Dynamically generate PNP0C02 mainboard resources in SSDT

Updated patch with improved comments and small bugfix (use same
value for min and max on io resource).

While adding the area between TOM1 and 4GB to \SB.PCI0._CRS seems to be the
easiest way to get both Linux and Windows happy, it is not quite correct
because reserved areas like APIC, MMCONF etc. ranges need to be excluded.

This is a proof of concept patch for the M2V board that dynamically creates a
ResourceTemplate() containing these in the SSDT and adds a corresponding
PNP0C02 device to the DSDT.

All resources that have IORESOURCE_RESERVE and (IORESOURCE_MEM or IORESOURCE_IO) set
are added.

Signed-off-by: Tobias Diedrich <ranma+coreboot@tdiedrich.de>

Added M2V-MX SE too.
Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Acked-by: Rudolf Marek <r.marek@assembler.cz>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6084 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

2 files changed, 149 insertions, 0 deletions

diff --git a/src/arch/i386/boot/acpigen.c b/src/arch/i386/boot/acpigen.c
index 2bd2ab5630..e8cd724e23 100644
--- a/src/arch/i386/boot/acpigen.c
+++ b/src/arch/i386/boot/acpigen.c
@@ -28,6 +28,7 @@
 #include <string.h>
 #include <arch/acpigen.h>
 #include <console/console.h>
+#include <device/device.h>
 
 static char *gencurrent;
 
