4 * Changes for multibus/multiadapter I2C support.
9 * See file CREDITS for list of people who contributed to this
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 * The original I2C interface was
29 * AIRVENT SAM s.p.a - RIMINI(ITALY)
30 * but has been changed substantially.
37 * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
39 * The implementation MUST NOT use static or global variables if the
40 * I2C routines are used to read SDRAM configuration information
41 * because this is done before the memories are initialized. Limited
42 * use of stack-based variables are OK (the initial stack size is
45 * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
49 * Configuration items.
51 #define I2C_RXTX_LEN 128 /* maximum tx/rx buffer length */
53 #if !defined(CONFIG_SYS_I2C_MAX_HOPS)
54 /* no muxes used bus = i2c adapters */
55 #define CONFIG_SYS_I2C_DIRECT_BUS 1
56 #define CONFIG_SYS_I2C_MAX_HOPS 0
57 #define CONFIG_SYS_NUM_I2C_BUSES ll_entry_count(struct i2c_adapter, i2c)
59 /* we use i2c muxes */
60 #undef CONFIG_SYS_I2C_DIRECT_BUS
63 /* define the I2C bus number for RTC and DTT if not already done */
64 #if !defined(CONFIG_SYS_RTC_BUS_NUM)
65 #define CONFIG_SYS_RTC_BUS_NUM 0
67 #if !defined(CONFIG_SYS_DTT_BUS_NUM)
68 #define CONFIG_SYS_DTT_BUS_NUM 0
70 #if !defined(CONFIG_SYS_SPD_BUS_NUM)
71 #define CONFIG_SYS_SPD_BUS_NUM 0
75 void (*init)(struct i2c_adapter *adap, int speed,
77 int (*probe)(struct i2c_adapter *adap, uint8_t chip);
78 int (*read)(struct i2c_adapter *adap, uint8_t chip,
79 uint addr, int alen, uint8_t *buffer,
81 int (*write)(struct i2c_adapter *adap, uint8_t chip,
82 uint addr, int alen, uint8_t *buffer,
84 uint (*set_bus_speed)(struct i2c_adapter *adap,
93 #define U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
94 _set_speed, _speed, _slaveaddr, _hwadapnr, _name) \
100 .set_bus_speed = _set_speed, \
102 .slaveaddr = _slaveaddr, \
104 .hwadapnr = _hwadapnr, \
108 #define U_BOOT_I2C_ADAP_COMPLETE(_name, _init, _probe, _read, _write, \
109 _set_speed, _speed, _slaveaddr, _hwadapnr) \
110 ll_entry_declare(struct i2c_adapter, _name, i2c) = \
111 U_BOOT_I2C_MKENT_COMPLETE(_init, _probe, _read, _write, \
112 _set_speed, _speed, _slaveaddr, _hwadapnr, _name);
114 struct i2c_adapter *i2c_get_adapter(int index);
116 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
122 struct i2c_next_hop {
128 struct i2c_bus_hose {
130 struct i2c_next_hop next_hop[CONFIG_SYS_I2C_MAX_HOPS];
132 #define I2C_NULL_HOP {{-1, ""}, 0, 0}
133 extern struct i2c_bus_hose i2c_bus[];
135 #define I2C_ADAPTER(bus) i2c_bus[bus].adapter
137 #define I2C_ADAPTER(bus) bus
139 #define I2C_BUS gd->cur_i2c_bus
141 #define I2C_ADAP_NR(bus) i2c_get_adapter(I2C_ADAPTER(bus))
142 #define I2C_ADAP I2C_ADAP_NR(gd->cur_i2c_bus)
143 #define I2C_ADAP_HWNR (I2C_ADAP->hwadapnr)
145 #ifndef CONFIG_SYS_I2C_DIRECT_BUS
146 #define I2C_MUX_PCA9540_ID 1
147 #define I2C_MUX_PCA9540 {I2C_MUX_PCA9540_ID, "PCA9540B"}
148 #define I2C_MUX_PCA9542_ID 2
149 #define I2C_MUX_PCA9542 {I2C_MUX_PCA9542_ID, "PCA9542A"}
150 #define I2C_MUX_PCA9544_ID 3
151 #define I2C_MUX_PCA9544 {I2C_MUX_PCA9544_ID, "PCA9544A"}
152 #define I2C_MUX_PCA9547_ID 4
153 #define I2C_MUX_PCA9547 {I2C_MUX_PCA9547_ID, "PCA9547A"}
156 #ifndef I2C_SOFT_DECLARATIONS
157 # if defined(CONFIG_MPC8260)
158 # define I2C_SOFT_DECLARATIONS volatile ioport_t *iop = ioport_addr((immap_t *)CONFIG_SYS_IMMR, I2C_PORT);
159 # elif defined(CONFIG_8xx)
160 # define I2C_SOFT_DECLARATIONS volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
162 # elif (defined(CONFIG_AT91RM9200) || \
163 defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9261) || \
164 defined(CONFIG_AT91SAM9263)) && !defined(CONFIG_AT91_LEGACY)
165 # define I2C_SOFT_DECLARATIONS at91_pio_t *pio = (at91_pio_t *) ATMEL_BASE_PIOA;
167 # define I2C_SOFT_DECLARATIONS
172 /* Set default value for the I2C bus speed on 8xx. In the
173 * future, we'll define these in all 8xx board config files.
