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278a6752 LC |
1 | /* |
2 | * derived from linux/arch/arm/mach-versatile/core.c | |
3 | * linux/arch/arm/mach-bcmring/core.c | |
4 | * | |
5 | * Copyright (C) 1999 - 2003 ARM Limited | |
6 | * Copyright (C) 2000 Deep Blue Solutions Ltd | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | /* Portions copyright Broadcom 2008 */ | |
23 | ||
24 | #include <linux/init.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/dma-mapping.h> | |
27 | #include <linux/platform_device.h> | |
28 | #include <linux/sysdev.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/amba/bus.h> | |
31 | #include <linux/clocksource.h> | |
32 | #include <linux/clockchips.h> | |
33 | ||
34 | #include <linux/amba/bus.h> | |
35 | #include <mach/csp/mm_addr.h> | |
36 | #include <mach/hardware.h> | |
37 | #include <asm/clkdev.h> | |
38 | #include <linux/io.h> | |
39 | #include <asm/irq.h> | |
40 | #include <asm/hardware/arm_timer.h> | |
41 | #include <asm/mach-types.h> | |
42 | ||
43 | #include <asm/mach/arch.h> | |
44 | #include <asm/mach/flash.h> | |
45 | #include <asm/mach/irq.h> | |
46 | #include <asm/mach/time.h> | |
47 | #include <asm/mach/map.h> | |
48 | #include <asm/mach/mmc.h> | |
49 | ||
50 | #include <cfg_global.h> | |
51 | ||
52 | #include "clock.h" | |
53 | ||
54 | #include <csp/secHw.h> | |
55 | #include <mach/csp/secHw_def.h> | |
56 | #include <mach/csp/chipcHw_inline.h> | |
57 | #include <mach/csp/tmrHw_reg.h> | |
58 | ||
59 | #define AMBA_DEVICE(name, initname, base, plat, size) \ | |
60 | static struct amba_device name##_device = { \ | |
61 | .dev = { \ | |
62 | .coherent_dma_mask = ~0, \ | |
63 | .init_name = initname, \ | |
64 | .platform_data = plat \ | |
65 | }, \ | |
66 | .res = { \ | |
67 | .start = MM_ADDR_IO_##base, \ | |
68 | .end = MM_ADDR_IO_##base + (size) - 1, \ | |
69 | .flags = IORESOURCE_MEM \ | |
70 | }, \ | |
71 | .dma_mask = ~0, \ | |
72 | .irq = { \ | |
73 | IRQ_##base \ | |
74 | } \ | |
75 | } | |
76 | ||
77 | ||
78 | AMBA_DEVICE(uartA, "uarta", UARTA, NULL, SZ_4K); | |
79 | AMBA_DEVICE(uartB, "uartb", UARTB, NULL, SZ_4K); | |
80 | ||
81 | static struct clk pll1_clk = { | |
82 | .name = "PLL1", | |
83 | .type = CLK_TYPE_PRIMARY | CLK_TYPE_PLL1, | |
84 | .rate_hz = 2000000000, | |
85 | .use_cnt = 7, | |
86 | }; | |
87 | ||
88 | static struct clk uart_clk = { | |
89 | .name = "UART", | |
90 | .type = CLK_TYPE_PROGRAMMABLE, | |
91 | .csp_id = chipcHw_CLOCK_UART, | |
92 | .rate_hz = HW_CFG_UART_CLK_HZ, | |
93 | .parent = &pll1_clk, | |
94 | }; | |
95 | ||
96 | static struct clk_lookup lookups[] = { | |
97 | { /* UART0 */ | |
98 | .dev_id = "uarta", | |
99 | .clk = &uart_clk, | |
100 | }, { /* UART1 */ | |
101 | .dev_id = "uartb", | |
102 | .clk = &uart_clk, | |
103 | } | |
104 | }; | |
105 | ||
106 | static struct amba_device *amba_devs[] __initdata = { | |
107 | &uartA_device, | |
108 | &uartB_device, | |
109 | }; | |
110 | ||
111 | void __init bcmring_amba_init(void) | |
112 | { | |
113 | int i; | |
114 | u32 bus_clock; | |
115 | ||
116 | /* Linux is run initially in non-secure mode. Secure peripherals */ | |
