From: Daniel Thompson <daniel.thompson@linaro.org>
To: Russell King <linux@arm.linux.org.uk>
Cc: Daniel Thompson <daniel.thompson@linaro.org>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
kgdb-bugreport@lists.sourceforge.net, patches@linaro.org,
linaro-kernel@lists.linaro.org,
John Stultz <john.stultz@linaro.org>,
Anton Vorontsov <anton.vorontsov@linaro.org>,
Colin Cross <ccross@android.com>,
kernel-team@android.com, Rob Herring <robherring2@gmail.com>,
Linus Walleij <linus.walleij@linaro.org>,
Ben Dooks <ben.dooks@codethink.co.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Dave Martin <Dave.Martin@arm.com>,
Fabio Estevam <festevam@gmail.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Nicolas Pitre <nico@linaro.org>,
Srinivas Kandagatla <srinivas.kandagatla@gmail.com>,
Maxime Coquelin <maxime.coquelin@st.com>,
Patrice Chotard <patrice.chotard@st.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.cz>,
kernel@stlinux.com, linux-serial@vger.kernel.org
Subject: [PATCH v11 17/19] serial: asc: Adopt readl_/writel_relaxed()
Date: Tue, 2 Sep 2014 14:00:51 +0100 [thread overview]
Message-ID: <1409662853-29313-18-git-send-email-daniel.thompson@linaro.org> (raw)
In-Reply-To: <1409662853-29313-1-git-send-email-daniel.thompson@linaro.org>
The architectures where this peripheral exists (ARM and SH) have expensive
implementations of writel(), reliant on spin locks and explicit L2 cache
management. These architectures provide a cheaper writel_relaxed() which
is much better suited to peripherals that do not perform DMA. The
situation with readl()/readl_relaxed()is similar although less acute.
This driver does not use DMA and will be more power efficient and more
robust (due to absense of spin locks during console I/O) if it uses the
relaxed variants.
This change means the driver is no longer portable and therefore no
longer suitable for compile testing.
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@gmail.com>
Cc: Maxime Coquelin <maxime.coquelin@st.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: kernel@stlinux.com
Cc: linux-serial@vger.kernel.org
---
drivers/tty/serial/Kconfig | 2 +-
drivers/tty/serial/st-asc.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 26cec64d..e9b1735 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1527,7 +1527,7 @@ config SERIAL_FSL_LPUART_CONSOLE
config SERIAL_ST_ASC
tristate "ST ASC serial port support"
select SERIAL_CORE
- depends on ARM || COMPILE_TEST
+ depends on ARM
help
This driver is for the on-chip Asychronous Serial Controller on
STMicroelectronics STi SoCs.
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index 2b5eb6e..df709ee 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -152,12 +152,12 @@ static inline struct asc_port *to_asc_port(struct uart_port *port)
static inline u32 asc_in(struct uart_port *port, u32 offset)
{
- return readl(port->membase + offset);
+ return readl_relaxed(port->membase + offset);
}
static inline void asc_out(struct uart_port *port, u32 offset, u32 value)
{
- writel(value, port->membase + offset);
+ writel_relaxed(value, port->membase + offset);
}
/*
--
1.9.3
next prev parent reply other threads:[~2014-09-02 13:07 UTC|newest]
Thread overview: 194+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1403174303-25456-1-git-send-email-daniel.thompson@linaro.org>
2014-06-24 15:18 ` [PATCH v6 0/4] arm: KGDB NMI/FIQ support Daniel Thompson
