Merge pull request #1534 from Icenowy/sun50i_h6_pmic
Add support for Allwinner H6 + X-Powers AXP805 PMIC combination
This commit is contained in:
commit
e636812dce
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@ -0,0 +1,28 @@
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/*
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* Copyright (C) 2018 Icenowy Zheng <icenowy@aosc.io>
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*
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* SPDX-License-Identifier: BSD-3-Clause
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* https://spdx.org/licenses
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*/
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/* This driver provides I2C support for Allwinner sunXi SoCs */
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#include <mmio.h>
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#define CONFIG_SYS_TCLK 24000000
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#define CONFIG_SYS_I2C_SPEED 100000
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#define CONFIG_SYS_I2C_SLAVE 0
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#define I2C_INTERRUPT_CLEAR_INVERTED
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struct mentor_i2c_regs {
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uint32_t slave_address;
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uint32_t xtnd_slave_addr;
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uint32_t data;
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uint32_t control;
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uint32_t status;
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uint32_t baudrate;
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uint32_t soft_reset;
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};
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#include "../mentor/i2c/mi2cv.c"
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@ -7,57 +7,22 @@
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/* This driver provides I2C support for Marvell A8K and compatible SoCs */
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#include <a8k_i2c.h>
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#include <debug.h>
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#include <delay_timer.h>
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#include <errno.h>
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#include <mmio.h>
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#include <mvebu_def.h>
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#if LOG_LEVEL >= LOG_LEVEL_VERBOSE
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#define DEBUG_I2C
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#endif
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#define CONFIG_SYS_TCLK 250000000
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#define CONFIG_SYS_I2C_SPEED 100000
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#define CONFIG_SYS_I2C_SLAVE 0x0
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#define I2C_TIMEOUT_VALUE 0x500
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#define I2C_MAX_RETRY_CNT 1000
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#define I2C_CMD_WRITE 0x0
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#define I2C_CMD_READ 0x1
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#define I2C_DATA_ADDR_7BIT_OFFS 0x1
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#define I2C_DATA_ADDR_7BIT_MASK (0xFF << I2C_DATA_ADDR_7BIT_OFFS)
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#define I2C_CAN_UNSTUCK
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#define I2C_CONTROL_ACK 0x00000004
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#define I2C_CONTROL_IFLG 0x00000008
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#define I2C_CONTROL_STOP 0x00000010
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#define I2C_CONTROL_START 0x00000020
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#define I2C_CONTROL_TWSIEN 0x00000040
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#define I2C_CONTROL_INTEN 0x00000080
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#define I2C_STATUS_START 0x08
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#define I2C_STATUS_REPEATED_START 0x10
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#define I2C_STATUS_ADDR_W_ACK 0x18
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#define I2C_STATUS_DATA_W_ACK 0x28
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#define I2C_STATUS_LOST_ARB_DATA_ADDR_TRANSFER 0x38
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#define I2C_STATUS_ADDR_R_ACK 0x40
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#define I2C_STATUS_DATA_R_ACK 0x50
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#define I2C_STATUS_DATA_R_NAK 0x58
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#define I2C_STATUS_LOST_ARB_GENERAL_CALL 0x78
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#define I2C_STATUS_IDLE 0xF8
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#define I2C_UNSTUCK_TRIGGER 0x1
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#define I2C_UNSTUCK_ONGOING 0x2
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#define I2C_UNSTUCK_ERROR 0x4
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struct marvell_i2c_regs {
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struct mentor_i2c_regs {
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uint32_t slave_address;
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uint32_t data;
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uint32_t control;
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union {
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uint32_t status; /* when reading */
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uint32_t baudrate; /* when writing */
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} u;
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};
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uint32_t xtnd_slave_addr;
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uint32_t reserved[2];
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uint32_t soft_reset;
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@ -65,549 +30,4 @@ struct marvell_i2c_regs {
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uint32_t unstuck;
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};
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static struct marvell_i2c_regs *base;
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static int marvell_i2c_lost_arbitration(uint32_t *status)
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{
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*status = mmio_read_32((uintptr_t)&base->u.status);
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if ((*status == I2C_STATUS_LOST_ARB_DATA_ADDR_TRANSFER) ||
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(*status == I2C_STATUS_LOST_ARB_GENERAL_CALL))
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return -EAGAIN;
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return 0;
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}
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static void marvell_i2c_interrupt_clear(void)
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{
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uint32_t reg;
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reg = mmio_read_32((uintptr_t)&base->control);
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reg &= ~(I2C_CONTROL_IFLG);
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mmio_write_32((uintptr_t)&base->control, reg);
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/* Wait for 1 us for the clear to take effect */
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udelay(1);
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}
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static int marvell_i2c_interrupt_get(void)
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{
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uint32_t reg;
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/* get the interrupt flag bit */
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reg = mmio_read_32((uintptr_t)&base->control);
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reg &= I2C_CONTROL_IFLG;
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return reg && I2C_CONTROL_IFLG;
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}
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static int marvell_i2c_wait_interrupt(void)
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{
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uint32_t timeout = 0;
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while (!marvell_i2c_interrupt_get() && (timeout++ < I2C_TIMEOUT_VALUE))
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;
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if (timeout >= I2C_TIMEOUT_VALUE)
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return -ETIMEDOUT;
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return 0;
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}
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static int marvell_i2c_start_bit_set(void)
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{
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int is_int_flag = 0;
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uint32_t status;
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if (marvell_i2c_interrupt_get())
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is_int_flag = 1;
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/* set start bit */
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mmio_write_32((uintptr_t)&base->control,
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mmio_read_32((uintptr_t)&base->control) |
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I2C_CONTROL_START);
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/* in case that the int flag was set before i.e. repeated start bit */
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if (is_int_flag) {
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VERBOSE("%s: repeated start Bit\n", __func__);
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marvell_i2c_interrupt_clear();
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}
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if (marvell_i2c_wait_interrupt()) {
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ERROR("Start clear bit timeout\n");
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return -ETIMEDOUT;
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}
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/* check that start bit went down */
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if ((mmio_read_32((uintptr_t)&base->control) &
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I2C_CONTROL_START) != 0) {
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ERROR("Start bit didn't went down\n");
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return -EPERM;
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}
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/* check the status */
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if (marvell_i2c_lost_arbitration(&status)) {
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ERROR("%s - %d: Lost arbitration, got status %x\n",
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__func__, __LINE__, status);
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return -EAGAIN;
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}
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if ((status != I2C_STATUS_START) &&
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(status != I2C_STATUS_REPEATED_START)) {
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ERROR("Got status %x after enable start bit.\n", status);
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return -EPERM;
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}
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return 0;
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}
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static int marvell_i2c_stop_bit_set(void)
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{
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int timeout;
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uint32_t status;
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/* Generate stop bit */
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mmio_write_32((uintptr_t)&base->control,
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mmio_read_32((uintptr_t)&base->control) |
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I2C_CONTROL_STOP);
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marvell_i2c_interrupt_clear();
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timeout = 0;
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/* Read control register, check the control stop bit */
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while ((mmio_read_32((uintptr_t)&base->control) & I2C_CONTROL_STOP) &&
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(timeout++ < I2C_TIMEOUT_VALUE))
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;
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if (timeout >= I2C_TIMEOUT_VALUE) {
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ERROR("Stop bit didn't went down\n");
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return -ETIMEDOUT;
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}
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/* check that stop bit went down */
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if ((mmio_read_32((uintptr_t)&base->control) & I2C_CONTROL_STOP) != 0) {
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ERROR("Stop bit didn't went down\n");
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return -EPERM;
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}
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/* check the status */
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if (marvell_i2c_lost_arbitration(&status)) {
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ERROR("%s - %d: Lost arbitration, got status %x\n",
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__func__, __LINE__, status);
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return -EAGAIN;
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}
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if (status != I2C_STATUS_IDLE) {
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ERROR("Got status %x after enable stop bit.\n", status);
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return -EPERM;
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}
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return 0;
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}
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static int marvell_i2c_address_set(uint8_t chain, int command)
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{
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uint32_t reg, status;
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reg = (chain << I2C_DATA_ADDR_7BIT_OFFS) & I2C_DATA_ADDR_7BIT_MASK;
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reg |= command;
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mmio_write_32((uintptr_t)&base->data, reg);
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udelay(1);
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marvell_i2c_interrupt_clear();
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if (marvell_i2c_wait_interrupt()) {
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ERROR("Start clear bit timeout\n");
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return -ETIMEDOUT;
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}
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/* check the status */
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if (marvell_i2c_lost_arbitration(&status)) {
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ERROR("%s - %d: Lost arbitration, got status %x\n",
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__func__, __LINE__, status);
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return -EAGAIN;
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}
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if (((status != I2C_STATUS_ADDR_R_ACK) && (command == I2C_CMD_READ)) ||
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((status != I2C_STATUS_ADDR_W_ACK) && (command == I2C_CMD_WRITE))) {
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/* only in debug, since in boot we try to read the SPD
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* of both DRAM, and we don't want error messages in cas
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* DIMM doesn't exist.
