From patchwork Thu Jul 28 14:28:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markuss Broks X-Patchwork-Id: 594774 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EADB6C25B07 for ; Thu, 28 Jul 2022 14:28:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231845AbiG1O24 (ORCPT ); Thu, 28 Jul 2022 10:28:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56706 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231807AbiG1O2y (ORCPT ); Thu, 28 Jul 2022 10:28:54 -0400 Received: from mail-ej1-x62d.google.com (mail-ej1-x62d.google.com [IPv6:2a00:1450:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F12C565D66; Thu, 28 Jul 2022 07:28:52 -0700 (PDT) Received: by mail-ej1-x62d.google.com with SMTP id j22so3491429ejs.2; Thu, 28 Jul 2022 07:28:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=+qxi1BsKPmynG3xfpNZLp6J5s/IWJprPFoEGd6KJx1s=; b=Dqobgjs1nII8eXteQLjz2ED1bVraj/SM6DyKm259IZRg1sN9fXwxKHIjnG2b0D3INP CJtDIdhUiiT3FrZ8VGIV5YyCY/B5CS56vg2LrtG2qoKAVoBPg5C5Rc4irrfAhqzUR8Gh +kybMZBZKngEWg1dyX5m4BVx0V2laC+H53UD1uGBiO18QUV/cjUgIsNB5O4VSdrtTV9W Cjr63Q11WQXEj+bfEst6CJpV6b6nywbFMPcaGL39fGMjwTeOGbNRQn9EtmKqq7ZN4xwN pF26gzooknPqRasWoevZQAJ4FehkqRleQDodSdYOcvnJ8YGzspu/VUm+wAjSwHvBT353 9FoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=+qxi1BsKPmynG3xfpNZLp6J5s/IWJprPFoEGd6KJx1s=; b=HBiH159v6FP5hmFNEK1MbJWvrDYIqVclT5Dl+AOO0iKd0yHrkxHnbsO58UF3dO770+ hEF952flatyyhaMQX7pTelv6SWMFjW4K5pNdiwlOLxNqGzDT97hVFYlyapWCorZpMtWB 0uy1lu/vysX5fUd+pQ312MxgwSDyR+FWIjCCVHCKb7RXa74Py+xi8/yCN9wztZVszwu1 GTXHlYHs/+5b71YUB1HZ2jW2x48TesaXd4Emr5jK5yZkvg11JRqyK7k7lM5b33GMteZL KK7erNO0ijxdKiqNWS+huOqDTYzVhj2khydwnOiBS507h+9QHCqQKuGJKwlaVt1POxvM SAXQ== X-Gm-Message-State: AJIora+rHdZaamCrYfr2AnIh9uK5Ad2uAfyA0RKBUHuj0fIWP6egv66r YAux1owDDUEwsfCbH1hbPclwCQiID5pQIKCj X-Google-Smtp-Source: AGRyM1thhqvyGnz1B8Vxf/2phwUgpIo+oFuDvwayWQtnd+524pm6oLNhycj5/sutoRUawvMv1D4DGA== X-Received: by 2002:a17:907:6089:b0:72f:56db:ccb6 with SMTP id ht9-20020a170907608900b0072f56dbccb6mr21020085ejc.318.1659018530972; Thu, 28 Jul 2022 07:28:50 -0700 (PDT) Received: from nergzd-desktop.localdomain ([23.154.177.9]) by smtp.gmail.com with ESMTPSA id y1-20020aa7d501000000b0043cce1d3a0fsm755949edq.87.2022.07.28.07.28.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Jul 2022 07:28:50 -0700 (PDT) From: Markuss Broks To: linux-kernel@vger.kernel.org Cc: ~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org, Markuss Broks , Jonathan Corbet , Ard Biesheuvel , Greg Kroah-Hartman , Jiri Slaby , Helge Deller , "Paul E. McKenney" , Borislav Petkov , Andrew Morton , Kees Cook , Randy Dunlap , Damien Le Moal , Thomas Zimmermann , Javier Martinez Canillas , Michal Suchanek , Andy Shevchenko , Arnd Bergmann , Wei Ming Chen , Bartlomiej Zolnierkiewicz , Tony Lindgren , linux-doc@vger.kernel.org, linux-efi@vger.kernel.org, linux-serial@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, Petr Mladek Subject: [PATCH 1/2] drivers: serial: earlycon: Pass device-tree node Date: Thu, 28 Jul 2022 17:28:18 +0300 Message-Id: <20220728142824.3836-2-markuss.broks@gmail.com> X-Mailer: git-send-email 2.37.0 In-Reply-To: <20220728142824.3836-1-markuss.broks@gmail.com> References: <20220728142824.3836-1-markuss.broks@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org Pass a pointer to device-tree node in case the driver probed from OF. This makes early console drivers able to fetch options from device-tree node properties. Signed-off-by: Markuss Broks --- drivers/tty/serial/earlycon.c | 3 +++ include/linux/serial_core.h | 1 + 2 files changed, 4 