175 #ifndef CONFIG_SYS_I2C_SPEED
176 #define CONFIG_SYS_I2C_SPEED 50000
181 * Many boards/controllers/drivers don't support an I2C slave interface so
182 * provide a default slave address for them for use in common code. A real
183 * value for CONFIG_SYS_I2C_SLAVE should be defined for any board which does
184 * support a slave interface.
186 #ifndef CONFIG_SYS_I2C_SLAVE
187 #define CONFIG_SYS_I2C_SLAVE 0xfe
191 * Initialization, must be called once on start up, may be called
192 * repeatedly to change the speed and slave addresses.
194 void i2c_init(int speed, int slaveaddr);
195 void i2c_init_board(void);
196 #ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
197 void i2c_board_late_init(void);
200 #if defined(CONFIG_I2C_MUX)
202 typedef struct _mux {
209 typedef struct _mux_device {
211 I2C_MUX *mux; /* List of muxes, to reach the device */
212 struct _mux_device *next;
215 I2C_MUX_DEVICE *i2c_mux_search_device(int id);
216 I2C_MUX_DEVICE *i2c_mux_ident_muxstring (uchar *buf);
217 int i2x_mux_select_mux(int bus);
218 int i2c_mux_ident_muxstring_f (uchar *buf);
221 #ifdef CONFIG_SYS_I2C
223 * Initialization, must be called once on start up, may be called
224 * repeatedly to change the speed and slave addresses.
226 void i2c_init(unsigned int speed, int slaveaddr);
227 #ifdef CONFIG_SYS_I2C_INIT_BOARD
228 void i2c_init_board(void);
234 * Returns index of currently active I2C bus. Zero-based.
236 unsigned int i2c_get_bus_num(void);
241 * Change the active I2C bus. Subsequent read/write calls will
244 * bus - bus index, zero based
246 * Returns: 0 on success, not 0 on failure
249 int i2c_set_bus_num(unsigned int bus);
254 * Initializes all I2C adapters in the system. All i2c_adap structures must
255 * be initialized beforehead with function pointers and data, including
256 * speed and slaveaddr. Returns 0 on success, non-0 on failure.
258 void i2c_init_all(void);
261 * Probe the given I2C chip address. Returns 0 if a chip responded,
264 int i2c_probe(uint8_t chip);
267 * Read/Write interface:
268 * chip: I2C chip address, range 0..127
269 * addr: Memory (register) address within the chip
270 * alen: Number of bytes to use for addr (typically 1, 2 for larger
271 * memories, 0 for register type devices with only one
273 * buffer: Where to read/write the data
274 * len: How many bytes to read/write
276 * Returns: 0 on success, not 0 on failure
278 int i2c_read(uint8_t chip, unsigned int addr, int alen,
279 uint8_t *buffer, int len);
281 int i2c_write(uint8_t chip, unsigned int addr, int alen,
282 uint8_t *buffer, int len);
285 * Utility routines to read/write registers.
