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https://github.com/AsahiLinux/u-boot
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960187ffa1
New i2c_read, i2c_write and i2c_probe functions, tested on OMAP4 (4430/60/70), OMAP5 (5430) and AM335X (3359); should work on older OMAPs and derivatives as well. The only anticipated exception would be the OMAP2420, which shall require driver modification. - Rewritten i2c_read to operate correctly with all types of chips (old function could not read consistent data from some I2C slaves). - Optimised i2c_write. - New i2c_probe, performs write access vs read. The old probe could hang the system under certain conditions (e.g. unconfigured pads). - The read/write/probe functions try to identify unconfigured bus. - Status functions now read irqstatus_raw as per TRM guidelines (except for OMAP243X and OMAP34XX). - Driver now supports up to I2C5 (OMAP5). Signed-off-by: Lubomir Popov <lpopov@mm-sol.com> Tested-by: Heiko Schocher <hs@denx.de>
595 lines
15 KiB
C
595 lines
15 KiB
C
/*
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* Basic I2C functions
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*
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* Copyright (c) 2004 Texas Instruments
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*
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* This package is free software; you can redistribute it and/or
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* modify it under the terms of the license found in the file
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* named COPYING that should have accompanied this file.
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*
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* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Author: Jian Zhang jzhang@ti.com, Texas Instruments
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*
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* Copyright (c) 2003 Wolfgang Denk, wd@denx.de
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* Rewritten to fit into the current U-Boot framework
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*
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* Adapted for OMAP2420 I2C, r-woodruff2@ti.com
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*
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* Copyright (c) 2013 Lubomir Popov <lpopov@mm-sol.com>, MM Solutions
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* New i2c_read, i2c_write and i2c_probe functions, tested on OMAP4
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* (4430/60/70), OMAP5 (5430) and AM335X (3359); should work on older
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* OMAPs and derivatives as well. The only anticipated exception would
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* be the OMAP2420, which shall require driver modification.
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* - Rewritten i2c_read to operate correctly with all types of chips
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* (old function could not read consistent data from some I2C slaves).
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* - Optimized i2c_write.
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* - New i2c_probe, performs write access vs read. The old probe could
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* hang the system under certain conditions (e.g. unconfigured pads).
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* - The read/write/probe functions try to identify unconfigured bus.
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* - Status functions now read irqstatus_raw as per TRM guidelines
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* (except for OMAP243X and OMAP34XX).
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* - Driver now supports up to I2C5 (OMAP5).
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*/
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#include <common.h>
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#include <asm/arch/i2c.h>
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#include <asm/io.h>
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#include "omap24xx_i2c.h"
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DECLARE_GLOBAL_DATA_PTR;
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#define I2C_TIMEOUT 1000
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/* Absolutely safe for status update at 100 kHz I2C: */
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#define I2C_WAIT 200
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static int wait_for_bb(void);
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static u16 wait_for_event(void);
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static void flush_fifo(void);
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/*
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* For SPL boot some boards need i2c before SDRAM is initialised so force
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* variables to live in SRAM
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*/
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static struct i2c __attribute__((section (".data"))) *i2c_base =
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(struct i2c *)I2C_DEFAULT_BASE;
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static unsigned int __attribute__((section (".data"))) bus_initialized[I2C_BUS_MAX] =
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{ [0 ... (I2C_BUS_MAX-1)] = 0 };
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static unsigned int __attribute__((section (".data"))) current_bus = 0;
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void i2c_init(int speed, int slaveadd)
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{
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int psc, fsscll, fssclh;
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int hsscll = 0, hssclh = 0;
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u32 scll, sclh;
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int timeout = I2C_TIMEOUT;
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/* Only handle standard, fast and high speeds */
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if ((speed != OMAP_I2C_STANDARD) &&
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(speed != OMAP_I2C_FAST_MODE) &&
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(speed != OMAP_I2C_HIGH_SPEED)) {
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printf("Error : I2C unsupported speed %d\n", speed);
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return;
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}
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psc = I2C_IP_CLK / I2C_INTERNAL_SAMPLING_CLK;
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psc -= 1;
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if (psc < I2C_PSC_MIN) {
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printf("Error : I2C unsupported prescalar %d\n", psc);
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return;
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}
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if (speed == OMAP_I2C_HIGH_SPEED) {
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/* High speed */
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/* For first phase of HS mode */
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fsscll = fssclh = I2C_INTERNAL_SAMPLING_CLK /
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(2 * OMAP_I2C_FAST_MODE);
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fsscll -= I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM;
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fssclh -= I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM;
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if (((fsscll < 0) || (fssclh < 0)) ||
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((fsscll > 255) || (fssclh > 255))) {
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puts("Error : I2C initializing first phase clock\n");
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return;
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}
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/* For second phase of HS mode */
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hsscll = hssclh = I2C_INTERNAL_SAMPLING_CLK / (2 * speed);
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hsscll -= I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM;
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hssclh -= I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM;
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if (((fsscll < 0) || (fssclh < 0)) ||
