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Merge patch series "arm: mach-k3: remove some firewalls left over by ROM"

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Bryan Brattlof <bb@ti.com> says:

This small series is here to remove some firewalls setup by ROM during
their boot and clean things up for Linux later on. Ideally this would be
a simple call to remove_fwl_configs() however the location of the
firewall is problematic (could potentially crash the core) when we're
currently executing from the memory region protected by the firewall.

So we need to introduce a function which allows us to disable specific
firewall regions and skip others to ensure boot stability.

Link: https://lore.kernel.org/r/20250414-firewalls-v1-0-89090085c08b@ti.com
This commit is contained in:
Tom Rini
2025-04-24 10:45:41 -06:00
parent b0a300ad14 33b191997f
commit 629f089387
3 changed files with 38 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
arch/arm/mach-k3/am62x/am625_init.c
View File

@@ -29,6 +29,12 @@
/* TISCI DEV ID for A53 Clock */
#define AM62X_DEV_A53SS0_CORE_0_DEV_ID 135
struct fwl_data rom_fwls[] = {
{ "SOC_DEVGRP_MAIN", 641, 1 },
{ "SOC_DEVGRP_MAIN", 642, 1 },
{ "SOC_DEVGRP_MAIN", 642, 2 },
};
/*
* This uninitialized global variable would normal end up in the .bss section,
* but the .bss is cleared between writing and reading this variable, so move
@@ -177,6 +183,7 @@ void board_init_f(ulong dummy)
{
struct udevice *dev;
int ret;
int i;
if (IS_ENABLED(CONFIG_CPU_V7R)) {
setup_k3_mpu_regions();
@@ -261,6 +268,11 @@ void board_init_f(ulong dummy)
/* Output System Firmware version info */
k3_sysfw_print_ver();
/* Disable firewalls ROM has configured. */
if (IS_ENABLED(CONFIG_CPU_V7R))
for (i = 0; i < ARRAY_SIZE(rom_fwls); i++)
remove_fwl_region(&rom_fwls[i]);
if (IS_ENABLED(CONFIG_ESM_K3)) {
/* Probe/configure ESM0 */
ret = uclass_get_device_by_name(UCLASS_MISC, "esm@420000", &dev);

1
arch/arm/mach-k3/common.h
View File

@@ -35,6 +35,7 @@ enum k3_device_type {
void setup_k3_mpu_regions(void);
int early_console_init(void);
void disable_linefill_optimization(void);
int remove_fwl_region(struct fwl_data *fwl);
void remove_fwl_configs(struct fwl_data *fwl_data, size_t fwl_data_size);
int load_firmware(char *name_fw, char *name_loadaddr, u32 *loadaddr);
void k3_sysfw_print_ver(void);

25
arch/arm/mach-k3/r5/common.c
View File

@@ -253,6 +253,31 @@ void disable_linefill_optimization(void)
asm("mcr p15, 0, %0, c1, c0, 1" : : "r" (actlr));
}
int remove_fwl_region(struct fwl_data *fwl)
{
struct ti_sci_handle *sci = get_ti_sci_handle();
struct ti_sci_fwl_ops *ops = &sci->ops.fwl_ops;
struct ti_sci_msg_fwl_region region;
int ret;
region.fwl_id = fwl->fwl_id;
region.region = fwl->regions;
region.n_permission_regs = 3;
ops->get_fwl_region(sci, &region);
/* zero out the enable field of the firewall */
region.control = region.control & ~0xF;
pr_debug("Disabling firewall id: %d region: %d\n",
region.fwl_id, region.region);
ret = ops->set_fwl_region(sci, &region);
if (ret)
pr_err("Could not disable firewall\n");
return ret;
}
static void remove_fwl_regions(struct fwl_data fwl_data, size_t num_regions,
enum k3_firewall_region_type fwl_type)
{