upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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210 lines
4.4 KiB
210 lines
4.4 KiB
16 years ago
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/*
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* (C) Copyright 2008
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* Heiko Schocher, DENX Software Engineering, hs@denx.de.
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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 <mpc8260.h>
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#include <ioports.h>
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#include <malloc.h>
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#if defined(CONFIG_OF_BOARD_SETUP) && defined(CONFIG_OF_LIBFDT)
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#include <libfdt.h>
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#endif
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#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
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#include <i2c.h>
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#endif
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extern int i2c_soft_read_pin (void);
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#if defined(CFG_I2C_INIT_BOARD)
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#define DELAY_ABORT_SEQ 62
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#define DELAY_HALF_PERIOD (500 / (CFG_I2C_SPEED / 1000))
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#if defined(CONFIG_MGCOGE)
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#define SDA_MASK 0x00010000
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#define SCL_MASK 0x00020000
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static void set_pin (int state, unsigned long mask)
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{
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volatile ioport_t *iop = ioport_addr ((immap_t *)CFG_IMMR, 3);
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if (state)
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iop->pdat |= (mask);
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else
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iop->pdat &= ~(mask);
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iop->pdir |= (mask);
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}
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static int get_pin (unsigned long mask)
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{
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volatile ioport_t *iop = ioport_addr ((immap_t *)CFG_IMMR, 3);
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iop->pdir &= ~(mask);
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return (0 != (iop->pdat & (mask)));
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}
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static void set_sda (int state)
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{
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set_pin (state, SDA_MASK);
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}
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static void set_scl (int state)
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{
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set_pin (state, SCL_MASK);
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}
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static int get_sda (void)
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{
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return get_pin (SDA_MASK);
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}
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static int get_scl (void)
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{
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return get_pin (SCL_MASK);
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}
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#if defined(CONFIG_HARD_I2C)
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static void setports (int gpio)
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{
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volatile ioport_t *iop = ioport_addr ((immap_t *)CFG_IMMR, 3);
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if (gpio) {
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iop->ppar &= ~(SDA_MASK | SCL_MASK);
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iop->podr &= ~(SDA_MASK | SCL_MASK);
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} else {
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iop->ppar |= (SDA_MASK | SCL_MASK);
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iop->pdir &= ~(SDA_MASK | SCL_MASK);
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iop->podr |= (SDA_MASK | SCL_MASK);
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}
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}
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#endif
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#endif
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#if defined(CONFIG_MGSUVD)
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static void set_sda (int state)
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{
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I2C_SDA(state);
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}
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static void set_scl (int state)
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{
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I2C_SCL(state);
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}
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static int get_sda (void)
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{
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return i2c_soft_read_pin ();
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}
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static int get_scl (void)
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{
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int val;
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*(unsigned short *)(I2C_BASE_DIR) &= ~SCL_CONF;
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udelay (1);
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val = *(unsigned char *)(I2C_BASE_PORT);
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return ((val & SCL_BIT) == SCL_BIT);
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}
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#endif
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static void writeStartSeq (void)
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{
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set_sda (1);
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udelay (DELAY_HALF_PERIOD);
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set_scl (1);
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udelay (DELAY_HALF_PERIOD);
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set_sda (0);
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udelay (DELAY_HALF_PERIOD);
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set_scl (0);
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udelay (DELAY_HALF_PERIOD);
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}
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/* I2C is a synchronous protocol and resets of the processor in the middle
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of an access can block the I2C Bus until a powerdown of the full unit is
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done. This function toggles the SCL until the SCL and SCA line are
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released, but max. 16 times, after this a I2C start-sequence is sent.
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This I2C Deblocking mechanism was developed by Keymile in association
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with Anatech and Atmel in 1998.
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*/
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static int i2c_make_abort (void)
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{
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int scl_state = 0;
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int sda_state = 0;
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int i = 0;
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int ret = 0;
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if (!get_sda ()) {
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ret = -1;
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while (i < 16) {
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i++;
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set_scl (0);
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udelay (DELAY_ABORT_SEQ);
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set_scl (1);
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udelay (DELAY_ABORT_SEQ);
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scl_state = get_scl ();
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sda_state = get_sda ();
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if (scl_state && sda_state) {
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ret = 0;
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break;
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}
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}
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}
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if (ret == 0) {
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for (i =0; i < 5; i++) {
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writeStartSeq ();
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}
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}
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get_sda ();
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return ret;
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}
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/**
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* i2c_init_board - reset i2c bus. When the board is powercycled during a
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* bus transfer it might hang; for details see doc/I2C_Edge_Conditions.
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*/
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void i2c_init_board(void)
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{
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#if defined(CONFIG_HARD_I2C)
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volatile immap_t *immap = (immap_t *)CFG_IMMR ;
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volatile i2c8260_t *i2c = (i2c8260_t *)&immap->im_i2c;
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/* disable I2C controller first, otherwhise it thinks we want to */
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/* talk to the slave port... */
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i2c->i2c_i2mod &= ~0x01;
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/* Set the PortPins to GPIO */
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setports (1);
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#endif
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/* Now run the AbortSequence() */
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i2c_make_abort ();
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#if defined(CONFIG_HARD_I2C)
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/* Set the PortPins back to use for I2C */
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setports (0);
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#endif
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}
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#endif
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