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linux-stable/drivers/i2c/busses/i2c-i801.c
Linus Torvalds 87840a2b7e Merge branch 'i2c/for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 
Pull i2c updates from Wolfram Sang:
 "Here is the 4.9 pull request from I2C including:

   - centralized error messages when registering to the core
   - improved lockdep annotations to prevent false positives
   - DT support for muxes, gates, and arbitrators
   - bus speeds can now be obtained from ACPI
   - i2c-octeon got refactored and now supports ThunderX SoCs, too
   - i2c-tegra and i2c-designware got a bigger bunch of updates
   - a couple of standard driver fixes and improvements"

* 'i2c/for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (71 commits)
  i2c: axxia: disable clks in case of failure in probe
  i2c: octeon: thunderx: Limit register access retries
  i2c: uniphier-f: fix misdetection of incomplete STOP condition
  gpio: pca953x: variable 'id' was used twice
  i2c: i801: Add support for Kaby Lake PCH-H
  gpio: pca953x: fix an incorrect lockdep warning
  i2c: add a warning to i2c_adapter_depth()
  lockdep: make MAX_LOCKDEP_SUBCLASSES unconditionally visible
  i2c: export i2c_adapter_depth()
  i2c: rk3x: Fix variable 'min_total_ns' unused warning
  i2c: rk3x: Fix sparse warning
  i2c / ACPI: Do not touch an I2C device if it belongs to another adapter
  i2c: octeon: Fix high-level controller status check
  i2c: octeon: Avoid sending STOP during recovery
  i2c: octeon: Fix set SCL recovery function
  i2c: rcar: add support for r8a7796 (R-Car M3-W)
  i2c: imx: make bus recovery through pinctrl optional
  i2c: meson: add gxbb compatible string
  i2c: uniphier-f: set the adapter to master mode when probing
  i2c: uniphier-f: avoid WARN_ON() of clk_disable() in failure path
  ...
2016-10-07 14:12:21 -07:00

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/*
Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>,
Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker
<mdsxyz123@yahoo.com>
Copyright (C) 2007 - 2014 Jean Delvare <jdelvare@suse.de>
Copyright (C) 2010 Intel Corporation,
David Woodhouse <dwmw2@infradead.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
/*
* Supports the following Intel I/O Controller Hubs (ICH):
*
* I/O Block I2C
* region SMBus Block proc. block
* Chip name PCI ID size PEC buffer call read
* ---------------------------------------------------------------------------
* 82801AA (ICH) 0x2413 16 no no no no
* 82801AB (ICH0) 0x2423 16 no no no no
* 82801BA (ICH2) 0x2443 16 no no no no
* 82801CA (ICH3) 0x2483 32 soft no no no
* 82801DB (ICH4) 0x24c3 32 hard yes no no
* 82801E (ICH5) 0x24d3 32 hard yes yes yes
* 6300ESB 0x25a4 32 hard yes yes yes
* 82801F (ICH6) 0x266a 32 hard yes yes yes
* 6310ESB/6320ESB 0x269b 32 hard yes yes yes
* 82801G (ICH7) 0x27da 32 hard yes yes yes
* 82801H (ICH8) 0x283e 32 hard yes yes yes
* 82801I (ICH9) 0x2930 32 hard yes yes yes
* EP80579 (Tolapai) 0x5032 32 hard yes yes yes
* ICH10 0x3a30 32 hard yes yes yes
* ICH10 0x3a60 32 hard yes yes yes
* 5/3400 Series (PCH) 0x3b30 32 hard yes yes yes
* 6 Series (PCH) 0x1c22 32 hard yes yes yes
* Patsburg (PCH) 0x1d22 32 hard yes yes yes
* Patsburg (PCH) IDF 0x1d70 32 hard yes yes yes
* Patsburg (PCH) IDF 0x1d71 32 hard yes yes yes
* Patsburg (PCH) IDF 0x1d72 32 hard yes yes yes
* DH89xxCC (PCH) 0x2330 32 hard yes yes yes
* Panther Point (PCH) 0x1e22 32 hard yes yes yes
* Lynx Point (PCH) 0x8c22 32 hard yes yes yes
* Lynx Point-LP (PCH) 0x9c22 32 hard yes yes yes
* Avoton (SOC) 0x1f3c 32 hard yes yes yes
* Wellsburg (PCH) 0x8d22 32 hard yes yes yes
* Wellsburg (PCH) MS 0x8d7d 32 hard yes yes yes
* Wellsburg (PCH) MS 0x8d7e 32 hard yes yes yes
* Wellsburg (PCH) MS 0x8d7f 32 hard yes yes yes
* Coleto Creek (PCH) 0x23b0 32 hard yes yes yes
* Wildcat Point (PCH) 0x8ca2 32 hard yes yes yes
* Wildcat Point-LP (PCH) 0x9ca2 32 hard yes yes yes
* BayTrail (SOC) 0x0f12 32 hard yes yes yes
* Sunrise Point-H (PCH) 0xa123 32 hard yes yes yes
* Sunrise Point-LP (PCH) 0x9d23 32 hard yes yes yes
* DNV (SOC) 0x19df 32 hard yes yes yes
* Broxton (SOC) 0x5ad4 32 hard yes yes yes
* Lewisburg (PCH) 0xa1a3 32 hard yes yes yes
* Lewisburg Supersku (PCH) 0xa223 32 hard yes yes yes
* Kaby Lake PCH-H (PCH) 0xa2a3 32 hard yes yes yes
*
* Features supported by this driver:
* Software PEC no
* Hardware PEC yes
* Block buffer yes
* Block process call transaction no
* I2C block read transaction yes (doesn't use the block buffer)
* Slave mode no
* SMBus Host Notify yes
* Interrupt processing yes
*
* See the file Documentation/i2c/busses/i2c-i801 for details.
