From: Michael Brandt michael.brandt@stericsson.com
Signed-off-by: John Rigby john.rigby@linaro.org CC: Heiko Schocher hs@denx.de --- v2: Incorporate suggestions from Heiko Schocher v3: Fix line length problem reported by Heiko Schocher v4: No changes just rebased to latest and included for completeness drivers/i2c/Makefile | 1 + drivers/i2c/u8500_i2c.c | 613 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/i2c/u8500_i2c.h | 194 +++++++++++++++ 3 files changed, 808 insertions(+), 0 deletions(-) create mode 100644 drivers/i2c/u8500_i2c.c create mode 100644 drivers/i2c/u8500_i2c.h
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index 052fe36..43507fc 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -40,6 +40,7 @@ COBJS-$(CONFIG_S3C44B0_I2C) += s3c44b0_i2c.o COBJS-$(CONFIG_SOFT_I2C) += soft_i2c.o COBJS-$(CONFIG_SPEAR_I2C) += spr_i2c.o COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o +COBJS-$(CONFIG_U8500_I2C) += u8500_i2c.o
COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/i2c/u8500_i2c.c b/drivers/i2c/u8500_i2c.c new file mode 100644 index 0000000..ea8a71d --- /dev/null +++ b/drivers/i2c/u8500_i2c.c @@ -0,0 +1,613 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * Basic U-Boot I2C interface for STn8500/DB8500 + * Author: Michael Brandt Michael.Brandt@stericsson.com for ST-Ericsson + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* + * Only 7-bit I2C device addresses are supported. + */ + +#include <common.h> +#include <i2c.h> + +#include "u8500_i2c.h" +#include <asm/io.h> +#include <asm/arch/clock.h> + +#define U8500_I2C_ENDAD_COUNTER (CONFIG_SYS_HZ/100) /* I2C bus timeout */ +#define U8500_I2C_FIFO_FLUSH_COUNTER 500000 /* flush "timeout" */ +#define U8500_I2C_SCL_FREQ 100000 /* I2C bus clock freq */ +#define U8500_I2C_INPUT_FREQ 48000000 /* Input clock freq */ +#define TX_FIFO_THRESHOLD 0x4 +#define RX_FIFO_THRESHOLD 0x4 +#define SLAVE_SETUP_TIME 14 /* Slave data setup time, 250ns for 48MHz i2c_clk */ + +#define WRITE_FIELD(var, mask, shift, value) \ + (var = ((var & ~(mask)) | ((value) << (shift)))) + +static unsigned int bus_initialized[CONFIG_SYS_U8500_I2C_BUS_MAX]; +static unsigned int i2c_bus_num; +static unsigned int i2c_bus_speed[] = { + CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SPEED, + CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SPEED +}; +static struct u8500_i2c_regs *i2c_dev[] = { + (struct u8500_i2c_regs *)CONFIG_SYS_U8500_I2C0_BASE, + (struct u8500_i2c_regs *)CONFIG_SYS_U8500_I2C1_BASE, + (struct u8500_i2c_regs *)CONFIG_SYS_U8500_I2C2_BASE, + (struct u8500_i2c_regs *)CONFIG_SYS_U8500_I2C3_BASE, +}; + +static struct { + int periph; + int pcken; + int kcken; +} i2c_clock_bits[] = { + {3, 3, 3}, /* I2C0 */ + {1, 2, 2}, /* I2C1 */ + {1, 6, 6}, /* I2C2 */ + {2, 0, 0}, /* I2C3 */ +}; + +static void i2c_set_bit(void *reg, u32 mask) +{ + writel(readl(reg) | mask, reg); +} + +static void i2c_clr_bit(void *reg, u32 mask) +{ + writel(readl(reg) & ~mask, reg); +} + +static void