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-rw-r--r--board/emk/top9000/spi.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/board/emk/top9000/spi.c b/board/emk/top9000/spi.c
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+++ b/board/emk/top9000/spi.c
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+/*
+ * Copyright (C) 2010
+ * Reinhard Meyer, EMK Elektronik, reinhard.meyer@emk-elektronik.de
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/at91_spi.h>
+#include <asm/arch/gpio.h>
+#include <spi.h>
+
+static const struct {
+ u32 port;
+ u32 bit;
+} cs_to_portbit[2][4] = {
+ {{AT91_PIO_PORTA, 3}, {AT91_PIO_PORTC, 11},
+ {AT91_PIO_PORTC, 16}, {AT91_PIO_PORTC, 17} },
+ {{AT91_PIO_PORTB, 3}, {AT91_PIO_PORTC, 5},
+ {AT91_PIO_PORTC, 4}, {AT91_PIO_PORTC, 3} }
+};
+
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+ debug("spi_cs_is_valid: bus=%u cs=%u\n", bus, cs);
+ if (bus < 2 && cs < 4)
+ return 1;
+ return 0;
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+ debug("spi_cs_activate: bus=%u cs=%u\n", slave->bus, slave->cs);
+ at91_set_pio_output(cs_to_portbit[slave->bus][slave->cs].port,
+ cs_to_portbit[slave->bus][slave->cs].bit, 0);
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+ debug("spi_cs_deactivate: bus=%u cs=%u\n", slave->bus, slave->cs);
+ at91_set_pio_output(cs_to_portbit[slave->bus][slave->cs].port,
+ cs_to_portbit[slave->bus][slave->cs].bit, 1);
+}
+