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Diffstat (limited to 'src/soc/intel/quark/i2c.c')
-rw-r--r--src/soc/intel/quark/i2c.c357
1 files changed, 0 insertions, 357 deletions
diff --git a/src/soc/intel/quark/i2c.c b/src/soc/intel/quark/i2c.c
deleted file mode 100644
index 42ca25dbd9..0000000000
--- a/src/soc/intel/quark/i2c.c
+++ /dev/null
@@ -1,357 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-
-#include <assert.h>
-#include <commonlib/helpers.h>
-#include <console/console.h>
-#include <delay.h>
-#include <device/device.h>
-#include <device/i2c_simple.h>
-#include <device/pci.h>
-#include <soc/i2c.h>
-#include <soc/ramstage.h>
-#include <soc/reg_access.h>
-#include <timer.h>
-
-static void i2c_disable(I2C_REGS *regs)
-{
- uint32_t status;
- uint32_t timeout;
-
- /* Disable I2C controller */
- regs->ic_enable = 0;
-
- /* Wait for the enable bit to clear */
- timeout = 1 * 1000 * 1000;
- status = regs->ic_enable_status;
- while (status & IC_ENABLE_CONTROLLER) {
- udelay(1);
- if (--timeout == 0)
- die_with_post_code(POST_HW_INIT_FAILURE,
- "ERROR - I2C failed to disable!\n");
- status = regs->ic_enable_status;
- }
-
- /* Clear any pending interrupts */
- status = regs->ic_clr_intr;
-}
-
-static int platform_i2c_write(uint32_t restart, uint8_t *tx_buffer, int length,
- uint32_t stop, uint8_t *rx_buffer, struct stopwatch *timeout)
-{
- int bytes_transferred;
- uint32_t cmd;
- I2C_REGS *regs;
- uint32_t status;
-
- ASSERT(tx_buffer != NULL);
- ASSERT(timeout != NULL);
- regs = get_i2c_address();
-
- /* Fill the FIFO with the write operation */
- bytes_transferred = 0;
- do {
- status = regs->ic_raw_intr_stat;
-
- /* Check for errors */
- if (status & (IC_INTR_RX_OVER | IC_INTR_RX_UNDER
- | IC_INTR_TX_ABRT | IC_INTR_TX_OVER)) {
- i2c_disable(regs);
- if (CONFIG(I2C_DEBUG))
- printk(BIOS_ERR,
- "0x%08x: ic_raw_intr_stat, I2C write error!\n",
- status);
- return -1;
- }
-
- /* Check for timeout */
- if (stopwatch_expired(timeout)) {
- if (CONFIG(I2C_DEBUG))
- printk(BIOS_ERR,
- "0x%08x: ic_raw_intr_stat, I2C write timeout!\n",
- status);
- return -1;
- }
-
- /* Receive any available data */
- status = regs->ic_status;
- if (rx_buffer != NULL) {
- while (status & IC_STATUS_RFNE) {
- *rx_buffer++ = (uint8_t)regs->ic_data_cmd;
- bytes_transferred++;
- status = regs->ic_status;
- }
- }
-
- /* Determine if space is available in the FIFO */
- if (status & IC_STATUS_TFNF) {
- /* End of the transaction? */
- cmd = IC_DATA_CMD_WRITE | *tx_buffer++ | restart;
- if (length == 1)
- cmd |= stop;
- restart = 0;
-
- /* Place a data byte into the FIFO */
- regs->ic_data_cmd = cmd;
- length--;
- bytes_transferred++;
- } else
- udelay(1);
- } while (length > 0);
- return bytes_transferred;
-}
-
-static int platform_i2c_read(uint32_t restart, uint8_t *rx_buffer, int length,
- uint32_t stop, struct stopwatch *timeout)
-{
- int bytes_transferred;
- uint32_t cmd;
- int fifo_bytes;
- I2C_REGS *regs;
- uint32_t status;
-
- ASSERT(rx_buffer != NULL);
