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Message-ID: <8628FE4E7912BF47A96AE7DD7BAC0AADCB25BA6C11@SJEXCHCCR02.corp.ad.broadcom.com>
Date: Fri, 3 Jul 2009 18:43:12 -0700
From: "Leo (Hao) Chen" <leochen@...adcom.com>
To: "linux-arm-kernel@...ts.arm.linux.org.uk"
<linux-arm-kernel@...ts.arm.linux.org.uk>,
"Linux Kernel" <linux-kernel@...r.kernel.org>
cc: "Russell King - ARM Linux" <linux@....linux.org.uk>,
"Alan Cox" <alan@...rguk.ukuu.org.uk>,
"Jean-Christophe PLAGNIOL-VILLARD" <plagnioj@...osoft.com>,
"Scott Branden" <sbranden@...adcom.com>,
"Leo (Hao) Chen" <leochen@...adcom.com>
Subject: [PATCH v2 4/18] new ARM SoC support: BCMRing
>From bb9f09c2155b1d699530c045af8cd4b44deb5983 Mon Sep 17 00:00:00 2001
From: Leo Chen <leochen@...adcom.com>
Date: Fri, 3 Jul 2009 16:20:47 -0700
Subject: [PATCH 04/18] add mach-bcmring/core.c core.h
add core.c/core.h, with bcmring timer init, clocksource init, amba init functions
Signed-off-by: Leo Chen <leochen@...adcom.com>
---
arch/arm/mach-bcmring/core.c | 348 ++++++++++++++++++++++++++++++++++++++++++
arch/arm/mach-bcmring/core.h | 49 ++++++
2 files changed, 397 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-bcmring/core.c
create mode 100644 arch/arm/mach-bcmring/core.h
diff --git a/arch/arm/mach-bcmring/core.c b/arch/arm/mach-bcmring/core.c
new file mode 100644
index 0000000..cb94569
--- /dev/null
+++ b/arch/arm/mach-bcmring/core.c
@@ -0,0 +1,348 @@
+/*
+ * 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 <mach/hardware.h>
+#include <asm/clkdev.h>
+#include <asm/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 "core.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>
+
+/* DevChip Primecells */
+AMBA_DEVICE(uartA, "dev:f1", UARTA, NULL, SZ_4K);
+AMBA_DEVICE(uartB, "dev:f2", 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 = "dev:f1",
+ .clk = &uart_clk,
+ }, { /* UART1 */
+ .dev_id = "dev:f2",
+ .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(amba_devs); i++) {
+ struct amba_device *d = amba_devs[i];
+ amba_device_register(d, &iomem_resource);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(lookups); i++)
+ clkdev_add(&lookups[i]);
+}
+
+/*
+ * 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,
+};
diff --git a/arch/arm/mach-bcmring/core.h b/arch/arm/mach-bcmring/core.h
new file mode 100644
index 0000000..9d58e51
--- /dev/null
+++ b/arch/arm/mach-bcmring/core.h
@@ -0,0 +1,49 @@
+/*
+ * linux/arch/arm/mach-versatile/core.h
+ *
+ * Copyright (C) 2004 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 */
+#ifndef __ASM_ARCH_BCMRING_H
+#define __ASM_ARCH_BCMRING_H
+
+#include <linux/version.h>
+#include <linux/amba/bus.h>
+#include <mach/csp/mm_addr.h>
+
+void __init bcmring_amba_init(void);
+
+#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 \
+ } \
+}
+
+#endif
--
1.6.0.6
Leo Hao Chen
Software Engineer
Broadcom Canada Inc.
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