// SPDX-License-Identifier: GPL-2.0
/*
 * camss-vfe-480.c
 *
 * Qualcomm MSM Camera Subsystem - VFE (Video Front End) Module v480 (SM8250)
 *
 * Copyright (C) 2020-2021 Linaro Ltd.
 * Copyright (C) 2021 Jonathan Marek
 */

#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>

#include "camss.h"
#include "camss-vfe.h"

/* VFE 2/3 are lite and have a different register layout */
#define IS_LITE		(vfe->id >= 2 ? 1 : 0)

#define VFE_HW_VERSION			(0x00)

#define VFE_GLOBAL_RESET_CMD		(IS_LITE ? 0x0c : 0x1c)
#define	    GLOBAL_RESET_HW_AND_REG	(IS_LITE ? BIT(1) : BIT(0))

#define VFE_REG_UPDATE_CMD		(IS_LITE ? 0x20 : 0x34)
static inline int reg_update_rdi(struct vfe_device *vfe, int n)
{
	return IS_LITE ? BIT(n) : BIT(1 + (n));
}

#define	    REG_UPDATE_RDI		reg_update_rdi
#define VFE_IRQ_CMD			(IS_LITE ? 0x24 : 0x38)
#define     IRQ_CMD_GLOBAL_CLEAR	BIT(0)

#define VFE_IRQ_MASK(n)			((IS_LITE ? 0x28 : 0x3c) + (n) * 4)
#define	    IRQ_MASK_0_RESET_ACK	(IS_LITE ? BIT(17) : BIT(0))
#define	    IRQ_MASK_0_BUS_TOP_IRQ	(IS_LITE ? BIT(4) : BIT(7))
#define VFE_IRQ_CLEAR(n)		((IS_LITE ? 0x34 : 0x48) + (n) * 4)
#define VFE_IRQ_STATUS(n)		((IS_LITE ? 0x40 : 0x54) + (n) * 4)

#define BUS_REG_BASE			(IS_LITE ? 0x1a00 : 0xaa00)

#define VFE_BUS_WM_CGC_OVERRIDE		(BUS_REG_BASE + 0x08)
#define		WM_CGC_OVERRIDE_ALL	(0x3FFFFFF)

#define VFE_BUS_WM_TEST_BUS_CTRL	(BUS_REG_BASE + 0xdc)

#define VFE_BUS_IRQ_MASK(n)		(BUS_REG_BASE + 0x18 + (n) * 4)
static inline int bus_irq_mask_0_rdi_rup(struct vfe_device *vfe, int n)
{
	return IS_LITE ? BIT(n) : BIT(3 + (n));
}

#define     BUS_IRQ_MASK_0_RDI_RUP	bus_irq_mask_0_rdi_rup
static inline int bus_irq_mask_0_comp_done(struct vfe_device *vfe, int n)
{
	return IS_LITE ? BIT(4 + (n)) : BIT(6 + (n));
}

#define     BUS_IRQ_MASK_0_COMP_DONE	bus_irq_mask_0_comp_done
#define VFE_BUS_IRQ_CLEAR(n)		(BUS_REG_BASE + 0x20 + (n) * 4)
#define VFE_BUS_IRQ_STATUS(n)		(BUS_REG_BASE + 0x28 + (n) * 4)
#define VFE_BUS_IRQ_CLEAR_GLOBAL	(BUS_REG_BASE + 0x30)

#define VFE_BUS_WM_CFG(n)		(BUS_REG_BASE + 0x200 + (n) * 0x100)
#define		WM_CFG_EN			(0)
#define		WM_CFG_MODE			(16)
#define			MODE_QCOM_PLAIN	(0)
#define			MODE_MIPI_RAW	(1)
#define VFE_BUS_WM_IMAGE_ADDR(n)	(BUS_REG_BASE + 0x204 + (n) * 0x100)
#define VFE_BUS_WM_FRAME_INCR(n)	(BUS_REG_BASE + 0x208 + (n) * 0x100)
#define VFE_BUS_WM_IMAGE_CFG_0(n)	(BUS_REG_BASE + 0x20c + (n) * 0x100)
#define		WM_IMAGE_CFG_0_DEFAULT_WIDTH	(0xFFFF)
#define VFE_BUS_WM_IMAGE_CFG_1(n)	(BUS_REG_BASE + 0x210 + (n) * 0x100)
#define VFE_BUS_WM_IMAGE_CFG_2(n)	(BUS_REG_BASE + 0x214 + (n) * 0x100)
#define VFE_BUS_WM_PACKER_CFG(n)	(BUS_REG_BASE + 0x218 + (n) * 0x100)
#define VFE_BUS_WM_HEADER_ADDR(n)	(BUS_REG_BASE + 0x220 + (n) * 0x100)
#define VFE_BUS_WM_HEADER_INCR(n)	(BUS_REG_BASE + 0x224 + (n) * 0x100)
#define VFE_BUS_WM_HEADER_CFG(n)	(BUS_REG_BASE + 0x228 + (n) * 0x100)

