77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/*
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* ssp-uart.c SPI via SSP
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* Copyright (C) 2011, Mark F. Brown <mark.f.brown@intel.com> Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include "ssp-uart.h"
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#include "bootstub.h"
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#define SSP_TIMEOUT 0xAFF
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#define SSP_SLAVE 0x02 /* Slave select */
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#define SSP_SSCR0 0x00C0008F
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#define SSP_SSCR1 0x10000000
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static int ssp_inited = 0;
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static volatile struct ssp_reg *pspi = 0;
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#define WRITE_DATA (2<<14)
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static void ssp_init()
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{
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pspi = (struct ssp_reg*)TNG_SSP5_ADDR_BASE;
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pspi->SSPx_SSFS = SSP_SLAVE;
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pspi->SSPx_SSCR1 = SSP_SSCR1;
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pspi->SSPx_SSCR0 = SSP_SSCR0;
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ssp_inited = 1;
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}
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static void ssp_max3110_putc(char c)
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{
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vu32 SSCR0 = 0;
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vu32 i;
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pspi = (struct ssp_reg*)TNG_SSP5_ADDR_BASE;
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SSCR0 = (WRITE_DATA | c);
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pspi->SSPx_SSDR = SSCR0;
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for (i = 0; i < SSP_TIMEOUT; i++)
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{
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SSCR0 = pspi->SSPx_SSSR;
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if ((SSCR0 & 0xF00) == 0) break;
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}
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SSCR0 = pspi->SSPx_SSDR;
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}
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void bs_ssp_printk(const char *str)
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{
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if (!str)
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return;
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if (!ssp_inited)
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{
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ssp_init();
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}
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while (*str) {
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if (*str == '\n')
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ssp_max3110_putc('\r');
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ssp_max3110_putc(*str++);
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}
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}
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