mpc83xx: Replace CONFIG_83XX_CLKIN in calculations

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.six@gdsys.cc>

diff --git a/arch/powerpc/cpu/mpc83xx/spl_minimal.c b/arch/powerpc/cpu/mpc83xx/spl_minimal.c
index 746f1fe..3315ee0 100644 (file)
--- 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 c373a0a..adb2bb6 100644 (file)
--- 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 caa3dd1..4b0ec27 100644 (file)
--- 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