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usb: phy: tegra: Tegra30 support

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The Tegra30 USB PHY is a bit different than the Tegra20 PHY:

- The EHCI controller supports the HOSTPC register extension, and some
  of the fields that the PHY needs to modify (PHCD and PTS) have moved
  to the new HOSTPC register.
- Some of the UTMI PLL configuration registers have moved from the USB
  register space to the Clock-And-Reset controller space. In Tegra30
  the clock driver is responsible for configuring the UTMI PLL.
- The USBMODE register must be explicitly written to enter host mode.
- Certain PHY parameters need to be programmed for optimal signal
  quality. Support for this will be added in the next patch.

The new tegra_phy_soc_config structure is added to describe the
differences between the SoCs.

Signed-off-by: Tuomas Tynkkynen <ttynkkynen@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Tuomas Tynkkynen 2013-08-12 16:06:51 +03:00 committed by Felipe Balbi
parent f5833a0bde
commit 3e635202ce
2 changed files with 111 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

119
drivers/usb/phy/phy-tegra-usb.c
View File

@ -28,6 +28,7 @@
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
@ -39,11 +40,16 @@
#define ULPI_VIEWPORT 0x170
/* PORTSC registers */
/* PORTSC PTS/PHCD bits, Tegra20 only */
#define TEGRA_USB_PORTSC1 0x184
#define TEGRA_USB_PORTSC1_PTS(x) (((x) & 0x3) << 30)
#define TEGRA_USB_PORTSC1_PHCD (1 << 23)
/* HOSTPC1 PTS/PHCD bits, Tegra30 and above */
#define TEGRA_USB_HOSTPC1_DEVLC 0x1b4
#define TEGRA_USB_HOSTPC1_DEVLC_PTS(x) (((x) & 0x7) << 29)
#define TEGRA_USB_HOSTPC1_DEVLC_PHCD (1 << 22)
/* Bits of PORTSC1, which will get cleared by writing 1 into them */
#define TEGRA_PORTSC1_RWC_BITS (PORT_CSC | PORT_PEC | PORT_OCC)
@ -141,6 +147,12 @@
#define UTMIP_BIAS_CFG1 0x83c
#define UTMIP_BIAS_PDTRK_COUNT(x) (((x) & 0x1f) << 3)
/* For Tegra30 and above only, the address is different in Tegra20 */
#define USB_USBMODE 0x1f8
#define USB_USBMODE_MASK (3 << 0)
#define USB_USBMODE_HOST (3 << 0)
#define USB_USBMODE_DEVICE (2 << 0)
static DEFINE_SPINLOCK(utmip_pad_lock);
static int utmip_pad_count;
@ -193,10 +205,17 @@ static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
void __iomem *base = phy->regs;
unsigned long val;
val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
val &= ~TEGRA_USB_PORTSC1_PTS(3);
val |= TEGRA_USB_PORTSC1_PTS(pts_val & 3);
writel(val, base + TEGRA_USB_PORTSC1);
if (phy->soc_config->has_hostpc) {
val = readl(base + TEGRA_USB_HOSTPC1_DEVLC);
val &= ~TEGRA_USB_HOSTPC1_DEVLC_PTS(~0);
val |= TEGRA_USB_HOSTPC1_DEVLC_PTS(pts_val);
writel(val, base + TEGRA_USB_HOSTPC1_DEVLC);
} else {
val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
val &= ~TEGRA_USB_PORTSC1_PTS(~0);
val |= TEGRA_USB_PORTSC1_PTS(pts_val);
writel(val, base + TEGRA_USB_PORTSC1);
}
}
static void set_phcd(struct tegra_usb_phy *phy, bool enable)
@ -204,12 +223,21 @@ static void set_phcd(struct tegra_usb_phy *phy, bool enable)
void __iomem *base = phy->regs;
unsigned long val;
val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
if (enable)
val |= TEGRA_USB_PORTSC1_PHCD;
else
val &= ~TEGRA_USB_PORTSC1_PHCD;
writel(val, base + TEGRA_USB_PORTSC1);
if (phy->soc_config->has_hostpc) {
val = readl(base + TEGRA_USB_HOSTPC1_DEVLC);
if (enable)
val |= TEGRA_USB_HOSTPC1_DEVLC_PHCD;
else
val &= ~TEGRA_USB_HOSTPC1_DEVLC_PHCD;
writel(val, base + TEGRA_USB_HOSTPC1_DEVLC);
} else {
val = readl(base + TEGRA_USB_PORTSC1) & ~PORT_RWC_BITS;
if (enable)
val |= TEGRA_USB_PORTSC1_PHCD;
else