i2c_write_field(void *reg, u32 mask, uint shift, u32 value) +{ + writel((readl(reg) & ~mask) | (value << shift), reg); +} + +static int __i2c_set_bus_speed(unsigned int speed) +{ + u32 value; + struct u8500_i2c_regs *i2c_regs; + + i2c_regs = i2c_dev[i2c_bus_num]; + + /* Select standard (100 kbps) speed mode */ + i2c_write_field(&i2c_regs->cr, U8500_I2C_CR_SM, + U8500_I2C_CR_SHIFT_SM, 0x0); + + /* + * Set the Baud Rate Counter 2 value + * Baud rate (standard) = fi2cclk / ( (BRCNT2 x 2) + Foncycle ) + * Foncycle = 0 (no digital filtering) + */ + value = (u32) (U8500_I2C_INPUT_FREQ / (speed * 2)); + i2c_write_field(&i2c_regs->brcr, U8500_I2C_BRCR_BRCNT2, + U8500_I2C_BRCR_SHIFT_BRCNT2, value); + + /* ensure that BRCNT value is zero */ + i2c_write_field(&i2c_regs->brcr, U8500_I2C_BRCR_BRCNT1, + U8500_I2C_BRCR_SHIFT_BRCNT1, 0); + + return U8500_I2C_INPUT_FREQ/(value * 2); +} + +/* + * i2c_init - initialize the i2c bus + * + * speed: bus speed (in HZ) + * slaveaddr: address of device in slave mode + * + * Slave mode is not implemented. + */ +void i2c_init(int speed, int slaveaddr) +{ + struct u8500_i2c_regs *i2c_regs; + + debug("i2c_init bus %d, speed %d\n", i2c_bus_num, speed); + + u8500_clock_enable(i2c_clock_bits[i2c_bus_num].periph, + i2c_clock_bits[i2c_bus_num].pcken, + i2c_clock_bits[i2c_bus_num].kcken); + + i2c_regs = i2c_dev[i2c_bus_num]; + + /* Disable the controller */ + i2c_clr_bit(&i2c_regs->cr, U8500_I2C_CR_PE); + + /* Clear registers */ + writel(0, &i2c_regs->cr); + writel(0, &i2c_regs->scr); + writel(0, &i2c_regs->hsmcr); + writel(0, &i2c_regs->tftr); + writel(0, &i2c_regs->rftr); + writel(0, &i2c_regs->dmar); + + i2c_bus_speed[i2c_bus_num] = __i2c_set_bus_speed(speed); + + /* + * Set our own address. + * Set slave address mode to 7 bit addressing mode + */ + i2c_clr_bit(&i2c_regs->cr, U8500_I2C_CR_SAM); + i2c_write_field(&i2c_regs->scr, U8500_I2C_SCR_ADDR, + U8500_I2C_SCR_SHIFT_ADDR, slaveaddr); + /* Slave Data Set up Time */ + i2c_write_field(&i2c_regs->scr, U8500_I2C_SCR_DATA_SETUP_TIME, + U8500_I2C_SCR_SHIFT_DATA_SETUP_TIME, SLAVE_SETUP_TIME); + + /* Disable the DMA sync logic */ + i2c_write_field(&i2c_regs->cr, U8500_I2C_CR_DMA_SLE, + U8500_I2C_CR_SHIFT_DMA_SLE, 0); + + /* Disable interrupts */ + writel(0, &i2c_regs->imscr); + + /* Configure bus master mode */ + i2c_write_field(&i2c_regs->cr, U8500_I2C_CR_OM, U8500_I2C_CR_SHIFT_OM, + U8500_I2C_BUS_MASTER_MODE); + /* Set FIFO threshold values */ + writel(TX_FIFO_THRESHOLD, &i2c_regs->tftr); + writel(RX_FIFO_THRESHOLD, &i2c_regs->rftr); + + /* Enable the I2C Controller */ + i2c_set_bit(&i2c_regs->cr, U8500_I2C_CR_PE); + + bus_initialized[i2c_bus_num] = 1; +} + + +/* + * loop_till_bit_clear - polls on a bit till it clears + * ioreg: register where you want to check status + * mask: bit mask for the bit you wish to check + * timeout: timeout in ticks/s + */ +static int loop_till_bit_clear(void *io_reg, u32 mask, unsigned long timeout) +{ + unsigned long timebase = get_timer(0); + + do { + if ((readl(io_reg) & mask) == 0x0UL) + return 0; + } while (get_timer(timebase) < timeout); + + debug("loop_till_bit_clear timed out\n"); + return -1; +} + +/* + * loop_till_bit_set - polls on a bit till it is set. + * ioreg: register where you want to check status + * mask: bit mask for the bit you wish to check + * timeout: timeout in ticks/s + */ +static int loop_till_bit_set(void *io_reg, u32 mask, unsigned long timeout) +{ + unsigned long timebase = get_timer(0); + + do { + if ((readl(io_reg) & mask) != 0x0UL) + return 0; + } while (get_timer(timebase) < timeout); + + debug("loop_till_bit_set timed out\n"); + return -1; +} + +/* + * flush_fifo - flush the I2C TX and RX FIFOs + */ +static void flush_fifo(struct u8500_i2c_regs *i2c_regs) +{ + int counter = U8500_I2C_FIFO_FLUSH_COUNTER; + + /* Flush Tx FIFO */ + i2c_set_bit(&i2c_regs->cr, U8500_I2C_CR_FTX); + /* Flush Rx FIFO */ + i2c_set_bit(&i2c_regs->cr, U8500_I2C_CR_FRX); + while (counter--) { + if (!(readl(&i2c_regs->cr) & + (U8500_I2C_CR_FTX | U8500_I2C_CR_FRX))) + break; + } + return; +} + +#ifdef DEBUG +static void print_abort_reason(struct u8500_i2c_regs *i2c_regs) +{ + int cause; + + printf("abort: risr %08x, sr %08x\n", i2c_regs->risr, i2c_regs->sr); + cause = (readl(&i2c_regs->sr) & U8500_I2C_SR_CAUSE) >> + U8500_I2C_SR_SHIFT_CAUSE; + switch (cause) { + case U8500_I2C_NACK_ADDR: + printf("No Ack received after Slave Address xmission\n"); + break; + case U8500_I2C_NACK_DATA: + printf("Valid for MASTER_WRITE: No Ack received " + "during data phase\n"); + break; + case U8500_I2C_ACK_MCODE: + printf("Master recv ack after xmission of master code" + "in hs mode\n"); + break; + case U8500_I2C_ARB_LOST: + printf("Master Lost arbitration\n"); + break; + case U8500_I2C_BERR_START: + printf("Slave restarts\n"); + break; + case U8500_I2C_BERR_STOP: + printf("Slave reset\n"); + break; + case U8500_I2C_OVFL: + printf("Overflow\n"); + break; + default: + printf("Unknown error type\n"); + } +} +#endif + +/* + * i2c_abort - called when a I2C transaction failed + */ +static void i2c_abort(struct u8500_i2c_regs *i2c_regs) +{ +#ifdef DEBUG + print_abort_reason(i2c_regs); +#endif + /* flush RX and TX fifos */ + flush_fifo(i2c_regs); + + /* Acknowledge the Master Transaction Done */ + i2c_set_bit(&i2c_regs->icr, U8500_I2C_INT_MTD); + + /* Acknowledge the Master Transaction Done Without Stop */ + i2c_set_bit(&i2c_regs->icr, U8500_I2C_INT_MTDWS); + + i2c_init(i2c_bus_speed[i2c_bus_num], CONFIG_SYS_I2C_SLAVE); +} + +/* + * write addr, alias index, to I2C bus. + */ +static int i2c_write_addr(struct u8500_i2c_regs *i2c_regs, uint addr, int alen) +{ + while (alen--) { + /* Wait until the Tx Fifo is not full */ + if (loop_till_bit_clear((void *)&i2c_regs->risr, + U8500_I2C_INT_TXFF, + U8500_I2C_ENDAD_COUNTER)) { + i2c_abort(i2c_regs); + return -1; + } + + /* MSB first */ + writeb((addr >> (alen * 8)) & 0xff, &i2c_regs->tfr); + } + + return 0; +} + +/* + * Internal simplified read function: + * i2c_regs: Pointer to