linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: fu.wei@linaro.org
To: rjw@rjwysocki.net, lenb@kernel.org, daniel.lezcano@linaro.org,
	tglx@linutronix.de, marc.zyngier@arm.com, mark.rutland@arm.com,
	lorenzo.pieralisi@arm.com, sudeep.holla@arm.com,
	hanjun.guo@linaro.org
Cc: linux-arm-kernel@lists.infradead.org,
	linaro-acpi@lists.linaro.org, linux-kernel@vger.kernel.org,
	linux-acpi@vger.kernel.org, rruigrok@codeaurora.org,
	harba@codeaurora.org, cov@codeaurora.org, timur@codeaurora.org,
	graeme.gregory@linaro.org, al.stone@linaro.org, jcm@redhat.com,
	wei@redhat.com, arnd@arndb.de, catalin.marinas@arm.com,
	will.deacon@arm.com, Suravee.Suthikulpanit@amd.com,
	leo.duran@amd.com, wim@iguana.be, linux@roeck-us.net,
	linux-watchdog@vger.kernel.org, tn@semihalf.com,
	christoffer.dall@linaro.org, julien.grall@arm.com,
	Fu Wei <fu.wei@linaro.org>
Subject: [PATCH v19 13/15] acpi/arm64: Add memory-mapped timer support in GTDT driver
Date: Wed, 21 Dec 2016 14:46:01 +0800	[thread overview]
Message-ID: <20161221064603.11830-14-fu.wei@linaro.org> (raw)
In-Reply-To: <20161221064603.11830-1-fu.wei@linaro.org>

From: Fu Wei <fu.wei@linaro.org>

On platforms booting with ACPI, architected memory-mapped timers'
configuration data is provided by firmware through the ACPI GTDT
static table.

The clocksource architected timer kernel driver requires a firmware
interface to collect timer configuration and configure its driver.
this infrastructure is present for device tree systems, but it is
missing on systems booting with ACPI.

Implement the kernel infrastructure required to parse the static
ACPI GTDT table so that the architected timer clocksource driver can
make use of it on systems booting with ACPI, therefore enabling
the corresponding timers configuration.

Signed-off-by: Fu Wei <fu.wei@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 drivers/acpi/arm64/gtdt.c | 124 ++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/acpi.h      |   1 +
 2 files changed, 125 insertions(+)

diff --git a/drivers/acpi/arm64/gtdt.c b/drivers/acpi/arm64/gtdt.c
index d93a790..91ea6cb 100644
--- a/drivers/acpi/arm64/gtdt.c
+++ b/drivers/acpi/arm64/gtdt.c
@@ -37,6 +37,28 @@ struct acpi_gtdt_descriptor {
 
 static struct acpi_gtdt_descriptor acpi_gtdt_desc __initdata;
 
+static inline void *next_platform_timer(void *platform_timer)
+{
+	struct acpi_gtdt_header *gh = platform_timer;
+
+	platform_timer += gh->length;
+	if (platform_timer < acpi_gtdt_desc.gtdt_end)
+		return platform_timer;
+
+	return NULL;
+}
+
+#define for_each_platform_timer(_g)				\
+	for (_g = acpi_gtdt_desc.platform_timer; _g;	\
+	     _g = next_platform_timer(_g))
+
+static inline bool is_timer_block(void *platform_timer)
+{
+	struct acpi_gtdt_header *gh = platform_timer;
+
+	return gh->type == ACPI_GTDT_TYPE_TIMER_BLOCK;
+}
+
 static int __init map_gt_gsi(u32 interrupt, u32 flags)
 {
 	int trigger, polarity;
@@ -155,3 +177,105 @@ int __init acpi_gtdt_init(struct acpi_table_header *table,
 
