blob: ef13c346bf3b0fc4da96fdf3128e21cfea4de22c [file] [log] [blame]
/*
* Copyright (c) 2012-2013, 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.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/clk.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/sysfs.h>
#include <mach/clk.h>
#include <mach/subsystem_restart.h>
#include <mach/subsystem_notif.h>
#include <mach/scm.h>
#include "peripheral-loader.h"
#include "pil-q6v5.h"
#include "scm-pas.h"
#include "ramdump.h"
#include "sysmon.h"
#define QDSP6SS_RST_EVB 0x010
#define PROXY_TIMEOUT_MS 10000
static struct kobject *lpass_status;
static char status[32];
struct lpass_data {
struct q6v5_data *q6;
struct subsys_device *subsys;
struct subsys_desc subsys_desc;
void *ramdump_dev;
int wdog_irq;
struct work_struct work;
void *riva_notif_hdle;
void *modem_notif_hdle;
int crash_shutdown;
};
#define subsys_to_drv(d) container_of(d, struct lpass_data, subsys_desc)
static int pil_lpass_enable_clks(struct q6v5_data *drv)
{
int ret;
ret = clk_reset(drv->core_clk, CLK_RESET_DEASSERT);
if (ret)
goto err_reset;
ret = clk_prepare_enable(drv->core_clk);
if (ret)
goto err_core_clk;
ret = clk_prepare_enable(drv->ahb_clk);
if (ret)
goto err_ahb_clk;
ret = clk_prepare_enable(drv->axi_clk);
if (ret)
goto err_axi_clk;
ret = clk_prepare_enable(drv->reg_clk);
if (ret)
goto err_reg_clk;
return 0;
err_reg_clk:
clk_disable_unprepare(drv->axi_clk);
err_axi_clk:
clk_disable_unprepare(drv->ahb_clk);
err_ahb_clk:
clk_disable_unprepare(drv->core_clk);
err_core_clk:
clk_reset(drv->core_clk, CLK_RESET_ASSERT);
err_reset:
return ret;
}
static void pil_lpass_disable_clks(struct q6v5_data *drv)
{
clk_disable_unprepare(drv->reg_clk);
clk_disable_unprepare(drv->axi_clk);
clk_disable_unprepare(drv->ahb_clk);
clk_disable_unprepare(drv->core_clk);
clk_reset(drv->core_clk, CLK_RESET_ASSERT);
}
static int pil_lpass_shutdown(struct pil_desc *pil)
{
struct q6v5_data *drv = container_of(pil, struct q6v5_data, desc);
pil_q6v5_halt_axi_port(pil, drv->axi_halt_base);
/*
* If the shutdown function is called before the reset function, clocks
* will not be enabled yet. Enable them here so that register writes
* performed during the shutdown succeed.
*/
if (drv->is_booted == false)
pil_lpass_enable_clks(drv);
pil_q6v5_shutdown(pil);
pil_lpass_disable_clks(drv);
writel_relaxed(1, drv->restart_reg);
drv->is_booted = false;
return 0;
}
static int pil_lpass_reset(struct pil_desc *pil)
{
struct q6v5_data *drv = container_of(pil, struct q6v5_data, desc);
unsigned long start_addr = pil_get_entry_addr(pil);
int ret;
/* Deassert reset to subsystem and wait for propagation */
writel_relaxed(0, drv->restart_reg);
mb();
udelay(2);
ret = pil_lpass_enable_clks(drv);
if (ret)
return ret;
/* Program Image Address */
writel_relaxed((start_addr >> 4) & 0x0FFFFFF0,
drv->reg_base + QDSP6SS_RST_EVB);
ret = pil_q6v5_reset(pil);
if (ret) {
pil_lpass_disable_clks(drv);
return ret;
}
drv->is_booted = true;
return 0;
}
static struct pil_reset_ops pil_lpass_ops = {
.proxy_vote = pil_q6v5_make_proxy_votes,
.proxy_unvote = pil_q6v5_remove_proxy_votes,
.auth_and_reset = pil_lpass_reset,
.shutdown = pil_lpass_shutdown,
