* [PATCH v7 05/24] clocksource: Add a new timer-ingenic driver
2018-08-21 17:16 [PATCH v7 00/24] TCU patchset v7 Paul Cercueil
@ 2018-08-21 17:16 ` Paul Cercueil
2018-08-28 17:23 ` Paul Burton
2018-09-24 3:12 ` Daniel Lezcano
0 siblings, 2 replies; 10+ messages in thread
From: Paul Cercueil @ 2018-08-21 17:16 UTC (permalink / raw)
To: Thomas Gleixner, Daniel Lezcano, Rob Herring, Thierry Reding,
Mark Rutland, Ralf Baechle, Paul Burton, Jonathan Corbet
Cc: od, Mathieu Malaterre, linux-pwm, devicetree, linux-kernel,
linux-watchdog, linux-mips, linux-doc, linux-clk, Paul Cercueil
This driver handles the TCU (Timer Counter Unit) present on the Ingenic
JZ47xx SoCs, and provides the kernel with a system timer, and optionally
with a clocksource and a sched_clock.
It also provides clocks and interrupt handling to client drivers.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
Notes:
v2: Use SPDX identifier for the license
v3: - Move documentation to its own patch
- Search the devicetree for PWM clients, and use all the TCU
channels that won't be used for PWM
v4: - Add documentation about why we search for PWM clients
- Verify that the PWM clients are for the TCU PWM driver
v5: Major overhaul. Too many changes to list. Consider it's a new
patch.
v6: - Add two API functions ingenic_tcu_request_channel and
ingenic_tcu_release_channel. To be used by the PWM driver to
request the use of a TCU channel. The driver will now dynamically
move away the system timer or clocksource to a new TCU channel.
- The system timer now defaults to channel 0, the clocksource now
defaults to channel 1 and is no more optional. The
ingenic,timer-channel and ingenic,clocksource-channel devicetree
properties are now gone.
- Fix round_rate / set_rate not calculating the prescale divider
the same way. This caused problems when (parent_rate / div) would
give a non-integer result. The behaviour is correct now.
- The clocksource clock is turned off on suspend now.
v7: Fix section mismatch by using builtin_platform_driver_probe()
drivers/clocksource/Kconfig | 10 +
drivers/clocksource/Makefile | 1 +
drivers/clocksource/ingenic-timer.c | 1124 +++++++++++++++++++++++++++++++++++
drivers/clocksource/ingenic-timer.h | 15 +
include/linux/mfd/ingenic-tcu.h | 3 +
5 files changed, 1153 insertions(+)
create mode 100644 drivers/clocksource/ingenic-timer.c
create mode 100644 drivers/clocksource/ingenic-timer.h
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index dec0dd88ec15..98f708208a8d 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -609,4 +609,14 @@ config ATCPIT100_TIMER
help
This option enables support for the Andestech ATCPIT100 timers.
+config INGENIC_TIMER
+ bool "Clocksource/timer using the TCU in Ingenic JZ SoCs"
+ depends on MIPS || COMPILE_TEST
+ depends on COMMON_CLK
+ select TIMER_OF
+ select IRQ_DOMAIN
+ select REGMAP
+ help
+ Support for the timer/counter unit of the Ingenic JZ SoCs.
+
endmenu
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 00caf37e52f9..26877505d400 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -75,6 +75,7 @@ obj-$(CONFIG_ASM9260_TIMER) += asm9260_timer.o
obj-$(CONFIG_H8300_TMR8) += h8300_timer8.o
obj-$(CONFIG_H8300_TMR16) += h8300_timer16.o
obj-$(CONFIG_H8300_TPU) += h8300_tpu.o
+obj-$(CONFIG_INGENIC_TIMER) += ingenic-timer.o
obj-$(CONFIG_CLKSRC_ST_LPC) += clksrc_st_lpc.o
obj-$(CONFIG_X86_NUMACHIP) += numachip.o
obj-$(CONFIG_ATCPIT100_TIMER) += timer-atcpit100.o
diff --git a/drivers/clocksource/ingenic-timer.c b/drivers/clocksource/ingenic-timer.c
new file mode 100644
index 000000000000..c7f529997138
--- /dev/null
+++ b/drivers/clocksource/ingenic-timer.c
@@ -0,0 +1,1124 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * JZ47xx SoCs TCU IRQ driver
+ * Copyright (C) 2018 Paul Cercueil <paul@crapouillou.net>
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/mfd/ingenic-tcu.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/sched_clock.h>
+
+#include <dt-bindings/clock/ingenic,tcu.h>
+
+#include "ingenic-timer.h"
+
+/* 8 channels max + watchdog + OST */
+#define TCU_CLK_COUNT 10
+
+enum tcu_clk_parent {
+ TCU_PARENT_PCLK,
+ TCU_PARENT_RTC,
+ TCU_PARENT_EXT,
+};
+
