From de1d815fccee1f4766a7e56054ab0ec3f6f3a7db Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 7 Jan 2006 14:54:15 +0000 Subject: [ARM] Move AMBA bus code to drivers/amba/ Make the AMBA bus code visible to other architectures. Signed-off-by: Russell King --- arch/arm/common/Makefile | 1 - arch/arm/common/amba.c | 359 ----------------------------------------------- drivers/Makefile | 1 + drivers/amba/Makefile | 2 + drivers/amba/bus.c | 359 +++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 362 insertions(+), 360 deletions(-) delete mode 100644 arch/arm/common/amba.c create mode 100644 drivers/amba/Makefile create mode 100644 drivers/amba/bus.c diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile index 2685051b3013..ec8d17c96906 100644 --- a/arch/arm/common/Makefile +++ b/arch/arm/common/Makefile @@ -3,7 +3,6 @@ # obj-y += rtctime.o -obj-$(CONFIG_ARM_AMBA) += amba.o obj-$(CONFIG_ARM_GIC) += gic.o obj-$(CONFIG_ICST525) += icst525.o obj-$(CONFIG_ICST307) += icst307.o diff --git a/arch/arm/common/amba.c b/arch/arm/common/amba.c deleted file mode 100644 index 1bbdd1693d57..000000000000 --- a/arch/arm/common/amba.c +++ /dev/null @@ -1,359 +0,0 @@ -/* - * linux/arch/arm/common/amba.c - * - * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#include -#include -#include -#include -#include -#include - -#include -#include -#include - -#define to_amba_device(d) container_of(d, struct amba_device, dev) -#define to_amba_driver(d) container_of(d, struct amba_driver, drv) - -static struct amba_id * -amba_lookup(struct amba_id *table, struct amba_device *dev) -{ - int ret = 0; - - while (table->mask) { - ret = (dev->periphid & table->mask) == table->id; - if (ret) - break; - table++; - } - - return ret ? table : NULL; -} - -static int amba_match(struct device *dev, struct device_driver *drv) -{ - struct amba_device *pcdev = to_amba_device(dev); - struct amba_driver *pcdrv = to_amba_driver(drv); - - return amba_lookup(pcdrv->id_table, pcdev) != NULL; -} - -#ifdef CONFIG_HOTPLUG -static int amba_uevent(struct device *dev, char **envp, int nr_env, char *buf, int bufsz) -{ - struct amba_device *pcdev = to_amba_device(dev); - - if (nr_env < 2) - return -ENOMEM; - - snprintf(buf, bufsz, "AMBA_ID=%08x", pcdev->periphid); - *envp++ = buf; - *envp++ = NULL; - return 0; -} -#else -#define amba_uevent NULL -#endif - -static int amba_suspend(struct device *dev, pm_message_t state) -{ - struct amba_driver *drv = to_amba_driver(dev->driver); - int ret = 0; - - if (dev->driver && drv->suspend) - ret = drv->suspend(to_amba_device(dev), state); - return ret; -} - -static int amba_resume(struct device *dev) -{ - struct amba_driver *drv = to_amba_driver(dev->driver); - int ret = 0; - - if (dev->driver && drv->resume) - ret = drv->resume(to_amba_device(dev)); - return ret; -} - -/* - * Primecells are part of the Advanced Microcontroller Bus Architecture, - * so we call the bus "amba". - */ -static struct bus_type amba_bustype = { - .name = "amba", - .match = amba_match, - .uevent = amba_uevent, - .suspend = amba_suspend, - .resume = amba_resume, -}; - -static int __init amba_init(void) -{ - return bus_register(&amba_bustype); -} - -postcore_initcall(amba_init); - -/* - * These are the device model conversion veneers; they convert the - * device model structures to our more specific structures. - */ -static int amba_probe(struct device *dev) -{ - struct amba_device *pcdev = to_amba_device(dev); - struct amba_driver *pcdrv = to_amba_driver(dev->driver); - struct amba_id *id; - - id = amba_lookup(pcdrv->id_table, pcdev); - - return pcdrv->probe(pcdev, id); -} - -static int amba_remove(struct device *dev) -{ - struct amba_driver *drv = to_amba_driver(dev->driver); - return drv->remove(to_amba_device(dev)); -} - -static void amba_shutdown(struct device *dev) -{ - struct amba_driver *drv = to_amba_driver(dev->driver); - drv->shutdown(to_amba_device(dev)); -} - -/** - * amba_driver_register - register an AMBA device driver - * @drv: amba device driver structure - * - * Register an AMBA device driver with the Linux device model - * core. If devices pre-exist, the drivers probe function will - * be called. - */ -int amba_driver_register(struct amba_driver *drv) -{ - drv->drv.bus = &amba_bustype; - -#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn - SETFN(probe); - SETFN(remove); - SETFN(shutdown); - - return driver_register(&drv->drv); -} - -/** - * amba_driver_unregister - remove an AMBA device driver - * @drv: AMBA device driver structure to remove - * - * Unregister an AMBA device driver from the Linux device - * model. The device model will call the drivers remove function - * for each device the device driver is currently handling. - */ -void amba_driver_unregister(struct amba_driver *drv) -{ - driver_unregister(&drv->drv); -} - - -static void amba_device_release(struct device *dev) -{ - struct amba_device *d = to_amba_device(dev); - - if (d->res.parent) - release_resource(&d->res); - kfree(d); -} - -#define amba_attr(name,fmt,arg...) \ -static ssize_t show_##name(struct device *_dev, struct device_attribute *attr, char *buf) \ -{ \ - struct amba_device *dev = to_amba_device(_dev); \ - return sprintf(buf, fmt, arg); \ -} \ -static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) - -amba_attr(id, "%08x\n", dev->periphid); -amba_attr(irq0, "%u\n", dev->irq[0]); -amba_attr(irq1, "%u\n", dev->irq[1]); -amba_attr(resource, "\t%08lx\t%08lx\t%08lx\n", - dev->res.start, dev->res.end, dev->res.flags); - -/** - * amba_device_register - register an AMBA device - * @dev: AMBA device to register - * @parent: parent memory resource - * - * Setup the AMBA device, reading the cell ID if present. - * Claim the resource, and register the AMBA device with - * the Linux device manager. - */ -int amba_device_register(struct amba_device *dev, struct resource *parent) -{ - u32 pid, cid; - void __iomem *tmp; - int i, ret; - - dev->dev.release = amba_device_release; - dev->dev.bus = &amba_bustype; - dev->dev.dma_mask = &dev->dma_mask; - dev->res.name = dev->dev.bus_id; - - if (!dev->dev.coherent_dma_mask && dev->dma_mask) - dev_warn(&dev->dev, "coherent dma mask is unset\n"); - - ret = request_resource(parent, &dev->res); - if (ret == 0) { - tmp = ioremap(dev->res.start, SZ_4K); - if (!tmp) { - ret = -ENOMEM; - goto out; - } - - for (pid = 0, i = 0; i < 4; i++) - pid |= (readl(tmp + 0xfe0 + 4 * i) & 255) << (i * 8); - for (cid = 0, i = 0; i < 4; i++) - cid |= (readl(tmp + 0xff0 + 4 * i) & 255) << (i * 8); - - iounmap(tmp); - - if (cid == 0xb105f00d) - dev->periphid = pid; - - if (dev->periphid) - ret = device_register(&dev->dev); - else - ret = -ENODEV; - - if (ret == 0) { - device_create_file(&dev->dev, &dev_attr_id); - if (dev->irq[0] != NO_IRQ) - device_create_file(&dev->dev, &dev_attr_irq0); - if (dev->irq[1] != NO_IRQ) - device_create_file(&dev->dev, &dev_attr_irq1); - device_create_file(&dev->dev, &dev_attr_resource); - } else { - out: - release_resource(&dev->res); - } - } - return ret; -} - -/** - * amba_device_unregister - unregister an AMBA device - * @dev: AMBA device to remove - * - * Remove the specified AMBA device from the Linux device - * manager. All files associated with this object will be - * destroyed, and device drivers notified that the device has - * been removed. The AMBA device's resources including - * the amba_device structure will be freed once all - * references to it have been dropped. - */ -void amba_device_unregister(struct amba_device *dev) -{ - device_unregister(&dev->dev); -} - - -struct find_data { - struct amba_device *dev; - struct device *parent; - const char *busid; - unsigned int id; - unsigned int