drivers/clk/mediatek/clk-mt7988-xfipll.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2023 Daniel Golle <daniel@makrotopia.org>
   4  */
   5
   6 #include <linux/clk-provider.h>
   7 #include <linux/of.h>
   8 #include <linux/of_address.h>
   9 #include <linux/of_device.h>
  10 #include <linux/platform_device.h>
  11 #include "clk-mtk.h"
  12 #include "clk-gate.h"
  13 #include <dt-bindings/clock/mediatek,mt7988-clk.h>
  14
  15 /* Register to control USXGMII XFI PLL analog */
  16 #define XFI_PLL_ANA_GLB8                0x108
  17 #define RG_XFI_PLL_ANA_SWWA             0x02283248
  18
  19 static const struct mtk_gate_regs xfipll_cg_regs = {
  20         .set_ofs = 0x8,
  21         .clr_ofs = 0x8,
  22         .sta_ofs = 0x8,
  23 };
  24
  25 #define GATE_XFIPLL(_id, _name, _parent, _shift)                \
  26         {                                                       \
  27                 .id = _id,                                      \
  28                 .name = _name,                                  \
  29                 .parent_name = _parent,                         \
  30                 .regs = &xfipll_cg_regs,                        \
  31                 .shift = _shift,                                \
  32                 .ops = &mtk_clk_gate_ops_no_setclr_inv,         \
  33         }
  34
  35 static const struct mtk_fixed_factor xfipll_divs[] = {
  36         FACTOR(CLK_XFIPLL_PLL, "xfipll_pll", "top_xtal", 125, 32),
  37 };
  38
  39 static const struct mtk_gate xfipll_clks[] = {
  40         GATE_XFIPLL(CLK_XFIPLL_PLL_EN, "xfipll_pll_en", "xfipll_pll", 31),
  41 };
  42
  43 static const struct mtk_clk_desc xfipll_desc = {
  44         .clks = xfipll_clks,
  45         .num_clks = ARRAY_SIZE(xfipll_clks),
  46         .factor_clks = xfipll_divs,
  47         .num_factor_clks = ARRAY_SIZE(xfipll_divs),
  48 };
  49
  50 static int clk_mt7988_xfipll_probe(struct platform_device *pdev)
  51 {
  52         struct device_node *node = pdev->dev.of_node;
  53         void __iomem *base = of_iomap(node, 0);
  54
  55         if (!base)
  56                 return -ENOMEM;
  57
  58         /* Apply software workaround for USXGMII PLL TCL issue */
  59         writel(RG_XFI_PLL_ANA_SWWA, base + XFI_PLL_ANA_GLB8);
  60         iounmap(base);
  61
  62         return mtk_clk_simple_probe(pdev);
  63 };
  64
  65 static const struct of_device_id of_match_clk_mt7988_xfipll[] = {
  66         { .compatible = "mediatek,mt7988-xfi-pll", .data = &xfipll_desc },
  67         { /* sentinel */ }
  68 };
  69 MODULE_DEVICE_TABLE(of, of_match_clk_mt7988_xfipll);
  70
  71 static struct platform_driver clk_mt7988_xfipll_drv = {
  72         .driver = {
  73                 .name = "clk-mt7988-xfipll",
  74                 .of_match_table = of_match_clk_mt7988_xfipll,
  75         },
  76         .probe = clk_mt7988_xfipll_probe,
  77         .remove = mtk_clk_simple_remove,
  78 };
  79 module_platform_driver(clk_mt7988_xfipll_drv);
  80
  81 MODULE_DESCRIPTION("MediaTek MT7988 XFI PLL clock driver");
  82 MODULE_LICENSE("GPL");