i2c: add i2c_core and prepare for new multibus support
This Patch introduce the new i2c_core file, which holds the I2C core functions, for the rework of the multibus/ multiadapter support. Also adds changes in i2c.h for the new I2C multibus/multiadapter support. This new support can be activated with the CONFIG_SYS_I2C define. Signed-off-by: Heiko Schocher <hs@denx.de> Signed-off-by: Simon Glass <sjg@chromium.org> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Stephen Warren <swarren@wwwdotorg.org>utp
Heiko Schocher
parent
50ffc3b64a
commit
385c9ef5a7
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@ -46,6 +46,7 @@ COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
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COBJS-$(CONFIG_U8500_I2C) += u8500_i2c.o
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COBJS-$(CONFIG_SH_I2C) += sh_i2c.o
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COBJS-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o
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COBJS-$(CONFIG_SYS_I2C) += i2c_core.o
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COBJS-$(CONFIG_ZYNQ_I2C) += zynq_i2c.o
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COBJS := $(COBJS-y)
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@ -0,0 +1,414 @@
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/*
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* Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net>
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*
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* (C) Copyright 2012
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* Heiko Schocher, DENX Software Engineering, hs@denx.de.
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*
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* Multibus/multiadapter I2C core functions (wrappers)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <common.h>
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#include <i2c.h>
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struct i2c_adapter *i2c_get_adapter(int index)
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{
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struct i2c_adapter *i2c_adap_p = ll_entry_start(struct i2c_adapter,
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i2c);
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int max = ll_entry_count(struct i2c_adapter, i2c);
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int i;
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if (index >= max) {
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printf("Error, wrong i2c adapter %d max %d possible\n",
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index, max);
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return i2c_adap_p;
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}
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if (index == 0)
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return i2c_adap_p;
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for (i = 0; i < index; i++)
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i2c_adap_p++;
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return i2c_adap_p;
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}
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#if !defined(CONFIG_SYS_I2C_DIRECT_BUS)
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struct i2c_bus_hose i2c_bus[CONFIG_SYS_NUM_I2C_BUSES] =
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CONFIG_SYS_I2C_BUSES;
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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void i2c_reloc_fixup(void)
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{
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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struct i2c_adapter *i2c_adap_p = ll_entry_start(struct i2c_adapter,
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i2c);
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struct i2c_adapter *tmp = i2c_adap_p;
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int max = ll_entry_count(struct i2c_adapter, i2c);
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int i;
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unsigned long addr;
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if (gd->reloc_off == 0)
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return;
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for (i = 0; i < max; i++) {
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/* adapter itself */
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addr = (unsigned long)i2c_adap_p;
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addr += gd->reloc_off;
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i2c_adap_p = (struct i2c_adapter *)addr;
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/* i2c_init() */
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addr = (unsigned long)i2c_adap_p->init;
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addr += gd->reloc_off;
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i2c_adap_p->init = (void (*)(int, int))addr;
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/* i2c_probe() */
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addr = (unsigned long)i2c_adap_p->probe;
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addr += gd->reloc_off;
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i2c_adap_p->probe = (int (*)(uint8_t))addr;
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/* i2c_read() */
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addr = (unsigned long)i2c_adap_p->read;
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addr += gd->reloc_off;
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i2c_adap_p->read = (int (*)(uint8_t, uint, int, uint8_t *,
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int))addr;
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/* i2c_write() */
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addr = (unsigned long)i2c_adap_p->write;
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addr += gd->reloc_off;
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i2c_adap_p->write = (int (*)(uint8_t, uint, int, uint8_t *,
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int))addr;
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/* i2c_set_bus_speed() */
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addr = (unsigned long)i2c_adap_p->set_bus_speed;
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addr += gd->reloc_off;
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i2c_adap_p->set_bus_speed = (uint (*)(uint))addr;
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/* name */
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addr = (unsigned long)i2c_adap_p->name;
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addr += gd->reloc_off;
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i2c_adap_p->name = (char *)addr;
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tmp++;
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i2c_adap_p = tmp;
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}
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#endif
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}
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#ifndef CONFIG_SYS_I2C_DIRECT_BUS
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/*
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* i2c_mux_set()
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* -------------
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*
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* This turns on the given channel on I2C multiplexer chip connected to
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* a given I2C adapter directly or via other multiplexers. In the latter
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* case the entire multiplexer chain must be initialized first starting
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* with the one connected directly to the adapter. When disabling a chain
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* muxes must be programmed in reverse order, starting with the one
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* farthest from the adapter.
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*
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* mux_id is the multiplexer chip type from defined in i2c.h. So far only
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* NXP (Philips) PCA954x multiplexers are supported. Switches are NOT
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* supported (anybody uses them?)
