1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 // http://www.samsung.com
5 //
6 // Copyright 2008 Openmoko, Inc.
7 // Copyright 2008 Simtec Electronics
8 // Ben Dooks <ben@simtec.co.uk>
9 // http://armlinux.simtec.co.uk/
10 //
11 // Common Codes for S3C64XX machines
12
13 /*
14 * NOTE: Code in this file is not used when booting with Device Tree support.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/interrupt.h>
21 #include <linux/ioport.h>
22 #include <linux/serial_core.h>
23 #include <linux/serial_s3c.h>
24 #include <linux/platform_device.h>
25 #include <linux/reboot.h>
26 #include <linux/io.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/irq.h>
29 #include <linux/gpio.h>
30 #include <linux/irqchip/arm-vic.h>
31 #include <clocksource/samsung_pwm.h>
32
33 #include <asm/mach/arch.h>
34 #include <asm/mach/map.h>
35 #include <asm/system_misc.h>
36
37 #include <mach/map.h>
38 #include <mach/irqs.h>
39 #include <mach/hardware.h>
40 #include <mach/regs-gpio.h>
41 #include <mach/gpio-samsung.h>
42
43 #include <plat/cpu.h>
44 #include <plat/devs.h>
45 #include <plat/pm.h>
46 #include <plat/gpio-cfg.h>
47 #include <plat/pwm-core.h>
48 #include <plat/regs-irqtype.h>
49
50 #include "common.h"
51 #include "irq-uart.h"
52 #include "watchdog-reset.h"
53
54 /* External clock frequency */
55 static unsigned long xtal_f __ro_after_init = 12000000;
56 static unsigned long xusbxti_f __ro_after_init = 48000000;
57
s3c64xx_set_xtal_freq(unsigned long freq)58 void __init s3c64xx_set_xtal_freq(unsigned long freq)
59 {
60 xtal_f = freq;
61 }
62
s3c64xx_set_xusbxti_freq(unsigned long freq)63 void __init s3c64xx_set_xusbxti_freq(unsigned long freq)
64 {
65 xusbxti_f = freq;
66 }
67
68 /* uart registration process */
69
s3c64xx_init_uarts(struct s3c2410_uartcfg * cfg,int no)70 static void __init s3c64xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
71 {
72 s3c24xx_init_uartdevs("s3c6400-uart", s3c64xx_uart_resources, cfg, no);
73 }
74
75 /* table of supported CPUs */
76
77 static const char name_s3c6400[] = "S3C6400";
78 static const char name_s3c6410[] = "S3C6410";
79
80 static struct cpu_table cpu_ids[] __initdata = {
81 {
82 .idcode = S3C6400_CPU_ID,
83 .idmask = S3C64XX_CPU_MASK,
84 .map_io = s3c6400_map_io,
85 .init_uarts = s3c64xx_init_uarts,
86 .init = s3c6400_init,
87 .name = name_s3c6400,
88 }, {
89 .idcode = S3C6410_CPU_ID,
90 .idmask = S3C64XX_CPU_MASK,
91 .map_io = s3c6410_map_io,
92 .init_uarts = s3c64xx_init_uarts,
93 .init = s3c6410_init,
94 .name = name_s3c6410,
95 },
96 };
97
98 /* minimal IO mapping */
99
100 /* see notes on uart map in arch/arm/mach-s3c64xx/include/mach/debug-macro.S */
101 #define UART_OFFS (S3C_PA_UART & 0xfffff)
102
103 static struct map_desc s3c_iodesc[] __initdata = {
104 {
105 .virtual = (unsigned long)S3C_VA_SYS,
106 .pfn = __phys_to_pfn(S3C64XX_PA_SYSCON),
107 .length = SZ_4K,
108 .type = MT_DEVICE,
109 }, {
110 .virtual = (unsigned long)S3C_VA_MEM,
111 .pfn = __phys_to_pfn(S3C64XX_PA_SROM),
112 .length = SZ_4K,
113 .type = MT_DEVICE,
114 }, {
115 .virtual = (unsigned long)(S3C_VA_UART + UART_OFFS),
116 .pfn = __phys_to_pfn(S3C_PA_UART),
117 .length = SZ_4K,