};
static int pil_lpass_init_image_trusted(struct pil_desc *pil,
const u8 *metadata, size_t size)
{
return pas_init_image(PAS_Q6, metadata, size);
}
static int pil_lpass_mem_setup_trusted(struct pil_desc *pil, phys_addr_t addr,
size_t size)
{
return pas_mem_setup(PAS_Q6, addr, size);
}
static int pil_lpass_reset_trusted(struct pil_desc *pil)
{
return pas_auth_and_reset(PAS_Q6);
}
static int pil_lpass_shutdown_trusted(struct pil_desc *pil)
{
return pas_shutdown(PAS_Q6);
}
static struct pil_reset_ops pil_lpass_ops_trusted = {
.init_image = pil_lpass_init_image_trusted,
.mem_setup = pil_lpass_mem_setup_trusted,
.proxy_vote = pil_q6v5_make_proxy_votes,
.proxy_unvote = pil_q6v5_remove_proxy_votes,
.auth_and_reset = pil_lpass_reset_trusted,
.shutdown = pil_lpass_shutdown_trusted,
};
static int riva_notifier_cb(struct notifier_block *this, unsigned long code,
void *ss_handle)
{
int ret;
switch (code) {
case SUBSYS_BEFORE_SHUTDOWN:
pr_debug("%s: R-Notify: Shutdown started\n", __func__);
ret = sysmon_send_event(SYSMON_SS_LPASS, "wcnss",
SUBSYS_BEFORE_SHUTDOWN);
if (ret < 0)
pr_err("%s: sysmon_send_event error %d", __func__, ret);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block rnb = {
.notifier_call = riva_notifier_cb,
};
static int modem_notifier_cb(struct notifier_block *this, unsigned long code,
void *ss_handle)
{
int ret;
pr_debug("%s: M-Notify: event %lu\n", __func__, code);
ret = sysmon_send_event(SYSMON_SS_LPASS, "modem", code);
if (ret < 0)
pr_err("%s: sysmon_send_event error %d", __func__, ret);
return NOTIFY_DONE;
}
static struct notifier_block mnb = {
.notifier_call = modem_notifier_cb,
};
static void adsp_log_failure_reason(void)
{
char *reason;
char buffer[81];
unsigned size;
reason = smem_get_entry(SMEM_SSR_REASON_LPASS0, &size);
if (!reason) {
pr_err("ADSP subsystem failure reason: (unknown, smem_get_entry failed).");
return;
}
if (reason[0] == '\0') {
pr_err("ADSP subsystem failure reason: (unknown, init value found)");
return;
}
size = min(size, sizeof(buffer) - 1);
memcpy(buffer, reason, size);
buffer[size] = '\0';
pr_err("ADSP subsystem failure reason: %s", buffer);
memset((void *)reason, 0x0, size);
wmb();
}
static void restart_adsp(struct lpass_data *drv)
{
adsp_log_failure_reason();
subsystem_restart_dev(drv->subsys);
}
static void adsp_fatal_fn(struct work_struct *work)
{
struct lpass_data *drv = container_of(work, struct lpass_data, work);
pr_err("Watchdog bite received from ADSP!\n");
restart_adsp(drv);
}
static void adsp_smsm_state_cb(void *data, uint32_t old_state,
uint32_t new_state)
{
struct lpass_data *drv = data;
/* Ignore if we're the one that set SMSM_RESET */
if (drv->crash_shutdown)
return;
if (new_state & SMSM_RESET) {
pr_err("%s: ADSP SMSM state changed to SMSM_RESET, new_state = %#x, old_state = %#x\n",
__func__, new_state, old_state);
restart_adsp(drv);
}
}
#define SCM_Q6_NMI_CMD 0x1
static void send_q6_nmi(void)
{
/* Send NMI to QDSP6 via an SCM call. */
scm_call_atomic1(SCM_SVC_UTIL, SCM_Q6_NMI_CMD, 0x1);
pr_debug("%s: Q6 NMI was sent.\n", __func__);
}
/*
* The "status" file where a static variable is read from and written to.
