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/* Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*/
#define pr_fmt(fmt) "scm-pas: " fmt
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <mach/scm.h>
#include <mach/socinfo.h>
#include <mach/msm_bus.h>
#include <mach/msm_bus_board.h>
#include "scm-pas.h"
#define PAS_INIT_IMAGE_CMD 1
#define PAS_AUTH_AND_RESET_CMD 5
#define PAS_SHUTDOWN_CMD 6
#define PAS_IS_SUPPORTED_CMD 7
int pas_init_image(enum pas_id id, const u8 *metadata, size_t size)
{
int ret;
struct pas_init_image_req {
u32 proc;
u32 image_addr;
} request;
u32 scm_ret = 0;
void *mdata_buf;
dma_addr_t mdata_phys;
DEFINE_DMA_ATTRS(attrs);
dma_set_attr(DMA_ATTR_STRONGLY_ORDERED, &attrs);
mdata_buf = dma_alloc_attrs(NULL, size, &mdata_phys, GFP_KERNEL,
&attrs);
if (!mdata_buf) {
pr_err("Allocation for metadata failed.\n");
return -ENOMEM;
}
memcpy(mdata_buf, metadata, size);
request.proc = id;
request.image_addr = mdata_phys;
ret = scm_call(SCM_SVC_PIL, PAS_INIT_IMAGE_CMD, &request,
sizeof(request), &scm_ret, sizeof(scm_ret));
dma_free_attrs(NULL, size, mdata_buf, mdata_phys, &attrs);
if (ret)
return ret;
return scm_ret;
}
EXPORT_SYMBOL(pas_init_image);
static struct msm_bus_paths scm_pas_bw_tbl[] = {
{
.vectors = (struct msm_bus_vectors[]){
{
.src = MSM_BUS_MASTER_SPS,
.dst = MSM_BUS_SLAVE_EBI_CH0,
},
},
.num_paths = 1,
},
{
.vectors = (struct msm_bus_vectors[]){
{
.src = MSM_BUS_MASTER_SPS,
.dst = MSM_BUS_SLAVE_EBI_CH0,
.ib = 492 * 8 * 1000000UL,
.ab = 492 * 8 * 100000UL,
},
},
.num_paths = 1,
},
};
static struct msm_bus_scale_pdata scm_pas_bus_pdata = {
.usecase = scm_pas_bw_tbl,
.num_usecases = ARRAY_SIZE(scm_pas_bw_tbl),
.name = "scm_pas",
};
static uint32_t scm_perf_client;
static struct clk *scm_bus_clk;
static DEFINE_MUTEX(scm_pas_bw_mutex);
static int scm_pas_bw_count;
static int scm_pas_enable_bw(void)
{
int ret = 0;
if (!scm_perf_client)
return -EINVAL;
mutex_lock(&scm_pas_bw_mutex);
if (!scm_pas_bw_count) {
ret = msm_bus_scale_client_update_request(scm_perf_client, 1);
if (ret) {
pr_err("bandwidth request failed (%d)\n", ret);
} else if (scm_bus_clk) {
ret = clk_prepare_enable(scm_bus_clk);
if (ret)
pr_err("clock enable failed\n");
}
}
if (ret)
msm_bus_scale_client_update_request(scm_perf_client, 0);
else
scm_pas_bw_count++;
mutex_unlock(&scm_pas_bw_mutex);
return ret;
}
static void scm_pas_disable_bw(void)
{
mutex_lock(&scm_pas_bw_mutex);
if (scm_pas_bw_count-- == 1) {
msm_bus_scale_client_update_request(scm_perf_client, 0);
if (scm_bus_clk)
clk_disable_unprepare(scm_bus_clk);
}
mutex_unlock(&scm_pas_bw_mutex);
}
int pas_auth_and_reset(enum pas_id id)
{
int ret, bus_ret;
u32 proc = id, scm_ret = 0;
bus_ret = scm_pas_enable_bw();
ret = scm_call(SCM_SVC_PIL, PAS_AUTH_AND_RESET_CMD, &proc,
sizeof(proc), &scm_ret, sizeof(scm_ret));
if (ret)
scm_ret = ret;
if (!bus_ret)
scm_pas_disable_bw();
return scm_ret;
}
EXPORT_SYMBOL(pas_auth_and_reset);
int pas_shutdown(enum pas_id id)
{
int ret;
u32 proc = id, scm_ret = 0;
ret = scm_call(SCM_SVC_PIL, PAS_SHUTDOWN_CMD, &proc, sizeof(proc),
&scm_ret, sizeof(scm_ret));
if (ret)
return ret;
return scm_ret;
}
EXPORT_SYMBOL(pas_shutdown);
static bool secure_pil = true;
module_param(secure_pil, bool, S_IRUGO);
MODULE_PARM_DESC(secure_pil, "Use secure PIL");
int pas_supported(enum pas_id id)
{
int ret;
u32 periph = id, ret_val = 0;
if (!secure_pil)
return 0;
/*
* 8660 SCM doesn't support querying secure PIL support so just return
* true if not overridden on the command line.
*/
if (cpu_is_msm8x60())
return 1;
if (scm_is_call_available(SCM_SVC_PIL, PAS_IS_SUPPORTED_CMD) <= 0)
return 0;
ret = scm_call(SCM_SVC_PIL, PAS_IS_SUPPORTED_CMD, &periph,
sizeof(periph), &ret_val, sizeof(ret_val));
if (ret)
return ret;
return ret_val;
}
EXPORT_SYMBOL(pas_supported);
static int __init scm_pas_init(void)
{
if (cpu_is_msm8974()) {
scm_pas_bw_tbl[0].vectors[0].src = MSM_BUS_MASTER_CRYPTO_CORE0;
scm_pas_bw_tbl[1].vectors[0].src = MSM_BUS_MASTER_CRYPTO_CORE0;
} else {
scm_bus_clk = clk_get_sys("scm", "bus_clk");
if (!IS_ERR(scm_bus_clk)) {
clk_set_rate(scm_bus_clk, 64000000);
} else {
scm_bus_clk = NULL;
pr_warn("unable to get bus clock\n");
}
}
scm_perf_client = msm_bus_scale_register_client(&scm_pas_bus_pdata);
if (!scm_perf_client)
pr_warn("unable to register bus client\n");
return 0;
}
module_init(scm_pas_init);
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