118 .type = MT_DEVICE,
119 }, {
120 .virtual = (unsigned long)VA_VIC0,
121 .pfn = __phys_to_pfn(S3C64XX_PA_VIC0),
122 .length = SZ_16K,
123 .type = MT_DEVICE,
124 }, {
125 .virtual = (unsigned long)VA_VIC1,
126 .pfn = __phys_to_pfn(S3C64XX_PA_VIC1),
127 .length = SZ_16K,
128 .type = MT_DEVICE,
129 }, {
130 .virtual = (unsigned long)S3C_VA_TIMER,
131 .pfn = __phys_to_pfn(S3C_PA_TIMER),
132 .length = SZ_16K,
133 .type = MT_DEVICE,
134 }, {
135 .virtual = (unsigned long)S3C64XX_VA_GPIO,
136 .pfn = __phys_to_pfn(S3C64XX_PA_GPIO),
137 .length = SZ_4K,
138 .type = MT_DEVICE,
139 }, {
140 .virtual = (unsigned long)S3C64XX_VA_MODEM,
141 .pfn = __phys_to_pfn(S3C64XX_PA_MODEM),
142 .length = SZ_4K,
143 .type = MT_DEVICE,
144 }, {
145 .virtual = (unsigned long)S3C_VA_WATCHDOG,
146 .pfn = __phys_to_pfn(S3C64XX_PA_WATCHDOG),
147 .length = SZ_4K,
148 .type = MT_DEVICE,
149 }, {
150 .virtual = (unsigned long)S3C_VA_USB_HSPHY,
151 .pfn = __phys_to_pfn(S3C64XX_PA_USB_HSPHY),
152 .length = SZ_1K,
153 .type = MT_DEVICE,
154 },
155 };
156
157 static struct bus_type s3c64xx_subsys = {
158 .name = "s3c64xx-core",
159 .dev_name = "s3c64xx-core",
160 };
161
162 static struct device s3c64xx_dev = {
163 .bus = &s3c64xx_subsys,
164 };
165
166 static struct samsung_pwm_variant s3c64xx_pwm_variant = {
167 .bits = 32,
168 .div_base = 0,
169 .has_tint_cstat = true,
170 .tclk_mask = (1 << 7) | (1 << 6) | (1 << 5),
171 };
172
samsung_set_timer_source(unsigned int event,unsigned int source)173 void __init samsung_set_timer_source(unsigned int event, unsigned int source)
174 {
175 s3c64xx_pwm_variant.output_mask = BIT(SAMSUNG_PWM_NUM) - 1;
176 s3c64xx_pwm_variant.output_mask &= ~(BIT(event) | BIT(source));
177 }
178
samsung_timer_init(void)179 void __init samsung_timer_init(void)
180 {
181 unsigned int timer_irqs[SAMSUNG_PWM_NUM] = {
182 IRQ_TIMER0_VIC, IRQ_TIMER1_VIC, IRQ_TIMER2_VIC,
183 IRQ_TIMER3_VIC, IRQ_TIMER4_VIC,
184 };
185
186 samsung_pwm_clocksource_init(S3C_VA_TIMER,
187 timer_irqs, &s3c64xx_pwm_variant);
188 }
189
190 /* read cpu identification code */
191
s3c64xx_init_io(struct map_desc * mach_desc,int size)192 void __init s3c64xx_init_io(struct map_desc *mach_desc, int size)
193 {
194 /* initialise the io descriptors we need for initialisation */
195 iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
196 iotable_init(mach_desc, size);
197
198 /* detect cpu id */
199 s3c64xx_init_cpu();
200
201 s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids));
202
203 samsung_pwm_set_platdata(&s3c64xx_pwm_variant);
204 }
205
s3c64xx_dev_init(void)206 static __init int s3c64xx_dev_init(void)
207 {
208 /* Not applicable when using DT. */
209 if (of_have_populated_dt() || !soc_is_s3c64xx())
210 return 0;
211
212 subsys_system_register(&s3c64xx_subsys, NULL);
213 return device_register(&s3c64xx_dev);
214 }
215 core_initcall(s3c64xx_dev_init);
216
217 /*
218 * setup the sources the vic should advertise resume
219 * for, even though it is not doing the wake
220 * (set_irq_wake needs to be valid)
221 */
222 #define IRQ_VIC0_RESUME (1 << (IRQ_RTC_TIC - IRQ_VIC0_BASE))
223 #define IRQ_VIC1_RESUME (1 << (IRQ_RTC_ALARM - IRQ_VIC1_BASE) | \
