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authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-04 02:55:55 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-04 02:55:55 +0300
commit807249d3ada1ff28a47c4054ca4edd479421b671 (patch)
treea9051ff7b4c31670ac89bb037c90d5baf90d449d /drivers/clocksource
parentff474e8ca8547d09cb82ebab56d4c96f9eea01ce (diff)
parent2db97045aa40da4312f7321845bc52b136c8603a (diff)
downloadlinux-807249d3ada1ff28a47c4054ca4edd479421b671.tar.xz
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
Pull MIPS updates from Ralf Baechle: "This is the main pull request for 4.3 for MIPS. Here's the summary: Three fixes that didn't make 4.2-stable: - a -Os build might compile the kernel using the MIPS16 instruction set but the R2 optimized inline functions in <uapi/asm/swab.h> are implemented using 32-bit wide instructions which is invalid. - a build error in pgtable-bits.h for a particular kernel configuration. - accessing registers of the CM GCR might have been compiled to use 64 bit accesses but these registers are onl 32 bit wide. And also a few new bits: - move the ATH79 GPIO driver to drivers/gpio - the definition of IRQCHIP_DECLARE has moved to linux/irqchip.h, change ATH79 accordingly. - fix definition of pgprot_writecombine - add an implementation of dma_map_ops.mmap - fix alignment of quiet build output for vmlinuz link - BCM47xx: Use kmemdup rather than duplicating its implementation - Netlogic: Fix 0x0x prefixes of constants. - merge Bjorn Helgaas' series to remove most of the weak keywords from function declarations. - CP0 and CP1 registers are best considered treated as unsigned values to avoid large values from becoming negative values. - improve support for the MIPS GIC timer. - enable common clock framework for Malta and SEAD3. - a number of improvments and fixes to dump_tlb(). - document the MIPS TLB dump functionality in Magic SysRq. - Cavium Octeon CN68XX improvments. - NetLogic improvments. - irq: Use access helper irq_data_get_affinity_mask. - handle MSA unaligned accesses. - a number of R6-related math-emu fixes. - support for I6400. - improvments to MSA support. - add uprobes support. - move from deprecated __initcall to arch_initcall. - remove finish_arch_switch(). - IRQ cleanups by Thomas Gleixner. - migrate to new 'set-state' interface. - random small cleanups" * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (148 commits) MIPS: UAPI: Fix unrecognized opcode WSBH/DSBH/DSHD when using MIPS16. MIPS: Fix alignment of quiet build output for vmlinuz link MIPS: math-emu: Remove unused handle_dsemul function declaration MIPS: math-emu: Add support for the MIPS R6 MAX{, A} FPU instruction MIPS: math-emu: Add support for the MIPS R6 MIN{, A} FPU instruction MIPS: math-emu: Add support for the MIPS R6 CLASS FPU instruction MIPS: math-emu: Add support for the MIPS R6 RINT FPU instruction MIPS: math-emu: Add support for the MIPS R6 MSUBF FPU instruction MIPS: math-emu: Add support for the MIPS R6 MADDF FPU instruction MIPS: math-emu: Add support for the MIPS R6 SELNEZ FPU instruction MIPS: math-emu: Add support for the MIPS R6 SELEQZ FPU instruction MIPS: math-emu: Add support for the CMP.condn.fmt R6 instruction MIPS: inst.h: Add new MIPS R6 FPU opcodes MIPS: Octeon: Fix management port MII address on Kontron S1901 MIPS: BCM47xx: Use kmemdup rather than duplicating its implementation STAGING: Octeon: Use common helpers for determining interface and port MIPS: Octeon: Support interfaces 4 and 5 MIPS: Octeon: Set up 1:1 mapping between CN68XX PKO queues and ports MIPS: Octeon: Initialize CN68XX PKO STAGING: Octeon: Support CN68XX style WQE ...
