xtensa: drop platform_restart

Instead of using xtensa-specific platform_restart callback use
do_kernel_restart in the machine_restart implementation and reimplement
existing platform_restart users with register_restart_handler.
Drop platform_restart declaration and default implementation.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

3 files changed, 37 insertions, 6 deletions

diff --git a/arch/xtensa/platforms/iss/setup.c b/arch/xtensa/platforms/iss/setup.c
index d3433e1bb94e..a7009f223ef2 100644
--- a/arch/xtensa/platforms/iss/setup.c
+++ b/arch/xtensa/platforms/iss/setup.c
@@ -16,6 +16,7 @@
 #include <linux/notifier.h>
 #include <linux/panic_notifier.h>
 #include <linux/printk.h>
+#include <linux/reboot.h>
 #include <linux/string.h>
 
 #include <asm/platform.h>
@@ -36,14 +37,20 @@ void platform_power_off(void)
 	simc_exit(0);
 }
 
-void platform_restart(void)
+static int iss_restart(struct notifier_block *this,
+		       unsigned long event, void *ptr)
 {
 	/* Flush and reset the mmu, simulate a processor reset, and
 	 * jump to the reset vector. */
 	cpu_reset();
-	/* control never gets here */
+
+	return NOTIFY_DONE;
 }
 
+static struct notifier_block iss_restart_block = {
+	.notifier_call = iss_restart,
+};
+
 static int
 iss_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
 {
@@ -82,4 +89,5 @@ void __init platform_setup(char **p_cmdline)
 	}
 
 	atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block);
+	register_restart_handler(&iss_restart_block);
 }
diff --git a/arch/xtensa/platforms/xt2000/setup.c b/arch/xtensa/platforms/xt2000/setup.c
index dc187684203b..71b57ab50599 100644
--- a/arch/xtensa/platforms/xt2000/setup.c
+++ b/arch/xtensa/platforms/xt2000/setup.c
@@ -56,14 +56,20 @@ void platform_power_off(void)
 	while (1);
 }
 
-void platform_restart(void)
+static int xt2000_restart(struct notifier_block *this,
+			  unsigned long event, void *ptr)
 {
 	/* Flush and reset the mmu, simulate a processor reset, and
 	 * jump to the reset vector. */
 	cpu_reset();
-	/* control never gets here */
+
+	return NOTIFY_DONE;
 }
 
+static struct notifier_block xt2000_restart_block = {
+	.notifier_call = xt2000_restart,
+};
+
 void __init platform_setup(char** cmdline)
 {
 	led_print (0, "LINUX   ");
@@ -140,6 +146,7 @@ static int __init xt2000_setup_devinit(void)
 	platform_device_register(&xt2000_serial8250_device);
 	platform_device_register(&xt2000_sonic_device);
 	mod_timer(&heartbeat_timer, jiffies + HZ / 2);
+	register_restart_handler(&xt2000_restart_block);
 	return 0;
 }
 
diff --git a/arch/xtensa/platforms/xtfpga/setup.c b/arch/xtensa/platforms/xtfpga/setup.c
index c79c1d09ea86..1690232c003e 100644
--- a/arch/xtensa/platforms/xtfpga/setup.c
+++ b/arch/xtensa/platforms/xtfpga/setup.c
@@ -49,7 +49,8 @@ void platform_power_off(void)
 		cpu_relax();
 }
 
-void platform_restart(void)
+static int xtfpga_restart(struct notifier_block *this,
+			  unsigned long event, void *ptr)
 {
 	/* Try software reset first. */
 	WRITE_ONCE(*(u32 *)XTFPGA_SWRST_VADDR, 0xdead);
@@ -58,9 +59,14 @@ void platform_restart(void)
 	 * simulate a processor reset, and jump to the reset vector.
 	 */
 	cpu_reset();
-	/* control never gets here */
+
+	return NOTIFY_DONE;
 }
 
+static struct notifier_block xtfpga_restart_block = {
+	.notifier_call = xtfpga_restart,
+};
+
 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
 
 void __init platform_calibrate_ccount(void)
@@ -70,6 +76,11 @@ void __init platform_calibrate_ccount(void)
 
 #endif
 
+static void __init xtfpga_register_handlers(void)
+{
+	register_restart_handler(&xtfpga_restart_block);
+}
+
 #ifdef CONFIG_USE_OF
 
 static void __init xtfpga_clk_setup(struct device_node *np)
@@ -134,6 +145,9 @@ static int __init machine_setup(void)
 	if ((eth = of_find_compatible_node(eth, NULL, "opencores,ethoc")))
 		update_local_mac(eth);
 	of_node_put(eth);
+
+	xtfpga_register_handlers();
+
 	return 0;
 }
 arch_initcall(machine_setup);
@@ -281,6 +295,8 @@ static int __init xtavnet_init(void)
 	pr_info("XTFPGA: Ethernet MAC %pM\n", ethoc_pdata.hwaddr);
 	ethoc_pdata.eth_clkfreq = *(long *)XTFPGA_CLKFRQ_VADDR;
 
+	xtfpga_register_handlers();
+
 	return 0;
 }