* 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/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/platform_data/itco_wdt.h>
#include <linux/pm_runtime.h>
-#if (defined CONFIG_I2C_MUX_GPIO || defined CONFIG_I2C_MUX_GPIO_MODULE) && \
- defined CONFIG_DMI
+#if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
#include <linux/gpio.h>
#include <linux/i2c-mux-gpio.h>
#endif
#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
/* 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
#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)
int len;
u8 *data;
-#if (defined CONFIG_I2C_MUX_GPIO || defined CONFIG_I2C_MUX_GPIO_MODULE) && \
- defined CONFIG_DMI
+#if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
const struct i801_mux_config *mux_drvdata;
struct platform_device *mux_pdev;
#endif
*/
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)
"Block process call",
"I2C block read",
"Interrupt",
+ "SMBus Host Notify",
};
static unsigned int disable_features;
"\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 ");
+ "\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. */
}
}
+ /*
+ * 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;
}
dev_err(&priv->pci_dev->dev, "Transaction failed\n");
}
if (status & SMBHSTSTS_DEV_ERR) {
- result = -ENXIO;
- dev_dbg(&priv->pci_dev->dev, "No response\n");
+ /*
+ * 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;
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 two kinds of interrupts:
+ * There are three kinds of interrupts:
*
* 1) i801 signals transaction completion with one of these interrupts:
* INTR - Success
*
* 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)
{
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);
status &= SMBHSTSTS_INTR | STATUS_ERROR_FLAGS;
if (status) {
outb_p(status, SMBHSTSTS(priv));
- priv->status |= status;
+ priv->status = status;
wake_up(&priv->waitq);
}
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);
+ 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 = {
static void i801_probe_optional_slaves(struct i801_priv *priv) {}
#endif /* CONFIG_X86 && CONFIG_DMI */
-#if (defined CONFIG_I2C_MUX_GPIO || defined CONFIG_I2C_MUX_GPIO_MODULE) && \
- defined 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 },
priv->features |= FEATURE_SMBUS_PEC;
priv->features |= FEATURE_BLOCK_BUFFER;
priv->features |= FEATURE_TCO;
+ priv->features |= FEATURE_HOST_NOTIFY;
break;
case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0:
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:
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);
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
projects / cascardo / linux.git / blobdiff