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NFC: driver: FR63179 Add NFC dynamic protection control

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Implemented NFC dynamic protection control feature in driver; performing
Ven GPIO enable/disable post TZ notifications in non-secure/secure zone
respectively.

Change-Id: I13dedf23987ce0b3b2a53881d35f6c3cf462cd92
This commit is contained in:
Mallikarjun S T
2022-04-09 21:09:35 +05:30
parent 9214369e79
commit eba3412350
4 changed files with 139 additions and 25 deletions
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127
nfc/common.c
View File

@@ -27,6 +27,8 @@
#include "common.h"
static int secure_zone = 1;
int nfc_parse_dt(struct device *dev, struct platform_configs *nfc_configs,
uint8_t interface)
{
@@ -385,6 +387,120 @@ long nfc_dev_compat_ioctl(struct file *pfile, unsigned int cmd,
}
#endif
/**
* nfc_post_init() - Configuraing Ven GPIO and hardware check
* @nfc_dev: nfc device data structure
*
* Configure GPIOs post notification from TZ, ensuring it's a non-secure zone.
*
* Return: 0 if Success(or no issue) and error ret code otherwise
*/
int nfc_post_init(struct nfc_dev *nfc_dev)
{
int ret=0;
struct platform_configs nfc_configs;
struct platform_gpio *nfc_gpio;
if (!nfc_dev)
return -ENODEV;
memcpy(&nfc_configs, &nfc_dev->configs, sizeof(struct platform_configs));
nfc_gpio = &nfc_configs.gpio;
ret = configure_gpio(nfc_gpio->ven, GPIO_OUTPUT);
if (ret) {
pr_err("%s: unable to request nfc reset gpio [%d]\n",
__func__, nfc_gpio->ven);
return ret;
}
ret = configure_gpio(nfc_gpio->dwl_req, GPIO_OUTPUT);
if (ret) {
pr_err("%s: unable to request nfc firm downl gpio [%d]\n",
__func__, nfc_gpio->dwl_req);
}
ret = nfcc_hw_check(nfc_dev);
if (ret || nfc_dev->nfc_state == NFC_STATE_UNKNOWN) {
pr_err("nfc hw check failed ret %d\n", ret);
gpio_free(nfc_gpio->dwl_req);
gpio_free(nfc_gpio->ven);
return ret;
}
/*Initialising sempahore to disbale NFC Ven GPIO only after eSE is power off flag is set */
sema_init(&sem_eSE_pwr_off,0);
pr_info("%s success\n", __func__);
return 0;
}
/**
* nfc_dynamic_protection_ioctl() - dynamic protection control
* @nfc_dev: nfc device data structure
* @sec_zone_trans: mode that we want to move to
* If sec_zone_trans = 1; transition from non-secure zone to secure zone
* If sec_zone_trans = 0; transition from secure zone to non - secure zone
*
* nfc periheral dynamic protection control. Depending on the sec_zone_trans value, device moves to
* secure zone and non-secure zone
*
* Return: -ENOIOCTLCMD if sec_zone_trans val is not supported, 0 if Success(or no issue)
* and error ret code otherwise
*/
int nfc_dynamic_protection_ioctl(struct nfc_dev *nfc_dev, unsigned long sec_zone_trans)
{
int ret = 0;
static int init_flag=1;
struct platform_gpio *nfc_gpio = &nfc_dev->configs.gpio;
if(sec_zone_trans == 1) {
/*check NFC is disabled, only then set Ven GPIO low*/
if(nfc_dev->cold_reset.is_nfc_enabled == false) {
pr_debug("%s: value %d\n", __func__, gpio_get_value(nfc_gpio->ven));
chk_eSE_pwr_off = 1;
/*check if eSE is active, if yes, wait max of 1sec, until it's inactive */
if(nfc_dev->is_ese_session_active == true) {
if(down_timeout(&sem_eSE_pwr_off, msecs_to_jiffies(1000))) {
/*waited for 1sec yet eSE not turned off, so, ignoring eSE power off*/
pr_info("Forcefull shutdown of eSE\n");
}
}
ret = nfc_ioctl_power_states(nfc_dev, 0);
/*set driver as secure zone, such that no ioctl calls are allowed*/
secure_zone=1;
pr_info("Driver Secure flag set successful\n");
} else {
ret = -1;
}
}
else if(sec_zone_trans == 0) {
chk_eSE_pwr_off = 0;
secure_zone=0;
if(init_flag) {
/*Initialize once,only during the first non-secure entry*/
ret = nfc_post_init(nfc_dev);
if(ret == 0)
init_flag=0;
}
else {
ret = nfc_ioctl_power_states(nfc_dev, 1);
}
pr_info("Func Driver Secure flag clear successful\n");
} else {
pr_info("INVALID ARG\n");
ret = -ENOIOCTLCMD;
}
return ret;
}
/**
* nfc_dev_ioctl - used to set or get data from upper layer.
* @pfile file node for opened device.
@@ -406,6 +522,14 @@ long nfc_dev_ioctl(struct file *pfile, unsigned int cmd, unsigned long arg)
if (!nfc_dev)
return -ENODEV;
/*Avoiding ioctl call in secure zone*/
if(secure_zone) {
if(cmd!=NFC_SECURE_ZONE) {
pr_debug("nfc_dev_ioctl failed\n");
return -1;
}
}
pr_debug("%s: cmd = %x arg = %zx\n", __func__, cmd, arg);
switch (cmd) {
case NFC_SET_PWR:
@@ -424,6 +548,9 @@ long nfc_dev_ioctl(struct file *pfile, unsigned int cmd, unsigned long arg)
pr_debug("nfc ese cold reset ioctl\n");
ret = ese_cold_reset_ioctl(nfc_dev, arg);
break;
case NFC_SECURE_ZONE:
ret = nfc_dynamic_protection_ioctl(nfc_dev, arg);
break;
default:
pr_err("%s: bad cmd %lu\n", __func__, arg);
ret = -ENOIOCTLCMD;