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Diffstat (limited to 'arch/arm/mach-bcmring/core.c')
| -rw-r--r-- | arch/arm/mach-bcmring/core.c | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/arch/arm/mach-bcmring/core.c b/arch/arm/mach-bcmring/core.c new file mode 100644 index 0000000..492c649 --- /dev/null +++ b/arch/arm/mach-bcmring/core.c @@ -0,0 +1,367 @@ +/* + * derived from linux/arch/arm/mach-versatile/core.c + * linux/arch/arm/mach-bcmring/core.c + * + * Copyright (C) 1999 - 2003 ARM Limited + * Copyright (C) 2000 Deep Blue Solutions Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +/* Portions copyright Broadcom 2008 */ + +#include <linux/init.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/platform_device.h> +#include <linux/sysdev.h> +#include <linux/interrupt.h> +#include <linux/amba/bus.h> +#include <linux/clocksource.h> +#include <linux/clockchips.h> + +#include <linux/amba/bus.h> +#include <mach/csp/mm_addr.h> +#include <mach/hardware.h> +#include <asm/clkdev.h> +#include <linux/io.h> +#include <asm/irq.h> +#include <asm/hardware/arm_timer.h> +#include <asm/mach-types.h> + +#include <asm/mach/arch.h> +#include <asm/mach/flash.h> +#include <asm/mach/irq.h> +#include <asm/mach/time.h> +#include <asm/mach/map.h> +#include <asm/mach/mmc.h> + +#include <cfg_global.h> + +#include "clock.h" + +#include <csp/secHw.h> +#include <mach/csp/secHw_def.h> +#include <mach/csp/chipcHw_inline.h> +#include <mach/csp/tmrHw_reg.h> + +#define AMBA_DEVICE(name, initname, base, plat, size) \ +static struct amba_device name##_device = { \ + .dev = { \ + .coherent_dma_mask = ~0, \ + .init_name = initname, \ + .platform_data = plat \ + }, \ + .res = { \ + .start = MM_ADDR_IO_##base, \ + .end = MM_ADDR_IO_##base + (size) - 1, \ + .flags = IORESOURCE_MEM \ + }, \ + .dma_mask = ~0, \ + .irq = { \ + IRQ_##base \ + } \ +} + + +AMBA_DEVICE(uartA, "uarta", UARTA, NULL, SZ_4K); +AMBA_DEVICE(uartB, "uartb", UARTB, NULL, SZ_4K); + +static struct clk pll1_clk = { + .name = "PLL1", + .type = CLK_TYPE_PRIMARY | CLK_TYPE_PLL1, + .rate_hz = 2000000000, + .use_cnt = 7, +}; + +static struct clk uart_clk = { + .name = "UART", + .type = CLK_TYPE_PROGRAMMABLE, + .csp_id = chipcHw_CLOCK_UART, + .rate_hz = HW_CFG_UART_CLK_HZ, + .parent = &pll1_clk, +}; + +static struct clk_lookup lookups[] = { + { /* UART0 */ + .dev_id = "uarta", + .clk = &uart_clk, + }, { /* UART1 */ + .dev_id = "uartb", + .clk = &uart_clk, + } +}; + +static struct amba_device *amba_devs[] __initdata = { + &uartA_device, + &uartB_device, +}; + +void __init bcmring_amba_init(void) +{ + int i; + u32 bus_clock; + +/* Linux is run initially in non-secure mode. Secure peripherals */ +/* generate FIQ, and must be handled in secure mode. Until we have */ +/* a linux security monitor implementation, keep everything in */ +/* non-secure mode. */ + chipcHw_busInterfaceClockEnable(chipcHw_REG_BUS_CLOCK_SPU); + secHw_setUnsecure(secHw_BLK_MASK_CHIP_CONTROL | + secHw_BLK_MASK_KEY_SCAN | + secHw_BLK_MASK_TOUCH_SCREEN | + secHw_BLK_MASK_UART0 | + secHw_BLK_MASK_UART1 | + secHw_BLK_MASK_WATCHDOG | + secHw_BLK_MASK_SPUM | + secHw_BLK_MASK_DDR2 | + secHw_BLK_MASK_SPU | + secHw_BLK_MASK_PKA | + secHw_BLK_MASK_RNG | + secHw_BLK_MASK_RTC | + secHw_BLK_MASK_OTP | + secHw_BLK_MASK_BOOT | + secHw_BLK_MASK_MPU | + secHw_BLK_MASK_TZCTRL | secHw_BLK_MASK_INTR); + + /* Only the devices