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e809c22b JN |
1 | /* |
2 | * Copyright (C) 2007 Google, Inc. | |
3 | * Copyright (C) 2011 Intel, Inc. | |
4 | * Copyright (C) 2013 Intel, Inc. | |
5 | * | |
6 | * This software is licensed under the terms of the GNU General Public | |
7 | * License version 2, as published by the Free Software Foundation, and | |
8 | * may be copied, distributed, and modified under those terms. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/irq.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/io.h> | |
24 | ||
25 | #define PDEV_BUS_OP_DONE (0x00) | |
26 | #define PDEV_BUS_OP_REMOVE_DEV (0x04) | |
27 | #define PDEV_BUS_OP_ADD_DEV (0x08) | |
28 | ||
29 | #define PDEV_BUS_OP_INIT (0x00) | |
30 | ||
31 | #define PDEV_BUS_OP (0x00) | |
32 | #define PDEV_BUS_GET_NAME (0x04) | |
33 | #define PDEV_BUS_NAME_LEN (0x08) | |
34 | #define PDEV_BUS_ID (0x0c) | |
35 | #define PDEV_BUS_IO_BASE (0x10) | |
36 | #define PDEV_BUS_IO_SIZE (0x14) | |
37 | #define PDEV_BUS_IRQ (0x18) | |
38 | #define PDEV_BUS_IRQ_COUNT (0x1c) | |
f10d8434 | 39 | #define PDEV_BUS_GET_NAME_HIGH (0x20) |
e809c22b JN |
40 | |
41 | struct pdev_bus_dev { | |
42 | struct list_head list; | |
43 | struct platform_device pdev; | |
44 | struct resource resources[0]; | |
45 | }; | |
46 | ||
47 | static void goldfish_pdev_worker(struct work_struct *work); | |
48 | ||
49 | static void __iomem *pdev_bus_base; | |
50 | static unsigned long pdev_bus_addr; | |
51 | static unsigned long pdev_bus_len; | |
52 | static u32 pdev_bus_irq; | |
53 | static LIST_HEAD(pdev_bus_new_devices); | |
54 | static LIST_HEAD(pdev_bus_registered_devices); | |
55 | static LIST_HEAD(pdev_bus_removed_devices); | |
56 | static DECLARE_WORK(pdev_bus_worker, goldfish_pdev_worker); | |
57 | ||
58 | ||
59 | static void goldfish_pdev_worker(struct work_struct *work) | |
60 | { | |
61 | int ret; | |
62 | struct pdev_bus_dev *pos, *n; | |
63 | ||
64 | list_for_each_entry_safe(pos, n, &pdev_bus_removed_devices, list) { | |
65 | list_del(&pos->list); | |
66 | platform_device_unregister(&pos->pdev); | |
67 | kfree(pos); | |
68 | } | |
69 | list_for_each_entry_safe(pos, n, &pdev_bus_new_devices, list) { | |
70 | list_del(&pos->list); | |
71 | ret = platform_device_register(&pos->pdev); | |
72 | if (ret) | |
73 | pr_err("goldfish_pdev_worker failed to register device, %s\n", | |
74 | pos->pdev.name); | |
75 | list_add_tail(&pos->list, &pdev_bus_registered_devices); | |
76 | } | |
77 | } | |
78 | ||
79 | static void goldfish_pdev_remove(void) | |
80 | { | |
81 | struct pdev_bus_dev *pos, *n; | |
82 | u32 base; | |
83 | ||
84 | base = readl(pdev_bus_base + PDEV_BUS_IO_BASE); | |
85 | ||
86 | list_for_each_entry_safe(pos, n, &pdev_bus_new_devices, list) { | |
87 | if (pos->resources[0].start == base) { | |
88 | list_del(&pos->list); | |
89 | kfree(pos); | |
90 | return; | |
91 | } | |
92 | } | |
93 | list_for_each_entry_safe(pos, n, &pdev_bus_registered_devices, list) { | |
94 | if (pos->resources[0].start == base) { | |
95 | list_del(&pos->list); | |
96 | list_add_tail(&pos->list, &pdev_bus_removed_devices); | |
97 | schedule_work(&pdev_bus_worker); | |
98 | return; | |
99 | } | |
100 | }; | |
101 | pr_err("goldfish_pdev_remove could not find device at %x\n", base); | |
102 | } | |
103 | ||
104 | static int goldfish_new_pdev(void) | |
105 | { | |
106 | struct pdev_bus_dev *dev; | |
107 | u32 name_len; | |
108 | u32 irq = -1, irq_count; | |
109 | int resource_count = 2; | |
110 | u32 base; | |
111 | char *name; | |
112 | ||
113 | base = readl(pdev_bus_base + PDEV_BUS_IO_BASE); | |
114 | ||
115 | irq_count = readl(pdev_bus_base + PDEV_BUS_IRQ_COUNT); | |
116 | name_len = readl(pdev_bus_base + PDEV_BUS_NAME_LEN); | |
117 | if (irq_count) | |
118 | resource_count++; | |
119 | ||
120 | dev = kzalloc(sizeof(*dev) + | |
121 | sizeof(struct resource) * resource_count + | |
122 | name_len + 1 + sizeof(*dev->pdev.dev.dma_mask), GFP_ATOMIC); | |
