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  */
hppb_probe(struct parisc_device * dev)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(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  */
hppb_init(void)101 void __init hppb_init(void)
102 {
103         register_parisc_driver(&hppb_driver);
104 }
105