+struct ingenic_soc_info {
+ unsigned char num_channels;
+ bool has_ost;
+};
+
+struct ingenic_tcu_clk_info {
+ struct clk_init_data init_data;
+ u8 gate_bit;
+ u8 tcsr_reg;
+};
+
+struct ingenic_tcu_clk {
+ struct clk_hw hw;
+
+ struct regmap *map;
+ const struct ingenic_tcu_clk_info *info;
+
+ unsigned int idx;
+};
+
+#define to_tcu_clk(_hw) container_of(_hw, struct ingenic_tcu_clk, hw)
+
+struct ingenic_tcu {
+ const struct ingenic_soc_info *soc_info;
+ struct regmap *map;
+ struct clk *clk, *timer_clk, *clocksource_clk;
+
+ unsigned long requested_channels;
+ struct mutex channel_request_mutex;
+
+ bool update_timer_channel;
+ unsigned int new_timer_channel;
+ struct completion new_timer_switch_job;
+ int timer_virq;
+
+ struct irq_domain *domain;
+ unsigned int nb_parent_irqs;
+ u32 parent_irqs[3];
+
+ struct clk_hw_onecell_data *clocks;
+
+ unsigned int timer_channel, clocksource_channel;
+ struct clock_event_device cevt;
+ struct clocksource cs;
+ char name[4];
+};
+
+static struct ingenic_tcu *ingenic_tcu;
+
+void __iomem *ingenic_tcu_base;
+EXPORT_SYMBOL_GPL(ingenic_tcu_base);
+
+static int ingenic_tcu_enable(struct clk_hw *hw)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+
+ regmap_write(tcu_clk->map, TCU_REG_TSCR, BIT(info->gate_bit));
+ return 0;
+}
+
+static void ingenic_tcu_disable(struct clk_hw *hw)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+
+ regmap_write(tcu_clk->map, TCU_REG_TSSR, BIT(info->gate_bit));
+}
+
+static int ingenic_tcu_is_enabled(struct clk_hw *hw)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ unsigned int value;
+
+ regmap_read(tcu_clk->map, TCU_REG_TSR, &value);
+
+ return !(value & BIT(info->gate_bit));
+}
+
+static u8 ingenic_tcu_get_parent(struct clk_hw *hw)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ unsigned int val = 0;
+ int ret;
+
+ ret = regmap_read(tcu_clk->map, info->tcsr_reg, &val);
+ WARN_ONCE(ret < 0, "Unable to read TCSR %i", tcu_clk->idx);
+
+ return ffs(val & TCU_TCSR_PARENT_CLOCK_MASK) - 1;
+}
+
+static int ingenic_tcu_set_parent(struct clk_hw *hw, u8 idx)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ struct regmap *map = tcu_clk->map;
+ int ret;
+
+ /*
+ * Our clock provider has the CLK_SET_PARENT_GATE flag set, so we know
+ * that the clk is in unprepared state. To be able to access TCSR
+ * we must ungate the clock supply and we gate it again when done.
+ */
+
+ regmap_write(map, TCU_REG_TSCR, BIT(info->gate_bit));
+
+ ret = regmap_update_bits(map, info->tcsr_reg,
+ TCU_TCSR_PARENT_CLOCK_MASK, BIT(idx));
+ WARN_ONCE(ret < 0, "Unable to update TCSR %i", tcu_clk->idx);
+
+ regmap_write(map, TCU_REG_TSSR, BIT(info->gate_bit));
+
+ return 0;
+}
+
+static unsigned long ingenic_tcu_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ unsigned int prescale;
+ int ret;
+
+ ret = regmap_read(tcu_clk->map, info->tcsr_reg, &prescale);
+ WARN_ONCE(ret < 0, "Unable to read TCSR %i", tcu_clk->idx);
+
+ prescale = (prescale & TCU_TCSR_PRESCALE_MASK) >> TCU_TCSR_PRESCALE_LSB;
+
+ return parent_rate >> (prescale * 2);
+}
+
+static u8 ingenic_tcu_get_prescale(unsigned long rate, unsigned long req_rate)
+{
+ u8 prescale;
+
+ for (prescale = 0; prescale < 5; prescale++)
+ if ((rate >> (prescale * 2)) <= req_rate)
+ return prescale;
+
+ return 5; /* /1024 divider */
+}
+
+static long ingenic_tcu_round_rate(struct clk_hw *hw, unsigned long req_rate,
+ unsigned long *parent_rate)
+{
+ unsigned long rate = *parent_rate;
+ u8 prescale;
+
+ if (req_rate > rate)
+ return -EINVAL;
+
+ prescale = ingenic_tcu_get_prescale(rate, req_rate);
+ return rate >> (prescale * 2);
+}
+
+static int ingenic_tcu_set_rate(struct clk_hw *hw, unsigned long req_rate,
+ unsigned long parent_rate)
+{
+ struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+ const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+ struct regmap *map = tcu_clk->map;
+ u8 prescale = ingenic_tcu_get_prescale(parent_rate, req_rate);
+ int ret;
+
+ /*
+ * Our clock provider has the CLK_SET_RATE_GATE flag set, so we know
+ * that the clk is in unprepared state. To be able to access TCSR
+ * we must ungate the clock supply and we gate it again when done.