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*/
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INFO("%s: ERROR - status %x addr in %s mode.\n", __func__,
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status, (command == I2C_CMD_WRITE) ? "Write" : "Read");
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return -EPERM;
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}
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return 0;
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}
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/*
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* The I2C module contains a clock divider to generate the SCL clock.
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* This function calculates and sets the <N> and <M> fields in the I2C Baud
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* Rate Register (t=01) to obtain given 'requested_speed'.
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* The requested_speed will be equal to:
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* CONFIG_SYS_TCLK / (10 * (M + 1) * (2 << N))
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* Where M is the value represented by bits[6:3] and N is the value represented
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* by bits[2:0] of "I2C Baud Rate Register".
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* Therefore max M which can be set is 16 (2^4) and max N is 8 (2^3). So the
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* lowest possible baudrate is:
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* CONFIG_SYS_TCLK/(10 * (16 +1) * (2 << 8), which equals to:
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* CONFIG_SYS_TCLK/87040. Assuming that CONFIG_SYS_TCLK=250MHz, the lowest
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* possible frequency is ~2,872KHz.
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*/
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static unsigned int marvell_i2c_bus_speed_set(unsigned int requested_speed)
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{
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unsigned int n, m, freq, margin, min_margin = 0xffffffff;
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unsigned int actual_n = 0, actual_m = 0;
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int val;
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/* Calculate N and M for the TWSI clock baud rate */
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for (n = 0; n < 8; n++) {
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for (m = 0; m < 16; m++) {
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freq = CONFIG_SYS_TCLK / (10 * (m + 1) * (2 << n));
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val = requested_speed - freq;
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margin = (val > 0) ? val : -val;
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if ((freq <= requested_speed) &&
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(margin < min_margin)) {
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min_margin = margin;
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actual_n = n;
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actual_m = m;
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}
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}
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}
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VERBOSE("%s: actual_n = %u, actual_m = %u\n",
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__func__, actual_n, actual_m);
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/* Set the baud rate */
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mmio_write_32((uintptr_t)&base->u.baudrate, (actual_m << 3) | actual_n);
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return 0;
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}
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#ifdef DEBUG_I2C
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static int marvell_i2c_probe(uint8_t chip)
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{
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int ret = 0;
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ret = marvell_i2c_start_bit_set();
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if (ret != 0) {
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marvell_i2c_stop_bit_set();
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ERROR("%s - %d: %s", __func__, __LINE__,
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"marvell_i2c_start_bit_set failed\n");
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return -EPERM;
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}
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ret = marvell_i2c_address_set(chip, I2C_CMD_WRITE);
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if (ret != 0) {
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marvell_i2c_stop_bit_set();
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ERROR("%s - %d: %s", __func__, __LINE__,
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"marvell_i2c_address_set failed\n");
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return -EPERM;
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}
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marvell_i2c_stop_bit_set();
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VERBOSE("%s: successful I2C probe\n", __func__);
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return ret;
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}
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#endif
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/* regular i2c transaction */
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static int marvell_i2c_data_receive(uint8_t *p_block, uint32_t block_size)
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{
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uint32_t reg, status, block_size_read = block_size;
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/* Wait for cause interrupt */
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if (marvell_i2c_wait_interrupt()) {
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ERROR("Start clear bit timeout\n");
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return -ETIMEDOUT;
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}
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while (block_size_read) {
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if (block_size_read == 1) {
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reg = mmio_read_32((uintptr_t)&base->control);
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reg &= ~(I2C_CONTROL_ACK);
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mmio_write_32((uintptr_t)&base->control, reg);
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}
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marvell_i2c_interrupt_clear();
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if (marvell_i2c_wait_interrupt()) {
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ERROR("Start clear bit timeout\n");
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return -ETIMEDOUT;
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}
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/* check the status */
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if (marvell_i2c_lost_arbitration(&status)) {
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ERROR("%s - %d: Lost arbitration, got status %x\n",
|
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__func__, __LINE__, status);
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return -EAGAIN;
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}
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if ((status != I2C_STATUS_DATA_R_ACK) &&
|
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(block_size_read != 1)) {
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ERROR("Status %x in read transaction\n", status);
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return -EPERM;
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}
|
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if ((status != I2C_STATUS_DATA_R_NAK) &&
|
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(block_size_read == 1)) {
|
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ERROR("Status %x in Rd Terminate\n", status);
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return -EPERM;
|
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}
|
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|
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/* read the data */
|