2014-06-24 15:18 ` [PATCH v6 1/4] arm: fiq: Add callbacks to manage FIQ routings Daniel Thompson
2014-06-24 15:44 ` Nicolas Pitre
2014-06-24 15:58 ` Daniel Thompson
2014-06-24 15:18 ` [PATCH v6 2/4] arm: fiq: Allow EOI to be communicated to the intc Daniel Thompson
2014-06-24 15:46 ` Nicolas Pitre
2014-06-24 15:18 ` [PATCH v6 3/4] ARM: Move some macros from entry-armv to entry-header Daniel Thompson
2014-06-24 15:53 ` Nicolas Pitre
2014-06-24 15:18 ` [PATCH v6 4/4] ARM: Add KGDB/KDB FIQ debugger generic code Daniel Thompson
2014-06-24 16:08 ` Russell King - ARM Linux
2014-06-26 9:54 ` Daniel Thompson
2014-06-30 13:54 ` Daniel Thompson
2014-06-24 16:22 ` Nicolas Pitre
2014-06-26 12:48 ` Daniel Thompson
2014-06-30 8:53 ` [PATCH v7 0/4] arm: KGDB NMI/FIQ support Daniel Thompson
2014-06-30 8:53 ` [PATCH v7 1/4] arm: fiq: Add callbacks to manage FIQ routings Daniel Thompson
2014-06-30 8:53 ` [PATCH v7 2/4] arm: fiq: Allow EOI to be communicated to the intc Daniel Thompson
2014-06-30 8:53 ` [PATCH v7 3/4] ARM: Move some macros from entry-armv to entry-header Daniel Thompson
2014-06-30 8:53 ` [PATCH v7 4/4] ARM: Add KGDB/KDB FIQ debugger generic code Daniel Thompson
2014-07-10 8:03 ` [PATCH v8 0/4] arm: KGDB NMI/FIQ support Daniel Thompson
2014-07-10 8:03 ` [PATCH v8 1/4] arm: fiq: Add callbacks to manage FIQ routings Daniel Thompson
2014-07-10 8:03 ` [PATCH v8 2/4] arm: fiq: Allow ACK and EOI to be passed to the intc Daniel Thompson
2014-07-10 8:03 ` [PATCH v8 3/4] ARM: Move some macros from entry-armv to entry-header Daniel Thompson
2014-07-10 8:03 ` [PATCH v8 4/4] ARM: Add KGDB/KDB FIQ debugger generic code Daniel Thompson
2014-08-13 21:45 ` Russell King - ARM Linux
2014-08-14 10:48 ` Daniel Thompson
2014-08-14 11:15 ` [RFC PATCH 0/3] arm: FIQ IPI support Daniel Thompson
2014-08-14 11:15 ` [RFC PATCH 1/3] arm: smp: Introduce a special IPI signalled using FIQ Daniel Thompson
2014-08-14 11:15 ` [RFC PATCH 2/3] arm: kgdb: Add support for IPI FIQ roundup Daniel Thompson
2014-08-14 11:15 ` [RFC PATCH 3/3] irqchip: gic: Add support for IPI FIQ Daniel Thompson
2014-08-14 12:36 ` [PATCH v8 4/4] ARM: Add KGDB/KDB FIQ debugger generic code Russell King - ARM Linux
2014-08-14 15:02 ` Daniel Thompson
2014-07-14 13:51 ` [PATCH v8 0/4] arm: KGDB NMI/FIQ support Harro Haan
2014-07-15 9:41 ` Daniel Thompson
2014-07-15 13:04 ` Harro Haan
2014-07-15 14:52 ` Daniel Thompson
2014-07-15 15:59 ` Harro Haan
2014-07-15 17:08 ` Daniel Thompson
2014-07-16 17:15 ` Harro Haan
2014-07-17 9:01 ` Daniel Thompson
2014-07-15 18:45 ` Marek Vasut
2014-07-16 12:54 ` Daniel Thompson
2014-07-16 17:21 ` Harro Haan
2014-07-17 9:20 ` Daniel Thompson
2014-08-18 13:40 ` [PATCH v9 00/16] " Daniel Thompson
2014-08-18 13:40 ` [PATCH v9 01/16] arm: fiq: Add callbacks to manage FIQ routings Daniel Thompson
2014-08-18 13:40 ` [PATCH v9 02/16] arm: fiq: Allow ACK and EOI to be passed to the intc Daniel Thompson
2014-08-18 13:40 ` [PATCH v9 03/16] arm: fiq: Replace default FIQ handler Daniel Thompson
2014-08-18 13:40 ` [PATCH v9 04/16] arm: smp: Introduce a special IPI signalled using FIQ Daniel Thompson
2014-08-18 13:40 ` [PATCH v9 05/16] arm: KGDB/KDB FIQ support Daniel Thompson
2014-08-19 16:45 ` [PATCH v10 00/19] arm: KGDB NMI/FIQ support Daniel Thompson
2014-08-19 16:45 ` [PATCH v10 01/19] arm: fiq: Add callbacks to manage FIQ routings Daniel Thompson
2014-08-19 16:45 ` [PATCH v10 02/19] arm: fiq: Allow ACK and EOI to be passed to the intc Daniel Thompson
