forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
127 lines
2.8 KiB
127 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Numascale NumaConnect-specific PCI code |
|
* |
|
* Copyright (C) 2012 Numascale AS. All rights reserved. |
|
* |
|
* Send feedback to <[email protected]> |
|
* |
|
* PCI accessor functions derived from mmconfig_64.c |
|
* |
|
*/ |
|
|
|
#include <linux/pci.h> |
|
#include <asm/pci_x86.h> |
|
#include <asm/numachip/numachip.h> |
|
|
|
static u8 limit __read_mostly; |
|
|
|
static inline char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn) |
|
{ |
|
struct pci_mmcfg_region *cfg = pci_mmconfig_lookup(seg, bus); |
|
|
|
if (cfg && cfg->virt) |
|
return cfg->virt + (PCI_MMCFG_BUS_OFFSET(bus) | (devfn << 12)); |
|
return NULL; |
|
} |
|
|
|
static int pci_mmcfg_read_numachip(unsigned int seg, unsigned int bus, |
|
unsigned int devfn, int reg, int len, u32 *value) |
|
{ |
|
char __iomem *addr; |
|
|
|
/* Why do we have this when nobody checks it. How about a BUG()!? -AK */ |
|
if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) { |
|
err: *value = -1; |
|
return -EINVAL; |
|
} |
|
|
|
/* Ensure AMD Northbridges don't decode reads to other devices */ |
|
if (unlikely(bus == 0 && devfn >= limit)) { |
|
*value = -1; |
|
return 0; |
|
} |
|
|
|
rcu_read_lock(); |
|
addr = pci_dev_base(seg, bus, devfn); |
|
if (!addr) { |
|
rcu_read_unlock(); |
|
goto err; |
|
} |
|
|
|
switch (len) { |
|
case 1: |
|
*value = mmio_config_readb(addr + reg); |
|
break; |
|
case 2: |
|
*value = mmio_config_readw(addr + reg); |
|
break; |
|
case 4: |
|
*value = mmio_config_readl(addr + reg); |
|
break; |
|
} |
|
rcu_read_unlock(); |
|
|
|
return 0; |
|
} |
|
|
|
static int pci_mmcfg_write_numachip(unsigned int seg, unsigned int bus, |
|
unsigned int devfn, int reg, int len, u32 value) |
|
{ |
|
char __iomem *addr; |
|
|
|
/* Why do we have this when nobody checks it. How about a BUG()!? -AK */ |
|
if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) |
|
return -EINVAL; |
|
|
|
/* Ensure AMD Northbridges don't decode writes to other devices */ |
|
if (unlikely(bus == 0 && devfn >= limit)) |
|
return 0; |
|
|
|
rcu_read_lock(); |
|
addr = pci_dev_base(seg, bus, devfn); |
|
if (!addr) { |
|
rcu_read_unlock(); |
|
return -EINVAL; |
|
} |
|
|
|
switch (len) { |
|
case 1: |
|
mmio_config_writeb(addr + reg, value); |
|
break; |
|
case 2: |
|
mmio_config_writew(addr + reg, value); |
|
break; |
|
case 4: |
|
mmio_config_writel(addr + reg, value); |
|
break; |
|
} |
|
rcu_read_unlock(); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct pci_raw_ops pci_mmcfg_numachip = { |
|
.read = pci_mmcfg_read_numachip, |
|
.write = pci_mmcfg_write_numachip, |
|
}; |
|
|
|
int __init pci_numachip_init(void) |
|
{ |
|
int ret = 0; |
|
u32 val; |
|
|
|
/* For remote I/O, restrict bus 0 access to the actual number of AMD |
|
Northbridges, which starts at device number 0x18 */ |
|
ret = raw_pci_read(0, 0, PCI_DEVFN(0x18, 0), 0x60, sizeof(val), &val); |
|
if (ret) |
|
goto out; |
|
|
|
/* HyperTransport fabric size in bits 6:4 */ |
|
limit = PCI_DEVFN(0x18 + ((val >> 4) & 7) + 1, 0); |
|
|
|
/* Use NumaChip PCI accessors for non-extended and extended access */ |
|
raw_pci_ops = raw_pci_ext_ops = &pci_mmcfg_numachip; |
|
out: |
|
return ret; |
|
}
|
|
|