#define VFE_BUS_WM_IRQ_SUBSAMPLE_PERIOD(n)	(BUS_REG_BASE + 0x230 + (n) * 0x100)
#define VFE_BUS_WM_IRQ_SUBSAMPLE_PATTERN(n)	(BUS_REG_BASE + 0x234 + (n) * 0x100)
#define VFE_BUS_WM_FRAMEDROP_PERIOD(n)		(BUS_REG_BASE + 0x238 + (n) * 0x100)
#define VFE_BUS_WM_FRAMEDROP_PATTERN(n)		(BUS_REG_BASE + 0x23c + (n) * 0x100)

#define VFE_BUS_WM_SYSTEM_CACHE_CFG(n)	(BUS_REG_BASE + 0x260 + (n) * 0x100)
#define VFE_BUS_WM_BURST_LIMIT(n)	(BUS_REG_BASE + 0x264 + (n) * 0x100)

/* for titan 480, each bus client is hardcoded to a specific path
 * and each bus client is part of a hardcoded "comp group"
 */
#define RDI_WM(n)			((IS_LITE ? 0 : 23) + (n))
#define RDI_COMP_GROUP(n)		((IS_LITE ? 0 : 11) + (n))

static u32 vfe_hw_version(struct vfe_device *vfe)
{
	u32 hw_version = readl_relaxed(vfe->base + VFE_HW_VERSION);

	u32 gen = (hw_version >> 28) & 0xF;
	u32 rev = (hw_version >> 16) & 0xFFF;
	u32 step = hw_version & 0xFFFF;

	dev_dbg(vfe->camss->dev, "VFE HW Version = %u.%u.%u\n", gen, rev, step);

	return hw_version;
}

static void vfe_global_reset(struct vfe_device *vfe)
{
	writel_relaxed(IRQ_MASK_0_RESET_ACK, vfe->base + VFE_IRQ_MASK(0));
	writel_relaxed(GLOBAL_RESET_HW_AND_REG, vfe->base + VFE_GLOBAL_RESET_CMD);
}

static void vfe_wm_start(struct vfe_device *vfe, u8 wm, struct vfe_line *line)
{
	struct v4l2_pix_format_mplane *pix =
		&line->video_out.active_fmt.fmt.pix_mp;

	wm = RDI_WM(wm); /* map to actual WM used (from wm=RDI index) */

	/* no clock gating at bus input */
	writel_relaxed(WM_CGC_OVERRIDE_ALL, vfe->base + VFE_BUS_WM_CGC_OVERRIDE);

	writel_relaxed(0x0, vfe->base + VFE_BUS_WM_TEST_BUS_CTRL);

	writel_relaxed(pix->plane_fmt[0].bytesperline * pix->height,
		       vfe->base + VFE_BUS_WM_FRAME_INCR(wm));
	writel_relaxed(0xf, vfe->base + VFE_BUS_WM_BURST_LIMIT(wm));
	writel_relaxed(WM_IMAGE_CFG_0_DEFAULT_WIDTH,
		       vfe->base + VFE_BUS_WM_IMAGE_CFG_0(wm));
	writel_relaxed(pix->plane_fmt[0].bytesperline,
		       vfe->base + VFE_BUS_WM_IMAGE_CFG_2(wm));
	writel_relaxed(0, vfe->base + VFE_BUS_WM_PACKER_CFG(wm));

