xref: /linux/drivers/clk/spear/spear6xx_clock.c (revision 7ae9fb1b7ecbb5d85d07857943f677fd1a559b18)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * SPEAr6xx machines clock framework source file
4  *
5  * Copyright (C) 2012 ST Microelectronics
6  * Viresh Kumar <vireshk@kernel.org>
7  */
8 
9 #include <linux/clkdev.h>
10 #include <linux/clk/spear.h>
11 #include <linux/io.h>
12 #include <linux/spinlock_types.h>
13 #include "clk.h"
14 
15 static DEFINE_SPINLOCK(_lock);
16 
17 #define PLL1_CTR			(misc_base + 0x008)
18 #define PLL1_FRQ			(misc_base + 0x00C)
19 #define PLL2_CTR			(misc_base + 0x014)
20 #define PLL2_FRQ			(misc_base + 0x018)
21 #define PLL_CLK_CFG			(misc_base + 0x020)
22 	/* PLL_CLK_CFG register masks */
23 	#define MCTR_CLK_SHIFT		28
24 	#define MCTR_CLK_MASK		3
25 
26 #define CORE_CLK_CFG			(misc_base + 0x024)
27 	/* CORE CLK CFG register masks */
28 	#define HCLK_RATIO_SHIFT	10
29 	#define HCLK_RATIO_MASK		2
30 	#define PCLK_RATIO_SHIFT	8
31 	#define PCLK_RATIO_MASK		2
32 
33 #define PERIP_CLK_CFG			(misc_base + 0x028)
34 	/* PERIP_CLK_CFG register masks */
35 	#define CLCD_CLK_SHIFT		2
36 	#define CLCD_CLK_MASK		2
37 	#define UART_CLK_SHIFT		4
38 	#define UART_CLK_MASK		1
39 	#define FIRDA_CLK_SHIFT		5
40 	#define FIRDA_CLK_MASK		2
41 	#define GPT0_CLK_SHIFT		8
42 	#define GPT1_CLK_SHIFT		10
43 	#define GPT2_CLK_SHIFT		11
44 	#define GPT3_CLK_SHIFT		12
45 	#define GPT_CLK_MASK		1
46 
47 #define PERIP1_CLK_ENB			(misc_base + 0x02C)
48 	/* PERIP1_CLK_ENB register masks */
49 	#define UART0_CLK_ENB		3
50 	#define UART1_CLK_ENB		4
51 	#define SSP0_CLK_ENB		5
52 	#define SSP1_CLK_ENB		6
53 	#define I2C_CLK_ENB		7
54 	#define JPEG_CLK_ENB		8
55 	#define FSMC_CLK_ENB		9
56 	#define FIRDA_CLK_ENB		10
57 	#define GPT2_CLK_ENB		11
58 	#define GPT3_CLK_ENB		12
59 	#define GPIO2_CLK_ENB		13
60 	#define SSP2_CLK_ENB		14
61 	#define ADC_CLK_ENB		15
62 	#define GPT1_CLK_ENB		11
63 	#define RTC_CLK_ENB		17
64 	#define GPIO1_CLK_ENB		18
65 	#define DMA_CLK_ENB		19
66 	#define SMI_CLK_ENB		21
67 	#define CLCD_CLK_ENB		22
68 	#define GMAC_CLK_ENB		23
69 	#define USBD_CLK_ENB		24
70 	#define USBH0_CLK_ENB		25
71 	#define USBH1_CLK_ENB		26
72 
73 #define PRSC0_CLK_CFG			(misc_base + 0x044)
74 #define PRSC1_CLK_CFG			(misc_base + 0x048)
75 #define PRSC2_CLK_CFG			(misc_base + 0x04C)
76 
77 #define CLCD_CLK_SYNT			(misc_base + 0x05C)
78 #define FIRDA_CLK_SYNT			(misc_base + 0x060)
79 #define UART_CLK_SYNT			(misc_base + 0x064)
80 
81 /* vco rate configuration table, in ascending order of rates */
82 static struct pll_rate_tbl pll_rtbl[] = {
83 	{.mode = 0, .m = 0x53, .n = 0x0F, .p = 0x1}, /* vco 332 & pll 166 MHz */
84 	{.mode = 0, .m = 0x85, .n = 0x0F, .p = 0x1}, /* vco 532 & pll 266 MHz */
85 	{.mode = 0, .m = 0xA6, .n = 0x0F, .p = 0x1}, /* vco 664 & pll 332 MHz */
