drivers/clk/mediatek/clk-mt2701-hif.c

   1 /*
   2  * Copyright (c) 2014 MediaTek Inc.
   3  * Author: Shunli Wang <shunli.wang@mediatek.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/clk-provider.h>
  16 #include <linux/platform_device.h>
  17
  18 #include "clk-mtk.h"
  19 #include "clk-gate.h"
  20
  21 #include <dt-bindings/clock/mt2701-clk.h>
  22
  23 static const struct mtk_gate_regs hif_cg_regs = {
  24         .sta_ofs = 0x0030,
  25 };
  26
  27 #define GATE_HIF(_id, _name, _parent, _shift) {         \
  28                 .id = _id,                              \
  29                 .name = _name,                          \
  30                 .parent_name = _parent,                 \
  31                 .regs = &hif_cg_regs,                   \
  32                 .shift = _shift,                        \
  33                 .ops = &mtk_clk_gate_ops_no_setclr_inv, \
  34         }
  35
  36 static const struct mtk_gate hif_clks[] = {
  37         GATE_HIF(CLK_HIFSYS_USB0PHY, "usb0_phy_clk", "ethpll_500m_ck", 21),
  38         GATE_HIF(CLK_HIFSYS_USB1PHY, "usb1_phy_clk", "ethpll_500m_ck", 22),
  39         GATE_HIF(CLK_HIFSYS_PCIE0, "pcie0_clk", "ethpll_500m_ck", 24),
  40         GATE_HIF(CLK_HIFSYS_PCIE1, "pcie1_clk", "ethpll_500m_ck", 25),
  41         GATE_HIF(CLK_HIFSYS_PCIE2, "pcie2_clk", "ethpll_500m_ck", 26),
  42 };
  43
  44 static const struct of_device_id of_match_clk_mt2701_hif[] = {
  45         { .compatible = "mediatek,mt2701-hifsys", },
  46         {}
  47 };
  48
  49 static int clk_mt2701_hif_probe(struct platform_device *pdev)
  50 {
  51         struct clk_onecell_data *clk_data;
  52         int r;
  53         struct device_node *node = pdev->dev.of_node;
  54
  55         clk_data = mtk_alloc_clk_data(CLK_HIFSYS_NR);
  56
  57         mtk_clk_register_gates(node, hif_clks, ARRAY_SIZE(hif_clks),
  58                                                 clk_data);
  59
  60         r = of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
  61         if (r) {
  62                 dev_err(&pdev->dev,
  63                         "could not register clock provider: %s: %d\n",
  64                         pdev->name, r);
  65                 return r;
  66         }
  67
  68         mtk_register_reset_controller(node, 1, 0x34);
  69
  70         return 0;
  71 }
  72
  73 static struct platform_driver clk_mt2701_hif_drv = {
  74         .probe = clk_mt2701_hif_probe,
  75         .driver = {
  76                 .name = "clk-mt2701-hif",
  77                 .of_match_table = of_match_clk_mt2701_hif,
  78         },
  79 };
  80
  81 builtin_platform_driver(clk_mt2701_hif_drv);