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.
120 lines
3.3 KiB
C
120 lines
3.3 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 the LPC serial UART used by POWER9 boxes. This is modelled
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* in the qemu POWER9 machine.
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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 PROC_FREQ 50000000
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#define UART_FREQ 115200
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#define UART_BASE 0xc0002000
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#define LPC_UART_BASE 0x60300d00103f8
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/* Taken from skiboot */
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#define REG_RBR 0
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#define REG_THR 0
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#define REG_DLL 0
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#define REG_IER 1
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#define REG_DLM 1
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#define REG_FCR 2
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#define REG_IIR 2
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#define REG_LCR 3
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#define REG_MCR 4
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#define REG_LSR 5
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#define REG_MSR 6
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#define REG_SCR 7
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#define LSR_DR 0x01 /* Data ready */
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#define LSR_OE 0x02 /* Overrun */
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#define LSR_PE 0x04 /* Parity error */
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#define LSR_FE 0x08 /* Framing error */
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#define LSR_BI 0x10 /* Break */
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#define LSR_THRE 0x20 /* Xmit holding register empty */
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#define LSR_TEMT 0x40 /* Xmitter empty */
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#define LSR_ERR 0x80 /* Error */
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#define LCR_DLAB 0x80 /* DLL access */
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#define IER_RX 0x01
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#define IER_THRE 0x02
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#define IER_ALL 0x0f
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static uint64_t lpc_uart_base;
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static void lpc_uart_reg_write(uint64_t offset, uint8_t val) {
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uint64_t addr;
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addr = lpc_uart_base + offset;
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*(volatile uint8_t *)addr = val;
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}
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static uint8_t lpc_uart_reg_read(uint64_t offset) {
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uint64_t addr;
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uint8_t val;
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addr = lpc_uart_base + offset;
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val = *(volatile uint8_t *)addr;
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return val;
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}
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static int lpc_uart_tx_full(void) {
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return !(lpc_uart_reg_read(REG_LSR) & LSR_THRE);
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}
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static int lpc_uart_rx_empty(void) {
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return !(lpc_uart_reg_read(REG_LSR) & LSR_DR);
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}
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void uart_init_ppc(void) {
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lpc_uart_base = LPC_UART_BASE;
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}
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int mp_hal_stdin_rx_chr(void) {
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while (lpc_uart_rx_empty()) {
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;
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}
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return lpc_uart_reg_read(REG_THR);
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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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while (lpc_uart_tx_full()) {
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;
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}
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lpc_uart_reg_write(REG_RBR, str[i]);
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}
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}
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