attached to the AMBA bus are enabled just before the bus is */ + /* scanned and the drivers are loaded. The clocks need to be on for the AMBA bus */ + /* driver to access these blocks. The bus is probed, and the drivers are loaded. */ + /* FIXME Need to remove enable of PIF once CLCD clock enable used properly in FPGA. */ + bus_clock = chipcHw_REG_BUS_CLOCK_GE + | chipcHw_REG_BUS_CLOCK_SDIO0 | chipcHw_REG_BUS_CLOCK_SDIO1; + + chipcHw_busInterfaceClockEnable(bus_clock); + + for (i = 0; i < ARRAY_SIZE(lookups); i++) + clkdev_add(&lookups[i]); + + for (i = 0; i < ARRAY_SIZE(amba_devs); i++) { + struct amba_device *d = amba_devs[i]; + amba_device_register(d, &iomem_resource); + } +} + +/* + * Where is the timer (VA)? + */ +#define TIMER0_VA_BASE MM_IO_BASE_TMR +#define TIMER1_VA_BASE (MM_IO_BASE_TMR + 0x20) +#define TIMER2_VA_BASE (MM_IO_BASE_TMR + 0x40) +#define TIMER3_VA_BASE (MM_IO_BASE_TMR + 0x60) + +/* Timer 0 - 25 MHz, Timer3 at bus clock rate, typically 150-166 MHz */ +#if defined(CONFIG_ARCH_FPGA11107) +/* fpga cpu/bus are currently 30 times slower so scale frequency as well to */ +/* slow down Linux's sense of time */ +#define TIMER0_FREQUENCY_MHZ (tmrHw_LOW_FREQUENCY_MHZ * 30) +#define TIMER1_FREQUENCY_MHZ (tmrHw_LOW_FREQUENCY_MHZ * 30) +#define TIMER3_FREQUENCY_MHZ (tmrHw_HIGH_FREQUENCY_MHZ * 30) +#define TIMER3_FREQUENCY_KHZ (tmrHw_HIGH_FREQUENCY_HZ / 1000 * 30) +#else +#define TIMER0_FREQUENCY_MHZ tmrHw_LOW_FREQUENCY_MHZ +#define TIMER1_FREQUENCY_MHZ tmrHw_LOW_FREQUENCY_MHZ +#define TIMER3_FREQUENCY_MHZ tmrHw_HIGH_FREQUENCY_MHZ +#define TIMER3_FREQUENCY_KHZ (tmrHw_HIGH_FREQUENCY_HZ / 1000) +#endif + +#define TICKS_PER_uSEC TIMER0_FREQUENCY_MHZ + +/* + * These are useconds NOT ticks. + * + */ +#define mSEC_1 1000 +#define mSEC_5 (mSEC_1 * 5) +#define mSEC_10 (mSEC_1 * 10) +#define mSEC_25 (mSEC_1 * 25) +#define SEC_1 (mSEC_1 * 1000) + +/* + * How long is the timer interval? + */ +#define TIMER_INTERVAL (TICKS_PER_uSEC * mSEC_10) +#if TIMER_INTERVAL >= 0x100000 +#define TIMER_RELOAD (TIMER_INTERVAL >> 8) +#define TIMER_DIVISOR (TIMER_CTRL_DIV256) +#define TICKS2USECS(x) (256 * (x) / TICKS_PER_uSEC) +#elif TIMER_INTERVAL >= 0x10000 +#define TIMER_RELOAD (TIMER_INTERVAL >> 4) /* Divide by 16 */ +#define TIMER_DIVISOR (TIMER_CTRL_DIV16) +#define TICKS2USECS(x) (16 * (x) / TICKS_PER_uSEC) +#else +#define TIMER_RELOAD (TIMER_INTERVAL) +#define TIMER_DIVISOR (TIMER_CTRL_DIV1) +#define TICKS2USECS(x) ((x) / TICKS_PER_uSEC) +#endif + +static void timer_set_mode(enum clock_event_mode mode, + struct clock_event_device *clk) +{ + unsigned long ctrl; + + switch (mode) { + case CLOCK_EVT_MODE_PERIODIC: + writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD); + + ctrl = TIMER_CTRL_PERIODIC; + ctrl |= + TIMER_DIVISOR | TIMER_CTRL_32BIT | TIMER_CTRL_IE | + TIMER_CTRL_ENABLE; + break; + case CLOCK_EVT_MODE_ONESHOT: + /* period set, and timer enabled in 'next_event' hook */ + ctrl = TIMER_CTRL_ONESHOT; + ctrl |= TIMER_DIVISOR | TIMER_CTRL_32BIT | TIMER_CTRL_IE; + break; + case CLOCK_EVT_MODE_UNUSED: + case CLOCK_EVT_MODE_SHUTDOWN: + default: + ctrl = 0; + } + + writel(ctrl, TIMER0_VA_BASE + TIMER_CTRL); +} + +static int timer_set_next_event(unsigned long evt, + struct clock_event_device *unused) +{ + unsigned long ctrl = readl(TIMER0_VA_BASE + TIMER_CTRL); + + writel(evt, TIMER0_VA_BASE + TIMER_LOAD); + writel(ctrl | TIMER_CTRL_ENABLE, TIMER0_VA_BASE + TIMER_CTRL); + + return 0; +} + +static struct clock_event_device timer0_clockevent = { + .name = "timer0", + .shift = 32, + .