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Date: Wed, 15 Jul 2015 11:58:06 -0700
From: Bjorn Andersson <bjorn.andersson@...ymobile.com>
To: Andy Gross <agross@...eaurora.org>
CC: Stephen Boyd <sboyd@...eaurora.org>,
<linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
<linux-soc@...r.kernel.org>
Subject: [PATCH v2] firmware: qcom: scm: Peripheral Authentication Service
This adds the Peripheral Authentication Service (PAS) interface to the
Qualcomm SCM interface. The API is used to authenticate and boot a range
of external processors in various Qualcomm platforms.
Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
---
Changes since v1:
- Big endian compatibility
drivers/firmware/qcom_scm-32.c | 93 ++++++++++++++++++++++++++++++++++++++++++
drivers/firmware/qcom_scm.c | 78 +++++++++++++++++++++++++++++++++++
drivers/firmware/qcom_scm.h | 12 ++++++
include/linux/qcom_scm.h | 6 +++
4 files changed, 189 insertions(+)
diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
index 1bd6f9c34331..81d9c59f3ccc 100644
--- a/drivers/firmware/qcom_scm-32.c
+++ b/drivers/firmware/qcom_scm-32.c
@@ -23,6 +23,7 @@
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/qcom_scm.h>
+#include <linux/dma-mapping.h>
#include <asm/outercache.h>
#include <asm/cacheflush.h>
@@ -501,3 +502,95 @@ int __qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp)
return qcom_scm_call(QCOM_SCM_SVC_HDCP, QCOM_SCM_CMD_HDCP,
req, req_cnt * sizeof(*req), resp, sizeof(*resp));
}
+
+bool __qcom_scm_pas_supported(u32 peripheral)
+{
+ u32 ret_val;
+ int ret;
+
+ ret = qcom_scm_call(QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_IS_SUPPORTED_CMD,
+ &peripheral, sizeof(peripheral),
+ &ret_val, sizeof(ret_val));
+
+ return ret ? false : !!ret_val;
+}
+
+int __qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size)
+{
+ dma_addr_t mdata_phys;
+ void *mdata_buf;
+ __le32 scm_ret;
+ int ret;
+ struct pas_init_image_req {
+ __le32 proc;
+ __le32 image_addr;
+ } request;
+
+ /*
+ * During the scm call memory protection will be enabled for the meta
+ * data blob, so make sure it's physically contiguous, 4K aligned and
+ * non-cachable to avoid XPU violations.
+ */
+ mdata_buf = dma_alloc_coherent(NULL, size, &mdata_phys, GFP_KERNEL);
+ if (!mdata_buf) {
+ pr_err("Allocation of metadata buffer failed.\n");
+ return -ENOMEM;
+ }
+ memcpy(mdata_buf, metadata, size);
+
+ request.proc = cpu_to_le32(peripheral);
+ request.image_addr = cpu_to_le32(mdata_phys);
+
+ ret = qcom_scm_call(QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_INIT_IMAGE_CMD,
+ &request, sizeof(request),
+ &scm_ret, sizeof(scm_ret));
+
+ dma_free_coherent(NULL, size, mdata_buf, mdata_phys);
+
+ return ret ? : le32_to_cpu(scm_ret);
+}
+
+int __qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr, phys_addr_t size)
+{
+ __le32 scm_ret;
+ int ret;
+ struct pas_init_image_req {
+ __le32 proc;
+ __le32 addr;
+ __le32 len;
+ } request;
+
+ request.proc = cpu_to_le32(peripheral);
+ request.addr = cpu_to_le32(addr);
+ request.len = cpu_to_le32(size);
+
+ ret = qcom_scm_call(QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_MEM_SETUP_CMD,
+ &request, sizeof(request),
+ &scm_ret, sizeof(scm_ret));
+
+ return ret ? : le32_to_cpu(scm_ret);
+}
+
+int __qcom_scm_pas_auth_and_reset(u32 peripheral)
+{
+ __le32 scm_ret;
+ int ret;
+
+ ret = qcom_scm_call(QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_AUTH_AND_RESET_CMD,
+ &peripheral, sizeof(peripheral),
+ &scm_ret, sizeof(scm_ret));
+
+ return ret ? : le32_to_cpu(scm_ret);
+}
+
+int __qcom_scm_pas_shutdown(u32 peripheral)
+{
+ __le32 scm_ret;
+ int ret;
+
+ ret = qcom_scm_call(QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_SHUTDOWN_CMD,
+ &peripheral, sizeof(peripheral),
+ &scm_ret, sizeof(scm_ret));
+
+ return ret ? : le32_to_cpu(scm_ret);
+}
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 45c008d68891..ee7150d93b29 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -94,3 +94,81 @@ int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp)
return __qcom_scm_hdcp_req(req, req_cnt, resp);
}
EXPORT_SYMBOL(qcom_scm_hdcp_req);
+
+/**
+ * qcom_scm_pas_supported() - Check if the peripheral authentication service is
+ * available for the given peripherial
+ * @peripheral: peripheral id
+ *
+ * Returns true if PAS is supported for this peripheral, otherwise false.