- ASSERT(timeout != NULL);
- regs = get_i2c_address();
-
- /* Empty the FIFO */
- status = regs->ic_status;
- while (status & IC_STATUS_RFNE) {
- (void)regs->ic_data_cmd;
- status = regs->ic_status;
- }
-
- /* Fill the FIFO with read commands */
- fifo_bytes = MIN(length, 16);
- bytes_transferred = 0;
- while (length > 0) {
- status = regs->ic_raw_intr_stat;
-
- /* Check for errors */
- if (status & (IC_INTR_RX_OVER | IC_INTR_RX_UNDER
- | IC_INTR_TX_ABRT | IC_INTR_TX_OVER)) {
- i2c_disable(regs);
- if (CONFIG(I2C_DEBUG))
- printk(BIOS_ERR,
- "0x%08x: ic_raw_intr_stat, I2C read error!\n",
- status);
- return -1;
- }
-
- /* Check for timeout */
- if (stopwatch_expired(timeout)) {
- if (CONFIG(I2C_DEBUG))
- printk(BIOS_ERR,
- "0x%08x: ic_raw_intr_stat, I2C read timeout!\n",
- status);
- return -1;
- }
-
- /* Receive any available data */
- status = regs->ic_status;
- if (status & IC_STATUS_RFNE) {
- /* Save the next data byte, removed from the RX FIFO */
- *rx_buffer++ = (uint8_t)regs->ic_data_cmd;
- bytes_transferred++;
- }
-
- if ((status & IC_STATUS_TFNF)
- || ((status & IC_STATUS_RFNE) && (fifo_bytes > 0))) {
- /* End of the transaction? */
- cmd = IC_DATA_CMD_READ | restart;
- if (length == 1)
- cmd |= stop;
- restart = 0;
-
- /* Place a read command into the TX FIFO */
- regs->ic_data_cmd = cmd;
- if (fifo_bytes > 0)
- fifo_bytes--;
- length--;
- } else
- udelay(1);
- }
- return bytes_transferred;
-}
-
-int platform_i2c_transfer(unsigned int bus, struct i2c_msg *segment,
- int seg_count)
-{
- int bytes_transferred;
- uint8_t chip;
- uint32_t cmd;
- int data_bytes;
- int index;
- int length;
- I2C_REGS *regs;
- uint32_t restart;
- uint8_t *rx_buffer;
- uint32_t status;
- uint32_t stop;
- struct stopwatch timeout;
- int total_bytes;
- uint8_t *tx_buffer;
- int tx_bytes;
-
- if (CONFIG(I2C_DEBUG)) {
- for (index = 0; index < seg_count;) {
- if (index == 0)
- printk(BIOS_ERR, "I2C Start\n");
- printk(BIOS_ERR,
- "I2C segment[%d]: %s 0x%02x %s %p, 0x%08x bytes\n",
- index,
- (segment[index].flags & I2C_M_RD) ? "Read from" : "Write to",
- segment[index].slave,
- (segment[index].flags & I2C_M_RD) ? "to " : "from",
- segment[index].buf,
- segment[index].len);
- printk(BIOS_ERR, "I2C %s\n",
- (++index >= seg_count) ? "Stop" : "Restart");
- }
- }
-
- regs = get_i2c_address();
-
- /* Disable the I2C controller to get access to the registers */
- i2c_disable(regs);
-
- /* Set the slave address */
- ASSERT(seg_count > 0);
- ASSERT(segment != NULL);
-
- /* Clear the start and stop detection */
- status = regs->ic_clr_start_det;
- status = regs->ic_clr_stop_det;
-
- /* Set addressing mode to 7-bit and fast mode */
- cmd = regs->ic_con;
- cmd &= ~(IC_CON_10B | IC_CON_SPEED);
- cmd |= IC_CON_RESTART_EN | IC_CON_7B | IC_CON_SPEED_400_KHz
- | IC_CON_MASTER_MODE;
- regs->ic_con = cmd;
-
- /* Set the target chip address */
- chip = segment->slave;
- regs->ic_tar = chip;
-
- /* Enable the I2C controller */
- regs->ic_enable = IC_ENABLE_CONTROLLER;
