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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 7/7] xen/arm: introduce a driver for the ARM HDLCD controller
Read the screen resolution setting from device tree, find the
corresponding modeline in a small table of standard video modes, set the
hardware accordingly.
Use vexpress_syscfg to configure the pixel clock.
Use the generic framebuffer functions to print on the screen.
Changes in v4:
- use a lookup table to set the color masks;
- fix indentation;
- make sure mode_string is not NULL and is not bigger than 16 chars
before continuing;
- introduce 2 separate error messages for !hdlcd_start and
!framebuffer_start at the beginning of video_init;
- mark get_color_masks and set_pixclock as __init;
- check that we are running on a vexpress machine before calling
vexpress_syscfg.
Changes in v2:
- read mode from DT;
- support multiple resolutions;
- use vexpress_syscfg to set the pixclock.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
xen/arch/arm/Rules.mk | 1 +
xen/drivers/video/Makefile | 1 +
xen/drivers/video/arm_hdlcd.c | 280 +++++++++++++++++++++++++++++++++++++++++
xen/drivers/video/modelines.h | 77 +++++++++++
xen/include/asm-arm/config.h | 2 +
5 files changed, 361 insertions(+), 0 deletions(-)
create mode 100644 xen/drivers/video/arm_hdlcd.c
create mode 100644 xen/drivers/video/modelines.h
diff --git a/xen/arch/arm/Rules.mk b/xen/arch/arm/Rules.mk
index fa9f9c1..9580e6b 100644
--- a/xen/arch/arm/Rules.mk
+++ b/xen/arch/arm/Rules.mk
@@ -8,6 +8,7 @@
HAS_DEVICE_TREE := y
HAS_VIDEO := y
+HAS_ARM_HDLCD := y
CFLAGS += -fno-builtin -fno-common -Wredundant-decls
CFLAGS += -iwithprefix include -Werror -Wno-pointer-arith -pipe
diff --git a/xen/drivers/video/Makefile b/xen/drivers/video/Makefile
index 77f9d5d..a756292 100644
--- a/xen/drivers/video/Makefile
+++ b/xen/drivers/video/Makefile
@@ -4,3 +4,4 @@ obj-$(HAS_VIDEO) += font_8x16.o
obj-$(HAS_VIDEO) += font_8x8.o
obj-$(HAS_VIDEO) += lfb.o
obj-$(HAS_VGA) += vesa.o
+obj-$(HAS_ARM_HDLCD) += arm_hdlcd.o
diff --git a/xen/drivers/video/arm_hdlcd.c b/xen/drivers/video/arm_hdlcd.c
new file mode 100644
index 0000000..1057f5d
--- /dev/null
+++ b/xen/drivers/video/arm_hdlcd.c
@@ -0,0 +1,280 @@
+/*
+ * xen/drivers/video/arm_hdlcd.c
+ *
+ * Driver for ARM HDLCD Controller
+ *
+ * Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
+ * Copyright (c) 2013 Citrix Systems.
+ *
+ * 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 <asm/delay.h>
+#include <asm/types.h>
+#include <asm/platforms/vexpress.h>
+#include <xen/config.h>
+#include <xen/device_tree.h>
+#include <xen/libfdt/libfdt.h>
+#include <xen/init.h>
+#include <xen/mm.h>
+#include "font.h"
+#include "lfb.h"
+#include "modelines.h"
+
+#define HDLCD ((volatile uint32_t *) FIXMAP_ADDR(FIXMAP_MISC))
+
+#define HDLCD_INTMASK (0x18/4)
+#define HDLCD_FBBASE (0x100/4)
+#define HDLCD_LINELENGTH (0x104/4)
+#define HDLCD_LINECOUNT (0x108/4)
+#define HDLCD_LINEPITCH (0x10C/4)
+#define HDLCD_BUS (0x110/4)
+#define HDLCD_VSYNC (0x200/4)
+#define HDLCD_VBACK (0x204/4)
+#define HDLCD_VDATA (0x208/4)
+#define HDLCD_VFRONT (0x20C/4)
+#define HDLCD_HSYNC (0x210/4)
+#define HDLCD_HBACK (0x214/4)
+#define HDLCD_HDATA (0x218/4)
