510 lines
11 KiB
C
510 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* TI DaVinci (TMS320DM644x) I2C driver.
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*
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* (C) Copyright 2012-2014
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* Texas Instruments Incorporated, <www.ti.com>
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* (C) Copyright 2007 Sergey Kubushyn <ksi@koi8.net>
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* --------------------------------------------------------
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*
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* NOTE: This driver should be converted to driver model before June 2017.
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* Please see doc/driver-model/i2c-howto.txt for instructions.
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*/
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#include <common.h>
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#include <i2c.h>
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#include <dm.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/i2c_defs.h>
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#include <asm/io.h>
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#include "davinci_i2c.h"
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#ifdef CONFIG_DM_I2C
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/* Information about i2c controller */
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struct i2c_bus {
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int id;
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uint speed;
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struct i2c_regs *regs;
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};
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#endif
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#define CHECK_NACK() \
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do {\
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if (tmp & (I2C_TIMEOUT | I2C_STAT_NACK)) {\
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REG(&(i2c_base->i2c_con)) = 0;\
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return 1;\
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} \
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} while (0)
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static int _wait_for_bus(struct i2c_regs *i2c_base)
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{
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int stat, timeout;
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REG(&(i2c_base->i2c_stat)) = 0xffff;
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for (timeout = 0; timeout < 10; timeout++) {
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stat = REG(&(i2c_base->i2c_stat));
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if (!((stat) & I2C_STAT_BB)) {
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REG(&(i2c_base->i2c_stat)) = 0xffff;
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return 0;
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}
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REG(&(i2c_base->i2c_stat)) = stat;
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udelay(50000);
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}
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REG(&(i2c_base->i2c_stat)) = 0xffff;
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return 1;
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}
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static int _poll_i2c_irq(struct i2c_regs *i2c_base, int mask)
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{
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int stat, timeout;
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for (timeout = 0; timeout < 10; timeout++) {
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udelay(1000);
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stat = REG(&(i2c_base->i2c_stat));
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if (stat & mask)
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return stat;
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}
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REG(&(i2c_base->i2c_stat)) = 0xffff;
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return stat | I2C_TIMEOUT;
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}
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static void _flush_rx(struct i2c_regs *i2c_base)
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{
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while (1) {
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if (!(REG(&(i2c_base->i2c_stat)) & I2C_STAT_RRDY))
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break;
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REG(&(i2c_base->i2c_drr));
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REG(&(i2c_base->i2c_stat)) = I2C_STAT_RRDY;
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udelay(1000);
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}
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}
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static uint _davinci_i2c_setspeed(struct i2c_regs *i2c_base,
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uint speed)
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{
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uint32_t div, psc;
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psc = 2;
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/* SCLL + SCLH */
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div = (CONFIG_SYS_HZ_CLOCK / ((psc + 1) * speed)) - 10;
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REG(&(i2c_base->i2c_psc)) = psc; /* 27MHz / (2 + 1) = 9MHz */
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REG(&(i2c_base->i2c_scll)) = (div * 50) / 100; /* 50% Duty */
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REG(&(i2c_base->i2c_sclh)) = div - REG(&(i2c_base->i2c_scll));
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return 0;
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}
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static void _davinci_i2c_init(struct i2c_regs *i2c_base,
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uint speed, int slaveadd)
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{
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if (REG(&(i2c_base->i2c_con)) & I2C_CON_EN) {
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REG(&(i2c_base->i2c_con)) = 0;
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udelay(50000);
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}
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_davinci_i2c_setspeed(i2c_base, speed);
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REG(&(i2c_base->i2c_oa)) = slaveadd;
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REG(&(i2c_base->i2c_cnt)) = 0;
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/* Interrupts must be enabled or I2C module won't work */
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REG(&(i2c_base->i2c_ie)) = I2C_IE_SCD_IE | I2C_IE_XRDY_IE |
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I2C_IE_RRDY_IE | I2C_IE_ARDY_IE | I2C_IE_NACK_IE;
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/* Now enable I2C controller (get it out of reset) */
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REG(&(i2c_base->i2c_con)) = I2C_CON_EN;
