| 1 | /* |
| 2 | * arch/ubicom32/mach-common/ring_tio.c |
| 3 | * Generic initialization for UIO Ubicom32 Ring |
| 4 | * |
| 5 | * (C) Copyright 2009, Ubicom, Inc. |
| 6 | * |
| 7 | * This file is part of the Ubicom32 Linux Kernel Port. |
| 8 | * |
| 9 | * The Ubicom32 Linux Kernel Port is free software: you can redistribute |
| 10 | * it and/or modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation, either version 2 of the |
| 12 | * License, or (at your option) any later version. |
| 13 | * |
| 14 | * The Ubicom32 Linux Kernel Port is distributed in the hope that it |
| 15 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 16 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 17 | * the GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with the Ubicom32 Linux Kernel Port. If not, |
| 21 | * see <http://www.gnu.org/licenses/>. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/types.h> |
| 26 | |
| 27 | #include <asm/devtree.h> |
| 28 | #include <asm/ring_tio.h> |
| 29 | |
| 30 | static const char *ring_tio_driver_name = "uio_ubicom32ring"; |
| 31 | |
| 32 | /* |
| 33 | * The number of ring_tio's currently allocated, used for .id |
| 34 | */ |
| 35 | static int __initdata ring_tio_count; |
| 36 | |
| 37 | /* |
| 38 | * The maximum number of resources that the ring_tio will have. |
| 39 | * Currently 3, a register space, and up to 2 interrupts. |
| 40 | */ |
| 41 | #define RING_TIO_MAX_RESOURCES 3 |
| 42 | |
| 43 | /* |
| 44 | * ring_tio_init |
| 45 | * Checks the device tree and instantiates the driver if found |
| 46 | */ |
| 47 | void __init ring_tio_init(const char *node_name) |
| 48 | { |
| 49 | struct platform_device *pdev; |
| 50 | struct resource *res; |
| 51 | int resource_idx = 0; |
| 52 | struct ring_tio_node *ring_node; |
| 53 | |
| 54 | /* |
| 55 | * Check the device tree for the ring_tio |
| 56 | */ |
| 57 | ring_node = (struct ring_tio_node *)devtree_find_node(node_name); |
| 58 | if (!ring_node) { |
| 59 | printk(KERN_WARNING "Ring TIO '%s' not found\n", node_name); |
| 60 | return; |
| 61 | } |
| 62 | |
| 63 | if (ring_node->version != RING_TIO_NODE_VERSION) { |
| 64 | printk(KERN_WARNING "ring_tio not compatible\n"); |
| 65 | return; |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * Dynamically create the platform_device structure and resources |
| 70 | */ |
| 71 | pdev = kzalloc(sizeof(struct platform_device), GFP_KERNEL); |
| 72 | if (!pdev) { |
| 73 | printk(KERN_WARNING "ring_tio could not alloc pdev\n"); |
| 74 | return; |
| 75 | } |
| 76 | |
| 77 | res = kzalloc(sizeof(struct resource) * RING_TIO_MAX_RESOURCES, |
| 78 | GFP_KERNEL); |
| 79 | if (!res) { |
| 80 | kfree(pdev); |
| 81 | printk(KERN_WARNING "ring_tio could not alloc res\n"); |
| 82 | return; |
| 83 | } |
| 84 | |
| 85 | pdev->name = ring_tio_driver_name; |
| 86 | pdev->id = ring_tio_count++; |
| 87 | pdev->resource = res; |
| 88 | |
| 89 | /* |
| 90 | * Fill in the resources and platform data from devtree information |
| 91 | */ |
| 92 | res[resource_idx].start = (u32_t)(ring_node->regs); |
| 93 | res[resource_idx].end = (u32_t)(ring_node->regs); |
| 94 | res[resource_idx].flags = IORESOURCE_MEM; |
| 95 | resource_idx++; |
| 96 | |
| 97 | if (ring_node->dn.sendirq != 0xFF) { |
| 98 | res[resource_idx].start = ring_node->dn.sendirq; |
| 99 | res[resource_idx].flags = IORESOURCE_IRQ; |
| 100 | resource_idx++; |
| 101 | } |
| 102 | |
| 103 | if (ring_node->dn.recvirq != 0xFF) { |
| 104 | res[resource_idx].start = ring_node->dn.recvirq; |
| 105 | res[resource_idx].flags = IORESOURCE_IRQ; |
| 106 | resource_idx++; |
| 107 | } |
| 108 | pdev->num_resources = resource_idx; |
| 109 | |
| 110 | printk(KERN_INFO "RingTIO.%d '%s' found irq=%d/%d regs=%p pdev=%p/%p\n", |
| 111 | ring_tio_count - 1, node_name, ring_node->dn.sendirq, |
| 112 | ring_node->dn.recvirq, ring_node->regs, pdev, res); |
| 113 | |
| 114 | /* |
| 115 | * Try to get the device registered |
| 116 | */ |
| 117 | pdev->dev.platform_data = (void *)node_name; |
| 118 | if (platform_device_register(pdev) < 0) { |
| 119 | printk(KERN_WARNING "Ring failed to register\n"); |
| 120 | kfree(pdev); |
| 121 | kfree(res); |
| 122 | } |
| 123 | } |
| 124 | |
