linux-stable-rt/arch/powerpc/platforms/iseries/vio.c

554 lines
14 KiB
C

/*
* Legacy iSeries specific vio initialisation
* that needs to be built in (not a module).
*
* © Copyright 2007 IBM Corporation
* Author: Stephen Rothwell
* Some parts collected from various other files
*
* 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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/of.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/completion.h>
#include <linux/proc_fs.h>
#include <linux/module.h>
#include <asm/firmware.h>
#include <asm/vio.h>
#include <asm/iseries/vio.h>
#include <asm/iseries/iommu.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_event.h>
#define FIRST_VTY 0
#define NUM_VTYS 1
#define FIRST_VSCSI (FIRST_VTY + NUM_VTYS)
#define NUM_VSCSIS 1
#define FIRST_VLAN (FIRST_VSCSI + NUM_VSCSIS)
#define NUM_VLANS HVMAXARCHITECTEDVIRTUALLANS
#define FIRST_VIODASD (FIRST_VLAN + NUM_VLANS)
#define NUM_VIODASDS HVMAXARCHITECTEDVIRTUALDISKS
#define FIRST_VIOCD (FIRST_VIODASD + NUM_VIODASDS)
#define NUM_VIOCDS HVMAXARCHITECTEDVIRTUALCDROMS
#define FIRST_VIOTAPE (FIRST_VIOCD + NUM_VIOCDS)
#define NUM_VIOTAPES HVMAXARCHITECTEDVIRTUALTAPES
struct vio_waitevent {
struct completion com;
int rc;
u16 sub_result;
};
struct vio_resource {
char rsrcname[10];
char type[4];
char model[3];
};
static struct property *new_property(const char *name, int length,
const void *value)
{
struct property *np = kzalloc(sizeof(*np) + strlen(name) + 1 + length,
GFP_KERNEL);
if (!np)
return NULL;
np->name = (char *)(np + 1);
np->value = np->name + strlen(name) + 1;
strcpy(np->name, name);
memcpy(np->value, value, length);
np->length = length;
return np;
}
static void __init free_property(struct property *np)
{
kfree(np);
}
static struct device_node *new_node(const char *path,
struct device_node *parent)
{
struct device_node *np = kzalloc(sizeof(*np), GFP_KERNEL);
if (!np)
return NULL;
np->full_name = kmalloc(strlen(path) + 1, GFP_KERNEL);
if (!np->full_name) {
kfree(np);
return NULL;
}
strcpy(np->full_name, path);
of_node_set_flag(np, OF_DYNAMIC);
kref_init(&np->kref);
np->parent = of_node_get(parent);
return np;
}
static void free_node(struct device_node *np)
{
struct property *next;
struct property *prop;
next = np->properties;
while (next) {
prop = next;
next = prop->next;
free_property(prop);
}
of_node_put(np->parent);
kfree(np->full_name);
kfree(np);
}
static int add_string_property(struct device_node *np, const char *name,
const char *value)
{
struct property *nprop = new_property(name, strlen(value) + 1, value);
if (!nprop)
return 0;
prom_add_property(np, nprop);
return 1;
}
static int add_raw_property(struct device_node *np, const char *name,
int length, const void *value)
{
struct property *nprop = new_property(name, length, value);
if (!nprop)
return 0;
prom_add_property(np, nprop);
return 1;
}
static struct device_node *do_device_node(struct device_node *parent,
const char *name, u32 reg, u32 unit, const char *type,
const char *compat, struct vio_resource *res)
{
struct device_node *np;
char path[32];
snprintf(path, sizeof(path), "/vdevice/%s@%08x", name, reg);
np = new_node(path, parent);
if (!np)
return NULL;
if (!add_string_property(np, "name", name) ||
!add_string_property(np, "device_type", type) ||
!add_string_property(np, "compatible", compat) ||
!add_raw_property(np, "reg", sizeof(reg), &reg) ||
!add_raw_property(np, "linux,unit_address",
sizeof(unit), &unit)) {
goto node_free;
}
if (res) {
if (!add_raw_property(np, "linux,vio_rsrcname",
sizeof(res->rsrcname), res->rsrcname) ||
!add_raw_property(np, "linux,vio_type",
sizeof(res->type), res->type) ||
!add_raw_property(np, "linux,vio_model",
sizeof(res->model), res->model))
goto node_free;
}
np->name = of_get_property(np, "name", NULL);
np->type = of_get_property(np, "device_type", NULL);
of_attach_node(np);
#ifdef CONFIG_PROC_DEVICETREE
if (parent->pde) {
struct proc_dir_entry *ent;
ent = proc_mkdir(strrchr(np->full_name, '/') + 1, parent->pde);
if (ent)
proc_device_tree_add_node(np, ent);
}
#endif
return np;
node_free:
free_node(np);
return NULL;
}
/*
* This is here so that we can dynamically add viodasd
* devices without exposing all the above infrastructure.
