diff options
Diffstat (limited to 'bsps/arm/shared/serial/zynq-uart.c')
| -rw-r--r-- | bsps/arm/shared/serial/zynq-uart.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/bsps/arm/shared/serial/zynq-uart.c b/bsps/arm/shared/serial/zynq-uart.c index 92a8c86009..fc670441b8 100644 --- a/bsps/arm/shared/serial/zynq-uart.c +++ b/bsps/arm/shared/serial/zynq-uart.c @@ -31,117 +31,6 @@ #include <bspopts.h> -/* - * Make weak and let the user override. - */ -uint32_t zynq_uart_input_clock(void) __attribute__ ((weak)); - -uint32_t zynq_uart_input_clock(void) -{ - return ZYNQ_CLOCK_UART; -} - -static int zynq_cal_baud_rate(uint32_t baudrate, - uint32_t* brgr, - uint32_t* bauddiv, - uint32_t modereg) -{ - uint32_t brgr_value; /* Calculated value for baud rate generator */ - uint32_t calcbaudrate; /* Calculated baud rate */ - uint32_t bauderror; /* Diff between calculated and requested baud rate */ - uint32_t best_error = 0xFFFFFFFF; - uint32_t percenterror; - uint32_t bdiv; - uint32_t inputclk = zynq_uart_input_clock(); - - /* - * Make sure the baud rate is not impossilby large. - * Fastest possible baud rate is Input Clock / 2. - */ - if ((baudrate * 2) > inputclk) { - return -1; - } - /* - * Check whether the input clock is divided by 8 - */ - if(modereg & ZYNQ_UART_MODE_CLKS) { - inputclk = inputclk / 8; - } - - /* - * Determine the Baud divider. It can be 4to 254. - * Loop through all possible combinations - */ - for (bdiv = 4; bdiv < 255; bdiv++) { - - /* - * Calculate the value for BRGR register - */ - brgr_value = inputclk / (baudrate * (bdiv + 1)); - - /* - * Calculate the baud rate from the BRGR value - */ - calcbaudrate = inputclk/ (brgr_value * (bdiv + 1)); - - /* - * Avoid unsigned integer underflow - */ - if (baudrate > calcbaudrate) { - bauderror = baudrate - calcbaudrate; - } - else { - bauderror = calcbaudrate - baudrate; - } - - /* - * Find the calculated baud rate closest to requested baud rate. - */ - if (best_error > bauderror) { - *brgr = brgr_value; - *bauddiv = bdiv; - best_error = bauderror; - } - } - - /* - * Make sure the best error is not too large. - */ - percenterror = (best_error * 100) / baudrate; -#define XUARTPS_MAX_BAUD_ERROR_RATE 3 /* max % error allowed */ - if (XUARTPS_MAX_BAUD_ERROR_RATE < percenterror) { - return -1; - } - - return 0; -} - -void zynq_uart_initialize(rtems_termios_device_context *base) -{ - zynq_uart_context *ctx = (zynq_uart_context *) base; - volatile zynq_uart *regs = ctx->regs; - uint32_t brgr = 0x3e; - uint32_t bauddiv = 0x6; - - zynq_cal_baud_rate(ZYNQ_UART_DEFAULT_BAUD, &brgr, &bauddiv, regs->mode); - - regs->control &= ~(ZYNQ_UART_CONTROL_RXEN | ZYNQ_UART_CONTROL_TXEN); - regs->control = ZYNQ_UART_CONTROL_RXDIS - | ZYNQ_UART_CONTROL_TXDIS - | ZYNQ_UART_CONTROL_RXRES - | ZYNQ_UART_CONTROL_TXRES; - regs->mode = ZYNQ_UART_MODE_CHMODE(ZYNQ_UART_MODE_CHMODE_NORMAL) - | ZYNQ_UART_MODE_PAR(ZYNQ_UART_MODE_PAR_NONE) - | ZYNQ_UART_MODE_CHRL(ZYNQ_UART_MODE_CHRL_8); - regs->baud_rate_gen = ZYNQ_UART_BAUD_RATE_GEN_CD(brgr); - regs->baud_rate_div = ZYNQ_UART_BAUD_RATE_DIV_BDIV(bauddiv); - regs->rx_fifo_trg_lvl = ZYNQ_UART_RX_FIFO_TRG_LVL_RTRIG(0); - regs->rx_timeout = ZYNQ_UART_RX_TIMEOUT_RTO(0); - regs->control = ZYNQ_UART_CONTROL_RXEN - | ZYNQ_UART_CONTROL_TXEN - | ZYNQ_UART_CONTROL_RSTTO; -} - #ifdef ZYNQ_CONSOLE_USE_INTERRUPTS static void zynq_uart_interrupt(void *arg) { @@ -220,33 +109,6 @@ static void zynq_uart_last_close( } #endif -int zynq_uart_read_polled(rtems_termios_device_context *base) -{ - zynq_uart_context *ctx = (zynq_uart_context *) base; - volatile zynq_uart *regs = ctx->regs; - - if ((regs->channel_sts & ZYNQ_UART_CHANNEL_STS_REMPTY) != 0) { - return -1; - } else { - return ZYNQ_UART_TX_RX_FIFO_FIFO_GET(regs->tx_rx_fifo); - } -} - -void zynq_uart_write_polled( - rtems_termios_device_context *base, - char c -) -{ - zynq_uart_context *ctx = (zynq_uart_context *) base; - volatile zynq_uart *regs = ctx->regs; - - while ((regs->channel_sts & ZYNQ_UART_CHANNEL_STS_TFUL) != 0) { - /* Wait */ - } - - regs->tx_rx_fifo = ZYNQ_UART_TX_RX_FIFO_FIFO(c); -} - static void zynq_uart_write_support( rtems_termios_device_context *base, const char *buf, @@ -313,16 +175,3 @@ const rtems_termios_device_handler zynq_uart_handler = { .mode = TERMIOS_POLLED #endif }; - -void zynq_uart_reset_tx_flush(zynq_uart_context *ctx) -{ - volatile zynq_uart *regs = ctx->regs; - int c = 4; - - while (c-- > 0) - zynq_uart_write_polled(&ctx->base, '\r'); - - while ((regs->channel_sts & ZYNQ_UART_CHANNEL_STS_TEMPTY) == 0) { - /* Wait */ - } -} |