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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@sonymobile.com>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
hifive-unleashed-5.1
Bjorn Andersson 2015-09-23 12:56:12 -07:00 committed by Andy Gross
parent 3680a4a974
commit f01e90fe34
5 changed files with 334 additions and 0 deletions

View File

@ -458,3 +458,92 @@ int __qcom_scm_hdcp_req(struct device *dev, struct qcom_scm_hdcp_req *req,
void __qcom_scm_init(void)
{
}
bool __qcom_scm_pas_supported(struct device *dev, u32 peripheral)
{
__le32 out;
__le32 in;
int ret;
in = cpu_to_le32(peripheral);
ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL,
QCOM_SCM_PAS_IS_SUPPORTED_CMD,
&in, sizeof(in),
&out, sizeof(out));
return ret ? false : !!out;
}
int __qcom_scm_pas_init_image(struct device *dev, u32 peripheral,
dma_addr_t metadata_phys)
{
__le32 scm_ret;
int ret;
struct {
__le32 proc;
__le32 image_addr;
} request;
request.proc = cpu_to_le32(peripheral);
request.image_addr = cpu_to_le32(metadata_phys);
ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL,
QCOM_SCM_PAS_INIT_IMAGE_CMD,
&request, sizeof(request),
&scm_ret, sizeof(scm_ret));
return ret ? : le32_to_cpu(scm_ret);
}
int __qcom_scm_pas_mem_setup(struct device *dev, u32 peripheral,
phys_addr_t addr, phys_addr_t size)
{
__le32 scm_ret;
int ret;
struct {
__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(dev, 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(struct device *dev, u32 peripheral)
{
__le32 out;
__le32 in;
int ret;
in = cpu_to_le32(peripheral);
ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL,
QCOM_SCM_PAS_AUTH_AND_RESET_CMD,
&in, sizeof(in),
&out, sizeof(out));
return ret ? : le32_to_cpu(out);
}
int __qcom_scm_pas_shutdown(struct device *dev, u32 peripheral)
{
__le32 out;
__le32 in;
int ret;
in = cpu_to_le32(peripheral);
ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL,
QCOM_SCM_PAS_SHUTDOWN_CMD,
&in, sizeof(in),
&out, sizeof(out));
return ret ? : le32_to_cpu(out);
}

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@ -27,6 +27,13 @@
#define MAX_QCOM_SCM_ARGS 10
#define MAX_QCOM_SCM_RETS 3
enum qcom_scm_arg_types {
QCOM_SCM_VAL,
QCOM_SCM_RO,
QCOM_SCM_RW,
QCOM_SCM_BUFVAL,
};
#define QCOM_SCM_ARGS_IMPL(num, a, b, c, d, e, f, g, h, i, j, ...) (\
(((a) & 0x3) << 4) | \
(((b) & 0x3) << 6) | \
@ -253,3 +260,85 @@ void __qcom_scm_init(void)
else
qcom_smccc_convention = ARM_SMCCC_SMC_32;
}
bool __qcom_scm_pas_supported(struct device *dev, u32 peripheral)
{
int ret;
struct qcom_scm_desc desc = {0};
struct arm_smccc_res res;
desc.args[0] = peripheral;
desc.arginfo = QCOM_SCM_ARGS(1);
ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL,
QCOM_SCM_PAS_IS_SUPPORTED_CMD,
&desc, &res);
return ret ? false : !!res.a1;
}
int __qcom_scm_pas_init_image(struct device *dev, u32 peripheral,
dma_addr_t metadata_phys)
{
int ret;
struct qcom_scm_desc desc = {0};
struct arm_smccc_res res;
desc.args[0] = peripheral;
desc.args[1] = metadata_phys;
desc.arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_VAL, QCOM_SCM_RW);
ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_INIT_IMAGE_CMD,
&desc, &res);
return ret ? : res.a1;
}
int __qcom_scm_pas_mem_setup(struct device *dev, u32 peripheral,
phys_addr_t addr, phys_addr_t size)
{
int ret;
struct qcom_scm_desc desc = {0};
struct arm_smccc_res res;
desc.args[0] = peripheral;
desc.args[1] = addr;
desc.args[2] = size;
desc.arginfo = QCOM_SCM_ARGS(3);
ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_MEM_SETUP_CMD,
&desc, &res);
return ret ? : res.a1;
}
int __qcom_scm_pas_auth_and_reset(struct device *dev, u32 peripheral)
{
int ret;
struct qcom_scm_desc desc = {0};
struct arm_smccc_res res;
desc.args[0] = peripheral;
desc.arginfo = QCOM_SCM_ARGS(1);
ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL,
QCOM_SCM_PAS_AUTH_AND_RESET_CMD,
&desc, &res);
return ret ? : res.a1;
}
int __qcom_scm_pas_shutdown(struct device *dev, u32 peripheral)
{
int ret;
struct qcom_scm_desc desc = {0};
struct arm_smccc_res res;
desc.args[0] = peripheral;
desc.arginfo = QCOM_SCM_ARGS(1);
ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_SHUTDOWN_CMD,
&desc, &res);
return ret ? : res.a1;
}

