279 lines
6.5 KiB
C
279 lines
6.5 KiB
C
/*
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* Copyright (C) 2013 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "hdmi.h"
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struct hdmi_i2c_adapter {
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struct i2c_adapter base;
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struct hdmi *hdmi;
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bool sw_done;
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wait_queue_head_t ddc_event;
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};
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#define to_hdmi_i2c_adapter(x) container_of(x, struct hdmi_i2c_adapter, base)
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static void init_ddc(struct hdmi_i2c_adapter *hdmi_i2c)
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{
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struct hdmi *hdmi = hdmi_i2c->hdmi;
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hdmi_write(hdmi, REG_HDMI_DDC_CTRL,
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HDMI_DDC_CTRL_SW_STATUS_RESET);
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hdmi_write(hdmi, REG_HDMI_DDC_CTRL,
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HDMI_DDC_CTRL_SOFT_RESET);
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hdmi_write(hdmi, REG_HDMI_DDC_SPEED,
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HDMI_DDC_SPEED_THRESHOLD(2) |
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HDMI_DDC_SPEED_PRESCALE(10));
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hdmi_write(hdmi, REG_HDMI_DDC_SETUP,
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HDMI_DDC_SETUP_TIMEOUT(0xff));
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/* enable reference timer for 27us */
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hdmi_write(hdmi, REG_HDMI_DDC_REF,
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HDMI_DDC_REF_REFTIMER_ENABLE |
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HDMI_DDC_REF_REFTIMER(27));
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}
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static int ddc_clear_irq(struct hdmi_i2c_adapter *hdmi_i2c)
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{
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struct hdmi *hdmi = hdmi_i2c->hdmi;
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struct drm_device *dev = hdmi->dev;
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uint32_t retry = 0xffff;
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uint32_t ddc_int_ctrl;
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do {
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--retry;
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hdmi_write(hdmi, REG_HDMI_DDC_INT_CTRL,
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HDMI_DDC_INT_CTRL_SW_DONE_ACK |
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HDMI_DDC_INT_CTRL_SW_DONE_MASK);
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ddc_int_ctrl = hdmi_read(hdmi, REG_HDMI_DDC_INT_CTRL);
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} while ((ddc_int_ctrl & HDMI_DDC_INT_CTRL_SW_DONE_INT) && retry);
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if (!retry) {
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dev_err(dev->dev, "timeout waiting for DDC\n");
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return -ETIMEDOUT;
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}
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hdmi_i2c->sw_done = false;
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return 0;
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}
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#define MAX_TRANSACTIONS 4
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static bool sw_done(struct hdmi_i2c_adapter *hdmi_i2c)
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{
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struct hdmi *hdmi = hdmi_i2c->hdmi;
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if (!hdmi_i2c->sw_done) {
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uint32_t ddc_int_ctrl;
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ddc_int_ctrl = hdmi_read(hdmi, REG_HDMI_DDC_INT_CTRL);
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if ((ddc_int_ctrl & HDMI_DDC_INT_CTRL_SW_DONE_MASK) &&
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(ddc_int_ctrl & HDMI_DDC_INT_CTRL_SW_DONE_INT)) {
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hdmi_i2c->sw_done = true;
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hdmi_write(hdmi, REG_HDMI_DDC_INT_CTRL,
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HDMI_DDC_INT_CTRL_SW_DONE_ACK);
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}
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}
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return hdmi_i2c->sw_done;
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}
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static int msm_hdmi_i2c_xfer(struct i2c_adapter *i2c,
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struct i2c_msg *msgs, int num)
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{
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struct hdmi_i2c_adapter *hdmi_i2c = to_hdmi_i2c_adapter(i2c);
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struct hdmi *hdmi = hdmi_i2c->hdmi;
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struct drm_device *dev = hdmi->dev;
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static const uint32_t nack[] = {
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HDMI_DDC_SW_STATUS_NACK0, HDMI_DDC_SW_STATUS_NACK1,
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HDMI_DDC_SW_STATUS_NACK2, HDMI_DDC_SW_STATUS_NACK3,
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};
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int indices[MAX_TRANSACTIONS];
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int ret, i, j, index = 0;
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uint32_t ddc_status, ddc_data, i2c_trans;
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num = min(num, MAX_TRANSACTIONS);
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WARN_ON(!(hdmi_read(hdmi, REG_HDMI_CTRL) & HDMI_CTRL_ENABLE));
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if (num == 0)
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return num;
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init_ddc(hdmi_i2c);
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ret = ddc_clear_irq(hdmi_i2c);
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if (ret)
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return ret;
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for (i = 0; i < num; i++) {
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struct i2c_msg *p = &msgs[i];
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uint32_t raw_addr = p->addr << 1;
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if (p->flags & I2C_M_RD)
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raw_addr |= 1;
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ddc_data = HDMI_DDC_DATA_DATA(raw_addr) |
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HDMI_DDC_DATA_DATA_RW(DDC_WRITE);
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if (i == 0) {
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ddc_data |= HDMI_DDC_DATA_INDEX(0) |
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HDMI_DDC_DATA_INDEX_WRITE;
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}
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hdmi_write(hdmi, REG_HDMI_DDC_DATA, ddc_data);
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index++;
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indices[i] = index;
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if (p->flags & I2C_M_RD) {
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index += p->len;
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} else {
