You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
197 lines
5.7 KiB
Diff
197 lines
5.7 KiB
Diff
From 6039eb63fabdd6871fc70940aa98102665c78eed Mon Sep 17 00:00:00 2001
|
|
From: Stephen Boyd <sboyd@codeaurora.org>
|
|
Date: Fri, 20 Mar 2015 23:45:29 -0700
|
|
Subject: [PATCH 42/69] clk: qcom: Add KPSS ACC/GCC driver
|
|
|
|
The ACC and GCC regions present in KPSSv1 contain registers to
|
|
control clocks and power to each Krait CPU and L2. For CPUfreq
|
|
purposes probe these devices and expose a mux clock that chooses
|
|
between PXO and PLL8.
|
|
|
|
Cc: <devicetree@vger.kernel.org>
|
|
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
|
|
---
|
|
.../devicetree/bindings/arm/msm/qcom,kpss-acc.txt | 7 ++
|
|
.../devicetree/bindings/arm/msm/qcom,kpss-gcc.txt | 28 +++++++
|
|
drivers/clk/qcom/Kconfig | 8 ++
|
|
drivers/clk/qcom/Makefile | 1 +
|
|
drivers/clk/qcom/kpss-xcc.c | 95 ++++++++++++++++++++++
|
|
5 files changed, 139 insertions(+)
|
|
create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
|
|
create mode 100644 drivers/clk/qcom/kpss-xcc.c
|
|
|
|
--- a/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
|
|
+++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
|
|
@@ -21,10 +21,17 @@ PROPERTIES
|
|
the register region. An optional second element specifies
|
|
the base address and size of the alias register region.
|
|
|
|
+- clock-output-names:
|
|
+ Usage: optional
|
|
+ Value type: <string>
|
|
+ Definition: Name of the output clock. Typically acpuX_aux where X is a
|
|
+ CPU number starting at 0.
|
|
+
|
|
Example:
|
|
|
|
clock-controller@2088000 {
|
|
compatible = "qcom,kpss-acc-v2";
|
|
reg = <0x02088000 0x1000>,
|
|
<0x02008000 0x1000>;
|
|
+ clock-output-names = "acpu0_aux";
|
|
};
|
|
--- /dev/null
|
|
+++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
|
|
@@ -0,0 +1,28 @@
|
|
+Krait Processor Sub-system (KPSS) Global Clock Controller (GCC)
|
|
+
|
|
+PROPERTIES
|
|
+
|
|
+- compatible:
|
|
+ Usage: required
|
|
+ Value type: <string>
|
|
+ Definition: should be one of:
|
|
+ "qcom,kpss-gcc"
|
|
+
|
|
+- reg:
|
|
+ Usage: required
|
|
+ Value type: <prop-encoded-array>
|
|
+ Definition: base address and size of the register region
|
|
+
|
|
+- clock-output-names:
|
|
+ Usage: required
|
|
+ Value type: <string>
|
|
+ Definition: Name of the output clock. Typically acpu_l2_aux indicating
|
|
+ an L2 cache auxiliary clock.
|
|
+
|
|
+Example:
|
|
+
|
|
+ l2cc: clock-controller@2011000 {
|
|
+ compatible = "qcom,kpss-gcc";
|
|
+ reg = <0x2011000 0x1000>;
|
|
+ clock-output-names = "acpu_l2_aux";
|
|
+ };
|
|
--- a/drivers/clk/qcom/Kconfig
|
|
+++ b/drivers/clk/qcom/Kconfig
|
|
@@ -188,6 +188,14 @@ config QCOM_HFPLL
|
|
Say Y if you want to support CPU frequency scaling on devices
|
|
such as MSM8974, APQ8084, etc.
|
|
|
|
+config KPSS_XCC
|
|
+ tristate "KPSS Clock Controller"
|
|
+ depends on COMMON_CLK_QCOM
|
|
+ help
|
|
+ Support for the Krait ACC and GCC clock controllers. Say Y
|
|
+ if you want to support CPU frequency scaling on devices such
|
|
+ as MSM8960, APQ8064, etc.