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*p_block = (uint8_t) mmio_read_32((uintptr_t)&base->data);
|
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VERBOSE("%s: place %d read %x\n", __func__,
|
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block_size - block_size_read, *p_block);
|
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p_block++;
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block_size_read--;
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}
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return 0;
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}
|
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static int marvell_i2c_data_transmit(uint8_t *p_block, uint32_t block_size)
|
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{
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uint32_t status, block_size_write = block_size;
|
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if (marvell_i2c_wait_interrupt()) {
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ERROR("Start clear bit timeout\n");
|
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return -ETIMEDOUT;
|
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}
|
||||
|
||||
while (block_size_write) {
|
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/* write the data */
|
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mmio_write_32((uintptr_t)&base->data, (uint32_t) *p_block);
|
||||
VERBOSE("%s: index = %d, data = %x\n", __func__,
|
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block_size - block_size_write, *p_block);
|
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p_block++;
|
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block_size_write--;
|
||||
|
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marvell_i2c_interrupt_clear();
|
||||
|
||||
if (marvell_i2c_wait_interrupt()) {
|
||||
ERROR("Start clear bit timeout\n");
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
/* check the status */
|
||||
if (marvell_i2c_lost_arbitration(&status)) {
|
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ERROR("%s - %d: Lost arbitration, got status %x\n",
|
||||
__func__, __LINE__, status);
|
||||
return -EAGAIN;
|
||||
}
|
||||
if (status != I2C_STATUS_DATA_W_ACK) {
|
||||
ERROR("Status %x in write transaction\n", status);
|
||||
return -EPERM;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int marvell_i2c_target_offset_set(uint8_t chip, uint32_t addr, int alen)
|
||||
{
|
||||
uint8_t off_block[2];
|
||||
uint32_t off_size;
|
||||
|
||||
if (alen == 2) { /* 2-byte addresses support */
|
||||
off_block[0] = (addr >> 8) & 0xff;
|
||||
off_block[1] = addr & 0xff;
|
||||
off_size = 2;
|
||||
} else { /* 1-byte addresses support */
|
||||
off_block[0] = addr & 0xff;
|
||||
off_size = 1;
|
||||
}
|
||||
VERBOSE("%s: off_size = %x addr1 = %x addr2 = %x\n", __func__,
|
||||
off_size, off_block[0], off_block[1]);
|
||||
return marvell_i2c_data_transmit(off_block, off_size);
|
||||
}
|
||||
|
||||
static int marvell_i2c_unstuck(int ret)
|
||||
{
|
||||
uint32_t v;
|
||||
|
||||
if (ret != -ETIMEDOUT)
|
||||
return ret;
|
||||
VERBOSE("Trying to \"unstuck i2c\"... ");
|
||||
i2c_init(base);
|
||||
mmio_write_32((uintptr_t)&base->unstuck, I2C_UNSTUCK_TRIGGER);
|
||||
do {
|
||||
v = mmio_read_32((uintptr_t)&base->unstuck);
|
||||
} while (v & I2C_UNSTUCK_ONGOING);
|
||||
|
||||
if (v & I2C_UNSTUCK_ERROR) {
|
||||
VERBOSE("failed - soft reset i2c\n");
|
||||
ret = -EPERM;
|
||||
} else {
|
||||
VERBOSE("ok\n");
|
||||
i2c_init(base);
|
||||
ret = -EAGAIN;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* API Functions
|
||||
*/
|
||||
void i2c_init(void *i2c_base)
|
||||
{
|
||||
/* For I2C speed and slave address, now we do not set them since
|
||||
* we just provide the working speed and slave address in mvebu_def.h
|
||||
* for i2c_init
|
||||
*/
|
||||
base = (struct marvell_i2c_regs *)i2c_base;
|
||||
|
||||
/* Reset the I2C logic */
|
||||
mmio_write_32((uintptr_t)&base->soft_reset, 0);
|
||||
|
||||
udelay(200);
|
||||
|
||||
marvell_i2c_bus_speed_set(CONFIG_SYS_I2C_SPEED);
|
||||
|
||||
/* Enable the I2C and slave */
|
||||
mmio_write_32((uintptr_t)&base->control,
|
||||
I2C_CONTROL_TWSIEN | I2C_CONTROL_ACK);
|
||||
|
||||
/* set the I2C slave address */
|
||||
mmio_write_32((uintptr_t)&base->xtnd_slave_addr, 0);
|
||||
mmio_write_32((uintptr_t)&base->slave_address, CONFIG_SYS_I2C_SLAVE);
|
||||
|
||||
/* unmask I2C interrupt */
|
||||
mmio_write_32((uintptr_t)&base->control,
|
||||
mmio_read_32((uintptr_t)&base->control) |
|
||||
I2C_CONTROL_INTEN);
|
||||
|
||||
udelay(10);
|
||||
}
|
||||
|
||||
/*
|
||||
* i2c_read: - Read multiple bytes from an i2c device
|
||||
*
|
||||
* The higher level routines take into account that this function is only
|
||||
* called with len < page length of the device (see configuration file)
|
||||
*
|
||||
* @chip: address of the chip which is to be read
|
||||
* @addr: i2c data address within the chip
|
||||
* @alen: length of the i2c data address (1..2 bytes)
|
||||
* @buffer: where to write the data
|
||||
* @len: how much byte do we want to read
|
||||
* @return: 0 in case of success
|
||||
*/
|
||||
int i2c_read(uint8_t chip, uint32_t addr, int alen, uint8_t *buffer, int len)
|
||||
{
|
||||
int ret = 0;
|
||||
uint32_t counter = 0;
|
||||
|
||||
#ifdef DEBUG_I2C
|
||||
marvell_i2c_probe(chip);
|
||||
#endif
|
||||
|
||||
do {
|
||||
if (ret != -EAGAIN && ret) {
|
||||
ERROR("i2c transaction failed, after %d retries\n",
|
||||
counter);
|
||||
marvell_i2c_stop_bit_set();
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* wait for 1 us for the interrupt clear to take effect */
|
||||
if (counter > 0)
|
||||
udelay(1);
|
||||
counter++;
|
||||
|
||||
ret = marvell_i2c_start_bit_set();
|
||||
if (ret) {
|
||||
ret = marvell_i2c_unstuck(ret);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* if EEPROM device */
|
||||
if (alen != 0) {
|
||||
ret = marvell_i2c_address_set(chip, I2C_CMD_WRITE);
|
||||
if (ret)
|
||||
continue;
|
||||
|
||||
ret = marvell_i2c_target_offset_set(chip, addr, alen);
|
||||
if (ret)
|
||||
continue;
|
||||
ret = marvell_i2c_start_bit_set();
|
||||
if (ret)
|
||||
continue;
|
||||
}
|
||||
|
||||
ret = marvell_i2c_address_set(chip, I2C_CMD_READ);
|
||||
if (ret)
|
||||
continue;
|
||||
|
||||
ret = marvell_i2c_data_receive(buffer, len);
|
||||
if (ret)
|
||||
continue;
|
||||
|
||||
ret = marvell_i2c_stop_bit_set();
|
||||
} while ((ret == -EAGAIN) && (counter < I2C_MAX_RETRY_CNT));
|
||||
|
||||
if (counter == I2C_MAX_RETRY_CNT) {
|
||||
ERROR("I2C transactions failed, got EAGAIN %d times\n",
|
||||
I2C_MAX_RETRY_CNT);
|
||||
ret = -EPERM;
|
||||
}
|
||||
mmio_write_32((uintptr_t)&base->control,
|
||||
mmio_read_32((uintptr_t)&base->control) |
|
||||
I2C_CONTROL_ACK);
|
||||
|
||||
udelay(1);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* i2c_write: - Write multiple bytes to an i2c device
|
||||
*
|
||||
* The higher level routines take into account that this function is only
|
||||
* called with len < page length of the device (see configuration file)
|
||||
*
|
||||
* @chip: address of the chip which is to be written
|
||||
* @addr: i2c data address within the chip
|
||||
* @alen: length of the i2c data address (1..2 bytes)
|
||||
* @buffer: where to find the data to be written
|
||||
* @len: how much byte do we want to read
|
||||
* @return: 0 in case of success
|
||||
*/
|
||||
int i2c_write(uint8_t chip, uint32_t addr, int alen, uint8_t *buffer, int len)
|
||||
{
|
||||
int ret = 0;
|
||||
uint32_t counter = 0;
|
||||
|
||||
do {
|
||||
if (ret != -EAGAIN && ret) {
|
||||
ERROR("i2c transaction failed\n");
|
||||
marvell_i2c_stop_bit_set();
|
||||
return ret;
|
||||
}
|
||||
/* wait for 1 us for the interrupt clear to take effect */
|
||||
if (counter > 0)
|
||||
udelay(1);
|
||||
counter++;
|
||||
|
||||
ret = marvell_i2c_start_bit_set();
|
||||
if (ret) {
|
||||
ret = marvell_i2c_unstuck(ret);
|
||||
continue;
|
||||
}
|
||||
|
||||
ret = marvell_i2c_address_set(chip, I2C_CMD_WRITE);
|
||||
if (ret)
|
||||
continue;
|
||||
|
||||
/* if EEPROM device */
|
||||
if (alen != 0) {
|
||||
ret = marvell_i2c_target_offset_set(chip, addr, alen);
|
||||
if (ret)
|
||||
continue;
|
||||
}
|
||||
|
||||
ret = marvell_i2c_data_transmit(buffer, len);
|
||||
if (ret)
|
||||
continue;
|
||||
|
||||
ret = marvell_i2c_stop_bit_set();
|
||||
} while ((ret == -EAGAIN) && (counter < I2C_MAX_RETRY_CNT));
|
||||
|
||||
if (counter == I2C_MAX_RETRY_CNT) {
|
||||
ERROR("I2C transactions failed, got EAGAIN %d times\n",
|
||||
I2C_MAX_RETRY_CNT);
|
||||
ret = -EPERM;
|
||||
}
|
||||
|
||||
udelay(1);
|
||||
return ret;
|
||||
}
|
||||
#include "../../mentor/i2c/mi2cv.c"
|
||||
|
|
|
@ -0,0 +1,611 @@
|
|||
/*
|
||||
* Copyright (C) 2018 Marvell International Ltd.
