rtc: Add drivers/rtc/rtc-mrst.c

Provide the standard kernel rtc driver interface on top of the vrtc layer
added in the previous patch.

Signed-off-by: Feng Tang <feng.tang@intel.com>
LKML-Reference: <20101110172911.3311.20593.stgit@localhost.localdomain>
[Fixed swapped arguments on IPC]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
[Cleaned up and the device creation moved to arch/x86/platform]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 46 insertions, 0 deletions

diff --git a/arch/x86/platform/mrst/vrtc.c b/arch/x86/platform/mrst/vrtc.c
index 4944bd521d2c..4d3f770456f7 100644
--- a/arch/x86/platform/mrst/vrtc.c
+++ b/arch/x86/platform/mrst/vrtc.c
@@ -20,6 +20,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/sfi.h>
+#include <linux/platform_device.h>
 
 #include <asm/mrst.h>
 #include <asm/mrst-vrtc.h>
@@ -118,3 +119,48 @@ void __init mrst_rtc_init(void)
         x86_platform.get_wallclock = vrtc_get_time;
         x86_platform.set_wallclock = vrtc_set_mmss;
 }
+
+/*
+ * The Moorestown platform has a memory mapped virtual RTC device that emulates
+ * the programming interface of the RTC.
+ */
+
+static struct resource vrtc_resources[] = {
+        [0] = {
+                .flags  = IORESOURCE_MEM,
+        },
+        [1] = {
+                .flags  = IORESOURCE_IRQ,
+        }
+};
+
+static struct platform_device vrtc_device = {
+        .name           = "rtc_mrst",
+        .id             = -1,
+        .resource       = vrtc_resources,
+        .num_resources  = ARRAY_SIZE(vrtc_resources),
+};
+
+/* Register the RTC device if appropriate */
+static int __init mrst_device_create(void)
+{
+        /* No Moorestown, no device */
+        if (!mrst_identify_cpu())
+                return -ENODEV;
+        /* No timer, no device */
+        if (!sfi_mrtc_num)
+                return -ENODEV;
+
+        /* iomem resource */
+        vrtc_resources[0].start = sfi_mrtc_array[0].phys_addr;
+        vrtc_resources[0].end = sfi_mrtc_array[0].phys_addr +
+                                MRST_VRTC_MAP_SZ;
+        /* irq resource */
+        vrtc_resources[1].start = sfi_mrtc_array[0].irq;
+        vrtc_resources[1].end = sfi_mrtc_array[0].irq;
+
+        platform_device_register(&vrtc_device);
+        return 0;
+}
+
+module_init(mrst_device_create);