1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/misc/xillybus_of.c 4 * 5 * Copyright 2011 Xillybus Ltd, http://xillybus.com 6 * 7 * Driver for the Xillybus FPGA/host framework using Open Firmware. 8 */ 9 10 #include <linux/module.h> 11 #include <linux/device.h> 12 #include <linux/slab.h> 13 #include <linux/platform_device.h> 14 #include <linux/of.h> 15 #include <linux/err.h> 16 #include "xillybus.h" 17 18 MODULE_DESCRIPTION("Xillybus driver for Open Firmware"); 19 MODULE_AUTHOR("Eli Billauer, Xillybus Ltd."); 20 MODULE_ALIAS("xillybus_of"); 21 MODULE_LICENSE("GPL v2"); 22 23 static const char xillyname[] = "xillybus_of"; 24 25 /* Match table for of_platform binding */ 26 static const struct of_device_id xillybus_of_match[] = { 27 { .compatible = "xillybus,xillybus-1.00.a", }, 28 { .compatible = "xlnx,xillybus-1.00.a", }, /* Deprecated */ 29 {} 30 }; 31 32 MODULE_DEVICE_TABLE(of, xillybus_of_match); 33 34 static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep, 35 dma_addr_t dma_handle, 36 size_t size, 37 int direction) 38 { 39 dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction); 40 } 41 42 static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep, 43 dma_addr_t dma_handle, 44 size_t size, 45 int direction) 46 { 47 dma_sync_single_for_device(ep->dev, dma_handle, size, direction); 48 } 49 50 static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep, 51 dma_addr_t dma_handle, 52 size_t size, 53 int direction) 54 { 55 } 56 57 static void xilly_of_unmap(void *ptr) 58 { 59 struct xilly_mapping *data = ptr; 60 61 dma_unmap_single(data->device, data->dma_addr, 62 data->size, data->direction); 63 64 kfree(ptr); 65 } 66 67 static int xilly_map_single_of(struct xilly_endpoint *ep, 68 void *ptr, 69 size_t size, 70 int direction, 71 dma_addr_t *ret_dma_handle 72 ) 73 { 74 dma_addr_t addr; 75 struct xilly_mapping *this; 76 77 this = kzalloc(sizeof(*this), GFP_KERNEL); 78 if (!this) 79 return -ENOMEM; 80 81 addr = dma_map_single(ep->dev, ptr, size, direction); 82 83 if (dma_mapping_error(ep->dev, addr)) { 84 kfree(this); 85 return -ENODEV; 86 } 87 88 this->device = ep->dev; 89 this->dma_addr = addr; 90 this->size = size; 91 this->direction = direction; 92 93 *ret_dma_handle = addr; 94 95 return devm_add_action_or_reset(ep->dev, xilly_of_unmap, this); 96 } 97 98 static struct xilly_endpoint_hardware of_hw = { 99 .owner = THIS_MODULE, 100 .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of, 101 .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of, 102 .map_single = xilly_map_single_of, 103 }; 104 105 static struct xilly_endpoint_hardware of_hw_coherent = { 106 .owner = THIS_MODULE, 107 .hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop, 108 .hw_sync_sgl_for_device = xilly_dma_sync_single_nop, 109 .map_single = xilly_map_single_of, 110 }; 111 112 static int xilly_drv_probe(struct platform_device *op) 113 { 114 struct device *dev = &op->dev; 115 struct xilly_endpoint *endpoint; 116 int rc; 117 int irq; 118 struct xilly_endpoint_hardware *ephw = &of_hw; 119 120 if (of_property_read_bool(dev->of_node, "dma-coherent")) 121 ephw = &of_hw_coherent; 122 123 endpoint = xillybus_init_endpoint(NULL, dev, ephw); 124 125 if (!endpoint) 126 return -ENOMEM; 127 128 dev_set_drvdata(dev, endpoint); 129 130 endpoint->registers = devm_platform_ioremap_resource(op, 0); 131 if (IS_ERR(endpoint->registers)) 132 return PTR_ERR(endpoint->registers); 133 134 irq = platform_get_irq(op, 0); 135 136 rc = devm_request_irq(dev, irq, xillybus_isr, 0, xillyname, endpoint); 137 138 if (rc) { 139 dev_err(endpoint->dev, 140 "Failed to register IRQ handler. Aborting.\n"); 141 return -ENODEV; 142 } 143 144 return xillybus_endpoint_discovery(endpoint); 145 } 146 147 static int xilly_drv_remove(struct platform_device *op) 148 { 149 struct device *dev = &op->dev; 150 struct xilly_endpoint *endpoint = dev_get_drvdata(dev); 151 152 xillybus_endpoint_remove(endpoint); 153 154 return 0; 155 } 156 157 static struct platform_driver xillybus_platform_driver = { 158 .probe = xilly_drv_probe, 159 .remove = xilly_drv_remove, 160 .driver = { 161 .name = xillyname, 162 .of_match_table = xillybus_of_match, 163 }, 164 }; 165 166 module_platform_driver(xillybus_platform_driver); 167