Factor out SC520 sub-features

Moved sub-features of the SC520 code which is currently selectively compiled
using #ifdef out of sc520.c into individual files selectively compiled via
the makefile

Signed-off-by: Graeme Russ <graeme.russ at gmail.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/cpu/i386/sc520/sc520_ssi.c b/cpu/i386/sc520/sc520_ssi.c
new file mode 100644
index 0000000..dd667ca
--- /dev/null
+++ b/cpu/i386/sc520/sc520_ssi.c
@@ -0,0 +1,92 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * 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 <common.h>
+#include <asm/ic/ssi.h>
+#include <asm/ic/sc520.h>
+
+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;
+	}
+
+	write_mmcr_byte(SC520_SSICTL, temp);
+
+	return 0;
+}
+
+u8 ssi_txrx_byte(u8 data)
+{
+	write_mmcr_byte(SC520_SSIXMIT, data);
+	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
+	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMITRCV);
+	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
+	return read_mmcr_byte(SC520_SSIRCV);
+}
+
+
+void ssi_tx_byte(u8 data)
+{
+	write_mmcr_byte(SC520_SSIXMIT, data);
+	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
+	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMIT);
+}
+
+u8 ssi_rx_byte(void)
+{
+	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
+	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_RCV);
+	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
+	return read_mmcr_byte(SC520_SSIRCV);
+}