86 };
87 
88 /* aux rate configuration table, in ascending order of rates */
89 static struct aux_rate_tbl aux_rtbl[] = {
90 	/* For PLL1 = 332 MHz */
91 	{.xscale = 2, .yscale = 27, .eq = 0}, /* 12.296 MHz */
92 	{.xscale = 2, .yscale = 8, .eq = 0}, /* 41.5 MHz */
93 	{.xscale = 2, .yscale = 4, .eq = 0}, /* 83 MHz */
94 	{.xscale = 1, .yscale = 2, .eq = 1}, /* 166 MHz */
95 };
96 
97 static const char *clcd_parents[] = { "pll3_clk", "clcd_syn_gclk", };
98 static const char *firda_parents[] = { "pll3_clk", "firda_syn_gclk", };
99 static const char *uart_parents[] = { "pll3_clk", "uart_syn_gclk", };
100 static const char *gpt0_1_parents[] = { "pll3_clk", "gpt0_1_syn_clk", };
101 static const char *gpt2_parents[] = { "pll3_clk", "gpt2_syn_clk", };
102 static const char *gpt3_parents[] = { "pll3_clk", "gpt3_syn_clk", };
103 static const char *ddr_parents[] = { "ahb_clk", "ahbmult2_clk", "none",
104 	"pll2_clk", };
105 
106 /* gpt rate configuration table, in ascending order of rates */
107 static struct gpt_rate_tbl gpt_rtbl[] = {
108 	/* For pll1 = 332 MHz */
109 	{.mscale = 4, .nscale = 0}, /* 41.5 MHz */
110 	{.mscale = 2, .nscale = 0}, /* 55.3 MHz */
111 	{.mscale = 1, .nscale = 0}, /* 83 MHz */
112 };
113 
spear6xx_clk_init(void __iomem * misc_base)114 void __init spear6xx_clk_init(void __iomem *misc_base)
115 {
116 	struct clk *clk, *clk1;
117 
118 	clk = clk_register_fixed_rate(NULL, "osc_32k_clk", NULL, 0, 32000);
119 	clk_register_clkdev(clk, "osc_32k_clk", NULL);
120 
121 	clk = clk_register_fixed_rate(NULL, "osc_30m_clk", NULL, 0, 30000000);
122 	clk_register_clkdev(clk, "osc_30m_clk", NULL);
123 
124 	/* clock derived from 32 KHz osc clk */
125 	clk = clk_register_gate(NULL, "rtc_spear", "osc_32k_clk", 0,
126 			PERIP1_CLK_ENB, RTC_CLK_ENB, 0, &_lock);
127 	clk_register_clkdev(clk, NULL, "rtc-spear");
128 
129 	/* clock derived from 30 MHz osc clk */
130 	clk = clk_register_fixed_rate(NULL, "pll3_clk", "osc_24m_clk", 0,
131 			48000000);
132 	clk_register_clkdev(clk, "pll3_clk", NULL);
133 
134 	clk = clk_register_vco_pll("vco1_clk", "pll1_clk", NULL, "osc_30m_clk",
135 			0, PLL1_CTR, PLL1_FRQ, pll_rtbl, ARRAY_SIZE(pll_rtbl),
136 			&_lock, &clk1, NULL);
137 	clk_register_clkdev(clk, "vco1_clk", NULL);
138 	clk_register_clkdev(clk1, "pll1_clk", NULL);
139 
140 	clk = clk_register_vco_pll("vco2_clk", "pll2_clk", NULL, "osc_30m_clk",
141 			0, PLL2_CTR, PLL2_FRQ, pll_rtbl, ARRAY_SIZE(pll_rtbl),
142 			&_lock, &clk1, NULL);
143 	clk_register_clkdev(clk, "vco2_clk", NULL);
144 	clk_register_clkdev(clk1, "pll2_clk", NULL);
145 
146 	clk = clk_register_fixed_factor(NULL, "wdt_clk", "osc_30m_clk", 0, 1,
147 			1);
148 	clk_register_clkdev(clk, NULL, "fc880000.wdt");
149 
150 	/* clock derived from pll1 clk */
