[PATCH v1 11/15] aspeed: Add I2C Driver
Maxim Sloyko
maxims at google.com
Thu Apr 20 02:02:27 AEST 2017
On Wed, Apr 19, 2017 at 4:58 AM, Heiko Schocher <hs at denx.de> wrote:
> Hello Maxim,
>
> Am 17.04.2017 um 21:00 schrieb Maxim Sloyko:
>>
>> Add Device Model based I2C driver for ast2500/ast2400 SoCs.
>> The driver is very limited, it only supports master mode and
>> synchronous byte-by-byte reads/writes, no DMA or Pool Buffers.
>>
>> Signed-off-by: Maxim Sloyko <maxims at google.com>
>>
>> ---
>>
>> Changes in v1:
>> - Style fixes
>>
>>
>> ---
>> drivers/i2c/Kconfig | 9 ++
>> drivers/i2c/Makefile | 1 +
>> drivers/i2c/ast_i2c.c | 357
>> ++++++++++++++++++++++++++++++++++++++++++++++++++
>> drivers/i2c/ast_i2c.h | 132 +++++++++++++++++++
>> 4 files changed, 499 insertions(+)
>> create mode 100644 drivers/i2c/ast_i2c.c
>> create mode 100644 drivers/i2c/ast_i2c.h
>
>
> Is this "version 2" from the patch you posted in march?
Yes, sorry, I think I forgot to add proper "In-Reply-To" header.
>
> Acked-by: Heiko Schocher <hs at denx.de>
>
> bye,
> Heiko
>
>>
>> diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
>> index 39f62daf5d..e661a308b0 100644
>> --- a/drivers/i2c/Kconfig
>> +++ b/drivers/i2c/Kconfig
>> @@ -100,6 +100,15 @@ config SYS_I2C_DW_ENABLE_STATUS_UNSUPPORTED
>> enable status register. This config option can be enabled in
>> such
>> cases.
>>
>> +config SYS_I2C_ASPEED
>> + bool "Aspeed I2C Controller"
>> + depends on DM_I2C && ARCH_ASPEED
>> + help
>> + Say yes here to select Aspeed I2C Host Controller. The driver
>> + supports AST2500 and AST2400 controllers, but is very limited.
>> + Only single master mode is supported and only byte-by-byte
>> + synchronous reads and writes are supported, no Pool Buffers or
>> DMA.
>> +
>> config SYS_I2C_INTEL
>> bool "Intel I2C/SMBUS driver"
>> depends on DM_I2C
>> diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
>> index 7c86198863..229fd476db 100644
>> --- a/drivers/i2c/Makefile
>> +++ b/drivers/i2c/Makefile
>> @@ -16,6 +16,7 @@ obj-$(CONFIG_PCA9564_I2C) += pca9564_i2c.o
>> obj-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
>> obj-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o
>> obj-$(CONFIG_SYS_I2C) += i2c_core.o
>> +obj-$(CONFIG_SYS_I2C_ASPEED) += ast_i2c.o
>> obj-$(CONFIG_SYS_I2C_AT91) += at91_i2c.o
>> obj-$(CONFIG_SYS_I2C_CADENCE) += i2c-cdns.o
>> obj-$(CONFIG_SYS_I2C_DAVINCI) += davinci_i2c.o
>> diff --git a/drivers/i2c/ast_i2c.c b/drivers/i2c/ast_i2c.c
>> new file mode 100644
>> index 0000000000..16dfb57066
>> --- /dev/null
>> +++ b/drivers/i2c/ast_i2c.c
>> @@ -0,0 +1,357 @@
>> +/*
>> + * Copyright (C) 2012-2020 ASPEED Technology Inc.
>> + * Copyright 2016 IBM Corporation
>> + * Copyright 2017 Google, Inc.
