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11#include <linux/clk.h>
12#include <linux/clkdev.h>
13#include <linux/clk-provider.h>
14#include <linux/of.h>
15#include <linux/of_address.h>
16#include <linux/syscore_ops.h>
17#include <linux/reboot.h>
18
19#include <dt-bindings/clock/s3c2412.h>
20
21#include "clk.h"
22#include "clk-pll.h"
23
24#define LOCKTIME 0x00
25#define MPLLCON 0x04
26#define UPLLCON 0x08
27#define CLKCON 0x0c
28#define CLKDIVN 0x14
29#define CLKSRC 0x1c
30#define SWRST 0x30
31
32
33enum s3c2412_plls {
34 mpll, upll,
35};
36
37static void __iomem *reg_base;
38
39#ifdef CONFIG_PM_SLEEP
40static struct samsung_clk_reg_dump *s3c2412_save;
41
42
43
44
45
46static unsigned long s3c2412_clk_regs[] __initdata = {
47 LOCKTIME,
48 MPLLCON,
49 UPLLCON,
50 CLKCON,
51 CLKDIVN,
52 CLKSRC,
53};
54
55static int s3c2412_clk_suspend(void)
56{
57 samsung_clk_save(reg_base, s3c2412_save,
58 ARRAY_SIZE(s3c2412_clk_regs));
59
60 return 0;
61}
62
63static void s3c2412_clk_resume(void)
64{
65 samsung_clk_restore(reg_base, s3c2412_save,
66 ARRAY_SIZE(s3c2412_clk_regs));
67}
68
69static struct syscore_ops s3c2412_clk_syscore_ops = {
70 .suspend = s3c2412_clk_suspend,
71 .resume = s3c2412_clk_resume,
72};
73
74static void s3c2412_clk_sleep_init(void)
75{
76 s3c2412_save = samsung_clk_alloc_reg_dump(s3c2412_clk_regs,
77 ARRAY_SIZE(s3c2412_clk_regs));
78 if (!s3c2412_save) {
79 pr_warn("%s: failed to allocate sleep save data, no sleep support!\n",
80 __func__);
81 return;
82 }
83
84 register_syscore_ops(&s3c2412_clk_syscore_ops);
85 return;
86}
87#else
88static void s3c2412_clk_sleep_init(void) {}
89#endif
90
91static struct clk_div_table divxti_d[] = {
92 { .val = 0, .div = 1 },
93 { .val = 1, .div = 2 },
94 { .val = 2, .div = 4 },
95 { .val = 3, .div = 6 },
96 { .val = 4, .div = 8 },
97 { .val = 5, .div = 10 },
98 { .val = 6, .div = 12 },
99 { .val = 7, .div = 14 },
100 { },
101};
102
103struct samsung_div_clock s3c2412_dividers[] __initdata = {
104 DIV_T(0, "div_xti", "xti", CLKSRC, 0, 3, divxti_d),
105 DIV(0, "div_cam", "mux_cam", CLKDIVN, 16, 4),
106 DIV(0, "div_i2s", "mux_i2s", CLKDIVN, 12, 4),
107 DIV(0, "div_uart", "mux_uart", CLKDIVN, 8, 4),
108 DIV(0, "div_usb", "mux_usb", CLKDIVN, 6, 1),
109 DIV(0, "div_hclk_half", "hclk", CLKDIVN, 5, 1),
110 DIV(ARMDIV, "armdiv", "msysclk", CLKDIVN, 3, 1),
111 DIV(PCLK, "pclk", "hclk", CLKDIVN, 2, 1),
112 DIV(HCLK, "hclk", "armdiv", CLKDIVN, 0, 2),
113};
114
115struct samsung_fixed_factor_clock s3c2412_ffactor[] __initdata = {
116 FFACTOR(0, "ff_hclk", "hclk", 2, 1, CLK_SET_RATE_PARENT),
117};
118
119
120
121
122
123PNAME(erefclk_p) = { "xti", "xti", "xti", "ext" };
124PNAME(urefclk_p) = { "xti", "xti", "xti", "ext" };
125
126PNAME(camclk_p) = { "usysclk", "hclk" };
127PNAME(usbclk_p) = { "usysclk", "hclk" };
128PNAME(i2sclk_p) = { "erefclk", "mpll" };
129PNAME(uartclk_p) = { "erefclk", "mpll" };
130PNAME(usysclk_p) = { "urefclk", "upll" };
131PNAME(msysclk_p) = { "mdivclk", "mpll" };
132PNAME(mdivclk_p) = { "xti", "div_xti" };
133PNAME(armclk_p) = { "armdiv", "hclk" };
134
