From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/arm/mach-at91/pm.h | 107 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 arch/arm/mach-at91/pm.h

(limited to 'arch/arm/mach-at91/pm.h')

diff --git a/arch/arm/mach-at91/pm.h b/arch/arm/mach-at91/pm.h
new file mode 100644
index 00000000..ce9a2069
--- /dev/null
+++ b/arch/arm/mach-at91/pm.h
@@ -0,0 +1,107 @@
+#ifdef CONFIG_ARCH_AT91RM9200
+#include <mach/at91rm9200_mc.h>
+
+/*
+ * The AT91RM9200 goes into self-refresh mode with this command, and will
+ * terminate self-refresh automatically on the next SDRAM access.
+ *
+ * Self-refresh mode is exited as soon as a memory access is made, but we don't
+ * know for sure when that happens. However, we need to restore the low-power
+ * mode if it was enabled before going idle. Restoring low-power mode while
+ * still in self-refresh is "not recommended", but seems to work.
+ */
+
+static inline u32 sdram_selfrefresh_enable(void)
+{
+	u32 saved_lpr = at91_sys_read(AT91_SDRAMC_LPR);
+
+	at91_sys_write(AT91_SDRAMC_LPR, 0);
+	at91_sys_write(AT91_SDRAMC_SRR, 1);
+	return saved_lpr;
+}
+
+#define sdram_selfrefresh_disable(saved_lpr)	at91_sys_write(AT91_SDRAMC_LPR, saved_lpr)
+#define wait_for_interrupt_enable()		asm volatile ("mcr p15, 0, %0, c7, c0, 4" \
+								: : "r" (0))
+
+#elif defined(CONFIG_ARCH_AT91CAP9)
+#include <mach/at91cap9_ddrsdr.h>
+
+
+static inline u32 sdram_selfrefresh_enable(void)
+{
+	u32 saved_lpr, lpr;
+
+	saved_lpr = at91_ramc_read(0, AT91_DDRSDRC_LPR);
+
+	lpr = saved_lpr & ~AT91_DDRSDRC_LPCB;
+	at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr | AT91_DDRSDRC_LPCB_SELF_REFRESH);
+	return saved_lpr;
+}
+
+#define sdram_selfrefresh_disable(saved_lpr)	at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr)
+#define wait_for_interrupt_enable()		cpu_do_idle()
+
+#elif defined(CONFIG_ARCH_AT91SAM9G45)
+#include <mach/at91sam9_ddrsdr.h>
+
+/* We manage both DDRAM/SDRAM controllers, we need more than one value to
+ * remember.
+ */
+static u32 saved_lpr1;
+
+static inline u32 sdram_selfrefresh_enable(void)
+{
+	/* Those tow values allow us to delay self-refresh activation
+	 * to the maximum. */
+	u32 lpr0, lpr1;
+	u32 saved_lpr0;
+
+	saved_lpr1 = at91_ramc_read(1, AT91_DDRSDRC_LPR);
+	lpr1 = saved_lpr1 & ~AT91_DDRSDRC_LPCB;
+	lpr1 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
+
+	saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR);
+	lpr0 = saved_lpr0 & ~AT91_DDRSDRC_LPCB;
+	lpr0 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
+
+	/* self-refresh mode now */
+	at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0);
+	at91_ramc_write(1, AT91_DDRSDRC_LPR, lpr1);
+
+	return saved_lpr0;
+}
+
+#define sdram_selfrefresh_disable(saved_lpr0)	\
+	do { \
+		at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0); \
+		at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1); \
+	} while (0)
+#define wait_for_interrupt_enable()		cpu_do_idle()
+
+#else
+#include <mach/at91sam9_sdramc.h>
+
+#ifdef CONFIG_ARCH_AT91SAM9263
+/*
+ * FIXME either or both the SDRAM controllers (EB0, EB1) might be in use;
+ * handle those cases both here and in the Suspend-To-RAM support.
+ */
+#warning Assuming EB1 SDRAM controller is *NOT* used
+#endif
+
+static inline u32 sdram_selfrefresh_enable(void)
+{
+	u32 saved_lpr, lpr;
+
+	saved_lpr = at91_ramc_read(0, AT91_SDRAMC_LPR);
+
+	lpr = saved_lpr & ~AT91_SDRAMC_LPCB;
+	at91_ramc_write(0, AT91_SDRAMC_LPR, lpr | AT91_SDRAMC_LPCB_SELF_REFRESH);
+	return saved_lpr;
+}
+
+#define sdram_selfrefresh_disable(saved_lpr)	at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr)
+#define wait_for_interrupt_enable()		cpu_do_idle()
+
+#endif
-- 
cgit v1.2.3