blob: 0630e6a3ca9e034a33b10a580bcc00d289c7a96b [file] [log] [blame]
/* Copyright (c) 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.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/atomic.h>
#include <linux/interrupt.h>
#include <mach/subsystem_restart.h>
#include <mach/msm_smsm.h>
#include "peripheral-loader.h"
#include "scm-pas.h"
#include "ramdump.h"
#define PPSS_RESET 0x2594
#define PPSS_RESET_PROC_RESET 0x2
#define PPSS_RESET_RESET 0x1
#define PPSS_PROC_CLK_CTL 0x2588
#define CLK_BRANCH_ENA 0x10
#define PPSS_HCLK_CTL 0x2580
#define CLK_HALT_DFAB_STATE 0x2FC8
#define PPSS_WDOG_UNMASKED_INT_EN 0x1808
struct dsps_data {
void __iomem *base;
struct pil_desc desc;
struct subsys_device *subsys;
struct subsys_desc subsys_desc;
int crash;
int wdog_irq;
atomic_t wd_crash;
atomic_t crash_in_progress;
void __iomem *ppss_base;
void *ramdump_dev;
void *smem_ramdump_dev;
struct ramdump_segment smem_ramdump_segments[1];
};
#define desc_to_drv(d) container_of(d, struct dsps_data, subsys_desc)
#define pil_to_drv(d) container_of(d, struct dsps_data, desc)
static int init_image_dsps(struct pil_desc *pil, const u8 *metadata,
size_t size)
{
struct dsps_data *drv = pil_to_drv(pil);
/* Bring memory and bus interface out of reset */
writel_relaxed(PPSS_RESET_PROC_RESET, drv->base + PPSS_RESET);
writel_relaxed(CLK_BRANCH_ENA, drv->base + PPSS_HCLK_CTL);
mb();
return 0;
}
static int reset_dsps(struct pil_desc *pil)
{
struct dsps_data *drv = pil_to_drv(pil);
writel_relaxed(CLK_BRANCH_ENA, drv->base + PPSS_PROC_CLK_CTL);
while (readl_relaxed(drv->base + CLK_HALT_DFAB_STATE) & BIT(18))
cpu_relax();
/* Bring DSPS out of reset */
writel_relaxed(0x0, drv->base + PPSS_RESET);
return 0;
}
static int shutdown_dsps(struct pil_desc *pil)
{
struct dsps_data *drv = pil_to_drv(pil);
writel_relaxed(PPSS_RESET_PROC_RESET | PPSS_RESET_RESET,
drv->base + PPSS_RESET);
usleep_range(1000, 2000);
writel_relaxed(PPSS_RESET_PROC_RESET, drv->base + PPSS_RESET);
writel_relaxed(0x0, drv->base + PPSS_PROC_CLK_CTL);
return 0;
}
struct pil_reset_ops pil_dsps_ops = {
.init_image = init_image_dsps,
.auth_and_reset = reset_dsps,
.shutdown = shutdown_dsps,
};
static int init_image_dsps_trusted(struct pil_desc *pil, const u8 *metadata,
size_t size)
{
return pas_init_image(PAS_DSPS, metadata, size);
}
static int reset_dsps_trusted(struct pil_desc *pil)
{
return pas_auth_and_reset(PAS_DSPS);
}
static int shutdown_dsps_trusted(struct pil_desc *pil)
{
return pas_shutdown(PAS_DSPS);
}
struct pil_reset_ops pil_dsps_ops_trusted = {
.init_image = init_image_dsps_trusted,
.auth_and_reset = reset_dsps_trusted,
.shutdown = shutdown_dsps_trusted,
};
static void dsps_log_sfr(void)
{
const char dflt_reason[] = "Died too early due to unknown reason";
char *smem_reset_reason;
unsigned smem_reset_size;
smem_reset_reason = smem_get_entry(SMEM_SSR_REASON_DSPS0,
&smem_reset_size);
if (smem_reset_reason != NULL && smem_reset_reason[0] != 0) {