*/
static ssize_t adsp_state_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
return snprintf(buf, sizeof(status), "%s\n", status);
}
static struct kobj_attribute adsp_state_attribute =
__ATTR(status, 0444, adsp_state_show, NULL);
static struct attribute *attrs[] = {
&adsp_state_attribute.attr,
NULL, /* need to NULL terminate the list of attributes */
};
static struct attribute_group attr_group = {
.attrs = attrs,
};
static void adsp_set_state(char *state)
{
strlcpy(status, state, sizeof(status));
sysfs_notify(lpass_status, NULL, "status");
}
#define subsys_to_lpass(d) container_of(d, struct lpass_data, subsys_desc)
static int adsp_shutdown(const struct subsys_desc *subsys)
{
struct lpass_data *drv = subsys_to_lpass(subsys);
send_q6_nmi();
/* The write needs to go through before the q6 is shutdown. */
mb();
pil_shutdown(&drv->q6->desc);
disable_irq_nosync(drv->wdog_irq);
pr_debug("ADSP is Down\n");
adsp_set_state("OFFLINE");
return 0;
}
static int adsp_powerup(const struct subsys_desc *subsys)
{
struct lpass_data *drv = subsys_to_lpass(subsys);
int ret = 0;
ret = pil_boot(&drv->q6->desc);
enable_irq(drv->wdog_irq);
pr_debug("ADSP is back online\n");
adsp_set_state("ONLINE");
return ret;
}
static int adsp_ramdump(int enable, const struct subsys_desc *subsys)
{
struct lpass_data *drv = subsys_to_lpass(subsys);
if (!enable)
return 0;
return pil_do_ramdump(&drv->q6->desc, drv->ramdump_dev);
}
static void adsp_crash_shutdown(const struct subsys_desc *subsys)
{
struct lpass_data *drv = subsys_to_lpass(subsys);
drv->crash_shutdown = 1;
send_q6_nmi();
}
static irqreturn_t adsp_wdog_bite_irq(int irq, void *dev_id)
{
struct lpass_data *drv = dev_id;
disable_irq_nosync(drv->wdog_irq);
schedule_work(&drv->work);
return IRQ_HANDLED;
}
static int lpass_start(const struct subsys_desc *desc)
{
struct lpass_data *drv = subsys_to_drv(desc);
return pil_boot(&drv->q6->desc);
}
static void lpass_stop(const struct subsys_desc *desc)
{
struct lpass_data *drv = subsys_to_drv(desc);
pil_shutdown(&drv->q6->desc);
}
static int __devinit pil_lpass_driver_probe(struct platform_device *pdev)
{
struct lpass_data *drv;
struct q6v5_data *q6;
struct pil_desc *desc;
struct resource *res;
int ret;
drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
if (!drv)
return -ENOMEM;
platform_set_drvdata(pdev, drv);
drv->wdog_irq = platform_get_irq(pdev, 0);
if (drv->wdog_irq < 0)
return drv->wdog_irq;
q6 = pil_q6v5_init(pdev);
if (IS_ERR(q6))
return PTR_ERR(q6);
drv->q6 = q6;
desc = &q6->desc;
desc->owner = THIS_MODULE;
desc->proxy_timeout = PROXY_TIMEOUT_MS;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "restart_reg");
q6->restart_reg = devm_request_and_ioremap(&pdev->dev, res);
if (!q6->restart_reg)
return -ENOMEM;
q6->core_clk = devm_clk_get(&pdev->dev, "core_clk");
if (IS_ERR(q6->core_clk))
return PTR_ERR(q6->core_clk);
q6->ahb_clk = devm_clk_get(&pdev->dev, "iface_clk");
if (IS_ERR(q6->ahb_clk))
return PTR_ERR(q6->ahb_clk);
q6->axi_clk = devm_clk_get(&pdev->dev, "bus_clk");
if (IS_ERR(q6->axi_clk))
return PTR_ERR(q6->axi_clk);
q6->reg_clk = devm_clk_get(&pdev->dev, "reg_clk");
if (IS_ERR(q6->reg_clk))
return PTR_ERR(q6->reg_clk);
if (pas_supported(PAS_Q6) > 0) {
desc->ops = &pil_lpass_ops_trusted;
dev_info(&pdev->dev, "using secure boot\n");
} else {
