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/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <skiboot.h>
#include <fsp.h>
#include <opal.h>
#include <device.h>
#include <lock.h>
#include <processor.h>
#include <psi.h>
#include <opal-msg.h>
#include <fsp-sysparam.h>
struct sysparam_comp_data {
uint32_t param_len;
uint64_t async_token;
};
struct sysparam_req {
sysparam_compl_t completion;
void *comp_data;
void *ubuf;
uint32_t ulen;
struct fsp_msg msg;
struct fsp_msg resp;
bool done;
};
static struct sysparam_attr {
const char *name;
uint32_t id;
uint32_t length;
uint8_t perm;
} sysparam_attrs[] = {
#define _R OPAL_SYSPARAM_READ
#define _W OPAL_SYSPARAM_WRITE
#define _RW OPAL_SYSPARAM_RW
{"surveillance", SYS_PARAM_SURV, 4, _RW},
{"hmc-management", SYS_PARAM_HMC_MANAGED, 4, _R},
{"cupd-policy", SYS_PARAM_FLASH_POLICY, 4, _RW},
{"plat-hmc-managed", SYS_PARAM_NEED_HMC, 4, _RW},
{"fw-license-policy", SYS_PARAM_FW_LICENSE, 4, _RW},
{"world-wide-port-num", SYS_PARAM_WWPN, 12, _W},
{"default-boot-device", SYS_PARAM_DEF_BOOT_DEV, 1, _RW},
{"next-boot-device", SYS_PARAM_NEXT_BOOT_DEV,1, _RW},
{"console-select", SYS_PARAM_CONSOLE_SELECT,1, _RW}
#undef _R
#undef _W
#undef _RW
};
static int fsp_sysparam_process(struct sysparam_req *r)
{
u32 param_id, len;
int stlen = 0;
u8 fstat;
/* Snapshot completion before we set the "done" flag */
sysparam_compl_t comp = r->completion;
void *cdata = r->comp_data;
if (r->msg.state != fsp_msg_done) {
prerror("FSP: Request for sysparam 0x%x got FSP failure!\n",
r->msg.data.words[0]);
stlen = -1; /* XXX Find saner error codes */
goto complete;
}
param_id = r->resp.data.words[0];
len = r->resp.data.words[1] & 0xffff;
/* Check params validity */
if (param_id != r->msg.data.words[0]) {
prerror("FSP: Request for sysparam 0x%x got resp. for 0x%x!\n",
r->msg.data.words[0], param_id);
stlen = -2; /* XXX Sane error codes */
goto complete;
}
if (len > r->ulen) {
prerror("FSP: Request for sysparam 0x%x truncated!\n",
param_id);
len = r->ulen;
}
/* Decode the request status */
fstat = (r->msg.resp->word1 >> 8) & 0xff;
switch(fstat) {
case 0x00: /* XXX Is that even possible ? */
case 0x11: /* Data in request */
memcpy(r->ubuf, &r->resp.data.words[2], len);
/* pass through */
case 0x12: /* Data in TCE */
stlen = len;
break;
default:
stlen = -fstat;
}
complete:
/* Call completion if any */
if (comp)
comp(r->msg.data.words[0], stlen, cdata);
free(r);
return stlen;
}
static void fsp_sysparam_get_complete(struct fsp_msg *msg)
{
struct sysparam_req *r = container_of(msg, struct sysparam_req, msg);
/* If it's an asynchronous request, process it now */
if (r->completion) {
fsp_sysparam_process(r);
return;
}
/* Else just set the done flag */
/* Another CPU can be polling on the "done" flag without the
* lock held, so let's order the udpates to the structure
*/
lwsync();
r->done = true;
}
int fsp_get_sys_param(uint32_t param_id, void *buffer, uint32_t length,
sysparam_compl_t async_complete, void *comp_data)
{
struct sysparam_req *r;
uint64_t baddr, tce_token;
int rc;
if (!fsp_present())
return -ENODEV;
/*
* XXX FIXME: We currently always allocate the sysparam_req here
* however, we want to avoid runtime allocations as much as
* possible, so if this is going to be used a lot at runtime,
* we probably want to pre-allocate a pool of these
*/
r = zalloc(sizeof(struct sysparam_req));
if (!r)
return -ENOMEM;
if (length > 4096)
return -EINVAL;
r->completion = async_complete;
r->comp_data = comp_data;
