WSL2-Linux-Kernel/drivers/remoteproc/qcom_q6v5_pas.c

844 строки
19 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Qualcomm ADSP/SLPI Peripheral Image Loader for MSM8974 and MSM8996
*
* Copyright (C) 2016 Linaro Ltd
* Copyright (C) 2014 Sony Mobile Communications AB
* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*/
#include <linux/clk.h>
#include <linux/firmware.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/qcom_scm.h>
#include <linux/regulator/consumer.h>
#include <linux/remoteproc.h>
#include <linux/soc/qcom/mdt_loader.h>
#include <linux/soc/qcom/smem.h>
#include <linux/soc/qcom/smem_state.h>
#include "qcom_common.h"
#include "qcom_pil_info.h"
#include "qcom_q6v5.h"
#include "remoteproc_internal.h"
struct adsp_data {
int crash_reason_smem;
const char *firmware_name;
int pas_id;
unsigned int minidump_id;
bool has_aggre2_clk;
bool auto_boot;
char **active_pd_names;
char **proxy_pd_names;
const char *ssr_name;
const char *sysmon_name;
int ssctl_id;
};
struct qcom_adsp {
struct device *dev;
struct rproc *rproc;
struct qcom_q6v5 q6v5;
struct clk *xo;
struct clk *aggre2_clk;
struct regulator *cx_supply;
struct regulator *px_supply;
struct device *active_pds[1];
struct device *proxy_pds[3];
int active_pd_count;
int proxy_pd_count;
int pas_id;
unsigned int minidump_id;
int crash_reason_smem;
bool has_aggre2_clk;
const char *info_name;
struct completion start_done;
struct completion stop_done;
phys_addr_t mem_phys;
phys_addr_t mem_reloc;
void *mem_region;
size_t mem_size;
struct qcom_rproc_glink glink_subdev;
struct qcom_rproc_subdev smd_subdev;
struct qcom_rproc_ssr ssr_subdev;
struct qcom_sysmon *sysmon;
};
static void adsp_minidump(struct rproc *rproc)
{
struct qcom_adsp *adsp = rproc->priv;
qcom_minidump(rproc, adsp->minidump_id);
}
static int adsp_pds_enable(struct qcom_adsp *adsp, struct device **pds,
size_t pd_count)
{
int ret;
int i;
for (i = 0; i < pd_count; i++) {
dev_pm_genpd_set_performance_state(pds[i], INT_MAX);
ret = pm_runtime_get_sync(pds[i]);
if (ret < 0) {
pm_runtime_put_noidle(pds[i]);
dev_pm_genpd_set_performance_state(pds[i], 0);
goto unroll_pd_votes;
}
}
return 0;
unroll_pd_votes:
for (i--; i >= 0; i--) {
dev_pm_genpd_set_performance_state(pds[i], 0);
pm_runtime_put(pds[i]);
}
return ret;
};
static void adsp_pds_disable(struct qcom_adsp *adsp, struct device **pds,
size_t pd_count)
{
int i;
for (i = 0; i < pd_count; i++) {
dev_pm_genpd_set_performance_state(pds[i], 0);
pm_runtime_put(pds[i]);
}
}
static int adsp_load(struct rproc *rproc, const struct firmware *fw)
{
struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
int ret;
ret = qcom_mdt_load(adsp->dev, fw, rproc->firmware, adsp->pas_id,
adsp->mem_region, adsp->mem_phys, adsp->mem_size,
&adsp->mem_reloc);
if (ret)
return ret;
qcom_pil_info_store(adsp->info_name, adsp->mem_phys, adsp->mem_size);
return 0;
}
static int adsp_start(struct rproc *rproc)
{
struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
int ret;
qcom_q6v5_prepare(&adsp->q6v5);
