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path: root/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/core/subdev/i2c/base.c')
-rw-r--r--drivers/gpu/drm/nouveau/core/subdev/i2c/base.c394
1 files changed, 394 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c b/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c
new file mode 100644
index 00000000000..71e93615834
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c
@@ -0,0 +1,394 @@
+/*
+ * Copyright 2009 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 <linux/module.h>
+
+#include "drmP.h"
+#include "nouveau_drv.h"
+#include <subdev/i2c.h>
+#include "nouveau_hw.h"
+
+static void
+i2c_drive_scl(void *data, int state)
+{
+ struct nouveau_i2c_chan *port = data;
+ if (port->type == 0) {
+ u8 val = NVReadVgaCrtc(port->dev, 0, port->drive);
+ if (state) val |= 0x20;
+ else val &= 0xdf;
+ NVWriteVgaCrtc(port->dev, 0, port->drive, val | 0x01);
+ } else
+ if (port->type == 4) {
+ nv_mask(port->dev, port->drive, 0x2f, state ? 0x21 : 0x01);
+ } else
+ if (port->type == 5) {
+ if (state) port->state |= 0x01;
+ else port->state &= 0xfe;
+ nv_wr32(port->dev, port->drive, 4 | port->state);
+ }
+}
+
+static void
+i2c_drive_sda(void *data, int state)
+{
+ struct nouveau_i2c_chan *port = data;
+ if (port->type == 0) {
+ u8 val = NVReadVgaCrtc(port->dev, 0, port->drive);
+ if (state) val |= 0x10;
+ else val &= 0xef;
+ NVWriteVgaCrtc(port->dev, 0, port->drive, val | 0x01);
+ } else
+ if (port->type == 4) {
+ nv_mask(port->dev, port->drive, 0x1f, state ? 0x11 : 0x01);
+ } else
+ if (port->type == 5) {
+ if (state) port->state |= 0x02;
+ else port->state &= 0xfd;
+ nv_wr32(port->dev, port->drive, 4 | port->state);
+ }
+}
+
+static int
+i2c_sense_scl(void *data)
+{
+ struct nouveau_i2c_chan *port = data;
+ struct drm_nouveau_private *dev_priv = port->dev->dev_private;
+ if (port->type == 0) {
+ return !!(NVReadVgaCrtc(port->dev, 0, port->sense) & 0x04);
+ } else
+ if (port->type == 4) {
+ return !!(nv_rd32(port->dev, port->sense) & 0x00040000);
+ } else
+ if (port->type == 5) {
+ if (dev_priv->card_type < NV_D0)
+ return !!(nv_rd32(port->dev, port->sense) & 0x01);
+ else
+ return !!(nv_rd32(port->dev, port->sense) & 0x10);
+ }
+ return 0;
+}
+
+static int
+i2c_sense_sda(void *data)
+{
+ struct nouveau_i2c_chan *port = data;
+ struct drm_nouveau_private *dev_priv = port->dev->dev_private;
+ if (port->type == 0) {
+ return !!(NVReadVgaCrtc(port->dev, 0, port->sense) & 0x08);
+ } else
+ if (port->type == 4) {
+ return !!(nv_rd32(port->dev, port->sense) & 0x00080000);
+ } else
+ if (port->type == 5) {
+ if (dev_priv->card_type < NV_D0)
+ return !!(nv_rd32(port->dev, port->sense) & 0x02);
+ else
+ return !!(nv_rd32(port->dev, port->sense) & 0x20);
+ }
+ return 0;
+}
+
+static const uint32_t nv50_i2c_port[] = {
+ 0x00e138, 0x00e150, 0x00e168, 0x00e180,
+ 0x00e254, 0x00e274, 0x00e764, 0x00e780,
+ 0x00e79c, 0x00e7b8
+};
+
+static u8 *
+i2c_table(struct drm_device *dev, u8 *version)
+{
+ u8 *dcb = dcb_table(dev), *i2c = NULL;
+ if (dcb) {
