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SubjectRe: [patch 2.5] VGA IO on systems with multiple PCI IO domains
Here's the patch that converts vgacon.c to pci_request_legacy_resource().
Tested on i386 and a single-bus alpha (alpha specific bits not included
here).

Note that it breaks ppc, as VGA_MAP_MEM() is removed...

Ivan.


diff -urpN 2.5.59/drivers/video/console/vgacon.c linux/drivers/video/console/vgacon.c
--- 2.5.59/drivers/video/console/vgacon.c Fri Jan 17 05:22:05 2003
+++ linux/drivers/video/console/vgacon.c Tue Jan 28 15:54:41 2003
@@ -47,8 +47,8 @@
#include <linux/vt_kern.h>
#include <linux/selection.h>
#include <linux/spinlock.h>
-#include <linux/ioport.h>
#include <linux/init.h>
+#include <linux/pci.h>

#include <asm/io.h>

@@ -66,15 +66,15 @@ static spinlock_t vga_lock = SPIN_LOCK_U
*/
#undef TRIDENT_GLITCH

-#define dac_reg 0x3c8
-#define dac_val 0x3c9
-#define attrib_port 0x3c0
-#define seq_port_reg 0x3c4
-#define seq_port_val 0x3c5
-#define gr_port_reg 0x3ce
-#define gr_port_val 0x3cf
-#define video_misc_rd 0x3cc
-#define video_misc_wr 0x3c2
+#define dac_reg (console_resource->start + 0x8)
+#define dac_val (console_resource->start + 0x9)
+#define attrib_port (console_resource->start + 0x0)
+#define seq_port_reg (console_resource->start + 0x4)
+#define seq_port_val (console_resource->start + 0x5)
+#define gr_port_reg (console_resource->start + 0xe)
+#define gr_port_val (console_resource->start + 0xf)
+#define video_misc_rd (console_resource->start + 0xc)
+#define video_misc_wr (console_resource->start + 0x2)

/*
* Interface used by the world
@@ -100,8 +100,8 @@ static unsigned long vgacon_uni_pagedir[
/* Description of the hardware situation */
static unsigned long vga_vram_base; /* Base of video memory */
static unsigned long vga_vram_end; /* End of video memory */
-static u16 vga_video_port_reg; /* Video register select port */
-static u16 vga_video_port_val; /* Video register value port */
+static unsigned long vga_video_port_reg; /* Video register select port */
+static unsigned long vga_video_port_val; /* Video register value port */
static unsigned int vga_video_num_columns; /* Number of text columns */
static unsigned int vga_video_num_lines; /* Number of text lines */
static int vga_can_do_color = 0; /* Do we support colors? */
@@ -116,6 +116,7 @@ static int vga_is_gfx;
static int vga_512_chars;
static int vga_video_font_height;
static unsigned int vga_rolled_over = 0;
+static struct resource *console_resource;


static int __init no_scroll(char *str)
@@ -166,6 +167,9 @@ static inline void write_vga(unsigned ch
static const char __init *vgacon_startup(void)
{
const char *display_desc = NULL;
+ static struct resource console_mem_resource = { "Video RAM area", 0, 0,
+ IORESOURCE_MEM };
+ unsigned long vram_size;
u16 saved1, saved2;
volatile u16 *p;

