1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun ** hppb.c:
4*4882a593Smuzhiyun ** HP-PB bus driver for the NOVA and K-Class systems.
5*4882a593Smuzhiyun **
6*4882a593Smuzhiyun ** (c) Copyright 2002 Ryan Bradetich
7*4882a593Smuzhiyun ** (c) Copyright 2002 Hewlett-Packard Company
8*4882a593Smuzhiyun **
9*4882a593Smuzhiyun **
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/types.h>
13*4882a593Smuzhiyun #include <linux/init.h>
14*4882a593Smuzhiyun #include <linux/mm.h>
15*4882a593Smuzhiyun #include <linux/slab.h>
16*4882a593Smuzhiyun #include <linux/dma-mapping.h>
17*4882a593Smuzhiyun #include <linux/ioport.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include <asm/io.h>
20*4882a593Smuzhiyun #include <asm/hardware.h>
21*4882a593Smuzhiyun #include <asm/parisc-device.h>
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun #include "iommu.h"
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun struct hppb_card {
26*4882a593Smuzhiyun unsigned long hpa;
27*4882a593Smuzhiyun struct resource mmio_region;
28*4882a593Smuzhiyun struct hppb_card *next;
29*4882a593Smuzhiyun };
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun static struct hppb_card hppb_card_head = {
32*4882a593Smuzhiyun .hpa = 0,
33*4882a593Smuzhiyun .next = NULL,
34*4882a593Smuzhiyun };
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun #define IO_IO_LOW offsetof(struct bc_module, io_io_low)
37*4882a593Smuzhiyun #define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun /**
40*4882a593Smuzhiyun * hppb_probe - Determine if the hppb driver should claim this device.
41*4882a593Smuzhiyun * @dev: The device which has been found
42*4882a593Smuzhiyun *
43*4882a593Smuzhiyun * Determine if hppb driver should claim this chip (return 0) or not
44*4882a593Smuzhiyun * (return 1). If so, initialize the chip and tell other partners in crime
45*4882a593Smuzhiyun * they have work to do.
46*4882a593Smuzhiyun */
hppb_probe(struct parisc_device * dev)47*4882a593Smuzhiyun static int __init hppb_probe(struct parisc_device *dev)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun int status;
50*4882a593Smuzhiyun struct hppb_card *card = &hppb_card_head;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun while(card->next) {
53*4882a593Smuzhiyun card = card->next;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun if(card->hpa) {
57*4882a593Smuzhiyun card->next = kzalloc(sizeof(struct hppb_card), GFP_KERNEL);
58*4882a593Smuzhiyun if(!card->next) {
59*4882a593Smuzhiyun printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
60*4882a593Smuzhiyun return 1;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun card = card->next;
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun card->hpa = dev->hpa.start;
66*4882a593Smuzhiyun card->mmio_region.name = "HP-PB Bus";
67*4882a593Smuzhiyun card->mmio_region.flags = IORESOURCE_MEM;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);
70*4882a593Smuzhiyun card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun status = ccio_request_resource(dev, &card->mmio_region);
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun pr_info("Found GeckoBoa at %pap, bus space %pR,%s claimed.\n",
75*4882a593Smuzhiyun &dev->hpa.start,
76*4882a593Smuzhiyun &card->mmio_region,
77*4882a593Smuzhiyun (status < 0) ? " not":"" );
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun return 0;
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun static const struct parisc_device_id hppb_tbl[] __initconst = {
83*4882a593Smuzhiyun { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */
84*4882a593Smuzhiyun { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */
85*4882a593Smuzhiyun { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */
86*4882a593Smuzhiyun { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */
87*4882a593Smuzhiyun { 0, }
88*4882a593Smuzhiyun };
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun static struct parisc_driver hppb_driver __refdata = {
91*4882a593Smuzhiyun .name = "gecko_boa",
92*4882a593Smuzhiyun .id_table = hppb_tbl,
93*4882a593Smuzhiyun .probe = hppb_probe,
94*4882a593Smuzhiyun };
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun /**
97*4882a593Smuzhiyun * hppb_init - HP-PB bus initialization procedure.
98*4882a593Smuzhiyun *
99*4882a593Smuzhiyun * Register this driver.
100*4882a593Smuzhiyun */
hppb_init(void)101*4882a593Smuzhiyun void __init hppb_init(void)
102*4882a593Smuzhiyun {
103*4882a593Smuzhiyun register_parisc_driver(&hppb_driver);
104*4882a593Smuzhiyun }
105