ARM: OMAP: Allow platforms to hook reset cleanly

This adds a clean method to allow platforms to hook into the reset
code if they require to.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>

3 files changed, 85 insertions, 48 deletions

diff --git a/arch/arm/mach-omap1/Makefile b/arch/arm/mach-omap1/Makefile
index ba6009f27677..af98117043d2 100644
--- a/arch/arm/mach-omap1/Makefile
+++ b/arch/arm/mach-omap1/Makefile
@@ -4,7 +4,7 @@
 
 # Common support
 obj-y := io.o id.o sram.o time.o irq.o mux.o flash.o serial.o devices.o dma.o
-obj-y += clock.o clock_data.o opp_data.o
+obj-y += clock.o clock_data.o opp_data.o reset.o
 
 obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o
 
diff --git a/arch/arm/mach-omap1/board-voiceblue.c b/arch/arm/mach-omap1/board-voiceblue.c
index 815a69ce821d..671281714099 100644
--- a/arch/arm/mach-omap1/board-voiceblue.c
+++ b/arch/arm/mach-omap1/board-voiceblue.c
@@ -26,6 +26,7 @@
 #include <linux/smc91x.h>
 
 #include <mach/hardware.h>
+#include <mach/system.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -163,52 +164,6 @@ static void __init voiceblue_init_irq(void)
         omap_init_irq();
 }
 
-static void __init voiceblue_init(void)
-{
-        /* mux pins for uarts */
-        omap_cfg_reg(UART1_TX);
-        omap_cfg_reg(UART1_RTS);
-        omap_cfg_reg(UART2_TX);
-        omap_cfg_reg(UART2_RTS);
-        omap_cfg_reg(UART3_TX);
-        omap_cfg_reg(UART3_RX);
-
-        /* Watchdog */
-        gpio_request(0, "Watchdog");
-        /* smc91x reset */
-        gpio_request(7, "SMC91x reset");
-        gpio_direction_output(7, 1);
-        udelay(2);      /* wait at least 100ns */
-        gpio_set_value(7, 0);
-        mdelay(50);     /* 50ms until PHY ready */
-        /* smc91x interrupt pin */
-        gpio_request(8, "SMC91x irq");
-        /* 16C554 reset*/
-        gpio_request(6, "16C554 reset");
-        gpio_direction_output(6, 0);
-        /* 16C554 interrupt pins */
-        gpio_request(12, "16C554 irq");
-        gpio_request(13, "16C554 irq");
-        gpio_request(14, "16C554 irq");
-        gpio_request(15, "16C554 irq");
-        set_irq_type(gpio_to_irq(12), IRQ_TYPE_EDGE_RISING);
-        set_irq_type(gpio_to_irq(13), IRQ_TYPE_EDGE_RISING);
-        set_irq_type(gpio_to_irq(14), IRQ_TYPE_EDGE_RISING);
-        set_irq_type(gpio_to_irq(15), IRQ_TYPE_EDGE_RISING);
-
-        platform_add_devices(voiceblue_devices, ARRAY_SIZE(voiceblue_devices));
-        omap_board_config = voiceblue_config;
-        omap_board_config_size = ARRAY_SIZE(voiceblue_config);
-        omap_serial_init();
-        omap1_usb_init(&voiceblue_usb_config);
-        omap_register_i2c_bus(1, 100, NULL, 0);
-
-        /* There is a good chance board is going up, so enable power LED
-         * (it is connected through invertor) */
-        omap_writeb(0x00, OMAP_LPG1_LCR);
-        omap_writeb(0x00, OMAP_LPG1_PMR);       /* Disable clock */
-}
-
 static void __init voiceblue_map_io(void)
 {
         omap1_map_common_io();
@@ -275,8 +230,17 @@ void voiceblue_wdt_ping(void)
         gpio_set_value(0, wdt_gpio_state);
 }
 
