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authorDaniel Hellstrom <daniel@gaisler.com>2010-01-22 11:49:04 +0100
committerFrancois Retief <fgretief@spaceteq.co.za>2015-12-03 13:15:48 +0200
commitff0b9b77c2c86e9c6cdb572a258b29f24fcd754a (patch)
treeb310ccb677f9146c5cfe1aca660a6e781938422b /arch/sparc
parent58e5585625d06530cf52ffc2b7b9a188dc46bffe (diff)
sparc: Serial baud rate register support multiple buses with different frequency
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/cpu/leon2/serial.c2
-rw-r--r--arch/sparc/cpu/leon3/serial.c17
-rw-r--r--arch/sparc/include/asm/global_data.h1
3 files changed, 16 insertions, 4 deletions
diff --git a/arch/sparc/cpu/leon2/serial.c b/arch/sparc/cpu/leon2/serial.c
index 603364ee0b..460abd1d9f 100644
--- a/arch/sparc/cpu/leon2/serial.c
+++ b/arch/sparc/cpu/leon2/serial.c
@@ -120,7 +120,7 @@ static void leon2_serial_setbrg(void)
if (!gd->baudrate)
gd->baudrate = CONFIG_BAUDRATE;
- scaler = leon2_serial_calc_scaler(CONFIG_SYS_CLK_FREQ, CONFIG_BAUDRATE);
+ scaler = leon2_serial_calc_scaler(CONFIG_SYS_CLK_FREQ, gd->baudrate);
writel(scaler, &uart->UART_Scaler);
}
diff --git a/arch/sparc/cpu/leon3/serial.c b/arch/sparc/cpu/leon3/serial.c
index 15d022673d..5348a78303 100644
--- a/arch/sparc/cpu/leon3/serial.c
+++ b/arch/sparc/cpu/leon3/serial.c
@@ -20,6 +20,11 @@ DECLARE_GLOBAL_DATA_PTR;
#define CONFIG_SYS_GRLIB_APBUART_INDEX 0
#endif
+static unsigned apbuart_calc_scaler(unsigned apbuart_freq, unsigned baud)
+{
+ return (((apbuart_freq * 10) / (baud * 8)) - 5) / 10;
+}
+
static int leon3_serial_init(void)
{
ambapp_dev_apbuart *uart;
@@ -37,8 +42,11 @@ static int leon3_serial_init(void)
/* found apbuart, let's init .. */
uart = (ambapp_dev_apbuart *) apbdev.address;
+ /* APBUART Frequency is equal to bus frequency */
+ gd->arch.uart_freq = ambapp_bus_freq(&ambapp_plb, apbdev.ahb_bus_index);
+
/* Set scaler / baud rate */
- tmp = (((CONFIG_SYS_CLK_FREQ*10) / (CONFIG_BAUDRATE*8)) - 5)/10;
+ tmp = apbuart_calc_scaler(gd->arch.uart_freq, CONFIG_BAUDRATE);
writel(tmp, &uart->scaler);
/* Let bit 11 be unchanged (debug bit for GRMON) */
@@ -123,7 +131,10 @@ static void leon3_serial_setbrg(void)
if (!gd->baudrate)
gd->baudrate = CONFIG_BAUDRATE;
- scaler = (((CONFIG_SYS_CLK_FREQ*10) / (gd->baudrate*8)) - 5)/10;
+ if (!gd->arch.uart_freq)
+ gd->arch.uart_freq = CONFIG_SYS_CLK_FREQ;
+
+ scaler = apbuart_calc_scaler(gd->arch.uart_freq, gd->baudrate);
writel(scaler, &uart->scaler);
}
@@ -156,7 +167,7 @@ __weak struct serial_device *default_serial_console(void)
static inline void _debug_uart_init(void)
{
ambapp_dev_apbuart *uart = (ambapp_dev_apbuart *)CONFIG_DEBUG_UART_BASE;
- uart->scaler = (((CONFIG_DEBUG_UART_CLOCK*10) / (CONFIG_BAUDRATE*8)) - 5)/10;
+ uart->scaler = apbuart_calc_scaler(CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE);
uart->ctrl = APBUART_CTRL_RE | APBUART_CTRL_TE;
}
diff --git a/arch/sparc/include/asm/global_data.h b/arch/sparc/include/asm/global_data.h
index 0680a56758..71820f095d 100644
--- a/arch/sparc/include/asm/global_data.h
+++ b/arch/sparc/include/asm/global_data.h
@@ -16,6 +16,7 @@
/* Architecture-specific global data */
struct arch_global_data {
void *uart;
+ unsigned int uart_freq;
};
#include <asm-generic/global_data.h>