179 lines
4.5 KiB
C
179 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hisilicon clock driver
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*
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* Copyright (c) 2013-2017 Hisilicon Limited.
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* Copyright (c) 2017 Linaro Limited.
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*
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* Author: Kai Zhao <zhaokai1@hisilicon.com>
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* Tao Wang <kevin.wangtao@hisilicon.com>
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* Leo Yan <leo.yan@linaro.org>
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*/
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#include <linux/clk-provider.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/mailbox_client.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <dt-bindings/clock/hi3660-clock.h>
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#define HI3660_STUB_CLOCK_DATA (0x70)
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#define MHZ (1000 * 1000)
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#define DEFINE_CLK_STUB(_id, _cmd, _name) \
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{ \
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.id = (_id), \
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.cmd = (_cmd), \
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.hw.init = &(struct clk_init_data) { \
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.name = #_name, \
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.ops = &hi3660_stub_clk_ops, \
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.num_parents = 0, \
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.flags = CLK_GET_RATE_NOCACHE, \
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}, \
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},
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#define to_stub_clk(_hw) container_of(_hw, struct hi3660_stub_clk, hw)
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struct hi3660_stub_clk_chan {
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struct mbox_client cl;
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struct mbox_chan *mbox;
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};
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struct hi3660_stub_clk {
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unsigned int id;
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struct clk_hw hw;
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unsigned int cmd;
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unsigned int msg[8];
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unsigned int rate;
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};
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static void __iomem *freq_reg;
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static struct hi3660_stub_clk_chan stub_clk_chan;
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static unsigned long hi3660_stub_clk_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct hi3660_stub_clk *stub_clk = to_stub_clk(hw);
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/*
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* LPM3 writes back the CPU frequency in shared SRAM so read
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* back the frequency.
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*/
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stub_clk->rate = readl(freq_reg + (stub_clk->id << 2)) * MHZ;
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return stub_clk->rate;
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}
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static long hi3660_stub_clk_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *prate)
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{
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/*
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* LPM3 handles rate rounding so just return whatever
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* rate is requested.
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*/
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return rate;
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}
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static int hi3660_stub_clk_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct hi3660_stub_clk *stub_clk = to_stub_clk(hw);
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stub_clk->msg[0] = stub_clk->cmd;
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stub_clk->msg[1] = rate / MHZ;
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dev_dbg(stub_clk_chan.cl.dev, "set rate msg[0]=0x%x msg[1]=0x%x\n",
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stub_clk->msg[0], stub_clk->msg[1]);
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mbox_send_message(stub_clk_chan.mbox, stub_clk->msg);
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mbox_client_txdone(stub_clk_chan.mbox, 0);
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stub_clk->rate = rate;
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return 0;
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}
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static const struct clk_ops hi3660_stub_clk_ops = {
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.recalc_rate = hi3660_stub_clk_recalc_rate,
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.round_rate = hi3660_stub_clk_round_rate,
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.set_rate = hi3660_stub_clk_set_rate,
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};
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static struct hi3660_stub_clk hi3660_stub_clks[HI3660_CLK_STUB_NUM] = {
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DEFINE_CLK_STUB(HI3660_CLK_STUB_CLUSTER0, 0x0001030A, "cpu-cluster.0")
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DEFINE_CLK_STUB(HI3660_CLK_STUB_CLUSTER1, 0x0002030A, "cpu-cluster.1")
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DEFINE_CLK_STUB(HI3660_CLK_STUB_GPU, 0x0003030A, "clk-g3d")
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DEFINE_CLK_STUB(HI3660_CLK_STUB_DDR, 0x00040309, "clk-ddrc")
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};
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static struct clk_hw *hi3660_stub_clk_hw_get(struct of_phandle_args *clkspec,
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void *data)
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{
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unsigned int idx = clkspec->args[0];
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if (idx >= HI3660_CLK_STUB_NUM) {
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pr_err("%s: invalid index %u\n", __func__, idx);
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return ERR_PTR(-EINVAL);
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}
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return &hi3660_stub_clks[idx].hw;
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}
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static int hi3660_stub_clk_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *res;
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unsigned int i;
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int ret;
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/* Use mailbox client without blocking */
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stub_clk_chan.cl.dev = dev;
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stub_clk_chan.cl.tx_done = NULL;
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stub_clk_chan.cl.tx_block = false;
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stub_clk_chan.cl.knows_txdone = false;
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/* Allocate mailbox channel */
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stub_clk_chan.mbox = mbox_request_channel(&stub_clk_chan.cl, 0);
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if (IS_ERR(stub_clk_chan.mbox))
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return PTR_ERR(stub_clk_chan.mbox);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -EINVAL;
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freq_reg = devm_ioremap(dev, res->start, resource_size(res));
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if (!freq_reg)
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return -ENOMEM;
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freq_reg += HI3660_STUB_CLOCK_DATA;
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for (i = 0; i < HI3660_CLK_STUB_NUM; i++) {
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ret = devm_clk_hw_register(&pdev->dev, &hi3660_stub_clks[i].hw);
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if (ret)
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return ret;
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}
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return devm_of_clk_add_hw_provider(&pdev->dev, hi3660_stub_clk_hw_get,
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hi3660_stub_clks);
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}
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static const struct of_device_id hi3660_stub_clk_of_match[] = {
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{ .compatible = "hisilicon,hi3660-stub-clk", },
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{}
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};
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static struct platform_driver hi3660_stub_clk_driver = {
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.probe = hi3660_stub_clk_probe,
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.driver = {
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.name = "hi3660-stub-clk",
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.of_match_table = hi3660_stub_clk_of_match,
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},
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};
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static int __init hi3660_stub_clk_init(void)
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{
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return platform_driver_register(&hi3660_stub_clk_driver);
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}
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subsys_initcall(hi3660_stub_clk_init);
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