287 uint8_t i2c_reg_read(uint8_t addr, uint8_t reg);
289 void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val);
294 * Change the speed of the active I2C bus
296 * speed - bus speed in Hz
298 * Returns: new bus speed
301 unsigned int i2c_set_bus_speed(unsigned int speed);
306 * Returns speed of currently active I2C bus in Hz
309 unsigned int i2c_get_bus_speed(void);
314 * Adjusts I2C pointers after U-Boot is relocated to DRAM
316 void i2c_reloc_fixup(void);
320 * Probe the given I2C chip address. Returns 0 if a chip responded,
323 int i2c_probe(uchar chip);
326 * Read/Write interface:
327 * chip: I2C chip address, range 0..127
328 * addr: Memory (register) address within the chip
329 * alen: Number of bytes to use for addr (typically 1, 2 for larger
330 * memories, 0 for register type devices with only one
332 * buffer: Where to read/write the data
333 * len: How many bytes to read/write
335 * Returns: 0 on success, not 0 on failure
337 int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len);
338 int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len);
341 * Utility routines to read/write registers.
343 static inline u8 i2c_reg_read(u8 addr, u8 reg)
348 /* MPC8xx needs this. Maybe one day we can get rid of it. */
349 i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
353 printf("%s: addr=0x%02x, reg=0x%02x\n", __func__, addr, reg);
356 i2c_read(addr, reg, 1, &buf, 1);
361 static inline void i2c_reg_write(u8 addr, u8 reg, u8 val)
364 /* MPC8xx needs this. Maybe one day we can get rid of it. */
365 i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
369 printf("%s: addr=0x%02x, reg=0x%02x, val=0x%02x\n",
370 __func__, addr, reg, val);
373 i2c_write(addr, reg, 1, &val, 1);
377 * Functions for setting the current I2C bus and its speed
383 * Change the active I2C bus. Subsequent read/write calls will
386 * bus - bus index, zero based
388 * Returns: 0 on success, not 0 on failure
391 int i2c_set_bus_num(unsigned int bus);
396 * Returns index of currently active I2C bus. Zero-based.
399 unsigned int i2c_get_bus_num(void);
404 * Change the speed of the active I2C bus
406 * speed - bus speed in Hz
408 * Returns: 0 on success, not 0 on failure
411 int i2c_set_bus_speed(unsigned int);
416 * Returns speed of currently active I2C bus in Hz
419 unsigned int i2c_get_bus_speed(void);
420 #endif /* CONFIG_SYS_I2C */
423 * only for backwardcompatibility, should go away if we switched
424 * completely to new multibus support.
426 #if defined(CONFIG_SYS_I2C) || defined(CONFIG_I2C_MULTI_BUS)
427 # if !defined(CONFIG_SYS_MAX_I2C_BUS)
428 # define CONFIG_SYS_MAX_I2C_BUS 2
430 # define I2C_MULTI_BUS 0
432 # define CONFIG_SYS_MAX_I2C_BUS 1
433 # define I2C_MULTI_BUS 0
436 /* NOTE: These two functions MUST be always_inline to avoid code growth! */
437 static inline unsigned int I2C_GET_BUS(void) __attribute__((always_inline));
438 static inline unsigned int I2C_GET_BUS(void)
440 return I2C_MULTI_BUS ? i2c_get_bus_num() : 0;
443 static inline void I2C_SET_BUS(unsigned int bus) __attribute__((always_inline));
444 static inline void I2C_SET_BUS(unsigned int bus)
447 i2c_set_bus_num(bus);
450 /* Multi I2C definitions */
452 I2C_0, I2C_1, I2C_2, I2C_3, I2C_4, I2C_5, I2C_6, I2C_7,
453 I2C_8, I2C_9, I2C_10,
456 /* Multi I2C busses handling */
457 #ifdef CONFIG_SOFT_I2C_MULTI_BUS
458 extern int get_multi_scl_pin(void);
459 extern int get_multi_sda_pin(void);
460 extern int multi_i2c_init(void);
464 * Get FDT values for i2c bus.
466 * @param blob Device tree blbo
467 * @return the number of I2C bus
469 void board_i2c_init(const void *blob);
472 * Find the I2C bus number by given a FDT I2C node.
474 * @param blob Device tree blbo
475 * @param node FDT I2C node to find
476 * @return the number of I2C bus (zero based), or -1 on error
478 int i2c_get_bus_num_fdt(int node);
481 * Reset the I2C bus represented by the given a FDT I2C node.
483 * @param blob Device tree blbo
484 * @param node FDT I2C node to find
485 * @return 0 if port was reset, -1 if not found
487 int i2c_reset_port_fdt(const void *blob, int node);