smem_reset_reason[smem_reset_size-1] = 0;
pr_err("%s: DSPS failure: %s\nResetting DSPS\n",
__func__, smem_reset_reason);
memset(smem_reset_reason, 0, smem_reset_size);
wmb();
} else
pr_err("%s: DSPS failure: %s\nResetting DSPS\n",
__func__, dflt_reason);
}
static void dsps_restart_handler(struct dsps_data *drv)
{
pr_debug("%s: Restart lvl %d\n",
__func__, get_restart_level());
if (atomic_add_return(1, &drv->crash_in_progress) > 1) {
pr_err("%s: DSPS already resetting. Count %d\n", __func__,
atomic_read(&drv->crash_in_progress));
} else {
subsystem_restart_dev(drv->subsys);
}
}
static void dsps_smsm_state_cb(void *data, uint32_t old_state,
uint32_t new_state)
{
struct dsps_data *drv = data;
if (drv->crash == 1) {
pr_debug("SMSM_RESET state change ignored\n");
drv->crash = 0;
} else if (new_state & SMSM_RESET) {
dsps_log_sfr();
dsps_restart_handler(drv);
}
}
static int dsps_start(const struct subsys_desc *desc)
{
struct dsps_data *drv = desc_to_drv(desc);
return pil_boot(&drv->desc);
}
static void dsps_stop(const struct subsys_desc *desc)
{
struct dsps_data *drv = desc_to_drv(desc);
pil_shutdown(&drv->desc);
}
static int dsps_shutdown(const struct subsys_desc *desc)
{
struct dsps_data *drv = desc_to_drv(desc);
disable_irq_nosync(drv->wdog_irq);
if (drv->ppss_base) {
writel_relaxed(0, drv->ppss_base + PPSS_WDOG_UNMASKED_INT_EN);
mb(); /* Make sure wdog is disabled before shutting down */
}
pil_shutdown(&drv->desc);
return 0;
}
static int dsps_powerup(const struct subsys_desc *desc)
{
struct dsps_data *drv = desc_to_drv(desc);
pil_boot(&drv->desc);
atomic_set(&drv->crash_in_progress, 0);
enable_irq(drv->wdog_irq);
return 0;
}
static int dsps_ramdump(int enable, const struct subsys_desc *desc)
{
int ret;
struct dsps_data *drv = desc_to_drv(desc);
if (!enable)
return 0;
ret = pil_do_ramdump(&drv->desc, drv->ramdump_dev);
if (ret < 0) {
pr_err("%s: Unable to dump DSPS memory (rc = %d).\n",
__func__, ret);
return ret;
}
ret = do_elf_ramdump(drv->smem_ramdump_dev, drv->smem_ramdump_segments,
ARRAY_SIZE(drv->smem_ramdump_segments));
if (ret < 0) {
pr_err("%s: Unable to dump smem memory (rc = %d).\n",
__func__, ret);
return ret;
}
return 0;
}
static void dsps_crash_shutdown(const struct subsys_desc *desc)
{
struct dsps_data *drv = desc_to_drv(desc);
disable_irq_nosync(drv->wdog_irq);
drv->crash = 1;
smsm_change_state(SMSM_DSPS_STATE, SMSM_RESET, SMSM_RESET);
}
static irqreturn_t dsps_wdog_bite_irq(int irq, void *dev_id)
{
struct dsps_data *drv = dev_id;
atomic_set(&drv->wd_crash, 1);
dsps_log_sfr();
dsps_restart_handler(drv);
return IRQ_HANDLED;
}
static int __devinit pil_dsps_driver_probe(struct platform_device *pdev)
{
struct dsps_data *drv;
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);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
drv->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!drv->base)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (res) {