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/Kconfig4
-rw-r--r--drivers/clocksource/Makefile1
-rw-r--r--drivers/clocksource/mips-gic-timer.c65
-rw-r--r--drivers/clocksource/time-pistachio.c217
4 files changed, 278 insertions, 9 deletions
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index c03f04d82c6a..552c9b134cc5 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -111,6 +111,10 @@ config CLKSRC_LPC32XX
select CLKSRC_MMIO
select CLKSRC_OF
+config CLKSRC_PISTACHIO
+ bool
+ select CLKSRC_OF
+
config CLKSRC_STM32
bool "Clocksource for STM32 SoCs" if !ARCH_STM32
depends on OF && ARM && (ARCH_STM32 || COMPILE_TEST)
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index f228354961ca..066337e24737 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_FSL_FTM_TIMER) += fsl_ftm_timer.o
obj-$(CONFIG_VF_PIT_TIMER) += vf_pit_timer.o
obj-$(CONFIG_CLKSRC_QCOM) += qcom-timer.o
obj-$(CONFIG_MTK_TIMER) += mtk_timer.o
+obj-$(CONFIG_CLKSRC_PISTACHIO) += time-pistachio.o
obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o
obj-$(CONFIG_ARM_GLOBAL_TIMER) += arm_global_timer.o
diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c
index c3810b61c815..02a1945e5093 100644
--- a/drivers/clocksource/mips-gic-timer.c
+++ b/drivers/clocksource/mips-gic-timer.c
@@ -72,6 +72,13 @@ static void gic_clockevent_cpu_exit(struct clock_event_device *cd)
disable_percpu_irq(gic_timer_irq);
}
+static void gic_update_frequency(void *data)
+{
+ unsigned long rate = (unsigned long)data;
+
+ clockevents_update_freq(this_cpu_ptr(&gic_clockevent_device), rate);
+}
+
static int gic_cpu_notifier(struct notifier_block *nb, unsigned long action,
void *data)
{
@@ -87,18 +94,40 @@ static int gic_cpu_notifier(struct notifier_block *nb, unsigned long action,
return NOTIFY_OK;
}
+static int gic_clk_notifier(struct notifier_block *nb, unsigned long action,
+ void *data)
+{
+ struct clk_notifier_data *cnd = data;
+
+ if (action == POST_RATE_CHANGE)
+ on_each_cpu(gic_update_frequency, (void *)cnd->new_rate, 1);
+
+ return NOTIFY_OK;
+}
+
+
static struct notifier_block gic_cpu_nb = {
.notifier_call = gic_cpu_notifier,
};
+static struct notifier_block gic_clk_nb = {
+ .notifier_call = gic_clk_notifier,
+};
+
static int gic_clockevent_init(void)
{
+ int ret;
+
if (!cpu_has_counter || !gic_frequency)
return -ENXIO;
- setup_percpu_irq(gic_timer_irq, &gic_compare_irqaction);
+ ret = setup_percpu_irq(gic_timer_irq, &gic_compare_irqaction);
+ if (ret < 0)
+ return ret;
- register_cpu_notifier(&gic_cpu_nb);
+ ret = register_cpu_notifier(&gic_cpu_nb);
+ if (ret < 0)
+ pr_warn("GIC: Unable to register CPU notifier\n");
gic_clockevent_cpu_init(this_cpu_ptr(&gic_clockevent_device));
@@ -118,18 +147,17 @@ static struct clocksource gic_clocksource = {
static void __init __gic_clocksource_init(void)
{
+ int ret;
+
/* Set clocksource mask. */
gic_clocksource.mask = CLOCKSOURCE_MASK(gic_get_count_width());
/* Calculate a somewhat reasonable rating value. */
gic_clocksource.rating = 200 + gic_frequency / 10000000;
- clocksource_register_hz(&gic_clocksource, gic_frequency);
-
- gic_clockevent_init();
-
- /* And finally start the counter */
- gic_start_count();
+ ret = clocksource_register_hz(&gic_clocksource, gic_frequency);
+ if (ret < 0)
