xref: /openbmc/u-boot/arch/arm/mach-imx/mx7ulp/pcc.c (revision abddcd52) 
1 /*
2  * Copyright (C) 2016 Freescale Semiconductor, Inc.
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <div64.h>
9 #include <asm/io.h>
10 #include <errno.h>
11 #include <asm/arch/imx-regs.h>
12 #include <asm/arch/pcc.h>
13 #include <asm/arch/sys_proto.h>
14 
15 DECLARE_GLOBAL_DATA_PTR;
16 
17 #define PCC_CLKSRC_TYPES 2
18 #define PCC_CLKSRC_NUM 7
19 
20 static enum scg_clk pcc_clksrc[PCC_CLKSRC_TYPES][PCC_CLKSRC_NUM] = {
21 	{	SCG_NIC1_BUS_CLK,
22 		SCG_NIC1_CLK,
23 		SCG_DDR_CLK,
24 		SCG_APLL_PFD2_CLK,
25 		SCG_APLL_PFD1_CLK,
26 		SCG_APLL_PFD0_CLK,
27 		USB_PLL_OUT,
28 	},
29 	{	SCG_SOSC_DIV2_CLK,  /* SOSC BUS clock */
30 		MIPI_PLL_OUT,
31 		SCG_FIRC_DIV2_CLK,  /* FIRC BUS clock */
32 		SCG_ROSC_CLK,
33 		SCG_NIC1_BUS_CLK,
34 		SCG_NIC1_CLK,
35 		SCG_APLL_PFD3_CLK,
36 	},
37 };
38 
39 static struct pcc_entry pcc_arrays[] = {
40 	{PCC2_RBASE, DMA1_PCC2_SLOT,		CLKSRC_NO_PCS, PCC_NO_DIV},
41 	{PCC2_RBASE, RGPIO1_PCC2_SLOT,		CLKSRC_NO_PCS, PCC_NO_DIV},
42 	{PCC2_RBASE, FLEXBUS0_PCC2_SLOT,	CLKSRC_NO_PCS, PCC_NO_DIV},
43 	{PCC2_RBASE, SEMA42_1_PCC2_SLOT,	CLKSRC_NO_PCS, PCC_NO_DIV},
44 	{PCC2_RBASE, DMA1_CH_MUX0_PCC2_SLOT,	CLKSRC_NO_PCS, PCC_NO_DIV},
45 	{PCC2_RBASE, SNVS_PCC2_SLOT,		CLKSRC_NO_PCS, PCC_NO_DIV},
46 	{PCC2_RBASE, CAAM_PCC2_SLOT,		CLKSRC_NO_PCS, PCC_NO_DIV},
47 	{PCC2_RBASE, LPTPM4_PCC2_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
48 	{PCC2_RBASE, LPTPM5_PCC2_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
49 	{PCC2_RBASE, LPIT1_PCC2_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
50 	{PCC2_RBASE, LPSPI2_PCC2_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
51 	{PCC2_RBASE, LPSPI3_PCC2_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
52 	{PCC2_RBASE, LPI2C4_PCC2_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
53 	{PCC2_RBASE, LPI2C5_PCC2_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
54 	{PCC2_RBASE, LPUART4_PCC2_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
55 	{PCC2_RBASE, LPUART5_PCC2_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
56 	{PCC2_RBASE, FLEXIO1_PCC2_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
57 	{PCC2_RBASE, USBOTG0_PCC2_SLOT,		CLKSRC_PER_PLAT, PCC_HAS_DIV},
58 	{PCC2_RBASE, USBOTG1_PCC2_SLOT,		CLKSRC_PER_PLAT, PCC_HAS_DIV},
59 	{PCC2_RBASE, USBPHY_PCC2_SLOT,		CLKSRC_NO_PCS, PCC_NO_DIV},
60 	{PCC2_RBASE, USB_PL301_PCC2_SLOT,	CLKSRC_NO_PCS, PCC_NO_DIV},
61 	{PCC2_RBASE, USDHC0_PCC2_SLOT,		CLKSRC_PER_PLAT, PCC_HAS_DIV},
62 	{PCC2_RBASE, USDHC1_PCC2_SLOT,		CLKSRC_PER_PLAT, PCC_HAS_DIV},
63 	{PCC2_RBASE, WDG1_PCC2_SLOT,		CLKSRC_PER_BUS,	PCC_HAS_DIV},
64 	{PCC2_RBASE, WDG2_PCC2_SLOT,		CLKSRC_PER_BUS, PCC_HAS_DIV},
65 
66 	{PCC3_RBASE, LPTPM6_PCC3_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
67 	{PCC3_RBASE, LPTPM7_PCC3_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
68 	{PCC3_RBASE, LPI2C6_PCC3_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
