1 /*
2  * SPEAr6xx machines clock framework source file
3  *
4  * Copyright (C) 2012 ST Microelectronics
5  * Viresh Kumar <vireshk@kernel.org>
6  *
7  * This file is licensed under the terms of the GNU General Public
8  * License version 2. This program is licensed "as is" without any
9  * warranty of any kind, whether express or implied.
10  */
11 
12 #include <linux/clkdev.h>
13 #include <linux/io.h>
14 #include <linux/spinlock_types.h>
15 #include "clk.h"
16 
17 static DEFINE_SPINLOCK(_lock);
18 
19 #define PLL1_CTR			(misc_base + 0x008)
20 #define PLL1_FRQ			(misc_base + 0x00C)
21 #define PLL2_CTR			(misc_base + 0x014)
22 #define PLL2_FRQ			(misc_base + 0x018)
23 #define PLL_CLK_CFG			(misc_base + 0x020)
24 	/* PLL_CLK_CFG register masks */
25 	#define MCTR_CLK_SHIFT		28
26 	#define MCTR_CLK_MASK		3
27 
28 #define CORE_CLK_CFG			(misc_base + 0x024)
29 	/* CORE CLK CFG register masks */
30 	#define HCLK_RATIO_SHIFT	10
31 	#define HCLK_RATIO_MASK		2
32 	#define PCLK_RATIO_SHIFT	8
33 	#define PCLK_RATIO_MASK		2
34 
35 #define PERIP_CLK_CFG			(misc_base + 0x028)
36 	/* PERIP_CLK_CFG register masks */
37 	#define CLCD_CLK_SHIFT		2
38 	#define CLCD_CLK_MASK		2
39 	#define UART_CLK_SHIFT		4
40 	#define UART_CLK_MASK		1
41 	#define FIRDA_CLK_SHIFT		5
42 	#define FIRDA_CLK_MASK		2
43 	#define GPT0_CLK_SHIFT		8
44 	#define GPT1_CLK_SHIFT		10
45 	#define GPT2_CLK_SHIFT		11
46 	#define GPT3_CLK_SHIFT		12
47 	#define GPT_CLK_MASK		1
48 
49 #define PERIP1_CLK_ENB			(misc_base + 0x02C)
50 	/* PERIP1_CLK_ENB register masks */
51 	#define UART0_CLK_ENB		3
52 	#define UART1_CLK_ENB		4
53 	#define SSP0_CLK_ENB		5
54 	#define SSP1_CLK_ENB		6
55 	#define I2C_CLK_ENB		7
56 	#define JPEG_CLK_ENB		8
57 	#define FSMC_CLK_ENB		9
58 	#define FIRDA_CLK_ENB		10
59 	#define GPT2_CLK_ENB		11
60 	#define GPT3_CLK_ENB		12
61 	#define GPIO2_CLK_ENB		13
62 	#define SSP2_CLK_ENB		14
63 	#define ADC_CLK_ENB		15
64 	#define GPT1_CLK_ENB		11
65 	#define RTC_CLK_ENB		17
66 	#define GPIO1_CLK_ENB		18
67 	#define DMA_CLK_ENB		19
68 	#define SMI_CLK_ENB		21
69 	#define CLCD_CLK_ENB		22
70 	#define GMAC_CLK_ENB		23
71 	#define USBD_CLK_ENB		24
72 	#define USBH0_CLK_ENB		25
73 	#define USBH1_CLK_ENB		26
74 
75 #define PRSC0_CLK_CFG			(misc_base + 0x044)
76 #define PRSC1_CLK_CFG			(misc_base + 0x048)
77 #define PRSC2_CLK_CFG			(misc_base + 0x04C)
78 
79 #define CLCD_CLK_SYNT			(misc_base + 0x05C)
80 #define FIRDA_CLK_SYNT			(misc_base + 0x060)
81 #define UART_CLK_SYNT			(misc_base + 0x064)
82 
83 /* vco rate configuration table, in ascending order of rates */
84 static struct pll_rate_tbl pll_rtbl[] = {
85 	{.mode = 0, .m = 0x53, .n = 0x0F, .p = 0x1}, /* vco 332 & pll 166 MHz */
86 	{.mode = 0, .m = 0x85, .n = 0x0F, .p = 0x1}, /* vco 532 & pll 266 MHz */
