556 lines
15 KiB
C
556 lines
15 KiB
C
/*
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* Copyright (C) 2015 Free Electrons
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* Copyright (C) 2015 NextThing Co
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*
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_fb_cma_helper.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_plane_helper.h>
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#include <linux/component.h>
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#include <linux/list.h>
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#include <linux/of_device.h>
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#include <linux/of_graph.h>
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#include <linux/reset.h>
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#include "sun4i_backend.h"
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#include "sun4i_drv.h"
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#include "sun4i_layer.h"
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#include "sunxi_engine.h"
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struct sun4i_backend_quirks {
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/* backend <-> TCON muxing selection done in backend */
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bool needs_output_muxing;
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};
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static const u32 sunxi_rgb2yuv_coef[12] = {
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0x00000107, 0x00000204, 0x00000064, 0x00000108,
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0x00003f69, 0x00003ed6, 0x000001c1, 0x00000808,
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0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808
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};
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static void sun4i_backend_apply_color_correction(struct sunxi_engine *engine)
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{
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int i;
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DRM_DEBUG_DRIVER("Applying RGB to YUV color correction\n");
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/* Set color correction */
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regmap_write(engine->regs, SUN4I_BACKEND_OCCTL_REG,
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SUN4I_BACKEND_OCCTL_ENABLE);
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for (i = 0; i < 12; i++)
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regmap_write(engine->regs, SUN4I_BACKEND_OCRCOEF_REG(i),
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sunxi_rgb2yuv_coef[i]);
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}
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static void sun4i_backend_disable_color_correction(struct sunxi_engine *engine)
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{
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DRM_DEBUG_DRIVER("Disabling color correction\n");
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/* Disable color correction */
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regmap_update_bits(engine->regs, SUN4I_BACKEND_OCCTL_REG,
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SUN4I_BACKEND_OCCTL_ENABLE, 0);
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}
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static void sun4i_backend_commit(struct sunxi_engine *engine)
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{
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DRM_DEBUG_DRIVER("Committing changes\n");
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regmap_write(engine->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
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SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS |
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SUN4I_BACKEND_REGBUFFCTL_LOADCTL);
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}
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void sun4i_backend_layer_enable(struct sun4i_backend *backend,
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int layer, bool enable)
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{
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u32 val;
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DRM_DEBUG_DRIVER("%sabling layer %d\n", enable ? "En" : "Dis",
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layer);
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if (enable)
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val = SUN4I_BACKEND_MODCTL_LAY_EN(layer);
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else
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val = 0;
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regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
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SUN4I_BACKEND_MODCTL_LAY_EN(layer), val);
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}
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static int sun4i_backend_drm_format_to_layer(struct drm_plane *plane,
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u32 format, u32 *mode)
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{
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if ((plane->type == DRM_PLANE_TYPE_PRIMARY) &&
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(format == DRM_FORMAT_ARGB8888))
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format = DRM_FORMAT_XRGB8888;
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switch (format) {
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case DRM_FORMAT_ARGB8888:
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*mode = SUN4I_BACKEND_LAY_FBFMT_ARGB8888;
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break;
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case DRM_FORMAT_ARGB4444:
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*mode = SUN4I_BACKEND_LAY_FBFMT_ARGB4444;
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break;
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case DRM_FORMAT_ARGB1555:
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*mode = SUN4I_BACKEND_LAY_FBFMT_ARGB1555;
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break;
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case DRM_FORMAT_RGBA5551:
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*mode = SUN4I_BACKEND_LAY_FBFMT_RGBA5551;
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break;
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case DRM_FORMAT_RGBA4444:
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*mode = SUN4I_BACKEND_LAY_FBFMT_RGBA4444;
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break;
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case DRM_FORMAT_XRGB8888:
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*mode = SUN4I_BACKEND_LAY_FBFMT_XRGB8888;
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break;
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case DRM_FORMAT_RGB888:
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*mode = SUN4I_BACKEND_LAY_FBFMT_RGB888;
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break;
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case DRM_FORMAT_RGB565:
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*mode = SUN4I_BACKEND_LAY_FBFMT_RGB565;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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int sun4i_backend_update_layer_coord(struct sun4i_backend *backend,
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int layer, struct drm_plane *plane)
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{
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struct drm_plane_state *state = plane->state;
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struct drm_framebuffer *fb = state->fb;
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DRM_DEBUG_DRIVER("Updating layer %d\n", layer);
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if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
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DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H: %u\n",
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state->crtc_w, state->crtc_h);
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regmap_write(backend->engine.regs, SUN4I_BACKEND_DISSIZE_REG,
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SUN4I_BACKEND_DISSIZE(state->crtc_w,
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state->crtc_h));
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}
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/* Set the line width */
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DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8);
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regmap_write(backend->engine.regs,
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SUN4I_BACKEND_LAYLINEWIDTH_REG(layer),
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fb->pitches[0] * 8);
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/* Set height and width */
