From 180af60db3526e997b4363925a6c181c21c00bbb Mon Sep 17 00:00:00 2001 From: James Hughes Date: Thu, 14 Mar 2019 13:27:54 +0000 Subject: [PATCH 631/773] Pulled in the multi frame buffer support from the Pi3 repo --- drivers/video/fbdev/bcm2708_fb.c | 580 +++++++++++++++------ include/soc/bcm2835/raspberrypi-firmware.h | 4 + 2 files changed, 432 insertions(+), 152 deletions(-) --- a/drivers/video/fbdev/bcm2708_fb.c +++ b/drivers/video/fbdev/bcm2708_fb.c @@ -2,6 +2,7 @@ * linux/drivers/video/bcm2708_fb.c * * Copyright (C) 2010 Broadcom + * Copyright (C) 2018 Raspberry Pi (Trading) Ltd * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive @@ -13,6 +14,7 @@ * Copyright 1999-2001 Jeff Garzik * */ + #include #include #include @@ -36,6 +38,7 @@ #include #include #include +#include //#define BCM2708_FB_DEBUG #define MODULE_NAME "bcm2708_fb" @@ -82,62 +85,139 @@ struct bcm2708_fb_stats { u32 dma_irqs; }; +struct vc4_display_settings_t { + u32 display_num; + u32 width; + u32 height; + u32 pitch; + u32 depth; + u32 virtual_width; + u32 virtual_height; + u32 virtual_width_offset; + u32 virtual_height_offset; + unsigned long fb_bus_address; +}; + +struct bcm2708_fb_dev; + struct bcm2708_fb { struct fb_info fb; struct platform_device *dev; - struct rpi_firmware *fw; u32 cmap[16]; u32 gpu_cmap[256]; + struct dentry *debugfs_dir; + struct dentry *debugfs_subdir; + unsigned long fb_bus_address; + struct { u32 base, length; } gpu; + struct vc4_display_settings_t display_settings; + struct debugfs_regset32 screeninfo_regset; + struct bcm2708_fb_dev *fbdev; + unsigned int image_size; + dma_addr_t dma_addr; + void *cpuaddr; +}; + +#define MAX_FRAMEBUFFERS 3 + +struct bcm2708_fb_dev { + int firmware_supports_multifb; + /* Protects the DMA system from multiple FB access */ + struct mutex dma_mutex; int dma_chan; int dma_irq; void __iomem *dma_chan_base; - void *cb_base; /* DMA control blocks */ - dma_addr_t cb_handle; - struct dentry *debugfs_dir; wait_queue_head_t dma_waitq; - struct bcm2708_fb_stats stats; - unsigned long fb_bus_address; - struct { u32 base, length; } gpu; + bool disable_arm_alloc; + struct bcm2708_fb_stats dma_stats; + void *cb_base; /* DMA control blocks */ + dma_addr_t cb_handle; + int instance_count; + int num_displays; + struct rpi_firmware *fw; + struct bcm2708_fb displays[MAX_FRAMEBUFFERS]; }; #define to_bcm2708(info) container_of(info, struct bcm2708_fb, fb) static void bcm2708_fb_debugfs_deinit(struct bcm2708_fb *fb) { - debugfs_remove_recursive(fb->debugfs_dir); - fb->debugfs_dir = NULL; + debugfs_remove_recursive(fb->debugfs_subdir); + fb->debugfs_subdir = NULL; + + fb->fbdev->instance_count--; + + if (!fb->fbdev->instance_count) { + debugfs_remove_recursive(fb->debugfs_dir); + fb->debugfs_dir = NULL; + } } static int bcm2708_fb_debugfs_init(struct bcm2708_fb *fb) { + char buf[3]; + struct bcm2708_fb_dev *fbdev = fb->fbdev; + static struct debugfs_reg32 stats_registers[] = { - { - "dma_copies", - offsetof(struct bcm2708_fb_stats, dma_copies) - }, - { - "dma_irqs", - offsetof(struct bcm2708_fb_stats, dma_irqs) - }, + {"dma_copies", offsetof(struct bcm2708_fb_stats, dma_copies)}, + {"dma_irqs", offsetof(struct bcm2708_fb_stats, dma_irqs)}, }; - fb->debugfs_dir = debugfs_create_dir(DRIVER_NAME, NULL); + static struct debugfs_reg32 