|
||||
* Copyright (C) 2018 Icenowy Zheng <icenowy@aosc.io>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-3-Clause
|
||||
* https://spdx.org/licenses
|
||||
*/
|
||||
|
||||
/*
|
||||
* This driver is for Mentor Graphics Inventra MI2CV IP core, which is used
|
||||
* for Marvell and Allwinner SoCs in ATF.
|
||||
*/
|
||||
|
||||
#include <debug.h>
|
||||
#include <delay_timer.h>
|
||||
#include <errno.h>
|
||||
#include <mentor/mi2cv.h>
|
||||
#include <mmio.h>
|
||||
|
||||
#if LOG_LEVEL >= LOG_LEVEL_VERBOSE
|
||||
#define DEBUG_I2C
|
||||
#endif
|
||||
|
||||
#define I2C_TIMEOUT_VALUE 0x500
|
||||
#define I2C_MAX_RETRY_CNT 1000
|
||||
#define I2C_CMD_WRITE 0x0
|
||||
#define I2C_CMD_READ 0x1
|
||||
|
||||
#define I2C_DATA_ADDR_7BIT_OFFS 0x1
|
||||
#define I2C_DATA_ADDR_7BIT_MASK (0xFF << I2C_DATA_ADDR_7BIT_OFFS)
|
||||
|
||||
#define I2C_CONTROL_ACK 0x00000004
|
||||
#define I2C_CONTROL_IFLG 0x00000008
|
||||
#define I2C_CONTROL_STOP 0x00000010
|
||||
#define I2C_CONTROL_START 0x00000020
|
||||
#define I2C_CONTROL_TWSIEN 0x00000040
|
||||
#define I2C_CONTROL_INTEN 0x00000080
|
||||
|
||||
#define I2C_STATUS_START 0x08
|
||||
#define I2C_STATUS_REPEATED_START 0x10
|
||||
#define I2C_STATUS_ADDR_W_ACK 0x18
|
||||
#define I2C_STATUS_DATA_W_ACK 0x28
|
||||
#define I2C_STATUS_LOST_ARB_DATA_ADDR_TRANSFER 0x38
|
||||
#define I2C_STATUS_ADDR_R_ACK 0x40
|
||||
#define I2C_STATUS_DATA_R_ACK 0x50
|
||||
#define I2C_STATUS_DATA_R_NAK 0x58
|
||||
#define I2C_STATUS_LOST_ARB_GENERAL_CALL 0x78
|
||||
#define I2C_STATUS_IDLE 0xF8
|
||||
|
||||
#define I2C_UNSTUCK_TRIGGER 0x1
|
||||
#define I2C_UNSTUCK_ONGOING 0x2
|
||||
#define I2C_UNSTUCK_ERROR 0x4
|
||||
|
||||
static struct mentor_i2c_regs *base;
|
||||
|
||||
static int mentor_i2c_lost_arbitration(uint32_t *status)
|
||||
{
|
||||
*status = mmio_read_32((uintptr_t)&base->status);
|
||||
if ((*status == I2C_STATUS_LOST_ARB_DATA_ADDR_TRANSFER) ||
|
||||
(*status == I2C_STATUS_LOST_ARB_GENERAL_CALL))
|
||||
return -EAGAIN;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void mentor_i2c_interrupt_clear(void)
|
||||
{
|
||||
uint32_t reg;
|
||||
|
||||
reg = mmio_read_32((uintptr_t)&base->control);
|
||||
#ifndef I2C_INTERRUPT_CLEAR_INVERTED
|
||||
reg &= ~(I2C_CONTROL_IFLG);
|
||||
#else
|
||||
reg |= I2C_CONTROL_IFLG;
|
||||
#endif
|
||||
mmio_write_32((uintptr_t)&base->control, reg);
|
||||
/* Wait for 1 us for the clear to take effect */
|
||||
udelay(1);
|
||||
}
|
||||
|
||||
static int mentor_i2c_interrupt_get(void)
|
||||
{
|
||||
uint32_t reg;
|
||||
|
||||
/* get the interrupt flag bit */
|
||||
reg = mmio_read_32((uintptr_t)&base->control);
|
||||
reg &= I2C_CONTROL_IFLG;
|
||||
return reg && I2C_CONTROL_IFLG;
|
||||
}
|
||||
|
||||
static int mentor_i2c_wait_interrupt(void)
|
||||
{
|
||||
uint32_t timeout = 0;
|
||||
|
||||
while (!mentor_i2c_interrupt_get() && (timeout++ < I2C_TIMEOUT_VALUE))
|
||||
;
|
||||
if (timeout >= I2C_TIMEOUT_VALUE)
|
||||
return -ETIMEDOUT;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mentor_i2c_start_bit_set(void)
|
||||
{
|
||||
int is_int_flag = 0;
|
||||
uint32_t status;
|
||||
|
||||
if (mentor_i2c_interrupt_get())
|
||||
is_int_flag = 1;
|
||||
|
||||
/* set start bit */
|
||||
mmio_write_32((uintptr_t)&base->control,
|
||||
mmio_read_32((uintptr_t)&base->control) |
|
||||
I2C_CONTROL_START);
|
||||
|
||||
/* in case that the int flag was set before i.e. repeated start bit */
|
||||
if (is_int_flag) {
|
||||
VERBOSE("%s: repeated start Bit\n", __func__);
|
||||
mentor_i2c_interrupt_clear();
|
||||
}
|
||||
|
||||
if (mentor_i2c_wait_interrupt()) {
|
||||
ERROR("Start clear bit timeout\n");
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
/* check that start bit went down */
|
||||
if ((mmio_read_32((uintptr_t)&base->control) &
|
||||
I2C_CONTROL_START) != 0) {
|
||||
ERROR("Start bit didn't went down\n");
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
/* check the status */
|
||||
if (mentor_i2c_lost_arbitration(&status)) {
|
||||
ERROR("%s - %d: Lost arbitration, got status %x\n",
|
||||
__func__, __LINE__, status);
|
||||
return -EAGAIN;
|
||||
}
|
||||
if ((status != I2C_STATUS_START) &&
|
||||
(status != I2C_STATUS_REPEATED_START)) {
|
||||
ERROR("Got status %x after enable start bit.\n", status);
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mentor_i2c_stop_bit_set(void)
|
||||
{
|
||||
int timeout;
|
||||
uint32_t status;
|
||||
|
||||
/* Generate stop bit */
|
||||
mmio_write_32((uintptr_t)&base->control,
|
||||
mmio_read_32((uintptr_t)&base->control) |
|
||||
I2C_CONTROL_STOP);
|
||||
mentor_i2c_interrupt_clear();
|
||||
|
||||
timeout = 0;
|
||||
/* Read control register, check the control stop bit */
|
||||
while ((mmio_read_32((uintptr_t)&base->control) & I2C_CONTROL_STOP) &&
|
||||
(timeout++ < I2C_TIMEOUT_VALUE))
|
||||
;
|
||||
if (timeout >= I2C_TIMEOUT_VALUE) {
|
||||
ERROR("Stop bit didn't went down\n");
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
/* check that stop bit went down */
|
||||
if ((mmio_read_32((uintptr_t)&base->control) & I2C_CONTROL_STOP) != 0) {
|
||||
ERROR("Stop bit didn't went down\n");
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
/* check the status */
|
||||
if (mentor_i2c_lost_arbitration(&status)) {