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DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n",
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state->crtc_w, state->crtc_h);
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regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYSIZE_REG(layer),
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SUN4I_BACKEND_LAYSIZE(state->crtc_w,
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state->crtc_h));
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/* Set base coordinates */
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DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
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state->crtc_x, state->crtc_y);
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regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYCOOR_REG(layer),
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SUN4I_BACKEND_LAYCOOR(state->crtc_x,
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state->crtc_y));
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return 0;
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}
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int sun4i_backend_update_layer_formats(struct sun4i_backend *backend,
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int layer, struct drm_plane *plane)
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{
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struct drm_plane_state *state = plane->state;
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struct drm_framebuffer *fb = state->fb;
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bool interlaced = false;
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u32 val;
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int ret;
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if (plane->state->crtc)
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interlaced = plane->state->crtc->state->adjusted_mode.flags
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& DRM_MODE_FLAG_INTERLACE;
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regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
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SUN4I_BACKEND_MODCTL_ITLMOD_EN,
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interlaced ? SUN4I_BACKEND_MODCTL_ITLMOD_EN : 0);
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DRM_DEBUG_DRIVER("Switching display backend interlaced mode %s\n",
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interlaced ? "on" : "off");
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ret = sun4i_backend_drm_format_to_layer(plane, fb->format->format,
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&val);
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if (ret) {
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DRM_DEBUG_DRIVER("Invalid format\n");
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return ret;
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}
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regmap_update_bits(backend->engine.regs,
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SUN4I_BACKEND_ATTCTL_REG1(layer),
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SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val);
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return 0;
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}
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int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend,
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int layer, struct drm_plane *plane)
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{
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struct drm_plane_state *state = plane->state;
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struct drm_framebuffer *fb = state->fb;
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u32 lo_paddr, hi_paddr;
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dma_addr_t paddr;
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/* Get the start of the displayed memory */
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paddr = drm_fb_cma_get_gem_addr(fb, state, 0);
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DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr);
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/*
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* backend DMA accesses DRAM directly, bypassing the system
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* bus. As such, the address range is different and the buffer
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* address needs to be corrected.
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*/
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paddr -= PHYS_OFFSET;
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/* Write the 32 lower bits of the address (in bits) */
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lo_paddr = paddr << 3;
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DRM_DEBUG_DRIVER("Setting address lower bits to 0x%x\n", lo_paddr);
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regmap_write(backend->engine.regs,
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SUN4I_BACKEND_LAYFB_L32ADD_REG(layer),
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lo_paddr);
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/* And the upper bits */
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hi_paddr = paddr >> 29;
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DRM_DEBUG_DRIVER("Setting address high bits to 0x%x\n", hi_paddr);
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regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_LAYFB_H4ADD_REG,
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SUN4I_BACKEND_LAYFB_H4ADD_MSK(layer),
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SUN4I_BACKEND_LAYFB_H4ADD(layer, hi_paddr));
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return 0;
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}
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static int sun4i_backend_init_sat(struct device *dev) {
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struct sun4i_backend *backend = dev_get_drvdata(dev);
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int ret;
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backend->sat_reset = devm_reset_control_get(dev, "sat");
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if (IS_ERR(backend->sat_reset)) {
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dev_err(dev, "Couldn't get the SAT reset line\n");
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return PTR_ERR(backend->sat_reset);
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}
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ret = reset_control_deassert(backend->sat_reset);
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if (ret) {
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dev_err(dev, "Couldn't deassert the SAT reset line\n");
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return ret;
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}
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backend->sat_clk = devm_clk_get(dev, "sat");
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if (IS_ERR(backend->sat_clk)) {
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dev_err(dev, "Couldn't get our SAT clock\n");
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ret = PTR_ERR(backend->sat_clk);
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goto err_assert_reset;
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}
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ret = clk_prepare_enable(backend->sat_clk);
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if (ret) {
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dev_err(dev, "Couldn't enable the SAT clock\n");
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return ret;
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}
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return 0;
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err_assert_reset:
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reset_control_assert(backend->sat_reset);
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return ret;
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}
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static int sun4i_backend_free_sat(struct device *dev) {
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struct sun4i_backend *backend = dev_get_drvdata(dev);
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clk_disable_unprepare(backend->sat_clk);
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reset_control_assert(backend->sat_reset);
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return 0;
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}
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/*
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* The display backend can take video output from the display frontend, or
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* the display enhancement unit on the A80, as input for one it its layers.
