/*
+ * Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net>
+ * Copyright (C) 2009 - 2013 Heiko Schocher <hs@denx.de>
+ * Changes for multibus/multiadapter I2C support.
+ *
* (C) Copyright 2001
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * 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
+ * SPDX-License-Identifier: GPL-2.0+
*
* The original I2C interface was
* (C) 2000 by Paolo Scaffardi (arsenio@tin.it)
*/
#define I2C_RXTX_LEN 128 /* maximum tx/rx buffer length */
+#if !defined(CONFIG_SYS_I2C_MAX_HOPS)
+/* no muxes used bus = i2c adapters */
+#define CONFIG_SYS_I2C_DIRECT_BUS 1
+#define CONFIG_SYS_I2C_MAX_HOPS 0
+#define CONFIG_SYS_NUM_I2C_BUSES ll_entry_count(struct i2c_adapter, i2c)
+#else
+/* we use i2c muxes */
+#undef CONFIG_SYS_I2C_DIRECT_BUS
+#endif
+
+/* define the I2C bus number for RTC and DTT if not already done */
+#if !defined(CONFIG_SYS_RTC_BUS_NUM)
+#define CONFIG_SYS_RTC_BUS_NUM 0
+#endif
+#if !defined(CONFIG_SYS_DTT_BUS_NUM)
+#define CONFIG_SYS_DTT_BUS_NUM 0
+#endif
+#if !defined(CONFIG_SYS_SPD_BUS_NUM)
+#define CONFIG_SYS_SPD_BUS_NUM 0
+#endif
+
+struct i2c_adapter {
+ void (*init)(struct i2c_adapter *adap, int speed,
+ int slaveaddr);
+ int (*probe)(struct i2c_adapter *adap, uint8_t chip);
+ int (*read)(struct i2c_adapter *adap, uint8_t chip,
+ uint addr, int alen, uint8_t *buffer,
+ int len);
+ int (*write)(struct i2c_adapter *adap, uint8_t chip,
+ uint addr, int alen, uint8_t *buffer,
+ int len);
+ uint (*set_bus_speed)(struct i2c_adapter *adap,
+ uint speed);
+ int speed;
+ int slaveaddr;
+ int init_done;
+ int hwadapnr;
+ char *name;
+};
+
+#define U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
+ _set_speed, _speed, _slaveaddr, _hwadapnr, _name) \
+ { \
+ .init = _init, \
+ .probe = _probe, \
+ .read = _read, \
+ .write = _write, \
+ .set_bus_speed = _set_speed, \
+ .speed = _speed, \
+ .slaveaddr = _slaveaddr, \
+ .init_done = 0, \
+ .hwadapnr = _hwadapnr, \
+ .name = #_name \
+};
+
+#define U_BOOT_I2C_ADAP_COMPLETE(_name, _init, _probe, _read, _write, \
+ _set_speed, _speed, _slaveaddr, _hwadapnr) \
+ ll_entry_declare(struct i2c_adapter, _name, i2c) = \
+ U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
+ _set_speed, _speed, _slaveaddr, _hwadapnr, _name);
+
+struct i2c_adapter *i2c_get_adapter(int index);
+
+#ifndef CONFIG_SYS_I2C_DIRECT_BUS
+struct i2c_mux {
+ int id;
+ char name[16];
+};
+
+struct i2c_next_hop {
+ struct i2c_mux mux;
+ uint8_t chip;
+ uint8_t channel;
+};
+
+struct i2c_bus_hose {
+ int adapter;
+ struct i2c_next_hop next_hop[CONFIG_SYS_I2C_MAX_HOPS];
+};
+#define I2C_NULL_HOP {{-1, ""}, 0, 0}
+extern struct i2c_bus_hose i2c_bus[];
+
+#define I2C_ADAPTER(bus) i2c_bus[bus].adapter
+#else
+#define I2C_ADAPTER(bus) bus
+#endif
+#define I2C_BUS gd->cur_i2c_bus
+
+#define I2C_ADAP_NR(bus) i2c_get_adapter(I2C_ADAPTER(bus))
+#define I2C_ADAP I2C_ADAP_NR(gd->cur_i2c_bus)
+#define I2C_ADAP_HWNR (I2C_ADAP->hwadapnr)
+
+#ifndef CONFIG_SYS_I2C_DIRECT_BUS
+#define I2C_MUX_PCA9540_ID 1
+#define I2C_MUX_PCA9540 {I2C_MUX_PCA9540_ID, "PCA9540B"}
+#define I2C_MUX_PCA9542_ID 2
+#define I2C_MUX_PCA9542 {I2C_MUX_PCA9542_ID, "PCA9542A"}
+#define I2C_MUX_PCA9544_ID 3
+#define I2C_MUX_PCA9544 {I2C_MUX_PCA9544_ID, "PCA9544A"}
+#define I2C_MUX_PCA9547_ID 4
+#define I2C_MUX_PCA9547 {I2C_MUX_PCA9547_ID, "PCA9547A"}
+#define I2C_MUX_PCA9548_ID 5
+#define I2C_MUX_PCA9548 {I2C_MUX_PCA9548_ID, "PCA9548"}
+#endif
+
+#ifndef I2C_SOFT_DECLARATIONS
+# if defined(CONFIG_MPC8260)
+# define I2C_SOFT_DECLARATIONS volatile ioport_t *iop = ioport_addr((immap_t *)CONFIG_SYS_IMMR, I2C_PORT);
+# elif defined(CONFIG_8xx)
+# define I2C_SOFT_DECLARATIONS volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
+
+# elif (defined(CONFIG_AT91RM9200) || \
+ defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9261) || \
+ defined(CONFIG_AT91SAM9263))
+# define I2C_SOFT_DECLARATIONS at91_pio_t *pio = (at91_pio_t *) ATMEL_BASE_PIOA;
+# else
+# define I2C_SOFT_DECLARATIONS
+# endif
+#endif
+
+#ifdef CONFIG_8xx
+/* Set default value for the I2C bus speed on 8xx. In the
+ * future, we'll define these in all 8xx board config files.
