soc/mediatek/mt8188: Enable lastbus debug hardware

Lastbus is a bus debug tool. When the bus hangs, the bus transmission
information before resetting will be recorded.

The watchdog cannot clear it and it will be printed out for bus hanging
analysis.

There are two versions for lastbus:
Version 1 for MT8186, and version 2 for MT8188.

BUG=b:263753374
TEST=build pass.
Change-Id: Ibaf510481d1941376bd8da0168ef17c99a0fb9a2
Signed-off-by: ot_zhenguo.li <ot_zhenguo.li@mediatek.corp-partner.google.com>
Signed-off-by: jason-ch chen <Jason-ch.Chen@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73624
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/soc/mediatek/common/include/soc/lastbus_v1.h

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#ifndef SOC_MEDIATEK_COMMON_LASTBUS_H
+#ifndef SOC_MEDIATEK_COMMON_LASTBUS_V1_H
-#define SOC_MEDIATEK_COMMON_LASTBUS_H
+#define SOC_MEDIATEK_COMMON_LASTBUS_V1_H
 
 /* INFRA LASTBUS INFO */
 #define BUS_INFRA_SNAPSHOT	0xd00

src/soc/mediatek/common/include/soc/lastbus_v2.h

@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SOC_MEDIATEK_COMMON_LASTBUS_V2_H
+#define SOC_MEDIATEK_COMMON_LASTBUS_V2_H
+
+#define NR_MAX_LASTBUS_IDLE_MASK	8
+#define NR_MAX_LASTBUS_MONITOR		16
+#define TIMEOUT_THRES_SHIFT		16
+#define TIMEOUT_TYPE_SHIFT		1
+#define LASTBUS_TIMEOUT_CLR		0x0200
+#define LASTBUS_DEBUG_CKEN		0x0008
+#define LASTBUS_DEBUG_EN		0x0004
+#define LASTBUS_TIMEOUT			0x0001
+
+struct lastbus_idle_mask {
+	u32 reg_offset;
+	u32 reg_value;
+};
+
+struct lastbus_monitor {
+	const char *name;
+	uintptr_t base;
+	size_t num_ports;
+	u16 bus_freq_mhz;
+	size_t num_idle_mask;
+	struct lastbus_idle_mask idle_masks[NR_MAX_LASTBUS_IDLE_MASK];
+};
+
+struct lastbus_config {
+	const char *latch_platform;
+	unsigned int timeout_ms;
+	unsigned int timeout_type;
+	unsigned int num_used_monitors;
+	struct lastbus_monitor monitors[NR_MAX_LASTBUS_MONITOR];
+};
+
+void lastbus_init(void);
+extern const struct lastbus_config lastbus_cfg;
+
+#endif

src/soc/mediatek/common/lastbus_v1.c

@@ -3,7 +3,7 @@
 #include <console/console.h>
 #include <device/mmio.h>
 #include <soc/addressmap.h>
-#include <soc/lastbus.h>
+#include <soc/lastbus_v1.h>
 
