diff options
| -rw-r--r-- | drivers/i2c/Makefile | 1 | ||||
| -rw-r--r-- | drivers/i2c/i2c_core.c | 414 | ||||
| -rw-r--r-- | include/asm-generic/global_data.h | 3 | ||||
| -rw-r--r-- | include/i2c.h | 215 |
4 files changed, 624 insertions, 9 deletions
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index 72e85a349a..06b211d4a2 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -46,6 +46,7 @@ COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o COBJS-$(CONFIG_U8500_I2C) += u8500_i2c.o COBJS-$(CONFIG_SH_I2C) += sh_i2c.o COBJS-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o +COBJS-$(CONFIG_SYS_I2C) += i2c_core.o COBJS-$(CONFIG_ZYNQ_I2C) += zynq_i2c.o COBJS := $(COBJS-y) diff --git a/drivers/i2c/i2c_core.c b/drivers/i2c/i2c_core.c new file mode 100644 index 0000000000..3c01893c9c --- /dev/null +++ b/drivers/i2c/i2c_core.c @@ -0,0 +1,414 @@ +/* + * Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net> + * + * (C) Copyright 2012 + * Heiko Schocher, DENX Software Engineering, hs@denx.de. + * + * Multibus/multiadapter I2C core functions (wrappers) + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <common.h> +#include <i2c.h> + +struct i2c_adapter *i2c_get_adapter(int index) +{ + struct i2c_adapter *i2c_adap_p = ll_entry_start(struct i2c_adapter, + i2c); + int max = ll_entry_count(struct i2c_adapter, i2c); + int i; + + if (index >= max) { + printf("Error, wrong i2c adapter %d max %d possible\n", + index, max); + return i2c_adap_p; + } + if (index == 0) + return i2c_adap_p; + + for (i = 0; i < index; i++) + i2c_adap_p++; + + return i2c_adap_p; +} + +#if !defined(CONFIG_SYS_I2C_DIRECT_BUS) +struct i2c_bus_hose i2c_bus[CONFIG_SYS_NUM_I2C_BUSES] = + CONFIG_SYS_I2C_BUSES; +#endif + +DECLARE_GLOBAL_DATA_PTR; + +void i2c_reloc_fixup(void) +{ +#if defined(CONFIG_NEEDS_MANUAL_RELOC) + struct i2c_adapter *i2c_adap_p = ll_entry_start(struct i2c_adapter, + i2c); + struct i2c_adapter *tmp = i2c_adap_p; + int max = ll_entry_count(struct i2c_adapter, i2c); + int i; + unsigned long addr; + + if (gd->reloc_off == 0) + return; + + for (i = 0; i < max; i++) { + /* adapter itself */ + addr = (unsigned long)i2c_adap_p; + addr += gd->reloc_off; + i2c_adap_p = (struct i2c_adapter *)addr; + /* i2c_init() */ + addr = (unsigned long)i2c_adap_p->init; + addr += gd->reloc_off; + i2c_adap_p->init = (void (*)(int, int))addr; + /* i2c_probe() */ + addr = (unsigned long)i2c_adap_p->probe; + addr += gd->reloc_off; + i2c_adap_p->probe = (int (*)(uint8_t))addr; + /* i2c_read() */ + addr = (unsigned long)i2c_adap_p->read; + addr += gd->reloc_off; + i2c_adap_p->read = (int (*)(uint8_t, uint, int, uint8_t *, + int))addr; + /* i2c_write() */ + addr = (unsigned long)i2c_adap_p->write; + addr += gd->reloc_off; + i2c_adap_p->write = (int (*)(uint8_t, uint, int, uint8_t *, + int))addr; + /* i2c_set_bus_speed() */ + addr = (unsigned long)i2c_adap_p->set_bus_speed; + addr += gd->reloc_off; + i2c_adap_p->set_bus_speed = (uint (*)(uint))addr; + /* name */ + addr = (unsigned long)i2c_adap_p->name; + addr += gd->reloc_off; + i2c_adap_p->name = (char *)addr; + tmp++; + i2c_adap_p = tmp; + } +#endif +} + +#ifndef CONFIG_SYS_I2C_DIRECT_BUS +/* + * i2c_mux_set() + * ------------- + * + * This turns on the given channel on I2C multiplexer chip connected to + * a given I2C adapter directly or via other multiplexers. In the latter + * case the entire multiplexer chain must be initialized first starting + * with the one connected directly to the adapter. When disabling a chain + * muxes must be programmed in reverse order, starting with the one + * farthest from the adapter. + * + * mux_id is the multiplexer chip type from defined in i2c.h. So far only + * NXP (Philips) PCA954x multiplexers are supported. Switches are NOT + * supported (anybody uses them?) + */ + +static int i2c_mux_set(struct i2c_adapter *adap, int mux_id, int chip, + int channel) +{ + uint8_t buf; + int ret; + + /* channel < 0 - turn off the mux */ + if (channel < 0) { + buf = 0; + ret = adap->write(adap, chip, 0, 0, &buf, 1); + if (ret) + printf("%s: Could not turn off the mux.