*/
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c-smbus.h>
#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/dmi.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/platform_data/itco_wdt.h>
#include <linux/pm_runtime.h>
#if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
#include <linux/gpio.h>
#include <linux/i2c-mux-gpio.h>
#endif
/* I801 SMBus address offsets */
#define SMBHSTSTS(p) (0 + (p)->smba)
#define SMBHSTCNT(p) (2 + (p)->smba)
#define SMBHSTCMD(p) (3 + (p)->smba)
#define SMBHSTADD(p) (4 + (p)->smba)
#define SMBHSTDAT0(p) (5 + (p)->smba)
#define SMBHSTDAT1(p) (6 + (p)->smba)
#define SMBBLKDAT(p) (7 + (p)->smba)
#define SMBPEC(p) (8 + (p)->smba) /* ICH3 and later */
#define SMBAUXSTS(p) (12 + (p)->smba) /* ICH4 and later */
#define SMBAUXCTL(p) (13 + (p)->smba) /* ICH4 and later */
#define SMBSLVSTS(p) (16 + (p)->smba) /* ICH3 and later */
#define SMBSLVCMD(p) (17 + (p)->smba) /* ICH3 and later */
#define SMBNTFDADD(p) (20 + (p)->smba) /* ICH3 and later */
#define SMBNTFDDAT(p) (22 + (p)->smba) /* ICH3 and later */
/* PCI Address Constants */
#define SMBBAR 4
#define SMBPCICTL 0x004
#define SMBPCISTS 0x006
#define SMBHSTCFG 0x040
#define TCOBASE 0x050
#define TCOCTL 0x054
#define ACPIBASE 0x040
#define ACPIBASE_SMI_OFF 0x030
#define ACPICTRL 0x044
#define ACPICTRL_EN 0x080
#define SBREG_BAR 0x10
#define SBREG_SMBCTRL 0xc6000c
/* Host status bits for SMBPCISTS */
#define SMBPCISTS_INTS 0x08
/* Control bits for SMBPCICTL */
#define SMBPCICTL_INTDIS 0x0400
/* Host configuration bits for SMBHSTCFG */
#define SMBHSTCFG_HST_EN 1
#define SMBHSTCFG_SMB_SMI_EN 2
#define SMBHSTCFG_I2C_EN 4
/* TCO configuration bits for TCOCTL */
#define TCOCTL_EN 0x0100
/* Auxiliary status register bits, ICH4+ only */
#define SMBAUXSTS_CRCE 1
#define SMBAUXSTS_STCO 2
/* Auxiliary control register bits, ICH4+ only */
#define SMBAUXCTL_CRC 1
#define SMBAUXCTL_E32B 2
/* Other settings */
#define MAX_RETRIES 400
/* I801 command constants */
#define I801_QUICK 0x00
#define I801_BYTE 0x04
#define I801_BYTE_DATA 0x08
#define I801_WORD_DATA 0x0C
#define I801_PROC_CALL 0x10 /* unimplemented */
#define I801_BLOCK_DATA 0x14
#define I801_I2C_BLOCK_DATA 0x18 /* ICH5 and later */
/* I801 Host Control register bits */
#define SMBHSTCNT_INTREN 0x01
#define SMBHSTCNT_KILL 0x02
#define SMBHSTCNT_LAST_BYTE 0x20
#define SMBHSTCNT_START 0x40
#define SMBHSTCNT_PEC_EN 0x80 /* ICH3 and later */
/* I801 Hosts Status register bits */
#define SMBHSTSTS_BYTE_DONE 0x80
#define SMBHSTSTS_INUSE_STS 0x40
#define SMBHSTSTS_SMBALERT_STS 0x20
#define SMBHSTSTS_FAILED 0x10
#define SMBHSTSTS_BUS_ERR 0x08
#define SMBHSTSTS_DEV_ERR 0x04
#define SMBHSTSTS_INTR 0x02
#define SMBHSTSTS_HOST_BUSY 0x01
/* Host Notify Status registers bits */
#define SMBSLVSTS_HST_NTFY_STS 1
/* Host Notify Command registers bits */
#define SMBSLVCMD_HST_NTFY_INTREN 0x01
#define STATUS_ERROR_FLAGS (SMBHSTSTS_FAILED | SMBHSTSTS_BUS_ERR | \
SMBHSTSTS_DEV_ERR)
#define STATUS_FLAGS (SMBHSTSTS_BYTE_DONE | SMBHSTSTS_INTR | \
STATUS_ERROR_FLAGS)
/* Older devices have their ID defined in <linux/pci_ids.h> */
#define PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS 0x0f12
#define PCI_DEVICE_ID_INTEL_DNV_SMBUS 0x19df
#define PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS 0x1c22
#define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS 0x1d22
/* Patsburg also has three 'Integrated Device Function' SMBus controllers */
#define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0 0x1d70
#define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1 0x1d71
#define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2 0x1d72
#define PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS 0x1e22
#define PCI_DEVICE_ID_INTEL_AVOTON_SMBUS 0x1f3c
#define PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS 0x2292
#define PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS 0x2330
#define PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS 0x23b0
#define PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS 0x3b30
#define PCI_DEVICE_ID_INTEL_BROXTON_SMBUS 0x5ad4
#define PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS 0x8c22
#define PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS 0x8ca2
#define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS 0x8d22
#define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0 0x8d7d
#define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1 0x8d7e
#define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2 0x8d7f
#define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS 0x9c22
#define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS 0x9ca2
#define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS 0x9d23
#define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS 0xa123
#define PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS 0xa1a3
#define PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS 0xa223
#define PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS 0xa2a3
struct i801_mux_config {
char *gpio_chip;
unsigned values[3];
int n_values;
unsigned classes[3];
unsigned gpios[2]; /* Relative to gpio_chip->base */
int n_gpios;
};
struct i801_priv {
struct i2c_adapter adapter;
unsigned long smba;
unsigned char original_hstcfg;
struct pci_dev *pci_dev;
unsigned int features;
/* isr processing */
wait_queue_head_t waitq;
u8 status;
/* Command state used by isr for byte-by-byte block transactions */
u8 cmd;
bool is_read;
int count;
int len;
u8 *data;
#if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
const struct i801_mux_config *mux_drvdata;
struct platform_device *mux_pdev;
#endif
struct platform_device *tco_pdev;
/*
* If set to true the host controller registers are reserved for
* ACPI AML use. Protected by acpi_lock.
*/
bool acpi_reserved;
struct mutex acpi_lock;
struct smbus_host_notify *host_notify;
};
#define SMBHSTNTFY_SIZE 8
#define FEATURE_SMBUS_PEC (1 << 0)
#define FEATURE_BLOCK_BUFFER (1 << 1)
#define FEATURE_BLOCK_PROC (1 << 2)
#define FEATURE_I2C_BLOCK_READ (1 << 3)
#define FEATURE_IRQ (1 << 4)
#define FEATURE_HOST_NOTIFY (1 << 5)
/* Not really a feature, but it's convenient to handle it as such */
#define FEATURE_IDF (1 << 15)
#define FEATURE_TCO (1 << 16)
static const char *i801_feature_names[] = {
"SMBus PEC",
"Block buffer",
"Block process call",
"I2C block read",
"Interrupt",
"SMBus Host Notify",
};
static unsigned int disable_features;
module_param(disable_features, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(disable_features, "Disable selected driver features:\n"
"\t\t 0x01 disable SMBus PEC\n"
"\t\t 0x02 disable the block buffer\n"
"\t\t 0x08 disable the I2C block read functionality\n"
"\t\t 0x10 don't use interrupts\n"
"\t\t 0x20 disable SMBus Host Notify ");
/* Make sure the SMBus host is ready to start transmitting.
