Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 236 insertions, 0 deletions

diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c
new file mode 100644
index 0000000000..bd64a8a842
--- /dev/null
+++ b/drivers/clocksource/timer-imx-tpm.c
@@ -0,0 +1,236 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright 2016 Freescale Semiconductor, Inc.
+// Copyright 2017 NXP
+
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/sched_clock.h>
+
+#include "timer-of.h"
+
+#define TPM_PARAM			0x4
+#define TPM_PARAM_WIDTH_SHIFT		16
+#define TPM_PARAM_WIDTH_MASK		(0xff << 16)
+#define TPM_SC				0x10
+#define TPM_SC_CMOD_INC_PER_CNT		(0x1 << 3)
+#define TPM_SC_CMOD_DIV_DEFAULT		0x3
+#define TPM_SC_CMOD_DIV_MAX		0x7
+#define TPM_SC_TOF_MASK			(0x1 << 7)
+#define TPM_CNT				0x14
+#define TPM_MOD				0x18
+#define TPM_STATUS			0x1c
+#define TPM_STATUS_CH0F			BIT(0)
+#define TPM_C0SC			0x20
+#define TPM_C0SC_CHIE			BIT(6)
+#define TPM_C0SC_MODE_SHIFT		2
+#define TPM_C0SC_MODE_MASK		0x3c
+#define TPM_C0SC_MODE_SW_COMPARE	0x4
+#define TPM_C0SC_CHF_MASK		(0x1 << 7)
+#define TPM_C0V				0x24
+
+static int counter_width __ro_after_init;
+static void __iomem *timer_base __ro_after_init;
+
+static inline void tpm_timer_disable(void)
+{
+	unsigned int val;
+
+	/* channel disable */
+	val = readl(timer_base + TPM_C0SC);
+	val &= ~(TPM_C0SC_MODE_MASK | TPM_C0SC_CHIE);
+	writel(val, timer_base + TPM_C0SC);
+}
+
+static inline void tpm_timer_enable(void)
+{
+	unsigned int val;
+
+	/* channel enabled in sw compare mode */
+	val = readl(timer_base + TPM_C0SC);
+	val |= (TPM_C0SC_MODE_SW_COMPARE << TPM_C0SC_MODE_SHIFT) |
+	       TPM_C0SC_CHIE;
+	writel(val, timer_base + TPM_C0SC);
+}
+
+static inline void tpm_irq_acknowledge(void)
+{
+	writel(TPM_STATUS_CH0F, timer_base + TPM_STATUS);
+}
+
+static inline unsigned long tpm_read_counter(void)
+{
+	return readl(timer_base + TPM_CNT);
+}
+
+#if defined(CONFIG_ARM)
+static struct delay_timer tpm_delay_timer;
+
+static unsigned long tpm_read_current_timer(void)
+{
+	return tpm_read_counter();
+}
+
+static u64 notrace tpm_read_sched_clock(void)
+{
+	return tpm_read_counter();
+}
+#endif
+
+static int tpm_set_next_event(unsigned long delta,
+				struct clock_event_device *evt)
+{
+	unsigned long next, now;
+
+	next = tpm_read_counter();
+	next += delta;
+	writel(next, timer_base + TPM_C0V);
+	now = tpm_read_counter();
+
+	/*
+	 * NOTE: We observed in a very small probability, the bus fabric
+	 * contention between GPU and A7 may results a few cycles delay
+	 * of writing CNT registers which may cause the min_delta event got
+	 * missed, so we need add a ETIME check here in case it happened.
