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https://github.com/AsahiLinux/u-boot
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c05ed00afb
Move this uncommon header out of the common header. Signed-off-by: Simon Glass <sjg@chromium.org>
312 lines
7.1 KiB
C
312 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2011, 2013 Renesas Solutions Corp.
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* Copyright (C) 2011, 2013 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
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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.rst 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 <log.h>
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#include <asm/io.h>
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#include <linux/delay.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Every register is 32bit aligned, but only 8bits in size */
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#define ureg(name) u8 name; u8 __pad_##name##0; u16 __pad_##name##1;
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struct sh_i2c {
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ureg(icdr);
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ureg(iccr);
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ureg(icsr);
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ureg(icic);
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ureg(iccl);
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ureg(icch);
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};
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#undef ureg
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/* ICCR */
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#define SH_I2C_ICCR_ICE (1 << 7)
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#define SH_I2C_ICCR_RACK (1 << 6)
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#define SH_I2C_ICCR_RTS (1 << 4)
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#define SH_I2C_ICCR_BUSY (1 << 2)
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#define SH_I2C_ICCR_SCP (1 << 0)
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/* ICSR / ICIC */
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#define SH_IC_BUSY (1 << 4)
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#define SH_IC_TACK (1 << 2)
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#define SH_IC_WAIT (1 << 1)
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#define SH_IC_DTE (1 << 0)
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#ifdef CONFIG_SH_I2C_8BIT
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/* store 8th bit of iccl and icch in ICIC register */
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#define SH_I2C_ICIC_ICCLB8 (1 << 7)
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#define SH_I2C_ICIC_ICCHB8 (1 << 6)
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#endif
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static const struct sh_i2c *i2c_dev[CONFIG_SYS_I2C_SH_NUM_CONTROLLERS] = {
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(struct sh_i2c *)CONFIG_SYS_I2C_SH_BASE0,
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#ifdef CONFIG_SYS_I2C_SH_BASE1
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(struct sh_i2c *)CONFIG_SYS_I2C_SH_BASE1,
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#endif
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#ifdef CONFIG_SYS_I2C_SH_BASE2
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(struct sh_i2c *)CONFIG_SYS_I2C_SH_BASE2,
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#endif
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#ifdef CONFIG_SYS_I2C_SH_BASE3
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(struct sh_i2c *)CONFIG_SYS_I2C_SH_BASE3,
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#endif
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#ifdef CONFIG_SYS_I2C_SH_BASE4
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(struct sh_i2c *)CONFIG_SYS_I2C_SH_BASE4,
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#endif
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};
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static u16 iccl, icch;
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#define IRQ_WAIT 1000
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static void sh_irq_dte(struct sh_i2c *dev)
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{
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int i;
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for (i = 0; i < IRQ_WAIT; i++) {
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if (SH_IC_DTE & readb(&dev->icsr))
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break;
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udelay(10);
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}
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}
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static int sh_irq_dte_with_tack(struct sh_i2c *dev)
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{
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int i;
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for (i = 0; i < IRQ_WAIT; i++) {
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if (SH_IC_DTE & readb(&dev->icsr))
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break;
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if (SH_IC_TACK & readb(&dev->icsr))
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return -1;
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udelay(10);
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}
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return 0;
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}
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static void sh_irq_busy(struct sh_i2c *dev)
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{
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int i;
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for (i = 0; i < IRQ_WAIT; i++) {
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if (!(SH_IC_BUSY & readb(&dev->icsr)))
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break;
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udelay(10);
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}
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}
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static int sh_i2c_set_addr(struct sh_i2c *dev, u8 chip, u8 addr, int stop)
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{
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u8 icic = SH_IC_TACK;
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debug("%s: chip: %x, addr: %x iccl: %x, icch %x\n",
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__func__, chip, addr, iccl, icch);