drv->ppss_base = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!drv->ppss_base)
return -ENOMEM;
}
desc = &drv->desc;
desc->name = pdev->dev.platform_data;
desc->dev = &pdev->dev;
desc->owner = THIS_MODULE;
desc->flags = PIL_SKIP_ENTRY_CHECK;
if (pas_supported(PAS_DSPS) > 0) {
desc->ops = &pil_dsps_ops_trusted;
dev_info(&pdev->dev, "using secure boot\n");
} else {
desc->ops = &pil_dsps_ops;
dev_info(&pdev->dev, "using non-secure boot\n");
}
ret = pil_desc_init(desc);
if (ret)
return ret;
drv->ramdump_dev = create_ramdump_device("dsps", &pdev->dev);
if (!drv->ramdump_dev) {
ret = -ENOMEM;
goto err_ramdump;
}
drv->smem_ramdump_segments[0].address = PHYS_OFFSET - SZ_2M;
drv->smem_ramdump_segments[0].size = SZ_2M;
drv->smem_ramdump_dev = create_ramdump_device("smem-dsps", &pdev->dev);
if (!drv->smem_ramdump_dev) {
ret = -ENOMEM;
goto err_smem_ramdump;
}
drv->subsys_desc.name = "dsps";
drv->subsys_desc.dev = &pdev->dev;
drv->subsys_desc.owner = THIS_MODULE;
drv->subsys_desc.start = dsps_start;
drv->subsys_desc.stop = dsps_stop;
drv->subsys_desc.shutdown = dsps_shutdown;
drv->subsys_desc.powerup = dsps_powerup;
drv->subsys_desc.ramdump = dsps_ramdump,
drv->subsys_desc.crash_shutdown = dsps_crash_shutdown;
drv->subsys = subsys_register(&drv->subsys_desc);
if (IS_ERR(drv->subsys)) {
ret = PTR_ERR(drv->subsys);
goto err_subsys;
}
ret = smsm_state_cb_register(SMSM_DSPS_STATE, SMSM_RESET,
dsps_smsm_state_cb, drv);
if (ret)
goto err_smsm;
drv->wdog_irq = platform_get_irq(pdev, 0);
if (drv->wdog_irq >= 0) {
ret = devm_request_irq(&pdev->dev, drv->wdog_irq,
dsps_wdog_bite_irq, IRQF_TRIGGER_RISING,
"dsps_wdog", drv);
if (ret) {
dev_err(&pdev->dev, "request_irq failed\n");
goto err_smsm;
}
} else {
drv->wdog_irq = -1;
dev_dbg(&pdev->dev, "ppss_wdog not supported\n");
}
return 0;
err_smsm:
subsys_unregister(drv->subsys);
err_subsys:
destroy_ramdump_device(drv->smem_ramdump_dev);
err_smem_ramdump:
destroy_ramdump_device(drv->ramdump_dev);
err_ramdump:
pil_desc_release(desc);
return ret;
}
static int __devexit pil_dsps_driver_exit(struct platform_device *pdev)
{
struct dsps_data *drv = platform_get_drvdata(pdev);
smsm_state_cb_deregister(SMSM_DSPS_STATE, SMSM_RESET,
dsps_smsm_state_cb, drv);
subsys_unregister(drv->subsys);
destroy_ramdump_device(drv->smem_ramdump_dev);
destroy_ramdump_device(drv->ramdump_dev);
pil_desc_release(&drv->desc);
return 0;
}
static struct platform_driver pil_dsps_driver = {
.probe = pil_dsps_driver_probe,
.remove = __devexit_p(pil_dsps_driver_exit),
.driver = {
.name = "pil_dsps",
.owner = THIS_MODULE,
},
};
static int __init pil_dsps_init(void)
{
return platform_driver_register(&pil_dsps_driver);
}
module_init(pil_dsps_init);
static void __exit pil_dsps_exit(void)
{
platform_driver_unregister(&pil_dsps_driver);
}
module_exit(pil_dsps_exit);
MODULE_DESCRIPTION("Support for booting sensors (DSPS) images");
MODULE_LICENSE("GPL v2");