Return 0 if it is, -EBUSY if it is not. */
static int i801_check_pre(struct i801_priv *priv)
{
int status;
status = inb_p(SMBHSTSTS(priv));
if (status & SMBHSTSTS_HOST_BUSY) {
dev_err(&priv->pci_dev->dev, "SMBus is busy, can't use it!\n");
return -EBUSY;
}
status &= STATUS_FLAGS;
if (status) {
dev_dbg(&priv->pci_dev->dev, "Clearing status flags (%02x)\n",
status);
outb_p(status, SMBHSTSTS(priv));
status = inb_p(SMBHSTSTS(priv)) & STATUS_FLAGS;
if (status) {
dev_err(&priv->pci_dev->dev,
"Failed clearing status flags (%02x)\n",
status);
return -EBUSY;
}
}
/*
* Clear CRC status if needed.
* During normal operation, i801_check_post() takes care
* of it after every operation. We do it here only in case
* the hardware was already in this state when the driver
* started.
*/
if (priv->features & FEATURE_SMBUS_PEC) {
status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
if (status) {
dev_dbg(&priv->pci_dev->dev,
"Clearing aux status flags (%02x)\n", status);
outb_p(status, SMBAUXSTS(priv));
status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
if (status) {
dev_err(&priv->pci_dev->dev,
"Failed clearing aux status flags (%02x)\n",
status);
return -EBUSY;
}
}
}
return 0;
}
/*
* Convert the status register to an error code, and clear it.
* Note that status only contains the bits we want to clear, not the
* actual register value.
*/
static int i801_check_post(struct i801_priv *priv, int status)
{
int result = 0;
/*
* If the SMBus is still busy, we give up
* Note: This timeout condition only happens when using polling
* transactions. For interrupt operation, NAK/timeout is indicated by
* DEV_ERR.
*/
if (unlikely(status < 0)) {
dev_err(&priv->pci_dev->dev, "Transaction timeout\n");
/* try to stop the current command */
dev_dbg(&priv->pci_dev->dev, "Terminating the current operation\n");
outb_p(inb_p(SMBHSTCNT(priv)) | SMBHSTCNT_KILL,
SMBHSTCNT(priv));
usleep_range(1000, 2000);
outb_p(inb_p(SMBHSTCNT(priv)) & (~SMBHSTCNT_KILL),
SMBHSTCNT(priv));
/* Check if it worked */
status = inb_p(SMBHSTSTS(priv));
if ((status & SMBHSTSTS_HOST_BUSY) ||
!(status & SMBHSTSTS_FAILED))
dev_err(&priv->pci_dev->dev,
"Failed terminating the transaction\n");
outb_p(STATUS_FLAGS, SMBHSTSTS(priv));
return -ETIMEDOUT;
}
if (status & SMBHSTSTS_FAILED) {
result = -EIO;
dev_err(&priv->pci_dev->dev, "Transaction failed\n");
}
if (status & SMBHSTSTS_DEV_ERR) {
/*
* This may be a PEC error, check and clear it.
*
* AUXSTS is handled differently from HSTSTS.
* For HSTSTS, i801_isr() or i801_wait_intr()
* has already cleared the error bits in hardware,
* and we are passed a copy of the original value
* in "status".
* For AUXSTS, the hardware register is left
* for us to handle here.
* This is asymmetric, slightly iffy, but safe,
* since all this code is serialized and the CRCE
* bit is harmless as long as it's cleared before
* the next operation.
*/
if ((priv->features & FEATURE_SMBUS_PEC) &&
(inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE)) {
outb_p(SMBAUXSTS_CRCE, SMBAUXSTS(priv));
result = -EBADMSG;
dev_dbg(&priv->pci_dev->dev, "PEC error\n");
} else {
result = -ENXIO;
dev_dbg(&priv->pci_dev->dev, "No response\n");
}
}
if (status & SMBHSTSTS_BUS_ERR) {
result = -EAGAIN;
dev_dbg(&priv->pci_dev->dev, "Lost arbitration\n");
}
/* Clear status flags except BYTE_DONE, to be cleared by caller */
outb_p(status, SMBHSTSTS(priv));
return result;
}
/* Wait for BUSY being cleared and either INTR or an error flag being set */
static int i801_wait_intr(struct i801_priv *priv)
{
int timeout = 0;
int status;
/* We will always wait for a fraction of a second! */
do {
usleep_range(250, 500);
status = inb_p(SMBHSTSTS(priv));
} while (((status & SMBHSTSTS_HOST_BUSY) ||
!(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR))) &&
(timeout++ < MAX_RETRIES));
if (timeout > MAX_RETRIES) {
dev_dbg(&priv->pci_dev->dev, "INTR Timeout!\n");
return -ETIMEDOUT;
}
return status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR);
}
/* Wait for either BYTE_DONE or an error flag being set */
static int i801_wait_byte_done(struct i801_priv *priv)
{
int timeout = 0;
int status;
/* We will always wait for a fraction of a second! */
do {
usleep_range(250, 500);
status = inb_p(SMBHSTSTS(priv));
} while (!(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_BYTE_DONE)) &&
(timeout++ < MAX_RETRIES));
if (timeout > MAX_RETRIES) {
dev_dbg(&priv->pci_dev->dev, "BYTE_DONE Timeout!\n");
return -ETIMEDOUT;
}
return status & STATUS_ERROR_FLAGS;
}
static int i801_transaction(struct i801_priv *priv, int xact)
{
int status;
int result;
const struct i2c_adapter *adap = &priv->adapter;
result = i801_check_pre(priv);
if (result < 0)
return result;
if (priv->features & FEATURE_IRQ) {
outb_p(xact | SMBHSTCNT_INTREN | SMBHSTCNT_START,
SMBHSTCNT(priv));
result = wait_event_timeout(priv->waitq,
(status = priv->status),
adap->timeout);
if (!result) {
status = -ETIMEDOUT;
dev_warn(&priv->pci_dev->dev,
"Timeout waiting for interrupt!\n");
}
priv->status = 0;
return i801_check_post(priv, status);
}
/* the current contents of SMBHSTCNT can be overwritten, since PEC,
* SMBSCMD are passed in xact */
outb_p(xact | SMBHSTCNT_START, SMBHSTCNT(priv));
status = i801_wait_intr(priv);
return i801_check_post(priv, status);
}
static int i801_block_transaction_by_block(struct i801_priv *priv,
union i2c_smbus_data *data,
char read_write, int hwpec)
{
int i, len;
int status;
inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
