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i2c: i801: Add Block Write-Block Read Process Call support

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Add SMBUS 2.0 Block Write-Block Read Process Call command support.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Alexander Sverdlin 2019-06-18 17:06:50 +00:00 committed by Wolfram Sang
parent 79b4499524
commit 315cd67c94
2 changed files with 38 additions and 7 deletions
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2
Documentation/i2c/busses/i2c-i801
View File

@ -88,7 +88,7 @@ SMBus controller.
Process Call Support
--------------------
Not supported.
Block process call is supported on the 82801EB (ICH5) and later chips.
I2C Block Read Support

43
drivers/i2c/busses/i2c-i801.c
View File

@ -77,7 +77,7 @@
* Software PEC no
* Hardware PEC yes
* Block buffer yes
* Block process call transaction no
* Block process call transaction yes
* I2C block read transaction yes (doesn't use the block buffer)
* Slave mode no
* SMBus Host Notify yes
@ -178,6 +178,7 @@
#define I801_PROC_CALL 0x10 /* unimplemented */
#define I801_BLOCK_DATA 0x14
#define I801_I2C_BLOCK_DATA 0x18 /* ICH5 and later */
#define I801_BLOCK_PROC_CALL 0x1C
/* I801 Host Control register bits */
#define SMBHSTCNT_INTREN BIT(0)
@ -518,10 +519,23 @@ static int i801_transaction(struct i801_priv *priv, int xact)
static int i801_block_transaction_by_block(struct i801_priv *priv,
union i2c_smbus_data *data,
char read_write, int hwpec)
char read_write, int command,
int hwpec)
{
int i, len;
int status;
int xact = hwpec ? SMBHSTCNT_PEC_EN : 0;
switch (command) {
case I2C_SMBUS_BLOCK_PROC_CALL:
xact |= I801_BLOCK_PROC_CALL;
break;
case I2C_SMBUS_BLOCK_DATA:
xact |= I801_BLOCK_DATA;
break;
default:
return -EOPNOTSUPP;
}
inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
@ -533,12 +547,12 @@ static int i801_block_transaction_by_block(struct i801_priv *priv,
outb_p(data->block[i+1], SMBBLKDAT(priv));
}
status = i801_transaction(priv, I801_BLOCK_DATA |
(hwpec ? SMBHSTCNT_PEC_EN : 0));
status = i801_transaction(priv, xact);
if (status)
return status;
if (read_write == I2C_SMBUS_READ) {
if (read_write == I2C_SMBUS_READ ||
command == I2C_SMBUS_BLOCK_PROC_CALL) {
len = inb_p(SMBHSTDAT0(priv));
if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
return -EPROTO;
@ -676,6 +690,9 @@ static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
int result;
const struct i2c_adapter *adap = &priv->adapter;
if (command == I2C_SMBUS_BLOCK_PROC_CALL)
return -EOPNOTSUPP;
result = i801_check_pre(priv);
if (result < 0)
return result;
@ -807,7 +824,8 @@ static int i801_block_transaction(struct i801_priv *priv,
&& command != I2C_SMBUS_I2C_BLOCK_DATA
&& i801_set_block_buffer_mode(priv) == 0)
result = i801_block_transaction_by_block(priv, data,
read_write, hwpec);
read_write,
command, hwpec);
else
result = i801_block_transaction_byte_by_byte(priv, data,
read_write,
@ -899,6 +917,15 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
outb_p(command, SMBHSTCMD(priv));
block = 1;
break;
case I2C_SMBUS_BLOCK_PROC_CALL:
/*
* Bit 0 of the slave address register always indicate a write
* command.
*/
outb_p((addr & 0x7f) << 1, SMBHSTADD(priv));
outb_p(command, SMBHSTCMD(priv));
block = 1;
break;
default:
dev_err(&priv->pci_dev->dev, "Unsupported transaction %d\n",
size);
@ -959,6 +986,8 @@ static u32 i801_func(struct i2c_adapter *adapter)
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_BLOCK_PROC) ?
I2C_FUNC_SMBUS_BLOCK_PROC_CALL : 0) |
((priv->features & FEATURE_I2C_BLOCK_READ) ?
I2C_FUNC_SMBUS_READ_I2C_BLOCK : 0) |
((priv->features & FEATURE_HOST_NOTIFY) ?
@ -1654,6 +1683,7 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
case PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS:
case PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS:
case PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS:
priv->features |= FEATURE_BLOCK_PROC;
priv->features |= FEATURE_I2C_BLOCK_READ;
priv->features |= FEATURE_IRQ;
priv->features |= FEATURE_SMBUS_PEC;
@ -1673,6 +1703,7 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
priv->features |= FEATURE_IDF;
/* fall through */
default:
priv->features |= FEATURE_BLOCK_PROC;
priv->features |= FEATURE_I2C_BLOCK_READ;
priv->features |= FEATURE_IRQ;
/* fall through */