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[PATCH] MIPS: Alchemy: add sysdev for DBDMA PM.

To: Linux-MIPS <linux-mips@linux-mips.org>
Subject: [PATCH] MIPS: Alchemy: add sysdev for DBDMA PM.
From: Manuel Lauss <manuel.lauss@googlemail.com>
Date: Wed, 14 Apr 2010 20:33:44 +0200
Cc: Manuel Lauss <manuel.lauss@gmail.com>
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Add a sysdev for DBDMA PM.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
---
Tested on DB1200; no changes since yesterday.  It works as intended
and per-channel sysdevs seem like overdoing it.

 arch/mips/alchemy/common/dbdma.c                 |  101 +++++++++++++++------
 arch/mips/alchemy/common/power.c                 |   11 ---
 arch/mips/include/asm/mach-au1x00/au1xxx_dbdma.h |    4 -
 3 files changed, 72 insertions(+), 44 deletions(-)

diff --git a/arch/mips/alchemy/common/dbdma.c b/arch/mips/alchemy/common/dbdma.c
index 99ae84c..ca0506a 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 e097094..5ef06a1 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)
diff --git a/arch/mips/include/asm/mach-au1x00/au1xxx_dbdma.h 
b/arch/mips/include/asm/mach-au1x00/au1xxx_dbdma.h
index 8c6b110..c8a553a 100644
--- a/arch/mips/include/asm/mach-au1x00/au1xxx_dbdma.h
+++ b/arch/mips/include/asm/mach-au1x00/au1xxx_dbdma.h
@@ -358,10 +358,6 @@ u32 au1xxx_dbdma_put_dscr(u32 chanid, au1x_ddma_desc_t 
*dscr);
 u32 au1xxx_ddma_add_device(dbdev_tab_t *dev);
 extern void au1xxx_ddma_del_device(u32 devid);
 void *au1xxx_ddma_get_nextptr_virt(au1x_ddma_desc_t *dp);
-#ifdef CONFIG_PM
-void au1xxx_dbdma_suspend(void);
-void au1xxx_dbdma_resume(void);
-#endif
 
 /*
  *     Flags for the put_source/put_dest functions.
-- 
1.7.0.4


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