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linux/arch/ppc64/kernel/pmac_pci.c

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/*
* Support for PCI bridges found on Power Macintoshes.
* At present the "bandit" and "chaos" bridges are supported.
* Fortunately you access configuration space in the same
* way with either bridge.
*
* Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
* Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/iommu.h>
#include "pci.h"
#include "pmac.h"
#define DEBUG
#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif
/* XXX Could be per-controller, but I don't think we risk anything by
* assuming we won't have both UniNorth and Bandit */
static int has_uninorth;
static struct pci_controller *u3_agp;
struct device_node *k2_skiplist[2];
static int __init fixup_one_level_bus_range(struct device_node *node, int higher)
{
for (; node != 0;node = node->sibling) {
int * bus_range;
unsigned int *class_code;
int len;
/* For PCI<->PCI bridges or CardBus bridges, we go down */
class_code = (unsigned int *) get_property(node, "class-code", NULL);
if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
continue;
bus_range = (int *) get_property(node, "bus-range", &len);
if (bus_range != NULL && len > 2 * sizeof(int)) {
if (bus_range[1] > higher)
higher = bus_range[1];
}
higher = fixup_one_level_bus_range(node->child, higher);
}
return higher;
}
/* This routine fixes the "bus-range" property of all bridges in the
* system since they tend to have their "last" member wrong on macs
*
* Note that the bus numbers manipulated here are OF bus numbers, they
* are not Linux bus numbers.
*/
static void __init fixup_bus_range(struct device_node *bridge)
{
int * bus_range;
int len;
/* Lookup the "bus-range" property for the hose */
bus_range = (int *) get_property(bridge, "bus-range", &len);
if (bus_range == NULL || len < 2 * sizeof(int)) {
printk(KERN_WARNING "Can't get bus-range for %s\n",
bridge->full_name);
return;
}
bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
}
/*
* Apple MacRISC (U3, UniNorth, Bandit, Chaos) PCI controllers.
*
* The "Bandit" version is present in all early PCI PowerMacs,
* and up to the first ones using Grackle. Some machines may
* have 2 bandit controllers (2 PCI busses).
*
* "Chaos" is used in some "Bandit"-type machines as a bridge
* for the separate display bus. It is accessed the same
* way as bandit, but cannot be probed for devices. It therefore
* has its own config access functions.
*
* The "UniNorth" version is present in all Core99 machines
* (iBook, G4, new IMacs, and all the recent Apple machines).
* It contains 3 controllers in one ASIC.
*
* The U3 is the bridge used on G5 machines. It contains on
* AGP bus which is dealt with the old UniNorth access routines
* and an HyperTransport bus which uses its own set of access
* functions.
*/
#define MACRISC_CFA0(devfn, off) \
((1 << (unsigned long)PCI_SLOT(dev_fn)) \
| (((unsigned long)PCI_FUNC(dev_fn)) << 8) \
| (((unsigned long)(off)) & 0xFCUL))
#define MACRISC_CFA1(bus, devfn, off) \
((((unsigned long)(bus)) << 16) \
|(((unsigned long)(devfn)) << 8) \
|(((unsigned long)(off)) & 0xFCUL) \
|1UL)
static unsigned long __pmac macrisc_cfg_access(struct pci_controller* hose,
u8 bus, u8 dev_fn, u8 offset)
{
unsigned int caddr;
if (bus == hose->first_busno) {
if (dev_fn < (11 << 3))
return 0;
caddr = MACRISC_CFA0(dev_fn, offset);
} else
caddr = MACRISC_CFA1(bus, dev_fn, offset);
/* Uninorth will return garbage if we don't read back the value ! */
do {
out_le32(hose->cfg_addr, caddr);
} while (in_le32(hose->cfg_addr) != caddr);
offset &= has_uninorth ? 0x07 : 0x03;
return ((unsigned long)hose->cfg_data) + offset;
}
static int __pmac macrisc_read_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 *val)
{
struct pci_controller *hose;
unsigned long addr;
hose = pci_bus_to_host(bus);
if (hose == NULL)
return PCIBIOS_DEVICE_NOT_FOUND;
addr = macrisc_cfg_access(hose, bus->number, devfn, offset);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
switch (len) {
case 1:
*val = in_8((u8 *)addr);
break;
case 2:
*val = in_le16((u16 *)addr);
break;
default:
*val = in_le32((u32 *)addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static int __pmac macrisc_write_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 val)
{
struct pci_controller *hose;
unsigned long addr;
hose = pci_bus_to_host(bus);
if (hose == NULL)
return PCIBIOS_DEVICE_NOT_FOUND;
addr = macrisc_cfg_access(hose, bus->number, devfn, offset);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
switch (len) {
case 1:
out_8((u8 *)addr, val);
(void) in_8((u8 *)addr);
break;
case 2:
out_le16((u16 *)addr, val);
(void) in_le16((u16 *)addr);
break;
default:
out_le32((u32 *)addr, val);
(void) in_le32((u32 *)addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops macrisc_pci_ops =
{
macrisc_read_config,
macrisc_write_config
};
/*
* These versions of U3 HyperTransport config space access ops do not
* implement self-view of the HT host yet
*/
/*
* This function deals with some "special cases" devices.
