add gpio bitbanging i2c adapter on LPC device of atom e6xx
gpu chipset to access lvds EDID
tested on SECO QuadMo747-E6xx-EXTREME Qseven platform
Cc: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
Signed-off-by: Jan Safrata <jan.nikitenko@xxxxxxxxx>
---
drivers/gpu/drm/gma500/Makefile | 1 +
drivers/gpu/drm/gma500/oaktrail_lvds.c | 31 ++++--
drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c | 170 +++++++++++++++++++++++++++++
drivers/gpu/drm/gma500/psb_drv.c | 20 ++++
drivers/gpu/drm/gma500/psb_drv.h | 3 +
drivers/gpu/drm/gma500/psb_intel_drv.h | 1 +
6 files changed, 214 insertions(+), 12 deletions(-)
create mode 100644 drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c
diff --git a/drivers/gpu/drm/gma500/Makefile b/drivers/gpu/drm/gma500/Makefile
index b153155..190e55f 100644
--- a/drivers/gpu/drm/gma500/Makefile
+++ b/drivers/gpu/drm/gma500/Makefile
@@ -39,6 +39,7 @@ gma500_gfx-$(CONFIG_DRM_GMA3600) += cdv_device.o \
gma500_gfx-$(CONFIG_DRM_GMA600) += oaktrail_device.o \
oaktrail_crtc.o \
oaktrail_lvds.o \
+ oaktrail_lvds_i2c.o \
oaktrail_hdmi.o \
oaktrail_hdmi_i2c.o
diff --git a/drivers/gpu/drm/gma500/oaktrail_lvds.c b/drivers/gpu/drm/gma500/oaktrail_lvds.c
index 0d39da6..83bbc27 100644
--- a/drivers/gpu/drm/gma500/oaktrail_lvds.c
+++ b/drivers/gpu/drm/gma500/oaktrail_lvds.c
@@ -359,22 +359,26 @@ void oaktrail_lvds_init(struct drm_device *dev,
* if closed, act like it's not there for now
*/
+ edid = NULL;
mutex_lock(&dev->mode_config.mutex);
i2c_adap = i2c_get_adapter(dev_priv->ops->i2c_bus);
- if (i2c_adap == NULL)
- dev_err(dev->dev, "No ddc adapter available!\n");
+ if (i2c_adap)
+ edid = drm_get_edid(connector, i2c_adap);
+ if (edid == NULL && dev_priv->lpc_gpio_base) {
+ oaktrail_lvds_i2c_init(encoder);
+ if (gma_encoder->ddc_bus != NULL) {
+ i2c_adap = &gma_encoder->ddc_bus->adapter;
+ edid = drm_get_edid(connector, i2c_adap);
+ }
+ }
/*
* Attempt to get the fixed panel mode from DDC. Assume that the
* preferred mode is the right one.
*/
- if (i2c_adap) {
- edid = drm_get_edid(connector, i2c_adap);
- if (edid) {
- drm_mode_connector_update_edid_property(connector,
- edid);
- drm_add_edid_modes(connector, edid);
- kfree(edid);
- }
+ if (edid) {
+ drm_mode_connector_update_edid_property(connector, edid);
+ drm_add_edid_modes(connector, edid);
+ kfree(edid);
list_for_each_entry(scan, &connector->probed_modes, head) {
if (scan->type & DRM_MODE_TYPE_PREFERRED) {
@@ -383,7 +387,8 @@ void oaktrail_lvds_init(struct drm_device *dev,
goto out; /* FIXME: check for quirks */
}
}
- }
+ } else
+ dev_err(dev->dev, "No ddc adapter available!\n");
/*
* If we didn't get EDID, try geting panel timing
* from configuration data
@@ -411,8 +416,10 @@ failed_find:
mutex_unlock(&dev->mode_config.mutex);
dev_dbg(dev->dev, "No LVDS modes found, disabling.\n");
- if (gma_encoder->ddc_bus)
+ if (gma_encoder->ddc_bus) {
psb_intel_i2c_destroy(gma_encoder->ddc_bus);
+ gma_encoder->ddc_bus = NULL;
+ }
/* failed_ddc: */
diff --git a/drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c b/drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c
new file mode 100644
index 0000000..f913a62
--- /dev/null
+++ b/drivers/gpu/drm/gma500/oaktrail_lvds_i2c.c
@@ -0,0 +1,170 @@
+/*
+ * Copyright (c) 2002-2010, Intel Corporation.
