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>

1 files changed, 18 insertions, 2 deletions

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;
 }