diff options
Diffstat (limited to 'drivers/gpu/drm/msm/edp/edp_aux.c')
| -rw-r--r-- | drivers/gpu/drm/msm/edp/edp_aux.c | 265 |
1 files changed, 0 insertions, 265 deletions
diff --git a/drivers/gpu/drm/msm/edp/edp_aux.c b/drivers/gpu/drm/msm/edp/edp_aux.c deleted file mode 100644 index e3d85c622cfb..000000000000 --- a/drivers/gpu/drm/msm/edp/edp_aux.c +++ /dev/null @@ -1,265 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved. - */ - -#include "edp.h" -#include "edp.xml.h" - -#define AUX_CMD_FIFO_LEN 144 -#define AUX_CMD_NATIVE_MAX 16 -#define AUX_CMD_I2C_MAX 128 - -#define EDP_INTR_AUX_I2C_ERR \ - (EDP_INTERRUPT_REG_1_WRONG_ADDR | EDP_INTERRUPT_REG_1_TIMEOUT | \ - EDP_INTERRUPT_REG_1_NACK_DEFER | EDP_INTERRUPT_REG_1_WRONG_DATA_CNT | \ - EDP_INTERRUPT_REG_1_I2C_NACK | EDP_INTERRUPT_REG_1_I2C_DEFER) -#define EDP_INTR_TRANS_STATUS \ - (EDP_INTERRUPT_REG_1_AUX_I2C_DONE | EDP_INTR_AUX_I2C_ERR) - -struct edp_aux { - void __iomem *base; - bool msg_err; - - struct completion msg_comp; - - /* To prevent the message transaction routine from reentry. */ - struct mutex msg_mutex; - - struct drm_dp_aux drm_aux; -}; -#define to_edp_aux(x) container_of(x, struct edp_aux, drm_aux) - -static int edp_msg_fifo_tx(struct edp_aux *aux, struct drm_dp_aux_msg *msg) -{ - u32 data[4]; - u32 reg, len; - bool native = msg->request & (DP_AUX_NATIVE_WRITE & DP_AUX_NATIVE_READ); - bool read = msg->request & (DP_AUX_I2C_READ & DP_AUX_NATIVE_READ); - u8 *msgdata = msg->buffer; - int i; - - if (read) - len = 4; - else - len = msg->size + 4; - - /* - * cmd fifo only has depth of 144 bytes - */ - if (len > AUX_CMD_FIFO_LEN) - return -EINVAL; - - /* Pack cmd and write to HW */ - data[0] = (msg->address >> 16) & 0xf; /* addr[19:16] */ - if (read) - data[0] |= BIT(4); /* R/W */ - - data[1] = (msg->address >> 8) & 0xff; /* addr[15:8] */ - data[2] = msg->address & 0xff; /* addr[7:0] */ - data[3] = (msg->size - 1) & 0xff; /* len[7:0] */ - - for (i = 0; i < len; i++) { - reg = (i < 4) ? data[i] : msgdata[i - 4]; - reg = EDP_AUX_DATA_DATA(reg); /* index = 0, write */ - if (i == 0) - reg |= EDP_AUX_DATA_INDEX_WRITE; - edp_write(aux->base + REG_EDP_AUX_DATA, reg); - } - - reg = 0; /* Transaction number is always 1 */ - if (!native) /* i2c */ - reg |= EDP_AUX_TRANS_CTRL_I2C; - - reg |= EDP_AUX_TRANS_CTRL_GO; - edp_write(aux->base + REG_EDP_AUX_TRANS_CTRL, reg); - - return 0; -} - -static int edp_msg_fifo_rx(struct edp_aux *aux, struct drm_dp_aux_msg *msg) -{ - u32 data; - u8 *dp; - int i; - u32 len = msg->size; - - edp_write(aux->base + REG_EDP_AUX_DATA, - EDP_AUX_DATA_INDEX_WRITE | EDP_AUX_DATA_READ); /* index = 0 */ - - dp = msg->buffer; - - /* discard first byte */ - data = edp_read(aux->base + REG_EDP_AUX_DATA); - for (i = 0; i < len; i++) { - data = edp_read(aux->base + REG_EDP_AUX_DATA); - dp[i] = (u8)((data >> 8) & 0xff); - } - - return 0; -} - -/* - * This function does the real job to process an AUX transaction. - * It will call msm_edp_aux_ctrl() function to reset the AUX channel, - * if the waiting is timeout. - * The caller who triggers the transaction should avoid the - * msm_edp_aux_ctrl() running concurrently in other threads, i.e. - * start transaction only when AUX channel is fully enabled. - */ -static ssize_t edp_aux_transfer(struct drm_dp_aux *drm_aux, - struct drm_dp_aux_msg *msg) -{ - struct edp_aux *aux = to_edp_aux(drm_aux); - ssize_t ret; - unsigned long time_left; - bool native = msg->request & (DP_AUX_NATIVE_WRITE & DP_AUX_NATIVE_READ); - bool read = msg->request & (DP_AUX_I2C_READ & DP_AUX_NATIVE_READ); - - /* Ignore address only message */ - if ((msg->size == 0) || (msg->buffer == NULL)) { - msg->reply = native ? - DP_AUX_NATIVE_REPLY_ACK : DP_AUX_I2C_REPLY_ACK; - return msg->size; - } - - /* msg sanity check */ - if ((native && (msg->size > AUX_CMD_NATIVE_MAX)) || - (msg->size > AUX_CMD_I2C_MAX)) { - pr_err("%s: invalid msg: size(%zu), request(%x)\n", - __func__, msg->size, msg->request); - return -EINVAL; - } - - mutex_lock(&aux->msg_mutex); - - aux->msg_err = false; - reinit_completion(&aux->msg_comp); - - ret = edp_msg_fifo_tx(aux, msg); - if (ret < 0) - goto unlock_exit; - - DBG("wait_for_completion"); - time_left = wait_for_completion_timeout(&aux->msg_comp, - msecs_to_jiffies(300)); - if (!time_left) { - /* - * Clear GO and reset AUX channel - * to cancel the current transaction. - */ - edp_write(aux->base + REG_EDP_AUX_TRANS_CTRL, 0); - msm_edp_aux_ctrl(aux, 1); - pr_err("%s: aux timeout,\n", __func__); - ret = -ETIMEDOUT; - goto unlock_exit; - } - DBG("completion"); - - if (!aux->msg_err) { - if (read) { - ret = edp_msg_fifo_rx(aux, msg); - if (ret < 0) - goto unlock_exit; - } - - msg->reply = native ? - DP_AUX_NATIVE_REPLY_ACK : DP_AUX_I2C_REPLY_ACK; - } else { - /* Reply defer to retry */ - msg->reply = native ? - DP_AUX_NATIVE_REPLY_DEFER : DP_AUX_I2C_REPLY_DEFER; - /* - * The sleep time in caller is not long enough to make sure - * our H/W completes transactions. Add more defer time here. - */ - msleep(100); - } - - /* Return requested size for success or retry */ - ret = msg->size; - -unlock_exit: - mutex_unlock(&aux->msg_mutex); - return ret; -} - -void *msm_edp_aux_init(struct msm_edp *edp, void __iomem *regbase, struct drm_dp_aux **drm_aux) -{ - struct device *dev = &edp->pdev->dev; - struct edp_aux *aux = NULL; - int ret; - - DBG(""); - aux = devm_kzalloc(dev, sizeof(*aux), GFP_KERNEL); - if (!aux) - return NULL; - - aux->base = regbase; - mutex_init(&aux->msg_mutex); - init_completion(&aux->msg_comp); - - aux->drm_aux.name = "msm_edp_aux"; - aux->drm_aux.dev = dev; - aux->drm_aux.drm_dev = edp->dev; - aux->drm_aux.transfer = edp_aux_transfer; - ret = drm_dp_aux_register(&aux->drm_aux); - if (ret) { - pr_err("%s: failed to register drm aux: %d\n", __func__, ret); - mutex_destroy(&aux->msg_mutex); - } - - if (drm_aux && aux) - *drm_aux = &aux->drm_aux; - - return aux; -} - -void msm_edp_aux_destroy(struct device *dev, struct edp_aux *aux) -{ - if (aux) { - drm_dp_aux_unregister(&aux->drm_aux); - mutex_destroy(&aux->msg_mutex); - } -} - -irqreturn_t msm_edp_aux_irq(struct edp_aux *aux, u32 isr) -{ - if (isr & EDP_INTR_TRANS_STATUS) { - DBG("isr=%x", isr); - edp_write(aux->base + REG_EDP_AUX_TRANS_CTRL, 0); - - if (isr & EDP_INTR_AUX_I2C_ERR) - aux->msg_err = true; - else - aux->msg_err = false; - - complete(&aux->msg_comp); - } - - return IRQ_HANDLED; -} - -void msm_edp_aux_ctrl(struct edp_aux *aux, int enable) -{ - u32 data; - - DBG("enable=%d", enable); - data = edp_read(aux->base + REG_EDP_AUX_CTRL); - - if (enable) { - data |= EDP_AUX_CTRL_RESET; - edp_write(aux->base + REG_EDP_AUX_CTRL, data); - /* Make sure full reset */ - wmb(); - usleep_range(500, 1000); - - data &= ~EDP_AUX_CTRL_RESET; - data |= EDP_AUX_CTRL_ENABLE; - edp_write(aux->base + REG_EDP_AUX_CTRL, data); - } else { - data &= ~EDP_AUX_CTRL_ENABLE; - edp_write(aux->base + REG_EDP_AUX_CTRL, data); - } -} - |