Commit | Line | Data |
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b54f2863 BN |
1 | /* |
2 | * UIO SMX Cryptengine driver. | |
3 | * | |
4 | * (C) 2008 Nias Digital P/L <bn@niasdigital.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/device.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/uio_driver.h> | |
16 | #include <linux/io.h> | |
17 | ||
18 | #define DRV_NAME "smx-ce" | |
19 | #define DRV_VERSION "0.03" | |
20 | ||
21 | #define SMX_CSR 0x00000000 | |
22 | #define SMX_EnD 0x00000001 | |
23 | #define SMX_RUN 0x00000002 | |
24 | #define SMX_DRDY 0x00000004 | |
25 | #define SMX_ERR 0x00000008 | |
26 | ||
27 | static irqreturn_t smx_handler(int irq, struct uio_info *dev_info) | |
28 | { | |
29 | void __iomem *csr = dev_info->mem[0].internal_addr + SMX_CSR; | |
30 | ||
31 | u32 status = ioread32(csr); | |
32 | ||
33 | if (!(status & SMX_DRDY)) | |
34 | return IRQ_NONE; | |
35 | ||
36 | /* Disable interrupt */ | |
37 | iowrite32(status & ~SMX_DRDY, csr); | |
38 | return IRQ_HANDLED; | |
39 | } | |
40 | ||
41 | static int __devinit smx_ce_probe(struct platform_device *dev) | |
42 | { | |
43 | ||
44 | int ret = -ENODEV; | |
45 | struct uio_info *info; | |
46 | struct resource *regs; | |
47 | ||
48 | info = kzalloc(sizeof(struct uio_info), GFP_KERNEL); | |
49 | if (!info) | |
50 | return -ENOMEM; | |
51 | ||
52 | regs = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
53 | if (!regs) { | |
54 | dev_err(&dev->dev, "No memory resource specified\n"); | |
55 | goto out_free; | |
56 | } | |
57 | ||
58 | info->mem[0].addr = regs->start; | |
59 | if (!info->mem[0].addr) { | |
60 | dev_err(&dev->dev, "Invalid memory resource\n"); | |
61 | goto out_free; | |
62 | } | |
63 | ||
64 | info->mem[0].size = regs->end - regs->start + 1; | |
65 | info->mem[0].internal_addr = ioremap(regs->start, info->mem[0].size); | |
66 | ||
67 | if (!info->mem[0].internal_addr) { | |
68 | dev_err(&dev->dev, "Can't remap memory address range\n"); | |
69 | goto out_free; | |
70 | } | |
71 | ||
72 | info->mem[0].memtype = UIO_MEM_PHYS; | |
73 | ||
74 | info->name = "smx-ce"; | |
75 | info->version = "0.03"; | |
76 | ||
77 | info->irq = platform_get_irq(dev, 0); | |
78 | if (info->irq < 0) { | |
79 | ret = info->irq; | |
80 | dev_err(&dev->dev, "No (or invalid) IRQ resource specified\n"); | |
81 | goto out_unmap; | |
82 | } | |
83 | ||
84 | info->irq_flags = IRQF_SHARED; | |
85 | info->handler = smx_handler; | |
86 | ||
87 | platform_set_drvdata(dev, info); | |
88 | ||
89 | ret = uio_register_device(&dev->dev, info); | |
90 | ||
91 | if (ret) | |
92 | goto out_unmap; | |
93 | ||
94 | return 0; | |
95 | ||
96 | out_unmap: | |
97 | iounmap(info->mem[0].internal_addr); | |
98 | out_free: | |
99 | kfree(info); | |
100 | ||
101 | return ret; | |
102 | } | |
103 | ||
104 | static int __devexit smx_ce_remove(struct platform_device *dev) | |
105 | { | |
106 | struct uio_info *info = platform_get_drvdata(dev); | |
107 | ||
108 | uio_unregister_device(info); | |
109 | platform_set_drvdata(dev, NULL); | |
110 | iounmap(info->mem[0].internal_addr); | |
111 | ||
112 | kfree(info); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static struct platform_driver smx_ce_driver = { | |
118 | .probe = smx_ce_probe, | |
119 | .remove = __devexit_p(smx_ce_remove), | |
120 | .driver = { | |
121 | .name = DRV_NAME, | |
122 | .owner = THIS_MODULE, | |
123 | }, | |
124 | }; | |
125 | ||
126 | static int __init smx_ce_init_module(void) | |
127 | { | |
128 | return platform_driver_register(&smx_ce_driver); | |
129 | } | |
130 | module_init(smx_ce_init_module); | |
131 | ||
132 | static void __exit smx_ce_exit_module(void) | |
133 | { | |
134 | platform_driver_unregister(&smx_ce_driver); | |
135 | } | |
136 | module_exit(smx_ce_exit_module); | |
137 | ||
138 | MODULE_LICENSE("GPL v2"); | |
139 | MODULE_VERSION(DRV_VERSION); | |
140 | MODULE_AUTHOR("Ben Nizette <bn@niasdigital.com>"); |