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((fsscll > 255) || (fssclh > 255))) {
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puts("Error : I2C initializing second phase clock\n");
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return;
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}
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scll = (unsigned int)hsscll << 8 | (unsigned int)fsscll;
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sclh = (unsigned int)hssclh << 8 | (unsigned int)fssclh;
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} else {
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/* Standard and fast speed */
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fsscll = fssclh = I2C_INTERNAL_SAMPLING_CLK / (2 * speed);
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fsscll -= I2C_FASTSPEED_SCLL_TRIM;
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fssclh -= I2C_FASTSPEED_SCLH_TRIM;
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if (((fsscll < 0) || (fssclh < 0)) ||
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((fsscll > 255) || (fssclh > 255))) {
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puts("Error : I2C initializing clock\n");
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return;
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}
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scll = (unsigned int)fsscll;
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sclh = (unsigned int)fssclh;
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}
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if (readw(&i2c_base->con) & I2C_CON_EN) {
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writew(0, &i2c_base->con);
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udelay(50000);
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}
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writew(0x2, &i2c_base->sysc); /* for ES2 after soft reset */
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udelay(1000);
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writew(I2C_CON_EN, &i2c_base->con);
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while (!(readw(&i2c_base->syss) & I2C_SYSS_RDONE) && timeout--) {
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if (timeout <= 0) {
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puts("ERROR: Timeout in soft-reset\n");
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return;
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}
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udelay(1000);
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}
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writew(0, &i2c_base->con);
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writew(psc, &i2c_base->psc);
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writew(scll, &i2c_base->scll);
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writew(sclh, &i2c_base->sclh);
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/* own address */
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writew(slaveadd, &i2c_base->oa);
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writew(I2C_CON_EN, &i2c_base->con);
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#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
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/*
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* Have to enable interrupts for OMAP2/3, these IPs don't have
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* an 'irqstatus_raw' register and we shall have to poll 'stat'
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*/
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writew(I2C_IE_XRDY_IE | I2C_IE_RRDY_IE | I2C_IE_ARDY_IE |
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I2C_IE_NACK_IE | I2C_IE_AL_IE, &i2c_base->ie);
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#endif
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udelay(1000);
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flush_fifo();
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writew(0xFFFF, &i2c_base->stat);
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writew(0, &i2c_base->cnt);
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if (gd->flags & GD_FLG_RELOC)
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bus_initialized[current_bus] = 1;
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}
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static void flush_fifo(void)
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{ u16 stat;
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/* note: if you try and read data when its not there or ready
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* you get a bus error
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*/
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while (1) {
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stat = readw(&i2c_base->stat);
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if (stat == I2C_STAT_RRDY) {
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readb(&i2c_base->data);
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writew(I2C_STAT_RRDY, &i2c_base->stat);
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udelay(1000);
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} else
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break;
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}
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}
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/*
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* i2c_probe: Use write access. Allows to identify addresses that are
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* write-only (like the config register of dual-port EEPROMs)
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*/
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int i2c_probe(uchar chip)
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{
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u16 status;
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int res = 1; /* default = fail */
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if (chip == readw(&i2c_base->oa))
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return res;
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/* Wait until bus is free */
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if (wait_for_bb())
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return res;
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/* No data transfer, slave addr only */
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writew(0, &i2c_base->cnt);
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/* Set slave address */
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writew(chip, &i2c_base->sa);
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/* Stop bit needed here */
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writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX |
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I2C_CON_STP, &i2c_base->con);
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status = wait_for_event();
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if ((status & ~I2C_STAT_XRDY) == 0 || (status & I2C_STAT_AL)) {
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/*
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* With current high-level command implementation, notifying
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* the user shall flood the console with 127 messages. If
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* silent exit is desired upon unconfigured bus, remove the
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* following 'if' section:
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*/
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if (status == I2C_STAT_XRDY)
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printf("i2c_probe: pads on bus %d probably not configured (status=0x%x)\n",
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current_bus, status);
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goto pr_exit;
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}
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/* Check for ACK (!NAK) */
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if (!(status & I2C_STAT_NACK)) {
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res = 0; /* Device found */
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udelay(I2C_WAIT); /* Required by AM335X in SPL */
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/* Abort transfer (force idle state) */
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writew(I2C_CON_MST | I2C_CON_TRX, &i2c_base->con); /* Reset */
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udelay(1000);