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clrbits_8(&dev->iccr, SH_I2C_ICCR_ICE);
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setbits_8(&dev->iccr, SH_I2C_ICCR_ICE);
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writeb(iccl & 0xff, &dev->iccl);
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writeb(icch & 0xff, &dev->icch);
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#ifdef CONFIG_SH_I2C_8BIT
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if (iccl > 0xff)
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icic |= SH_I2C_ICIC_ICCLB8;
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if (icch > 0xff)
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icic |= SH_I2C_ICIC_ICCHB8;
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#endif
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writeb(icic, &dev->icic);
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writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RTS|SH_I2C_ICCR_BUSY), &dev->iccr);
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sh_irq_dte(dev);
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clrbits_8(&dev->icsr, SH_IC_TACK);
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writeb(chip << 1, &dev->icdr);
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if (sh_irq_dte_with_tack(dev) != 0)
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return -1;
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writeb(addr, &dev->icdr);
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if (stop)
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writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RTS), &dev->iccr);
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if (sh_irq_dte_with_tack(dev) != 0)
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return -1;
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return 0;
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}
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static void sh_i2c_finish(struct sh_i2c *dev)
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{
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writeb(0, &dev->icsr);
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clrbits_8(&dev->iccr, SH_I2C_ICCR_ICE);
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}
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static int
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sh_i2c_raw_write(struct sh_i2c *dev, u8 chip, uint addr, u8 val)
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{
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int ret = -1;
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if (sh_i2c_set_addr(dev, chip, addr, 0) != 0)
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goto exit0;
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udelay(10);
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writeb(val, &dev->icdr);
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if (sh_irq_dte_with_tack(dev) != 0)
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goto exit0;
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writeb((SH_I2C_ICCR_ICE | SH_I2C_ICCR_RTS), &dev->iccr);
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if (sh_irq_dte_with_tack(dev) != 0)
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goto exit0;
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sh_irq_busy(dev);
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ret = 0;
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exit0:
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sh_i2c_finish(dev);
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return ret;
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}
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static int sh_i2c_raw_read(struct sh_i2c *dev, u8 chip, u8 addr)
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{
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int ret = -1;
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#if defined(CONFIG_SH73A0)
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if (sh_i2c_set_addr(dev, chip, addr, 0) != 0)
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goto exit0;
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#else
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if (sh_i2c_set_addr(dev, chip, addr, 1) != 0)
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goto exit0;
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udelay(100);
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#endif
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writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RTS|SH_I2C_ICCR_BUSY), &dev->iccr);
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sh_irq_dte(dev);
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writeb(chip << 1 | 0x01, &dev->icdr);
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if (sh_irq_dte_with_tack(dev) != 0)
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goto exit0;
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writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_SCP), &dev->iccr);
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if (sh_irq_dte_with_tack(dev) != 0)
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goto exit0;
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ret = readb(&dev->icdr) & 0xff;
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writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RACK), &dev->iccr);
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readb(&dev->icdr); /* Dummy read */
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sh_irq_busy(dev);
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exit0:
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sh_i2c_finish(dev);
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return ret;
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}
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static void
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sh_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd)
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{
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int num, denom, tmp;
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/* No i2c support prior to relocation */
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if (!(gd->flags & GD_FLG_RELOC))
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return;
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/*
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* Calculate the value for iccl. From the data sheet:
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* iccl = (p-clock / transfer-rate) * (L / (L + H))
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* where L and H are the SCL low and high ratio.
