pmc.c (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2) pmc.c (f1b6aa87b7eb8573d04f8cb21574fe565e86a380)
1/* pmc - Driver implementation for power management functions
2 * of Power Management Controller (PMC) on SPARCstation-Voyager.
3 *
4 * Copyright (c) 2002 Eric Brower (ebrower@usa.net)
5 */
6
7#include <linux/kernel.h>
8#include <linux/fs.h>
9#include <linux/errno.h>
10#include <linux/init.h>
11#include <linux/miscdevice.h>
12#include <linux/pm.h>
1/* pmc - Driver implementation for power management functions
2 * of Power Management Controller (PMC) on SPARCstation-Voyager.
3 *
4 * Copyright (c) 2002 Eric Brower (ebrower@usa.net)
5 */
6
7#include <linux/kernel.h>
8#include <linux/fs.h>
9#include <linux/errno.h>
10#include <linux/init.h>
11#include <linux/miscdevice.h>
12#include <linux/pm.h>
13#include <linux/of.h>
14#include <linux/of_device.h>
13
14#include <asm/io.h>
15
16#include <asm/io.h>
15#include <asm/sbus.h>
16#include <asm/oplib.h>
17#include <asm/uaccess.h>
18#include <asm/auxio.h>
19
20/* Debug
21 *
22 * #define PMC_DEBUG_LED
23 * #define PMC_NO_IDLE
24 */
25
26#define PMC_MINOR MISC_DYNAMIC_MINOR
27#define PMC_OBPNAME "SUNW,pmc"
28#define PMC_DEVNAME "pmc"
29
30#define PMC_IDLE_REG 0x00
31#define PMC_IDLE_ON 0x01
32
17#include <asm/oplib.h>
18#include <asm/uaccess.h>
19#include <asm/auxio.h>
20
21/* Debug
22 *
23 * #define PMC_DEBUG_LED
24 * #define PMC_NO_IDLE
25 */
26
27#define PMC_MINOR MISC_DYNAMIC_MINOR
28#define PMC_OBPNAME "SUNW,pmc"
29#define PMC_DEVNAME "pmc"
30
31#define PMC_IDLE_REG 0x00
32#define PMC_IDLE_ON 0x01
33
33volatile static u8 __iomem *regs;
34static int pmc_regsize;
34static u8 __iomem *regs;
35
35
36#define pmc_readb(offs) (sbus_readb(regs+offs))
36#define pmc_readb(offs) (sbus_readb(regs+offs))
37#define pmc_writeb(val, offs) (sbus_writeb(val, regs+offs))
38
39/*
40 * CPU idle callback function
41 * See .../arch/sparc/kernel/process.c
42 */
43void pmc_swift_idle(void)
44{
45#ifdef PMC_DEBUG_LED
46 set_auxio(0x00, AUXIO_LED);
47#endif
48
49 pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG);
50
51#ifdef PMC_DEBUG_LED
52 set_auxio(AUXIO_LED, 0x00);
53#endif
54}
55
37#define pmc_writeb(val, offs) (sbus_writeb(val, regs+offs))
38
39/*
40 * CPU idle callback function
41 * See .../arch/sparc/kernel/process.c
42 */
43void pmc_swift_idle(void)
44{
45#ifdef PMC_DEBUG_LED
46 set_auxio(0x00, AUXIO_LED);
47#endif
48
49 pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG);
50
51#ifdef PMC_DEBUG_LED
52 set_auxio(AUXIO_LED, 0x00);
53#endif
54}
55
56static inline void pmc_free(void)
56static int __devinit pmc_probe(struct of_device *op,
57 const struct of_device_id *match)
57{
58{
58 sbus_iounmap(regs, pmc_regsize);
59}
60
61static int __init pmc_probe(void)
62{
63 struct sbus_bus *sbus = NULL;
64 struct sbus_dev *sdev = NULL;
65 for_each_sbus(sbus) {
66 for_each_sbusdev(sdev, sbus) {
67 if (!strcmp(sdev->prom_name, PMC_OBPNAME)) {
68 goto sbus_done;
69 }
70 }
71 }
72
73sbus_done:
74 if (!sdev) {
75 return -ENODEV;
76 }
77
78 pmc_regsize = sdev->reg_addrs[0].reg_size;
79 regs = sbus_ioremap(&sdev->resource[0], 0,
80 pmc_regsize, PMC_OBPNAME);
59 regs = of_ioremap(&op->resource[0], 0,
60 resource_size(&op->resource[0]), PMC_OBPNAME);
81 if (!regs) {
82 printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME);
83 return -ENODEV;
84 }
85
86#ifndef PMC_NO_IDLE
87 /* Assign power management IDLE handler */
88 pm_idle = pmc_swift_idle;
89#endif
90
91 printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME);
92 return 0;
93}
94
61 if (!regs) {
62 printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME);
63 return -ENODEV;
64 }
65
66#ifndef PMC_NO_IDLE
67 /* Assign power management IDLE handler */
68 pm_idle = pmc_swift_idle;
69#endif
70
71 printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME);
72 return 0;
73}
74
75static struct of_device_id pmc_match[] = {
76 {
77 .name = PMC_OBPNAME,
78 },
79 {},
80};
81MODULE_DEVICE_TABLE(of, pmc_match);
82
83static struct of_platform_driver pmc_driver = {
84 .name = "pmc",
85 .match_table = pmc_match,
86 .probe = pmc_probe,
87};
88
89static int __init pmc_init(void)
90{
91 return of_register_driver(&pmc_driver, &of_bus_type);
92}
93
95/* This driver is not critical to the boot process
96 * and is easiest to ioremap when SBus is already
97 * initialized, so we install ourselves thusly:
98 */
94/* This driver is not critical to the boot process
95 * and is easiest to ioremap when SBus is already
96 * initialized, so we install ourselves thusly:
97 */
99__initcall(pmc_probe);
98__initcall(pmc_init);