+ */
+#ifndef CONFIG_SYS_I2C_SPEED
+#define CONFIG_SYS_I2C_SPEED 50000
+#endif
+#endif
+
+/*
+ * Many boards/controllers/drivers don't support an I2C slave interface so
+ * provide a default slave address for them for use in common code. A real
+ * value for CONFIG_SYS_I2C_SLAVE should be defined for any board which does
+ * support a slave interface.
+ */
+#ifndef CONFIG_SYS_I2C_SLAVE
+#define CONFIG_SYS_I2C_SLAVE 0xfe
+#endif
+
/*
* Initialization, must be called once on start up, may be called
* repeatedly to change the speed and slave addresses.
*/
void i2c_init(int speed, int slaveaddr);
-#ifdef CFG_I2C_INIT_BOARD
void i2c_init_board(void);
+#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
+void i2c_board_late_init(void);
+#endif
+
+#ifdef CONFIG_SYS_I2C
+/*
+ * i2c_get_bus_num:
+ *
+ * Returns index of currently active I2C bus. Zero-based.
+ */
+unsigned int i2c_get_bus_num(void);
+
+/*
+ * i2c_set_bus_num:
+ *
+ * Change the active I2C bus. Subsequent read/write calls will
+ * go to this one.
+ *
+ * bus - bus index, zero based
+ *
+ * Returns: 0 on success, not 0 on failure
+ *
+ */
+int i2c_set_bus_num(unsigned int bus);
+
+/*
+ * i2c_init_all():
+ *
+ * Initializes all I2C adapters in the system. All i2c_adap structures must
+ * be initialized beforehead with function pointers and data, including
+ * speed and slaveaddr. Returns 0 on success, non-0 on failure.
+ */
+void i2c_init_all(void);
+
+/*
+ * Probe the given I2C chip address. Returns 0 if a chip responded,
+ * not 0 on failure.
+ */
+int i2c_probe(uint8_t chip);
+
+/*
+ * Read/Write interface:
+ * chip: I2C chip address, range 0..127
+ * addr: Memory (register) address within the chip
+ * alen: Number of bytes to use for addr (typically 1, 2 for larger
+ * memories, 0 for register type devices with only one
+ * register)
+ * buffer: Where to read/write the data
+ * len: How many bytes to read/write
+ *
+ * Returns: 0 on success, not 0 on failure
+ */
+int i2c_read(uint8_t chip, unsigned int addr, int alen,
+ uint8_t *buffer, int len);
+
+int i2c_write(uint8_t chip, unsigned int addr, int alen,
+ uint8_t *buffer, int len);
+
+/*
+ * Utility routines to read/write registers.
+ */
+uint8_t i2c_reg_read(uint8_t addr, uint8_t reg);
+
+void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val);
+
+/*
+ * i2c_set_bus_speed:
+ *
+ * Change the speed of the active I2C bus
+ *
+ * speed - bus speed in Hz
+ *
+ * Returns: new bus speed
+ *
+ */
+unsigned int i2c_set_bus_speed(unsigned int speed);
+
+/*
+ * i2c_get_bus_speed:
+ *
+ * Returns speed of currently active I2C bus in Hz
+ */
+
+unsigned int i2c_get_bus_speed(void);
+
+/*
+ * i2c_reloc_fixup:
+ *
+ * Adjusts I2C pointers after U-Boot is relocated to DRAM
+ */
+void i2c_reloc_fixup(void);
+#if defined(CONFIG_SYS_I2C_SOFT)
+void i2c_soft_init(void);
+void i2c_soft_active(void);
+void i2c_soft_tristate(void);
+int i2c_soft_read(void);
+void i2c_soft_sda(int bit);
+void i2c_soft_scl(int bit);
+void i2c_soft_delay(void);
#endif
+#else
/*
* Probe the given I2C chip address. Returns 0 if a chip responded,
/*
* Utility routines to read/write registers.
