* 'master' of git://git.denx.de/u-boot-i2c: km/common: remove printfs for i2c deblocking code CONFIG: SMDK5250: I2C: Enable I2C I2C: Add support for Multi channel I2C: Modify the I2C driver for EXYNOS5 I2C: Move struct s3c24x0_i2c to a common place. EXYNOS: PINMUX: Add pinmux support for I2C EXYNOS5: define EXYNOS5_I2C_SPACING EXYNOS: Add I2C base address. EXYNOS: CLK: Add i2c clock mx6qsabrelite: add i2c multi-bus support imx-common: add i2c.c for bus recovery support i.mx53: add definition for I2C3_BASE_ADDR i.mx: iomux-v3.c: move to imx-common directory i.mx: iomux-v3.h: move to imx-common include directory iomux-v3: remove include of mx6x_pins.h mxc_i2c: finish adding CONFIG_I2C_MULTI_BUS support mxc_i2c: add bus recovery support mxc_i2c: prep work for multiple busses support mxc_i2c: add i2c_regs argument to i2c_imx_stop mxc_i2c: add retries mxc_i2c: check for arbitration lost mxc_i2c: change slave addr if conflicts with destination. mxc_i2c: don't disable controller after every transaction mxc_i2c: place i2c_reset code inline mxc_i2c: place imx_start code inline mxc_i2c: remove redundant read mxc_i2c: combine i2c_imx_bus_busy and i2c_imx_trx_complete into wait_for_sr_state mxc_i2c.c: code i2c_probe as a 0 length i2c_write mxc_i2c: call i2c_imx_stop on error in i2c_read/i2c_write mxc_i2c: create i2c_init_transfer mxc_i2c: clear i2sr before waiting for bit mxc_i2c: create tx_byte function mxc_i2c: remove ifdef of CONFIG_HARD_I2C mxc_i2c: fix i2c_imx_stop i2c: deblock i2c bus also if accessed before realocation Signed-off-by: Wolfgang Denk <wd@denx.de>master
Wolfgang Denk
13 years ago
commit
948fa1713c
@ -0,0 +1,99 @@ |
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/*
|
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* Copyright (C) 2012 Boundary Devices Inc. |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (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., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#include <common.h> |
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#include <asm/arch/clock.h> |
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#include <asm/arch/imx-regs.h> |
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#include <asm/errno.h> |
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#include <asm/gpio.h> |
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#include <asm/imx-common/mxc_i2c.h> |
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#include <watchdog.h> |
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|
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static int force_idle_bus(void *priv) |
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{ |
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int i; |
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int sda, scl; |
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ulong elapsed, start_time; |
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struct i2c_pads_info *p = (struct i2c_pads_info *)priv; |
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int ret = 0; |
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gpio_direction_input(p->sda.gp); |
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gpio_direction_input(p->scl.gp); |
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imx_iomux_v3_setup_pad(p->sda.gpio_mode); |
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imx_iomux_v3_setup_pad(p->scl.gpio_mode); |
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sda = gpio_get_value(p->sda.gp); |
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scl = gpio_get_value(p->scl.gp); |
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if ((sda & scl) == 1) |
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goto exit; /* Bus is idle already */ |
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printf("%s: sda=%d scl=%d sda.gp=0x%x scl.gp=0x%x\n", __func__, |
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sda, scl, p->sda.gp, p->scl.gp); |
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/* Send high and low on the SCL line */ |
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for (i = 0; i < 9; i++) { |
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gpio_direction_output(p->scl.gp, 0); |
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udelay(50); |
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gpio_direction_input(p->scl.gp); |
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udelay(50); |
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} |
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start_time = get_timer(0); |
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for (;;) { |
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sda = gpio_get_value(p->sda.gp); |
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scl = gpio_get_value(p->scl.gp); |
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if ((sda & scl) == 1) |
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break; |
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WATCHDOG_RESET(); |
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elapsed = get_timer(start_time); |
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if (elapsed > (CONFIG_SYS_HZ / 5)) { /* .2 seconds */ |
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ret = -EBUSY; |
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printf("%s: failed to clear bus, sda=%d scl=%d\n", |
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__func__, sda, scl); |
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break; |
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} |
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} |
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exit: |
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imx_iomux_v3_setup_pad(p->sda.i2c_mode); |
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imx_iomux_v3_setup_pad(p->scl.i2c_mode); |
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return ret; |
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} |
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static void * const i2c_bases[] = { |
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(void *)I2C1_BASE_ADDR, |
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(void *)I2C2_BASE_ADDR, |
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#ifdef I2C3_BASE_ADDR |
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(void *)I2C3_BASE_ADDR, |
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#endif |
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}; |
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|
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/* i2c_index can be from 0 - 2 */ |
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void setup_i2c(unsigned i2c_index, int speed, int slave_addr, |
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struct i2c_pads_info *p) |
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{ |
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if (i2c_index >= ARRAY_SIZE(i2c_bases)) |
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return; |
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/* Enable i2c clock */ |
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enable_i2c_clk(1, i2c_index); |
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/* Make sure bus is idle */ |
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force_idle_bus(p); |
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bus_i2c_init(i2c_bases[i2c_index], speed, slave_addr, |
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force_idle_bus, p); |
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} |
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@ -0,0 +1,42 @@ |
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/*
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* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved. |
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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 along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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*/ |
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#ifndef __ASM_ARCH_MXC_MXC_I2C_H__ |
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#define __ASM_ARCH_MXC_MXC_I2C_H__ |
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#include <asm/imx-common/iomux-v3.h> |
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struct i2c_pin_ctrl { |
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iomux_v3_cfg_t i2c_mode; |
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iomux_v3_cfg_t gpio_mode; |
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unsigned char gp; |
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unsigned char spare; |
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}; |
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struct i2c_pads_info { |
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struct i2c_pin_ctrl scl; |
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struct i2c_pin_ctrl sda; |
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}; |
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void setup_i2c(unsigned i2c_index, int speed, int slave_addr, |
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struct i2c_pads_info *p); |
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void bus_i2c_init(void *base, int speed, int slave_addr, |
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int (*idle_bus_fn)(void *p), void *p); |
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int bus_i2c_read(void *base, uchar chip, uint addr, int alen, uchar *buf, |
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int len); |
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int bus_i2c_write(void *base, uchar chip, uint addr, int alen, |
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const uchar *buf, int len); |
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#endif |
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@ -0,0 +1,33 @@ |
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/*
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* Copyright (C) 2012 Samsung Electronics |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (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., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#ifndef _S3C24X0_I2C_H |
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#define _S3C24X0_I2C_H |
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struct s3c24x0_i2c { |
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u32 iiccon; |
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u32 iicstat; |
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u32 iicadd; |
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u32 iicds; |
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u32 iiclc; |
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}; |
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#endif /* _S3C24X0_I2C_H */ |
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