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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>
hifive-unleashed-5.1
Jan Glauber 2016-08-24 23:25:45 +02:00 committed by Wolfram Sang
parent 22d40209de
commit 1e5866711a
3 changed files with 50 additions and 0 deletions
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1
drivers/i2c/busses/Kconfig
View File

@ -959,6 +959,7 @@ config I2C_OCTEON
config I2C_THUNDERX
tristate "Cavium ThunderX I2C bus support"
depends on 64BIT && PCI && (ARM64 || COMPILE_TEST)
select I2C_SMBUS
help
Say yes if you want to support the I2C serial bus on Cavium
ThunderX SOC.

3
drivers/i2c/busses/i2c-octeon-core.h
View File

@ -3,6 +3,7 @@
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/i2c-smbus.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/pci.h>
@ -119,6 +120,8 @@ struct octeon_i2c {
#if IS_ENABLED(CONFIG_I2C_THUNDERX)
struct msix_entry i2c_msix;
#endif
struct i2c_smbus_alert_setup alert_data;
struct i2c_client *ara;
};
static inline void octeon_i2c_writeq_flush(u64 val, void __iomem *addr)

46
drivers/i2c/busses/i2c-thunderx-pcidrv.c
View File

@ -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 @@ static void thunder_i2c_clock_disable(struct device *dev, struct clk *clk)
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 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
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 @@ static void thunder_i2c_remove_pci(struct pci_dev *pdev)
{
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);
}