f03d030080
Microwatt may have firmware that places data in r3, which was used to detect microwatt vs powernv. This breaks the existing probing of the UART type in this powerpc port. Instead build only the appropriate UART into the firmware, selected by passing the option UART=potato or UART=lpc_serial to the Makefile. A future enhancement would be to parse the device tree and configure MicroPython based on the settings.
133 lines
3.7 KiB
C
133 lines
3.7 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019, Michael Neuling, IBM Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/*
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* This is a driver for the potato UART used by the microwatt core.
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* The original potato UART came from here
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* https://github.com/skordal/potato
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*/
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#include <unistd.h>
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#include <stdbool.h>
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#include "py/mpconfig.h"
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#define SYSCON_BASE 0xc0000000 /* System control regs */
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#define SYS_REG_CLKINFO 0x20
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#define UART_FREQ 115200
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#define POTATO_UART_BASE 0xc0002000
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static uint64_t potato_uart_base;
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#define POTATO_CONSOLE_TX 0x00
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#define POTATO_CONSOLE_RX 0x08
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#define POTATO_CONSOLE_STATUS 0x10
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#define POTATO_CONSOLE_STATUS_RX_EMPTY 0x01
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#define POTATO_CONSOLE_STATUS_TX_EMPTY 0x02
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#define POTATO_CONSOLE_STATUS_RX_FULL 0x04
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#define POTATO_CONSOLE_STATUS_TX_FULL 0x08
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#define POTATO_CONSOLE_CLOCK_DIV 0x18
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#define POTATO_CONSOLE_IRQ_EN 0x20
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static uint64_t potato_uart_reg_read(int offset) {
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uint64_t addr;
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uint64_t val;
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addr = potato_uart_base + offset;
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val = *(volatile uint64_t *)addr;
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return val;
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}
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static void potato_uart_reg_write(int offset, uint64_t val) {
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uint64_t addr;
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addr = potato_uart_base + offset;
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*(volatile uint64_t *)addr = val;
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}
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static int potato_uart_rx_empty(void) {
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uint64_t val;
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val = potato_uart_reg_read(POTATO_CONSOLE_STATUS);
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if (val & POTATO_CONSOLE_STATUS_RX_EMPTY) {
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return 1;
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}
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return 0;
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}
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static int potato_uart_tx_full(void) {
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uint64_t val;
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val = potato_uart_reg_read(POTATO_CONSOLE_STATUS);
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if (val & POTATO_CONSOLE_STATUS_TX_FULL) {
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return 1;
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}
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return 0;
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}
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static unsigned long potato_uart_divisor(unsigned long proc_freq, unsigned long uart_freq) {
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return proc_freq / (uart_freq * 16) - 1;
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}
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void uart_init_ppc(void) {
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uint64_t proc_freq;
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potato_uart_base = POTATO_UART_BASE;
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proc_freq = *(volatile uint64_t *)(SYSCON_BASE + SYS_REG_CLKINFO);
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potato_uart_reg_write(POTATO_CONSOLE_CLOCK_DIV, potato_uart_divisor(proc_freq, UART_FREQ));
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}
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int mp_hal_stdin_rx_chr(void) {
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uint64_t val;
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while (potato_uart_rx_empty()) {
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;
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}
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val = potato_uart_reg_read(POTATO_CONSOLE_RX);
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return (char)(val & 0x000000ff);
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}
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void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
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int i;
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for (i = 0; i < len; i++) {
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uint64_t val = str[i];
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while (potato_uart_tx_full()) {
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;
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}
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potato_uart_reg_write(POTATO_CONSOLE_TX, val);
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}
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}
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