/* Use 32-byte buffer to process this transaction */
if (read_write == I2C_SMBUS_WRITE) {
len = data->block[0];
outb_p(len, SMBHSTDAT0(priv));
for (i = 0; i < len; i++)
outb_p(data->block[i+1], SMBBLKDAT(priv));
}
status = i801_transaction(priv, I801_BLOCK_DATA |
(hwpec ? SMBHSTCNT_PEC_EN : 0));
if (status)
return status;
if (read_write == I2C_SMBUS_READ) {
len = inb_p(SMBHSTDAT0(priv));
if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
return -EPROTO;
data->block[0] = len;
for (i = 0; i < len; i++)
data->block[i + 1] = inb_p(SMBBLKDAT(priv));
}
return 0;
}
static void i801_isr_byte_done(struct i801_priv *priv)
{
if (priv->is_read) {
/* For SMBus block reads, length is received with first byte */
if (((priv->cmd & 0x1c) == I801_BLOCK_DATA) &&
(priv->count == 0)) {
priv->len = inb_p(SMBHSTDAT0(priv));
if (priv->len < 1 || priv->len > I2C_SMBUS_BLOCK_MAX) {
dev_err(&priv->pci_dev->dev,
"Illegal SMBus block read size %d\n",
priv->len);
/* FIXME: Recover */
priv->len = I2C_SMBUS_BLOCK_MAX;
} else {
dev_dbg(&priv->pci_dev->dev,
"SMBus block read size is %d\n",
priv->len);
}
priv->data[-1] = priv->len;
}
/* Read next byte */
if (priv->count < priv->len)
priv->data[priv->count++] = inb(SMBBLKDAT(priv));
else
dev_dbg(&priv->pci_dev->dev,
"Discarding extra byte on block read\n");
/* Set LAST_BYTE for last byte of read transaction */
if (priv->count == priv->len - 1)
outb_p(priv->cmd | SMBHSTCNT_LAST_BYTE,
SMBHSTCNT(priv));
} else if (priv->count < priv->len - 1) {
/* Write next byte, except for IRQ after last byte */
outb_p(priv->data[++priv->count], SMBBLKDAT(priv));
}
/* Clear BYTE_DONE to continue with next byte */
outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
}
static irqreturn_t i801_host_notify_isr(struct i801_priv *priv)
{
unsigned short addr;
unsigned int data;
addr = inb_p(SMBNTFDADD(priv)) >> 1;
data = inw_p(SMBNTFDDAT(priv));
i2c_handle_smbus_host_notify(priv->host_notify, addr, data);
/* clear Host Notify bit and return */
outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
return IRQ_HANDLED;
}
/*
* There are three kinds of interrupts:
*
* 1) i801 signals transaction completion with one of these interrupts:
* INTR - Success
* DEV_ERR - Invalid command, NAK or communication timeout
* BUS_ERR - SMI# transaction collision
* FAILED - transaction was canceled due to a KILL request
* When any of these occur, update ->status and wake up the waitq.
* ->status must be cleared before kicking off the next transaction.
*
* 2) For byte-by-byte (I2C read/write) transactions, one BYTE_DONE interrupt
* occurs for each byte of a byte-by-byte to prepare the next byte.
*
* 3) Host Notify interrupts
*/
static irqreturn_t i801_isr(int irq, void *dev_id)
{
struct i801_priv *priv = dev_id;
u16 pcists;
u8 status;
/* Confirm this is our interrupt */
pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
if (!(pcists & SMBPCISTS_INTS))
return IRQ_NONE;
if (priv->features & FEATURE_HOST_NOTIFY) {
status = inb_p(SMBSLVSTS(priv));
if (status & SMBSLVSTS_HST_NTFY_STS)
return i801_host_notify_isr(priv);
}
status = inb_p(SMBHSTSTS(priv));
if (status & SMBHSTSTS_BYTE_DONE)
i801_isr_byte_done(priv);
/*
* Clear irq sources and report transaction result.
* ->status must be cleared before the next transaction is started.
*/
status &= SMBHSTSTS_INTR | STATUS_ERROR_FLAGS;
if (status) {
outb_p(status, SMBHSTSTS(priv));
priv->status = status;
wake_up(&priv->waitq);
}
return IRQ_HANDLED;
}
/*
* For "byte-by-byte" block transactions:
* I2C write uses cmd=I801_BLOCK_DATA, I2C_EN=1
* I2C read uses cmd=I801_I2C_BLOCK_DATA
*/
static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
union i2c_smbus_data *data,
char read_write, int command,
int hwpec)
{
int i, len;
int smbcmd;
int status;
int result;
const struct i2c_adapter *adap = &priv->adapter;
result = i801_check_pre(priv);
if (result < 0)
return result;
len = data->block[0];
if (read_write == I2C_SMBUS_WRITE) {
outb_p(len, SMBHSTDAT0(priv));
outb_p(data->block[1], SMBBLKDAT(priv));
}
if (command == I2C_SMBUS_I2C_BLOCK_DATA &&
read_write == I2C_SMBUS_READ)
smbcmd = I801_I2C_BLOCK_DATA;
else
smbcmd = I801_BLOCK_DATA;
if (priv->features & FEATURE_IRQ) {
priv->is_read = (read_write == I2C_SMBUS_READ);
if (len == 1 && priv->is_read)
smbcmd |= SMBHSTCNT_LAST_BYTE;
priv->cmd = smbcmd | SMBHSTCNT_INTREN;
priv->len = len;
priv->count = 0;
priv->data = &data->block[1];
outb_p(priv->cmd | SMBHSTCNT_START, SMBHSTCNT(priv));
result = wait_event_timeout(priv->waitq,
(status = priv->status),
adap->timeout);
if (!result) {
status = -ETIMEDOUT;
dev_warn(&priv->pci_dev->dev,
"Timeout waiting for interrupt!\n");
}
priv->status = 0;
return i801_check_post(priv, status);
}
for (i = 1; i <= len; i++) {
if (i == len && read_write == I2C_SMBUS_READ)
smbcmd |= SMBHSTCNT_LAST_BYTE;
outb_p(smbcmd, SMBHSTCNT(priv));
if (i == 1)
outb_p(inb(SMBHSTCNT(priv)) | SMBHSTCNT_START,
SMBHSTCNT(priv));
status = i801_wait_byte_done(priv);
if (status)
goto exit;
if (i == 1 && read_write == I2C_SMBUS_READ
&& command != I2C_SMBUS_I2C_BLOCK_DATA) {
len = inb_p(SMBHSTDAT0(priv));
if (len < 1 || len > I2C_SMBUS_BLOCK_MAX) {
dev_err(&priv->pci_dev->dev,
"Illegal SMBus block read size %d\n",
len);
/* Recover */
while (inb_p(SMBHSTSTS(priv)) &
SMBHSTSTS_HOST_BUSY)
outb_p(SMBHSTSTS_BYTE_DONE,
SMBHSTSTS(priv));
outb_p(SMBHSTSTS_INTR, SMBHSTSTS(priv));
return -EPROTO;
}
data->block[0] = len;
}
/* Retrieve/store value in SMBBLKDAT */
if (read_write == I2C_SMBUS_READ)
data->block[i] = inb_p(SMBBLKDAT(priv));