I2C registers for current bus + * chip: I2C chip address, range 0..127 + * addr: Memory (register) address within the chip + * alen: Number of bytes to use for addr (typically 1, 2 for larger + * memories, 0 for register type devices with only one register) + * value: Where to put the data + * + * Returns: 0 on success, not 0 on failure + */ +static int i2c_read_byte(struct u8500_i2c_regs *i2c_regs, uchar chip, + uint addr, int alen, uchar *value) +{ + u32 mcr = 0; + + /* Set the address mode to 7 bit */ + WRITE_FIELD(mcr, U8500_I2C_MCR_AM, U8500_I2C_MCR_SHIFT_AM, 1); + + /* Store the slave address in the master control register */ + WRITE_FIELD(mcr, U8500_I2C_MCR_A7, U8500_I2C_MCR_SHIFT_A7, chip); + + if (alen != 0) { + /* Master write operation */ + mcr &= ~(U8500_I2C_MCR_OP); + + /* Configure the Frame length to one byte */ + WRITE_FIELD(mcr, U8500_I2C_MCR_LENGTH, + U8500_I2C_MCR_SHIFT_LENGTH, 1); + + /* Repeated start, no stop */ + mcr &= ~(U8500_I2C_MCR_STOP); + + /* Write Master Control Register */ + writel(mcr, &i2c_regs->mcr); + + /* send addr/index */ + if (i2c_write_addr(i2c_regs, addr, alen) != 0) + return -1; + + /* Check for the Master Transaction Done Without Stop */ + if (loop_till_bit_set((void *)&i2c_regs->risr, + U8500_I2C_INT_MTDWS, + U8500_I2C_ENDAD_COUNTER)) { + return -1; + } + + /* Acknowledge the Master Transaction Done Without Stop */ + i2c_set_bit(&i2c_regs->icr, U8500_I2C_INT_MTDWS); + } + + /* Master control configuration for read operation */ + mcr |= U8500_I2C_MCR_OP; + + /* Configure the STOP condition, we read only one byte */ + mcr |= U8500_I2C_MCR_STOP; + + /* Set the frame length to one byte, we support only 1 byte reads */ + WRITE_FIELD(mcr, U8500_I2C_MCR_LENGTH, U8500_I2C_MCR_SHIFT_LENGTH, 1); + + i2c_write_field(&i2c_regs->mcr, U8500_I2C_MCR_LENGTH_STOP_OP, + U8500_I2C_MCR_SHIFT_LENGTH_STOP_OP, mcr); + + /* + * receive_data_polling + */ + + /* Wait until the Rx FIFO is not empty */ + if (loop_till_bit_clear((void *)&i2c_regs->risr, + U8500_I2C_INT_RXFE, + U8500_I2C_ENDAD_COUNTER)) + return -1; + + /* Read the data byte from Rx FIFO */ + *value = readb(&i2c_regs->rfr); + + /* Wait until the work is done */ + if (loop_till_bit_set((void *)&i2c_regs->risr, U8500_I2C_INT_MTD, + U8500_I2C_ENDAD_COUNTER)) + return -1; + + /* Acknowledge the Master Transaction Done */ + i2c_set_bit(&i2c_regs->icr, U8500_I2C_INT_MTD); + + /* If MTD is set, Master Transaction Done Without Stop is set too */ + i2c_set_bit(&i2c_regs->icr, U8500_I2C_INT_MTDWS); + + return 0; +} + +/* + * Internal simplified write function: + * i2c_regs: Pointer to I2C registers for current bus + * chip: I2C chip address, range 0..127 + * addr: Memory (register) address within the chip + * alen: Number of bytes to use for addr (typically 1, 2 for larger + * memories, 0 for register type devices with only one register) + * data: Where to read the data + * len: How many bytes to write + * + * Returns: 0 on success, not 0 on failure + */ +static int __i2c_write(struct u8500_i2c_regs *i2c_regs, u8 chip, uint addr, + int alen, u8 *data, int len) +{ + int i; + u32 mcr = 0; + + /* Set the address mode to 7 bit */ + WRITE_FIELD(mcr, U8500_I2C_MCR_AM, U8500_I2C_MCR_SHIFT_AM, 1); + + /* Store the slave address in the master control register */ + WRITE_FIELD(mcr, U8500_I2C_MCR_A7, U8500_I2C_MCR_SHIFT_A7, chip); + + /* Write operation */ + mcr &= ~(U8500_I2C_MCR_OP); + + /* Current transaction is terminated by STOP condition */ + mcr |= U8500_I2C_MCR_STOP; + + /* Frame length: addr byte + len */ + WRITE_FIELD(mcr, U8500_I2C_MCR_LENGTH, U8500_I2C_MCR_SHIFT_LENGTH, + (alen + len)); + + /* Write MCR register */ + writel(mcr, &i2c_regs->mcr); + + if (i2c_write_addr(i2c_regs, addr, alen) != 0) + return -1; + + for (i = 0; i < len; i++) { + /* Wait until the Tx FIFO is not full */ + if (loop_till_bit_clear((void *)&i2c_regs->risr, + U8500_I2C_INT_TXFF, + U8500_I2C_ENDAD_COUNTER)) + return -1; + + /* it is a 32 bit register with upper 24 reserved R/O */ + writeb(data[i], &i2c_regs->tfr); + } + + /* Check for Master Transaction Done */ + if (loop_till_bit_set((void *)&i2c_regs->risr, + U8500_I2C_INT_MTD, + U8500_I2C_ENDAD_COUNTER)) { + printf("i2c_write_byte error2: risr %08x\n", + i2c_regs->risr); + return -1; + } + + /* Acknowledge Master Transaction Done */ + i2c_set_bit(&i2c_regs->icr, U8500_I2C_INT_MTD); + + /* Acknowledge Master Transaction Done Without Stop */ + i2c_set_bit(&i2c_regs->icr, U8500_I2C_INT_MTDWS); + + return 0; +} + +/* + * Probe the given I2C chip address. Returns 0 if a chip responded, + * not 0 on failure. + */ +int i2c_probe(uchar chip) +{ + u32 mcr = 0; + struct u8500_i2c_regs *i2c_regs; + + if (chip == CONFIG_SYS_I2C_SLAVE) + return 1; + + i2c_regs = i2c_dev[i2c_bus_num]; + + /* Set the address mode to 7 bit */ + WRITE_FIELD(mcr, U8500_I2C_MCR_AM, U8500_I2C_MCR_SHIFT_AM, 1); + + /* Store the slave address in the master control register */ + WRITE_FIELD(mcr, U8500_I2C_MCR_A10, U8500_I2C_MCR_SHIFT_A7, chip); + + /* Read operation */ + mcr |= U8500_I2C_MCR_OP; + + /* Set the frame length to one byte */ + WRITE_FIELD(mcr, U8500_I2C_MCR_LENGTH, U8500_I2C_MCR_SHIFT_LENGTH, 1); + + /* Current transaction is terminated by STOP condition */ + mcr |= U8500_I2C_MCR_STOP; + + /* Write MCR register */ + writel(mcr, &i2c_regs->mcr); + + /* Wait until the Rx Fifo is not empty */ + if (loop_till_bit_clear((void *)&i2c_regs->risr, + U8500_I2C_INT_RXFE, + U8500_I2C_ENDAD_COUNTER)) { + i2c_abort(i2c_regs); + return -1; + } + + flush_fifo(i2c_regs); + + /* Acknowledge the Master Transaction Done */ + i2c_set_bit(&i2c_regs->icr, U8500_I2C_INT_MTD); + + /* Acknowledge the Master Transaction Done Without Stop */ + i2c_set_bit(&i2c_regs->icr, U8500_I2C_INT_MTDWS); + + return 0; +} + +/* + * Read/Write interface: + * chip: I2C chip address, range 0..127 + * addr: Memory (register) address within the chip + * alen: Number of bytes to use for addr (typically 1, 2 for larger + * memories, 0 for register type devices