screeninfo[] = { + {"width", offsetof(struct fb_var_screeninfo, xres)}, + {"height", offsetof(struct fb_var_screeninfo, yres)}, + {"bpp", offsetof(struct fb_var_screeninfo, bits_per_pixel)}, + {"xres_virtual", offsetof(struct fb_var_screeninfo, xres_virtual)}, + {"yres_virtual", offsetof(struct fb_var_screeninfo, yres_virtual)}, + {"xoffset", offsetof(struct fb_var_screeninfo, xoffset)}, + {"yoffset", offsetof(struct fb_var_screeninfo, yoffset)}, + }; + + fb->debugfs_dir = debugfs_lookup(DRIVER_NAME, NULL); + + if (!fb->debugfs_dir) + fb->debugfs_dir = debugfs_create_dir(DRIVER_NAME, NULL); + if (!fb->debugfs_dir) { - pr_warn("%s: could not create debugfs entry\n", - __func__); + dev_warn(fb->fb.dev, "%s: could not create debugfs folder\n", + __func__); + return -EFAULT; + } + + snprintf(buf, sizeof(buf), "%u", fb->display_settings.display_num); + + fb->debugfs_subdir = debugfs_create_dir(buf, fb->debugfs_dir); + + if (!fb->debugfs_subdir) { + dev_warn(fb->fb.dev, "%s: could not create debugfs entry %u\n", + __func__, fb->display_settings.display_num); return -EFAULT; } - fb->stats.regset.regs = stats_registers; - fb->stats.regset.nregs = ARRAY_SIZE(stats_registers); - fb->stats.regset.base = &fb->stats; - - if (!debugfs_create_regset32("stats", 0444, fb->debugfs_dir, - &fb->stats.regset)) { - pr_warn("%s: could not create statistics registers\n", - __func__); + fbdev->dma_stats.regset.regs = stats_registers; + fbdev->dma_stats.regset.nregs = ARRAY_SIZE(stats_registers); + fbdev->dma_stats.regset.base = &fbdev->dma_stats; + + if (!debugfs_create_regset32("dma_stats", 0444, fb->debugfs_subdir, + &fbdev->dma_stats.regset)) { + dev_warn(fb->fb.dev, "%s: could not create statistics registers\n", + __func__); + goto fail; + } + + fb->screeninfo_regset.regs = screeninfo; + fb->screeninfo_regset.nregs = ARRAY_SIZE(screeninfo); + fb->screeninfo_regset.base = &fb->fb.var; + + if (!debugfs_create_regset32("screeninfo", 0444, fb->debugfs_subdir, + &fb->screeninfo_regset)) { + dev_warn(fb->fb.dev, + "%s: could not create dimensions registers\n", + __func__); goto fail; } + + fbdev->instance_count++; + return 0; fail: @@ -145,6 +225,20 @@ fail: return -EFAULT; } +static void set_display_num(struct bcm2708_fb *fb) +{ + if (fb && fb->fbdev && fb->fbdev->firmware_supports_multifb) { + u32 tmp = fb->display_settings.display_num; + + if (rpi_firmware_property(fb->fbdev->fw, + RPI_FIRMWARE_FRAMEBUFFER_SET_DISPLAY_NUM, + &tmp, + sizeof(tmp))) + dev_warn_once(fb->fb.dev, + "Set display number call failed. Old GPU firmware?"); + } +} + static int bcm2708_fb_set_bitfields(struct fb_var_screeninfo *var) { int ret = 0; @@ -222,11 +316,11 @@ static int bcm2708_fb_check_var(struct f struct fb_info *info) { /* info input, var output */ - print_debug("%s(%p) %dx%d (%dx%d), %d, %d\n", + print_debug("%s(%p) %ux%u (%ux%u), %ul, %u\n", __func__, info, info->var.xres, info->var.yres, info->var.xres_virtual, info->var.yres_virtual, - (int)info->screen_size, info->var.bits_per_pixel); - print_debug("%s(%p) %dx%d (%dx%d), %d\n", __func__, var, var->xres, + info->screen_size, info->var.bits_per_pixel); + print_debug("%s(%p) %ux%u (%ux%u), %u\n", __func__, var, var->xres, var->yres, var->xres_virtual, var->yres_virtual, var->bits_per_pixel); @@ -283,23 +377,96 @@ static