| Graeme Russ | 6d7f610 | 2009-02-24 21:14:32 +1100 | [diff] [blame^] | 1 | /* |
| 2 | * (C) Copyright 2002 |
| 3 | * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>. |
| 4 | * |
| 5 | * See file CREDITS for list of people who contributed to this |
| 6 | * project. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of |
| 11 | * the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 21 | * MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | /* stuff specific for the sc520, but independent of implementation */ |
| 25 | |
| 26 | #include <common.h> |
| 27 | #include <asm/ic/ssi.h> |
| 28 | #include <asm/ic/sc520.h> |
| 29 | |
| 30 | int ssi_set_interface(int freq, int lsb_first, int inv_clock, int inv_phase) |
| 31 | { |
| 32 | u8 temp=0; |
| 33 | |
| 34 | if (freq >= 8192) { |
| 35 | temp |= CTL_CLK_SEL_4; |
| 36 | } else if (freq >= 4096) { |
| 37 | temp |= CTL_CLK_SEL_8; |
| 38 | } else if (freq >= 2048) { |
| 39 | temp |= CTL_CLK_SEL_16; |
| 40 | } else if (freq >= 1024) { |
| 41 | temp |= CTL_CLK_SEL_32; |
| 42 | } else if (freq >= 512) { |
| 43 | temp |= CTL_CLK_SEL_64; |
| 44 | } else if (freq >= 256) { |
| 45 | temp |= CTL_CLK_SEL_128; |
| 46 | } else if (freq >= 128) { |
| 47 | temp |= CTL_CLK_SEL_256; |
| 48 | } else { |
| 49 | temp |= CTL_CLK_SEL_512; |
| 50 | } |
| 51 | |
| 52 | if (!lsb_first) { |
| 53 | temp |= MSBF_ENB; |
| 54 | } |
| 55 | |
| 56 | if (inv_clock) { |
| 57 | temp |= CLK_INV_ENB; |
| 58 | } |
| 59 | |
| 60 | if (inv_phase) { |
| 61 | temp |= PHS_INV_ENB; |
| 62 | } |
| 63 | |
| 64 | write_mmcr_byte(SC520_SSICTL, temp); |
| 65 | |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | u8 ssi_txrx_byte(u8 data) |
| 70 | { |
| 71 | write_mmcr_byte(SC520_SSIXMIT, data); |
| 72 | while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY); |
| 73 | write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMITRCV); |
| 74 | while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY); |
| 75 | return read_mmcr_byte(SC520_SSIRCV); |
| 76 | } |
| 77 | |
| 78 | |
| 79 | void ssi_tx_byte(u8 data) |
| 80 | { |
| 81 | write_mmcr_byte(SC520_SSIXMIT, data); |
| 82 | while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY); |
| 83 | write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMIT); |
| 84 | } |
| 85 | |
| 86 | u8 ssi_rx_byte(void) |
| 87 | { |
| 88 | while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY); |
| 89 | write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_RCV); |
| 90 | while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY); |
| 91 | return read_mmcr_byte(SC520_SSIRCV); |
| 92 | } |