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77c42e80b9
Add driver for tegra114 SPI controller. This controller is not compatible with either the tegra20 or tegra30 controllers, so it requires a new driver. Signed-off-by: Allen Martin <amartin@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com> Reviewed-by: Stephen Warren <swarren@nvidia.com>
186 lines
4.8 KiB
C
186 lines
4.8 KiB
C
/*
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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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#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 <asm/arch-tegra114/tegra114_spi.h>
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#include <spi.h>
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#include <fdtdec.h>
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DECLARE_GLOBAL_DATA_PTR;
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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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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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#ifdef CONFIG_TEGRA114_SPI
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{
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.compat = COMPAT_NVIDIA_TEGRA114_SPI,
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.max_ctrls = CONFIG_TEGRA114_SPI_CTRLS,
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.init = tegra114_spi_init,
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.claim_bus = tegra114_spi_claim_bus,
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.cs_is_valid = tegra114_spi_cs_is_valid,
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.setup_slave = tegra114_spi_setup_slave,
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.free_slave = tegra114_spi_free_slave,
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.cs_activate = tegra114_spi_cs_activate,
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.cs_deactivate = tegra114_spi_cs_deactivate,
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.xfer = tegra114_spi_xfer,
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},
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#endif
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};
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static struct fdt_spi_driver *driver;
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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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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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return driver->setup_slave(bus, cs, max_hz, mode);
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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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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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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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void spi_init(void)
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{
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int i;
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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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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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return driver->claim_bus(slave);
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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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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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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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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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return driver->xfer(slave, bitlen, data_out, data_in, flags);
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}
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