tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2017 Icenowy Zheng <icenowy@aosc.xyz>
4 */
5
6#include <linux/clk-provider.h>
7#include <linux/of_address.h>
8#include <linux/platform_device.h>
9
10#include "ccu_common.h"
11#include "ccu_reset.h"
12
13#include "ccu_div.h"
14#include "ccu_gate.h"
15#include "ccu_mp.h"
16#include "ccu_nm.h"
17
18#include "ccu-sun50i-h6-r.h"
19
20/*
21 * Information about AR100 and AHB/APB clocks in R_CCU are gathered from
22 * clock definitions in the BSP source code.
23 */
24
25static const char * const ar100_r_apb2_parents[] = { "osc24M", "osc32k",
26 "pll-periph0", "iosc" };
27static const struct ccu_mux_var_prediv ar100_r_apb2_predivs[] = {
28 { .index = 2, .shift = 0, .width = 5 },
29};
30
31static struct ccu_div ar100_clk = {
32 .div = _SUNXI_CCU_DIV_FLAGS(8, 2, CLK_DIVIDER_POWER_OF_TWO),
33
34 .mux = {
35 .shift = 24,
36 .width = 2,
37
38 .var_predivs = ar100_r_apb2_predivs,
39 .n_var_predivs = ARRAY_SIZE(ar100_r_apb2_predivs),
40 },
41
42 .common = {
43 .reg = 0x000,
44 .features = CCU_FEATURE_VARIABLE_PREDIV,
45 .hw.init = CLK_HW_INIT_PARENTS("ar100",
46 ar100_r_apb2_parents,
47 &ccu_div_ops,
48 0),
49 },
50};
51
52static CLK_FIXED_FACTOR_HW(r_ahb_clk, "r-ahb", &ar100_clk.common.hw, 1, 1, 0);
53
54static struct ccu_div r_apb1_clk = {
55 .div = _SUNXI_CCU_DIV(0, 2),
56
57 .common = {
58 .reg = 0x00c,
59 .hw.init = CLK_HW_INIT("r-apb1",
60 "r-ahb",
61 &ccu_div_ops,
62 0),
63 },
64};
65
66static struct ccu_div r_apb2_clk = {
67 .div = _SUNXI_CCU_DIV_FLAGS(8, 2, CLK_DIVIDER_POWER_OF_TWO),
68
69 .mux = {
70 .shift = 24,
71 .width = 2,
72
73 .var_predivs = ar100_r_apb2_predivs,
74 .n_var_predivs = ARRAY_SIZE(ar100_r_apb2_predivs),
75 },
76
77 .common = {
78 .reg = 0x010,
79 .features = CCU_FEATURE_VARIABLE_PREDIV,
80 .hw.init = CLK_HW_INIT_PARENTS("r-apb2",
81 ar100_r_apb2_parents,
82 &ccu_div_ops,
83 0),
84 },
85};
86
87/*
88 * Information about the gate/resets are gathered from the clock header file
89 * in the BSP source code, although most of them are unused. The existence
90 * of the hardware block is verified with "3.1 Memory Mapping" chapter in
91 * "Allwinner H6 V200 User Manual V1.1"; and the parent APB buses are verified
92 * with "3.3.2.1 System Bus Tree" chapter inthe same document.
93 */
94static SUNXI_CCU_GATE(r_apb1_timer_clk, "r-apb1-timer", "r-apb1",
95 0x11c, BIT(0), 0);
96static SUNXI_CCU_GATE(r_apb1_twd_clk, "r-apb1-twd", "r-apb1",
97 0x12c, BIT(0), 0);
98static SUNXI_CCU_GATE(r_apb1_pwm_clk, "r-apb1-pwm", "r-apb1",
99 0x13c, BIT(0), 0);
100static SUNXI_CCU_GATE(r_apb2_uart_clk, "r-apb2-uart", "r-apb2",
101 0x18c, BIT(0), 0);
102static SUNXI_CCU_GATE(r_apb2_i2c_clk, "r-apb2-i2c", "r-apb2",
103 0x19c, BIT(0), 0);
104static SUNXI_CCU_GATE(r_apb1_ir_clk, "r-apb1-ir", "r-apb1",
105 0x1cc, BIT(0), 0);
106static SUNXI_CCU_GATE(r_apb1_w1_clk, "r-apb1-w1", "r-apb1",
107 0x1ec, BIT(0), 0);
108
109/* Information of IR(RX) mod clock is gathered from BSP source code */
110static const char * const r_mod0_default_parents[] = { "osc32k", "osc24M" };
111static SUNXI_CCU_MP_WITH_MUX_GATE(ir_clk, "ir",
112 r_mod0_default_parents, 0x1c0,
113 0, 5, /* M */
114 8, 2, /* P */
115 24, 1, /* mux */
116 BIT(31), /* gate */
117 0);
118
119/*
120 * BSP didn't use the 1-wire function at all now, and the information about
121 * this mod clock is guessed from the IR mod clock above. The existence of
122 * this mod clock is proven by BSP clock header, and the dividers are verified
123 * by contents in the 1-wire related chapter of the User Manual.