+ */
+bool qcom_scm_pas_supported(u32 peripheral)
+{
+ int ret;
+
+ ret = __qcom_scm_is_call_available(QCOM_SCM_SVC_PIL,
+ QCOM_SCM_PAS_IS_SUPPORTED_CMD);
+ if (ret <= 0)
+ return false;
+
+ return __qcom_scm_pas_supported(peripheral);
+}
+EXPORT_SYMBOL(qcom_scm_pas_supported);
+
+/**
+ * qcom_scm_pas_init_image() - Initialize peripheral authentication service
+ * state machine for a given peripheral, using the
+ * metadata
+ * @peripheral: peripheral id
+ * @metadata: pointer to memory containing ELF header, program header table
+ * and optional blob of data used for authenticating the metadata
+ * and the rest of the firmware
+ * @size: size of the metadata
+ *
+ * Returns 0 on success.
+ */
+int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size)
+{
+ return __qcom_scm_pas_init_image(peripheral, metadata, size);
+}
+EXPORT_SYMBOL(qcom_scm_pas_init_image);
+
+/**
+ * qcom_scm_pas_mem_setup() - Prepare the memory related to a given peripheral
+ * for firmware loading
+ * @peripheral: peripheral id
+ * @addr: start address of memory area to prepare
+ * @size: size of the memory area to prepare
+ *
+ * Returns 0 on success.
+ */
+int qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr, phys_addr_t size)
+{
+ return __qcom_scm_pas_mem_setup(peripheral, addr, size);
+}
+EXPORT_SYMBOL(qcom_scm_pas_mem_setup);
+
+/**
+ * qcom_scm_pas_auth_and_reset() - Authenticate the given peripheral firmware
+ * and reset the remote processor
+ * @peripheral: peripheral id
+ *
+ * Return 0 on success.
+ */
+int qcom_scm_pas_auth_and_reset(u32 peripheral)
+{
+ return __qcom_scm_pas_auth_and_reset(peripheral);
+}
+EXPORT_SYMBOL(qcom_scm_pas_auth_and_reset);
+
+/**
+ * qcom_scm_pas_shutdown() - Shut down the remote processor
+ * @peripheral: peripheral id
+ *
+ * Returns 0 on success.
+ */
+int qcom_scm_pas_shutdown(u32 peripheral)
+{
+ return __qcom_scm_pas_shutdown(peripheral);
+}
+EXPORT_SYMBOL(qcom_scm_pas_shutdown);
diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
index 2cce75c08b99..c0700590193a 100644
--- a/drivers/firmware/qcom_scm.h
+++ b/drivers/firmware/qcom_scm.h
@@ -36,6 +36,18 @@ 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);
+#define QCOM_SCM_SVC_PIL 0x2
+#define QCOM_SCM_PAS_INIT_IMAGE_CMD 0x1
+#define QCOM_SCM_PAS_MEM_SETUP_CMD 0x2
+#define QCOM_SCM_PAS_AUTH_AND_RESET_CMD 0x5
+#define QCOM_SCM_PAS_SHUTDOWN_CMD 0x6
+#define QCOM_SCM_PAS_IS_SUPPORTED_CMD 0x7
+extern bool __qcom_scm_pas_supported(u32 peripheral);
+extern int __qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size);
+extern int __qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr, phys_addr_t size);
+extern int __qcom_scm_pas_auth_and_reset(u32 peripheral);
+extern int __qcom_scm_pas_shutdown(u32 peripheral);
+
/* common error codes */
#define QCOM_SCM_ENOMEM -5
#define QCOM_SCM_EOPNOTSUPP -4
diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
index 6e7d5ec65838..46d41e44d432 100644
--- a/include/linux/qcom_scm.h
+++ b/include/linux/qcom_scm.h
@@ -27,6 +27,12 @@ extern bool qcom_scm_hdcp_available(void);
extern int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt,
u32 *resp);
+extern bool qcom_scm_pas_supported(u32 peripheral);
+extern int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size);
+extern int qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr, phys_addr_t size);
+extern int qcom_scm_pas_auth_and_reset(u32 peripheral);
+extern int qcom_scm_pas_shutdown(u32 peripheral);
+
#define QCOM_SCM_CPU_PWR_DOWN_L2_ON 0x0
#define QCOM_SCM_CPU_PWR_DOWN_L2_OFF 0x1
--
1.8.2.2
--
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