clk: qcom: Add A53 PLL support

The CPUs on Qualcomm MSM8916-based platforms are clocked by two PLLs,
a primary (A53) CPU PLL and a secondary fixed-rate GPLL0. These sources
are connected to a mux and half-integer divider, which is feeding the
CPU cores.

This patch adds support for the primary CPU PLL which generates the
higher range of frequencies above 1GHz.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Amit Kucheria <amit.kucheria@linaro.org>
[sboyd@codeaurora.org: Move to devm provider registration,
NUL terminate frequency table, made tristate/modular]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Georgi Djakov 2017-12-05 17:46:58 +02:00 committed by Stephen Boyd
parent 4fbd8d194f
commit 0c6ab1b8f8
4 changed files with 140 additions and 0 deletions

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@ -0,0 +1,22 @@
Qualcomm MSM8916 A53 PLL Binding
--------------------------------
The A53 PLL on MSM8916 platforms is the main CPU PLL used used for frequencies
above 1GHz.
Required properties :
- compatible : Shall contain only one of the following:
"qcom,msm8916-a53pll"
- reg : shall contain base register location and length
- #clock-cells : must be set to <0>
Example:
a53pll: clock@b016000 {
compatible = "qcom,msm8916-a53pll";
reg = <0xb016000 0x40>;
#clock-cells = <0>;
};

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@ -12,6 +12,16 @@ config COMMON_CLK_QCOM
select REGMAP_MMIO
select RESET_CONTROLLER
config QCOM_A53PLL
tristate "MSM8916 A53 PLL"
depends on COMMON_CLK_QCOM
default ARCH_QCOM
help
Support for the A53 PLL on MSM8916 devices. It provides
the CPU with frequencies above 1GHz.
Say Y if you want to support higher CPU frequencies on MSM8916
devices.
config QCOM_CLK_RPM
tristate "RPM based Clock Controller"
depends on COMMON_CLK_QCOM && MFD_QCOM_RPM

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@ -32,5 +32,6 @@ obj-$(CONFIG_MSM_LCC_8960) += lcc-msm8960.o
obj-$(CONFIG_MSM_MMCC_8960) += mmcc-msm8960.o
obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8974.o
obj-$(CONFIG_MSM_MMCC_8996) += mmcc-msm8996.o
obj-$(CONFIG_QCOM_A53PLL) += a53-pll.o
obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.o
obj-$(CONFIG_QCOM_CLK_SMD_RPM) += clk-smd-rpm.o

107
drivers/clk/qcom/a53-pll.c Normal file
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@ -0,0 +1,107 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Qualcomm A53 PLL driver
*
* Copyright (c) 2017, Linaro Limited
* Author: Georgi Djakov <georgi.djakov@linaro.org>
*/
#include <linux/clk-provider.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/module.h>
#include "clk-pll.h"
#include "clk-regmap.h"
static const struct pll_freq_tbl a53pll_freq[] = {
{ 998400000, 52, 0x0, 0x1, 0 },
{ 1094400000, 57, 0x0, 0x1, 0 },
{ 1152000000, 62, 0x0, 0x1, 0 },
{ 1209600000, 63, 0x0, 0x1, 0 },
{ 1248000000, 65, 0x0, 0x1, 0 },
{ 1363200000, 71, 0x0, 0x1, 0 },
{ 1401600000, 73, 0x0, 0x1, 0 },
{ }
};
static const struct regmap_config a53pll_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = 0x40,
.fast_io = true,
};
static int qcom_a53pll_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct regmap *regmap;
struct resource *res;
struct clk_pll *pll;
void __iomem *base;
struct clk_init_data init = { };
int ret;
pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
if (!pll)
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(dev, base, &a53pll_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
pll->l_reg = 0x04;
pll->m_reg = 0x08;
pll->n_reg = 0x0c;
pll->config_reg = 0x14;
pll->mode_reg = 0x00;
pll->status_reg = 0x1c;
pll->status_bit = 16;
pll->freq_tbl = a53pll_freq;
init.name = "a53pll";
init.parent_names = (const char *[]){ "xo" };
init.num_parents = 1;
init.ops = &clk_pll_sr2_ops;
init.flags = CLK_IS_CRITICAL;
pll->clkr.hw.init = &init;
ret = devm_clk_register_regmap(dev, &pll->clkr);
if (ret) {
dev_err(dev, "failed to register regmap clock: %d\n", ret);
return ret;
}
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
&pll->clkr.hw);
if (ret) {
dev_err(dev, "failed to add clock provider: %d\n", ret);
return ret;
}
return 0;
}
static const struct of_device_id qcom_a53pll_match_table[] = {
{ .compatible = "qcom,msm8916-a53pll" },
{ }
};
static struct platform_driver qcom_a53pll_driver = {
.probe = qcom_a53pll_probe,
.driver = {
.name = "qcom-a53pll",
.of_match_table = qcom_a53pll_match_table,
},
};
module_platform_driver(qcom_a53pll_driver);
MODULE_DESCRIPTION("Qualcomm A53 PLL Driver");
MODULE_LICENSE("GPL v2");