2014-08-19 16:45 ` [PATCH v10 03/19] arm: fiq: Replace default FIQ handler Daniel Thompson
2014-08-19 17:37 ` Russell King - ARM Linux
2014-08-19 18:12 ` Daniel Thompson
2014-08-28 15:01 ` Russell King - ARM Linux
2014-08-28 15:43 ` Paul E. McKenney
2014-08-28 15:54 ` Daniel Thompson
2014-08-28 16:15 ` Paul E. McKenney
2014-09-02 11:03 ` Daniel Thompson
2014-09-02 11:36 ` Russell King - ARM Linux
2014-09-02 11:49 ` Daniel Thompson
2014-09-02 14:23 ` Paul E. McKenney
2014-09-02 16:42 ` Russell King - ARM Linux
2014-09-03 10:21 ` Daniel Thompson
2014-09-03 19:34 ` Russell King - ARM Linux
2014-09-04 9:09 ` Daniel Thompson
2014-09-04 9:45 ` Russell King - ARM Linux
2014-09-04 10:04 ` Daniel Thompson
2014-08-19 16:45 ` [PATCH v10 04/19] arm: smp: Introduce a special IPI signalled using FIQ Daniel Thompson
2014-08-19 16:45 ` [PATCH v10 05/19] arm: KGDB/KDB FIQ support Daniel Thompson
2014-08-19 16:45 ` [PATCH v10 06/19] irqchip: gic: Provide support for interrupt grouping Daniel Thompson
2014-08-19 16:45 ` [PATCH v10 07/19] irqchip: gic: Add support for FIQ management Daniel Thompson
2014-08-19 16:45 ` [PATCH v10 08/19] irqchip: gic: Remove spin locks from eoi_irq Daniel Thompson
2014-08-19 16:45 ` [PATCH v10 09/19] irqchip: gic: Add support for IPI FIQ Daniel Thompson
2014-08-19 16:46 ` [PATCH v10 10/19] irqchip: gic: Group 0 workaround Daniel Thompson
2014-08-19 16:46 ` [PATCH v10 11/19] irqchip: vic: Add support for FIQ management Daniel Thompson
2014-08-19 16:46 ` [PATCH v10 12/19] serial: kgdb_nmi: No CON_ENABLED by default Daniel Thompson
2014-08-19 16:46 ` [PATCH v10 13/19] serial: amba-pl011: Use container_of() to get uart_amba_port Daniel Thompson
2014-08-19 16:46 ` [PATCH v10 14/19] serial: amba-pl011: Move pl011_hwinit() Daniel Thompson
2014-08-19 16:46 ` [PATCH v10 15/19] serial: amba-pl011: Pass FIQ information to KGDB Daniel Thompson
2014-08-19 16:46 ` [PATCH v10 16/19] serial: asc: Add support for KGDB's FIQ/NMI mode Daniel Thompson
2014-08-19 16:46 ` [PATCH v10 17/19] serial: asc: Adopt readl_/writel_relaxed() Daniel Thompson
2014-08-19 16:46 ` [PATCH v10 18/19] serial: imx: clean up imx_poll_get_char() Daniel Thompson
2014-08-19 16:46 ` [PATCH v10 19/19] serial: imx: Add support for KGDB's FIQ/NMI mode Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 00/19] arm: KGDB NMI/FIQ support Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 01/19] arm: fiq: Add callbacks to manage FIQ routings Daniel Thompson
2014-09-02 18:51 ` Russell King - ARM Linux
2014-09-03 0:03 ` Thomas Gleixner
2014-09-03 8:27 ` Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 02/19] arm: fiq: Allow ACK and EOI to be passed to the intc Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 03/19] arm: fiq: Replace default FIQ handler Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 04/19] arm: smp: Introduce a special IPI signalled using FIQ Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 05/19] arm: KGDB/KDB FIQ support Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 06/19] irqchip: gic: Provide support for interrupt grouping Daniel Thompson
2014-09-02 19:33 ` Russell King - ARM Linux
2014-09-02 21:36 ` Catalin Marinas
2014-09-03 9:44 ` Daniel Thompson
2014-09-03 9:28 ` Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 07/19] irqchip: gic: Add support for FIQ management Daniel Thompson
2014-09-02 19:36 ` Russell King - ARM Linux