+ if (dcb[0] >= 0x15)
+ i2c = ROMPTR(dev, dcb[2]);
+ if (dcb[0] >= 0x30)
+ i2c = ROMPTR(dev, dcb[4]);
+ }
+
+ /* early revisions had no version number, use dcb version */
+ if (i2c) {
+ *version = dcb[0];
+ if (*version >= 0x30)
+ *version = i2c[0];
+ }
+
+ return i2c;
+}
+
+int
+nouveau_i2c_init(struct drm_device *dev)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nvbios *bios = &dev_priv->vbios;
+ struct nouveau_i2c_chan *port;
+ u8 version = 0x00, entries, recordlen;
+ u8 *i2c, *entry, legacy[2][4] = {};
+ int ret, i;
+
+ INIT_LIST_HEAD(&dev_priv->i2c_ports);
+
+ i2c = i2c_table(dev, &version);
+ if (!i2c) {
+ u8 *bmp = &bios->data[bios->offset];
+ if (bios->type != NVBIOS_BMP)
+ return -ENODEV;
+
+ legacy[0][0] = NV_CIO_CRE_DDC_WR__INDEX;
+ legacy[0][1] = NV_CIO_CRE_DDC_STATUS__INDEX;
+ legacy[1][0] = NV_CIO_CRE_DDC0_WR__INDEX;
+ legacy[1][1] = NV_CIO_CRE_DDC0_STATUS__INDEX;
+
+ /* BMP (from v4.0) has i2c info in the structure, it's in a
+ * fixed location on earlier VBIOS
+ */
+ if (bmp[5] < 4)
+ i2c = &bios->data[0x48];
+ else
+ i2c = &bmp[0x36];
+
+ if (i2c[4]) legacy[0][0] = i2c[4];
+ if (i2c[5]) legacy[0][1] = i2c[5];
+ if (i2c[6]) legacy[1][0] = i2c[6];
+ if (i2c[7]) legacy[1][1] = i2c[7];
+ }
+
+ if (version >= 0x30) {
+ entry = i2c[1] + i2c;
+ entries = i2c[2];
+ recordlen = i2c[3];
+ } else
+ if (version) {
+ entry = i2c;
+ entries = 16;
+ recordlen = 4;
+ } else {
+ entry = legacy[0];
+ entries = 2;
+ recordlen = 4;
+ }
+
+ for (i = 0; i < entries; i++, entry += recordlen) {
+ port = kzalloc(sizeof(*port), GFP_KERNEL);
+ if (port == NULL) {
+ nouveau_i2c_fini(dev);
+ return -ENOMEM;
+ }
+
+ port->type = entry[3];
+ if (version < 0x30) {
+ port->type &= 0x07;
+ if (port->type == 0x07)
+ port->type = 0xff;
+ }
+
+ if (port->type == 0xff) {
+ kfree(port);
+ continue;
+ }
+
+ switch (port->type) {
+ case 0: /* NV04:NV50 */
+ port->drive = entry[0];
+ port->sense = entry[1];
+ break;
+ case 4: /* NV4E */
+ port->drive = 0x600800 + entry[1];
+ port->sense = port->drive;
+ break;
+ case 5: /* NV50- */
+ port->drive = entry[0] & 0x0f;
+ if (dev_priv->card_type < NV_D0) {
+ if (port->drive >= ARRAY_SIZE(nv50_i2c_port))
+ break;
+ port->drive = nv50_i2c_port[port->drive];
+ port->sense = port->drive;
+ } else {
+ port->drive = 0x00d014 + (port->drive * 0x20);
+ port->sense = port->drive;
+ }
+ break;
+ case 6: /* NV50- DP AUX */
+ port->drive = entry[0] & 0x0f;
+ port->sense = port->drive;
+ port->adapter.algo = &nouveau_dp_i2c_algo;
+ break;
+ default:
+ break;
+ }
+
+ if (!port->adapter.algo && !port->drive) {
+ NV_ERROR(dev, "I2C%d: type %d index %x/%x unknown\n",
+ i, port->type, port->drive, port->sense);
+ kfree(port);
+ continue;
+ }
+
+ snprintf(port->adapter.name, sizeof(port->adapter.name),
+ "nouveau-%s-%d", pci_name(dev->pdev), i);
+ port->adapter.owner = THIS_MODULE;
+ port->adapter.dev.parent = &dev->pdev->dev;
+ port->dev = dev;
+ port->index = i;
+ port->dcb = ROM32(entry[0]);
+ i2c_set_adapdata(&port->adapter, i2c);
+
+ if (port->adapter.algo != &nouveau_dp_i2c_algo) {
