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2c973ef0 DCZ |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved. | |
7 | * Copyright (C) 2013 Imagination Technologies Ltd. | |
8 | */ | |
9 | #include <linux/device.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/err.h> | |
12 | #include <linux/wait.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/irq.h> | |
16 | ||
17 | #include <asm/mips_mt.h> | |
18 | #include <asm/vpe.h> | |
19 | #include <asm/rtlx.h> | |
20 | ||
21 | static int major; | |
22 | ||
23 | static void rtlx_dispatch(void) | |
24 | { | |
25 | if (read_c0_cause() & read_c0_status() & C_SW0) | |
26 | do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ); | |
27 | } | |
28 | ||
29 | /* | |
30 | * Interrupt handler may be called before rtlx_init has otherwise had | |
31 | * a chance to run. | |
32 | */ | |
33 | static irqreturn_t rtlx_interrupt(int irq, void *dev_id) | |
34 | { | |
35 | unsigned int vpeflags; | |
36 | unsigned long flags; | |
37 | int i; | |
38 | ||
2c973ef0 DCZ |
39 | local_irq_save(flags); |
40 | vpeflags = dvpe(); | |
41 | set_c0_status(0x100 << MIPS_CPU_RTLX_IRQ); | |
42 | irq_enable_hazard(); | |
43 | evpe(vpeflags); | |
44 | local_irq_restore(flags); | |
45 | ||
46 | for (i = 0; i < RTLX_CHANNELS; i++) { | |
47 | wake_up(&channel_wqs[i].lx_queue); | |
48 | wake_up(&channel_wqs[i].rt_queue); | |
49 | } | |
50 | ||
51 | return IRQ_HANDLED; | |
52 | } | |
53 | ||
54 | static struct irqaction rtlx_irq = { | |
55 | .handler = rtlx_interrupt, | |
56 | .name = "RTLX", | |
57 | }; | |
58 | ||
59 | static int rtlx_irq_num = MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ; | |
60 | ||
61 | void _interrupt_sp(void) | |
62 | { | |
63 | unsigned long flags; | |
64 | ||
65 | local_irq_save(flags); | |
66 | dvpe(); | |
67 | settc(1); | |
68 | write_vpe_c0_cause(read_vpe_c0_cause() | C_SW0); | |
69 | evpe(EVPE_ENABLE); | |
70 | local_irq_restore(flags); | |
71 | } | |
72 | ||
73 | int __init rtlx_module_init(void) | |
74 | { | |
75 | struct device *dev; | |
76 | int i, err; | |
77 | ||
78 | if (!cpu_has_mipsmt) { | |
79 | pr_warn("VPE loader: not a MIPS MT capable processor\n"); | |
80 | return -ENODEV; | |
81 | } | |
82 | ||
83 | if (aprp_cpu_index() == 0) { | |
84 | pr_warn("No TCs reserved for AP/SP, not initializing RTLX.\n" | |
85 | "Pass maxtcs=<n> argument as kernel argument\n"); | |
86 | ||
87 | return -ENODEV; | |
88 | } | |
89 | ||
90 | major = register_chrdev(0, RTLX_MODULE_NAME, &rtlx_fops); | |
91 | if (major < 0) { | |
92 | pr_err("rtlx_module_init: unable to register device\n"); | |
93 | return major; | |
94 | } | |
95 | ||
96 | /* initialise the wait queues */ | |
97 | for (i = 0; i < RTLX_CHANNELS; i++) { | |
98 | init_waitqueue_head(&channel_wqs[i].rt_queue); | |
99 | init_waitqueue_head(&channel_wqs[i].lx_queue); | |
100 | atomic_set(&channel_wqs[i].in_open, 0); | |
101 | mutex_init(&channel_wqs[i].mutex); | |
102 | ||
103 | dev = device_create(mt_class, NULL, MKDEV(major, i), NULL, | |
104 | "%s%d", RTLX_MODULE_NAME, i); | |
105 | if (IS_ERR(dev)) { | |
0435b13e SB |
106 | while (i--) |
107 | device_destroy(mt_class, MKDEV(major, i)); | |
108 | ||
2c973ef0 DCZ |
109 | err = PTR_ERR(dev); |
110 | goto out_chrdev; | |
111 | } | |
112 | } | |
113 | ||
114 | /* set up notifiers */ | |
115 | rtlx_notify.start = rtlx_starting; | |
116 | rtlx_notify.stop = rtlx_stopping; | |
117 | vpe_notify(aprp_cpu_index(), &rtlx_notify); | |
118 | ||
119 | if (cpu_has_vint) { | |
120 | aprp_hook = rtlx_dispatch; | |
121 | } else { | |
122 | pr_err("APRP RTLX init on non-vectored-interrupt processor\n"); | |
123 | err = -ENODEV; | |
124 | goto out_class; | |
125 | } | |
126 | ||
127 | rtlx_irq.dev_id = rtlx; | |
128 | err = setup_irq(rtlx_irq_num, &rtlx_irq); | |
129 | if (err) | |
130 | goto out_class; | |
131 | ||
132 | return 0; | |
133 | ||
134 | out_class: | |
135 | for (i = 0; i < RTLX_CHANNELS; i++) | |
136 | device_destroy(mt_class, MKDEV(major, i)); | |
137 | out_chrdev: | |
138 | unregister_chrdev(major, RTLX_MODULE_NAME); | |
139 | ||
140 | return err; | |
141 | } | |
142 | ||
143 | void __exit rtlx_module_exit(void) | |
144 | { | |
145 | int i; | |
146 | ||
147 | for (i = 0; i < RTLX_CHANNELS; i++) | |
148 | device_destroy(mt_class, MKDEV(major, i)); | |
eee57948 | 149 | |
2c973ef0 | 150 | unregister_chrdev(major, RTLX_MODULE_NAME); |
eee57948 DCZ |
151 | |
152 | aprp_hook = NULL; | |
2c973ef0 | 153 | } |