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authorLaurent Pinchart <laurentp@cse-semaphore.com>2008-07-22 18:00:43 +0200
committerKumar Gala <galak@kernel.crashing.org>2008-07-28 08:47:45 -0500
commitdddb8d311157d054da5441385f681b8cc0e5a94b (patch)
treee4a21e86291c011382f68fc063792c560d995f37
parente517881e427757afc3cce6d76173b1d898b30ab3 (diff)
downloadlwn-dddb8d311157d054da5441385f681b8cc0e5a94b.tar.gz
lwn-dddb8d311157d054da5441385f681b8cc0e5a94b.zip
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>
-rw-r--r--arch/powerpc/sysdev/cpm2.c34
-rw-r--r--include/asm-powerpc/cpm2.h46
2 files changed, 37 insertions, 43 deletions
diff --git a/arch/powerpc/sysdev/cpm2.c b/arch/powerpc/sysdev/cpm2.c
index 9311778a5082..f1c3395633b9 100644
--- a/arch/powerpc/sysdev/cpm2.c
+++ b/arch/powerpc/sysdev/cpm2.c
@@ -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)
{
diff --git a/include/asm-powerpc/cpm2.h b/include/asm-powerpc/cpm2.h
index 2c7fd9cee291..2a6fa0183ac9 100644
--- a/include/asm-powerpc/cpm2.h
+++ b/include/asm-powerpc/cpm2.h
@@ -12,6 +12,7 @@
#include <asm/immap_cpm2.h>
#include <asm/cpm.h>
+#include <sysdev/fsl_soc.h>
#ifdef CONFIG_PPC_85xx
#define CPM_MAP_ADDR (get_immrbase() + 0x80000)
@@ -93,10 +94,40 @@ extern cpm_cpm2_t __iomem *cpmp; /* Pointer to comm processor */
#define cpm_dpfree cpm_muram_free
#define cpm_dpram_addr cpm_muram_addr
-extern void cpm_setbrg(uint brg, uint rate);
-extern void cpm2_fastbrg(uint brg, uint rate, int div16);
extern void cpm2_reset(void);
+/* Baud rate generators.
+*/
+#define CPM_BRG_RST ((uint)0x00020000)
+#define CPM_BRG_EN ((uint)0x00010000)
+#define CPM_BRG_EXTC_INT ((uint)0x00000000)
+#define CPM_BRG_EXTC_CLK3_9 ((uint)0x00004000)
+#define CPM_BRG_EXTC_CLK5_15 ((uint)0x00008000)
+#define CPM_BRG_ATB ((uint)0x00002000)
+#define CPM_BRG_CD_MASK ((uint)0x00001ffe)
+#define CPM_BRG_DIV16 ((uint)0x00000001)
+
+#define CPM2_BRG_INT_CLK (get_brgfreq())
+#define CPM2_BRG_UART_CLK (CPM2_BRG_INT_CLK/16)
+
+extern void __cpm2_setbrg(uint brg, uint rate, uint clk, int div16, int src);
+
+/* This function is used by UARTS, or anything else that uses a 16x
+ * oversampled clock.
+ */
+static inline void cpm_setbrg(uint brg, uint rate)
+{
+ __cpm2_setbrg(brg, rate, CPM2_BRG_UART_CLK, 0, CPM_BRG_EXTC_INT);
+}
+
+/* This function is used to set high speed synchronous baud rate
+ * clocks.
+ */
+static inline void cpm2_fastbrg(uint brg, uint rate, int div16)
+{
+ __cpm2_setbrg(brg, rate, CPM2_BRG_INT_CLK, div16, CPM_BRG_EXTC_INT);
+}
+
/* Function code bits, usually generic to devices.
*/
#define CPMFCR_GBL ((u_char)0x20) /* Set memory snooping */
@@ -195,17 +226,6 @@ typedef struct smc_uart {
#define SMCM_TX ((unsigned char)0x02)
#define SMCM_RX ((unsigned char)0x01)
-/* Baud rate generators.
-*/
-#define CPM_BRG_RST ((uint)0x00020000)
-#define CPM_BRG_EN ((uint)0x00010000)
-#define CPM_BRG_EXTC_INT ((uint)0x00000000)
-#define CPM_BRG_EXTC_CLK3_9 ((uint)0x00004000)
-#define CPM_BRG_EXTC_CLK5_15 ((uint)0x00008000)
-#define CPM_BRG_ATB ((uint)0x00002000)
-#define CPM_BRG_CD_MASK ((uint)0x00001ffe)
-#define CPM_BRG_DIV16 ((uint)0x00000001)
-
/* SCCs.
*/
#define SCC_GSMRH_IRP ((uint)0x00040000)