87 	{.mode = 0, .m = 0xA6, .n = 0x0F, .p = 0x1}, /* vco 664 & pll 332 MHz */
88 };
89 
90 /* aux rate configuration table, in ascending order of rates */
91 static struct aux_rate_tbl aux_rtbl[] = {
92 	/* For PLL1 = 332 MHz */
93 	{.xscale = 2, .yscale = 27, .eq = 0}, /* 12.296 MHz */
94 	{.xscale = 2, .yscale = 8, .eq = 0}, /* 41.5 MHz */
95 	{.xscale = 2, .yscale = 4, .eq = 0}, /* 83 MHz */
96 	{.xscale = 1, .yscale = 2, .eq = 1}, /* 166 MHz */
97 };
98 
99 static const char *clcd_parents[] = { "pll3_clk", "clcd_syn_gclk", };
100 static const char *firda_parents[] = { "pll3_clk", "firda_syn_gclk", };
101 static const char *uart_parents[] = { "pll3_clk", "uart_syn_gclk", };
102 static const char *gpt0_1_parents[] = { "pll3_clk", "gpt0_1_syn_clk", };
103 static const char *gpt2_parents[] = { "pll3_clk", "gpt2_syn_clk", };
104 static const char *gpt3_parents[] = { "pll3_clk", "gpt3_syn_clk", };
105 static const char *ddr_parents[] = { "ahb_clk", "ahbmult2_clk", "none",
106 	"pll2_clk", };
107 
108 /* gpt rate configuration table, in ascending order of rates */
109 static struct gpt_rate_tbl gpt_rtbl[] = {
110 	/* For pll1 = 332 MHz */
111 	{.mscale = 4, .nscale = 0}, /* 41.5 MHz */
112 	{.mscale = 2, .nscale = 0}, /* 55.3 MHz */
113 	{.mscale = 1, .nscale = 0}, /* 83 MHz */
114 };
115 
116 void __init spear6xx_clk_init(void __iomem *misc_base)
117 {
118 	struct clk *clk, *clk1;
119 
120 	clk = clk_register_fixed_rate(NULL, "osc_32k_clk", NULL, 0, 32000);
121 	clk_register_clkdev(clk, "osc_32k_clk", NULL);
122 
123 	clk = clk_register_fixed_rate(NULL, "osc_30m_clk", NULL, 0, 30000000);
124 	clk_register_clkdev(clk, "osc_30m_clk", NULL);
125 
126 	/* clock derived from 32 KHz osc clk */
127 	clk = clk_register_gate(NULL, "rtc_spear", "osc_32k_clk", 0,
128 			PERIP1_CLK_ENB, RTC_CLK_ENB, 0, &_lock);
129 	clk_register_clkdev(clk, NULL, "rtc-spear");
130 
131 	/* clock derived from 30 MHz osc clk */
132 	clk = clk_register_fixed_rate(NULL, "pll3_clk", "osc_24m_clk", 0,
133 			48000000);
134 	clk_register_clkdev(clk, "pll3_clk", NULL);
135 
136 	clk = clk_register_vco_pll("vco1_clk", "pll1_clk", NULL, "osc_30m_clk",
137 			0, PLL1_CTR, PLL1_FRQ, pll_rtbl, ARRAY_SIZE(pll_rtbl),
138 			&_lock, &clk1, NULL);
139 	clk_register_clkdev(clk, "vco1_clk", NULL);
140 	clk_register_clkdev(clk1, "pll1_clk", NULL);
141 
142 	clk = clk_register_vco_pll("vco2_clk", "pll2_clk", NULL, "osc_30m_clk",
143 			0, PLL2_CTR, PLL2_FRQ, pll_rtbl, ARRAY_SIZE(pll_rtbl),
144 			&_lock, &clk1, NULL);
145 	clk_register_clkdev(clk, "vco2_clk", NULL);
146 	clk_register_clkdev(clk1, "pll2_clk", NULL);
147 
148 	clk = clk_register_fixed_factor(NULL, "wdt_clk", "osc_30m_clk", 0, 1,
149 			1);
150 	clk_register_clkdev(clk, NULL, "wdt");
151 
152 	/* clock derived from pll1 clk */