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udelay(1000);
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}
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static int _davinci_i2c_read(struct i2c_regs *i2c_base, uint8_t chip,
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uint32_t addr, int alen, uint8_t *buf, int len)
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{
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uint32_t tmp;
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int i;
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if ((alen < 0) || (alen > 2)) {
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printf("%s(): bogus address length %x\n", __func__, alen);
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return 1;
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}
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if (_wait_for_bus(i2c_base))
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return 1;
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if (alen != 0) {
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/* Start address phase */
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tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX;
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REG(&(i2c_base->i2c_cnt)) = alen;
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REG(&(i2c_base->i2c_sa)) = chip;
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REG(&(i2c_base->i2c_con)) = tmp;
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tmp = _poll_i2c_irq(i2c_base, I2C_STAT_XRDY | I2C_STAT_NACK);
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CHECK_NACK();
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switch (alen) {
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case 2:
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/* Send address MSByte */
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if (tmp & I2C_STAT_XRDY) {
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REG(&(i2c_base->i2c_dxr)) = (addr >> 8) & 0xff;
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} else {
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REG(&(i2c_base->i2c_con)) = 0;
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return 1;
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}
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tmp = _poll_i2c_irq(i2c_base,
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I2C_STAT_XRDY | I2C_STAT_NACK);
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CHECK_NACK();
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/* No break, fall through */
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case 1:
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/* Send address LSByte */
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if (tmp & I2C_STAT_XRDY) {
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REG(&(i2c_base->i2c_dxr)) = addr & 0xff;
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} else {
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REG(&(i2c_base->i2c_con)) = 0;
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return 1;
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}
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tmp = _poll_i2c_irq(i2c_base, I2C_STAT_XRDY |
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I2C_STAT_NACK | I2C_STAT_ARDY);
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CHECK_NACK();
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if (!(tmp & I2C_STAT_ARDY)) {
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REG(&(i2c_base->i2c_con)) = 0;
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return 1;
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}
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}
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}
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/* Address phase is over, now read 'len' bytes and stop */
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tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP;
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REG(&(i2c_base->i2c_cnt)) = len & 0xffff;
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REG(&(i2c_base->i2c_sa)) = chip;
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REG(&(i2c_base->i2c_con)) = tmp;
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for (i = 0; i < len; i++) {
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tmp = _poll_i2c_irq(i2c_base, I2C_STAT_RRDY | I2C_STAT_NACK |
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I2C_STAT_ROVR);
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CHECK_NACK();
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if (tmp & I2C_STAT_RRDY) {
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buf[i] = REG(&(i2c_base->i2c_drr));
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} else {
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REG(&(i2c_base->i2c_con)) = 0;
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return 1;
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}
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}
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tmp = _poll_i2c_irq(i2c_base, I2C_STAT_SCD | I2C_STAT_NACK);
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CHECK_NACK();
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if (!(tmp & I2C_STAT_SCD)) {
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REG(&(i2c_base->i2c_con)) = 0;
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return 1;
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}
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_flush_rx(i2c_base);
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REG(&(i2c_base->i2c_stat)) = 0xffff;
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REG(&(i2c_base->i2c_cnt)) = 0;
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REG(&(i2c_base->i2c_con)) = 0;
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return 0;
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}
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static int _davinci_i2c_write(struct i2c_regs *i2c_base, uint8_t chip,
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uint32_t addr, int alen, uint8_t *buf, int len)
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{
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uint32_t tmp;
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int i;
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if ((alen < 0) || (alen > 2)) {
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printf("%s(): bogus address length %x\n", __func__, alen);
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return 1;
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}
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if (len < 0) {
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printf("%s(): bogus length %x\n", __func__, len);
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return 1;
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}
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if (_wait_for_bus(i2c_base))
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return 1;
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/* Start address phase */
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tmp = I2C_CON_EN | I2C_CON_MST | I2C_CON_STT |
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I2C_CON_TRX | I2C_CON_STP;
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REG(&(i2c_base->i2c_cnt)) = (alen == 0) ?
