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_VERSION("1.06"); 21 MODULE_ALIAS("xillybus_of"); 22 MODULE_LICENSE("GPL v2"); 23 24 static const char xillyname[] = "xillybus_of"; 25 26 /* Match table for of_platform binding */ 27 static const struct of_device_id xillybus_of_match[] = { 28 { .compatible = "xillybus,xillybus-1.00.a", }, 29 { .compatible = "xlnx,xillybus-1.00.a", }, /* Deprecated */ 30 {} 31 }; 32 33 MODULE_DEVICE_TABLE(of, xillybus_of_match); 34 35 static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep, 36 dma_addr_t dma_handle, 37 size_t size, 38 int direction) 39 { 40 dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction); 41 } 42 43 static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep, 44 dma_addr_t dma_handle, 45 size_t size, 46 int direction) 47 { 48 dma_sync_single_for_device(ep->dev, dma_handle, size, direction); 49 } 50 51 static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep, 52 dma_addr_t dma_handle, 53 size_t size, 54 int direction) 55 { 56 } 57 58 static void xilly_of_unmap(void *ptr) 59 { 60 struct xilly_mapping *data = ptr; 61 62 dma_unmap_single(data->device, data->dma_addr, 63 data->size, data->direction); 64 65 kfree(ptr); 66 } 67 68 static int xilly_map_single_of(struct xilly_endpoint *ep, 69 void *ptr, 70 size_t size, 71 int direction, 72 dma_addr_t *ret_dma_handle 73 ) 74 { 75 dma_addr_t addr; 76 struct xilly_mapping *this; 77 78 this = kzalloc(sizeof(*this), GFP_KERNEL); 79 if (!this) 80 return -ENOMEM; 81 82 addr = dma_map_single(ep->dev, ptr, size, direction); 83 84 if (dma_mapping_error(ep->dev, addr)) { 85 kfree(this); 86 return -ENODEV; 87 } 88 89 this->device = ep->dev; 90 this->dma_addr = addr; 91 this->size = size; 92 this->direction = direction; 93 94 *ret_dma_handle = addr; 95 96 return devm_add_action_or_reset(ep->dev, xilly_of_unmap, this); 97 } 98 99 static struct xilly_endpoint_hardware of_hw = { 100 .owner = THIS_MODULE, 101 .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of, 102 .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of, 103 .map_single = xilly_map_single_of, 104 }; 105 106 static struct xilly_endpoint_hardware of_hw_coherent = { 107 .owner = THIS_MODULE, 108 .hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop, 109 .hw_sync_sgl_for_device = xilly_dma_sync_single_nop, 110 .map_single = xilly_map_single_of, 111 }; 112 113 static int xilly_drv_probe(struct platform_device *op) 114 { 115 struct device *dev = &op->dev; 116 struct xilly_endpoint *endpoint; 117 int rc; 118 int irq; 119 struct xilly_endpoint_hardware *ephw = &of_hw; 120 121 if (of_property_read_bool(dev->of_node, "dma-coherent")) 122 ephw = &of_hw_coherent; 123 124 endpoint = xillybus_init_endpoint(NULL, dev, ephw); 125 126 if (!endpoint) 127 return -ENOMEM; 128 129 dev_set_drvdata(dev, endpoint); 130 131 endpoint->registers = devm_platform_ioremap_resource(op, 0); 132 if (IS_ERR(endpoint->registers)) 133 return PTR_ERR(endpoint->registers); 134 135 irq = platform_get_irq(op, 0); 136 137 rc = devm_request_irq(dev, irq, xillybus_isr, 0, xillyname, endpoint); 138 139 if (rc) { 140 dev_err(endpoint->dev, 141 "Failed to register IRQ handler. Aborting.\n"); 142 return -ENODEV; 143 } 144 145 return xillybus_endpoint_discovery(endpoint); 146 } 147 148 static int xilly_drv_remove(struct platform_device *op) 149 { 150 struct device *dev = &op->dev; 151 struct xilly_endpoint *endpoint = dev_get_drvdata(dev); 152 153 xillybus_endpoint_remove(endpoint); 154 155 return 0; 156 } 157 158 static struct platform_driver xillybus_platform_driver = { 159 .probe = xilly_drv_probe, 160 .remove = xilly_drv_remove, 161 .driver = { 162 .name = xillyname, 163 .of_match_table = xillybus_of_match, 164 }, 165 }; 166 167 module_platform_driver(xillybus_platform_driver); 168