with only one + * register) + * buffer: Where to read/write the data + * len: How many bytes to read/write + * + * Returns: 0 on success, not 0 on failure + */ +int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) +{ + int i; + int rc; + struct u8500_i2c_regs *i2c_regs; + + if (alen > 2) { + debug("I2C read: addr len %d not supported\n", alen); + return 1; + } + + i2c_regs = i2c_dev[i2c_bus_num]; + + for (i = 0; i < len; i++) { + rc = i2c_read_byte(i2c_regs, chip, addr + i, alen, &buffer[i]); + if (rc != 0) { + debug("I2C read: I/O error: %d\n", rc); + i2c_abort(i2c_regs); + return rc; + } + } + + return 0; +} + +int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) +{ + int rc; + struct u8500_i2c_regs *i2c_regs; + i2c_regs = i2c_dev[i2c_bus_num]; + + rc = __i2c_write(i2c_regs, chip, addr, alen, buffer, + len); + if (rc != 0) { + debug("I2C write: I/O error\n"); + i2c_abort(i2c_regs); + return rc; + } + return 0; +} + +int i2c_set_bus_num(unsigned int bus) +{ + if (bus > ARRAY_SIZE(i2c_dev) - 1) { + debug("i2c_set_bus_num: only up to bus %d supported\n", + ARRAY_SIZE(i2c_dev)-1); + return -1; + } + + i2c_bus_num = bus; + + if (!bus_initialized[i2c_bus_num]) + i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); + + return 0; +} + +int i2c_set_bus_speed(unsigned int speed) +{ + + if (speed > U8500_I2C_MAX_STANDARD_SCL) { + debug("i2c_set_bus_speed: only up to %d supported\n", + U8500_I2C_MAX_STANDARD_SCL); + return -1; + } + + /* sets as side effect i2c_bus_speed[i2c_bus_num] */ + i2c_init(speed, CONFIG_SYS_I2C_SLAVE); + + return 0; +} + +unsigned int i2c_get_bus_num(void) +{ + return i2c_bus_num; +} + +unsigned int i2c_get_bus_speed(void) +{ + return i2c_bus_speed[i2c_bus_num]; +} diff --git a/drivers/i2c/u8500_i2c.h b/drivers/i2c/u8500_i2c.h new file mode 100644 index 0000000..91dbd3e --- /dev/null +++ b/drivers/i2c/u8500_i2c.h @@ -0,0 +1,194 @@ +/* + * Copyright (C) ST-Ericsson SA 2009 + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef _U8500_I2C_H_ +#define _U8500_I2C_H_ + +#include <asm/types.h> +#include <asm/io.h> +#include <asm/errno.h> +#include <asm/arch/u8500.h> + +struct u8500_i2c_regs { + u32 cr; /* Control Register 0x00 */ + u32 scr; /* Slave Address Register 0x04 */ + u32 hsmcr; /* HS Master code Register 0x08 */ + u32 mcr; /* Master Control Register 0x0C */ + u32 tfr; /* Transmit Fifo Register 0x10 */ + u32 sr; /* Status Register 0x14 */ + u32 rfr; /* Receiver Fifo Register 0x18 */ + u32 tftr; /* Transmit Fifo Threshold Register 0x1C */ + u32 rftr; /* Receiver Fifo Threshold Register 0x20 */ + u32 dmar; /* DMA register 0x24 */ + u32 brcr; /* Baud Rate Counter Register 0x28 */ + u32 imscr; /* Interrupt Mask Set and Clear Register 0x2C */ + u32 risr; /* Raw interrupt status register 0x30 */ + u32 misr; /* Masked interrupt status register 0x34 */ + u32 icr; /* Interrupt Set and Clear Register 0x38 */ + u32 reserved_1[(0xFE0 - 0x3c) >> 2]; /* Reserved 0x03C to 0xFE0 */ + u32 periph_id_0; /* peripheral ID 0 0xFE0 */ + u32 periph_id_1; /* peripheral ID 1 0xFE4 */ + u32 periph_id_2; /* peripheral ID 2 0xFE8 */ + u32 periph_id_3; /* peripheral ID 3 0xFEC */ + u32 cell_id_0; /* I2C cell ID 0 0xFF0 */ + u32 cell_id_1; /* I2C cell ID 1 0xFF4 */ + u32 cell_id_2; /* I2C cell ID 2 0xFF8 */ + u32 cell_id_3; /* I2C cell ID 3 0xFFC */ +}; + + +/* Control Register */ + +/* Mask values for control register mask */ +#define U8500_I2C_CR_PE 0x0001 /* Peripheral enable */ +#define U8500_I2C_CR_OM 0x0006 /* Operation mode */ +#define U8500_I2C_CR_SAM 0x0008 /* Slave Addressing mode */ +#define U8500_I2C_CR_SM 0x0030 /* Speed mode */ +#define U8500_I2C_CR_SGCM 0x0040 /* Slave General call mode */ +#define U8500_I2C_CR_FTX 0x0080 /* Flush Transmit */ +#define U8500_I2C_CR_FRX 0x0100 /* Flush Receive */ +#define U8500_I2C_CR_DMA_TX_EN 0x0200 /* DMA TX Enable */ +#define U8500_I2C_CR_DMA_RX_EN 0x0400 /* DMA Rx Enable */ +#define U8500_I2C_CR_DMA_SLE 0x0800 /* DMA Synchronization Logic enable */ +#define U8500_I2C_CR_LM 0x1000 /* Loop back mode */ +#define U8500_I2C_CR_FON 0x6000 /* Filtering On */ + +/* shift valus for control register bit fields */ +#define U8500_I2C_CR_SHIFT_PE 0 /* Peripheral enable */ +#define U8500_I2C_CR_SHIFT_OM 1 /* Operation mode */ +#define U8500_I2C_CR_SHIFT_SAM 3 /* Slave Addressing mode */ +#define U8500_I2C_CR_SHIFT_SM 4 /* Speed mode */ +#define U8500_I2C_CR_SHIFT_SGCM 6 /* Slave General call mode */ +#define U8500_I2C_CR_SHIFT_FTX 7 /* Flush Transmit */ +#define U8500_I2C_CR_SHIFT_FRX 8 /* Flush Receive */ +#define U8500_I2C_CR_SHIFT_DMA_TX_EN 9 /* DMA TX Enable */ +#define U8500_I2C_CR_SHIFT_DMA_RX_EN 10 /* DMA Rx Enable */ +#define U8500_I2C_CR_SHIFT_DMA_SLE 11 /* DMA Synch Logic enable */ +#define U8500_I2C_CR_SHIFT_LM 12 /* Loop back mode */ +#define U8500_I2C_CR_SHIFT_FON 13 /* Filtering On */ + +/* bus operation modes */ +#define U8500_I2C_BUS_SLAVE_MODE 0 +#define U8500_I2C_BUS_MASTER_MODE 1 +#define U8500_I2C_BUS_MASTER_SLAVE_MODE 2 + + +/* Slave control register*/ + +/* Mask values slave control register */ +#define U8500_I2C_SCR_ADDR 0x3FF +#define U8500_I2C_SCR_DATA_SETUP_TIME 0xFFFF0000 + +/* Shift values for Slave control register */ +#define U8500_I2C_SCR_SHIFT_ADDR 0 +#define U8500_I2C_SCR_SHIFT_DATA_SETUP_TIME 16 + + +/* Master Control Register */ + +/* Mask values for Master control register */ +#define U8500_I2C_MCR_OP 0x00000001 /* Operation */ +#define U8500_I2C_MCR_A7 0x000000FE /* LSB bits of Address */ +#define U8500_I2C_MCR_EA10 0x00000700 /* Extended Address */ +#define U8500_I2C_MCR_SB 0x00000800 /* Start byte procedure */ +#define U8500_I2C_MCR_AM 0x00003000 /* Address type */ +#define U8500_I2C_MCR_STOP 0x00004000 /* stop condition */ +#define U8500_I2C_MCR_LENGTH 0x03FF8000 /* Frame length */ +#define U8500_I2C_MCR_A10 0x000007FE /* Enable 10 bit address */ +/* mask for length field,stop and operation */ +#define U8500_I2C_MCR_LENGTH_STOP_OP 0x3FFC001 + +/* Shift values for Master control values */ +#define