insertions(+) diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 57c70851f22a0e78805f34d1a7700708104b6f6a..14e8a7fe54486a1c377a6659c37a73858de5bf0b 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -304,6 +304,9 @@ int __init of_setup_earlycon(const struct earlycon_id *match, strlcpy(early_console_dev.options, options, sizeof(early_console_dev.options)); } + + early_console_dev.node = node; + earlycon_init(&early_console_dev, match->name); err = match->setup(&early_console_dev, options); earlycon_print_info(&early_console_dev); diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index cbd5070bc87f42aa450c4ca7af8a9b59fbe88574..3295721f33e482124fae8370b5889d5d6c012303 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -349,6 +349,7 @@ struct earlycon_device { struct uart_port port; char options[16]; /* e.g., 115200n8 */ unsigned int baud; + unsigned long node; }; struct earlycon_id { From patchwork Thu Jul 28 14:28:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markuss Broks X-Patchwork-Id: 594158 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 03DACC19F2B for ; Thu, 28 Jul 2022 14:29:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232255AbiG1O3w (ORCPT ); Thu, 28 Jul 2022 10:29:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232043AbiG1O3b (ORCPT ); Thu, 28 Jul 2022 10:29:31 -0400 Received: from mail-ed1-x533.google.com (mail-ed1-x533.google.com [IPv6:2a00:1450:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 712A867C9B; Thu, 28 Jul 2022 07:29:03 -0700 (PDT) Received: by mail-ed1-x533.google.com with SMTP id z15so2394343edc.7; Thu, 28 Jul 2022 07:29:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=yEgZLwSNojzjlHThJFtJWVMPDAV4d3Y7zlW15rr2kME=; b=WZEhs/KyhuLZEc/Hug69GqwS+mPkSEaYw0/XJQAEW1XiVKBAMX2SD4O18JtIPUAWOs 1AWxJk1S3GGu4B+ZKRTxuIFhq+o4eP7HGE9VNYDZzJtpgWmDolykISjlgiQO+oLYT8Bg XNluILq6jf3s4lNpkTk3oeXwPFNMgXNyT7Td+Faiev06lP+Wv4wRTOhLumMwyukd6nTX y7uI9SstX5PPwfhvRVfkb3bNTNXtGOUIVTvLQ7wB2agaMoo744J6lYlrq5rLelmnHP9Z XM2XDmS4BvJsl+BhQ7YvhevDynUH/Se7IrBhMHZboN0XiGgs0JkRlcrdFwBWACPA6sGy 6wvA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=yEgZLwSNojzjlHThJFtJWVMPDAV4d3Y7zlW15rr2kME=; b=bayXweqeEB47CCMeetO1gZkKl4TTpF9S24+ZP0qqIQX8vGFHrNMeH1vmJtSGAUsy6j paVmEqDql6h/rCA6Z6jbEweVWkp9RWMEbBYR4sKPoO01IYoSPwjoYSR+2QiewUXO1QNR NQGh0SKrvGsCQsT5Gtf7DTp0ZoWRXy8EtIKooAyASdtnEvBb1bhAWDyHjaBocCy9rJ0Y E2KkvbD2XAwz9S/QgJuowxwCh0cZIvMSjnw1Oe1rsPWeuIrWBSRdtGooGBQU8V8n3wuT GvGtfyTwxyjsXb8Ph+io/hiznceg91gx7ny7iIU1eS65i293bw/iyOuwY9KAaW9kgODi IcOQ== X-Gm-Message-State: AJIora+cVCQIiWwPiKQnfiV2ShmdSyUgl/gWYJCzaFPVBhO7KplR65NX Xr2pIPjlSRY5vfFN39AyvQA7ILCVP0MAF68o X-Google-Smtp-Source: AGRyM1sIO4Fp+YQOasaqJeyHF7woOb9BeSRiNtDnR7PNieIUOrpwtNrRsbMEJKDqiAaDerube8zjNQ== X-Received: by 2002:a05:6402:11d3:b0:43c:436b:829 with SMTP id j19-20020a05640211d300b0043c436b0829mr13568320edw.324.1659018541031; Thu, 28 Jul 2022 07:29:01 -0700 (PDT) Received: from nergzd-desktop.localdomain ([23.154.177.9]) by smtp.gmail.com with ESMTPSA id y1-20020aa7d501000000b0043cce1d3a0fsm755949edq.87.2022.07.28.07.28.