From: Jan Glauber jglauber@cavium.com
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 Signed-off-by: Vadim Lomovtsev Vadim.Lomovtsev@caviumnetworks.com --- drivers/i2c/busses/Kconfig | 1 + drivers/i2c/busses/i2c-octeon-core.h | 3 +++ drivers/i2c/busses/i2c-thunderx-pcidrv.c | 46 ++++++++++++++++++++++++++++++++ 3 files changed, 50 insertions(+)
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 19387ee..5678a73 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -956,6 +956,7 @@ 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. diff --git a/drivers/i2c/busses/i2c-octeon-core.h b/drivers/i2c/busses/i2c-octeon-core.h index 33c7e1f..2ed6f7a 100644 --- a/drivers/i2c/busses/i2c-octeon-core.h +++ b/drivers/i2c/busses/i2c-octeon-core.h @@ -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) 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 @@ 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); }