|
||||
ERROR("%s - %d: Lost arbitration, got status %x\n",
|
||||
__func__, __LINE__, status);
|
||||
return -EAGAIN;
|
||||
}
|
||||
if (status != I2C_STATUS_IDLE) {
|
||||
ERROR("Got status %x after enable stop bit.\n", status);
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mentor_i2c_address_set(uint8_t chain, int command)
|
||||
{
|
||||
uint32_t reg, status;
|
||||
|
||||
reg = (chain << I2C_DATA_ADDR_7BIT_OFFS) & I2C_DATA_ADDR_7BIT_MASK;
|
||||
reg |= command;
|
||||
mmio_write_32((uintptr_t)&base->data, reg);
|
||||
udelay(1);
|
||||
|
||||
mentor_i2c_interrupt_clear();
|
||||
|
||||
if (mentor_i2c_wait_interrupt()) {
|
||||
ERROR("Start clear bit timeout\n");
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
/* check the status */
|
||||
if (mentor_i2c_lost_arbitration(&status)) {
|
||||
ERROR("%s - %d: Lost arbitration, got status %x\n",
|
||||
__func__, __LINE__, status);
|
||||
return -EAGAIN;
|
||||
}
|
||||
if (((status != I2C_STATUS_ADDR_R_ACK) && (command == I2C_CMD_READ)) ||
|
||||
((status != I2C_STATUS_ADDR_W_ACK) && (command == I2C_CMD_WRITE))) {
|
||||
/* only in debug, since in boot we try to read the SPD
|
||||
* of both DRAM, and we don't want error messages in cas
|
||||
* DIMM doesn't exist.
|
||||
*/
|
||||
INFO("%s: ERROR - status %x addr in %s mode.\n", __func__,
|
||||
status, (command == I2C_CMD_WRITE) ? "Write" : "Read");
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* The I2C module contains a clock divider to generate the SCL clock.
|
||||
* This function calculates and sets the <N> and <M> fields in the I2C Baud
|
||||
* Rate Register (t=01) to obtain given 'requested_speed'.
|
||||
* The requested_speed will be equal to:
|
||||
* CONFIG_SYS_TCLK / (10 * (M + 1) * (2 << N))
|
||||
* Where M is the value represented by bits[6:3] and N is the value represented
|
||||
* by bits[2:0] of "I2C Baud Rate Register".
|
||||
* Therefore max M which can be set is 16 (2^4) and max N is 8 (2^3). So the
|
||||
* lowest possible baudrate is:
|
||||
* CONFIG_SYS_TCLK/(10 * (16 +1) * (2 << 8), which equals to:
|
||||
* CONFIG_SYS_TCLK/87040. Assuming that CONFIG_SYS_TCLK=250MHz, the lowest
|
||||
* possible frequency is ~2,872KHz.
|
||||
*/
|
||||
static unsigned int mentor_i2c_bus_speed_set(unsigned int requested_speed)
|
||||
{
|
||||
unsigned int n, m, freq, margin, min_margin = 0xffffffff;
|
||||
unsigned int actual_n = 0, actual_m = 0;
|
||||
int val;
|
||||
|
||||
/* Calculate N and M for the TWSI clock baud rate */
|
||||
for (n = 0; n < 8; n++) {
|
||||
for (m = 0; m < 16; m++) {
|
||||
freq = CONFIG_SYS_TCLK / (10 * (m + 1) * (2 << n));
|
||||
val = requested_speed - freq;
|
||||
margin = (val > 0) ? val : -val;
|
||||
|
||||
if ((freq <= requested_speed) &&
|
||||
(margin < min_margin)) {
|
||||
min_margin = margin;
|
||||
actual_n = n;
|
||||
actual_m = m;
|
||||
}
|
||||
}
|
||||
}
|
||||
VERBOSE("%s: actual_n = %u, actual_m = %u\n",
|
||||
__func__, actual_n, actual_m);
|
||||
/* Set the baud rate */
|
||||
mmio_write_32((uintptr_t)&base->baudrate, (actual_m << 3) | actual_n);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef DEBUG_I2C
|
||||
static int mentor_i2c_probe(uint8_t chip)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
ret = mentor_i2c_start_bit_set();
|
||||
if (ret != 0) {
|
||||
mentor_i2c_stop_bit_set();
|
||||
ERROR("%s - %d: %s", __func__, __LINE__,
|
||||
"mentor_i2c_start_bit_set failed\n");
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
ret = mentor_i2c_address_set(chip, I2C_CMD_WRITE);
|
||||
if (ret != 0) {
|
||||
mentor_i2c_stop_bit_set();
|
||||
ERROR("%s - %d: %s", __func__, __LINE__,
|
||||
"mentor_i2c_address_set failed\n");
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
mentor_i2c_stop_bit_set();
|
||||
|
||||
VERBOSE("%s: successful I2C probe\n", __func__);
|
||||
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* regular i2c transaction */
|
||||
static int mentor_i2c_data_receive(uint8_t *p_block, uint32_t block_size)
|
||||
{
|
||||
uint32_t reg, status, block_size_read = block_size;
|
||||
|
||||
/* Wait for cause interrupt */
|
||||
if (mentor_i2c_wait_interrupt()) {
|
||||
ERROR("Start clear bit timeout\n");
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
while (block_size_read) {
|
||||
if (block_size_read == 1) {
|
||||
reg = mmio_read_32((uintptr_t)&base->control);
|
||||
reg &= ~(I2C_CONTROL_ACK);
|
||||
mmio_write_32((uintptr_t)&base->control, reg);
|
||||
}
|
||||
mentor_i2c_interrupt_clear();
|
||||
|
||||
if (mentor_i2c_wait_interrupt()) {
|
||||
ERROR("Start clear bit timeout\n");
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
/* check the status */
|
||||
if (mentor_i2c_lost_arbitration(&status)) {
|
||||
ERROR("%s - %d: Lost arbitration, got status %x\n",
|
||||
__func__, __LINE__, status);
|
||||
return -EAGAIN;
|
||||
}
|
||||
if ((status != I2C_STATUS_DATA_R_ACK) &&
|
||||
(block_size_read != 1)) {
|
||||
ERROR("Status %x in read transaction\n", status);
|
||||
return -EPERM;
|
||||
}
|
||||
if ((status != I2C_STATUS_DATA_R_NAK) &&
|
||||
(block_size_read == 1)) {
|
||||
ERROR("Status %x in Rd Terminate\n", status);
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
/* read the data */
|
||||
*p_block = (uint8_t) mmio_read_32((uintptr_t)&base->data);