	/* no dropped frames, one irq per frame */
	writel_relaxed(0, vfe->base + VFE_BUS_WM_FRAMEDROP_PERIOD(wm));
	writel_relaxed(1, vfe->base + VFE_BUS_WM_FRAMEDROP_PATTERN(wm));
	writel_relaxed(0, vfe->base + VFE_BUS_WM_IRQ_SUBSAMPLE_PERIOD(wm));
	writel_relaxed(1, vfe->base + VFE_BUS_WM_IRQ_SUBSAMPLE_PATTERN(wm));

	writel_relaxed(1 << WM_CFG_EN | MODE_MIPI_RAW << WM_CFG_MODE,
		       vfe->base + VFE_BUS_WM_CFG(wm));
}

static void vfe_wm_stop(struct vfe_device *vfe, u8 wm)
{
	wm = RDI_WM(wm); /* map to actual WM used (from wm=RDI index) */
	writel_relaxed(0, vfe->base + VFE_BUS_WM_CFG(wm));
}

static void vfe_wm_update(struct vfe_device *vfe, u8 wm, u32 addr,
			  struct vfe_line *line)
{
	wm = RDI_WM(wm); /* map to actual WM used (from wm=RDI index) */
	writel_relaxed(addr, vfe->base + VFE_BUS_WM_IMAGE_ADDR(wm));
}

static void vfe_reg_update(struct vfe_device *vfe, enum vfe_line_id line_id)
{
	vfe->reg_update |= REG_UPDATE_RDI(vfe, line_id);
	writel_relaxed(vfe->reg_update, vfe->base + VFE_REG_UPDATE_CMD);
}

static inline void vfe_reg_update_clear(struct vfe_device *vfe,
					enum vfe_line_id line_id)
{
	vfe->reg_update &= ~REG_UPDATE_RDI(vfe, line_id);
}

static void vfe_enable_irq_common(struct vfe_device *vfe)
{
	/* enable only the IRQs used: rup and comp_done irqs for RDI0 */
	writel_relaxed(IRQ_MASK_0_RESET_ACK | IRQ_MASK_0_BUS_TOP_IRQ,
		       vfe->base + VFE_IRQ_MASK(0));
	writel_relaxed(BUS_IRQ_MASK_0_RDI_RUP(vfe, 0) |
		       BUS_IRQ_MASK_0_COMP_DONE(vfe, RDI_COMP_GROUP(0)),
		       vfe->base + VFE_BUS_IRQ_MASK(0));
}

static void vfe_isr_reg_update(struct vfe_device *vfe, enum vfe_line_id line_id);
static void vfe_isr_wm_done(struct vfe_device *vfe, u8 wm);

/*
 * vfe_isr - VFE module interrupt handler
 * @irq: Interrupt line
 * @dev: VFE device
 *
 * Return IRQ_HANDLED on success
 */
static irqreturn_t vfe_isr(int irq, void *dev)
{
	struct vfe_device *vfe = dev;
	u32 status;

	status = readl_relaxed(vfe->base + VFE_IRQ_STATUS(0));
	writel_relaxed(status, vfe->base + VFE_IRQ_CLEAR(0));
	writel_relaxed(IRQ_CMD_GLOBAL_CLEAR, vfe->base + VFE_IRQ_CMD);

	if (status & IRQ_MASK_0_RESET_ACK)
		vfe_isr_reset_ack(vfe);

	if (status & IRQ_MASK_0_BUS_TOP_IRQ) {
		u32 status = readl_relaxed(vfe->base + VFE_BUS_IRQ_STATUS(0));

		writel_relaxed(status, vfe->base + VFE_BUS_IRQ_CLEAR(0));
		writel_relaxed(1, vfe->base + VFE_BUS_IRQ_CLEAR_GLOBAL);

		if (status & BUS_IRQ_MASK_0_RDI_RUP(vfe, 0))
			vfe_isr_reg_update(vfe, 0);

		if (status & BUS_IRQ_MASK_0_COMP_DONE(vfe, RDI_COMP_GROUP(0)))
			vfe_isr_wm_done(vfe, 0);
	}

	return IRQ_HANDLED;
}

/*
 * vfe_halt - Trigger halt on VFE module and wait to complete
 * @vfe: VFE device
 *
 * Return 0 on success or a negative error code otherwise
 */
static int vfe_halt(struct vfe_device *vfe)
{
	/* rely on vfe_disable_output() to stop the VFE */
	return 0;
}

static int vfe_get_output(struct vfe_line *line)
{
	struct vfe_device *vfe = to_vfe(line);
	struct vfe_output *output;
	unsigned long flags;
	int wm_idx;

	spin_lock_irqsave(&vfe->output_lock, flags);

	output = &line->output;
	if (output->state != VFE_OUTPUT_OFF) {
		dev_err(vfe->camss->dev, "Output is running\n");
		goto error;
	}

	output->wm_num = 1;

	wm_idx = vfe_reserve_wm(vfe, line->id);
	if (wm_idx < 0) {
		dev_err(vfe->camss->dev, "Can not reserve wm\n");
		goto error_get_wm;
	}
	output->wm_idx[0] = wm_idx;

