/*
+ * 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.
*
*/
#define I2C_RXTX_LEN 128 /* maximum tx/rx buffer length */
-#ifdef CONFIG_I2C_MULTI_BUS
-#define MAX_I2C_BUS 2
-#define I2C_MULTI_BUS 1
+#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
-#define MAX_I2C_BUS 1
-#define I2C_MULTI_BUS 0
-#endif
-
-#if !defined(CONFIG_SYS_MAX_I2C_BUS)
-#define CONFIG_SYS_MAX_I2C_BUS MAX_I2C_BUS
+/* we use i2c muxes */
+#undef CONFIG_SYS_I2C_DIRECT_BUS
#endif
/* define the I2C bus number for RTC and DTT if not already done */
#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"}
+#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);
void i2c_board_late_init(void);
#endif
-#if defined(CONFIG_I2C_MUX)
-
-typedef struct _mux {
- uchar chip;
- uchar channel;
- char *name;
- struct _mux *next;
-} I2C_MUX;
-
-typedef struct _mux_device {
- int busid;
- I2C_MUX *mux; /* List of muxes, to reach the device */
- struct _mux_device *next;
-} I2C_MUX_DEVICE;
-
-I2C_MUX_DEVICE *i2c_mux_search_device(int id);
-I2C_MUX_DEVICE *i2c_mux_ident_muxstring (uchar *buf);
-int i2x_mux_select_mux(int bus);
-int i2c_mux_ident_muxstring_f (uchar *buf);
+#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,
*/
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 0
+#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));
projects / karo-tx-uboot.git / blobdiff