Merge branch 'clk-hi3660-stub' into clk-next

	- "hisilicon,hi3660-pmuctrl"

	- "hisilicon,hi3660-sctrl"

	- "hisilicon,hi3660-iomcu"

	- "hisilicon,hi3660-stub-clk"

- reg: physical base address of the controller and length of memory mapped

  region.

- #clock-cells: should be 1.

Optional Properties:

- mboxes: Phandle to the mailbox for sending message to MCU.

            (See: ../mailbox/hisilicon,hi3660-mailbox.txt for more info)

Each clock is assigned an identifier and client nodes use this identifier

to specify the clock which they consume.

	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.

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

/*

 * 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);

#define HI3660_CLK_I2C6_IOMCU		3

#define HI3660_CLK_IOMCU_PERI0		4

/* clk in stub clock */

#define HI3660_CLK_STUB_CLUSTER0	0

#define HI3660_CLK_STUB_CLUSTER1	1

#define HI3660_CLK_STUB_GPU		2

#define HI3660_CLK_STUB_DDR		3

#define HI3660_CLK_STUB_NUM		4

#endif	/* __DTS_HI3660_CLOCK_H */