117 | /* generate FIQ, and must be handled in secure mode. Until we have */ | |
118 | /* a linux security monitor implementation, keep everything in */ | |
119 | /* non-secure mode. */ | |
120 | chipcHw_busInterfaceClockEnable(chipcHw_REG_BUS_CLOCK_SPU); | |
121 | secHw_setUnsecure(secHw_BLK_MASK_CHIP_CONTROL | | |
122 | secHw_BLK_MASK_KEY_SCAN | | |
123 | secHw_BLK_MASK_TOUCH_SCREEN | | |
124 | secHw_BLK_MASK_UART0 | | |
125 | secHw_BLK_MASK_UART1 | | |
126 | secHw_BLK_MASK_WATCHDOG | | |
127 | secHw_BLK_MASK_SPUM | | |
128 | secHw_BLK_MASK_DDR2 | | |
129 | secHw_BLK_MASK_SPU | | |
130 | secHw_BLK_MASK_PKA | | |
131 | secHw_BLK_MASK_RNG | | |
132 | secHw_BLK_MASK_RTC | | |
133 | secHw_BLK_MASK_OTP | | |
134 | secHw_BLK_MASK_BOOT | | |
135 | secHw_BLK_MASK_MPU | | |
136 | secHw_BLK_MASK_TZCTRL | secHw_BLK_MASK_INTR); | |
137 | ||
138 | /* Only the devices attached to the AMBA bus are enabled just before the bus is */ | |
139 | /* scanned and the drivers are loaded. The clocks need to be on for the AMBA bus */ | |
140 | /* driver to access these blocks. The bus is probed, and the drivers are loaded. */ | |
141 | /* FIXME Need to remove enable of PIF once CLCD clock enable used properly in FPGA. */ | |
142 | bus_clock = chipcHw_REG_BUS_CLOCK_GE | |
143 | | chipcHw_REG_BUS_CLOCK_SDIO0 | chipcHw_REG_BUS_CLOCK_SDIO1; | |
144 | ||
145 | chipcHw_busInterfaceClockEnable(bus_clock); | |
146 | ||
147 | for (i = 0; i < ARRAY_SIZE(lookups); i++) | |
148 | clkdev_add(&lookups[i]); | |
149 | ||
150 | for (i = 0; i < ARRAY_SIZE(amba_devs); i++) { | |
151 | struct amba_device *d = amba_devs[i]; | |
152 | amba_device_register(d, &iomem_resource); | |
153 | } | |
154 | } | |
155 | ||
156 | /* | |
157 | * Where is the timer (VA)? | |
158 | */ | |
159 | #define TIMER0_VA_BASE MM_IO_BASE_TMR | |
160 | #define TIMER1_VA_BASE (MM_IO_BASE_TMR + 0x20) | |
161 | #define TIMER2_VA_BASE (MM_IO_BASE_TMR + 0x40) | |
162 | #define TIMER3_VA_BASE (MM_IO_BASE_TMR + 0x60) | |
163 | ||
164 | /* Timer 0 - 25 MHz, Timer3 at bus clock rate, typically 150-166 MHz */ | |
165 | #if defined(CONFIG_ARCH_FPGA11107) | |
166 | /* fpga cpu/bus are currently 30 times slower so scale frequency as well to */ | |
167 | /* slow down Linux's sense of time */ | |
168 | #define TIMER0_FREQUENCY_MHZ (tmrHw_LOW_FREQUENCY_MHZ * 30) | |
169 | #define TIMER1_FREQUENCY_MHZ (tmrHw_LOW_FREQUENCY_MHZ * 30) | |
170 | #define TIMER3_FREQUENCY_MHZ (tmrHw_HIGH_FREQUENCY_MHZ * 30) | |
171 | #define TIMER3_FREQUENCY_KHZ (tmrHw_HIGH_FREQUENCY_HZ / 1000 * 30) | |
172 | #else | |
173 | #define TIMER0_FREQUENCY_MHZ tmrHw_LOW_FREQUENCY_MHZ | |
174 | #define TIMER1_FREQUENCY_MHZ tmrHw_LOW_FREQUENCY_MHZ | |
175 | #define TIMER3_FREQUENCY_MHZ tmrHw_HIGH_FREQUENCY_MHZ | |
176 | #define TIMER3_FREQUENCY_KHZ (tmrHw_HIGH_FREQUENCY_HZ / 1000) | |
177 | #endif | |
178 | ||
179 | #define TICKS_PER_uSEC TIMER0_FREQUENCY_MHZ | |
180 | ||
181 | /* | |
182 | * These are useconds NOT ticks. | |
183 | * | |
184 | */ | |
185 | #define mSEC_1 1000 | |
186 | #define mSEC_5 (mSEC_1 * 5) | |
187 | #define mSEC_10 (mSEC_1 * 10) | |
188 | #define mSEC_25 (mSEC_1 * 25) | |
189 | #define SEC_1 (mSEC_1 * 1000) | |