mask; -}; - -static int amba_find_match(struct device *dev, void *data) -{ - struct find_data *d = data; - struct amba_device *pcdev = to_amba_device(dev); - int r; - - r = (pcdev->periphid & d->mask) == d->id; - if (d->parent) - r &= d->parent == dev->parent; - if (d->busid) - r &= strcmp(dev->bus_id, d->busid) == 0; - - if (r) { - get_device(dev); - d->dev = pcdev; - } - - return r; -} - -/** - * amba_find_device - locate an AMBA device given a bus id - * @busid: bus id for device (or NULL) - * @parent: parent device (or NULL) - * @id: peripheral ID (or 0) - * @mask: peripheral ID mask (or 0) - * - * Return the AMBA device corresponding to the supplied parameters. - * If no device matches, returns NULL. - * - * NOTE: When a valid device is found, its refcount is - * incremented, and must be decremented before the returned - * reference. - */ -struct amba_device * -amba_find_device(const char *busid, struct device *parent, unsigned int id, - unsigned int mask) -{ - struct find_data data; - - data.dev = NULL; - data.parent = parent; - data.busid = busid; - data.id = id; - data.mask = mask; - - bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); - - return data.dev; -} - -/** - * amba_request_regions - request all mem regions associated with device - * @dev: amba_device structure for device - * @name: name, or NULL to use driver name - */ -int amba_request_regions(struct amba_device *dev, const char *name) -{ - int ret = 0; - - if (!name) - name = dev->dev.driver->name; - - if (!request_mem_region(dev->res.start, SZ_4K, name)) - ret = -EBUSY; - - return ret; -} - -/** - * amba_release_regions - release mem regions assoicated with device - * @dev: amba_device structure for device - * - * Release regions claimed by a successful call to amba_request_regions. - */ -void amba_release_regions(struct amba_device *dev) -{ - release_mem_region(dev->res.start, SZ_4K); -} - -EXPORT_SYMBOL(amba_driver_register); -EXPORT_SYMBOL(amba_driver_unregister); -EXPORT_SYMBOL(amba_device_register); -EXPORT_SYMBOL(amba_device_unregister); -EXPORT_SYMBOL(amba_find_device); -EXPORT_SYMBOL(amba_request_regions); -EXPORT_SYMBOL(amba_release_regions); diff --git a/drivers/Makefile b/drivers/Makefile index ea410b6b7644..7fc3f0f08b29 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_ACPI) += acpi/ # PnP must come after ACPI since it will eventually need to check if acpi # was used and do nothing if so obj-$(CONFIG_PNP) += pnp/ +obj-$(CONFIG_ARM_AMBA) += amba/ # char/ comes before serial/ etc so that the VT console is the boot-time # default. diff --git a/drivers/amba/Makefile b/drivers/amba/Makefile new file mode 100644 index 000000000000..40fe74097be2 --- /dev/null +++ b/drivers/amba/Makefile @@ -0,0 +1,2 @@ +obj-y += bus.o + diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c new file mode 100644 index 000000000000..1bbdd1693d57 --- /dev/null +++ b/drivers/amba/bus.c @@ -0,0 +1,359 @@ +/* + * linux/arch/arm/common/amba.c + * + * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define to_amba_device(d) container_of(d, struct amba_device, dev) +#define to_amba_driver(d) container_of(d, struct amba_driver, drv) + +static struct amba_id * +amba_lookup(struct amba_id *table, struct amba_device *dev) +{ + int ret = 0; + + while (table->mask) { + ret = (dev->periphid & table->mask) == table->id; + if (ret) + break; + table++; + } + + return ret ? table : NULL; +} + +static int amba_match(struct device *dev, struct device_driver *drv) +{ + struct amba_device *pcdev = to_amba_device(dev); + struct amba_driver *pcdrv = to_amba_driver(drv); + + return amba_lookup(pcdrv->id_table, pcdev) != NULL; +} + +#ifdef CONFIG_HOTPLUG +static int amba_uevent(struct device *dev, char **envp, int nr_env, char *buf, int bufsz) +{ + struct amba_device *pcdev = to_amba_device(dev); + + if (nr_env < 