2 * linux/arch/arm/mach-integrator/core.c
4 * Copyright (C) 2000-2003 Deep Blue Solutions Ltd
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2, as
8 * published by the Free Software Foundation.
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/device.h>
14 #include <linux/spinlock.h>
15 #include <linux/interrupt.h>
16 #include <linux/irq.h>
17 #include <linux/sched.h>
18 #include <linux/smp.h>
19 #include <linux/termios.h>
20 #include <linux/amba/bus.h>
21 #include <linux/amba/serial.h>
24 #include <asm/clkdev.h>
25 #include <mach/clkdev.h>
26 #include <mach/hardware.h>
28 #include <asm/hardware/arm_timer.h>
30 #include <asm/system.h>
32 #include <asm/mach/time.h>
36 static struct amba_pl010_data integrator_uart_data;
38 static struct amba_device rtc_device = {
43 .start = INTEGRATOR_RTC_BASE,
44 .end = INTEGRATOR_RTC_BASE + SZ_4K - 1,
45 .flags = IORESOURCE_MEM,
47 .irq = { IRQ_RTCINT, NO_IRQ },
48 .periphid = 0x00041030,
51 static struct amba_device uart0_device = {
54 .platform_data = &integrator_uart_data,
57 .start = INTEGRATOR_UART0_BASE,
58 .end = INTEGRATOR_UART0_BASE + SZ_4K - 1,
59 .flags = IORESOURCE_MEM,
61 .irq = { IRQ_UARTINT0, NO_IRQ },
62 .periphid = 0x0041010,
65 static struct amba_device uart1_device = {
68 .platform_data = &integrator_uart_data,
71 .start = INTEGRATOR_UART1_BASE,
72 .end = INTEGRATOR_UART1_BASE + SZ_4K - 1,
73 .flags = IORESOURCE_MEM,
75 .irq = { IRQ_UARTINT1, NO_IRQ },
76 .periphid = 0x0041010,
79 static struct amba_device kmi0_device = {
85 .end = KMI0_BASE + SZ_4K - 1,
86 .flags = IORESOURCE_MEM,
88 .irq = { IRQ_KMIINT0, NO_IRQ },
89 .periphid = 0x00041050,
92 static struct amba_device kmi1_device = {
98 .end = KMI1_BASE + SZ_4K - 1,
99 .flags = IORESOURCE_MEM,
101 .irq = { IRQ_KMIINT1, NO_IRQ },
102 .periphid = 0x00041050,
105 static struct amba_device *amba_devs[] __initdata = {
114 * These are fixed clocks.
116 static struct clk clk24mhz = {
120 static struct clk uartclk = {
124 static struct clk_lookup lookups[] __initdata = {
137 }, { /* MMCI - IntegratorCP */
143 static int __init integrator_init(void)
147 for (i = 0; i < ARRAY_SIZE(lookups); i++)
148 clkdev_add(&lookups[i]);
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);
158 arch_initcall(integrator_init);
161 * On the Integrator platform, the port RTS and DTR are provided by
162 * bits in the following SC_CTRLS register bits:
167 #define SC_CTRLC (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLC_OFFSET)
168 #define SC_CTRLS (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLS_OFFSET)
170 static void integrator_uart_set_mctrl(struct amba_device *dev, void __iomem *base, unsigned int mctrl)
172 unsigned int ctrls = 0, ctrlc = 0, rts_mask, dtr_mask;
174 if (dev == &uart0_device) {
182 if (mctrl & TIOCM_RTS)
187 if (mctrl & TIOCM_DTR)
192 __raw_writel(ctrls, SC_CTRLS);
193 __raw_writel(ctrlc, SC_CTRLC);
196 static struct amba_pl010_data integrator_uart_data = {
197 .set_mctrl = integrator_uart_set_mctrl,
200 #define CM_CTRL IO_ADDRESS(INTEGRATOR_HDR_BASE) + INTEGRATOR_HDR_CTRL_OFFSET
202 static DEFINE_SPINLOCK(cm_lock);
205 * cm_control - update the CM_CTRL register.
