realtek: Remove _machine_restart and _machine_halt

By dropping _machine_restart, users can provide more reliable or
device-specific restart modes.

_machine_halt was already removed in commit f4b687d1 ("realtek: use
kernel defined halt"), but quietly reintroduced in commit 8faffa00
("realtek: add support for the RTL9300 timer"). Let's remove it again.

Signed-off-by: Sander Vanheule <sander@svanheule.net>
Tested-by: Stijn Segers <foss@volatilesystems.org>
Tested-by: Paul Fertser <fercerpav@gmail.com>
Tested-by: Stijn Tintel <stijn@linux-ipv6.be>

target/linux/realtek/files-5.10/arch/mips/rtl838x/setup.c

@@ -20,7 +20,6 @@
 #include <asm/addrspace.h>
 #include <asm/io.h>
 #include <asm/bootinfo.h>
-#include <asm/reboot.h>
 #include <asm/time.h>
 #include <asm/prom.h>
 #include <asm/smp-ops.h>
@@ -29,100 +28,20 @@
 
 extern struct rtl83xx_soc_info soc_info;
 
-u32 pll_reset_value;
-
-static void rtl838x_restart(char *command)
-{
-	u32 pll = sw_r32(RTL838X_PLL_CML_CTRL);
-
-	pr_info("System restart.\n");
-	pr_info("PLL control register: %x, applying reset value %x\n",
-		pll, pll_reset_value);
-
-	sw_w32(3, RTL838X_INT_RW_CTRL);
-	sw_w32(pll_reset_value, RTL838X_PLL_CML_CTRL);
-	sw_w32(0, RTL838X_INT_RW_CTRL);
-
-	/* Reset Global Control1 Register */
-	sw_w32(1, RTL838X_RST_GLB_CTRL_1);
-}
-
-static void rtl839x_restart(char *command)
-{
-	/* SoC reset vector (in flash memory): on RTL839x platform preferred way to reset */
-	void (*f)(void) = (void *) 0xbfc00000;
-
-	pr_info("System restart.\n");
-	/* Reset SoC */
-	sw_w32(0xFFFFFFFF, RTL839X_RST_GLB_CTRL);
-	/* and call reset vector */
-	f();
-	/* If this fails, halt the CPU */
-	while
-		(1);
-}
-
-static void rtl930x_restart(char *command)
-{
-	pr_info("System restart.\n");
-	sw_w32(0x1, RTL930X_RST_GLB_CTRL_0);
-	while
-		(1);
-}
-
-static void rtl931x_restart(char *command)
-{
-	u32 v;
-
-	pr_info("System restart.\n");
-	sw_w32(1, RTL931X_RST_GLB_CTRL);
-	v = sw_r32(RTL931X_RST_GLB_CTRL);
-	sw_w32(0x101, RTL931X_RST_GLB_CTRL);
-	msleep(15);
-	sw_w32(v, RTL931X_RST_GLB_CTRL);
-	msleep(15);
-	sw_w32(0x101, RTL931X_RST_GLB_CTRL);
-}
-
-static void rtl838x_halt(void)
-{
-	pr_info("System halted.\n");
-	while
-		(1);
-}
-
 static void __init rtl838x_setup(void)
 {
-	pr_info("Registering _machine_restart\n");
-	_machine_restart = rtl838x_restart;
-	_machine_halt = rtl838x_halt;
-
-	/* This PLL value needs to be restored before a reset and will then be
-	 * preserved over a SoC reset. A wrong value prevents the SoC from
-	 * connecting to the SPI flash controller at boot and reading the
-	 * reset routine */
-	pll_reset_value = sw_r32(RTL838X_PLL_CML_CTRL);
-
 	/* Setup System LED. Bit 15 then allows to toggle it */
 	sw_w32_mask(0, 3 << 16, RTL838X_LED_GLB_CTRL);
 }
 
 static void __init rtl839x_setup(void)
 {
-	pr_info("Registering _machine_restart\n");
-	_machine_restart = rtl839x_restart;
-	_machine_halt = rtl838x_halt;
-
 	/* Setup System LED. Bit 14 of RTL839X_LED_GLB_CTRL then allows to toggle it */
 	sw_w32_mask(0, 3 << 15, RTL839X_LED_GLB_CTRL);
 }
 
 static void __init rtl930x_setup(void)
 {
-	pr_info("Registering _machine_restart\n");
-	_machine_restart = rtl930x_restart;
-	_machine_halt = rtl838x_halt;
-
 	if (soc_info.id == 0x9302)
 		sw_w32_mask(0, 3 << 13, RTL9302_LED_GLB_CTRL);
 	else
@@ -131,9 +50,6 @@ static void __init rtl930x_setup(void)
 
 static void __init rtl931x_setup(void)
 {
-	pr_info("Registering _machine_restart\n");
-	_machine_restart = rtl931x_restart;
-	_machine_halt = rtl838x_halt;
 	sw_w32_mask(0, 3 << 12, RTL931X_LED_GLB_CTRL);
 }
 
@@ -142,7 +58,6 @@ void __init plat_mem_setup(void)
 	void *dtb;
 
 	set_io_port_base(KSEG1);
-	_machine_restart = rtl838x_restart;
 
 	if (fw_passed_dtb) /* UHI interface */
 		dtb = (void *)fw_passed_dtb;