*
* 0 -> No special case
* 1 -> Skip the device but act as if the access was successfull
* (return 0xff's on reads, eventually, cache config space
* accesses in a later version)
* -1 -> Hide the device (unsuccessful acess)
*/
static int u3_ht_skip_device(struct pci_controller *hose,
struct pci_bus *bus, unsigned int devfn)
{
struct device_node *busdn, *dn;
int i;
/* We only allow config cycles to devices that are in OF device-tree
* as we are apparently having some weird things going on with some
* revs of K2 on recent G5s
*/
if (bus->self)
busdn = pci_device_to_OF_node(bus->self);
else
busdn = hose->arch_data;
for (dn = busdn->child; dn; dn = dn->sibling)
if (dn->devfn == devfn)
break;
if (dn == NULL)
return -1;
/*
* When a device in K2 is powered down, we die on config
* cycle accesses. Fix that here.
*/
for (i=0; i<2; i++)
if (k2_skiplist[i] == dn)
return 1;
return 0;
}
#define U3_HT_CFA0(devfn, off) \
((((unsigned long)devfn) << 8) | offset)
#define U3_HT_CFA1(bus, devfn, off) \
(U3_HT_CFA0(devfn, off) \
+ (((unsigned long)bus) << 16) \
+ 0x01000000UL)
static unsigned long __pmac u3_ht_cfg_access(struct pci_controller* hose,
u8 bus, u8 devfn, u8 offset)
{
if (bus == hose->first_busno) {
/* For now, we don't self probe U3 HT bridge */
if (PCI_SLOT(devfn) == 0)
return 0;
return ((unsigned long)hose->cfg_data) + U3_HT_CFA0(devfn, offset);
} else
return ((unsigned long)hose->cfg_data) + U3_HT_CFA1(bus, devfn, offset);
}
static int __pmac u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 *val)
{
struct pci_controller *hose;
unsigned long addr;
hose = pci_bus_to_host(bus);
if (hose == NULL)
return PCIBIOS_DEVICE_NOT_FOUND;
addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
switch (u3_ht_skip_device(hose, bus, devfn)) {
case 0:
break;
case 1:
switch (len) {
case 1:
*val = 0xff; break;
case 2:
*val = 0xffff; break;
default:
*val = 0xfffffffful; break;
}
return PCIBIOS_SUCCESSFUL;
default:
return PCIBIOS_DEVICE_NOT_FOUND;
}
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
switch (len) {
case 1:
*val = in_8((u8 *)addr);
break;
case 2:
*val = in_le16((u16 *)addr);
break;
default:
*val = in_le32((u32 *)addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static int __pmac u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 val)
{
struct pci_controller *hose;
unsigned long addr;
hose = pci_bus_to_host(bus);
if (hose == NULL)
return PCIBIOS_DEVICE_NOT_FOUND;
addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
switch (u3_ht_skip_device(hose, bus, devfn)) {
case 0:
break;
case 1:
return PCIBIOS_SUCCESSFUL;
default:
return PCIBIOS_DEVICE_NOT_FOUND;
}
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
switch (len) {
case 1:
out_8((u8 *)addr, val);
(void) in_8((u8 *)addr);
break;
case 2:
out_le16((u16 *)addr, val);
(void) in_le16((u16 *)addr);
break;
default:
out_le32((u32 *)addr, val);
(void) in_le32((u32 *)addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops u3_ht_pci_ops =
{
u3_ht_read_config,
u3_ht_write_config
};
static void __init setup_u3_agp(struct pci_controller* hose)
{
/* On G5, we move AGP up to high bus number so we don't need
* to reassign bus numbers for HT. If we ever have P2P bridges
* on AGP, we'll have to move pci_assign_all_busses to the
* pci_controller structure so we enable it for AGP and not for
* HT childs.