124 */
125
126static SUNXI_CCU_MP_WITH_MUX_GATE(w1_clk, "w1",
127 r_mod0_default_parents, 0x1e0,
128 0, 5, /* M */
129 8, 2, /* P */
130 24, 1, /* mux */
131 BIT(31), /* gate */
132 0);
133
134static struct ccu_common *sun50i_h6_r_ccu_clks[] = {
135 &ar100_clk.common,
136 &r_apb1_clk.common,
137 &r_apb2_clk.common,
138 &r_apb1_timer_clk.common,
139 &r_apb1_twd_clk.common,
140 &r_apb1_pwm_clk.common,
141 &r_apb2_uart_clk.common,
142 &r_apb2_i2c_clk.common,
143 &r_apb1_ir_clk.common,
144 &r_apb1_w1_clk.common,
145 &ir_clk.common,
146 &w1_clk.common,
147};
148
149static struct clk_hw_onecell_data sun50i_h6_r_hw_clks = {
150 .hws = {
151 [CLK_AR100] = &ar100_clk.common.hw,
152 [CLK_R_AHB] = &r_ahb_clk.hw,
153 [CLK_R_APB1] = &r_apb1_clk.common.hw,
154 [CLK_R_APB2] = &r_apb2_clk.common.hw,
155 [CLK_R_APB1_TIMER] = &r_apb1_timer_clk.common.hw,
156 [CLK_R_APB1_TWD] = &r_apb1_twd_clk.common.hw,
157 [CLK_R_APB1_PWM] = &r_apb1_pwm_clk.common.hw,
158 [CLK_R_APB2_UART] = &r_apb2_uart_clk.common.hw,
159 [CLK_R_APB2_I2C] = &r_apb2_i2c_clk.common.hw,
160 [CLK_R_APB1_IR] = &r_apb1_ir_clk.common.hw,
161 [CLK_R_APB1_W1] = &r_apb1_w1_clk.common.hw,
162 [CLK_IR] = &ir_clk.common.hw,
163 [CLK_W1] = &w1_clk.common.hw,
164 },
165 .num = CLK_NUMBER,
166};
167
168static struct ccu_reset_map sun50i_h6_r_ccu_resets[] = {
169 [RST_R_APB1_TIMER] = { 0x11c, BIT(16) },
170 [RST_R_APB1_TWD] = { 0x12c, BIT(16) },
171 [RST_R_APB1_PWM] = { 0x13c, BIT(16) },
172 [RST_R_APB2_UART] = { 0x18c, BIT(16) },
173 [RST_R_APB2_I2C] = { 0x19c, BIT(16) },
174 [RST_R_APB1_IR] = { 0x1cc, BIT(16) },
175 [RST_R_APB1_W1] = { 0x1ec, BIT(16) },
176};
177
178static const struct sunxi_ccu_desc sun50i_h6_r_ccu_desc = {
179 .ccu_clks = sun50i_h6_r_ccu_clks,
180 .num_ccu_clks = ARRAY_SIZE(sun50i_h6_r_ccu_clks),
181
182 .hw_clks = &sun50i_h6_r_hw_clks,
183
184 .resets = sun50i_h6_r_ccu_resets,
185 .num_resets = ARRAY_SIZE(sun50i_h6_r_ccu_resets),
186};
187
188static void __init sunxi_r_ccu_init(struct device_node *node,
189 const struct sunxi_ccu_desc *desc)
190{
191 void __iomem *reg;
192
193 reg = of_io_request_and_map(node, 0, of_node_full_name(node));
194 if (IS_ERR(reg)) {
195 pr_err("%pOF: Could not map the clock registers\n", node);
196 return;
197 }
198
199 sunxi_ccu_probe(node, reg, desc);
200}
201
202static void __init sun50i_h6_r_ccu_setup(struct device_node *node)
203{
204 sunxi_r_ccu_init(node, &sun50i_h6_r_ccu_desc);
205}
206CLK_OF_DECLARE(sun50i_h6_r_ccu, "allwinner,sun50i-h6-r-ccu",
207 sun50i_h6_r_ccu_setup);