2014-09-02 13:00 ` [PATCH v11 08/19] irqchip: gic: Remove spin locks from eoi_irq Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 09/19] irqchip: gic: Add support for IPI FIQ Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 10/19] irqchip: gic: Group 0 workaround Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 11/19] irqchip: vic: Add support for FIQ management Daniel Thompson
2014-09-02 19:40 ` Russell King - ARM Linux
2014-09-02 13:00 ` [PATCH v11 12/19] serial: kgdb_nmi: No CON_ENABLED by default Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 13/19] serial: amba-pl011: Use container_of() to get uart_amba_port Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 14/19] serial: amba-pl011: Move pl011_hwinit() Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 15/19] serial: amba-pl011: Pass FIQ information to KGDB Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 16/19] serial: asc: Add support for KGDB's FIQ/NMI mode Daniel Thompson
2014-09-02 13:00 ` Daniel Thompson [this message]
2014-09-02 13:42 ` [STLinux Kernel] [PATCH v11 17/19] serial: asc: Adopt readl_/writel_relaxed() Peter Griffin
2014-09-02 13:55 ` Maxime Coquelin
2014-09-02 13:00 ` [PATCH v11 18/19] serial: imx: clean up imx_poll_get_char() Daniel Thompson
2014-09-02 13:00 ` [PATCH v11 19/19] serial: imx: Add support for KGDB's FIQ/NMI mode Daniel Thompson
2014-09-02 23:02 ` [PATCH v11 00/19] arm: KGDB NMI/FIQ support Thomas Gleixner
2014-09-03 9:02 ` Daniel Thompson
2014-09-03 10:06 ` Thomas Gleixner
2014-09-03 10:30 ` Daniel Thompson
2014-09-04 16:03 ` [PATCH v1 0/6] arm: Implement arch_trigger_all_cpu_backtrace Daniel Thompson
2014-09-04 16:03 ` [PATCH v1 1/6] arm: fiq: Replace default FIQ handler Daniel Thompson
2014-09-04 18:57 ` Nicolas Pitre
2014-09-05 9:03 ` Daniel Thompson
2014-09-05 18:04 ` Nicolas Pitre
2014-09-08 13:22 ` Daniel Thompson
2014-09-04 16:03 ` [PATCH v1 2/6] arm: smp: Introduce a non-maskable IPI Daniel Thompson
2014-09-04 16:03 ` [PATCH v1 3/6] arm64: Introduce dummy version of asm/fiq.h Daniel Thompson
2014-09-04 16:03 ` [PATCH v1 4/6] irqchip: gic: Add support for IPI FIQ Daniel Thompson
2014-09-04 16:03 ` [PATCH v1 5/6] irqchip: gic: Group 0 workaround Daniel Thompson
2014-09-04 16:03 ` [PATCH v1 6/6] arm: Implement arch_trigger_all_cpu_backtrace Daniel Thompson
2014-09-05 15:33 ` [PATCH v2 0/5] " Daniel Thompson
2014-09-05 15:33 ` [PATCH v2 1/5] ARM: remove unused do_unexp_fiq() function Daniel Thompson
2014-09-05 15:33 ` [PATCH v2 2/5] ARM: add basic support for on-demand backtrace of other CPUs Daniel Thompson
2014-09-05 15:33 ` [PATCH v2 3/5] arm: fiq: Replace default FIQ handler Daniel Thompson
2014-09-05 15:33 ` [PATCH v2 4/5] arm64: Introduce dummy version of asm/fiq.h Daniel Thompson
2014-09-05 16:50 ` Catalin Marinas
2014-09-08 11:03 ` Daniel Thompson
2014-09-05 15:33 ` [PATCH v2 5/5] irqchip: gic: Add support for IPI FIQ Daniel Thompson
2014-09-08 15:28 ` [PATCH v3 0/5] arm: Implement arch_trigger_all_cpu_backtrace Daniel Thompson
2014-09-08 15:28 ` [PATCH v3 1/5] ARM: remove unused do_unexp_fiq() function Daniel Thompson
2014-09-08 15:28 ` [PATCH v3 2/5] ARM: add basic support for on-demand backtrace of other CPUs Daniel Thompson
2014-09-08 15:28 ` [PATCH v3 3/5] arm: fiq: Replace default FIQ handler Daniel Thompson
2014-09-08 15:49 ` Nicolas Pitre
2014-09-08 15:57 ` Daniel Thompson
2014-09-08 15:28 ` [PATCH v3 4/5] arm64: Introduce dummy version of asm/fiq.h Daniel Thompson
