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ca2e90ac HS |
1 | /* |
2 | * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Common Clock Framework support for S3C2412 and S3C2413. | |
9 | */ | |
10 | ||
ca2e90ac HS |
11 | #include <linux/clk-provider.h> |
12 | #include <linux/of.h> | |
13 | #include <linux/of_address.h> | |
14 | #include <linux/syscore_ops.h> | |
e317c194 | 15 | #include <linux/reboot.h> |
ca2e90ac HS |
16 | |
17 | #include <dt-bindings/clock/s3c2412.h> | |
18 | ||
19 | #include "clk.h" | |
20 | #include "clk-pll.h" | |
21 | ||
22 | #define LOCKTIME 0x00 | |
23 | #define MPLLCON 0x04 | |
24 | #define UPLLCON 0x08 | |
25 | #define CLKCON 0x0c | |
26 | #define CLKDIVN 0x14 | |
27 | #define CLKSRC 0x1c | |
e317c194 | 28 | #define SWRST 0x30 |
ca2e90ac HS |
29 | |
30 | /* list of PLLs to be registered */ | |
31 | enum s3c2412_plls { | |
32 | mpll, upll, | |
33 | }; | |
34 | ||
35 | static void __iomem *reg_base; | |
36 | ||
37 | #ifdef CONFIG_PM_SLEEP | |
38 | static struct samsung_clk_reg_dump *s3c2412_save; | |
39 | ||
40 | /* | |
41 | * list of controller registers to be saved and restored during a | |
42 | * suspend/resume cycle. | |
43 | */ | |
44 | static unsigned long s3c2412_clk_regs[] __initdata = { | |
45 | LOCKTIME, | |
46 | MPLLCON, | |
47 | UPLLCON, | |
48 | CLKCON, | |
49 | CLKDIVN, | |
50 | CLKSRC, | |
51 | }; | |
52 | ||
53 | static int s3c2412_clk_suspend(void) | |
54 | { | |
55 | samsung_clk_save(reg_base, s3c2412_save, | |
56 | ARRAY_SIZE(s3c2412_clk_regs)); | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
61 | static void s3c2412_clk_resume(void) | |
62 | { | |
63 | samsung_clk_restore(reg_base, s3c2412_save, | |
64 | ARRAY_SIZE(s3c2412_clk_regs)); | |
65 | } | |
66 | ||
67 | static struct syscore_ops s3c2412_clk_syscore_ops = { | |
68 | .suspend = s3c2412_clk_suspend, | |
69 | .resume = s3c2412_clk_resume, | |
70 | }; | |
71 | ||
72 | static void s3c2412_clk_sleep_init(void) | |
73 | { | |
74 | s3c2412_save = samsung_clk_alloc_reg_dump(s3c2412_clk_regs, | |
75 | ARRAY_SIZE(s3c2412_clk_regs)); | |
76 | if (!s3c2412_save) { | |
77 | pr_warn("%s: failed to allocate sleep save data, no sleep support!\n", | |
78 | __func__); | |
79 | return; | |
80 | } | |
81 | ||
82 | register_syscore_ops(&s3c2412_clk_syscore_ops); | |
83 | return; | |
84 | } | |
85 | #else | |
86 | static void s3c2412_clk_sleep_init(void) {} | |
87 | #endif | |
88 | ||
89 | static struct clk_div_table divxti_d[] = { | |
90 | { .val = 0, .div = 1 }, | |
91 | { .val = 1, .div = 2 }, | |
92 | { .val = 2, .div = 4 }, | |
93 | { .val = 3, .div = 6 }, | |
94 | { .val = 4, .div = 8 }, | |
95 | { .val = 5, .div = 10 }, | |
96 | { .val = 6, .div = 12 }, | |
97 | { .val = 7, .div = 14 }, | |
98 | { /* sentinel */ }, | |
99 | }; | |
100 | ||
101 | struct samsung_div_clock s3c2412_dividers[] __initdata = { | |
102 | DIV_T(0, "div_xti", "xti", CLKSRC, 0, 3, divxti_d), | |
103 | DIV(0, "div_cam", "mux_cam", CLKDIVN, 16, 4), | |
104 | DIV(0, "div_i2s", "mux_i2s", CLKDIVN, 12, 4), | |
105 | DIV(0, "div_uart", "mux_uart", CLKDIVN, 8, 4), | |
