omap: mailbox: correct OMAP4 reset logic

OMAP4 mailbox has a different register set. There is
no MAILBOX_SYSSTATUS register. The reset is indicated
with the SOFTRESET bit of the MAILBOX_SYSCONFIG register
itself. This bit should read 0 for a successful Reset.
Also, the SOFTRESET bit occupies bit0 and not bit1 as with
previous generations.

Signed-off-by: Suman Anna <s-anna@ti.com>
Acked-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 27 insertions, 11 deletions

diff --git a/arch/arm/mach-omap2/mailbox.c b/arch/arm/mach-omap2/mailbox.c
index 2c9fd1c2a7c7..6519716571cb 100644
--- a/arch/arm/mach-omap2/mailbox.c
+++ b/arch/arm/mach-omap2/mailbox.c
@@ -40,6 +40,7 @@
 #define AUTOIDLE        (1 << 0)
 #define SOFTRESET       (1 << 1)
 #define SMARTIDLE       (2 << 3)
+#define OMAP4_SOFTRESET (1 << 0)
 
 /* SYSSTATUS: register bit definition */
 #define RESETDONE       (1 << 0)
@@ -99,17 +100,32 @@ static int omap2_mbox_startup(struct omap_mbox *mbox)
         }
         clk_enable(mbox_ick_handle);
 
-        mbox_write_reg(SOFTRESET, MAILBOX_SYSCONFIG);
-        timeout = jiffies + msecs_to_jiffies(20);
-        do {
-                l = mbox_read_reg(MAILBOX_SYSSTATUS);
-                if (l & RESETDONE)
-                        break;
-        } while (!time_after(jiffies, timeout));
-
-        if (!(l & RESETDONE)) {
-                pr_err("Can't take mmu out of reset\n");
-                return -ENODEV;
+        if (cpu_is_omap44xx()) {
+                mbox_write_reg(OMAP4_SOFTRESET, MAILBOX_SYSCONFIG);
+                timeout = jiffies + msecs_to_jiffies(20);
+                do {
+                        l = mbox_read_reg(MAILBOX_SYSCONFIG);
+                        if (!(l & OMAP4_SOFTRESET))
+                                break;
+                } while (!time_after(jiffies, timeout));
+
+                if (l & OMAP4_SOFTRESET) {
+                        pr_err("Can't take mailbox out of reset\n");
+                        return -ENODEV;
+                }
+        } else {
+                mbox_write_reg(SOFTRESET, MAILBOX_SYSCONFIG);
+                timeout = jiffies + msecs_to_jiffies(20);
+                do {
+                        l = mbox_read_reg(MAILBOX_SYSSTATUS);
+                        if (l & RESETDONE)
+                                break;
+                } while (!time_after(jiffies, timeout));
+
+                if (!(l & RESETDONE)) {
+                        pr_err("Can't take mailbox out of reset\n");
+                        return -ENODEV;
+                }
         }
 
         l = mbox_read_reg(MAILBOX_REVISION);