/*
 * Copyright 2014 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include "amdgpu.h"
#include "nbio/nbio_6_1_offset.h"
#include "nbio/nbio_6_1_sh_mask.h"
#include "gc/gc_9_0_offset.h"
#include "gc/gc_9_0_sh_mask.h"
#include "soc15.h"
#include "vega10_ih.h"
#include "soc15_common.h"
#include "mxgpu_ai.h"

static void xgpu_ai_mailbox_send_ack(struct amdgpu_device *adev)
{
	WREG8(AI_MAIBOX_CONTROL_RCV_OFFSET_BYTE, 2);
}

static void xgpu_ai_mailbox_set_valid(struct amdgpu_device *adev, bool val)
{
	WREG8(AI_MAIBOX_CONTROL_TRN_OFFSET_BYTE, val ? 1 : 0);
}

/*
 * this peek_msg could *only* be called in IRQ routine becuase in IRQ routine
 * RCV_MSG_VALID filed of BIF_BX_PF0_MAILBOX_CONTROL must already be set to 1
 * by host.
 *
 * if called no in IRQ routine, this peek_msg cannot guaranteed to return the
 * correct value since it doesn't return the RCV_DW0 under the case that
 * RCV_MSG_VALID is set by host.
 */
static enum idh_event xgpu_ai_mailbox_peek_msg(struct amdgpu_device *adev)
{
	return RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
				mmBIF_BX_PF0_MAILBOX_MSGBUF_RCV_DW0));
}


static int xgpu_ai_mailbox_rcv_msg(struct amdgpu_device *adev,
				   enum idh_event event)
{
	u32 reg;

	reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
					     mmBIF_BX_PF0_MAILBOX_MSGBUF_RCV_DW0));
	if (reg != event)
		return -ENOENT;

	xgpu_ai_mailbox_send_ack(adev);

	return 0;
}

static uint8_t xgpu_ai_peek_ack(struct amdgpu_device *adev) {
	return RREG8(AI_MAIBOX_CONTROL_TRN_OFFSET_BYTE) & 2;
}

static int xgpu_ai_poll_ack(struct amdgpu_device *adev)
{
	int timeout  = AI_MAILBOX_POLL_ACK_TIMEDOUT;
	u8 reg;

	do {
		reg = RREG8(AI_MAIBOX_CONTROL_TRN_OFFSET_BYTE);
		if (reg & 2)
			return 0;

		mdelay(5);
		timeout -= 5;
	} while (timeout > 1);

	pr_err("Doesn't get TRN_MSG_ACK from pf in %d msec\n", AI_MAILBOX_POLL_ACK_TIMEDOUT);

	return -ETIME;
}

static int xgpu_ai_poll_msg(struct amdgpu_device *adev, enum idh_event event)
{
	int r, timeout = AI_MAILBOX_POLL_MSG_TIMEDOUT;

	do {
		r = xgpu_ai_mailbox_rcv_msg(adev, event);
		if (!r)
			return 0;

		msleep(10);
		timeout -= 10;
	} while (timeout > 1);

	pr_err("Doesn't get msg:%d from pf, error=%d\n", event, r);

	return -ETIME;
}

static void xgpu_ai_mailbox_trans_msg (struct amdgpu_device *adev,
	      enum idh_request req, u32 data1, u32 data2, u32 data3) {
	u32 reg;
	int r;
	uint8_t trn;

	/* IMPORTANT:
	 * clear TRN_MSG_VALID valid to clear host's RCV_MSG_ACK
	 * and with host's RCV_MSG_ACK cleared hw automatically clear host's RCV_MSG_ACK
	 * which lead to VF's TRN_MSG_ACK cleared, otherwise below xgpu_ai_poll_ack()
	 * will return immediatly
	 */
	do {
		xgpu_ai_mailbox_set_valid(adev, false);
		trn = xgpu_ai_peek_ack(adev);
		if (trn) {
			pr_err("trn=%x ACK should not assert! wait again !\n", trn);
			msleep(1);
		}
	} while(trn);

	reg = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
					     mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW0));
	reg = REG_SET_FIELD(reg, BIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW0,
			    MSGBUF_DATA, req);
	WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW0),
		      reg);
	WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW1),
				data1);
	WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW2),
				data2);
	WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_MSGBUF_TRN_DW3),
				data3);

	xgpu_ai_mailbox_set_valid(adev, true);

