MIPS: Alchemy: add sysdev for DBDMA PM.

Add a sysdev for DBDMA PM.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: http://patchwork.linux-mips.org/patch/1119/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 72 insertions, 40 deletions

diff --git a/arch/mips/alchemy/common/dbdma.c b/arch/mips/alchemy/common/dbdma.c
index 99ae84ce5af3..ca0506a8585a 100644
--- a/arch/mips/alchemy/common/dbdma.c
+++ b/arch/mips/alchemy/common/dbdma.c
@@ -36,6 +36,7 @@
 #include <linux/spinlock.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/sysdev.h>
 #include <asm/mach-au1x00/au1000.h>
 #include <asm/mach-au1x00/au1xxx_dbdma.h>
 
@@ -174,10 +175,6 @@ 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][6];
-#endif
-
 
 static chan_tab_t *chan_tab_ptr[NUM_DBDMA_CHANS];
 
@@ -960,29 +957,37 @@ u32 au1xxx_dbdma_put_dscr(u32 chanid, au1x_ddma_desc_t *dscr)
         return nbytes;
 }
 
-#ifdef CONFIG_PM
-void au1xxx_dbdma_suspend(void)
+
+struct alchemy_dbdma_sysdev {
+        struct sys_device sysdev;
+        u32 pm_regs[NUM_DBDMA_CHANS + 1][6];
+};
+
+static int alchemy_dbdma_suspend(struct sys_device *dev,
+                                 pm_message_t state)
 {
+        struct alchemy_dbdma_sysdev *sdev =
+                container_of(dev, struct alchemy_dbdma_sysdev, sysdev);
         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);
+        sdev->pm_regs[0][0] = au_readl(addr + 0x00);
+        sdev->pm_regs[0][1] = au_readl(addr + 0x04);
+        sdev->pm_regs[0][2] = au_readl(addr + 0x08);
+        sdev->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);
+                sdev->pm_regs[i][0] = au_readl(addr + 0x00);
+                sdev->pm_regs[i][1] = au_readl(addr + 0x04);
+                sdev->pm_regs[i][2] = au_readl(addr + 0x08);
+                sdev->pm_regs[i][3] = au_readl(addr + 0x0c);
+                sdev->pm_regs[i][4] = au_readl(addr + 0x10);
+                sdev->pm_regs[i][5] = au_readl(addr + 0x14);
 
                 /* halt channel */
-                au_writel(au1xxx_dbdma_pm_regs[i][0] & ~1, addr + 0x00);
+                au_writel(sdev->pm_regs[i][0] & ~1, addr + 0x00);
                 au_sync();
                 while (!(au_readl(addr + 0x14) & 1))
                         au_sync();
@@ -992,32 +997,65 @@ void au1xxx_dbdma_suspend(void)
         /* disable channel interrupts */
         au_writel(0, DDMA_GLOBAL_BASE + 0x0c);
         au_sync();
+
+        return 0;
 }
 
-void au1xxx_dbdma_resume(void)
+static int alchemy_dbdma_resume(struct sys_device *dev)
 {
+        struct alchemy_dbdma_sysdev *sdev =
+                container_of(dev, struct alchemy_dbdma_sysdev, sysdev);
         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);
+        au_writel(sdev->pm_regs[0][0], addr + 0x00);
+        au_writel(sdev->pm_regs[0][1], addr + 0x04);
+        au_writel(sdev->pm_regs[0][2], addr + 0x08);
+        au_writel(sdev->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(sdev->pm_regs[i][0], addr + 0x00);
+                au_writel(sdev->pm_regs[i][1], addr + 0x04);
+                au_writel(sdev->pm_regs[i][2], addr + 0x08);
+                au_writel(sdev->pm_regs[i][3], addr + 0x0c);
+                au_writel(sdev->pm_regs[i][4], addr + 0x10);
+                au_writel(sdev->pm_regs[i][5], addr + 0x14);
                 au_sync();
                 addr += 0x100;  /* next channel base */
         }
+
+        return 0;
+}
+
+static struct sysdev_class alchemy_dbdma_sysdev_class = {
+        .name           = "dbdma",
+        .suspend        = alchemy_dbdma_suspend,
+        .resume         = alchemy_dbdma_resume,
+};
+
+static int __init alchemy_dbdma_sysdev_init(void)
+{
+        struct alchemy_dbdma_sysdev *sdev;
+        int ret;
+
+        ret = sysdev_class_register(&alchemy_dbdma_sysdev_class);
+        if (ret)
+                return ret;
+
+        sdev = kzalloc(sizeof(struct alchemy_dbdma_sysdev), GFP_KERNEL);
+        if (!sdev)
+                return -ENOMEM;
+
+        sdev->sysdev.id = -1;
+        sdev->sysdev.cls = &alchemy_dbdma_sysdev_class;
+        ret = sysdev_register(&sdev->sysdev);
+        if (ret)
+                kfree(sdev);
+
+        return ret;
 }
-#endif  /* CONFIG_PM */
 
 static int __init au1xxx_dbdma_init(void)
 {
@@ -1046,6 +1084,11 @@ static int __init au1xxx_dbdma_init(void)
         else {
                 dbdma_initialized = 1;
                 printk(KERN_INFO "Alchemy DBDMA initialized\n");
+                ret = alchemy_dbdma_sysdev_init();
+                if (ret) {
+                        printk(KERN_ERR "DBDMA PM init failed\n");
+                        ret = 0;
+                }
         }
 
         return ret;
diff --git a/arch/mips/alchemy/common/power.c b/arch/mips/alchemy/common/power.c
index 11e5ec748414..14eb8c492da2 100644
--- a/arch/mips/alchemy/common/power.c
+++ b/arch/mips/alchemy/common/power.c
@@ -36,9 +36,6 @@
 
 #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
 
@@ -129,10 +126,6 @@ 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)
@@ -196,10 +189,6 @@ static void restore_core_regs(void)
                 au_writel(sleep_uart0_linectl, UART0_ADDR + UART_LCR); au_sync();
                 au_writel(sleep_uart0_clkdiv, UART0_ADDR + UART_CLK); au_sync();
         }
-
-#if defined(CONFIG_SOC_AU1550) || defined(CONFIG_SOC_AU1200)
-        au1xxx_dbdma_resume();
-#endif
 }
 
 void au_sleep(void)