unsigned int exynos_dp_write_byte_to_dpcd(unsigned int reg_addr,
unsigned char data)
{
unsigned int reg, ret;
/* Clear AUX CH data buffer */
reg = BUF_CLR;
writel(reg, &dp_regs->buffer_data_ctl);
/* Select DPCD device address */
reg = AUX_ADDR_7_0(reg_addr);
writel(reg, &dp_regs->aux_addr_7_0);
reg = AUX_ADDR_15_8(reg_addr);
writel(reg, &dp_regs->aux_addr_15_8);
reg = AUX_ADDR_19_16(reg_addr);
writel(reg, &dp_regs->aux_addr_19_16);
/* Write data buffer */
reg = (unsigned int)data;
writel(reg, &dp_regs->buf_data0);
/*
* Set DisplayPort transaction and write 1 byte
* If bit 3 is 1, DisplayPort transaction.
* If Bit 3 is 0, I2C transaction.
*/
reg = AUX_TX_COMM_DP_TRANSACTION | AUX_TX_COMM_WRITE;
writel(reg, &dp_regs->aux_ch_ctl1);
/* Start AUX transaction */
ret = exynos_dp_start_aux_transaction();
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP Aux transaction failed\n");
return ret;
}
return ret;
}
unsigned int exynos_dp_read_byte_from_dpcd(u32 reg_addr,
unsigned char *data)
{
u32 reg;
int retval;
/* Clear AUX CH data buffer */
reg = BUF_CLR;
lwrite32(reg, &dp_regs->buffer_data_ctl);
/* Select DPCD device address */
reg = AUX_ADDR_7_0(reg_addr);
lwrite32(reg, &dp_regs->aux_addr_7_0);
reg = AUX_ADDR_15_8(reg_addr);
lwrite32(reg, &dp_regs->aux_addr_15_8);
reg = AUX_ADDR_19_16(reg_addr);
lwrite32(reg, &dp_regs->aux_addr_19_16);
/*
* Set DisplayPort transaction and read 1 byte
* If bit 3 is 1, DisplayPort transaction.
* If Bit 3 is 0, I2C transaction.
*/
reg = AUX_TX_COMM_DP_TRANSACTION | AUX_TX_COMM_READ;
lwrite32(reg, &dp_regs->aux_ch_ctl1);
/* Start AUX transaction */
retval = exynos_dp_start_aux_transaction();
if (retval != EXYNOS_DP_SUCCESS)
printk(BIOS_DEBUG, "DP Aux Transaction fail!\n");
/* Read data buffer */
reg = lread32(&dp_regs->buf_data0);
*data = (unsigned char)(reg & 0xff);
return retval;
}
static int rk_edp_dpcd_transfer(struct rk_edp *edp,
unsigned int val_addr, u8 *data,
unsigned int length,
enum dpcd_request request)
{
int val;
int i, try_times;
int retval = 0;
u32 len = 0;
while (length) {
len = MIN(length, 16);
for (try_times = 0; try_times < 10; try_times++) {
/* Clear AUX CH data buffer */
val = BUF_CLR;
write32(&edp->regs->buf_data_ctl, val);
/* Select DPCD device address */
val = AUX_ADDR_7_0(val_addr);
write32(&edp->regs->aux_addr_7_0, val);
val = AUX_ADDR_15_8(val_addr);
write32(&edp->regs->aux_addr_15_8, val);
val = AUX_ADDR_19_16(val_addr);
write32(&edp->regs->aux_addr_19_16, val);
/*
* Set DisplayPort transaction and read 1 byte
* If bit 3 is 1, DisplayPort transaction.
* If Bit 3 is 0, I2C transaction.