	output->drop_update_idx = 0;

	spin_unlock_irqrestore(&vfe->output_lock, flags);

	return 0;

error_get_wm:
	vfe_release_wm(vfe, output->wm_idx[0]);
	output->state = VFE_OUTPUT_OFF;
error:
	spin_unlock_irqrestore(&vfe->output_lock, flags);

	return -EINVAL;
}

static int vfe_enable_output(struct vfe_line *line)
{
	struct vfe_device *vfe = to_vfe(line);
	struct vfe_output *output = &line->output;
	unsigned long flags;
	unsigned int i;

	spin_lock_irqsave(&vfe->output_lock, flags);

	vfe_reg_update_clear(vfe, line->id);

	if (output->state != VFE_OUTPUT_OFF) {
		dev_err(vfe->camss->dev, "Output is not in reserved state %d\n",
			output->state);
		spin_unlock_irqrestore(&vfe->output_lock, flags);
		return -EINVAL;
	}

	WARN_ON(output->gen2.active_num);

	output->state = VFE_OUTPUT_ON;

	output->sequence = 0;
	output->wait_reg_update = 0;
	reinit_completion(&output->reg_update);

	vfe_wm_start(vfe, output->wm_idx[0], line);

	for (i = 0; i < 2; i++) {
		output->buf[i] = vfe_buf_get_pending(output);
		if (!output->buf[i])
			break;
		output->gen2.active_num++;
		vfe_wm_update(vfe, output->wm_idx[0], output->buf[i]->addr[0], line);
	}

	vfe_reg_update(vfe, line->id);

	spin_unlock_irqrestore(&vfe->output_lock, flags);

	return 0;
}

static int vfe_disable_output(struct vfe_line *line)
{
	struct vfe_device *vfe = to_vfe(line);
	struct vfe_output *output = &line->output;
	unsigned long flags;
	unsigned int i;
	bool done;
	int timeout = 0;

	do {
		spin_lock_irqsave(&vfe->output_lock, flags);
		done = !output->gen2.active_num;
		spin_unlock_irqrestore(&vfe->output_lock, flags);
		usleep_range(10000, 20000);

		if (timeout++ == 100) {
			dev_err(vfe->camss->dev, "VFE idle timeout - resetting\n");
			vfe_reset(vfe);
			output->gen2.active_num = 0;
			return 0;
		}
	} while (!done);

	spin_lock_irqsave(&vfe->output_lock, flags);
	for (i = 0; i < output->wm_num; i++)
		vfe_wm_stop(vfe, output->wm_idx[i]);
	spin_unlock_irqrestore(&vfe->output_lock, flags);

	return 0;
}

/*
 * vfe_enable - Enable streaming on VFE line
 * @line: VFE line
 *
 * Return 0 on success or a negative error code otherwise
 */
static int vfe_enable(struct vfe_line *line)
{
	struct vfe_device *vfe = to_vfe(line);
	int ret;

	mutex_lock(&vfe->stream_lock);

	if (!vfe->stream_count)
		vfe_enable_irq_common(vfe);

	vfe->stream_count++;

	mutex_unlock(&vfe->stream_lock);

	ret = vfe_get_output(line);
	if (ret < 0)
		goto error_get_output;

	ret = vfe_enable_output(line);
	if (ret < 0)
		goto error_enable_output;

	vfe->was_streaming = 1;

	return 0;

error_enable_output:
	vfe_put_output(line);

error_get_output:
	mutex_lock(&vfe->stream_lock);

	vfe->stream_count--;

	mutex_unlock(&vfe->stream_lock);

	return ret;
}

/*
 * vfe_disable - Disable streaming on VFE line
 * @line: VFE line
 *
 * Return 0 on success or a negative error code otherwise
 */
static int vfe_disable(struct vfe_line *line)
{
	struct vfe_device *vfe = to_vfe(line);

	vfe_disable_output(line);

	vfe_put_output(line);

	mutex_lock(&vfe->stream_lock);

	vfe->stream_count--;

	mutex_unlock(&vfe->stream_lock);

	return 0;
}

/*
 * vfe_isr_reg_update - Process reg update interrupt
 * @vfe: VFE Device
 * @line_id: VFE line
 */
static void vfe_isr_reg_update(struct vfe_device *vfe, enum vfe_line_id line_id)
{
	struct vfe_output *output;
	unsigned long flags;

