[PATCH V5 REPOST 5/7] video: add a driver for the bcm2835

Wed Mar 20 11:31:26 EDT 2013

Hi Stephen,

On Tue, 15 Jan 2013 19:26:57 -0700, Stephen Warren
<swarren at wwwdotorg.org> wrote:

> The firmware running on the bcm2835 SoC's VideoCore CPU manages the
> display controller. Add a simple "LCD" driver that communicates with the
> firmware using the property mailbox protocol. This configures the
> display and frame-buffer to match whatever physical resolution the
> firmware chosen when booting, which is typically the native resolution
> of the attached display device, presumably unless otherwise specified
> in config.txt on the boot media.
> 
> Enable this driver in the Raspberry Pi board configuration.
> 
> Signed-off-by: Stephen Warren <swarren at wwwdotorg.org>
> Acked-by: Anatolij Gustschin <agust at denx.de>
> ---
> v5: No change; merged patch series.
> v4: No change; rebased.
> v3: Re-license to GPL-v2 or later. Fix typo in commit description.
> v2: New patch.
> ---
>  drivers/video/Makefile  |    1 +
>  drivers/video/bcm2835.c |  127 +++++++++++++++++++++++++++++++++++++++++++++++
>  include/configs/rpi_b.h |   16 ++++++
>  3 files changed, 144 insertions(+)
>  create mode 100644 drivers/video/bcm2835.c
> 
> diff --git a/drivers/video/Makefile b/drivers/video/Makefile
> index 170a358..e8cecca 100644
> --- a/drivers/video/Makefile
> +++ b/drivers/video/Makefile
> @@ -40,6 +40,7 @@ COBJS-$(CONFIG_S6E63D6) += s6e63d6.o
>  COBJS-$(CONFIG_LD9040) += ld9040.o
>  COBJS-$(CONFIG_SED156X) += sed156x.o
>  COBJS-$(CONFIG_VIDEO_AMBA) += amba.o
> +COBJS-$(CONFIG_VIDEO_BCM2835) += bcm2835.o
>  COBJS-$(CONFIG_VIDEO_COREBOOT) += coreboot_fb.o
>  COBJS-$(CONFIG_VIDEO_CT69000) += ct69000.o videomodes.o
>  COBJS-$(CONFIG_VIDEO_DA8XX) += da8xx-fb.o videomodes.o
> diff --git a/drivers/video/bcm2835.c b/drivers/video/bcm2835.c
> new file mode 100644
> index 0000000..1e9a84a
> --- /dev/null
> +++ b/drivers/video/bcm2835.c
> @@ -0,0 +1,127 @@
> +/*
> + * (C) Copyright 2012 Stephen Warren
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <common.h>
> +#include <lcd.h>
> +#include <asm/arch/mbox.h>
> +#include <asm/global_data.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +/* Global variables that lcd.c expects to exist */
> +int lcd_line_length;
> +int lcd_color_fg;
> +int lcd_color_bg;
> +void *lcd_base;
> +void *lcd_console_address;
> +short console_col;
> +short console_row;
> +vidinfo_t panel_info;
> +char lcd_cursor_enabled;
> +ushort lcd_cursor_width;
> +ushort lcd_cursor_height;
> +
> +struct msg_query {
> +	struct bcm2835_mbox_hdr hdr;
> +	struct bcm2835_mbox_tag_physical_w_h physical_w_h;
> +	u32 end_tag;
> +};
> +
> +struct msg_setup {
> +	struct bcm2835_mbox_hdr hdr;
> +	struct bcm2835_mbox_tag_physical_w_h physical_w_h;
> +	struct bcm2835_mbox_tag_virtual_w_h virtual_w_h;
> +	struct bcm2835_mbox_tag_depth depth;
> +	struct bcm2835_mbox_tag_pixel_order pixel_order;
> +	struct bcm2835_mbox_tag_alpha_mode alpha_mode;
> +	struct bcm2835_mbox_tag_virtual_offset virtual_offset;
> +	struct bcm2835_mbox_tag_overscan overscan;
> +	struct bcm2835_mbox_tag_allocate_buffer allocate_buffer;
> +	u32 end_tag;
> +};
> +
> +void lcd_ctrl_init(void *lcdbase)
> +{
> +	ALLOC_ALIGN_BUFFER(struct msg_query, msg_query, 1, 16);
> +	ALLOC_ALIGN_BUFFER(struct msg_setup, msg_setup, 1, 16);
> +	int ret;
> +	u32 w, h;
> +
> +	debug("bcm2835: Query resolution...\n");
> +
> +	BCM2835_MBOX_INIT_HDR(msg_query);