* We hard code the address because of the different size of
* the reg address cell, we shall fix that by killing struct
* reg_property and using some accessor functions instead
*/
hose->first_busno = 0xf0;
hose->last_busno = 0xff;
has_uninorth = 1;
hose->ops = &macrisc_pci_ops;
hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);
u3_agp = hose;
}
static void __init setup_u3_ht(struct pci_controller* hose)
{
struct device_node *np = (struct device_node *)hose->arch_data;
int i, cur;
hose->ops = &u3_ht_pci_ops;
/* We hard code the address because of the different size of
* the reg address cell, we shall fix that by killing struct
* reg_property and using some accessor functions instead
*/
hose->cfg_data = (volatile unsigned char *)ioremap(0xf2000000, 0x02000000);
/*
* /ht node doesn't expose a "ranges" property, so we "remove" regions that
* have been allocated to AGP. So far, this version of the code doesn't assign
* any of the 0xfxxxxxxx "fine" memory regions to /ht.
* We need to fix that sooner or later by either parsing all child "ranges"
* properties or figuring out the U3 address space decoding logic and
* then read it's configuration register (if any).
*/
hose->io_base_phys = 0xf4000000;
hose->io_base_virt = ioremap(hose->io_base_phys, 0x00400000);
isa_io_base = pci_io_base = (unsigned long) hose->io_base_virt;
hose->io_resource.name = np->full_name;
hose->io_resource.start = 0;
hose->io_resource.end = 0x003fffff;
hose->io_resource.flags = IORESOURCE_IO;
hose->pci_mem_offset = 0;
hose->first_busno = 0;
hose->last_busno = 0xef;
hose->mem_resources[0].name = np->full_name;
hose->mem_resources[0].start = 0x80000000;
hose->mem_resources[0].end = 0xefffffff;
hose->mem_resources[0].flags = IORESOURCE_MEM;
if (u3_agp == NULL) {
DBG("U3 has no AGP, using full resource range\n");
return;
}
/* We "remove" the AGP resources from the resources allocated to HT, that
* is we create "holes". However, that code does assumptions that so far
* happen to be true (cross fingers...), typically that resources in the
* AGP node are properly ordered
*/
cur = 0;
for (i=0; i<3; i++) {
struct resource *res = &u3_agp->mem_resources[i];
if (res->flags != IORESOURCE_MEM)
continue;
/* We don't care about "fine" resources */
if (res->start >= 0xf0000000)
continue;
/* Check if it's just a matter of "shrinking" us in one direction */
if (hose->mem_resources[cur].start == res->start) {
DBG("U3/HT: shrink start of %d, %08lx -> %08lx\n",
cur, hose->mem_resources[cur].start, res->end + 1);
hose->mem_resources[cur].start = res->end + 1;
continue;
}
if (hose->mem_resources[cur].end == res->end) {
DBG("U3/HT: shrink end of %d, %08lx -> %08lx\n",
cur, hose->mem_resources[cur].end, res->start - 1);
hose->mem_resources[cur].end = res->start - 1;
continue;
}
/* No, it's not the case, we need a hole */
if (cur == 2) {
/* not enough resources for a hole, we drop part of the range */
printk(KERN_WARNING "Running out of resources for /ht host !\n");
hose->mem_resources[cur].end = res->start - 1;
continue;
}
cur++;
DBG("U3/HT: hole, %d end at %08lx, %d start at %08lx\n",
cur-1, res->start - 1, cur, res->end + 1);
hose->mem_resources[cur].name = np->full_name;
hose->mem_resources[cur].flags = IORESOURCE_MEM;
hose->mem_resources[cur].start = res->end + 1;
hose->mem_resources[cur].end = hose->mem_resources[cur-1].end;
hose->mem_resources[cur-1].end = res->start - 1;
}
}
static void __init pmac_process_bridge_OF_ranges(struct pci_controller *hose,
struct device_node *dev, int primary)
{
static unsigned int static_lc_ranges[2024];
unsigned int *dt_ranges, *lc_ranges, *ranges, *prev;
unsigned int size;
int rlen = 0, orig_rlen;
int memno = 0;
struct resource *res;
int np, na = prom_n_addr_cells(dev);
np = na + 5;
/* First we try to merge ranges to fix a problem with some pmacs
* that can have more than 3 ranges, fortunately using contiguous
* addresses -- BenH
*/
dt_ranges = (unsigned int *) get_property(dev, "ranges", &rlen);
if (!dt_ranges)
return;
