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authorLinus Torvalds <torvalds@linux-foundation.org>2013-05-04 12:31:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-04 12:31:18 -0700
commit6fa52ed33bea997374a88dbacbba5bf8c7ac4fef (patch)
treea0904b78d66c9b99d6acf944cf58bcaa0cffc511 /arch/arm/mach-zynq
parent1db772216f48978d5146b858586f6178433aad38 (diff)
parentbc8fd900c4d460b4e4bf785bb48bfced0ac9941b (diff)
downloadop-kernel-dev-6fa52ed33bea997374a88dbacbba5bf8c7ac4fef.zip
op-kernel-dev-6fa52ed33bea997374a88dbacbba5bf8c7ac4fef.tar.gz
Merge tag 'drivers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC driver changes from Olof Johansson: "This is a rather large set of patches for device drivers that for one reason or another the subsystem maintainer preferred to get merged through the arm-soc tree. There are both new drivers as well as existing drivers that are getting converted from platform-specific code into standalone drivers using the appropriate subsystem specific interfaces. In particular, we can now have pinctrl, clk, clksource and irqchip drivers in one file per driver, without the need to call into platform specific interface, or to get called from platform specific code, as long as all information about the hardware is provided through a device tree. Most of the drivers we touch this time are for clocksource. Since now most of them are part of drivers/clocksource, I expect that we won't have to touch these again from arm-soc and can let the clocksource maintainers take care of these in the future. Another larger part of this series is specific to the exynos platform, which is seeing some significant effort in upstreaming and modernization of its device drivers this time around, which unfortunately is also the cause for the churn and a lot of the merge conflicts. There is one new subsystem that gets merged as part of this series: the reset controller interface, which is a very simple interface for taking devices on the SoC out of reset or back into reset. Patches to use this interface on i.MX follow later in this merge window, and we are going to have other platforms (at least tegra and sirf) get converted in 3.11. This will let us get rid of platform specific callbacks in a number of platform independent device drivers." * tag 'drivers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (256 commits) irqchip: s3c24xx: add missing __init annotations ARM: dts: Disable the RTC by default on exynos5 clk: exynos5250: Fix parent clock for sclk_mmc{0,1,2,3} ARM: exynos: restore mach/regs-clock.h for exynos5 clocksource: exynos_mct: fix build error on non-DT pinctrl: vt8500: wmt: Fix checking return value of pinctrl_register() irqchip: vt8500: Convert arch-vt8500 to new irqchip infrastructure reset: NULL deref on allocation failure reset: Add reset controller API dt: describe base reset signal binding ARM: EXYNOS: Add arm-pmu DT binding for exynos421x ARM: EXYNOS: Add arm-pmu DT binding for exynos5250 ARM: EXYNOS: Enable PMUs for exynos4 irqchip: exynos-combiner: Correct combined IRQs for exynos4 irqchip: exynos-combiner: Add set_irq_affinity function for combiner_irq ARM: EXYNOS: fix compilation error introduced due to common clock migration clk: exynos5250: Fix divider values for sclk_mmc{0,1,2,3} clk: exynos4: export clocks required for fimc-is clk: samsung: Fix compilation error clk: tegra: fix enum tegra114_clk to match binding ...