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writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_TRX |
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I2C_CON_STP, &i2c_base->con); /* STP */
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}
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pr_exit:
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flush_fifo();
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writew(0xFFFF, &i2c_base->stat);
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writew(0, &i2c_base->cnt);
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return res;
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}
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/*
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* i2c_read: Function now uses a single I2C read transaction with bulk transfer
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* of the requested number of bytes (note that the 'i2c md' command
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* limits this to 16 bytes anyway). If CONFIG_I2C_REPEATED_START is
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* defined in the board config header, this transaction shall be with
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* Repeated Start (Sr) between the address and data phases; otherwise
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* Stop-Start (P-S) shall be used (some I2C chips do require a P-S).
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* The address (reg offset) may be 0, 1 or 2 bytes long.
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* Function now reads correctly from chips that return more than one
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* byte of data per addressed register (like TI temperature sensors),
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* or that do not need a register address at all (such as some clock
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* distributors).
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*/
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int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
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{
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int i2c_error = 0;
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u16 status;
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if (alen < 0) {
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puts("I2C read: addr len < 0\n");
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return 1;
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}
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if (len < 0) {
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puts("I2C read: data len < 0\n");
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return 1;
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}
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if (buffer == NULL) {
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puts("I2C read: NULL pointer passed\n");
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return 1;
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}
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if (alen > 2) {
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printf("I2C read: addr len %d not supported\n", alen);
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return 1;
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}
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if (addr + len > (1 << 16)) {
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puts("I2C read: address out of range\n");
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return 1;
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}
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/* Wait until bus not busy */
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if (wait_for_bb())
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return 1;
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/* Zero, one or two bytes reg address (offset) */
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writew(alen, &i2c_base->cnt);
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/* Set slave address */
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writew(chip, &i2c_base->sa);
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if (alen) {
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/* Must write reg offset first */
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#ifdef CONFIG_I2C_REPEATED_START
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/* No stop bit, use Repeated Start (Sr) */
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writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT |
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I2C_CON_TRX, &i2c_base->con);
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#else
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/* Stop - Start (P-S) */
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writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP |
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I2C_CON_TRX, &i2c_base->con);
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#endif
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/* Send register offset */
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while (1) {
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status = wait_for_event();
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/* Try to identify bus that is not padconf'd for I2C */
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if (status == I2C_STAT_XRDY) {
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i2c_error = 2;
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printf("i2c_read (addr phase): pads on bus %d probably not configured (status=0x%x)\n",
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current_bus, status);
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goto rd_exit;
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}
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if (status == 0 || status & I2C_STAT_NACK) {
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i2c_error = 1;
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printf("i2c_read: error waiting for addr ACK (status=0x%x)\n",
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status);
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goto rd_exit;
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}
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if (alen) {
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if (status & I2C_STAT_XRDY) {
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alen--;
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/* Do we have to use byte access? */
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writeb((addr >> (8 * alen)) & 0xff,
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&i2c_base->data);
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writew(I2C_STAT_XRDY, &i2c_base->stat);
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}
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}
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if (status & I2C_STAT_ARDY) {
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writew(I2C_STAT_ARDY, &i2c_base->stat);
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break;
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}
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}
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}
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/* Set slave address */
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writew(chip, &i2c_base->sa);
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/* Read len bytes from slave */
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writew(len, &i2c_base->cnt);
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/* Need stop bit here */
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writew(I2C_CON_EN | I2C_CON_MST |
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I2C_CON_STT | I2C_CON_STP,
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&i2c_base->con);
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/* Receive data */
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while (1) {
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status = wait_for_event();
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/*
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* Try to identify bus that is not padconf'd for I2C. This
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* state could be left over from previous transactions if
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* the address phase is skipped due to alen=0.
