diff options
| author | Suman Anna <s-anna@ti.com> | 2010-01-26 22:55:29 (GMT) |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2010-02-23 23:29:21 (GMT) |
| commit | a6a6022871b83ff31c34495709f53e3faef80976 (patch) | |
| tree | 415bd61021c60b70f9b7605d403db51823b159ee /arch/arm/mach-omap2/mailbox.c | |
| parent | 5772ca7d7897722e7ed4c476bafee0b07bd9193e (diff) | |
| download | linux-a6a6022871b83ff31c34495709f53e3faef80976.tar.xz | |
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>
Diffstat (limited to 'arch/arm/mach-omap2/mailbox.c')
| -rw-r--r-- | arch/arm/mach-omap2/mailbox.c | 38 |
1 files changed, 27 insertions, 11 deletions
diff --git a/arch/arm/mach-omap2/mailbox.c b/arch/arm/mach-omap2/mailbox.c index 2c9fd1c..6519716 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); |