drm/nouveau/bios: add support for parsing xpio table data

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/Makefile

@@ -40,6 +40,7 @@ nouveau-y += core/subdev/bios/mxm.o
 nouveau-y += core/subdev/bios/perf.o
 nouveau-y += core/subdev/bios/pll.o
 nouveau-y += core/subdev/bios/therm.o
+nouveau-y += core/subdev/bios/xpio.o
 nouveau-y += core/subdev/bus/nv04.o
 nouveau-y += core/subdev/bus/nv31.o
 nouveau-y += core/subdev/bus/nv50.o

drivers/gpu/drm/nouveau/core/include/subdev/bios/gpio.h

 #ifndef __NVBIOS_GPIO_H__
 #define __NVBIOS_GPIO_H__
 
-struct nouveau_bios;
-
 enum dcb_gpio_func_name {
 	DCB_GPIO_PANEL_POWER = 0x01,
 	DCB_GPIO_TVDAC0 = 0x0c,

drivers/gpu/drm/nouveau/core/include/subdev/bios/xpio.h

+#ifndef __NVBIOS_XPIO_H__
+#define __NVBIOS_XPIO_H__
+
+#define NVBIOS_XPIO_FLAG_AUX  0x10
+#define NVBIOS_XPIO_FLAG_AUX0 0x00
+#define NVBIOS_XPIO_FLAG_AUX1 0x10
+
+struct nvbios_xpio {
+	u8 type;
+	u8 addr;
+	u8 flags;
+};
+
+u16 dcb_xpio_table(struct nouveau_bios *, u8 idx,
+		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len);
+u16 dcb_xpio_parse(struct nouveau_bios *, u8 idx,
+		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_xpio *);
+
+#endif

drivers/gpu/drm/nouveau/core/subdev/bios/gpio.c

@@ -25,6 +25,7 @@
 #include <subdev/bios.h>
 #include <subdev/bios/dcb.h>
 #include <subdev/bios/gpio.h>
+#include <subdev/bios/xpio.h>
 
 u16
 dcb_gpio_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
@@ -60,8 +61,14 @@ dcb_gpio_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
 u16
 dcb_gpio_entry(struct nouveau_bios *bios, int idx, int ent, u8 *ver, u8 *len)
 {
-	u8  hdr, cnt;
-	u16 gpio = !idx ? dcb_gpio_table(bios, ver, &hdr, &cnt, len) : 0x0000;
+	u8  hdr, cnt, xver; /* use gpio version for xpio entry parsing */
+	u16 gpio;
+
+	if (!idx--)
+		gpio = dcb_gpio_table(bios, ver, &hdr, &cnt, len);
+	else
+		gpio = dcb_xpio_table(bios, idx, &xver, &hdr, &cnt, len);
+
 	if (gpio && ent < cnt)
 		return gpio + hdr + (ent * *len);
 	return 0x0000;

drivers/gpu/drm/nouveau/core/subdev/bios/xpio.c

+/*
+ * Copyright 2012 Red Hat Inc.
+ *
+ * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ *
+ * Authors: Ben Skeggs
+ */
+
+#include <subdev/bios.h>
+#include <subdev/bios/gpio.h>
+#include <subdev/bios/xpio.h>
+
+static u16
+dcb_xpiod_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
+{
+	u16 data = dcb_gpio_table(bios, ver, hdr, cnt, len);
+	if (data && *ver >= 0x40 && *hdr >= 0x06) {
+		u16 xpio = nv_ro16(bios, data + 0x04);
+		if (xpio) {
+			*ver = nv_ro08(bios, data + 0x00);
+			*hdr = nv_ro08(bios, data + 0x01);
+			*cnt = nv_ro08(bios, data + 0x02);
+			*len = nv_ro08(bios, data + 0x03);
+			return xpio;
+		}
+	}
+	return 0x0000;
+}
+
+u16
+dcb_xpio_table(struct nouveau_bios *bios, u8 idx,
+	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
+{
+	u16 data = dcb_xpiod_table(bios, ver, hdr, cnt, len);
+	if (data && idx < *cnt) {
+		u16 xpio = nv_ro16(bios, data + *hdr + (idx * *len));
+		if (xpio) {
+			*ver = nv_ro08(bios, data + 0x00);
+			*hdr = nv_ro08(bios, data + 0x01);
+			*cnt = nv_ro08(bios, data + 0x02);
+			*len = nv_ro08(bios, data + 0x03);
+			return xpio;
+		}
+	}
+	return 0x0000;
+}
+
+u16
+dcb_xpio_parse(struct nouveau_bios *bios, u8 idx,
+	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+	       struct nvbios_xpio *info)
+{
+	u16 data = dcb_xpio_table(bios, idx, ver, hdr, cnt, len);
+	if (data && *len >= 6) {
+		info->type = nv_ro08(bios, data + 0x04);
+		info->addr = nv_ro08(bios, data + 0x05);
+		info->flags = nv_ro08(bios, data + 0x06);
+	}
+	return 0x0000;
+}