@@ -372,3 +373,145 @@ int acpigen_write_PSD_package(u32 domain, u32 numprocs, PSD_coord coordtype)
 	acpigen_patch_len(len - 1);
 	return len + lenh;
 }
+
+int acpigen_write_mem32fixed(int readwrite, u32 base, u32 size)
+{
+	/*
+	 * acpi 4.0 section 6.4.3.4: 32-Bit Fixed Memory Range Descriptor
+	 * Byte 0:
+	 *   Bit7  : 1 => big item
+	 *   Bit6-0: 0000110 (0x6) => 32-bit fixed memory
+	 */
+	acpigen_emit_byte(0x86);
+	/* Byte 1+2: length (0x0009) */
+	acpigen_emit_byte(0x09);
+	acpigen_emit_byte(0x00);
+	/* bit1-7 are ignored */
+	acpigen_emit_byte(readwrite ? 0x01 : 0x00);
+	acpigen_emit_byte(base & 0xff);
+	acpigen_emit_byte((base >> 8) & 0xff);
+	acpigen_emit_byte((base >> 16) & 0xff);
+	acpigen_emit_byte((base >> 24) & 0xff);
+	acpigen_emit_byte(size & 0xff);
+	acpigen_emit_byte((size >> 8) & 0xff);
+	acpigen_emit_byte((size >> 16) & 0xff);
+	acpigen_emit_byte((size >> 24) & 0xff);
+	return 12;
+}
+
+int acpigen_write_io16(u16 min, u16 max, u8 align, u8 len, u8 decode16)
+{
+	/*
+	 * acpi 4.0 section 6.4.2.6: I/O Port Descriptor
+	 * Byte 0:
+	 *   Bit7  : 0 => small item
+	 *   Bit6-3: 1000 (0x8) => I/O port descriptor
+	 *   Bit2-0: 111 (0x7) => 7 Bytes long
+	 */
+	acpigen_emit_byte(0x47);
+	/* does the device decode all 16 or just 10 bits? */
+	/* bit1-7 are ignored */
+	acpigen_emit_byte(decode16 ? 0x01 : 0x00);
+	/* minimum base address the device may be configured for */
+	acpigen_emit_byte(min & 0xff);
+	acpigen_emit_byte((min >> 8) & 0xff);
+	/* maximum base address the device may be configured for */
+	acpigen_emit_byte(max & 0xff);
+	acpigen_emit_byte((max >> 8) & 0xff);
+	/* alignment for min base */
+	acpigen_emit_byte(align & 0xff);
+	acpigen_emit_byte(len & 0xff);
+	return 8;
+}
+
+int acpigen_write_resourcetemplate_header(void)
+{
+	int len;
+	/*
+	 * A ResourceTemplate() is a Buffer() with a
+	 * (Byte|Word|DWord) containing the length, followed by one or more
+	 * resource items, terminated by the end tag
+	 * (small item 0xf, len 1)
+	 */
+	len = acpigen_emit_byte(0x11); /* Buffer opcode */
+	len += acpigen_write_len_f();
+	len += acpigen_emit_byte(0x0b); /* Word opcode */
+	len_stack[ltop++] = acpigen_get_current();
+	len += acpigen_emit_byte(0x00);
+	len += acpigen_emit_byte(0x00);
+	return len;
+}
+
+int acpigen_write_resourcetemplate_footer(int len)
+{
+	char *p = len_stack[--ltop];
+	/*
+	 * end tag (acpi 4.0 Section 6.4.2.8)
+	 * 0x79 <checksum>
+	 * 0x00 is treated as a good checksum according to the spec
+	 * and is what iasl generates.
+	 */
+	len += acpigen_emit_byte(0x79);
+	len += acpigen_emit_byte(0x00);
+	/* patch len word */
+	p[0] = (len-6) & 0xff;
+	p[1] = ((len-6) >> 8) & 0xff;
+	/* patch len field */
+	acpigen_patch_len(len-1);
+	return 2;
+}
+
+static void acpigen_add_mainboard_rsvd_mem32(void *gp, struct device *dev,
+						struct resource *res)
+{
+	acpigen_write_mem32fixed(0, res->base, res->size);
+}
+
+static void acpigen_add_mainboard_rsvd_io(void *gp, struct device *dev,
+						struct resource *res)
+{
+	resource_t base = res->base;
+	resource_t size = res->size;
+	while (size > 0) {
+		resource_t sz = size > 255 ? 255 : size;
+		acpigen_write_io16(base, base, 0, sz, 1);
+		size -= sz;
+		base += sz;
+	}
+}
+
+int acpigen_write_mainboard_resource_template(void)
+{
+	int len;
+	char *start;
+	char *end;
+	len = acpigen_write_resourcetemplate_header();
+	start = acpigen_get_current();
+
+	/* Add reserved memory ranges */
+	search_global_resources(
+		IORESOURCE_MEM | IORESOURCE_RESERVE,
+		 IORESOURCE_MEM | IORESOURCE_RESERVE,
+		acpigen_add_mainboard_rsvd_mem32, 0);
+
+	/* Add reserved io ranges */
+	search_global_resources(
+		IORESOURCE_IO | IORESOURCE_RESERVE,
+		 IORESOURCE_IO | IORESOURCE_RESERVE,
+		acpigen_add_mainboard_rsvd_io, 0);
+
+	end = acpigen_get_current();
+	len += end-start;
+	len += acpigen_write_resourcetemplate_footer(len);
+	return len;
+}
+
+int acpigen_write_mainboard_resources(const char *scope, const char *name)
+{
+	int len;
+	len = acpigen_write_scope(scope);
+	len += acpigen_write_name(name);
+	len += acpigen_write_mainboard_resource_template();
+	acpigen_patch_len(len - 1);
+	return len;
+}
diff --git a/src/arch/i386/include/arch/acpigen.h b/src/arch/i386/include/arch/acpigen.h
index 52a48e417c..6f13a7ae1f 100644
--- a/src/arch/i386/include/arch/acpigen.h
+++ b/src/arch/i386/include/arch/acpigen.h
@@ -46,5 +46,11 @@ int acpigen_write_PSS_package(u32 coreFreq, u32 power, u32 transLat, u32 busmLat
 typedef enum { SW_ALL=0xfc, SW_ANY=0xfd, HW_ALL=0xfe } PSD_coord;
 int acpigen_write_PSD_package(u32 domain, u32 numprocs, PSD_coord coordtype);
 int acpigen_write_processor(u8 cpuindex, u32 pblock_addr, u8 pblock_len);
+int acpigen_write_mem32fixed(int readwrite, u32 base, u32 size);
+int acpigen_write_io16(u16 min, u16 max, u8 align, u8 len, u8 decode16);
+int acpigen_write_resourcetemplate_header(void);
+int acpigen_write_resourcetemplate_footer(int len);
+int acpigen_write_mainboard_resource_template(void);
+int acpigen_write_mainboard_resources(const char *scope, const char *name);
 
 #endif