fdt_spi.c
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/*
* Common fdt based SPI driver front end
*
* Copyright (c) 2013 NVIDIA Corporation
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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 <malloc.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/arch/clock.h>
#include <asm/arch-tegra/clk_rst.h>
#include <asm/arch-tegra20/tegra20_sflash.h>
#include <asm/arch-tegra20/tegra20_slink.h>
#include <asm/arch-tegra114/tegra114_spi.h>
#include <spi.h>
#include <fdtdec.h>
DECLARE_GLOBAL_DATA_PTR;
struct fdt_spi_driver {
int compat;
int max_ctrls;
int (*init)(int *node_list, int count);
int (*claim_bus)(struct spi_slave *slave);
int (*release_bus)(struct spi_slave *slave);
int (*cs_is_valid)(unsigned int bus, unsigned int cs);
struct spi_slave *(*setup_slave)(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode);
void (*free_slave)(struct spi_slave *slave);
void (*cs_activate)(struct spi_slave *slave);
void (*cs_deactivate)(struct spi_slave *slave);
int (*xfer)(struct spi_slave *slave, unsigned int bitlen,
const void *data_out, void *data_in, unsigned long flags);
};
static struct fdt_spi_driver fdt_spi_drivers[] = {
#ifdef CONFIG_TEGRA20_SFLASH
{
.compat = COMPAT_NVIDIA_TEGRA20_SFLASH,
.max_ctrls = 1,
.init = tegra20_spi_init,
.claim_bus = tegra20_spi_claim_bus,
.cs_is_valid = tegra20_spi_cs_is_valid,
.setup_slave = tegra20_spi_setup_slave,
.free_slave = tegra20_spi_free_slave,
.cs_activate = tegra20_spi_cs_activate,
.cs_deactivate = tegra20_spi_cs_deactivate,
.xfer = tegra20_spi_xfer,
},
#endif
#ifdef CONFIG_TEGRA20_SLINK
{
.compat = COMPAT_NVIDIA_TEGRA20_SLINK,
.max_ctrls = CONFIG_TEGRA_SLINK_CTRLS,
.init = tegra30_spi_init,
.claim_bus = tegra30_spi_claim_bus,
.cs_is_valid = tegra30_spi_cs_is_valid,
.setup_slave = tegra30_spi_setup_slave,
.free_slave = tegra30_spi_free_slave,
.cs_activate = tegra30_spi_cs_activate,
.cs_deactivate = tegra30_spi_cs_deactivate,
.xfer = tegra30_spi_xfer,
},
#endif
#ifdef CONFIG_TEGRA114_SPI
{
.compat = COMPAT_NVIDIA_TEGRA114_SPI,
.max_ctrls = CONFIG_TEGRA114_SPI_CTRLS,
.init = tegra114_spi_init,
.claim_bus = tegra114_spi_claim_bus,
.cs_is_valid = tegra114_spi_cs_is_valid,
.setup_slave = tegra114_spi_setup_slave,
.free_slave = tegra114_spi_free_slave,
.cs_activate = tegra114_spi_cs_activate,
.cs_deactivate = tegra114_spi_cs_deactivate,
.xfer = tegra114_spi_xfer,
},
#endif
};
static struct fdt_spi_driver *driver;
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
if (!driver)
return 0;
else if (!driver->cs_is_valid)
return 1;
else
return driver->cs_is_valid(bus, cs);
}
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
if (!driver || !driver->setup_slave)
return NULL;
return driver->setup_slave(bus, cs, max_hz, mode);
}
void spi_free_slave(struct spi_slave *slave)
{
if (driver && driver->free_slave)
return driver->free_slave(slave);
}
static int spi_init_driver(struct fdt_spi_driver *driver)
{
int count;
int node_list[driver->max_ctrls];
count = fdtdec_find_aliases_for_id(gd->fdt_blob, "spi",
driver->compat,
node_list,
driver->max_ctrls);
return driver->init(node_list, count);
}
void spi_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(fdt_spi_drivers); i++) {
driver = &fdt_spi_drivers[i];
if (!spi_init_driver(driver))
break;
}
if (i == ARRAY_SIZE(fdt_spi_drivers))
driver = NULL;
}
int spi_claim_bus(struct spi_slave *slave)
{
if (!driver)
return 1;
if (!driver->claim_bus)
return 0;
return driver->claim_bus(slave);
}
void spi_release_bus(struct spi_slave *slave)
{
if (driver && driver->release_bus)
driver->release_bus(slave);
}
void spi_cs_activate(struct spi_slave *slave)
{
if (driver && driver->cs_activate)
driver->cs_activate(slave);
}
void spi_cs_deactivate(struct spi_slave *slave)
{
if (driver && driver->cs_deactivate)
driver->cs_deactivate(slave);
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
const void *data_out, void *data_in, unsigned long flags)
{
if (!driver || !driver->xfer)
return -1;
return driver->xfer(slave, bitlen, data_out, data_in, flags);
}