8e49b4b902
This change set enables frequency scaling on ipq806x, which speeds-up the CPU and allows it to achieve its max frequency. These patches are cherry-picked & backported from the following location: *130-132: linux-next *133-143: LKML - https://lkml.org/lkml/2015/3/21/15 *144: derived from other qcom similar dts *145: derived from https://chromium.googlesource.com/chromiumos/third_party/kernel/+/chromeos-3.14/drivers/cpufreq/cpufreq-krait.c Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org> SVN-Revision: 45730
206 lines
6 KiB
Diff
206 lines
6 KiB
Diff
Content-Type: text/plain; charset="utf-8"
|
|
MIME-Version: 1.0
|
|
Content-Transfer-Encoding: 7bit
|
|
Subject: [v3,06/13] clk: qcom: Add HFPLL driver
|
|
From: Stephen Boyd <sboyd@codeaurora.org>
|
|
X-Patchwork-Id: 6063231
|
|
Message-Id: <1426920332-9340-7-git-send-email-sboyd@codeaurora.org>
|
|
To: Mike Turquette <mturquette@linaro.org>, Stephen Boyd <sboyd@codeaurora.org>
|
|
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 <viresh.kumar@linaro.org>, <devicetree@vger.kernel.org>
|
|
Date: Fri, 20 Mar 2015 23:45:25 -0700
|
|
|
|
On some devices (MSM8974 for example), the HFPLLs are
|
|
instantiated within the Krait processor subsystem as separate
|
|
register regions. Add a driver for these PLLs so that we can
|
|
provide HFPLL clocks for use by the system.
|
|
|
|
Cc: <devicetree@vger.kernel.org>
|
|
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
|
|
|
|
---
|
|
.../devicetree/bindings/clock/qcom,hfpll.txt | 40 ++++++++
|
|
drivers/clk/qcom/Kconfig | 8 ++
|
|
drivers/clk/qcom/Makefile | 1 +
|
|
drivers/clk/qcom/hfpll.c | 109 +++++++++++++++++++++
|
|
4 files changed, 158 insertions(+)
|
|
create mode 100644 Documentation/devicetree/bindings/clock/qcom,hfpll.txt
|
|
create mode 100644 drivers/clk/qcom/hfpll.c
|
|
|
|
--- /dev/null
|
|
+++ b/Documentation/devicetree/bindings/clock/qcom,hfpll.txt
|
|
@@ -0,0 +1,40 @@
|
|
+High-Frequency PLL (HFPLL)
|
|
+
|
|
+PROPERTIES
|
|
+
|
|
+- compatible:
|
|
+ Usage: required
|
|
+ Value type: <string>
|
|
+ Definition: must be "qcom,hfpll"
|
|
+
|
|
+- reg:
|
|
+ Usage: required
|
|
+ Value type: <prop-encoded-array>
|
|
+ Definition: address and size of HPLL registers. An optional second
|
|
+ element specifies the address and size of the alias
|
|
+ register region.
|
|
+
|
|
+- clock-output-names:
|
|
+ Usage: required
|
|
+ Value type: <string>
|
|
+ Definition: Name of the PLL. Typically hfpllX where X is a CPU number
|
|
+ starting at 0. Otherwise hfpll_Y where Y is more specific
|
|
+ such as "l2".
|
|
+
|
|
+Example:
|
|
+
|
|
+1) An HFPLL for the L2 cache.
|
|
+
|
|
+ clock-controller@f9016000 {
|
|
+ compatible = "qcom,hfpll";
|
|
+ reg = <0xf9016000 0x30>;
|
|
+ clock-output-names = "hfpll_l2";
|
|
+ };
|
|
+
|
|
+2) An HFPLL for CPU0. This HFPLL has the alias register region.
|
|
+
|
|
+ clock-controller@f908a000 {
|
|
+ compatible = "qcom,hfpll";
|
|
+ reg = <0xf908a000 0x30>, <0xf900a000 0x30>;
|
|
+ clock-output-names = "hfpll0";
|
|
+ };
|
|
--- a/drivers/clk/qcom/Kconfig
|
|
+++ b/drivers/clk/qcom/Kconfig
|
|
@@ -88,3 +88,11 @@ config MSM_MMCC_8974
|
|
Support for the multimedia clock controller on msm8974 devices.
|
|
Say Y if you want to support multimedia devices such as display,
|
|
graphics, video encode/decode, camera, etc.
|
|
+
|
|
+config QCOM_HFPLL
|
|
+ tristate "High-Frequency PLL (HFPLL) Clock Controller"
|
|
+ depends on COMMON_CLK_QCOM
|
|
+ help
|
|
+ Support for the high-frequency PLLs present on Qualcomm devices.