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len & 0xffff : (len & 0xffff) + alen;
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REG(&(i2c_base->i2c_sa)) = chip;
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REG(&(i2c_base->i2c_con)) = tmp;
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switch (alen) {
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case 2:
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/* Send address MSByte */
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tmp = _poll_i2c_irq(i2c_base, I2C_STAT_XRDY | I2C_STAT_NACK);
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CHECK_NACK();
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if (tmp & I2C_STAT_XRDY) {
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REG(&(i2c_base->i2c_dxr)) = (addr >> 8) & 0xff;
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} else {
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REG(&(i2c_base->i2c_con)) = 0;
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return 1;
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}
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/* No break, fall through */
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case 1:
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/* Send address LSByte */
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tmp = _poll_i2c_irq(i2c_base, I2C_STAT_XRDY | I2C_STAT_NACK);
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CHECK_NACK();
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if (tmp & I2C_STAT_XRDY) {
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REG(&(i2c_base->i2c_dxr)) = addr & 0xff;
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} else {
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REG(&(i2c_base->i2c_con)) = 0;
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return 1;
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}
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}
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for (i = 0; i < len; i++) {
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tmp = _poll_i2c_irq(i2c_base, I2C_STAT_XRDY | I2C_STAT_NACK);
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CHECK_NACK();
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if (tmp & I2C_STAT_XRDY)
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REG(&(i2c_base->i2c_dxr)) = buf[i];
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else
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return 1;
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}
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tmp = _poll_i2c_irq(i2c_base, I2C_STAT_SCD | I2C_STAT_NACK);
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CHECK_NACK();
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if (!(tmp & I2C_STAT_SCD)) {
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REG(&(i2c_base->i2c_con)) = 0;
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return 1;
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}
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_flush_rx(i2c_base);
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REG(&(i2c_base->i2c_stat)) = 0xffff;
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REG(&(i2c_base->i2c_cnt)) = 0;
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REG(&(i2c_base->i2c_con)) = 0;
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return 0;
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}
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static int _davinci_i2c_probe_chip(struct i2c_regs *i2c_base, uint8_t chip)
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{
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int rc = 1;
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if (chip == REG(&(i2c_base->i2c_oa)))
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return rc;
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REG(&(i2c_base->i2c_con)) = 0;
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if (_wait_for_bus(i2c_base))
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return 1;
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/* try to read one byte from current (or only) address */
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REG(&(i2c_base->i2c_cnt)) = 1;
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REG(&(i2c_base->i2c_sa)) = chip;
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REG(&(i2c_base->i2c_con)) = (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT |
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I2C_CON_STP);
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udelay(50000);
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if (!(REG(&(i2c_base->i2c_stat)) & I2C_STAT_NACK)) {
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rc = 0;
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_flush_rx(i2c_base);
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REG(&(i2c_base->i2c_stat)) = 0xffff;
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} else {
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REG(&(i2c_base->i2c_stat)) = 0xffff;
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REG(&(i2c_base->i2c_con)) |= I2C_CON_STP;
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udelay(20000);
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if (_wait_for_bus(i2c_base))
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return 1;
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}
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_flush_rx(i2c_base);
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REG(&(i2c_base->i2c_stat)) = 0xffff;
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REG(&(i2c_base->i2c_cnt)) = 0;
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return rc;
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}
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#ifndef CONFIG_DM_I2C
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static struct i2c_regs *davinci_get_base(struct i2c_adapter *adap)
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{
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switch (adap->hwadapnr) {
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#if CONFIG_SYS_I2C_BUS_MAX >= 3
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case 2:
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return (struct i2c_regs *)I2C2_BASE;
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#endif
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#if CONFIG_SYS_I2C_BUS_MAX >= 2
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case 1:
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return (struct i2c_regs *)I2C1_BASE;
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#endif
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case 0:
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return (struct i2c_regs *)I2C_BASE;
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default:
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printf("wrong hwadapnr: %d\n", adap->hwadapnr);
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}
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return NULL;
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}
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static uint davinci_i2c_setspeed(struct i2c_adapter *adap, uint speed)
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{
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struct i2c_regs *i2c_base = davinci_get_base(adap);
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uint ret;
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adap->speed = speed;
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ret = _davinci_i2c_setspeed(i2c_base, speed);