69 	{PCC3_RBASE, LPI2C7_PCC3_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
70 	{PCC3_RBASE, LPUART6_PCC3_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
71 	{PCC3_RBASE, LPUART7_PCC3_SLOT,		CLKSRC_PER_BUS, PCC_NO_DIV},
72 	{PCC3_RBASE, VIU0_PCC3_SLOT,		CLKSRC_NO_PCS, PCC_NO_DIV},
73 	{PCC3_RBASE, DSI0_PCC3_SLOT,		CLKSRC_PER_BUS, PCC_HAS_DIV},
74 	{PCC3_RBASE, LCDIF0_PCC3_SLOT,		CLKSRC_PER_PLAT, PCC_HAS_DIV},
75 	{PCC3_RBASE, MMDC0_PCC3_SLOT,		CLKSRC_NO_PCS, PCC_NO_DIV},
76 	{PCC3_RBASE, PORTC_PCC3_SLOT,		CLKSRC_NO_PCS, PCC_NO_DIV},
77 	{PCC3_RBASE, PORTD_PCC3_SLOT,		CLKSRC_NO_PCS, PCC_NO_DIV},
78 	{PCC3_RBASE, PORTE_PCC3_SLOT,		CLKSRC_NO_PCS, PCC_NO_DIV},
79 	{PCC3_RBASE, PORTF_PCC3_SLOT,		CLKSRC_NO_PCS, PCC_NO_DIV},
80 	{PCC3_RBASE, GPU3D_PCC3_SLOT,		CLKSRC_PER_PLAT, PCC_NO_DIV},
81 	{PCC3_RBASE, GPU2D_PCC3_SLOT,		CLKSRC_PER_PLAT, PCC_NO_DIV},
82 };
83 
84 int pcc_clock_enable(enum pcc_clk clk, bool enable)
85 {
86 	u32 reg, val;
87 
88 	if (clk >= ARRAY_SIZE(pcc_arrays))
89 		return -EINVAL;
90 
91 	reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
92 
93 	val = readl(reg);
94 
95 	clk_debug("pcc_clock_enable: clk %d, reg 0x%x, val 0x%x, enable %d\n",
96 		  clk, reg, val, enable);
97 
98 	if (!(val & PCC_PR_MASK) || (val & PCC_INUSE_MASK))
99 		return -EPERM;
100 
101 	if (enable)
102 		val |= PCC_CGC_MASK;
103 	else
104 		val &= ~PCC_CGC_MASK;
105 
106 	writel(val, reg);
107 
108 	clk_debug("pcc_clock_enable: val 0x%x\n", val);
109 
110 	return 0;
111 }
112 
113 /* The clock source select needs clock is disabled */
114 int pcc_clock_sel(enum pcc_clk clk, enum scg_clk src)
115 {
116 	u32 reg, val, i, clksrc_type;
117 
118 	if (clk >= ARRAY_SIZE(pcc_arrays))
119 		return -EINVAL;
120 
121 	clksrc_type = pcc_arrays[clk].clksrc;
122 	if (clksrc_type >= CLKSRC_NO_PCS) {
123 		printf("No PCS field for the PCC %d, clksrc type %d\n",
124 		       clk, clksrc_type);
125 		return -EPERM;
126 	}
127 
128 	for (i = 0; i < PCC_CLKSRC_NUM; i++) {
129 		if (pcc_clksrc[clksrc_type][i] == src) {
130 			/* Find the clock src, then set it to PCS */
131 			break;
132 		}
133 	}
134 
135 	if (i == PCC_CLKSRC_NUM) {
136 		printf("Not find the parent scg_clk in PCS of PCC %d, invalid scg_clk %d\n", clk, src);
137 		return -EINVAL;
138 	}
139 
140 	reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
141 
142 	val = readl(reg);
143 
144 	clk_debug("pcc_clock_sel: clk %d, reg 0x%x, val 0x%x, clksrc_type %d\n",
145 		  clk, reg, val, clksrc_type);
146 
147 	if (!(val & PCC_PR_MASK) || (val & PCC_INUSE_MASK) ||
148 	    (val & PCC_CGC_MASK)) {
149 		printf("Not permit to select clock source val = 0x%x\n", val);
150 		return -EPERM;
151 	}
152 
153 	val &= ~PCC_PCS_MASK;
154 	val |= ((i + 1) << PCC_PCS_OFFSET);
155 
156 	writel(val, reg);
157 
158 	clk_debug("pcc_clock_sel: val 0x%x\n", val);
159 
160 	return 0;
161 }
162 
163 int pcc_clock_div_config(enum pcc_clk clk, bool frac, u8 div)