106 | DIV(0, "div_usb", "mux_usb", CLKDIVN, 6, 1), | |
107 | DIV(0, "div_hclk_half", "hclk", CLKDIVN, 5, 1), | |
108 | DIV(ARMDIV, "armdiv", "msysclk", CLKDIVN, 3, 1), | |
109 | DIV(PCLK, "pclk", "hclk", CLKDIVN, 2, 1), | |
110 | DIV(HCLK, "hclk", "armdiv", CLKDIVN, 0, 2), | |
111 | }; | |
112 | ||
113 | struct samsung_fixed_factor_clock s3c2412_ffactor[] __initdata = { | |
114 | FFACTOR(0, "ff_hclk", "hclk", 2, 1, CLK_SET_RATE_PARENT), | |
115 | }; | |
116 | ||
117 | /* | |
118 | * The first two use the OM[4] setting, which is not readable from | |
119 | * software, so assume it is set to xti. | |
120 | */ | |
121 | PNAME(erefclk_p) = { "xti", "xti", "xti", "ext" }; | |
122 | PNAME(urefclk_p) = { "xti", "xti", "xti", "ext" }; | |
123 | ||
124 | PNAME(camclk_p) = { "usysclk", "hclk" }; | |
125 | PNAME(usbclk_p) = { "usysclk", "hclk" }; | |
126 | PNAME(i2sclk_p) = { "erefclk", "mpll" }; | |
127 | PNAME(uartclk_p) = { "erefclk", "mpll" }; | |
128 | PNAME(usysclk_p) = { "urefclk", "upll" }; | |
129 | PNAME(msysclk_p) = { "mdivclk", "mpll" }; | |
130 | PNAME(mdivclk_p) = { "xti", "div_xti" }; | |
131 | PNAME(armclk_p) = { "armdiv", "hclk" }; | |
132 | ||
133 | struct samsung_mux_clock s3c2412_muxes[] __initdata = { | |
134 | MUX(0, "erefclk", erefclk_p, CLKSRC, 14, 2), | |
135 | MUX(0, "urefclk", urefclk_p, CLKSRC, 12, 2), | |
136 | MUX(0, "mux_cam", camclk_p, CLKSRC, 11, 1), | |
137 | MUX(0, "mux_usb", usbclk_p, CLKSRC, 10, 1), | |
138 | MUX(0, "mux_i2s", i2sclk_p, CLKSRC, 9, 1), | |
139 | MUX(0, "mux_uart", uartclk_p, CLKSRC, 8, 1), | |
140 | MUX(USYSCLK, "usysclk", usysclk_p, CLKSRC, 5, 1), | |
141 | MUX(MSYSCLK, "msysclk", msysclk_p, CLKSRC, 4, 1), | |
142 | MUX(MDIVCLK, "mdivclk", mdivclk_p, CLKSRC, 3, 1), | |
143 | MUX(ARMCLK, "armclk", armclk_p, CLKDIVN, 4, 1), | |
144 | }; | |
145 | ||
146 | static struct samsung_pll_clock s3c2412_plls[] __initdata = { | |
147 | [mpll] = PLL(pll_s3c2440_mpll, MPLL, "mpll", "xti", | |
148 | LOCKTIME, MPLLCON, NULL), | |
149 | [upll] = PLL(pll_s3c2410_upll, UPLL, "upll", "urefclk", | |
150 | LOCKTIME, UPLLCON, NULL), | |
151 | }; | |
152 | ||
153 | struct samsung_gate_clock s3c2412_gates[] __initdata = { | |
154 | GATE(PCLK_WDT, "wdt", "pclk", CLKCON, 28, 0, 0), | |
155 | GATE(PCLK_SPI, "spi", "pclk", CLKCON, 27, 0, 0), | |
156 | GATE(PCLK_I2S, "i2s", "pclk", CLKCON, 26, 0, 0), | |
157 | GATE(PCLK_I2C, "i2c", "pclk", CLKCON, 25, 0, 0), | |
158 | GATE(PCLK_ADC, "adc", "pclk", CLKCON, 24, 0, 0), | |
159 | GATE(PCLK_RTC, "rtc", "pclk", CLKCON, 23, 0, 0), | |
160 | GATE(PCLK_GPIO, "gpio", "pclk", CLKCON, 22, CLK_IGNORE_UNUSED, 0), | |
161 | GATE(PCLK_UART2, "uart2", "pclk", CLKCON, 21, 0, 0), | |
162 | GATE(PCLK_UART1, "uart1", "pclk", CLKCON, 20, 0, 0), | |
163 | GATE(PCLK_UART0, "uart0", "pclk", CLKCON, 19, 0, 0), | |
164 | GATE(PCLK_SDI, "sdi", "pclk", CLKCON, 18, 0, 0), | |
165 | GATE(PCLK_PWM, "pwm", "pclk", CLKCON, 17, 0, 0), | |
166 | GATE(PCLK_USBD, "usb-device", "pclk", CLKCON, 16, 0, 0), | |
167 | GATE(SCLK_CAM, "sclk_cam", "div_cam", CLKCON, 15, 0, 0), | |
