[ARM] 4495/1: iop: combined watchdog timer driver for iop3xx and iop13xx

In order for this driver to be shared across the iop architectures the
iop3xx and iop13xx header files are modified to present a common interface
for the iop_wdt driver.

Details:
* iop13xx supports disabling the timer while iop3xx does not.  This requires
  a few 'compatibility' definitions in include/asm-arm/hardware/iop3xx.h to
  preclude adding #ifdef CONFIG_ARCH_IOP13XX blocks to the driver code.
* The heartbeat interval is derived from the internal bus clock rate, so this
  this patch also exports the tick rate to the iop_wdt driver.

Cc: Curt Bruns <curt.e.bruns@intel.com>
Cc: Peter Milne <peter.milne@d-tacq.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 33 insertions, 0 deletions

diff --git a/include/asm-arm/hardware/iop3xx.h b/include/asm-arm/hardware/iop3xx.h
index 81ca5d3e2bff..fb90b421f31c 100644
--- a/include/asm-arm/hardware/iop3xx.h
+++ b/include/asm-arm/hardware/iop3xx.h
@@ -194,6 +194,13 @@ extern int init_atu;
 #define IOP_TMR_PRIVILEGED 0x08
 #define IOP_TMR_RATIO_1_1  0x00
 
+/* Watchdog timer definitions */
+#define IOP_WDTCR_EN_ARM        0x1e1e1e1e
+#define IOP_WDTCR_EN            0xe1e1e1e1
+/* iop3xx does not support stopping the watchdog, so we just re-arm */
+#define IOP_WDTCR_DIS_ARM       (IOP_WDTCR_EN_ARM)
+#define IOP_WDTCR_DIS           (IOP_WDTCR_EN)
+
 /* Application accelerator unit  */
 #define IOP3XX_AAU_PHYS_BASE (IOP3XX_PERIPHERAL_PHYS_BASE + 0x800)
 #define IOP3XX_AAU_UPPER_PA (IOP3XX_AAU_PHYS_BASE + 0xa7)
@@ -274,6 +281,32 @@ static inline void write_tisr(u32 val)
         asm volatile("mcr p6, 0, %0, c6, c1, 0" : : "r" (val));
 }
 
+static inline u32 read_wdtcr(void)
+{
+        u32 val;
+        asm volatile("mrc p6, 0, %0, c7, c1, 0":"=r" (val));
+        return val;
+}
+static inline void write_wdtcr(u32 val)
+{
+        asm volatile("mcr p6, 0, %0, c7, c1, 0"::"r" (val));
+}
+
+extern unsigned long get_iop_tick_rate(void);
+
+/* only iop13xx has these registers, we define these to present a
+ * common register interface for the iop_wdt driver.
+ */
+#define IOP_RCSR_WDT    (0)
+static inline u32 read_rcsr(void)
+{
+        return 0;
+}
+static inline void write_wdtsr(u32 val)
+{
+        do { } while (0);
+}
+
 extern struct platform_device iop3xx_dma_0_channel;
 extern struct platform_device iop3xx_dma_1_channel;
 extern struct platform_device iop3xx_aau_channel;