diff options
| author | Jochen Friedrich <jochen@scram.de> | 2007-11-26 18:03:40 +0100 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2007-12-13 22:47:16 -0600 |
| commit | 362f9b6fa8c9670cc5496390845021c2865d049b (patch) | |
| tree | ea6a97b113aa8382aeddbcfa4faf2524bd2d96dc /arch/powerpc/sysdev/cpm2_common.c | |
| parent | 721c0c8af1a27941a34af5046aae4a8369c8404c (diff) | |
[POWERPC] Move CPM command handling into the cpm drivers
This patch moves the CPM command handling into commproc.c
for CPM1 and cpm2_common.c. This is yet another preparation
to get rid of drivers accessing the CPM via the global cpmp.
Signed-off-by: Jochen Friedrich <jochen@scram.de>
Acked-by: Scott Wood <scottwood@freescale.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vitaly Bordug <vitb@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/sysdev/cpm2_common.c')
| -rw-r--r-- | arch/powerpc/sysdev/cpm2_common.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/cpm2_common.c b/arch/powerpc/sysdev/cpm2_common.c index 859362fecb7c..0a7054579d98 100644 --- a/arch/powerpc/sysdev/cpm2_common.c +++ b/arch/powerpc/sysdev/cpm2_common.c @@ -83,6 +83,31 @@ cpm2_reset(void) cpmp = &cpm2_immr->im_cpm; } +static DEFINE_SPINLOCK(cmd_lock); + +#define MAX_CR_CMD_LOOPS 10000 + +int cpm_command(u32 command, u8 opcode) +{ + int i, ret; + unsigned long flags; + + spin_lock_irqsave(&cmd_lock, flags); + + ret = 0; + out_be32(&cpmp->cp_cpcr, command | opcode | CPM_CR_FLG); + for (i = 0; i < MAX_CR_CMD_LOOPS; i++) + if ((in_be32(&cpmp->cp_cpcr) & CPM_CR_FLG) == 0) + goto out; + + printk(KERN_ERR "%s(): Not able to issue CPM command\n", __FUNCTION__); + ret = -EIO; +out: + spin_unlock_irqrestore(&cmd_lock, flags); + return ret; +} +EXPORT_SYMBOL(cpm_command); + /* Set a baud rate generator. This needs lots of work. There are * eight BRGs, which can be connected to the CPM channels or output * as clocks. The BRGs are in two different block of internal |