123 | if (dev == NULL) | |
124 | return -ENOMEM; | |
125 | ||
126 | dev->pdev.num_resources = resource_count; | |
127 | dev->pdev.resource = (struct resource *)(dev + 1); | |
128 | dev->pdev.name = name = (char *)(dev->pdev.resource + resource_count); | |
129 | dev->pdev.dev.coherent_dma_mask = ~0; | |
130 | dev->pdev.dev.dma_mask = (void *)(dev->pdev.name + name_len + 1); | |
131 | *dev->pdev.dev.dma_mask = ~0; | |
132 | ||
f10d8434 OP |
133 | #ifdef CONFIG_64BIT |
134 | writel((u32)((u64)name>>32), pdev_bus_base + PDEV_BUS_GET_NAME_HIGH); | |
135 | #endif | |
f2dbdf62 | 136 | writel((u32)(unsigned long)name, pdev_bus_base + PDEV_BUS_GET_NAME); |
e809c22b JN |
137 | name[name_len] = '\0'; |
138 | dev->pdev.id = readl(pdev_bus_base + PDEV_BUS_ID); | |
139 | dev->pdev.resource[0].start = base; | |
140 | dev->pdev.resource[0].end = base + | |
141 | readl(pdev_bus_base + PDEV_BUS_IO_SIZE) - 1; | |
142 | dev->pdev.resource[0].flags = IORESOURCE_MEM; | |
143 | if (irq_count) { | |
144 | irq = readl(pdev_bus_base + PDEV_BUS_IRQ); | |
145 | dev->pdev.resource[1].start = irq; | |
146 | dev->pdev.resource[1].end = irq + irq_count - 1; | |
147 | dev->pdev.resource[1].flags = IORESOURCE_IRQ; | |
148 | } | |
149 | ||
150 | pr_debug("goldfish_new_pdev %s at %x irq %d\n", name, base, irq); | |
151 | list_add_tail(&dev->list, &pdev_bus_new_devices); | |
152 | schedule_work(&pdev_bus_worker); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static irqreturn_t goldfish_pdev_bus_interrupt(int irq, void *dev_id) | |
158 | { | |
159 | irqreturn_t ret = IRQ_NONE; | |
160 | while (1) { | |
161 | u32 op = readl(pdev_bus_base + PDEV_BUS_OP); | |
162 | switch (op) { | |
163 | case PDEV_BUS_OP_DONE: | |
164 | return IRQ_NONE; | |
165 | ||
166 | case PDEV_BUS_OP_REMOVE_DEV: | |
167 | goldfish_pdev_remove(); | |
168 | break; | |
169 | ||
170 | case PDEV_BUS_OP_ADD_DEV: | |
171 | goldfish_new_pdev(); | |
172 | break; | |
173 | } | |
174 | ret = IRQ_HANDLED; | |
175 | } | |
176 | return ret; | |
177 | } | |
178 | ||
179 | static int goldfish_pdev_bus_probe(struct platform_device *pdev) | |
180 | { | |
181 | int ret; | |
182 | struct resource *r; | |
183 | ||
184 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
185 | if (r == NULL) | |
186 | return -EINVAL; | |
187 | ||
188 | pdev_bus_addr = r->start; | |
189 | pdev_bus_len = resource_size(r); | |
190 | ||
e809c22b JN |
191 | pdev_bus_base = ioremap(pdev_bus_addr, pdev_bus_len); |
192 | if (pdev_bus_base == NULL) { | |
193 | ret = -ENOMEM; | |
194 | dev_err(&pdev->dev, "unable to map Goldfish MMIO.\n"); | |
195 | goto free_resources; | |
196 | } | |
197 | ||
198 | r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
199 | if (r == NULL) { | |
200 | ret = -ENOENT; | |
201 | goto free_map; | |
202 | } | |
203 | ||
204 | pdev_bus_irq = r->start; | |
205 | ||
206 | ret = request_irq(pdev_bus_irq, goldfish_pdev_bus_interrupt, | |
207 | IRQF_SHARED, "goldfish_pdev_bus", pdev); | |
208 | if (ret) { | |
209 | dev_err(&pdev->dev, "unable to request Goldfish IRQ\n"); | |
210 | goto free_map; | |
211 | } | |
212 | ||
213 | writel(PDEV_BUS_OP_INIT, pdev_bus_base + PDEV_BUS_OP); | |
214 | return 0; | |
215 | ||
216 | free_map: | |
217 | iounmap(pdev_bus_base); | |
218 | free_resources: | |
219 | release_mem_region(pdev_bus_addr, pdev_bus_len); | |
220 | return ret; | |
221 | } | |
222 | ||
223 | static int goldfish_pdev_bus_remove(struct platform_device *pdev) | |
224 | { | |
225 | iounmap(pdev_bus_base); | |
226 | free_irq(pdev_bus_irq, pdev); | |
227 | release_mem_region(pdev_bus_addr, pdev_bus_len); | |
228 | return 0; | |
229 | } | |
230 | ||
231 | static struct platform_driver goldfish_pdev_bus_driver = { | |
232 | .probe = goldfish_pdev_bus_probe, | |
233 | .remove = goldfish_pdev_bus_remove, | |
234 | .driver = { | |
235 | .name = "goldfish_pdev_bus" | |
236 | } | |
237 | }; | |
238 | ||
239 | module_platform_driver(goldfish_pdev_bus_driver); |