 	return ret;
 }
+
+static int __init gtdt_parse_timer_block(struct acpi_gtdt_timer_block *block,
+					 struct arch_timer_mem *data)
+{
+	int i;
+	struct acpi_gtdt_timer_entry *frame;
+
+	if (!block->timer_count) {
+		pr_err(FW_BUG "GT block present, but frame count is zero.");
+		return -ENODEV;
+	}
+
+	if (block->timer_count > ARCH_TIMER_MEM_MAX_FRAMES) {
+		pr_err(FW_BUG "GT block lists %d frames, ACPI spec only allows 8\n",
+		       block->timer_count);
+		return -EINVAL;
+	}
+
+	data->cntctlbase = (phys_addr_t)block->block_address;
+	/*
+	 * According to "Table * CNTCTLBase memory map" of
+	 * <ARM Architecture Reference Manual> for ARMv8,
+	 * The size of the CNTCTLBase frame is 4KB(Offset 0x000 – 0xFFC).
+	 */
+	data->size = SZ_4K;
+	data->num_frames = block->timer_count;
+
+	frame = (void *)block + block->timer_offset;
+	if (frame + block->timer_count != (void *)block + block->header.length)
+		return -EINVAL;
+
+	/*
+	 * Get the GT timer Frame data for every GT Block Timer
+	 */
+	for (i = 0; i < block->timer_count; i++, frame++) {
+		if (!frame->base_address || !frame->timer_interrupt)
+			return -EINVAL;
+
+		data->frame[i].phys_irq = map_gt_gsi(frame->timer_interrupt,
+						     frame->timer_flags);
+		if (data->frame[i].phys_irq <= 0) {
+			pr_warn("failed to map physical timer irq in frame %d.\n",
+				i);
+			return -EINVAL;
+		}
+
+		data->frame[i].virt_irq =
+			map_gt_gsi(frame->virtual_timer_interrupt,
+				   frame->virtual_timer_flags);
+		if (data->frame[i].virt_irq <= 0) {
+			pr_warn("failed to map virtual timer irq in frame %d.\n",
+				i);
+			acpi_unregister_gsi(frame->timer_interrupt);
+			return -EINVAL;
+		}
+
+		data->frame[i].frame_nr = frame->frame_number;
+		data->frame[i].cntbase = frame->base_address;
+		/*
+		 * According to "Table * CNTBaseN memory map" of
+		 * <ARM Architecture Reference Manual> for ARMv8,
+		 * The size of the CNTBaseN frame is 4KB(Offset 0x000 – 0xFFC).
+		 */
+		data->frame[i].size = SZ_4K;
+	}
+
+	return 0;
+}
+
+/**
+ * acpi_arch_timer_mem_init() - Get the info of all GT blocks in GTDT table.
+ * @data:	the pointer to the array of struct arch_timer_mem for returning
+ *		the result of parsing. The element number of this array should
+ *		be platform_timer_count(the total number of platform timers).
+ * @count:	The pointer of int variate for returning the number of GT
+ *		blocks we have parsed.
+ *
+ * Return: 0 if success, -EINVAL/-ENODEV if error.
+ */
+int __init acpi_arch_timer_mem_init(struct arch_timer_mem *data,
+				    int *timer_count)
+{
+	int ret;
+	void *platform_timer;
+
+	*timer_count = 0;
+	for_each_platform_timer(platform_timer) {
+		if (is_timer_block(platform_timer)) {
+			ret = gtdt_parse_timer_block(platform_timer, data);
+			if (ret)
+				return ret;
+			data++;
+			(*timer_count)++;
+		}
+	}
+
+	if (*timer_count)
+		pr_info("found %d memory-mapped timer block(s).\n",
+			*timer_count);
+
+	return 0;
+}
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index d0b271e..51e85b9 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -601,6 +601,7 @@ int acpi_reconfig_notifier_unregister(struct notifier_block *nb);
 int acpi_gtdt_init(struct acpi_table_header *table, int *platform_timer_count);
 int acpi_gtdt_map_ppi(int type);
 bool acpi_gtdt_c3stop(int type);
+int acpi_arch_timer_mem_init(struct arch_timer_mem *data, int *timer_count);
 #endif
 