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for (j = 0; j < p->len; j++) {
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ddc_data = HDMI_DDC_DATA_DATA(p->buf[j]) |
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HDMI_DDC_DATA_DATA_RW(DDC_WRITE);
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hdmi_write(hdmi, REG_HDMI_DDC_DATA, ddc_data);
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index++;
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}
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}
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i2c_trans = HDMI_I2C_TRANSACTION_REG_CNT(p->len) |
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HDMI_I2C_TRANSACTION_REG_RW(
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(p->flags & I2C_M_RD) ? DDC_READ : DDC_WRITE) |
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HDMI_I2C_TRANSACTION_REG_START;
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if (i == (num - 1))
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i2c_trans |= HDMI_I2C_TRANSACTION_REG_STOP;
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hdmi_write(hdmi, REG_HDMI_I2C_TRANSACTION(i), i2c_trans);
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}
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/* trigger the transfer: */
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hdmi_write(hdmi, REG_HDMI_DDC_CTRL,
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HDMI_DDC_CTRL_TRANSACTION_CNT(num - 1) |
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HDMI_DDC_CTRL_GO);
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ret = wait_event_timeout(hdmi_i2c->ddc_event, sw_done(hdmi_i2c), HZ/4);
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if (ret <= 0) {
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if (ret == 0)
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ret = -ETIMEDOUT;
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dev_warn(dev->dev, "DDC timeout: %d\n", ret);
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DBG("sw_status=%08x, hw_status=%08x, int_ctrl=%08x",
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hdmi_read(hdmi, REG_HDMI_DDC_SW_STATUS),
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hdmi_read(hdmi, REG_HDMI_DDC_HW_STATUS),
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hdmi_read(hdmi, REG_HDMI_DDC_INT_CTRL));
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return ret;
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}
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ddc_status = hdmi_read(hdmi, REG_HDMI_DDC_SW_STATUS);
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/* read back results of any read transactions: */
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for (i = 0; i < num; i++) {
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struct i2c_msg *p = &msgs[i];
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if (!(p->flags & I2C_M_RD))
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continue;
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/* check for NACK: */
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if (ddc_status & nack[i]) {
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DBG("ddc_status=%08x", ddc_status);
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break;
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}
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ddc_data = HDMI_DDC_DATA_DATA_RW(DDC_READ) |
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HDMI_DDC_DATA_INDEX(indices[i]) |
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HDMI_DDC_DATA_INDEX_WRITE;
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hdmi_write(hdmi, REG_HDMI_DDC_DATA, ddc_data);
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/* discard first byte: */
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hdmi_read(hdmi, REG_HDMI_DDC_DATA);
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for (j = 0; j < p->len; j++) {
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ddc_data = hdmi_read(hdmi, REG_HDMI_DDC_DATA);
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p->buf[j] = FIELD(ddc_data, HDMI_DDC_DATA_DATA);
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}
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}
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return i;
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}
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static u32 msm_hdmi_i2c_func(struct i2c_adapter *adapter)
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{
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return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
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}
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static const struct i2c_algorithm msm_hdmi_i2c_algorithm = {
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.master_xfer = msm_hdmi_i2c_xfer,
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.functionality = msm_hdmi_i2c_func,
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};
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void msm_hdmi_i2c_irq(struct i2c_adapter *i2c)
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{
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struct hdmi_i2c_adapter *hdmi_i2c = to_hdmi_i2c_adapter(i2c);
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if (sw_done(hdmi_i2c))
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wake_up_all(&hdmi_i2c->ddc_event);
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}
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void msm_hdmi_i2c_destroy(struct i2c_adapter *i2c)
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{
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struct hdmi_i2c_adapter *hdmi_i2c = to_hdmi_i2c_adapter(i2c);
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i2c_del_adapter(i2c);
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kfree(hdmi_i2c);
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}
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struct i2c_adapter *msm_hdmi_i2c_init(struct hdmi *hdmi)
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{
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struct hdmi_i2c_adapter *hdmi_i2c;
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struct i2c_adapter *i2c = NULL;
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int ret;
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hdmi_i2c = kzalloc(sizeof(*hdmi_i2c), GFP_KERNEL);
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if (!hdmi_i2c) {
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ret = -ENOMEM;
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goto fail;
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}
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i2c = &hdmi_i2c->base;
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hdmi_i2c->hdmi = hdmi;
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init_waitqueue_head(&hdmi_i2c->ddc_event);
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i2c->owner = THIS_MODULE;
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i2c->class = I2C_CLASS_DDC;
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snprintf(i2c->name, sizeof(i2c->name), "msm hdmi i2c");
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i2c->dev.parent = &hdmi->pdev->dev;
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i2c->algo = &msm_hdmi_i2c_algorithm;
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ret = i2c_add_adapter(i2c);
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if (ret)
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goto fail;
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return i2c;
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fail:
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if (i2c)
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msm_hdmi_i2c_destroy(i2c);
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return ERR_PTR(ret);
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}
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