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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/gpu/drm/mgag200/mgag200_i2c.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/gpu/drm/mgag200/mgag200_i2c.c')
-rw-r--r--kernel/drivers/gpu/drm/mgag200/mgag200_i2c.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/kernel/drivers/gpu/drm/mgag200/mgag200_i2c.c b/kernel/drivers/gpu/drm/mgag200/mgag200_i2c.c
new file mode 100644
index 000000000..d3dcf54e6
--- /dev/null
+++ b/kernel/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 <drm/drmP.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_CTL2, 1);
+ 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);
+}
+