@@ -193,34 +197,35 @@ static const char __init *vgacon_startup
if (ORIG_VIDEO_MODE == 7) /* Is this a monochrome display? */
{
vga_vram_base = 0xb0000;
- vga_video_port_reg = 0x3b4;
- vga_video_port_val = 0x3b5;
if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10)
{
- static struct resource ega_console_resource = { "ega", 0x3B0, 0x3BF };
+ static struct resource ega_console_resource = { "ega", 0x3B0, 0x3BF, IORESOURCE_IO };
vga_video_type = VIDEO_TYPE_EGAM;
vga_vram_end = 0xb8000;
display_desc = "EGA+";
- request_resource(&ioport_resource, &ega_console_resource);
+ console_resource = &ega_console_resource;
}
else
{
- static struct resource mda1_console_resource = { "mda", 0x3B0, 0x3BB };
- static struct resource mda2_console_resource = { "mda", 0x3BF, 0x3BF };
+ static struct resource mda1_console_resource = { "mda", 0x3B0, 0x3BB, IORESOURCE_IO };
+ static struct resource mda2_console_resource = { "mda", 0x3BF, 0x3BF, IORESOURCE_IO };
vga_video_type = VIDEO_TYPE_MDA;
vga_vram_end = 0xb2000;
display_desc = "*MDA";
- request_resource(&ioport_resource, &mda1_console_resource);
- request_resource(&ioport_resource, &mda2_console_resource);
+ if (pci_request_legacy_resource(NULL, &mda2_console_resource) < 0)
+ goto no_vga;
+ console_resource = &mda1_console_resource;
vga_video_font_height = 14;
}
+ if (pci_request_legacy_resource(NULL, console_resource) < 0)
+ goto no_vga;
+ vga_video_port_reg = console_resource->start + 0x4; /* 0x3b4 */
+ vga_video_port_val = console_resource->start + 0x5; /* 0x3b5 */
}
else /* If not, it is color. */
{
vga_can_do_color = 1;
vga_vram_base = 0xb8000;
- vga_video_port_reg = 0x3d4;
- vga_video_port_val = 0x3d5;
if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10)
{
int i;
@@ -228,15 +233,19 @@ static const char __init *vgacon_startup
vga_vram_end = 0xc0000;

if (!ORIG_VIDEO_ISVGA) {
- static struct resource ega_console_resource = { "ega", 0x3C0, 0x3DF };
+ static struct resource ega_console_resource = { "ega", 0x3C0, 0x3DF, IORESOURCE_IO };
vga_video_type = VIDEO_TYPE_EGAC;
display_desc = "EGA";
- request_resource(&ioport_resource, &ega_console_resource);
+ console_resource = &ega_console_resource;
+ if (pci_request_legacy_resource(NULL, console_resource) < 0)
+ goto no_vga;
} else {
- static struct resource vga_console_resource = { "vga+", 0x3C0, 0x3DF };
+ static struct resource vga_console_resource = { "vga+", 0x3C0, 0x3DF, IORESOURCE_IO };
vga_video_type = VIDEO_TYPE_VGAC;
display_desc = "VGA+";
- request_resource(&ioport_resource, &vga_console_resource);
+ console_resource = &vga_console_resource;
+ if (pci_request_legacy_resource(NULL, console_resource) < 0)
+ goto no_vga;

#ifdef VGA_CAN_DO_64KB
/*
@@ -247,8 +256,8 @@ static const char __init *vgacon_startup
*/
vga_vram_base = 0xa0000;
vga_vram_end = 0xb0000;
- outb_p (6, 0x3ce) ;
- outb_p (6, 0x3cf) ;
+ outb_p (6, gr_port_reg) ;
+ outb_p (6, gr_port_val) ;
#endif

/*
@@ -258,36 +267,47 @@ static const char __init *vgacon_startup
*/

for (i=0; i<16; i++) {
- inb_p (0x3da) ;
- outb_p (i, 0x3c0) ;
- outb_p (i, 0x3c0) ;
+ inb_p (console_resource->start + 0x1a) ; /* 0x3da */
+ outb_p (i, attrib_port) ;
+ outb_p (i, attrib_port) ;
}
- outb_p (0x20, 0x3c0) ;
+ outb_p (0x20, attrib_port) ;

