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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Numascale NumaConnect-specific PCI code
4 *
5 * Copyright (C) 2012 Numascale AS. All rights reserved.
6 *
7 * Send feedback to <support@numascale.com>
8 *
9 * PCI accessor functions derived from mmconfig_64.c
10 *
11 */
12
13#include <linux/pci.h>
14#include <asm/pci_x86.h>
15#include <asm/numachip/numachip.h>
16
17static u8 limit __read_mostly;
18
19static inline char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn)
20{
21 struct pci_mmcfg_region *cfg = pci_mmconfig_lookup(seg, bus);
22
23 if (cfg && cfg->virt)
24 return cfg->virt + (PCI_MMCFG_BUS_OFFSET(bus) | (devfn << 12));
25 return NULL;
26}
27
28static int pci_mmcfg_read_numachip(unsigned int seg, unsigned int bus,
29 unsigned int devfn, int reg, int len, u32 *value)
30{
31 char __iomem *addr;
32
33 /* Why do we have this when nobody checks it. How about a BUG()!? -AK */
34 if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) {
35err: *value = -1;
36 return -EINVAL;
37 }
38
39 /* Ensure AMD Northbridges don't decode reads to other devices */
40 if (unlikely(bus == 0 && devfn >= limit)) {
41 *value = -1;
42 return 0;
43 }
44
45 rcu_read_lock();
46 addr = pci_dev_base(seg, bus, devfn);
47 if (!addr) {
48 rcu_read_unlock();
49 goto err;
50 }
51
52 switch (len) {
53 case 1:
54 *value = mmio_config_readb(addr + reg);
55 break;
56 case 2:
57 *value = mmio_config_readw(addr + reg);
58 break;
59 case 4:
60 *value = mmio_config_readl(addr + reg);
61 break;
62 }
63 rcu_read_unlock();
64
65 return 0;
66}
67
68static int pci_mmcfg_write_numachip(unsigned int seg, unsigned int bus,
69 unsigned int devfn, int reg, int len, u32 value)
70{
71 char __iomem *addr;
72
73 /* Why do we have this when nobody checks it. How about a BUG()!? -AK */
74 if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095)))
75 return -EINVAL;
76
77 /* Ensure AMD Northbridges don't decode writes to other devices */
78 if (unlikely(bus == 0 && devfn >= limit))
79 return 0;
80
81 rcu_read_lock();
82 addr = pci_dev_base(seg, bus, devfn);
83 if (!addr) {
84 rcu_read_unlock();
85 return -EINVAL;
86 }
87
88 switch (len) {
89 case 1:
90 mmio_config_writeb(addr + reg, value);
91 break;
92 case 2:
93 mmio_config_writew(addr + reg, value);
94 break;
95 case 4:
96 mmio_config_writel(addr + reg, value);
97 break;
98 }
99 rcu_read_unlock();
100
101 return 0;
102}
103
104static const struct pci_raw_ops pci_mmcfg_numachip = {
105 .read = pci_mmcfg_read_numachip,
106 .write = pci_mmcfg_write_numachip,
107};
108
109int __init pci_numachip_init(void)
110{
111 int ret = 0;
112 u32 val;
113
114 /* For remote I/O, restrict bus 0 access to the actual number of AMD
115 Northbridges, which starts at device number 0x18 */
116 ret = raw_pci_read(0, 0, PCI_DEVFN(0x18, 0), 0x60, sizeof(val), &val);
117 if (ret)
118 goto out;
119
120 /* HyperTransport fabric size in bits 6:4 */
121 limit = PCI_DEVFN(0x18 + ((val >> 4) & 7) + 1, 0);
122
123 /* Use NumaChip PCI accessors for non-extended and extended access */
124 raw_pci_ops = raw_pci_ext_ops = &pci_mmcfg_numachip;
125out:
126 return ret;
127}
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Numascale NumaConnect-specific PCI code
7 *
8 * Copyright (C) 2012 Numascale AS. All rights reserved.
9 *
10 * Send feedback to <support@numascale.com>
11 *
12 * PCI accessor functions derived from mmconfig_64.c
13 *
14 */
15
16#include <linux/pci.h>
17#include <asm/pci_x86.h>
18
19static u8 limit __read_mostly;
20
21static inline char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn)
22{
23 struct pci_mmcfg_region *cfg = pci_mmconfig_lookup(seg, bus);
24
25 if (cfg && cfg->virt)
26 return cfg->virt + (PCI_MMCFG_BUS_OFFSET(bus) | (devfn << 12));
27 return NULL;
28}
29
30static int pci_mmcfg_read_numachip(unsigned int seg, unsigned int bus,
31 unsigned int devfn, int reg, int len, u32 *value)
32{
33 char __iomem *addr;
34
35 /* Why do we have this when nobody checks it. How about a BUG()!? -AK */
36 if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) {
37err: *value = -1;
38 return -EINVAL;
39 }
40
41 /* Ensure AMD Northbridges don't decode reads to other devices */
42 if (unlikely(bus == 0 && devfn >= limit)) {
43 *value = -1;
44 return 0;
45 }
46
47 rcu_read_lock();
48 addr = pci_dev_base(seg, bus, devfn);
49 if (!addr) {
50 rcu_read_unlock();
51 goto err;
52 }
53
54 switch (len) {
55 case 1:
56 *value = mmio_config_readb(addr + reg);
57 break;
58 case 2:
59 *value = mmio_config_readw(addr + reg);
60 break;
61 case 4:
62 *value = mmio_config_readl(addr + reg);
63 break;
64 }
65 rcu_read_unlock();
66
67 return 0;
68}
69
70static int pci_mmcfg_write_numachip(unsigned int seg, unsigned int bus,
71 unsigned int devfn, int reg, int len, u32 value)
72{
73 char __iomem *addr;
74
75 /* Why do we have this when nobody checks it. How about a BUG()!? -AK */
76 if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095)))
77 return -EINVAL;
78
79 /* Ensure AMD Northbridges don't decode writes to other devices */
80 if (unlikely(bus == 0 && devfn >= limit))
81 return 0;
82
83 rcu_read_lock();
84 addr = pci_dev_base(seg, bus, devfn);
85 if (!addr) {
86 rcu_read_unlock();
87 return -EINVAL;
88 }
89
90 switch (len) {
91 case 1:
92 mmio_config_writeb(addr + reg, value);
93 break;
94 case 2:
95 mmio_config_writew(addr + reg, value);
96 break;
97 case 4:
98 mmio_config_writel(addr + reg, value);
99 break;
100 }
101 rcu_read_unlock();
102
103 return 0;
104}
105
106static const struct pci_raw_ops pci_mmcfg_numachip = {
107 .read = pci_mmcfg_read_numachip,
108 .write = pci_mmcfg_write_numachip,
109};
110
111int __init pci_numachip_init(void)
112{
113 int ret = 0;
114 u32 val;
115
116 /* For remote I/O, restrict bus 0 access to the actual number of AMD
117 Northbridges, which starts at device number 0x18 */
118 ret = raw_pci_read(0, 0, PCI_DEVFN(0x18, 0), 0x60, sizeof(val), &val);
119 if (ret)
120 goto out;
121
122 /* HyperTransport fabric size in bits 6:4 */
123 limit = PCI_DEVFN(0x18 + ((val >> 4) & 7) + 1, 0);
124
125 /* Use NumaChip PCI accessors for non-extended and extended access */
126 raw_pci_ops = raw_pci_ext_ops = &pci_mmcfg_numachip;
127out:
128 return ret;
129}