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* This relationship within the display pipeline is encoded in the device
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* tree with of_graph, and we use it here to figure out which backend, if
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* there are 2 or more, we are currently probing. The number would be in
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* the "reg" property of the upstream output port endpoint.
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*/
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static int sun4i_backend_of_get_id(struct device_node *node)
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{
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struct device_node *port, *ep;
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int ret = -EINVAL;
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/* input is port 0 */
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port = of_graph_get_port_by_id(node, 0);
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if (!port)
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return -EINVAL;
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/* try finding an upstream endpoint */
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for_each_available_child_of_node(port, ep) {
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struct device_node *remote;
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u32 reg;
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remote = of_graph_get_remote_endpoint(ep);
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if (!remote)
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continue;
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ret = of_property_read_u32(remote, "reg", ®);
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if (ret)
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continue;
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ret = reg;
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}
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of_node_put(port);
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return ret;
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}
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static const struct sunxi_engine_ops sun4i_backend_engine_ops = {
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.commit = sun4i_backend_commit,
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.layers_init = sun4i_layers_init,
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.apply_color_correction = sun4i_backend_apply_color_correction,
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.disable_color_correction = sun4i_backend_disable_color_correction,
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};
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static struct regmap_config sun4i_backend_regmap_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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.max_register = 0x5800,
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};
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static int sun4i_backend_bind(struct device *dev, struct device *master,
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void *data)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct drm_device *drm = data;
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struct sun4i_drv *drv = drm->dev_private;
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struct sun4i_backend *backend;
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const struct sun4i_backend_quirks *quirks;
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struct resource *res;
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void __iomem *regs;
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int i, ret;
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backend = devm_kzalloc(dev, sizeof(*backend), GFP_KERNEL);
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if (!backend)
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return -ENOMEM;
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dev_set_drvdata(dev, backend);
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backend->engine.node = dev->of_node;
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backend->engine.ops = &sun4i_backend_engine_ops;
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backend->engine.id = sun4i_backend_of_get_id(dev->of_node);
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if (backend->engine.id < 0)
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return backend->engine.id;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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regs = devm_ioremap_resource(dev, res);
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if (IS_ERR(regs))
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return PTR_ERR(regs);
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backend->reset = devm_reset_control_get(dev, NULL);
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if (IS_ERR(backend->reset)) {
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dev_err(dev, "Couldn't get our reset line\n");
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return PTR_ERR(backend->reset);
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}
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ret = reset_control_deassert(backend->reset);
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if (ret) {
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dev_err(dev, "Couldn't deassert our reset line\n");
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return ret;
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}
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backend->bus_clk = devm_clk_get(dev, "ahb");
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if (IS_ERR(backend->bus_clk)) {
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dev_err(dev, "Couldn't get the backend bus clock\n");
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ret = PTR_ERR(backend->bus_clk);
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goto err_assert_reset;
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}
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clk_prepare_enable(backend->bus_clk);
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backend->mod_clk = devm_clk_get(dev, "mod");
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if (IS_ERR(backend->mod_clk)) {
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dev_err(dev, "Couldn't get the backend module clock\n");
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ret = PTR_ERR(backend->mod_clk);
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goto err_disable_bus_clk;
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}
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clk_prepare_enable(backend->mod_clk);
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backend->ram_clk = devm_clk_get(dev, "ram");
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if (IS_ERR(backend->ram_clk)) {
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dev_err(dev, "Couldn't get the backend RAM clock\n");
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ret = PTR_ERR(backend->ram_clk);
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goto err_disable_mod_clk;
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}
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clk_prepare_enable(backend->ram_clk);
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if (of_device_is_compatible(dev->of_node,
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"allwinner,sun8i-a33-display-backend")) {
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ret = sun4i_backend_init_sat(dev);
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if (ret) {
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dev_err(dev, "Couldn't init SAT resources\n");
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goto err_disable_ram_clk;
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}
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}
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backend->engine.regs = devm_regmap_init_mmio(dev, regs,
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&sun4i_backend_regmap_config);
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if (IS_ERR(backend->engine.regs)) {
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dev_err(dev, "Couldn't create the backend regmap\n");
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return PTR_ERR(backend->engine.regs);
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}
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list_add_tail(&backend->engine.list, &drv->engine_list);
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/*
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* Many of the backend's layer configuration registers have
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* undefined default values. This poses a risk as we use
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* regmap_update_bits in some places, and don't overwrite
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* the whole register.
