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Diffstat (limited to 'platform/bcm28xx/uart.c')
| -rw-r--r-- | platform/bcm28xx/uart.c | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/platform/bcm28xx/uart.c b/platform/bcm28xx/uart.c deleted file mode 100644 index 7ef0effb..00000000 --- a/platform/bcm28xx/uart.c +++ /dev/null @@ -1,159 +0,0 @@ -/* - * Copyright (c) 2015 Travis Geiselbrecht - * - * Permission is hereby granted, free of charge, to any person obtaining - * a copy of this software and associated documentation files - * (the "Software"), to deal in the Software without restriction, - * including without limitation the rights to use, copy, modify, merge, - * publish, distribute, sublicense, and/or sell copies of the Software, - * and to permit persons to whom the Software is furnished to do so, - * subject to the following conditions: - * - * The above copyright notice and this permission notice shall be - * included in all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. - * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY - * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, - * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE - * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - */ -#include <reg.h> -#include <stdio.h> -#include <trace.h> -#include <lib/cbuf.h> -#include <kernel/thread.h> -#include <platform/interrupts.h> -#include <platform/debug.h> -#include <platform/bcm28xx.h> - -/* TODO: extract this into a generic PL011 driver */ - -/* PL011 implementation */ -#define UART_DR (0x00) -#define UART_RSR (0x04) -#define UART_TFR (0x18) -#define UART_ILPR (0x20) -#define UART_IBRD (0x24) -#define UART_FBRD (0x28) -#define UART_LCRH (0x2c) -#define UART_CR (0x30) -#define UART_IFLS (0x34) -#define UART_IMSC (0x38) -#define UART_TRIS (0x3c) -#define UART_TMIS (0x40) -#define UART_ICR (0x44) -#define UART_DMACR (0x48) - -#define UARTREG(base, reg) (*REG32((base) + (reg))) - -#define RXBUF_SIZE 16 -#define NUM_UART 1 - -static cbuf_t uart_rx_buf[NUM_UART]; - -static inline uintptr_t uart_to_ptr(unsigned int n) -{ - switch (n) { - default: - case 0: - return UART0_BASE; - } -} - -static enum handler_return uart_irq(void *arg) -{ - bool resched = false; - uint port = (uint)arg; - uintptr_t base = uart_to_ptr(port); - - /* read interrupt status and mask */ - uint32_t isr = UARTREG(base, UART_TMIS); - - if (isr & ((1<<6) | (1<<4))) { // rtmis, rxmis - UARTREG(base, UART_ICR) = (1<<4); - cbuf_t *rxbuf = &uart_rx_buf[port]; - - /* while fifo is not empty, read chars out of it */ - while ((UARTREG(base, UART_TFR) & (1<<4)) == 0) { - char c = UARTREG(base, UART_DR); - cbuf_write_char(rxbuf, c, false); - - resched = true; - } - } - - return resched ? INT_RESCHEDULE : INT_NO_RESCHEDULE; -} - -void uart_init(void) -{ - for (size_t i = 0; i < NUM_UART; i++) { - // create circular buffer to hold received data - cbuf_initialize(&uart_rx_buf[i], RXBUF_SIZE); - - // assumes interrupts are contiguous - register_int_handler(INTERRUPT_VC_UART + i, &uart_irq, (void *)i); - - // clear all irqs - UARTREG(uart_to_ptr(i), UART_ICR) = 0x3ff; - - // set fifo trigger level - UARTREG(uart_to_ptr(i), UART_IFLS) = 0; // 1/8 rxfifo, 1/8 txfifo - - // enable rx interrupt - UARTREG(uart_to_ptr(i), UART_IMSC) = (1<<6)|(1<<4); // rtim, rxim - - // enable receive - UARTREG(uart_to_ptr(i), UART_CR) |= (1<<9); // rxen - - // enable interrupt - unmask_interrupt(INTERRUPT_VC_UART + i); - } -} - -void uart_init_early(void) -{ - for (size_t i = 0; i < NUM_UART; i++) { - UARTREG(uart_to_ptr(i), UART_CR) = (1<<8)|(1<<0); // tx_enable, uarten - } -} - -int uart_putc(int port, char c) -{ - uintptr_t base = uart_to_ptr(port); - - /* spin while fifo is full */ - while (UARTREG(base, UART_TFR) & (1<<5)) - ; - UARTREG(base, UART_DR) = c; - - return 1; -} - -int uart_getc(int port, bool wait) -{ - cbuf_t *rxbuf = &uart_rx_buf[port]; - - char c; - if (cbuf_read_char(rxbuf, &c, wait) == 1) - return c; - - return -1; -} - -void uart_flush_tx(int port) -{ -} - -void uart_flush_rx(int port) -{ -} - -void uart_init_port(int port, uint baud) -{ -} - - |