path: root/drivers/gpu/drm/sysfb/ofdrm.c

// SPDX-License-Identifier: GPL-2.0-only

#include <linux/aperture.h>
#include <linux/of_address.h>
#include <linux/pci.h>
#include <linux/platform_device.h>

#include <drm/clients/drm_client_setup.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_color_mgmt.h>
#include <drm/drm_connector.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include <drm/drm_fbdev_shmem.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>

#include "drm_sysfb_helper.h"

#define DRIVER_NAME	"ofdrm"
#define DRIVER_DESC	"DRM driver for OF platform devices"
#define DRIVER_MAJOR	1
#define DRIVER_MINOR	0

#define PCI_VENDOR_ID_ATI_R520	0x7100
#define PCI_VENDOR_ID_ATI_R600	0x9400

#define OFDRM_GAMMA_LUT_SIZE	256

/* Definitions used by the Avivo palette  */
#define AVIVO_DC_LUT_RW_SELECT                  0x6480
#define AVIVO_DC_LUT_RW_MODE                    0x6484
#define AVIVO_DC_LUT_RW_INDEX                   0x6488
#define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
#define AVIVO_DC_LUT_PWL_DATA                   0x6490
#define AVIVO_DC_LUT_30_COLOR                   0x6494
#define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
#define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
#define AVIVO_DC_LUT_AUTOFILL                   0x64a0
#define AVIVO_DC_LUTA_CONTROL                   0x64c0
#define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
#define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
#define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
#define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
#define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
#define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8
#define AVIVO_DC_LUTB_CONTROL                   0x6cc0
#define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
#define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
#define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
#define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
#define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
#define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8

enum ofdrm_model {
	OFDRM_MODEL_UNKNOWN,
	OFDRM_MODEL_MACH64, /* ATI Mach64 */
	OFDRM_MODEL_RAGE128, /* ATI Rage128 */
	OFDRM_MODEL_RAGE_M3A, /* ATI Rage Mobility M3 Head A */
	OFDRM_MODEL_RAGE_M3B, /* ATI Rage Mobility M3 Head B */
	OFDRM_MODEL_RADEON, /* ATI Radeon */
	OFDRM_MODEL_GXT2000, /* IBM GXT2000 */
	OFDRM_MODEL_AVIVO, /* ATI R5xx */
	OFDRM_MODEL_QEMU, /* QEMU VGA */
};

/*
 * Helpers for display nodes
 */

static int display_get_validated_int(struct drm_device *dev, const char *name, uint32_t value)
{
	return drm_sysfb_get_validated_int(dev, name, value, INT_MAX);
}

static int display_get_validated_int0(struct drm_device *dev, const char *name, uint32_t value)
{
	return drm_sysfb_get_validated_int0(dev, name, value, INT_MAX);
}

static const struct drm_format_info *display_get_validated_format(struct drm_device *dev,
								  u32 depth, bool big_endian)
{
	const struct drm_format_info *info;
	u32 format;

	switch (depth) {
	case 8:
		format = drm_mode_legacy_fb_format(8, 8);
		break;
	case 15:
	case 16:
		format = drm_mode_legacy_fb_format(16, depth);
		break;
	case 32:
		format = drm_mode_legacy_fb_format(32, 24);
		break;
	default:
		drm_err(dev, "unsupported framebuffer depth %u\n", depth);
		return ERR_PTR(-EINVAL);
	}

	/*
	 * DRM formats assume little-endian byte order. Update the format
	 * if the scanout buffer uses big-endian ordering.
	 */
	if (big_endian) {
		switch (format) {
		case DRM_FORMAT_XRGB8888:
			format = DRM_FORMAT_BGRX8888;
			break;
		case DRM_FORMAT_ARGB8888:
			format = DRM_FORMAT_BGRA8888;
			break;
		case DRM_FORMAT_RGB565:
			format = DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN;
			break;
		case DRM_FORMAT_XRGB1555:
			format = DRM_FORMAT_XRGB1555 | DRM_FORMAT_BIG_ENDIAN;
			break;
		default:
			break;
		}
	}

	info = drm_format_info(format);
	if (!info) {
		drm_err(dev, "cannot find framebuffer format for depth %u\n", depth);
		return ERR_PTR(-EINVAL);
	}

	return info;
}

static int