Index: kernel/genarch/src/drivers/am335x/uart.c =================================================================== --- kernel/genarch/src/drivers/am335x/uart.c (revision 7ca8422bb3ba2a8a3166d572b8c1ee3d646fb83b) +++ (revision ) @@ -1,183 +1,0 @@ -/* - * Copyright (c) 2012 Jan Vesely - * Copyright (c) 2013 Maurizio Lombardi - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * - Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ -/** @addtogroup genarch - * @{ - */ -/** - * @file - * @brief Texas Instruments AM335x on-chip uart serial line driver. - */ - -#include -#include -#include -#include - -static void am335x_uart_txb(am335x_uart_t *uart, uint8_t b) -{ - /* Wait for buffer */ - while (uart->regs->ssr & AM335x_UART_SSR_TX_FIFO_FULL_FLAG); - /* Write to the outgoing fifo */ - uart->regs->thr = b; -} - -static void am335x_uart_putchar(outdev_t *dev, wchar_t ch) -{ - am335x_uart_t *uart = dev->data; - if (!ascii_check(ch)) { - am335x_uart_txb(uart, U_SPECIAL); - } else { - if (ch == '\n') - am335x_uart_txb(uart, '\r'); - am335x_uart_txb(uart, ch); - } -} - -static outdev_operations_t am335x_uart_ops = { - .redraw = NULL, - .write = am335x_uart_putchar, -}; - -static irq_ownership_t am335x_uart_claim(irq_t *irq) -{ - return IRQ_ACCEPT; -} - -static void am335x_uart_handler(irq_t *irq) -{ - am335x_uart_t *uart = irq->instance; - while ((uart->regs->rx_fifo_lvl)) { - const uint8_t val = uart->regs->rhr; - if (uart->indev && val) { - indev_push_character(uart->indev, val); - } - } -} - -bool am335x_uart_init( - am335x_uart_t *uart, inr_t interrupt, uintptr_t addr, size_t size) -{ - ASSERT(uart); - uart->regs = (void *)km_map(addr, size, PAGE_NOT_CACHEABLE); - - ASSERT(uart->regs); - - /* Soft reset the port */ - uart->regs->sysc = AM335x_UART_SYSC_SOFTRESET_FLAG; - while (!(uart->regs->syss & AM335x_UART_SYSS_RESETDONE_FLAG)); - - /* Disable the UART module */ - uart->regs->mdr1 |= AM335x_UART_MDR_MS_DISABLE; - - /* Enable access to EFR register */ - uart->regs->lcr = 0xbf; /* Sets config mode B */ - - /* Enable access to TCL_TLR register */ - const bool enhanced = uart->regs->efr & AM335x_UART_EFR_ENH_FLAG; - uart->regs->efr |= AM335x_UART_EFR_ENH_FLAG; /* Turn on enh. */ - uart->regs->lcr = 0x80; /* Config mode A */ - - /* Set default (val 0) triggers, disable DMA enable FIFOs */ - const bool tcl_tlr = uart->regs->mcr & AM335x_UART_MCR_TCR_TLR_FLAG; - /* Enable access to tcr and tlr registers */ - uart->regs->mcr |= AM335x_UART_MCR_TCR_TLR_FLAG; - - /* Enable FIFOs */ - uart->regs->fcr = AM335x_UART_FCR_FIFO_EN_FLAG; - - /* Enable fine granularity for RX FIFO and set trigger level to 1, - * TX FIFO, trigger level is irrelevant*/ - uart->regs->lcr = 0xBF; /* Sets config mode B */ - uart->regs->scr = AM335x_UART_SCR_RX_TRIG_GRANU1_FLAG; - uart->regs->tlr = 1 << AM335x_UART_TLR_RX_FIFO_TRIG_SHIFT; - - /* Sets config mode A */ - uart->regs->lcr = 0x80; - /* Restore tcl_tlr access flag */ - if (!tcl_tlr) - uart->regs->mcr &= ~AM335x_UART_MCR_TCR_TLR_FLAG; - /* Sets config mode B */ - uart->regs->lcr = 0xBF; - - /* Set the divisor value to get a baud rate of 115200 bps */ - uart->regs->dll = 0x1A; - uart->regs->dlh = 0x00; - - /* Restore enhanced */ - if (!enhanced) - uart->regs->efr &= ~AM335x_UART_EFR_ENH_FLAG; - - /* Set the DIV_EN bit to 0 */ - uart->regs->lcr &= ~AM335x_UART_LCR_DIV_EN_FLAG; - /* Set the BREAK_EN bit to 0 */ - uart->regs->lcr &= ~AM335x_UART_LCR_BREAK_EN_FLAG; - /* No parity */ - uart->regs->lcr &= ~AM335x_UART_LCR_PARITY_EN_FLAG; - /* Stop = 1 bit */ - uart->regs->lcr &= ~AM335x_UART_LCR_NB_STOP_FLAG; - /* Char length = 8 bits */ - uart->regs->lcr |= AM335x_UART_LCR_CHAR_LENGTH_8BITS; - - /* Enable the UART module */ - uart->regs->mdr1 &= (AM335x_UART_MDR_MS_UART16 & - ~AM335x_UART_MDR_MS_MASK); - - /* Disable interrupts */ - uart->regs->ier = 0; - - /* Setup outdev */ - outdev_initialize("am335x_uart_dev", &uart->outdev, &am335x_uart_ops); - uart->outdev.data = uart; - - /* Initialize IRQ */ - irq_initialize(&uart->irq); - uart->irq.devno = device_assign_devno(); - uart->irq.inr = interrupt; - uart->irq.claim = am335x_uart_claim; - uart->irq.handler = am335x_uart_handler; - uart->irq.instance = uart; - - return true; -} - -void am335x_uart_input_wire(am335x_uart_t *uart, indev_t *indev) -{ - ASSERT(uart); - /* Set indev */ - uart->indev = indev; - /* Register interrupt. */ - irq_register(&uart->irq); - /* Enable interrupt on receive */ - uart->regs->ier |= AM335x_UART_IER_RHR_IRQ_FLAG; -} - -/** - * @} - */ -