CONFIG_SYS_CLK_FREQ is the standard way to set the system clock
frequency. On MPC83xx, CONFIG_83XX_CLKIN is used for this purpose.
Hence, the obvious way is to replace CONFIG_83XX_CLKIN with
CONFIG_SYS_CLK_FREQ.
A few MPC83xx boards use the CONFIG_83XX_CLKIN variable for computing
CONFIG_SYS_NS16550_CLK. This makes it harder to replace
CONFIG_83XX_CLKIN.
But the value of the multiplicator can be read from the SPMR register.
Hence, replace the static calculations with a call to a new get_bus_freq
function, as other architectures do.
Signed-off-by: Mario Six <mario....@gdsys.cc>
---
v2 -> v3:
No changes
v1 -> v2:
No changes
---
arch/powerpc/cpu/mpc83xx/spl_minimal.c | 8 ++++++++
include/configs/MPC8315ERDB.h | 2 +-
include/configs/ids8313.h | 2 +-
3 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/cpu/mpc83xx/spl_minimal.c
b/arch/powerpc/cpu/mpc83xx/spl_minimal.c
index 746f1febba0..3315ee05e11 100644
--- a/arch/powerpc/cpu/mpc83xx/spl_minimal.c
+++ b/arch/powerpc/cpu/mpc83xx/spl_minimal.c
@@ -89,3 +89,11 @@ void puts(const char *str)
while (*str)
putc(*str++);
}
+
+ulong get_bus_freq(ulong dummy)
+{
+ volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
+ u8 spmf = (im->clk.spmr & SPMR_SPMF) >> SPMR_SPMF_SHIFT;
+
+ return CONFIG_83XX_CLKIN * spmf;
+}
diff --git a/include/configs/MPC8315ERDB.h b/include/configs/MPC8315ERDB.h
index c373a0ab4c1..adb2bb6c2d8 100644
--- a/include/configs/MPC8315ERDB.h
+++ b/include/configs/MPC8315ERDB.h
@@ -271,7 +271,7 @@
*/
#define CONFIG_SYS_NS16550_SERIAL
#define CONFIG_SYS_NS16550_REG_SIZE 1
-#define CONFIG_SYS_NS16550_CLK (CONFIG_83XX_CLKIN * 2)
+#define CONFIG_SYS_NS16550_CLK (get_bus_freq(0))
#define CONFIG_SYS_BAUDRATE_TABLE \
{300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200}
diff --git a/include/configs/ids8313.h b/include/configs/ids8313.h
index caa3dd1f1a6..4b0ec273fb7 100644
--- a/include/configs/ids8313.h
+++ b/include/configs/ids8313.h
@@ -301,7 +301,7 @@
{300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 115200}
#define CONFIG_SYS_NS16550_COM1 (CONFIG_SYS_IMMR + 0x4500)
#define CONFIG_SYS_NS16550_COM2 (CONFIG_SYS_IMMR + 0x4600)
-#define CONFIG_SYS_NS16550_CLK (CONFIG_83XX_CLKIN * 2)
+#define CONFIG_SYS_NS16550_CLK (get_bus_freq(0))
#define CONFIG_HAS_FSL_DR_USB
#define CONFIG_SYS_SCCR_USBDRCM 3
--
2.20.1
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