Bootloader and firmware for SM8650 and older chipsets expect node
name as "qcom_scm", in order to patch the wait queue IRQ information.
However, DeviceTree uses node name "scm" and this mismatch prevents
firmware from correctly identifying waitqueue IRQ information. Waitqueue
IRQ is used for signaling between secure and non-secure worlds.
To resolve this, introduce qcom_scm_get_waitq_irq() that'll get the
hardware IRQ number to be used from firmware instead of relying on data
provided by devicetree, thereby bypassing the DeviceTree node name
mismatch.
This hardware IRQ number is converted to a Linux IRQ number using newly
defined fill_irq_fwspec_params(). This Linux IRQ number is then supplied
to the threaded_irq call.
Signed-off-by: Unnathi Chalicheemala <quic_uchalich@quicinc.com>
---
drivers/firmware/qcom/qcom_scm.c | 52 +++++++++++++++++++++++++++++++-
drivers/firmware/qcom/qcom_scm.h | 1 +
2 files changed, 52 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index 10986cb11ec0..ec1205474a3a 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -11,6 +11,7 @@
#include <linux/completion.h>
#include <linux/cpumask.h>
#include <linux/dma-mapping.h>
+#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/firmware/qcom/qcom_scm.h>
@@ -35,6 +36,11 @@
static u32 download_mode;
+#define GIC_SPI_BASE 32
+#define GIC_MAX_SPI 1019 // SPIs in GICv3 spec range from 32..1019
+#define GIC_ESPI_BASE 4096
+#define GIC_MAX_ESPI 5119 // ESPIs in GICv3 spec range from 4096..5119
+
struct qcom_scm {
struct device *dev;
struct clk *core_clk;
@@ -1830,6 +1836,50 @@ bool qcom_scm_is_available(void)
}
EXPORT_SYMBOL_GPL(qcom_scm_is_available);
+static int qcom_scm_fill_irq_fwspec_params(struct irq_fwspec *fwspec, u32 virq)
+{
+ if (virq >= GIC_SPI_BASE && virq <= GIC_SPI_MAX) {
+ fwspec->param[0] = GIC_SPI;
+ fwspec->param[1] = virq - GIC_SPI_BASE;
+ } else if (virq >= GIC_ESPI_BASE && virq <= GIC_ESPI_MAX) {
+ fwspec->param[0] = GIC_ESPI;
+ fwspec->param[1] = virq - GIC_ESPI_BASE;
+ } else {
+ WARN(1, "Unexpected virq: %d\n", virq);
+ return -ENXIO;
+ }
+ fwspec->param[2] = IRQ_TYPE_EDGE_RISING;
+ fwspec->param_count = 3;
+
+ return 0;
+}
+
+static int qcom_scm_get_waitq_irq(void)
+{
+ int ret;
+ u32 hwirq;
+ struct qcom_scm_desc desc = {
+ .svc = QCOM_SCM_SVC_WAITQ,
+ .cmd = QCOM_SCM_WAITQ_GET_INFO,
+ .owner = ARM_SMCCC_OWNER_SIP
+ };
+ struct qcom_scm_res res;
+ struct irq_fwspec fwspec;
+
+ ret = qcom_scm_call_atomic(__scm->dev, &desc, &res);
+ if (ret)
+ return ret;
+
+ fwspec.fwnode = of_node_to_fwnode(__scm->dev->of_node);
+ hwirq = res.result[1] & GENMASK(15, 0);
+ ret = qcom_scm_fill_irq_fwspec_params(&fwspec, hwirq);
+ if (ret)
+ return ret;
+ ret = irq_create_fwspec_mapping(&fwspec);
+
+ return ret;
+}
+
static int qcom_scm_assert_valid_wq_ctx(u32 wq_ctx)
{
/* FW currently only supports a single wq_ctx (zero).
@@ -1986,7 +2036,7 @@ static int qcom_scm_probe(struct platform_device *pdev)
/* Let all above stores be available after this */
smp_store_release(&__scm, scm);
- irq = platform_get_irq_optional(pdev, 0);
+ irq = qcom_scm_get_waitq_irq();
if (irq < 0) {
if (irq != -ENXIO)
return irq;
diff --git a/drivers/firmware/qcom/qcom_scm.h b/drivers/firmware/qcom/qcom_scm.h
index 685b8f59e7a6..ab0f88f5f777 100644
--- a/drivers/firmware/qcom/qcom_scm.h
+++ b/drivers/firmware/qcom/qcom_scm.h
@@ -143,6 +143,7 @@ struct qcom_tzmem_pool *qcom_scm_get_tzmem_pool(void);
#define QCOM_SCM_SVC_WAITQ 0x24
#define QCOM_SCM_WAITQ_RESUME 0x02
#define QCOM_SCM_WAITQ_GET_WQ_CTX 0x03
+#define QCOM_SCM_WAITQ_GET_INFO 0x04
#define QCOM_SCM_SVC_GPU 0x28
#define QCOM_SCM_SVC_GPU_INIT_REGS 0x01
--
2.34.1On Mon, Nov 04, 2024 at 08:20:55AM -0800, Unnathi Chalicheemala wrote:
> Bootloader and firmware for SM8650 and older chipsets expect node
> name as "qcom_scm", in order to patch the wait queue IRQ information.