desc->ops = &pil_lpass_ops;
dev_info(&pdev->dev, "using non-secure boot\n");
}
ret = pil_desc_init(desc);
if (ret)
return ret;
drv->subsys_desc.name = desc->name;
drv->subsys_desc.owner = THIS_MODULE;
drv->subsys_desc.dev = &pdev->dev;
drv->subsys_desc.shutdown = adsp_shutdown;
drv->subsys_desc.powerup = adsp_powerup;
drv->subsys_desc.ramdump = adsp_ramdump;
drv->subsys_desc.crash_shutdown = adsp_crash_shutdown;
drv->subsys_desc.start = lpass_start;
drv->subsys_desc.stop = lpass_stop;
INIT_WORK(&drv->work, adsp_fatal_fn);
drv->ramdump_dev = create_ramdump_device("adsp", &pdev->dev);
if (!drv->ramdump_dev) {
ret = -ENOMEM;
goto err_ramdump;
}
drv->subsys = subsys_register(&drv->subsys_desc);
if (IS_ERR(drv->subsys)) {
ret = PTR_ERR(drv->subsys);
goto err_subsys;
}
ret = devm_request_irq(&pdev->dev, drv->wdog_irq, adsp_wdog_bite_irq,
IRQF_TRIGGER_RISING, dev_name(&pdev->dev), drv);
if (ret)
goto err_irq;
ret = smsm_state_cb_register(SMSM_Q6_STATE, SMSM_RESET,
adsp_smsm_state_cb, drv);
if (ret < 0)
goto err_smsm;
drv->riva_notif_hdle = subsys_notif_register_notifier("riva", &rnb);
if (IS_ERR(drv->riva_notif_hdle)) {
ret = PTR_ERR(drv->riva_notif_hdle);
goto err_notif_riva;
}
drv->modem_notif_hdle = subsys_notif_register_notifier("modem", &mnb);
if (IS_ERR(drv->modem_notif_hdle)) {
ret = PTR_ERR(drv->modem_notif_hdle);
goto err_notif_modem;
}
lpass_status = kobject_create_and_add("audio_voice_service",
kernel_kobj);
if (!lpass_status) {
pr_err("%s: kobject create failed\n", __func__);
ret = -ENOMEM;
goto err_notif_modem;
}
ret = sysfs_create_group(lpass_status, &attr_group);
if (ret) {
pr_err("%s: sysfs create group failed\n", __func__);
goto err_kobj;
}
adsp_set_state("ONLINE");
return 0;
err_kobj:
kobject_put(lpass_status);
err_notif_modem:
subsys_notif_unregister_notifier(drv->riva_notif_hdle, &rnb);
err_notif_riva:
smsm_state_cb_deregister(SMSM_Q6_STATE, SMSM_RESET,
adsp_smsm_state_cb, drv);
err_smsm:
err_irq:
subsys_unregister(drv->subsys);
err_subsys:
destroy_ramdump_device(drv->ramdump_dev);
err_ramdump:
pil_desc_release(desc);
return ret;
}
static int __devexit pil_lpass_driver_exit(struct platform_device *pdev)
{
struct lpass_data *drv = platform_get_drvdata(pdev);
subsys_notif_unregister_notifier(drv->riva_notif_hdle, &rnb);
subsys_notif_unregister_notifier(drv->modem_notif_hdle, &mnb);
smsm_state_cb_deregister(SMSM_Q6_STATE, SMSM_RESET,
adsp_smsm_state_cb, drv);
subsys_unregister(drv->subsys);
destroy_ramdump_device(drv->ramdump_dev);
pil_desc_release(&drv->q6->desc);
sysfs_remove_group(lpass_status, &attr_group);
kobject_del(lpass_status);
return 0;
}
static struct of_device_id lpass_match_table[] = {
{ .compatible = "qcom,pil-q6v5-lpass" },
{}
};
static struct platform_driver pil_lpass_driver = {
.probe = pil_lpass_driver_probe,
.remove = __devexit_p(pil_lpass_driver_exit),
.driver = {
.name = "pil-q6v5-lpass",
.of_match_table = lpass_match_table,
.owner = THIS_MODULE,
},
};
static int __init pil_lpass_init(void)
{
return platform_driver_register(&pil_lpass_driver);
}
module_init(pil_lpass_init);
static void __exit pil_lpass_exit(void)
{
platform_driver_unregister(&pil_lpass_driver);
}
module_exit(pil_lpass_exit);
MODULE_DESCRIPTION("Support for booting low-power audio subsystems with QDSP6v5 (Hexagon) processors");
MODULE_LICENSE("GPL v2");