Diffstat (limited to 'arch/arm/mach-zynq')
-rw-r--r--arch/arm/mach-zynq/Kconfig1
-rw-r--r--arch/arm/mach-zynq/Makefile2
-rw-r--r--arch/arm/mach-zynq/common.c3
-rw-r--r--arch/arm/mach-zynq/common.h2
-rw-r--r--arch/arm/mach-zynq/timer.c324
5 files changed, 4 insertions, 328 deletions
diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index 138b589..cf3226b 100644
--- a/arch/arm/mach-zynq/Kconfig
+++ b/arch/arm/mach-zynq/Kconfig
@@ -11,5 +11,6 @@ config ARCH_ZYNQ
select MIGHT_HAVE_CACHE_L2X0
select USE_OF
select SPARSE_IRQ
+ select CADENCE_TTC_TIMER
help
Support for Xilinx Zynq ARM Cortex A9 Platform
diff --git a/arch/arm/mach-zynq/Makefile b/arch/arm/mach-zynq/Makefile
index 397268c..320faed 100644
--- a/arch/arm/mach-zynq/Makefile
+++ b/arch/arm/mach-zynq/Makefile
@@ -3,4 +3,4 @@
#
# Common support
-obj-y := common.o timer.o
+obj-y := common.o
diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
index 5c89832..68e0907 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c
@@ -20,6 +20,7 @@
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/clk/zynq.h>
+#include <linux/clocksource.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
@@ -77,7 +78,7 @@ static void __init xilinx_zynq_timer_init(void)
xilinx_zynq_clocks_init(slcr);
- xttcps_timer_init();
+ clocksource_of_init();
}
/**
diff --git a/arch/arm/mach-zynq/common.h b/arch/arm/mach-zynq/common.h
index 8b4dbba..5050bb1 100644
--- a/arch/arm/mach-zynq/common.h
+++ b/arch/arm/mach-zynq/common.h
@@ -17,6 +17,4 @@
#ifndef __MACH_ZYNQ_COMMON_H__
#define __MACH_ZYNQ_COMMON_H__
-void __init xttcps_timer_init(void);
-
#endif
diff --git a/arch/arm/mach-zynq/timer.c b/arch/arm/mach-zynq/timer.c
deleted file mode 100644
index f9fbc9c..0000000
--- a/arch/arm/mach-zynq/timer.c
+++ /dev/null
@@ -1,324 +0,0 @@
-/*
- * This file contains driver for the Xilinx PS Timer Counter IP.
- *
- * Copyright (C) 2011 Xilinx
- *
- * based on arch/mips/kernel/time.c timer driver
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * 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.
- */
-
-#include <linux/interrupt.h>
-#include <linux/clockchips.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/slab.h>
-#include <linux/clk-provider.h>
-#include "common.h"
-
-/*
- * Timer Register Offset Definitions of Timer 1, Increment base address by 4
- * and use same offsets for Timer 2
- */
-#define XTTCPS_CLK_CNTRL_OFFSET 0x00 /* Clock Control Reg, RW */
-#define XTTCPS_CNT_CNTRL_OFFSET 0x0C /* Counter Control Reg, RW */
-#define XTTCPS_COUNT_VAL_OFFSET 0x18 /* Counter Value Reg, RO */
-#define XTTCPS_INTR_VAL_OFFSET 0x24 /* Interval Count Reg, RW */
-#define XTTCPS_ISR_OFFSET 0x54 /* Interrupt Status Reg, RO */
-#define XTTCPS_IER_OFFSET 0x60 /* Interrupt Enable Reg, RW */
-
-#define XTTCPS_CNT_CNTRL_DISABLE_MASK 0x1
-
-/*
- * Setup the timers to use pre-scaling, using a fixed value for now that will
- * work across most input frequency, but it may need to be more dynamic
- */
-#define PRESCALE_EXPONENT 11 /* 2 ^ PRESCALE_EXPONENT = PRESCALE */
-#define PRESCALE 2048 /* The exponent must match this */
-#define CLK_CNTRL_PRESCALE ((PRESCALE_EXPONENT - 1) << 1)
-#define CLK_CNTRL_PRESCALE_EN 1
-#define CNT_CNTRL_RESET (1<<4)
-
-/**
- * struct xttcps_timer - This definition defines local timer structure
- *
- * @base_addr: Base address of timer
- **/
-struct xttcps_timer {
- void __iomem *base_addr;
-};
-
-struct xttcps_timer_clocksource {
- struct xttcps_timer xttc;
- struct clocksource cs;
-};
-
-#define to_xttcps_timer_clksrc(x) \
- container_of(x, struct xttcps_timer_clocksource, cs)
-
-struct xttcps_timer_clockevent {
- struct xttcps_timer xttc;
- struct clock_event_device ce;
- struct clk *clk;
-};
-
-#define to_xttcps_timer_clkevent(x) \
- container_of(x, struct xttcps_timer_clockevent, ce)
-
-/**
- * xttcps_set_interval - Set the timer interval value
- *
- * @timer: Pointer to the timer instance
- * @cycles: Timer interval ticks
- **/
-static void xttcps_set_interval(struct xttcps_timer *timer,
- unsigned long cycles)
-{
- u32 ctrl_reg;
-
- /* Disable the counter, set the counter value and re-enable counter */
- ctrl_reg = __raw_readl(timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET);
- ctrl_reg |= XTTCPS_CNT_CNTRL_DISABLE_MASK;
- __raw_writel(ctrl_reg, timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET);
-
- __raw_writel(cycles, timer->base_addr + XTTCPS_INTR_VAL_OFFSET);
-
- /*
- * Reset the counter (0x10) so that it starts from 0, one-shot
- * mode makes this needed for timing to be right.
