arm: K3: Disable ROM configured firewalls

ROM configures certain firewalls based on its usage, which includes
the one in front of boot peripherals. In specific case of boot
peripherals, ROM does not open up the full address space corresponding
to the peripherals. Like in OSPI, ROM only configures the firewall region
for 32 bit address space and mark 64bit address space flash regions
as in-accessible.

When security-cfg is initialized by sysfw, all the non-configured
firewalls are kept in bypass state using a global setting. Since ROM
configured firewalls for certain peripherals, these will not be touched.
So when bootloader touches any of the address space that ROM marked as
in-accessible, system raises a firewall exception causing boot hang.

It would have been ideal if sysfw cleans up the ROM configured boot
peripheral firewalls. Given the memory overhead to store this
information provided by ROM and the boot time increase in re configuring
the firewalls, it is concluded to clean this up in bootloaders.

So disable all the firewalls that ROM doesn't open up the full address
space.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Venkateswara Rao Mandela <venkat.mandela@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

4 files changed, 115 insertions, 0 deletions

diff --git a/arch/arm/mach-k3/am6_init.c b/arch/arm/mach-k3/am6_init.c
index c5da965..8d107b8 100644
--- a/arch/arm/mach-k3/am6_init.c
+++ b/arch/arm/mach-k3/am6_init.c
@@ -19,6 +19,26 @@
 #include <linux/soc/ti/ti_sci_protocol.h>
 
 #ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_K3_LOAD_SYSFW
+#ifdef CONFIG_TI_SECURE_DEVICE
+struct fwl_data main_cbass_fwls[] = {
+	{ "MMCSD1_CFG", 2057, 1 },
+	{ "MMCSD0_CFG", 2058, 1 },
+	{ "USB3SS0_SLV0", 2176, 2 },
+	{ "PCIE0_SLV", 2336, 8 },
+	{ "PCIE1_SLV", 2337, 8 },
+	{ "PCIE0_CFG", 2688, 1 },
+	{ "PCIE1_CFG", 2689, 1 },
+}, mcu_cbass_fwls[] = {
+	{ "MCU_ARMSS0_CORE0_SLV", 1024, 1 },
+	{ "MCU_ARMSS0_CORE1_SLV", 1028, 1 },
+	{ "MCU_FSS0_S1", 1033, 8 },
+	{ "MCU_FSS0_S0", 1036, 8 },
+	{ "MCU_CPSW0", 1220, 1 },
+};
+#endif
+#endif
+
 static void mmr_unlock(u32 base, u32 partition)
 {
 	/* Translate the base address */
@@ -109,6 +129,12 @@ void board_init_f(ulong dummy)
 	 * output.
 	 */
 	k3_sysfw_loader(preloader_console_init);
+
+	/* Disable ROM configured firewalls right after loading sysfw */
+#ifdef CONFIG_TI_SECURE_DEVICE
+	remove_fwl_configs(main_cbass_fwls, ARRAY_SIZE(main_cbass_fwls));
+	remove_fwl_configs(mcu_cbass_fwls, ARRAY_SIZE(mcu_cbass_fwls));
+#endif
 #else
 	/* Prepare console output */
 	preloader_console_init();
diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
index e8b7d70..8d15290 100644
--- a/arch/arm/mach-k3/common.c
+++ b/arch/arm/mach-k3/common.c
@@ -269,3 +269,33 @@ void disable_linefill_optimization(void)
 	asm("mcr p15, 0, %0, c1, c0, 1" : : "r" (actlr));
 }
 #endif
+
+void remove_fwl_configs(struct fwl_data *fwl_data, size_t fwl_data_size)
+{
+	struct ti_sci_msg_fwl_region region;
+	struct ti_sci_fwl_ops *fwl_ops;
+	struct ti_sci_handle *ti_sci;
+	size_t i, j;
+
+	ti_sci = get_ti_sci_handle();
+	fwl_ops = &ti_sci->ops.fwl_ops;
+	for (i = 0; i < fwl_data_size; i++) {
+		for (j = 0; j <  fwl_data[i].regions; j++) {
+			region.fwl_id = fwl_data[i].fwl_id;
+			region.region = j;
+			region.n_permission_regs = 3;
+
+			fwl_ops->get_fwl_region(ti_sci, &region);
+
+			if (region.control != 0) {
+				pr_debug("Attempting to disable firewall %5d (%25s)\n",
+					 region.fwl_id, fwl_data[i].name);
+				region.control = 0;
+
+				if (fwl_ops->set_fwl_region(ti_sci, &region))
+					pr_err("Could not disable firewall %5d (%25s)\n",
+					       region.fwl_id, fwl_data[i].name);
+			}
+		}
+	}
+}
diff --git a/arch/arm/mach-k3/common.h b/arch/arm/mach-k3/common.h
index 35d1609..d8b34fe 100644
--- a/arch/arm/mach-k3/common.h
+++ b/arch/arm/mach-k3/common.h
@@ -14,6 +14,13 @@
 #define REV_PG1_0	0
 #define REV_PG2_0	1
 