168 | GATE(SCLK_UART, "sclk_uart", "div_uart", CLKCON, 14, 0, 0), | |
169 | GATE(SCLK_I2S, "sclk_i2s", "div_i2s", CLKCON, 13, 0, 0), | |
170 | GATE(SCLK_USBH, "sclk_usbh", "div_usb", CLKCON, 12, 0, 0), | |
171 | GATE(SCLK_USBD, "sclk_usbd", "div_usb", CLKCON, 11, 0, 0), | |
172 | GATE(HCLK_HALF, "hclk_half", "div_hclk_half", CLKCON, 10, CLK_IGNORE_UNUSED, 0), | |
173 | GATE(HCLK_X2, "hclkx2", "ff_hclk", CLKCON, 9, CLK_IGNORE_UNUSED, 0), | |
174 | GATE(HCLK_SDRAM, "sdram", "hclk", CLKCON, 8, CLK_IGNORE_UNUSED, 0), | |
175 | GATE(HCLK_USBH, "usb-host", "hclk", CLKCON, 6, 0, 0), | |
176 | GATE(HCLK_LCD, "lcd", "hclk", CLKCON, 5, 0, 0), | |
177 | GATE(HCLK_NAND, "nand", "hclk", CLKCON, 4, 0, 0), | |
178 | GATE(HCLK_DMA3, "dma3", "hclk", CLKCON, 3, CLK_IGNORE_UNUSED, 0), | |
179 | GATE(HCLK_DMA2, "dma2", "hclk", CLKCON, 2, CLK_IGNORE_UNUSED, 0), | |
180 | GATE(HCLK_DMA1, "dma1", "hclk", CLKCON, 1, CLK_IGNORE_UNUSED, 0), | |
181 | GATE(HCLK_DMA0, "dma0", "hclk", CLKCON, 0, CLK_IGNORE_UNUSED, 0), | |
182 | }; | |
183 | ||
184 | struct samsung_clock_alias s3c2412_aliases[] __initdata = { | |
185 | ALIAS(PCLK_UART0, "s3c2412-uart.0", "uart"), | |
186 | ALIAS(PCLK_UART1, "s3c2412-uart.1", "uart"), | |
187 | ALIAS(PCLK_UART2, "s3c2412-uart.2", "uart"), | |
188 | ALIAS(PCLK_UART0, "s3c2412-uart.0", "clk_uart_baud2"), | |
189 | ALIAS(PCLK_UART1, "s3c2412-uart.1", "clk_uart_baud2"), | |
190 | ALIAS(PCLK_UART2, "s3c2412-uart.2", "clk_uart_baud2"), | |
191 | ALIAS(SCLK_UART, NULL, "clk_uart_baud3"), | |
192 | ALIAS(PCLK_I2C, "s3c2410-i2c.0", "i2c"), | |
193 | ALIAS(PCLK_ADC, NULL, "adc"), | |
194 | ALIAS(PCLK_RTC, NULL, "rtc"), | |
195 | ALIAS(PCLK_PWM, NULL, "timers"), | |
196 | ALIAS(HCLK_LCD, NULL, "lcd"), | |
197 | ALIAS(PCLK_USBD, NULL, "usb-device"), | |
198 | ALIAS(SCLK_USBD, NULL, "usb-bus-gadget"), | |
199 | ALIAS(HCLK_USBH, NULL, "usb-host"), | |
200 | ALIAS(SCLK_USBH, NULL, "usb-bus-host"), | |
201 | ALIAS(ARMCLK, NULL, "armclk"), | |
202 | ALIAS(HCLK, NULL, "hclk"), | |
203 | ALIAS(MPLL, NULL, "mpll"), | |
204 | ALIAS(MSYSCLK, NULL, "fclk"), | |
205 | }; | |
206 | ||
e317c194 HS |
207 | static int s3c2412_restart(struct notifier_block *this, |
208 | unsigned long mode, void *cmd) | |
209 | { | |
210 | /* errata "Watch-dog/Software Reset Problem" specifies that | |
211 | * this reset must be done with the SYSCLK sourced from | |
212 | * EXTCLK instead of FOUT to avoid a glitch in the reset | |
213 | * mechanism. | |
214 | * | |
215 | * See the watchdog section of the S3C2412 manual for more | |
216 | * information on this fix. | |
217 | */ | |
218 | ||
219 | __raw_writel(0x00, reg_base + CLKSRC); | |
220 | __raw_writel(0x533C2412, reg_base + SWRST); | |
221 | return NOTIFY_DONE; | |
222 | } | |
223 | ||
224 | static struct notifier_block s3c2412_restart_handler = { | |
225 | .notifier_call = s3c2412_restart, | |
226 | .priority = 129, | |
227 | }; | |
228 | ||
ca2e90ac HS |
229 | /* |
230 | * fixed rate clocks generated outside the soc | |
231 | * Only necessary until the devicetree-move is complete | |