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*/
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static int i2c_mux_set(struct i2c_adapter *adap, int mux_id, int chip,
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int channel)
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{
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uint8_t buf;
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int ret;
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/* channel < 0 - turn off the mux */
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if (channel < 0) {
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buf = 0;
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ret = adap->write(adap, chip, 0, 0, &buf, 1);
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if (ret)
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printf("%s: Could not turn off the mux.\n", __func__);
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return ret;
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}
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switch (mux_id) {
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case I2C_MUX_PCA9540_ID:
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case I2C_MUX_PCA9542_ID:
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if (channel > 1)
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return -1;
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buf = (uint8_t)((channel & 0x01) | (1 << 2));
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break;
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case I2C_MUX_PCA9544_ID:
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if (channel > 3)
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return -1;
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buf = (uint8_t)((channel & 0x03) | (1 << 2));
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break;
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case I2C_MUX_PCA9547_ID:
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if (channel > 7)
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return -1;
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buf = (uint8_t)((channel & 0x07) | (1 << 3));
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break;
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default:
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printf("%s: wrong mux id: %d\n", __func__, mux_id);
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return -1;
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}
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ret = adap->write(adap, chip, 0, 0, &buf, 1);
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if (ret)
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printf("%s: could not set mux: id: %d chip: %x channel: %d\n",
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__func__, mux_id, chip, channel);
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return ret;
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}
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static int i2c_mux_set_all(void)
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{
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struct i2c_bus_hose *i2c_bus_tmp = &i2c_bus[I2C_BUS];
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int i;
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/* Connect requested bus if behind muxes */
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if (i2c_bus_tmp->next_hop[0].chip != 0) {
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/* Set all muxes along the path to that bus */
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for (i = 0; i < CONFIG_SYS_I2C_MAX_HOPS; i++) {
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int ret;
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if (i2c_bus_tmp->next_hop[i].chip == 0)
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break;
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ret = i2c_mux_set(I2C_ADAP,
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i2c_bus_tmp->next_hop[i].mux.id,
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i2c_bus_tmp->next_hop[i].chip,
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i2c_bus_tmp->next_hop[i].channel);
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if (ret != 0)
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return ret;
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}
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}
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return 0;
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}
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static int i2c_mux_disconnet_all(void)
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{
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struct i2c_bus_hose *i2c_bus_tmp = &i2c_bus[I2C_BUS];
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int i;
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uint8_t buf;
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if (I2C_ADAP->init_done == 0)
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return 0;
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/* Disconnect current bus (turn off muxes if any) */
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if ((i2c_bus_tmp->next_hop[0].chip != 0) &&
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(I2C_ADAP->init_done != 0)) {
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i = CONFIG_SYS_I2C_MAX_HOPS;
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do {
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uint8_t chip;
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int ret;
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chip = i2c_bus_tmp->next_hop[--i].chip;
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if (chip == 0)
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continue;
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ret = I2C_ADAP->write(I2C_ADAP, chip, 0, 0, &buf, 1);
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if (ret != 0) {
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printf("i2c: mux diconnect error\n");
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return ret;
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}
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} while (i > 0);
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}
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return 0;
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}
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#endif
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/*
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* i2c_init_bus():
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* ---------------
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*
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* Initializes one bus. Will initialize the parent adapter. No current bus
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* changes, no mux (if any) setup.
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*/
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static void i2c_init_bus(unsigned int bus_no, int speed, int slaveaddr)
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{
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if (bus_no >= CONFIG_SYS_NUM_I2C_BUSES)
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return;
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I2C_ADAP->init(I2C_ADAP, speed, slaveaddr);
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if (gd->flags & GD_FLG_RELOC) {
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I2C_ADAP->init_done = 1;
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I2C_ADAP->speed = speed;
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I2C_ADAP->slaveaddr = slaveaddr;
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}
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}
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/* implement possible board specific board init */
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static void __def_i2c_init_board(void)
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{
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}
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void i2c_init_board(void)
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__attribute__((weak, alias("__def_i2c_init_board")));
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/*
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* i2c_init_all():
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*
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* not longer needed, will deleted. Actual init the SPD_BUS
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* for compatibility.
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* i2c_adap[] must be initialized beforehead with function pointers and
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* data, including speed and slaveaddr.
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*/
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void i2c_init_all(void)
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{
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i2c_init_board();
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i2c_set_bus_num(CONFIG_SYS_SPD_BUS_NUM);
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return;
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}
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/*
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* i2c_get_bus_num():
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* ------------------
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*
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* Returns index of currently active I2C bus. Zero-based.
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*/
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unsigned int i2c_get_bus_num(void)
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{
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return gd->cur_i2c_bus;
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}
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/*
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* i2c_set_bus_num():
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* ------------------
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*
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* Change the active I2C bus. Subsequent read/write calls will
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* go to this one. Sets all of the muxes in a proper condition
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* if that bus is behind muxes.
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* If previously selected bus is behind the muxes turns off all the
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* muxes along the path to that bus.
