diff options
| -rw-r--r-- | CHANGELOG | 7 | ||||
| -rw-r--r-- | cpu/mips/au1x00_serial.c | 16 |
2 files changed, 20 insertions, 3 deletions
@@ -2,8 +2,13 @@ Changes for U-Boot 1.1.4: ====================================================================== +* Fix au1x00_serial baud rate calculation: + remove hardcoded cpu clock divisor and use register instead; + round up instead of truncate + Patch by Andrew Dyer, 15 Feb 2005 + * Add Xilinx Spartan3 family FPGA support - Patch by Kurt Stremerch, 14 February 2005 + Patch by Kurt Stremerch, 14 Feb 2005 * Fix drivers/cfi_flash.c: use info->reset_cmd instead of FLASH_CMD_RESET Patch by Zachary Landau, 11 Feb 2005 diff --git a/cpu/mips/au1x00_serial.c b/cpu/mips/au1x00_serial.c index ac75da591..42c668ee3 100644 --- a/cpu/mips/au1x00_serial.c +++ b/cpu/mips/au1x00_serial.c @@ -70,9 +70,21 @@ void serial_setbrg (void) { volatile u32 *uart_clk = (volatile u32*)(UART0_ADDR+UART_CLK); volatile u32 *uart_lcr = (volatile u32*)(UART0_ADDR+UART_LCR); + volatile u32 *sys_powerctrl = (u32 *)SYS_POWERCTRL; + int sd; + int divisorx2; - /* Set baudrate - FIXME for bus speeds != CPU/2 */ - *uart_clk = ((CFG_HZ/(CONFIG_BAUDRATE * 64))); + /* sd is system clock divisor */ + /* see section 10.4.5 in au1550 datasheet */ + sd = (*sys_powerctrl & 0x03) + 2; + + /* calulate 2x baudrate and round */ + divisorx2 = ((CFG_HZ/(sd * 16 * CONFIG_BAUDRATE))); + + if (divisorx2 & 0x01) + divisorx2 = divisorx2 + 1; + + *uart_clk = divisorx2 / 2; /* Set parity, stop bits and word length to 8N1 */ *uart_lcr = UART_LCR_WLEN8; |