+ pr_warn("GIC: Unable to register clocksource\n");
}
void __init gic_clocksource_init(unsigned int frequency)
@@ -139,11 +167,16 @@ void __init gic_clocksource_init(unsigned int frequency)
GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_COMPARE);
__gic_clocksource_init();
+ gic_clockevent_init();
+
+ /* And finally start the counter */
+ gic_start_count();
}
static void __init gic_clocksource_of_init(struct device_node *node)
{
struct clk *clk;
+ int ret;
if (WARN_ON(!gic_present || !node->parent ||
!of_device_is_compatible(node->parent, "mti,gic")))
@@ -151,8 +184,13 @@ static void __init gic_clocksource_of_init(struct device_node *node)
clk = of_clk_get(node, 0);
if (!IS_ERR(clk)) {
+ if (clk_prepare_enable(clk) < 0) {
+ pr_err("GIC failed to enable clock\n");
+ clk_put(clk);
+ return;
+ }
+
gic_frequency = clk_get_rate(clk);
- clk_put(clk);
} else if (of_property_read_u32(node, "clock-frequency",
&gic_frequency)) {
pr_err("GIC frequency not specified.\n");
@@ -165,6 +203,15 @@ static void __init gic_clocksource_of_init(struct device_node *node)
}
__gic_clocksource_init();
+
+ ret = gic_clockevent_init();
+ if (!ret && !IS_ERR(clk)) {
+ if (clk_notifier_register(clk, &gic_clk_nb) < 0)
+ pr_warn("GIC: Unable to register clock notifier\n");
+ }
+
+ /* And finally start the counter */
+ gic_start_count();
}
CLOCKSOURCE_OF_DECLARE(mips_gic_timer, "mti,gic-timer",
gic_clocksource_of_init);
diff --git a/drivers/clocksource/time-pistachio.c b/drivers/clocksource/time-pistachio.c
new file mode 100644
index 000000000000..18d4266c2986
--- /dev/null
+++ b/drivers/clocksource/time-pistachio.c
@@ -0,0 +1,217 @@
+/*
+ * Pistachio clocksource based on general-purpose timers
+ *
+ * Copyright (C) 2015 Imagination Technologies
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/clk.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/sched_clock.h>
+#include <linux/time.h>
+
+/* Top level reg */
+#define CR_TIMER_CTRL_CFG 0x00
+#define TIMER_ME_GLOBAL BIT(0)
+#define CR_TIMER_REV 0x10
+
+/* Timer specific registers */
+#define TIMER_CFG 0x20
+#define TIMER_ME_LOCAL BIT(0)
+#define TIMER_RELOAD_VALUE 0x24
+#define TIMER_CURRENT_VALUE 0x28
+#define TIMER_CURRENT_OVERFLOW_VALUE 0x2C
+#define TIMER_IRQ_STATUS 0x30
+#define TIMER_IRQ_CLEAR 0x34
+#define TIMER_IRQ_MASK 0x38
+
+#define PERIP_TIMER_CONTROL 0x90
+
+/* Timer specific configuration Values */
+#define RELOAD_VALUE 0xffffffff
+
+struct pistachio_clocksource {
+ void __iomem *base;
+ raw_spinlock_t lock;
+ struct clocksource cs;
+};
+
+static struct pistachio_clocksource pcs_gpt;
+
+#define to_pistachio_clocksource(cs) \
+ container_of(cs, struct pistachio_clocksource, cs)
+
+static inline u32 gpt_readl(void __iomem *base, u32 offset, u32 gpt_id)
+{
+ return readl(base + 0x20 * gpt_id + offset);
+}
+
+static inline void gpt_writel(void __iomem *base, u32 value, u32 offset,
+ u32 gpt_id)
+{
+ writel(value, base + 0x20 * gpt_id + offset);
+}
+
+static cycle_t pistachio_clocksource_read_cycles(struct clocksource *cs)
+{
+ struct pistachio_clocksource *pcs = to_pistachio_clocksource(cs);
+ u32 counter, overflw;
+ unsigned long flags;
+
+ /*
+ * The counter value is only refreshed after the overflow value is read.
+ * And they must be read in strict order, hence raw spin lock added.
