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/*
* arch/arm/mach-tegra/tegra3_tsensor.c
*
* Copyright (C) 2011 NVIDIA Corporation.
*
* 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.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#ifdef CONFIG_SENSORS_TEGRA_TSENSOR
#include <linux/io.h>
#include <linux/ioport.h>
#include <mach/iomap.h>
#include <mach/tsensor.h>
#include <mach/tegra_fuse.h>
#include "board.h"
#include "devices.h"
#include "fuse.h"
static struct tegra_tsensor_platform_data tsensor_data = {
.hysteresis = 5,
.sw_intr_temperature = 75,
.hw_clk_div_temperature = 80,
.hw_reset_temperature = 90,
};
/* fuse revision constants used for tsensor */
#define TSENSOR_FUSE_REVISION_DECIMAL 8
#define TSENSOR_FUSE_REVISION_INTEGER 0
/* scratch register offsets needed for powering off PMU */
#define SCRATCH54_OFFSET 0x258
#define SCRATCH55_OFFSET 0x25C
/* scratch 54 register bit field offsets */
#define PMU_OFF_DATA_OFFSET 8
/* scratch 55 register bit field offsets */
#define RESET_TEGRA_OFFSET 31
#define CONTROLLER_TYPE_OFFSET 30
#define I2C_CONTROLLER_ID_OFFSET 27
#define PINMUX_OFFSET 24
#define CHECKSUM_OFFSET 16
#define PMU_16BIT_SUPPORT_OFFSET 15
/* scratch 55 register bit field masks */
#define RESET_TEGRA_MASK 0x1
#define CONTROLLER_TYPE_MASK 0x1
#define I2C_CONTROLLER_ID_MASK 0x7
#define PINMUX_MASK 0x7
#define CHECKSUM_MASK 0xff
#define PMU_16BIT_SUPPORT_MASK 0x1
void __init tegra3_tsensor_init(struct tegra_tsensor_pmu_data *data)
{
unsigned int reg;
int err;
u32 val, checksum;
void __iomem *pMem = NULL;
/* tsensor driver is instantiated based on fuse revision */
err = tegra_fuse_get_revision(®);
if (err)
goto labelEnd;
pr_info("\nTegra3 fuse revision %d ", reg);
if (reg < TSENSOR_FUSE_REVISION_DECIMAL)
goto labelEnd;
if (!data)
goto labelSkipPowerOff;
if (!request_mem_region(TEGRA_PMC_BASE +
SCRATCH54_OFFSET, 8, "tegra-tsensor"))
pr_err(" [%s, line=%d]: Error mem busy\n",
__func__, __LINE__);
pMem = ioremap(TEGRA_PMC_BASE + SCRATCH54_OFFSET, 8);
if (!pMem)
pr_err(" [%s, line=%d]: can't ioremap "
"pmc iomem\n", __FILE__, __LINE__);
/*
* Fill scratch registers to power off the device
* in case if temperature crosses threshold TH3
*/
val = (data->poweroff_reg_data << PMU_OFF_DATA_OFFSET) |
data->poweroff_reg_addr;
writel(val, pMem);
val = ((data->reset_tegra & RESET_TEGRA_MASK) << RESET_TEGRA_OFFSET) |
((data->controller_type & CONTROLLER_TYPE_MASK) <<
CONTROLLER_TYPE_OFFSET) |
((data->i2c_controller_id & I2C_CONTROLLER_ID_MASK) <<
I2C_CONTROLLER_ID_OFFSET) |
((data->pinmux & PINMUX_MASK) << PINMUX_OFFSET) |
((data->pmu_16bit_ops & PMU_16BIT_SUPPORT_MASK) <<
PMU_16BIT_SUPPORT_OFFSET) | data->pmu_i2c_addr;
checksum = data->poweroff_reg_addr +
data->poweroff_reg_data + (val & 0xFF) +
((val >> 8) & 0xFF) + ((val >> 24) & 0xFF);
checksum &= 0xFF;
checksum = 0x100 - checksum;
val |= (checksum << CHECKSUM_OFFSET);
writel(val, pMem + 4);
labelSkipPowerOff:
/* set platform data for device before register */
tegra_tsensor_device.dev.platform_data = &tsensor_data;
platform_device_register(&tegra_tsensor_device);
labelEnd:
return;
}
#else
void __init tegra3_tsensor_init(void) { }
#endif
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