ret = adsp_pds_enable(adsp, adsp->active_pds, adsp->active_pd_count);
if (ret < 0)
goto disable_irqs;
ret = adsp_pds_enable(adsp, adsp->proxy_pds, adsp->proxy_pd_count);
if (ret < 0)
goto disable_active_pds;
ret = clk_prepare_enable(adsp->xo);
if (ret)
goto disable_proxy_pds;
ret = clk_prepare_enable(adsp->aggre2_clk);
if (ret)
goto disable_xo_clk;
ret = regulator_enable(adsp->cx_supply);
if (ret)
goto disable_aggre2_clk;
ret = regulator_enable(adsp->px_supply);
if (ret)
goto disable_cx_supply;
ret = qcom_scm_pas_auth_and_reset(adsp->pas_id);
if (ret) {
dev_err(adsp->dev,
"failed to authenticate image and release reset\n");
goto disable_px_supply;
}
ret = qcom_q6v5_wait_for_start(&adsp->q6v5, msecs_to_jiffies(5000));
if (ret == -ETIMEDOUT) {
dev_err(adsp->dev, "start timed out\n");
qcom_scm_pas_shutdown(adsp->pas_id);
goto disable_px_supply;
}
return 0;
disable_px_supply:
regulator_disable(adsp->px_supply);
disable_cx_supply:
regulator_disable(adsp->cx_supply);
disable_aggre2_clk:
clk_disable_unprepare(adsp->aggre2_clk);
disable_xo_clk:
clk_disable_unprepare(adsp->xo);
disable_proxy_pds:
adsp_pds_disable(adsp, adsp->proxy_pds, adsp->proxy_pd_count);
disable_active_pds:
adsp_pds_disable(adsp, adsp->active_pds, adsp->active_pd_count);
disable_irqs:
qcom_q6v5_unprepare(&adsp->q6v5);
return ret;
}
static void qcom_pas_handover(struct qcom_q6v5 *q6v5)
{
struct qcom_adsp *adsp = container_of(q6v5, struct qcom_adsp, q6v5);
regulator_disable(adsp->px_supply);
regulator_disable(adsp->cx_supply);
clk_disable_unprepare(adsp->aggre2_clk);
clk_disable_unprepare(adsp->xo);
adsp_pds_disable(adsp, adsp->proxy_pds, adsp->proxy_pd_count);
}
static int adsp_stop(struct rproc *rproc)
{
struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
int handover;
int ret;
ret = qcom_q6v5_request_stop(&adsp->q6v5, adsp->sysmon);
if (ret == -ETIMEDOUT)
dev_err(adsp->dev, "timed out on wait\n");
ret = qcom_scm_pas_shutdown(adsp->pas_id);
if (ret)
dev_err(adsp->dev, "failed to shutdown: %d\n", ret);
adsp_pds_disable(adsp, adsp->active_pds, adsp->active_pd_count);
handover = qcom_q6v5_unprepare(&adsp->q6v5);
if (handover)
qcom_pas_handover(&adsp->q6v5);
return ret;
}
static void *adsp_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
{
struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
int offset;
offset = da - adsp->mem_reloc;
if (offset < 0 || offset + len > adsp->mem_size)
return NULL;
return adsp->mem_region + offset;
}
static unsigned long adsp_panic(struct rproc *rproc)
{
struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
return qcom_q6v5_panic(&adsp->q6v5);
}
static const struct rproc_ops adsp_ops = {
.start = adsp_start,
.stop = adsp_stop,
.da_to_va = adsp_da_to_va,
.parse_fw = qcom_register_dump_segments,
.load = adsp_load,
.panic = adsp_panic,
};
static const struct rproc_ops adsp_minidump_ops = {
.start = adsp_start,
.stop = adsp_stop,
.da_to_va = adsp_da_to_va,
.load = adsp_load,
.panic = adsp_panic,
.coredump = adsp_minidump,
};
static int adsp_init_clock(struct qcom_adsp *adsp)
