1// SPDX-License-Identifier: GPL-2.0
  2/* pmc - Driver implementation for power management functions
  3 * of Power Management Controller (PMC) on SPARCstation-Voyager.
  4 *
  5 * Copyright (c) 2002 Eric Brower (ebrower@usa.net)
  6 */
  7
  8#include <linux/kernel.h>
  9#include <linux/fs.h>
 10#include <linux/errno.h>
 11#include <linux/init.h>
 12#include <linux/pm.h>
 13#include <linux/of.h>
 14#include <linux/of_device.h>
 15#include <linux/module.h>
 16
 17#include <asm/io.h>
 18#include <asm/oplib.h>
 19#include <linux/uaccess.h>
 20#include <asm/auxio.h>
 21#include <asm/processor.h>
 22
 23/* Debug
 24 *
 25 * #define PMC_DEBUG_LED
 26 * #define PMC_NO_IDLE
 27 */
 28
 29#define PMC_OBPNAME	"SUNW,pmc"
 30#define PMC_DEVNAME	"pmc"
 31
 32#define PMC_IDLE_REG	0x00
 33#define PMC_IDLE_ON	0x01
 34
 35static u8 __iomem *regs;
 36
 37#define pmc_readb(offs)		(sbus_readb(regs+offs))
 38#define pmc_writeb(val, offs)	(sbus_writeb(val, regs+offs))
 39
 40/*
 41 * CPU idle callback function
 42 * See .../arch/sparc/kernel/process.c
 43 */
 44static void pmc_swift_idle(void)
 45{
 46#ifdef PMC_DEBUG_LED
 47	set_auxio(0x00, AUXIO_LED);
 48#endif
 49
 50	pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG);
 51
 52#ifdef PMC_DEBUG_LED
 53	set_auxio(AUXIO_LED, 0x00);
 54#endif
 55}
 56
 57static int pmc_probe(struct platform_device *op)
 58{
 59	regs = of_ioremap(&op->resource[0], 0,
 60			  resource_size(&op->resource[0]), PMC_OBPNAME);
 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	sparc_idle = pmc_swift_idle;
 69#endif
 70
 71	printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME);
 72	return 0;
 73}
 74
 75static const struct of_device_id pmc_match[] = {
 76	{
 77		.name = PMC_OBPNAME,
 78	},
 79	{},
 80};
 81MODULE_DEVICE_TABLE(of, pmc_match);
 82
 83static struct platform_driver pmc_driver = {
 84	.driver = {
 85		.name = "pmc",
 
 86		.of_match_table = pmc_match,
 87	},
 88	.probe		= pmc_probe,
 89};
 90
 91static int __init pmc_init(void)
 92{
 93	return platform_driver_register(&pmc_driver);
 94}
 95
 96/* This driver is not critical to the boot process
 97 * and is easiest to ioremap when SBus is already
 98 * initialized, so we install ourselves thusly:
 99 */
100__initcall(pmc_init);

 
 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/pm.h>
12#include <linux/of.h>
13#include <linux/of_device.h>
14#include <linux/module.h>
15
16#include <asm/io.h>
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_OBPNAME	"SUNW,pmc"
28#define PMC_DEVNAME	"pmc"
29
30#define PMC_IDLE_REG	0x00
31#define PMC_IDLE_ON	0x01
32
33static u8 __iomem *regs;
34
35#define pmc_readb(offs)		(sbus_readb(regs+offs))
36#define pmc_writeb(val, offs)	(sbus_writeb(val, regs+offs))
37
38/*
39 * CPU idle callback function
40 * See .../arch/sparc/kernel/process.c
41 */
42static void pmc_swift_idle(void)
43{
44#ifdef PMC_DEBUG_LED
45	set_auxio(0x00, AUXIO_LED);
46#endif
47
48	pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG);
49
50#ifdef PMC_DEBUG_LED
51	set_auxio(AUXIO_LED, 0x00);
52#endif
53}
54
55static int __devinit pmc_probe(struct platform_device *op)
56{
57	regs = of_ioremap(&op->resource[0], 0,
58			  resource_size(&op->resource[0]), PMC_OBPNAME);
59	if (!regs) {
60		printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME);
61		return -ENODEV;
62	}
63
64#ifndef PMC_NO_IDLE
65	/* Assign power management IDLE handler */
66	pm_idle = pmc_swift_idle;
67#endif
68
69	printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME);
70	return 0;
71}
72
73static struct of_device_id pmc_match[] = {
74	{
75		.name = PMC_OBPNAME,
76	},
77	{},
78};
79MODULE_DEVICE_TABLE(of, pmc_match);
80
81static struct platform_driver pmc_driver = {
82	.driver = {
83		.name = "pmc",
84		.owner = THIS_MODULE,
85		.of_match_table = pmc_match,
86	},
87	.probe		= pmc_probe,
88};
89
90static int __init pmc_init(void)
91{
92	return platform_driver_register(&pmc_driver);
93}
94
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 */
99__initcall(pmc_init);