r->done = false;
r->ubuf = buffer;
r->ulen = length;
r->msg.resp = &r->resp;
/* Map always 1 page ... easier that way and none of that
* is performance critical
*/
baddr = (uint64_t)buffer;
fsp_tce_map(PSI_DMA_GET_SYSPARAM, (void *)(baddr & ~0xffful), 0x1000);
tce_token = PSI_DMA_GET_SYSPARAM | (baddr & 0xfff);
fsp_fillmsg(&r->msg, FSP_CMD_QUERY_SPARM, 3,
param_id, length, tce_token);
rc = fsp_queue_msg(&r->msg, fsp_sysparam_get_complete);
/* Asynchronous operation or queueing failure, return */
if (rc || async_complete)
return rc;
/* Synchronous operation requested, spin and process */
while(!r->done)
opal_run_pollers();
/* Will free the request */
return fsp_sysparam_process(r);
}
static void fsp_opal_getparam_complete(uint32_t param_id __unused, int err_len,
void *data)
{
struct sysparam_comp_data *comp_data = data;
int rc = OPAL_SUCCESS;
if (comp_data->param_len != err_len)
rc = OPAL_INTERNAL_ERROR;
opal_queue_msg(OPAL_MSG_ASYNC_COMP, NULL, NULL,
comp_data->async_token, rc);
free(comp_data);
}
static void fsp_opal_setparam_complete(struct fsp_msg *msg)
{
struct sysparam_comp_data *comp_data = msg->user_data;
u8 fstat;
uint32_t param_id;
int rc = OPAL_SUCCESS;
if (msg->state != fsp_msg_done) {
prerror("FSP: Request for set sysparam 0x%x got FSP failure!\n",
msg->data.words[0]);
rc = OPAL_INTERNAL_ERROR;
goto out;
}
param_id = msg->resp->data.words[0];
if (param_id != msg->data.words[0]) {
prerror("FSP: Request for set sysparam 0x%x got resp. for 0x%x!"
"\n", msg->data.words[0], param_id);
rc = OPAL_INTERNAL_ERROR;
goto out;
}
fstat = (msg->resp->word1 >> 8) & 0xff;
switch (fstat) {
case 0x00:
rc = OPAL_SUCCESS;
break;
case 0x22:
prerror("%s: Response status 0x%x, invalid data\n", __func__,
fstat);
rc = OPAL_INTERNAL_ERROR;
break;
case 0x24:
prerror("%s: Response status 0x%x, DMA error\n", __func__,
fstat);
rc = OPAL_INTERNAL_ERROR;
break;
default:
rc = OPAL_INTERNAL_ERROR;
break;
}
out:
opal_queue_msg(OPAL_MSG_ASYNC_COMP, NULL, NULL,
comp_data->async_token, rc);
free(comp_data);
fsp_freemsg(msg);
}
/* OPAL interface for PowerNV to read the system parameter from FSP */
static int64_t fsp_opal_get_param(uint64_t async_token, uint32_t param_id,
uint64_t buffer, uint64_t length)
{
struct sysparam_comp_data *comp_data;
int count, rc, i;
if (!fsp_present())
return OPAL_HARDWARE;
count = ARRAY_SIZE(sysparam_attrs);
for (i = 0; i < count; i++)
if (sysparam_attrs[i].id == param_id)
break;
if (i == count)
return OPAL_PARAMETER;
if (length < sysparam_attrs[i].length)
return OPAL_PARAMETER;
if (!(sysparam_attrs[i].perm & OPAL_SYSPARAM_READ))
return OPAL_PERMISSION;
comp_data = zalloc(sizeof(struct sysparam_comp_data));
if (!comp_data)
return OPAL_NO_MEM;
comp_data->param_len = sysparam_attrs[i].length;
comp_data->async_token = async_token;
rc = fsp_get_sys_param(param_id, (void *)buffer,
sysparam_attrs[i].length, fsp_opal_getparam_complete,
comp_data);
if (rc) {
free(comp_data);
prerror("%s: Error %d queuing param request\n", __func__, rc);
return OPAL_INTERNAL_ERROR;
}
return OPAL_ASYNC_COMPLETION;
}
/* OPAL interface for PowerNV to update the system parameter to FSP */
static int64_t fsp_opal_set_param(uint64_t async_token, uint32_t param_id,
uint64_t buffer, uint64_t length)
{
struct sysparam_comp_data *comp_data;
struct fsp_msg *msg;
uint64_t tce_token;
int count, rc, i;
if (!fsp_present())
return OPAL_HARDWARE;
count = ARRAY_SIZE(sysparam_attrs);
for (i = 0; i < count; i++)
if (sysparam_attrs[i].id == param_id)