|
||||
VERBOSE("%s: place %d read %x\n", __func__,
|
||||
block_size - block_size_read, *p_block);
|
||||
p_block++;
|
||||
block_size_read--;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mentor_i2c_data_transmit(uint8_t *p_block, uint32_t block_size)
|
||||
{
|
||||
uint32_t status, block_size_write = block_size;
|
||||
|
||||
if (mentor_i2c_wait_interrupt()) {
|
||||
ERROR("Start clear bit timeout\n");
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
while (block_size_write) {
|
||||
/* write the data */
|
||||
mmio_write_32((uintptr_t)&base->data, (uint32_t) *p_block);
|
||||
VERBOSE("%s: index = %d, data = %x\n", __func__,
|
||||
block_size - block_size_write, *p_block);
|
||||
p_block++;
|
||||
block_size_write--;
|
||||
|
||||
mentor_i2c_interrupt_clear();
|
||||
|
||||
if (mentor_i2c_wait_interrupt()) {
|
||||
ERROR("Start clear bit timeout\n");
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
/* check the status */
|
||||
if (mentor_i2c_lost_arbitration(&status)) {
|
||||
ERROR("%s - %d: Lost arbitration, got status %x\n",
|
||||
__func__, __LINE__, status);
|
||||
return -EAGAIN;
|
||||
}
|
||||
if (status != I2C_STATUS_DATA_W_ACK) {
|
||||
ERROR("Status %x in write transaction\n", status);
|
||||
return -EPERM;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mentor_i2c_target_offset_set(uint8_t chip, uint32_t addr, int alen)
|
||||
{
|
||||
uint8_t off_block[2];
|
||||
uint32_t off_size;
|
||||
|
||||
if (alen == 2) { /* 2-byte addresses support */
|
||||
off_block[0] = (addr >> 8) & 0xff;
|
||||
off_block[1] = addr & 0xff;
|
||||
off_size = 2;
|
||||
} else { /* 1-byte addresses support */
|
||||
off_block[0] = addr & 0xff;
|
||||
off_size = 1;
|
||||
}
|
||||
VERBOSE("%s: off_size = %x addr1 = %x addr2 = %x\n", __func__,
|
||||
off_size, off_block[0], off_block[1]);
|
||||
return mentor_i2c_data_transmit(off_block, off_size);
|
||||
}
|
||||
|
||||
#ifdef I2C_CAN_UNSTUCK
|
||||
static int mentor_i2c_unstuck(int ret)
|
||||
{
|
||||
uint32_t v;
|
||||
|
||||
if (ret != -ETIMEDOUT)
|
||||
return ret;
|
||||
VERBOSE("Trying to \"unstuck i2c\"... ");
|
||||
i2c_init(base);
|
||||
mmio_write_32((uintptr_t)&base->unstuck, I2C_UNSTUCK_TRIGGER);
|
||||
do {
|
||||
v = mmio_read_32((uintptr_t)&base->unstuck);
|
||||
} while (v & I2C_UNSTUCK_ONGOING);
|
||||
|
||||
if (v & I2C_UNSTUCK_ERROR) {
|
||||
VERBOSE("failed - soft reset i2c\n");
|
||||
ret = -EPERM;
|
||||
} else {
|
||||
VERBOSE("ok\n");
|
||||
i2c_init(base);
|
||||
ret = -EAGAIN;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
#else
|
||||
static int mentor_i2c_unstuck(int ret)
|
||||
{
|
||||
VERBOSE("Cannot \"unstuck i2c\" - soft reset i2c\n");
|
||||
return -EPERM;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* API Functions
|
||||
*/
|
||||
void i2c_init(void *i2c_base)
|
||||
{
|
||||
/* For I2C speed and slave address, now we do not set them since
|
||||
* we just provide the working speed and slave address otherwhere
|
||||
* for i2c_init
|
||||
*/
|
||||
base = (struct mentor_i2c_regs *)i2c_base;
|
||||
|
||||
/* Reset the I2C logic */
|
||||
mmio_write_32((uintptr_t)&base->soft_reset, 0);
|
||||
|
||||
udelay(200);
|
||||
|
||||
mentor_i2c_bus_speed_set(CONFIG_SYS_I2C_SPEED);
|
||||
|
||||
/* Enable the I2C and slave */
|
||||
mmio_write_32((uintptr_t)&base->control,
|
||||
I2C_CONTROL_TWSIEN | I2C_CONTROL_ACK);
|
||||
|
||||
/* set the I2C slave address */
|
||||
mmio_write_32((uintptr_t)&base->xtnd_slave_addr, 0);
|
||||
mmio_write_32((uintptr_t)&base->slave_address, CONFIG_SYS_I2C_SLAVE);
|
||||
|
||||
/* unmask I2C interrupt */
|
||||
mmio_write_32((uintptr_t)&base->control,
|
||||
mmio_read_32((uintptr_t)&base->control) |
|
||||
I2C_CONTROL_INTEN);
|
||||
|
||||
udelay(10);
|
||||
}
|
||||
|
||||
/*
|
||||
* i2c_read: - Read multiple bytes from an i2c device
|
||||
*
|
||||
* The higher level routines take into account that this function is only
|
||||
* called with len < page length of the device (see configuration file)
|
||||
*
|
||||
* @chip: address of the chip which is to be read
|
||||
* @addr: i2c data address within the chip
|
||||
* @alen: length of the i2c data address (1..2 bytes)
|
||||
* @buffer: where to write the data
|
||||
* @len: how much byte do we want to read
|
||||
* @return: 0 in case of success
|
||||
*/
|
||||
int i2c_read(uint8_t chip, uint32_t addr, int alen, uint8_t *buffer, int len)
|
||||
{
|
||||
int ret = 0;
|
||||
uint32_t counter = 0;
|
||||
|
||||
#ifdef DEBUG_I2C
|
||||
mentor_i2c_probe(chip);
|
||||
#endif
|
||||
|
||||
do {
|
||||
if (ret != -EAGAIN && ret) {
|
||||
ERROR("i2c transaction failed, after %d retries\n",
|
||||
counter);
|
||||
mentor_i2c_stop_bit_set();
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* wait for 1 us for the interrupt clear to take effect */
|
||||
if (counter > 0)
|
||||
udelay(1);
|
||||
counter++;
|
||||
|
||||
ret = mentor_i2c_start_bit_set();
|
||||
if (ret) {
|
||||
ret = mentor_i2c_unstuck(ret);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* if EEPROM device */
|
||||
if (alen != 0) {
|
||||
ret = mentor_i2c_address_set(chip, I2C_CMD_WRITE);
|
||||
if (ret)
|
||||
continue;
|
||||
|
||||
ret = mentor_i2c_target_offset_set(chip, addr, alen);
|
||||
if (ret)
|