int bcm2708_fb_set_par(struct fb_ .xoffset = info->var.xoffset, .yoffset = info->var.yoffset, .tag5 = { RPI_FIRMWARE_FRAMEBUFFER_ALLOCATE, 8, 0 }, - .base = 0, - .screen_size = 0, - .tag6 = { RPI_FIRMWARE_FRAMEBUFFER_GET_PITCH, 4, 0 }, - .pitch = 0, + /* base and screen_size will be initialised later */ + .tag6 = { RPI_FIRMWARE_FRAMEBUFFER_SET_PITCH, 4, 0 }, + /* pitch will be initialised later */ }; - int ret; + int ret, image_size; + - print_debug("%s(%p) %dx%d (%dx%d), %d, %d\n", __func__, info, + print_debug("%s(%p) %dx%d (%dx%d), %d, %d (display %d)\n", __func__, + info, info->var.xres, info->var.yres, info->var.xres_virtual, info->var.yres_virtual, (int)info->screen_size, - info->var.bits_per_pixel); + info->var.bits_per_pixel, value); + + /* Need to set the display number to act on first + * Cannot do it in the tag list because on older firmware the call + * will fail and stop the rest of the list being executed. + * We can ignore this call failing as the default at other end is 0 + */ + set_display_num(fb); + + /* Try allocating our own buffer. We can specify all the parameters */ + image_size = ((info->var.xres * info->var.yres) * + info->var.bits_per_pixel) >> 3; + + if (!fb->fbdev->disable_arm_alloc && + (image_size != fb->image_size || !fb->dma_addr)) { + if (fb->dma_addr) { + dma_free_coherent(info->device, fb->image_size, + fb->cpuaddr, fb->dma_addr); + fb->image_size = 0; + fb->cpuaddr = NULL; + fb->dma_addr = 0; + } + + fb->cpuaddr = dma_alloc_coherent(info->device, image_size, + &fb->dma_addr, GFP_KERNEL); + + if (!fb->cpuaddr) { + fb->dma_addr = 0; + fb->fbdev->disable_arm_alloc = true; + } else { + fb->image_size = image_size; + } + } + + if (fb->cpuaddr) { + fbinfo.base = fb->dma_addr; + fbinfo.screen_size = image_size; + fbinfo.pitch = (info->var.xres * info->var.bits_per_pixel) >> 3; + + ret = rpi_firmware_property_list(fb->fbdev->fw, &fbinfo, + sizeof(fbinfo)); + if (ret || fbinfo.base != fb->dma_addr) { + /* Firmware either failed, or assigned a different base + * address (ie it doesn't support being passed an FB + * allocation). + * Destroy the allocation, and don't try again. + */ + dma_free_coherent(info->device, fb->image_size, + fb->cpuaddr, fb->dma_addr); + fb->image_size = 0; + fb->cpuaddr = NULL; + fb->dma_addr = 0; + fb->fbdev->disable_arm_alloc = true; + } + } else { + /* Our allocation failed - drop into the old scheme of + * allocation by the VPU. + */ + ret = -ENOMEM; + } - ret = rpi_firmware_property_list(fb->fw, &fbinfo, sizeof(fbinfo)); if (ret) { - dev_err(info->device, - "Failed to allocate GPU framebuffer (%d)\n", ret); - return ret; + /* Old scheme: + * - FRAMEBUFFER_ALLOCATE passes 0 for base and screen_size. + * - GET_PITCH instead of SET_PITCH. + */ + fbinfo.base = 0; + fbinfo.screen_size = 0; + fbinfo.tag6.tag = RPI_FIRMWARE_FRAMEBUFFER_GET_PITCH; + fbinfo.pitch = 0; + + ret = rpi_firmware_property_list(fb->fbdev->fw, &fbinfo, + sizeof(fbinfo)); + if (ret) { + dev_err(info->device, + "Failed to allocate GPU framebuffer (%d)\n", + ret); + return ret; + } } if (info->var.bits_per_pixel <= 8) @@ -314,9 +481,17 @@ static int bcm2708_fb_set_par(struct fb_ fb->fb.fix.smem_start = fbinfo.base; fb->fb.fix.smem_len = fbinfo.pitch * fbinfo.yres_virtual; fb->fb.screen_size = fbinfo.screen_size; - if (fb->fb.screen_base) - iounmap(fb->fb.screen_base); - fb->fb.screen_base = ioremap_wc(fbinfo.base, fb->fb.screen_size); + + if (!fb->dma_addr) { + if (fb->fb.screen_base) + iounmap(fb->fb.screen_base); + + fb->fb.screen_base = ioremap_wc(fbinfo.base, + fb->fb.screen_size); + } else { + fb->fb.screen_base = fb->cpuaddr; + } + if (!fb->fb.screen_base) { /* the console may currently be locked */ console_trylock(); @@ -374,7 +549,10 @@ static int bcm2708_fb_setcolreg(unsigned packet->length = regno + 1; memcpy(packet->cmap, fb->gpu_cmap, sizeof(packet->cmap)); - ret = rpi_firmware_property(fb->fw, + + set_display_num(fb); + + ret = rpi_firmware_property(fb->fbdev->fw, RPI_FIRMWARE_FRAMEBUFFER_SET_PALETTE, packet, (2 + packet->length) * sizeof(u32)); @@ -413,8 +591,11 @@ static int bcm2708_fb_blank(int blank_mo return -EINVAL; } - ret = rpi_firmware_property(fb->fw, RPI_FIRMWARE_FRAMEBUFFER_BLANK, + set_display_num(fb); + + ret = rpi_firmware_property(fb->fbdev->fw, RPI_FIRMWARE_FRAMEBUFFER_BLANK, &value, sizeof(value)); + if (ret) dev_err(info->device, "%s(%d) failed: %d\n", __func__, blank_mode, ret); @@ -431,7 +612,7 @@ static int bcm2708_fb_pan_display(struct info->var.yoffset = var->yoffset; result = bcm2708_fb_set_par(info); if (result != 0) - pr_err("%s(%d,%d) returns=%d\n", __func__, var->xoffset, + pr_err("%s(%u,%u) returns=%d\n", __func__, var->xoffset, var->yoffset, result); return result; } @@ -439,8 +620,9 @@ static int bcm2708_fb_pan_display(struct static void dma_memcpy(struct bcm2708_fb *fb, dma_addr_t dst, dma_addr_t src, int size) { - int burst_size = (fb->dma_chan == 0) ? 8 : 2; - struct bcm2708_dma_cb *cb = fb->cb_base; + struct bcm2708_fb_dev *fbdev = fb->fbdev; + struct bcm2708_dma_cb *cb = fbdev->cb_base; + int burst_size = (fbdev->dma_chan == 0) ? 8 : 2; cb->info = BCM2708_DMA_BURST(burst_size) | BCM2708_DMA_S_WIDTH | BCM2708_DMA_S_INC | BCM2708_DMA_D_WIDTH | @@ -453,21 +635,27 @@ static void dma_memcpy(struct bcm2708_fb cb->pad[1] = 0; cb->next = 0; + // Not sure what to do if this gets a signal whilst waiting + if (mutex_lock_interruptible(&fbdev->dma_mutex)) + return; + if (size < dma_busy_wait_threshold) { - bcm_dma_start(fb->dma_chan_base, fb->cb_handle); - bcm_dma_wait_idle(fb->dma_chan_base); + bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle); + bcm_dma_wait_idle(fbdev->dma_chan_base); } else { - void __iomem *dma_chan = fb->dma_chan_base; + void __iomem *local_dma_chan = fbdev->dma_chan_base; cb->info |= BCM2708_DMA_INT_EN; - bcm_dma_start(fb->dma_chan_base, fb->cb_handle); - while (bcm_dma_is_busy(dma_chan)) { - wait_event_interruptible(fb->dma_waitq, - !bcm_dma_is_busy(dma_chan)); + bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle); + while (bcm_dma_is_busy(local_dma_chan)) { + wait_event_interruptible(fbdev->dma_waitq, + !bcm_dma_is_busy(local_dma_chan)); } - fb->stats.dma_irqs++; + fbdev->dma_stats.dma_irqs++; } - fb->stats.dma_copies++; + fbdev->dma_stats.dma_copies++; + + mutex_unlock(&fbdev->dma_mutex); } /* address with no aliases */ @@ -542,10 +730,13 @@ static int bcm2708_ioctl(struct fb_info switch (cmd) { case FBIO_WAITFORVSYNC: - ret = rpi_firmware_property(fb->fw, + set_display_num(fb); + + ret = rpi_firmware_property(fb->fbdev->fw, RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC, &dummy, sizeof(dummy)); break; + case