From 362f9b6fa8c9670cc5496390845021c2865d049b Mon Sep 17 00:00:00 2001 From: Jochen Friedrich Date: Mon, 26 Nov 2007 18:03:40 +0100 Subject: [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 Acked-by: Scott Wood Acked-by: Arnd Bergmann Signed-off-by: Vitaly Bordug --- arch/powerpc/sysdev/cpm2_common.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'arch/powerpc/sysdev/cpm2_common.c') 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 -- cgit v1.2.3-70-g09d2