+ */
+
+ regmap_write(map, TCU_REG_TSCR, BIT(info->gate_bit));
+
+ ret = regmap_update_bits(map, info->tcsr_reg,
+ TCU_TCSR_PRESCALE_MASK,
+ prescale << TCU_TCSR_PRESCALE_LSB);
+ WARN_ONCE(ret < 0, "Unable to update TCSR %i", tcu_clk->idx);
+
+ regmap_write(map, TCU_REG_TSSR, BIT(info->gate_bit));
+
+ return 0;
+}
+
+static const struct clk_ops ingenic_tcu_clk_ops = {
+ .get_parent = ingenic_tcu_get_parent,
+ .set_parent = ingenic_tcu_set_parent,
+
+ .recalc_rate = ingenic_tcu_recalc_rate,
+ .round_rate = ingenic_tcu_round_rate,
+ .set_rate = ingenic_tcu_set_rate,
+
+ .enable = ingenic_tcu_enable,
+ .disable = ingenic_tcu_disable,
+ .is_enabled = ingenic_tcu_is_enabled,
+};
+
+static const char * const ingenic_tcu_timer_parents[] = {
+ [TCU_PARENT_PCLK] = "pclk",
+ [TCU_PARENT_RTC] = "rtc",
+ [TCU_PARENT_EXT] = "ext",
+};
+
+#define DEF_TIMER(_name, _gate_bit, _tcsr) \
+ { \
+ .init_data = { \
+ .name = _name, \
+ .parent_names = ingenic_tcu_timer_parents, \
+ .num_parents = ARRAY_SIZE(ingenic_tcu_timer_parents),\
+ .ops = &ingenic_tcu_clk_ops, \
+ .flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE,\
+ }, \
+ .gate_bit = _gate_bit, \
+ .tcsr_reg = _tcsr, \
+ }
+static const struct ingenic_tcu_clk_info ingenic_tcu_clk_info[] = {
+ [TCU_CLK_TIMER0] = DEF_TIMER("timer0", 0, TCU_REG_TCSRc(0)),
+ [TCU_CLK_TIMER1] = DEF_TIMER("timer1", 1, TCU_REG_TCSRc(1)),
+ [TCU_CLK_TIMER2] = DEF_TIMER("timer2", 2, TCU_REG_TCSRc(2)),
+ [TCU_CLK_TIMER3] = DEF_TIMER("timer3", 3, TCU_REG_TCSRc(3)),
+ [TCU_CLK_TIMER4] = DEF_TIMER("timer4", 4, TCU_REG_TCSRc(4)),
+ [TCU_CLK_TIMER5] = DEF_TIMER("timer5", 5, TCU_REG_TCSRc(5)),
+ [TCU_CLK_TIMER6] = DEF_TIMER("timer6", 6, TCU_REG_TCSRc(6)),
+ [TCU_CLK_TIMER7] = DEF_TIMER("timer7", 7, TCU_REG_TCSRc(7)),
+};
+
+static const struct ingenic_tcu_clk_info ingenic_tcu_watchdog_clk_info =
+ DEF_TIMER("wdt", 16, TCU_REG_WDT_TCSR);
+static const struct ingenic_tcu_clk_info ingenic_tcu_ost_clk_info =
+ DEF_TIMER("ost", 15, TCU_REG_OST_TCSR);
+#undef DEF_TIMER
+
+static void ingenic_tcu_intc_cascade(struct irq_desc *desc)
+{
+ struct irq_chip *irq_chip = irq_data_get_irq_chip(&desc->irq_data);
+ struct irq_domain *domain = irq_desc_get_handler_data(desc);
+ struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0);
+ struct regmap *map = gc->private;
+ uint32_t irq_reg, irq_mask;
+ unsigned int i;
+
+ regmap_read(map, TCU_REG_TFR, &irq_reg);
+ regmap_read(map, TCU_REG_TMR, &irq_mask);
+
+ chained_irq_enter(irq_chip, desc);
+
+ irq_reg &= ~irq_mask;
+
+ for_each_set_bit(i, (unsigned long *)&irq_reg, 32)
+ generic_handle_irq(irq_linear_revmap(domain, i));
+
+ chained_irq_exit(irq_chip, desc);
+}
+
+static void ingenic_tcu_gc_unmask_enable_reg(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+ struct regmap *map = gc->private;
+ u32 mask = d->mask;
+
+ irq_gc_lock(gc);
+ regmap_write(map, ct->regs.ack, mask);
+ regmap_write(map, ct->regs.enable, mask);
+ *ct->mask_cache |= mask;
+ irq_gc_unlock(gc);
+}
+
+static void ingenic_tcu_gc_mask_disable_reg(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+ struct regmap *map = gc->private;
+ u32 mask = d->mask;
+
+ irq_gc_lock(gc);
+ regmap_write(map, ct->regs.disable, mask);
+ *ct->mask_cache &= ~mask;
+ irq_gc_unlock(gc);
+}
+
+static void ingenic_tcu_gc_mask_disable_reg_and_ack(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+ struct regmap *map = gc->private;
+ u32 mask = d->mask;
+
+ irq_gc_lock(gc);
+ regmap_write(map, ct->regs.ack, mask);
+ regmap_write(map, ct->regs.disable, mask);
+ irq_gc_unlock(gc);
+}
+
+static u64 notrace ingenic_tcu_timer_read(void)
+{
+ unsigned int channel = ingenic_tcu->clocksource_channel;
+ u16 count;
+
+ count = readw(ingenic_tcu_base + TCU_REG_TCNTc(channel));
+
+ return count;
+}
+
+static inline struct ingenic_tcu *to_ingenic_tcu(struct clock_event_device *evt)
+{
+ return container_of(evt, struct ingenic_tcu, cevt);
+}
+
+static int ingenic_tcu_cevt_set_state_shutdown(struct clock_event_device *evt)
+{
+ struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
+
+ regmap_write(tcu->map, TCU_REG_TECR, BIT(tcu->timer_channel));
+ return 0;
+}
+
+static int ingenic_tcu_cevt_set_next(unsigned long next,
+ struct clock_event_device *evt)
+{
+ struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
+
+ if (next > 0xffff)
+ return -EINVAL;
+
+ if (unlikely(tcu->update_timer_channel)) {
+ tcu->update_timer_channel = false;
+ ingenic_tcu_cevt_set_state_shutdown(evt);
+
+ tcu->timer_channel = tcu->new_timer_channel;
+ complete(&tcu->new_timer_switch_job);
+ }
+
+ regmap_write(tcu->map, TCU_REG_TDFRc(tcu->timer_channel), next);
+ regmap_write(tcu->map, TCU_REG_TCNTc(tcu->timer_channel), 0);
+ regmap_write(tcu->map, TCU_REG_TESR, BIT(tcu->timer_channel));
+
+ return 0;
+}
+
+static irqreturn_t ingenic_tcu_cevt_cb(int irq, void *dev_id)
