mirror of
https://github.com/AsahiLinux/u-boot
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dccacbe019
This fixes the following compiler warnings: fti2c010.c: In function 'fti2c010_read': fti2c010.c:204:8: warning: 'paddr' may be used uninitialized in this function [-Wuninitialized] fti2c010.c: In function 'fti2c010_write': fti2c010.c:266:8: warning: 'paddr' may be used uninitialized in this function [-Wuninitialized] Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com> Cc: Heiko Schocher <hs@denx.de>
346 lines
7.5 KiB
C
346 lines
7.5 KiB
C
/*
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* Faraday I2C Controller
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*
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* (C) Copyright 2010 Faraday Technology
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* Dante Su <dantesu@faraday-tech.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <i2c.h>
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#include "fti2c010.h"
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#ifndef CONFIG_SYS_I2C_SPEED
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#define CONFIG_SYS_I2C_SPEED 5000
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#endif
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#ifndef CONFIG_SYS_I2C_SLAVE
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#define CONFIG_SYS_I2C_SLAVE 0
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#endif
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#ifndef CONFIG_FTI2C010_CLOCK
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#define CONFIG_FTI2C010_CLOCK clk_get_rate("I2C")
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#endif
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#ifndef CONFIG_FTI2C010_TIMEOUT
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#define CONFIG_FTI2C010_TIMEOUT 10 /* ms */
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#endif
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/* 7-bit dev address + 1-bit read/write */
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#define I2C_RD(dev) ((((dev) << 1) & 0xfe) | 1)
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#define I2C_WR(dev) (((dev) << 1) & 0xfe)
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struct fti2c010_chip {
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struct fti2c010_regs *regs;
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};
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static struct fti2c010_chip chip_list[] = {
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{
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.regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE,
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},
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#ifdef CONFIG_FTI2C010_BASE1
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{
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.regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE1,
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},
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#endif
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#ifdef CONFIG_FTI2C010_BASE2
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{
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.regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE2,
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},
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#endif
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#ifdef CONFIG_FTI2C010_BASE3
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{
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.regs = (struct fti2c010_regs *)CONFIG_FTI2C010_BASE3,
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},
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#endif
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};
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static int fti2c010_reset(struct fti2c010_chip *chip)
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{
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ulong ts;
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int ret = -1;
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struct fti2c010_regs *regs = chip->regs;
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writel(CR_I2CRST, ®s->cr);
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for (ts = get_timer(0); get_timer(ts) < CONFIG_FTI2C010_TIMEOUT; ) {
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if (!(readl(®s->cr) & CR_I2CRST)) {
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ret = 0;
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break;
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}
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}
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if (ret)
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printf("fti2c010: reset timeout\n");
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return ret;
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}
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static int fti2c010_wait(struct fti2c010_chip *chip, uint32_t mask)
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{
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int ret = -1;
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uint32_t stat, ts;
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struct fti2c010_regs *regs = chip->regs;
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for (ts = get_timer(0); get_timer(ts) < CONFIG_FTI2C010_TIMEOUT; ) {
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stat = readl(®s->sr);
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if ((stat & mask) == mask) {
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ret = 0;
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break;
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}
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}
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return ret;
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}
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static unsigned int set_i2c_bus_speed(struct fti2c010_chip *chip,
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unsigned int speed)
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{
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struct fti2c010_regs *regs = chip->regs;
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unsigned int clk = CONFIG_FTI2C010_CLOCK;
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unsigned int gsr = 0;
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unsigned int tsr = 32;
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unsigned int div, rate;
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for (div = 0; div < 0x3ffff; ++div) {
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/* SCLout = PCLK/(2*(COUNT + 2) + GSR) */
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rate = clk / (2 * (div + 2) + gsr);
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if (rate <= speed)
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break;
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}
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writel(TGSR_GSR(gsr) | TGSR_TSR(tsr), ®s->tgsr);
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writel(CDR_DIV(div), ®s->cdr);
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return rate;
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}
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/*
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* Initialization, must be called once on start up, may be called
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* repeatedly to change the speed and slave addresses.
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*/
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static void fti2c010_init(struct i2c_adapter *adap, int speed, int slaveaddr)
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{
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struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
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if (adap->init_done)
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return;
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#ifdef CONFIG_SYS_I2C_INIT_BOARD
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/* Call board specific i2c bus reset routine before accessing the
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* environment, which might be in a chip on that bus. For details
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* about this problem see doc/I2C_Edge_Conditions.
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*/
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i2c_init_board();
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#endif
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/* master init */
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fti2c010_reset(chip);
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set_i2c_bus_speed(chip, speed);
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/* slave init, don't care */
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#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
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/* Call board specific i2c bus reset routine AFTER the bus has been
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* initialized. Use either this callpoint or i2c_init_board;
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* which is called before fti2c010_init operations.
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* For details about this problem see doc/I2C_Edge_Conditions.
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*/
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i2c_board_late_init();
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#endif
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}
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/*
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* Probe the given I2C chip address. Returns 0 if a chip responded,
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* not 0 on failure.