232 | */ | |
233 | #define XTI 1 | |
234 | struct samsung_fixed_rate_clock s3c2412_common_frate_clks[] __initdata = { | |
235 | FRATE(XTI, "xti", NULL, CLK_IS_ROOT, 0), | |
236 | FRATE(0, "ext", NULL, CLK_IS_ROOT, 0), | |
237 | }; | |
238 | ||
976face4 RS |
239 | static void __init s3c2412_common_clk_register_fixed_ext( |
240 | struct samsung_clk_provider *ctx, | |
241 | unsigned long xti_f, unsigned long ext_f) | |
ca2e90ac HS |
242 | { |
243 | /* xtal alias is necessary for the current cpufreq driver */ | |
244 | struct samsung_clock_alias xti_alias = ALIAS(XTI, NULL, "xtal"); | |
245 | ||
246 | s3c2412_common_frate_clks[0].fixed_rate = xti_f; | |
247 | s3c2412_common_frate_clks[1].fixed_rate = ext_f; | |
976face4 | 248 | samsung_clk_register_fixed_rate(ctx, s3c2412_common_frate_clks, |
ca2e90ac HS |
249 | ARRAY_SIZE(s3c2412_common_frate_clks)); |
250 | ||
976face4 | 251 | samsung_clk_register_alias(ctx, &xti_alias, 1); |
ca2e90ac HS |
252 | } |
253 | ||
254 | void __init s3c2412_common_clk_init(struct device_node *np, unsigned long xti_f, | |
255 | unsigned long ext_f, void __iomem *base) | |
256 | { | |
976face4 | 257 | struct samsung_clk_provider *ctx; |
e317c194 | 258 | int ret; |
ca2e90ac HS |
259 | reg_base = base; |
260 | ||
261 | if (np) { | |
262 | reg_base = of_iomap(np, 0); | |
263 | if (!reg_base) | |
264 | panic("%s: failed to map registers\n", __func__); | |
265 | } | |
266 | ||
976face4 RS |
267 | ctx = samsung_clk_init(np, reg_base, NR_CLKS); |
268 | if (!ctx) | |
269 | panic("%s: unable to allocate context.\n", __func__); | |
ca2e90ac HS |
270 | |
271 | /* Register external clocks only in non-dt cases */ | |
272 | if (!np) | |
976face4 | 273 | s3c2412_common_clk_register_fixed_ext(ctx, xti_f, ext_f); |
ca2e90ac HS |
274 | |
275 | /* Register PLLs. */ | |
976face4 | 276 | samsung_clk_register_pll(ctx, s3c2412_plls, ARRAY_SIZE(s3c2412_plls), |
ca2e90ac HS |
277 | reg_base); |
278 | ||
279 | /* Register common internal clocks. */ | |
976face4 RS |
280 | samsung_clk_register_mux(ctx, s3c2412_muxes, ARRAY_SIZE(s3c2412_muxes)); |
281 | samsung_clk_register_div(ctx, s3c2412_dividers, | |
ca2e90ac | 282 | ARRAY_SIZE(s3c2412_dividers)); |
976face4 RS |
283 | samsung_clk_register_gate(ctx, s3c2412_gates, |
284 | ARRAY_SIZE(s3c2412_gates)); | |
285 | samsung_clk_register_fixed_factor(ctx, s3c2412_ffactor, | |
ca2e90ac | 286 | ARRAY_SIZE(s3c2412_ffactor)); |
976face4 | 287 | samsung_clk_register_alias(ctx, s3c2412_aliases, |
ca2e90ac HS |
288 | ARRAY_SIZE(s3c2412_aliases)); |
289 | ||
290 | s3c2412_clk_sleep_init(); | |
d5e136a2 SN |
291 | |
292 | samsung_clk_of_add_provider(np, ctx); | |
e317c194 HS |
293 | |
294 | ret = register_restart_handler(&s3c2412_restart_handler); | |
295 | if (ret) | |
296 | pr_warn("cannot register restart handler, %d\n", ret); | |
ca2e90ac HS |
297 | } |
298 | ||
299 | static void __init s3c2412_clk_init(struct device_node *np) | |
300 | { | |
301 | s3c2412_common_clk_init(np, 0, 0, 0); | |
302 | } | |
303 | CLK_OF_DECLARE(s3c2412_clk, "samsung,s3c2412-clock", s3c2412_clk_init); |