From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pg0-x241.google.com ([2607:f8b0:400e:c05::241]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fTg5n-0000cD-7c for barebox@lists.infradead.org; Fri, 15 Jun 2018 04:12:18 +0000 Received: by mail-pg0-x241.google.com with SMTP id w8-v6so827001pgp.7 for ; Thu, 14 Jun 2018 21:11:56 -0700 (PDT) From: Andrey Smirnov Date: Thu, 14 Jun 2018 21:11:10 -0700 Message-Id: <20180615041136.23492-5-andrew.smirnov@gmail.com> In-Reply-To: <20180615041136.23492-1-andrew.smirnov@gmail.com> References: <20180615041136.23492-1-andrew.smirnov@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 02/27] console: Unify console_simple.c and pbl/console.c To: barebox@lists.infradead.org Cc: Andrey Smirnov Move all of the shared code into lib/console.c and convert both files to use that. Signed-off-by: Andrey Smirnov --- common/console_simple.c | 11 +--- include/console.h | 8 +++ lib/Makefile | 6 +- lib/console.c | 130 ++++++++++++++++++++++++++++++++++++++++ pbl/console.c | 15 +---- 5 files changed, 148 insertions(+), 22 deletions(-) create mode 100644 lib/console.c diff --git a/common/console_simple.c b/common/console_simple.c index 9675cbb0a..62b811b3f 100644 --- a/common/console_simple.c +++ b/common/console_simple.c @@ -7,7 +7,7 @@ LIST_HEAD(console_list); EXPORT_SYMBOL(console_list); -static struct console_device *console; +extern struct console_device *console; int console_puts(unsigned int ch, const char *str) { @@ -28,14 +28,7 @@ EXPORT_SYMBOL(console_puts); void console_putc(unsigned int ch, char c) { - if (!console) { - putc_ll(c); - return; - } - - console->putc(console, c); - if (c == '\n') - console->putc(console, '\r'); + __console_putc(__console_get_default(), c); } EXPORT_SYMBOL(console_putc); diff --git a/include/console.h b/include/console.h index c671be859..b3001ad16 100644 --- a/include/console.h +++ b/include/console.h @@ -69,6 +69,7 @@ struct console_device { struct cdev_operations fops; struct serdev_device serdev; + void *ctx; }; static inline struct serdev_device *to_serdev_device(struct device_d *d) @@ -209,4 +210,11 @@ static inline void pbl_set_putc(putc_func_t putcf, void *ctx) {} bool console_allow_color(void); +void __cdev_putc(struct console_device *cdev, char c); +void __console_putc(struct console_device *cdev, char c); + +struct console_device *__console_get_default(void); +void __console_set_putc(struct console_device *cdev, + putc_func_t putcf, void *ctx); + #endif diff --git a/lib/Makefile b/lib/Makefile index 09c250a1c..44188dc5a 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -65,4 +65,8 @@ obj-y += int_sqrt.o obj-y += parseopt.o obj-y += clz_ctz.o obj-$(CONFIG_CRC_CCITT) += crc-ccitt.o -obj-pbl-y += clock.o \ No newline at end of file +obj-pbl-y += clock.o +pbl-$(CONFIG_PBL_CONSOLE) += console.o +obj-$(CONFIG_CONSOLE_FULL) += console.o +obj-$(CONFIG_CONSOLE_SIMPLE) += console.o + diff --git a/lib/console.c b/lib/console.c new file mode 100644 index 000000000..d2d2ae775 --- /dev/null +++ b/lib/console.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0+ + +/* + * File containing all of the console-related code that is used by all + * possible consumers: PBL, CONSOLE_FULL, CONSOLE_SIMPLE, etc. + * + * Copyright (C) 2018 Zodiac Inflight Innovations + * Author: Andrey Smirnov + */ + +#include +#include + +/* + * Put this in the data section so that it survives the clearing of + * the BSS segment. + */ +#define __data __attribute__ ((section(".data"))) + +/** + * console_ll - most basic low-level console + */ +__data struct console_device console_ll = { + .putc = NULL, + .ctx = NULL, +}; +__data struct console_device *console; + +/** + * __console_ll_putc - Early, most primitive putc() implemenatation + * + * Internal function used as a .putc() callback in console_ll