diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-ibm_iic.c | 187 |
2 files changed, 187 insertions, 2 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 51de2ccc1519..1577bcad288a 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -246,7 +246,7 @@ config I2C_PIIX4 config I2C_IBM_IIC tristate "IBM PPC 4xx on-chip I2C interface" - depends on IBM_OCP + depends on 4xx help Say Y here if you want to use IIC peripheral found on embedded IBM PPC 4xx based systems. diff --git a/drivers/i2c/busses/i2c-ibm_iic.c b/drivers/i2c/busses/i2c-ibm_iic.c index b330a0c9a6a5..85dbf34382e1 100644 --- a/drivers/i2c/busses/i2c-ibm_iic.c +++ b/drivers/i2c/busses/i2c-ibm_iic.c @@ -6,6 +6,9 @@ * Copyright (c) 2003, 2004 Zultys Technologies. * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> * + * Copyright (c) 2008 PIKA Technologies + * Sean MacLennan <smaclennan@pikatech.com> + * * Based on original work by * Ian DaSilva <idasilva@mvista.com> * Armin Kuster <akuster@mvista.com> @@ -39,12 +42,17 @@ #include <asm/io.h> #include <linux/i2c.h> #include <linux/i2c-id.h> + +#ifdef CONFIG_IBM_OCP #include <asm/ocp.h> #include <asm/ibm4xx.h> +#else +#include <linux/of_platform.h> +#endif #include "i2c-ibm_iic.h" -#define DRIVER_VERSION "2.1" +#define DRIVER_VERSION "2.2" MODULE_DESCRIPTION("IBM IIC driver v" DRIVER_VERSION); MODULE_LICENSE("GPL"); @@ -657,6 +665,7 @@ static inline u8 iic_clckdiv(unsigned int opb) return (u8)((opb + 9) / 10 - 1); } +#ifdef CONFIG_IBM_OCP /* * Register single IIC interface */ @@ -828,5 +837,181 @@ static void __exit iic_exit(void) ocp_unregister_driver(&ibm_iic_driver); } +#else /* !CONFIG_IBM_OCP */ + +static int __devinit iic_request_irq(struct of_device *ofdev, + struct ibm_iic_private *dev) +{ + struct device_node *np = ofdev->node; + int irq; + + if (iic_force_poll) + return NO_IRQ; + + irq = irq_of_parse_and_map(np, 0); + if (irq == NO_IRQ) { + dev_err(&ofdev->dev, "irq_of_parse_and_map failed\n"); + return NO_IRQ; + } + + /* Disable interrupts until we finish initialization, assumes + * level-sensitive IRQ setup... + */ + iic_interrupt_mode(dev, 0); + if (request_irq(irq, iic_handler, 0, "IBM IIC", dev)) { + dev_err(&ofdev->dev, "request_irq %d failed\n", irq); + /* Fallback to the polling mode */ + return NO_IRQ; + } + + return irq; +} + +/* + * Register single IIC interface + */ +static int __devinit iic_probe(struct of_device *ofdev, + const struct of_device_id *match) +{ + struct device_node *np = ofdev->node; + struct ibm_iic_private *dev; + struct i2c_adapter *adap; + const u32 *indexp, *freq; + int ret; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) { + dev_err(&ofdev->dev, "failed to allocate device data\n"); + return -ENOMEM; + } + + dev_set_drvdata(&ofdev->dev, dev); + + indexp = of_get_property(np, "index", NULL); + if (!indexp) { + dev_err(&ofdev->dev, "no index specified\n"); + ret = -EINVAL; + goto error_cleanup; + } + dev->idx = *indexp; + + dev->vaddr = of_iomap(np, 0); + if (dev->vaddr == NULL) { + dev_err(&ofdev->dev, "failed to iomap device\n"); + ret = -ENXIO; + goto error_cleanup; + } + + init_waitqueue_head(&dev->wq); + + dev->irq = iic_request_irq(ofdev, dev); + if (dev->irq == NO_IRQ) + dev_warn(&ofdev->dev, "using polling mode\n"); + + /* Board specific settings */ + if (iic_force_fast || of_get_property(np, "fast-mode", NULL)) + dev->fast_mode = 1; + + freq = of_get_property(np, "clock-frequency", NULL); + if (freq == NULL) { + freq = of_get_property(np->parent, "clock-frequency", NULL); + if (freq == NULL) { + dev_err(&ofdev->dev, "Unable to get bus frequency\n"); + ret = -EINVAL; + goto error_cleanup; + } + } + + dev->clckdiv = iic_clckdiv(*freq); + dev_dbg(&ofdev->dev, "clckdiv = %d\n", dev->clckdiv); + + /* Initialize IIC interface */ + iic_dev_init(dev); + + /* Register it with i2c layer */ + adap = &dev->adap; + adap->dev.parent = &ofdev->dev; + strlcpy(adap->name, "IBM IIC", sizeof(adap->name)); + i2c_set_adapdata(adap, dev); + adap->id = I2C_HW_OCP; + adap->class = I2C_CLASS_HWMON; + adap->algo = &iic_algo; + adap->timeout = 1; + adap->nr = dev->idx; + + ret = i2c_add_numbered_adapter(adap); + if (ret < 0) { + dev_err(&ofdev->dev, "failed to register i2c adapter\n"); + goto error_cleanup; + } + + dev_info(&ofdev->dev, "using %s mode\n", + dev->fast_mode ? "fast (400 kHz)" : "standard (100 kHz)"); + + return 0; + +error_cleanup: + if (dev->irq != NO_IRQ) { + iic_interrupt_mode(dev, 0); + free_irq(dev->irq, dev); + } + + if (dev->vaddr) + iounmap(dev->vaddr); + + dev_set_drvdata(&ofdev->dev, NULL); + kfree(dev); + return ret; +} + +/* + * Cleanup initialized IIC interface + */ +static int __devexit iic_remove(struct of_device *ofdev) +{ + struct ibm_iic_private *dev = dev_get_drvdata(&ofdev->dev); + + dev_set_drvdata(&ofdev->dev, NULL); + + i2c_del_adapter(&dev->adap); + + if (dev->irq != NO_IRQ) { + iic_interrupt_mode(dev, 0); + free_irq(dev->irq, dev); + } + + iounmap(dev->vaddr); + kfree(dev); + + return 0; +} + +static const struct of_device_id ibm_iic_match[] = { + { .compatible = "ibm,iic-405ex", }, + { .compatible = "ibm,iic-405gp", }, + { .compatible = "ibm,iic-440gp", }, + { .compatible = "ibm,iic-440gpx", }, + { .compatible = "ibm,iic-440grx", }, + {} +}; + +static struct of_platform_driver ibm_iic_driver = { + .name = "ibm-iic", + .match_table = ibm_iic_match, + .probe = iic_probe, + .remove = __devexit_p(iic_remove), +}; + +static int __init iic_init(void) +{ + return of_register_platform_driver(&ibm_iic_driver); +} + +static void __exit iic_exit(void) +{ + of_unregister_platform_driver(&ibm_iic_driver); +} +#endif /* CONFIG_IBM_OCP */ + module_init(iic_init); module_exit(iic_exit); |