+{
+ struct clock_event_device *evt = dev_id;
+ struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
+
+ regmap_write(tcu->map, TCU_REG_TECR, BIT(tcu->timer_channel));
+
+ if (evt->event_handler)
+ evt->event_handler(evt);
+
+ return IRQ_HANDLED;
+}
+
+static int __init ingenic_tcu_register_clock(struct ingenic_tcu *tcu,
+ unsigned int idx, enum tcu_clk_parent parent,
+ const struct ingenic_tcu_clk_info *info,
+ struct clk_hw_onecell_data *clocks)
+{
+ struct ingenic_tcu_clk *tcu_clk;
+ int err;
+
+ tcu_clk = kzalloc(sizeof(*tcu_clk), GFP_KERNEL);
+ if (!tcu_clk)
+ return -ENOMEM;
+
+ tcu_clk->hw.init = &info->init_data;
+ tcu_clk->idx = idx;
+ tcu_clk->info = info;
+ tcu_clk->map = tcu->map;
+
+ /* Reset channel and clock divider, set default parent */
+ ingenic_tcu_enable(&tcu_clk->hw);
+ regmap_update_bits(tcu->map, info->tcsr_reg, 0xffff, BIT(parent));
+ ingenic_tcu_disable(&tcu_clk->hw);
+
+ err = clk_hw_register(NULL, &tcu_clk->hw);
+ if (err)
+ goto err_free_tcu_clk;
+
+ err = clk_hw_register_clkdev(&tcu_clk->hw, info->init_data.name, NULL);
+ if (err)
+ goto err_clk_unregister;
+
+ clocks->hws[idx] = &tcu_clk->hw;
+ return 0;
+
+err_clk_unregister:
+ clk_hw_unregister(&tcu_clk->hw);
+err_free_tcu_clk:
+ kfree(tcu_clk);
+ return err;
+}
+
+static int __init ingenic_tcu_clk_init(struct ingenic_tcu *tcu,
+ struct device_node *np)
+{
+ size_t i;
+ int ret;
+
+ tcu->clocks = kzalloc(sizeof(*tcu->clocks) +
+ sizeof(*tcu->clocks->hws) * TCU_CLK_COUNT,
+ GFP_KERNEL);
+ if (!tcu->clocks)
+ return -ENOMEM;
+
+ tcu->clocks->num = TCU_CLK_COUNT;
+
+ for (i = 0; i < tcu->soc_info->num_channels; i++) {
+ ret = ingenic_tcu_register_clock(tcu, i, TCU_PARENT_EXT,
+ &ingenic_tcu_clk_info[i], tcu->clocks);
+ if (ret) {
+ pr_err("ingenic-timer: cannot register clock %i\n", i);
+ goto err_unregister_timer_clocks;
+ }
+ }
+
+ /*
+ * We set EXT as the default parent clock for all the TCU clocks
+ * except for the watchdog one, where we set the RTC clock as the
+ * parent. Since the EXT and PCLK are much faster than the RTC clock,
+ * the watchdog would kick after a maximum time of 5s, and we might
+ * want a slower kicking time.
+ */
+ ret = ingenic_tcu_register_clock(tcu, TCU_CLK_WDT, TCU_PARENT_RTC,
+ &ingenic_tcu_watchdog_clk_info, tcu->clocks);
+ if (ret) {
+ pr_err("ingenic-timer: cannot register watchdog clock\n");
+ goto err_unregister_timer_clocks;
+ }
+
+ if (tcu->soc_info->has_ost) {
+ ret = ingenic_tcu_register_clock(tcu, TCU_CLK_OST,
+ TCU_PARENT_EXT,
+ &ingenic_tcu_ost_clk_info,
+ tcu->clocks);
+ if (ret) {
+ pr_err("ingenic-timer: cannot register ost clock\n");
+ goto err_unregister_watchdog_clock;
+ }
+ }
+
+ ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, tcu->clocks);
+ if (ret) {
+ pr_err("ingenic-timer: cannot add OF clock provider\n");
+ goto err_unregister_ost_clock;
+ }
+
+ return 0;
+
+err_unregister_ost_clock:
+ if (tcu->soc_info->has_ost)
+ clk_hw_unregister(tcu->clocks->hws[i + 1]);
+err_unregister_watchdog_clock:
+ clk_hw_unregister(tcu->clocks->hws[i]);
+err_unregister_timer_clocks:
+ for (i = 0; i < tcu->clocks->num; i++)
+ if (tcu->clocks->hws[i])
+ clk_hw_unregister(tcu->clocks->hws[i]);
+ kfree(tcu->clocks);
+ return ret;
+}
+
+static void __init ingenic_tcu_clk_cleanup(struct ingenic_tcu *tcu,
+ struct device_node *np)
+{
+ unsigned int i;
+
+ of_clk_del_provider(np);
+
+ for (i = 0; i < tcu->clocks->num; i++)
+ clk_hw_unregister(tcu->clocks->hws[i]);
+ kfree(tcu->clocks);
+}
+
+static int __init ingenic_tcu_intc_init(struct ingenic_tcu *tcu,
+ struct device_node *np)
+{
+ struct irq_chip_generic *gc;
+ struct irq_chip_type *ct;
+ int err, i, irqs;
+
+ irqs = of_property_count_elems_of_size(np, "interrupts", sizeof(u32));
+ if (irqs < 0 || irqs > ARRAY_SIZE(tcu->parent_irqs))
+ return -EINVAL;
+
+ tcu->nb_parent_irqs = irqs;
+
+ tcu->domain = irq_domain_add_linear(np, 32,
+ &irq_generic_chip_ops, NULL);
+ if (!tcu->domain)
+ return -ENOMEM;
+
+ err = irq_alloc_domain_generic_chips(tcu->domain, 32, 1, "TCU",
+ handle_level_irq, 0, IRQ_NOPROBE | IRQ_LEVEL, 0);
+ if (err)
+ goto out_domain_remove;
+
+ gc = irq_get_domain_generic_chip(tcu->domain, 0);
+ ct = gc->chip_types;
+
+ gc->wake_enabled = IRQ_MSK(32);
+ gc->private = tcu->map;
+
+ ct->regs.disable = TCU_REG_TMSR;
+ ct->regs.enable = TCU_REG_TMCR;
+ ct->regs.ack = TCU_REG_TFCR;
+ ct->chip.irq_unmask = ingenic_tcu_gc_unmask_enable_reg;
+ ct->chip.irq_mask = ingenic_tcu_gc_mask_disable_reg;
+ ct->chip.irq_mask_ack = ingenic_tcu_gc_mask_disable_reg_and_ack;
+ ct->chip.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE;
+
+ /* Mask all IRQs by default */
+ regmap_write(tcu->map, TCU_REG_TMSR, IRQ_MSK(32));
+
+ /* On JZ4740, timer 0 and timer 1 have their own interrupt line;
+ * timers 2-7 share one interrupt.
