger.kernel.org;
> linux-tegra@vger.kernel.org
> Subject: Re: [PATCH] USB: phy: re-organize tegra phy driver
>
> On 09/12/2012 04:58 AM, Venu Byravarasu wrote:
> > Nvidia produces several Tegra SOCs viz Tegra2, Tegra3 etc.
> > In order to support USB phy drivers on these SOCs, existing
> > phy driver is split into SOC agnostic common USB phy driver and
> > tegra2 specific USB phy driver.
> > This will facilitate easy addition & deletion of phy drivers for
> > Tegra SOCs.
>
> For capitalization/related reasons, I would re-write the commit
> description as:
>
> NVIDIA produces several Tegra SoCs viz Tegra20, Tegra30 etc.
> In order to support USB PHY drivers on these SoCs, existing
> PHY driver is split into SoC agnostic common USB PHY driver and
> Tegra20-specific USB phy driver. This will facilitate easy addition
> and deletion of phy drivers for Tegra SoCs.
>
> ... and s/tegra/Tegra/ in the patch subject.
>
> Tested-by: Stephen Warren <swarren@wwwdotorg.org>
>
> (On Harmony, both the USB Ethernet on USB3/UTMI and USB2's ULPI to a
> breakout board)
>
> > diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
>
> > @@ -706,9 +709,22 @@ static int tegra_ehci_probe(struct platform_device
> *pdev)
> > }
> > }
> >
> > + phy_type = of_property_match_string(np, "phy_type", "utmi");
> > + if (phy_type >= 0)
> > + params.type = TEGRA_USB_PHY_TYPE_UTMI;
> > + else {
> > + phy_type = of_property_match_string(np, "phy_type",
> "ulpi");
> > + if (phy_type >= 0)
> > + params.type = TEGRA_USB_PHY_TYPE_ULPI;
> > + else
> > + params.type = TEGRA_USB_PHY_TYPE_INVALID;
> > + }
> > +
> > + params.mode = TEGRA_USB_PHY_MODE_HOST;
>
> Do we not support device mode yet? There's a dr_mode property in the DT
> that's supposed to indicate host/device/otg.
>
Device & otg support will be added soon.
> > diff --git a/drivers/usb/phy/tegra2_usb_phy.c
> b/drivers/usb/phy/tegra2_usb_phy.c
>
> > +#include <mach/gpio-tegra.h>
>
> Please remove that #include statement; the heaer is not needed, and will
> be deleted in the kernel 3.7 merge window.
Sure, will remove it.
>
> > +static int tegra2_utmip_pad_open(struct tegra_usb_phy *phy)
> > +{
> > + phy->pad_clk = clk_get_sys("utmip-pad", NULL);
> > + if (IS_ERR(phy->pad_clk)) {
> > + pr_err("%s: can't get utmip pad clock\n", __func__);
> > + return PTR_ERR(phy->pad_clk);
> > + }
> > +
> > + if (phy->instance == 0) {
> > + phy->pad_regs = phy->regs;
> > + } else {
>
> Can we use something other than phy->instance here? I see lots of usage
> of this field, but we should really be deleting the following code from
> ehci-tegra.c, rather the propagating the use of that field.
I too feel the same way.
Planning to address it in next patches.
>
> /* This is pretty ugly and needs to be fixed when we do only
> * device-tree probing. Old code relies on the platform_device
> * numbering that we lack for device-tree-instantiated devices.
> */
> if (instance < 0) {
> switch (res->start) {
> case TEGRA_USB_BASE:
> instance = 0;
> break;
> case TEGRA_USB2_BASE:
> instance = 1;
> break;
> case TEGRA_USB3_BASE:
> instance = 2;
> break;
> default:
> err = -ENODEV;
> dev_err(&pdev->dev, "unknown usb instance\n");
> goto fail_io;
> }
> }
>
> Still, I suppose the cleanup not to use the instance value could be a
> later patch as long as you're aware of the issue and planning to solve it.
Yes, planning to address it in next patches.
>
> > + phy->pad_regs = ioremap(TEGRA_USB_BASE,
> TEGRA_USB_SIZE);
>
> Hmmm. Why do we need to remap the registers again? Didn't the EHCI
> controller already map them? I'm a little confused what in HW causes the
> need for this whole if statement.
