[PATCH v13] firmware: qcom: scm: Modify only the download bits in TCSR register

[Mukesh Ojha]

Crashdump collection is done based on DLOAD bits of TCSR register.
To retain other bits, scm driver need to read the register and
modify only the DLOAD bits, as other bits in TCSR may have their
own significance.

Co-developed-by: Poovendhan Selvaraj <quic_poovendh@xxxxxxxxxxx>
Signed-off-by: Poovendhan Selvaraj <quic_poovendh@xxxxxxxxxxx>
Signed-off-by: Mukesh Ojha <quic_mojha@xxxxxxxxxxx>
Tested-by: Kathiravan Thirumoorthy <quic_kathirav@xxxxxxxxxxx> # IPQ9574 and IPQ5332
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Reviewed-by: Elliot Berman <quic_eberman@xxxxxxxxxxx>
---
This patch should be applied on top of below series
https://lore.kernel.org/lkml/1711034642-22860-1-git-send-email-quic_mojha@xxxxxxxxxxx/


Changes in v13:
 - Removed the usage of exported qcom_scm_io_rmw() and kept it static.
 - Kept the T-by and R-by tag as there is not much change in the approach.

 v12:

 https://lore.kernel.org/lkml/20240227155308.18395-3-quic_mojha@xxxxxxxxxxx/
 https://lore.kernel.org/lkml/ncyanjtxtqyx236d5tfm46nepvy6ncxikonc6g6hlddhx2joee@jqjhfxtu3sr6/

 All the past v1 to v12 can be found in below link cover-letter.
 - https://lore.kernel.org/lkml/20240227155308.18395-1-quic_mojha@xxxxxxxxxxx/

 drivers/firmware/qcom/qcom_scm.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index f014a934a603..70775ead1508 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -4,6 +4,8 @@
  */
 
 #include <linux/arm-smccc.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
 #include <linux/clk.h>
 #include <linux/completion.h>
 #include <linux/cpumask.h>
@@ -114,6 +116,10 @@ static const u8 qcom_scm_cpu_warm_bits[QCOM_SCM_BOOT_MAX_CPUS] = {
 #define QCOM_SMC_WAITQ_FLAG_WAKE_ONE	BIT(0)
 #define QCOM_SMC_WAITQ_FLAG_WAKE_ALL	BIT(1)
 
+#define QCOM_DLOAD_MASK		GENMASK(5, 4)
+#define QCOM_DLOAD_NODUMP	0
+#define QCOM_DLOAD_FULLDUMP	1
+
 static const char * const qcom_scm_convention_names[] = {
 	[SMC_CONVENTION_UNKNOWN] = "unknown",
 	[SMC_CONVENTION_ARM_32] = "smc arm 32",
@@ -493,13 +499,29 @@ static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
 	return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
 }
 
+static int qcom_scm_io_rmw(phys_addr_t addr, unsigned int mask, unsigned int val)
+{
+	unsigned int old;
+	unsigned int new;
+	int ret;
+
+	ret = qcom_scm_io_readl(addr, &old);
+	if (ret)
+		return ret;
+
+	new = (old & ~mask) | (val & mask);
+
+	return qcom_scm_io_writel(addr, new);
+}
+
 static void qcom_scm_set_download_mode(bool enable)
 {
+	u32 val = enable ? QCOM_DLOAD_FULLDUMP : QCOM_DLOAD_NODUMP;
 	int ret = 0;
 
 	if (__scm->dload_mode_addr) {
-		ret = qcom_scm_io_writel(__scm->dload_mode_addr,
-					 enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0);
+		ret = qcom_scm_io_rmw(__scm->dload_mode_addr, QCOM_DLOAD_MASK,
+				      FIELD_PREP(QCOM_DLOAD_MASK, val));
 	} else if (__qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_BOOT,
 						QCOM_SCM_BOOT_SET_DLOAD_MODE)) {
 		ret = __qcom_scm_set_dload_mode(__scm->dev, enable);
-- 
2.7.4