powerpc/86xx: Add power management support for MPC8610HPCD boards

This patch adds needed nodes and properties to support suspend/resume
on the MPC8610HPCD boards.

There is a dedicated switch (SW9) that is used to wake up the boards.
By default the SW9 button is routed to IRQ8, but could be re-routed
(via PIXIS) to sreset.

With 'no_console_suspend' kernel command line argument specified, the
board is also able to wakeup upon serial port input.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Scott Wood <scottwood@freescale.com> [dts]
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 44 insertions, 4 deletions

diff --git a/arch/powerpc/platforms/86xx/mpc8610_hpcd.c b/arch/powerpc/platforms/86xx/mpc8610_hpcd.c
index 627908a4cd77..5abe137f6309 100644
--- a/arch/powerpc/platforms/86xx/mpc8610_hpcd.c
+++ b/arch/powerpc/platforms/86xx/mpc8610_hpcd.c
@@ -19,6 +19,7 @@
 #include <linux/stddef.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
+#include <linux/interrupt.h>
 #include <linux/kdev_t.h>
 #include <linux/delay.h>
 #include <linux/seq_file.h>
@@ -41,10 +42,46 @@
 
 #include "mpc86xx.h"
 
+static struct device_node *pixis_node;
 static unsigned char *pixis_bdcfg0, *pixis_arch;
 
+#ifdef CONFIG_SUSPEND
+static irqreturn_t mpc8610_sw9_irq(int irq, void *data)
+{
+        pr_debug("%s: PIXIS' event (sw9/wakeup) IRQ handled\n", __func__);
+        return IRQ_HANDLED;
+}
+
+static void __init mpc8610_suspend_init(void)
+{
+        int irq;
+        int ret;
+
+        if (!pixis_node)
+                return;
+
+        irq = irq_of_parse_and_map(pixis_node, 0);
+        if (!irq) {
+                pr_err("%s: can't map pixis event IRQ.\n", __func__);
+                return;
+        }
+
+        ret = request_irq(irq, mpc8610_sw9_irq, 0, "sw9/wakeup", NULL);
+        if (ret) {
+                pr_err("%s: can't request pixis event IRQ: %d\n",
+                       __func__, ret);
+                irq_dispose_mapping(irq);
+        }
+
+        enable_irq_wake(irq);
+}
+#else
+static inline void mpc8610_suspend_init(void) { }
+#endif /* CONFIG_SUSPEND */
+
 static struct of_device_id __initdata mpc8610_ids[] = {
         { .compatible = "fsl,mpc8610-immr", },
+        { .compatible = "fsl,mpc8610-guts", },
         { .compatible = "simple-bus", },
         { .compatible = "gianfar", },
         {}
@@ -55,6 +92,9 @@ static int __init mpc8610_declare_of_platform_devices(void)
         /* Firstly, register PIXIS GPIOs. */
         simple_gpiochip_init("fsl,fpga-pixis-gpio-bank");
 
+        /* Enable wakeup on PIXIS' event IRQ. */
+        mpc8610_suspend_init();
+
         /* Without this call, the SSI device driver won't get probed. */
         of_platform_bus_probe(NULL, mpc8610_ids, NULL);
 
@@ -250,10 +290,10 @@ static void __init mpc86xx_hpcd_setup_arch(void)
         diu_ops.set_sysfs_monitor_port  = mpc8610hpcd_set_sysfs_monitor_port;
 #endif
 
-        np = of_find_compatible_node(NULL, NULL, "fsl,fpga-pixis");
-        if (np) {
-                of_address_to_resource(np, 0, &r);
-                of_node_put(np);
+        pixis_node = of_find_compatible_node(NULL, NULL, "fsl,fpga-pixis");
+        if (pixis_node) {
+                of_address_to_resource(pixis_node, 0, &r);
+                of_node_put(pixis_node);
                 pixis = ioremap(r.start, 32);
                 if (!pixis) {
                         printk(KERN_ERR "Err: can't map FPGA cfg register!\n");