84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
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/*
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* sys-uart.c
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*
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* Copyright(c) 2007-2018 Jianjun Jiang <8192542@qq.com>
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* Official site: http://xboot.org
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* Mobile phone: +86-18665388956
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* QQ: 8192542
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <types.h>
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#include <stdint.h>
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#include <io.h>
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void sys_uart_init(void)
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{
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virtual_addr_t addr;
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uint32_t val;
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/* Config GPIOE1 and GPIOE0 to txd0 and rxd0 */
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addr = 0x01c20890 + 0x00;
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val = read32(addr);
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val &= ~(0xf << ((1 & 0x7) << 2));
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val |= ((0x5 & 0x7) << ((1 & 0x7) << 2));
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write32(addr, val);
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val = read32(addr);
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val &= ~(0xf << ((0 & 0x7) << 2));
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val |= ((0x5 & 0x7) << ((0 & 0x7) << 2));
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write32(addr, val);
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/* Open the clock gate for uart0 */
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addr = 0x01c20068;
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val = read32(addr);
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val |= 1 << 20;
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write32(addr, val);
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/* Deassert uart0 reset */
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addr = 0x01c202d0;
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val = read32(addr);
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val |= 1 << 20;
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write32(addr, val);
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/* Config uart0 to 115200-8-1-0 */
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addr = 0x01c25000;
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write32(addr + 0x04, 0x0);
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write32(addr + 0x08, 0xf7);
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write32(addr + 0x10, 0x0);
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val = read32(addr + 0x0c);
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val |= (1 << 7);
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write32(addr + 0x0c, val);
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write32(addr + 0x00, 0x36 & 0xff);
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write32(addr + 0x04, (0x36 >> 8) & 0xff);
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val = read32(addr + 0x0c);
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val &= ~(1 << 7);
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write32(addr + 0x0c, val);
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val = read32(addr + 0x0c);
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val &= ~0x1f;
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val |= (0x3 << 0) | (0 << 2) | (0x0 << 3);
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write32(addr + 0x0c, val);
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}
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void sys_uart_putc(char c)
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{
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virtual_addr_t addr = 0x01c25000;
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while((read32(addr + 0x7c) & (0x1 << 1)) == 0);
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write32(addr + 0x00, c);
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}
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