+ port->adapter.algo_data = &port->bit;
+ port->bit.udelay = 10;
+ port->bit.timeout = usecs_to_jiffies(2200);
+ port->bit.data = port;
+ port->bit.setsda = i2c_drive_sda;
+ port->bit.setscl = i2c_drive_scl;
+ port->bit.getsda = i2c_sense_sda;
+ port->bit.getscl = i2c_sense_scl;
+
+ i2c_drive_scl(port, 0);
+ i2c_drive_sda(port, 1);
+ i2c_drive_scl(port, 1);
+
+ ret = i2c_bit_add_bus(&port->adapter);
+ } else {
+ port->adapter.algo = &nouveau_dp_i2c_algo;
+ ret = i2c_add_adapter(&port->adapter);
+ }
+
+ if (ret) {
+ NV_ERROR(dev, "I2C%d: failed register: %d\n", i, ret);
+ kfree(port);
+ continue;
+ }
+
+ list_add_tail(&port->head, &dev_priv->i2c_ports);
+ }
+
+ return 0;
+}
+
+void
+nouveau_i2c_fini(struct drm_device *dev)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_i2c_chan *port, *tmp;
+
+ list_for_each_entry_safe(port, tmp, &dev_priv->i2c_ports, head) {
+ i2c_del_adapter(&port->adapter);
+ kfree(port);
+ }
+}
+
+struct nouveau_i2c_chan *
+nouveau_i2c_find(struct drm_device *dev, u8 index)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_i2c_chan *port;
+
+ if (index == NV_I2C_DEFAULT(0) ||
+ index == NV_I2C_DEFAULT(1)) {
+ u8 version, *i2c = i2c_table(dev, &version);
+ if (i2c && version >= 0x30) {
+ if (index == NV_I2C_DEFAULT(0))
+ index = (i2c[4] & 0x0f);
+ else
+ index = (i2c[4] & 0xf0) >> 4;
+ } else {
+ index = 2;
+ }
+ }
+
+ list_for_each_entry(port, &dev_priv->i2c_ports, head) {
+ if (port->index == index)
+ break;
+ }
+
+ if (&port->head == &dev_priv->i2c_ports)
+ return NULL;
+
+ if (dev_priv->card_type >= NV_50 && (port->dcb & 0x00000100)) {
+ u32 reg = 0x00e500, val;
+ if (port->type == 6) {
+ reg += port->drive * 0x50;
+ val = 0x2002;
+ } else {
+ reg += ((port->dcb & 0x1e00) >> 9) * 0x50;
+ val = 0xe001;
+ }
+
+ /* nfi, but neither auxch or i2c work if it's 1 */
+ nv_mask(dev, reg + 0x0c, 0x00000001, 0x00000000);
+ /* nfi, but switches auxch vs normal i2c */
+ nv_mask(dev, reg + 0x00, 0x0000f003, val);
+ }
+
+ return port;
+}
+
+bool
+nouveau_probe_i2c_addr(struct nouveau_i2c_chan *i2c, int addr)
+{
+ uint8_t buf[] = { 0 };
+ struct i2c_msg msgs[] = {
+ {
+ .addr = addr,
+ .flags = 0,
+ .len = 1,
+ .buf = buf,
+ },
+ {
+ .addr = addr,
+ .flags = I2C_M_RD,
+ .len = 1,
+ .buf = buf,
+ }
+ };
+
+ return i2c_transfer(&i2c->adapter, msgs, 2) == 2;
+}
+
+int
+nouveau_i2c_identify(struct drm_device *dev, const char *what,
+ struct i2c_board_info *info,
+ bool (*match)(struct nouveau_i2c_chan *,
+ struct i2c_board_info *),
+ int index)
+{
+ struct nouveau_i2c_chan *i2c = nouveau_i2c_find(dev, index);
+ int i;
+
+ if (!i2c) {
+ NV_DEBUG(dev, "No bus when probing %s on %d\n", what, index);
+ return -ENODEV;
+ }
+
+ NV_DEBUG(dev, "Probing %ss on I2C bus: %d\n", what, i2c->index);
+ for (i = 0; info[i].addr; i++) {
+ if (nouveau_probe_i2c_addr(i2c, info[i].addr) &&
+ (!match || match(i2c, &info[i]))) {
+ NV_INFO(dev, "Detected %s: %s\n", what, info[i].type);
+ return i;
+ }
+ }
+
+ NV_DEBUG(dev, "No devices found.\n");
+ return -ENODEV;
+}
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