224 1 << (IRQ_PENDN - IRQ_VIC1_BASE) | \
225 1 << (IRQ_HSMMC0 - IRQ_VIC1_BASE) | \
226 1 << (IRQ_HSMMC1 - IRQ_VIC1_BASE) | \
227 1 << (IRQ_HSMMC2 - IRQ_VIC1_BASE))
228
s3c64xx_init_irq(u32 vic0_valid,u32 vic1_valid)229 void __init s3c64xx_init_irq(u32 vic0_valid, u32 vic1_valid)
230 {
231 /*
232 * FIXME: there is no better place to put this at the moment
233 * (s3c64xx_clk_init needs ioremap and must happen before init_time
234 * samsung_wdt_reset_init needs clocks)
235 */
236 s3c64xx_clk_init(NULL, xtal_f, xusbxti_f, soc_is_s3c6400(), S3C_VA_SYS);
237 samsung_wdt_reset_init(S3C_VA_WATCHDOG);
238
239 printk(KERN_DEBUG "%s: initialising interrupts\n", __func__);
240
241 /* initialise the pair of VICs */
242 vic_init(VA_VIC0, IRQ_VIC0_BASE, vic0_valid, IRQ_VIC0_RESUME);
243 vic_init(VA_VIC1, IRQ_VIC1_BASE, vic1_valid, IRQ_VIC1_RESUME);
244 }
245
246 #define eint_offset(irq) ((irq) - IRQ_EINT(0))
247 #define eint_irq_to_bit(irq) ((u32)(1 << eint_offset(irq)))
248
s3c_irq_eint_mask(struct irq_data * data)249 static inline void s3c_irq_eint_mask(struct irq_data *data)
250 {
251 u32 mask;
252
253 mask = __raw_readl(S3C64XX_EINT0MASK);
254 mask |= (u32)data->chip_data;
255 __raw_writel(mask, S3C64XX_EINT0MASK);
256 }
257
s3c_irq_eint_unmask(struct irq_data * data)258 static void s3c_irq_eint_unmask(struct irq_data *data)
259 {
260 u32 mask;
261
262 mask = __raw_readl(S3C64XX_EINT0MASK);
263 mask &= ~((u32)data->chip_data);
264 __raw_writel(mask, S3C64XX_EINT0MASK);
265 }
266
s3c_irq_eint_ack(struct irq_data * data)267 static inline void s3c_irq_eint_ack(struct irq_data *data)
268 {
269 __raw_writel((u32)data->chip_data, S3C64XX_EINT0PEND);
270 }
271
s3c_irq_eint_maskack(struct irq_data * data)272 static void s3c_irq_eint_maskack(struct irq_data *data)
273 {
274 /* compiler should in-line these */
275 s3c_irq_eint_mask(data);
276 s3c_irq_eint_ack(data);
277 }
278
s3c_irq_eint_set_type(struct irq_data * data,unsigned int type)279 static int s3c_irq_eint_set_type(struct irq_data *data, unsigned int type)
280 {
281 int offs = eint_offset(data->irq);
282 int pin, pin_val;
283 int shift;
284 u32 ctrl, mask;
285 u32 newvalue = 0;
286 void __iomem *reg;
287
288 if (offs > 27)
289 return -EINVAL;
290
291 if (offs <= 15)
292 reg = S3C64XX_EINT0CON0;
293 else
294 reg = S3C64XX_EINT0CON1;
295
296 switch (type) {
297 case IRQ_TYPE_NONE:
298 printk(KERN_WARNING "No edge setting!\n");
299 break;
300
301 case IRQ_TYPE_EDGE_RISING:
302 newvalue = S3C2410_EXTINT_RISEEDGE;
303 break;
304
305 case IRQ_TYPE_EDGE_FALLING:
306 newvalue = S3C2410_EXTINT_FALLEDGE;
307 break;
308
309 case IRQ_TYPE_EDGE_BOTH:
310 newvalue = S3C2410_EXTINT_BOTHEDGE;
311 break;
312
313 case IRQ_TYPE_LEVEL_LOW:
314 newvalue = S3C2410_EXTINT_LOWLEV;
315 break;
316
317 case IRQ_TYPE_LEVEL_HIGH:
318 newvalue = S3C2410_EXTINT_HILEV;
319 break;
320
321 default:
322 printk(KERN_ERR "No such irq type %d", type);
323 return -1;
324 }
325
326 if (offs <= 15)
327 shift = (offs / 2) * 4;
328 else
329 shift = ((offs - 16) / 2) * 4;
330 mask = 0x7 << shift;
331
332 ctrl = __raw_readl(reg);
333 ctrl &= ~mask;
334 ctrl |= newvalue << shift;
335 __raw_writel(ctrl, reg);