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return ret;
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}
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static void davinci_i2c_init(struct i2c_adapter *adap, int speed,
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int slaveadd)
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{
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struct i2c_regs *i2c_base = davinci_get_base(adap);
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adap->speed = speed;
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_davinci_i2c_init(i2c_base, speed, slaveadd);
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return;
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}
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static int davinci_i2c_read(struct i2c_adapter *adap, uint8_t chip,
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uint32_t addr, int alen, uint8_t *buf, int len)
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{
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struct i2c_regs *i2c_base = davinci_get_base(adap);
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return _davinci_i2c_read(i2c_base, chip, addr, alen, buf, len);
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}
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static int davinci_i2c_write(struct i2c_adapter *adap, uint8_t chip,
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uint32_t addr, int alen, uint8_t *buf, int len)
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{
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struct i2c_regs *i2c_base = davinci_get_base(adap);
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return _davinci_i2c_write(i2c_base, chip, addr, alen, buf, len);
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}
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static int davinci_i2c_probe_chip(struct i2c_adapter *adap, uint8_t chip)
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{
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struct i2c_regs *i2c_base = davinci_get_base(adap);
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return _davinci_i2c_probe_chip(i2c_base, chip);
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}
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U_BOOT_I2C_ADAP_COMPLETE(davinci_0, davinci_i2c_init, davinci_i2c_probe_chip,
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davinci_i2c_read, davinci_i2c_write,
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davinci_i2c_setspeed,
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CONFIG_SYS_DAVINCI_I2C_SPEED,
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CONFIG_SYS_DAVINCI_I2C_SLAVE,
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0)
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#if CONFIG_SYS_I2C_BUS_MAX >= 2
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U_BOOT_I2C_ADAP_COMPLETE(davinci_1, davinci_i2c_init, davinci_i2c_probe_chip,
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davinci_i2c_read, davinci_i2c_write,
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davinci_i2c_setspeed,
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CONFIG_SYS_DAVINCI_I2C_SPEED1,
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CONFIG_SYS_DAVINCI_I2C_SLAVE1,
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1)
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#endif
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#if CONFIG_SYS_I2C_BUS_MAX >= 3
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U_BOOT_I2C_ADAP_COMPLETE(davinci_2, davinci_i2c_init, davinci_i2c_probe_chip,
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davinci_i2c_read, davinci_i2c_write,
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davinci_i2c_setspeed,
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CONFIG_SYS_DAVINCI_I2C_SPEED2,
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CONFIG_SYS_DAVINCI_I2C_SLAVE2,
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2)
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#endif
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#else /* CONFIG_DM_I2C */
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static int davinci_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
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int nmsgs)
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{
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struct i2c_bus *i2c_bus = dev_get_priv(bus);
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int ret;
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debug("i2c_xfer: %d messages\n", nmsgs);
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for (; nmsgs > 0; nmsgs--, msg++) {
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debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len);
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if (msg->flags & I2C_M_RD) {
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ret = _davinci_i2c_read(i2c_bus->regs, msg->addr,
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0, 0, msg->buf, msg->len);
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} else {
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ret = _davinci_i2c_write(i2c_bus->regs, msg->addr,
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0, 0, msg->buf, msg->len);
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}
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if (ret) {
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debug("i2c_write: error sending\n");
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return -EREMOTEIO;
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}
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}
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return ret;
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}
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static int davinci_i2c_set_speed(struct udevice *dev, uint speed)
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{
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struct i2c_bus *i2c_bus = dev_get_priv(dev);
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i2c_bus->speed = speed;
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return _davinci_i2c_setspeed(i2c_bus->regs, speed);
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}
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static int davinci_i2c_probe(struct udevice *dev)
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{
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struct i2c_bus *i2c_bus = dev_get_priv(dev);
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i2c_bus->id = dev->seq;
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i2c_bus->regs = (struct i2c_regs *)devfdt_get_addr(dev);
|
|
|
|
i2c_bus->speed = 100000;
|
|
_davinci_i2c_init(i2c_bus->regs, i2c_bus->speed, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int davinci_i2c_probe_chip(struct udevice *bus, uint chip_addr,
|
|
uint chip_flags)
|
|
{
|
|
struct i2c_bus *i2c_bus = dev_get_priv(bus);
|
|
|
|
return _davinci_i2c_probe_chip(i2c_bus->regs, chip_addr);
|
|
}
|
|
|
|
static const struct dm_i2c_ops davinci_i2c_ops = {
|
|
.xfer = davinci_i2c_xfer,
|
|
.probe_chip = davinci_i2c_probe_chip,
|
|
.set_bus_speed = davinci_i2c_set_speed,
|
|
};
|
|
|
|
static const struct udevice_id davinci_i2c_ids[] = {
|
|
{ .compatible = "ti,davinci-i2c"},
|
|
{ .compatible = "ti,keystone-i2c"},
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(i2c_davinci) = {
|
|
.name = "i2c_davinci",
|
|
.id = UCLASS_I2C,
|
|
.of_match = davinci_i2c_ids,
|
|
.probe = davinci_i2c_probe,
|
|
.priv_auto_alloc_size = sizeof(struct i2c_bus),
|
|
.ops = &davinci_i2c_ops,
|
|
};
|
|
|
|
#endif /* CONFIG_DM_I2C */
|