Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [v3,10/13] clk: qcom: Add KPSS ACC/GCC driver From: Stephen Boyd X-Patchwork-Id: 6063201 Message-Id: <1426920332-9340-11-git-send-email-sboyd@codeaurora.org> To: Mike Turquette , Stephen Boyd Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Viresh Kumar , Date: Fri, 20 Mar 2015 23:45:29 -0700 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: Signed-off-by: Stephen Boyd --- .../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: + 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: + Definition: should be one of: + "qcom,kpss-gcc" + +- reg: + Usage: required + Value type: + Definition: base address and size of the register region + +- clock-output-names: + Usage: required + Value type: + 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 @@ -144,6 +144,14 @@ 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 @@ -9,6 +9,7 @@ clk-qcom-y += clk-branch.o clk-qcom-y += clk-regmap-divider.o clk-qcom-y += clk-regmap-mux.o clk-qcom-$(CONFIG_KRAIT_CLOCKS) += clk-krait.o +obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o clk-qcom-y += clk-hfpll.o clk-qcom-y += reset.o clk-qcom-$(CONFIG_QCOM_GDSC) += gdsc.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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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");