>> + *
>> + * SPDX-License-Identifier: GPL-2.0+
>> + */
>> +
>> +#include <common.h>
>> +#include <clk.h>
>> +#include <dm.h>
>> +#include <errno.h>
>> +#include <fdtdec.h>
>> +#include <i2c.h>
>> +#include <asm/io.h>
>> +#include <asm/arch/scu_ast2500.h>
>> +
>> +#include "ast_i2c.h"
>> +
>> +#define I2C_TIMEOUT_US 100000
>> +#define I2C_SLEEP_STEP_US 20
>> +
>> +#define HIGHSPEED_TTIMEOUT 3
>> +
>> +DECLARE_GLOBAL_DATA_PTR;
>> +
>> +/*
>> + * Device private data
>> + */
>> +struct ast_i2c_priv {
>> + /* This device's clock */
>> + struct clk clk;
>> + /* Device registers */
>> + struct ast_i2c_regs *regs;
>> + /* I2C speed in Hz */
>> + int speed;
>> +};
>> +
>> +/*
>> + * Given desired divider ratio, return the value that needs to be set
>> + * in Clock and AC Timing Control register
>> + */
>> +static u32 get_clk_reg_val(ulong divider_ratio)
>> +{
>> + ulong inc = 0, div;
>> + ulong scl_low, scl_high, data;
>> +
>> + for (div = 0; divider_ratio >= 16; div++) {
>> + inc |= (divider_ratio & 1);
>> + divider_ratio >>= 1;
>> + }
>> + divider_ratio += inc;
>> + scl_low = (divider_ratio >> 1) - 1;
>> + scl_high = divider_ratio - scl_low - 2;
>> + data = I2CD_CACTC_BASE
>> + | (scl_high << I2CD_TCKHIGH_SHIFT)
>> + | (scl_low << I2CD_TCKLOW_SHIFT)
>> + | (div << I2CD_BASE_DIV_SHIFT);
>> +
>> + return data;
>> +}
>> +
>> +static void ast_i2c_clear_interrupts(struct udevice *dev)
>> +{
>> + struct ast_i2c_priv *priv = dev_get_priv(dev);
>> +
>> + writel(~0, &priv->regs->isr);
>> +}
>> +
>> +static void ast_i2c_init_bus(struct udevice *dev)
>> +{
>> + struct ast_i2c_priv *priv = dev_get_priv(dev);
>> +
>> + /* Reset device */
>> + writel(0, &priv->regs->fcr);
>> + /* Enable Master Mode. Assuming single-master */
>> + writel(I2CD_MASTER_EN
>> + | I2CD_M_SDA_LOCK_EN
>> + | I2CD_MULTI_MASTER_DIS | I2CD_M_SCL_DRIVE_EN,
>> + &priv->regs->fcr);
>> + /* Enable Interrupts */
>> + writel(I2CD_INTR_TX_ACK
>> + | I2CD_INTR_TX_NAK
>> + | I2CD_INTR_RX_DONE
>> + | I2CD_INTR_BUS_RECOVER_DONE
>> + | I2CD_INTR_NORMAL_STOP
>> + | I2CD_INTR_ABNORMAL, &priv->regs->icr);
>> +}
>> +
>> +static int ast_i2c_ofdata_to_platdata(struct udevice *dev)
>> +{
>> + struct ast_i2c_priv *priv = dev_get_priv(dev);
>> + int ret;
>> +
>> + priv->regs = dev_get_addr_ptr(dev);
>> + if (IS_ERR(priv->regs))
>> + return PTR_ERR(priv->regs);
>> +
>> + ret = clk_get_by_index(dev, 0, &priv->clk);
>> + if (ret < 0) {
>> + debug("%s: Can't get clock for %s: %d\n", __func__,
>> dev->name,
>> + ret);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int ast_i2c_probe(struct udevice *dev)
>> +{
>> + struct ast2500_scu *scu;
>> +
>> + debug("Enabling I2C%u\n", dev->seq);
>> +
>> + /*
>> + * Get all I2C devices out of Reset.
>> + * Only needs to be done once, but doing it for every
>> + * device does not hurt.