-
- /* Clear the interrupts */
- status = regs->ic_clr_rx_under;
- status = regs->ic_clr_rx_over;
- status = regs->ic_clr_tx_over;
- status = regs->ic_clr_tx_abrt;
-
- /* Start the timeout */
- stopwatch_init_usecs_expire(&timeout, CONFIG_I2C_TRANSFER_TIMEOUT_US);
-
- /* Process each of the segments */
- total_bytes = 0;
- tx_bytes = 0;
- bytes_transferred = 0;
- rx_buffer = NULL;
- restart = 0;
- index = 0;
- while (index++ < seg_count) {
- length = segment->len;
- total_bytes += length;
- ASSERT(segment->buf != NULL);
- ASSERT(length >= 1);
- ASSERT(segment->slave == chip);
-
- /* Determine if this is the last segment of the transaction */
- stop = (index == seg_count) ? IC_DATA_CMD_STOP : 0;
-
- /* Fill the FIFO with the necessary command bytes */
- if (segment->flags & I2C_M_RD) {
- /* Place read commands into the FIFO */
- rx_buffer = segment->buf;
- data_bytes = platform_i2c_read(restart, rx_buffer,
- length, stop, &timeout);
-
- /* Return any detected error */
- if (data_bytes < 0) {
- if (CONFIG(I2C_DEBUG))
- printk(BIOS_ERR,
- "I2C segment[%d] failed\n",
- index);
- return data_bytes;
- }
- bytes_transferred += data_bytes;
- } else {
- /* Write the data into the FIFO */
- tx_buffer = segment->buf;
- tx_bytes += length;
- data_bytes = platform_i2c_write(restart, tx_buffer,
- length, stop, rx_buffer, &timeout);
-
- /* Return any detected error */
- if (data_bytes < 0) {
- if (CONFIG(I2C_DEBUG))
- printk(BIOS_ERR,
- "I2C segment[%d] failed\n",
- index);
- return data_bytes;
- }
- bytes_transferred += data_bytes;
- }
- segment++;
- restart = IC_DATA_CMD_RESTART;
- }
-
- /* Wait for the end of the transaction */
- if (rx_buffer != NULL)
- rx_buffer += bytes_transferred - tx_bytes;
- do {
- /* Receive any available data */
- status = regs->ic_status;
- if ((rx_buffer != NULL) && (status & IC_STATUS_RFNE)) {
- *rx_buffer++ = (uint8_t)regs->ic_data_cmd;
- bytes_transferred++;
- } else {
- status = regs->ic_raw_intr_stat;
- if ((total_bytes == bytes_transferred)
- && (status & IC_INTR_STOP_DET))
- break;
-
- /* Check for errors */
- if (status & (IC_INTR_RX_OVER | IC_INTR_RX_UNDER
- | IC_INTR_TX_ABRT | IC_INTR_TX_OVER)) {
- i2c_disable(regs);
- if (CONFIG(I2C_DEBUG)) {
- printk(BIOS_ERR,
- "0x%08x: ic_raw_intr_stat, I2C read error!\n",
- status);
- printk(BIOS_ERR,
- "I2C segment[%d] failed\n",
- seg_count - 1);
- }
- return -1;
- }
-
- /* Check for timeout */
- if (stopwatch_expired(&timeout)) {
- if (CONFIG(I2C_DEBUG)) {
- printk(BIOS_ERR,
- "0x%08x: ic_raw_intr_stat, I2C read timeout!\n",
- status);
- printk(BIOS_ERR,
- "I2C segment[%d] failed\n",
- seg_count - 1);
- }
- return -1;
- }
-
- /* Delay for a while */
- udelay(1);
- }
- } while (1);
- i2c_disable(regs);
- regs->ic_tar = 0;
-
- /* Return the number of bytes transferred */
- if (CONFIG(I2C_DEBUG))
- printk(BIOS_ERR, "0x%08x: bytes transferred\n",
- bytes_transferred);
- return bytes_transferred;
-}
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