- */
- ctrl_reg |= CNT_CNTRL_RESET;
- ctrl_reg &= ~XTTCPS_CNT_CNTRL_DISABLE_MASK;
- __raw_writel(ctrl_reg, timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET);
-}
-
-/**
- * xttcps_clock_event_interrupt - Clock event timer interrupt handler
- *
- * @irq: IRQ number of the Timer
- * @dev_id: void pointer to the xttcps_timer instance
- *
- * returns: Always IRQ_HANDLED - success
- **/
-static irqreturn_t xttcps_clock_event_interrupt(int irq, void *dev_id)
-{
- struct xttcps_timer_clockevent *xttce = dev_id;
- struct xttcps_timer *timer = &xttce->xttc;
-
- /* Acknowledge the interrupt and call event handler */
- __raw_readl(timer->base_addr + XTTCPS_ISR_OFFSET);
-
- xttce->ce.event_handler(&xttce->ce);
-
- return IRQ_HANDLED;
-}
-
-/**
- * __xttc_clocksource_read - Reads the timer counter register
- *
- * returns: Current timer counter register value
- **/
-static cycle_t __xttc_clocksource_read(struct clocksource *cs)
-{
- struct xttcps_timer *timer = &to_xttcps_timer_clksrc(cs)->xttc;
-
- return (cycle_t)__raw_readl(timer->base_addr +
- XTTCPS_COUNT_VAL_OFFSET);
-}
-
-/**
- * xttcps_set_next_event - Sets the time interval for next event
- *
- * @cycles: Timer interval ticks
- * @evt: Address of clock event instance
- *
- * returns: Always 0 - success
- **/
-static int xttcps_set_next_event(unsigned long cycles,
- struct clock_event_device *evt)
-{
- struct xttcps_timer_clockevent *xttce = to_xttcps_timer_clkevent(evt);
- struct xttcps_timer *timer = &xttce->xttc;
-
- xttcps_set_interval(timer, cycles);
- return 0;
-}
-
-/**
- * xttcps_set_mode - Sets the mode of timer
- *
- * @mode: Mode to be set
- * @evt: Address of clock event instance
- **/
-static void xttcps_set_mode(enum clock_event_mode mode,
- struct clock_event_device *evt)
-{
- struct xttcps_timer_clockevent *xttce = to_xttcps_timer_clkevent(evt);
- struct xttcps_timer *timer = &xttce->xttc;
- u32 ctrl_reg;
-
- switch (mode) {
- case CLOCK_EVT_MODE_PERIODIC:
- xttcps_set_interval(timer,
- DIV_ROUND_CLOSEST(clk_get_rate(xttce->clk),
- PRESCALE * HZ));
- break;
- case CLOCK_EVT_MODE_ONESHOT:
- case CLOCK_EVT_MODE_UNUSED:
- case CLOCK_EVT_MODE_SHUTDOWN:
- ctrl_reg = __raw_readl(timer->base_addr +
- XTTCPS_CNT_CNTRL_OFFSET);
- ctrl_reg |= XTTCPS_CNT_CNTRL_DISABLE_MASK;
- __raw_writel(ctrl_reg,
- timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET);
- break;
- case CLOCK_EVT_MODE_RESUME:
- ctrl_reg = __raw_readl(timer->base_addr +
- XTTCPS_CNT_CNTRL_OFFSET);
- ctrl_reg &= ~XTTCPS_CNT_CNTRL_DISABLE_MASK;
- __raw_writel(ctrl_reg,
- timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET);
- break;
- }
-}
-
-static void __init zynq_ttc_setup_clocksource(struct device_node *np,
- void __iomem *base)
-{
- struct xttcps_timer_clocksource *ttccs;
- struct clk *clk;
- int err;
- u32 reg;
-
- ttccs = kzalloc(sizeof(*ttccs), GFP_KERNEL);
- if (WARN_ON(!ttccs))
- return;
-
- err = of_property_read_u32(np, "reg", &reg);
- if (WARN_ON(err))
- return;
-
- clk = of_clk_get_by_name(np, "cpu_1x");
- if (WARN_ON(IS_ERR(clk)))
- return;
-
