[PATCH v2] mach-cpuimx27: workaround USB PHY detection problem
Eric Bénard
eric at eukrea.com
Thu Oct 14 06:07:19 EDT 2010
Signed-off-by: Eric Bénard <eric at eukrea.com>
---
v2 : should run checkpatch before sending v1 patch ;-)
arch/arm/mach-imx/mach-cpuimx27.c | 60 +++++++++++++++++++++++++++---------
1 files changed, 45 insertions(+), 15 deletions(-)
diff --git a/arch/arm/mach-imx/mach-cpuimx27.c b/arch/arm/mach-imx/mach-cpuimx27.c
index ea62afa..5d40c27 100644
--- a/arch/arm/mach-imx/mach-cpuimx27.c
+++ b/arch/arm/mach-imx/mach-cpuimx27.c
@@ -215,13 +215,58 @@ static struct platform_device serial_device = {
};
#endif
+static int otg_mode_host;
+
+static int __init eukrea_cpuimx27_otg_mode(char *options)
+{
+ if (!strcmp(options, "host"))
+ otg_mode_host = 1;
+ else if (!strcmp(options, "device"))
+ otg_mode_host = 0;
+ else
+ pr_info("otg_mode neither \"host\" nor \"device\". "
+ "Defaulting to device\n");
+ return 0;
+}
+__setup("otg_mode=", eukrea_cpuimx27_otg_mode);
+
#if defined(CONFIG_USB_ULPI)
static struct mxc_usbh_platform_data otg_pdata = {
.portsc = MXC_EHCI_MODE_ULPI,
.flags = MXC_EHCI_INTERFACE_DIFF_UNI,
};
+/*
+ * special init sequence which workarounds USBH2 USB PHY detection problems
+ * when both H2 and OTG port are configured as hosts
+ */
+static int usbh2_phy_init(struct platform_device *pdev)
+{
+ uint32_t temp;
+
+ if (otg_mode_host) {
+ /* configure USBCTRL */
+ temp = readl(MX27_IO_ADDRESS(MX27_OTG_BASE_ADDR) + 0x600);
+ temp &= ~((3 << 21) | 1);
+ temp |= (1 << 5) | (1 << 16) | (1 << 19)
+ | (1 << 11) | (1 << 20);
+ writel(temp, MX27_IO_ADDRESS(MX27_OTG_BASE_ADDR) + 0x600);
+
+ /* configure PORTSC1 */
+ temp = 2 << 30;
+ writel(temp, MX27_IO_ADDRESS(MX27_OTG_BASE_ADDR) + 0x584);
+
+ /* reset controller */
+ temp = readl(MX27_IO_ADDRESS(MX27_OTG_BASE_ADDR) + 0x540);
+ temp |= 0x02;
+ writel(temp, MX27_IO_ADDRESS(MX27_OTG_BASE_ADDR) + 0x540);
+ }
+
+ return 0;
+}
+
static struct mxc_usbh_platform_data usbh2_pdata = {
+ .init = usbh2_phy_init,
.portsc = MXC_EHCI_MODE_ULPI,
.flags = MXC_EHCI_INTERFACE_DIFF_UNI,
};
@@ -232,21 +277,6 @@ static struct fsl_usb2_platform_data otg_device_pdata = {
.phy_mode = FSL_USB2_PHY_ULPI,
};
-static int otg_mode_host;
-
-static int __init eukrea_cpuimx27_otg_mode(char *options)
-{
- if (!strcmp(options, "host"))
- otg_mode_host = 1;
- else if (!strcmp(options, "device"))
- otg_mode_host = 0;
- else
- pr_info("otg_mode neither \"host\" nor \"device\". "
- "Defaulting to device\n");
- return 0;
-}
-__setup("otg_mode=", eukrea_cpuimx27_otg_mode);
-
static void __init eukrea_cpuimx27_init(void)
{
mxc_gpio_setup_multiple_pins(eukrea_cpuimx27_pins,
--
1.7.0.4
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