+ * On SoCs >= JZ4770, timer 5 has its own interrupt line;
+ * timers 0-4 and 6-7 share one single interrupt.
+ *
+ * To keep things simple, we just register the same handler to
+ * all parent interrupts. The handler will properly detect which
+ * channel fired the interrupt.
+ */
+ for (i = 0; i < irqs; i++) {
+ tcu->parent_irqs[i] = irq_of_parse_and_map(np, i);
+ if (!tcu->parent_irqs[i]) {
+ err = -EINVAL;
+ goto out_unmap_irqs;
+ }
+
+ irq_set_chained_handler_and_data(tcu->parent_irqs[i],
+ ingenic_tcu_intc_cascade, tcu->domain);
+ }
+
+ return 0;
+
+out_unmap_irqs:
+ for (; i > 0; i--)
+ irq_dispose_mapping(tcu->parent_irqs[i - 1]);
+out_domain_remove:
+ irq_domain_remove(tcu->domain);
+ return err;
+}
+
+static void __init ingenic_tcu_intc_cleanup(struct ingenic_tcu *tcu)
+{
+ unsigned int i;
+
+ for (i = 0; i < tcu->nb_parent_irqs; i++)
+ irq_dispose_mapping(tcu->parent_irqs[i]);
+
+ irq_domain_remove(tcu->domain);
+}
+
+static int __init ingenic_tcu_timer_init(struct ingenic_tcu *tcu)
+{
+ unsigned long rate;
+ int err;
+
+ tcu->timer_clk = tcu->clocks->hws[tcu->timer_channel]->clk;
+
+ err = clk_prepare_enable(tcu->timer_clk);
+ if (err)
+ return err;
+
+ rate = clk_get_rate(tcu->timer_clk);
+ if (!rate) {
+ err = -EINVAL;
+ goto err_clk_disable;
+ }
+
+ tcu->timer_virq = irq_create_mapping(tcu->domain, tcu->timer_channel);
+ if (!tcu->timer_virq) {
+ err = -EINVAL;
+ goto err_clk_disable;
+ }
+
+ snprintf(tcu->name, sizeof(tcu->name), "TCU");
+
+ err = request_irq(tcu->timer_virq, ingenic_tcu_cevt_cb, IRQF_TIMER,
+ tcu->name, &tcu->cevt);
+ if (err)
+ goto err_irq_dispose_mapping;
+
+ tcu->cevt.cpumask = cpumask_of(smp_processor_id());
+ tcu->cevt.features = CLOCK_EVT_FEAT_ONESHOT;
+ tcu->cevt.name = tcu->name;
+ tcu->cevt.rating = 200;
+ tcu->cevt.set_state_shutdown = ingenic_tcu_cevt_set_state_shutdown;
+ tcu->cevt.set_next_event = ingenic_tcu_cevt_set_next;
+
+ clockevents_config_and_register(&tcu->cevt, rate, 10, 0xffff);
+
+ return 0;
+
+err_irq_dispose_mapping:
+ irq_dispose_mapping(tcu->timer_virq);
+err_clk_disable:
+ clk_disable_unprepare(tcu->timer_clk);
+ return err;
+}
+
+static int __init ingenic_tcu_clocksource_init(struct ingenic_tcu *tcu)
+{
+ unsigned int channel = tcu->clocksource_channel;
+ struct clocksource *cs = &tcu->cs;
+ unsigned long rate;
+ int err;
+
+ tcu->clocksource_clk = tcu->clocks->hws[channel]->clk;
+
+ err = clk_prepare_enable(tcu->clocksource_clk);
+ if (err)
+ return err;
+
+ rate = clk_get_rate(tcu->clocksource_clk);
+ if (!rate) {
+ err = -EINVAL;
+ goto err_clk_disable;
+ }
+
+ /* Reset channel */
+ regmap_update_bits(tcu->map, TCU_REG_TCSRc(channel),
+ 0xffff & ~TCU_TCSR_RESERVED_BITS, 0);
+
+ /* Reset counter */
+ regmap_write(tcu->map, TCU_REG_TDFRc(channel), 0xffff);
+ regmap_write(tcu->map, TCU_REG_TCNTc(channel), 0);
+
+ /* Enable channel */
+ regmap_write(tcu->map, TCU_REG_TESR, BIT(channel));
+
+ cs->name = "ingenic-timer";
+ cs->rating = 200;
+ cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
+ cs->mask = CLOCKSOURCE_MASK(16);
+ cs->read = (u64 (*)(struct clocksource *))ingenic_tcu_timer_read;
+
+ err = clocksource_register_hz(cs, rate);
+ if (err)
+ goto err_clk_disable;
+
+ sched_clock_register(ingenic_tcu_timer_read, 16, rate);
+
+ return 0;
+
+err_clk_disable:
+ clk_disable_unprepare(tcu->clocksource_clk);
+ return err;
+}
+
+static void __init ingenic_tcu_clocksource_cleanup(struct ingenic_tcu *tcu)
+{
+ clocksource_unregister(&tcu->cs);
+ clk_disable_unprepare(tcu->clocksource_clk);
+}
+
+static const struct regmap_config ingenic_tcu_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+};
