3 * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
5 * See file CREDITS for list of people who contributed to this
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.
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.
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,
24 /* stuff specific for the sc520, but independent of implementation */
27 #include <asm/ic/ssi.h>
28 #include <asm/ic/sc520.h>
30 int ssi_set_interface(int freq, int lsb_first, int inv_clock, int inv_phase)
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;
49 temp |= CTL_CLK_SEL_512;
64 write_mmcr_byte(SC520_SSICTL, temp);
69 u8 ssi_txrx_byte(u8 data)
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);
79 void ssi_tx_byte(u8 data)
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);
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);