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cpm2: Rework baud rate generators configuration to support external clocks.

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The CPM2 BRG setup functions cpm_setbrg and cpm2_fastbrg don't support
external clocks. This patch adds a new exported __cpm2_setbrg function
that takes the clock rate and clock source as extra parameters, and moves
cpm_setbrg and cpm2_fastbrg to include/asm-powerpc/cpm2.h where they
become inline wrappers around __cpm2_setbrg.

Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Laurent Pinchart
2008-07-22 18:00:43 +02:00
committed by Kumar Gala
parent e517881e42
commit dddb8d3111
2 changed files with 37 additions and 43 deletions
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34
arch/powerpc/sysdev/cpm2.c
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@ -115,16 +115,10 @@ EXPORT_SYMBOL(cpm_command);
* Baud rate clocks are zero-based in the driver code (as that maps
* to port numbers). Documentation uses 1-based numbering.
*/
#define BRG_INT_CLK (get_brgfreq())
#define BRG_UART_CLK (BRG_INT_CLK/16)
/* This function is used by UARTS, or anything else that uses a 16x
* oversampled clock.
*/
void
cpm_setbrg(uint brg, uint rate)
void __cpm2_setbrg(uint brg, uint rate, uint clk, int div16, int src)
{
u32 __iomem *bp;
u32 val;
/* This is good enough to get SMCs running.....
*/
@ -135,34 +129,14 @@ cpm_setbrg(uint brg, uint rate)
brg -= 4;
}
bp += brg;
out_be32(bp, (((BRG_UART_CLK / rate) - 1) << 1) | CPM_BRG_EN);
cpm2_unmap(bp);
}
/* This function is used to set high speed synchronous baud rate
* clocks.
*/
void
cpm2_fastbrg(uint brg, uint rate, int div16)
{
u32 __iomem *bp;
u32 val;
if (brg < 4) {
bp = cpm2_map_size(im_brgc1, 16);
} else {
bp = cpm2_map_size(im_brgc5, 16);
brg -= 4;
}
bp += brg;
val = ((BRG_INT_CLK / rate) << 1) | CPM_BRG_EN;
val = (((clk / rate) - 1) << 1) | CPM_BRG_EN | src;
if (div16)
val |= CPM_BRG_DIV16;
out_be32(bp, val);
cpm2_unmap(bp);
}
EXPORT_SYMBOL(__cpm2_setbrg);
int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
{