cpm2: Rework baud rate generators configuration to support external clocks.
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>
diff --git a/arch/powerpc/sysdev/cpm2.c b/arch/powerpc/sysdev/cpm2.c
index 9311778..f1c3395 100644
--- a/arch/powerpc/sysdev/cpm2.c
+++ b/arch/powerpc/sysdev/cpm2.c
@@ -115,16 +115,10 @@
* 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 @@
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)
{