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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | // SPDX-License-Identifier: GPL-2.0-or-later /* * 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> */ #include <linux/clk-provider.h> #include <linux/device.h> #include <linux/err.h> #include <linux/init.h> #include <linux/io.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); if (!res) return -EINVAL; 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); |