153 	clk = clk_register_fixed_factor(NULL, "cpu_clk", "pll1_clk",
154 			CLK_SET_RATE_PARENT, 1, 1);
155 	clk_register_clkdev(clk, "cpu_clk", NULL);
156 
157 	clk = clk_register_divider(NULL, "ahb_clk", "pll1_clk",
158 			CLK_SET_RATE_PARENT, CORE_CLK_CFG, HCLK_RATIO_SHIFT,
159 			HCLK_RATIO_MASK, 0, &_lock);
160 	clk_register_clkdev(clk, "ahb_clk", NULL);
161 
162 	clk = clk_register_aux("uart_syn_clk", "uart_syn_gclk", "pll1_clk", 0,
163 			UART_CLK_SYNT, NULL, aux_rtbl, ARRAY_SIZE(aux_rtbl),
164 			&_lock, &clk1);
165 	clk_register_clkdev(clk, "uart_syn_clk", NULL);
166 	clk_register_clkdev(clk1, "uart_syn_gclk", NULL);
167 
168 	clk = clk_register_mux(NULL, "uart_mclk", uart_parents,
169 			ARRAY_SIZE(uart_parents), CLK_SET_RATE_NO_REPARENT,
170 			PERIP_CLK_CFG, UART_CLK_SHIFT, UART_CLK_MASK, 0,
171 			&_lock);
172 	clk_register_clkdev(clk, "uart_mclk", NULL);
173 
174 	clk = clk_register_gate(NULL, "uart0", "uart_mclk", 0, PERIP1_CLK_ENB,
175 			UART0_CLK_ENB, 0, &_lock);
176 	clk_register_clkdev(clk, NULL, "d0000000.serial");
177 
178 	clk = clk_register_gate(NULL, "uart1", "uart_mclk", 0, PERIP1_CLK_ENB,
179 			UART1_CLK_ENB, 0, &_lock);
180 	clk_register_clkdev(clk, NULL, "d0080000.serial");
181 
182 	clk = clk_register_aux("firda_syn_clk", "firda_syn_gclk", "pll1_clk",
183 			0, FIRDA_CLK_SYNT, NULL, aux_rtbl, ARRAY_SIZE(aux_rtbl),
184 			&_lock, &clk1);
185 	clk_register_clkdev(clk, "firda_syn_clk", NULL);
186 	clk_register_clkdev(clk1, "firda_syn_gclk", NULL);
187 
188 	clk = clk_register_mux(NULL, "firda_mclk", firda_parents,
189 			ARRAY_SIZE(firda_parents), CLK_SET_RATE_NO_REPARENT,
190 			PERIP_CLK_CFG, FIRDA_CLK_SHIFT, FIRDA_CLK_MASK, 0,
191 			&_lock);
192 	clk_register_clkdev(clk, "firda_mclk", NULL);
193 
194 	clk = clk_register_gate(NULL, "firda_clk", "firda_mclk", 0,
195 			PERIP1_CLK_ENB, FIRDA_CLK_ENB, 0, &_lock);
196 	clk_register_clkdev(clk, NULL, "firda");
197 
198 	clk = clk_register_aux("clcd_syn_clk", "clcd_syn_gclk", "pll1_clk",
199 			0, CLCD_CLK_SYNT, NULL, aux_rtbl, ARRAY_SIZE(aux_rtbl),
200 			&_lock, &clk1);
201 	clk_register_clkdev(clk, "clcd_syn_clk", NULL);
202 	clk_register_clkdev(clk1, "clcd_syn_gclk", NULL);
203 
204 	clk = clk_register_mux(NULL, "clcd_mclk", clcd_parents,
205 			ARRAY_SIZE(clcd_parents), CLK_SET_RATE_NO_REPARENT,
206 			PERIP_CLK_CFG, CLCD_CLK_SHIFT, CLCD_CLK_MASK, 0,
207 			&_lock);
208 	clk_register_clkdev(clk, "clcd_mclk", NULL);
209 
210 	clk = clk_register_gate(NULL, "clcd_clk", "clcd_mclk", 0,
211 			PERIP1_CLK_ENB, CLCD_CLK_ENB, 0, &_lock);
212 	clk_register_clkdev(clk, NULL, "clcd");
213 
214 	/* gpt clocks */
215 	clk = clk_register_gpt("gpt0_1_syn_clk", "pll1_clk", 0, PRSC0_CLK_CFG,
216 			gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