	spin_lock_irqsave(&vfe->output_lock, flags);
	vfe_reg_update_clear(vfe, line_id);

	output = &vfe->line[line_id].output;

	if (output->wait_reg_update) {
		output->wait_reg_update = 0;
		complete(&output->reg_update);
	}

	spin_unlock_irqrestore(&vfe->output_lock, flags);
}

/*
 * vfe_isr_wm_done - Process write master done interrupt
 * @vfe: VFE Device
 * @wm: Write master id
 */
static void vfe_isr_wm_done(struct vfe_device *vfe, u8 wm)
{
	struct vfe_line *line = &vfe->line[vfe->wm_output_map[wm]];
	struct camss_buffer *ready_buf;
	struct vfe_output *output;
	unsigned long flags;
	u32 index;
	u64 ts = ktime_get_ns();

	spin_lock_irqsave(&vfe->output_lock, flags);

	if (vfe->wm_output_map[wm] == VFE_LINE_NONE) {
		dev_err_ratelimited(vfe->camss->dev,
				    "Received wm done for unmapped index\n");
		goto out_unlock;
	}
	output = &vfe->line[vfe->wm_output_map[wm]].output;

	ready_buf = output->buf[0];
	if (!ready_buf) {
		dev_err_ratelimited(vfe->camss->dev,
				    "Missing ready buf %d!\n", output->state);
		goto out_unlock;
	}

	ready_buf->vb.vb2_buf.timestamp = ts;
	ready_buf->vb.sequence = output->sequence++;

	index = 0;
	output->buf[0] = output->buf[1];
	if (output->buf[0])
		index = 1;

	output->buf[index] = vfe_buf_get_pending(output);

	if (output->buf[index])
		vfe_wm_update(vfe, output->wm_idx[0], output->buf[index]->addr[0], line);
	else
		output->gen2.active_num--;

	spin_unlock_irqrestore(&vfe->output_lock, flags);

	vb2_buffer_done(&ready_buf->vb.vb2_buf, VB2_BUF_STATE_DONE);

	return;

out_unlock:
	spin_unlock_irqrestore(&vfe->output_lock, flags);
}

/*
 * vfe_pm_domain_off - Disable power domains specific to this VFE.
 * @vfe: VFE Device
 */
static void vfe_pm_domain_off(struct vfe_device *vfe)
{
	/* nop */
}

/*
 * vfe_pm_domain_on - Enable power domains specific to this VFE.
 * @vfe: VFE Device
 */
static int vfe_pm_domain_on(struct vfe_device *vfe)
{
	return 0;
}

/*
 * vfe_queue_buffer - Add empty buffer
 * @vid: Video device structure
 * @buf: Buffer to be enqueued
 *
 * Add an empty buffer - depending on the current number of buffers it will be
 * put in pending buffer queue or directly given to the hardware to be filled.
 *
 * Return 0 on success or a negative error code otherwise
 */
static int vfe_queue_buffer(struct camss_video *vid,
			    struct camss_buffer *buf)
{
	struct vfe_line *line = container_of(vid, struct vfe_line, video_out);
	struct vfe_device *vfe = to_vfe(line);
	struct vfe_output *output;
	unsigned long flags;

	output = &line->output;

	spin_lock_irqsave(&vfe->output_lock, flags);

	if (output->state == VFE_OUTPUT_ON && output->gen2.active_num < 2) {
		output->buf[output->gen2.active_num++] = buf;
		vfe_wm_update(vfe, output->wm_idx[0], buf->addr[0], line);
	} else {
		vfe_buf_add_pending(output, buf);
	}

	spin_unlock_irqrestore(&vfe->output_lock, flags);

	return 0;
}

static const struct camss_video_ops vfe_video_ops_480 = {
	.queue_buffer = vfe_queue_buffer,
	.flush_buffers = vfe_flush_buffers,
};

static void vfe_subdev_init(struct device *dev, struct vfe_device *vfe)
{
	vfe->video_ops = vfe_video_ops_480;
	vfe->line_num = 1;
}

const struct vfe_hw_ops vfe_ops_480 = {
	.global_reset = vfe_global_reset,
	.hw_version = vfe_hw_version,
	.isr = vfe_isr,
	.pm_domain_off = vfe_pm_domain_off,
	.pm_domain_on = vfe_pm_domain_on,
	.subdev_init = vfe_subdev_init,
	.vfe_disable = vfe_disable,
	.vfe_enable = vfe_enable,
	.vfe_halt = vfe_halt,
};