val &= ~TEGRA_USB_PORTSC1_PHCD;
writel(val, base + TEGRA_USB_PORTSC1);
}
}
static int utmip_pad_open(struct tegra_usb_phy *phy)
@ -367,17 +395,21 @@ static int utmi_phy_power_on(struct tegra_usb_phy *phy)
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);
if (!phy->soc_config->utmi_pll_config_in_car_module) {
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);
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 == USB_DR_MODE_PERIPHERAL) {
val = readl(base + USB_SUSP_CTRL);
@ -448,6 +480,16 @@ static int utmi_phy_power_on(struct tegra_usb_phy *phy)
utmi_phy_clk_enable(phy);
if (phy->soc_config->requires_usbmode_setup) {
val = readl(base + USB_USBMODE);
val &= ~USB_USBMODE_MASK;
if (phy->mode == USB_DR_MODE_HOST)
val |= USB_USBMODE_HOST;
else
val |= USB_USBMODE_DEVICE;
writel(val, base + USB_USBMODE);
}
if (!phy->is_legacy_phy)
set_pts(phy, 0);
@ -864,8 +906,30 @@ static int utmi_phy_probe(struct tegra_usb_phy *tegra_phy,
return 0;
}
static const struct tegra_phy_soc_config tegra20_soc_config = {
.utmi_pll_config_in_car_module = false,
.has_hostpc = false,
.requires_usbmode_setup = false,
.requires_extra_tuning_parameters = false,
};
static const struct tegra_phy_soc_config tegra30_soc_config = {
.utmi_pll_config_in_car_module = true,
.has_hostpc = true,
.requires_usbmode_setup = true,
.requires_extra_tuning_parameters = true,
};
static struct of_device_id tegra_usb_phy_id_table[] = {
{ .compatible = "nvidia,tegra30-usb-phy", .data = &tegra30_soc_config },
{ .compatible = "nvidia,tegra20-usb-phy", .data = &tegra20_soc_config },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_usb_phy_id_table);
static int tegra_usb_phy_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
struct resource *res;
struct tegra_usb_phy *tegra_phy = NULL;
struct device_node *np = pdev->dev.of_node;
@ -878,6 +942,13 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
return -ENOMEM;
}
match = of_match_device(tegra_usb_phy_id_table, &pdev->dev);
if (!match) {
dev_err(&pdev->dev, "Error: No device match found\n");
return -ENODEV;
}
tegra_phy->soc_config = match->data;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "Failed to get I/O memory\n");
@ -968,12 +1039,6 @@ static int tegra_usb_phy_remove(struct platform_device *pdev)
return 0;
}
static struct of_device_id tegra_usb_phy_id_table[] = {
{ .compatible = "nvidia,tegra20-usb-phy", },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_usb_phy_id_table);
static struct platform_driver tegra_usb_phy_driver = {
.probe = tegra_usb_phy_probe,
.remove = tegra_usb_phy_remove,

19
include/linux/usb/tegra_usb_phy.h
View File

@ -18,6 +18,24 @@
#include <linux/clk.h>
#include <linux/usb/otg.h>
/*
* utmi_pll_config_in_car_module: true if the UTMI PLL configuration registers
* should be set up by clk-tegra, false if by the PHY code
* has_hostpc: true if the USB controller has the HOSTPC extension, which
* changes the location of the PHCD and PTS fields
* requires_usbmode_setup: true if the USBMODE register needs to be set to
* enter host mode
* requires_extra_tuning_parameters: true if xcvr_hsslew, hssquelch_level
* and hsdiscon_level should be set for adequate signal quality
*/
struct tegra_phy_soc_config {
bool utmi_pll_config_in_car_module;
bool has_hostpc;
bool requires_usbmode_setup;
bool requires_extra_tuning_parameters;
};
struct tegra_utmip_config {
u8 hssync_start_delay;
u8 elastic_limit;
@ -47,6 +65,7 @@ struct tegra_usb_phy {
struct regulator *vbus;
enum usb_dr_mode mode;
void *config;
const struct tegra_phy_soc_config *soc_config;
struct usb_phy *ulpi;
struct usb_phy u_phy;
bool is_legacy_phy;