FBIODMACOPY: { struct fb_dmacopy ioparam; @@ -615,23 +806,22 @@ static int bcm2708_compat_ioctl(struct f static void bcm2708_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect) { - /* (is called) print_debug("bcm2708_fb_fillrect\n"); */ cfb_fillrect(info, rect); } /* A helper function for configuring dma control block */ static void set_dma_cb(struct bcm2708_dma_cb *cb, - int burst_size, - dma_addr_t dst, - int dst_stride, - dma_addr_t src, - int src_stride, - int w, - int h) + int burst_size, + dma_addr_t dst, + int dst_stride, + dma_addr_t src, + int src_stride, + int w, + int h) { cb->info = BCM2708_DMA_BURST(burst_size) | BCM2708_DMA_S_WIDTH | - BCM2708_DMA_S_INC | BCM2708_DMA_D_WIDTH | - BCM2708_DMA_D_INC | BCM2708_DMA_TDMODE; + BCM2708_DMA_S_INC | BCM2708_DMA_D_WIDTH | + BCM2708_DMA_D_INC | BCM2708_DMA_TDMODE; cb->dst = dst; cb->src = src; /* @@ -649,15 +839,19 @@ static void bcm2708_fb_copyarea(struct f const struct fb_copyarea *region) { struct bcm2708_fb *fb = to_bcm2708(info); - struct bcm2708_dma_cb *cb = fb->cb_base; + struct bcm2708_fb_dev *fbdev = fb->fbdev; + struct bcm2708_dma_cb *cb = fbdev->cb_base; int bytes_per_pixel = (info->var.bits_per_pixel + 7) >> 3; /* Channel 0 supports larger bursts and is a bit faster */ - int burst_size = (fb->dma_chan == 0) ? 8 : 2; + int burst_size = (fbdev->dma_chan == 0) ? 8 : 2; int pixels = region->width * region->height; - /* Fallback to cfb_copyarea() if we don't like something */ - if (bytes_per_pixel > 4 || + /* If DMA is currently in use (ie being used on another FB), then + * rather than wait for it to finish, just use the cfb_copyarea + */ + if (!mutex_trylock(&fbdev->dma_mutex) || + bytes_per_pixel > 4 || info->var.xres * info->var.yres > 1920 * 1200 || region->width <= 0 || region->width > info->var.xres || region->height <= 0 || region->height > info->var.yres || @@ -684,8 +878,8 @@ static void bcm2708_fb_copyarea(struct f * 1920x1200 resolution at 32bpp pixel depth. */ int y; - dma_addr_t control_block_pa = fb->cb_handle; - dma_addr_t scratchbuf = fb->cb_handle + 16 * 1024; + dma_addr_t control_block_pa = fbdev->cb_handle; + dma_addr_t scratchbuf = fbdev->cb_handle + 16 * 1024; int scanline_size = bytes_per_pixel * region->width; int scanlines_per_cb = (64 * 1024 - 16 * 1024) / scanline_size; @@ -735,10 +929,10 @@ static void bcm2708_fb_copyarea(struct f } set_dma_cb(cb, burst_size, fb->fb_bus_address + dy * fb->fb.fix.line_length + - bytes_per_pixel * region->dx, + bytes_per_pixel * region->dx, stride, fb->fb_bus_address + sy * fb->fb.fix.line_length + - bytes_per_pixel * region->sx, + bytes_per_pixel * region->sx, stride, region->width * bytes_per_pixel, region->height); @@ -748,32 +942,33 @@ static void bcm2708_fb_copyarea(struct f cb->next = 0; if (pixels < dma_busy_wait_threshold) { - bcm_dma_start(fb->dma_chan_base, fb->cb_handle); - bcm_dma_wait_idle(fb->dma_chan_base); + bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle); + bcm_dma_wait_idle(fbdev->dma_chan_base); } else { - void __iomem *dma_chan = fb->dma_chan_base; + void __iomem *local_dma_chan = fbdev->dma_chan_base; cb->info |= BCM2708_DMA_INT_EN; - bcm_dma_start(fb->dma_chan_base, fb->cb_handle); - while (bcm_dma_is_busy(dma_chan)) { - wait_event_interruptible(fb->dma_waitq, - !bcm_dma_is_busy(dma_chan)); + bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle); + while (bcm_dma_is_busy(local_dma_chan)) { + wait_event_interruptible(fbdev->dma_waitq, + !bcm_dma_is_busy(local_dma_chan)); } - fb->stats.dma_irqs++; + fbdev->dma_stats.dma_irqs++; } - fb->stats.dma_copies++; + fbdev->dma_stats.dma_copies++; + + mutex_unlock(&fbdev->dma_mutex); } static void bcm2708_fb_imageblit(struct fb_info *info, const struct fb_image *image) { - /* (is called) print_debug("bcm2708_fb_imageblit\n"); */ cfb_imageblit(info, image); } static irqreturn_t bcm2708_fb_dma_irq(int irq, void *cxt) { - struct bcm2708_fb *fb = cxt; + struct bcm2708_fb_dev *fbdev = cxt; /* FIXME: should read status register to check if this is * actually interrupting us or not, in case this interrupt @@ -783,9 +978,9 @@ static irqreturn_t bcm2708_fb_dma_irq(in */ /* acknowledge the interrupt */ - writel(BCM2708_DMA_INT, fb->dma_chan_base + BCM2708_DMA_CS); + writel(BCM2708_DMA_INT, fbdev->dma_chan_base + BCM2708_DMA_CS); - wake_up(&fb->dma_waitq); + wake_up(&fbdev->dma_waitq); return IRQ_HANDLED; } @@ -821,11 +1016,23 @@ static int bcm2708_fb_register(struct bc fb->fb.fix.ywrapstep = 0; fb->fb.fix.accel = FB_ACCEL_NONE; - fb->fb.var.xres = fbwidth; - fb->fb.var.yres = fbheight; - fb->fb.var.xres_virtual = fbwidth; - fb->fb.var.yres_virtual = fbheight; - fb->fb.var.bits_per_pixel = fbdepth; + /* If we have data from the VC4 on FB's, use that, otherwise use the + * module parameters + */ + if (fb->display_settings.width) { + fb->fb.var.xres = fb->display_settings.width; + fb->fb.var.yres = fb->display_settings.height; + fb->fb.var.xres_virtual = fb->fb.var.xres; + fb->fb.var.yres_virtual = fb->fb.var.yres; + fb->fb.var.bits_per_pixel = fb->display_settings.depth; + } else { + fb->fb.var.xres = fbwidth; + fb->fb.var.yres = fbheight; + fb->fb.var.xres_virtual = fbwidth; + fb->fb.var.yres_virtual = fbheight; + fb->fb.var.bits_per_pixel = fbdepth; + } + fb->fb.var.vmode = FB_VMODE_NONINTERLACED; fb->fb.var.activate = FB_ACTIVATE_NOW; fb->fb.var.nonstd = 0; @@ -841,26 +1048,23 @@ static int bcm2708_fb_register(struct bc fb->fb.monspecs.dclkmax = 100000000; bcm2708_fb_set_bitfields(&fb->fb.var); - init_waitqueue_head(&fb->dma_waitq); /* * Allocate colourmap. */ - fb_set_var(&fb->fb, &fb->fb.var); + ret = bcm2708_fb_set_par(&fb->fb); + if (ret) return ret; - print_debug("BCM2708FB: registering framebuffer (%dx%d@%d) (%d)\n", - fbwidth, fbheight, fbdepth, fbswap); - ret = register_framebuffer(&fb->fb); - print_debug("BCM2708FB: register framebuffer (%d)\n", ret); + if (ret == 0) goto out; - print_debug("BCM2708FB: cannot register framebuffer (%d)\n", ret); + dev_warn(fb->fb.dev, "Unable to register framebuffer (%d)\n", ret); out: return ret; } @@ -869,10 +1073,18 @@ static int bcm2708_fb_probe(struct platf { struct device_node *fw_np; struct rpi_firmware *fw; - struct bcm2708_fb *fb; - int ret; + int ret, i; + u32 num_displays; + struct bcm2708_fb_dev *fbdev; + struct { u32 base, length; } gpu_mem; + + fbdev = devm_kzalloc(&dev->dev, sizeof(*fbdev), GFP_KERNEL); + + if (!fbdev) + return -ENOMEM; fw_np = of_parse_phandle(dev->dev.of_node, "firmware", 0); + /* Remove comment when booting without Device Tree is no longer supported * if (!fw_np) { * dev_err(&dev->dev, "Missing firmware node\n"); @@ -880,90 +1092,154 @@ static int bcm2708_fb_probe(struct platf * } */ fw = rpi_firmware_get(fw_np); + fbdev->fw = fw; + if (!fw) return -EPROBE_DEFER; - fb = kzalloc(sizeof(*fb), GFP_KERNEL); - if (!fb) { - ret = -ENOMEM; - goto free_region; + ret = rpi_firmware_property(fw, + RPI_FIRMWARE_FRAMEBUFFER_GET_NUM_DISPLAYS, + &num_displays, sizeof(u32)); + + /* If we fail to get the number of displays, or it returns 0, then + * assume old firmware that doesn't have the mailbox call, so just + * set one display + */ + if (ret || num_displays == 0) { + num_displays = 1; + dev_err(&dev->dev, + "Unable to determine number of FB's. Assuming 1\n"); + ret = 0; + } else { + fbdev->firmware_supports_multifb = 1; } - fb->fw = fw; - bcm2708_fb_debugfs_init(fb); + if (num_displays > MAX_FRAMEBUFFERS) { + dev_warn(&dev->dev, + "More displays reported from firmware than supported in driver (%u vs %u)", + num_displays, MAX_FRAMEBUFFERS); + num_displays = MAX_FRAMEBUFFERS; + } - fb->cb_base = dma_alloc_writecombine(&dev->dev, SZ_64K, - &fb->cb_handle, GFP_KERNEL); - if (!fb->cb_base) { + dev_info(&dev->dev, "FB found %d display(s)\n", num_displays); + + /* Set up the DMA information. Note we have just one set of DMA + * parameters to work with all the FB's so requires synchronising when + * being used + */ + + mutex_init(&fbdev->dma_mutex); + + fbdev->cb_base = dma_alloc_writecombine(&dev->dev, SZ_64K, + &fbdev->cb_handle, + GFP_KERNEL); + if (!fbdev->cb_base) { dev_err(&dev->dev, "cannot allocate DMA CBs\n"); ret = -ENOMEM; goto free_fb; } - pr_info("BCM2708FB: allocated DMA memory %pad\n", &fb->cb_handle); - ret = bcm_dma_chan_alloc(BCM_DMA_FEATURE_BULK, - &fb->dma_chan_base, &fb->dma_irq); + &fbdev->dma_chan_base, + &fbdev->dma_irq); if (ret < 0) { - dev_err(&dev->dev, "couldn't allocate a DMA channel\n"); + dev_err(&dev->dev, "Couldn't allocate a DMA channel\n"); goto free_cb; } - fb->dma_chan = ret; + fbdev->dma_chan = ret; - ret = request_irq(fb->dma_irq, bcm2708_fb_dma_irq, - 0, "bcm2708_fb dma", fb); + ret = request_irq(fbdev->dma_irq, bcm2708_fb_dma_irq, + 0, "bcm2708_fb DMA", fbdev); if (ret) { - pr_err("%s: failed to request DMA irq\n", __func__); + dev_err(&dev->dev, + "Failed to request DMA irq\n"); goto free_dma_chan; } - pr_info("BCM2708FB: allocated DMA channel %d\n", fb->dma_chan); + rpi_firmware_property(fbdev->fw, + RPI_FIRMWARE_GET_VC_MEMORY, + &gpu_mem, sizeof(gpu_mem)); + + for (i = 0; i < num_displays; i++) { + struct bcm2708_fb *fb = &fbdev->displays[i]; + + fb->display_settings.display_num = i; + fb->dev = dev; + fb->fb.device = &dev->dev; + fb->fbdev = fbdev; + + fb->gpu.base = gpu_mem.base; + fb->gpu.length = gpu_mem.length; + + if (fbdev->firmware_supports_multifb) { + ret = rpi_firmware_property(fw, + RPI_FIRMWARE_FRAMEBUFFER_GET_DISPLAY_SETTINGS, + &fb->display_settings, + GET_DISPLAY_SETTINGS_PAYLOAD_SIZE); + } else { + memset(&fb->display_settings, 0, + sizeof(fb->display_settings)); + } + + ret = bcm2708_fb_register(fb); - fb->dev = dev; - fb->fb.device = &dev->dev; + if (ret == 0) { + bcm2708_fb_debugfs_init(fb); - /* failure here isn't fatal, but we'll fail in vc_mem_copy if - * fb->gpu is not valid - */ - rpi_firmware_property(fb->fw, RPI_FIRMWARE_GET_VC_MEMORY, &fb->gpu, - sizeof(fb->gpu)); + fbdev->num_displays++; - ret = bcm2708_fb_register(fb); - if (ret == 0) { - platform_set_drvdata(dev, fb); - goto out; + dev_info(&dev->dev, + "Registered framebuffer for display %u, size %ux%u\n", + fb->display_settings.display_num, + fb->fb.var.xres, + fb->fb.var.yres); + } else { + // Use this to flag if this FB entry is in use. + fb->fbdev = NULL; + } + } + + // Did we actually successfully create any FB's? + if (fbdev->num_displays) { + init_waitqueue_head(&fbdev->dma_waitq); + platform_set_drvdata(dev, fbdev); + return ret; } free_dma_chan: - bcm_dma_chan_free(fb->dma_chan); + bcm_dma_chan_free(fbdev->dma_chan); free_cb: - dma_free_writecombine(&dev->dev, SZ_64K, fb->cb_base, fb->cb_handle); + dma_free_writecombine(&dev->dev, SZ_64K, fbdev->cb_base, + fbdev->cb_handle); free_fb: - kfree(fb); -free_region: dev_err(&dev->dev, "probe failed, err %d\n", ret); -out: + return ret; } static int bcm2708_fb_remove(struct platform_device *dev) { - struct bcm2708_fb *fb = platform_get_drvdata(dev); + struct bcm2708_fb_dev *fbdev = platform_get_drvdata(dev); + int i; platform_set_drvdata(dev, NULL); - if (fb->fb.screen_base) - iounmap(fb->fb.screen_base); - unregister_framebuffer(&fb->fb); - - dma_free_writecombine(&dev->dev, SZ_64K, fb->cb_base, fb->cb_handle); - bcm_dma_chan_free(fb->dma_chan); - - bcm2708_fb_debugfs_deinit(fb); + for (i = 0; i < fbdev->num_displays; i++) { + if (fbdev->displays[i].fb.screen_base) + iounmap(fbdev->displays[i].fb.screen_base); + + if (fbdev->displays[i].fbdev) { + unregister_framebuffer(&fbdev->displays[i].fb); + bcm2708_fb_debugfs_deinit(&fbdev->displays[i]); + } + } - free_irq(fb->dma_irq, fb); + dma_free_writecombine(&dev->dev, SZ_64K, fbdev->cb_base, + fbdev->cb_handle); + bcm_dma_chan_free(fbdev->dma_chan); + free_irq(fbdev->dma_irq, fbdev); - kfree(fb); + mutex_destroy(&fbdev->dma_mutex); return 0; } @@ -978,10 +1254,10 @@ static struct platform_driver bcm2708_fb .probe = bcm2708_fb_probe, .remove = bcm2708_fb_remove, .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - .of_match_table = bcm2708_fb_of_match_table, - }, + .name = DRIVER_NAME, + .owner = THIS_MODULE, + .of_match_table = bcm2708_fb_of_match_table, + }, }; static int __init bcm2708_fb_init(void) --- a/include/soc/bcm2835/raspberrypi-firmware.h +++ b/include/soc/bcm2835/raspberrypi-firmware.h @@ -138,9 +138,11 @@ enum rpi_firmware_property_tag { RPI_FIRMWARE_FRAMEBUFFER_SET_DEPTH = 0x00048005, RPI_FIRMWARE_FRAMEBUFFER_SET_PIXEL_ORDER = 0x00048006, RPI_FIRMWARE_FRAMEBUFFER_SET_ALPHA_MODE = 0x00048007, + RPI_FIRMWARE_FRAMEBUFFER_SET_PITCH = 0x00048008, RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_OFFSET = 0x00048009, RPI_FIRMWARE_FRAMEBUFFER_SET_OVERSCAN = 0x0004800a, RPI_FIRMWARE_FRAMEBUFFER_SET_PALETTE = 0x0004800b, + RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF = 0x0004801f, RPI_FIRMWARE_FRAMEBUFFER_SET_GPIOVIRTBUF = 0x00048020, RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC = 0x0004800e, @@ -159,6 +161,8 @@ enum rpi_firmware_property_tag { RPI_FIRMWARE_GET_DMA_CHANNELS = 0x00060001, }; +#define GET_DISPLAY_SETTINGS_PAYLOAD_SIZE 64 + #if IS_ENABLED(CONFIG_RASPBERRYPI_FIRMWARE) int rpi_firmware_property(struct rpi_firmware *fw, u32 tag, void *data, size_t len);