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https://github.com/smaeul/u-boot.git
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140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/* GRLIB APBUART Serial controller driver
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*
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* (C) Copyright 2007
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* Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <asm/processor.h>
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#include <asm/leon.h>
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#include <ambapp.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Force cache miss each time a serial controller reg is read */
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#define CACHE_BYPASS 1
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#ifdef CACHE_BYPASS
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#define READ_BYTE(var) SPARC_NOCACHE_READ_BYTE((unsigned int)&(var))
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#define READ_HWORD(var) SPARC_NOCACHE_READ_HWORD((unsigned int)&(var))
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#define READ_WORD(var) SPARC_NOCACHE_READ((unsigned int)&(var))
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#define READ_DWORD(var) SPARC_NOCACHE_READ_DWORD((unsigned int)&(var))
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#endif
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ambapp_dev_apbuart *leon3_apbuart = NULL;
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int serial_init(void)
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{
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ambapp_apbdev apbdev;
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unsigned int tmp;
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/* find UART */
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if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_APBUART, &apbdev) == 1) {
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leon3_apbuart = (ambapp_dev_apbuart *) apbdev.address;
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/* found apbuart, let's init...
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*
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* Set scaler / baud rate
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*
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* Receiver & transmitter enable
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*/
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leon3_apbuart->scaler = CONFIG_SYS_GRLIB_APBUART_SCALER;
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/* Let bit 11 be unchanged (debug bit for GRMON) */
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tmp = READ_WORD(leon3_apbuart->ctrl);
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leon3_apbuart->ctrl = ((tmp & LEON_REG_UART_CTRL_DBG) |
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LEON_REG_UART_CTRL_RE |
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LEON_REG_UART_CTRL_TE);
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return 0;
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}
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return -1; /* didn't find hardware */
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}
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void serial_putc(const char c)
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{
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if (c == '\n')
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serial_putc_raw('\r');
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serial_putc_raw(c);
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}
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void serial_putc_raw(const char c)
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{
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if (!leon3_apbuart)
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return;
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/* Wait for last character to go. */
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while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_THE)) ;
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/* Send data */
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leon3_apbuart->data = c;
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#ifdef LEON_DEBUG
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/* Wait for data to be sent */
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while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_TSE)) ;
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#endif
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}
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void serial_puts(const char *s)
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{
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while (*s) {
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serial_putc(*s++);
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}
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}
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int serial_getc(void)
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{
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if (!leon3_apbuart)
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return 0;
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/* Wait for a character to arrive. */
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while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_DR)) ;
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/* read data */
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return READ_WORD(leon3_apbuart->data);
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}
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int serial_tstc(void)
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{
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if (leon3_apbuart)
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return (READ_WORD(leon3_apbuart->status) &
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LEON_REG_UART_STATUS_DR);
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return 0;
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}
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/* set baud rate for uart */
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void serial_setbrg(void)
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{
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/* update baud rate settings, read it from gd->baudrate */
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unsigned int scaler;
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if (leon3_apbuart && (gd->baudrate > 0)) {
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scaler =
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(((CONFIG_SYS_CLK_FREQ * 10) / (gd->baudrate * 8)) -
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5) / 10;
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leon3_apbuart->scaler = scaler;
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}
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return;
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}
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