1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Ingenic JZ4740 SoC CGU driver
5 * Copyright (c) 2015 Imagination Technologies
6 * Author: Paul Burton <paul.burton@mips.com>
9 #include <linux/clk-provider.h>
10 #include <linux/delay.h>
13 #include <dt-bindings/clock/jz4740-cgu.h>
14 #include <asm/mach-jz4740/clock.h>
17 /* CGU register offsets */
18 #define CGU_REG_CPCCR 0x00
19 #define CGU_REG_LCR 0x04
20 #define CGU_REG_CPPCR 0x10
21 #define CGU_REG_CLKGR 0x20
22 #define CGU_REG_SCR 0x24
23 #define CGU_REG_I2SCDR 0x60
24 #define CGU_REG_LPCDR 0x64
25 #define CGU_REG_MSCCDR 0x68
26 #define CGU_REG_UHCCDR 0x6c
27 #define CGU_REG_SSICDR 0x74
29 /* bits within a PLL control register */
30 #define PLLCTL_M_SHIFT 23
31 #define PLLCTL_M_MASK (0x1ff << PLLCTL_M_SHIFT)
32 #define PLLCTL_N_SHIFT 18
33 #define PLLCTL_N_MASK (0x1f << PLLCTL_N_SHIFT)
34 #define PLLCTL_OD_SHIFT 16
35 #define PLLCTL_OD_MASK (0x3 << PLLCTL_OD_SHIFT)
36 #define PLLCTL_STABLE (1 << 10)
37 #define PLLCTL_BYPASS (1 << 9)
38 #define PLLCTL_ENABLE (1 << 8)
40 /* bits within the LCR register */
41 #define LCR_SLEEP (1 << 0)
43 /* bits within the CLKGR register */
44 #define CLKGR_UDC (1 << 11)
46 static struct ingenic_cgu *cgu;
48 static const s8 pll_od_encoding[4] = {
52 static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
56 [JZ4740_CLK_EXT] = { "ext", CGU_CLK_EXT },
57 [JZ4740_CLK_RTC] = { "rtc", CGU_CLK_EXT },
61 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
73 .od_encoding = pll_od_encoding,
80 /* Muxes & dividers */
82 [JZ4740_CLK_PLL_HALF] = {
83 "pll half", CGU_CLK_DIV,
84 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
85 .div = { CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1 },
90 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
91 .div = { CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1 },
96 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
97 .div = { CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1 },
100 [JZ4740_CLK_PCLK] = {
102 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
103 .div = { CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1 },
106 [JZ4740_CLK_MCLK] = {
108 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
109 .div = { CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1 },
113 "lcd", CGU_CLK_DIV | CGU_CLK_GATE,
114 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
115 .div = { CGU_REG_CPCCR, 16, 1, 5, 22, -1, -1 },
116 .gate = { CGU_REG_CLKGR, 10 },
119 [JZ4740_CLK_LCD_PCLK] = {
120 "lcd_pclk", CGU_CLK_DIV,
121 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
122 .div = { CGU_REG_LPCDR, 0, 1, 11, -1, -1, -1 },
126 "i2s", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
127 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
128 .mux = { CGU_REG_CPCCR, 31, 1 },
129 .div = { CGU_REG_I2SCDR, 0, 1, 9, -1, -1, -1 },
130 .gate = { CGU_REG_CLKGR, 6 },
134 "spi", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
135 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL, -1, -1 },
136 .mux = { CGU_REG_SSICDR, 31, 1 },
137 .div = { CGU_REG_SSICDR, 0, 1, 4, -1, -1, -1 },
138 .gate = { CGU_REG_CLKGR, 4 },
142 "mmc", CGU_CLK_DIV | CGU_CLK_GATE,
143 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