*/
struct vio_dev *vio_create_viodasd(u32 unit)
{
struct device_node *vio_root;
struct device_node *np;
struct vio_dev *vdev = NULL;
vio_root = of_find_node_by_path("/vdevice");
if (!vio_root)
return NULL;
np = do_device_node(vio_root, "viodasd", FIRST_VIODASD + unit, unit,
"block", "IBM,iSeries-viodasd", NULL);
of_node_put(vio_root);
if (np) {
vdev = vio_register_device_node(np);
if (!vdev)
free_node(np);
}
return vdev;
}
EXPORT_SYMBOL_GPL(vio_create_viodasd);
static void __init handle_block_event(struct HvLpEvent *event)
{
struct vioblocklpevent *bevent = (struct vioblocklpevent *)event;
struct vio_waitevent *pwe;
if (event == NULL)
/* Notification that a partition went away! */
return;
/* First, we should NEVER get an int here...only acks */
if (hvlpevent_is_int(event)) {
printk(KERN_WARNING "handle_viod_request: "
"Yikes! got an int in viodasd event handler!\n");
if (hvlpevent_need_ack(event)) {
event->xRc = HvLpEvent_Rc_InvalidSubtype;
HvCallEvent_ackLpEvent(event);
}
return;
}
switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
case vioblockopen:
/*
* Handle a response to an open request. We get all the
* disk information in the response, so update it. The
* correlation token contains a pointer to a waitevent
* structure that has a completion in it. update the
* return code in the waitevent structure and post the
* completion to wake up the guy who sent the request
*/
pwe = (struct vio_waitevent *)event->xCorrelationToken;
pwe->rc = event->xRc;
pwe->sub_result = bevent->sub_result;
complete(&pwe->com);
break;
case vioblockclose:
break;
default:
printk(KERN_WARNING "handle_viod_request: unexpected subtype!");
if (hvlpevent_need_ack(event)) {
event->xRc = HvLpEvent_Rc_InvalidSubtype;
HvCallEvent_ackLpEvent(event);
}
}
}
static void __init probe_disk(struct device_node *vio_root, u32 unit)
{
HvLpEvent_Rc hvrc;
struct vio_waitevent we;
u16 flags = 0;
retry:
init_completion(&we.com);
/* Send the open event to OS/400 */
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_blockio | vioblockopen,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)(unsigned long)&we, VIOVERSION << 16,
((u64)unit << 48) | ((u64)flags<< 32),
0, 0, 0);
if (hvrc != 0) {
printk(KERN_WARNING "probe_disk: bad rc on HV open %d\n",
(int)hvrc);
return;
}
wait_for_completion(&we.com);
if (we.rc != 0) {
if (flags != 0)
return;
/* try again with read only flag set */
flags = vioblockflags_ro;
goto retry;
}
/* Send the close event to OS/400. We DON'T expect a response */
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_blockio | vioblockclose,
HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
0, VIOVERSION << 16,
((u64)unit << 48) | ((u64)flags << 32),
0, 0, 0);
if (hvrc != 0) {
printk(KERN_WARNING "probe_disk: "
"bad rc sending event to OS/400 %d\n", (int)hvrc);
return;
}
do_device_node(vio_root, "viodasd", FIRST_VIODASD + unit, unit,
"block", "IBM,iSeries-viodasd", NULL);
}
static void __init get_viodasd_info(struct device_node *vio_root)
{
int rc;
u32 unit;
rc = viopath_open(viopath_hostLp, viomajorsubtype_blockio, 2);
if (rc) {
printk(KERN_WARNING "get_viodasd_info: "
"error opening path to host partition %d\n",
viopath_hostLp);
return;
}
/* Initialize our request handler */
vio_setHandler(viomajorsubtype_blockio, handle_block_event);
for (unit = 0; unit < HVMAXARCHITECTEDVIRTUALDISKS; unit++)
probe_disk(vio_root, unit);
vio_clearHandler(viomajorsubtype_blockio);
viopath_close(viopath_hostLp, viomajorsubtype_blockio, 2);
}
static void __init handle_cd_event(struct HvLpEvent *event)
{
struct viocdlpevent *bevent;
struct vio_waitevent *pwe;
if (!event)
/* Notification that a partition went away! */
return;
/* First, we should NEVER get an int here...only acks */
if (hvlpevent_is_int(event)) {
printk(KERN_WARNING "handle_cd_event: got an unexpected int\n");
if (hvlpevent_need_ack(event)) {
event->xRc = HvLpEvent_Rc_InvalidSubtype;
HvCallEvent_ackLpEvent(event);
}
return;
}
bevent = (struct viocdlpevent *)event;
switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
case viocdgetinfo:
pwe = (struct vio_waitevent *)event->xCorrelationToken;
pwe->rc = event->xRc;
pwe->sub_result = bevent->sub_result;
complete(&pwe->com);
break;
default:
printk(KERN_WARNING "handle_cd_event: "
"message with unexpected subtype %0x04X!\n",
event->xSubtype & VIOMINOR_SUBTYPE_MASK);