\n", __func__); + return ret; + } + + switch (mux_id) { + case I2C_MUX_PCA9540_ID: + case I2C_MUX_PCA9542_ID: + if (channel > 1) + return -1; + buf = (uint8_t)((channel & 0x01) | (1 << 2)); + break; + case I2C_MUX_PCA9544_ID: + if (channel > 3) + return -1; + buf = (uint8_t)((channel & 0x03) | (1 << 2)); + break; + case I2C_MUX_PCA9547_ID: + if (channel > 7) + return -1; + buf = (uint8_t)((channel & 0x07) | (1 << 3)); + break; + default: + printf("%s: wrong mux id: %d\n", __func__, mux_id); + return -1; + } + + ret = adap->write(adap, chip, 0, 0, &buf, 1); + if (ret) + printf("%s: could not set mux: id: %d chip: %x channel: %d\n", + __func__, mux_id, chip, channel); + return ret; +} + +static int i2c_mux_set_all(void) +{ + struct i2c_bus_hose *i2c_bus_tmp = &i2c_bus[I2C_BUS]; + int i; + + /* Connect requested bus if behind muxes */ + if (i2c_bus_tmp->next_hop[0].chip != 0) { + /* Set all muxes along the path to that bus */ + for (i = 0; i < CONFIG_SYS_I2C_MAX_HOPS; i++) { + int ret; + + if (i2c_bus_tmp->next_hop[i].chip == 0) + break; + + ret = i2c_mux_set(I2C_ADAP, + i2c_bus_tmp->next_hop[i].mux.id, + i2c_bus_tmp->next_hop[i].chip, + i2c_bus_tmp->next_hop[i].channel); + if (ret != 0) + return ret; + } + } + return 0; +} + +static int i2c_mux_disconnet_all(void) +{ + struct i2c_bus_hose *i2c_bus_tmp = &i2c_bus[I2C_BUS]; + int i; + uint8_t buf; + + if (I2C_ADAP->init_done == 0) + return 0; + + /* Disconnect current bus (turn off muxes if any) */ + if ((i2c_bus_tmp->next_hop[0].chip != 0) && + (I2C_ADAP->init_done != 0)) { + i = CONFIG_SYS_I2C_MAX_HOPS; + do { + uint8_t chip; + int ret; + + chip = i2c_bus_tmp->next_hop[--i].chip; + if (chip == 0) + continue; + + ret = I2C_ADAP->write(I2C_ADAP, chip, 0, 0, &buf, 1); + if (ret != 0) { + printf("i2c: mux diconnect error\n"); + return ret; + } + } while (i > 0); + } + + return 0; +} +#endif + +/* + * i2c_init_bus(): + * --------------- + * + * Initializes one bus. Will initialize the parent adapter. No current bus + * changes, no mux (if any) setup. + */ +static void i2c_init_bus(unsigned int bus_no, int speed, int slaveaddr) +{ + if (bus_no >= CONFIG_SYS_NUM_I2C_BUSES) + return; + + I2C_ADAP->init(I2C_ADAP, speed, slaveaddr); + + if (gd->flags & GD_FLG_RELOC) { + I2C_ADAP->init_done = 1; + I2C_ADAP->speed = speed; + I2C_ADAP->slaveaddr = slaveaddr; + } +} + +/* implement possible board specific board init */ +static void __def_i2c_init_board(void) +{ +} +void i2c_init_board(void) + __attribute__((weak, alias("__def_i2c_init_board"))); + +/* + * i2c_init_all(): + * + * not longer needed, will deleted. Actual init the SPD_BUS + * for compatibility. + * i2c_adap[] must be initialized beforehead with function pointers and + * data, including speed and slaveaddr. + */ +void i2c_init_all(void) +{ + i2c_init_board(); + i2c_set_bus_num(CONFIG_SYS_SPD_BUS_NUM); + return; +} + +/* + * i2c_get_bus_num(): + * ------------------ + * + * Returns index of currently active I2C bus. Zero-based. + */ +unsigned int i2c_get_bus_num(void) +{ + return gd->cur_i2c_bus; +} + +/* + * i2c_set_bus_num(): + * ------------------ + * + * Change the active I2C bus. Subsequent read/write calls will + * go to this one. Sets all of the muxes in a proper condition + * if that bus is behind muxes. + * If previously selected bus is behind the muxes turns off all the + * muxes along the path to that bus. + * + * bus - bus index, zero based + * + * Returns: 0 on success, not 0 on failure + */ +int i2c_set_bus_num(unsigned int bus) +{ + int max = ll_entry_count(struct i2c_adapter, i2c); + + if (I2C_ADAPTER(bus) >= max) { + printf("Error, wrong