1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * platform_msic.c: MSIC platform data initialization file
4 *
5 * (C) Copyright 2013 Intel Corporation
6 * Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/interrupt.h>
11 #include <linux/scatterlist.h>
12 #include <linux/init.h>
13 #include <linux/sfi.h>
14 #include <linux/mfd/intel_msic.h>
15 #include <asm/intel_scu_ipc.h>
16 #include <asm/intel-mid.h>
17 #include "platform_msic.h"
18
19 struct intel_msic_platform_data msic_pdata;
20
21 static struct resource msic_resources[] = {
22 {
23 .start = INTEL_MSIC_IRQ_PHYS_BASE,
24 .end = INTEL_MSIC_IRQ_PHYS_BASE + 64 - 1,
25 .flags = IORESOURCE_MEM,
26 },
27 };
28
29 static struct platform_device msic_device = {
30 .name = "intel_msic",
31 .id = -1,
32 .dev = {
33 .platform_data = &msic_pdata,
34 },
35 .num_resources = ARRAY_SIZE(msic_resources),
36 .resource = msic_resources,
37 };
38
msic_scu_status_change(struct notifier_block * nb,unsigned long code,void * data)39 static int msic_scu_status_change(struct notifier_block *nb,
40 unsigned long code, void *data)
41 {
42 if (code == SCU_DOWN) {
43 platform_device_unregister(&msic_device);
44 return 0;
45 }
46
47 return platform_device_register(&msic_device);
48 }
49
msic_init(void)50 static int __init msic_init(void)
51 {
52 static struct notifier_block msic_scu_notifier = {
53 .notifier_call = msic_scu_status_change,
54 };
55
56 /*
57 * We need to be sure that the SCU IPC is ready before MSIC device
58 * can be registered.
59 */
60 if (intel_mid_has_msic())
61 intel_scu_notifier_add(&msic_scu_notifier);
62
63 return 0;
64 }
65 arch_initcall(msic_init);
66
67 /*
68 * msic_generic_platform_data - sets generic platform data for the block
69 * @info: pointer to the SFI device table entry for this block
70 * @block: MSIC block
71 *
72 * Function sets IRQ number from the SFI table entry for given device to
73 * the MSIC platform data.
74 */
msic_generic_platform_data(void * info,enum intel_msic_block block)75 void *msic_generic_platform_data(void *info, enum intel_msic_block block)
76 {
77 struct sfi_device_table_entry *entry = info;
78
79 BUG_ON(block < 0 || block >= INTEL_MSIC_BLOCK_LAST);
80 msic_pdata.irq[block] = entry->irq;
81
82 return NULL;
83 }
84