>> + */
>> + scu = ast_get_scu();
>> + ast_scu_unlock(scu);
>> + clrbits_le32(&scu->sysreset_ctrl1, SCU_SYSRESET_I2C);
>> + ast_scu_lock(scu);
>> +
>> + ast_i2c_init_bus(dev);
>> +
>> + return 0;
>> +}
>> +
>> +static int ast_i2c_wait_isr(struct udevice *dev, u32 flag)
>> +{
>> + struct ast_i2c_priv *priv = dev_get_priv(dev);
>> + int timeout = I2C_TIMEOUT_US;
>> +
>> + while (!(readl(&priv->regs->isr) & flag) && timeout > 0) {
>> + udelay(I2C_SLEEP_STEP_US);
>> + timeout -= I2C_SLEEP_STEP_US;
>> + }
>> +
>> + ast_i2c_clear_interrupts(dev);
>> + if (timeout <= 0)
>> + return -ETIMEDOUT;
>> +
>> + return 0;
>> +}
>> +
>> +static int ast_i2c_send_stop(struct udevice *dev)
>> +{
>> + struct ast_i2c_priv *priv = dev_get_priv(dev);
>> +
>> + writel(I2CD_M_STOP_CMD, &priv->regs->csr);
>> +
>> + return ast_i2c_wait_isr(dev, I2CD_INTR_NORMAL_STOP);
>> +}
>> +
>> +static int ast_i2c_wait_tx(struct udevice *dev)
>> +{
>> + struct ast_i2c_priv *priv = dev_get_priv(dev);
>> + int timeout = I2C_TIMEOUT_US;
>> + u32 flag = I2CD_INTR_TX_ACK | I2CD_INTR_TX_NAK;
>> + u32 status = readl(&priv->regs->isr) & flag;
>> + int ret = 0;
>> +
>> + while (!status && timeout > 0) {
>> + status = readl(&priv->regs->isr) & flag;
>> + udelay(I2C_SLEEP_STEP_US);
>> + timeout -= I2C_SLEEP_STEP_US;
>> + }
>> +
>> + if (status == I2CD_INTR_TX_NAK)
>> + ret = -EREMOTEIO;
>> +
>> + if (timeout <= 0)
>> + ret = -ETIMEDOUT;
>> +
>> + ast_i2c_clear_interrupts(dev);
>> +
>> + return ret;
>> +}
>> +
>> +static int ast_i2c_start_txn(struct udevice *dev, uint devaddr)
>> +{
>> + struct ast_i2c_priv *priv = dev_get_priv(dev);
>> +
>> + /* Start and Send Device Address */
>> + writel(devaddr, &priv->regs->trbbr);
>> + writel(I2CD_M_START_CMD | I2CD_M_TX_CMD, &priv->regs->csr);
>> +
>> + return ast_i2c_wait_tx(dev);
>> +}
>> +
>> +static int ast_i2c_read_data(struct udevice *dev, u8 chip_addr, u8
>> *buffer,
>> + size_t len, bool send_stop)
>> +{
>> + struct ast_i2c_priv *priv = dev_get_priv(dev);
>> + u32 i2c_cmd = I2CD_M_RX_CMD;
>> + int ret;
>> +
>> + ret = ast_i2c_start_txn(dev, (chip_addr << 1) | I2C_M_RD);
>> + if (ret < 0)
>> + return ret;
>> +
>> + for (; len > 0; len--, buffer++) {
>> + if (len == 1)
>> + i2c_cmd |= I2CD_M_S_RX_CMD_LAST;
>> + writel(i2c_cmd, &priv->regs->csr);
>> + ret = ast_i2c_wait_isr(dev, I2CD_INTR_RX_DONE);
>> + if (ret < 0)
>> + return ret;
>> + *buffer = (readl(&priv->regs->trbbr) & I2CD_RX_DATA_MASK)
>> + >> I2CD_RX_DATA_SHIFT;
>> + }
>> + ast_i2c_clear_interrupts(dev);
>> +
>> + if (send_stop)
>> + return ast_i2c_send_stop(dev);
>> +
>> + return 0;
>> +}
>> +
>> +static int ast_i2c_write_data(struct udevice *dev, u8 chip_addr, u8
>> + *buffer, size_t len, bool send_stop)
>> +{
>> + struct ast_i2c_priv *priv = dev_get_priv(dev);
>> + int ret;
>> +
>> + ret = ast_i2c_start_txn(dev, (chip_addr << 1));
>> + if (ret < 0)
>> + return ret;
>> +
>> + for (; len > 0; len--, buffer++) {
>> + writel(*buffer, &priv->regs->trbbr);
>> + writel(I2CD_M_TX_CMD, &priv->regs->csr);
>> + ret = ast_i2c_wait_tx(dev);
>> + if (ret < 0)
>> + return ret;
>> + }
>> +
>> + if (send_stop)
>> + return ast_i2c_send_stop(dev);
>> +
>> + return 0;
>> +}
>> +
>> +static int ast_i2c_deblock(struct udevice *dev)
>> +{
>> + struct ast_i2c_priv *priv = dev_get_priv(dev);
>> + struct ast_i2c_regs *regs = priv->regs;
>> + u32 csr = readl(®s->csr);