+#define HDLCD_HFRONT (0x21C/4)
+#define HDLCD_POLARITIES (0x220/4)
+#define HDLCD_COMMAND (0x230/4)
+#define HDLCD_PF (0x240/4)
+#define HDLCD_RED (0x244/4)
+#define HDLCD_GREEN (0x248/4)
+#define HDLCD_BLUE (0x24C/4)
+
+struct color_masks {
+ int red_shift;
+ int red_size;
+ int green_shift;
+ int green_size;
+ int blue_shift;
+ int blue_size;
+};
+
+struct pixel_colors {
+ const char* bpp;
+ struct color_masks colors;
+};
+
+struct pixel_colors __initdata colors[] = {
+ { "16", { 0, 5, 11, 5, 6, 5 } },
+ { "24", { 0, 8, 16, 8, 8, 8 } },
+ { "32", { 0, 8, 16, 8, 8, 8 } },
+};
+
+static void vga_noop_puts(const char *s) {}
+void (*video_puts)(const char *) = vga_noop_puts;
+
+static void hdlcd_flush(void)
+{
+ dsb();
+}
+
+static int __init get_color_masks(const char* bpp, struct color_masks **masks)
+{
+ int i;
+ for ( i = 0; i < ARRAY_SIZE(colors); i++ )
+ {
+ if ( !strncmp(colors[i].bpp, bpp, 2) )
+ {
+ *masks = &colors[i].colors;
+ return 0;
+ }
+ }
+ return -1;
+}
+
+static void __init set_pixclock(uint32_t pixclock)
+{
+ if ( device_tree_node_compatible(device_tree_flattened, 0, "arm,vexpress")
)
+ vexpress_syscfg(1, V2M_SYS_CFG_OSC_FUNC,
+ V2M_SYS_CFG_OSC5, &pixclock);
+}
+
+void __init video_init(void)
+{
+ int node, depth;
+ u32 address_cells, size_cells;
+ struct lfb_prop lfbp;
+ unsigned char *lfb;
+ paddr_t hdlcd_start, hdlcd_size;
+ paddr_t framebuffer_start, framebuffer_size;
+ const struct fdt_property *prop;
+ const u32 *cell;
+ const char *mode_string;
+ char _mode_string[16];
+ int bytes_per_pixel = 4;
+ struct color_masks *c = NULL;
+ struct modeline *videomode = NULL;
+ int i;
+
+ if ( find_compatible_node("arm,hdlcd", &node, &depth,
+ &address_cells, &size_cells) <= 0 )
+ return;
+
+ prop = fdt_get_property(device_tree_flattened, node, "reg", NULL);
+ if ( !prop )
+ return;
+
+ cell = (const u32 *)prop->data;
+ device_tree_get_reg(&cell, address_cells, size_cells,
+ &hdlcd_start, &hdlcd_size);
+
+ prop = fdt_get_property(device_tree_flattened, node, "framebuffer", NULL);
+ if ( !prop )
+ return;
+
+ cell = (const u32 *)prop->data;
+ device_tree_get_reg(&cell, address_cells, size_cells,
+ &framebuffer_start, &framebuffer_size);
+
+ if ( !hdlcd_start )
+ {
+ printk(KERN_ERR "HDLCD address missing from device tree, disabling
driver\n");
+ return;
+ }
+
+ if ( !hdlcd_start || !framebuffer_start )
+ {
+ printk(KERN_ERR "HDLCD: framebuffer address missing from device tree,
disabling driver\n");
+ return;
+ }
+
+ mode_string = fdt_getprop(device_tree_flattened, node, "mode", NULL);
+ if ( !mode_string )
+ {
+ get_color_masks("32", &c);
+ memcpy(_mode_string, "1280x1024@60", strlen("1280x1024@60"));
+ bytes_per_pixel = 4;
+ }
+ else if ( strlen(mode_string) < strlen("800x600@60") ||
+ strlen(mode_string) > sizeof(_mode_string) - 1 )
+ {
+ printk(KERN_ERR "HDLCD: invalid modeline=%s\n", mode_string);
+ return;
+ } else {
+ char *s = strchr(mode_string, '-');
+ if ( !s )
+ {
+ printk(KERN_INFO "HDLCD: bpp not found in modeline %s, assume 32
bpp\n",
+ mode_string);
+ get_color_masks("32", &c);
+ memcpy(_mode_string, mode_string, strlen(mode_string) + 1);
+ bytes_per_pixel = 4;
+ } else {
+ if ( strlen(s) < 6 )
+ {
+ printk(KERN_ERR "HDLCD: invalid mode %s\n", mode_string);
+ return;