2014-09-08 15:28 ` [PATCH v3 5/5] irqchip: gic: Add support for IPI FIQ Daniel Thompson
2014-09-08 16:23 ` Russell King - ARM Linux
2014-09-09 8:24 ` Daniel Thompson
2014-09-14 11:53 ` Daniel Thompson
2014-09-08 16:24 ` [PATCH v3 0/5] arm: Implement arch_trigger_all_cpu_backtrace Russell King - ARM Linux
2014-09-09 8:26 ` Daniel Thompson
2014-09-09 14:15 ` [PATCH v4 0/6] " Daniel Thompson
2014-09-09 14:15 ` [PATCH v4 1/6] ARM: remove unused do_unexp_fiq() function Daniel Thompson
2014-09-09 14:15 ` [PATCH v4 2/6] arm: fiq: Replace default FIQ handler Daniel Thompson
2014-09-09 14:15 ` [PATCH v4 3/6] arm64: Introduce dummy version of asm/fiq.h Daniel Thompson
2014-09-09 14:15 ` [PATCH v4 4/6] irqchip: gic: Add support for IPI FIQ Daniel Thompson
2014-09-09 14:15 ` [PATCH v4 5/6] ARM: add basic support for on-demand backtrace of other CPUs Daniel Thompson
2014-09-09 14:15 ` [PATCH v4 6/6] arm: smp: Handle ipi_cpu_backtrace() using FIQ (if available) Daniel Thompson
2014-09-11 11:31 ` [PATCH 3.17-rc4 v5 0/6] arm: Implement arch_trigger_all_cpu_backtrace Daniel Thompson
2014-09-11 11:31 ` [PATCH 3.17-rc4 v5 1/6] ARM: remove unused do_unexp_fiq() function Daniel Thompson
2014-09-11 11:31 ` [PATCH 3.17-rc4 v5 2/6] arm: fiq: Replace default FIQ handler Daniel Thompson
2014-09-12 17:03 ` Russell King - ARM Linux
2014-09-12 17:07 ` Russell King - ARM Linux
2014-09-13 12:01 ` Daniel Thompson
2014-09-12 17:08 ` Russell King - ARM Linux
2014-09-12 17:14 ` Russell King - ARM Linux
2014-09-12 17:19 ` Russell King - ARM Linux
2014-09-12 17:23 ` Russell King - ARM Linux
2014-09-14 6:36 ` Daniel Thompson
2014-09-14 8:45 ` Russell King - ARM Linux
2014-09-14 11:27 ` Daniel Thompson
2014-09-13 12:03 ` Daniel Thompson
2014-09-11 11:31 ` [PATCH 3.17-rc4 v5 3/6] arm64: Introduce dummy version of asm/fiq.h Daniel Thompson
2014-09-11 11:31 ` [PATCH 3.17-rc4 v5 4/6] irqchip: gic: Add support for IPI FIQ Daniel Thompson
2014-09-11 11:31 ` [PATCH 3.17-rc4 v5 5/6] ARM: add basic support for on-demand backtrace of other CPUs Daniel Thompson
2014-09-11 11:31 ` [PATCH 3.17-rc4 v5 6/6] arm: smp: Handle ipi_cpu_backtrace() using FIQ (if available) Daniel Thompson
2014-08-18 14:12 ` [PATCH v9 06/16] irqchip: gic: Provide support for interrupt grouping Daniel Thompson
2014-08-18 14:12 ` [PATCH v9 07/16] irqchip: gic: Add support for FIQ management Daniel Thompson
2014-08-18 14:12 ` [PATCH v9 08/16] irqchip: gic: Remove spin locks from eoi_irq Daniel Thompson
2014-08-18 14:12 ` [PATCH v9 09/16] irqchip: gic: Add support for IPI FIQ Daniel Thompson
2014-08-18 14:12 ` [PATCH v9 10/16] irqchip: gic: Group 0 workaround Daniel Thompson
2014-08-18 14:12 ` [PATCH v9 11/16] irqchip: vic: Add support for FIQ management Daniel Thompson
2014-08-18 14:28 ` [PATCH v9 12/16] serial: amba-pl011: Pass FIQ information to KGDB Daniel Thompson
2014-08-18 18:30 ` Peter Hurley
2014-08-19 9:08 ` Daniel Thompson
2014-08-19 11:58 ` Peter Hurley
2014-08-19 12:51 ` Daniel Thompson
2014-08-18 14:28 ` [PATCH v9 13/16] serial: asc: Add support for KGDB's FIQ/NMI mode Daniel Thompson
2014-08-18 14:28 ` [PATCH v9 14/16] serial: asc: Adopt readl_/writel_relaxed() Daniel Thompson
2014-08-18 14:28 ` [PATCH v9 15/16] serial: imx: clean up imx_poll_get_char() Daniel Thompson
2014-08-18 14:28 ` [PATCH v9 16/16] serial: imx: Add support for KGDB's FIQ/NMI mode Daniel Thompson
2014-08-18 17:32 ` Dirk Behme
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