{
int ret;
adsp->xo = devm_clk_get(adsp->dev, "xo");
if (IS_ERR(adsp->xo)) {
ret = PTR_ERR(adsp->xo);
if (ret != -EPROBE_DEFER)
dev_err(adsp->dev, "failed to get xo clock");
return ret;
}
if (adsp->has_aggre2_clk) {
adsp->aggre2_clk = devm_clk_get(adsp->dev, "aggre2");
if (IS_ERR(adsp->aggre2_clk)) {
ret = PTR_ERR(adsp->aggre2_clk);
if (ret != -EPROBE_DEFER)
dev_err(adsp->dev,
"failed to get aggre2 clock");
return ret;
}
}
return 0;
}
static int adsp_init_regulator(struct qcom_adsp *adsp)
{
adsp->cx_supply = devm_regulator_get(adsp->dev, "cx");
if (IS_ERR(adsp->cx_supply))
return PTR_ERR(adsp->cx_supply);
regulator_set_load(adsp->cx_supply, 100000);
adsp->px_supply = devm_regulator_get(adsp->dev, "px");
return PTR_ERR_OR_ZERO(adsp->px_supply);
}
static int adsp_pds_attach(struct device *dev, struct device **devs,
char **pd_names)
{
size_t num_pds = 0;
int ret;
int i;
if (!pd_names)
return 0;
/* Handle single power domain */
if (dev->pm_domain) {
devs[0] = dev;
pm_runtime_enable(dev);
return 1;
}
while (pd_names[num_pds])
num_pds++;
for (i = 0; i < num_pds; i++) {
devs[i] = dev_pm_domain_attach_by_name(dev, pd_names[i]);
if (IS_ERR_OR_NULL(devs[i])) {
ret = PTR_ERR(devs[i]) ? : -ENODATA;
goto unroll_attach;
}
}
return num_pds;
unroll_attach:
for (i--; i >= 0; i--)
dev_pm_domain_detach(devs[i], false);
return ret;
};
static void adsp_pds_detach(struct qcom_adsp *adsp, struct device **pds,
size_t pd_count)
{
struct device *dev = adsp->dev;
int i;
/* Handle single power domain */
if (dev->pm_domain && pd_count) {
pm_runtime_disable(dev);
return;
}
for (i = 0; i < pd_count; i++)
dev_pm_domain_detach(pds[i], false);
}
static int adsp_alloc_memory_region(struct qcom_adsp *adsp)
{
struct device_node *node;
struct resource r;
int ret;
node = of_parse_phandle(adsp->dev->of_node, "memory-region", 0);
if (!node) {
dev_err(adsp->dev, "no memory-region specified\n");
return -EINVAL;
}
ret = of_address_to_resource(node, 0, &r);
if (ret)
return ret;
adsp->mem_phys = adsp->mem_reloc = r.start;
adsp->mem_size = resource_size(&r);
adsp->mem_region = devm_ioremap_wc(adsp->dev, adsp->mem_phys, adsp->mem_size);
if (!adsp->mem_region) {
dev_err(adsp->dev, "unable to map memory region: %pa+%zx\n",
&r.start, adsp->mem_size);
return -EBUSY;
}
return 0;
}
static int adsp_probe(struct platform_device *pdev)
{
const struct adsp_data *desc;
struct qcom_adsp *adsp;
struct rproc *rproc;
const char *fw_name;
const struct rproc_ops *ops = &adsp_ops;
int ret;
desc = of_device_get_match_data(&pdev->dev);
if (!desc)
return -EINVAL;
if (!qcom_scm_is_available())
return -EPROBE_DEFER;
fw_name = desc->firmware_name;
ret = of_property_read_string(pdev->dev.of_node, "firmware-name",
&fw_name);
if (ret < 0 && ret != -EINVAL)
return ret;
if (desc->minidump_id)
ops = &adsp_minidump_ops;
rproc = rproc_alloc(&pdev->dev, pdev->name, ops, fw_name, sizeof(*adsp));
if (!rproc) {
dev_err(&pdev->dev, "unable to allocate remoteproc\n");
return -ENOMEM;
}
rproc->auto_boot = desc->auto_boot;
