blob: 83982068bcdb84e53c1af894833be7e3758c9a9c [file] [log] [blame]
/* Copyright (c) 2010-2013, 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/ioport.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <mach/subsystem_restart.h>
#include <mach/msm_smsm.h>
#include <mach/ramdump.h>
#include "modem_notifier.h"
#include "peripheral-loader.h"
#include "scm-pas.h"
#define MARM_BOOT_CONTROL 0x0010
#define MARM_RESET 0x2BD4
#define MAHB0_SFAB_PORT_RESET 0x2304
#define MARM_CLK_BRANCH_ENA_VOTE 0x3000
#define MARM_CLK_SRC0_NS 0x2BC0
#define MARM_CLK_SRC1_NS 0x2BC4
#define MARM_CLK_SRC_CTL 0x2BC8
#define MARM_CLK_CTL 0x2BCC
#define SFAB_MSS_S_HCLK_CTL 0x2C00
#define MSS_MODEM_CXO_CLK_CTL 0x2C44
#define MSS_SLP_CLK_CTL 0x2C60
#define MSS_MARM_SYS_REF_CLK_CTL 0x2C64
#define MAHB0_CLK_CTL 0x2300
#define MAHB1_CLK_CTL 0x2BE4
#define MAHB2_CLK_CTL 0x2C20
#define MAHB1_NS 0x2BE0
#define MARM_CLK_FS 0x2BD0
#define MAHB2_CLK_FS 0x2C24
#define PLL_ENA_MARM 0x3500
#define PLL8_STATUS 0x3158
#define CLK_HALT_MSS_SMPSS_MISC_STATE 0x2FDC
#define MSS_MODEM_RESET 0x2C48
struct modem_data {
void __iomem *base;
void __iomem *wdog;
void __iomem *cbase;
struct pil_device *pil;
struct clk *xo;
struct notifier_block notifier;
int ignore_smsm_ack;
int irq;
struct pil_desc pil_desc;
struct subsys_device *subsys;
struct subsys_desc subsys_desc;
struct delayed_work unlock_work;
struct work_struct fatal_work;
struct ramdump_device *ramdump_dev;
};
static int make_modem_proxy_votes(struct pil_desc *pil)
{
int ret;
struct modem_data *drv = dev_get_drvdata(pil->dev);
ret = clk_prepare_enable(drv->xo);
if (ret) {
dev_err(pil->dev, "Failed to enable XO\n");
return ret;
}
return 0;
}
static void remove_modem_proxy_votes(struct pil_desc *pil)
{
struct modem_data *drv = dev_get_drvdata(pil->dev);
clk_disable_unprepare(drv->xo);
}
static int modem_reset(struct pil_desc *pil)
{
u32 reg;
const struct modem_data *drv = dev_get_drvdata(pil->dev);
phys_addr_t start_addr = pil_get_entry_addr(pil);
/* Put modem AHB0,1,2 clocks into reset */
writel_relaxed(BIT(0) | BIT(1), drv->cbase + MAHB0_SFAB_PORT_RESET);
writel_relaxed(BIT(7), drv->cbase + MAHB1_CLK_CTL);
writel_relaxed(BIT(7), drv->cbase + MAHB2_CLK_CTL);
/* Vote for pll8 on behalf of the modem */
reg = readl_relaxed(drv->cbase + PLL_ENA_MARM);
reg |= BIT(8);
writel_relaxed(reg, drv->cbase + PLL_ENA_MARM);
/* Wait for PLL8 to enable */
while (!(readl_relaxed(drv->cbase + PLL8_STATUS) & BIT(16)))
cpu_relax();
/* Set MAHB1 divider to Div-5 to run MAHB1,2 and sfab at 79.8 Mhz*/
writel_relaxed(0x4, drv->cbase + MAHB1_NS);
/* Vote for modem AHB1 and 2 clocks to be on on behalf of the modem */
reg = readl_relaxed(drv->cbase + MARM_CLK_BRANCH_ENA_VOTE);
reg |= BIT(0) | BIT(1);
writel_relaxed(reg, drv->cbase + MARM_CLK_BRANCH_ENA_VOTE);
/* Source marm_clk off of PLL8 */
reg = readl_relaxed(drv->cbase + MARM_CLK_SRC_CTL);
if ((reg & 0x1) == 0) {
writel_relaxed(0x3, drv->cbase + MARM_CLK_SRC1_NS);
reg |= 0x1;
} else {
writel_relaxed(0x3, drv->cbase + MARM_CLK_SRC0_NS);
reg &= ~0x1;
}
writel_relaxed(reg | 0x2, drv->cbase + MARM_CLK_SRC_CTL);
/*
* Force core on and periph on signals to remain active during halt
* for marm_clk and mahb2_clk
*/
writel_relaxed(0x6F, drv->cbase + MARM_CLK_FS);
