1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | ** hppb.c: |
4 | ** HP-PB bus driver for the NOVA and K-Class systems. |
5 | ** |
6 | ** (c) Copyright 2002 Ryan Bradetich |
7 | ** (c) Copyright 2002 Hewlett-Packard Company |
8 | ** |
9 | ** |
10 | */ |
11 | |
12 | #include <linux/types.h> |
13 | #include <linux/init.h> |
14 | #include <linux/mm.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/dma-mapping.h> |
17 | #include <linux/ioport.h> |
18 | |
19 | #include <asm/io.h> |
20 | #include <asm/hardware.h> |
21 | #include <asm/parisc-device.h> |
22 | |
23 | #include "iommu.h" |
24 | |
25 | struct hppb_card { |
26 | unsigned long hpa; |
27 | struct resource mmio_region; |
28 | struct hppb_card *next; |
29 | }; |
30 | |
31 | static struct hppb_card hppb_card_head = { |
32 | .hpa = 0, |
33 | .next = NULL, |
34 | }; |
35 | |
36 | #define IO_IO_LOW offsetof(struct bc_module, io_io_low) |
37 | #define IO_IO_HIGH offsetof(struct bc_module, io_io_high) |
38 | |
39 | /** |
40 | * hppb_probe - Determine if the hppb driver should claim this device. |
41 | * @dev: The device which has been found |
42 | * |
43 | * Determine if hppb driver should claim this chip (return 0) or not |
44 | * (return 1). If so, initialize the chip and tell other partners in crime |
45 | * they have work to do. |
46 | */ |
47 | static int __init hppb_probe(struct parisc_device *dev) |
48 | { |
49 | int status; |
50 | struct hppb_card *card = &hppb_card_head; |
51 | |
52 | while(card->next) { |
53 | card = card->next; |
54 | } |
55 | |
56 | if(card->hpa) { |
57 | card->next = kzalloc(size: sizeof(struct hppb_card), GFP_KERNEL); |
58 | if(!card->next) { |
59 | printk(KERN_ERR "HP-PB: Unable to allocate memory.\n" ); |
60 | return 1; |
61 | } |
62 | card = card->next; |
63 | } |
64 | |
65 | card->hpa = dev->hpa.start; |
66 | card->mmio_region.name = "HP-PB Bus" ; |
67 | card->mmio_region.flags = IORESOURCE_MEM; |
68 | |
69 | card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW); |
70 | card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1; |
71 | |
72 | status = ccio_request_resource(dev, &card->mmio_region); |
73 | |
74 | pr_info("Found GeckoBoa at %pap, bus space %pR,%s claimed.\n" , |
75 | &dev->hpa.start, |
76 | &card->mmio_region, |
77 | (status < 0) ? " not" :"" ); |
78 | |
79 | return 0; |
80 | } |
81 | |
82 | static const struct parisc_device_id hppb_tbl[] __initconst = { |
83 | { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */ |
84 | { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */ |
85 | { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */ |
86 | { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */ |
87 | { 0, } |
88 | }; |
89 | |
90 | static struct parisc_driver hppb_driver __refdata = { |
91 | .name = "gecko_boa" , |
92 | .id_table = hppb_tbl, |
93 | .probe = hppb_probe, |
94 | }; |
95 | |
96 | /** |
97 | * hppb_init - HP-PB bus initialization procedure. |
98 | * |
99 | * Register this driver. |
100 | */ |
101 | static int __init hppb_init(void) |
102 | { |
103 | return register_parisc_driver(&hppb_driver); |
104 | } |
105 | arch_initcall(hppb_init); |
106 | |