when + * nothing better is configured. + */ +static void __console_ll_putc(struct console_device *cdev, char c) +{ + putc_ll(c); +} + +/** + * __console_get_default - Return default output console + * + * Internal function used to determine which console to use for early + * output. It has the following two use-cases: + * + * 1. PBL, where it falls back onto console_ll and whatever it is + * set up to (either putc_ll or custome callback set with + * pbl_set_putc()) + * + * 2. CONSOLE_SIMPLE, where it falls back onto console_ll (which in + * this case always boils down to a putc_ll() call) until first + * (and only) console is registered via console_register(). + */ +struct console_device *__console_get_default(void) +{ + /* + * Doing on-demand initialization here as opposed to in the + * definition of console_ll above has that advantage that on + * some architecutres (e.g. AArch64) it allows us to avoid + * additional relocation and makes it possible to use console + * infrastructure before any relocation happens + */ + if (unlikely(!console_ll.putc)) + console_ll.putc = __console_ll_putc; + + if (IS_ENABLED(__PBL__) || !console) + return &console_ll; + + return console; +} + +/** + * __console_set_putc - Early console initalization helper + * + * @cdev: Console device to initialize + * @putcf: putc() implementation to be used for this console + * @ctx: Context to pass to putc() + * + * Internal function used to initialize early/trivial console devices + * capable of only outputting a single character + */ +void __console_set_putc(struct console_device *cdev, + putc_func_t putcf, void *ctx) +{ + cdev->putc = (void *)putcf; + cdev->ctx = ctx; +} + +/** + * __cdev_putc - Internal .putc() callback dispatcher + * + * @cdev: Console device to use + * @c: Character to print + * + * Internal .putc() callback dispatcher needed to correctly select + * which context to pass. + * + * This is needed becuase when being used in PBL in conjunction with + * pbl_set_putc(), .putc() callback is expecting to receive a void * + * context that was registered earlier. + * + * In the "normal" world, however all of the .putc() callback are + * written with expectation of receiving struct console_device * as a + * first argument. + * + * Accomodation of both of those use-cases is the purpoese of this + * function + */ +void __cdev_putc(struct console_device *cdev, char c) +{ + void *ctx = cdev->ctx ? : cdev; + + cdev->putc(ctx, c); +} + +/** + * __console_putc - Internal high-level putc() implementation + * + * @cdev: Console device to use + * @c: Character to print + * + * Internal high-level putc() implementation based on __cdev_putc() + * that performs correct '\n' -> '\n\r' substitution. + */ +void __console_putc(struct console_device *cdev, char c) +{ + __cdev_putc(cdev, c); + if (c == '\n') + __cdev_putc(cdev, '\r'); +} diff --git a/pbl/console.c b/pbl/console.c index 75576ec79..c1c3e1dde 100644 --- a/pbl/console.c +++ b/pbl/console.c @@ -2,12 +2,7 @@ #include #include -/* - * Put these in the data section so that they survive the clearing of the - * BSS segment. - */ -static __attribute__ ((section(".data"))) putc_func_t __putc; -static __attribute__ ((section(".data"))) void *putc_ctx; +extern struct console_device console_ll; /** * pbl_set_putc() - setup UART used for PBL console @@ -19,16 +14,12 @@ static __attribute__ ((section(".data"))) void *putc_ctx; */ void pbl_set_putc(putc_func_t putcf, void *ctx) { - __putc = putcf; - putc_ctx = ctx; + __console_set_putc(&console_ll, putcf, ctx); } void console_putc(unsigned int ch, char c) { - if (__putc) - __putc(putc_ctx, c); - else - putc_ll(c); + __cdev_putc(__console_get_default(), c); } int console_puts(unsigned int ch, const char *str) -- 2.17.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox