sh: mach-sdk7786: pm_power_off support.

This wires up power-off support for the SDK7786 board.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/boards/mach-sdk7786/setup.c b/arch/sh/boards/mach-sdk7786/setup.c
index f094ea2..0c057a9 100644 (file)
--- a/arch/sh/boards/mach-sdk7786/setup.c
+++ b/arch/sh/boards/mach-sdk7786/setup.c
@@ -165,6 +165,19 @@ static void sdk7786_restart(char *cmd)
        fpga_write_reg(0xa5a5, SRSTR);
 }
 
+static void sdk7786_power_off(void)
+{
+       fpga_write_reg(fpga_read_reg(PWRCR) | PWRCR_PDWNREQ, PWRCR);
+
+       /*
+        * It can take up to 20us for the R8C to do its job, back off and
+        * wait a bit until we've been shut off. Even though newer FPGA
+        * versions don't set the ACK bit, the latency issue remains.
+        */
+       while ((fpga_read_reg(PWRCR) & PWRCR_PDWNACK) == 0)
+               cpu_sleep();
+}
+
 /* Initialize the board */
 static void __init sdk7786_setup(char **cmdline_p)
 {
@@ -175,6 +188,7 @@ static void __init sdk7786_setup(char **cmdline_p)
        pr_info("\tPCB revision:\t%d\n", fpga_read_reg(PCBRR) & 0xf);
 
        machine_ops.restart = sdk7786_restart;
+       pm_power_off = sdk7786_power_off;
 }
 
 /*

diff --git a/arch/sh/include/mach-sdk7786/mach/fpga.h b/arch/sh/include/mach-sdk7786/mach/fpga.h
index 2120d67..416b621 100644 (file)
--- a/arch/sh/include/mach-sdk7786/mach/fpga.h
+++ b/arch/sh/include/mach-sdk7786/mach/fpga.h
@@ -42,6 +42,15 @@
 #define  SCBR_I2CCEN   BIT(1)  /* CPU I2C master enable */
 
 #define PWRCR          0x1a0
+#define  PWRCR_SCISEL0 BIT(0)
+#define  PWRCR_SCISEL1 BIT(1)
+#define  PWRCR_SCIEN   BIT(2)  /* Serial port enable */
+#define  PWRCR_PDWNACK BIT(5)  /* Power down acknowledge */
+#define  PWRCR_PDWNREQ BIT(7)  /* Power down request */
+#define  PWRCR_INT2    BIT(11) /* INT2 connection to power manager */
+#define  PWRCR_BUPINIT BIT(13) /* DDR backup initialize */
+#define  PWRCR_BKPRST  BIT(15) /* Backup power reset */
+
 #define SPCBR          0x1b0
 #define SPICR          0x1c0
 #define SPIDR          0x1d0