> However, DeviceTree uses node name "scm" and this mismatch prevents
> firmware from correctly identifying waitqueue IRQ information. Waitqueue
> IRQ is used for signaling between secure and non-secure worlds.
>
> To resolve this, introduce qcom_scm_get_waitq_irq() that'll get the
> hardware IRQ number to be used from firmware instead of relying on data
> provided by devicetree, thereby bypassing the DeviceTree node name
> mismatch.
>
> This hardware IRQ number is converted to a Linux IRQ number using newly
> defined fill_irq_fwspec_params(). This Linux IRQ number is then supplied
> to the threaded_irq call.
>
> Signed-off-by: Unnathi Chalicheemala <quic_uchalich@quicinc.com>
> ---
> drivers/firmware/qcom/qcom_scm.c | 52 +++++++++++++++++++++++++++++++-
> drivers/firmware/qcom/qcom_scm.h | 1 +
> 2 files changed, 52 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
> index 10986cb11ec0..ec1205474a3a 100644
> --- a/drivers/firmware/qcom/qcom_scm.c
> +++ b/drivers/firmware/qcom/qcom_scm.c
> @@ -11,6 +11,7 @@
> #include <linux/completion.h>
> #include <linux/cpumask.h>
> #include <linux/dma-mapping.h>
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> #include <linux/err.h>
> #include <linux/export.h>
> #include <linux/firmware/qcom/qcom_scm.h>
> @@ -35,6 +36,11 @@
>
> static u32 download_mode;
>
> +#define GIC_SPI_BASE 32
> +#define GIC_MAX_SPI 1019 // SPIs in GICv3 spec range from 32..1019
> +#define GIC_ESPI_BASE 4096
> +#define GIC_MAX_ESPI 5119 // ESPIs in GICv3 spec range from 4096..5119
> +
> struct qcom_scm {
> struct device *dev;
> struct clk *core_clk;
> @@ -1830,6 +1836,50 @@ bool qcom_scm_is_available(void)
> }
> EXPORT_SYMBOL_GPL(qcom_scm_is_available);
>
> +static int qcom_scm_fill_irq_fwspec_params(struct irq_fwspec *fwspec, u32 virq)
> +{
> + if (virq >= GIC_SPI_BASE && virq <= GIC_SPI_MAX) {
> + fwspec->param[0] = GIC_SPI;
> + fwspec->param[1] = virq - GIC_SPI_BASE;
> + } else if (virq >= GIC_ESPI_BASE && virq <= GIC_ESPI_MAX) {
> + fwspec->param[0] = GIC_ESPI;
> + fwspec->param[1] = virq - GIC_ESPI_BASE;
> + } else {
> + WARN(1, "Unexpected virq: %d\n", virq);
> + return -ENXIO;
> + }
> + fwspec->param[2] = IRQ_TYPE_EDGE_RISING;
> + fwspec->param_count = 3;
> +
> + return 0;
> +}
> +
> +static int qcom_scm_get_waitq_irq(void)
> +{
> + int ret;
> + u32 hwirq;
> + struct qcom_scm_desc desc = {
> + .svc = QCOM_SCM_SVC_WAITQ,
> + .cmd = QCOM_SCM_WAITQ_GET_INFO,
> + .owner = ARM_SMCCC_OWNER_SIP
> + };
> + struct qcom_scm_res res;
> + struct irq_fwspec fwspec;
> +
> + ret = qcom_scm_call_atomic(__scm->dev, &desc, &res);
> + if (ret)
> + return ret;
> +
What would be the return value on older firmware where WAITQ_GET_INFO
command is not supported? See below comment on the expected return
value from qcom_scm_get_waitq_irq().
> + fwspec.fwnode = of_node_to_fwnode(__scm->dev->of_node);
> + hwirq = res.result[1] & GENMASK(15, 0);
> + ret = qcom_scm_fill_irq_fwspec_params(&fwspec, hwirq);
> + if (ret)
> + return ret;
> + ret = irq_create_fwspec_mapping(&fwspec);
> +
> + return ret;
> +}
> +
> static int qcom_scm_assert_valid_wq_ctx(u32 wq_ctx)
> {
> /* FW currently only supports a single wq_ctx (zero).
> @@ -1986,7 +2036,7 @@ static int qcom_scm_probe(struct platform_device *pdev)
> /* Let all above stores be available after this */
> smp_store_release(&__scm, scm);
>
> - irq = platform_get_irq_optional(pdev, 0);
> + irq = qcom_scm_get_waitq_irq();
> if (irq < 0) {
> if (irq != -ENXIO)
> return irq;
Here we fail probe for any return value other than -ENXIO, would that
cause problems with older firmware?
Thanks,
Pavan
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