+ * Copyright (c) 2014 ATRON electronic GmbH
+ * Author: Jan Safrata <jan.nikitenko@xxxxxxxxx>
+ *
+ * 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
+ * AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+
+#include <drm/drmP.h>
+#include "psb_drv.h"
+#include "psb_intel_reg.h"
+
+
+/*
+ * LPC GPIO based I2C bus for LVDS of Atom E6xx
+ */
+
+/*-----------------------------------------------------------------------------
+ * LPC Register Offsets. Used for LVDS GPIO Bit Bashing. Registers are part
+ * Atom E6xx [D31:F0]
+ ----------------------------------------------------------------------------*/
+#define RGEN 0x20
+#define RGIO 0x24
+#define RGLVL 0x28
+#define RGTPE 0x2C
+#define RGTNE 0x30
+#define RGGPE 0x34
+#define RGSMI 0x38
+#define RGTS 0x3C
+
+/* The LVDS GPIO clock lines are GPIOSUS[3]
+ * The LVDS GPIO data lines are GPIOSUS[4]
+ */
+#define GPIO_CLOCK 0x08
+#define GPIO_DATA 0x10
+
+#define LPC_READ_REG(chan, r) inl((chan)->reg + (r))
+#define LPC_WRITE_REG(chan, r, val) outl((val), (chan)->reg + (r))
+
+static int get_clock(void *data)
+{
+ struct psb_intel_i2c_chan *chan = data;
+ u32 val, tmp;
+
+ val = LPC_READ_REG(chan, RGIO);
+ val |= GPIO_CLOCK;
+ LPC_WRITE_REG(chan, RGIO, val);
+ tmp = LPC_READ_REG(chan, RGLVL);
+ val = (LPC_READ_REG(chan, RGLVL) & GPIO_CLOCK) ? 1 : 0;
+
+ return val;
+}
+
+static int get_data(void *data)
+{
+ struct psb_intel_i2c_chan *chan = data;
+ u32 val, tmp;
+
+ val = LPC_READ_REG(chan, RGIO);
+ val |= GPIO_DATA;
+ LPC_WRITE_REG(chan, RGIO, val);
+ tmp = LPC_READ_REG(chan, RGLVL);
+ val = (LPC_READ_REG(chan, RGLVL) & GPIO_DATA) ? 1 : 0;
+
+ return val;
+}
+
+static void set_clock(void *data, int state_high)
+{
+ struct psb_intel_i2c_chan *chan = data;
+ u32 val;
+
+ if (state_high) {
+ val = LPC_READ_REG(chan, RGIO);
+ val |= GPIO_CLOCK;
+ LPC_WRITE_REG(chan, RGIO, val);
+ } else {
+ val = LPC_READ_REG(chan, RGIO);
+ val &= ~GPIO_CLOCK;
+ LPC_WRITE_REG(chan, RGIO, val);
+ val = LPC_READ_REG(chan, RGLVL);
+ val &= ~GPIO_CLOCK;
+ LPC_WRITE_REG(chan, RGLVL, val);
+ }
+}
+
+static void set_data(void *data, int state_high)
+{
+ struct psb_intel_i2c_chan *chan = data;
+ u32 val;
+
+ if (state_high) {
+ val = LPC_READ_REG(chan, RGIO);
+ val |= GPIO_DATA;
+ LPC_WRITE_REG(chan, RGIO, val);
+ } else {
+ val = LPC_READ_REG(chan, RGIO);
+ val &= ~GPIO_DATA;
+ LPC_WRITE_REG(chan, RGIO, val);
+ val = LPC_READ_REG(chan, RGLVL);
+ val &= ~GPIO_DATA;
+ LPC_WRITE_REG(chan, RGLVL, val);
+ }
+}
+
+void oaktrail_lvds_i2c_init(struct drm_encoder *encoder)
+{
+ struct drm_device *dev = encoder->dev;
+ struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
+ struct drm_psb_private *dev_priv = dev->dev_private;
+ struct psb_intel_i2c_chan *chan;
+
+ chan = kzalloc(sizeof(struct psb_intel_i2c_chan), GFP_KERNEL);
+ if (!chan)
+ return;
+
+ chan->drm_dev = dev;
+ chan->reg = dev_priv->lpc_gpio_base;
+ strncpy(chan->adapter.name, "gma500 LPC", I2C_NAME_SIZE - 1);
+ 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 = 100;
+ chan->algo.timeout = usecs_to_jiffies(2200);