151 	clk = clk_register_fixed_factor(NULL, "cpu_clk", "pll1_clk",
152 			CLK_SET_RATE_PARENT, 1, 1);
153 	clk_register_clkdev(clk, "cpu_clk", NULL);
154 
155 	clk = clk_register_divider(NULL, "ahb_clk", "pll1_clk",
156 			CLK_SET_RATE_PARENT, CORE_CLK_CFG, HCLK_RATIO_SHIFT,
157 			HCLK_RATIO_MASK, 0, &_lock);
158 	clk_register_clkdev(clk, "ahb_clk", NULL);
159 
160 	clk = clk_register_aux("uart_syn_clk", "uart_syn_gclk", "pll1_clk", 0,
161 			UART_CLK_SYNT, NULL, aux_rtbl, ARRAY_SIZE(aux_rtbl),
162 			&_lock, &clk1);
163 	clk_register_clkdev(clk, "uart_syn_clk", NULL);
164 	clk_register_clkdev(clk1, "uart_syn_gclk", NULL);
165 
166 	clk = clk_register_mux(NULL, "uart_mclk", uart_parents,
167 			ARRAY_SIZE(uart_parents), CLK_SET_RATE_NO_REPARENT,
168 			PERIP_CLK_CFG, UART_CLK_SHIFT, UART_CLK_MASK, 0,
169 			&_lock);
170 	clk_register_clkdev(clk, "uart_mclk", NULL);
171 
172 	clk = clk_register_gate(NULL, "uart0", "uart_mclk", 0, PERIP1_CLK_ENB,
173 			UART0_CLK_ENB, 0, &_lock);
174 	clk_register_clkdev(clk, NULL, "d0000000.serial");
175 
176 	clk = clk_register_gate(NULL, "uart1", "uart_mclk", 0, PERIP1_CLK_ENB,
177 			UART1_CLK_ENB, 0, &_lock);
178 	clk_register_clkdev(clk, NULL, "d0080000.serial");
179 
180 	clk = clk_register_aux("firda_syn_clk", "firda_syn_gclk", "pll1_clk",
181 			0, FIRDA_CLK_SYNT, NULL, aux_rtbl, ARRAY_SIZE(aux_rtbl),
182 			&_lock, &clk1);
183 	clk_register_clkdev(clk, "firda_syn_clk", NULL);
184 	clk_register_clkdev(clk1, "firda_syn_gclk", NULL);
185 
186 	clk = clk_register_mux(NULL, "firda_mclk", firda_parents,
187 			ARRAY_SIZE(firda_parents), CLK_SET_RATE_NO_REPARENT,
188 			PERIP_CLK_CFG, FIRDA_CLK_SHIFT, FIRDA_CLK_MASK, 0,
189 			&_lock);
190 	clk_register_clkdev(clk, "firda_mclk", NULL);
191 
192 	clk = clk_register_gate(NULL, "firda_clk", "firda_mclk", 0,
193 			PERIP1_CLK_ENB, FIRDA_CLK_ENB, 0, &_lock);
194 	clk_register_clkdev(clk, NULL, "firda");
195 
196 	clk = clk_register_aux("clcd_syn_clk", "clcd_syn_gclk", "pll1_clk",
197 			0, CLCD_CLK_SYNT, NULL, aux_rtbl, ARRAY_SIZE(aux_rtbl),
198 			&_lock, &clk1);
199 	clk_register_clkdev(clk, "clcd_syn_clk", NULL);
200 	clk_register_clkdev(clk1, "clcd_syn_gclk", NULL);
201 
202 	clk = clk_register_mux(NULL, "clcd_mclk", clcd_parents,
203 			ARRAY_SIZE(clcd_parents), CLK_SET_RATE_NO_REPARENT,
204 			PERIP_CLK_CFG, CLCD_CLK_SHIFT, CLCD_CLK_MASK, 0,
205 			&_lock);
206 	clk_register_clkdev(clk, "clcd_mclk", NULL);
207 
208 	clk = clk_register_gate(NULL, "clcd_clk", "clcd_mclk", 0,
209 			PERIP1_CLK_ENB, CLCD_CLK_ENB, 0, &_lock);
210 	clk_register_clkdev(clk, NULL, "fc200000.clcd");
211 
212 	/* gpt clocks */
213 	clk = clk_register_gpt("gpt0_1_syn_clk", "pll1_clk", 0, PRSC0_CLK_CFG,
214 			gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
