mirror of
https://github.com/torvalds/linux.git
synced 2024-12-23 03:11:46 +00:00
f553b79c03
i2c-algo-bit doesn't actually work very well on one card I have access to (NVS 300), random single-bit errors occur most of the time - what we're doing now is closer to what xf86i2c.c does. The original plan was to figure out why i2c-algo-bit fails on the NVS 300, and fix it. However, while investigating I discovered i2c-algo-bit calls cond_resched(), which makes it a bad idea for us to be using as we execute VBIOS scripts from a tasklet, and there may very well be i2c transfers as a result. So, since I already wrote this code in userspace to track down the NVS 300 bug, and it's not really much code - lets use it. Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
552 lines
12 KiB
C
552 lines
12 KiB
C
/*
|
|
* 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"
|
|
|
|
#define T_TIMEOUT 2200000
|
|
#define T_RISEFALL 1000
|
|
#define T_HOLD 5000
|
|
|
|
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 void
|
|
i2c_delay(struct nouveau_i2c_chan *port, u32 nsec)
|
|
{
|
|
udelay((nsec + 500) / 1000);
|
|
}
|
|
|
|
static bool
|
|
i2c_raise_scl(struct nouveau_i2c_chan *port)
|
|
{
|
|
u32 timeout = T_TIMEOUT / T_RISEFALL;
|
|
|
|
i2c_drive_scl(port, 1);
|
|
do {
|
|
i2c_delay(port, T_RISEFALL);
|
|
} while (!i2c_sense_scl(port) && --timeout);
|
|
|
|
return timeout != 0;
|
|
}
|
|
|
|
static int
|
|
i2c_start(struct nouveau_i2c_chan *port)
|
|
{
|
|
int ret = 0;
|
|
|
|
port->state = i2c_sense_scl(port);
|
|
port->state |= i2c_sense_sda(port) << 1;
|
|
if (port->state != 3) {
|
|
i2c_drive_scl(port, 0);
|
|
i2c_drive_sda(port, 1);
|
|
if (!i2c_raise_scl(port))
|
|
ret = -EBUSY;
|
|
}
|
|
|
|
i2c_drive_sda(port, 0);
|
|
i2c_delay(port, T_HOLD);
|
|
i2c_drive_scl(port, 0);
|
|
i2c_delay(port, T_HOLD);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
i2c_stop(struct nouveau_i2c_chan *port)
|
|
{
|
|
i2c_drive_scl(port, 0);
|
|
i2c_drive_sda(port, 0);
|
|
i2c_delay(port, T_RISEFALL);
|
|
|
|
i2c_drive_scl(port, 1);
|
|
i2c_delay(port, T_HOLD);
|
|
i2c_drive_sda(port, 1);
|
|
i2c_delay(port, T_HOLD);
|
|
}
|
|
|
|
static int
|
|
i2c_bitw(struct nouveau_i2c_chan *port, int sda)
|
|
{
|
|
i2c_drive_sda(port, sda);
|
|
i2c_delay(port, T_RISEFALL);
|
|
|
|
if (!i2c_raise_scl(port))
|
|
return -ETIMEDOUT;
|
|
i2c_delay(port, T_HOLD);
|
|
|
|
i2c_drive_scl(port, 0);
|
|
i2c_delay(port, T_HOLD);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
i2c_bitr(struct nouveau_i2c_chan *port)
|
|
{
|
|
int sda;
|
|
|
|
i2c_drive_sda(port, 1);
|
|
i2c_delay(port, T_RISEFALL);
|
|
|
|
if (!i2c_raise_scl(port))
|
|
return -ETIMEDOUT;
|
|
i2c_delay(port, T_HOLD);
|
|
|
|
sda = i2c_sense_sda(port);
|
|
|
|
i2c_drive_scl(port, 0);
|
|
i2c_delay(port, T_HOLD);
|
|
return sda;
|
|
}
|
|
|
|
static int
|
|
i2c_get_byte(struct nouveau_i2c_chan *port, u8 *byte, bool last)
|
|
{
|
|
int i, bit;
|
|
|
|
*byte = 0;
|
|
for (i = 7; i >= 0; i--) {
|
|
bit = i2c_bitr(port);
|
|
if (bit < 0)
|
|
return bit;
|
|
*byte |= bit << i;
|
|
}
|
|
|
|
return i2c_bitw(port, last ? 1 : 0);
|
|
}
|
|
|
|
static int
|
|
i2c_put_byte(struct nouveau_i2c_chan *port, u8 byte)
|
|
{
|
|
int i, ret;
|
|
for (i = 7; i >= 0; i--) {
|
|
ret = i2c_bitw(port, !!(byte & (1 << i)));
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
ret = i2c_bitr(port);
|
|
if (ret == 1) /* nack */
|
|
ret = -EIO;
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
i2c_addr(struct nouveau_i2c_chan *port, struct i2c_msg *msg)
|
|
{
|
|
u32 addr = msg->addr << 1;
|
|
if (msg->flags & I2C_M_RD)
|
|
addr |= 1;
|
|
return i2c_put_byte(port, addr);
|
|
}
|
|
|
|
static int
|
|
i2c_bit_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
|
|
{
|
|
struct nouveau_i2c_chan *port = (struct nouveau_i2c_chan *)adap;
|
|
struct i2c_msg *msg = msgs;
|
|
int ret = 0, mcnt = num;
|
|
|
|
while (!ret && mcnt--) {
|
|
u8 remaining = msg->len;
|
|
u8 *ptr = msg->buf;
|
|
|
|
ret = i2c_start(port);
|
|
if (ret == 0)
|
|
ret = i2c_addr(port, msg);
|
|
|
|
if (msg->flags & I2C_M_RD) {
|
|
while (!ret && remaining--)
|
|
ret = i2c_get_byte(port, ptr++, !remaining);
|
|
} else {
|
|
while (!ret && remaining--)
|
|
ret = i2c_put_byte(port, *ptr++);
|
|
}
|
|
|
|
msg++;
|
|
}
|
|
|
|
i2c_stop(port);
|
|
return (ret < 0) ? ret : num;
|
|
}
|
|
|
|
static u32
|
|
i2c_bit_func(struct i2c_adapter *adap)
|
|
{
|
|
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
|
|
}
|
|
|
|
const struct i2c_algorithm i2c_bit_algo = {
|
|
.master_xfer = i2c_bit_xfer,
|
|
.functionality = i2c_bit_func
|
|
};
|
|
|
|
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 *i2c, *entry, legacy[2][4] = {};
|
|
u8 version, entries, recordlen;
|
|
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 (i2c && version >= 0x30) {
|
|
entry = i2c[1] + i2c;
|
|
entries = i2c[2];
|
|
recordlen = i2c[3];
|
|
} else
|
|
if (i2c) {
|
|
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];
|
|
port->adapter.algo = &i2c_bit_algo;
|
|
break;
|
|
case 4: /* NV4E */
|
|
port->drive = 0x600800 + entry[1];
|
|
port->sense = port->drive;
|
|
port->adapter.algo = &i2c_bit_algo;
|
|
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;
|
|
}
|
|
port->adapter.algo = &i2c_bit_algo;
|
|
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) {
|
|
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);
|
|
|
|
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;
|
|
}
|