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*/
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static int fti2c010_probe(struct i2c_adapter *adap, u8 dev)
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{
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struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
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struct fti2c010_regs *regs = chip->regs;
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int ret;
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/* 1. Select slave device (7bits Address + 1bit R/W) */
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writel(I2C_WR(dev), ®s->dr);
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writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr);
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ret = fti2c010_wait(chip, SR_DT);
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if (ret)
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return ret;
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/* 2. Select device register */
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writel(0, ®s->dr);
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writel(CR_ENABLE | CR_TBEN, ®s->cr);
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ret = fti2c010_wait(chip, SR_DT);
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return ret;
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}
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static void to_i2c_addr(u8 *buf, uint32_t addr, int alen)
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{
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int i, shift;
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if (!buf || alen <= 0)
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return;
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/* MSB first */
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i = 0;
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shift = (alen - 1) * 8;
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while (alen-- > 0) {
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buf[i] = (u8)(addr >> shift);
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shift -= 8;
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}
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}
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static int fti2c010_read(struct i2c_adapter *adap,
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u8 dev, uint addr, int alen, uchar *buf, int len)
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{
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struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
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struct fti2c010_regs *regs = chip->regs;
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int ret, pos;
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uchar paddr[4] = { 0 };
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to_i2c_addr(paddr, addr, alen);
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/*
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* Phase A. Set register address
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*/
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/* A.1 Select slave device (7bits Address + 1bit R/W) */
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writel(I2C_WR(dev), ®s->dr);
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writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr);
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ret = fti2c010_wait(chip, SR_DT);
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if (ret)
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return ret;
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/* A.2 Select device register */
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for (pos = 0; pos < alen; ++pos) {
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uint32_t ctrl = CR_ENABLE | CR_TBEN;
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writel(paddr[pos], ®s->dr);
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writel(ctrl, ®s->cr);
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ret = fti2c010_wait(chip, SR_DT);
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if (ret)
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return ret;
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}
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/*
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* Phase B. Get register data
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*/
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/* B.1 Select slave device (7bits Address + 1bit R/W) */
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writel(I2C_RD(dev), ®s->dr);
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writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr);
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ret = fti2c010_wait(chip, SR_DT);
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if (ret)
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return ret;
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/* B.2 Get register data */
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for (pos = 0; pos < len; ++pos) {
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uint32_t ctrl = CR_ENABLE | CR_TBEN;
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uint32_t stat = SR_DR;
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if (pos == len - 1) {
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ctrl |= CR_NAK | CR_STOP;
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stat |= SR_ACK;
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}
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writel(ctrl, ®s->cr);
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ret = fti2c010_wait(chip, stat);
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if (ret)
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break;
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buf[pos] = (uchar)(readl(®s->dr) & 0xFF);
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}
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return ret;
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}
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static int fti2c010_write(struct i2c_adapter *adap,
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u8 dev, uint addr, int alen, u8 *buf, int len)
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{
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struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
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struct fti2c010_regs *regs = chip->regs;
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int ret, pos;
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uchar paddr[4] = { 0 };
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to_i2c_addr(paddr, addr, alen);
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/*
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* Phase A. Set register address
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*
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* A.1 Select slave device (7bits Address + 1bit R/W)
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*/
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writel(I2C_WR(dev), ®s->dr);
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writel(CR_ENABLE | CR_TBEN | CR_START, ®s->cr);
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ret = fti2c010_wait(chip, SR_DT);
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if (ret)
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return ret;
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/* A.2 Select device register */
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for (pos = 0; pos < alen; ++pos) {
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uint32_t ctrl = CR_ENABLE | CR_TBEN;
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writel(paddr[pos], ®s->dr);
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writel(ctrl, ®s->cr);
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ret = fti2c010_wait(chip, SR_DT);
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if (ret)
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return ret;
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}
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/*
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* Phase B. Set register data
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*/
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for (pos = 0; pos < len; ++pos) {
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uint32_t ctrl = CR_ENABLE | CR_TBEN;
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if (pos == len - 1)
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ctrl |= CR_STOP;
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writel(buf[pos], ®s->dr);
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writel(ctrl, ®s->cr);
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ret = fti2c010_wait(chip, SR_DT);
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if (ret)
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break;
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}
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return ret;
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}
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static unsigned int fti2c010_set_bus_speed(struct i2c_adapter *adap,
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unsigned int speed)
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{
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struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
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int ret;
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fti2c010_reset(chip);
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ret = set_i2c_bus_speed(chip, speed);
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return ret;
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}
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/*
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* Register i2c adapters
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*/
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U_BOOT_I2C_ADAP_COMPLETE(i2c_0, fti2c010_init, fti2c010_probe, fti2c010_read,
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fti2c010_write, fti2c010_set_bus_speed,
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CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE,
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0)
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#ifdef CONFIG_FTI2C010_BASE1
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U_BOOT_I2C_ADAP_COMPLETE(i2c_1, fti2c010_init, fti2c010_probe, fti2c010_read,
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fti2c010_write, fti2c010_set_bus_speed,
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CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE,
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1)
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#endif
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#ifdef CONFIG_FTI2C010_BASE2
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U_BOOT_I2C_ADAP_COMPLETE(i2c_2, fti2c010_init, fti2c010_probe, fti2c010_read,
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fti2c010_write, fti2c010_set_bus_speed,
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CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE,
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2)
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#endif
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#ifdef CONFIG_FTI2C010_BASE3
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U_BOOT_I2C_ADAP_COMPLETE(i2c_3, fti2c010_init, fti2c010_probe, fti2c010_read,
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fti2c010_write, fti2c010_set_bus_speed,
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CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE,
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3)
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#endif
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