|
|
+ Say Y if you want to support CPU frequency scaling on devices
|
|
+ such as MSM8974, APQ8084, etc.
|
|
--- a/drivers/clk/qcom/Makefile
|
|
+++ b/drivers/clk/qcom/Makefile
|
|
@@ -21,3 +21,4 @@ obj-$(CONFIG_MSM_LCC_8960) += lcc-msm896
|
|
obj-$(CONFIG_MSM_GCC_8974) += gcc-msm8974.o
|
|
obj-$(CONFIG_MSM_MMCC_8960) += mmcc-msm8960.o
|
|
obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8974.o
|
|
+obj-$(CONFIG_QCOM_HFPLL) += hfpll.o
|
|
--- /dev/null
|
|
+++ b/drivers/clk/qcom/hfpll.c
|
|
@@ -0,0 +1,109 @@
|
|
+/*
|
|
+ * Copyright (c) 2013-2014, 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/of.h>
|
|
+#include <linux/clk.h>
|
|
+#include <linux/clk-provider.h>
|
|
+#include <linux/regmap.h>
|
|
+
|
|
+#include "clk-regmap.h"
|
|
+#include "clk-hfpll.h"
|
|
+
|
|
+static const struct hfpll_data hdata = {
|
|
+ .mode_reg = 0x00,
|
|
+ .l_reg = 0x04,
|
|
+ .m_reg = 0x08,
|
|
+ .n_reg = 0x0c,
|
|
+ .user_reg = 0x10,
|
|
+ .config_reg = 0x14,
|
|
+ .config_val = 0x430405d,
|
|
+ .status_reg = 0x1c,
|
|
+ .lock_bit = 16,
|
|
+
|
|
+ .user_val = 0x8,
|
|
+ .user_vco_mask = 0x100000,
|
|
+ .low_vco_max_rate = 1248000000,
|
|
+ .min_rate = 537600000UL,
|
|
+ .max_rate = 2900000000UL,
|
|
+};
|
|
+
|
|
+static const struct of_device_id qcom_hfpll_match_table[] = {
|
|
+ { .compatible = "qcom,hfpll" },
|
|
+ { }
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, qcom_hfpll_match_table);
|
|
+
|
|
+static const struct regmap_config hfpll_regmap_config = {
|
|
+ .reg_bits = 32,
|
|
+ .reg_stride = 4,
|
|
+ .val_bits = 32,
|
|
+ .max_register = 0x30,
|
|
+ .fast_io = true,
|
|
+};
|
|
+
|
|
+static int qcom_hfpll_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct clk *clk;
|
|
+ struct resource *res;
|
|
+ struct device *dev = &pdev->dev;
|
|
+ void __iomem *base;
|
|
+ struct regmap *regmap;
|
|
+ struct clk_hfpll *h;
|
|
+ struct clk_init_data init = {
|
|
+ .parent_names = (const char *[]){ "xo" },
|
|
+ .num_parents = 1,
|
|
+ .ops = &clk_ops_hfpll,
|
|
+ };
|
|
+
|
|
+ h = devm_kzalloc(dev, sizeof(*h), GFP_KERNEL);
|
|
+ if (!h)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ base = devm_ioremap_resource(dev, res);
|
|
+ if (IS_ERR(base))
|
|
+ return PTR_ERR(base);
|
|
+
|
|
+ regmap = devm_regmap_init_mmio(&pdev->dev, base, &hfpll_regmap_config);
|
|
+ if (IS_ERR(regmap))
|
|
+ return PTR_ERR(regmap);
|
|
+
|
|
+ if (of_property_read_string_index(dev->of_node, "clock-output-names",
|
|
+ 0, &init.name))
|
|
+ return -ENODEV;
|
|
+
|
|
+ h->d = &hdata;
|
|
+ h->clkr.hw.init = &init;
|
|
+ spin_lock_init(&h->lock);
|
|
+
|
|
+ clk = devm_clk_register_regmap(&pdev->dev, &h->clkr);
|
|
+
|
|
+ return PTR_ERR_OR_ZERO(clk);
|
|
+}
|
|
+
|
|
+static struct platform_driver qcom_hfpll_driver = {
|
|
+ .probe = qcom_hfpll_probe,
|
|
+ .driver = {
|
|
+ .name = "qcom-hfpll",
|
|
+ .of_match_table = qcom_hfpll_match_table,
|
|
+ },
|
|
+};
|
|
+module_platform_driver(qcom_hfpll_driver);
|
|
+
|
|
+MODULE_DESCRIPTION("QCOM HFPLL Clock Driver");
|
|
+MODULE_LICENSE("GPL v2");
|
|
+MODULE_ALIAS("platform:qcom-hfpll");
|