Currently on Qualcomm SoC, download_mode is enabled if
CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT is selected.
Refactor the code such that it supports multiple download
modes and drop CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT config
instead, give interface to set the download mode from
module parameter.
Signed-off-by: Mukesh Ojha <quic_mojha@xxxxxxxxxxx>
---
drivers/firmware/Kconfig | 11 ---------
drivers/firmware/qcom_scm.c | 56 +++++++++++++++++++++++++++++++++++++++------
2 files changed, 49 insertions(+), 18 deletions(-)
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index b59e3041fd62..ff7e9f330559 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -215,17 +215,6 @@ config MTK_ADSP_IPC
config QCOM_SCM
tristate
-config QCOM_SCM_DOWNLOAD_MODE_DEFAULT
- bool "Qualcomm download mode enabled by default"
- depends on QCOM_SCM
- help
- A device with "download mode" enabled will upon an unexpected
- warm-restart enter a special debug mode that allows the user to
- "download" memory content over USB for offline postmortem analysis.
- The feature can be enabled/disabled on the kernel command line.
-
- Say Y here to enable "download mode" by default.
-
config SYSFB
bool
select BOOT_VESA_SUPPORT
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index a9ff77d16c42..946cb0f76a17 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -18,13 +18,13 @@
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/clk.h>
+#include <linux/kstrtox.h>
#include <linux/reset-controller.h>
#include <linux/arm-smccc.h>
#include "qcom_scm.h"
-static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT);
-module_param(download_mode, bool, 0);
+static u32 download_mode;
#define SCM_HAS_CORE_CLK BIT(0)
#define SCM_HAS_IFACE_CLK BIT(1)
@@ -82,6 +82,11 @@ static const char * const qcom_scm_convention_names[] = {
[SMC_CONVENTION_LEGACY] = "smc legacy",
};
+static const char * const download_mode_name[] = {
+ [QCOM_DOWNLOAD_NODUMP] = "off",
+ [QCOM_DOWNLOAD_FULLDUMP] = "full",
+};
+
static struct qcom_scm *__scm;
static int qcom_scm_clk_enable(void)
@@ -442,8 +447,9 @@ static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
}
-static void qcom_scm_set_download_mode(bool enable)
+static void qcom_scm_set_download_mode(u32 download_mode)
{
+ bool enable = !!download_mode;
bool avail;
int val;
int ret = 0;
@@ -454,7 +460,7 @@ static void qcom_scm_set_download_mode(bool enable)
if (avail) {
ret = __qcom_scm_set_dload_mode(__scm->dev, enable);
} else if (__scm->dload_mode_addr) {
- val = (enable ? QCOM_DOWNLOAD_FULLDUMP : QCOM_DOWNLOAD_NODUMP);
+ val = download_mode;
val <<= QCOM_DOWNLOAD_MODE_SHIFT;
ret = qcom_scm_io_update_field(__scm->dload_mode_addr,
QCOM_DOWNLOAD_MODE_MASK, val);
@@ -1425,6 +1431,42 @@ static irqreturn_t qcom_scm_irq_handler(int irq, void *data)
return IRQ_HANDLED;
}
+static int get_download_mode(char *buffer, const struct kernel_param *kp)
+{
+ if (download_mode >= ARRAY_SIZE(download_mode_name))
+ return sysfs_emit(buffer, "unknown mode\n");
+
+ return sysfs_emit(buffer, "%s\n", download_mode_name[download_mode]);
+}
+
+static int set_download_mode(const char *val, const struct kernel_param *kp)
+{
+ u32 old = download_mode;
+ int ret;
+
+ ret = sysfs_match_string(download_mode_name, val);
+ if (ret < 0) {
+ download_mode = old;
+ pr_err("qcom_scm: unknown download mode: %s\n", val);
+ return -EINVAL;
+ }
+
+ download_mode = ret;
+ if (__scm)
+ qcom_scm_set_download_mode(download_mode);
+
+ return 0;
+}
+
+static const struct kernel_param_ops download_mode_param_ops = {
+ .get = get_download_mode,
+ .set = set_download_mode,
+};
+
+module_param_cb(download_mode, &download_mode_param_ops, NULL, 0644);
+MODULE_PARM_DESC(download_mode,
+ "download mode: off/full are acceptable values");
+
static int qcom_scm_probe(struct platform_device *pdev)
{
struct qcom_scm *scm;
@@ -1518,12 +1560,12 @@ static int qcom_scm_probe(struct platform_device *pdev)
__get_convention();
/*
- * If requested enable "download mode", from this point on warmboot
+ * If "download mode" is requested, from this point on warmboot
* will cause the boot stages to enter download mode, unless
* disabled below by a clean shutdown/reboot.
*/
if (download_mode)
- qcom_scm_set_download_mode(true);
+ qcom_scm_set_download_mode(download_mode);
return 0;
}
@@ -1531,7 +1573,7 @@ static int qcom_scm_probe(struct platform_device *pdev)
static void qcom_scm_shutdown(struct platform_device *pdev)
{
/* Clean shutdown, disable download mode to allow normal restart */
- qcom_scm_set_download_mode(false);
+ qcom_scm_set_download_mode(QCOM_DOWNLOAD_NODUMP);
}
static const struct of_device_id qcom_scm_dt_match[] = {
--
2.7.4