if (read_write == I2C_SMBUS_WRITE && i+1 <= len)
outb_p(data->block[i+1], SMBBLKDAT(priv));
/* signals SMBBLKDAT ready */
outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
}
status = i801_wait_intr(priv);
exit:
return i801_check_post(priv, status);
}
static int i801_set_block_buffer_mode(struct i801_priv *priv)
{
outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_E32B, SMBAUXCTL(priv));
if ((inb_p(SMBAUXCTL(priv)) & SMBAUXCTL_E32B) == 0)
return -EIO;
return 0;
}
/* Block transaction function */
static int i801_block_transaction(struct i801_priv *priv,
union i2c_smbus_data *data, char read_write,
int command, int hwpec)
{
int result = 0;
unsigned char hostc;
if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
if (read_write == I2C_SMBUS_WRITE) {
/* set I2C_EN bit in configuration register */
pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &hostc);
pci_write_config_byte(priv->pci_dev, SMBHSTCFG,
hostc | SMBHSTCFG_I2C_EN);
} else if (!(priv->features & FEATURE_I2C_BLOCK_READ)) {
dev_err(&priv->pci_dev->dev,
"I2C block read is unsupported!\n");
return -EOPNOTSUPP;
}
}
if (read_write == I2C_SMBUS_WRITE
|| command == I2C_SMBUS_I2C_BLOCK_DATA) {
if (data->block[0] < 1)
data->block[0] = 1;
if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
data->block[0] = I2C_SMBUS_BLOCK_MAX;
} else {
data->block[0] = 32; /* max for SMBus block reads */
}
/* Experience has shown that the block buffer can only be used for
SMBus (not I2C) block transactions, even though the datasheet
doesn't mention this limitation. */
if ((priv->features & FEATURE_BLOCK_BUFFER)
&& command != I2C_SMBUS_I2C_BLOCK_DATA
&& i801_set_block_buffer_mode(priv) == 0)
result = i801_block_transaction_by_block(priv, data,
read_write, hwpec);
else
result = i801_block_transaction_byte_by_byte(priv, data,
read_write,
command, hwpec);
if (command == I2C_SMBUS_I2C_BLOCK_DATA
&& read_write == I2C_SMBUS_WRITE) {
/* restore saved configuration register value */
pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hostc);
}
return result;
}
/* Return negative errno on error. */
static s32 i801_access(struct i2c_adapter *adap, u16 addr,
unsigned short flags, char read_write, u8 command,
int size, union i2c_smbus_data *data)
{
int hwpec;
int block = 0;
int ret = 0, xact = 0;
struct i801_priv *priv = i2c_get_adapdata(adap);
mutex_lock(&priv->acpi_lock);
if (priv->acpi_reserved) {
mutex_unlock(&priv->acpi_lock);
return -EBUSY;
}
pm_runtime_get_sync(&priv->pci_dev->dev);
hwpec = (priv->features & FEATURE_SMBUS_PEC) && (flags & I2C_CLIENT_PEC)
&& size != I2C_SMBUS_QUICK
&& size != I2C_SMBUS_I2C_BLOCK_DATA;
switch (size) {
case I2C_SMBUS_QUICK:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
xact = I801_QUICK;
break;
case I2C_SMBUS_BYTE:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
if (read_write == I2C_SMBUS_WRITE)
outb_p(command, SMBHSTCMD(priv));
xact = I801_BYTE;
break;
case I2C_SMBUS_BYTE_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
outb_p(command, SMBHSTCMD(priv));
if (read_write == I2C_SMBUS_WRITE)
outb_p(data->byte, SMBHSTDAT0(priv));
xact = I801_BYTE_DATA;
break;
case I2C_SMBUS_WORD_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
outb_p(command, SMBHSTCMD(priv));
if (read_write == I2C_SMBUS_WRITE) {
outb_p(data->word & 0xff, SMBHSTDAT0(priv));
outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
}
xact = I801_WORD_DATA;
break;
case I2C_SMBUS_BLOCK_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
outb_p(command, SMBHSTCMD(priv));
block = 1;
break;
case I2C_SMBUS_I2C_BLOCK_DATA:
/* NB: page 240 of ICH5 datasheet shows that the R/#W
* bit should be cleared here, even when reading */
outb_p((addr & 0x7f) << 1, SMBHSTADD(priv));
if (read_write == I2C_SMBUS_READ) {
/* NB: page 240 of ICH5 datasheet also shows
* that DATA1 is the cmd field when reading */
outb_p(command, SMBHSTDAT1(priv));
} else
outb_p(command, SMBHSTCMD(priv));
block = 1;
break;
default:
dev_err(&priv->pci_dev->dev, "Unsupported transaction %d\n",
size);
ret = -EOPNOTSUPP;
goto out;
}
if (hwpec) /* enable/disable hardware PEC */
outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_CRC, SMBAUXCTL(priv));
else
outb_p(inb_p(SMBAUXCTL(priv)) & (~SMBAUXCTL_CRC),
SMBAUXCTL(priv));
if (block)
ret = i801_block_transaction(priv, data, read_write, size,
hwpec);
else
ret = i801_transaction(priv, xact);
/* Some BIOSes don't like it when PEC is enabled at reboot or resume
time, so we forcibly disable it after every transaction. Turn off
E32B for the same reason. */
if (hwpec || block)
outb_p(inb_p(SMBAUXCTL(priv)) &
~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
if (block)
goto out;
if (ret)
goto out;
if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK))
goto out;
switch (xact & 0x7f) {
case I801_BYTE: /* Result put in SMBHSTDAT0 */
case I801_BYTE_DATA:
data->byte = inb_p(SMBHSTDAT0(priv));
break;
case I801_WORD_DATA:
data->word = inb_p(SMBHSTDAT0(priv)) +
(inb_p(SMBHSTDAT1(priv)) << 8);
break;
}
out:
pm_runtime_mark_last_busy(&priv->pci_dev->dev);
pm_runtime_put_autosuspend(&priv->pci_dev->dev);
mutex_unlock(&priv->acpi_lock);
return ret;
}
static u32 i801_func(struct i2c_adapter *adapter)
{
struct i801_priv *priv = i2c_get_adapdata(adapter);
return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
((priv->features & FEATURE_SMBUS_PEC) ? I2C_FUNC_SMBUS_PEC : 0) |
((priv->features & FEATURE_I2C_BLOCK_READ) ?
I2C_FUNC_SMBUS_READ_I2C_BLOCK : 0) |
((priv->features & FEATURE_HOST_NOTIFY) ?
