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author | Grant Likely <grant.likely@secretlab.ca> | 2011-06-21 10:59:34 -0600 |
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committer | Grant Likely <grant.likely@secretlab.ca> | 2011-06-21 11:02:37 -0600 |
commit | 5de1540b7bc4c23470f86add1e517be41e7fefe2 (patch) | |
tree | a1c18d1ec0b7009966f114565424e9bbb31da1c1 /drivers/of | |
parent | 29d4f8a4974aacf46b028fa92f9dd3ffdba3e614 (diff) | |
download | linux-5de1540b7bc4c23470f86add1e517be41e7fefe2.tar.gz linux-5de1540b7bc4c23470f86add1e517be41e7fefe2.tar.xz |
drivers/amba: create devices from device tree
Add a function to create amba_devices (i.e. primecell peripherals)
from device tree nodes. The device tree scanning is done by the
of_platform_populate() function which can call of_amba_device_create
based on a match table entry.
Nodes with a "arm,primecell-periphid" property can override the h/w
peripheral id value.
Based on the original work by Jeremy Kerr.
Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
[grant.likely: add Jeremy's original s-o-b line, changes from review
comments, and moved all code to drivers/of/platform.c]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/of')
-rw-r--r-- | drivers/of/platform.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/of/platform.c b/drivers/of/platform.c index 1f4a5d3af76e..4192ddc62638 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -13,6 +13,7 @@ */ #include <linux/errno.h> #include <linux/module.h> +#include <linux/amba/bus.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/slab.h> @@ -217,6 +218,71 @@ struct platform_device *of_platform_device_create(struct device_node *np, } EXPORT_SYMBOL(of_platform_device_create); +#ifdef CONFIG_ARM_AMBA +static struct amba_device *of_amba_device_create(struct device_node *node, + const char *bus_id, + void *platform_data, + struct device *parent) +{ + struct amba_device *dev; + const void *prop; + int i, ret; + + pr_debug("Creating amba device %s\n", node->full_name); + + if (!of_device_is_available(node)) + return NULL; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return NULL; + + /* setup generic device info */ + dev->dev.coherent_dma_mask = ~0; + dev->dev.of_node = of_node_get(node); + dev->dev.parent = parent; + dev->dev.platform_data = platform_data; + if (bus_id) + dev_set_name(&dev->dev, "%s", bus_id); + else + of_device_make_bus_id(&dev->dev); + + /* setup amba-specific device info */ + dev->dma_mask = ~0; + + /* Allow the HW Peripheral ID to be overridden */ + prop = of_get_property(node, "arm,primecell-periphid", NULL); + if (prop) + dev->periphid = of_read_ulong(prop, 1); + + /* Decode the IRQs and address ranges */ + for (i = 0; i < AMBA_NR_IRQS; i++) + dev->irq[i] = irq_of_parse_and_map(node, i); + + ret = of_address_to_resource(node, 0, &dev->res); + if (ret) + goto err_free; + + ret = amba_device_register(dev, &iomem_resource); + if (ret) + goto err_free; + + return dev; + +err_free: + kfree(dev); + return NULL; +} +#else /* CONFIG_ARM_AMBA */ +static struct amba_device *of_amba_device_create(struct device_node *node, + const char *bus_id, + void *platform_data, + struct device *parent) +{ + return NULL; +} +#endif /* CONFIG_ARM_AMBA */ + /** * of_platform_bus_create() - Create a device for a node and its children. * @bus: device node of the bus to instantiate @@ -242,6 +308,11 @@ static int of_platform_bus_create(struct device_node *bus, return 0; } + if (of_device_is_compatible(bus, "arm,primecell")) { + of_amba_device_create(bus, NULL, NULL, parent); + return 0; + } + dev = of_platform_device_create(bus, NULL, parent); if (!dev || !of_match_node(matches, bus)) return 0; |