1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * StarFive JH7110 Always-On Clock Driver
4 *
5 * Copyright (C) 2022 Emil Renner Berthing <kernel@esmil.dk>
6 * Copyright (C) 2022 StarFive Technology Co., Ltd.
7 */
8
9 #include <linux/clk-provider.h>
10 #include <linux/io.h>
11 #include <linux/platform_device.h>
12
13 #include <dt-bindings/clock/starfive,jh7110-crg.h>
14
15 #include "clk-starfive-jh7110.h"
16
17 /* external clocks */
18 #define JH7110_AONCLK_OSC (JH7110_AONCLK_END + 0)
19 #define JH7110_AONCLK_GMAC0_RMII_REFIN (JH7110_AONCLK_END + 1)
20 #define JH7110_AONCLK_GMAC0_RGMII_RXIN (JH7110_AONCLK_END + 2)
21 #define JH7110_AONCLK_STG_AXIAHB (JH7110_AONCLK_END + 3)
22 #define JH7110_AONCLK_APB_BUS (JH7110_AONCLK_END + 4)
23 #define JH7110_AONCLK_GMAC0_GTXCLK (JH7110_AONCLK_END + 5)
24 #define JH7110_AONCLK_RTC_OSC (JH7110_AONCLK_END + 6)
25
26 static const struct jh71x0_clk_data jh7110_aonclk_data[] = {
27 /* source */
28 JH71X0__DIV(JH7110_AONCLK_OSC_DIV4, "osc_div4", 4, JH7110_AONCLK_OSC),
29 JH71X0__MUX(JH7110_AONCLK_APB_FUNC, "apb_func", 0, 2,
30 JH7110_AONCLK_OSC_DIV4,
31 JH7110_AONCLK_OSC),
32 /* gmac0 */
33 JH71X0_GATE(JH7110_AONCLK_GMAC0_AHB, "gmac0_ahb", 0, JH7110_AONCLK_STG_AXIAHB),
34 JH71X0_GATE(JH7110_AONCLK_GMAC0_AXI, "gmac0_axi", 0, JH7110_AONCLK_STG_AXIAHB),
35 JH71X0__DIV(JH7110_AONCLK_GMAC0_RMII_RTX, "gmac0_rmii_rtx", 30,
36 JH7110_AONCLK_GMAC0_RMII_REFIN),
37 JH71X0_GMUX(JH7110_AONCLK_GMAC0_TX, "gmac0_tx",
38 CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT, 2,
39 JH7110_AONCLK_GMAC0_GTXCLK,
40 JH7110_AONCLK_GMAC0_RMII_RTX),
41 JH71X0__INV(JH7110_AONCLK_GMAC0_TX_INV, "gmac0_tx_inv", JH7110_AONCLK_GMAC0_TX),
42 JH71X0__MUX(JH7110_AONCLK_GMAC0_RX, "gmac0_rx", 0, 2,
43 JH7110_AONCLK_GMAC0_RGMII_RXIN,
44 JH7110_AONCLK_GMAC0_RMII_RTX),
45 JH71X0__INV(JH7110_AONCLK_GMAC0_RX_INV, "gmac0_rx_inv", JH7110_AONCLK_GMAC0_RX),
46 /* otpc */
47 JH71X0_GATE(JH7110_AONCLK_OTPC_APB, "otpc_apb", 0, JH7110_AONCLK_APB_BUS),
48 /* rtc */
49 JH71X0_GATE(JH7110_AONCLK_RTC_APB, "rtc_apb", 0, JH7110_AONCLK_APB_BUS),
50 JH71X0__DIV(JH7110_AONCLK_RTC_INTERNAL, "rtc_internal", 1022, JH7110_AONCLK_OSC),
51 JH71X0__MUX(JH7110_AONCLK_RTC_32K, "rtc_32k", 0, 2,
52 JH7110_AONCLK_RTC_OSC,
53 JH7110_AONCLK_RTC_INTERNAL),
54 JH71X0_GATE(JH7110_AONCLK_RTC_CAL, "rtc_cal", 0, JH7110_AONCLK_OSC),
55 };
56
jh7110_aonclk_get(struct of_phandle_args * clkspec,void * data)57 static struct clk_hw *jh7110_aonclk_get(struct of_phandle_args *clkspec, void *data)
58 {
59 struct jh71x0_clk_priv *priv = data;
60 unsigned int idx = clkspec->args[0];
61
62 if (idx < JH7110_AONCLK_END)
63 return &priv->reg[idx].hw;
64
65 return ERR_PTR(-EINVAL);
66 }
67