 static unsigned long preisys_dump_offset[] = {
 	0x500, /* PERIBUS_DBG0 */

src/soc/mediatek/common/lastbus_v2.c

@@ -0,0 +1,112 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/mmio.h>
+#include <soc/addressmap.h>
+#include <soc/lastbus_v2.h>
+#include <timer.h>
+
+#define SYS_TIMER_0_OFFSET 0x400
+#define SYS_TIMER_1_OFFSET 0x404
+#define DEBUG_RESULT_OFFSET 0x408
+
+static bool lastbus_is_timeout(const struct lastbus_monitor *m)
+{
+	return read32p(m->base) & LASTBUS_TIMEOUT;
+}
+
+static uint64_t gray_code_to_binary(uint64_t gray_code)
+{
+	uint64_t value = 0;
+	while (gray_code) {
+		value ^= gray_code;
+		gray_code >>= 1;
+	}
+	return value;
+}
+
+static void lastbus_dump_monitor(const struct lastbus_monitor *m)
+{
+	int i;
+	uint64_t gray_code, bin_code;
+
+	printk(BIOS_INFO, "--- %s %#lx %ld ---\n", m->name, m->base, m->num_ports);
+
+	for (i = 0; i < m->num_ports; i++)
+		printk(BIOS_INFO, "%08x\n",
+		       read32p(m->base + DEBUG_RESULT_OFFSET + (i * 4)));
+
+	gray_code = (uint64_t)read32p(m->base + SYS_TIMER_1_OFFSET) << 32 |
+		    read32p(m->base + SYS_TIMER_0_OFFSET);
+	bin_code = gray_code_to_binary(gray_code);
+	printk(BIOS_INFO, "\ntimestamp: %#llx\n", bin_code);
+}
+
+static void lastbus_dump(void)
+{
+	const struct lastbus_monitor *m;
+	bool found  = false;
+	int i;
+
+	for (i = 0; i < lastbus_cfg.num_used_monitors; i++) {
+		m = &lastbus_cfg.monitors[i];
+		if (!lastbus_is_timeout(m))
+			continue;
+
+		if (!found)
+			printk(BIOS_INFO,
+			       "\n******************* %s lastbus ******************\n",
+			       lastbus_cfg.latch_platform);
+		found = true;
+		lastbus_dump_monitor(m);
+	}
+}
+
+static u16 calculate_timeout_thres(u16 bus_freq_mhz, u32 timeout_ms)
+{
+	u64 value;
+	value = ((u64)timeout_ms * USECS_PER_MSEC * bus_freq_mhz) >> 10;
+	if (value >= UINT16_MAX)
+		return UINT16_MAX - 1;
+	return value >= 1 ? value - 1 : 0;
+}
+
+static void lastbus_init_monitor(const struct lastbus_monitor *m,
+				 u32 timeout_ms, u32 timeout_type)
+{
+	u16 timeout_thres;
+	int i;
+
+	for (i = 0; i < m->num_idle_mask; i++)
+		write32p(m->base + m->idle_masks[i].reg_offset,
+			 m->idle_masks[i].reg_value);
+
+	/* clear timeout status with DBG_CKEN */
+	write32p(m->base, LASTBUS_TIMEOUT_CLR | LASTBUS_DEBUG_CKEN);
+	/* de-assert clear bit */
+	clrbits32p(m->base, LASTBUS_TIMEOUT_CLR);
+
+	if (timeout_ms == UINT32_MAX)
+		timeout_thres = 0xFFFF;
+	else
+		timeout_thres = calculate_timeout_thres(m->bus_freq_mhz, timeout_ms);
+
+	setbits32p(m->base, (timeout_thres << TIMEOUT_THRES_SHIFT) |
+			    (timeout_type << TIMEOUT_TYPE_SHIFT));
+	setbits32p(m->base, LASTBUS_DEBUG_EN);
+}
+
+static void lastbus_setup(void)
+{
+	int i;
+
+	for (i = 0; i < lastbus_cfg.num_used_monitors; i++)
+		lastbus_init_monitor(&lastbus_cfg.monitors[i], lastbus_cfg.timeout_ms,
+				     lastbus_cfg.timeout_type);
+}
+
+void lastbus_init(void)
+{
+	lastbus_dump();
+	lastbus_setup();
+}

src/soc/mediatek/mt8186/Makefile.inc

@@ -14,7 +14,7 @@ all-y += ../common/uart.c
 bootblock-y += bootblock.c
 bootblock-y += ../common/eint_event.c
 bootblock-y += gic.c
-bootblock-y += ../common/lastbus.c
+bootblock-y += ../common/lastbus_v1.c
 bootblock-y += ../common/mmu_operations.c
 bootblock-y += ../common/tracker.c ../common/tracker_v1.c
 bootblock-y += ../common/wdt.c ../common/wdt_req.c wdt.c

src/soc/mediatek/mt8186/bootblock.c

@@ -3,7 +3,7 @@
 #include <bootblock_common.h>
 #include <soc/eint_event.h>
 #include <soc/gic.h>
-#include <soc/lastbus.h>
+#include <soc/lastbus_v1.h>
 #include <soc/mmu_operations.h>
 #include <soc/pll.h>
 #include <soc/tracker_common.h>

src/soc/mediatek/mt8188/Makefile.inc

@@ -11,6 +11,7 @@ all-y += ../common/uart.c
 
 bootblock-y += bootblock.c
 bootblock-y += ../common/eint_event.c
+bootblock-y += ../common/lastbus_v2.c lastbus.c
 bootblock-y += ../common/mmu_operations.c
 bootblock-y += ../common/tracker.c ../common/tracker_v2.c
 bootblock-y += ../common/wdt.c ../common/wdt_req.c wdt.c

src/soc/mediatek/mt8188/bootblock.c

@@ -4,6 +4,7 @@
 #include <soc/eint_event.h>
 #include <soc/mmu_operations.h>
 #include <soc/pll.h>
+#include <soc/lastbus_v2.h>
 #include <soc/tracker_common.h>
 #include <soc/wdt.h>
 
