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210 lines
6.2 KiB
Diff
210 lines
6.2 KiB
Diff
From patchwork Fri Dec 8 09:42:26 2017
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Subject: [v4,08/12] clk: qcom: Add KPSS ACC/GCC driver
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From: Sricharan R <sricharan@codeaurora.org>
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X-Patchwork-Id: 10102023
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Message-Id: <1512726150-7204-9-git-send-email-sricharan@codeaurora.org>
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To: mturquette@baylibre.com, sboyd@codeaurora.org,
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devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
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linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
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viresh.kumar@linaro.org, linux-arm-kernel@lists.infradead.org
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Cc: sricharan@codeaurora.org
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Date: Fri, 8 Dec 2017 15:12:26 +0530
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From: Stephen Boyd <sboyd@codeaurora.org>
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The ACC and GCC regions present in KPSSv1 contain registers to
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control clocks and power to each Krait CPU and L2. For CPUfreq
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purposes probe these devices and expose a mux clock that chooses
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between PXO and PLL8.
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Cc: <devicetree@vger.kernel.org>
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Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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---
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.../devicetree/bindings/arm/msm/qcom,kpss-acc.txt | 7 ++
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.../devicetree/bindings/arm/msm/qcom,kpss-gcc.txt | 28 +++++++
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drivers/clk/qcom/Kconfig | 8 ++
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drivers/clk/qcom/Makefile | 1 +
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drivers/clk/qcom/kpss-xcc.c | 96 ++++++++++++++++++++++
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5 files changed, 140 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
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create mode 100644 drivers/clk/qcom/kpss-xcc.c
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--- a/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
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+++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
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@@ -21,10 +21,17 @@ PROPERTIES
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the register region. An optional second element specifies
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the base address and size of the alias register region.
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+- clock-output-names:
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+ Usage: optional
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+ Value type: <string>
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+ Definition: Name of the output clock. Typically acpuX_aux where X is a
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+ CPU number starting at 0.
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+
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Example:
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clock-controller@2088000 {
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compatible = "qcom,kpss-acc-v2";
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reg = <0x02088000 0x1000>,
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<0x02008000 0x1000>;
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+ clock-output-names = "acpu0_aux";
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};
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
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@@ -0,0 +1,28 @@
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+Krait Processor Sub-system (KPSS) Global Clock Controller (GCC)
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+
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+PROPERTIES
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+
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+- compatible:
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+ Usage: required
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+ Value type: <string>
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+ Definition: should be one of:
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+ "qcom,kpss-gcc"
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+
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+- reg:
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+ Usage: required
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+ Value type: <prop-encoded-array>
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+ Definition: base address and size of the register region
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+
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+- clock-output-names:
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+ Usage: required
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+ Value type: <string>
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+ Definition: Name of the output clock. Typically acpu_l2_aux indicating
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+ an L2 cache auxiliary clock.
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+
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+Example:
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+
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+ l2cc: clock-controller@2011000 {
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+ compatible = "qcom,kpss-gcc";
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+ reg = <0x2011000 0x1000>;
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+ clock-output-names = "acpu_l2_aux";
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+ };
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--- a/drivers/clk/qcom/Kconfig
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+++ b/drivers/clk/qcom/Kconfig
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@@ -205,6 +205,14 @@ config QCOM_HFPLL
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Say Y if you want to support CPU frequency scaling on devices
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such as MSM8974, APQ8084, etc.
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+config KPSS_XCC
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+ tristate "KPSS Clock Controller"
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+ depends on COMMON_CLK_QCOM
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+ help
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+ Support for the Krait ACC and GCC clock controllers. Say Y
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+ if you want to support CPU frequency scaling on devices such
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+ as MSM8960, APQ8064, etc.
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+
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config KRAIT_CLOCKS
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bool
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select KRAIT_L2_ACCESSORS
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--- a/drivers/clk/qcom/Makefile
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+++ b/drivers/clk/qcom/Makefile
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@@ -36,4 +36,5 @@ obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8
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obj-$(CONFIG_MSM_MMCC_8996) += mmcc-msm8996.o
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obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.o
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obj-$(CONFIG_QCOM_CLK_SMD_RPM) += clk-smd-rpm.o
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+obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o
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obj-$(CONFIG_QCOM_HFPLL) += hfpll.o
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--- /dev/null
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+++ b/drivers/clk/qcom/kpss-xcc.c
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@@ -0,0 +1,96 @@
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+/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 and
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+ * only version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/err.h>
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+#include <linux/io.h>
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+#include <linux/of.h>
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+#include <linux/of_device.h>
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+#include <linux/clk.h>
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+#include <linux/clk-provider.h>
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+
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+static const char *aux_parents[] = {
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+ "pll8_vote",
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+ "pxo",
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+};
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+
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+static unsigned int aux_parent_map[] = {
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+ 3,
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+ 0,
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+};
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+
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+static const struct of_device_id kpss_xcc_match_table[] = {
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+ { .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL },
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+ { .compatible = "qcom,kpss-gcc" },
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+ {}
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+};
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+MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
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+
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+static int kpss_xcc_driver_probe(struct platform_device *pdev)
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+{
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+ const struct of_device_id *id;
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+ struct clk *clk;
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+ struct resource *res;
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+ void __iomem *base;
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+ const char *name;
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+
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+ id = of_match_device(kpss_xcc_match_table, &pdev->dev);
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+ if (!id)
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+ return -ENODEV;
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ base = devm_ioremap_resource(&pdev->dev, res);
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+ if (IS_ERR(base))
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+ return PTR_ERR(base);
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+
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+ if (id->data) {
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+ if (of_property_read_string_index(pdev->dev.of_node,
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+ "clock-output-names",
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+ 0, &name))
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+ return -ENODEV;
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+ base += 0x14;
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+ } else {
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+ name = "acpu_l2_aux";
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+ base += 0x28;
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+ }
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+
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+ clk = clk_register_mux_table(&pdev->dev, name, aux_parents,
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+ ARRAY_SIZE(aux_parents), 0, base, 0, 0x3,
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+ 0, aux_parent_map, NULL);
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+
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+ platform_set_drvdata(pdev, clk);
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+
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+ return PTR_ERR_OR_ZERO(clk);
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+}
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+
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+static int kpss_xcc_driver_remove(struct platform_device *pdev)
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+{
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+ clk_unregister_mux(platform_get_drvdata(pdev));
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+ return 0;
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+}
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+
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+static struct platform_driver kpss_xcc_driver = {
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+ .probe = kpss_xcc_driver_probe,
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+ .remove = kpss_xcc_driver_remove,
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+ .driver = {
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+ .name = "kpss-xcc",
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+ .of_match_table = kpss_xcc_match_table,
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+ },
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+};
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+module_platform_driver(kpss_xcc_driver);
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+
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+MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
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+MODULE_LICENSE("GPL v2");
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+MODULE_ALIAS("platform:kpss-xcc");
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