>
In order to have very minimal changes in the patch, I did not clean this up.
This was taken from old code, which is yet to be cleaned up.
This patch just moves tegra2 specific code from single phy driver to tegra2_usb_phy.c
Will address all clean up stuff in next patches.
> > + if (!phy->pad_regs) {
> > + pr_err("%s: can't remap usb registers\n", __func__);
> > + clk_put(phy->pad_clk);
> > + return -ENOMEM;
> > + }
> > + }
>
> > +static void tegra2_utmi_phy_clk_disable(struct tegra_usb_phy *phy)
> > +{
> > + unsigned long val;
> > + void __iomem *base = phy->regs;
> > +
> > + if (phy->instance == 0) {
>
> Hmmm. There sure are a lot of places where the code is conditional based
> on instance. This seems to be crying out to be split into more ops
> functions that get set up once at probe() time and then just used.
As mentioned already, can address all clean up stuff in other patch.
>
> > +static int tegra2_utmi_phy_power_off(struct tegra_usb_phy *phy)
> > +{
> > + unsigned long val;
> > + void __iomem *base = phy->regs;
> > +
> > + tegra2_utmi_phy_clk_disable(phy);
> > +
> > + if (phy->mode == TEGRA_USB_PHY_MODE_DEVICE) {
>
> Hmm. Yet here, we have some support for device-mode.
Complete device support will be added soon.
This is from the old code.
>
> > +static int tegra2_usb_phy_open(struct tegra_usb_phy *phy)
> > +{
> > + struct tegra_ulpi_config *ulpi_config;
> > + int err;
> > +
> > + if (phy_is_ulpi(phy)) {
>
> Similarly, this seems like it'd be better as two separate functions,
> since there's already an op defined for open.
tegra2_usb_phy_open is called via open of ops only.
Plz let me know if you still have any concern here.
>
> > + ulpi_config = phy->config;
> > + phy->clk = clk_get_sys(NULL, ulpi_config->clk);
> > + if (IS_ERR(phy->clk)) {
> > + pr_err("%s: can't get ulpi clock\n", __func__);
> > + err = -ENXIO;
> > + goto err1;
> > + }
> > + if (!gpio_is_valid(ulpi_config->reset_gpio))
> > + ulpi_config->reset_gpio =
> > + of_get_named_gpio(phy->dev->of_node,
> > + "nvidia,phy-reset-gpio", 0);
> > + if (!gpio_is_valid(ulpi_config->reset_gpio)) {
> > + pr_err("%s: invalid reset gpio: %d\n", __func__,
> > + ulpi_config->reset_gpio);
> > + err = -EINVAL;
> > + goto err1;
> > + }
> > + gpio_request(ulpi_config->reset_gpio, "ulpi_phy_reset_b");
> > + gpio_direction_output(ulpi_config->reset_gpio, 0);
> > + phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
> > + phy->ulpi->io_priv = phy->regs + ULPI_VIEWPORT;
> > + } else {
> > + err = tegra2_utmip_pad_open(phy);
> > + if (err < 0)
> > + goto err1;
> > + }
> > + return 0;
> > +err1:
> > + clk_disable_unprepare(phy->pll_u);
> > + clk_put(phy->pll_u);
>
> In the else clause above, phy->pll_u was never assigned, yet failure
> jumps here...
Thanks for pointing this out.
As I mentioned earlier, this was all taken from old code.
Any how will fix this in my next patch.
>
> > + return err;
> > +}
>
> > diff --git a/drivers/usb/phy/tegra2_usb_phy.h
> b/drivers/usb/phy/tegra2_usb_phy.h
>
> > +static const struct tegra_xtal_freq tegra_freq_table[] = {
> > + {
> > + .freq = 12000000,
> > + .enable_delay = 0x02,
> ...
>
> It doesn't seem like a good idea to put data into a header file.
Fine, will try moving it to implementation.
> > diff --git a/include/linux/usb/tegra_usb_phy.h
> b/include/linux/usb/tegra_usb_phy.h
>
> > +struct usb_phy_ops {
>
> Shouldn't that be tegra_usb_phy_ops to avoid namespace collisions?