336
337 /* set the GPIO pin appropriately */
338
339 if (offs < 16) {
340 pin = S3C64XX_GPN(offs);
341 pin_val = S3C_GPIO_SFN(2);
342 } else if (offs < 23) {
343 pin = S3C64XX_GPL(offs + 8 - 16);
344 pin_val = S3C_GPIO_SFN(3);
345 } else {
346 pin = S3C64XX_GPM(offs - 23);
347 pin_val = S3C_GPIO_SFN(3);
348 }
349
350 s3c_gpio_cfgpin(pin, pin_val);
351
352 return 0;
353 }
354
355 static struct irq_chip s3c_irq_eint = {
356 .name = "s3c-eint",
357 .irq_mask = s3c_irq_eint_mask,
358 .irq_unmask = s3c_irq_eint_unmask,
359 .irq_mask_ack = s3c_irq_eint_maskack,
360 .irq_ack = s3c_irq_eint_ack,
361 .irq_set_type = s3c_irq_eint_set_type,
362 .irq_set_wake = s3c_irqext_wake,
363 };
364
365 /* s3c_irq_demux_eint
366 *
367 * This function demuxes the IRQ from the group0 external interrupts,
368 * from IRQ_EINT(0) to IRQ_EINT(27). It is designed to be inlined into
369 * the specific handlers s3c_irq_demux_eintX_Y.
370 */
s3c_irq_demux_eint(unsigned int start,unsigned int end)371 static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end)
372 {
373 u32 status = __raw_readl(S3C64XX_EINT0PEND);
374 u32 mask = __raw_readl(S3C64XX_EINT0MASK);
375 unsigned int irq;
376
377 status &= ~mask;
378 status >>= start;
379 status &= (1 << (end - start + 1)) - 1;
380
381 for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) {
382 if (status & 1)
383 generic_handle_irq(irq);
384
385 status >>= 1;
386 }
387 }
388
s3c_irq_demux_eint0_3(struct irq_desc * desc)389 static void s3c_irq_demux_eint0_3(struct irq_desc *desc)
390 {
391 s3c_irq_demux_eint(0, 3);
392 }
393
s3c_irq_demux_eint4_11(struct irq_desc * desc)394 static void s3c_irq_demux_eint4_11(struct irq_desc *desc)
395 {
396 s3c_irq_demux_eint(4, 11);
397 }
398
s3c_irq_demux_eint12_19(struct irq_desc * desc)399 static void s3c_irq_demux_eint12_19(struct irq_desc *desc)
400 {
401 s3c_irq_demux_eint(12, 19);
402 }
403
s3c_irq_demux_eint20_27(struct irq_desc * desc)404 static void s3c_irq_demux_eint20_27(struct irq_desc *desc)
405 {
406 s3c_irq_demux_eint(20, 27);
407 }
408
s3c64xx_init_irq_eint(void)409 static int __init s3c64xx_init_irq_eint(void)
410 {
411 int irq;
412
413 /* On DT-enabled systems EINTs are handled by pinctrl-s3c64xx driver. */
414 if (of_have_populated_dt() || !soc_is_s3c64xx())
415 return -ENODEV;
416
417 for (irq = IRQ_EINT(0); irq <= IRQ_EINT(27); irq++) {
418 irq_set_chip_and_handler(irq, &s3c_irq_eint, handle_level_irq);
419 irq_set_chip_data(irq, (void *)eint_irq_to_bit(irq));
420 irq_clear_status_flags(irq, IRQ_NOREQUEST);
421 }
422
423 irq_set_chained_handler(IRQ_EINT0_3, s3c_irq_demux_eint0_3);
424 irq_set_chained_handler(IRQ_EINT4_11, s3c_irq_demux_eint4_11);
425 irq_set_chained_handler(IRQ_EINT12_19, s3c_irq_demux_eint12_19);
426 irq_set_chained_handler(IRQ_EINT20_27, s3c_irq_demux_eint20_27);
427
428 return 0;
429 }
430 arch_initcall(s3c64xx_init_irq_eint);
431
s3c64xx_restart(enum reboot_mode mode,const char * cmd)432 void s3c64xx_restart(enum reboot_mode mode, const char *cmd)
433 {
434 if (mode != REBOOT_SOFT)
435 samsung_wdt_reset();
436
437 /* if all else fails, or mode was for soft, jump to 0 */
438 soft_restart(0);
439 }
440