Mark F. Brown | 90847a8 | 2011-09-07 18:06:24 -0400 | [diff] [blame] | 1 | /* |
| 2 | * ssp-uart.c SPI via SSP |
| 3 | * Copyright (C) 2011, Mark F. Brown <mark.f.brown@intel.com> Intel Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include "ssp-uart.h" |
| 21 | #include "bootstub.h" |
| 22 | |
| 23 | #define SSP_TIMEOUT 0xAFF |
| 24 | #define SSP_SLAVE 0x02 /* Slave select */ |
| 25 | #define SSP_SSCR0 0x00C0008F |
| 26 | #define SSP_SSCR1 0x10000000 |
| 27 | |
| 28 | static int ssp_inited = 0; |
| 29 | static volatile struct ssp_reg *pspi = 0; |
| 30 | |
| 31 | #define WRITE_DATA (2<<14) |
| 32 | |
| 33 | static void ssp_init() |
| 34 | { |
| 35 | pspi = (struct ssp_reg*)TNG_SSP5_ADDR_BASE; |
| 36 | pspi->SSPx_SSFS = SSP_SLAVE; |
| 37 | pspi->SSPx_SSCR1 = SSP_SSCR1; |
| 38 | pspi->SSPx_SSCR0 = SSP_SSCR0; |
| 39 | |
| 40 | ssp_inited = 1; |
| 41 | } |
| 42 | |
| 43 | static void ssp_max3110_putc(char c) |
| 44 | { |
| 45 | vu32 SSCR0 = 0; |
| 46 | vu32 i; |
| 47 | |
| 48 | pspi = (struct ssp_reg*)TNG_SSP5_ADDR_BASE; |
| 49 | SSCR0 = (WRITE_DATA | c); |
| 50 | pspi->SSPx_SSDR = SSCR0; |
| 51 | |
| 52 | for (i = 0; i < SSP_TIMEOUT; i++) |
| 53 | { |
| 54 | SSCR0 = pspi->SSPx_SSSR; |
| 55 | if ((SSCR0 & 0xF00) == 0) break; |
| 56 | } |
| 57 | |
| 58 | SSCR0 = pspi->SSPx_SSDR; |
| 59 | } |
| 60 | |
| 61 | void bs_ssp_printk(const char *str) |
| 62 | { |
| 63 | if (!str) |
| 64 | return; |
| 65 | |
| 66 | if (!ssp_inited) |
| 67 | { |
| 68 | ssp_init(); |
| 69 | } |
| 70 | |
| 71 | while (*str) { |
| 72 | if (*str == '\n') |
| 73 | ssp_max3110_putc('\r'); |
| 74 | |
| 75 | ssp_max3110_putc(*str++); |
| 76 | } |
| 77 | } |