jh7110_aoncrg_probe(struct platform_device * pdev)68 static int jh7110_aoncrg_probe(struct platform_device *pdev)
69 {
70 struct jh71x0_clk_priv *priv;
71 unsigned int idx;
72 int ret;
73
74 priv = devm_kzalloc(&pdev->dev,
75 struct_size(priv, reg, JH7110_AONCLK_END),
76 GFP_KERNEL);
77 if (!priv)
78 return -ENOMEM;
79
80 spin_lock_init(&priv->rmw_lock);
81 priv->dev = &pdev->dev;
82 priv->base = devm_platform_ioremap_resource(pdev, 0);
83 if (IS_ERR(priv->base))
84 return PTR_ERR(priv->base);
85
86 for (idx = 0; idx < JH7110_AONCLK_END; idx++) {
87 u32 max = jh7110_aonclk_data[idx].max;
88 struct clk_parent_data parents[4] = {};
89 struct clk_init_data init = {
90 .name = jh7110_aonclk_data[idx].name,
91 .ops = starfive_jh71x0_clk_ops(max),
92 .parent_data = parents,
93 .num_parents =
94 ((max & JH71X0_CLK_MUX_MASK) >> JH71X0_CLK_MUX_SHIFT) + 1,
95 .flags = jh7110_aonclk_data[idx].flags,
96 };
97 struct jh71x0_clk *clk = &priv->reg[idx];
98 unsigned int i;
99
100 for (i = 0; i < init.num_parents; i++) {
101 unsigned int pidx = jh7110_aonclk_data[idx].parents[i];
102
103 if (pidx < JH7110_AONCLK_END)
104 parents[i].hw = &priv->reg[pidx].hw;
105 else if (pidx == JH7110_AONCLK_OSC)
106 parents[i].fw_name = "osc";
107 else if (pidx == JH7110_AONCLK_GMAC0_RMII_REFIN)
108 parents[i].fw_name = "gmac0_rmii_refin";
109 else if (pidx == JH7110_AONCLK_GMAC0_RGMII_RXIN)
110 parents[i].fw_name = "gmac0_rgmii_rxin";
111 else if (pidx == JH7110_AONCLK_STG_AXIAHB)
112 parents[i].fw_name = "stg_axiahb";
113 else if (pidx == JH7110_AONCLK_APB_BUS)
114 parents[i].fw_name = "apb_bus";
115 else if (pidx == JH7110_AONCLK_GMAC0_GTXCLK)
116 parents[i].fw_name = "gmac0_gtxclk";
117 else if (pidx == JH7110_AONCLK_RTC_OSC)
118 parents[i].fw_name = "rtc_osc";
119 }
120
121 clk->hw.init = &init;
122 clk->idx = idx;
123 clk->max_div = max & JH71X0_CLK_DIV_MASK;
124
125 ret = devm_clk_hw_register(&pdev->dev, &clk->hw);
126 if (ret)
127 return ret;
128 }
129
130 ret = devm_of_clk_add_hw_provider(&pdev->dev, jh7110_aonclk_get, priv);
131 if (ret)
132 return ret;
133
134 return jh7110_reset_controller_register(priv, "rst-aon", 1);
135 }
136
137 static const struct of_device_id jh7110_aoncrg_match[] = {
138 { .compatible = "starfive,jh7110-aoncrg" },
139 { /* sentinel */ }
140 };
141 MODULE_DEVICE_TABLE(of, jh7110_aoncrg_match);
142
143 static struct platform_driver jh7110_aoncrg_driver = {
144 .probe = jh7110_aoncrg_probe,
145 .driver = {
146 .name = "clk-starfive-jh7110-aon",
147 .of_match_table = jh7110_aoncrg_match,
148 },
149 };
150 module_platform_driver(jh7110_aoncrg_driver);
151
152 MODULE_AUTHOR("Emil Renner Berthing");
153 MODULE_DESCRIPTION("StarFive JH7110 always-on clock driver");
154 MODULE_LICENSE("GPL");
155