215 	clk_register_clkdev(clk, "gpt0_1_syn_clk", NULL);
216 
217 	clk = clk_register_mux(NULL, "gpt0_mclk", gpt0_1_parents,
218 			ARRAY_SIZE(gpt0_1_parents), CLK_SET_RATE_NO_REPARENT,
219 			PERIP_CLK_CFG, GPT0_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
220 	clk_register_clkdev(clk, NULL, "gpt0");
221 
222 	clk = clk_register_mux(NULL, "gpt1_mclk", gpt0_1_parents,
223 			ARRAY_SIZE(gpt0_1_parents), CLK_SET_RATE_NO_REPARENT,
224 			PERIP_CLK_CFG, GPT1_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
225 	clk_register_clkdev(clk, "gpt1_mclk", NULL);
226 
227 	clk = clk_register_gate(NULL, "gpt1_clk", "gpt1_mclk", 0,
228 			PERIP1_CLK_ENB, GPT1_CLK_ENB, 0, &_lock);
229 	clk_register_clkdev(clk, NULL, "gpt1");
230 
231 	clk = clk_register_gpt("gpt2_syn_clk", "pll1_clk", 0, PRSC1_CLK_CFG,
232 			gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
233 	clk_register_clkdev(clk, "gpt2_syn_clk", NULL);
234 
235 	clk = clk_register_mux(NULL, "gpt2_mclk", gpt2_parents,
236 			ARRAY_SIZE(gpt2_parents), CLK_SET_RATE_NO_REPARENT,
237 			PERIP_CLK_CFG, GPT2_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
238 	clk_register_clkdev(clk, "gpt2_mclk", NULL);
239 
240 	clk = clk_register_gate(NULL, "gpt2_clk", "gpt2_mclk", 0,
241 			PERIP1_CLK_ENB, GPT2_CLK_ENB, 0, &_lock);
242 	clk_register_clkdev(clk, NULL, "gpt2");
243 
244 	clk = clk_register_gpt("gpt3_syn_clk", "pll1_clk", 0, PRSC2_CLK_CFG,
245 			gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
246 	clk_register_clkdev(clk, "gpt3_syn_clk", NULL);
247 
248 	clk = clk_register_mux(NULL, "gpt3_mclk", gpt3_parents,
249 			ARRAY_SIZE(gpt3_parents), CLK_SET_RATE_NO_REPARENT,
250 			PERIP_CLK_CFG, GPT3_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
251 	clk_register_clkdev(clk, "gpt3_mclk", NULL);
252 
253 	clk = clk_register_gate(NULL, "gpt3_clk", "gpt3_mclk", 0,
254 			PERIP1_CLK_ENB, GPT3_CLK_ENB, 0, &_lock);
255 	clk_register_clkdev(clk, NULL, "gpt3");
256 
257 	/* clock derived from pll3 clk */
258 	clk = clk_register_gate(NULL, "usbh0_clk", "pll3_clk", 0,
259 			PERIP1_CLK_ENB, USBH0_CLK_ENB, 0, &_lock);
260 	clk_register_clkdev(clk, NULL, "e1800000.ehci");
261 	clk_register_clkdev(clk, NULL, "e1900000.ohci");
262 
263 	clk = clk_register_gate(NULL, "usbh1_clk", "pll3_clk", 0,
264 			PERIP1_CLK_ENB, USBH1_CLK_ENB, 0, &_lock);
265 	clk_register_clkdev(clk, NULL, "e2000000.ehci");
266 	clk_register_clkdev(clk, NULL, "e2100000.ohci");
267 
268 	clk = clk_register_gate(NULL, "usbd_clk", "pll3_clk", 0, PERIP1_CLK_ENB,
269 			USBD_CLK_ENB, 0, &_lock);
270 	clk_register_clkdev(clk, NULL, "designware_udc");
271 
272 	/* clock derived from ahb clk */
273 	clk = clk_register_fixed_factor(NULL, "ahbmult2_clk", "ahb_clk", 0, 2,
274 			1);
