2 * Ingenic JZ4740 SoC CGU driver
4 * Copyright (c) 2015 Imagination Technologies
5 * Author: Paul Burton <paul.burton@imgtec.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
18 #include <linux/clk-provider.h>
19 #include <linux/delay.h>
21 #include <dt-bindings/clock/jz4740-cgu.h>
22 #include <asm/mach-jz4740/clock.h>
25 /* CGU register offsets */
26 #define CGU_REG_CPCCR 0x00
27 #define CGU_REG_LCR 0x04
28 #define CGU_REG_CPPCR 0x10
29 #define CGU_REG_SCR 0x24
30 #define CGU_REG_I2SCDR 0x60
31 #define CGU_REG_LPCDR 0x64
32 #define CGU_REG_MSCCDR 0x68
33 #define CGU_REG_UHCCDR 0x6c
34 #define CGU_REG_SSICDR 0x74
36 /* bits within a PLL control register */
37 #define PLLCTL_M_SHIFT 23
38 #define PLLCTL_M_MASK (0x1ff << PLLCTL_M_SHIFT)
39 #define PLLCTL_N_SHIFT 18
40 #define PLLCTL_N_MASK (0x1f << PLLCTL_N_SHIFT)
41 #define PLLCTL_OD_SHIFT 16
42 #define PLLCTL_OD_MASK (0x3 << PLLCTL_OD_SHIFT)
43 #define PLLCTL_STABLE (1 << 10)
44 #define PLLCTL_BYPASS (1 << 9)
45 #define PLLCTL_ENABLE (1 << 8)
47 /* bits within the LCR register */
48 #define LCR_SLEEP (1 << 0)
50 static struct ingenic_cgu *cgu;
52 static const s8 pll_od_encoding[4] = {
56 static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
60 [JZ4740_CLK_EXT] = { "ext", CGU_CLK_EXT },
61 [JZ4740_CLK_RTC] = { "rtc", CGU_CLK_EXT },
65 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
77 .od_encoding = pll_od_encoding,
84 /* Muxes & dividers */
86 [JZ4740_CLK_PLL_HALF] = {
87 "pll half", CGU_CLK_DIV,
88 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
89 .div = { CGU_REG_CPCCR, 21, 1, -1, -1, -1 },
94 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
95 .div = { CGU_REG_CPCCR, 0, 4, 22, -1, -1 },
100 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
101 .div = { CGU_REG_CPCCR, 4, 4, 22, -1, -1 },
104 [JZ4740_CLK_PCLK] = {
106 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
107 .div = { CGU_REG_CPCCR, 8, 4, 22, -1, -1 },
110 [JZ4740_CLK_MCLK] = {
112 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
113 .div = { CGU_REG_CPCCR, 12, 4, 22, -1, -1 },
117 "lcd", CGU_CLK_DIV | CGU_CLK_GATE,
118 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
119 .div = { CGU_REG_CPCCR, 16, 5, 22, -1, -1 },
120 .gate = { CGU_REG_CLKGR, 10 },
123 [JZ4740_CLK_LCD_PCLK] = {
124 "lcd_pclk", CGU_CLK_DIV,
125 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
126 .div = { CGU_REG_LPCDR, 0, 11, -1, -1, -1 },
130 "i2s", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
131 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
132 .mux = { CGU_REG_CPCCR, 31, 1 },
133 .div = { CGU_REG_I2SCDR, 0, 8, -1, -1, -1 },
134 .gate = { CGU_REG_CLKGR, 6 },
138 "spi", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
139 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL, -1, -1 },
140 .mux = { CGU_REG_SSICDR, 31, 1 },
141 .div = { CGU_REG_SSICDR, 0, 4, -1, -1, -1 },
142 .gate = { CGU_REG_CLKGR, 4 },
146 "mmc", CGU_CLK_DIV | CGU_CLK_GATE,
147 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
148 .div = { CGU_REG_MSCCDR, 0, 5, -1, -1, -1 },
149 .gate = { CGU_REG_CLKGR, 7 },
153 "uhc", CGU_CLK_DIV | CGU_CLK_GATE,
154 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
155 .div = { CGU_REG_UHCCDR, 0, 4, -1, -1, -1 },
156 .gate = { CGU_REG_CLKGR, 14 },
160 "udc", CGU_CLK_MUX | CGU_CLK_DIV,
161 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
162 .mux = { CGU_REG_CPCCR, 29, 1 },
163 .div = { CGU_REG_CPCCR, 23, 6, -1, -1, -1 },
164 .gate = { CGU_REG_SCR, 6 },
167 /* Gate-only clocks */
169 [JZ4740_CLK_UART0] = {
170 "uart0", CGU_CLK_GATE,
171 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
172 .gate = { CGU_REG_CLKGR, 0 },
175 [JZ4740_CLK_UART1] = {
176 "uart1", CGU_CLK_GATE,
177 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
178 .gate = { CGU_REG_CLKGR, 15 },
183 .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
184 .gate = { CGU_REG_CLKGR, 12 },
189 .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
190 .gate = { CGU_REG_CLKGR, 13 },
195 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
196 .gate = { CGU_REG_CLKGR, 8 },
201 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
202 .gate = { CGU_REG_CLKGR, 3 },
207 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
208 .gate = { CGU_REG_CLKGR, 5 },
212 static void __init jz4740_cgu_init(struct device_node *np)
216 cgu = ingenic_cgu_new(jz4740_cgu_clocks,
217 ARRAY_SIZE(jz4740_cgu_clocks), np);
219 pr_err("%s: failed to initialise CGU\n", __func__);
223 retval = ingenic_cgu_register_clocks(cgu);
225 pr_err("%s: failed to register CGU Clocks\n", __func__);
227 CLK_OF_DECLARE(jz4740_cgu, "ingenic,jz4740-cgu", jz4740_cgu_init);
229 void jz4740_clock_set_wait_mode(enum jz4740_wait_mode mode)
231 uint32_t lcr = readl(cgu->base + CGU_REG_LCR);
234 case JZ4740_WAIT_MODE_IDLE:
238 case JZ4740_WAIT_MODE_SLEEP:
243 writel(lcr, cgu->base + CGU_REG_LCR);