break;
if (i == count)
return OPAL_PARAMETER;
if (length < sysparam_attrs[i].length)
return OPAL_PARAMETER;
if (!(sysparam_attrs[i].perm & OPAL_SYSPARAM_WRITE))
return OPAL_PERMISSION;
fsp_tce_map(PSI_DMA_SET_SYSPARAM, (void *)(buffer & ~0xffful), 0x1000);
tce_token = PSI_DMA_SET_SYSPARAM | (buffer & 0xfff);
msg = fsp_mkmsg(FSP_CMD_SET_SPARM_2, 4, param_id, length,
tce_token >> 32, tce_token);
if (!msg) {
prerror("%s: Failed to allocate the message\n", __func__);
return OPAL_INTERNAL_ERROR;
}
comp_data = zalloc(sizeof(struct sysparam_comp_data));
if (!comp_data)
return OPAL_NO_MEM;
comp_data->param_len = length;
comp_data->async_token = async_token;
msg->user_data = comp_data;
rc = fsp_queue_msg(msg, fsp_opal_setparam_complete);
if (rc) {
free(comp_data);
fsp_freemsg(msg);
prerror("%s: Failed to queue the message\n", __func__);
return OPAL_INTERNAL_ERROR;
}
return OPAL_ASYNC_COMPLETION;
}
static bool fsp_sysparam_msg(u32 cmd_sub_mod, struct fsp_msg *msg)
{
struct fsp_msg *rsp;
int rc = -ENOMEM;
switch(cmd_sub_mod) {
case FSP_CMD_SP_SPARM_UPD_0:
case FSP_CMD_SP_SPARM_UPD_1:
printf("FSP: Got sysparam update, param ID 0x%x\n",
msg->data.words[0]);
rsp = fsp_mkmsg((cmd_sub_mod & 0xffff00) | 0x008000, 0);
if (rsp)
rc = fsp_queue_msg(rsp, fsp_freemsg);
if (rc) {
prerror("FSP: Error %d queuing sysparam reply\n", rc);
/* What to do here ? R/R ? */
fsp_freemsg(rsp);
}
return true;
}
return false;
}
static struct fsp_client fsp_sysparam_client = {
.message = fsp_sysparam_msg,
};
static void add_opal_sysparam_node(void)
{
struct dt_node *sysparams;
char *names, *s;
uint32_t *ids, *lens;
uint8_t *perms;
unsigned int i, count, size = 0;
if (!fsp_present())
return;
sysparams = dt_new(opal_node, "sysparams");
dt_add_property_string(sysparams, "compatible", "ibm,opal-sysparams");
count = ARRAY_SIZE(sysparam_attrs);
for (i = 0; i < count; i++)
size = size + strlen(sysparam_attrs[i].name) + 1;
names = zalloc(size);
if (!names) {
prerror("%s: Failed to allocate memory for parameter names\n",
__func__);
return;
}
ids = zalloc(count * sizeof(*ids));
if (!ids) {
prerror("%s: Failed to allocate memory for parameter ids\n",
__func__);
goto out_free_name;
}
lens = zalloc(count * sizeof(*lens));
if (!lens) {
prerror("%s: Failed to allocate memory for parameter length\n",
__func__);
goto out_free_id;
}
perms = zalloc(count * sizeof(*perms));
if (!perms) {
prerror("%s: Failed to allocate memory for parameter length\n",
__func__);
goto out_free_len;
}
s = names;
for (i = 0; i < count; i++) {
strcpy(s, sysparam_attrs[i].name);
s = s + strlen(sysparam_attrs[i].name) + 1;
ids[i] = sysparam_attrs[i].id;
lens[i] = sysparam_attrs[i].length;
perms[i] = sysparam_attrs[i].perm;
}
dt_add_property(sysparams, "param-name", names, size);
dt_add_property(sysparams, "param-id", ids, count * sizeof(*ids));
dt_add_property(sysparams, "param-len", lens, count * sizeof(*lens));
dt_add_property(sysparams, "param-perm", perms, count * sizeof(*perms));
free(perms);
out_free_len:
free(lens);
out_free_id:
free(ids);
out_free_name:
free(names);
}
void fsp_sysparam_init(void)
{
if (!fsp_present())
return;
/* Register change notifications */
fsp_register_client(&fsp_sysparam_client, FSP_MCLASS_SERVICE);
/* Register OPAL interfaces */
opal_register(OPAL_GET_PARAM, fsp_opal_get_param, 4);
opal_register(OPAL_SET_PARAM, fsp_opal_set_param, 4);
/* Add device-tree nodes */
add_opal_sysparam_node();
}
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