diff options
| -rw-r--r-- | drivers/serial/serial_lpuart.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/serial/serial_lpuart.c b/drivers/serial/serial_lpuart.c index da5f9a2..b0c6f6f 100644 --- a/drivers/serial/serial_lpuart.c +++ b/drivers/serial/serial_lpuart.c @@ -17,10 +17,34 @@ #define UC2_TE (1 << 3) #define UC2_RE (1 << 2) +#define STAT_LBKDIF (1 << 31) +#define STAT_RXEDGIF (1 << 30) +#define STAT_TDRE (1 << 23) +#define STAT_RDRF (1 << 21) +#define STAT_IDLE (1 << 20) +#define STAT_OR (1 << 19) +#define STAT_NF (1 << 18) +#define STAT_FE (1 << 17) +#define STAT_PF (1 << 16) +#define STAT_MA1F (1 << 15) +#define STAT_MA2F (1 << 14) +#define STAT_FLAGS (STAT_LBKDIF | STAT_RXEDGIF | STAT_IDLE | STAT_OR | \ + STAT_NF | STAT_FE | STAT_PF | STAT_MA1F | STAT_MA2F) + +#define CTRL_TE (1 << 19) +#define CTRL_RE (1 << 18) + +#define FIFO_TXFE 0x80 +#define FIFO_RXFE 0x40 + +#define WATER_TXWATER_OFF 1 +#define WATER_RXWATER_OFF 16 + DECLARE_GLOBAL_DATA_PTR; struct lpuart_fsl *base = (struct lpuart_fsl *)LPUART_BASE; +#ifndef CONFIG_LPUART_32B_REG static void lpuart_serial_setbrg(void) { u32 clk = mxc_get_clock(MXC_UART_CLK); @@ -107,13 +131,107 @@ static struct serial_device lpuart_serial_drv = { .getc = lpuart_serial_getc, .tstc = lpuart_serial_tstc, }; +#else +static void lpuart32_serial_setbrg(void) +{ + u32 clk = CONFIG_SYS_CLK_FREQ; + u32 sbr; + + if (!gd->baudrate) + gd->baudrate = CONFIG_BAUDRATE; + + sbr = (clk / (16 * gd->baudrate)); + /* place adjustment later - n/32 BRFA */ + + out_be32(&base->baud, sbr); +} + +static int lpuart32_serial_getc(void) +{ + u32 stat; + + while (((stat = in_be32(&base->stat)) & STAT_RDRF) == 0) { + out_be32(&base->stat, STAT_FLAGS); + WATCHDOG_RESET(); + } + + return in_be32(&base->data) & 0x3ff; +} + +static void lpuart32_serial_putc(const char c) +{ + if (c == '\n') + serial_putc('\r'); + + while (!(in_be32(&base->stat) & STAT_TDRE)) + WATCHDOG_RESET(); + + out_be32(&base->data, c); +} + +/* + * Test whether a character is in the RX buffer + */ +static int lpuart32_serial_tstc(void) +{ + if ((in_be32(&base->water) >> 24) == 0) + return 0; + + return 1; +} + +/* + * Initialise the serial port with the given baudrate. The settings + * are always 8 data bits, no parity, 1 stop bit, no start bits. + */ +static int lpuart32_serial_init(void) +{ + u8 ctrl; + + ctrl = in_be32(&base->ctrl); + ctrl &= ~CTRL_RE; + ctrl &= ~CTRL_TE; + out_be32(&base->ctrl, ctrl); + + out_be32(&base->modir, 0); + out_be32(&base->fifo, ~(FIFO_TXFE | FIFO_RXFE)); + + out_be32(&base->match, 0); + /* provide data bits, parity, stop bit, etc */ + + serial_setbrg(); + + out_be32(&base->ctrl, CTRL_RE | CTRL_TE); + + return 0; +} + +static struct serial_device lpuart32_serial_drv = { + .name = "lpuart32_serial", + .start = lpuart32_serial_init, + .stop = NULL, + .setbrg = lpuart32_serial_setbrg, + .putc = lpuart32_serial_putc, + .puts = default_serial_puts, + .getc = lpuart32_serial_getc, + .tstc = lpuart32_serial_tstc, +}; +#endif void lpuart_serial_initialize(void) { +#ifdef CONFIG_LPUART_32B_REG + serial_register(&lpuart32_serial_drv); +#else serial_register(&lpuart_serial_drv); +#endif } __weak struct serial_device *default_serial_console(void) { +#ifdef CONFIG_LPUART_32B_REG + return &lpuart32_serial_drv; +#else return &lpuart_serial_drv; +#endif } |