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Jul 2022 07:29:00 -0700 (PDT) From: Markuss Broks To: linux-kernel@vger.kernel.org Cc: ~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org, Markuss Broks , Jonathan Corbet , Ard Biesheuvel , Greg Kroah-Hartman , Jiri Slaby , Helge Deller , "Paul E. McKenney" , Borislav Petkov , Andrew Morton , Kees Cook , Randy Dunlap , Damien Le Moal , Thomas Zimmermann , Javier Martinez Canillas , Michal Suchanek , Andy Shevchenko , Arnd Bergmann , Wei Ming Chen , Bartlomiej Zolnierkiewicz , Tony Lindgren , linux-doc@vger.kernel.org, linux-efi@vger.kernel.org, linux-serial@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, Rob Herring Subject: [PATCH 2/2] efi: earlycon: Add support for generic framebuffers and move to fbdev subsystem Date: Thu, 28 Jul 2022 17:28:19 +0300 Message-Id: <20220728142824.3836-3-markuss.broks@gmail.com> X-Mailer: git-send-email 2.37.0 In-Reply-To: <20220728142824.3836-1-markuss.broks@gmail.com> References: <20220728142824.3836-1-markuss.broks@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org Add early console support for generic linear framebuffer devices. This driver supports probing from cmdline early parameters or from the device-tree using information in simple-framebuffer node. The EFI functionality should be retained in whole. The driver was disabled on ARM because of a bug in early_ioremap implementation on ARM. Signed-off-by: Markuss Broks Reported-by: kernel test robot --- .../admin-guide/kernel-parameters.txt | 12 +- MAINTAINERS | 5 + drivers/firmware/efi/Kconfig | 6 +- drivers/firmware/efi/Makefile | 1 - drivers/firmware/efi/earlycon.c | 246 -------------- drivers/video/fbdev/Kconfig | 11 + drivers/video/fbdev/Makefile | 1 + drivers/video/fbdev/earlycon.c | 301 ++++++++++++++++++ 8 files changed, 327 insertions(+), 256 deletions(-) delete mode 100644 drivers/firmware/efi/earlycon.c create mode 100644 drivers/video/fbdev/earlycon.c diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 8090130b544b0701237a7b657a29c83c000a60f4..22a8625bb342f95e731fcc3a24390fca2c0f194c 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1281,12 +1281,9 @@ specified address. The serial port must already be setup and configured. Options are not yet supported. - efifb,[options] + efifb Start an early, unaccelerated console on the EFI - memory mapped framebuffer (if available). On cache - coherent non-x86 systems that use system memory for - the framebuffer, pass the 'ram' option so that it is - mapped with the correct attributes. + memory mapped framebuffer (if available). linflex, Use early console provided by Freescale LINFlexD UART @@ -1294,6 +1291,11 @@ address must be provided, and the serial port must already be setup and configured. + simplefb,,,, + Use early console with simple framebuffer that is + pre-initialized by firmware. A valid base address, + width, height and pixel size must be provided. + earlyprintk= [X86,SH,ARM,M68k,S390] earlyprintk=vga earlyprintk=sclp diff --git a/MAINTAINERS b/MAINTAINERS index 1fc9ead83d2aa3e60ccc4cfa8ee16df09ef579bf..140dee7f6920197a895d310afdde67a0de474522 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7033,6 +7033,11 @@ Q: http://patchwork.linuxtv.org/project/linux-media/list/ T: git git://linuxtv.org/anttip/media_tree.git F: drivers/media/tuners/e4000* +EARLY CONSOLE FRAMEBUFFER DRIVER +M: Markuss Broks +S: Maintained +F: drivers/video/fbdev/earlycon.c + EARTH_PT1 MEDIA DRIVER M: Akihiro Tsukada L: linux-media@vger.kernel.org diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig index 7aa4717cdcac46f91dd202f868c463388eb02735..56241b2e19383d70387f07114a27bb4f33ac7857 100644 --- a/drivers/firmware/efi/Kconfig +++ b/drivers/firmware/efi/Kconfig @@ -259,10 +259,8 @@ config EFI_DISABLE_PCI_DMA may be used to override this option. config EFI_EARLYCON - def_bool y - depends on SERIAL_EARLYCON && !ARM && !IA64 - select FONT_SUPPORT - select ARCH_USE_MEMREMAP_PROT + bool "EFI early console support" + depends on FB_EARLYCON && !IA64 config EFI_CUSTOM_SSDT_OVERLAYS bool "Load custom ACPI SSDT overlay from an EFI