mgag200: initial g200se driver (v2)

This is a driver for the G200 server engines chips,
it doesn't driver any of the Matrix G series desktop cards.

It will bind to G200 SE A,B, G200EV, G200WB, G200EH and G200ER cards.

Its based on previous work done my Matthew Garrett but remodelled
to follow the same style and flow as the AST server driver. It also
works along the same lines as the AST server driver wrt memory management.

There is no userspace driver planned, xf86-video-modesetting should be used.
It also appears these GPUs have no ARGB hw cursors.

v2: add missing tagfifo reset + G200 SE memory bw setup pieces.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 156 insertions, 0 deletions

diff --git a/drivers/gpu/drm/mgag200/mgag200_i2c.c b/drivers/gpu/drm/mgag200/mgag200_i2c.c
new file mode 100644
index 000000000000..dd3568a1b6b0
--- /dev/null
+++ b/drivers/gpu/drm/mgag200/mgag200_i2c.c
@@ -0,0 +1,156 @@
+/*
+ * 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ */
+/*
+ * Authors: Dave Airlie <airlied@redhat.com>
+ */
+#include <linux/export.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+#include "drmP.h"
+#include "drm.h"
+
+#include "mgag200_drv.h"
+
+static int mga_i2c_read_gpio(struct mga_device *mdev)
+{
+	WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
+	return RREG8(DAC_DATA);
+}
+
+static void mga_i2c_set_gpio(struct mga_device *mdev, int mask, int val)
+{
+	int tmp;
+
+	WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL);
+	tmp = (RREG8(DAC_DATA) & mask) | val;
+	WREG_DAC(MGA1064_GEN_IO_CTL, tmp);
+	WREG_DAC(MGA1064_GEN_IO_DATA, 0);
+}
+
+static inline void mga_i2c_set(struct mga_device *mdev, int mask, int state)
+{
+	if (state)
+		state = 0;
+	else
+		state = mask;
+	mga_i2c_set_gpio(mdev, ~mask, state);
+}
+
+static void mga_gpio_setsda(void *data, int state)
+{
+	struct mga_i2c_chan *i2c = data;
+	struct mga_device *mdev = i2c->dev->dev_private;
+	mga_i2c_set(mdev, i2c->data, state);
+}
+
+static void mga_gpio_setscl(void *data, int state)
+{
+	struct mga_i2c_chan *i2c = data;
+	struct mga_device *mdev = i2c->dev->dev_private;
+	mga_i2c_set(mdev, i2c->clock, state);
+}
+
+static int mga_gpio_getsda(void *data)
+{
+	struct mga_i2c_chan *i2c = data;
+	struct mga_device *mdev = i2c->dev->dev_private;
+	return (mga_i2c_read_gpio(mdev) & i2c->data) ? 1 : 0;
+}
+
+static int mga_gpio_getscl(void *data)
+{
+	struct mga_i2c_chan *i2c = data;
+	struct mga_device *mdev = i2c->dev->dev_private;
+	return (mga_i2c_read_gpio(mdev) & i2c->clock) ? 1 : 0;
+}
+
+struct mga_i2c_chan *mgag200_i2c_create(struct drm_device *dev)
+{
+	struct mga_device *mdev = dev->dev_private;
+	struct mga_i2c_chan *i2c;
+	int ret;
+	int data, clock;
+
+	WREG_DAC(MGA1064_GEN_IO_DATA, 0xff);
+	WREG_DAC(MGA1064_GEN_IO_CTL, 0);
+
+	switch (mdev->type) {
+	case G200_SE_A:
+	case G200_SE_B:
+	case G200_EV:
+	case G200_WB:
+		data = 1;
+		clock = 2;
+		break;
+	case G200_EH:
+	case G200_ER:
+		data = 2;
+		clock = 1;
+		break;
+	default:
+		data = 2;
+		clock = 8;
+		break;
+	}
+
+	i2c = kzalloc(sizeof(struct mga_i2c_chan), GFP_KERNEL);
+	if (!i2c)
+		return NULL;
+
+	i2c->data = data;
+	i2c->clock = clock;
+	i2c->adapter.owner = THIS_MODULE;
+	i2c->adapter.class = I2C_CLASS_DDC;
+	i2c->adapter.dev.parent = &dev->pdev->dev;
+	i2c->dev = dev;
+	i2c_set_adapdata(&i2c->adapter, i2c);
+	snprintf(i2c->adapter.name, sizeof(i2c->adapter.name), "mga i2c");
+
+	i2c->adapter.algo_data = &i2c->bit;
+
+	i2c->bit.udelay = 10;
+	i2c->bit.timeout = 2;
+	i2c->bit.data = i2c;
+	i2c->bit.setsda		= mga_gpio_setsda;
+	i2c->bit.setscl		= mga_gpio_setscl;
+	i2c->bit.getsda		= mga_gpio_getsda;
+	i2c->bit.getscl		= mga_gpio_getscl;
+
+	ret = i2c_bit_add_bus(&i2c->adapter);
+	if (ret) {
+		kfree(i2c);
+		i2c = NULL;
+	}
+	return i2c;
+}
+
+void mgag200_i2c_destroy(struct mga_i2c_chan *i2c)
+{
+	if (!i2c)
+		return;
+	i2c_del_adapter(&i2c->adapter);
+	kfree(i2c);
+}
+