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Subject[Patch v3 2/8] firmware: qcom: scm: Convert SCM to platform driver
Date
This patch converts the Qualcomm SCM firmware driver into a platform
driver.

Signed-off-by: Andy Gross <andy.gross@linaro.org>
---
drivers/firmware/qcom_scm.c | 163 +++++++++++++++++++++++++++++++++++++++++---
1 file changed, 154 insertions(+), 9 deletions(-)

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 45c008d..63a2bfa 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -10,19 +10,61 @@
* 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/types.h>
#include <linux/qcom_scm.h>
+#include <linux/of.h>
+#include <linux/of_platform.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
@@ -72,12 +114,17 @@ EXPORT_SYMBOL(qcom_scm_cpu_power_down);
*/
bool qcom_scm_hdcp_available(void)
{
- int ret;
+ int ret = qcom_scm_clk_enable();
+
+ if (ret)
+ return ret;

ret = __qcom_scm_is_call_available(QCOM_SCM_SVC_HDCP,
- QCOM_SCM_CMD_HDCP);
+ QCOM_SCM_CMD_HDCP);
+
+ qcom_scm_clk_disable();

- return (ret > 0) ? true : false;
+ return ret > 0 ? true : false;
}
EXPORT_SYMBOL(qcom_scm_hdcp_available);

@@ -91,6 +138,104 @@ 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);
+
+static int qcom_scm_probe(struct platform_device *pdev)
+{
+ struct qcom_scm *scm;
+ int ret;
+
+ scm = devm_kzalloc(&pdev->dev, sizeof(*scm), GFP_KERNEL);
+ if (!scm)
+ return -ENOMEM;
+
+ 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);
+ }
+
+ if (!of_device_is_compatible(pdev->dev.of_node, "qcom,scm-apq8064")) {
+ 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 */
+ ret = clk_set_rate(scm->core_clk, INT_MAX);
+ if (ret)
+ return ret;
+
+ __scm = scm;
+ __scm->dev = &pdev->dev;
+
+ return 0;
+}
+
+static const struct of_device_id qcom_scm_dt_match[] = {
+ { .compatible = "qcom,scm-a-family",},
+ { .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,
+};
+
+static int __init qcom_scm_init(void)
+{
+ struct device_node *np, *parent;
+ int ret;
+
+ np = of_find_matching_node_and_match(NULL, qcom_scm_dt_match, NULL);
+
+ if (!np)
+ return -ENODEV;
+
+ parent = of_get_next_parent(np);
+ ret = of_platform_populate(parent, qcom_scm_dt_match, NULL, NULL);
+
+ of_node_put(parent);
+
+ if (ret)
+ return ret;
+
+ return platform_driver_register(&qcom_scm_driver);
+}
+
+arch_initcall(qcom_scm_init);
+
+static void __exit qcom_scm_exit(void)
+{
+ platform_driver_unregister(&qcom_scm_driver);
+}
+module_exit(qcom_scm_exit);
+
+MODULE_DESCRIPTION("Qualcomm SCM driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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