I2C_FUNC_SMBUS_HOST_NOTIFY : 0);
}
static int i801_enable_host_notify(struct i2c_adapter *adapter)
{
struct i801_priv *priv = i2c_get_adapdata(adapter);
if (!(priv->features & FEATURE_HOST_NOTIFY))
return -ENOTSUPP;
if (!priv->host_notify)
priv->host_notify = i2c_setup_smbus_host_notify(adapter);
if (!priv->host_notify)
return -ENOMEM;
outb_p(SMBSLVCMD_HST_NTFY_INTREN, SMBSLVCMD(priv));
/* clear Host Notify bit to allow a new notification */
outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
return 0;
}
static const struct i2c_algorithm smbus_algorithm = {
.smbus_xfer = i801_access,
.functionality = i801_func,
};
static const struct pci_device_id i801_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_3) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_3) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_2) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_3) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_3) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_3) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_4) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_16) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_17) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_17) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_5) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_6) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EP80579_1) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_4) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_5) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_AVOTON_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DNV_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BROXTON_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS) },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, i801_ids);
#if defined CONFIG_X86 && defined CONFIG_DMI
static unsigned char apanel_addr;
/* Scan the system ROM for the signature "FJKEYINF" */
static __init const void __iomem *bios_signature(const void __iomem *bios)
{
ssize_t offset;
const unsigned char signature[] = "FJKEYINF";
for (offset = 0; offset < 0x10000; offset += 0x10) {
if (check_signature(bios + offset, signature,
sizeof(signature)-1))
return bios + offset;
}
return NULL;
}
static void __init input_apanel_init(void)
{
void __iomem *bios;
const void __iomem *p;
bios = ioremap(0xF0000, 0x10000); /* Can't fail */
p = bios_signature(bios);
if (p) {
/* just use the first address */
apanel_addr = readb(p + 8 + 3) >> 1;
}
iounmap(bios);
}
struct dmi_onboard_device_info {
const char *name;
u8 type;
unsigned short i2c_addr;
const char *i2c_type;
};
static const struct dmi_onboard_device_info dmi_devices[] = {
{ "Syleus", DMI_DEV_TYPE_OTHER, 0x73, "fscsyl" },
{ "Hermes", DMI_DEV_TYPE_OTHER, 0x73, "fscher" },
{ "Hades", DMI_DEV_TYPE_OTHER, 0x73, "fschds" },
};
static void dmi_check_onboard_device(u8 type, const char *name,
struct i2c_adapter *adap)
{
int i;
struct i2c_board_info info;
for (i = 0; i < ARRAY_SIZE(dmi_devices); i++) {
/* & ~0x80, ignore enabled/disabled bit */
if ((type & ~0x80) != dmi_devices[i].type)
continue;
if (strcasecmp(name, dmi_devices[i].name))
continue;
memset(&info, 0, sizeof(struct i2c_board_info));
info.addr = dmi_devices[i].i2c_addr;
strlcpy(info.type, dmi_devices[i].i2c_type, I2C_NAME_SIZE);
i2c_new_device(adap, &info);
break;
}
}
/* We use our own function to check for onboard devices instead of
dmi_find_device() as some buggy BIOS's have the devices we are interested
in marked as disabled */
static void dmi_check_onboard_devices(const struct dmi_header *dm, void *adap)
{
int i, count;
if (dm->type != 10)
return;
count = (dm->length - sizeof(struct dmi_header)) / 2;
for (i = 0; i < count; i++) {
const u8 *d = (char *)(dm + 1) + (i * 2);
const char *name = ((char *) dm) + dm->length;
u8 type = d[0];
u8 s = d[1];
if (!s)
continue;
s--;
while (s > 0 && name[0]) {
name += strlen(name) + 1;
s--;
}
if (name[0] == 0) /* Bogus string reference */
continue;
dmi_check_onboard_device(type, name, adap);
}
}
/* Register optional slaves */
static void i801_probe_optional_slaves(struct i801_priv *priv)
{
/* Only register slaves on main SMBus channel */
if (priv->features & FEATURE_IDF)
return;
if (apanel_addr) {
struct i2c_board_info info;
memset(&info, 0, sizeof(struct i2c_board_info));
info.addr = apanel_addr;
strlcpy(info.type, "fujitsu_apanel", I2C_NAME_SIZE);
i2c_new_device(&priv->adapter, &info);
}
if (dmi_name_in_vendors("FUJITSU"))
dmi_walk(dmi_check_onboard_devices, &priv->adapter);
}
#else
static void __init input_apanel_init(void) {}
static void i801_probe_optional_slaves(struct i801_priv *priv) {}
#endif /* CONFIG_X86 && CONFIG_DMI */
#if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
static struct i801_mux_config i801_mux_config_asus_z8_d12 = {
.gpio_chip = "gpio_ich",
.values = { 0x02, 0x03 },
.n_values = 2,
.classes = { I2C_CLASS_SPD, I2C_CLASS_SPD },
.gpios = { 52, 53 },
.n_gpios = 2,
};
static struct i801_mux_config i801_mux_config_asus_z8_d18 = {
.gpio_chip = "gpio_ich",
.values = { 0x02, 0x03, 0x01 },
.n_values = 3,
.classes = { I2C_CLASS_SPD, I2C_CLASS_SPD, I2C_CLASS_SPD },
.gpios = { 52, 53 },
.n_gpios = 2,
};
static const struct dmi_system_id mux_dmi_table[] = {
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8NA-D6(C)"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)E-D12(X)"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8NH-D12"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8PH-D12/IFB"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8NR-D12"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)H-D12"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8PG-D18"),
},
.driver_data = &i801_mux_config_asus_z8_d18,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8PE-D18"),
},
.driver_data = &i801_mux_config_asus_z8_d18,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "Z8PS-D12"),
},
.driver_data = &i801_mux_config_asus_z8_d12,
},
{ }
};
/* Setup multiplexing if needed */
static int i801_add_mux(struct i801_priv *priv)
{
struct device *dev = &priv->adapter.dev;
const struct i801_mux_config *mux_config;
struct i2c_mux_gpio_platform_data gpio_data;
int err;
if (!priv->mux_drvdata)
return 0;
mux_config = priv->mux_drvdata;
/* Prepare the platform data */
memset(&gpio_data, 0, sizeof(struct i2c_mux_gpio_platform_data));
gpio_data.parent = priv->adapter.nr;
gpio_data.values = mux_config->values;
gpio_data.n_values = mux_config->n_values;
gpio_data.classes = mux_config->classes;
gpio_data.gpio_chip = mux_config->gpio_chip;
gpio_data.gpios = mux_config->gpios;
gpio_data.n_gpios = mux_config->n_gpios;
gpio_data.idle = I2C_MUX_GPIO_NO_IDLE;
/* Register the mux device */
priv->mux_pdev = platform_device_register_data(dev, "i2c-mux-gpio",
PLATFORM_DEVID_AUTO, &gpio_data,
sizeof(struct i2c_mux_gpio_platform_data));
if (IS_ERR(priv->mux_pdev)) {
err = PTR_ERR(priv->mux_pdev);
priv->mux_pdev = NULL;
dev_err(dev, "Failed to register i2c-mux-gpio device\n");
return err;
}
return 0;
}
static void i801_del_mux(struct i801_priv *priv)
{
if (priv->mux_pdev)
platform_device_unregister(priv->mux_pdev);
}
static unsigned int i801_get_adapter_class(struct i801_priv *priv)
{
const struct dmi_system_id *id;
const struct i801_mux_config *mux_config;
unsigned int class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
int i;
id = dmi_first_match(mux_dmi_table);
if (id) {
/* Remove branch classes from trunk */
mux_config = id->driver_data;
for (i = 0; i < mux_config->n_values; i++)
class &= ~mux_config->classes[i];
/* Remember for later */
priv->mux_drvdata = mux_config;
}
return class;
}
#else
static inline int i801_add_mux(struct i801_priv *priv) { return 0; }
static inline void i801_del_mux(struct i801_priv *priv) { }
static inline unsigned int i801_get_adapter_class(struct i801_priv *priv)
{
return I2C_CLASS_HWMON | I2C_CLASS_SPD;
}
#endif
static const struct itco_wdt_platform_data tco_platform_data = {
.name = "Intel PCH",
.version = 4,
};
static DEFINE_SPINLOCK(p2sb_spinlock);
static void i801_add_tco(struct i801_priv *priv)
{
struct pci_dev *pci_dev = priv->pci_dev;
struct resource tco_res[3], *res;
struct platform_device *pdev;
unsigned int devfn;
u32 tco_base, tco_ctl;
u32 base_addr, ctrl_val;
u64 base64_addr;
if (!(priv->features & FEATURE_TCO))
return;
pci_read_config_dword(pci_dev, TCOBASE, &tco_base);
pci_read_config_dword(pci_dev, TCOCTL, &tco_ctl);
if (!(tco_ctl & TCOCTL_EN))
return;
memset(tco_res, 0, sizeof(tco_res));
res = &tco_res[ICH_RES_IO_TCO];
res->start = tco_base & ~1;
res->end = res->start + 32 - 1;
res->flags = IORESOURCE_IO;
/*
* Power Management registers.