/* lc_ranges = alloc_bootmem(rlen);*/
lc_ranges = static_lc_ranges;
if (!lc_ranges)
return; /* what can we do here ? */
memcpy(lc_ranges, dt_ranges, rlen);
orig_rlen = rlen;
/* Let's work on a copy of the "ranges" property instead of damaging
* the device-tree image in memory
*/
ranges = lc_ranges;
prev = NULL;
while ((rlen -= np * sizeof(unsigned int)) >= 0) {
if (prev) {
if (prev[0] == ranges[0] && prev[1] == ranges[1] &&
(prev[2] + prev[na+4]) == ranges[2] &&
(prev[na+2] + prev[na+4]) == ranges[na+2]) {
prev[na+4] += ranges[na+4];
ranges[0] = 0;
ranges += np;
continue;
}
}
prev = ranges;
ranges += np;
}
/*
* The ranges property is laid out as an array of elements,
* each of which comprises:
* cells 0 - 2: a PCI address
* cells 3 or 3+4: a CPU physical address
* (size depending on dev->n_addr_cells)
* cells 4+5 or 5+6: the size of the range
*/
ranges = lc_ranges;
rlen = orig_rlen;
while (ranges && (rlen -= np * sizeof(unsigned int)) >= 0) {
res = NULL;
size = ranges[na+4];
switch (ranges[0] >> 24) {
case 1: /* I/O space */
if (ranges[2] != 0)
break;
hose->io_base_phys = ranges[na+2];
/* limit I/O space to 16MB */
if (size > 0x01000000)
size = 0x01000000;
hose->io_base_virt = ioremap(ranges[na+2], size);
if (primary)
isa_io_base = (unsigned long) hose->io_base_virt;
res = &hose->io_resource;
res->flags = IORESOURCE_IO;
res->start = ranges[2];
break;
case 2: /* memory space */
memno = 0;
if (ranges[1] == 0 && ranges[2] == 0
&& ranges[na+4] <= (16 << 20)) {
/* 1st 16MB, i.e. ISA memory area */
#if 0
if (primary)
isa_mem_base = ranges[na+2];
#endif
memno = 1;
}
while (memno < 3 && hose->mem_resources[memno].flags)
++memno;
if (memno == 0)
hose->pci_mem_offset = ranges[na+2] - ranges[2];
if (memno < 3) {
res = &hose->mem_resources[memno];
res->flags = IORESOURCE_MEM;
res->start = ranges[na+2];
}
break;
}
if (res != NULL) {
res->name = dev->full_name;
res->end = res->start + size - 1;
res->parent = NULL;
res->sibling = NULL;
res->child = NULL;
}
ranges += np;
}
}
/*
* We assume that if we have a G3 powermac, we have one bridge called
* "pci" (a MPC106) and no bandit or chaos bridges, and contrariwise,
* if we have one or more bandit or chaos bridges, we don't have a MPC106.
*/
static int __init add_bridge(struct device_node *dev)
{
int len;
struct pci_controller *hose;
char* disp_name;
int *bus_range;
int primary = 1;
struct property *of_prop;
DBG("Adding PCI host bridge %s\n", dev->full_name);
bus_range = (int *) get_property(dev, "bus-range", &len);
if (bus_range == NULL || len < 2 * sizeof(int)) {
printk(KERN_WARNING "Can't get bus-range for %s, assume bus 0\n",
dev->full_name);
}
hose = alloc_bootmem(sizeof(struct pci_controller));
if (hose == NULL)
return -ENOMEM;
pci_setup_pci_controller(hose);
hose->arch_data = dev;
hose->first_busno = bus_range ? bus_range[0] : 0;
hose->last_busno = bus_range ? bus_range[1] : 0xff;
of_prop = alloc_bootmem(sizeof(struct property) +
sizeof(hose->global_number));
if (of_prop) {
memset(of_prop, 0, sizeof(struct property));
of_prop->name = "linux,pci-domain";
of_prop->length = sizeof(hose->global_number);
of_prop->value = (unsigned char *)&of_prop[1];
memcpy(of_prop->value, &hose->global_number, sizeof(hose->global_number));
prom_add_property(dev, of_prop);
}
disp_name = NULL;
if (device_is_compatible(dev, "u3-agp")) {
setup_u3_agp(hose);
disp_name = "U3-AGP";
primary = 0;
} else if (device_is_compatible(dev, "u3-ht")) {
setup_u3_ht(hose);
disp_name = "U3-HT";
primary = 1;
}
printk(KERN_INFO "Found %s PCI host bridge. Firmware bus number: %d->%d\n",
disp_name, hose->first_busno, hose->last_busno);
/* Interpret the "ranges" property */
/* This also maps the I/O region and sets isa_io/mem_base */
pmac_process_bridge_OF_ranges(hose, dev, primary);
/* Fixup "bus-range" OF property */
fixup_bus_range(dev);
return 0;
}
/*
* We use our own read_irq_line here because PCI_INTERRUPT_PIN is
* crap on some of Apple ASICs. We unconditionally use the Open Firmware
* interrupt number as this is always right.