190 | ||
191 | /* | |
192 | * How long is the timer interval? | |
193 | */ | |
194 | #define TIMER_INTERVAL (TICKS_PER_uSEC * mSEC_10) | |
195 | #if TIMER_INTERVAL >= 0x100000 | |
196 | #define TIMER_RELOAD (TIMER_INTERVAL >> 8) | |
197 | #define TIMER_DIVISOR (TIMER_CTRL_DIV256) | |
198 | #define TICKS2USECS(x) (256 * (x) / TICKS_PER_uSEC) | |
199 | #elif TIMER_INTERVAL >= 0x10000 | |
200 | #define TIMER_RELOAD (TIMER_INTERVAL >> 4) /* Divide by 16 */ | |
201 | #define TIMER_DIVISOR (TIMER_CTRL_DIV16) | |
202 | #define TICKS2USECS(x) (16 * (x) / TICKS_PER_uSEC) | |
203 | #else | |
204 | #define TIMER_RELOAD (TIMER_INTERVAL) | |
205 | #define TIMER_DIVISOR (TIMER_CTRL_DIV1) | |
206 | #define TICKS2USECS(x) ((x) / TICKS_PER_uSEC) | |
207 | #endif | |
208 | ||
209 | static void timer_set_mode(enum clock_event_mode mode, | |
210 | struct clock_event_device *clk) | |
211 | { | |
212 | unsigned long ctrl; | |
213 | ||
214 | switch (mode) { | |
215 | case CLOCK_EVT_MODE_PERIODIC: | |
216 | writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD); | |
217 | ||
218 | ctrl = TIMER_CTRL_PERIODIC; | |
219 | ctrl |= | |
220 | TIMER_DIVISOR | TIMER_CTRL_32BIT | TIMER_CTRL_IE | | |
221 | TIMER_CTRL_ENABLE; | |
222 | break; | |
223 | case CLOCK_EVT_MODE_ONESHOT: | |
224 | /* period set, and timer enabled in 'next_event' hook */ | |
225 | ctrl = TIMER_CTRL_ONESHOT; | |
226 | ctrl |= TIMER_DIVISOR | TIMER_CTRL_32BIT | TIMER_CTRL_IE; | |
227 | break; | |
228 | case CLOCK_EVT_MODE_UNUSED: | |
229 | case CLOCK_EVT_MODE_SHUTDOWN: | |
230 | default: | |
231 | ctrl = 0; | |
232 | } | |
233 | ||
234 | writel(ctrl, TIMER0_VA_BASE + TIMER_CTRL); | |
235 | } | |
236 | ||
237 | static int timer_set_next_event(unsigned long evt, | |
238 | struct clock_event_device *unused) | |
239 | { | |
240 | unsigned long ctrl = readl(TIMER0_VA_BASE + TIMER_CTRL); | |
241 | ||
242 | writel(evt, TIMER0_VA_BASE + TIMER_LOAD); | |
243 | writel(ctrl | TIMER_CTRL_ENABLE, TIMER0_VA_BASE + TIMER_CTRL); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | static struct clock_event_device timer0_clockevent = { | |
249 | .name = "timer0", | |
250 | .shift = 32, | |
251 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, | |
252 | .set_mode = timer_set_mode, | |
253 | .set_next_event = timer_set_next_event, | |
254 | }; | |
255 | ||
256 | /* | |
257 | * IRQ handler for the timer | |
258 | */ | |
259 | static irqreturn_t bcmring_timer_interrupt(int irq, void *dev_id) | |
260 | { | |
261 | struct clock_event_device *evt = &timer0_clockevent; | |
262 | ||
263 | writel(1, TIMER0_VA_BASE + TIMER_INTCLR); | |
264 | ||
265 | evt->event_handler(evt); | |
266 | ||
267 | return IRQ_HANDLED; | |
268 | } | |
269 | ||
270 | static struct irqaction bcmring_timer_irq = { | |
271 | .name = "bcmring Timer Tick", | |
272 | .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, | |
273 | .handler = bcmring_timer_interrupt, | |
274 | }; | |
275 | ||
276 | static cycle_t bcmring_get_cycles_timer1(void) | |
277 | { | |
278 | return ~readl(TIMER1_VA_BASE + TIMER_VALUE); | |
279 | } | |
280 | ||
281 | static cycle_t bcmring_get_cycles_timer3(void) | |
282 | { | |