206 * @mask: bits to change
209 void cm_control(u32 mask, u32 set)
214 spin_lock_irqsave(&cm_lock, flags);
215 val = readl(CM_CTRL) & ~mask;
216 writel(val | set, CM_CTRL);
217 spin_unlock_irqrestore(&cm_lock, flags);
220 EXPORT_SYMBOL(cm_control);
223 * Where is the timer (VA)?
225 #define TIMER0_VA_BASE (IO_ADDRESS(INTEGRATOR_CT_BASE)+0x00000000)
226 #define TIMER1_VA_BASE (IO_ADDRESS(INTEGRATOR_CT_BASE)+0x00000100)
227 #define TIMER2_VA_BASE (IO_ADDRESS(INTEGRATOR_CT_BASE)+0x00000200)
228 #define VA_IC_BASE IO_ADDRESS(INTEGRATOR_IC_BASE)
231 * How long is the timer interval?
233 #define TIMER_INTERVAL (TICKS_PER_uSEC * mSEC_10)
234 #if TIMER_INTERVAL >= 0x100000
235 #define TICKS2USECS(x) (256 * (x) / TICKS_PER_uSEC)
236 #elif TIMER_INTERVAL >= 0x10000
237 #define TICKS2USECS(x) (16 * (x) / TICKS_PER_uSEC)
239 #define TICKS2USECS(x) ((x) / TICKS_PER_uSEC)
242 static unsigned long timer_reload;
245 * Returns number of ms since last clock interrupt. Note that interrupts
246 * will have been disabled by do_gettimeoffset()
248 unsigned long integrator_gettimeoffset(void)
250 unsigned long ticks1, ticks2, status;
253 * Get the current number of ticks. Note that there is a race
254 * condition between us reading the timer and checking for
255 * an interrupt. We get around this by ensuring that the
256 * counter has not reloaded between our two reads.
258 ticks2 = readl(TIMER1_VA_BASE + TIMER_VALUE) & 0xffff;
261 status = __raw_readl(VA_IC_BASE + IRQ_RAW_STATUS);
262 ticks2 = readl(TIMER1_VA_BASE + TIMER_VALUE) & 0xffff;
263 } while (ticks2 > ticks1);
266 * Number of ticks since last interrupt.
268 ticks1 = timer_reload - ticks2;
271 * Interrupt pending? If so, we've reloaded once already.
273 if (status & (1 << IRQ_TIMERINT1))
274 ticks1 += timer_reload;
277 * Convert the ticks to usecs
279 return TICKS2USECS(ticks1);
283 * IRQ handler for the timer
286 integrator_timer_interrupt(int irq, void *dev_id)
289 * clear the interrupt
291 writel(1, TIMER1_VA_BASE + TIMER_INTCLR);
298 static struct irqaction integrator_timer_irq = {
299 .name = "Integrator Timer Tick",
300 .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
301 .handler = integrator_timer_interrupt,
305 * Set up timer interrupt, and return the current time in seconds.
307 void __init integrator_time_init(unsigned long reload, unsigned int ctrl)
309 unsigned int timer_ctrl = TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC;
311 timer_reload = reload;
314 if (timer_reload > 0x100000) {
316 timer_ctrl |= TIMER_CTRL_DIV256;
317 } else if (timer_reload > 0x010000) {
319 timer_ctrl |= TIMER_CTRL_DIV16;
323 * Initialise to a known state (all timers off)
325 writel(0, TIMER0_VA_BASE + TIMER_CTRL);
326 writel(0, TIMER1_VA_BASE + TIMER_CTRL);
327 writel(0, TIMER2_VA_BASE + TIMER_CTRL);
329 writel(timer_reload, TIMER1_VA_BASE + TIMER_LOAD);
330 writel(timer_reload, TIMER1_VA_BASE + TIMER_VALUE);
331 writel(timer_ctrl, TIMER1_VA_BASE + TIMER_CTRL);
334 * Make irqs happen for the system timer
336 setup_irq(IRQ_TIMERINT1, &integrator_timer_irq);