U8500_I2C_MCR_SHIFT_OP 0 /* Operation */ +#define U8500_I2C_MCR_SHIFT_A7 1 /* LSB bits of Address */ +#define U8500_I2C_MCR_SHIFT_EA10 8 /* Extended Address */ +#define U8500_I2C_MCR_SHIFT_SB 11 /* Start byte procedure */ +#define U8500_I2C_MCR_SHIFT_AM 12 /* Address type */ +#define U8500_I2C_MCR_SHIFT_STOP 14 /* stop condition */ +#define U8500_I2C_MCR_SHIFT_LENGTH 15 /* Frame length */ +#define U8500_I2C_MCR_SHIFT_A10 1 /* Enable 10 bit address */ + +#define U8500_I2C_MCR_SHIFT_LENGTH_STOP_OP 0 + + +/* Status Register */ + +/* Mask values for Status register */ +#define U8500_I2C_SR_OP 0x00000003 /* Operation */ +#define U8500_I2C_SR_STATUS 0x0000000C /* Controller Status */ +#define U8500_I2C_SR_CAUSE 0x00000070 /* Abort Cause */ +#define U8500_I2C_SR_TYPE 0x00000180 /* Receive Type */ +#define U8500_I2C_SR_LENGTH 0x000FF700 /* Transfer length */ + +/* Shift values for Status register */ +#define U8500_I2C_SR_SHIFT_OP 0 /* Operation */ +#define U8500_I2C_SR_SHIFT_STATUS 2 /* Controller Status */ +#define U8500_I2C_SR_SHIFT_CAUSE 4 /* Abort Cause */ +#define U8500_I2C_SR_SHIFT_TYPE 7 /* Receive Type */ +#define U8500_I2C_SR_SHIFT_LENGTH 9 /* Transfer length */ + +/* abort cause */ +#define U8500_I2C_NACK_ADDR 0 +#define U8500_I2C_NACK_DATA 1 +#define U8500_I2C_ACK_MCODE 2 +#define U8500_I2C_ARB_LOST 3 +#define U8500_I2C_BERR_START 4 +#define U8500_I2C_BERR_STOP 5 +#define U8500_I2C_OVFL 6 + + +/* Baud rate counter registers */ + +/* Mask values for Baud rate counter register */ +#define U8500_I2C_BRCR_BRCNT2 0xFFFF /* Baud Rate Cntr BRCR for HS */ +#define U8500_I2C_BRCR_BRCNT1 0xFFFF0000 /* BRCR for Standard and Fast */ + +/* Shift values for the Baud rate counter register */ +#define U8500_I2C_BRCR_SHIFT_BRCNT2 0 +#define U8500_I2C_BRCR_SHIFT_BRCNT1 16 + + +/* Interrupt Register */ + +/* Mask values for Interrupt registers */ +#define U8500_I2C_INT_TXFE 0x00000001 /* Tx fifo empty */ +#define U8500_I2C_INT_TXFNE 0x00000002 /* Tx Fifo nearly empty */ +#define U8500_I2C_INT_TXFF 0x00000004 /* Tx Fifo Full */ +#define U8500_I2C_INT_TXFOVR 0x00000008 /* Tx Fifo over run */ +#define U8500_I2C_INT_RXFE 0x00000010 /* Rx Fifo Empty */ +#define U8500_I2C_INT_RXFNF 0x00000020 /* Rx Fifo nearly empty */ +#define U8500_I2C_INT_RXFF 0x00000040 /* Rx Fifo Full */ +#define U8500_I2C_INT_RFSR 0x00010000 /* Read From slave request */ +#define U8500_I2C_INT_RFSE 0x00020000 /* Read from slave empty */ +#define U8500_I2C_INT_WTSR 0x00040000 /* Write to Slave request */ +#define U8500_I2C_INT_MTD 0x00080000 /* Master Transcation Done*/ +#define U8500_I2C_INT_STD 0x00100000 /* Slave Transaction Done */ +#define U8500_I2C_INT_MAL 0x01000000 /* Master Arbitation Lost */ +#define U8500_I2C_INT_BERR 0x02000000 /* Bus Error */ +#define U8500_I2C_INT_MTDWS 0x10000000 /* Master Tran Done wo/ Stop */ + +/* Max clocks (Hz) */ +#define U8500_I2C_MAX_STANDARD_SCL 100000 +#define U8500_I2C_MAX_FAST_SCL 400000 +#define U8500_I2C_MAX_HIGH_SPEED_SCL 3400000 + +#endif /* _U8500_I2C_H_ */