>> + bool sda_high = csr & I2CD_SDA_LINE_STS;
>> + bool scl_high = csr & I2CD_SCL_LINE_STS;
>> + int ret = 0;
>> +
>> + if (sda_high && scl_high) {
>> + /* Bus is idle, no deblocking needed. */
>> + return 0;
>> + } else if (sda_high) {
>> + /* Send stop command */
>> + debug("Unterminated TXN in (%x), sending stop\n", csr);
>> + ret = ast_i2c_send_stop(dev);
>> + } else if (scl_high) {
>> + /* Possibly stuck slave */
>> + debug("Bus stuck (%x), attempting recovery\n", csr);
>> + writel(I2CD_BUS_RECOVER_CMD, ®s->csr);
>> + ret = ast_i2c_wait_isr(dev, I2CD_INTR_BUS_RECOVER_DONE);
>> + } else {
>> + /* Just try to reinit the device. */
>> + ast_i2c_init_bus(dev);
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static int ast_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int
>> nmsgs)
>> +{
>> + int ret;
>> +
>> + ret = ast_i2c_deblock(dev);
>> + if (ret < 0)
>> + return ret;
>> +
>> + debug("i2c_xfer: %d messages\n", nmsgs);
>> + for (; nmsgs > 0; nmsgs--, msg++) {
>> + if (msg->flags & I2C_M_RD) {
>> + debug("i2c_read: chip=0x%x, len=0x%x,
>> flags=0x%x\n",
>> + msg->addr, msg->len, msg->flags);
>> + ret = ast_i2c_read_data(dev, msg->addr, msg->buf,
>> + msg->len, (nmsgs == 1));
>> + } else {
>> + debug("i2c_write: chip=0x%x, len=0x%x,
>> flags=0x%x\n",
>> + msg->addr, msg->len, msg->flags);
>> + ret = ast_i2c_write_data(dev, msg->addr, msg->buf,
>> + msg->len, (nmsgs == 1));
>> + }
>> + if (ret) {
>> + debug("%s: error (%d)\n", __func__, ret);
>> + return -EREMOTEIO;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int ast_i2c_set_speed(struct udevice *dev, unsigned int speed)
>> +{
>> + struct ast_i2c_priv *priv = dev_get_priv(dev);
>> + struct ast_i2c_regs *regs = priv->regs;
>> + ulong i2c_rate, divider;
>> +
>> + debug("Setting speed for I2C%d to <%u>\n", dev->seq, speed);
>> + if (!speed) {
>> + debug("No valid speed specified\n");
>> + return -EINVAL;
>> + }
>> +
>> + i2c_rate = clk_get_rate(&priv->clk);
>> + divider = i2c_rate / speed;
>> +
>> + priv->speed = speed;
>> + if (speed > I2C_HIGHSPEED_RATE) {
>> + debug("Enable High Speed\n");
>> + setbits_le32(®s->fcr, I2CD_M_HIGH_SPEED_EN
>> + | I2CD_M_SDA_DRIVE_1T_EN
>> + | I2CD_SDA_DRIVE_1T_EN);
>> + writel(HIGHSPEED_TTIMEOUT, ®s->cactcr2);
>> + } else {
>> + debug("Enabling Normal Speed\n");
>> + writel(I2CD_NO_TIMEOUT_CTRL, ®s->cactcr2);
>> + }
>> +
>> + writel(get_clk_reg_val(divider), ®s->cactcr1);
>> + ast_i2c_clear_interrupts(dev);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct dm_i2c_ops ast_i2c_ops = {
>> + .xfer = ast_i2c_xfer,
>> + .set_bus_speed = ast_i2c_set_speed,
>> + .deblock = ast_i2c_deblock,
>> +};
>> +
>> +static const struct udevice_id ast_i2c_ids[] = {
>> + { .compatible = "aspeed,ast2400-i2c-bus" },
>> + { .compatible = "aspeed,ast2500-i2c-bus" },
>> + { },
>> +};
>> +
>> +U_BOOT_DRIVER(ast_i2c) = {
>> + .name = "ast_i2c",
>> + .id = UCLASS_I2C,
>> + .of_match = ast_i2c_ids,
>> + .probe = ast_i2c_probe,
>> + .ofdata_to_platdata = ast_i2c_ofdata_to_platdata,
>> + .priv_auto_alloc_size = sizeof(struct ast_i2c_priv),
>> + .ops = &ast_i2c_ops,
>> +};
>> diff --git a/drivers/i2c/ast_i2c.h b/drivers/i2c/ast_i2c.h
>> new file mode 100644
>> index 0000000000..e5dec7a480
>> --- /dev/null
>> +++ b/drivers/i2c/ast_i2c.h
>> @@ -0,0 +1,132 @@
>> +/*
>> + * Copyright (C) 2012-2020 ASPEED Technology Inc.