*/
if (request == DPCD_WRITE) {
val = AUX_LENGTH(len) |
AUX_TX_COMM_DP_TRANSACTION |
AUX_TX_COMM_WRITE;
for (i = 0; i < len; i++)
write32(&edp->regs->buf_data[i],
*data++);
} else
val = AUX_LENGTH(len) |
AUX_TX_COMM_DP_TRANSACTION |
AUX_TX_COMM_READ;
write32(&edp->regs->aux_ch_ctl_1, val);
/* Start AUX transaction */
retval = rk_edp_start_aux_transaction(edp);
if (retval == 0)
break;
else
printk(BIOS_WARNING, "read dpcd Aux Transaction fail!\n");
}
if (retval)
return -1;
if (request == DPCD_READ) {
for (i = 0; i < len; i++)
*data++ = (u8)read32(&edp->regs->buf_data[i]);
}
length -= len;
val_addr += 16;
}
return 0;
}
static int rk_edp_dpcd_transfer(struct rk3288_edp *regs,
unsigned int val_addr, u8 *in_data,
unsigned int length,
enum dpcd_request request)
{
int val;
int i, try_times;
u8 *data;
int ret = 0;
u32 len = 0;
while (length) {
len = min(length, 16U);
for (try_times = 0; try_times < 10; try_times++) {
data = in_data;
/* Clear AUX CH data buffer */
writel(BUF_CLR, ®s->buf_data_ctl);
/* Select DPCD device address */
writel(AUX_ADDR_7_0(val_addr), ®s->aux_addr_7_0);
writel(AUX_ADDR_15_8(val_addr), ®s->aux_addr_15_8);
writel(AUX_ADDR_19_16(val_addr), ®s->aux_addr_19_16);
/*
* Set DisplayPort transaction and read 1 byte
* If bit 3 is 1, DisplayPort transaction.
* If Bit 3 is 0, I2C transaction.
*/
if (request == DPCD_WRITE) {
val = AUX_LENGTH(len) |
AUX_TX_COMM_DP_TRANSACTION |
AUX_TX_COMM_WRITE;
for (i = 0; i < len; i++)
writel(*data++, ®s->buf_data[i]);
} else
val = AUX_LENGTH(len) |
AUX_TX_COMM_DP_TRANSACTION |
AUX_TX_COMM_READ;
writel(val, ®s->aux_ch_ctl_1);
/* Start AUX transaction */
ret = rk_edp_start_aux_transaction(regs);
if (ret == 0)
break;
else
printf("read dpcd Aux Transaction fail!\n");
}
if (ret)
return ret;
if (request == DPCD_READ) {
for (i = 0; i < len; i++)
*data++ = (u8)readl(®s->buf_data[i]);
}
length -= len;
val_addr += len;
in_data += len;
}
return 0;
}
unsigned int exynos_dp_read_bytes_from_dpcd(u32 reg_addr,
unsigned int count,
unsigned char data[])
{
u32 reg;
unsigned int start_offset;
unsigned int cur_data_count;
unsigned int cur_data_idx;
unsigned int retry_cnt;
unsigned int ret = 0;
/* Clear AUX CH data buffer */
reg = BUF_CLR;
lwrite32(reg, &dp_regs->buffer_data_ctl);
start_offset = 0;
while (start_offset < count) {
/* Buffer size of AUX CH is 16 * 4bytes */
if ((count - start_offset) > 16)
cur_data_count = 16;
else
cur_data_count = count - start_offset;
retry_cnt = 5;
while (retry_cnt) {
/* Select DPCD device address */
reg = AUX_ADDR_7_0(reg_addr + start_offset);
lwrite32(reg, &dp_regs->aux_addr_7_0);
reg = AUX_ADDR_15_8(reg_addr + start_offset);
lwrite32(reg, &dp_regs->aux_addr_15_8);
reg = AUX_ADDR_19_16(reg_addr + start_offset);
lwrite32(reg, &dp_regs->aux_addr_19_16);
/*
* Set DisplayPort transaction and read
* If bit 3 is 1, DisplayPort transaction.
* If Bit 3 is 0, I2C transaction.
*/
reg = AUX_LENGTH(cur_data_count) |
AUX_TX_COMM_DP_TRANSACTION | AUX_TX_COMM_READ;
lwrite32(reg, &dp_regs->aux_ch_ctl1);
/* Start AUX transaction */
ret = exynos_dp_start_aux_transaction();
if (ret != EXYNOS_DP_SUCCESS) {
if (retry_cnt == 0) {
printk(BIOS_ERR, "DP Aux Transaction failed\n");
return ret;
}
retry_cnt--;
} else
break;
}
for (cur_data_idx = 0; cur_data_idx < cur_data_count;
cur_data_idx++) {
reg = lread32((void *)((u32)&dp_regs->buf_data0 +
4 * cur_data_idx));
data[start_offset + cur_data_idx] = (unsigned char)reg;
}
start_offset += cur_data_count;
}
return ret;
}
