diff options
| author | Hiroshi DOYU <Hiroshi.DOYU@nokia.com> | 2009-09-25 03:23:09 +0400 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2009-09-25 03:23:09 +0400 |
| commit | 1ffe627dcfce820b316ee520c58fca54550a18ee (patch) | |
| tree | f4a7b11226b0d54b4ddfd0bcd909167a29f1d1b7 /arch/arm/mach-omap2/mailbox.c | |
| parent | 41a03c539c6e3cc772fc15a827ea2aa040c9848d (diff) | |
| download | linux-1ffe627dcfce820b316ee520c58fca54550a18ee.tar.xz | |
omap: mailbox: Execute softreset at startup
The softreset at startup is introduced as TRM describes and also some
register bit definitions are added instead of magic number.
Signed-off-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 | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/arch/arm/mach-omap2/mailbox.c b/arch/arm/mach-omap2/mailbox.c index 6f71f3730c97..5bf9a2fdb682 100644 --- a/arch/arm/mach-omap2/mailbox.c +++ b/arch/arm/mach-omap2/mailbox.c @@ -30,6 +30,14 @@ #define MAILBOX_IRQ_NEWMSG(u) (1 << (2 * (u))) #define MAILBOX_IRQ_NOTFULL(u) (1 << (2 * (u) + 1)) +/* SYSCONFIG: register bit definition */ +#define AUTOIDLE (1 << 0) +#define SOFTRESET (1 << 1) +#define SMARTIDLE (2 << 3) + +/* SYSSTATUS: register bit definition */ +#define RESETDONE (1 << 0) + #define MBOX_REG_SIZE 0x120 #define MBOX_NR_REGS (MBOX_REG_SIZE / sizeof(u32)) @@ -69,21 +77,33 @@ static inline void mbox_write_reg(u32 val, size_t ofs) /* Mailbox H/W preparations */ static int omap2_mbox_startup(struct omap_mbox *mbox) { - unsigned int l; + u32 l; + unsigned long timeout; mbox_ick_handle = clk_get(NULL, "mailboxes_ick"); if (IS_ERR(mbox_ick_handle)) { - printk("Could not get mailboxes_ick\n"); + pr_err("Can't get mailboxes_ick\n"); return -ENODEV; } 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; + } + l = mbox_read_reg(MAILBOX_REVISION); pr_info("omap mailbox rev %d.%d\n", (l & 0xf0) >> 4, (l & 0x0f)); - /* set smart-idle & autoidle */ - l = mbox_read_reg(MAILBOX_SYSCONFIG); - l |= 0x00000011; + l = SMARTIDLE | AUTOIDLE; mbox_write_reg(l, MAILBOX_SYSCONFIG); omap2_mbox_enable_irq(mbox, IRQ_RX); |