135struct samsung_mux_clock s3c2412_muxes[] __initdata = {
136 MUX(0, "erefclk", erefclk_p, CLKSRC, 14, 2),
137 MUX(0, "urefclk", urefclk_p, CLKSRC, 12, 2),
138 MUX(0, "mux_cam", camclk_p, CLKSRC, 11, 1),
139 MUX(0, "mux_usb", usbclk_p, CLKSRC, 10, 1),
140 MUX(0, "mux_i2s", i2sclk_p, CLKSRC, 9, 1),
141 MUX(0, "mux_uart", uartclk_p, CLKSRC, 8, 1),
142 MUX(USYSCLK, "usysclk", usysclk_p, CLKSRC, 5, 1),
143 MUX(MSYSCLK, "msysclk", msysclk_p, CLKSRC, 4, 1),
144 MUX(MDIVCLK, "mdivclk", mdivclk_p, CLKSRC, 3, 1),
145 MUX(ARMCLK, "armclk", armclk_p, CLKDIVN, 4, 1),
146};
147
148static struct samsung_pll_clock s3c2412_plls[] __initdata = {
149 [mpll] = PLL(pll_s3c2440_mpll, MPLL, "mpll", "xti",
150 LOCKTIME, MPLLCON, NULL),
151 [upll] = PLL(pll_s3c2410_upll, UPLL, "upll", "urefclk",
152 LOCKTIME, UPLLCON, NULL),
153};
154
155struct samsung_gate_clock s3c2412_gates[] __initdata = {
156 GATE(PCLK_WDT, "wdt", "pclk", CLKCON, 28, 0, 0),
157 GATE(PCLK_SPI, "spi", "pclk", CLKCON, 27, 0, 0),
158 GATE(PCLK_I2S, "i2s", "pclk", CLKCON, 26, 0, 0),
159 GATE(PCLK_I2C, "i2c", "pclk", CLKCON, 25, 0, 0),
160 GATE(PCLK_ADC, "adc", "pclk", CLKCON, 24, 0, 0),
161 GATE(PCLK_RTC, "rtc", "pclk", CLKCON, 23, 0, 0),
162 GATE(PCLK_GPIO, "gpio", "pclk", CLKCON, 22, CLK_IGNORE_UNUSED, 0),
163 GATE(PCLK_UART2, "uart2", "pclk", CLKCON, 21, 0, 0),
164 GATE(PCLK_UART1, "uart1", "pclk", CLKCON, 20, 0, 0),
165 GATE(PCLK_UART0, "uart0", "pclk", CLKCON, 19, 0, 0),
166 GATE(PCLK_SDI, "sdi", "pclk", CLKCON, 18, 0, 0),
167 GATE(PCLK_PWM, "pwm", "pclk", CLKCON, 17, 0, 0),
168 GATE(PCLK_USBD, "usb-device", "pclk", CLKCON, 16, 0, 0),
169 GATE(SCLK_CAM, "sclk_cam", "div_cam", CLKCON, 15, 0, 0),
170 GATE(SCLK_UART, "sclk_uart", "div_uart", CLKCON, 14, 0, 0),
171 GATE(SCLK_I2S, "sclk_i2s", "div_i2s", CLKCON, 13, 0, 0),
172 GATE(SCLK_USBH, "sclk_usbh", "div_usb", CLKCON, 12, 0, 0),
173 GATE(SCLK_USBD, "sclk_usbd", "div_usb", CLKCON, 11, 0, 0),
174 GATE(HCLK_HALF, "hclk_half", "div_hclk_half", CLKCON, 10, CLK_IGNORE_UNUSED, 0),
175 GATE(HCLK_X2, "hclkx2", "ff_hclk", CLKCON, 9, CLK_IGNORE_UNUSED, 0),
176 GATE(HCLK_SDRAM, "sdram", "hclk", CLKCON, 8, CLK_IGNORE_UNUSED, 0),
177 GATE(HCLK_USBH, "usb-host", "hclk", CLKCON, 6, 0, 0),
178 GATE(HCLK_LCD, "lcd", "hclk", CLKCON, 5, 0, 0),
179 GATE(HCLK_NAND, "nand", "hclk", CLKCON, 4, 0, 0),
180 GATE(HCLK_DMA3, "dma3", "hclk", CLKCON, 3, CLK_IGNORE_UNUSED, 0),
181 GATE(HCLK_DMA2, "dma2", "hclk", CLKCON, 2, CLK_IGNORE_UNUSED, 0),
182 GATE(HCLK_DMA1, "dma1", "hclk", CLKCON, 1, CLK_IGNORE_UNUSED, 0),
183 GATE(HCLK_DMA0, "dma0", "hclk", CLKCON, 0, CLK_IGNORE_UNUSED, 0),
184};
185
186struct samsung_clock_alias s3c2412_aliases[] __initdata = {
187 ALIAS(PCLK_UART0, "s3c2412-uart.0", "uart"),
188 ALIAS(PCLK_UART1, "s3c2412-uart.1", "uart"),
189 ALIAS(PCLK_UART2, "s3c2412-uart.2", "uart"),
190 ALIAS(PCLK_UART0, "s3c2412-uart.0", "clk_uart_baud2"),
191 ALIAS(PCLK_UART1, "s3c2412-uart.1", "clk_uart_baud2"),
192 ALIAS(PCLK_UART2, "s3c2412-uart.2", "clk_uart_baud2"),
193 ALIAS(SCLK_UART, NULL, "clk_uart_baud3"),
194 ALIAS(PCLK_I2C, "s3c2410-i2c.0", "i2c"),
