1 /*
2 * platform_msic.c: MSIC platform data initilization file
3 *
4 * (C) Copyright 2013 Intel Corporation
5 * Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; version 2
10 * of the License.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/interrupt.h>
15 #include <linux/scatterlist.h>
16 #include <linux/init.h>
17 #include <linux/sfi.h>
18 #include <linux/mfd/intel_msic.h>
19 #include <asm/intel_scu_ipc.h>
20 #include <asm/intel-mid.h>
21 #include "platform_msic.h"
22
23 struct intel_msic_platform_data msic_pdata;
24
25 static struct resource msic_resources[] = {
26 {
27 .start = INTEL_MSIC_IRQ_PHYS_BASE,
28 .end = INTEL_MSIC_IRQ_PHYS_BASE + 64 - 1,
29 .flags = IORESOURCE_MEM,
30 },
31 };
32
33 static struct platform_device msic_device = {
34 .name = "intel_msic",
35 .id = -1,
36 .dev = {
37 .platform_data = &msic_pdata,
38 },
39 .num_resources = ARRAY_SIZE(msic_resources),
40 .resource = msic_resources,
41 };
42
msic_scu_status_change(struct notifier_block * nb,unsigned long code,void * data)43 static int msic_scu_status_change(struct notifier_block *nb,
44 unsigned long code, void *data)
45 {
46 if (code == SCU_DOWN) {
47 platform_device_unregister(&msic_device);
48 return 0;
49 }
50
51 return platform_device_register(&msic_device);
52 }
53
msic_init(void)54 static int __init msic_init(void)
55 {
56 static struct notifier_block msic_scu_notifier = {
57 .notifier_call = msic_scu_status_change,
58 };
59
60 /*
61 * We need to be sure that the SCU IPC is ready before MSIC device
62 * can be registered.
63 */
64 if (intel_mid_has_msic())
65 intel_scu_notifier_add(&msic_scu_notifier);
66
67 return 0;
68 }
69 arch_initcall(msic_init);
70
71 /*
72 * msic_generic_platform_data - sets generic platform data for the block
73 * @info: pointer to the SFI device table entry for this block
74 * @block: MSIC block
75 *
76 * Function sets IRQ number from the SFI table entry for given device to
77 * the MSIC platform data.
78 */
msic_generic_platform_data(void * info,enum intel_msic_block block)79 void *msic_generic_platform_data(void *info, enum intel_msic_block block)
80 {
81 struct sfi_device_table_entry *entry = info;
82
83 BUG_ON(block < 0 || block >= INTEL_MSIC_BLOCK_LAST);
84 msic_pdata.irq[block] = entry->irq;
85
86 return NULL;
87 }
88