if (hvlpevent_need_ack(event)) {
event->xRc = HvLpEvent_Rc_InvalidSubtype;
HvCallEvent_ackLpEvent(event);
}
}
}
static void __init get_viocd_info(struct device_node *vio_root)
{
HvLpEvent_Rc hvrc;
u32 unit;
struct vio_waitevent we;
struct vio_resource *unitinfo;
dma_addr_t unitinfo_dmaaddr;
int ret;
ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio, 2);
if (ret) {
printk(KERN_WARNING
"get_viocd_info: error opening path to host partition %d\n",
viopath_hostLp);
return;
}
/* Initialize our request handler */
vio_setHandler(viomajorsubtype_cdio, handle_cd_event);
unitinfo = iseries_hv_alloc(
sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS,
&unitinfo_dmaaddr, GFP_ATOMIC);
if (!unitinfo) {
printk(KERN_WARNING
"get_viocd_info: error allocating unitinfo\n");
goto clear_handler;
}
memset(unitinfo, 0, sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS);
init_completion(&we.com);
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_cdio | viocdgetinfo,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS, 0);
if (hvrc != HvLpEvent_Rc_Good) {
printk(KERN_WARNING
"get_viocd_info: cdrom error sending event. rc %d\n",
(int)hvrc);
goto hv_free;
}
wait_for_completion(&we.com);
if (we.rc) {
printk(KERN_WARNING "get_viocd_info: bad rc %d:0x%04X\n",
we.rc, we.sub_result);
goto hv_free;
}
for (unit = 0; (unit < HVMAXARCHITECTEDVIRTUALCDROMS) &&
unitinfo[unit].rsrcname[0]; unit++) {
if (!do_device_node(vio_root, "viocd", FIRST_VIOCD + unit, unit,
"block", "IBM,iSeries-viocd", &unitinfo[unit]))
break;
}
hv_free:
iseries_hv_free(sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALCDROMS,
unitinfo, unitinfo_dmaaddr);
clear_handler:
vio_clearHandler(viomajorsubtype_cdio);
viopath_close(viopath_hostLp, viomajorsubtype_cdio, 2);
}
/* Handle interrupt events for tape */
static void __init handle_tape_event(struct HvLpEvent *event)
{
struct vio_waitevent *we;
struct viotapelpevent *tevent = (struct viotapelpevent *)event;
if (event == NULL)
/* Notification that a partition went away! */
return;
we = (struct vio_waitevent *)event->xCorrelationToken;
switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
case viotapegetinfo:
we->rc = tevent->sub_type_result;
complete(&we->com);
break;
default:
printk(KERN_WARNING "handle_tape_event: weird ack\n");
}
}
static void __init get_viotape_info(struct device_node *vio_root)
{
HvLpEvent_Rc hvrc;
u32 unit;
struct vio_resource *unitinfo;
dma_addr_t unitinfo_dmaaddr;
size_t len = sizeof(*unitinfo) * HVMAXARCHITECTEDVIRTUALTAPES;
struct vio_waitevent we;
int ret;
ret = viopath_open(viopath_hostLp, viomajorsubtype_tape, 2);
if (ret) {
printk(KERN_WARNING "get_viotape_info: "
"error on viopath_open to hostlp %d\n", ret);
return;
}
vio_setHandler(viomajorsubtype_tape, handle_tape_event);
unitinfo = iseries_hv_alloc(len, &unitinfo_dmaaddr, GFP_ATOMIC);
if (!unitinfo)
goto clear_handler;
memset(unitinfo, 0, len);
hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
HvLpEvent_Type_VirtualIo,
viomajorsubtype_tape | viotapegetinfo,
HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
viopath_sourceinst(viopath_hostLp),
viopath_targetinst(viopath_hostLp),
(u64)(unsigned long)&we, VIOVERSION << 16,
unitinfo_dmaaddr, len, 0, 0);
if (hvrc != HvLpEvent_Rc_Good) {
printk(KERN_WARNING "get_viotape_info: hv error on op %d\n",
(int)hvrc);
goto hv_free;
}
wait_for_completion(&we.com);
for (unit = 0; (unit < HVMAXARCHITECTEDVIRTUALTAPES) &&
unitinfo[unit].rsrcname[0]; unit++) {
if (!do_device_node(vio_root, "viotape", FIRST_VIOTAPE + unit,
unit, "byte", "IBM,iSeries-viotape",
&unitinfo[unit]))
break;
}
hv_free:
iseries_hv_free(len, unitinfo, unitinfo_dmaaddr);
clear_handler:
vio_clearHandler(viomajorsubtype_tape);
viopath_close(viopath_hostLp, viomajorsubtype_tape, 2);
}
static int __init iseries_vio_init(void)
{
struct device_node *vio_root;
if (!firmware_has_feature(FW_FEATURE_ISERIES))
return -ENODEV;
iommu_vio_init();
vio_root = of_find_node_by_path("/vdevice");
if (!vio_root)
return -ENODEV;
if (viopath_hostLp == HvLpIndexInvalid) {
vio_set_hostlp();
/* If we don't have a host, bail out */
if (viopath_hostLp == HvLpIndexInvalid)
goto put_node;
}
get_viodasd_info(vio_root);
get_viocd_info(vio_root);
get_viotape_info(vio_root);
return 0;
put_node:
of_node_put(vio_root);
return -ENODEV;
}
arch_initcall(iseries_vio_init);