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Subject[PATCH 3/4] firmware: qcom_scm: Refactor code to support multiple download mode
Date
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 the config.

Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
---
drivers/firmware/Kconfig | 11 -----------
drivers/firmware/qcom_scm.c | 45 +++++++++++++++++++++++++++++++++++++++------
include/linux/qcom_scm.h | 4 ++++
3 files changed, 43 insertions(+), 17 deletions(-)

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index b59e304..ff7e9f3 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 c376ba8..4975d3c 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -20,8 +20,43 @@

#include "qcom_scm.h"

-static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT);
-module_param(download_mode, bool, 0);
+static unsigned int download_mode;
+static struct qcom_scm *__scm;
+static void qcom_scm_set_download_mode(bool enable);
+static int set_dload_mode(const char *val, const struct kernel_param *kp)
+{
+ int ret;
+ int old_mode = download_mode;
+
+ ret = param_set_int(val, kp);
+ if (ret)
+ return ret;
+
+ switch (download_mode) {
+ case QCOM_DOWNLOAD_FULLDUMP:
+ if (__scm)
+ qcom_scm_set_download_mode(true);
+ break;
+ case QCOM_DOWNLOAD_NODUMP:
+ if (__scm)
+ qcom_scm_set_download_mode(false);
+ break;
+ default:
+ pr_err("unknown download mode\n");
+ download_mode = old_mode;
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct kernel_param_ops dload_mode_param_ops = {
+ .set = set_dload_mode,
+ .get = param_get_hexint,
+};
+module_param_cb(download_mode, &dload_mode_param_ops, &download_mode, 0644);
+MODULE_PARM_DESC(download_mode,
+ "Download mode: 0x0=no dump mode (default), 0x10=full dump mode");

#define SCM_HAS_CORE_CLK BIT(0)
#define SCM_HAS_IFACE_CLK BIT(1)
@@ -70,8 +105,6 @@ static const char * const qcom_scm_convention_names[] = {
[SMC_CONVENTION_LEGACY] = "smc legacy",
};

-static struct qcom_scm *__scm;
-
static int qcom_scm_clk_enable(void)
{
int ret;
@@ -435,8 +468,8 @@ static void qcom_scm_set_download_mode(bool enable)
}

ret = qcom_scm_io_writel(__scm->dload_mode_addr, enable ?
- dload_addr_val | QCOM_SCM_BOOT_SET_DLOAD_MODE :
- dload_addr_val & ~(QCOM_SCM_BOOT_SET_DLOAD_MODE));
+ ((dload_addr_val & ~QCOM_DOWNLOAD_MODE_MASK) | download_mode) :
+ dload_addr_val & ~QCOM_DOWNLOAD_MODE_MASK);
} else {
dev_err(__scm->dev,
"No available mechanism for setting download mode\n");
diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
index f833564..dd6aced 100644
--- a/include/linux/qcom_scm.h
+++ b/include/linux/qcom_scm.h
@@ -14,6 +14,10 @@
#define QCOM_SCM_CPU_PWR_DOWN_L2_OFF 0x1
#define QCOM_SCM_HDCP_MAX_REQ_CNT 5

+#define QCOM_DOWNLOAD_MODE_MASK 0x30
+#define QCOM_DOWNLOAD_NODUMP 0x0
+#define QCOM_DOWNLOAD_FULLDUMP 0x10
+
struct qcom_scm_hdcp_req {
u32 addr;
u32 val;
--
2.7.4
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