*/
-uchar i2c_reg_read (uchar chip, uchar reg);
-void i2c_reg_write(uchar chip, uchar reg, uchar val);
+static inline u8 i2c_reg_read(u8 addr, u8 reg)
+{
+ u8 buf;
+
+#ifdef CONFIG_8xx
+ /* MPC8xx needs this. Maybe one day we can get rid of it. */
+ i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+#endif
+
+#ifdef DEBUG
+ printf("%s: addr=0x%02x, reg=0x%02x\n", __func__, addr, reg);
+#endif
+
+ i2c_read(addr, reg, 1, &buf, 1);
+
+ return buf;
+}
+
+static inline void i2c_reg_write(u8 addr, u8 reg, u8 val)
+{
+#ifdef CONFIG_8xx
+ /* MPC8xx needs this. Maybe one day we can get rid of it. */
+ i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+#endif
+
+#ifdef DEBUG
+ printf("%s: addr=0x%02x, reg=0x%02x, val=0x%02x\n",
+ __func__, addr, reg, val);
+#endif
+
+ i2c_write(addr, reg, 1, &val, 1);
+}
/*
* Functions for setting the current I2C bus and its speed
* Change the active I2C bus. Subsequent read/write calls will
* go to this one.
*
- * bus - bus index, zero based
+ * bus - bus index, zero based
*
- * Returns: 0 on success, not 0 on failure
+ * Returns: 0 on success, not 0 on failure
*
*/
-int i2c_set_bus_num(uchar bus);
+int i2c_set_bus_num(unsigned int bus);
/*
* i2c_get_bus_num:
* Returns index of currently active I2C bus. Zero-based.
*/
-uchar i2c_get_bus_num(void);
+unsigned int i2c_get_bus_num(void);
/*
* i2c_set_bus_speed:
*
* Change the speed of the active I2C bus
*
- * speed - bus speed in Hz
+ * speed - bus speed in Hz
*
- * Returns: 0 on success, not 0 on failure
+ * Returns: 0 on success, not 0 on failure
*
*/
-int i2c_set_bus_speed(int);
+int i2c_set_bus_speed(unsigned int);
/*
* i2c_get_bus_speed:
* Returns speed of currently active I2C bus in Hz
*/
-int i2c_get_bus_speed(void);
+unsigned int i2c_get_bus_speed(void);
+#endif /* CONFIG_SYS_I2C */
+/*
+ * only for backwardcompatibility, should go away if we switched
+ * completely to new multibus support.
+ */
+#if defined(CONFIG_SYS_I2C) || defined(CONFIG_I2C_MULTI_BUS)
+# if !defined(CONFIG_SYS_MAX_I2C_BUS)
+# define CONFIG_SYS_MAX_I2C_BUS 2
+# endif
+# define I2C_MULTI_BUS 1
+#else
+# define CONFIG_SYS_MAX_I2C_BUS 1
+# define I2C_MULTI_BUS 0
+#endif
+
+/* NOTE: These two functions MUST be always_inline to avoid code growth! */
+static inline unsigned int I2C_GET_BUS(void) __attribute__((always_inline));
+static inline unsigned int I2C_GET_BUS(void)
+{
+ return I2C_MULTI_BUS ? i2c_get_bus_num() : 0;
+}
+
+static inline void I2C_SET_BUS(unsigned int bus) __attribute__((always_inline));
+static inline void I2C_SET_BUS(unsigned int bus)
+{
+ if (I2C_MULTI_BUS)
+ i2c_set_bus_num(bus);
+}
+
+/* Multi I2C definitions */
+enum {
+ I2C_0, I2C_1, I2C_2, I2C_3, I2C_4, I2C_5, I2C_6, I2C_7,
+ I2C_8, I2C_9, I2C_10,
+};
+
+/* Multi I2C busses handling */
+#ifdef CONFIG_SOFT_I2C_MULTI_BUS
+extern int get_multi_scl_pin(void);
+extern int get_multi_sda_pin(void);
+extern int multi_i2c_init(void);
+#endif
+
+/**
+ * Get FDT values for i2c bus.
+ *
+ * @param blob Device tree blbo
+ * @return the number of I2C bus
+ */
+void board_i2c_init(const void *blob);
+
+/**
+ * Find the I2C bus number by given a FDT I2C node.
+ *
+ * @param blob Device tree blbo
+ * @param node FDT I2C node to find
+ * @return the number of I2C bus (zero based), or -1 on error
+ */
+int i2c_get_bus_num_fdt(int node);
+
+/**
+ * Reset the I2C bus represented by the given a FDT I2C node.
+ *
+ * @param blob Device tree blbo
+ * @param node FDT I2C node to find
+ * @return 0 if port was reset, -1 if not found
+ */
+int i2c_reset_port_fdt(const void *blob, int node);
#endif /* _I2C_H_ */