drivers/media/platform/qcom/camss/camss-vfe-480.c

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

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

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

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

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

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

#define BUS_REG_BASE			(vfe_is_lite(vfe) ? 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 vfe_is_lite(vfe) ? 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 vfe_is_lite(vfe) ? 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)			((vfe_is_lite(vfe) ? 0 : 23) + (n))
#define RDI_COMP_GROUP(n)		((vfe_is_lite(vfe) ? 0 : 11) + (n))

#define MAX_VFE_OUTPUT_LINES	4

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(struct vfe_device *vfe)
{
	int i;
	u32 bus_irq_mask = 0;

	if (!vfe->stream_count)
		/* enable reset ack IRQ and top BUS status IRQ */
		writel(IRQ_MASK_0_RESET_ACK | IRQ_MASK_0_BUS_TOP_IRQ,
		       vfe->base + VFE_IRQ_MASK(0));

	for (i = 0; i < MAX_VFE_OUTPUT_LINES; i++) {
		/* Enable IRQ for newly added lines, but also keep already running lines's IRQ */
		if (vfe->line[i].output.state == VFE_OUTPUT_RESERVED ||
		    vfe->line[i].output.state == VFE_OUTPUT_ON) {
			bus_irq_mask |= BUS_IRQ_MASK_0_RDI_RUP(vfe, i)
					| BUS_IRQ_MASK_0_COMP_DONE(vfe, RDI_COMP_GROUP(i));
			}
	}

	writel(bus_irq_mask, vfe->base + VFE_BUS_IRQ_MASK(0));
}

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

/*
 * 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;
	int i;

	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);

		/* Loop through all WMs IRQs */
		for (i = 0; i < MSM_VFE_IMAGE_MASTERS_NUM; i++) {
			if (status & BUS_IRQ_MASK_0_RDI_RUP(vfe, i))
				vfe_isr_reg_update(vfe, i);

			if (status & BUS_IRQ_MASK_0_COMP_DONE(vfe, RDI_COMP_GROUP(i)))
				vfe_buf_done(vfe, i);
		}
	}

	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;
}

/*
 * 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);
}

static const struct camss_video_ops vfe_video_ops_480 = {
	.queue_buffer = vfe_queue_buffer_v2,
	.flush_buffers = vfe_flush_buffers,
};

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

static void vfe_isr_read(struct vfe_device *vfe, u32 *value0, u32 *value1)
{
	/* nop */
}

static void vfe_violation_read(struct vfe_device *vfe)
{
	/* nop */
}

static void vfe_buf_done_480(struct vfe_device *vfe, int port_id)
{
	/* nop */
}

const struct vfe_hw_ops vfe_ops_480 = {
	.enable_irq = vfe_enable_irq,
	.global_reset = vfe_global_reset,
	.hw_version = vfe_hw_version,
	.isr = vfe_isr,
	.isr_read = vfe_isr_read,
	.reg_update = vfe_reg_update,
	.reg_update_clear = vfe_reg_update_clear,
	.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_v2,
	.vfe_halt = vfe_halt,
	.violation_read = vfe_violation_read,
	.vfe_wm_start = vfe_wm_start,
	.vfe_wm_stop = vfe_wm_stop,
	.vfe_buf_done = vfe_buf_done_480,
	.vfe_wm_update = vfe_wm_update,
};