writel_relaxed(0x6F, drv->cbase + MAHB2_CLK_FS);
/*
* Enable all of the marm_clk branches, cxo sourced marm branches,
* and sleep clock branches
*/
writel_relaxed(0x10, drv->cbase + MARM_CLK_CTL);
writel_relaxed(0x10, drv->cbase + MAHB0_CLK_CTL);
writel_relaxed(0x10, drv->cbase + SFAB_MSS_S_HCLK_CTL);
writel_relaxed(0x10, drv->cbase + MSS_MODEM_CXO_CLK_CTL);
writel_relaxed(0x10, drv->cbase + MSS_SLP_CLK_CTL);
writel_relaxed(0x10, drv->cbase + MSS_MARM_SYS_REF_CLK_CTL);
/* Wait for above clocks to be turned on */
while (readl_relaxed(drv->cbase + CLK_HALT_MSS_SMPSS_MISC_STATE) &
(BIT(7) | BIT(8) | BIT(9) | BIT(10) | BIT(4) | BIT(6)))
cpu_relax();
/* Take MAHB0,1,2 clocks out of reset */
writel_relaxed(0x0, drv->cbase + MAHB2_CLK_CTL);
writel_relaxed(0x0, drv->cbase + MAHB1_CLK_CTL);
writel_relaxed(0x0, drv->cbase + MAHB0_SFAB_PORT_RESET);
mb();
/* Setup exception vector table base address */
writel_relaxed(start_addr | 0x1, drv->base + MARM_BOOT_CONTROL);
/* Wait for vector table to be setup */
mb();
/* Bring modem out of reset */
writel_relaxed(0x0, drv->cbase + MARM_RESET);
return 0;
}
static int modem_pil_shutdown(struct pil_desc *pil)
{
u32 reg;
const struct modem_data *drv = dev_get_drvdata(pil->dev);
/* Put modem into reset */
writel_relaxed(0x1, drv->cbase + MARM_RESET);
mb();
/* Put modem AHB0,1,2 clocks into reset */
writel_relaxed(BIT(0) | BIT(1), drv->cbase + MAHB0_SFAB_PORT_RESET);
writel_relaxed(BIT(7), drv->cbase + MAHB1_CLK_CTL);
writel_relaxed(BIT(7), drv->cbase + MAHB2_CLK_CTL);
mb();
/*
* Disable all of the marm_clk branches, cxo sourced marm branches,
* and sleep clock branches
*/
writel_relaxed(0x0, drv->cbase + MARM_CLK_CTL);
writel_relaxed(0x0, drv->cbase + MAHB0_CLK_CTL);
writel_relaxed(0x0, drv->cbase + SFAB_MSS_S_HCLK_CTL);
writel_relaxed(0x0, drv->cbase + MSS_MODEM_CXO_CLK_CTL);
writel_relaxed(0x0, drv->cbase + MSS_SLP_CLK_CTL);
writel_relaxed(0x0, drv->cbase + MSS_MARM_SYS_REF_CLK_CTL);
/* Disable marm_clk */
reg = readl_relaxed(drv->cbase + MARM_CLK_SRC_CTL);
reg &= ~0x2;
writel_relaxed(reg, drv->cbase + MARM_CLK_SRC_CTL);
/* Clear modem's votes for ahb clocks */
writel_relaxed(0x0, drv->cbase + MARM_CLK_BRANCH_ENA_VOTE);
/* Clear modem's votes for PLLs */
writel_relaxed(0x0, drv->cbase + PLL_ENA_MARM);
return 0;
}
static struct pil_reset_ops pil_modem_ops = {
.auth_and_reset = modem_reset,
.shutdown = modem_pil_shutdown,
.proxy_vote = make_modem_proxy_votes,
.proxy_unvote = remove_modem_proxy_votes,
};
static int modem_init_image_trusted(struct pil_desc *pil, const u8 *metadata,
size_t size)
{
return pas_init_image(PAS_MODEM, metadata, size);
}
static int modem_reset_trusted(struct pil_desc *pil)
{
return pas_auth_and_reset(PAS_MODEM);
}
static int modem_shutdown_trusted(struct pil_desc *pil)
{
return pas_shutdown(PAS_MODEM);
}
static struct pil_reset_ops pil_modem_ops_trusted = {
.init_image = modem_init_image_trusted,
.auth_and_reset = modem_reset_trusted,
.shutdown = modem_shutdown_trusted,
.proxy_vote = make_modem_proxy_votes,
.proxy_unvote = remove_modem_proxy_votes,
};
static void modem_crash_shutdown(const struct subsys_desc *subsys)
{
struct modem_data *drv;
/* If modem hasn't already crashed, send SMSM_RESET. */
drv = container_of(subsys, struct modem_data, subsys_desc);
