From af1a266670d040d2f4083ff309d732d648afba2a Mon Sep 17 00:00:00 2001 From: Angelos Mouzakitis Date: Tue, 10 Oct 2023 14:33:42 +0000 Subject: Add submodule dependency files Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec --- .../arch/i386/cpu/sc520/sc520_ssi.c | 95 ++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 roms/u-boot-sam460ex/arch/i386/cpu/sc520/sc520_ssi.c (limited to 'roms/u-boot-sam460ex/arch/i386/cpu/sc520/sc520_ssi.c') diff --git a/roms/u-boot-sam460ex/arch/i386/cpu/sc520/sc520_ssi.c b/roms/u-boot-sam460ex/arch/i386/cpu/sc520/sc520_ssi.c new file mode 100644 index 000000000..6e5e34630 --- /dev/null +++ b/roms/u-boot-sam460ex/arch/i386/cpu/sc520/sc520_ssi.c @@ -0,0 +1,95 @@ +/* + * (C) Copyright 2002 + * Daniel Engström, Omicron Ceti AB . + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +/* stuff specific for the sc520, but independent of implementation */ + +#include +#include +#include +#include + +int ssi_set_interface(int freq, int lsb_first, int inv_clock, int inv_phase) +{ + u8 temp=0; + + if (freq >= 8192) { + temp |= CTL_CLK_SEL_4; + } else if (freq >= 4096) { + temp |= CTL_CLK_SEL_8; + } else if (freq >= 2048) { + temp |= CTL_CLK_SEL_16; + } else if (freq >= 1024) { + temp |= CTL_CLK_SEL_32; + } else if (freq >= 512) { + temp |= CTL_CLK_SEL_64; + } else if (freq >= 256) { + temp |= CTL_CLK_SEL_128; + } else if (freq >= 128) { + temp |= CTL_CLK_SEL_256; + } else { + temp |= CTL_CLK_SEL_512; + } + + if (!lsb_first) { + temp |= MSBF_ENB; + } + + if (inv_clock) { + temp |= CLK_INV_ENB; + } + + if (inv_phase) { + temp |= PHS_INV_ENB; + } + + writeb(temp, &sc520_mmcr->ssictl); + + return 0; +} + +u8 ssi_txrx_byte(u8 data) +{ + writeb(data, &sc520_mmcr->ssixmit); + while (readb(&sc520_mmcr->ssista) & SSISTA_BSY); + writeb(SSICMD_CMD_SEL_XMITRCV, &sc520_mmcr->ssicmd); + while (readb(&sc520_mmcr->ssista) & SSISTA_BSY); + + return readb(&sc520_mmcr->ssircv); +} + + +void ssi_tx_byte(u8 data) +{ + writeb(data, &sc520_mmcr->ssixmit); + while (readb(&sc520_mmcr->ssista) & SSISTA_BSY); + writeb(SSICMD_CMD_SEL_XMIT, &sc520_mmcr->ssicmd); +} + +u8 ssi_rx_byte(void) +{ + while (readb(&sc520_mmcr->ssista) & SSISTA_BSY); + writeb(SSICMD_CMD_SEL_RCV, &sc520_mmcr->ssicmd); + while (readb(&sc520_mmcr->ssista) & SSISTA_BSY); + + return readb(&sc520_mmcr->ssircv); +} -- cgit 1.2.3-korg