	/* start to poll ack */
	r = xgpu_ai_poll_ack(adev);
	if (r)
		pr_err("Doesn't get ack from pf, continue\n");

	xgpu_ai_mailbox_set_valid(adev, false);
}

static int xgpu_ai_send_access_requests(struct amdgpu_device *adev,
					enum idh_request req)
{
	int r;

	xgpu_ai_mailbox_trans_msg(adev, req, 0, 0, 0);

	/* start to check msg if request is idh_req_gpu_init_access */
	if (req == IDH_REQ_GPU_INIT_ACCESS ||
		req == IDH_REQ_GPU_FINI_ACCESS ||
		req == IDH_REQ_GPU_RESET_ACCESS) {
		r = xgpu_ai_poll_msg(adev, IDH_READY_TO_ACCESS_GPU);
		if (r) {
			pr_err("Doesn't get READY_TO_ACCESS_GPU from pf, give up\n");
			return r;
		}
		/* Retrieve checksum from mailbox2 */
		if (req == IDH_REQ_GPU_INIT_ACCESS) {
			adev->virt.fw_reserve.checksum_key =
				RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0,
					mmBIF_BX_PF0_MAILBOX_MSGBUF_RCV_DW2));
		}
	}

	return 0;
}

static int xgpu_ai_request_reset(struct amdgpu_device *adev)
{
	return xgpu_ai_send_access_requests(adev, IDH_REQ_GPU_RESET_ACCESS);
}

static int xgpu_ai_request_full_gpu_access(struct amdgpu_device *adev,
					   bool init)
{
	enum idh_request req;

	req = init ? IDH_REQ_GPU_INIT_ACCESS : IDH_REQ_GPU_FINI_ACCESS;
	return xgpu_ai_send_access_requests(adev, req);
}

static int xgpu_ai_release_full_gpu_access(struct amdgpu_device *adev,
					   bool init)
{
	enum idh_request req;
	int r = 0;

	req = init ? IDH_REL_GPU_INIT_ACCESS : IDH_REL_GPU_FINI_ACCESS;
	r = xgpu_ai_send_access_requests(adev, req);

	return r;
}

static int xgpu_ai_mailbox_ack_irq(struct amdgpu_device *adev,
					struct amdgpu_irq_src *source,
					struct amdgpu_iv_entry *entry)
{
	DRM_DEBUG("get ack intr and do nothing.\n");
	return 0;
}

static int xgpu_ai_set_mailbox_ack_irq(struct amdgpu_device *adev,
					struct amdgpu_irq_src *source,
					unsigned type,
					enum amdgpu_interrupt_state state)
{
	u32 tmp = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_INT_CNTL));

	tmp = REG_SET_FIELD(tmp, BIF_BX_PF0_MAILBOX_INT_CNTL, ACK_INT_EN,
				(state == AMDGPU_IRQ_STATE_ENABLE) ? 1 : 0);
	WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_INT_CNTL), tmp);

	return 0;
}

static void xgpu_ai_mailbox_flr_work(struct work_struct *work)
{
	struct amdgpu_virt *virt = container_of(work, struct amdgpu_virt, flr_work);
	struct amdgpu_device *adev = container_of(virt, struct amdgpu_device, virt);
	int timeout = AI_MAILBOX_POLL_FLR_TIMEDOUT;
	int locked;

	/* block amdgpu_gpu_recover till msg FLR COMPLETE received,
	 * otherwise the mailbox msg will be ruined/reseted by
	 * the VF FLR.
	 *
	 * we can unlock the lock_reset to allow "amdgpu_job_timedout"
	 * to run gpu_recover() after FLR_NOTIFICATION_CMPL received
	 * which means host side had finished this VF's FLR.
	 */
	locked = mutex_trylock(&adev->lock_reset);
	if (locked)
		adev->in_gpu_reset = 1;

	do {
		if (xgpu_ai_mailbox_peek_msg(adev) == IDH_FLR_NOTIFICATION_CMPL)
			goto flr_done;

		msleep(10);
		timeout -= 10;
	} while (timeout > 1);

flr_done:
	if (locked) {
		adev->in_gpu_reset = 0;
		mutex_unlock(&adev->lock_reset);
	}