+ chan->algo.data = chan;
+
+ i2c_set_adapdata(&chan->adapter, chan);
+
+ set_data(chan, 1);
+ set_clock(chan, 1);
+ udelay(50);
+
+ if (i2c_bit_add_bus(&chan->adapter)) {
+ kfree(chan);
+ return;
+ }
+
+ gma_encoder->ddc_bus = chan;
+}
diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c
index eec993f..3aec0de 100644
--- a/drivers/gpu/drm/gma500/psb_drv.c
+++ b/drivers/gpu/drm/gma500/psb_drv.c
@@ -212,6 +212,8 @@ static int psb_driver_unload(struct drm_device *dev)
}
if (dev_priv->aux_pdev)
pci_dev_put(dev_priv->aux_pdev);
+ if (dev_priv->lpc_pdev)
+ pci_dev_put(dev_priv->lpc_pdev);
/* Destroy VBT data */
psb_intel_destroy_bios(dev);
@@ -280,6 +282,24 @@ static int psb_driver_load(struct drm_device *dev, unsigned long flags)
DRM_DEBUG_KMS("Couldn't find aux pci device");
}
dev_priv->gmbus_reg = dev_priv->aux_reg;
+
+ dev_priv->lpc_pdev = pci_get_bus_and_slot(0, PCI_DEVFN(31, 0));
+ if (dev_priv->lpc_pdev) {
+ pci_read_config_word(dev_priv->lpc_pdev, PSB_LPC_GBA,
+ &dev_priv->lpc_gpio_base);
+ pci_write_config_dword(dev_priv->lpc_pdev, PSB_LPC_GBA,
+ (u32)dev_priv->lpc_gpio_base | (1L<<31));
+ pci_read_config_word(dev_priv->lpc_pdev, PSB_LPC_GBA,
+ &dev_priv->lpc_gpio_base);
+ dev_priv->lpc_gpio_base &= 0xffc0;
+ if (dev_priv->lpc_gpio_base)
+ DRM_DEBUG_KMS("Found LPC GPIO at 0x%04x\n",
+ dev_priv->lpc_gpio_base);
+ else {
+ pci_dev_put(dev_priv->lpc_pdev);
+ dev_priv->lpc_pdev = NULL;
+ }
+ }
} else {
dev_priv->gmbus_reg = dev_priv->vdc_reg;
}
diff --git a/drivers/gpu/drm/gma500/psb_drv.h b/drivers/gpu/drm/gma500/psb_drv.h
index 55ebe2b..e38057b 100644
--- a/drivers/gpu/drm/gma500/psb_drv.h
+++ b/drivers/gpu/drm/gma500/psb_drv.h
@@ -83,6 +83,7 @@ enum {
#define PSB_PGETBL_CTL 0x2020
#define _PSB_PGETBL_ENABLED 0x00000001
#define PSB_SGX_2D_SLAVE_PORT 0x4000
+#define PSB_LPC_GBA 0x44
/* TODO: To get rid of */
#define PSB_TT_PRIV0_LIMIT (256*1024*1024)
@@ -441,6 +442,7 @@ struct psb_ops;
struct drm_psb_private {
struct drm_device *dev;
struct pci_dev *aux_pdev; /* Currently only used by mrst */
+ struct pci_dev *lpc_pdev; /* Currently only used by mrst */
const struct psb_ops *ops;
const struct psb_offset *regmap;
@@ -470,6 +472,7 @@ struct drm_psb_private {
uint8_t __iomem *sgx_reg;
uint8_t __iomem *vdc_reg;
uint8_t __iomem *aux_reg; /* Auxillary vdc pipe regs */
+ uint16_t lpc_gpio_base;
uint32_t gatt_free_offset;
/* Fencing / irq */
diff --git a/drivers/gpu/drm/gma500/psb_intel_drv.h b/drivers/gpu/drm/gma500/psb_intel_drv.h
index 336bd3a..860dd21 100644
--- a/drivers/gpu/drm/gma500/psb_intel_drv.h
+++ b/drivers/gpu/drm/gma500/psb_intel_drv.h
@@ -223,6 +223,7 @@ extern void oaktrail_lvds_init(struct drm_device *dev,
extern void oaktrail_wait_for_INTR_PKT_SENT(struct drm_device *dev);
extern void oaktrail_dsi_init(struct drm_device *dev,
struct psb_intel_mode_device *mode_dev);
+extern void oaktrail_lvds_i2c_init(struct drm_encoder *encoder);
extern void mid_dsi_init(struct drm_device *dev,
struct psb_intel_mode_device *mode_dev, int dsi_num);
--
1.8.5.5
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