-void voiceblue_reset(void)
+static void voiceblue_reset(char mode, const char *cmd)
 {
+        /*
+         * Workaround for 5912/1611b bug mentioned in sprz209d.pdf p. 28
+         * "Global Software Reset Affects Traffic Controller Frequency".
+         */
+        if (cpu_is_omap5912()) {
+                omap_writew(omap_readw(DPLL_CTL) & ~(1 << 4), DPLL_CTL);
+                omap_writew(0x8, ARM_RSTCT1);
+        }
+
         set_bit(MACHINE_REBOOT, &machine_state);
         voiceblue_wdt_enable();
         while (1) ;
@@ -286,6 +250,54 @@ EXPORT_SYMBOL(voiceblue_wdt_enable);
 EXPORT_SYMBOL(voiceblue_wdt_disable);
 EXPORT_SYMBOL(voiceblue_wdt_ping);
 
+static void __init voiceblue_init(void)
+{
+        /* mux pins for uarts */
+        omap_cfg_reg(UART1_TX);
+        omap_cfg_reg(UART1_RTS);
+        omap_cfg_reg(UART2_TX);
+        omap_cfg_reg(UART2_RTS);
+        omap_cfg_reg(UART3_TX);
+        omap_cfg_reg(UART3_RX);
+
+        /* Watchdog */
+        gpio_request(0, "Watchdog");
+        /* smc91x reset */
+        gpio_request(7, "SMC91x reset");
+        gpio_direction_output(7, 1);
+        udelay(2);      /* wait at least 100ns */
+        gpio_set_value(7, 0);
+        mdelay(50);     /* 50ms until PHY ready */
+        /* smc91x interrupt pin */
+        gpio_request(8, "SMC91x irq");
+        /* 16C554 reset*/
+        gpio_request(6, "16C554 reset");
+        gpio_direction_output(6, 0);
+        /* 16C554 interrupt pins */
+        gpio_request(12, "16C554 irq");
+        gpio_request(13, "16C554 irq");
+        gpio_request(14, "16C554 irq");
+        gpio_request(15, "16C554 irq");
+        set_irq_type(gpio_to_irq(12), IRQ_TYPE_EDGE_RISING);
+        set_irq_type(gpio_to_irq(13), IRQ_TYPE_EDGE_RISING);
+        set_irq_type(gpio_to_irq(14), IRQ_TYPE_EDGE_RISING);
+        set_irq_type(gpio_to_irq(15), IRQ_TYPE_EDGE_RISING);
+
+        platform_add_devices(voiceblue_devices, ARRAY_SIZE(voiceblue_devices));
+        omap_board_config = voiceblue_config;
+        omap_board_config_size = ARRAY_SIZE(voiceblue_config);
+        omap_serial_init();
+        omap1_usb_init(&voiceblue_usb_config);
+        omap_register_i2c_bus(1, 100, NULL, 0);
+
+        /* There is a good chance board is going up, so enable power LED
+         * (it is connected through invertor) */
+        omap_writeb(0x00, OMAP_LPG1_LCR);
+        omap_writeb(0x00, OMAP_LPG1_PMR);       /* Disable clock */
+
+        arch_reset = voiceblue_reset;
+}
+
 MACHINE_START(VOICEBLUE, "VoiceBlue OMAP5910")
         /* Maintainer: Ladislav Michl <michl@2n.cz> */
         .boot_params    = 0x10000100,
diff --git a/arch/arm/mach-omap1/reset.c b/arch/arm/mach-omap1/reset.c
new file mode 100644
index 000000000000..ad951ee69205
--- /dev/null
+++ b/arch/arm/mach-omap1/reset.c
@@ -0,0 +1,25 @@
+/*
+ * OMAP1 reset support
+ */
+#include <linux/kernel.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/system.h>
+#include <plat/prcm.h>
+
+void omap1_arch_reset(char mode, const char *cmd)
+{
+        /*
+         * Workaround for 5912/1611b bug mentioned in sprz209d.pdf p. 28
+         * "Global Software Reset Affects Traffic Controller Frequency".
+         */
+        if (cpu_is_omap5912()) {
+                omap_writew(omap_readw(DPLL_CTL) & ~(1 << 4), DPLL_CTL);
+                omap_writew(0x8, ARM_RSTCT1);
+        }
+
+        omap_writew(1, ARM_RSTCT1);
+}
+
+void (*arch_reset)(char, const char *) = omap1_arch_reset;