variable" diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile index c02ff25dd47707090a2ab86ee4f330e467f878f5..64eea61fbb43d76ec2d5416d467dfbb9aa21bda0 100644 --- a/drivers/firmware/efi/Makefile +++ b/drivers/firmware/efi/Makefile @@ -44,6 +44,5 @@ obj-$(CONFIG_ARM64) += $(arm-obj-y) riscv-obj-$(CONFIG_EFI) := efi-init.o riscv-runtime.o obj-$(CONFIG_RISCV) += $(riscv-obj-y) obj-$(CONFIG_EFI_CAPSULE_LOADER) += capsule-loader.o -obj-$(CONFIG_EFI_EARLYCON) += earlycon.o obj-$(CONFIG_UEFI_CPER_ARM) += cper-arm.o obj-$(CONFIG_UEFI_CPER_X86) += cper-x86.o diff --git a/drivers/firmware/efi/earlycon.c b/drivers/firmware/efi/earlycon.c deleted file mode 100644 index a52236e11e5f73ddea5bb1f42ca2ca7c42425dab..0000000000000000000000000000000000000000 --- a/drivers/firmware/efi/earlycon.c +++ /dev/null @@ -1,246 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2013 Intel Corporation; author Matt Fleming - */ - -#include -#include -#include -#include -#include -#include -#include - -#include - -static const struct console *earlycon_console __initdata; -static const struct font_desc *font; -static u32 efi_x, efi_y; -static u64 fb_base; -static bool fb_wb; -static void *efi_fb; - -/* - * EFI earlycon needs to use early_memremap() to map the framebuffer. - * But early_memremap() is not usable for 'earlycon=efifb keep_bootcon', - * memremap() should be used instead. memremap() will be available after - * paging_init() which is earlier than initcall callbacks. Thus adding this - * early initcall function early_efi_map_fb() to map the whole EFI framebuffer. - */ -static int __init efi_earlycon_remap_fb(void) -{ - /* bail if there is no bootconsole or it has been disabled already */ - if (!earlycon_console || !(earlycon_console->flags & CON_ENABLED)) - return 0; - - efi_fb = memremap(fb_base, screen_info.lfb_size, - fb_wb ? MEMREMAP_WB : MEMREMAP_WC); - - return efi_fb ? 0 : -ENOMEM; -} -early_initcall(efi_earlycon_remap_fb); - -static int __init efi_earlycon_unmap_fb(void) -{ - /* unmap the bootconsole fb unless keep_bootcon has left it enabled */ - if (efi_fb && !(earlycon_console->flags & CON_ENABLED)) - memunmap(efi_fb); - return 0; -} -late_initcall(efi_earlycon_unmap_fb); - -static __ref void *efi_earlycon_map(unsigned long start, unsigned long len) -{ - pgprot_t fb_prot; - - if (efi_fb) - return efi_fb + start; - - fb_prot = fb_wb ? PAGE_KERNEL : pgprot_writecombine(PAGE_KERNEL); - return early_memremap_prot(fb_base + start, len, pgprot_val(fb_prot)); -} - -static __ref void efi_earlycon_unmap(void *addr, unsigned long len) -{ - if (efi_fb) - return; - - early_memunmap(addr, len); -} - -static void efi_earlycon_clear_scanline(unsigned int y) -{ - unsigned long *dst; - u16 len; - - len = screen_info.lfb_linelength; - dst = efi_earlycon_map(y*len, len); - if (!dst) - return; - - memset(dst, 0, len); - efi_earlycon_unmap(dst, len); -} - -static void efi_earlycon_scroll_up(void) -{ - unsigned long *dst, *src; - u16 len; - u32 i, height; - - len = screen_info.lfb_linelength; - height = screen_info.lfb_height; - - for (i = 0; i < height - font->height; i++) { - dst = efi_earlycon_map(i*len, len); - if (!dst) - return; - - src = efi_earlycon_map((i + font->height) * len, len); - if (!src) { - efi_earlycon_unmap(dst, len); - return; - } - - memmove(dst, src, len); - - efi_earlycon_unmap(src, len); - efi_earlycon_unmap(dst, len); - } -} - -static void efi_earlycon_write_char(u32 *dst, unsigned char c, unsigned int h) -{ - const u32 color_black = 0x00000000; - const u32 color_white = 0x00ffffff; - const u8 *src; - int