2 * Ingenic JZ4740 SoC CGU driver
4 * Copyright (c) 2015 Imagination Technologies
5 * Author: Paul Burton <paul.burton@mips.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>
22 #include <dt-bindings/clock/jz4740-cgu.h>
23 #include <asm/mach-jz4740/clock.h>
26 /* CGU register offsets */
27 #define CGU_REG_CPCCR 0x00
28 #define CGU_REG_LCR 0x04
29 #define CGU_REG_CPPCR 0x10
30 #define CGU_REG_CLKGR 0x20
31 #define CGU_REG_SCR 0x24
32 #define CGU_REG_I2SCDR 0x60
33 #define CGU_REG_LPCDR 0x64
34 #define CGU_REG_MSCCDR 0x68
35 #define CGU_REG_UHCCDR 0x6c
36 #define CGU_REG_SSICDR 0x74
38 /* bits within a PLL control register */
39 #define PLLCTL_M_SHIFT 23
40 #define PLLCTL_M_MASK (0x1ff << PLLCTL_M_SHIFT)
41 #define PLLCTL_N_SHIFT 18
42 #define PLLCTL_N_MASK (0x1f << PLLCTL_N_SHIFT)
43 #define PLLCTL_OD_SHIFT 16
44 #define PLLCTL_OD_MASK (0x3 << PLLCTL_OD_SHIFT)
45 #define PLLCTL_STABLE (1 << 10)
46 #define PLLCTL_BYPASS (1 << 9)
47 #define PLLCTL_ENABLE (1 << 8)
49 /* bits within the LCR register */
50 #define LCR_SLEEP (1 << 0)
52 /* bits within the CLKGR register */
53 #define CLKGR_UDC (1 << 11)
55 static struct ingenic_cgu *cgu;
57 static const s8 pll_od_encoding[4] = {
61 static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
65 [JZ4740_CLK_EXT] = { "ext", CGU_CLK_EXT },
66 [JZ4740_CLK_RTC] = { "rtc", CGU_CLK_EXT },
70 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
82 .od_encoding = pll_od_encoding,
89 /* Muxes & dividers */
91 [JZ4740_CLK_PLL_HALF] = {
92 "pll half", CGU_CLK_DIV,
93 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
94 .div = { CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1 },
99 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
100 .div = { CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1 },
103 [JZ4740_CLK_HCLK] = {
105 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
106 .div = { CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1 },
109 [JZ4740_CLK_PCLK] = {
111 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
112 .div = { CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1 },
115 [JZ4740_CLK_MCLK] = {
117 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
118 .div = { CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1 },
122 "lcd", CGU_CLK_DIV | CGU_CLK_GATE,
123 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
124 .div = { CGU_REG_CPCCR, 16, 1, 5, 22, -1, -1 },
125 .gate = { CGU_REG_CLKGR, 10 },
128 [JZ4740_CLK_LCD_PCLK] = {
129 "lcd_pclk", CGU_CLK_DIV,
130 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
131 .div = { CGU_REG_LPCDR, 0, 1, 11, -1, -1, -1 },
135 "i2s", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
136 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
137 .mux = { CGU_REG_CPCCR, 31, 1 },
138 .div = { CGU_REG_I2SCDR, 0, 1, 9, -1, -1, -1 },
139 .gate = { CGU_REG_CLKGR, 6 },
143 "spi", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
144 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL, -1, -1 },
145 .mux = { CGU_REG_SSICDR, 31, 1 },
146 .div = { CGU_REG_SSICDR, 0, 1, 4, -1, -1, -1 },
147 .gate = { CGU_REG_CLKGR, 4 },
151 "mmc", CGU_CLK_DIV | CGU_CLK_GATE,
152 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
153 .div = { CGU_REG_MSCCDR, 0, 1, 5, -1, -1, -1 },
154 .gate = { CGU_REG_CLKGR, 7 },