*/
devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 2);
pci_bus_read_config_dword(pci_dev->bus, devfn, ACPIBASE, &base_addr);
res = &tco_res[ICH_RES_IO_SMI];
res->start = (base_addr & ~1) + ACPIBASE_SMI_OFF;
res->end = res->start + 3;
res->flags = IORESOURCE_IO;
/*
* Enable the ACPI I/O space.
*/
pci_bus_read_config_dword(pci_dev->bus, devfn, ACPICTRL, &ctrl_val);
ctrl_val |= ACPICTRL_EN;
pci_bus_write_config_dword(pci_dev->bus, devfn, ACPICTRL, ctrl_val);
/*
* We must access the NO_REBOOT bit over the Primary to Sideband
* bridge (P2SB). The BIOS prevents the P2SB device from being
* enumerated by the PCI subsystem, so we need to unhide/hide it
* to lookup the P2SB BAR.
*/
spin_lock(&p2sb_spinlock);
devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 1);
/* Unhide the P2SB device */
pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, 0x0);
pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR, &base_addr);
base64_addr = base_addr & 0xfffffff0;
pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR + 0x4, &base_addr);
base64_addr |= (u64)base_addr << 32;
/* Hide the P2SB device */
pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, 0x1);
spin_unlock(&p2sb_spinlock);
res = &tco_res[ICH_RES_MEM_OFF];
res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL;
res->end = res->start + 3;
res->flags = IORESOURCE_MEM;
pdev = platform_device_register_resndata(&pci_dev->dev, "iTCO_wdt", -1,
tco_res, 3, &tco_platform_data,
sizeof(tco_platform_data));
if (IS_ERR(pdev)) {
dev_warn(&pci_dev->dev, "failed to create iTCO device\n");
return;
}
priv->tco_pdev = pdev;
}
#ifdef CONFIG_ACPI
static acpi_status
i801_acpi_io_handler(u32 function, acpi_physical_address address, u32 bits,
u64 *value, void *handler_context, void *region_context)
{
struct i801_priv *priv = handler_context;
struct pci_dev *pdev = priv->pci_dev;
acpi_status status;
/*
* Once BIOS AML code touches the OpRegion we warn and inhibit any
* further access from the driver itself. This device is now owned
* by the system firmware.
*/
mutex_lock(&priv->acpi_lock);
if (!priv->acpi_reserved) {
priv->acpi_reserved = true;
dev_warn(&pdev->dev, "BIOS is accessing SMBus registers\n");
dev_warn(&pdev->dev, "Driver SMBus register access inhibited\n");
/*
* BIOS is accessing the host controller so prevent it from
* suspending automatically from now on.
*/
pm_runtime_get_sync(&pdev->dev);
}
if ((function & ACPI_IO_MASK) == ACPI_READ)
status = acpi_os_read_port(address, (u32 *)value, bits);
else
status = acpi_os_write_port(address, (u32)*value, bits);
mutex_unlock(&priv->acpi_lock);
return status;
}
static int i801_acpi_probe(struct i801_priv *priv)
{
struct acpi_device *adev;
acpi_status status;
adev = ACPI_COMPANION(&priv->pci_dev->dev);
if (adev) {
status = acpi_install_address_space_handler(adev->handle,
ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler,
NULL, priv);
if (ACPI_SUCCESS(status))
return 0;
}
return acpi_check_resource_conflict(&priv->pci_dev->resource[SMBBAR]);
}
static void i801_acpi_remove(struct i801_priv *priv)
{
struct acpi_device *adev;
adev = ACPI_COMPANION(&priv->pci_dev->dev);
if (!adev)
return;
acpi_remove_address_space_handler(adev->handle,
ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler);
mutex_lock(&priv->acpi_lock);
if (priv->acpi_reserved)
pm_runtime_put(&priv->pci_dev->dev);
mutex_unlock(&priv->acpi_lock);
}
#else
static inline int i801_acpi_probe(struct i801_priv *priv) { return 0; }
static inline void i801_acpi_remove(struct i801_priv *priv) { }
#endif
static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
unsigned char temp;
int err, i;
struct i801_priv *priv;
priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
i2c_set_adapdata(&priv->adapter, priv);
priv->adapter.owner = THIS_MODULE;
priv->adapter.class = i801_get_adapter_class(priv);
priv->adapter.algo = &smbus_algorithm;
priv->adapter.dev.parent = &dev->dev;
ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&dev->dev));
priv->adapter.retries = 3;
mutex_init(&priv->acpi_lock);
priv->pci_dev = dev;
switch (dev->device) {
case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS:
case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS:
case PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS:
case PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS:
case PCI_DEVICE_ID_INTEL_DNV_SMBUS:
case PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS:
priv->features |= FEATURE_I2C_BLOCK_READ;
priv->features |= FEATURE_IRQ;
priv->features |= FEATURE_SMBUS_PEC;
priv->features |= FEATURE_BLOCK_BUFFER;
/* If we have ACPI based watchdog use that instead */
if (!acpi_has_watchdog())
priv->features |= FEATURE_TCO;
priv->features |= FEATURE_HOST_NOTIFY;
break;
case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0:
case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1:
case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2:
case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0:
case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1:
case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2:
priv->features |= FEATURE_IDF;
/* fall through */
default:
priv->features |= FEATURE_I2C_BLOCK_READ;
priv->features |= FEATURE_IRQ;
/* fall through */
case PCI_DEVICE_ID_INTEL_82801DB_3:
priv->features |= FEATURE_SMBUS_PEC;
