diff options
Diffstat (limited to 'platform/zynq/uart.c')
| -rw-r--r-- | platform/zynq/uart.c | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/platform/zynq/uart.c b/platform/zynq/uart.c deleted file mode 100644 index 531c051e..00000000 --- a/platform/zynq/uart.c +++ /dev/null @@ -1,160 +0,0 @@ -/* - * Copyright (c) 2014 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 <assert.h> -#include <lib/cbuf.h> -#include <kernel/thread.h> -#include <platform/interrupts.h> -#include <platform/debug.h> -#include <platform/zynq.h> - -#define RXBUF_SIZE 16 - -static cbuf_t uart_rx_buf[NUM_UARTS]; - -static inline uintptr_t uart_to_ptr(unsigned int n) { return (n == 0) ? UART0_BASE : UART1_BASE; } -static inline uint uart_to_irq(unsigned int n) { return (n == 0) ? UART0_INT : UART1_INT; } - -#define UART_REG(base, reg) (*REG32((base) + (reg))) - -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 = UART_REG(base, UART_ISR); - isr &= UART_REG(base, UART_IMR); - - if (isr & (1<<0)) { // rxtrig - UART_REG(base, UART_ISR) = (1<< 0); - - while ((UART_REG(base, UART_SR) & (1<<1)) == 0) { // ~rempty - char c = UART_REG(base, UART_FIFO); - cbuf_write_char(&uart_rx_buf[port], c, false); - - resched = true; - } - } - - return resched ? INT_RESCHEDULE : INT_NO_RESCHEDULE; -} - -void uart_init(void) -{ - for (uint i = 0; i < NUM_UARTS; i++) { - cbuf_initialize(&uart_rx_buf[i], RXBUF_SIZE); - - uintptr_t base = uart_to_ptr(i); - - // clear all irqs - UART_REG(base, UART_IDR) = 0xffffffff; - - // set rx fifo trigger to 1 - UART_REG(base, UART_RXWM) = 1; - - // enable the receiver - // NOTE: must clear rxdis and set rxen in the same write - UART_REG(base, UART_CR) = (UART_REG(base, UART_CR) & ~(1<<3)) | (1 << 2); - - // enable rx interrupt - UART_REG(base, UART_IER) = (1<<0); // rxtrig - - // set up interrupt handler - register_int_handler(uart_to_irq(i), &uart_irq, (void *)i); - unmask_interrupt(uart_to_irq(i)); - } -} - -void uart_init_early(void) -{ - for (uint i = 0; i < NUM_UARTS; i++) { - uintptr_t base = uart_to_ptr(i); - - UART_REG(base, UART_BAUD_DIV) = UART_BRD_DIV(6); - UART_REG(base, UART_BAUDGEN) = UART_BRG_DIV(0x3E); - - // reset the tx/rx path - UART_REG(base, UART_CR) |= UART_CR_TXRES | UART_CR_RXRES; - while ((UART_REG(base, UART_CR) & (UART_CR_TXRES | UART_CR_RXRES)) != 0) - ; - - // n81, clock select ref_clk - UART_REG(base, UART_MR) = UART_MR_PAR(0x4); // no parity - - // no flow - UART_REG(base, UART_MODEMCR) = 0; - - UART_REG(base, UART_CR) = UART_CR_TXEN; - } - - /* Configuration for the serial console */ - /*UART_REG(UART1_BASE, UART_CR) = 0x00000017;*/ - /*UART_REG(UART1_BASE, UART_MR) = 0x00000020;*/ -} - -int uart_putc(int port, char c) -{ - DEBUG_ASSERT(port >= 0 && port < NUM_UARTS); - - uintptr_t base = uart_to_ptr(port); - - /* spin while fifo is full */ - while (UART_REG(base, UART_SR) & (1<<4)) - ; - UART_REG(base, UART_FIFO) = c; - - return 1; -} - -int uart_getc(int port, bool wait) -{ - DEBUG_ASSERT(port >= 0 && port < NUM_UARTS); - - char c; - if (cbuf_read_char(&uart_rx_buf[port], &c, wait) == 1) - return c; - - return -1; -} - -void uart_flush_tx(int port) -{ - DEBUG_ASSERT(port >= 0 && port < NUM_UARTS); -} - -void uart_flush_rx(int port) -{ - DEBUG_ASSERT(port >= 0 && port < NUM_UARTS); -} - -void uart_init_port(int port, uint baud) -{ - DEBUG_ASSERT(port >= 0 && port < NUM_UARTS); - - PANIC_UNIMPLEMENTED; -} - |