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| author | Daniel Hellstrom <daniel@gaisler.com> | 2010-01-22 11:49:04 +0100 |
|---|---|---|
| committer | Francois Retief <fgretief@spaceteq.co.za> | 2015-12-03 13:15:48 +0200 |
| commit | ff0b9b77c2c86e9c6cdb572a258b29f24fcd754a (patch) | |
| tree | b310ccb677f9146c5cfe1aca660a6e781938422b /arch/sparc/cpu/leon3 | |
| parent | 58e5585625d06530cf52ffc2b7b9a188dc46bffe (diff) | |
| download | blackbird-obmc-uboot-ff0b9b77c2c86e9c6cdb572a258b29f24fcd754a.tar.gz blackbird-obmc-uboot-ff0b9b77c2c86e9c6cdb572a258b29f24fcd754a.zip | |
sparc: Serial baud rate register support multiple buses with different frequency
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Diffstat (limited to 'arch/sparc/cpu/leon3')
| -rw-r--r-- | arch/sparc/cpu/leon3/serial.c | 17 |
1 files changed, 14 insertions, 3 deletions
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; } |