>> + * Copyright 2016 IBM Corporation
>> + * Copyright 2017 Google, Inc.
>> + *
>> + * SPDX-License-Identifier: GPL-2.0+
>> + */
>> +#ifndef __AST_I2C_H_
>> +#define __AST_I2C_H_
>> +
>> +struct ast_i2c_regs {
>> + u32 fcr;
>> + u32 cactcr1;
>> + u32 cactcr2;
>> + u32 icr;
>> + u32 isr;
>> + u32 csr;
>> + u32 sdar;
>> + u32 pbcr;
>> + u32 trbbr;
>> +#ifdef CONFIG_ASPEED_AST2500
>> + u32 dma_mbar;
>> + u32 dma_tlr;
>> +#endif
>> +};
>> +
>> +/* Device Register Definition */
>> +/* 0x00 : I2CD Function Control Register */
>> +#define I2CD_BUFF_SEL_MASK (0x7 << 20)
>> +#define I2CD_BUFF_SEL(x) (x << 20)
>> +#define I2CD_M_SDA_LOCK_EN (0x1 << 16)
>> +#define I2CD_MULTI_MASTER_DIS (0x1 << 15)
>> +#define I2CD_M_SCL_DRIVE_EN (0x1 << 14)
>> +#define I2CD_MSB_STS (0x1 << 9)
>> +#define I2CD_SDA_DRIVE_1T_EN (0x1 << 8)
>> +#define I2CD_M_SDA_DRIVE_1T_EN (0x1 << 7)
>> +#define I2CD_M_HIGH_SPEED_EN (0x1 << 6)
>> +#define I2CD_DEF_ADDR_EN (0x1 << 5)
>> +#define I2CD_DEF_ALERT_EN (0x1 << 4)
>> +#define I2CD_DEF_ARP_EN (0x1 << 3)
>> +#define I2CD_DEF_GCALL_EN (0x1 << 2)
>> +#define I2CD_SLAVE_EN (0x1 << 1)
>> +#define I2CD_MASTER_EN (0x1)
>> +
>> +/* 0x04 : I2CD Clock and AC Timing Control Register #1 */
>> +/* Base register value. These bits are always set by the driver. */
>> +#define I2CD_CACTC_BASE 0xfff00300
>> +#define I2CD_TCKHIGH_SHIFT 16
>> +#define I2CD_TCKLOW_SHIFT 12
>> +#define I2CD_THDDAT_SHIFT 10
>> +#define I2CD_TO_DIV_SHIFT 8
>> +#define I2CD_BASE_DIV_SHIFT 0
>> +
>> +/* 0x08 : I2CD Clock and AC Timing Control Register #2 */
>> +#define I2CD_tTIMEOUT 1
>> +#define I2CD_NO_TIMEOUT_CTRL 0
>> +
>> +/* 0x0c : I2CD Interrupt Control Register &
>> + * 0x10 : I2CD Interrupt Status Register
>> + *
>> + * These share bit definitions, so use the same values for the enable &
>> + * status bits.