+ */
+
+ raw_spin_lock_irqsave(&pcs->lock, flags);
+ overflw = gpt_readl(pcs->base, TIMER_CURRENT_OVERFLOW_VALUE, 0);
+ counter = gpt_readl(pcs->base, TIMER_CURRENT_VALUE, 0);
+ raw_spin_unlock_irqrestore(&pcs->lock, flags);
+
+ return ~(cycle_t)counter;
+}
+
+static u64 notrace pistachio_read_sched_clock(void)
+{
+ return pistachio_clocksource_read_cycles(&pcs_gpt.cs);
+}
+
+static void pistachio_clksrc_set_mode(struct clocksource *cs, int timeridx,
+ int enable)
+{
+ struct pistachio_clocksource *pcs = to_pistachio_clocksource(cs);
+ u32 val;
+
+ val = gpt_readl(pcs->base, TIMER_CFG, timeridx);
+ if (enable)
+ val |= TIMER_ME_LOCAL;
+ else
+ val &= ~TIMER_ME_LOCAL;
+
+ gpt_writel(pcs->base, val, TIMER_CFG, timeridx);
+}
+
+static void pistachio_clksrc_enable(struct clocksource *cs, int timeridx)
+{
+ struct pistachio_clocksource *pcs = to_pistachio_clocksource(cs);
+
+ /* Disable GPT local before loading reload value */
+ pistachio_clksrc_set_mode(cs, timeridx, false);
+ gpt_writel(pcs->base, RELOAD_VALUE, TIMER_RELOAD_VALUE, timeridx);
+ pistachio_clksrc_set_mode(cs, timeridx, true);
+}
+
+static void pistachio_clksrc_disable(struct clocksource *cs, int timeridx)
+{
+ /* Disable GPT local */
+ pistachio_clksrc_set_mode(cs, timeridx, false);
+}
+
+static int pistachio_clocksource_enable(struct clocksource *cs)
+{
+ pistachio_clksrc_enable(cs, 0);
+ return 0;
+}
+
+static void pistachio_clocksource_disable(struct clocksource *cs)
+{
+ pistachio_clksrc_disable(cs, 0);
+}
+
+/* Desirable clock source for pistachio platform */
+static struct pistachio_clocksource pcs_gpt = {
+ .cs = {
+ .name = "gptimer",
+ .rating = 300,
+ .enable = pistachio_clocksource_enable,
+ .disable = pistachio_clocksource_disable,
+ .read = pistachio_clocksource_read_cycles,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS |
+ CLOCK_SOURCE_SUSPEND_NONSTOP,
+ },
+};
+
+static void __init pistachio_clksrc_of_init(struct device_node *node)
+{
+ struct clk *sys_clk, *fast_clk;
+ struct regmap *periph_regs;
+ unsigned long rate;
+ int ret;
+
+ pcs_gpt.base = of_iomap(node, 0);
+ if (!pcs_gpt.base) {
+ pr_err("cannot iomap\n");
+ return;
+ }
+
+ periph_regs = syscon_regmap_lookup_by_phandle(node, "img,cr-periph");
+ if (IS_ERR(periph_regs)) {
+ pr_err("cannot get peripheral regmap (%lu)\n",
+ PTR_ERR(periph_regs));
+ return;
+ }
+
+ /* Switch to using the fast counter clock */
+ ret = regmap_update_bits(periph_regs, PERIP_TIMER_CONTROL,
+ 0xf, 0x0);
+ if (ret)
+ return;
+
+ sys_clk = of_clk_get_by_name(node, "sys");
+ if (IS_ERR(sys_clk)) {
+ pr_err("clock get failed (%lu)\n", PTR_ERR(sys_clk));
+ return;
+ }
+
+ fast_clk = of_clk_get_by_name(node, "fast");
+ if (IS_ERR(fast_clk)) {
+ pr_err("clock get failed (%lu)\n", PTR_ERR(fast_clk));
+ return;
+ }
+
+ ret = clk_prepare_enable(sys_clk);
+ if (ret < 0) {
+ pr_err("failed to enable clock (%d)\n", ret);
+ return;
+ }
+
+ ret = clk_prepare_enable(fast_clk);
+ if (ret < 0) {
+ pr_err("failed to enable clock (%d)\n", ret);
+ clk_disable_unprepare(sys_clk);
+ return;
+ }
+
+ rate = clk_get_rate(fast_clk);
+
+ /* Disable irq's for clocksource usage */
+ gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 0);
+ gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 1);
+ gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 2);
+ gpt_writel(&pcs_gpt.base, 0, TIMER_IRQ_MASK, 3);
+
+ /* Enable timer block */
+ writel(TIMER_ME_GLOBAL, pcs_gpt.base);
+
+ raw_spin_lock_init(&pcs_gpt.lock);
+ sched_clock_register(pistachio_read_sched_clock, 32, rate);
+ clocksource_register_hz(&pcs_gpt.cs, rate);
+}
+CLOCKSOURCE_OF_DECLARE(pistachio_gptimer, "img,pistachio-gptimer",
+ pistachio_clksrc_of_init);