/* now set the DAC registers back to their
* default values */

for (i=0; i<16; i++) {
- outb_p (color_table[i], 0x3c8) ;
- outb_p (default_red[i], 0x3c9) ;
- outb_p (default_grn[i], 0x3c9) ;
- outb_p (default_blu[i], 0x3c9) ;
+ outb_p (color_table[i], dac_reg) ;
+ outb_p (default_red[i], dac_val) ;
+ outb_p (default_grn[i], dac_val) ;
+ outb_p (default_blu[i], dac_val) ;
}
}
+ vga_video_port_reg = console_resource->start + 0x14; /* 0x3d4 */
+ vga_video_port_val = console_resource->start + 0x15; /* 0x3d5 */
}
else
{
- static struct resource cga_console_resource = { "cga", 0x3D4, 0x3D5 };
+ static struct resource cga_console_resource = { "cga", 0x3D4, 0x3D5, IORESOURCE_IO };
vga_video_type = VIDEO_TYPE_CGA;
vga_vram_end = 0xba000;
display_desc = "*CGA";
- request_resource(&ioport_resource, &cga_console_resource);
+ console_resource = &cga_console_resource;
+ if (pci_request_legacy_resource(NULL, console_resource) < 0)
+ goto no_vga;
vga_video_font_height = 8;
+ vga_video_port_reg = console_resource->start + 0x0; /* 0x3d4 */
+ vga_video_port_val = console_resource->start + 0x1; /* 0x3d5 */
}
}

- vga_vram_base = VGA_MAP_MEM(vga_vram_base);
- vga_vram_end = VGA_MAP_MEM(vga_vram_end);
+ console_mem_resource.start = vga_vram_base;
+ console_mem_resource.end = vga_vram_end - 1;
+ pci_request_legacy_resource(NULL, &console_mem_resource);
+ vram_size = vga_vram_end - vga_vram_base;
+ vga_vram_base = (unsigned long)ioremap(console_mem_resource.start,
+ vram_size);
+ vga_vram_end = vga_vram_base + vram_size;

/*
* Find out if there is a graphics card present.
@@ -697,10 +717,10 @@ static int vgacon_blank(struct vc_data *

#ifdef CAN_LOAD_EGA_FONTS

-#define colourmap 0xa0000
+#define colourmap (vga_vram_base & ~0x1ffffUL) /* 0xa0000 */
/* Pauline Middelink <middelin@polyware.iaf.nl> reports that we
should use 0xA0000 for the bwmap as well.. */
-#define blackwmap 0xa0000
+#define blackwmap (vga_vram_base & ~0x1ffffUL) /* 0xa0000 */
#define cmapsz 8192

static int
@@ -713,14 +733,14 @@ vgacon_do_font_op(char *arg, int set, in
int font_select = 0x00;

if (vga_video_type != VIDEO_TYPE_EGAM) {
- charmap = (char *)VGA_MAP_MEM(colourmap);
+ charmap = (char *)(colourmap);
beg = 0x0e;
#ifdef VGA_CAN_DO_64KB
if (vga_video_type == VIDEO_TYPE_VGAC)
beg = 0x06;
#endif
} else {
- charmap = (char *)VGA_MAP_MEM(blackwmap);
+ charmap = (char *)(blackwmap);
beg = 0x0a;
}

diff -urpN 2.5.59/include/linux/pci.h linux/include/linux/pci.h
--- 2.5.59/include/linux/pci.h Fri Jan 17 05:22:08 2003
+++ linux/include/linux/pci.h Tue Jan 28 15:53:02 2003
@@ -677,6 +677,17 @@ extern struct pci_dev *isa_bridge;

#include <asm/pci.h>

+#ifndef __HAVE_ARCH_LEGACY_REMAP
+/* Default for architectures with a single I/O address space. */
+static inline int
+pci_request_legacy_resource(struct pci_bus *bus, struct resource *res)
+{
+ struct resource *root = res->flags & IORESOURCE_IO ?
+ &ioport_resource : &iomem_resource;
+ return request_resource(root, res);
+}
+#endif
+
/*
* If the system does not have PCI, clearly these return errors. Define
* these as simple inline functions to avoid hair in drivers.
-
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