>> + */
>> +#define I2CD_INTR_SDA_DL_TIMEOUT (0x1 << 14)
>> +#define I2CD_INTR_BUS_RECOVER_DONE (0x1 << 13)
>> +#define I2CD_INTR_SMBUS_ALERT (0x1 << 12)
>> +#define I2CD_INTR_SMBUS_ARP_ADDR (0x1 << 11)
>> +#define I2CD_INTR_SMBUS_DEV_ALERT_ADDR (0x1 << 10)
>> +#define I2CD_INTR_SMBUS_DEF_ADDR (0x1 << 9)
>> +#define I2CD_INTR_GCALL_ADDR (0x1 << 8)
>> +#define I2CD_INTR_SLAVE_MATCH (0x1 << 7)
>> +#define I2CD_INTR_SCL_TIMEOUT (0x1 << 6)
>> +#define I2CD_INTR_ABNORMAL (0x1 << 5)
>> +#define I2CD_INTR_NORMAL_STOP (0x1 << 4)
>> +#define I2CD_INTR_ARBIT_LOSS (0x1 << 3)
>> +#define I2CD_INTR_RX_DONE (0x1 << 2)
>> +#define I2CD_INTR_TX_NAK (0x1 << 1)
>> +#define I2CD_INTR_TX_ACK (0x1 << 0)
>> +
>> +/* 0x14 : I2CD Command/Status Register */
>> +#define I2CD_SDA_OE (0x1 << 28)
>> +#define I2CD_SDA_O (0x1 << 27)
>> +#define I2CD_SCL_OE (0x1 << 26)
>> +#define I2CD_SCL_O (0x1 << 25)
>> +#define I2CD_TX_TIMING (0x1 << 24)
>> +#define I2CD_TX_STATUS (0x1 << 23)
>> +
>> +/* Tx State Machine */
>> +#define I2CD_IDLE 0x0
>> +#define I2CD_MACTIVE 0x8
>> +#define I2CD_MSTART 0x9
>> +#define I2CD_MSTARTR 0xa
>> +#define I2CD_MSTOP 0xb
>> +#define I2CD_MTXD 0xc
>> +#define I2CD_MRXACK 0xd
>> +#define I2CD_MRXD 0xe
>> +#define I2CD_MTXACK 0xf
>> +#define I2CD_SWAIT 0x1
>> +#define I2CD_SRXD 0x4
>> +#define I2CD_STXACK 0x5
>> +#define I2CD_STXD 0x6
>> +#define I2CD_SRXACK 0x7
>> +#define I2CD_RECOVER 0x3
>> +
>> +#define I2CD_SCL_LINE_STS (0x1 << 18)
>> +#define I2CD_SDA_LINE_STS (0x1 << 17)
>> +#define I2CD_BUS_BUSY_STS (0x1 << 16)
>> +#define I2CD_SDA_OE_OUT_DIR (0x1 << 15)
>> +#define I2CD_SDA_O_OUT_DIR (0x1 << 14)
>> +#define I2CD_SCL_OE_OUT_DIR (0x1 << 13)
>> +#define I2CD_SCL_O_OUT_DIR (0x1 << 12)
>> +#define I2CD_BUS_RECOVER_CMD (0x1 << 11)
>> +#define I2CD_S_ALT_EN (0x1 << 10)
>> +#define I2CD_RX_DMA_ENABLE (0x1 << 9)
>> +#define I2CD_TX_DMA_ENABLE (0x1 << 8)
>> +
>> +/* Command Bit */
>> +#define I2CD_RX_BUFF_ENABLE (0x1 << 7)
>> +#define I2CD_TX_BUFF_ENABLE (0x1 << 6)
>> +#define I2CD_M_STOP_CMD (0x1 << 5)
>> +#define I2CD_M_S_RX_CMD_LAST (0x1 << 4)
>> +#define I2CD_M_RX_CMD (0x1 << 3)
>> +#define I2CD_S_TX_CMD (0x1 << 2)
>> +#define I2CD_M_TX_CMD (0x1 << 1)
>> +#define I2CD_M_START_CMD 0x1
>> +
>> +#define I2CD_RX_DATA_SHIFT 8
>> +#define I2CD_RX_DATA_MASK (0xff <<
>> I2CD_RX_DATA_SHIFT)
>> +
>> +#define I2C_HIGHSPEED_RATE 400000
>> +
>> +#endif /* __AST_I2C_H_ */
>>
>
> --
> DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
--
Maxim Sloyko
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