memstick: allow "set_param" method to return an error code

[linux-2.6] / drivers / memstick / host / jmb38x_ms.c

diff --git a/drivers/memstick/host/jmb38x_ms.c b/drivers/memstick/host/jmb38x_ms.c
index 4e3bfbcdf155d9cadfc2d1ea06c35911cd3c7c11..9d82e67737db5c06e23c3ec726bd71ca11653d22 100644 (file)
--- a/drivers/memstick/host/jmb38x_ms.c
+++ b/drivers/memstick/host/jmb38x_ms.c
@@ -609,36 +609,68 @@ static void jmb38x_ms_request(struct memstick_host *msh)
        spin_unlock_irqrestore(&host->lock, flags);
 }
 
-static void jmb38x_ms_reset(struct jmb38x_ms_host *host)
+static int jmb38x_ms_reset(struct jmb38x_ms_host *host)
 {
-       unsigned int host_ctl = readl(host->addr + HOST_CONTROL);
+       int cnt;
 
-       writel(HOST_CONTROL_RESET_REQ, host->addr + HOST_CONTROL);
+       writel(HOST_CONTROL_RESET_REQ | HOST_CONTROL_CLOCK_EN
+              | readl(host->addr + HOST_CONTROL),
+              host->addr + HOST_CONTROL);
+       mmiowb();
+
+       for (cnt = 0; cnt < 20; ++cnt) {
+               if (!(HOST_CONTROL_RESET_REQ
+                     & readl(host->addr + HOST_CONTROL)))
+                       goto reset_next;
 
-       while (HOST_CONTROL_RESET_REQ
-              & (host_ctl = readl(host->addr + HOST_CONTROL))) {
                ndelay(20);
-               dev_dbg(&host->chip->pdev->dev, "reset %08x\n", host_ctl);
        }
+       dev_dbg(&host->chip->pdev->dev, "reset_req timeout\n");
+       return -EIO;
 
-       writel(HOST_CONTROL_RESET, host->addr + HOST_CONTROL);
+reset_next:
+       writel(HOST_CONTROL_RESET | HOST_CONTROL_CLOCK_EN
+              | readl(host->addr + HOST_CONTROL),
+              host->addr + HOST_CONTROL);
+       mmiowb();
+
+       for (cnt = 0; cnt < 20; ++cnt) {
+               if (!(HOST_CONTROL_RESET
+                     & readl(host->addr + HOST_CONTROL)))
+                       goto reset_ok;
+
+               ndelay(20);
+       }
+       dev_dbg(&host->chip->pdev->dev, "reset timeout\n");
+       return -EIO;
+
+reset_ok:
        mmiowb();
        writel(INT_STATUS_ALL, host->addr + INT_SIGNAL_ENABLE);
        writel(INT_STATUS_ALL, host->addr + INT_STATUS_ENABLE);
+       return 0;
 }
 
-static void jmb38x_ms_set_param(struct memstick_host *msh,
-                               enum memstick_param param,
-                               int value)
+static int jmb38x_ms_set_param(struct memstick_host *msh,
+                              enum memstick_param param,
+                              int value)
 {
        struct jmb38x_ms_host *host = memstick_priv(msh);
        unsigned int host_ctl = readl(host->addr + HOST_CONTROL);
        unsigned int clock_ctl = CLOCK_CONTROL_40MHZ, clock_delay = 0;
+       int rc = 0;
 
        switch (param) {
        case MEMSTICK_POWER:
                if (value == MEMSTICK_POWER_ON) {
-                       jmb38x_ms_reset(host);
+                       rc = jmb38x_ms_reset(host);
+                       if (rc)
+                               return rc;
+
+                       host_ctl = 7;
+                       host_ctl |= HOST_CONTROL_POWER_EN
+                                | HOST_CONTROL_CLOCK_EN;
+                       writel(host_ctl, host->addr + HOST_CONTROL);
 
                        writel(host->id ? PAD_PU_PD_ON_MS_SOCK1
                                        : PAD_PU_PD_ON_MS_SOCK0,
@@ -647,11 +679,7 @@ static void jmb38x_ms_set_param(struct memstick_host *msh,
                        writel(PAD_OUTPUT_ENABLE_MS,
                               host->addr + PAD_OUTPUT_ENABLE);
 
-                       host_ctl = 7;
-                       host_ctl |= HOST_CONTROL_POWER_EN
-                                | HOST_CONTROL_CLOCK_EN;
-                       writel(host_ctl, host->addr + HOST_CONTROL);
-
+                       msleep(10);
                        dev_dbg(&host->chip->pdev->dev, "power on\n");
                } else if (value == MEMSTICK_POWER_OFF) {
                        host_ctl &= ~(HOST_CONTROL_POWER_EN
@@ -660,7 +688,8 @@ static void jmb38x_ms_set_param(struct memstick_host *msh,
                        writel(0, host->addr + PAD_OUTPUT_ENABLE);
                        writel(PAD_PU_PD_OFF, host->addr + PAD_PU_PD);
                        dev_dbg(&host->chip->pdev->dev, "power off\n");
-               }
+               } else
+                       return -EINVAL;
                break;
        case MEMSTICK_INTERFACE:
                host_ctl &= ~(3 << HOST_CONTROL_IF_SHIFT);
@@ -686,12 +715,14 @@ static void jmb38x_ms_set_param(struct memstick_host *msh,
                        host_ctl &= ~HOST_CONTROL_REI;
                        clock_ctl = CLOCK_CONTROL_60MHZ;
                        clock_delay = 0;
-               }
+               } else
+                       return -EINVAL;
                writel(host_ctl, host->addr + HOST_CONTROL);
                writel(clock_ctl, host->addr + CLOCK_CONTROL);
                writel(clock_delay, host->addr + CLOCK_DELAY);
                break;
        };
+       return 0;
 }
 
 #ifdef CONFIG_PM