1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2022 Collabora Ltd.
4  * Author: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
5  */
6 
7 #include <dt-bindings/clock/mediatek,mt6795-clk.h>
8 #include <dt-bindings/reset/mediatek,mt6795-resets.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include "clk-gate.h"
12 #include "clk-mtk.h"
13 #include "reset.h"
14 
15 #define GATE_PERI(_id, _name, _parent, _shift)			\
16 		GATE_MTK(_id, _name, _parent, &peri_cg_regs,	\
17 			 _shift, &mtk_clk_gate_ops_setclr)
18 
19 static DEFINE_SPINLOCK(mt6795_peri_clk_lock);
20 
21 static const struct mtk_gate_regs peri_cg_regs = {
22 	.set_ofs = 0x0008,
23 	.clr_ofs = 0x0010,
24 	.sta_ofs = 0x0018,
25 };
26 
27 static const char * const uart_ck_sel_parents[] = {
28 	"clk26m",
29 	"uart_sel",
30 };
31 
32 static const struct mtk_composite peri_clks[] = {
33 	MUX(CLK_PERI_UART0_SEL, "uart0_ck_sel", uart_ck_sel_parents, 0x40c, 0, 1),
34 	MUX(CLK_PERI_UART1_SEL, "uart1_ck_sel", uart_ck_sel_parents, 0x40c, 1, 1),
35 	MUX(CLK_PERI_UART2_SEL, "uart2_ck_sel", uart_ck_sel_parents, 0x40c, 2, 1),
36 	MUX(CLK_PERI_UART3_SEL, "uart3_ck_sel", uart_ck_sel_parents, 0x40c, 3, 1),
37 };
38 
39 static const struct mtk_gate peri_gates[] = {
40 	GATE_PERI(CLK_PERI_NFI, "peri_nfi", "axi_sel", 0),
41 	GATE_PERI(CLK_PERI_THERM, "peri_therm", "axi_sel", 1),
42 	GATE_PERI(CLK_PERI_PWM1, "peri_pwm1", "axi_sel", 2),
43 	GATE_PERI(CLK_PERI_PWM2, "peri_pwm2", "axi_sel", 3),
44 	GATE_PERI(CLK_PERI_PWM3, "peri_pwm3", "axi_sel", 4),
45 	GATE_PERI(CLK_PERI_PWM4, "peri_pwm4", "axi_sel", 5),
46 	GATE_PERI(CLK_PERI_PWM5, "peri_pwm5", "axi_sel", 6),
47 	GATE_PERI(CLK_PERI_PWM6, "peri_pwm6", "axi_sel", 7),
48 	GATE_PERI(CLK_PERI_PWM7, "peri_pwm7", "axi_sel", 8),
49 	GATE_PERI(CLK_PERI_PWM, "peri_pwm", "axi_sel", 9),
50 	GATE_PERI(CLK_PERI_USB0, "peri_usb0", "usb30_sel", 10),
51 	GATE_PERI(CLK_PERI_USB1, "peri_usb1", "usb20_sel", 11),
52 	GATE_PERI(CLK_PERI_AP_DMA, "peri_ap_dma", "axi_sel", 12),
53 	GATE_PERI(CLK_PERI_MSDC30_0, "peri_msdc30_0", "msdc50_0_sel", 13),
54 	GATE_PERI(CLK_PERI_MSDC30_1, "peri_msdc30_1", "msdc30_1_sel", 14),
55 	GATE_PERI(CLK_PERI_MSDC30_2, "peri_msdc30_2", "msdc30_2_sel", 15),
56 	GATE_PERI(CLK_PERI_MSDC30_3, "peri_msdc30_3", "msdc30_3_sel", 16),
57 	GATE_PERI(CLK_PERI_NLI_ARB, "peri_nli_arb", "axi_sel", 17),
58 	GATE_PERI(CLK_PERI_IRDA, "peri_irda", "irda_sel", 18),
59 	GATE_PERI(CLK_PERI_UART0, "peri_uart0", "axi_sel", 19),
60 	GATE_PERI(CLK_PERI_UART1, "peri_uart1", "axi_sel", 20),
61 	GATE_PERI(CLK_PERI_UART2, "peri_uart2", "axi_sel", 21),
62 	GATE_PERI(CLK_PERI_UART3, "peri_uart3", "axi_sel", 22),
63 	GATE_PERI(CLK_PERI_I2C0, "peri_i2c0", "axi_sel", 23),
64 	GATE_PERI(CLK_PERI_I2C1, "peri_i2c1", "axi_sel", 24),
65 	GATE_PERI(CLK_PERI_I2C2, "peri_i2c2", "axi_sel", 25),
66 	GATE_PERI(CLK_PERI_I2C3, "peri_i2c3", "axi_sel", 26),
67 	GATE_PERI(CLK_PERI_I2C4, "peri_i2c4", "axi_sel", 27),
68 	GATE_PERI(CLK_PERI_AUXADC, "peri_auxadc", "clk26m", 28),
