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178 lines
4.5 KiB
178 lines
4.5 KiB
// 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 <[email protected]> |
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* Tao Wang <[email protected]> |
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* Leo Yan <[email protected]> |
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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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