+ }
+ s++;
+ if ( get_color_masks(s, &c) < 0 )
+ {
+ printk(KERN_WARNING "HDLCD: unsupported bpp %s\n", s);
+ return;
+ }
+ bytes_per_pixel = simple_strtoll(s, NULL, 10) / 8;
+ }
+ i = s - mode_string - 1;
+ memcpy(_mode_string, mode_string, i);
+ memcpy(_mode_string + i, mode_string + i + 3, 4);
+ }
+
+ for ( i = 0; i < ARRAY_SIZE(videomodes); i++ ) {
+ if ( !strcmp(_mode_string, videomodes[i].mode) )
+ {
+ videomode = &videomodes[i];
+ break;
+ }
+ }
+ if ( !videomode )
+ {
+ printk(KERN_WARNING "HDLCD: unsupported videomode %s\n", _mode_string);
+ return;
+ }
+
+ if ( framebuffer_size < bytes_per_pixel * videomode->xres *
videomode->yres )
+ {
+ printk(KERN_ERR "HDLCD: the framebuffer is too small, disabling the
HDLCD driver\n");
+ return;
+ }
+
+ printk(KERN_INFO "Initializing HDLCD driver\n");
+
+ lfb = early_ioremap(framebuffer_start, framebuffer_size, DEV_WC);
+ if ( !lfb )
+ {
+ printk(KERN_ERR "Couldn't map the framebuffer\n");
+ return;
+ }
+ memset(lfb, 0x00, bytes_per_pixel * videomode->xres * videomode->yres);
+
+ /* uses FIXMAP_MISC */
+ set_pixclock(videomode->pixclock);
+
+ set_fixmap(FIXMAP_MISC, hdlcd_start >> PAGE_SHIFT, DEV_SHARED);
+ HDLCD[HDLCD_COMMAND] = 0;
+
+ HDLCD[HDLCD_LINELENGTH] = videomode->xres * bytes_per_pixel;
+ HDLCD[HDLCD_LINECOUNT] = videomode->yres - 1;
+ HDLCD[HDLCD_LINEPITCH] = videomode->xres * bytes_per_pixel;
+ HDLCD[HDLCD_PF] = ((bytes_per_pixel - 1) << 3);
+ HDLCD[HDLCD_INTMASK] = 0;
+ HDLCD[HDLCD_FBBASE] = framebuffer_start;
+ HDLCD[HDLCD_BUS] = 0xf00 | (1 << 4);
+ HDLCD[HDLCD_VBACK] = videomode->vback - 1;
+ HDLCD[HDLCD_VSYNC] = videomode->vsync - 1;
+ HDLCD[HDLCD_VDATA] = videomode->yres - 1;
+ HDLCD[HDLCD_VFRONT] = videomode->vfront - 1;
+ HDLCD[HDLCD_HBACK] = videomode->hback - 1;
+ HDLCD[HDLCD_HSYNC] = videomode->hsync - 1;
+ HDLCD[HDLCD_HDATA] = videomode->xres - 1;
+ HDLCD[HDLCD_HFRONT] = videomode->hfront - 1;
+ HDLCD[HDLCD_POLARITIES] = (1 << 2) | (1 << 3);
+ HDLCD[HDLCD_RED] = (c->red_size << 8) | c->red_shift;
+ HDLCD[HDLCD_GREEN] = (c->green_size << 8) | c->green_shift;
+ HDLCD[HDLCD_BLUE] = (c->blue_size << 8) | c->blue_shift;
+ HDLCD[HDLCD_COMMAND] = 1;
+ clear_fixmap(FIXMAP_MISC);
+
+ lfbp.pixel_on = (((1 << c->red_size) - 1) << c->red_shift) |
+ (((1 << c->green_size) - 1) << c->green_shift) |
+ (((1 << c->blue_size) - 1) << c->blue_shift);
+ lfbp.lfb = lfb;
+ lfbp.font = &font_vga_8x16;
+ lfbp.bits_per_pixel = bytes_per_pixel*8;
+ lfbp.bytes_per_line = bytes_per_pixel*videomode->xres;
+ lfbp.width = videomode->xres;
+ lfbp.height = videomode->yres;
+ lfbp.flush = hdlcd_flush;
+ lfbp.text_columns = videomode->xres / 8;
+ lfbp.text_rows = videomode->yres / 16;
+ if ( lfb_init(&lfbp) < 0 )
+ return;
+ video_puts = lfb_scroll_puts;
+}
+
+void video_endboot(void)
+{
+ if ( video_puts != vga_noop_puts )
+ lfb_alloc();
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/drivers/video/modelines.h b/xen/drivers/video/modelines.h
new file mode 100644
index 0000000..9cb7cdd
--- /dev/null
+++ b/xen/drivers/video/modelines.h
@@ -0,0 +1,77 @@
+/*
+ * xen/drivers/video/modelines.h
+ *
+ * Timings for many popular monitor resolutions
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Copyright (c) 1999 by The XFree86 Project, Inc.