|
|
+
|
|
config KRAIT_CLOCKS
|
|
bool
|
|
select KRAIT_L2_ACCESSORS
|
|
--- a/drivers/clk/qcom/Makefile
|
|
+++ b/drivers/clk/qcom/Makefile
|
|
@@ -33,4 +33,5 @@ obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8
|
|
obj-$(CONFIG_MSM_MMCC_8996) += mmcc-msm8996.o
|
|
obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.o
|
|
obj-$(CONFIG_QCOM_CLK_SMD_RPM) += clk-smd-rpm.o
|
|
+obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o
|
|
obj-$(CONFIG_QCOM_HFPLL) += hfpll.o
|
|
--- /dev/null
|
|
+++ b/drivers/clk/qcom/kpss-xcc.c
|
|
@@ -0,0 +1,95 @@
|
|
+/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
|
|
+ *
|
|
+ * This program is free software; you can redistribute it and/or modify
|
|
+ * it under the terms of the GNU General Public License version 2 and
|
|
+ * only version 2 as published by the Free Software Foundation.
|
|
+ *
|
|
+ * This program is distributed in the hope that it will be useful,
|
|
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
+ * GNU General Public License for more details.
|
|
+ */
|
|
+
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/init.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/platform_device.h>
|
|
+#include <linux/err.h>
|
|
+#include <linux/io.h>
|
|
+#include <linux/of.h>
|
|
+#include <linux/of_device.h>
|
|
+#include <linux/clk.h>
|
|
+#include <linux/clk-provider.h>
|
|
+
|
|
+static const char *aux_parents[] = {
|
|
+ "pll8_vote",
|
|
+ "pxo",
|
|
+};
|
|
+
|
|
+static unsigned int aux_parent_map[] = {
|
|
+ 3,
|
|
+ 0,
|
|
+};
|
|
+
|
|
+static const struct of_device_id kpss_xcc_match_table[] = {
|
|
+ { .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL },
|
|
+ { .compatible = "qcom,kpss-gcc" },
|
|
+ {}
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
|
|
+
|
|
+static int kpss_xcc_driver_probe(struct platform_device *pdev)
|
|
+{
|
|
+ const struct of_device_id *id;
|
|
+ struct clk *clk;
|
|
+ struct resource *res;
|
|
+ void __iomem *base;
|
|
+ const char *name;
|
|
+
|
|
+ id = of_match_device(kpss_xcc_match_table, &pdev->dev);
|
|
+ if (!id)
|
|
+ return -ENODEV;
|
|
+
|
|
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ base = devm_ioremap_resource(&pdev->dev, res);
|
|
+ if (IS_ERR(base))
|
|
+ return PTR_ERR(base);
|
|
+
|
|
+ if (id->data) {
|
|
+ if (of_property_read_string_index(pdev->dev.of_node,
|
|
+ "clock-output-names", 0, &name))
|
|
+ return -ENODEV;
|
|
+ base += 0x14;
|
|
+ } else {
|
|
+ name = "acpu_l2_aux";
|
|
+ base += 0x28;
|
|
+ }
|
|
+
|
|
+ clk = clk_register_mux_table(&pdev->dev, name, aux_parents,
|
|
+ ARRAY_SIZE(aux_parents), 0, base, 0, 0x3,
|
|
+ 0, aux_parent_map, NULL);
|
|
+
|
|
+ platform_set_drvdata(pdev, clk);
|
|
+
|
|
+ return PTR_ERR_OR_ZERO(clk);
|
|
+}
|
|
+
|
|
+static int kpss_xcc_driver_remove(struct platform_device *pdev)
|
|
+{
|
|
+ clk_unregister_mux(platform_get_drvdata(pdev));
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct platform_driver kpss_xcc_driver = {
|
|
+ .probe = kpss_xcc_driver_probe,
|
|
+ .remove = kpss_xcc_driver_remove,
|
|
+ .driver = {
|
|
+ .name = "kpss-xcc",
|
|
+ .of_match_table = kpss_xcc_match_table,
|
|
+ },
|
|
+};
|
|
+module_platform_driver(kpss_xcc_driver);
|
|
+
|
|
+MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
|
|
+MODULE_LICENSE("GPL v2");
|
|
+MODULE_ALIAS("platform:kpss-xcc");
|