hugetlb: introduce generic version of hugetlb_free_pgd_range
[linux/fpc-iii.git] / arch / x86 / pci / numachip.c
blob2e565e65c893e777a828aa198e1e7a5b02f6dcbd
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.
6 * Numascale NumaConnect-specific PCI code
8 * Copyright (C) 2012 Numascale AS. All rights reserved.
10 * Send feedback to <support@numascale.com>
12 * PCI accessor functions derived from mmconfig_64.c
16 #include <linux/pci.h>
17 #include <asm/pci_x86.h>
19 static u8 limit __read_mostly;
21 static inline char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn)
23 struct pci_mmcfg_region *cfg = pci_mmconfig_lookup(seg, bus);
25 if (cfg && cfg->virt)
26 return cfg->virt + (PCI_MMCFG_BUS_OFFSET(bus) | (devfn << 12));
27 return NULL;
30 static int pci_mmcfg_read_numachip(unsigned int seg, unsigned int bus,
31 unsigned int devfn, int reg, int len, u32 *value)
33 char __iomem *addr;
35 /* Why do we have this when nobody checks it. How about a BUG()!? -AK */
36 if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) {
37 err: *value = -1;
38 return -EINVAL;
41 /* Ensure AMD Northbridges don't decode reads to other devices */
42 if (unlikely(bus == 0 && devfn >= limit)) {
43 *value = -1;
44 return 0;
47 rcu_read_lock();
48 addr = pci_dev_base(seg, bus, devfn);
49 if (!addr) {
50 rcu_read_unlock();
51 goto err;
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;
65 rcu_read_unlock();
67 return 0;
70 static int pci_mmcfg_write_numachip(unsigned int seg, unsigned int bus,
71 unsigned int devfn, int reg, int len, u32 value)
73 char __iomem *addr;
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;
79 /* Ensure AMD Northbridges don't decode writes to other devices */
80 if (unlikely(bus == 0 && devfn >= limit))
81 return 0;
83 rcu_read_lock();
84 addr = pci_dev_base(seg, bus, devfn);
85 if (!addr) {
86 rcu_read_unlock();
87 return -EINVAL;
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;
101 rcu_read_unlock();
103 return 0;
106 static const struct pci_raw_ops pci_mmcfg_numachip = {
107 .read = pci_mmcfg_read_numachip,
108 .write = pci_mmcfg_write_numachip,
111 int __init pci_numachip_init(void)
113 int ret = 0;
114 u32 val;
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;
122 /* HyperTransport fabric size in bits 6:4 */
123 limit = PCI_DEVFN(0x18 + ((val >> 4) & 7) + 1, 0);
125 /* Use NumaChip PCI accessors for non-extended and extended access */
126 raw_pci_ops = raw_pci_ext_ops = &pci_mmcfg_numachip;
127 out:
128 return ret;