164 {
165 	u32 reg, val;
166 
167 	if (clk >= ARRAY_SIZE(pcc_arrays) || div > 8 ||
168 	    (div == 1 && frac != 0))
169 		return -EINVAL;
170 
171 	if (pcc_arrays[clk].div >= PCC_NO_DIV) {
172 		printf("No DIV/FRAC field for the PCC %d\n", clk);
173 		return -EPERM;
174 	}
175 
176 	reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
177 
178 	val = readl(reg);
179 
180 	if (!(val & PCC_PR_MASK) || (val & PCC_INUSE_MASK) ||
181 	    (val & PCC_CGC_MASK)) {
182 		printf("Not permit to set div/frac val = 0x%x\n", val);
183 		return -EPERM;
184 	}
185 
186 	if (frac)
187 		val |= PCC_FRAC_MASK;
188 	else
189 		val &= ~PCC_FRAC_MASK;
190 
191 	val &= ~PCC_PCD_MASK;
192 	val |= (div - 1) & PCC_PCD_MASK;
193 
194 	writel(val, reg);
195 
196 	return 0;
197 }
198 
199 bool pcc_clock_is_enable(enum pcc_clk clk)
200 {
201 	u32 reg, val;
202 
203 	if (clk >= ARRAY_SIZE(pcc_arrays))
204 		return -EINVAL;
205 
206 	reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
207 	val = readl(reg);
208 
209 	if ((val & PCC_INUSE_MASK) || (val & PCC_CGC_MASK))
210 		return true;
211 
212 	return false;
213 }
214 
215 int pcc_clock_get_clksrc(enum pcc_clk clk, enum scg_clk *src)
216 {
217 	u32 reg, val, clksrc_type;
218 
219 	if (clk >= ARRAY_SIZE(pcc_arrays))
220 		return -EINVAL;
221 
222 	clksrc_type = pcc_arrays[clk].clksrc;
223 	if (clksrc_type >= CLKSRC_NO_PCS) {
224 		printf("No PCS field for the PCC %d, clksrc type %d\n",
225 		       clk, clksrc_type);
226 		return -EPERM;
227 	}
228 
229 	reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
230 
231 	val = readl(reg);
232 
233 	clk_debug("pcc_clock_get_clksrc: clk %d, reg 0x%x, val 0x%x, type %d\n",
234 		  clk, reg, val, clksrc_type);
235 
236 	if (!(val & PCC_PR_MASK)) {
237 		printf("This pcc slot is not present = 0x%x\n", val);
238 		return -EPERM;
239 	}
240 
241 	val &= PCC_PCS_MASK;
242 	val = (val >> PCC_PCS_OFFSET);
243 
244 	if (!val) {
245 		printf("Clock source is off\n");
246 		return -EIO;
247 	}
248 
249 	*src = pcc_clksrc[clksrc_type][val - 1];
250 
251 	clk_debug("pcc_clock_get_clksrc: parent scg clk %d\n", *src);
252 
253 	return 0;
254 }
255 
256 u32 pcc_clock_get_rate(enum pcc_clk clk)
257 {
258 	u32 reg, val, rate, frac, div;
259 	enum scg_clk parent;
260 	int ret;
261 
262 	ret = pcc_clock_get_clksrc(clk, &parent);
263 	if (ret)
264 		return 0;
265 
266 	rate = scg_clk_get_rate(parent);
267 
268 	clk_debug("pcc_clock_get_rate: parent rate %u\n", rate);
269 
270 	if (pcc_arrays[clk].div == PCC_HAS_DIV) {
271 		reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
272 		val = readl(reg);
273 
274 		frac = (val & PCC_FRAC_MASK) >> PCC_FRAC_OFFSET;
275 		div = (val & PCC_PCD_MASK) >> PCC_PCD_OFFSET;
276 
277 		/*
278 		 * Theoretically don't have overflow in the calc,
279 		 * the rate won't exceed 2G
280 		 */
281 		rate = rate * (frac + 1) / (div + 1);
282 	}
283 
284 	clk_debug("pcc_clock_get_rate: rate %u\n", rate);
285 	return rate;
286 }
287