217 	clk_register_clkdev(clk, "gpt0_1_syn_clk", NULL);
218 
219 	clk = clk_register_mux(NULL, "gpt0_mclk", gpt0_1_parents,
220 			ARRAY_SIZE(gpt0_1_parents), CLK_SET_RATE_NO_REPARENT,
221 			PERIP_CLK_CFG, GPT0_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
222 	clk_register_clkdev(clk, NULL, "gpt0");
223 
224 	clk = clk_register_mux(NULL, "gpt1_mclk", gpt0_1_parents,
225 			ARRAY_SIZE(gpt0_1_parents), CLK_SET_RATE_NO_REPARENT,
226 			PERIP_CLK_CFG, GPT1_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
227 	clk_register_clkdev(clk, "gpt1_mclk", NULL);
228 
229 	clk = clk_register_gate(NULL, "gpt1_clk", "gpt1_mclk", 0,
230 			PERIP1_CLK_ENB, GPT1_CLK_ENB, 0, &_lock);
231 	clk_register_clkdev(clk, NULL, "gpt1");
232 
233 	clk = clk_register_gpt("gpt2_syn_clk", "pll1_clk", 0, PRSC1_CLK_CFG,
234 			gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
235 	clk_register_clkdev(clk, "gpt2_syn_clk", NULL);
236 
237 	clk = clk_register_mux(NULL, "gpt2_mclk", gpt2_parents,
238 			ARRAY_SIZE(gpt2_parents), CLK_SET_RATE_NO_REPARENT,
239 			PERIP_CLK_CFG, GPT2_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
240 	clk_register_clkdev(clk, "gpt2_mclk", NULL);
241 
242 	clk = clk_register_gate(NULL, "gpt2_clk", "gpt2_mclk", 0,
243 			PERIP1_CLK_ENB, GPT2_CLK_ENB, 0, &_lock);
244 	clk_register_clkdev(clk, NULL, "gpt2");
245 
246 	clk = clk_register_gpt("gpt3_syn_clk", "pll1_clk", 0, PRSC2_CLK_CFG,
247 			gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
248 	clk_register_clkdev(clk, "gpt3_syn_clk", NULL);
249 
250 	clk = clk_register_mux(NULL, "gpt3_mclk", gpt3_parents,
251 			ARRAY_SIZE(gpt3_parents), CLK_SET_RATE_NO_REPARENT,
252 			PERIP_CLK_CFG, GPT3_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
253 	clk_register_clkdev(clk, "gpt3_mclk", NULL);
254 
255 	clk = clk_register_gate(NULL, "gpt3_clk", "gpt3_mclk", 0,
256 			PERIP1_CLK_ENB, GPT3_CLK_ENB, 0, &_lock);
257 	clk_register_clkdev(clk, NULL, "gpt3");
258 
259 	/* clock derived from pll3 clk */
260 	clk = clk_register_gate(NULL, "usbh0_clk", "pll3_clk", 0,
261 			PERIP1_CLK_ENB, USBH0_CLK_ENB, 0, &_lock);
262 	clk_register_clkdev(clk, NULL, "e1800000.ehci");
263 	clk_register_clkdev(clk, NULL, "e1900000.ohci");
264 
265 	clk = clk_register_gate(NULL, "usbh1_clk", "pll3_clk", 0,
266 			PERIP1_CLK_ENB, USBH1_CLK_ENB, 0, &_lock);
267 	clk_register_clkdev(clk, NULL, "e2000000.ehci");
268 	clk_register_clkdev(clk, NULL, "e2100000.ohci");
269 
270 	clk = clk_register_gate(NULL, "usbd_clk", "pll3_clk", 0, PERIP1_CLK_ENB,
271 			USBD_CLK_ENB, 0, &_lock);
272 	clk_register_clkdev(clk, NULL, "designware_udc");
273 
274 	/* clock derived from ahb clk */
275 	clk = clk_register_fixed_factor(NULL, "ahbmult2_clk", "ahb_clk", 0, 2,
276 			1);