+	 */
+	return (int)(next - now) <= 0 ? -ETIME : 0;
+}
+
+static int tpm_set_state_oneshot(struct clock_event_device *evt)
+{
+	tpm_timer_enable();
+
+	return 0;
+}
+
+static int tpm_set_state_shutdown(struct clock_event_device *evt)
+{
+	tpm_timer_disable();
+
+	return 0;
+}
+
+static irqreturn_t tpm_timer_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *evt = dev_id;
+
+	tpm_irq_acknowledge();
+
+	evt->event_handler(evt);
+
+	return IRQ_HANDLED;
+}
+
+static struct timer_of to_tpm = {
+	.flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
+	.clkevt = {
+		.name			= "i.MX TPM Timer",
+		.rating			= 200,
+		.features		= CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_DYNIRQ,
+		.set_state_shutdown	= tpm_set_state_shutdown,
+		.set_state_oneshot	= tpm_set_state_oneshot,
+		.set_next_event		= tpm_set_next_event,
+		.cpumask		= cpu_possible_mask,
+	},
+	.of_irq = {
+		.handler		= tpm_timer_interrupt,
+		.flags			= IRQF_TIMER,
+	},
+	.of_clk = {
+		.name = "per",
+	},
+};
+
+static int __init tpm_clocksource_init(void)
+{
+#if defined(CONFIG_ARM)
+	tpm_delay_timer.read_current_timer = &tpm_read_current_timer;
+	tpm_delay_timer.freq = timer_of_rate(&to_tpm) >> 3;
+	register_current_timer_delay(&tpm_delay_timer);
+
+	sched_clock_register(tpm_read_sched_clock, counter_width,
+			     timer_of_rate(&to_tpm) >> 3);
+#endif
+
+	return clocksource_mmio_init(timer_base + TPM_CNT,
+				     "imx-tpm",
+				     timer_of_rate(&to_tpm) >> 3,
+				     to_tpm.clkevt.rating,
+				     counter_width,
+				     clocksource_mmio_readl_up);
+}
+
+static void __init tpm_clockevent_init(void)
+{
+	clockevents_config_and_register(&to_tpm.clkevt,
+					timer_of_rate(&to_tpm) >> 3,
+					300,
+					GENMASK(counter_width - 1,
+					1));
+}
+
+static int __init tpm_timer_init(struct device_node *np)
+{
+	struct clk *ipg;
+	int ret;
+
+	ipg = of_clk_get_by_name(np, "ipg");
+	if (IS_ERR(ipg)) {
+		pr_err("tpm: failed to get ipg clk\n");
+		return -ENODEV;
+	}
+	/* enable clk before accessing registers */
+	ret = clk_prepare_enable(ipg);
+	if (ret) {
+		pr_err("tpm: ipg clock enable failed (%d)\n", ret);
+		clk_put(ipg);
+		return ret;
+	}
+
+	ret = timer_of_init(np, &to_tpm);
+	if (ret)
+		return ret;
+
+	timer_base = timer_of_base(&to_tpm);
+
+	counter_width = (readl(timer_base + TPM_PARAM)
+		& TPM_PARAM_WIDTH_MASK) >> TPM_PARAM_WIDTH_SHIFT;
+	/* use rating 200 for 32-bit counter and 150 for 16-bit counter */
+	to_tpm.clkevt.rating = counter_width == 0x20 ? 200 : 150;
+
+	/*
+	 * Initialize tpm module to a known state
+	 * 1) Counter disabled
+	 * 2) TPM counter operates in up counting mode
+	 * 3) Timer Overflow Interrupt disabled
+	 * 4) Channel0 disabled
+	 * 5) DMA transfers disabled
+	 */
+	/* make sure counter is disabled */
+	writel(0, timer_base + TPM_SC);
+	/* TOF is W1C */
+	writel(TPM_SC_TOF_MASK, timer_base + TPM_SC);
+	writel(0, timer_base + TPM_CNT);
+	/* CHF is W1C */
+	writel(TPM_C0SC_CHF_MASK, timer_base + TPM_C0SC);
+
+	/*
+	 * increase per cnt,
+	 * div 8 for 32-bit counter and div 128 for 16-bit counter
+	 */
+	writel(TPM_SC_CMOD_INC_PER_CNT |
+		(counter_width == 0x20 ?
+		TPM_SC_CMOD_DIV_DEFAULT : TPM_SC_CMOD_DIV_MAX),
+		timer_base + TPM_SC);
+
+	/* set MOD register to maximum for free running mode */
+	writel(GENMASK(counter_width - 1, 0), timer_base + TPM_MOD);
+
+	tpm_clockevent_init();
+
+	return tpm_clocksource_init();
+}
+TIMER_OF_DECLARE(imx7ulp, "fsl,imx7ulp-tpm", tpm_timer_init);