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*
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* bus - bus index, zero based
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*
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* Returns: 0 on success, not 0 on failure
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*/
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int i2c_set_bus_num(unsigned int bus)
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{
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int max = ll_entry_count(struct i2c_adapter, i2c);
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if (I2C_ADAPTER(bus) >= max) {
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printf("Error, wrong i2c adapter %d max %d possible\n",
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I2C_ADAPTER(bus), max);
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return -2;
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}
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#ifndef CONFIG_SYS_I2C_DIRECT_BUS
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if (bus >= CONFIG_SYS_NUM_I2C_BUSES)
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return -1;
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#endif
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if ((bus == I2C_BUS) && (I2C_ADAP->init_done > 0))
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return 0;
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#ifndef CONFIG_SYS_I2C_DIRECT_BUS
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i2c_mux_disconnet_all();
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#endif
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gd->cur_i2c_bus = bus;
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if (I2C_ADAP->init_done == 0)
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i2c_init_bus(bus, I2C_ADAP->speed, I2C_ADAP->slaveaddr);
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#ifndef CONFIG_SYS_I2C_DIRECT_BUS
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i2c_mux_set_all();
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#endif
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return 0;
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}
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/*
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* Probe the given I2C chip address. Returns 0 if a chip responded,
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* not 0 on failure.
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*/
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int i2c_probe(uint8_t chip)
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{
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return I2C_ADAP->probe(I2C_ADAP, chip);
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}
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/*
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* Read/Write interface:
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* chip: I2C chip address, range 0..127
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* addr: Memory (register) address within the chip
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* alen: Number of bytes to use for addr (typically 1, 2 for larger
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* memories, 0 for register type devices with only one
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* register)
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* buffer: Where to read/write the data
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* len: How many bytes to read/write
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*
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* Returns: 0 on success, not 0 on failure
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*/
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int i2c_read(uint8_t chip, unsigned int addr, int alen,
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uint8_t *buffer, int len)
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{
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return I2C_ADAP->read(I2C_ADAP, chip, addr, alen, buffer, len);
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}
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int i2c_write(uint8_t chip, unsigned int addr, int alen,
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uint8_t *buffer, int len)
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{
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return I2C_ADAP->write(I2C_ADAP, chip, addr, alen, buffer, len);
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}
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unsigned int i2c_set_bus_speed(unsigned int speed)
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{
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unsigned int ret;
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if (I2C_ADAP->set_bus_speed == NULL)
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return 0;
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ret = I2C_ADAP->set_bus_speed(I2C_ADAP, speed);
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if (gd->flags & GD_FLG_RELOC)
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I2C_ADAP->speed = ret;
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return ret;
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}
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unsigned int i2c_get_bus_speed(void)
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{
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struct i2c_adapter *cur = I2C_ADAP;
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return cur->speed;
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}
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uint8_t i2c_reg_read(uint8_t addr, uint8_t reg)
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{
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uint8_t buf;
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#ifdef CONFIG_8xx
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/* MPC8xx needs this. Maybe one day we can get rid of it. */
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/* maybe it is now the time for it ... */
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i2c_set_bus_num(i2c_get_bus_num());
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#endif
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i2c_read(addr, reg, 1, &buf, 1);
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#ifdef DEBUG
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printf("%s: bus=%d addr=0x%02x, reg=0x%02x, val=0x%02x\n",
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__func__, i2c_get_bus_num(), addr, reg, buf);
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#endif
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return buf;
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}
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void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val)
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{
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#ifdef CONFIG_8xx
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/* MPC8xx needs this. Maybe one day we can get rid of it. */
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/* maybe it is now the time for it ... */
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i2c_set_bus_num(i2c_get_bus_num());
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#endif
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#ifdef DEBUG
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printf("%s: bus=%d addr=0x%02x, reg=0x%02x, val=0x%02x\n",
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__func__, i2c_get_bus_num(), addr, reg, val);
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#endif
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i2c_write(addr, reg, 1, &val, 1);
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}
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void __i2c_init(int speed, int slaveaddr)
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{
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i2c_init_bus(i2c_get_bus_num(), speed, slaveaddr);
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}
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void i2c_init(int speed, int slaveaddr)
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__attribute__((weak, alias("__i2c_init")));
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@ -84,6 +84,9 @@ typedef struct global_data {
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char env_buf[32]; /* buffer for getenv() before reloc. */
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#ifdef CONFIG_TRACE
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void *trace_buff; /* The trace buffer */
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#endif
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#if defined(CONFIG_SYS_I2C)
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int cur_i2c_bus; /* current used i2c bus */
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#endif
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struct arch_global_data arch; /* architecture-specific data */
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} gd_t;
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215
include/i2c.h
215
include/i2c.h
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@ -1,4 +1,8 @@
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/*
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* Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net>
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* Copyright (C) 2009 - 2013 Heiko Schocher <hs@denx.de>
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* Changes for multibus/multiadapter I2C support.
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*
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* (C) Copyright 2001
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* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
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*
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@ -46,16 +50,14 @@
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*/
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#define I2C_RXTX_LEN 128 /* maximum tx/rx buffer length */
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#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));
|
||||
|
|
|
|||
Loading…
Reference in New Issue