+
+static const struct ingenic_soc_info jz4740_soc_info = {
+ .num_channels = 8,
+ .has_ost = false,
+};
+
+static const struct ingenic_soc_info jz4725b_soc_info = {
+ .num_channels = 6,
+ .has_ost = true,
+};
+
+static const struct ingenic_soc_info jz4770_soc_info = {
+ .num_channels = 8,
+ .has_ost = true,
+};
+
+static const struct of_device_id ingenic_tcu_of_match[] = {
+ { .compatible = "ingenic,jz4740-tcu", .data = &jz4740_soc_info, },
+ { .compatible = "ingenic,jz4725b-tcu", .data = &jz4725b_soc_info, },
+ { .compatible = "ingenic,jz4770-tcu", .data = &jz4770_soc_info, },
+ { }
+};
+
+static int __init ingenic_tcu_init(struct device_node *np)
+{
+ const struct of_device_id *id = of_match_node(ingenic_tcu_of_match, np);
+ struct ingenic_tcu *tcu;
+ struct resource res;
+ void __iomem *base;
+ int ret;
+
+ of_node_clear_flag(np, OF_POPULATED);
+
+ tcu = kzalloc(sizeof(*tcu), GFP_KERNEL);
+ if (!tcu)
+ return -ENOMEM;
+
+ init_completion(&tcu->new_timer_switch_job);
+ mutex_init(&tcu->channel_request_mutex);
+
+ tcu->soc_info = (const struct ingenic_soc_info *)id->data;
+ ingenic_tcu = tcu;
+
+ base = of_io_request_and_map(np, 0, NULL);
+ if (IS_ERR(base)) {
+ ret = PTR_ERR(base);
+ goto err_free_ingenic_tcu;
+ }
+
+ ingenic_tcu_base = base;
+
+ tcu->map = regmap_init_mmio(NULL, base, &ingenic_tcu_regmap_config);
+ if (IS_ERR(tcu->map)) {
+ ret = PTR_ERR(tcu->map);
+ goto err_iounmap;
+ }
+
+ tcu->clk = of_clk_get_by_name(np, "tcu");
+ if (IS_ERR(tcu->clk)) {
+ ret = PTR_ERR(tcu->clk);
+ pr_crit("ingenic-tcu: Unable to find TCU clock: %i\n", ret);
+ goto err_free_regmap;
+ }
+
+ ret = clk_prepare_enable(tcu->clk);
+ if (ret) {
+ pr_crit("ingenic-tcu: Unable to enable TCU clock: %i\n", ret);
+ goto err_clk_put;
+ }
+
+ ret = ingenic_tcu_intc_init(tcu, np);
+ if (ret)
+ goto err_clk_disable;
+
+ ret = ingenic_tcu_clk_init(tcu, np);
+ if (ret)
+ goto err_tcu_intc_cleanup;
+
+ tcu->timer_channel = 0;
+ tcu->clocksource_channel = 1;
+ tcu->requested_channels = BIT(tcu->timer_channel)
+ | BIT(tcu->clocksource_channel);
+
+ ret = ingenic_tcu_clocksource_init(tcu);
+ if (ret)
+ goto err_tcu_clk_cleanup;
+
+ ret = ingenic_tcu_timer_init(tcu);
+ if (ret)
+ goto err_tcu_clocksource_cleanup;
+
+ return 0;
+
+err_tcu_clocksource_cleanup:
+ ingenic_tcu_clocksource_cleanup(tcu);
+err_tcu_clk_cleanup:
+ ingenic_tcu_clk_cleanup(tcu, np);
+err_tcu_intc_cleanup:
+ ingenic_tcu_intc_cleanup(tcu);
+err_clk_disable:
+ clk_disable_unprepare(tcu->clk);
+err_clk_put:
+ clk_put(tcu->clk);
+err_free_regmap:
+ regmap_exit(tcu->map);
+err_iounmap:
+ iounmap(base);
+ of_address_to_resource(np, 0, &res);
+ release_mem_region(res.start, resource_size(&res));
+err_free_ingenic_tcu:
+ kfree(tcu);
+ return ret;
+}
+
+TIMER_OF_DECLARE(jz4740_tcu_intc, "ingenic,jz4740-tcu", ingenic_tcu_init);
+TIMER_OF_DECLARE(jz4725b_tcu_intc, "ingenic,jz4725b-tcu", ingenic_tcu_init);
+TIMER_OF_DECLARE(jz4770_tcu_intc, "ingenic,jz4770-tcu", ingenic_tcu_init);
+
+
+static int __init ingenic_tcu_probe(struct platform_device *pdev)
+{
+ platform_set_drvdata(pdev, ingenic_tcu);
+
+ regmap_attach_dev(&pdev->dev, ingenic_tcu->map,
+ &ingenic_tcu_regmap_config);
+
+ return devm_of_platform_populate(&pdev->dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ingenic_tcu_suspend_lock(struct device *dev)
+{
+ struct ingenic_tcu *tcu = dev_get_drvdata(dev);
+
+ /*
+ * We lock the channel_request_mutex when suspending and unlock it when
+ * resuming. This is done so because at some point in the channel switch
+ * algorithm we have the old and new clocks enabled at the same time.