144 .div = { CGU_REG_MSCCDR, 0, 1, 5, -1, -1, -1 },
145 .gate = { CGU_REG_CLKGR, 7 },
149 "uhc", CGU_CLK_DIV | CGU_CLK_GATE,
150 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
151 .div = { CGU_REG_UHCCDR, 0, 1, 4, -1, -1, -1 },
152 .gate = { CGU_REG_CLKGR, 14 },
156 "udc", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
157 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
158 .mux = { CGU_REG_CPCCR, 29, 1 },
159 .div = { CGU_REG_CPCCR, 23, 1, 6, -1, -1, -1 },
160 .gate = { CGU_REG_SCR, 6, true },
163 /* Gate-only clocks */
165 [JZ4740_CLK_UART0] = {
166 "uart0", CGU_CLK_GATE,
167 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
168 .gate = { CGU_REG_CLKGR, 0 },
171 [JZ4740_CLK_UART1] = {
172 "uart1", CGU_CLK_GATE,
173 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
174 .gate = { CGU_REG_CLKGR, 15 },
179 .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
180 .gate = { CGU_REG_CLKGR, 12 },
185 .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
186 .gate = { CGU_REG_CLKGR, 13 },
191 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
192 .gate = { CGU_REG_CLKGR, 8 },
197 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
198 .gate = { CGU_REG_CLKGR, 3 },
203 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
204 .gate = { CGU_REG_CLKGR, 5 },
208 static void __init jz4740_cgu_init(struct device_node *np)
212 cgu = ingenic_cgu_new(jz4740_cgu_clocks,
213 ARRAY_SIZE(jz4740_cgu_clocks), np);
215 pr_err("%s: failed to initialise CGU\n", __func__);
219 retval = ingenic_cgu_register_clocks(cgu);
221 pr_err("%s: failed to register CGU Clocks\n", __func__);
223 CLK_OF_DECLARE(jz4740_cgu, "ingenic,jz4740-cgu", jz4740_cgu_init);
225 void jz4740_clock_set_wait_mode(enum jz4740_wait_mode mode)
227 uint32_t lcr = readl(cgu->base + CGU_REG_LCR);
230 case JZ4740_WAIT_MODE_IDLE:
234 case JZ4740_WAIT_MODE_SLEEP:
239 writel(lcr, cgu->base + CGU_REG_LCR);
242 void jz4740_clock_udc_disable_auto_suspend(void)
244 uint32_t clkgr = readl(cgu->base + CGU_REG_CLKGR);
247 writel(clkgr, cgu->base + CGU_REG_CLKGR);
249 EXPORT_SYMBOL_GPL(jz4740_clock_udc_disable_auto_suspend);
251 void jz4740_clock_udc_enable_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_enable_auto_suspend);
260 #define JZ_CLOCK_GATE_UART0 BIT(0)
261 #define JZ_CLOCK_GATE_TCU BIT(1)
262 #define JZ_CLOCK_GATE_DMAC BIT(12)
264 void jz4740_clock_suspend(void)
266 uint32_t clkgr, cppcr;
268 clkgr = readl(cgu->base + CGU_REG_CLKGR);
269 clkgr |= JZ_CLOCK_GATE_TCU | JZ_CLOCK_GATE_DMAC | JZ_CLOCK_GATE_UART0;
270 writel(clkgr, cgu->base + CGU_REG_CLKGR);
272 cppcr = readl(cgu->base + CGU_REG_CPPCR);
273 cppcr &= ~BIT(jz4740_cgu_clocks[JZ4740_CLK_PLL].pll.enable_bit);
274 writel(cppcr, cgu->base + CGU_REG_CPPCR);
277 void jz4740_clock_resume(void)
279 uint32_t clkgr, cppcr, stable;
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);
285 stable = BIT(jz4740_cgu_clocks[JZ4740_CLK_PLL].pll.stable_bit);
287 cppcr = readl(cgu->base + CGU_REG_CPPCR);
288 } while (!(cppcr & stable));
290 clkgr = readl(cgu->base + CGU_REG_CLKGR);
291 clkgr &= ~JZ_CLOCK_GATE_TCU;
292 clkgr &= ~JZ_CLOCK_GATE_DMAC;
293 clkgr &= ~JZ_CLOCK_GATE_UART0;
294 writel(clkgr, cgu->base + CGU_REG_CLKGR);