[PATCH v2 06/13] arm: mach-k3: am6_init: Do USB fixups to facilitate host and device boot modes

[Faiz Abbas]

U-boot only supports either USB host or device mode for a node at a
time in dts. To support both host and dfu bootmodes, set "peripheral"
as the default dr_mode but fixup property to "host" if host bootmode
is detected.

This needs to happen before the dwc3 generic layer binds the usb device
to a host or device driver. Therefore, add an fdtdec_setup_board()
implementation to fixup the dt based on the boot mode.

Also use the same fixup function to set the USB-PCIe Serdes mux to PCIe
in both the host and device cases. This is required for accessing the
interface at USB 2.0 speeds.

Signed-off-by: Faiz Abbas <faiz_abbas at ti.com>
---
 arch/arm/mach-k3/am6_init.c | 40 +++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/arch/arm/mach-k3/am6_init.c b/arch/arm/mach-k3/am6_init.c
index 42d13a39f8..c6d4f05a01 100644
--- a/arch/arm/mach-k3/am6_init.c
+++ b/arch/arm/mach-k3/am6_init.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <fdt_support.h>
 #include <init.h>
 #include <asm/io.h>
 #include <spl.h>
@@ -22,6 +23,8 @@
 #include <mmc.h>
 #include <stdlib.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 #ifdef CONFIG_SPL_BUILD
 #ifdef CONFIG_K3_LOAD_SYSFW
 #ifdef CONFIG_TI_SECURE_DEVICE
@@ -119,7 +122,44 @@ void k3_mmc_restart_clock(void)
 void k3_mmc_stop_clock(void) {}
 void k3_mmc_restart_clock(void) {}
 #endif
+#if CONFIG_IS_ENABLED(DFU) || CONFIG_IS_ENABLED(USB_STORAGE)
+#define CTRLMMR_SERDES0_CTRL	0x00104080
+#define PCIE_LANE0		0x1
+static int fixup_usb_boot(void)
+{
+	int ret;
 
+	switch (spl_boot_device()) {
+	case BOOT_DEVICE_USB:
+		/*
+		 * If bootmode is Host bootmode, fixup the dr_mode to host
+		 * before the dwc3 bind takes place
+		 */
+		ret = fdt_find_and_setprop((void *)gd->fdt_blob,
+				"/interconnect at 100000/dwc3 at 4000000/usb at 10000",
+				"dr_mode", "host", 11, 0);
+		if (ret)
+			printf("%s: fdt_find_and_setprop() failed:%d\n", __func__,
+			       ret);
+		fallthrough;
+	case BOOT_DEVICE_DFU:
+		/*
+		 * The serdes mux between PCIe and USB3 needs to be set to PCIe for
+		 * accessing the interface at USB 2.0
+		 */
+		writel(PCIE_LANE0, CTRLMMR_SERDES0_CTRL);
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+int fdtdec_board_setup(const void *fdt_blob)
+{
+	return fixup_usb_boot();
+}
+#endif
 void board_init_f(ulong dummy)
 {
 #if defined(CONFIG_K3_LOAD_SYSFW) || defined(CONFIG_K3_AM654_DDRSS)
-- 
2.17.1