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, + .set_mode = timer_set_mode, + .set_next_event = timer_set_next_event, +}; + +/* + * IRQ handler for the timer + */ +static irqreturn_t bcmring_timer_interrupt(int irq, void *dev_id) +{ + struct clock_event_device *evt = &timer0_clockevent; + + writel(1, TIMER0_VA_BASE + TIMER_INTCLR); + + evt->event_handler(evt); + + return IRQ_HANDLED; +} + +static struct irqaction bcmring_timer_irq = { + .name = "bcmring Timer Tick", + .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, + .handler = bcmring_timer_interrupt, +}; + +static cycle_t bcmring_get_cycles_timer1(void) +{ + return ~readl(TIMER1_VA_BASE + TIMER_VALUE); +} + +static cycle_t bcmring_get_cycles_timer3(void) +{ + return ~readl(TIMER3_VA_BASE + TIMER_VALUE); +} + +static struct clocksource clocksource_bcmring_timer1 = { + .name = "timer1", + .rating = 200, + .read = bcmring_get_cycles_timer1, + .mask = CLOCKSOURCE_MASK(32), + .shift = 20, + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +static struct clocksource clocksource_bcmring_timer3 = { + .name = "timer3", + .rating = 100, + .read = bcmring_get_cycles_timer3, + .mask = CLOCKSOURCE_MASK(32), + .shift = 20, + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +static int __init bcmring_clocksource_init(void) +{ + /* setup timer1 as free-running clocksource */ + writel(0, TIMER1_VA_BASE + TIMER_CTRL); + writel(0xffffffff, TIMER1_VA_BASE + TIMER_LOAD); + writel(0xffffffff, TIMER1_VA_BASE + TIMER_VALUE); + writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC, + TIMER1_VA_BASE + TIMER_CTRL); + + clocksource_bcmring_timer1.mult = + clocksource_khz2mult(TIMER1_FREQUENCY_MHZ * 1000, + clocksource_bcmring_timer1.shift); + clocksource_register(&clocksource_bcmring_timer1); + + /* setup timer3 as free-running clocksource */ + writel(0, TIMER3_VA_BASE + TIMER_CTRL); + writel(0xffffffff, TIMER3_VA_BASE + TIMER_LOAD); + writel(0xffffffff, TIMER3_VA_BASE + TIMER_VALUE); + writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC, + TIMER3_VA_BASE + TIMER_CTRL); + + clocksource_bcmring_timer3.mult = + clocksource_khz2mult(TIMER3_FREQUENCY_KHZ, + clocksource_bcmring_timer3.shift); + clocksource_register(&clocksource_bcmring_timer3); + + return 0; +} + +/* + * Set up timer interrupt, and return the current time in seconds. + */ +void __init bcmring_init_timer(void) +{ + printk(KERN_INFO "bcmring_init_timer\n"); + /* + * Initialise to a known state (all timers off) + */ + writel(0, TIMER0_VA_BASE + TIMER_CTRL); + writel(0, TIMER1_VA_BASE + TIMER_CTRL); + writel(0, TIMER2_VA_BASE + TIMER_CTRL); + writel(0, TIMER3_VA_BASE + TIMER_CTRL); + + /* + * Make irqs happen for the system timer + */ + setup_irq(IRQ_TIMER0, &bcmring_timer_irq); + + bcmring_clocksource_init(); + + timer0_clockevent.mult = + div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift); + timer0_clockevent.max_delta_ns = + clockevent_delta2ns(0xffffffff, &timer0_clockevent); + timer0_clockevent.min_delta_ns = + clockevent_delta2ns(0xf, &timer0_clockevent); + + timer0_clockevent.cpumask = cpumask_of(0); + clockevents_register_device(&timer0_clockevent); +} + +struct sys_timer bcmring_timer = { + .init = bcmring_init_timer, +}; |
