[PATCH] ARM: OMAP: Re: OMAP macros for MTD_XIP

This patch defines OMAP macros for checking pending interrupts and
elapsed time.

diff --git a/include/asm-arm/arch-omap/mtd-xip.h b/include/asm-arm/arch-omap/mtd-xip.h
new file mode 100644 (file)
index 0000000..a73a285
--- /dev/null
+++ b/include/asm-arm/arch-omap/mtd-xip.h
@@ -0,0 +1,61 @@
+/*
+ * MTD primitives for XIP support. Architecture specific functions.
+ *
+ * Do not include this file directly. It's included from linux/mtd/xip.h
+ *
+ * Author: Vladimir Barinov <vbarinov@ru.mvista.com>
+ *
+ * (c) 2005 MontaVista Software, Inc.  This file is licensed under the
+ * terms of the GNU General Public License version 2.  This program is
+ * licensed "as is" without any warranty of any kind, whether express or
+ * implied.
+ */
+
+#ifndef __ARCH_OMAP_MTD_XIP_H__
+#define __ARCH_OMAP_MTD_XIP_H__
+
+#include <asm/hardware.h>
+#define OMAP_MPU_TIMER_BASE    (0xfffec500)
+#define OMAP_MPU_TIMER_OFFSET  0x100
+
+typedef struct {
+       u32 cntl;                       /* CNTL_TIMER, R/W */
+       u32 load_tim;                   /* LOAD_TIM,   W */
+       u32 read_tim;                   /* READ_TIM,   R */
+} xip_omap_mpu_timer_regs_t;
+
+#define xip_omap_mpu_timer_base(n)                                     \
+((volatile xip_omap_mpu_timer_regs_t*)IO_ADDRESS(OMAP_MPU_TIMER_BASE + \
+       (n)*OMAP_MPU_TIMER_OFFSET))
+
+static inline unsigned long xip_omap_mpu_timer_read(int nr)
+{
+       volatile xip_omap_mpu_timer_regs_t* timer = xip_omap_mpu_timer_base(nr);
+       return timer->read_tim;
+}
+
+#define xip_irqpending()       \
+       (omap_readl(OMAP_IH1_ITR) & ~omap_readl(OMAP_IH1_MIR))
+#define xip_currtime()         (~xip_omap_mpu_timer_read(0))
+
+/*
+ * It's permitted to do approxmation for xip_elapsed_since macro
+ * (see linux/mtd/xip.h)
+ */
+
+#ifdef CONFIG_MACH_OMAP_PERSEUS2
+#define xip_elapsed_since(x)   (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 7)
+#else
+#define xip_elapsed_since(x)   (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 6)
+#endif
+
+/*
+ * xip_cpu_idle() is used when waiting for a delay equal or larger than
+ * the system timer tick period.  This should put the CPU into idle mode
+ * to save power and to be woken up only when some interrupts are pending.
+ * As above, this should not rely upon standard kernel code.
+ */
+
+#define xip_cpu_idle()  asm volatile ("mcr p15, 0, %0, c7, c0, 4" :: "r" (1))
+
+#endif /* __ARCH_OMAP_MTD_XIP_H__ */