diff options
Diffstat (limited to 'drivers/char/xillybus/xillybus_of.c')
| -rw-r--r-- | drivers/char/xillybus/xillybus_of.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/char/xillybus/xillybus_of.c b/drivers/char/xillybus/xillybus_of.c new file mode 100644 index 000000000..781865084 --- /dev/null +++ b/drivers/char/xillybus/xillybus_of.c @@ -0,0 +1,186 @@ +/* + * linux/drivers/misc/xillybus_of.c + * + * Copyright 2011 Xillybus Ltd, http://xillybus.com + * + * Driver for the Xillybus FPGA/host framework using Open Firmware. + * + * This program is free software; you can redistribute it and/or modify + * it under the smems of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + */ + +#include <linux/module.h> +#include <linux/device.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/of_platform.h> +#include <linux/err.h> +#include "xillybus.h" + +MODULE_DESCRIPTION("Xillybus driver for Open Firmware"); +MODULE_AUTHOR("Eli Billauer, Xillybus Ltd."); +MODULE_VERSION("1.06"); +MODULE_ALIAS("xillybus_of"); +MODULE_LICENSE("GPL v2"); + +static const char xillyname[] = "xillybus_of"; + +/* Match table for of_platform binding */ +static const struct of_device_id xillybus_of_match[] = { + { .compatible = "xillybus,xillybus-1.00.a", }, + { .compatible = "xlnx,xillybus-1.00.a", }, /* Deprecated */ + {} +}; + +MODULE_DEVICE_TABLE(of, xillybus_of_match); + +static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep, + dma_addr_t dma_handle, + size_t size, + int direction) +{ + dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction); +} + +static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep, + dma_addr_t dma_handle, + size_t size, + int direction) +{ + dma_sync_single_for_device(ep->dev, dma_handle, size, direction); +} + +static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep, + dma_addr_t dma_handle, + size_t size, + int direction) +{ +} + +static void xilly_of_unmap(void *ptr) +{ + struct xilly_mapping *data = ptr; + + dma_unmap_single(data->device, data->dma_addr, + data->size, data->direction); + + kfree(ptr); +} + +static int xilly_map_single_of(struct xilly_endpoint *ep, + void *ptr, + size_t size, + int direction, + dma_addr_t *ret_dma_handle + ) +{ + dma_addr_t addr; + struct xilly_mapping *this; + int rc; + + this = kzalloc(sizeof(*this), GFP_KERNEL); + if (!this) + return -ENOMEM; + + addr = dma_map_single(ep->dev, ptr, size, direction); + + if (dma_mapping_error(ep->dev, addr)) { + kfree(this); + return -ENODEV; + } + + this->device = ep->dev; + this->dma_addr = addr; + this->size = size; + this->direction = direction; + + *ret_dma_handle = addr; + + rc = devm_add_action(ep->dev, xilly_of_unmap, this); + + if (rc) { + dma_unmap_single(ep->dev, addr, size, direction); + kfree(this); + return rc; + } + + return 0; +} + +static struct xilly_endpoint_hardware of_hw = { + .owner = THIS_MODULE, + .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of, + .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of, + .map_single = xilly_map_single_of, +}; + +static struct xilly_endpoint_hardware of_hw_coherent = { + .owner = THIS_MODULE, + .hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop, + .hw_sync_sgl_for_device = xilly_dma_sync_single_nop, + .map_single = xilly_map_single_of, +}; + +static int xilly_drv_probe(struct platform_device *op) +{ + struct device *dev = &op->dev; + struct xilly_endpoint *endpoint; + int rc; + int irq; + struct resource res; + struct xilly_endpoint_hardware *ephw = &of_hw; + + if (of_property_read_bool(dev->of_node, "dma-coherent")) + ephw = &of_hw_coherent; + + endpoint = xillybus_init_endpoint(NULL, dev, ephw); + + if (!endpoint) + return -ENOMEM; + + dev_set_drvdata(dev, endpoint); + + rc = of_address_to_resource(dev->of_node, 0, &res); + endpoint->registers = devm_ioremap_resource(dev, &res); + + if (IS_ERR(endpoint->registers)) + return PTR_ERR(endpoint->registers); + + irq = irq_of_parse_and_map(dev->of_node, 0); + + rc = devm_request_irq(dev, irq, xillybus_isr, 0, xillyname, endpoint); + + if (rc) { + dev_err(endpoint->dev, + "Failed to register IRQ handler. Aborting.\n"); + return -ENODEV; + } + + return xillybus_endpoint_discovery(endpoint); +} + +static int xilly_drv_remove(struct platform_device *op) +{ + struct device *dev = &op->dev; + struct xilly_endpoint *endpoint = dev_get_drvdata(dev); + + xillybus_endpoint_remove(endpoint); + + return 0; +} + +static struct platform_driver xillybus_platform_driver = { + .probe = xilly_drv_probe, + .remove = xilly_drv_remove, + .driver = { + .name = xillyname, + .of_match_table = xillybus_of_match, + }, +}; + +module_platform_driver(xillybus_platform_driver); |