clk: hisilicon: Add support for Hi3660 stub clocks (4f16f7ff) · Commits · 戴 / test

drivers/clk/hisilicon/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -49,3 +49,9 @@ config STUB_CLK_HI6220
		default ARCH_HISI
		help
		Build the Hisilicon Hi6220 stub clock driver.

		config STUB_CLK_HI3660
		bool "Hi3660 Stub Clock Driver"
		depends on COMMON_CLK_HI3660 && MAILBOX
		help
		Build the Hisilicon Hi3660 stub clock driver.

drivers/clk/hisilicon/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -15,3 +15,4 @@ obj-$(CONFIG_COMMON_CLK_HI3798CV200) += crg-hi3798cv200.o
		obj-$(CONFIG_COMMON_CLK_HI6220) += clk-hi6220.o
		obj-$(CONFIG_RESET_HISI) += reset.o
		obj-$(CONFIG_STUB_CLK_HI6220) += clk-hi6220-stub.o
		obj-$(CONFIG_STUB_CLK_HI3660) += clk-hi3660-stub.o

drivers/clk/hisilicon/clk-hi3660-stub.c

0 → 100644

+185 −0

Original line number	Diff line number	Diff line
		/*
		* Hisilicon clock driver
		*
		* Copyright (c) 2013-2017 Hisilicon Limited.
		* Copyright (c) 2017 Linaro Limited.
		*
		* Author: Kai Zhao <zhaokai1@hisilicon.com>
		* Tao Wang <kevin.wangtao@hisilicon.com>
		* Leo Yan <leo.yan@linaro.org>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* 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/clk-provider.h>
		#include <linux/device.h>
		#include <linux/err.h>
		#include <linux/init.h>
		#include <linux/mailbox_client.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/platform_device.h>
		#include <dt-bindings/clock/hi3660-clock.h>

		#define HI3660_STUB_CLOCK_DATA (0x70)
		#define MHZ (1000 * 1000)

		#define DEFINE_CLK_STUB(_id, _cmd, _name) \
		{ \
		.id = (_id), \
		.cmd = (_cmd), \
		.hw.init = &(struct clk_init_data) { \
		.name = #_name, \
		.ops = &hi3660_stub_clk_ops, \
		.num_parents = 0, \
		.flags = CLK_GET_RATE_NOCACHE, \
		}, \
		},

		#define to_stub_clk(_hw) container_of(_hw, struct hi3660_stub_clk, hw)

		struct hi3660_stub_clk_chan {
		struct mbox_client cl;
		struct mbox_chan *mbox;
		};

		struct hi3660_stub_clk {
		unsigned int id;
		struct clk_hw hw;
		unsigned int cmd;
		unsigned int msg[8];
		unsigned int rate;
		};

		static void __iomem *freq_reg;
		static struct hi3660_stub_clk_chan stub_clk_chan;

		static unsigned long hi3660_stub_clk_recalc_rate(struct clk_hw *hw,
		unsigned long parent_rate)
		{
		struct hi3660_stub_clk *stub_clk = to_stub_clk(hw);

		/*
		* LPM3 writes back the CPU frequency in shared SRAM so read
		* back the frequency.
		*/
		stub_clk->rate = readl(freq_reg + (stub_clk->id << 2)) * MHZ;
		return stub_clk->rate;
		}

		static long hi3660_stub_clk_round_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long *prate)
		{
		/*
		* LPM3 handles rate rounding so just return whatever
		* rate is requested.
		*/
		return rate;
		}

		static int hi3660_stub_clk_set_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long parent_rate)
		{
		struct hi3660_stub_clk *stub_clk = to_stub_clk(hw);

		stub_clk->msg[0] = stub_clk->cmd;
		stub_clk->msg[1] = rate / MHZ;

		dev_dbg(stub_clk_chan.cl.dev, "set rate msg[0]=0x%x msg[1]=0x%x\n",
		stub_clk->msg[0], stub_clk->msg[1]);

		mbox_send_message(stub_clk_chan.mbox, stub_clk->msg);
		mbox_client_txdone(stub_clk_chan.mbox, 0);

		stub_clk->rate = rate;
		return 0;
		}

		static const struct clk_ops hi3660_stub_clk_ops = {
		.recalc_rate = hi3660_stub_clk_recalc_rate,
		.round_rate = hi3660_stub_clk_round_rate,
		.set_rate = hi3660_stub_clk_set_rate,
		};

		static struct hi3660_stub_clk hi3660_stub_clks[HI3660_CLK_STUB_NUM] = {
		DEFINE_CLK_STUB(HI3660_CLK_STUB_CLUSTER0, 0x0001030A, "cpu-cluster.0")
		DEFINE_CLK_STUB(HI3660_CLK_STUB_CLUSTER1, 0x0002030A, "cpu-cluster.1")
		DEFINE_CLK_STUB(HI3660_CLK_STUB_GPU, 0x0003030A, "clk-g3d")
		DEFINE_CLK_STUB(HI3660_CLK_STUB_DDR, 0x00040309, "clk-ddrc")
		};

		static struct clk_hw hi3660_stub_clk_hw_get(struct of_phandle_args clkspec,
		void *data)
		{
		unsigned int idx = clkspec->args[0];

		if (idx >= HI3660_CLK_STUB_NUM) {
		pr_err("%s: invalid index %u\n", __func__, idx);
		return ERR_PTR(-EINVAL);
		}

		return &hi3660_stub_clks[idx].hw;
		}

		static int hi3660_stub_clk_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct resource *res;
		unsigned int i;
		int ret;

		/* Use mailbox client without blocking */
		stub_clk_chan.cl.dev = dev;
		stub_clk_chan.cl.tx_done = NULL;
		stub_clk_chan.cl.tx_block = false;
		stub_clk_chan.cl.knows_txdone = false;

		/* Allocate mailbox channel */
		stub_clk_chan.mbox = mbox_request_channel(&stub_clk_chan.cl, 0);
		if (IS_ERR(stub_clk_chan.mbox))
		return PTR_ERR(stub_clk_chan.mbox);

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		freq_reg = devm_ioremap(dev, res->start, resource_size(res));
		if (!freq_reg)
		return -ENOMEM;

		freq_reg += HI3660_STUB_CLOCK_DATA;

		for (i = 0; i < HI3660_CLK_STUB_NUM; i++) {
		ret = devm_clk_hw_register(&pdev->dev, &hi3660_stub_clks[i].hw);
		if (ret)
		return ret;
		}

		return devm_of_clk_add_hw_provider(&pdev->dev, hi3660_stub_clk_hw_get,
		hi3660_stub_clks);
		}

		static const struct of_device_id hi3660_stub_clk_of_match[] = {
		{ .compatible = "hisilicon,hi3660-stub-clk", },
		{}
		};

		static struct platform_driver hi3660_stub_clk_driver = {
		.probe = hi3660_stub_clk_probe,
		.driver = {
		.name = "hi3660-stub-clk",
		.of_match_table = hi3660_stub_clk_of_match,
		},
		};

		static int __init hi3660_stub_clk_init(void)
		{
		return platform_driver_register(&hi3660_stub_clk_driver);
		}
		subsys_initcall(hi3660_stub_clk_init);

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