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usb: phy: tegra: Read UTMIP parameters from device tree

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UTMIP parameters used to be hardcoded into tables in the
PHY driver. This patch reads them from the device tree instead
in accordance with the phy-tegra-usb DT documentation.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Mikko Perttunen 2013-07-17 09:31:01 +03:00 committed by Felipe Balbi
parent c49667e56f
commit 81d5dfe6d8
1 changed files with 87 additions and 42 deletions
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129
drivers/usb/phy/phy-tegra-usb.c
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@ -184,27 +184,6 @@ static const struct tegra_xtal_freq tegra_freq_table[] = {
},
};
static struct tegra_utmip_config utmip_default[] = {
[0] = {
.hssync_start_delay = 9,
.idle_wait_delay = 17,
.elastic_limit = 16,
.term_range_adj = 6,
.xcvr_setup = 9,
.xcvr_lsfslew = 1,
.xcvr_lsrslew = 1,
},
[2] = {
.hssync_start_delay = 9,
.idle_wait_delay = 17,
.elastic_limit = 16,
.term_range_adj = 6,
.xcvr_setup = 9,
.xcvr_lsfslew = 2,
.xcvr_lsrslew = 2,
},
};
static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
{
void __iomem *base = phy->regs;
@ -703,13 +682,6 @@ static int tegra_usb_phy_init(struct tegra_usb_phy *phy)
int i;
int err;
if (!phy->is_ulpi_phy) {
if (phy->is_legacy_phy)
phy->config = &utmip_default[0];
else
phy->config = &utmip_default[2];
}
phy->pll_u = devm_clk_get(phy->dev, "pll_u");
if (IS_ERR(phy->pll_u)) {
pr_err("Can't get pll_u clock\n");
@ -784,6 +756,88 @@ void tegra_ehci_phy_restore_end(struct usb_phy *x)
}
EXPORT_SYMBOL_GPL(tegra_ehci_phy_restore_end);
static int read_utmi_param(struct platform_device *pdev, const char *param,
u8 *dest)
{
u32 value;
int err = of_property_read_u32(pdev->dev.of_node, param, &value);
*dest = (u8)value;
if (err < 0)
dev_err(&pdev->dev, "Failed to read USB UTMI parameter %s: %d\n",
param, err);
return err;
}
static int utmi_phy_probe(struct tegra_usb_phy *tegra_phy,
struct platform_device *pdev)
{
struct resource *res;
int err;
struct tegra_utmip_config *config;
tegra_phy->is_ulpi_phy = false;
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res) {
dev_err(&pdev->dev, "Failed to get UTMI Pad regs\n");
return -ENXIO;
}
tegra_phy->pad_regs = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!tegra_phy->regs) {
dev_err(&pdev->dev, "Failed to remap UTMI Pad regs\n");
return -ENOMEM;
}
tegra_phy->config = devm_kzalloc(&pdev->dev,
sizeof(*tegra_phy->config), GFP_KERNEL);
if (!tegra_phy->config) {
dev_err(&pdev->dev,
"unable to allocate memory for USB UTMIP config\n");
return -ENOMEM;
}
config = tegra_phy->config;
err = read_utmi_param(pdev, "nvidia,hssync-start-delay",
&config->hssync_start_delay);
if (err < 0)
return err;
err = read_utmi_param(pdev, "nvidia,elastic-limit",
&config->elastic_limit);
if (err < 0)
return err;
err = read_utmi_param(pdev, "nvidia,idle-wait-delay",
&config->idle_wait_delay);
if (err < 0)
return err;
err = read_utmi_param(pdev, "nvidia,term-range-adj",
&config->term_range_adj);
if (err < 0)
return err;
err = read_utmi_param(pdev, "nvidia,xcvr-setup",
&config->xcvr_setup);
if (err < 0)
return err;
err = read_utmi_param(pdev, "nvidia,xcvr-lsfslew",
&config->xcvr_lsfslew);
if (err < 0)
return err;
err = read_utmi_param(pdev, "nvidia,xcvr-lsrslew",
&config->xcvr_lsrslew);
if (err < 0)
return err;
return 0;
}
static int tegra_usb_phy_probe(struct platform_device *pdev)
{
struct resource *res;
@ -815,20 +869,9 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
err = of_property_match_string(np, "phy_type", "ulpi");
if (err < 0) {
tegra_phy->is_ulpi_phy = false;
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res) {
dev_err(&pdev->dev, "Failed to get UTMI Pad regs\n");
return -ENXIO;
}
tegra_phy->pad_regs = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!tegra_phy->regs) {
dev_err(&pdev->dev, "Failed to remap UTMI Pad regs\n");
return -ENOMEM;
}
err = utmi_phy_probe(tegra_phy, pdev);
if (err < 0)
return err;
} else {
tegra_phy->is_ulpi_phy = true;
@ -839,6 +882,8 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
tegra_phy->reset_gpio);
return tegra_phy->reset_gpio;
}
tegra_phy->config = NULL;
}
err = of_property_match_string(np, "dr_mode", "otg");