	/* Trigger recovery for world switch failure if no TDR */
	if (amdgpu_lockup_timeout == 0)
		amdgpu_device_gpu_recover(adev, NULL, true);
}

static int xgpu_ai_set_mailbox_rcv_irq(struct amdgpu_device *adev,
				       struct amdgpu_irq_src *src,
				       unsigned type,
				       enum amdgpu_interrupt_state state)
{
	u32 tmp = RREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_INT_CNTL));

	tmp = REG_SET_FIELD(tmp, BIF_BX_PF0_MAILBOX_INT_CNTL, VALID_INT_EN,
			    (state == AMDGPU_IRQ_STATE_ENABLE) ? 1 : 0);
	WREG32_NO_KIQ(SOC15_REG_OFFSET(NBIO, 0, mmBIF_BX_PF0_MAILBOX_INT_CNTL), tmp);

	return 0;
}

static int xgpu_ai_mailbox_rcv_irq(struct amdgpu_device *adev,
				   struct amdgpu_irq_src *source,
				   struct amdgpu_iv_entry *entry)
{
	enum idh_event event = xgpu_ai_mailbox_peek_msg(adev);

	switch (event) {
		case IDH_FLR_NOTIFICATION:
		if (amdgpu_sriov_runtime(adev))
			schedule_work(&adev->virt.flr_work);
		break;
		/* READY_TO_ACCESS_GPU is fetched by kernel polling, IRQ can ignore
		 * it byfar since that polling thread will handle it,
		 * other msg like flr complete is not handled here.
		 */
		case IDH_CLR_MSG_BUF:
		case IDH_FLR_NOTIFICATION_CMPL:
		case IDH_READY_TO_ACCESS_GPU:
		default:
		break;
	}

	return 0;
}

static const struct amdgpu_irq_src_funcs xgpu_ai_mailbox_ack_irq_funcs = {
	.set = xgpu_ai_set_mailbox_ack_irq,
	.process = xgpu_ai_mailbox_ack_irq,
};

static const struct amdgpu_irq_src_funcs xgpu_ai_mailbox_rcv_irq_funcs = {
	.set = xgpu_ai_set_mailbox_rcv_irq,
	.process = xgpu_ai_mailbox_rcv_irq,
};

void xgpu_ai_mailbox_set_irq_funcs(struct amdgpu_device *adev)
{
	adev->virt.ack_irq.num_types = 1;
	adev->virt.ack_irq.funcs = &xgpu_ai_mailbox_ack_irq_funcs;
	adev->virt.rcv_irq.num_types = 1;
	adev->virt.rcv_irq.funcs = &xgpu_ai_mailbox_rcv_irq_funcs;
}

int xgpu_ai_mailbox_add_irq_id(struct amdgpu_device *adev)
{
	int r;

	r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_BIF, 135, &adev->virt.rcv_irq);
	if (r)
		return r;

	r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_BIF, 138, &adev->virt.ack_irq);
	if (r) {
		amdgpu_irq_put(adev, &adev->virt.rcv_irq, 0);
		return r;
	}

	return 0;
}

int xgpu_ai_mailbox_get_irq(struct amdgpu_device *adev)
{
	int r;

	r = amdgpu_irq_get(adev, &adev->virt.rcv_irq, 0);
	if (r)
		return r;
	r = amdgpu_irq_get(adev, &adev->virt.ack_irq, 0);
	if (r) {
		amdgpu_irq_put(adev, &adev->virt.rcv_irq, 0);
		return r;
	}

	INIT_WORK(&adev->virt.flr_work, xgpu_ai_mailbox_flr_work);

	return 0;
}

void xgpu_ai_mailbox_put_irq(struct amdgpu_device *adev)
{
	amdgpu_irq_put(adev, &adev->virt.ack_irq, 0);
	amdgpu_irq_put(adev, &adev->virt.rcv_irq, 0);
}

const struct amdgpu_virt_ops xgpu_ai_virt_ops = {
	.req_full_gpu	= xgpu_ai_request_full_gpu_access,
	.rel_full_gpu	= xgpu_ai_release_full_gpu_access,
	.reset_gpu = xgpu_ai_request_reset,
	.wait_reset = NULL,
	.trans_msg = xgpu_ai_mailbox_trans_msg,
};