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*/
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num = CONFIG_SH_I2C_CLOCK * CONFIG_SH_I2C_DATA_LOW;
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denom = speed * (CONFIG_SH_I2C_DATA_HIGH + CONFIG_SH_I2C_DATA_LOW);
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tmp = num * 10 / denom;
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if (tmp % 10 >= 5)
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iccl = (u16)((num/denom) + 1);
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else
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iccl = (u16)(num/denom);
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/* Calculate the value for icch. From the data sheet:
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icch = (p clock / transfer rate) * (H / (L + H)) */
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num = CONFIG_SH_I2C_CLOCK * CONFIG_SH_I2C_DATA_HIGH;
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tmp = num * 10 / denom;
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if (tmp % 10 >= 5)
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icch = (u16)((num/denom) + 1);
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else
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icch = (u16)(num/denom);
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debug("clock: %d, speed %d, iccl: %x, icch: %x\n",
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CONFIG_SH_I2C_CLOCK, speed, iccl, icch);
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}
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static int sh_i2c_read(struct i2c_adapter *adap, uint8_t chip,
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uint addr, int alen, u8 *data, int len)
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{
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int ret, i;
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struct sh_i2c *dev = (struct sh_i2c *)i2c_dev[adap->hwadapnr];
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for (i = 0; i < len; i++) {
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ret = sh_i2c_raw_read(dev, chip, addr + i);
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if (ret < 0)
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return -1;
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data[i] = ret & 0xff;
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debug("%s: data[%d]: %02x\n", __func__, i, data[i]);
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}
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return 0;
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}
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static int sh_i2c_write(struct i2c_adapter *adap, uint8_t chip, uint addr,
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int alen, u8 *data, int len)
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{
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struct sh_i2c *dev = (struct sh_i2c *)i2c_dev[adap->hwadapnr];
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int i;
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for (i = 0; i < len; i++) {
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debug("%s: data[%d]: %02x\n", __func__, i, data[i]);
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if (sh_i2c_raw_write(dev, chip, addr + i, data[i]) != 0)
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return -1;
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}
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return 0;
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}
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static int
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sh_i2c_probe(struct i2c_adapter *adap, u8 dev)
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{
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u8 dummy[1];
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return sh_i2c_read(adap, dev, 0, 0, dummy, sizeof dummy);
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}
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static unsigned int sh_i2c_set_bus_speed(struct i2c_adapter *adap,
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unsigned int speed)
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{
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struct sh_i2c *dev = (struct sh_i2c *)i2c_dev[adap->hwadapnr];
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sh_i2c_finish(dev);
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sh_i2c_init(adap, speed, 0);
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return 0;
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}
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/*
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* Register RCAR i2c adapters
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*/
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U_BOOT_I2C_ADAP_COMPLETE(sh_0, sh_i2c_init, sh_i2c_probe, sh_i2c_read,
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sh_i2c_write, sh_i2c_set_bus_speed, CONFIG_SYS_I2C_SH_SPEED0, 0, 0)
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#ifdef CONFIG_SYS_I2C_SH_BASE1
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U_BOOT_I2C_ADAP_COMPLETE(sh_1, sh_i2c_init, sh_i2c_probe, sh_i2c_read,
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sh_i2c_write, sh_i2c_set_bus_speed, CONFIG_SYS_I2C_SH_SPEED1, 0, 1)
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#endif
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#ifdef CONFIG_SYS_I2C_SH_BASE2
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U_BOOT_I2C_ADAP_COMPLETE(sh_2, sh_i2c_init, sh_i2c_probe, sh_i2c_read,
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sh_i2c_write, sh_i2c_set_bus_speed, CONFIG_SYS_I2C_SH_SPEED2, 0, 2)
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#endif
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#ifdef CONFIG_SYS_I2C_SH_BASE3
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U_BOOT_I2C_ADAP_COMPLETE(sh_3, sh_i2c_init, sh_i2c_probe, sh_i2c_read,
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sh_i2c_write, sh_i2c_set_bus_speed, CONFIG_SYS_I2C_SH_SPEED3, 0, 3)
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#endif
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#ifdef CONFIG_SYS_I2C_SH_BASE4
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U_BOOT_I2C_ADAP_COMPLETE(sh_4, sh_i2c_init, sh_i2c_probe, sh_i2c_read,
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sh_i2c_write, sh_i2c_set_bus_speed, CONFIG_SYS_I2C_SH_SPEED4, 0, 4)
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#endif
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