275 	clk_register_clkdev(clk, "ahbmult2_clk", NULL);
276 
277 	clk = clk_register_mux(NULL, "ddr_clk", ddr_parents,
278 			ARRAY_SIZE(ddr_parents), CLK_SET_RATE_NO_REPARENT,
279 			PLL_CLK_CFG, MCTR_CLK_SHIFT, MCTR_CLK_MASK, 0, &_lock);
280 	clk_register_clkdev(clk, "ddr_clk", NULL);
281 
282 	clk = clk_register_divider(NULL, "apb_clk", "ahb_clk",
283 			CLK_SET_RATE_PARENT, CORE_CLK_CFG, PCLK_RATIO_SHIFT,
284 			PCLK_RATIO_MASK, 0, &_lock);
285 	clk_register_clkdev(clk, "apb_clk", NULL);
286 
287 	clk = clk_register_gate(NULL, "dma_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
288 			DMA_CLK_ENB, 0, &_lock);
289 	clk_register_clkdev(clk, NULL, "fc400000.dma");
290 
291 	clk = clk_register_gate(NULL, "fsmc_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
292 			FSMC_CLK_ENB, 0, &_lock);
293 	clk_register_clkdev(clk, NULL, "d1800000.flash");
294 
295 	clk = clk_register_gate(NULL, "gmac_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
296 			GMAC_CLK_ENB, 0, &_lock);
297 	clk_register_clkdev(clk, NULL, "e0800000.ethernet");
298 
299 	clk = clk_register_gate(NULL, "i2c_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
300 			I2C_CLK_ENB, 0, &_lock);
301 	clk_register_clkdev(clk, NULL, "d0200000.i2c");
302 
303 	clk = clk_register_gate(NULL, "jpeg_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
304 			JPEG_CLK_ENB, 0, &_lock);
305 	clk_register_clkdev(clk, NULL, "jpeg");
306 
307 	clk = clk_register_gate(NULL, "smi_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
308 			SMI_CLK_ENB, 0, &_lock);
309 	clk_register_clkdev(clk, NULL, "fc000000.flash");
310 
311 	/* clock derived from apb clk */
312 	clk = clk_register_gate(NULL, "adc_clk", "apb_clk", 0, PERIP1_CLK_ENB,
313 			ADC_CLK_ENB, 0, &_lock);
314 	clk_register_clkdev(clk, NULL, "d820b000.adc");
315 
316 	clk = clk_register_fixed_factor(NULL, "gpio0_clk", "apb_clk", 0, 1, 1);
317 	clk_register_clkdev(clk, NULL, "f0100000.gpio");
318 
319 	clk = clk_register_gate(NULL, "gpio1_clk", "apb_clk", 0, PERIP1_CLK_ENB,
320 			GPIO1_CLK_ENB, 0, &_lock);
321 	clk_register_clkdev(clk, NULL, "fc980000.gpio");
322 
323 	clk = clk_register_gate(NULL, "gpio2_clk", "apb_clk", 0, PERIP1_CLK_ENB,
324 			GPIO2_CLK_ENB, 0, &_lock);
325 	clk_register_clkdev(clk, NULL, "d8100000.gpio");
326 
327 	clk = clk_register_gate(NULL, "ssp0_clk", "apb_clk", 0, PERIP1_CLK_ENB,
328 			SSP0_CLK_ENB, 0, &_lock);
329 	clk_register_clkdev(clk, NULL, "d0100000.spi");
330 
331 	clk = clk_register_gate(NULL, "ssp1_clk", "apb_clk", 0, PERIP1_CLK_ENB,
332 			SSP1_CLK_ENB, 0, &_lock);
333 	clk_register_clkdev(clk, NULL, "d0180000.spi");
334 
335 	clk = clk_register_gate(NULL, "ssp2_clk", "apb_clk", 0, PERIP1_CLK_ENB,
336 			SSP2_CLK_ENB, 0, &_lock);
337 	clk_register_clkdev(clk, NULL, "d8180000.spi");
338 }
339