This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / sh / kernel / pm.c

diff --git a/arch/sh/kernel/pm.c b/arch/sh/kernel/pm.c
new file mode 100644 (file)
index 0000000..10ab62c
--- /dev/null
+++ b/arch/sh/kernel/pm.c
@@ -0,0 +1,88 @@
+/*
+ * Generic Power Management Routine
+ *
+ * Copyright (c) 2006 Andriy Skulysh <askulsyh@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License.
+ */
+#include <linux/suspend.h>
+#include <linux/delay.h>
+#include <linux/gfp.h>
+#include <asm/freq.h>
+#include <asm/io.h>
+#include <asm/watchdog.h>
+#include <asm/pm.h>
+
+#define INTR_OFFSET    0x600
+
+#define STBCR          0xffffff82
+#define STBCR2         0xffffff88
+
+#define STBCR_STBY     0x80
+#define STBCR_MSTP2    0x04
+
+#define MCR            0xffffff68
+#define RTCNT          0xffffff70
+
+#define MCR_RMODE      2
+#define MCR_RFSH       4
+
+void pm_enter(void)
+{
+       u8 stbcr, csr;
+       u16 frqcr, mcr;
+       u32 vbr_new, vbr_old;
+
+       set_bl_bit();
+
+       /* set wdt */
+       csr = sh_wdt_read_csr();
+       csr &= ~WTCSR_TME;
+       csr |= WTCSR_CKS_4096;
+       sh_wdt_write_csr(csr);
+       csr = sh_wdt_read_csr();
+       sh_wdt_write_cnt(0);
+
+       /* disable PLL1 */
+       frqcr = ctrl_inw(FRQCR);
+       frqcr &= ~(FRQCR_PLLEN | FRQCR_PSTBY);
+       ctrl_outw(frqcr, FRQCR);
+
+       /* enable standby */
+       stbcr = ctrl_inb(STBCR);
+       ctrl_outb(stbcr | STBCR_STBY | STBCR_MSTP2, STBCR);
+
+       /* set self-refresh */
+       mcr = ctrl_inw(MCR);
+       ctrl_outw(mcr & ~MCR_RFSH, MCR);
+
+       /* set interrupt handler */
+       asm volatile("stc vbr, %0" : "=r" (vbr_old));
+       vbr_new = get_zeroed_page(GFP_ATOMIC);
+       udelay(50);
+       memcpy((void*)(vbr_new + INTR_OFFSET),
+              &wakeup_start, &wakeup_end - &wakeup_start);
+       asm volatile("ldc %0, vbr" : : "r" (vbr_new));
+
+       ctrl_outw(0, RTCNT);
+       ctrl_outw(mcr | MCR_RFSH | MCR_RMODE, MCR);
+
+       cpu_sleep();
+
+       asm volatile("ldc %0, vbr" : : "r" (vbr_old));
+
+       free_page(vbr_new);
+
+       /* enable PLL1 */
+       frqcr = ctrl_inw(FRQCR);
+       frqcr |= FRQCR_PSTBY;
+       ctrl_outw(frqcr, FRQCR);
+       udelay(50);
+       frqcr |= FRQCR_PLLEN;
+       ctrl_outw(frqcr, FRQCR);
+
+       ctrl_outb(stbcr, STBCR);
+
+       clear_bl_bit();
+}