i2c adapter %d max %d possible\n", + I2C_ADAPTER(bus), max); + return -2; + } +#ifndef CONFIG_SYS_I2C_DIRECT_BUS + if (bus >= CONFIG_SYS_NUM_I2C_BUSES) + return -1; +#endif + + if ((bus == I2C_BUS) && (I2C_ADAP->init_done > 0)) + return 0; + +#ifndef CONFIG_SYS_I2C_DIRECT_BUS + i2c_mux_disconnet_all(); +#endif + + gd->cur_i2c_bus = bus; + if (I2C_ADAP->init_done == 0) + i2c_init_bus(bus, I2C_ADAP->speed, I2C_ADAP->slaveaddr); + +#ifndef CONFIG_SYS_I2C_DIRECT_BUS + i2c_mux_set_all(); +#endif + return 0; +} + +/* + * Probe the given I2C chip address. Returns 0 if a chip responded, + * not 0 on failure. + */ +int i2c_probe(uint8_t chip) +{ + return I2C_ADAP->probe(I2C_ADAP, 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) +{ + return I2C_ADAP->read(I2C_ADAP, chip, addr, alen, buffer, len); +} + +int i2c_write(uint8_t chip, unsigned int addr, int alen, + uint8_t *buffer, int len) +{ + return I2C_ADAP->write(I2C_ADAP, chip, addr, alen, buffer, len); +} + +unsigned int i2c_set_bus_speed(unsigned int speed) +{ + unsigned int ret; + + if (I2C_ADAP->set_bus_speed == NULL) + return 0; + ret = I2C_ADAP->set_bus_speed(I2C_ADAP, speed); + if (gd->flags & GD_FLG_RELOC) + I2C_ADAP->speed = ret; + + return ret; +} + +unsigned int i2c_get_bus_speed(void) +{ + struct i2c_adapter *cur = I2C_ADAP; + return cur->speed; +} + +uint8_t i2c_reg_read(uint8_t addr, uint8_t reg) +{ + uint8_t buf; + +#ifdef CONFIG_8xx + /* MPC8xx needs this. Maybe one day we can get rid of it. */ + /* maybe it is now the time for it ... */ + i2c_set_bus_num(i2c_get_bus_num()); +#endif + i2c_read(addr, reg, 1, &buf, 1); + +#ifdef DEBUG + printf("%s: bus=%d addr=0x%02x, reg=0x%02x, val=0x%02x\n", + __func__, i2c_get_bus_num(), addr, reg, buf); +#endif + + return buf; +} + +void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val) +{ +#ifdef CONFIG_8xx + /* MPC8xx needs this. Maybe one day we can get rid of it. */ + /* maybe it is now the time for it ... */ + i2c_set_bus_num(i2c_get_bus_num()); +#endif + +#ifdef DEBUG + printf("%s: bus=%d addr=0x%02x, reg=0x%02x, val=0x%02x\n", + __func__, i2c_get_bus_num(), addr, reg, val); +#endif + + i2c_write(addr, reg, 1, &val, 1); +} + +void __i2c_init(int speed, int slaveaddr) +{ + i2c_init_bus(i2c_get_bus_num(), speed, slaveaddr); +} +void i2c_init(int speed, int slaveaddr) + __attribute__((weak, alias("__i2c_init"))); diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h index 8cfc3fa775..e08da90e4b 100644 --- a/include/asm-generic/global_data.h +++ b/include/asm-generic/global_data.h @@ -85,6 +85,9 @@ typedef struct global_data { #ifdef CONFIG_TRACE void *trace_buff; /* The trace buffer */ #endif +#if defined(CONFIG_SYS_I2C) + int cur_i2c_bus; /* current used i2c bus */ +#endif struct arch_global_data arch; /* architecture-specific data */ } gd_t; #endif diff --git a/include/i2c.h b/include/i2c.h index c60d07583b..457fd7d560 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -1,4 +1,8 @@ /* + * 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. * @@ -46,16 +50,14 @@ */ #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 */ @@ -69,6 +71,88 @@ #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); @@ -134,6 +218,104 @@ int i2x_mux_select_mux(int bus); int i2c_mux_ident_muxstring_f (uchar *buf); #endif +#ifdef CONFIG_SYS_I2C +/* + * Initialization, must be called once on start up, may be called + * repeatedly to change the speed and slave addresses. + */ +void i2c_init(unsigned int speed, int slaveaddr); +#ifdef CONFIG_SYS_I2C_INIT_BOARD +void i2c_init_board(void); +#endif + +/* + * 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); +#else + /* * Probe the given I2C chip address. Returns 0 if a chip responded, * not 0 on failure. @@ -235,6 +417,21 @@ int i2c_set_bus_speed(unsigned int); */ 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)); |
