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
--- a/arch/sh/boards/mach-sdk7786/setup.c
+++ b/arch/sh/boards/mach-sdk7786/setup.c
@@ -165,6 +165,19 @@
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 @@
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
--- 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
