powerpc/qe: Implement QE driver for handling resume on MPC85xx

So far the driver is used to reset QE upon resume, which is needed on
85xx. Later we can move some QE initialization steps into probe().

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/qe_lib/qe.c b/arch/powerpc/sysdev/qe_lib/qe.c
index 4eaf2a96291..149393c02c3 100644
--- a/arch/powerpc/sysdev/qe_lib/qe.c
+++ b/arch/powerpc/sysdev/qe_lib/qe.c
@@ -27,6 +27,8 @@
 #include <linux/delay.h>
 #include <linux/ioport.h>
 #include <linux/crc32.h>
+#include <linux/mod_devicetable.h>
+#include <linux/of_platform.h>
 #include <asm/irq.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
@@ -647,3 +649,35 @@ unsigned int qe_get_num_of_snums(void)
         return num_of_snums;
 }
 EXPORT_SYMBOL(qe_get_num_of_snums);
+
+#if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC_85xx)
+static int qe_resume(struct of_device *ofdev)
+{
+        if (!qe_alive_during_sleep())
+                qe_reset();
+        return 0;
+}
+
+static int qe_probe(struct of_device *ofdev, const struct of_device_id *id)
+{
+        return 0;
+}
+
+static const struct of_device_id qe_ids[] = {
+        { .compatible = "fsl,qe", },
+        { },
+};
+
+static struct of_platform_driver qe_driver = {
+        .driver.name = "fsl-qe",
+        .match_table = qe_ids,
+        .probe = qe_probe,
+        .resume = qe_resume,
+};
+
+static int __init qe_drv_init(void)
+{
+        return of_register_platform_driver(&qe_driver);
+}
+device_initcall(qe_drv_init);
+#endif /* defined(CONFIG_SUSPEND) && defined(CONFIG_PPC_85xx) */