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*/
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if (status == I2C_STAT_XRDY) {
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i2c_error = 2;
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printf("i2c_read (data phase): pads on bus %d probably not configured (status=0x%x)\n",
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current_bus, status);
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goto rd_exit;
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}
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if (status == 0 || status & I2C_STAT_NACK) {
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i2c_error = 1;
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goto rd_exit;
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}
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if (status & I2C_STAT_RRDY) {
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*buffer++ = readb(&i2c_base->data);
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writew(I2C_STAT_RRDY, &i2c_base->stat);
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}
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if (status & I2C_STAT_ARDY) {
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writew(I2C_STAT_ARDY, &i2c_base->stat);
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break;
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}
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}
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rd_exit:
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flush_fifo();
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writew(0xFFFF, &i2c_base->stat);
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writew(0, &i2c_base->cnt);
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return i2c_error;
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}
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/* i2c_write: Address (reg offset) may be 0, 1 or 2 bytes long. */
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int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
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{
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int i;
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u16 status;
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int i2c_error = 0;
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if (alen < 0) {
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puts("I2C write: addr len < 0\n");
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return 1;
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}
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if (len < 0) {
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puts("I2C write: data len < 0\n");
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return 1;
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}
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if (buffer == NULL) {
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puts("I2C write: NULL pointer passed\n");
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return 1;
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}
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if (alen > 2) {
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printf("I2C write: addr len %d not supported\n", alen);
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return 1;
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}
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if (addr + len > (1 << 16)) {
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printf("I2C write: address 0x%x + 0x%x out of range\n",
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addr, len);
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return 1;
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}
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/* Wait until bus not busy */
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if (wait_for_bb())
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return 1;
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/* Start address phase - will write regoffset + len bytes data */
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writew(alen + len, &i2c_base->cnt);
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/* Set slave address */
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writew(chip, &i2c_base->sa);
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/* Stop bit needed here */
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writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX |
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I2C_CON_STP, &i2c_base->con);
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while (alen) {
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/* Must write reg offset (one or two bytes) */
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status = wait_for_event();
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/* Try to identify bus that is not padconf'd for I2C */