+ */
+ mutex_lock(&tcu->channel_request_mutex);
+
+ return 0;
+}
+
+static int ingenic_tcu_resume_unlock(struct device *dev)
+{
+ struct ingenic_tcu *tcu = dev_get_drvdata(dev);
+
+ mutex_unlock(&tcu->channel_request_mutex);
+
+ return 0;
+}
+
+static int ingenic_tcu_suspend(struct device *dev)
+{
+ struct ingenic_tcu *tcu = dev_get_drvdata(dev);
+
+ clk_disable(tcu->clocksource_clk);
+ clk_disable(tcu->timer_clk);
+ clk_disable(tcu->clk);
+ return 0;
+}
+
+static int ingenic_tcu_resume(struct device *dev)
+{
+ struct ingenic_tcu *tcu = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_enable(tcu->clk);
+ if (ret)
+ return ret;
+
+ ret = clk_enable(tcu->timer_clk);
+ if (ret)
+ goto err_tcu_clk_disable;
+
+ ret = clk_enable(tcu->clocksource_clk);
+ if (ret)
+ goto err_tcu_timer_clk_disable;
+
+ return 0;
+
+err_tcu_timer_clk_disable:
+ clk_disable(tcu->timer_clk);
+err_tcu_clk_disable:
+ clk_disable(tcu->clk);
+ return ret;
+}
+
+static const struct dev_pm_ops ingenic_tcu_pm_ops = {
+ /* We must not start a channel switch when suspending */
+ .suspend = ingenic_tcu_suspend_lock,
+ .resume = ingenic_tcu_resume_unlock,
+
+ /* _noirq: We want the TCU clock to be gated last / ungated first */
+ .suspend_noirq = ingenic_tcu_suspend,
+ .resume_noirq = ingenic_tcu_resume,
+};
+#define INGENIC_TCU_PM_OPS (&ingenic_tcu_pm_ops)
+
+#else
+#define INGENIC_TCU_PM_OPS NULL
+#endif /* CONFIG_PM_SUSPEND */
+
+static struct platform_driver ingenic_tcu_driver = {
+ .driver = {
+ .name = "ingenic-tcu",
+ .pm = INGENIC_TCU_PM_OPS,
+ .of_match_table = ingenic_tcu_of_match,
+ },
+};
+builtin_platform_driver_probe(ingenic_tcu_driver, ingenic_tcu_probe);
+
+static int ingenic_tcu_get_free_channel(struct ingenic_tcu *tcu)
+{
+ unsigned int i;
+
+ for (i = 0; i < tcu->soc_info->num_channels; i++) {
+ if (!(tcu->requested_channels & BIT(i))) {
+ tcu->requested_channels |= BIT(i);
+ return i;
+ }
+ }
+
+ return -EBUSY;
+}
+
+static struct clk *ingenic_tcu_dup_clk(struct ingenic_tcu *tcu, unsigned int ch)
+{
+ struct clk *old_clk = tcu->timer_clk,
+ *new_clk = tcu->clocks->hws[ch]->clk;
+ unsigned long rate;
+ int ret;
+
+ rate = clk_get_rate(old_clk);
+ if (!rate)
+ return ERR_PTR(-EINVAL);
+
+ /* The new channel must run at the same rate */
+ ret = clk_set_rate(new_clk, rate);
+ if (ret)
+ return ERR_PTR(ret);
+
+ ret = clk_prepare_enable(new_clk);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return new_clk;
+}
+
+static int ingenic_tcu_move_timer(struct ingenic_tcu *tcu)
+{
+ struct clk *new_clk, *old_clk = tcu->timer_clk;
+ int ret, virq, old_virq = tcu->timer_virq;
+ unsigned int new_channel;
+
+ ret = ingenic_tcu_get_free_channel(tcu);
+ if (ret < 0)
+ return ret;
+
+ new_channel = ret;
+
+ new_clk = ingenic_tcu_dup_clk(tcu, new_channel);
+ if (IS_ERR(new_clk)) {
+ ret = PTR_ERR(new_clk);
+ goto err_free_channel;
+ }
+
+ /* Disable the timer so that it doesn't count up */
+ regmap_write(tcu->map, TCU_REG_TECR, BIT(new_channel));
+
+ virq = irq_create_mapping(tcu->domain, new_channel);
+ if (!virq) {
+ ret = -EINVAL;
+ goto err_clk_disable;
+ }
+
+ ret = request_irq(virq, ingenic_tcu_cevt_cb, IRQF_TIMER,
+ tcu->name, &tcu->cevt);
+ if (ret)
+ goto err_irq_dispose_mapping;
+
+ tcu->timer_clk = new_clk;
+
+ /* Do the switch now */
+ reinit_completion(&tcu->new_timer_switch_job);
+ tcu->timer_virq = virq;
+ tcu->new_timer_channel = new_channel;
+ tcu->update_timer_channel = true;
+ wait_for_completion(&tcu->new_timer_switch_job);
+
+ /* The switch is done, it's safe to release the old timer channel now */
+ free_irq(old_virq, &tcu->cevt);
+ irq_dispose_mapping(old_virq);
+ clk_disable_unprepare(old_clk);
+
+ pr_info("ingenic-timer: Switched system timer to TCU channel %u\n",
+ new_channel);
+ return 0;
+
+err_irq_dispose_mapping:
+ irq_dispose_mapping(virq);
+err_clk_disable:
+ clk_disable_unprepare(new_clk);
+err_free_channel:
+ tcu->requested_channels &= ~BIT(new_channel);
+ return ret;
+}
+
+static int ingenic_tcu_move_clocksource(struct ingenic_tcu *tcu)
+{
+ struct clk *new_clk, *old_clk = tcu->clocksource_clk;
+ unsigned int new_channel, old_channel = tcu->clocksource_channel;
+ unsigned long flags;
+ u16 tcnt;
+ int ret;
+
+ ret = ingenic_tcu_get_free_channel(tcu);
+ if (ret < 0)
+ return ret;
+
+ new_channel = ret;
+
+ new_clk = ingenic_tcu_dup_clk(tcu, new_channel);
+ if (IS_ERR(new_clk)) {
+ tcu->requested_channels &= ~BIT(new_channel);
+ return PTR_ERR(new_clk);
+ }
+
+ /* Reset counter */
+ regmap_write(tcu->map, TCU_REG_TDFRc(new_channel), 0xffff);
+
+ /*
+ * Sync the two counters. This must run as fast as possible since we
+ * disable the main timer; so we temporarily disable interrupts and
+ * bypass the regmap.
