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>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/sh/boards/mach-sdk7786/setup.c b/arch/sh/boards/mach-sdk7786/setup.c
index f094ea2ee783..0c057a93fe29 100644
--- 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;
 }
 
 /*