zephyr/drivers/i2c/i2c_dw.h

131 lines
3.6 KiB
C

/* dw_i2c.h - header for Design Ware I2C operations */
/*
* Copyright (c) 2015 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __DRIVERS_I2C_DW_H
#define __DRIVERS_I2C_DW_H
#include <i2c.h>
#include <stdbool.h>
#ifdef CONFIG_PCI
#include <pci/pci.h>
#include <pci/pci_mgr.h>
#endif /* CONFIG_PCI */
#define I2C_DW_MAGIC_KEY 0x44570140
typedef void (*i2c_isr_cb_t)(struct device *port);
#define IC_ACTIVITY (1 << 0)
#define IC_ENABLE_BIT (1 << 0)
/* dev->state values from IC_DATA_CMD Data transfer mode settings (bit 8) */
#define I2C_DW_STATE_READY (0)
#define I2C_DW_CMD_SEND (1 << 0)
#define I2C_DW_CMD_RECV (1 << 1)
#define I2C_DW_CMD_ERROR (1 << 2)
#define I2C_DW_BUSY (1 << 3)
#define DW_ENABLE_TX_INT_I2C_MASTER (DW_INTR_STAT_TX_OVER | \
DW_INTR_STAT_TX_EMPTY | \
DW_INTR_STAT_TX_ABRT | \
DW_INTR_STAT_STOP_DET)
#define DW_ENABLE_RX_INT_I2C_MASTER (DW_INTR_STAT_RX_UNDER | \
DW_INTR_STAT_RX_OVER | \
DW_INTR_STAT_RX_FULL | \
DW_INTR_STAT_STOP_DET)
#define DW_ENABLE_TX_INT_I2C_SLAVE (DW_INTR_STAT_RD_REQ | \
DW_INTR_STAT_TX_ABRT | \
DW_INTR_STAT_STOP_DET)
#define DW_ENABLE_RX_INT_I2C_SLAVE (DW_INTR_STAT_RX_FULL | \
DW_INTR_STAT_STOP_DET)
#define DW_DISABLE_ALL_I2C_INT 0x00000000
/* IC_CON Low count and high count default values */
/* TODO verify values for high and fast speed */
#define I2C_STD_HCNT (CONFIG_I2C_CLOCK_SPEED * 4)
#define I2C_STD_LCNT (CONFIG_I2C_CLOCK_SPEED * 5)
#define I2C_FS_HCNT ((CONFIG_I2C_CLOCK_SPEED * 6) / 8)
#define I2C_FS_LCNT ((CONFIG_I2C_CLOCK_SPEED * 7) / 8)
#define I2C_HS_HCNT ((CONFIG_I2C_CLOCK_SPEED * 6) / 8)
#define I2C_HS_LCNT ((CONFIG_I2C_CLOCK_SPEED * 7) / 8)
/*
* DesignWare speed values don't directly translate from the Zephyr speed
* selections in include/i2c.h so here we do a little translation
*/
#define I2C_DW_SPEED_STANDARD 0x1
#define I2C_DW_SPEED_FAST 0x2
#define I2C_DW_SPEED_FAST_PLUS 0x2
#define I2C_DW_SPEED_HIGH 0x3
/*
* These values have been randomly selected. It would be good to test different
* watermark levels for performance capabilities
*/
#define I2C_DW_TX_WATERMARK 2
#define I2C_DW_RX_WATERMARK 7
#define I2C_DW_FIFO_DEPTH 16
struct i2c_dw_rom_config {
uint32_t base_address;
uint32_t interrupt_vector;
uint32_t interrupt_mask;
#ifdef CONFIG_PCI
struct pci_dev_info pci_dev;
#endif /* CONFIG_PCI */
i2c_isr_cb_t config_func;
#ifdef CONFIG_I2C_DW_SHARED_IRQ
char *shared_irq_dev_name;
#endif /* CONFIG_I2C_DW_SHARED_IRQ */
};
struct i2c_dw_dev_config {
union dev_config app_config;
volatile uint8_t state; /* last direction of transfer */
uint8_t slave_mode;
uint8_t request_bytes;
uint8_t rx_len;
uint8_t *rx_buffer;
uint8_t tx_len;
uint8_t *tx_buffer;
bool support_hs_mode;
uint16_t hcnt;
uint16_t lcnt;
i2c_callback cb;
};
void i2c_dw_isr(struct device *port);
extern int i2c_dw_initialize(struct device *port);
#endif /* __DRIVERS_I2C_DW_H */