+ */
+ local_irq_save(flags);
+
+ tcu->clocksource_channel = new_channel;
+ tcu->clocksource_clk = new_clk;
+
+ writel(BIT(old_channel) | BIT(new_channel),
+ ingenic_tcu_base + TCU_REG_TECR);
+
+ tcnt = readw(ingenic_tcu_base + TCU_REG_TCNTc(old_channel));
+ writew(tcnt, ingenic_tcu_base + TCU_REG_TCNTc(new_channel));
+
+ writel(BIT(new_channel), ingenic_tcu_base + TCU_REG_TESR);
+ local_irq_restore(flags);
+
+ /* The switch is done, it's safe to release the old timer channel now */
+ regmap_write(tcu->map, TCU_REG_TECR, BIT(old_channel));
+ clk_disable_unprepare(old_clk);
+
+ pr_info("ingenic-timer: Switched clocksource to TCU channel %u\n",
+ new_channel);
+ return 0;
+}
+
+static int ingenic_tcu_request(struct ingenic_tcu *tcu, unsigned int channel)
+{
+ int ret = 0;
+
+ if (channel >= tcu->soc_info->num_channels)
+ return -EINVAL;
+
+ mutex_lock(&tcu->channel_request_mutex);
+
+ if (tcu->requested_channels & BIT(channel)) {
+ if (channel == tcu->timer_channel)
+ ret = ingenic_tcu_move_timer(tcu);
+ else if (channel == tcu->clocksource_channel)
+ ret = ingenic_tcu_move_clocksource(tcu);
+ else
+ ret = -EBUSY;
+ } else {
+ tcu->requested_channels |= BIT(channel);
+ }
+
+ mutex_unlock(&tcu->channel_request_mutex);
+
+ if (ret)
+ pr_err("ingenic-timer: Unable to move channel: %i\n", ret);
+ return ret;
+}
+
+/**
+ * ingenic_tcu_request_channel() - Request a TCU channel
+ * @channel: index of the TCU channel to request
+ *
+ * Return: 0 on success, or a negative error code on failure.
+ */
+int ingenic_tcu_request_channel(unsigned int channel)
+{
+ return ingenic_tcu_request(ingenic_tcu, channel);
+}
+EXPORT_SYMBOL_GPL(ingenic_tcu_request_channel);
+
+static int ingenic_tcu_release(struct ingenic_tcu *tcu, unsigned int channel)
+{
+ if (channel >= tcu->soc_info->num_channels)
+ return -EINVAL;
+
+ mutex_lock(&tcu->channel_request_mutex);
+
+ tcu->requested_channels &= ~BIT(channel);
+
+ mutex_unlock(&tcu->channel_request_mutex);
+ return 0;
+}
+
+/**
+ * ingenic_tcu_release_channel() - Release a TCU channel
+ * @channel: index of the TCU channel to release
+ *
+ * Return: 0 on success, or a negative error code on failure.
+ */
+int ingenic_tcu_release_channel(unsigned int channel)
+{
+ return ingenic_tcu_release(ingenic_tcu, channel);
+}
+EXPORT_SYMBOL_GPL(ingenic_tcu_release_channel);
diff --git a/drivers/clocksource/ingenic-timer.h b/drivers/clocksource/ingenic-timer.h
new file mode 100644
index 000000000000..fa43da836ab6
--- /dev/null
+++ b/drivers/clocksource/ingenic-timer.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __DRIVERS_CLOCKSOURCE_INGENIC_TIMER_H__
+#define __DRIVERS_CLOCKSOURCE_INGENIC_TIMER_H__
+
+#include <linux/compiler_types.h>
+
+/*
+ * README: For use *ONLY* by the ingenic-ost driver.
+ * Regular drivers which want to access the TCU registers
+ * must have ingenic-timer as parent and retrieve the regmap
+ * doing dev_get_regmap(pdev->dev.parent);
+ */
+extern void __iomem *ingenic_tcu_base;
+
+#endif /* __DRIVERS_CLOCKSOURCE_INGENIC_TIMER_H__ */
diff --git a/include/linux/mfd/ingenic-tcu.h b/include/linux/mfd/ingenic-tcu.h
index ab16ad283def..869ac4523a4e 100644
--- a/include/linux/mfd/ingenic-tcu.h
+++ b/include/linux/mfd/ingenic-tcu.h
@@ -53,4 +53,7 @@
#define TCU_REG_TCNTc(c) (TCU_REG_TCNT0 + ((c) * TCU_CHANNEL_STRIDE))
#define TCU_REG_TCSRc(c) (TCU_REG_TCSR0 + ((c) * TCU_CHANNEL_STRIDE))
+int ingenic_tcu_request_channel(unsigned int channel);
+int ingenic_tcu_release_channel(unsigned int channel);
+
#endif /* __LINUX_MFD_INGENIC_TCU_H_ */
--
2.11.0
^ permalink raw reply related [flat|nested] 10+ messages in thread