* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
*/
-
+#include <linux/platform_device.h>
+#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>
+#include <linux/clk.h>
#include "qcom_scm.h"
+struct qcom_scm {
+ struct device *dev;
+ struct clk *core_clk;
+ struct clk *iface_clk;
+ struct clk *bus_clk;
+};
+
+static struct qcom_scm *__scm;
+
+static int qcom_scm_clk_enable(void)
+{
+ int ret;
+
+ ret = clk_prepare_enable(__scm->core_clk);
+ if (ret)
+ goto bail;
+ ret = clk_prepare_enable(__scm->iface_clk);
+ if (ret)
+ goto disable_core;
+ ret = clk_prepare_enable(__scm->bus_clk);
+ if (ret)
+ goto disable_iface;
+
+ return 0;
+
+disable_iface:
+ clk_disable_unprepare(__scm->iface_clk);
+disable_core:
+ clk_disable_unprepare(__scm->core_clk);
+bail:
+ return ret;
+}
+
+static void qcom_scm_clk_disable(void)
+{
+ clk_disable_unprepare(__scm->core_clk);
+ clk_disable_unprepare(__scm->iface_clk);
+ clk_disable_unprepare(__scm->bus_clk);
+}
+
/**
* qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus
* @entry: Entry point function for the cpus
*/
bool qcom_scm_hdcp_available(void)
{
- int ret;
+ int ret = qcom_scm_clk_enable();
+
+ if (ret)
+ goto clk_err;
ret = __qcom_scm_is_call_available(QCOM_SCM_SVC_HDCP,
- QCOM_SCM_CMD_HDCP);
+ QCOM_SCM_CMD_HDCP);
+ qcom_scm_clk_disable();
+
+clk_err:
return (ret > 0) ? true : false;
}
EXPORT_SYMBOL(qcom_scm_hdcp_available);
*/
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);
+ int ret = qcom_scm_clk_enable();
+
+ if (ret)
+ return ret;
+
+ ret = __qcom_scm_hdcp_req(req, req_cnt, resp);
+ qcom_scm_clk_disable();
+ return ret;
}
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)
+{
+ 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(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(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(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(peripheral);
+ qcom_scm_clk_disable();
+
+ return ret;
+}
+EXPORT_SYMBOL(qcom_scm_pas_shutdown);
+
+/**
+ * qcom_scm_is_available() - Checks if SCM is available
+ */
+bool qcom_scm_is_available(void)
+{
+ return !!__scm;
+}
+EXPORT_SYMBOL(qcom_scm_is_available);
+
+static int qcom_scm_probe(struct platform_device *pdev)
+{
+ struct qcom_scm *scm;
+ long rate;
+ int ret;
+
+ scm = devm_kzalloc(&pdev->dev, sizeof(*scm), GFP_KERNEL);
+ if (!scm)
+ return -ENOMEM;
+
+ scm->dev = &pdev->dev;
+
+ scm->core_clk = devm_clk_get(&pdev->dev, "core");
+ if (IS_ERR(scm->core_clk)) {
+ if (PTR_ERR(scm->core_clk) != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "failed to acquire core clk\n");
+ return PTR_ERR(scm->core_clk);
+ }
+
+ scm->iface_clk = devm_clk_get(&pdev->dev, "iface");
+ if (IS_ERR(scm->iface_clk)) {
+ if (PTR_ERR(scm->iface_clk) != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "failed to acquire iface clk\n");
+ return PTR_ERR(scm->iface_clk);
+ }
+
+ scm->bus_clk = devm_clk_get(&pdev->dev, "bus");
+ if (IS_ERR(scm->bus_clk)) {
+ if (PTR_ERR(scm->bus_clk) != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "failed to acquire bus clk\n");
+ return PTR_ERR(scm->bus_clk);
+ }
+
+ /* vote for max clk rate for highest performance */
+ rate = clk_round_rate(scm->core_clk, INT_MAX);
+ ret = clk_set_rate(scm->core_clk, rate);
+ if (ret)
+ return ret;
+
+ __scm = scm;
+
+ return 0;
+}
+
+static const struct of_device_id qcom_scm_dt_match[] = {
+ { .compatible = "qcom,scm",},
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, qcom_scm_dt_match);
+
+static struct platform_driver qcom_scm_driver = {
+ .driver = {
+ .name = "qcom_scm",
+ .of_match_table = qcom_scm_dt_match,
+ },
+ .probe = qcom_scm_probe,
+};
+
+builtin_platform_driver(qcom_scm_driver);
projects / karo-tx-linux.git / blobdiff