rproc_coredump_set_elf_info(rproc, ELFCLASS32, EM_NONE);
adsp = (struct qcom_adsp *)rproc->priv;
adsp->dev = &pdev->dev;
adsp->rproc = rproc;
adsp->minidump_id = desc->minidump_id;
adsp->pas_id = desc->pas_id;
adsp->has_aggre2_clk = desc->has_aggre2_clk;
adsp->info_name = desc->sysmon_name;
platform_set_drvdata(pdev, adsp);
device_wakeup_enable(adsp->dev);
ret = adsp_alloc_memory_region(adsp);
if (ret)
goto free_rproc;
ret = adsp_init_clock(adsp);
if (ret)
goto free_rproc;
ret = adsp_init_regulator(adsp);
if (ret)
goto free_rproc;
ret = adsp_pds_attach(&pdev->dev, adsp->active_pds,
desc->active_pd_names);
if (ret < 0)
goto free_rproc;
adsp->active_pd_count = ret;
ret = adsp_pds_attach(&pdev->dev, adsp->proxy_pds,
desc->proxy_pd_names);
if (ret < 0)
goto detach_active_pds;
adsp->proxy_pd_count = ret;
ret = qcom_q6v5_init(&adsp->q6v5, pdev, rproc, desc->crash_reason_smem,
qcom_pas_handover);
if (ret)
goto detach_proxy_pds;
qcom_add_glink_subdev(rproc, &adsp->glink_subdev, desc->ssr_name);
qcom_add_smd_subdev(rproc, &adsp->smd_subdev);
qcom_add_ssr_subdev(rproc, &adsp->ssr_subdev, desc->ssr_name);
adsp->sysmon = qcom_add_sysmon_subdev(rproc,
desc->sysmon_name,
desc->ssctl_id);
if (IS_ERR(adsp->sysmon)) {
ret = PTR_ERR(adsp->sysmon);
goto detach_proxy_pds;
}
ret = rproc_add(rproc);
if (ret)
goto detach_proxy_pds;
return 0;
detach_proxy_pds:
adsp_pds_detach(adsp, adsp->proxy_pds, adsp->proxy_pd_count);
detach_active_pds:
adsp_pds_detach(adsp, adsp->active_pds, adsp->active_pd_count);
free_rproc:
rproc_free(rproc);
return ret;
}
static int adsp_remove(struct platform_device *pdev)
{
struct qcom_adsp *adsp = platform_get_drvdata(pdev);
rproc_del(adsp->rproc);
qcom_remove_glink_subdev(adsp->rproc, &adsp->glink_subdev);
qcom_remove_sysmon_subdev(adsp->sysmon);
qcom_remove_smd_subdev(adsp->rproc, &adsp->smd_subdev);
qcom_remove_ssr_subdev(adsp->rproc, &adsp->ssr_subdev);
rproc_free(adsp->rproc);
return 0;
}
static const struct adsp_data adsp_resource_init = {
.crash_reason_smem = 423,
.firmware_name = "adsp.mdt",
.pas_id = 1,
.has_aggre2_clk = false,
.auto_boot = true,
.ssr_name = "lpass",
.sysmon_name = "adsp",
.ssctl_id = 0x14,
};
static const struct adsp_data sm8150_adsp_resource = {
.crash_reason_smem = 423,
.firmware_name = "adsp.mdt",
.pas_id = 1,
.has_aggre2_clk = false,
.auto_boot = true,
.active_pd_names = (char*[]){
"load_state",
NULL
},
.proxy_pd_names = (char*[]){
"cx",
NULL
},
.ssr_name = "lpass",
.sysmon_name = "adsp",
.ssctl_id = 0x14,
};
static const struct adsp_data sm8250_adsp_resource = {
.crash_reason_smem = 423,
.firmware_name = "adsp.mdt",
.pas_id = 1,
.has_aggre2_clk = false,
.auto_boot = true,
.active_pd_names = (char*[]){
"load_state",
NULL
},
.proxy_pd_names = (char*[]){
"lcx",
"lmx",
NULL
},
.ssr_name = "lpass",
.sysmon_name = "adsp",
.ssctl_id = 0x14,
};
static const struct adsp_data sm8350_adsp_resource = {
.crash_reason_smem = 423,
.firmware_name = "adsp.mdt",
.pas_id = 1,
.has_aggre2_clk = false,
.auto_boot = true,
.active_pd_names = (char*[]){
"load_state",