195 ALIAS(PCLK_ADC, NULL, "adc"),
196 ALIAS(PCLK_RTC, NULL, "rtc"),
197 ALIAS(PCLK_PWM, NULL, "timers"),
198 ALIAS(HCLK_LCD, NULL, "lcd"),
199 ALIAS(PCLK_USBD, NULL, "usb-device"),
200 ALIAS(SCLK_USBD, NULL, "usb-bus-gadget"),
201 ALIAS(HCLK_USBH, NULL, "usb-host"),
202 ALIAS(SCLK_USBH, NULL, "usb-bus-host"),
203 ALIAS(ARMCLK, NULL, "armclk"),
204 ALIAS(HCLK, NULL, "hclk"),
205 ALIAS(MPLL, NULL, "mpll"),
206 ALIAS(MSYSCLK, NULL, "fclk"),
207};
208
209static int s3c2412_restart(struct notifier_block *this,
210 unsigned long mode, void *cmd)
211{
212
213
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216
217
218
219
220
221 __raw_writel(0x00, reg_base + CLKSRC);
222 __raw_writel(0x533C2412, reg_base + SWRST);
223 return NOTIFY_DONE;
224}
225
226static struct notifier_block s3c2412_restart_handler = {
227 .notifier_call = s3c2412_restart,
228 .priority = 129,
229};
230
231
232
233
234
235#define XTI 1
236struct samsung_fixed_rate_clock s3c2412_common_frate_clks[] __initdata = {
237 FRATE(XTI, "xti", NULL, CLK_IS_ROOT, 0),
238 FRATE(0, "ext", NULL, CLK_IS_ROOT, 0),
239};
240
241static void __init s3c2412_common_clk_register_fixed_ext(
242 struct samsung_clk_provider *ctx,
243 unsigned long xti_f, unsigned long ext_f)
244{
245
246 struct samsung_clock_alias xti_alias = ALIAS(XTI, NULL, "xtal");
247
248 s3c2412_common_frate_clks[0].fixed_rate = xti_f;
249 s3c2412_common_frate_clks[1].fixed_rate = ext_f;
250 samsung_clk_register_fixed_rate(ctx, s3c2412_common_frate_clks,
251 ARRAY_SIZE(s3c2412_common_frate_clks));
252
253 samsung_clk_register_alias(ctx, &xti_alias, 1);
254}
255
256void __init s3c2412_common_clk_init(struct device_node *np, unsigned long xti_f,
257 unsigned long ext_f, void __iomem *base)
258{
259 struct samsung_clk_provider *ctx;
260 int ret;
261 reg_base = base;
262
263 if (np) {
264 reg_base = of_iomap(np, 0);
265 if (!reg_base)
266 panic("%s: failed to map registers\n", __func__);
267 }
268
269 ctx = samsung_clk_init(np, reg_base, NR_CLKS);
270 if (!ctx)
271 panic("%s: unable to allocate context.\n", __func__);
272
273
274 if (!np)
275 s3c2412_common_clk_register_fixed_ext(ctx, xti_f, ext_f);
276
277
278 samsung_clk_register_pll(ctx, s3c2412_plls, ARRAY_SIZE(s3c2412_plls),
279 reg_base);
280
281
282 samsung_clk_register_mux(ctx, s3c2412_muxes, ARRAY_SIZE(s3c2412_muxes));
283 samsung_clk_register_div(ctx, s3c2412_dividers,
284 ARRAY_SIZE(s3c2412_dividers));
285 samsung_clk_register_gate(ctx, s3c2412_gates,
286 ARRAY_SIZE(s3c2412_gates));
287 samsung_clk_register_fixed_factor(ctx, s3c2412_ffactor,
288 ARRAY_SIZE(s3c2412_ffactor));
289 samsung_clk_register_alias(ctx, s3c2412_aliases,
290 ARRAY_SIZE(s3c2412_aliases));
291
292 s3c2412_clk_sleep_init();
293
294 samsung_clk_of_add_provider(np, ctx);
295
296 ret = register_restart_handler(&s3c2412_restart_handler);
297 if (ret)
298 pr_warn("cannot register restart handler, %d\n", ret);
299}
300
301static void __init s3c2412_clk_init(struct device_node *np)
302{
303 s3c2412_common_clk_init(np, 0, 0, 0);
304}
305CLK_OF_DECLARE(s3c2412_clk, "samsung,s3c2412-clock", s3c2412_clk_init);
306