||||
continue;
|
||||
ret = mentor_i2c_start_bit_set();
|
||||
if (ret)
|
||||
continue;
|
||||
}
|
||||
|
||||
ret = mentor_i2c_address_set(chip, I2C_CMD_READ);
|
||||
if (ret)
|
||||
continue;
|
||||
|
||||
ret = mentor_i2c_data_receive(buffer, len);
|
||||
if (ret)
|
||||
continue;
|
||||
|
||||
ret = mentor_i2c_stop_bit_set();
|
||||
} while ((ret == -EAGAIN) && (counter < I2C_MAX_RETRY_CNT));
|
||||
|
||||
if (counter == I2C_MAX_RETRY_CNT) {
|
||||
ERROR("I2C transactions failed, got EAGAIN %d times\n",
|
||||
I2C_MAX_RETRY_CNT);
|
||||
ret = -EPERM;
|
||||
}
|
||||
mmio_write_32((uintptr_t)&base->control,
|
||||
mmio_read_32((uintptr_t)&base->control) |
|
||||
I2C_CONTROL_ACK);
|
||||
|
||||
udelay(1);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* i2c_write: - Write multiple bytes to an i2c device
|
||||
*
|
||||
* The higher level routines take into account that this function is only
|
||||
* called with len < page length of the device (see configuration file)
|
||||
*
|
||||
* @chip: address of the chip which is to be written
|
||||
* @addr: i2c data address within the chip
|
||||
* @alen: length of the i2c data address (1..2 bytes)
|
||||
* @buffer: where to find the data to be written
|
||||
* @len: how much byte do we want to read
|
||||
* @return: 0 in case of success
|
||||
*/
|
||||
int i2c_write(uint8_t chip, uint32_t addr, int alen, uint8_t *buffer, int len)
|
||||
{
|
||||
int ret = 0;
|
||||
uint32_t counter = 0;
|
||||
|
||||
do {
|
||||
if (ret != -EAGAIN && ret) {
|
||||
ERROR("i2c transaction failed\n");
|
||||
mentor_i2c_stop_bit_set();
|
||||
return ret;
|
||||
}
|
||||
/* wait for 1 us for the interrupt clear to take effect */
|
||||
if (counter > 0)
|
||||
udelay(1);
|
||||
counter++;
|
||||
|
||||
ret = mentor_i2c_start_bit_set();
|
||||
if (ret) {
|
||||
ret = mentor_i2c_unstuck(ret);
|
||||
continue;
|
||||
}
|
||||
|
||||
ret = mentor_i2c_address_set(chip, I2C_CMD_WRITE);
|
||||
if (ret)
|
||||
continue;
|
||||
|
||||
/* if EEPROM device */
|
||||
if (alen != 0) {
|
||||
ret = mentor_i2c_target_offset_set(chip, addr, alen);
|
||||
if (ret)
|
||||
continue;
|
||||
}
|
||||
|
||||
ret = mentor_i2c_data_transmit(buffer, len);
|
||||
if (ret)
|
||||
continue;
|
||||
|
||||
ret = mentor_i2c_stop_bit_set();
|
||||
} while ((ret == -EAGAIN) && (counter < I2C_MAX_RETRY_CNT));
|
||||
|
||||
if (counter == I2C_MAX_RETRY_CNT) {
|
||||
ERROR("I2C transactions failed, got EAGAIN %d times\n",
|
||||
I2C_MAX_RETRY_CNT);
|
||||
ret = -EPERM;
|
||||
}
|
||||
|
||||
udelay(1);
|
||||
return ret;
|
||||
}
|
|
@ -1,14 +1,15 @@
|
|||
/*
|
||||
* Copyright (C) 2018 Marvell International Ltd.
|
||||
* Copyright (C) 2018 Icenowy Zheng <icenowy@aosc.io>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-3-Clause
|
||||
* https://spdx.org/licenses
|
||||
*/
|
||||
|
||||
/* This driver provides I2C support for Marvell A8K and compatible SoCs */
|
||||
/* This driver provides support for Mentor Graphics MI2CV IP core */
|
||||
|
||||
#ifndef _A8K_I2C_H_
|
||||
#define _A8K_I2C_H_
|
||||
#ifndef _MI2CV_H_
|
||||
#define _MI2CV_H_
|
||||
|
||||
#include <stdint.h>
|
||||
|
|
@ -24,6 +24,7 @@ Allwinner ARMv8 platform port
|
|||
:G: `smaeul`_
|
||||
:F: docs/plat/allwinner.rst
|
||||
:F: plat/allwinner/
|
||||
:F: drivers/allwinner/
|
||||
|
||||
Armv7-A architecture port
|
||||
-------------------------
|
||||
|
|
|
@ -93,6 +93,8 @@ void bl31_platform_setup(void)
|
|||
|
||||
sunxi_security_setup();
|
||||
|
||||
sunxi_pmic_setup();
|
||||
|
||||
INFO("BL31: Platform setup done\n");
|
||||
}
|
||||
|
||||
|
|
|
@ -54,9 +54,7 @@ static void __dead2 sunxi_system_off(void)
|
|||
/* Turn off all secondary CPUs */
|
||||
sunxi_disable_secondary_cpus(plat_my_core_pos());
|
||||
|
||||
ERROR("PSCI: Full shutdown not implemented, halting\n");
|
||||
wfi();
|
||||
panic();
|
||||
sunxi_power_down();
|
||||
}
|
||||
|
||||
static void __dead2 sunxi_system_reset(void)
|
||||
|
|
|
@ -13,6 +13,10 @@ void sunxi_cpu_on(unsigned int cluster, unsigned int core);
|
|||
void sunxi_disable_secondary_cpus(unsigned int primary_cpu);
|
||||
|
||||
uint16_t sunxi_read_soc_id(void);
|
||||
|
||||
void sunxi_pmic_setup(void);
|
||||
void sunxi_security_setup(void);
|
||||
|
||||
void __dead2 sunxi_power_down(void);
|
||||
|
||||
#endif /* __SUNXI_PRIVATE_H__ */
|
||||
|
|
|
@ -30,6 +30,7 @@ BL31_SOURCES += drivers/arm/gic/common/gic_common.c \
|
|||
${AW_PLAT}/common/sunxi_bl31_setup.c \
|
||||
${AW_PLAT}/common/sunxi_cpu_ops.c \
|
||||
${AW_PLAT}/common/sunxi_pm.c \
|
||||
${AW_PLAT}/sun50i_a64/sunxi_power.c \
|
||||
${AW_PLAT}/common/sunxi_security.c \
|
||||
${AW_PLAT}/common/sunxi_topology.c
|
||||
|
||||
|
|
|
@ -0,0 +1,24 @@
|
|||
/*
|
||||
* Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
|
||||
* Copyright (c) 2018, Icenowy Zheng <icenowy@aosc.io>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-3-Clause
|
||||
*/
|
||||
|
||||
#include <arch_helpers.h>
|
||||
#include <debug.h>
|
||||
|
||||
int sunxi_pmic_setup(void)
|
||||
{
|
||||
/* STUB */
|
||||
NOTICE("BL31: STUB PMIC setup code called\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void __dead2 sunxi_power_down(void)
|
||||
{
|
||||
ERROR("PSCI: Full shutdown not implemented, halting\n");
|
||||
wfi();
|
