summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/gma500/intel_i2c.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /drivers/gpu/drm/gma500/intel_i2c.c
parentInitial commit. (diff)
downloadlinux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz
linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip
Adding upstream version 5.10.209.upstream/5.10.209
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/gma500/intel_i2c.c')
-rw-r--r--drivers/gpu/drm/gma500/intel_i2c.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gma500/intel_i2c.c b/drivers/gpu/drm/gma500/intel_i2c.c
new file mode 100644
index 000000000..de8810188
--- /dev/null
+++ b/drivers/gpu/drm/gma500/intel_i2c.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright © 2006-2007 Intel Corporation
+ *
+ * Authors:
+ * Eric Anholt <eric@anholt.net>
+ */
+
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/i2c-algo-bit.h>
+#include <linux/i2c.h>
+
+#include "psb_drv.h"
+#include "psb_intel_reg.h"
+
+/*
+ * Intel GPIO access functions
+ */
+
+#define I2C_RISEFALL_TIME 20
+
+static int get_clock(void *data)
+{
+ struct psb_intel_i2c_chan *chan = data;
+ struct drm_device *dev = chan->drm_dev;
+ u32 val;
+
+ val = REG_READ(chan->reg);
+ return (val & GPIO_CLOCK_VAL_IN) != 0;
+}
+
+static int get_data(void *data)
+{
+ struct psb_intel_i2c_chan *chan = data;
+ struct drm_device *dev = chan->drm_dev;
+ u32 val;
+
+ val = REG_READ(chan->reg);
+ return (val & GPIO_DATA_VAL_IN) != 0;
+}
+
+static void set_clock(void *data, int state_high)
+{
+ struct psb_intel_i2c_chan *chan = data;
+ struct drm_device *dev = chan->drm_dev;
+ u32 reserved = 0, clock_bits;
+
+ /* On most chips, these bits must be preserved in software. */
+ reserved =
+ REG_READ(chan->reg) & (GPIO_DATA_PULLUP_DISABLE |
+ GPIO_CLOCK_PULLUP_DISABLE);
+
+ if (state_high)
+ clock_bits = GPIO_CLOCK_DIR_IN | GPIO_CLOCK_DIR_MASK;
+ else
+ clock_bits = GPIO_CLOCK_DIR_OUT | GPIO_CLOCK_DIR_MASK |
+ GPIO_CLOCK_VAL_MASK;
+ REG_WRITE(chan->reg, reserved | clock_bits);
+ udelay(I2C_RISEFALL_TIME); /* wait for the line to change state */
+}
+
+static void set_data(void *data, int state_high)
+{
+ struct psb_intel_i2c_chan *chan = data;
+ struct drm_device *dev = chan->drm_dev;
+ u32 reserved = 0, data_bits;
+
+ /* On most chips, these bits must be preserved in software. */
+ reserved =
+ REG_READ(chan->reg) & (GPIO_DATA_PULLUP_DISABLE |
+ GPIO_CLOCK_PULLUP_DISABLE);
+
+ if (state_high)
+ data_bits = GPIO_DATA_DIR_IN | GPIO_DATA_DIR_MASK;
+ else
+ data_bits =
+ GPIO_DATA_DIR_OUT | GPIO_DATA_DIR_MASK |
+ GPIO_DATA_VAL_MASK;
+
+ REG_WRITE(chan->reg, reserved | data_bits);
+ udelay(I2C_RISEFALL_TIME); /* wait for the line to change state */
+}
+
+/**
+ * psb_intel_i2c_create - instantiate an Intel i2c bus using the specified GPIO reg
+ * @dev: DRM device
+ * @output: driver specific output device
+ * @reg: GPIO reg to use
+ * @name: name for this bus
+ *
+ * Creates and registers a new i2c bus with the Linux i2c layer, for use
+ * in output probing and control (e.g. DDC or SDVO control functions).
+ *
+ * Possible values for @reg include:
+ * %GPIOA
+ * %GPIOB
+ * %GPIOC
+ * %GPIOD
+ * %GPIOE
+ * %GPIOF
+ * %GPIOG
+ * %GPIOH
+ * see PRM for details on how these different busses are used.
+ */
+struct psb_intel_i2c_chan *psb_intel_i2c_create(struct drm_device *dev,
+ const u32 reg, const char *name)
+{
+ struct psb_intel_i2c_chan *chan;
+
+ chan = kzalloc(sizeof(struct psb_intel_i2c_chan), GFP_KERNEL);
+ if (!chan)
+ goto out_free;
+
+ chan->drm_dev = dev;
+ chan->reg = reg;
+ snprintf(chan->adapter.name, I2C_NAME_SIZE, "intel drm %s", name);
+ chan->adapter.owner = THIS_MODULE;
+ chan->adapter.algo_data = &chan->algo;
+ chan->adapter.dev.parent = &dev->pdev->dev;
+ chan->algo.setsda = set_data;
+ chan->algo.setscl = set_clock;
+ chan->algo.getsda = get_data;
+ chan->algo.getscl = get_clock;
+ chan->algo.udelay = 20;
+ chan->algo.timeout = usecs_to_jiffies(2200);
+ chan->algo.data = chan;
+
+ i2c_set_adapdata(&chan->adapter, chan);
+
+ if (i2c_bit_add_bus(&chan->adapter))
+ goto out_free;
+
+ /* JJJ: raise SCL and SDA? */
+ set_data(chan, 1);
+ set_clock(chan, 1);
+ udelay(20);
+
+ return chan;
+
+out_free:
+ kfree(chan);
+ return NULL;
+}
+
+/**
+ * psb_intel_i2c_destroy - unregister and free i2c bus resources
+ * @output: channel to free
+ *
+ * Unregister the adapter from the i2c layer, then free the structure.
+ */
+void psb_intel_i2c_destroy(struct psb_intel_i2c_chan *chan)
+{
+ if (!chan)
+ return;
+
+ i2c_del_adapter(&chan->adapter);
+ kfree(chan);
+}