[ARM] 3451/1: ep93xx: use the m48t86 rtc driver on the ts72xx platform

Patch from Lennert Buytenhek

Instantiate the recently merged m48t86 rtc driver in the ts72xx code.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 39 insertions, 0 deletions

diff --git a/arch/arm/mach-ep93xx/ts72xx.c b/arch/arm/mach-ep93xx/ts72xx.c
index 777e75daa8a5..9be01b0c3f48 100644
--- a/arch/arm/mach-ep93xx/ts72xx.c
+++ b/arch/arm/mach-ep93xx/ts72xx.c
@@ -17,6 +17,8 @@
 #include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/mtd/physmap.h>
+#include <linux/platform_device.h>
+#include <linux/m48t86.h>
 #include <asm/io.h>
 #include <asm/hardware.h>
 #include <asm/mach-types.h>
@@ -39,6 +41,16 @@ static struct map_desc ts72xx_io_desc[] __initdata = {
                 .pfn            = __phys_to_pfn(TS72XX_OPTIONS2_PHYS_BASE),
                 .length         = TS72XX_OPTIONS2_SIZE,
                 .type           = MT_DEVICE,
+        }, {
+                .virtual        = TS72XX_RTC_INDEX_VIRT_BASE,
+                .pfn            = __phys_to_pfn(TS72XX_RTC_INDEX_PHYS_BASE),
+                .length         = TS72XX_RTC_INDEX_SIZE,
+                .type           = MT_DEVICE,
+        }, {
+                .virtual        = TS72XX_RTC_DATA_VIRT_BASE,
+                .pfn            = __phys_to_pfn(TS72XX_RTC_DATA_PHYS_BASE),
+                .length         = TS72XX_RTC_DATA_SIZE,
+                .type           = MT_DEVICE,
         }
 };
 
@@ -99,11 +111,38 @@ static void __init ts72xx_map_io(void)
         }
 }
 
+static unsigned char ts72xx_rtc_readb(unsigned long addr)
+{
+        __raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
+        return __raw_readb(TS72XX_RTC_DATA_VIRT_BASE);
+}
+
+static void ts72xx_rtc_writeb(unsigned char value, unsigned long addr)
+{
+        __raw_writeb(addr, TS72XX_RTC_INDEX_VIRT_BASE);
+        __raw_writeb(value, TS72XX_RTC_DATA_VIRT_BASE);
+}
+
+static struct m48t86_ops ts72xx_rtc_ops = {
+        .readb                  = ts72xx_rtc_readb,
+        .writeb                 = ts72xx_rtc_writeb,
+};
+
+static struct platform_device ts72xx_rtc_device = {
+        .name                   = "rtc-m48t86",
+        .id                     = -1,
+        .dev                    = {
+                .platform_data          = &ts72xx_rtc_ops,
+        },
+        .num_resources          = 0,
+};
+
 static void __init ts72xx_init_machine(void)
 {
         ep93xx_init_devices();
         if (board_is_ts7200())
                 physmap_configure(TS72XX_NOR_PHYS_BASE, 0x01000000, 1, NULL);
+        platform_device_register(&ts72xx_rtc_device);
 }
 
 MACHINE_START(TS72XX, "Technologic Systems TS-72xx SBC")