||||
panic();
|
||||
}
|
|
@ -7,6 +7,7 @@
|
|||
include lib/xlat_tables_v2/xlat_tables.mk
|
||||
|
||||
AW_PLAT := plat/allwinner
|
||||
AW_DRIVERS := drivers/allwinner
|
||||
|
||||
PLAT_INCLUDES := -Iinclude/plat/arm/common \
|
||||
-Iinclude/plat/arm/common/aarch64 \
|
||||
|
@ -15,6 +16,7 @@ PLAT_INCLUDES := -Iinclude/plat/arm/common \
|
|||
|
||||
PLAT_BL_COMMON_SOURCES := drivers/console/${ARCH}/console.S \
|
||||
drivers/ti/uart/${ARCH}/16550_console.S \
|
||||
${AW_DRIVERS}/sunxi_i2c.c \
|
||||
${XLAT_TABLES_LIB_SRCS} \
|
||||
${AW_PLAT}/common/plat_helpers.S \
|
||||
${AW_PLAT}/common/sunxi_common.c
|
||||
|
@ -30,6 +32,7 @@ BL31_SOURCES += drivers/arm/gic/common/gic_common.c \
|
|||
${AW_PLAT}/common/sunxi_bl31_setup.c \
|
||||
${AW_PLAT}/common/sunxi_cpu_ops.c \
|
||||
${AW_PLAT}/common/sunxi_pm.c \
|
||||
${AW_PLAT}/sun50i_h6/sunxi_power.c \
|
||||
${AW_PLAT}/common/sunxi_security.c \
|
||||
${AW_PLAT}/common/sunxi_topology.c
|
||||
|
||||
|
|
|
@ -0,0 +1,143 @@
|
|||
/*
|
||||
* Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
|
||||
* Copyright (c) 2018, Icenowy Zheng <icenowy@aosc.io>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-3-Clause
|
||||
*/
|
||||
|
||||
#include <arch_helpers.h>
|
||||
#include <debug.h>
|
||||
#include <delay_timer.h>
|
||||
#include <errno.h>
|
||||
#include <mmio.h>
|
||||
#include <mentor/mi2cv.h>
|
||||
#include <string.h>
|
||||
#include <sunxi_mmap.h>
|
||||
|
||||
#define AXP805_ADDR 0x36
|
||||
#define AXP805_ID 0x03
|
||||
|
||||
enum pmic_type {
|
||||
NO_PMIC,
|
||||
AXP805,
|
||||
};
|
||||
|
||||
enum pmic_type pmic;
|
||||
|
||||
static int sunxi_init_r_i2c(void)
|
||||
{
|
||||
uint32_t reg;
|
||||
|
||||
/* get currently configured function for pins PL0 and PL1 */
|
||||
reg = mmio_read_32(SUNXI_R_PIO_BASE + 0x00);
|
||||
if ((reg & 0xff) == 0x33) {
|
||||
NOTICE("PMIC: already configured for TWI\n");
|
||||
}
|
||||
|
||||
/* switch pins PL0 and PL1 to I2C */
|
||||
mmio_write_32(SUNXI_R_PIO_BASE + 0x00, (reg & ~0xff) | 0x33);
|
||||
|
||||
/* level 2 drive strength */
|
||||
reg = mmio_read_32(SUNXI_R_PIO_BASE + 0x14);
|
||||
mmio_write_32(SUNXI_R_PIO_BASE + 0x14, (reg & ~0x0f) | 0xa);
|
||||
|
||||
/* set both ports to pull-up */
|
||||
reg = mmio_read_32(SUNXI_R_PIO_BASE + 0x1c);
|
||||
mmio_write_32(SUNXI_R_PIO_BASE + 0x1c, (reg & ~0x0f) | 0x5);
|
||||
|
||||
/* assert & de-assert reset of R_I2C */
|
||||
reg = mmio_read_32(SUNXI_R_PRCM_BASE + 0x19c);
|
||||
mmio_write_32(SUNXI_R_PRCM_BASE + 0x19c, 0);
|
||||
reg = mmio_read_32(SUNXI_R_PRCM_BASE + 0x19c);
|
||||
mmio_write_32(SUNXI_R_PRCM_BASE + 0x19c, reg | 0x00010000);
|
||||
|
||||
/* un-gate R_I2C clock */
|
||||
reg = mmio_read_32(SUNXI_R_PRCM_BASE + 0x19c);
|
||||
mmio_write_32(SUNXI_R_PRCM_BASE + 0x19c, reg | 0x00000001);
|
||||
|
||||
/* call mi2cv driver */
|
||||
i2c_init((void *)SUNXI_R_I2C_BASE);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int axp_i2c_read(uint8_t chip, uint8_t reg, uint8_t *val)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = i2c_write(chip, 0, 0, ®, 1);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return i2c_read(chip, 0, 0, val, 1);
|
||||
}
|
||||
|
||||
int axp_i2c_write(uint8_t chip, uint8_t reg, uint8_t val)
|
||||
{
|
||||
return i2c_write(chip, reg, 1, &val, 1);
|
||||
}
|
||||
|
||||
static int axp805_probe(void)
|
||||
{
|
||||
int ret;
|
||||
uint8_t val;
|
||||
|
||||
ret = axp_i2c_write(AXP805_ADDR, 0xff, 0x0);
|
||||
if (ret) {
|
||||
ERROR("PMIC: Cannot put AXP805 to master mode.\n");
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
ret = axp_i2c_read(AXP805_ADDR, AXP805_ID, &val);
|
||||
|
||||
if (!ret && ((val & 0xcf) == 0x40))
|
||||
NOTICE("PMIC: AXP805 detected\n");
|
||||
else if (ret) {
|
||||
ERROR("PMIC: Cannot communicate with AXP805.\n");
|
||||
return -EPERM;
|
||||
} else {
|
||||
ERROR("PMIC: Non-AXP805 chip attached at AXP805's address.\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int sunxi_pmic_setup(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
sunxi_init_r_i2c();
|
||||
|
||||
NOTICE("PMIC: Probing AXP805\n");
|
||||
pmic = AXP805;
|
||||
|
||||
ret = axp805_probe();
|
||||
if (ret)
|
||||
pmic = NO_PMIC;
|
||||
else
|
||||
pmic = AXP805;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void __dead2 sunxi_power_down(void)
|
||||
{
|
||||
uint8_t val;
|
||||
|
||||
switch (pmic) {
|
||||
case AXP805:
|
||||
val = 0x26; /* Default value for REG 32H */
|
||||
axp_i2c_read(AXP805_ADDR, 0x32, &val);
|
||||
val |= 0x80;
|
||||
axp_i2c_write(AXP805_ADDR, 0x32, val);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
udelay(1000);
|
||||
ERROR("PSCI: Cannot communicate with PMIC, halting\n");
|
||||
wfi();
|
||||
panic();
|
||||
}
|
|
@ -6,8 +6,8 @@
|
|||
*/
|
||||
|
||||
#include <arch_helpers.h>
|
||||
#include <a8k_i2c.h>
|
||||
#include <debug.h>
|
||||
#include <mentor/mi2cv.h>
|
||||
#include <mmio.h>
|
||||
#include <mv_ddr_if.h>
|
||||
#include <mvebu_def.h>
|
||||
|
|
|
@ -6,8 +6,8 @@
|
|||
*/
|
||||
|
||||
#include <arch_helpers.h>
|
||||
#include <a8k_i2c.h>
|
||||
#include <debug.h>
|
||||
#include <mentor/mi2cv.h>
|
||||
#include <mmio.h>
|
||||
#include <mv_ddr_if.h>
|
||||
#include <mvebu_def.h>
|
||||
|
|
Loading…
Reference in New Issue