@@ -11,6 +12,7 @@ void bootblock_soc_init(void)
 {
 	mtk_mmu_init();
 	bustracker_init();
+	lastbus_init();
 	mtk_wdt_init();
 	mt_pll_init();
 	unmask_eint_event_mask();

src/soc/mediatek/mt8188/include/soc/addressmap.h

@@ -27,14 +27,20 @@ enum {
 	APMIXED_BASE		= IO_PHYS + 0x0000C000,
 	SYSTIMER_BASE		= IO_PHYS + 0x00017000,
 	INFRACFG_AO_BCRM_BASE	= IO_PHYS + 0x00022000,
+	INFRA_AO_DBUG_BASE      = IO_PHYS + 0x00023000,
 	PMIF_SPI_BASE		= IO_PHYS + 0x00024000,
 	PMICSPI_MST_BASE	= IO_PHYS + 0x00025000,
 	PMIF_SPMI_BASE		= IO_PHYS + 0x00027000,
+	INFRA2_AO_DBUG_BASE     = IO_PHYS + 0x00028000,
 	SPMI_MST_BASE		= IO_PHYS + 0x00029000,
+	PERI_AO_BASE            = IO_PHYS + 0x0002B000,
+	PERI_AO2_BASE           = IO_PHYS + 0x0002E000,
 	DEVAPC_INFRA_AO_BASE	= IO_PHYS + 0x00030000,
 	DEVAPC_PERI_AO_BASE	= IO_PHYS + 0x00034000,
 	DEVAPC_PERI2_AO_BASE	= IO_PHYS + 0x00038000,
 	DEVAPC_PERI_PAR_AO_BASE	= IO_PHYS + 0x0003C000,
+	PERI_PAR_AO_BASE        = IO_PHYS + 0x00040000,
+	FMEM_AO_BASE            = IO_PHYS + 0x00042000,
 	DBG_TRACKER_BASE	= IO_PHYS + 0x00208000,
 	PERI_TRACKER_BASE	= IO_PHYS + 0x00218000,
 	EMI0_BASE		= IO_PHYS + 0x00219000,

src/soc/mediatek/mt8188/lastbus.c

@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/mmio.h>
+#include <soc/addressmap.h>
+#include <soc/lastbus_v2.h>
+
+const struct lastbus_config lastbus_cfg = {
+	.latch_platform = "MT8188",
+	.timeout_ms = 200,
+	.timeout_type = 0,
+	.num_used_monitors = 6,
+	.monitors = {
+		{
+			.name = "debug_ctrl_ao_INFRA_AO",
+			.base = INFRA_AO_DBUG_BASE,
+			.num_ports = 34,
+			.num_idle_mask = 2,
+			.idle_masks = {
+				{
+					.reg_offset = 0x04,
+					.reg_value = 0x2,
+				},
+				{
+					.reg_offset = 0x08,
+					.reg_value = 0x10000,
+				},
+			},
+			.bus_freq_mhz = 78,
+		},
+		{
+			.name = "debug_ctrl_ao_INFRA2_AO",
+			.base = INFRA2_AO_DBUG_BASE,
+			.num_ports = 9,
+			.num_idle_mask = 0,
+			.bus_freq_mhz = 78,
+		},
+		{
+			.name = "debug_ctrl_ao_PERI_AO",
+			.base = PERI_AO_BASE,
+			.num_ports = 25,
+			.num_idle_mask = 1,
+			.idle_masks = {
+				{
+					.reg_offset = 0x04,
+					.reg_value = 0x20000,
+				},
+			},
+			.bus_freq_mhz = 78,
+		},
+		{
+			.name = "debug_ctrl_ao_PERI_AO2",
+			.base = PERI_AO2_BASE,
+			.num_ports = 20,
+			.num_idle_mask = 0,
+			.bus_freq_mhz = 78,
+		},
+		{
+			.name = "debug_ctrl_ao_PERI_PAR_AO",
+			.base = PERI_PAR_AO_BASE,
+			.num_ports = 18,
+			.num_idle_mask = 0,
+			.bus_freq_mhz = 78,
+		},
+		{
+			.name = "debug_ctrl_ao_FMEM_AO",
+			.base = FMEM_AO_BASE,
+			.num_ports = 28,
+			.num_idle_mask = 1,
+			.idle_masks = {
+				{
+					.reg_offset = 0x14,
+					.reg_value = 0x204,
+				},
+			},
+			.bus_freq_mhz = 78,
+		},
+	},
+};