diff options
Diffstat (limited to 'drivers/serial_pl011.c')
| -rw-r--r-- | drivers/serial_pl011.c | 174 |
1 files changed, 86 insertions, 88 deletions
diff --git a/drivers/serial_pl011.c b/drivers/serial_pl011.c index 60fcc9132a..0e132268c8 100644 --- a/drivers/serial_pl011.c +++ b/drivers/serial_pl011.c @@ -38,138 +38,136 @@ #define IO_READ(addr) (*(volatile unsigned int *)(addr)) /* - * IntegratorCP has two UARTs, use the first one, at 38400-8-N-1 + * IntegratorCP has two UARTs, use the first one, at 38400-8-N-1 * Versatile PB has four UARTs. */ #define NUM_PORTS 2 #define CONSOLE_PORT CONFIG_CONS_INDEX #define baudRate CONFIG_BAUDRATE -static volatile unsigned char * const port[NUM_PORTS] = {(void*)(CFG_SERIAL0), - (void*)(CFG_SERIAL1)}; +static volatile unsigned char *const port[NUM_PORTS] = { + (void *) (CFG_SERIAL0), + (void *) (CFG_SERIAL1) +}; -static void pl011_putc(int portnum, char c); -static int pl011_getc(int portnum); -static int pl011_tstc(int portnum); +static void pl011_putc (int portnum, char c); +static int pl011_getc (int portnum); +static int pl011_tstc (int portnum); int serial_init (void) { - unsigned int temp; - unsigned int divider; - unsigned int remainder; - unsigned int fraction; - - /* - ** First, disable everything. - */ - IO_WRITE(port[CONSOLE_PORT] + UART_PL011_CR, 0x0); - - /* - ** Set baud rate - ** - ** IBRD = UART_CLK / (16 * BAUD_RATE) - ** FBRD = ROUND((64 * MOD(UART_CLK,(16 * BAUD_RATE))) / (16 * BAUD_RATE)) - */ + unsigned int temp; + unsigned int divider; + unsigned int remainder; + unsigned int fraction; + + /* + ** First, disable everything. + */ + IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR, 0x0); + + /* + ** Set baud rate + ** + ** IBRD = UART_CLK / (16 * BAUD_RATE) + ** FBRD = ROUND((64 * MOD(UART_CLK,(16 * BAUD_RATE))) / (16 * BAUD_RATE)) + */ #ifdef CONFIG_VERSATILE - temp = 16 * baudRate; - divider = 24000000 / temp; - remainder = 24000000 % temp; - temp = (8 * remainder) / baudRate; - fraction = (temp >> 1) + (temp & 1); + temp = 16 * baudRate; + divider = 24000000 / temp; + remainder = 24000000 % temp; + temp = (8 * remainder) / baudRate; + fraction = (temp >> 1) + (temp & 1); #endif #ifdef CONFIG_INTEGRATOR - temp = 16 * baudRate; - divider = 14745600 / temp; - remainder = 14745600 % temp; - temp = (8 * remainder) / baudRate; - fraction = (temp >> 1) + (temp & 1); + temp = 16 * baudRate; + divider = 14745600 / temp; + remainder = 14745600 % temp; + temp = (8 * remainder) / baudRate; + fraction = (temp >> 1) + (temp & 1); #endif - - IO_WRITE(port[CONSOLE_PORT] + UART_PL011_IBRD, divider); - IO_WRITE(port[CONSOLE_PORT] + UART_PL011_FBRD, fraction); - - /* - ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled. - */ - IO_WRITE(port[CONSOLE_PORT] + UART_PL011_LCRH, - (UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN)); - - /* - ** Finally, enable the UART - */ - IO_WRITE(port[CONSOLE_PORT] + UART_PL011_CR, - (UART_PL011_CR_UARTEN | UART_PL011_CR_TXE | UART_PL011_CR_RXE)); - - return (0); + + IO_WRITE (port[CONSOLE_PORT] + UART_PL011_IBRD, divider); + IO_WRITE (port[CONSOLE_PORT] + UART_PL011_FBRD, fraction); + + /* + ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled. + */ + IO_WRITE (port[CONSOLE_PORT] + UART_PL011_LCRH, + (UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN)); + + /* + ** Finally, enable the UART + */ + IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR, + (UART_PL011_CR_UARTEN | UART_PL011_CR_TXE | + UART_PL011_CR_RXE)); + + return (0); } -void -serial_putc(const char c) +void serial_putc (const char c) { if (c == '\n') - pl011_putc(CONSOLE_PORT, '\r'); + pl011_putc (CONSOLE_PORT, '\r'); - pl011_putc(CONSOLE_PORT, c); + pl011_putc (CONSOLE_PORT, c); } -void -serial_puts (const char *s) +void serial_puts (const char *s) { while (*s) { serial_putc (*s++); } } -int -serial_getc(void) +int serial_getc (void) { - return pl011_getc(CONSOLE_PORT); + return pl011_getc (CONSOLE_PORT); } -int -serial_tstc(void) +int serial_tstc (void) { - return pl011_tstc(CONSOLE_PORT); + return pl011_tstc (CONSOLE_PORT); } -void -serial_setbrg (void) +void serial_setbrg (void) { } -static void pl011_putc(int portnum, char c) +static void pl011_putc (int portnum, char c) { - /* Wait until there is space in the FIFO */ - while (IO_READ(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_TXFF); - - /* Send the character */ - IO_WRITE(port[portnum] + UART_PL01x_DR, c); + /* Wait until there is space in the FIFO */ + while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_TXFF); + + /* Send the character */ + IO_WRITE (port[portnum] + UART_PL01x_DR, c); } -static int pl011_getc(int portnum) +static int pl011_getc (int portnum) { - unsigned int data; - - /* Wait until there is data in the FIFO */ - while (IO_READ(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE); - - data = IO_READ(port[portnum] + UART_PL01x_DR); - - /* Check for an error flag */ - if (data & 0xFFFFFF00) - { - /* Clear the error */ - IO_WRITE(port[portnum] + UART_PL01x_ECR, 0xFFFFFFFF); - return -1; - } - - return (int)data; + unsigned int data; + + /* Wait until there is data in the FIFO */ + while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE); + + data = IO_READ (port[portnum] + UART_PL01x_DR); + + /* Check for an error flag */ + if (data & 0xFFFFFF00) { + /* Clear the error */ + IO_WRITE (port[portnum] + UART_PL01x_ECR, 0xFFFFFFFF); + return -1; + } + + return (int) data; } -static int pl011_tstc(int portnum) +static int pl011_tstc (int portnum) { - return !(IO_READ(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE); + return !(IO_READ (port[portnum] + UART_PL01x_FR) & + UART_PL01x_FR_RXFE); } #endif |