*/
static int pmac_pci_read_irq_line(struct pci_dev *pci_dev)
{
struct device_node *node;
node = pci_device_to_OF_node(pci_dev);
if (node == NULL)
return -1;
if (node->n_intrs == 0)
return -1;
pci_dev->irq = node->intrs[0].line;
pci_write_config_byte(pci_dev, PCI_INTERRUPT_LINE, pci_dev->irq);
return 0;
}
void __init pmac_pcibios_fixup(void)
{
struct pci_dev *dev = NULL;
for_each_pci_dev(dev)
pmac_pci_read_irq_line(dev);
}
static void __init pmac_fixup_phb_resources(void)
{
struct pci_controller *hose, *tmp;
list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
unsigned long offset = (unsigned long)hose->io_base_virt - pci_io_base;
hose->io_resource.start += offset;
hose->io_resource.end += offset;
printk(KERN_INFO "PCI Host %d, io start: %lx; io end: %lx\n",
hose->global_number,
hose->io_resource.start, hose->io_resource.end);
}
}
void __init pmac_pci_init(void)
{
struct device_node *np, *root;
struct device_node *ht = NULL;
/* Probe root PCI hosts, that is on U3 the AGP host and the
* HyperTransport host. That one is actually "kept" around
* and actually added last as it's resource management relies
* on the AGP resources to have been setup first
*/
root = of_find_node_by_path("/");
if (root == NULL) {
printk(KERN_CRIT "pmac_find_bridges: can't find root of device tree\n");
return;
}
for (np = NULL; (np = of_get_next_child(root, np)) != NULL;) {
if (np->name == NULL)
continue;
if (strcmp(np->name, "pci") == 0) {
if (add_bridge(np) == 0)
of_node_get(np);
}
if (strcmp(np->name, "ht") == 0) {
of_node_get(np);
ht = np;
}
}
of_node_put(root);
/* Now setup the HyperTransport host if we found any
*/
if (ht && add_bridge(ht) != 0)
of_node_put(ht);
/* Fixup the IO resources on our host bridges as the common code
* does it only for childs of the host bridges
*/
pmac_fixup_phb_resources();
/* Setup the linkage between OF nodes and PHBs */
pci_devs_phb_init();
/* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
* assume there is no P2P bridge on the AGP bus, which should be a
* safe assumptions hopefully.
*/
if (u3_agp) {
struct device_node *np = u3_agp->arch_data;
np->busno = 0xf0;
for (np = np->child; np; np = np->sibling)
np->busno = 0xf0;
}
pmac_check_ht_link();
/* Tell pci.c to not use the common resource allocation mecanism */
pci_probe_only = 1;
/* Allow all IO */
io_page_mask = -1;
}
/*
* Disable second function on K2-SATA, it's broken
* and disable IO BARs on first one
*/
static void fixup_k2_sata(struct pci_dev* dev)
{
int i;
u16 cmd;
if (PCI_FUNC(dev->devfn) > 0) {
pci_read_config_word(dev, PCI_COMMAND, &cmd);
cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
pci_write_config_word(dev, PCI_COMMAND, cmd);
for (i = 0; i < 6; i++) {
dev->resource[i].start = dev->resource[i].end = 0;
dev->resource[i].flags = 0;
pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, 0);
}
} else {
pci_read_config_word(dev, PCI_COMMAND, &cmd);
cmd &= ~PCI_COMMAND_IO;
pci_write_config_word(dev, PCI_COMMAND, cmd);
for (i = 0; i < 5; i++) {
dev->resource[i].start = dev->resource[i].end = 0;
dev->resource[i].flags = 0;
pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, 0);
}
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SERVERWORKS, 0x0240, fixup_k2_sata);
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