[ARM] Remove clk_use()/clk_unuse()
[linux-2.6/kvm.git] / drivers / input / serio / ambakmi.c
blobd847ed51cfb19fe9950220626aedeec45e210088
1 /*
2 * linux/drivers/input/serio/ambakmi.c
4 * Copyright (C) 2000-2003 Deep Blue Solutions Ltd.
5 * Copyright (C) 2002 Russell King.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/serio.h>
15 #include <linux/errno.h>
16 #include <linux/interrupt.h>
17 #include <linux/ioport.h>
18 #include <linux/device.h>
19 #include <linux/delay.h>
20 #include <linux/slab.h>
21 #include <linux/err.h>
23 #include <asm/io.h>
24 #include <asm/irq.h>
25 #include <asm/hardware/amba.h>
26 #include <asm/hardware/amba_kmi.h>
27 #include <asm/hardware/clock.h>
29 #define KMI_BASE (kmi->base)
31 struct amba_kmi_port {
32 struct serio *io;
33 struct clk *clk;
34 void __iomem *base;
35 unsigned int irq;
36 unsigned int divisor;
37 unsigned int open;
40 static irqreturn_t amba_kmi_int(int irq, void *dev_id, struct pt_regs *regs)
42 struct amba_kmi_port *kmi = dev_id;
43 unsigned int status = readb(KMIIR);
44 int handled = IRQ_NONE;
46 while (status & KMIIR_RXINTR) {
47 serio_interrupt(kmi->io, readb(KMIDATA), 0, regs);
48 status = readb(KMIIR);
49 handled = IRQ_HANDLED;
52 return handled;
55 static int amba_kmi_write(struct serio *io, unsigned char val)
57 struct amba_kmi_port *kmi = io->port_data;
58 unsigned int timeleft = 10000; /* timeout in 100ms */
60 while ((readb(KMISTAT) & KMISTAT_TXEMPTY) == 0 && timeleft--)
61 udelay(10);
63 if (timeleft)
64 writeb(val, KMIDATA);
66 return timeleft ? 0 : SERIO_TIMEOUT;
69 static int amba_kmi_open(struct serio *io)
71 struct amba_kmi_port *kmi = io->port_data;
72 unsigned int divisor;
73 int ret;
75 ret = clk_enable(kmi->clk);
76 if (ret)
77 goto out;
79 divisor = clk_get_rate(kmi->clk) / 8000000 - 1;
80 writeb(divisor, KMICLKDIV);
81 writeb(KMICR_EN, KMICR);
83 ret = request_irq(kmi->irq, amba_kmi_int, 0, "kmi-pl050", kmi);
84 if (ret) {
85 printk(KERN_ERR "kmi: failed to claim IRQ%d\n", kmi->irq);
86 writeb(0, KMICR);
87 goto clk_disable;
90 writeb(KMICR_EN | KMICR_RXINTREN, KMICR);
92 return 0;
94 clk_disable:
95 clk_disable(kmi->clk);
96 out:
97 return ret;
100 static void amba_kmi_close(struct serio *io)
102 struct amba_kmi_port *kmi = io->port_data;
104 writeb(0, KMICR);
106 free_irq(kmi->irq, kmi);
107 clk_disable(kmi->clk);
110 static int amba_kmi_probe(struct amba_device *dev, void *id)
112 struct amba_kmi_port *kmi;
113 struct serio *io;
114 int ret;
116 ret = amba_request_regions(dev, NULL);
117 if (ret)
118 return ret;
120 kmi = kmalloc(sizeof(struct amba_kmi_port), GFP_KERNEL);
121 io = kmalloc(sizeof(struct serio), GFP_KERNEL);
122 if (!kmi || !io) {
123 ret = -ENOMEM;
124 goto out;
127 memset(kmi, 0, sizeof(struct amba_kmi_port));
128 memset(io, 0, sizeof(struct serio));
130 io->id.type = SERIO_8042;
131 io->write = amba_kmi_write;
132 io->open = amba_kmi_open;
133 io->close = amba_kmi_close;
134 strlcpy(io->name, dev->dev.bus_id, sizeof(io->name));
135 strlcpy(io->phys, dev->dev.bus_id, sizeof(io->phys));
136 io->port_data = kmi;
137 io->dev.parent = &dev->dev;
139 kmi->io = io;
140 kmi->base = ioremap(dev->res.start, KMI_SIZE);
141 if (!kmi->base) {
142 ret = -ENOMEM;
143 goto out;
146 kmi->clk = clk_get(&dev->dev, "KMIREFCLK");
147 if (IS_ERR(kmi->clk)) {
148 ret = PTR_ERR(kmi->clk);
149 goto unmap;
152 kmi->irq = dev->irq[0];
153 amba_set_drvdata(dev, kmi);
155 serio_register_port(kmi->io);
156 return 0;
158 unmap:
159 iounmap(kmi->base);
160 out:
161 kfree(kmi);
162 kfree(io);
163 amba_release_regions(dev);
164 return ret;
167 static int amba_kmi_remove(struct amba_device *dev)
169 struct amba_kmi_port *kmi = amba_get_drvdata(dev);
171 amba_set_drvdata(dev, NULL);
173 serio_unregister_port(kmi->io);
174 clk_put(kmi->clk);
175 iounmap(kmi->base);
176 kfree(kmi);
177 amba_release_regions(dev);
178 return 0;
181 static int amba_kmi_resume(struct amba_device *dev)
183 struct amba_kmi_port *kmi = amba_get_drvdata(dev);
185 /* kick the serio layer to rescan this port */
186 serio_reconnect(kmi->io);
188 return 0;
191 static struct amba_id amba_kmi_idtable[] = {
193 .id = 0x00041050,
194 .mask = 0x000fffff,
196 { 0, 0 }
199 static struct amba_driver ambakmi_driver = {
200 .drv = {
201 .name = "kmi-pl050",
203 .id_table = amba_kmi_idtable,
204 .probe = amba_kmi_probe,
205 .remove = amba_kmi_remove,
206 .resume = amba_kmi_resume,
209 static int __init amba_kmi_init(void)
211 return amba_driver_register(&ambakmi_driver);
214 static void __exit amba_kmi_exit(void)
216 amba_driver_unregister(&ambakmi_driver);
219 module_init(amba_kmi_init);
220 module_exit(amba_kmi_exit);
222 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
223 MODULE_DESCRIPTION("AMBA KMI controller driver");
224 MODULE_LICENSE("GPL");