Sure, will rename it.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] USB: phy: re-organize tegra phy driver
2012-09-13 4:16 ` Venu Byravarasu
@ 2012-09-13 4:34 ` Stephen Warren
0 siblings, 0 replies; 6+ messages in thread
From: Stephen Warren @ 2012-09-13 4:34 UTC (permalink / raw)
To: Venu Byravarasu; +Cc: balbi, linux-kernel, linux-usb, linux-tegra
On 09/12/2012 10:16 PM, Venu Byravarasu wrote:
> Forgot to address some of the comments made by stephen, in my previous update.
> Hence addressing them now.
> Thanks a lot Stephen, for detailed review.
OK, so since this patch is basically just splitting the file into
multiple parts, you can ignore most of my review comments for this patch
and consider them as input for things in future cleanup patches.
One comment below:
> Stephen Warren wrote at Thursday, September 13, 2012 12:06 AM:
>> On 09/12/2012 04:58 AM, Venu Byravarasu wrote:
...
>>> +static int tegra2_usb_phy_open(struct tegra_usb_phy *phy)
>>> +{
>>> + struct tegra_ulpi_config *ulpi_config;
>>> + int err;
>>> +
>>> + if (phy_is_ulpi(phy)) {
>>
>> Similarly, this seems like it'd be better as two separate functions,
>> since there's already an op defined for open.
>
> tegra2_usb_phy_open is called via open of ops only.
> Plz let me know if you still have any concern here.
What I meant was the body of this function is:
tegra2_usb_phy_open:
if (ulpi)
do a bunch of ULPI stuff
else
do a bunch of UTMI stuff
It's seems it'd be simpler to split this into two functions:
tegra2_usb_ulpi_phy_open:
do a bunch of ULPI stuff
tegra2_usb_utmi_phy_open:
do a bunch of UTMI stuff
... and have the code that initializes the ops assign the appropriate
one of those two functions into the open op, just like it does for
all/most other ops.
Still, this may come under the same argument as above; fuel for future
cleanup since the existing code already works this way?
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] USB: phy: re-organize tegra phy driver
2012-09-13 3:49 ` Venu Byravarasu
@ 2012-09-13 4:36 ` Stephen Warren
0 siblings, 0 replies; 6+ messages in thread
From: Stephen Warren @ 2012-09-13 4:36 UTC (permalink / raw)
To: Venu Byravarasu; +Cc: balbi, linux-kernel, linux-usb, linux-tegra
On 09/12/2012 09:49 PM, Venu Byravarasu wrote:
> Stephen Warren wrote at Thursday, September 13, 2012 12:06 AM:
>> On 09/12/2012 04:58 AM, Venu Byravarasu wrote:
>>> Nvidia produces several Tegra SOCs viz Tegra2, Tegra3 etc.
>>> In order to support USB phy drivers on these SOCs, existing
>>> phy driver is split into SOC agnostic common USB phy driver and
>>> tegra2 specific USB phy driver.
>>> This will facilitate easy addition & deletion of phy drivers for
>>> Tegra SOCs.
>>
>> For capitalization/related reasons, I would re-write the commit
>> description as:
>>
>> NVIDIA produces several Tegra SoCs viz Tegra20, Tegra30 etc.
>> In order to support USB PHY drivers on these SoCs, existing
>
> Will change tegra2 to Tegra20 and similar for Tegra30 & NVIDIA.
> However as phy is not an acronym, should we still have it in Caps?
I'd certainly expect to see PHY in all-caps, yes. As entirely arbitrary
justification, see the precedent at:
https://en.wikipedia.org/wiki/PHY_(chip)
Sorry for bike-shedding, but I'm picky about that kind of thing, at
least sometimes.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-09-13 4:36 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-09-12 10:58 [PATCH] USB: phy: re-organize tegra phy driver Venu Byravarasu
2012-09-12 18:36 ` Stephen Warren
2012-09-13 3:49 ` Venu Byravarasu
2012-09-13 4:36 ` Stephen Warren
2012-09-13 4:16 ` Venu Byravarasu
2012-09-13 4:34 ` Stephen Warren
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