> +	BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h,
> +					GET_PHYSICAL_W_H);
> +	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_query->hdr);
> +	if (ret) {
> +		printf("bcm2835: Could not query display resolution\n");
> +		/* FIXME: How to disable the LCD to prevent errors? hang()? */
> +		return;
> +	}
> +
> +	w = msg_query->physical_w_h.body.resp.width;
> +	h = msg_query->physical_w_h.body.resp.height;
> +
> +	debug("bcm2835: Setting up display for %d x %d\n", w, h);
> +
> +	BCM2835_MBOX_INIT_HDR(msg_setup);
> +	BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H);
> +	msg_setup->physical_w_h.body.req.width = w;
> +	msg_setup->physical_w_h.body.req.height = h;
> +	BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H);
> +	msg_setup->virtual_w_h.body.req.width = w;
> +	msg_setup->virtual_w_h.body.req.height = h;
> +	BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH);
> +	msg_setup->depth.body.req.bpp = 16;
> +	BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER);
> +	msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_BGR;
> +	BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE);
> +	msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
> +	BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET);
> +	msg_setup->virtual_offset.body.req.x = 0;
> +	msg_setup->virtual_offset.body.req.y = 0;
> +	BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN);
> +	msg_setup->overscan.body.req.top = 0;
> +	msg_setup->overscan.body.req.bottom = 0;
> +	msg_setup->overscan.body.req.left = 0;
> +	msg_setup->overscan.body.req.right = 0;
> +	BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER);
> +	msg_setup->allocate_buffer.body.req.alignment = 0x100;
> +
> +	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr);
> +	if (ret) {
> +		printf("bcm2835: Could not configure display\n");
> +		/* FIXME: How to disable the LCD to prevent errors? hang()? */
> +		return;
> +	}
> +
> +	w = msg_setup->physical_w_h.body.resp.width;
> +	h = msg_setup->physical_w_h.body.resp.height;
> +
> +	debug("bcm2835: Final resolution is %d x %d\n", w, h);
> +
> +	panel_info.vl_col = w;
> +	panel_info.vl_row = h;
> +	panel_info.vl_bpix = LCD_COLOR16;
> +
> +	gd->fb_base = msg_setup->allocate_buffer.body.resp.fb_address;
> +	lcd_base = (void *)gd->fb_base;
> +}
> +
> +void lcd_enable(void)
> +{
> +}
> diff --git a/include/configs/rpi_b.h b/include/configs/rpi_b.h
> index 5db31f5..e485a06 100644
> --- a/include/configs/rpi_b.h
> +++ b/include/configs/rpi_b.h
> @@ -58,6 +58,17 @@
>  /* Devices */
>  /* GPIO */
>  #define CONFIG_BCM2835_GPIO
> +/* LCD */
> +#define CONFIG_LCD
> +#define LCD_BPP				LCD_COLOR16
> +/*
> + * Prevent allocation of RAM for FB; the real FB address is queried
> + * dynamically from the VideoCore co-processor, and comes from RAM
> + * not owned by the ARM CPU.
> + */
> +#define CONFIG_FB_ADDR			0
> +#define CONFIG_VIDEO_BCM2835
> +#define CONFIG_SYS_WHITE_ON_BLACK
>  
>  /* Console UART */
>  #define CONFIG_PL011_SERIAL
> @@ -75,6 +86,11 @@
>  #define CONFIG_ENV_SIZE			SZ_16K
>  #define CONFIG_ENV_IS_NOWHERE
>  #define CONFIG_SYS_LOAD_ADDR		0x1000000
> +#define CONFIG_CONSOLE_MUX
> +#define CONFIG_SYS_CONSOLE_IS_IN_ENV
> +#define CONFIG_EXTRA_ENV_SETTINGS	"stdin=serial\0" \
> +					"stderr=serial,lcd\0" \
> +					"stdout=serial,lcd\0"
>  
>  /* Shell */
>  #define CONFIG_SYS_HUSH_PARSER

Applied to u-boot-arm/master, thanks!

Amicalement,
-- 
Albert.