- err = clk_prepare_enable(clk);
- if (WARN_ON(err))
- return;
-
- ttccs->xttc.base_addr = base + reg * 4;
-
- ttccs->cs.name = np->name;
- ttccs->cs.rating = 200;
- ttccs->cs.read = __xttc_clocksource_read;
- ttccs->cs.mask = CLOCKSOURCE_MASK(16);
- ttccs->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS;
-
- __raw_writel(0x0, ttccs->xttc.base_addr + XTTCPS_IER_OFFSET);
- __raw_writel(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN,
- ttccs->xttc.base_addr + XTTCPS_CLK_CNTRL_OFFSET);
- __raw_writel(CNT_CNTRL_RESET,
- ttccs->xttc.base_addr + XTTCPS_CNT_CNTRL_OFFSET);
-
- err = clocksource_register_hz(&ttccs->cs, clk_get_rate(clk) / PRESCALE);
- if (WARN_ON(err))
- return;
-}
-
-static void __init zynq_ttc_setup_clockevent(struct device_node *np,
- void __iomem *base)
-{
- struct xttcps_timer_clockevent *ttcce;
- int err, irq;
- u32 reg;
-
- ttcce = kzalloc(sizeof(*ttcce), GFP_KERNEL);
- if (WARN_ON(!ttcce))
- return;
-
- err = of_property_read_u32(np, "reg", &reg);
- if (WARN_ON(err))
- return;
-
- ttcce->xttc.base_addr = base + reg * 4;
-
- ttcce->clk = of_clk_get_by_name(np, "cpu_1x");
- if (WARN_ON(IS_ERR(ttcce->clk)))
- return;
-
- err = clk_prepare_enable(ttcce->clk);
- if (WARN_ON(err))
- return;
-
- irq = irq_of_parse_and_map(np, 0);
- if (WARN_ON(!irq))
- return;
-
- ttcce->ce.name = np->name;
- ttcce->ce.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
- ttcce->ce.set_next_event = xttcps_set_next_event;
- ttcce->ce.set_mode = xttcps_set_mode;
- ttcce->ce.rating = 200;
- ttcce->ce.irq = irq;
- ttcce->ce.cpumask = cpu_possible_mask;
-
- __raw_writel(0x23, ttcce->xttc.base_addr + XTTCPS_CNT_CNTRL_OFFSET);
- __raw_writel(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN,
- ttcce->xttc.base_addr + XTTCPS_CLK_CNTRL_OFFSET);
- __raw_writel(0x1, ttcce->xttc.base_addr + XTTCPS_IER_OFFSET);
-
- err = request_irq(irq, xttcps_clock_event_interrupt, IRQF_TIMER,
- np->name, ttcce);
- if (WARN_ON(err))
- return;
-
- clockevents_config_and_register(&ttcce->ce,
- clk_get_rate(ttcce->clk) / PRESCALE,
- 1, 0xfffe);
-}
-
-static const __initconst struct of_device_id zynq_ttc_match[] = {
- { .compatible = "xlnx,ttc-counter-clocksource",
- .data = zynq_ttc_setup_clocksource, },
- { .compatible = "xlnx,ttc-counter-clockevent",
- .data = zynq_ttc_setup_clockevent, },
- {}
-};
-
-/**
- * xttcps_timer_init - Initialize the timer
- *
- * Initializes the timer hardware and register the clock source and clock event
- * timers with Linux kernal timer framework
- **/
-void __init xttcps_timer_init(void)
-{
- struct device_node *np;
-
- for_each_compatible_node(np, NULL, "xlnx,ttc") {
- struct device_node *np_chld;
- void __iomem *base;
-
- base = of_iomap(np, 0);
- if (WARN_ON(!base))
- return;
-
- for_each_available_child_of_node(np, np_chld) {
- int (*cb)(struct device_node *np, void __iomem *base);
- const struct of_device_id *match;
-
- match = of_match_node(zynq_ttc_match, np_chld);
- if (match) {
- cb = match->data;
- cb(np_chld, base);
- }
- }
- }
-}
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