283 | return ~readl(TIMER3_VA_BASE + TIMER_VALUE); | |
284 | } | |
285 | ||
286 | static struct clocksource clocksource_bcmring_timer1 = { | |
287 | .name = "timer1", | |
288 | .rating = 200, | |
289 | .read = bcmring_get_cycles_timer1, | |
290 | .mask = CLOCKSOURCE_MASK(32), | |
291 | .shift = 20, | |
292 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, | |
293 | }; | |
294 | ||
295 | static struct clocksource clocksource_bcmring_timer3 = { | |
296 | .name = "timer3", | |
297 | .rating = 100, | |
298 | .read = bcmring_get_cycles_timer3, | |
299 | .mask = CLOCKSOURCE_MASK(32), | |
300 | .shift = 20, | |
301 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, | |
302 | }; | |
303 | ||
304 | static int __init bcmring_clocksource_init(void) | |
305 | { | |
306 | /* setup timer1 as free-running clocksource */ | |
307 | writel(0, TIMER1_VA_BASE + TIMER_CTRL); | |
308 | writel(0xffffffff, TIMER1_VA_BASE + TIMER_LOAD); | |
309 | writel(0xffffffff, TIMER1_VA_BASE + TIMER_VALUE); | |
310 | writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC, | |
311 | TIMER1_VA_BASE + TIMER_CTRL); | |
312 | ||
313 | clocksource_bcmring_timer1.mult = | |
314 | clocksource_khz2mult(TIMER1_FREQUENCY_MHZ * 1000, | |
315 | clocksource_bcmring_timer1.shift); | |
316 | clocksource_register(&clocksource_bcmring_timer1); | |
317 | ||
318 | /* setup timer3 as free-running clocksource */ | |
319 | writel(0, TIMER3_VA_BASE + TIMER_CTRL); | |
320 | writel(0xffffffff, TIMER3_VA_BASE + TIMER_LOAD); | |
321 | writel(0xffffffff, TIMER3_VA_BASE + TIMER_VALUE); | |
322 | writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC, | |
323 | TIMER3_VA_BASE + TIMER_CTRL); | |
324 | ||
325 | clocksource_bcmring_timer3.mult = | |
326 | clocksource_khz2mult(TIMER3_FREQUENCY_KHZ, | |
327 | clocksource_bcmring_timer3.shift); | |
328 | clocksource_register(&clocksource_bcmring_timer3); | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Set up timer interrupt, and return the current time in seconds. | |
335 | */ | |
336 | void __init bcmring_init_timer(void) | |
337 | { | |
338 | printk(KERN_INFO "bcmring_init_timer\n"); | |
339 | /* | |
340 | * Initialise to a known state (all timers off) | |
341 | */ | |
342 | writel(0, TIMER0_VA_BASE + TIMER_CTRL); | |
343 | writel(0, TIMER1_VA_BASE + TIMER_CTRL); | |
344 | writel(0, TIMER2_VA_BASE + TIMER_CTRL); | |
345 | writel(0, TIMER3_VA_BASE + TIMER_CTRL); | |
346 | ||
347 | /* | |
348 | * Make irqs happen for the system timer | |
349 | */ | |
350 | setup_irq(IRQ_TIMER0, &bcmring_timer_irq); | |
351 | ||
352 | bcmring_clocksource_init(); | |
353 | ||
354 | timer0_clockevent.mult = | |
355 | div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift); | |
356 | timer0_clockevent.max_delta_ns = | |
357 | clockevent_delta2ns(0xffffffff, &timer0_clockevent); | |
358 | timer0_clockevent.min_delta_ns = | |
359 | clockevent_delta2ns(0xf, &timer0_clockevent); | |
360 | ||
361 | timer0_clockevent.cpumask = cpumask_of(0); | |
362 | clockevents_register_device(&timer0_clockevent); | |
363 | } | |
364 | ||
365 | struct sys_timer bcmring_timer = { | |
366 | .init = bcmring_init_timer, | |
367 | }; |