2) + return -ENOMEM; + + snprintf(buf, bufsz, "AMBA_ID=%08x", pcdev->periphid); + *envp++ = buf; + *envp++ = NULL; + return 0; +} +#else +#define amba_uevent NULL +#endif + +static int amba_suspend(struct device *dev, pm_message_t state) +{ + struct amba_driver *drv = to_amba_driver(dev->driver); + int ret = 0; + + if (dev->driver && drv->suspend) + ret = drv->suspend(to_amba_device(dev), state); + return ret; +} + +static int amba_resume(struct device *dev) +{ + struct amba_driver *drv = to_amba_driver(dev->driver); + int ret = 0; + + if (dev->driver && drv->resume) + ret = drv->resume(to_amba_device(dev)); + return ret; +} + +/* + * Primecells are part of the Advanced Microcontroller Bus Architecture, + * so we call the bus "amba". + */ +static struct bus_type amba_bustype = { + .name = "amba", + .match = amba_match, + .uevent = amba_uevent, + .suspend = amba_suspend, + .resume = amba_resume, +}; + +static int __init amba_init(void) +{ + return bus_register(&amba_bustype); +} + +postcore_initcall(amba_init); + +/* + * These are the device model conversion veneers; they convert the + * device model structures to our more specific structures. + */ +static int amba_probe(struct device *dev) +{ + struct amba_device *pcdev = to_amba_device(dev); + struct amba_driver *pcdrv = to_amba_driver(dev->driver); + struct amba_id *id; + + id = amba_lookup(pcdrv->id_table, pcdev); + + return pcdrv->probe(pcdev, id); +} + +static int amba_remove(struct device *dev) +{ + struct amba_driver *drv = to_amba_driver(dev->driver); + return drv->remove(to_amba_device(dev)); +} + +static void amba_shutdown(struct device *dev) +{ + struct amba_driver *drv = to_amba_driver(dev->driver); + drv->shutdown(to_amba_device(dev)); +} + +/** + * amba_driver_register - register an AMBA device driver + * @drv: amba device driver structure + * + * Register an AMBA device driver with the Linux device model + * core. If devices pre-exist, the drivers probe function will + * be called. + */ +int amba_driver_register(struct amba_driver *drv) +{ + drv->drv.bus = &amba_bustype; + +#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn + SETFN(probe); + SETFN(remove); + SETFN(shutdown); + + return driver_register(&drv->drv); +} + +/** + * amba_driver_unregister - remove an AMBA device driver + * @drv: AMBA device driver structure to remove + * + * Unregister an AMBA device driver from the Linux device + * model. The device model will call the drivers remove function + * for each device the device driver is currently handling. + */ +void amba_driver_unregister(struct amba_driver *drv) +{ + driver_unregister(&drv->drv); +} + + +static void amba_device_release(struct device *dev) +{ + struct amba_device *d = to_amba_device(dev); + + if (d->res.parent) + release_resource(&d->res); + kfree(d); +} + +#define amba_attr(name,fmt,arg...) \ +static ssize_t show_##name(struct device *_dev, struct device_attribute *attr, char *buf) \ +{ \ + struct amba_device *dev = to_amba_device(_dev); \ + return sprintf(buf, fmt, arg); \ +} \ +static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) + +amba_attr(id, "%08x\n", dev->periphid); +amba_attr(irq0, "%u\n", dev->irq[0]); +amba_attr(irq1, "%u\n", dev->irq[1]); +amba_attr(resource, "\t%08lx\t%08lx\t%08lx\n", + dev->res.start, dev->res.end, dev->res.flags); + +/** + * amba_device_register - register an AMBA device + * @dev: AMBA device to register + * @parent: parent memory resource + * + * Setup the AMBA device, reading the cell ID if present. + * Claim the resource, and register the AMBA device with + * the Linux device manager. + */ +int amba_device_register(struct amba_device *dev, struct resource *parent) +{ + u32 pid, cid; + void __iomem *tmp; + int i, ret; + + dev->dev.release = amba_device_release; + dev->dev.bus = &amba_bustype; + dev->dev.dma_mask = &dev->dma_mask; + dev->res.name = dev->dev.bus_id; + + if (!dev->dev.coherent_dma_mask && dev->dma_mask) + dev_warn(&dev->dev, "coherent dma mask is unset\n"); + + ret = request_resource(parent, &dev->res); + if (ret == 0) { + tmp = ioremap(dev->res.start, SZ_4K); + if (!tmp) { + ret = -ENOMEM; + goto out; + } + + for (pid = 0, i = 0; i < 4; i++) + pid |= (readl(tmp + 0xfe0 + 4 * i) & 255) << (i * 8); + for (cid = 0, i = 0; i < 4; i++) + cid |= (readl(tmp + 0xff0 + 4 * i) & 255) << (i * 8); + + iounmap(tmp); + + if (cid == 0xb105f00d) + dev->periphid = pid; + + if (dev->periphid) + ret = device_register(&dev->dev); + else + ret = -ENODEV; + + if (ret == 0) { + device_create_file(&dev->dev, &dev_attr_id); + if (dev->irq[0] != NO_IRQ) + device_create_file(&dev->dev, &dev_attr_irq0); + if (dev->irq[1] != NO_IRQ) + device_create_file(&dev->dev, &dev_attr_irq1); + device_create_file(&dev->dev, &dev_attr_resource); + } else { + out: + release_resource(&dev->res); + } + } + return ret; +} + +/** + * amba_device_unregister - unregister an AMBA device + * @dev: AMBA device to remove + * + * Remove the specified AMBA device from the Linux device + * manager. All files associated with this object will be + * destroyed, and device drivers notified that the device has + * been removed. The AMBA device's resources including + * the amba_device structure will be freed once all + * references to it have been dropped. + */ +void amba_device_unregister(struct amba_device *dev) +{ + device_unregister(&dev->dev); +} + + +struct find_data { + struct amba_device *dev; + struct device *parent; + const char *busid; + unsigned int id; + unsigned int mask; +}; + +static int amba_find_match(struct device *dev, void *data) +{ + struct find_data *d = data; + struct amba_device *pcdev = to_amba_device(dev); + int r; + + r = (pcdev->periphid & d->mask) == d->id; + if (d->parent) + r &= d->parent == dev->parent; + if (d->busid) + r &= strcmp(dev->bus_id, d->busid) == 0; + + if (r) { + get_device(dev); + d->dev = pcdev; + } + + return r; +} + +/** + * amba_find_device - locate an AMBA device given a bus id + * @busid: bus id for device (or NULL) + * @parent: parent device (or NULL) + * @id: peripheral ID (or 0) + * @mask: peripheral ID mask (or 0) + * + * Return the AMBA device corresponding to the supplied parameters. + * If no device matches, returns NULL. + * + * NOTE: When a valid device is found, its refcount is + * incremented, and must be decremented before the returned + * reference. + */ +struct amba_device * +amba_find_device(const char *busid, struct device *parent, unsigned int id, + unsigned int mask) +{ + struct find_data data; + + data.dev = NULL; + data.parent = parent; + data.busid = busid; + data.id = id; + data.mask = mask; + + bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); + + return data.dev; +} + +/** + * amba_request_regions - request all mem regions associated with device + * @dev: amba_device structure for device + * @name: name, or NULL to use driver name + */ +int amba_request_regions(struct amba_device *dev, const char *name) +{ + int ret = 0; + + if (!name) + name = dev->dev.driver->name; + + if (!request_mem_region(dev->res.start, SZ_4K, name)) + ret = -EBUSY; + + return ret; +} + +/** + * amba_release_regions - release mem regions assoicated with device + * @dev: amba_device structure for device + * + * Release regions claimed by a successful call to amba_request_regions. + */ +void amba_release_regions(struct amba_device *dev) +{ + release_mem_region(dev->res.start, SZ_4K); +} + +EXPORT_SYMBOL(amba_driver_register); +EXPORT_SYMBOL(amba_driver_unregister); +EXPORT_SYMBOL(amba_device_register); +EXPORT_SYMBOL(amba_device_unregister); +EXPORT_SYMBOL(amba_find_device); +EXPORT_SYMBOL(amba_request_regions); +EXPORT_SYMBOL(amba_release_regions); -- cgit v1.2.2