Create a simple fbdev device during SimpleDRM setup so legacy user-space and fbcon can use it.
Signed-off-by: David Herrmann dh.herrmann@gmail.com --- drivers/gpu/drm/simpledrm/Kconfig | 11 +++ drivers/gpu/drm/simpledrm/Makefile | 1 + drivers/gpu/drm/simpledrm/simpledrm.c | 13 ++- drivers/gpu/drm/simpledrm/simpledrm.h | 22 +++++ drivers/gpu/drm/simpledrm/simpledrm_fbdev.c | 148 ++++++++++++++++++++++++++++ 5 files changed, 194 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/simpledrm/simpledrm_fbdev.c
diff --git a/drivers/gpu/drm/simpledrm/Kconfig b/drivers/gpu/drm/simpledrm/Kconfig index 35bcce8..eef2a36 100644 --- a/drivers/gpu/drm/simpledrm/Kconfig +++ b/drivers/gpu/drm/simpledrm/Kconfig @@ -12,7 +12,18 @@ config DRM_SIMPLEDRM SimpleDRM supports "simple-framebuffer" DeviceTree objects and compatible platform framebuffers.
+ If fbdev support is enabled, this driver will also provide an fbdev + compatibility layer. + If unsure, say Y.
To compile this driver as a module, choose M here: the module will be called simpledrm. + +config DRM_SIMPLEDRM_FBDEV + bool + depends on DRM_SIMPLEDRM && FB + default y + select FB_CFB_FILLRECT + select FB_CFB_COPYAREA + select FB_CFB_IMAGEBLIT diff --git a/drivers/gpu/drm/simpledrm/Makefile b/drivers/gpu/drm/simpledrm/Makefile index 35f73ea..363b17d 100644 --- a/drivers/gpu/drm/simpledrm/Makefile +++ b/drivers/gpu/drm/simpledrm/Makefile @@ -1,3 +1,4 @@ sdrm-y := simpledrm.o simpledrm_kms.o simpledrm_gem.o simpledrm_damage.o +sdrm-$(CONFIG_DRM_SIMPLEDRM_FBDEV) += simpledrm_fbdev.o
obj-$(CONFIG_DRM_SIMPLEDRM) := sdrm.o diff --git a/drivers/gpu/drm/simpledrm/simpledrm.c b/drivers/gpu/drm/simpledrm/simpledrm.c index 98273f5..4346bcd 100644 --- a/drivers/gpu/drm/simpledrm/simpledrm.c +++ b/drivers/gpu/drm/simpledrm/simpledrm.c @@ -192,7 +192,17 @@ void sdrm_pdev_destroy(struct sdrm_device *sdrm)
static int sdrm_simplefb_probe(struct platform_device *pdev) { - return drm_platform_init(&sdrm_drm_driver, pdev); + struct drm_device *ddev; + int r; + + r = drm_platform_init(&sdrm_drm_driver, pdev); + if (r < 0) + return r; + + ddev = platform_get_drvdata(pdev); + sdrm_fbdev_init(ddev->dev_private); + + return 0; }
static int sdrm_simplefb_remove(struct platform_device *pdev) @@ -205,6 +215,7 @@ static int sdrm_simplefb_remove(struct platform_device *pdev) * CPU is currently doing some GEM-bo access in parallel to us. But, eh, * what can we do.. Fixes for that is being worked on. */
+ sdrm_fbdev_cleanup(sdrm); drm_connector_unplug_all(ddev);
/* protect fb_map removal against sdrm_blit() */ diff --git a/drivers/gpu/drm/simpledrm/simpledrm.h b/drivers/gpu/drm/simpledrm/simpledrm.h index 4ece7f5..7050594 100644 --- a/drivers/gpu/drm/simpledrm/simpledrm.h +++ b/drivers/gpu/drm/simpledrm/simpledrm.h @@ -45,6 +45,9 @@ struct sdrm_device { struct drm_encoder enc; struct drm_connector conn; struct drm_display_mode *mode; + + /* fbdev */ + struct fb_info *fbdev; };
int sdrm_drm_load(struct drm_device *ddev, unsigned long flags); @@ -97,4 +100,23 @@ struct sdrm_framebuffer {
#define to_sdrm_fb(x) container_of(x, struct sdrm_framebuffer, base)
+/* simpledrm fbdev helpers */ + +#ifdef CONFIG_DRM_SIMPLEDRM_FBDEV + +void sdrm_fbdev_init(struct sdrm_device *sdrm); +void sdrm_fbdev_cleanup(struct sdrm_device *sdrm); + +#else /* CONFIG_DRM_SIMPLEDRM_FBDEV */ + +static inline void sdrm_fbdev_init(struct sdrm_device *sdrm) +{ +} + +static inline void sdrm_fbdev_cleanup(struct sdrm_device *sdrm) +{ +} + +#endif /* CONFIG_DRM_SIMPLEDRM_FBDEV */ + #endif /* SDRM_DRV_H */ diff --git a/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c b/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c new file mode 100644 index 0000000..5df1482 --- /dev/null +++ b/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c @@ -0,0 +1,148 @@ +/* + * SimpleDRM firmware framebuffer driver + * Copyright (c) 2012-2014 David Herrmann dh.herrmann@gmail.com + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + */ + +/* + * fbdev compatibility layer + * We provide a basic fbdev device for the same framebuffer that is used for + * the pseudo CRTC. + */ + +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/fb.h> +#include "simpledrm.h" + +struct sdrm_fbdev { + u32 palette[16]; +}; + +static int sdrm_fbdev_setcolreg(u_int regno, u_int red, u_int green, + u_int blue, u_int transp, struct fb_info *info) +{ + u32 *pal = info->pseudo_palette; + u32 cr = red >> (16 - info->var.red.length); + u32 cg = green >> (16 - info->var.green.length); + u32 cb = blue >> (16 - info->var.blue.length); + u32 value; + + if (regno >= 16) + return -EINVAL; + + value = (cr << info->var.red.offset) | + (cg << info->var.green.offset) | + (cb << info->var.blue.offset); + + if (info->var.transp.length > 0) { + u32 mask = (1 << info->var.transp.length) - 1; + mask <<= info->var.transp.offset; + value |= mask; + } + + pal[regno] = value; + + return 0; +} + +static struct fb_ops sdrm_fbdev_ops = { + .owner = THIS_MODULE, + .fb_setcolreg = sdrm_fbdev_setcolreg, + .fb_fillrect = cfb_fillrect, + .fb_copyarea = cfb_copyarea, + .fb_imageblit = cfb_imageblit, +}; + +void sdrm_fbdev_init(struct sdrm_device *sdrm) +{ + struct sdrm_fbdev *fb; + struct fb_info *info; + int ret; + + if (fb_get_options("simpledrmfb", NULL)) + return; + + info = framebuffer_alloc(sizeof(struct sdrm_fbdev), sdrm->ddev->dev); + if (!info) + goto err_out; + + fb = info->par; + info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE; + info->pseudo_palette = fb->palette; + info->fbops = &sdrm_fbdev_ops; + info->screen_base = sdrm->fb_map; + + strncpy(info->fix.id, "simpledrmfb", 15); + info->fix.type = FB_TYPE_PACKED_PIXELS; + info->fix.visual = FB_VISUAL_TRUECOLOR; + info->fix.accel = FB_ACCEL_NONE; + info->fix.smem_start = (unsigned long)sdrm->fb_base; + info->fix.smem_len = sdrm->fb_size; + info->fix.line_length = sdrm->fb_stride; + + info->var.activate = FB_ACTIVATE_NOW; + info->var.vmode = FB_VMODE_NONINTERLACED; + info->var.bits_per_pixel = sdrm->fb_bpp; + info->var.height = -1; + info->var.width = -1; + info->var.xres = sdrm->fb_width; + info->var.yres = sdrm->fb_height; + info->var.xres_virtual = info->var.xres; + info->var.yres_virtual = info->var.yres; + info->var.red = sdrm->fb_sformat->red; + info->var.green = sdrm->fb_sformat->green; + info->var.blue = sdrm->fb_sformat->blue; + info->var.transp = sdrm->fb_sformat->transp; + + /* some dummy values for timing to make fbset happy */ + info->var.pixclock = 10000000 / info->var.xres * 1000 / info->var.yres; + info->var.left_margin = (info->var.xres / 8) & 0xf8; + info->var.right_margin = 32; + info->var.upper_margin = 16; + info->var.lower_margin = 4; + info->var.hsync_len = (info->var.xres / 8) & 0xf8; + info->var.vsync_len = 4; + + sdrm->fbdev = info; + ret = register_framebuffer(info); + if (ret < 0) + goto err_free; + + dev_info(sdrm->ddev->dev, "fbdev frontend %s as fb%d\n", + info->fix.id, info->node); + + return; + +err_free: + framebuffer_release(info); + sdrm->fbdev = NULL; +err_out: + dev_warn(sdrm->ddev->dev, "cannot create fbdev frontend\n"); +} + +void sdrm_fbdev_cleanup(struct sdrm_device *sdrm) +{ + struct fb_info *info; + + if (!sdrm->fbdev) + return; + + info = sdrm->fbdev; + sdrm->fbdev = NULL; + + dev_info(sdrm->ddev->dev, "remove fbdev frontend %s (fb%d)\n", + info->fix.id, info->node); + + if (unregister_framebuffer(info)) + dev_err(sdrm->ddev->dev, "unregister_framebuffer() failed, leaking fw-fb\n"); + else + framebuffer_release(info); +}