if (!(smsm_get_state(SMSM_MODEM_STATE) & SMSM_RESET)) {
modem_unregister_notifier(&drv->notifier);
smsm_reset_modem(SMSM_RESET);
}
/* Wait to allow the modem to clean up caches etc. */
mdelay(5);
}
static irqreturn_t modem_wdog_bite_irq(int irq, void *dev_id)
{
struct modem_data *drv = dev_id;
schedule_work(&drv->fatal_work);
disable_irq_nosync(drv->irq);
return IRQ_HANDLED;
}
static void modem_unlock_timeout(struct work_struct *work)
{
struct modem_data *drv;
struct delayed_work *dwork = to_delayed_work(work);
pr_crit("Timeout waiting for modem to unlock.\n");
drv = container_of(dwork, struct modem_data, unlock_work);
/* The unlock didn't work, clear the reset */
writel_relaxed(0x0, drv->cbase + MSS_MODEM_RESET);
mb();
subsystem_restart_dev(drv->subsys);
enable_irq(drv->irq);
}
static void modem_fatal_fn(struct work_struct *work)
{
u32 modem_state;
u32 panic_smsm_states = SMSM_RESET | SMSM_SYSTEM_DOWNLOAD;
u32 reset_smsm_states = SMSM_SYSTEM_REBOOT_USR | SMSM_SYSTEM_PWRDWN_USR;
struct modem_data *drv;
drv = container_of(work, struct modem_data, fatal_work);
pr_err("Watchdog bite received from modem!\n");
modem_state = smsm_get_state(SMSM_MODEM_STATE);
pr_err("Modem SMSM state = 0x%x!\n", modem_state);
if (modem_state == 0 || modem_state & panic_smsm_states) {
subsystem_restart_dev(drv->subsys);
enable_irq(drv->irq);
} else if (modem_state & reset_smsm_states) {
pr_err("User-invoked system reset/powerdown.");
kernel_restart(NULL);
} else {
unsigned long timeout = msecs_to_jiffies(6000);
pr_err("Modem AHB locked up. Trying to free up modem!\n");
writel_relaxed(0x3, drv->cbase + MSS_MODEM_RESET);
/*
* If we are still alive (allowing for the 5 second
* delayed-panic-reboot), the modem is either still wedged or
* SMSM didn't come through. Force panic in that case.
*/
schedule_delayed_work(&drv->unlock_work, timeout);
}
}
static int modem_notif_handler(struct notifier_block *nb, unsigned long code,
void *p)
{
struct modem_data *drv = container_of(nb, struct modem_data, notifier);
if (code == MODEM_NOTIFIER_START_RESET) {
if (drv->ignore_smsm_ack) {
drv->ignore_smsm_ack = 0;
} else {
pr_err("Modem error fatal'ed.");
subsystem_restart_dev(drv->subsys);
}
}
return NOTIFY_DONE;
}
static int modem_start(const struct subsys_desc *subsys)
{
struct modem_data *drv;
drv = container_of(subsys, struct modem_data, subsys_desc);
return pil_boot(&drv->pil_desc);
}
static void modem_stop(const struct subsys_desc *subsys)
{
struct modem_data *drv;
drv = container_of(subsys, struct modem_data, subsys_desc);
pil_shutdown(&drv->pil_desc);
}
static int modem_shutdown(const struct subsys_desc *subsys)
{
struct modem_data *drv;
drv = container_of(subsys, struct modem_data, subsys_desc);
/*
* If the modem didn't already crash, setting SMSM_RESET here will help
* flush caches etc. The ignore_smsm_ack flag is set to ignore the
* SMSM_RESET notification that is generated due to the modem settings
* its own SMSM_RESET bit in response to the apps setting the apps
* SMSM_RESET bit.
*/
if (!(smsm_get_state(SMSM_MODEM_STATE) & SMSM_RESET)) {
drv->ignore_smsm_ack = 1;
smsm_reset_modem(SMSM_RESET);
}
/* Disable the modem watchdog to allow clean modem bootup */
writel_relaxed(0x0, drv->wdog + 0x8);
/*
* The write above needs to go through before the modem is powered up
* again.