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@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/cpumask.h>
#include <linux/export.h>
#include <linux/dma-mapping.h>
#include <linux/types.h>
#include <linux/qcom_scm.h>
#include <linux/of.h>
@ -149,6 +150,139 @@ int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *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(__scm->dev, QCOM_SCM_SVC_PIL,
QCOM_SCM_PAS_IS_SUPPORTED_CMD);
if (ret <= 0)
return false;
return __qcom_scm_pas_supported(__scm->dev, 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)
{
dma_addr_t mdata_phys;
void *mdata_buf;
int ret;
/*
* 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(__scm->dev, size, &mdata_phys,
GFP_KERNEL);
if (!mdata_buf) {
dev_err(__scm->dev, "Allocation of metadata buffer failed.\n");
return -ENOMEM;
}
memcpy(mdata_buf, metadata, size);
ret = qcom_scm_clk_enable();
if (ret)
goto free_metadata;
ret = __qcom_scm_pas_init_image(__scm->dev, peripheral, mdata_phys);
qcom_scm_clk_disable();
free_metadata:
dma_free_coherent(__scm->dev, size, mdata_buf, mdata_phys);
return ret;
}
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)
{
int ret;
ret = qcom_scm_clk_enable();
if (ret)
return ret;
ret = __qcom_scm_pas_mem_setup(__scm->dev, peripheral, addr, size);
qcom_scm_clk_disable();
return ret;
}
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)
{
int ret;
ret = qcom_scm_clk_enable();
if (ret)
return ret;
ret = __qcom_scm_pas_auth_and_reset(__scm->dev, peripheral);
qcom_scm_clk_disable();
return ret;
}
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)
{
int ret;
ret = qcom_scm_clk_enable();
if (ret)
return ret;
ret = __qcom_scm_pas_shutdown(__scm->dev, peripheral);
qcom_scm_clk_disable();
return ret;
}
EXPORT_SYMBOL(qcom_scm_pas_shutdown);
static int qcom_scm_probe(struct platform_device *pdev)
{
struct qcom_scm *scm;

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@ -40,6 +40,20 @@ extern int __qcom_scm_hdcp_req(struct device *dev,
extern void __qcom_scm_init(void);
#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(struct device *dev, u32 peripheral);
extern int __qcom_scm_pas_init_image(struct device *dev, u32 peripheral,
dma_addr_t metadata_phys);
extern int __qcom_scm_pas_mem_setup(struct device *dev, u32 peripheral,
phys_addr_t addr, phys_addr_t size);
extern int __qcom_scm_pas_auth_and_reset(struct device *dev, u32 peripheral);
extern int __qcom_scm_pas_shutdown(struct device *dev, u32 peripheral);
/* common error codes */
#define QCOM_SCM_V2_EBUSY -12
#define QCOM_SCM_ENOMEM -5

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@ -29,6 +29,14 @@ 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