69 	GATE_PERI(CLK_PERI_SPI0, "peri_spi0", "spi_sel", 29),
70 };
71 
72 static u16 peri_rst_ofs[] = { 0x0 };
73 
74 static u16 peri_idx_map[] = {
75 	[MT6795_PERI_NFI_SW_RST]   = 14,
76 	[MT6795_PERI_THERM_SW_RST] = 16,
77 	[MT6795_PERI_MSDC1_SW_RST] = 20,
78 };
79 
80 static const struct mtk_clk_rst_desc clk_rst_desc = {
81 	.version = MTK_RST_SIMPLE,
82 	.rst_bank_ofs = peri_rst_ofs,
83 	.rst_bank_nr = ARRAY_SIZE(peri_rst_ofs),
84 	.rst_idx_map = peri_idx_map,
85 	.rst_idx_map_nr = ARRAY_SIZE(peri_idx_map),
86 };
87 
88 static const struct of_device_id of_match_clk_mt6795_pericfg[] = {
89 	{ .compatible = "mediatek,mt6795-pericfg" },
90 	{ /* sentinel */ }
91 };
92 MODULE_DEVICE_TABLE(of, of_match_clk_mt6795_pericfg);
93 
clk_mt6795_pericfg_probe(struct platform_device * pdev)94 static int clk_mt6795_pericfg_probe(struct platform_device *pdev)
95 {
96 	struct clk_hw_onecell_data *clk_data;
97 	struct device_node *node = pdev->dev.of_node;
98 	void __iomem *base;
99 	int ret;
100 
101 	base = devm_platform_ioremap_resource(pdev, 0);
102 	if (IS_ERR(base))
103 		return PTR_ERR(base);
104 
105 	clk_data = mtk_alloc_clk_data(CLK_PERI_NR_CLK);
106 	if (!clk_data)
107 		return -ENOMEM;
108 
109 	ret = mtk_register_reset_controller_with_dev(&pdev->dev, &clk_rst_desc);
110 	if (ret)
111 		goto free_clk_data;
112 
113 	ret = mtk_clk_register_gates(&pdev->dev, node, peri_gates,
114 				     ARRAY_SIZE(peri_gates), clk_data);
115 	if (ret)
116 		goto free_clk_data;
117 
118 	ret = mtk_clk_register_composites(&pdev->dev, peri_clks,
119 					  ARRAY_SIZE(peri_clks), base,
120 					  &mt6795_peri_clk_lock, clk_data);
121 	if (ret)
122 		goto unregister_gates;
123 
124 	ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
125 	if (ret)
126 		goto unregister_composites;
127 
128 	return 0;
129 
130 unregister_composites:
131 	mtk_clk_unregister_composites(peri_clks, ARRAY_SIZE(peri_clks), clk_data);
132 unregister_gates:
133 	mtk_clk_unregister_gates(peri_gates, ARRAY_SIZE(peri_gates), clk_data);
134 free_clk_data:
135 	mtk_free_clk_data(clk_data);
136 	return ret;
137 }
138 
clk_mt6795_pericfg_remove(struct platform_device * pdev)139 static void clk_mt6795_pericfg_remove(struct platform_device *pdev)
140 {
141 	struct device_node *node = pdev->dev.of_node;
142 	struct clk_hw_onecell_data *clk_data = platform_get_drvdata(pdev);
143 
144 	of_clk_del_provider(node);
145 	mtk_clk_unregister_composites(peri_clks, ARRAY_SIZE(peri_clks), clk_data);
146 	mtk_clk_unregister_gates(peri_gates, ARRAY_SIZE(peri_gates), clk_data);
147 	mtk_free_clk_data(clk_data);
148 }
149 
150 static struct platform_driver clk_mt6795_pericfg_drv = {
151 	.driver = {
152 		.name = "clk-mt6795-pericfg",
153 		.of_match_table = of_match_clk_mt6795_pericfg,
154 	},
155 	.probe = clk_mt6795_pericfg_probe,
156 	.remove_new = clk_mt6795_pericfg_remove,
157 };
158 module_platform_driver(clk_mt6795_pericfg_drv);
159 
160 MODULE_DESCRIPTION("MediaTek MT6795 pericfg clocks driver");
161 MODULE_LICENSE("GPL");
162