lib: sbi: convert reset to list

To support different handlers for different types of resets, we are
adding a sbi_list of restart handlers.

Instead of sbi_system_reset_set_device we use
sbi_system_reset_add_device to reflect the actual meaning.

Signed-off-by: Nikita Shubin <n.shubin@yadro.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

include/sbi/sbi_system.h

@@ -11,6 +11,7 @@
 #define __SBI_SYSTEM_H__
 
 #include <sbi/sbi_types.h>
+#include <sbi/sbi_list.h>
 
 /** System reset hardware device */
 struct sbi_system_reset_device {
@@ -22,11 +23,21 @@ struct sbi_system_reset_device {
 
 	/** Reset the system */
 	void (*system_reset)(u32 reset_type, u32 reset_reason);
+
+	/** List */
+	struct sbi_dlist node;
 };
 
-const struct sbi_system_reset_device *sbi_system_reset_get_device(void);
+static inline struct sbi_system_reset_device *to_system_reset_device(
+						struct sbi_dlist *node)
+{
+	return container_of(node, struct sbi_system_reset_device, node);
+}
 
-void sbi_system_reset_set_device(const struct sbi_system_reset_device *dev);
+const struct sbi_system_reset_device *sbi_system_reset_get_device(
+					u32 reset_type, u32 reset_reason);
+
+void sbi_system_reset_add_device(struct sbi_system_reset_device *dev);
 
 bool sbi_system_reset_supported(u32 reset_type, u32 reset_reason);
 

lib/sbi/sbi_init.c

@@ -84,8 +84,11 @@ static void sbi_boot_print_general(struct sbi_scratch *scratch)
 	hdev = sbi_hsm_get_device();
 	sbi_printf("Platform HSM Device       : %s\n",
 		   (hdev) ? hdev->name : "---");
-	srdev = sbi_system_reset_get_device();
+	srdev = sbi_system_reset_get_device(SBI_SRST_RESET_TYPE_COLD_REBOOT, 0);
-	sbi_printf("Platform SysReset Device  : %s\n",
+	sbi_printf("Platform Reboot Device    : %s\n",
+		   (srdev) ? srdev->name : "---");
+	srdev = sbi_system_reset_get_device(SBI_SRST_RESET_TYPE_SHUTDOWN, 0);
+	sbi_printf("Platform Shutdown Device  : %s\n",
 		   (srdev) ? srdev->name : "---");
 
 	/* Firmware details */

lib/sbi/sbi_system.c

@@ -18,28 +18,36 @@
 #include <sbi/sbi_ipi.h>
 #include <sbi/sbi_init.h>
 
-static const struct sbi_system_reset_device *reset_dev = NULL;
+static SBI_LIST_HEAD(reset_devices_list);
 
-const struct sbi_system_reset_device *sbi_system_reset_get_device(void)
+const struct sbi_system_reset_device *sbi_system_reset_get_device(
+					u32 reset_type, u32 reset_reason)
 {
-	return reset_dev;
+	struct sbi_system_reset_device *dev = 0;
+	struct sbi_dlist *pos;
+
+	/* Check each reset device registered for supported reset type */
+	sbi_list_for_each(pos, &(reset_devices_list)) {
+		dev = to_system_reset_device(pos);
+		if (dev->system_reset_check &&
+			dev->system_reset_check(reset_type, reset_reason))
+			break;
+	}
+
+	return dev;
 }
 
-void sbi_system_reset_set_device(const struct sbi_system_reset_device *dev)
+void sbi_system_reset_add_device(struct sbi_system_reset_device *dev)
 {
-	if (!dev || reset_dev)
+	if (!dev || !dev->system_reset_check)
 		return;
 
-	reset_dev = dev;
+	sbi_list_add(&(dev->node), &(reset_devices_list));
 }
 
 bool sbi_system_reset_supported(u32 reset_type, u32 reset_reason)
 {
-	if (reset_dev && reset_dev->system_reset_check &&
+	return !!sbi_system_reset_get_device(reset_type, reset_reason);
-	    reset_dev->system_reset_check(reset_type, reset_reason))
-		return TRUE;
-
-	return FALSE;
 }
 
 void __noreturn sbi_system_reset(u32 reset_type, u32 reset_reason)
@@ -62,9 +70,12 @@ void __noreturn sbi_system_reset(u32 reset_type, u32 reset_reason)
 	sbi_hsm_hart_stop(scratch, FALSE);
 
 	/* Platform specific reset if domain allowed system reset */
-	if (dom->system_reset_allowed &&
+	if (dom->system_reset_allowed) {
-	    reset_dev && reset_dev->system_reset)
+		const struct sbi_system_reset_device *dev =
-		reset_dev->system_reset(reset_type, reset_reason);
+			sbi_system_reset_get_device(reset_type, reset_reason);
+		if (dev)
+			dev->system_reset(reset_type, reset_reason);
+	}
 
 	/* If platform specific reset did not work then do sbi_exit() */
 	sbi_exit(scratch);

lib/utils/reset/fdt_reset_gpio.c

@@ -115,7 +115,7 @@ static int gpio_reset_init(void *fdt, int nodeoff,
 	if (len > 0)
 		reset->inactive_delay = fdt32_to_cpu(*val);
 
-	sbi_system_reset_set_device(&gpio_reset);
+	sbi_system_reset_add_device(&gpio_reset);
 
 	return 0;
 }

lib/utils/reset/fdt_reset_sunxi_wdt.c

@@ -61,7 +61,7 @@ static int sunxi_wdt_reset_init(void *fdt, int nodeoff,
 
 	sunxi_wdt_base = (volatile void *)(unsigned long)reg_addr;
 
-	sbi_system_reset_set_device(&sunxi_wdt_reset);
+	sbi_system_reset_add_device(&sunxi_wdt_reset);
 
 	return 0;
 }

lib/utils/reset/fdt_reset_thead.c

@@ -126,7 +126,7 @@ static int thead_reset_init(void *fdt, int nodeoff,
 		}
 	}
 
-	sbi_system_reset_set_device(&thead_reset);
+	sbi_system_reset_add_device(&thead_reset);
 
 	return 0;
 }

lib/utils/sys/htif.c

@@ -176,7 +176,7 @@ static struct sbi_system_reset_device htif_reset = {
 
 int htif_system_reset_init(void)
 {
-	sbi_system_reset_set_device(&htif_reset);
+	sbi_system_reset_add_device(&htif_reset);
 
 	return 0;
 }

lib/utils/sys/sifive_test.c

@@ -59,7 +59,7 @@ static struct sbi_system_reset_device sifive_test_reset = {
 int sifive_test_init(unsigned long base)
 {
 	sifive_test_base = (void *)base;
-	sbi_system_reset_set_device(&sifive_test_reset);
+	sbi_system_reset_add_device(&sifive_test_reset);
 
 	return 0;
 }

platform/kendryte/k210/platform.c

@@ -108,7 +108,7 @@ static struct sbi_system_reset_device k210_reset = {
 static int k210_early_init(bool cold_boot)
 {
 	if (cold_boot)
-		sbi_system_reset_set_device(&k210_reset);
+		sbi_system_reset_add_device(&k210_reset);
 
 	return 0;
 }

platform/nuclei/ux600/platform.c

@@ -148,7 +148,7 @@ static int ux600_early_init(bool cold_boot)
 	u32 regval;
 
 	if (cold_boot)
-		sbi_system_reset_set_device(&ux600_reset);
+		sbi_system_reset_add_device(&ux600_reset);
 
 	/* Measure CPU Frequency using Timer */
 	ux600_clk_freq = ux600_get_clk_freq();