NULL
},
.proxy_pd_names = (char*[]){
"lcx",
"lmx",
NULL
},
.ssr_name = "lpass",
.sysmon_name = "adsp",
.ssctl_id = 0x14,
};
static const struct adsp_data msm8998_adsp_resource = {
.crash_reason_smem = 423,
.firmware_name = "adsp.mdt",
.pas_id = 1,
.has_aggre2_clk = false,
.auto_boot = true,
.proxy_pd_names = (char*[]){
"cx",
NULL
},
.ssr_name = "lpass",
.sysmon_name = "adsp",
.ssctl_id = 0x14,
};
static const struct adsp_data cdsp_resource_init = {
.crash_reason_smem = 601,
.firmware_name = "cdsp.mdt",
.pas_id = 18,
.has_aggre2_clk = false,
.auto_boot = true,
.ssr_name = "cdsp",
.sysmon_name = "cdsp",
.ssctl_id = 0x17,
};
static const struct adsp_data sm8150_cdsp_resource = {
.crash_reason_smem = 601,
.firmware_name = "cdsp.mdt",
.pas_id = 18,
.has_aggre2_clk = false,
.auto_boot = true,
.active_pd_names = (char*[]){
"load_state",
NULL
},
.proxy_pd_names = (char*[]){
"cx",
NULL
},
.ssr_name = "cdsp",
.sysmon_name = "cdsp",
.ssctl_id = 0x17,
};
static const struct adsp_data sm8250_cdsp_resource = {
.crash_reason_smem = 601,
.firmware_name = "cdsp.mdt",
.pas_id = 18,
.has_aggre2_clk = false,
.auto_boot = true,
.active_pd_names = (char*[]){
"load_state",
NULL
},
.proxy_pd_names = (char*[]){
"cx",
NULL
},
.ssr_name = "cdsp",
.sysmon_name = "cdsp",
.ssctl_id = 0x17,
};
static const struct adsp_data sm8350_cdsp_resource = {
.crash_reason_smem = 601,
.firmware_name = "cdsp.mdt",
.pas_id = 18,
.has_aggre2_clk = false,
.auto_boot = true,
.active_pd_names = (char*[]){
"load_state",
NULL
},
.proxy_pd_names = (char*[]){
"cx",
NULL
},
.ssr_name = "cdsp",
.sysmon_name = "cdsp",
.ssctl_id = 0x17,
};
static const struct adsp_data mpss_resource_init = {
.crash_reason_smem = 421,
.firmware_name = "modem.mdt",
.pas_id = 4,
.minidump_id = 3,
.has_aggre2_clk = false,
.auto_boot = false,
.active_pd_names = (char*[]){
"load_state",
NULL
},
.proxy_pd_names = (char*[]){
"cx",
"mss",
NULL
},
.ssr_name = "mpss",
.sysmon_name = "modem",
.ssctl_id = 0x12,
};
static const struct adsp_data slpi_resource_init = {
.crash_reason_smem = 424,
.firmware_name = "slpi.mdt",
.pas_id = 12,
.has_aggre2_clk = true,
.auto_boot = true,
.ssr_name = "dsps",
.sysmon_name = "slpi",
.ssctl_id = 0x16,
};
static const struct adsp_data sm8150_slpi_resource = {
.crash_reason_smem = 424,
.firmware_name = "slpi.mdt",
.pas_id = 12,
.has_aggre2_clk = false,
.auto_boot = true,
.active_pd_names = (char*[]){
"load_state",
NULL
},
.proxy_pd_names = (char*[]){
"lcx",
"lmx",
NULL
},
.ssr_name = "dsps",
.sysmon_name = "slpi",
.ssctl_id = 0x16,
};
static const struct adsp_data sm8250_slpi_resource = {
.crash_reason_smem = 424,
.firmware_name = "slpi.mdt",
.pas_id = 12,
.has_aggre2_clk = false,
.auto_boot = true,
.active_pd_names = (char*[]){
"load_state",
NULL
},
.proxy_pd_names = (char*[]){
"lcx",
"lmx",
NULL
},
.ssr_name = "dsps",
.sysmon_name = "slpi",
.ssctl_id = 0x16,
};
static const struct adsp_data sm8350_slpi_resource = {
.crash_reason_smem = 424,
.firmware_name = "slpi.mdt",
.pas_id = 12,
.has_aggre2_clk = false,