 #else	/* !CONFIG_ACPI */
-- 
2.9.3

  parent reply	other threads:[~2016-12-21  6:48 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-21  6:45 [PATCH v19 00/15] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer fu.wei
2016-12-21  6:45 ` [PATCH v19 01/15] clocksource/drivers/arm_arch_timer: Move enums and defines to header file fu.wei
2016-12-21  6:45 ` [PATCH v19 02/15] clocksource/drivers/arm_arch_timer: Add a new enum for spi type fu.wei
2016-12-21  6:45 ` [PATCH v19 03/15] clocksource/drivers/arm_arch_timer: Improve printk relevant code fu.wei
2016-12-21  6:45 ` [PATCH v19 04/15] clocksource/drivers/arm_arch_timer: rename some enums and defines fu.wei
2016-12-21  6:45 ` [PATCH v19 05/15] clocksource/drivers/arm_arch_timer: rework PPI determination fu.wei
2017-01-16 17:29   ` Mark Rutland
2017-01-17 23:49     ` Fu Wei
2016-12-21  6:45 ` [PATCH v19 06/15] clocksource/drivers/arm_arch_timer: Rework counter frequency detection fu.wei
2017-01-16 17:50   ` Mark Rutland
2017-01-18  4:27     ` Fu Wei
2016-12-21  6:45 ` [PATCH v19 07/15] clocksource/drivers/arm_arch_timer: Refactor arch_timer_needs_probing fu.wei
2016-12-21  6:45 ` [PATCH v19 08/15] clocksource/drivers/arm_arch_timer: move arch_timer_needs_of_probing into DT init call fu.wei
2016-12-21  6:45 ` [PATCH v19 09/15] clocksource/drivers/arm_arch_timer: Introduce some new structs to prepare for GTDT fu.wei
2016-12-21  6:45 ` [PATCH v19 10/15] clocksource/drivers/arm_arch_timer: Refactor the timer init code " fu.wei
2017-01-16 18:30   ` Mark Rutland
2017-01-17 10:30     ` Fu Wei
2017-01-17 10:39       ` Fu Wei
2017-01-17 12:18       ` Timur Tabi
2017-01-17 12:29         ` Mark Rutland
2017-01-17 13:22           ` Fu Wei
2016-12-21  6:45 ` [PATCH v19 11/15] acpi/arm64: Add GTDT table parse driver fu.wei
2016-12-21  6:46 ` [PATCH v19 12/15] clocksource/drivers/arm_arch_timer: Simplify ACPI support code fu.wei
2016-12-21  6:46 ` fu.wei [this message]
2016-12-21  6:46 ` [PATCH v19 14/15] clocksource/drivers/arm_arch_timer: Add GTDT support for memory-mapped timer fu.wei
2016-12-21  6:46 ` [PATCH v19 15/15] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver fu.wei
2017-01-16  6:26 ` [PATCH v19 00/15] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer Fu Wei
2017-01-16 12:01   ` Mark Rutland
2017-01-16 12:04     ` Fu Wei
2017-01-16 17:00 ` Mark Rutland
2017-01-17  9:14   ` Fu Wei

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20161221064603.11830-14-fu.wei@linaro.org \
    --to=fu.wei@linaro.org \
    --cc=Suravee.Suthikulpanit@amd.com \
    --cc=al.stone@linaro.org \
    --cc=arnd@arndb.de \
    --cc=catalin.marinas@arm.com \
    --cc=christoffer.dall@linaro.org \
    --cc=cov@codeaurora.org \
    --cc=daniel.lezcano@linaro.org \
    --cc=graeme.gregory@linaro.org \
    --cc=hanjun.guo@linaro.org \
    --cc=harba@codeaurora.org \
    --cc=jcm@redhat.com \
    --cc=julien.grall@arm.com \
    --cc=lenb@kernel.org \
    --cc=leo.duran@amd.com \
    --cc=linaro-acpi@lists.linaro.org \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-watchdog@vger.kernel.org \
    --cc=linux@roeck-us.net \
    --cc=lorenzo.pieralisi@arm.com \
    --cc=marc.zyngier@arm.com \
    --cc=mark.rutland@arm.com \
    --cc=rjw@rjwysocki.net \
    --cc=rruigrok@codeaurora.org \
    --cc=sudeep.holla@arm.com \
    --cc=tglx@linutronix.de \
    --cc=timur@codeaurora.org \
    --cc=tn@semihalf.com \
    --cc=wei@redhat.com \
    --cc=will.deacon@arm.com \
    --cc=wim@iguana.be \
    --subject='Re: [PATCH v19 13/15] acpi/arm64: Add memory-mapped timer support in GTDT driver' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).