MIPS: Alchemy: dbdma suspend/resume support.

Implement suspend/resume for DBDMA controller and its channels.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 76 insertions, 0 deletions

diff --git a/arch/mips/alchemy/common/dbdma.c b/arch/mips/alchemy/common/dbdma.c
index 601ee9180ee4..3ab6d80d150d 100644
--- a/arch/mips/alchemy/common/dbdma.c
+++ b/arch/mips/alchemy/common/dbdma.c
@@ -174,6 +174,11 @@ static dbdev_tab_t dbdev_tab[] = {
 
 #define DBDEV_TAB_SIZE  ARRAY_SIZE(dbdev_tab)
 
+#ifdef CONFIG_PM
+static u32 au1xxx_dbdma_pm_regs[NUM_DBDMA_CHANS + 1][8];
+#endif
+
+
 static chan_tab_t *chan_tab_ptr[NUM_DBDMA_CHANS];
 
 static dbdev_tab_t *find_dbdev_id(u32 id)
@@ -975,4 +980,64 @@ u32 au1xxx_dbdma_put_dscr(u32 chanid, au1x_ddma_desc_t *dscr)
         return nbytes;
 }
 
+#ifdef CONFIG_PM
+void au1xxx_dbdma_suspend(void)
+{
+        int i;
+        u32 addr;
+
+        addr = DDMA_GLOBAL_BASE;
+        au1xxx_dbdma_pm_regs[0][0] = au_readl(addr + 0x00);
+        au1xxx_dbdma_pm_regs[0][1] = au_readl(addr + 0x04);
+        au1xxx_dbdma_pm_regs[0][2] = au_readl(addr + 0x08);
+        au1xxx_dbdma_pm_regs[0][3] = au_readl(addr + 0x0c);
+
+        /* save channel configurations */
+        for (i = 1, addr = DDMA_CHANNEL_BASE; i < NUM_DBDMA_CHANS; i++) {
+                au1xxx_dbdma_pm_regs[i][0] = au_readl(addr + 0x00);
+                au1xxx_dbdma_pm_regs[i][1] = au_readl(addr + 0x04);
+                au1xxx_dbdma_pm_regs[i][2] = au_readl(addr + 0x08);
+                au1xxx_dbdma_pm_regs[i][3] = au_readl(addr + 0x0c);
+                au1xxx_dbdma_pm_regs[i][4] = au_readl(addr + 0x10);
+                au1xxx_dbdma_pm_regs[i][5] = au_readl(addr + 0x14);
+                au1xxx_dbdma_pm_regs[i][6] = au_readl(addr + 0x18);
+
+                /* halt channel */
+                au_writel(au1xxx_dbdma_pm_regs[i][0] & ~1, addr + 0x00);
+                au_sync();
+                while (!(au_readl(addr + 0x14) & 1))
+                        au_sync();
+
+                addr += 0x100;  /* next channel base */
+        }
+        /* disable channel interrupts */
+        au_writel(0, DDMA_GLOBAL_BASE + 0x0c);
+        au_sync();
+}
+
+void au1xxx_dbdma_resume(void)
+{
+        int i;
+        u32 addr;
+
+        addr = DDMA_GLOBAL_BASE;
+        au_writel(au1xxx_dbdma_pm_regs[0][0], addr + 0x00);
+        au_writel(au1xxx_dbdma_pm_regs[0][1], addr + 0x04);
+        au_writel(au1xxx_dbdma_pm_regs[0][2], addr + 0x08);
+        au_writel(au1xxx_dbdma_pm_regs[0][3], addr + 0x0c);
+
+        /* restore channel configurations */
+        for (i = 1, addr = DDMA_CHANNEL_BASE; i < NUM_DBDMA_CHANS; i++) {
+                au_writel(au1xxx_dbdma_pm_regs[i][0], addr + 0x00);
+                au_writel(au1xxx_dbdma_pm_regs[i][1], addr + 0x04);
+                au_writel(au1xxx_dbdma_pm_regs[i][2], addr + 0x08);
+                au_writel(au1xxx_dbdma_pm_regs[i][3], addr + 0x0c);
+                au_writel(au1xxx_dbdma_pm_regs[i][4], addr + 0x10);
+                au_writel(au1xxx_dbdma_pm_regs[i][5], addr + 0x14);
+                au_writel(au1xxx_dbdma_pm_regs[i][6], addr + 0x18);
+                au_sync();
+                addr += 0x100;  /* next channel base */
+        }
+}
+#endif  /* CONFIG_PM */
 #endif /* defined(CONFIG_SOC_AU1550) || defined(CONFIG_SOC_AU1200) */
diff --git a/arch/mips/alchemy/common/power.c b/arch/mips/alchemy/common/power.c
index f08312b10d04..f58e151b38d4 100644
--- a/arch/mips/alchemy/common/power.c
+++ b/arch/mips/alchemy/common/power.c
@@ -36,6 +36,9 @@
 
 #include <asm/uaccess.h>
 #include <asm/mach-au1x00/au1000.h>
+#if defined(CONFIG_SOC_AU1550) || defined(CONFIG_SOC_AU1200)
+#include <asm/mach-au1x00/au1xxx_dbdma.h>
+#endif
 
 #ifdef CONFIG_PM
 
@@ -156,6 +159,10 @@ static void save_core_regs(void)
         sleep_static_memctlr[3][0] = au_readl(MEM_STCFG3);
         sleep_static_memctlr[3][1] = au_readl(MEM_STTIME3);
         sleep_static_memctlr[3][2] = au_readl(MEM_STADDR3);
+
+#if defined(CONFIG_SOC_AU1550) || defined(CONFIG_SOC_AU1200)
+        au1xxx_dbdma_suspend();
+#endif
 }
 
 static void restore_core_regs(void)
@@ -221,6 +228,10 @@ static void restore_core_regs(void)
         }
 
         restore_au1xxx_intctl();
+
+#if defined(CONFIG_SOC_AU1550) || defined(CONFIG_SOC_AU1200)
+        au1xxx_dbdma_resume();
+#endif
 }
 
 unsigned long suspend_mode;