i2c: thunderx: Add SMBUS alert support
Add SMBUS alert interrupt support. For now only device tree is
supported for specifying the alert. In case of ACPI an error
is returned.
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/drivers/i2c/busses/i2c-thunderx-pcidrv.c b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
index 0dcebe2..e8c3ce0 100644
--- a/drivers/i2c/busses/i2c-thunderx-pcidrv.c
+++ b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
@@ -14,9 +14,11 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/i2c.h>
+#include <linux/i2c-smbus.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/of_irq.h>
#include <linux/pci.h>
#include "i2c-octeon-core.h"
@@ -107,6 +109,44 @@
clk_put(clk);
}
+static int thunder_i2c_smbus_setup_of(struct octeon_i2c *i2c,
+ struct device_node *node)
+{
+ u32 type;
+
+ if (!node)
+ return -EINVAL;
+
+ i2c->alert_data.irq = irq_of_parse_and_map(node, 0);
+ if (!i2c->alert_data.irq)
+ return -EINVAL;
+
+ type = irqd_get_trigger_type(irq_get_irq_data(i2c->alert_data.irq));
+ i2c->alert_data.alert_edge_triggered =
+ (type & IRQ_TYPE_LEVEL_MASK) ? 1 : 0;
+
+ i2c->ara = i2c_setup_smbus_alert(&i2c->adap, &i2c->alert_data);
+ if (!i2c->ara)
+ return -ENODEV;
+ return 0;
+}
+
+static int thunder_i2c_smbus_setup(struct octeon_i2c *i2c,
+ struct device_node *node)
+{
+ /* TODO: ACPI support */
+ if (!acpi_disabled)
+ return -EOPNOTSUPP;
+
+ return thunder_i2c_smbus_setup_of(i2c, node);
+}
+
+static void thunder_i2c_smbus_remove(struct octeon_i2c *i2c)
+{
+ if (i2c->ara)
+ i2c_unregister_device(i2c->ara);
+}
+
static int thunder_i2c_probe_pci(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@@ -173,6 +213,11 @@
goto error;
dev_info(i2c->dev, "Probed. Set system clock to %u\n", i2c->sys_freq);
+
+ ret = thunder_i2c_smbus_setup(i2c, pdev->dev.of_node);
+ if (ret)
+ dev_info(dev, "SMBUS alert not active on this bus\n");
+
return 0;
error:
@@ -184,6 +229,7 @@
{
struct octeon_i2c *i2c = pci_get_drvdata(pdev);
+ thunder_i2c_smbus_remove(i2c);
thunder_i2c_clock_disable(&pdev->dev, i2c->clk);
i2c_del_adapter(&i2c->adap);
}