158 "uhc", CGU_CLK_DIV | CGU_CLK_GATE,
159 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
160 .div = { CGU_REG_UHCCDR, 0, 1, 4, -1, -1, -1 },
161 .gate = { CGU_REG_CLKGR, 14 },
165 "udc", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
166 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
167 .mux = { CGU_REG_CPCCR, 29, 1 },
168 .div = { CGU_REG_CPCCR, 23, 1, 6, -1, -1, -1 },
169 .gate = { CGU_REG_SCR, 6, true },
172 /* Gate-only clocks */
174 [JZ4740_CLK_UART0] = {
175 "uart0", CGU_CLK_GATE,
176 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
177 .gate = { CGU_REG_CLKGR, 0 },
180 [JZ4740_CLK_UART1] = {
181 "uart1", CGU_CLK_GATE,
182 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
183 .gate = { CGU_REG_CLKGR, 15 },
188 .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
189 .gate = { CGU_REG_CLKGR, 12 },
194 .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
195 .gate = { CGU_REG_CLKGR, 13 },
200 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
201 .gate = { CGU_REG_CLKGR, 8 },
206 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
207 .gate = { CGU_REG_CLKGR, 3 },
212 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
213 .gate = { CGU_REG_CLKGR, 5 },
217 static void __init jz4740_cgu_init(struct device_node *np)
221 cgu = ingenic_cgu_new(jz4740_cgu_clocks,
222 ARRAY_SIZE(jz4740_cgu_clocks), np);
224 pr_err("%s: failed to initialise CGU\n", __func__);
228 retval = ingenic_cgu_register_clocks(cgu);
230 pr_err("%s: failed to register CGU Clocks\n", __func__);
232 CLK_OF_DECLARE(jz4740_cgu, "ingenic,jz4740-cgu", jz4740_cgu_init);
234 void jz4740_clock_set_wait_mode(enum jz4740_wait_mode mode)
236 uint32_t lcr = readl(cgu->base + CGU_REG_LCR);
239 case JZ4740_WAIT_MODE_IDLE:
243 case JZ4740_WAIT_MODE_SLEEP:
248 writel(lcr, cgu->base + CGU_REG_LCR);
251 void jz4740_clock_udc_disable_auto_suspend(void)
253 uint32_t clkgr = readl(cgu->base + CGU_REG_CLKGR);
256 writel(clkgr, cgu->base + CGU_REG_CLKGR);
258 EXPORT_SYMBOL_GPL(jz4740_clock_udc_disable_auto_suspend);
260 void jz4740_clock_udc_enable_auto_suspend(void)
262 uint32_t clkgr = readl(cgu->base + CGU_REG_CLKGR);
265 writel(clkgr, cgu->base + CGU_REG_CLKGR);
267 EXPORT_SYMBOL_GPL(jz4740_clock_udc_enable_auto_suspend);
269 #define JZ_CLOCK_GATE_UART0 BIT(0)
270 #define JZ_CLOCK_GATE_TCU BIT(1)
271 #define JZ_CLOCK_GATE_DMAC BIT(12)
273 void jz4740_clock_suspend(void)
275 uint32_t clkgr, cppcr;
277 clkgr = readl(cgu->base + CGU_REG_CLKGR);
278 clkgr |= JZ_CLOCK_GATE_TCU | JZ_CLOCK_GATE_DMAC | JZ_CLOCK_GATE_UART0;
279 writel(clkgr, cgu->base + CGU_REG_CLKGR);
281 cppcr = readl(cgu->base + CGU_REG_CPPCR);
282 cppcr &= ~BIT(jz4740_cgu_clocks[JZ4740_CLK_PLL].pll.enable_bit);
283 writel(cppcr, cgu->base + CGU_REG_CPPCR);
286 void jz4740_clock_resume(void)
288 uint32_t clkgr, cppcr, stable;
290 cppcr = readl(cgu->base + CGU_REG_CPPCR);
291 cppcr |= BIT(jz4740_cgu_clocks[JZ4740_CLK_PLL].pll.enable_bit);
292 writel(cppcr, cgu->base + CGU_REG_CPPCR);
294 stable = BIT(jz4740_cgu_clocks[JZ4740_CLK_PLL].pll.stable_bit);
296 cppcr = readl(cgu->base + CGU_REG_CPPCR);
297 } while (!(cppcr & stable));
299 clkgr = readl(cgu->base + CGU_REG_CLKGR);
300 clkgr &= ~JZ_CLOCK_GATE_TCU;
301 clkgr &= ~JZ_CLOCK_GATE_DMAC;
302 clkgr &= ~JZ_CLOCK_GATE_UART0;
303 writel(clkgr, cgu->base + CGU_REG_CLKGR);