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+/*
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+ * Common fdt based SPI driver front end
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+ *
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+ * Copyright (c) 2013 NVIDIA Corporation
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+ *
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+ * See file CREDITS for list of people who contributed to this
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+ * project.
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+ *
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+ * This software is licensed under the terms of the GNU General Public
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+ * License version 2, as published by the Free Software Foundation, and
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+ * may be copied, distributed, and modified under those terms.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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+ * MA 02111-1307 USA
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+ */
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+
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+#include <common.h>
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+#include <malloc.h>
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+#include <asm/io.h>
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+#include <asm/gpio.h>
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+#include <asm/arch/clock.h>
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+#include <asm/arch-tegra/clk_rst.h>
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+#include <asm/arch-tegra20/tegra20_sflash.h>
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+#include <asm/arch-tegra20/tegra20_slink.h>
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+#include <spi.h>
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+#include <fdtdec.h>
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+
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+DECLARE_GLOBAL_DATA_PTR;
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+
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+struct fdt_spi_driver {
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+ int compat;
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+ int max_ctrls;
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+ int (*init)(int *node_list, int count);
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+ int (*claim_bus)(struct spi_slave *slave);
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+ int (*release_bus)(struct spi_slave *slave);
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+ int (*cs_is_valid)(unsigned int bus, unsigned int cs);
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+ struct spi_slave *(*setup_slave)(unsigned int bus, unsigned int cs,
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+ unsigned int max_hz, unsigned int mode);
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+ void (*free_slave)(struct spi_slave *slave);
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+ void (*cs_activate)(struct spi_slave *slave);
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+ void (*cs_deactivate)(struct spi_slave *slave);
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+ int (*xfer)(struct spi_slave *slave, unsigned int bitlen,
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+ const void *data_out, void *data_in, unsigned long flags);
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+};
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+
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+static struct fdt_spi_driver fdt_spi_drivers[] = {
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+#ifdef CONFIG_TEGRA20_SFLASH
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+ {
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+ .compat = COMPAT_NVIDIA_TEGRA20_SFLASH,
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+ .max_ctrls = 1,
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+ .init = tegra20_spi_init,
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+ .claim_bus = tegra20_spi_claim_bus,
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+ .cs_is_valid = tegra20_spi_cs_is_valid,
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+ .setup_slave = tegra20_spi_setup_slave,
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+ .free_slave = tegra20_spi_free_slave,
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+ .cs_activate = tegra20_spi_cs_activate,
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+ .cs_deactivate = tegra20_spi_cs_deactivate,
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+ .xfer = tegra20_spi_xfer,
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+ },
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+#endif
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+#ifdef CONFIG_TEGRA20_SLINK
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+ {
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+ .compat = COMPAT_NVIDIA_TEGRA20_SLINK,
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+ .max_ctrls = CONFIG_TEGRA_SLINK_CTRLS,
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+ .init = tegra30_spi_init,
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+ .claim_bus = tegra30_spi_claim_bus,
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+ .cs_is_valid = tegra30_spi_cs_is_valid,
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+ .setup_slave = tegra30_spi_setup_slave,
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+ .free_slave = tegra30_spi_free_slave,
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+ .cs_activate = tegra30_spi_cs_activate,
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+ .cs_deactivate = tegra30_spi_cs_deactivate,
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+ .xfer = tegra30_spi_xfer,
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+ },
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+#endif
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+};
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+
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+static struct fdt_spi_driver *driver;
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+
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+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
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+{
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+ if (!driver)
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+ return 0;
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+ else if (!driver->cs_is_valid)
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+ return 1;
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+ else
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+ return driver->cs_is_valid(bus, cs);
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+}
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+
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+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
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+ unsigned int max_hz, unsigned int mode)
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+{
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+ if (!driver || !driver->setup_slave)
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+ return NULL;
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+
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+ return driver->setup_slave(bus, cs, max_hz, mode);
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+}
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+
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+void spi_free_slave(struct spi_slave *slave)
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+{
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+ if (driver && driver->free_slave)
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+ return driver->free_slave(slave);
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+}
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+
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+static int spi_init_driver(struct fdt_spi_driver *driver)
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+{
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+ int count;
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+ int node_list[driver->max_ctrls];
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+
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+ count = fdtdec_find_aliases_for_id(gd->fdt_blob, "spi",
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+ driver->compat,
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+ node_list,
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+ driver->max_ctrls);
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+ return driver->init(node_list, count);
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+}
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+
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+void spi_init(void)
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+{
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+ int i;
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+
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+ for (i = 0; i < ARRAY_SIZE(fdt_spi_drivers); i++) {
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+ driver = &fdt_spi_drivers[i];
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+ if (!spi_init_driver(driver))
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+ break;
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+ }
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+ if (i == ARRAY_SIZE(fdt_spi_drivers))
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+ driver = NULL;
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+}
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+
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+int spi_claim_bus(struct spi_slave *slave)
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+{
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+ if (!driver)
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+ return 1;
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+ if (!driver->claim_bus)
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+ return 0;
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+
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+ return driver->claim_bus(slave);
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+}
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+
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+void spi_release_bus(struct spi_slave *slave)
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+{
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+ if (driver && driver->release_bus)
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+ driver->release_bus(slave);
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+}
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+
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+void spi_cs_activate(struct spi_slave *slave)
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+{
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+ if (driver && driver->cs_activate)
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+ driver->cs_activate(slave);
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+}
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+
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+void spi_cs_deactivate(struct spi_slave *slave)
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+{
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+ if (driver && driver->cs_deactivate)
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+ driver->cs_deactivate(slave);
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+}
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+
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+int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
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+ const void *data_out, void *data_in, unsigned long flags)
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+{
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+ if (!driver || !driver->xfer)
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+ return -1;
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+
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+ return driver->xfer(slave, bitlen, data_out, data_in, flags);
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+}
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Allen Martin