diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_i2c.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_i2c.c | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_i2c.c b/drivers/gpu/drm/nouveau/nouveau_i2c.c new file mode 100644 index 00000000..77e56466 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nouveau_i2c.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 "nouveau_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]; + 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; +} |