+ * Copyright (c) 2013 Citrix Systems
+ */
+
+#ifndef _XEN_MODLINES_H
+#define _XEN_MODLINES_H
+
+struct modeline {
+ const char* mode; /* in the form 1280x1024@60 */
+ uint32_t pixclock; /* Khz */
+ uint32_t xres;
+ uint32_t hfront; /* horizontal front porch in pixels */
+ uint32_t hsync; /* horizontal sync pulse in pixels */
+ uint32_t hback; /* horizontal back porch in pixels */
+ uint32_t yres;
+ uint32_t vfront; /* vertical front porch in lines */
+ uint32_t vsync; /* vertical sync pulse in lines */
+ uint32_t vback; /* vertical back porch in lines */
+};
+
+struct modeline __initdata videomodes[] = {
+ { "640x480@60", 25175, 640, 16, 96, 48, 480, 11, 2, 31 },
+ { "640x480@72", 31500, 640, 24, 40, 128, 480, 9, 3, 28 },
+ { "640x480@75", 31500, 640, 16, 96, 48, 480, 11, 2, 32 },
+ { "640x480@85", 36000, 640, 32, 48, 112, 480, 1, 3, 25 },
+ { "800x600@56", 38100, 800, 32, 128, 128, 600, 1, 4, 14 },
+ { "800x600@60", 40000, 800, 40, 128, 88 , 600, 1, 4, 23 },
+ { "800x600@72", 50000, 800, 56, 120, 64 , 600, 37, 6, 23 },
+ { "800x600@75", 49500, 800, 16, 80, 160, 600, 1, 2, 21 },
+ { "800x600@85", 56250, 800, 32, 64, 152, 600, 1, 3, 27 },
+ { "1024x768@60", 65000, 1024, 24, 136, 160, 768, 3, 6, 29 },
+ { "1024x768@70", 75000, 1024, 24, 136, 144, 768, 3, 6, 29 },
+ { "1024x768@75", 78750, 1024, 16, 96, 176, 768, 1, 3, 28 },
+ { "1024x768@85", 94500, 1024, 48, 96, 208, 768, 1, 3, 36 },
+ { "1280x1024@60", 108000, 1280, 48, 112, 248, 1024, 1, 3, 38 },
+ { "1280x1024@75", 135000, 1280, 16, 144, 248, 1024, 1, 3, 38 },
+ { "1280x1024@85", 157500, 1280, 64, 160, 224, 1024, 1, 3, 44 },
+ { "1400x1050@60", 122610, 1400, 88, 152, 240, 1050, 1, 3, 33 },
+ { "1400x1050@75", 155850, 1400, 96, 152, 248, 1050, 1, 3, 42 },
+ { "1600x1200@60", 162000, 1600, 64, 192, 304, 1200, 1, 3, 46 },
+ { "1600x1200@65", 175500, 1600, 64, 192, 304, 1200, 1, 3, 46 },
+ { "1600x1200@70", 189000, 1600, 64, 192, 304, 1200, 1, 3, 46 },
+ { "1600x1200@75", 202500, 1600, 64, 192, 304, 1200, 1, 3, 46 },
+ { "1600x1200@85", 229500, 1600, 64, 192, 304, 1200, 1, 3, 46 },
+ { "1792x1344@60", 204800, 1792, 128, 200, 328, 1344, 1, 3, 46 },
+ { "1792x1344@75", 261000, 1792, 96, 216, 352, 1344, 1, 3, 69 },
+ { "1856x1392@60", 218300, 1856, 96, 224, 352, 1392, 1, 3, 43 },
+ { "1856x1392@75", 288000, 1856, 128, 224, 352, 1392, 1, 3, 104 },
+ { "1920x1200@75", 193160, 1920, 128, 208, 336, 1200, 1, 3, 38 },
+ { "1920x1440@60", 234000, 1920, 128, 208, 344, 1440, 1, 3, 56 },
+ { "1920x1440@75", 297000, 1920, 144, 224, 352, 1440, 1, 3, 56 },
+};
+
+#endif
diff --git a/xen/include/asm-arm/config.h b/xen/include/asm-arm/config.h
index e5dce5e..8e934a4 100644
--- a/xen/include/asm-arm/config.h
+++ b/xen/include/asm-arm/config.h
@@ -19,6 +19,8 @@
#define CONFIG_DOMAIN_PAGE 1
+#define CONFIG_VIDEO 1
+
#define OPT_CONSOLE_STR "com1"
#ifdef MAX_PHYS_CPUS
--
1.7.2.5
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