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- /*
- * Copyright 2013 Freescale Semiconductor, Inc.
- *
- * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
- #include <common.h>
- #include <watchdog.h>
- #include <asm/io.h>
- #include <serial.h>
- #include <linux/compiler.h>
- #include <asm/arch/imx-regs.h>
- #include <asm/arch/clock.h>
- #define US1_TDRE (1 << 7)
- #define US1_RDRF (1 << 5)
- #define UC2_TE (1 << 3)
- #define UC2_RE (1 << 2)
- DECLARE_GLOBAL_DATA_PTR;
- struct lpuart_fsl *base = (struct lpuart_fsl *)LPUART_BASE;
- static void lpuart_serial_setbrg(void)
- {
- u32 clk = mxc_get_clock(MXC_UART_CLK);
- u16 sbr;
- if (!gd->baudrate)
- gd->baudrate = CONFIG_BAUDRATE;
- sbr = (u16)(clk / (16 * gd->baudrate));
- /* place adjustment later - n/32 BRFA */
- __raw_writeb(sbr >> 8, &base->ubdh);
- __raw_writeb(sbr & 0xff, &base->ubdl);
- }
- static int lpuart_serial_getc(void)
- {
- u8 status;
- while (!(__raw_readb(&base->us1) & US1_RDRF))
- WATCHDOG_RESET();
- status = __raw_readb(&base->us1);
- status |= US1_RDRF;
- __raw_writeb(status, &base->us1);
- return __raw_readb(&base->ud);
- }
- static void lpuart_serial_putc(const char c)
- {
- if (c == '\n')
- serial_putc('\r');
- while (!(__raw_readb(&base->us1) & US1_TDRE))
- WATCHDOG_RESET();
- __raw_writeb(c, &base->ud);
- }
- /*
- * Test whether a character is in the RX buffer
- */
- static int lpuart_serial_tstc(void)
- {
- if (__raw_readb(&base->urcfifo) == 0)
- return 0;
- return 1;
- }
- /*
- * Initialise the serial port with the given baudrate. The settings
- * are always 8 data bits, no parity, 1 stop bit, no start bits.
- */
- static int lpuart_serial_init(void)
- {
- u8 ctrl;
- ctrl = __raw_readb(&base->uc2);
- ctrl &= ~UC2_RE;
- ctrl &= ~UC2_TE;
- __raw_writeb(ctrl, &base->uc2);
- __raw_writeb(0, &base->umodem);
- __raw_writeb(0, &base->uc1);
- /* provide data bits, parity, stop bit, etc */
- serial_setbrg();
- __raw_writeb(UC2_RE | UC2_TE, &base->uc2);
- return 0;
- }
- static struct serial_device lpuart_serial_drv = {
- .name = "lpuart_serial",
- .start = lpuart_serial_init,
- .stop = NULL,
- .setbrg = lpuart_serial_setbrg,
- .putc = lpuart_serial_putc,
- .puts = default_serial_puts,
- .getc = lpuart_serial_getc,
- .tstc = lpuart_serial_tstc,
- };
- void lpuart_serial_initialize(void)
- {
- serial_register(&lpuart_serial_drv);
- }
- __weak struct serial_device *default_serial_console(void)
- {
- return &lpuart_serial_drv;
- }
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