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*
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* Clear the registers here to have something predictable.
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*/
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for (i = 0x800; i < 0x1000; i += 4)
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regmap_write(backend->engine.regs, i, 0);
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/* Disable registers autoloading */
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regmap_write(backend->engine.regs, SUN4I_BACKEND_REGBUFFCTL_REG,
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SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS);
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/* Enable the backend */
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regmap_write(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
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SUN4I_BACKEND_MODCTL_DEBE_EN |
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SUN4I_BACKEND_MODCTL_START_CTL);
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/* Set output selection if needed */
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quirks = of_device_get_match_data(dev);
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if (quirks->needs_output_muxing) {
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/*
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* We assume there is no dynamic muxing of backends
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* and TCONs, so we select the backend with same ID.
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*
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* While dynamic selection might be interesting, since
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* the CRTC is tied to the TCON, while the layers are
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* tied to the backends, this means, we will need to
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* switch between groups of layers. There might not be
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* a way to represent this constraint in DRM.
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*/
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regmap_update_bits(backend->engine.regs,
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SUN4I_BACKEND_MODCTL_REG,
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SUN4I_BACKEND_MODCTL_OUT_SEL,
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(backend->engine.id
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? SUN4I_BACKEND_MODCTL_OUT_LCD1
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: SUN4I_BACKEND_MODCTL_OUT_LCD0));
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}
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return 0;
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err_disable_ram_clk:
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clk_disable_unprepare(backend->ram_clk);
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err_disable_mod_clk:
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clk_disable_unprepare(backend->mod_clk);
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err_disable_bus_clk:
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clk_disable_unprepare(backend->bus_clk);
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err_assert_reset:
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reset_control_assert(backend->reset);
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return ret;
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}
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static void sun4i_backend_unbind(struct device *dev, struct device *master,
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void *data)
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{
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struct sun4i_backend *backend = dev_get_drvdata(dev);
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list_del(&backend->engine.list);
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if (of_device_is_compatible(dev->of_node,
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"allwinner,sun8i-a33-display-backend"))
|
|
sun4i_backend_free_sat(dev);
|
|
|
|
clk_disable_unprepare(backend->ram_clk);
|
|
clk_disable_unprepare(backend->mod_clk);
|
|
clk_disable_unprepare(backend->bus_clk);
|
|
reset_control_assert(backend->reset);
|
|
}
|
|
|
|
static const struct component_ops sun4i_backend_ops = {
|
|
.bind = sun4i_backend_bind,
|
|
.unbind = sun4i_backend_unbind,
|
|
};
|
|
|
|
static int sun4i_backend_probe(struct platform_device *pdev)
|
|
{
|
|
return component_add(&pdev->dev, &sun4i_backend_ops);
|
|
}
|
|
|
|
static int sun4i_backend_remove(struct platform_device *pdev)
|
|
{
|
|
component_del(&pdev->dev, &sun4i_backend_ops);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct sun4i_backend_quirks sun5i_backend_quirks = {
|
|
};
|
|
|
|
static const struct sun4i_backend_quirks sun6i_backend_quirks = {
|
|
};
|
|
|
|
static const struct sun4i_backend_quirks sun8i_a33_backend_quirks = {
|
|
};
|
|
|
|
static const struct of_device_id sun4i_backend_of_table[] = {
|
|
{
|
|
.compatible = "allwinner,sun5i-a13-display-backend",
|
|
.data = &sun5i_backend_quirks,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun6i-a31-display-backend",
|
|
.data = &sun6i_backend_quirks,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun8i-a33-display-backend",
|
|
.data = &sun8i_a33_backend_quirks,
|
|
},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sun4i_backend_of_table);
|
|
|
|
static struct platform_driver sun4i_backend_platform_driver = {
|
|
.probe = sun4i_backend_probe,
|
|
.remove = sun4i_backend_remove,
|
|
.driver = {
|
|
.name = "sun4i-backend",
|
|
.of_match_table = sun4i_backend_of_table,
|
|
},
|
|
};
|
|
module_platform_driver(sun4i_backend_platform_driver);
|
|
|
|
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
|
|
MODULE_DESCRIPTION("Allwinner A10 Display Backend Driver");
|
|
MODULE_LICENSE("GPL");
|