priv->features |= FEATURE_BLOCK_BUFFER;
/* fall through */
case PCI_DEVICE_ID_INTEL_82801CA_3:
priv->features |= FEATURE_HOST_NOTIFY;
/* fall through */
case PCI_DEVICE_ID_INTEL_82801BA_2:
case PCI_DEVICE_ID_INTEL_82801AB_3:
case PCI_DEVICE_ID_INTEL_82801AA_3:
break;
}
/* Disable features on user request */
for (i = 0; i < ARRAY_SIZE(i801_feature_names); i++) {
if (priv->features & disable_features & (1 << i))
dev_notice(&dev->dev, "%s disabled by user\n",
i801_feature_names[i]);
}
priv->features &= ~disable_features;
err = pcim_enable_device(dev);
if (err) {
dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n",
err);
return err;
}
pcim_pin_device(dev);
/* Determine the address of the SMBus area */
priv->smba = pci_resource_start(dev, SMBBAR);
if (!priv->smba) {
dev_err(&dev->dev,
"SMBus base address uninitialized, upgrade BIOS\n");
return -ENODEV;
}
if (i801_acpi_probe(priv))
return -ENODEV;
err = pcim_iomap_regions(dev, 1 << SMBBAR,
dev_driver_string(&dev->dev));
if (err) {
dev_err(&dev->dev,
"Failed to request SMBus region 0x%lx-0x%Lx\n",
priv->smba,
(unsigned long long)pci_resource_end(dev, SMBBAR));
i801_acpi_remove(priv);
return err;
}
pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &temp);
priv->original_hstcfg = temp;
temp &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */
if (!(temp & SMBHSTCFG_HST_EN)) {
dev_info(&dev->dev, "Enabling SMBus device\n");
temp |= SMBHSTCFG_HST_EN;
}
pci_write_config_byte(priv->pci_dev, SMBHSTCFG, temp);
if (temp & SMBHSTCFG_SMB_SMI_EN) {
dev_dbg(&dev->dev, "SMBus using interrupt SMI#\n");
/* Disable SMBus interrupt feature if SMBus using SMI# */
priv->features &= ~FEATURE_IRQ;
}
/* Clear special mode bits */
if (priv->features & (FEATURE_SMBUS_PEC | FEATURE_BLOCK_BUFFER))
outb_p(inb_p(SMBAUXCTL(priv)) &
~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
/* Default timeout in interrupt mode: 200 ms */
priv->adapter.timeout = HZ / 5;
if (priv->features & FEATURE_IRQ) {
u16 pcictl, pcists;
/* Complain if an interrupt is already pending */
pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
if (pcists & SMBPCISTS_INTS)
dev_warn(&dev->dev, "An interrupt is pending!\n");
/* Check if interrupts have been disabled */
pci_read_config_word(priv->pci_dev, SMBPCICTL, &pcictl);
if (pcictl & SMBPCICTL_INTDIS) {
dev_info(&dev->dev, "Interrupts are disabled\n");
priv->features &= ~FEATURE_IRQ;
}
}
if (priv->features & FEATURE_IRQ) {
init_waitqueue_head(&priv->waitq);
err = devm_request_irq(&dev->dev, dev->irq, i801_isr,
IRQF_SHARED,
dev_driver_string(&dev->dev), priv);
if (err) {
dev_err(&dev->dev, "Failed to allocate irq %d: %d\n",
dev->irq, err);
priv->features &= ~FEATURE_IRQ;
}
}
dev_info(&dev->dev, "SMBus using %s\n",
priv->features & FEATURE_IRQ ? "PCI interrupt" : "polling");
i801_add_tco(priv);
snprintf(priv->adapter.name, sizeof(priv->adapter.name),
"SMBus I801 adapter at %04lx", priv->smba);
err = i2c_add_adapter(&priv->adapter);
if (err) {
i801_acpi_remove(priv);
return err;
}
/*
* Enable Host Notify for chips that supports it.
* It is done after i2c_add_adapter() so that we are sure the work queue
* is not used if i2c_add_adapter() fails.
*/
err = i801_enable_host_notify(&priv->adapter);
if (err && err != -ENOTSUPP)
dev_warn(&dev->dev, "Unable to enable SMBus Host Notify\n");
i801_probe_optional_slaves(priv);
/* We ignore errors - multiplexing is optional */
i801_add_mux(priv);
pci_set_drvdata(dev, priv);
pm_runtime_set_autosuspend_delay(&dev->dev, 1000);
pm_runtime_use_autosuspend(&dev->dev);
pm_runtime_put_autosuspend(&dev->dev);
pm_runtime_allow(&dev->dev);
return 0;
}
static void i801_remove(struct pci_dev *dev)
{
struct i801_priv *priv = pci_get_drvdata(dev);
pm_runtime_forbid(&dev->dev);
pm_runtime_get_noresume(&dev->dev);
i801_del_mux(priv);
i2c_del_adapter(&priv->adapter);
i801_acpi_remove(priv);
pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);
platform_device_unregister(priv->tco_pdev);
/*
* do not call pci_disable_device(dev) since it can cause hard hangs on
* some systems during power-off (eg. Fujitsu-Siemens Lifebook E8010)
*/
}
#ifdef CONFIG_PM
static int i801_suspend(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct i801_priv *priv = pci_get_drvdata(pci_dev);
pci_write_config_byte(pci_dev, SMBHSTCFG, priv->original_hstcfg);
return 0;
}
static int i801_resume(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct i801_priv *priv = pci_get_drvdata(pci_dev);
int err;
err = i801_enable_host_notify(&priv->adapter);
if (err && err != -ENOTSUPP)
dev_warn(dev, "Unable to enable SMBus Host Notify\n");
return 0;
}
#endif
static UNIVERSAL_DEV_PM_OPS(i801_pm_ops, i801_suspend,
i801_resume, NULL);
static struct pci_driver i801_driver = {
.name = "i801_smbus",
.id_table = i801_ids,
.probe = i801_probe,
.remove = i801_remove,
.driver = {
.pm = &i801_pm_ops,
},
};
static int __init i2c_i801_init(void)
{
if (dmi_name_in_vendors("FUJITSU"))
input_apanel_init();
return pci_register_driver(&i801_driver);
}
static void __exit i2c_i801_exit(void)
{
pci_unregister_driver(&i801_driver);
}
MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>, Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("I801 SMBus driver");
MODULE_LICENSE("GPL");
module_init(i2c_i801_init);
module_exit(i2c_i801_exit);
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