*/
mb();
/* Wait here to allow the modem to clean up caches, etc. */
msleep(20);
pil_shutdown(&drv->pil_desc);
disable_irq_nosync(drv->irq);
return 0;
}
static int modem_powerup(const struct subsys_desc *subsys)
{
struct modem_data *drv;
int ret;
drv = container_of(subsys, struct modem_data, subsys_desc);
ret = pil_boot(&drv->pil_desc);
enable_irq(drv->irq);
return ret;
}
static int modem_ramdump(int enable, const struct subsys_desc *subsys)
{
struct modem_data *drv;
drv = container_of(subsys, struct modem_data, subsys_desc);
if (!enable)
return 0;
return pil_do_ramdump(&drv->pil_desc, drv->ramdump_dev);
}
static int __devinit pil_modem_driver_probe(struct platform_device *pdev)
{
struct modem_data *drv;
struct resource *res;
struct pil_desc *desc;
int ret;
drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
if (!drv)
return -ENOMEM;
platform_set_drvdata(pdev, drv);
drv->irq = platform_get_irq(pdev, 0);
if (drv->irq < 0)
return drv->irq;
drv->xo = devm_clk_get(&pdev->dev, "xo");
if (IS_ERR(drv->xo))
return PTR_ERR(drv->xo);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
drv->base = devm_request_and_ioremap(&pdev->dev, res);
if (!drv->base)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
drv->wdog = devm_request_and_ioremap(&pdev->dev, res);
if (!drv->wdog)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
if (!res)
return -EINVAL;
drv->cbase = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!drv->cbase)
return -ENOMEM;
desc = &drv->pil_desc;
desc->name = "modem";
desc->dev = &pdev->dev;
desc->owner = THIS_MODULE;
desc->proxy_timeout = 10000;
if (pas_supported(PAS_MODEM) > 0) {
desc->ops = &pil_modem_ops_trusted;
dev_info(&pdev->dev, "using secure boot\n");
} else {
desc->ops = &pil_modem_ops;
dev_info(&pdev->dev, "using non-secure boot\n");
}
ret = pil_desc_init(desc);
if (ret)
return ret;
drv->notifier.notifier_call = modem_notif_handler,
ret = modem_register_notifier(&drv->notifier);
if (ret)
goto err_notify;
drv->subsys_desc.name = "modem";
drv->subsys_desc.depends_on = "adsp";
drv->subsys_desc.dev = &pdev->dev;
drv->subsys_desc.owner = THIS_MODULE;
drv->subsys_desc.start = modem_start;
drv->subsys_desc.stop = modem_stop;
drv->subsys_desc.shutdown = modem_shutdown;
drv->subsys_desc.powerup = modem_powerup;
drv->subsys_desc.ramdump = modem_ramdump;
drv->subsys_desc.crash_shutdown = modem_crash_shutdown;
INIT_WORK(&drv->fatal_work, modem_fatal_fn);
INIT_DELAYED_WORK(&drv->unlock_work, modem_unlock_timeout);
drv->subsys = subsys_register(&drv->subsys_desc);
if (IS_ERR(drv->subsys)) {
ret = PTR_ERR(drv->subsys);
goto err_subsys;
}
drv->ramdump_dev = create_ramdump_device("modem", &pdev->dev);
if (!drv->ramdump_dev) {
ret = -ENOMEM;
goto err_ramdump;
}
ret = devm_request_irq(&pdev->dev, drv->irq, modem_wdog_bite_irq,
IRQF_TRIGGER_RISING, "modem_watchdog", drv);
if (ret)
goto err_irq;
return 0;
err_irq:
destroy_ramdump_device(drv->ramdump_dev);
err_ramdump:
subsys_unregister(drv->subsys);
err_subsys:
modem_unregister_notifier(&drv->notifier);
err_notify:
pil_desc_release(desc);
return ret;
}
static int __devexit pil_modem_driver_exit(struct platform_device *pdev)
{
struct modem_data *drv = platform_get_drvdata(pdev);
destroy_ramdump_device(drv->ramdump_dev);
subsys_unregister(drv->subsys);
modem_unregister_notifier(&drv->notifier);
pil_desc_release(&drv->pil_desc);
return 0;
}
static struct platform_driver pil_modem_driver = {
.probe = pil_modem_driver_probe,
.remove = __devexit_p(pil_modem_driver_exit),
.driver = {
.name = "pil_modem",
.owner = THIS_MODULE,
},
};
static int __init pil_modem_init(void)
{
return platform_driver_register(&pil_modem_driver);
}
module_init(pil_modem_init);
static void __exit pil_modem_exit(void)
{
platform_driver_unregister(&pil_modem_driver);
}
module_exit(pil_modem_exit);
MODULE_DESCRIPTION("Support for booting modem processors");
MODULE_LICENSE("GPL v2");