+struct fwl_data {
+	const char *name;
+	u16 fwl_id;
+	u16 regions;
+};
+
 void setup_k3_mpu_regions(void);
 int early_console_init(void);
 void disable_linefill_optimization(void);
+void remove_fwl_configs(struct fwl_data *fwl_data, size_t fwl_data_size);
diff --git a/arch/arm/mach-k3/j721e_init.c b/arch/arm/mach-k3/j721e_init.c
index 8d562e4..f7f7398 100644
--- a/arch/arm/mach-k3/j721e_init.c
+++ b/arch/arm/mach-k3/j721e_init.c
@@ -20,6 +20,47 @@
 #include <dm/pinctrl.h>
 
 #ifdef CONFIG_SPL_BUILD
+#ifdef CONFIG_K3_LOAD_SYSFW
+#ifdef CONFIG_TI_SECURE_DEVICE
+struct fwl_data cbass_hc_cfg0_fwls[] = {
+	{ "PCIE0_CFG", 2560, 8 },
+	{ "PCIE1_CFG", 2561, 8 },
+	{ "USB3SS0_CORE", 2568, 4 },
+	{ "USB3SS1_CORE", 2570, 4 },
+	{ "EMMC8SS0_CFG", 2576, 4 },
+	{ "UFS_HCI0_CFG", 2580, 4 },
+	{ "SERDES0", 2584, 1 },
+	{ "SERDES1", 2585, 1 },
+}, cbass_hc0_fwls[] = {
+	{ "PCIE0_HP", 2528, 24 },
+	{ "PCIE0_LP", 2529, 24 },
+	{ "PCIE1_HP", 2530, 24 },
+	{ "PCIE1_LP", 2531, 24 },
+}, cbass_rc_cfg0_fwls[] = {
+	{ "EMMCSD4SS0_CFG", 2380, 4 },
+}, cbass_rc0_fwls[] = {
+	{ "GPMC0", 2310, 8 },
+}, infra_cbass0_fwls[] = {
+	{ "PLL_MMR0", 8, 26 },
+	{ "CTRL_MMR0", 9, 16 },
+}, mcu_cbass0_fwls[] = {
+	{ "MCU_R5FSS0_CORE0", 1024, 4 },
+	{ "MCU_R5FSS0_CORE0_CFG", 1025, 2 },
+	{ "MCU_R5FSS0_CORE1", 1028, 4 },
+	{ "MCU_FSS0_CFG", 1032, 12 },
+	{ "MCU_FSS0_S1", 1033, 8 },
+	{ "MCU_FSS0_S0", 1036, 8 },
+	{ "MCU_PSROM49152X32", 1048, 1 },
+	{ "MCU_MSRAM128KX64", 1050, 8 },
+	{ "MCU_CTRL_MMR0", 1200, 8 },
+	{ "MCU_PLL_MMR0", 1201, 3 },
+	{ "MCU_CPSW0", 1220, 2 },
+}, wkup_cbass0_fwls[] = {
+	{ "WKUP_CTRL_MMR0", 131, 16 },
+};
+#endif
+#endif
+
 static void mmr_unlock(u32 base, u32 partition)
 {
 	/* Translate the base address */
@@ -114,6 +155,17 @@ void board_init_f(ulong dummy)
 	 * output.
 	 */
 	k3_sysfw_loader(preloader_console_init);
+
+	/* Disable ROM configured firewalls right after loading sysfw */
+#ifdef CONFIG_TI_SECURE_DEVICE
+	remove_fwl_configs(cbass_hc_cfg0_fwls, ARRAY_SIZE(cbass_hc_cfg0_fwls));
+	remove_fwl_configs(cbass_hc0_fwls, ARRAY_SIZE(cbass_hc0_fwls));
+	remove_fwl_configs(cbass_rc_cfg0_fwls, ARRAY_SIZE(cbass_rc_cfg0_fwls));
+	remove_fwl_configs(cbass_rc0_fwls, ARRAY_SIZE(cbass_rc0_fwls));
+	remove_fwl_configs(infra_cbass0_fwls, ARRAY_SIZE(infra_cbass0_fwls));
+	remove_fwl_configs(mcu_cbass0_fwls, ARRAY_SIZE(mcu_cbass0_fwls));
+	remove_fwl_configs(wkup_cbass0_fwls, ARRAY_SIZE(wkup_cbass0_fwls));
+#endif
 #else
 	/* Prepare console output */
 	preloader_console_init();