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