.auto_boot = true,
.active_pd_names = (char*[]){
"load_state",
NULL
},
.proxy_pd_names = (char*[]){
"lcx",
"lmx",
NULL
},
.ssr_name = "dsps",
.sysmon_name = "slpi",
.ssctl_id = 0x16,
};
static const struct adsp_data msm8998_slpi_resource = {
.crash_reason_smem = 424,
.firmware_name = "slpi.mdt",
.pas_id = 12,
.has_aggre2_clk = true,
.auto_boot = true,
.proxy_pd_names = (char*[]){
"ssc_cx",
NULL
},
.ssr_name = "dsps",
.sysmon_name = "slpi",
.ssctl_id = 0x16,
};
static const struct adsp_data wcss_resource_init = {
.crash_reason_smem = 421,
.firmware_name = "wcnss.mdt",
.pas_id = 6,
.auto_boot = true,
.ssr_name = "mpss",
.sysmon_name = "wcnss",
.ssctl_id = 0x12,
};
static const struct adsp_data sdx55_mpss_resource = {
.crash_reason_smem = 421,
.firmware_name = "modem.mdt",
.pas_id = 4,
.has_aggre2_clk = false,
.auto_boot = true,
.proxy_pd_names = (char*[]){
"cx",
"mss",
NULL
},
.ssr_name = "mpss",
.sysmon_name = "modem",
.ssctl_id = 0x22,
};
static const struct of_device_id adsp_of_match[] = {
{ .compatible = "qcom,msm8974-adsp-pil", .data = &adsp_resource_init},
{ .compatible = "qcom,msm8996-adsp-pil", .data = &adsp_resource_init},
{ .compatible = "qcom,msm8996-slpi-pil", .data = &slpi_resource_init},
{ .compatible = "qcom,msm8998-adsp-pas", .data = &msm8998_adsp_resource},
{ .compatible = "qcom,msm8998-slpi-pas", .data = &msm8998_slpi_resource},
{ .compatible = "qcom,qcs404-adsp-pas", .data = &adsp_resource_init },
{ .compatible = "qcom,qcs404-cdsp-pas", .data = &cdsp_resource_init },
{ .compatible = "qcom,qcs404-wcss-pas", .data = &wcss_resource_init },
{ .compatible = "qcom,sc7180-mpss-pas", .data = &mpss_resource_init},
{ .compatible = "qcom,sdm845-adsp-pas", .data = &adsp_resource_init},
{ .compatible = "qcom,sdm845-cdsp-pas", .data = &cdsp_resource_init},
{ .compatible = "qcom,sdx55-mpss-pas", .data = &sdx55_mpss_resource},
{ .compatible = "qcom,sm8150-adsp-pas", .data = &sm8150_adsp_resource},
{ .compatible = "qcom,sm8150-cdsp-pas", .data = &sm8150_cdsp_resource},
{ .compatible = "qcom,sm8150-mpss-pas", .data = &mpss_resource_init},
{ .compatible = "qcom,sm8150-slpi-pas", .data = &sm8150_slpi_resource},
{ .compatible = "qcom,sm8250-adsp-pas", .data = &sm8250_adsp_resource},
{ .compatible = "qcom,sm8250-cdsp-pas", .data = &sm8250_cdsp_resource},
{ .compatible = "qcom,sm8250-slpi-pas", .data = &sm8250_slpi_resource},
{ .compatible = "qcom,sm8350-adsp-pas", .data = &sm8350_adsp_resource},
{ .compatible = "qcom,sm8350-cdsp-pas", .data = &sm8350_cdsp_resource},
{ .compatible = "qcom,sm8350-slpi-pas", .data = &sm8350_slpi_resource},
{ .compatible = "qcom,sm8350-mpss-pas", .data = &mpss_resource_init},
{ },
};
MODULE_DEVICE_TABLE(of, adsp_of_match);
static struct platform_driver adsp_driver = {
.probe = adsp_probe,
.remove = adsp_remove,
.driver = {
.name = "qcom_q6v5_pas",
.of_match_table = adsp_of_match,
},
};
module_platform_driver(adsp_driver);
MODULE_DESCRIPTION("Qualcomm Hexagon v5 Peripheral Authentication Service driver");
MODULE_LICENSE("GPL v2");