m, n, bytes; - u8 x; - - bytes = BITS_TO_BYTES(font->width); - src = font->data + c * font->height * bytes + h * bytes; - - for (m = 0; m < font->width; m++) { - n = m % 8; - x = *(src + m / 8); - if ((x >> (7 - n)) & 1) - *dst = color_white; - else - *dst = color_black; - dst++; - } -} - -static void -efi_earlycon_write(struct console *con, const char *str, unsigned int num) -{ - struct screen_info *si; - unsigned int len; - const char *s; - void *dst; - - si = &screen_info; - len = si->lfb_linelength; - - while (num) { - unsigned int linemax; - unsigned int h, count = 0; - - for (s = str; *s && *s != '\n'; s++) { - if (count == num) - break; - count++; - } - - linemax = (si->lfb_width - efi_x) / font->width; - if (count > linemax) - count = linemax; - - for (h = 0; h < font->height; h++) { - unsigned int n, x; - - dst = efi_earlycon_map((efi_y + h) * len, len); - if (!dst) - return; - - s = str; - n = count; - x = efi_x; - - while (n-- > 0) { - efi_earlycon_write_char(dst + x*4, *s, h); - x += font->width; - s++; - } - - efi_earlycon_unmap(dst, len); - } - - num -= count; - efi_x += count * font->width; - str += count; - - if (num > 0 && *s == '\n') { - efi_x = 0; - efi_y += font->height; - str++; - num--; - } - - if (efi_x + font->width > si->lfb_width) { - efi_x = 0; - efi_y += font->height; - } - - if (efi_y + font->height > si->lfb_height) { - u32 i; - - efi_y -= font->height; - efi_earlycon_scroll_up(); - - for (i = 0; i < font->height; i++) - efi_earlycon_clear_scanline(efi_y + i); - } - } -} - -static int __init efi_earlycon_setup(struct earlycon_device *device, - const char *opt) -{ - struct screen_info *si; - u16 xres, yres; - u32 i; - - if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) - return -ENODEV; - - fb_base = screen_info.lfb_base; - if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) - fb_base |= (u64)screen_info.ext_lfb_base << 32; - - fb_wb = opt && !strcmp(opt, "ram"); - - si = &screen_info; - xres = si->lfb_width; - yres = si->lfb_height; - - /* - * efi_earlycon_write_char() implicitly assumes a framebuffer with - * 32 bits per pixel. - */ - if (si->lfb_depth != 32) - return -ENODEV; - - font = get_default_font(xres, yres, -1, -1); - if (!font) - return -ENODEV; - - efi_y = rounddown(yres, font->height) - font->height; - for (i = 0; i < (yres - efi_y) / font->height; i++) - efi_earlycon_scroll_up(); - - device->con->write = efi_earlycon_write; - earlycon_console = device->con; - return 0; -} -EARLYCON_DECLARE(efifb, efi_earlycon_setup); diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig index f2a6b81e45c41334db71cca35f4fa5a827f728fe..2bb3f7a9e6e0f8ad2e9042d8c602b1cdec30755c 100644 --- a/drivers/video/fbdev/Kconfig +++ b/drivers/video/fbdev/Kconfig @@ -627,6 +627,17 @@ config FB_VESA You will get a boot time penguin logo at no additional cost. Please read . If unsure, say Y. +config FB_EARLYCON + bool "Generic framebuffer early console" + depends on FB && SERIAL_EARLYCON && !ARM + select FONT_SUPPORT + select ARCH_USE_MEMREMAP_PROT + help + Say Y here if you want early console support for firmware established + linear framebuffer. Unless you are using EFI framebuffer, you need to + specify framebuffer geometry and address in device-tree or in kernel + command line. + config FB_EFI bool "EFI-based Framebuffer Support" depends on (FB = y) && !IA64 && EFI diff --git a/drivers/video/fbdev/Makefile b/drivers/video/fbdev/Makefile index 7795c4126706fd7bb832d94da5d14b0060849d1f..07406ab45a3f306a07d008a9f0a401347aeaa695 100644 --- a/drivers/video/fbdev/Makefile +++ b/drivers/video/fbdev/Makefile @@ -129,6 +129,7 @@ obj-$(CONFIG_FB_MX3) += mx3fb.o obj-$(CONFIG_FB_DA8XX) += da8xx-fb.o obj-$(CONFIG_FB_SSD1307) += ssd1307fb.o obj-$(CONFIG_FB_SIMPLE) += simplefb.o +obj-$(CONFIG_FB_EARLYCON) += earlycon.o # the test framebuffer is last obj-$(CONFIG_FB_VIRTUAL) += vfb.o diff --git a/drivers/video/fbdev/earlycon.c b/drivers/video/fbdev/earlycon.c new file mode 100644 index 0000000000000000000000000000000000000000..5f6f4b228a50f23c1c77cf7ba5d50ff833efdd46 --- /dev/null +++ b/drivers/video/fbdev/earlycon.c @@ -0,0 +1,301 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2013 Intel Corporation; author Matt Fleming + * Copyright (C) 2022 Markuss Broks + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct fb_earlycon { + u32 x, y, curr_x, curr_y, depth, stride; + size_t size; + phys_addr_t phys_base; + void __iomem *virt_base; +}; + +static const struct console *earlycon_console __initconst; +static struct fb_earlycon info; +static const struct font_desc *font; + +static int __init simplefb_earlycon_remap_fb(void) +{ + int is_ram; + /* bail if there is no bootconsole or it has been disabled already */ + if (!earlycon_console || !(earlycon_console->flags & CON_ENABLED)) + return 0; + + is_ram = region_intersects(info.phys_base, info.size, + IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE); + is_ram = is_ram == REGION_INTERSECTS; + + info.virt_base = memremap(info.phys_base, info.size, + is_ram ? MEMREMAP_WB : MEMREMAP_WC); + + return info.virt_base ? 0 : -ENOMEM; +} +early_initcall(simplefb_earlycon_remap_fb); + +static int __init simplefb_earlycon_unmap_fb(void) +{ + /* unmap the bootconsole fb unless keep_bootcon has left it enabled */ + if (info.virt_base && !(earlycon_console->flags & CON_ENABLED)) + memunmap(info.virt_base); + return 0; +} +late_initcall(simplefb_earlycon_unmap_fb); + +static __ref void *simplefb_earlycon_map(unsigned long start, unsigned long len) +{ + pgprot_t fb_prot; + + if (info.virt_base) + return info.virt_base + start; + + fb_prot = PAGE_KERNEL; + return early_memremap_prot(info.phys_base + start, len, pgprot_val(fb_prot)); +} + +static __ref void simplefb_earlycon_unmap(void *addr, unsigned long len) +{ + if (info.virt_base) + return; + + early_memunmap(addr, len); +} + +static void simplefb_earlycon_clear_scanline(unsigned int y) +{ + unsigned long *dst; + u16 len; + + len = info.stride; + dst = simplefb_earlycon_map(y * len, len); + if (!dst) + return; + + memset(dst, 0, len); + simplefb_earlycon_unmap(dst, len); +} + +static void simplefb_earlycon_scroll_up(void) +{ + unsigned long *dst, *src; + u16 len; + u32 i, height; + + len = info.stride; + height = info.y; + + for (i = 0; i < height - font->height; i++) { + dst = simplefb_earlycon_map(i * len, len); + if (!dst) + return; + + src = simplefb_earlycon_map((i + font->height) * len, len); + if (!src) { + simplefb_earlycon_unmap(dst, len); + return; + } + + memmove(dst, src, len); + + simplefb_earlycon_unmap(src, len); + simplefb_earlycon_unmap(dst, len); + } +} + +static void simplefb_earlycon_write_char(u8 *dst, unsigned char c, unsigned int h) +{ + const u8 *src; + int m, n, bytes; + u8 x; + + bytes = BITS_TO_BYTES(font->width); + src = font->data + c * font->height * bytes + h * bytes; + + for (m = 0; m < font->width; m++) { + n = m % 8; + x = *(src + m / 8); + if ((x >> (7 - n)) & 1) + memset(dst, 0xff, (info.depth / 8)); + else + memset(dst, 0, (info.depth / 8)); + dst += (info.depth / 8); + } +} + +static void +simplefb_earlycon_write(struct console *con, const char *str, unsigned int num) +{ + unsigned int len; + const char *s; + void *dst; + + len = info.stride; + + while (num) { + unsigned int linemax; + unsigned int h, count = 0; + + for (s = str; *s && *s != '\n'; s++) { + if (count == num) + break; + count++; + } + + linemax = (info.x - info.curr_x) / font->width; + if (count > linemax) + count = linemax; + + for (h = 0; h < font->height; h++) { + unsigned int n, x; + + dst = simplefb_earlycon_map((info.curr_y + h) * len, len); + if (!dst) + return; + + s = str; + n = count; + x = info.curr_x; + + while (n-- > 0) { + simplefb_earlycon_write_char(dst + (x * 4), *s, h); + x += font->width; + s++; + } + + simplefb_earlycon_unmap(dst, len); + } + + num -= count; + info.curr_x += count * font->width; + str += count; + + if (num > 0 && *s == '\n') { + info.curr_x = 0; + info.curr_y += font->height; + str++; + num--; + } + + if (info.curr_x + font->width > info.x) { + info.curr_x = 0; + info.curr_y += font->height; + } + + if (info.curr_y + font->height > info.y) { + u32 i; + + info.curr_y -= font->height; + simplefb_earlycon_scroll_up(); + + for (i = 0; i < font->height; i++) + simplefb_earlycon_clear_scanline(info.curr_y + i); + } + } +} + +static int __init simplefb_earlycon_setup_common(struct earlycon_device *device, + const char *opt) +{ + int i; + + info.stride = info.x * 4; + info.size = info.x * info.y * (info.depth / 8); + + font = get_default_font(info.x, info.y, -1, -1); + if (!font) + return -ENODEV; + + info.curr_y = rounddown(info.y, font->height) - font->height; + for (i = 0; i < (info.y - info.curr_y) / font->height; i++) + simplefb_earlycon_scroll_up(); + + device->con->write = simplefb_earlycon_write; + earlycon_console = device->con; + return 0; +} + +static int __init simplefb_earlycon_setup(struct earlycon_device *device, + const char *opt) +{ + struct uart_port *port = &device->port; + int ret; + + if (!port->mapbase) + return -ENODEV; + + info.phys_base = port->mapbase; + + ret = sscanf(device->options, "%u,%u,%u", &info.x, &info.y, &info.depth); + if (ret != 3) + return -ENODEV; + + return simplefb_earlycon_setup_common(device, opt); +} + +EARLYCON_DECLARE(simplefb, simplefb_earlycon_setup); + +#ifdef CONFIG_EFI_EARLYCON +static int __init simplefb_earlycon_setup_efi(struct earlycon_device *device, + const char *opt) +{ + if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) + return -ENODEV; + + info.phys_base = screen_info.lfb_base; + if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) + info.phys_base |= (u64)screen_info.ext_lfb_base << 32; + + info.x = screen_info.lfb_width; + info.y = screen_info.lfb_height; + info.depth = screen_info.lfb_depth; + + return simplefb_earlycon_setup_common(device, opt); +} + +EARLYCON_DECLARE(efifb, simplefb_earlycon_setup_efi); +#endif + +#ifdef CONFIG_OF_EARLY_FLATTREE +static int __init simplefb_earlycon_setup_of(struct earlycon_device *device, + const char *opt) +{ + struct uart_port *port = &device->port; + const __be32 *val; + + if (!port->mapbase) + return -ENODEV; + + info.phys_base = port->mapbase; + + val = of_get_flat_dt_prop(device->node, "width", NULL); + if (!val) + return -ENODEV; + info.x = be32_to_cpu(*val); + + val = of_get_flat_dt_prop(device->node, "height", NULL); + if (!val) + return -ENODEV; + info.y = be32_to_cpu(*val); + + val = of_get_flat_dt_prop(device->node, "stride", NULL); + if (!val) + return -ENODEV; + info.depth = (be32_to_cpu(*val) / info.x) * 8; + + return simplefb_earlycon_setup_common(device, opt); +} + +OF_EARLYCON_DECLARE(simplefb, "simple-framebuffer", simplefb_earlycon_setup_of); +#endif