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if (status == I2C_STAT_XRDY) {
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i2c_error = 2;
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printf("i2c_write: pads on bus %d probably not configured (status=0x%x)\n",
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current_bus, status);
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goto wr_exit;
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}
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if (status == 0 || status & I2C_STAT_NACK) {
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i2c_error = 1;
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printf("i2c_write: error waiting for addr ACK (status=0x%x)\n",
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status);
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goto wr_exit;
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}
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if (status & I2C_STAT_XRDY) {
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alen--;
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writeb((addr >> (8 * alen)) & 0xff, &i2c_base->data);
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writew(I2C_STAT_XRDY, &i2c_base->stat);
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} else {
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i2c_error = 1;
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printf("i2c_write: bus not ready for addr Tx (status=0x%x)\n",
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status);
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goto wr_exit;
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}
|
|
}
|
|
/* Address phase is over, now write data */
|
|
for (i = 0; i < len; i++) {
|
|
status = wait_for_event();
|
|
if (status == 0 || status & I2C_STAT_NACK) {
|
|
i2c_error = 1;
|
|
printf("i2c_write: error waiting for data ACK (status=0x%x)\n",
|
|
status);
|
|
goto wr_exit;
|
|
}
|
|
if (status & I2C_STAT_XRDY) {
|
|
writeb(buffer[i], &i2c_base->data);
|
|
writew(I2C_STAT_XRDY, &i2c_base->stat);
|
|
} else {
|
|
i2c_error = 1;
|
|
printf("i2c_write: bus not ready for data Tx (i=%d)\n",
|
|
i);
|
|
goto wr_exit;
|
|
}
|
|
}
|
|
|
|
wr_exit:
|
|
flush_fifo();
|
|
writew(0xFFFF, &i2c_base->stat);
|
|
writew(0, &i2c_base->cnt);
|
|
return i2c_error;
|
|
}
|
|
|
|
/*
|
|
* Wait for the bus to be free by checking the Bus Busy (BB)
|
|
* bit to become clear
|
|
*/
|
|
static int wait_for_bb(void)
|
|
{
|
|
int timeout = I2C_TIMEOUT;
|
|
u16 stat;
|
|
|
|
writew(0xFFFF, &i2c_base->stat); /* clear current interrupts...*/
|
|
#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
|
|
while ((stat = readw(&i2c_base->stat) & I2C_STAT_BB) && timeout--) {
|
|
#else
|
|
/* Read RAW status */
|
|
while ((stat = readw(&i2c_base->irqstatus_raw) &
|
|
I2C_STAT_BB) && timeout--) {
|
|
#endif
|
|
writew(stat, &i2c_base->stat);
|
|
udelay(I2C_WAIT);
|
|
}
|
|
|
|
if (timeout <= 0) {
|
|
printf("Timed out in wait_for_bb: status=%04x\n",
|
|
stat);
|
|
return 1;
|
|
}
|
|
writew(0xFFFF, &i2c_base->stat); /* clear delayed stuff*/
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Wait for the I2C controller to complete current action
|
|
* and update status
|
|
*/
|
|
static u16 wait_for_event(void)
|
|
{
|
|
u16 status;
|
|
int timeout = I2C_TIMEOUT;
|
|
|
|
do {
|
|
udelay(I2C_WAIT);
|
|
#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
|
|
status = readw(&i2c_base->stat);
|
|
#else
|
|
/* Read RAW status */
|
|
status = readw(&i2c_base->irqstatus_raw);
|
|
#endif
|
|
} while (!(status &
|
|
(I2C_STAT_ROVR | I2C_STAT_XUDF | I2C_STAT_XRDY |
|
|
I2C_STAT_RRDY | I2C_STAT_ARDY | I2C_STAT_NACK |
|
|
I2C_STAT_AL)) && timeout--);
|
|
|
|
if (timeout <= 0) {
|
|
printf("Timed out in wait_for_event: status=%04x\n",
|
|
status);
|
|
/*
|
|
* If status is still 0 here, probably the bus pads have
|
|
* not been configured for I2C, and/or pull-ups are missing.
|
|
*/
|
|
printf("Check if pads/pull-ups of bus %d are properly configured\n",
|
|
current_bus);
|
|
writew(0xFFFF, &i2c_base->stat);
|
|
status = 0;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
int i2c_set_bus_num(unsigned int bus)
|
|
{
|
|
if (bus >= I2C_BUS_MAX) {
|
|
printf("Bad bus: %x\n", bus);
|
|
return -1;
|
|
}
|
|
|
|
switch (bus) {
|
|
default:
|
|
bus = 0; /* Fall through */
|
|
case 0:
|
|
i2c_base = (struct i2c *)I2C_BASE1;
|
|
break;
|
|
case 1:
|
|
i2c_base = (struct i2c *)I2C_BASE2;
|
|
break;
|
|
#if (I2C_BUS_MAX > 2)
|
|
case 2:
|
|
i2c_base = (struct i2c *)I2C_BASE3;
|
|
break;
|
|
#if (I2C_BUS_MAX > 3)
|
|
case 3:
|
|
i2c_base = (struct i2c *)I2C_BASE4;
|
|
break;
|
|
#if (I2C_BUS_MAX > 4)
|
|
case 4:
|
|
i2c_base = (struct i2c *)I2C_BASE5;
|
|
break;
|
|
#endif
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
current_bus = bus;
|
|
|
|
if (!bus_initialized[current_bus])
|
|
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int i2c_get_bus_num(void)
|
|
{
|
|
return (int) current_bus;
|
|
}
|