277 	clk_register_clkdev(clk, "ahbmult2_clk", NULL);
278 
279 	clk = clk_register_mux(NULL, "ddr_clk", ddr_parents,
280 			ARRAY_SIZE(ddr_parents), CLK_SET_RATE_NO_REPARENT,
281 			PLL_CLK_CFG, MCTR_CLK_SHIFT, MCTR_CLK_MASK, 0, &_lock);
282 	clk_register_clkdev(clk, "ddr_clk", NULL);
283 
284 	clk = clk_register_divider(NULL, "apb_clk", "ahb_clk",
285 			CLK_SET_RATE_PARENT, CORE_CLK_CFG, PCLK_RATIO_SHIFT,
286 			PCLK_RATIO_MASK, 0, &_lock);
287 	clk_register_clkdev(clk, "apb_clk", NULL);
288 
289 	clk = clk_register_gate(NULL, "dma_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
290 			DMA_CLK_ENB, 0, &_lock);
291 	clk_register_clkdev(clk, NULL, "fc400000.dma");
292 
293 	clk = clk_register_gate(NULL, "fsmc_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
294 			FSMC_CLK_ENB, 0, &_lock);
295 	clk_register_clkdev(clk, NULL, "d1800000.flash");
296 
297 	clk = clk_register_gate(NULL, "gmac_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
298 			GMAC_CLK_ENB, 0, &_lock);
299 	clk_register_clkdev(clk, NULL, "e0800000.ethernet");
300 
301 	clk = clk_register_gate(NULL, "i2c_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
302 			I2C_CLK_ENB, 0, &_lock);
303 	clk_register_clkdev(clk, NULL, "d0200000.i2c");
304 
305 	clk = clk_register_gate(NULL, "jpeg_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
306 			JPEG_CLK_ENB, 0, &_lock);
307 	clk_register_clkdev(clk, NULL, "jpeg");
308 
309 	clk = clk_register_gate(NULL, "smi_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
310 			SMI_CLK_ENB, 0, &_lock);
311 	clk_register_clkdev(clk, NULL, "fc000000.flash");
312 
313 	/* clock derived from apb clk */
314 	clk = clk_register_gate(NULL, "adc_clk", "apb_clk", 0, PERIP1_CLK_ENB,
315 			ADC_CLK_ENB, 0, &_lock);
316 	clk_register_clkdev(clk, NULL, "adc");
317 
318 	clk = clk_register_fixed_factor(NULL, "gpio0_clk", "apb_clk", 0, 1, 1);
319 	clk_register_clkdev(clk, NULL, "f0100000.gpio");
320 
321 	clk = clk_register_gate(NULL, "gpio1_clk", "apb_clk", 0, PERIP1_CLK_ENB,
322 			GPIO1_CLK_ENB, 0, &_lock);
323 	clk_register_clkdev(clk, NULL, "fc980000.gpio");
324 
325 	clk = clk_register_gate(NULL, "gpio2_clk", "apb_clk", 0, PERIP1_CLK_ENB,
326 			GPIO2_CLK_ENB, 0, &_lock);
327 	clk_register_clkdev(clk, NULL, "d8100000.gpio");
328 
329 	clk = clk_register_gate(NULL, "ssp0_clk", "apb_clk", 0, PERIP1_CLK_ENB,
330 			SSP0_CLK_ENB, 0, &_lock);
331 	clk_register_clkdev(clk, NULL, "ssp-pl022.0");
332 
333 	clk = clk_register_gate(NULL, "ssp1_clk", "apb_clk", 0, PERIP1_CLK_ENB,
334 			SSP1_CLK_ENB, 0, &_lock);
335 	clk_register_clkdev(clk, NULL, "ssp-pl022.1");
336 
337 	clk = clk_register_gate(NULL, "ssp2_clk", "apb_clk", 0, PERIP1_CLK_ENB,
338 			SSP2_CLK_ENB, 0, &_lock);
339 	clk_register_clkdev(clk, NULL, "ssp-pl022.2");
340 }
341