This patch adds APIs for the scm-32 and scm-64 to use for coherent memory
allocation.
Signed-off-by: Andy Gross <andy.gr...@linaro.org>
---
drivers/firmware/qcom_scm.c | 16 ++++++++++++++++
drivers/firmware/qcom_scm.h | 4 ++++
2 files changed, 20 insertions(+)
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index d4e9145..8f78938 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -20,6 +20,7 @@
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/clk.h>
+#include <linux/dma-mapping.h>
#include "qcom_scm.h"
@@ -158,6 +159,21 @@ bool qcom_scm_is_available(void)
}
EXPORT_SYMBOL(qcom_scm_is_available);
+void *qcom_scm_alloc_buffer(size_t size, dma_addr_t *dma_addr,
+ gfp_t gfp)
+{
+ if (__scm)
+ return dma_alloc_writecombine(__scm->dev, size, dma_addr, gfp);
+ else
+ return ERR_PTR(-ENODEV);
+}
+
+void qcom_scm_free_buffer(size_t size, void *cpu_addr,
+ dma_addr_t dma_addr)
+{
+ dma_free_writecombine(__scm->dev, size, cpu_addr, dma_addr);
+}
+
static int qcom_scm_probe(struct platform_device *pdev)
{
struct qcom_scm *scm;
diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
index 7dcc733..848c7de 100644
--- a/drivers/firmware/qcom_scm.h
+++ b/drivers/firmware/qcom_scm.h
@@ -36,6 +36,10 @@ extern int __qcom_scm_is_call_available(u32 svc_id, u32
cmd_id);
extern int __qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt,
u32 *resp);
+extern void *qcom_scm_alloc_buffer(size_t size, dma_addr_t *dma_addr,
+ gfp_t gfp);
+extern void qcom_scm_free_buffer(size_t size, void *virt_addr,
+ dma_addr_t dma_addr);
/* common error codes */
#define QCOM_SCM_ENOMEM -5
#define QCOM_SCM_EOPNOTSUPP -4
--
1.9.1
