/* * Copyright (C) 2011 Vladimir Zapolskiy <vz@mleia.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301, USA. */ #include <common.h> #include <asm/arch/cpu.h> #include <asm/arch/clk.h> #include <asm/arch/uart.h> #include <asm/io.h> #include <serial.h> #include <linux/compiler.h> DECLARE_GLOBAL_DATA_PTR; static struct hsuart_regs *hsuart = (struct hsuart_regs *)HS_UART_BASE; static void lpc32xx_serial_setbrg(void) { u32 div; /* UART rate = PERIPH_CLK / ((HSU_RATE + 1) x 14) */ div = (get_serial_clock() / 14 + gd->baudrate / 2) / gd->baudrate - 1; if (div > 255) div = 255; writel(div, &hsuart->rate); } static int lpc32xx_serial_getc(void) { while (!(readl(&hsuart->level) & HSUART_LEVEL_RX)) /* NOP */; return readl(&hsuart->rx) & HSUART_RX_DATA; } static void lpc32xx_serial_putc(const char c) { writel(c, &hsuart->tx); /* Wait for character to be sent */ while (readl(&hsuart->level) & HSUART_LEVEL_TX) /* NOP */; } static int lpc32xx_serial_tstc(void) { if (readl(&hsuart->level) & HSUART_LEVEL_RX) return 1; return 0; } static int lpc32xx_serial_init(void) { lpc32xx_serial_setbrg(); /* Disable hardware RTS and CTS flow control, set up RX and TX FIFO */ writel(HSUART_CTRL_TMO_16 | HSUART_CTRL_HSU_OFFSET(20) | HSUART_CTRL_HSU_RX_TRIG_32 | HSUART_CTRL_HSU_TX_TRIG_0, &hsuart->ctrl); return 0; } static void lpc32xx_serial_puts(const char *s) { while (*s) serial_putc(*s++); } static struct serial_device lpc32xx_serial_drv = { .name = "lpc32xx_serial", .start = lpc32xx_serial_init, .stop = NULL, .setbrg = lpc32xx_serial_setbrg, .putc = lpc32xx_serial_putc, .puts = lpc32xx_serial_puts, .getc = lpc32xx_serial_getc, .tstc = lpc32xx_serial_tstc, }; void lpc32xx_serial_initialize(void) { serial_register(&lpc32xx_serial_drv); } __weak struct serial_device *default_serial_console(void) { return &lpc32xx_serial_drv; }