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arm: mach-k3: am6_init: Do USB fixups to facilitate host and device boot modes

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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@ti.com>
This commit is contained in:
Faiz Abbas 2020-08-03 11:35:09 +05:30 • committed by Lokesh Vutla
parent febb47ac61
commit 403fc5c9cf
1 changed files with 40 additions and 0 deletions
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40
arch/arm/mach-k3/am6_init.c
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@ -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@100000/dwc3@4000000/usb@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)