Add a common interface to fdt based SPI drivers. Each driver is represented by a table entry in fdt_spi_drivers[]. If there are multiple SPI drivers in the table, the first driver to return success from spi_init() will be registered as the SPI driver. Signed-off-by: Allen Martin <amartin@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com> Reviewed-by: Stephen Warren <swarren@nvidia.com>master
Allen Martin
12 years ago
committed by
Tom Warren
parent
6b3a03e112
commit
78f47b7353
@ -0,0 +1,171 @@ |
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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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#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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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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}; |
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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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