[PATCHv5 0/2] socfpga: support suspend to ram

[PATCHv5 0/2] socfpga: support suspend to ram

[Alan Tull]

Support suspend to ram on socfpga.
  * allocate space in ocram using sram driver.
  * Add a function in ocram to place DDR in self-refresh
    and suspend.
  * Prevent suspend if EDAC is enabled.
  * Add a device tree binding document for the Altera
    SOCFPGA SDRAM controller that is used to put DDR in
    self-refresh mode.

Alan Tull (2):
  ARM: socfpga: support suspend to ram
  ARM: socfpga: dts: add sdram controller dt binding doc

 .../arm/altera/socfpga-sdram-controller.txt        |   12 ++
 arch/arm/mach-socfpga/Kconfig                      |   10 +-
 arch/arm/mach-socfpga/Makefile                     |    1 +
 arch/arm/mach-socfpga/core.h                       |    6 +-
 arch/arm/mach-socfpga/pm.c                         |  149 ++++++++++++++++++++
 arch/arm/mach-socfpga/self-refresh.S               |  136 ++++++++++++++++++
 arch/arm/mach-socfpga/socfpga.c                    |    6 +-
 drivers/edac/altera_edac.c                         |   20 +++
 8 files changed, 337 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/arm/altera/socfpga-sdram-controller.txt
 create mode 100644 arch/arm/mach-socfpga/pm.c
 create mode 100644 arch/arm/mach-socfpga/self-refresh.S

-- 
1.7.9.5

[PATCHv5 1/2] ARM: socfpga: support suspend to ram

[Alan Tull]

Add code that requests that the sdr controller go into
self-refresh mode.  This code is run from ocram.

Suspend-to-RAM and EDAC support are mutually exclusive on
SOCFPGA.  If the EDAC is enabled, it will prevent the
platform from going into suspend.

Example of how to request to suspend to ram:
 $ echo enabled > \
/sys/devices/soc/ffc02000.serial0/tty/ttyS0/power/wakeup

 $ echo -n mem > /sys/power/state

Signed-off-by: Alan Tull <atull-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org>
Cc: Pavel Machek <pavel-ynQEQJNshbs@public.gmane.org>
Cc: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
Cc: Dinh Nguyen <dinguyen-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org>
Cc: Steffen Trumtrar <s.trumtrar-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
---
v2: use Generic on-chip SRAM driver to allocate ocram
    rm fncpy_align since generic allocator handles alignment
    check __arm_ioremap_exec return code
    check for NULL pointers
    add a comment regarding sdram controller configuration
v3: fix renamed #define
    propagate socfpga_setup_ocram_self_refresh error code
v4: Kconfig: don't need to select GENERIC_ALLOCATER
    add CONFIG_SOCFPGA_SUSPEND
    make s2r and EDAC support mutually exclusive
    socfpga.c: add sdr_ctl_base_addr
    return error if ocram not available in device tree
    update copyright years
v5: remove compile time dependency
    edac driver will prevent suspend
    don't configure scu standby mode; done in enable_scu().
    fix comments about required sdram controller configuration
---
 arch/arm/mach-socfpga/Kconfig        |   10 ++-
 arch/arm/mach-socfpga/Makefile       |    1 +
 arch/arm/mach-socfpga/core.h         |    6 +-
 arch/arm/mach-socfpga/pm.c           |  149 ++++++++++++++++++++++++++++++++++
 arch/arm/mach-socfpga/self-refresh.S |  136 +++++++++++++++++++++++++++++++
 arch/arm/mach-socfpga/socfpga.c      |    6 +-
 drivers/edac/altera_edac.c           |   20 +++++
 7 files changed, 325 insertions(+), 3 deletions(-)
 create mode 100644 arch/arm/mach-socfpga/pm.c
 create mode 100644 arch/arm/mach-socfpga/self-refresh.S

diff --git a/arch/arm/mach-socfpga/Kconfig b/arch/arm/mach-socfpga/Kconfig
index b5f8d75..b26a684 100644
--- a/arch/arm/mach-socfpga/Kconfig
+++ b/arch/arm/mach-socfpga/Kconfig
@@ -1,4 +1,4 @@
-config ARCH_SOCFPGA
+menuconfig ARCH_SOCFPGA
 	bool "Altera SOCFPGA family" if ARCH_MULTI_V7
 	select ARM_AMBA
 	select ARM_GIC
@@ -8,3 +8,11 @@ config ARCH_SOCFPGA
 	select HAVE_ARM_SCU
 	select HAVE_ARM_TWD if SMP
 	select MFD_SYSCON
+
+if ARCH_SOCFPGA
+config SOCFPGA_SUSPEND
+	bool "Suspend to RAM on SOCFPGA"
+	help
+	  Select this if you want to enable Suspend-to-RAM on SOCFPGA
+	  platforms.
+endif
diff --git a/arch/arm/mach-socfpga/Makefile b/arch/arm/mach-socfpga/Makefile
index 6dd7a93..b8f9e23 100644
--- a/arch/arm/mach-socfpga/Makefile
+++ b/arch/arm/mach-socfpga/Makefile
@@ -4,3 +4,4 @@
 
 obj-y					:= socfpga.o
 obj-$(CONFIG_SMP)	+= headsmp.o platsmp.o
+obj-$(CONFIG_SOCFPGA_SUSPEND)	+= pm.o self-refresh.o
diff --git a/arch/arm/mach-socfpga/core.h b/arch/arm/mach-socfpga/core.h
index 7637b7f..35472f2 100644
--- a/arch/arm/mach-socfpga/core.h
+++ b/arch/arm/mach-socfpga/core.h
@@ -1,6 +1,6 @@
 /*
  * Copyright 2012 Pavel Machek <pavel-ynQEQJNshbs@public.gmane.org>
- * Copyright (C) 2012 Altera Corporation
+ * Copyright (C) 2012-2015 Altera Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -40,6 +40,10 @@ extern void socfpga_sysmgr_init(void);
 
 extern void __iomem *sys_manager_base_addr;
 extern void __iomem *rst_manager_base_addr;
+extern void __iomem *sdr_ctl_base_addr;
+
+u32 socfpga_sdram_self_refresh(u32 sdr_base);
+extern unsigned int socfpga_sdram_self_refresh_sz;
 
 extern struct smp_operations socfpga_smp_ops;
 extern char secondary_trampoline, secondary_trampoline_end;
diff --git a/arch/arm/mach-socfpga/pm.c b/arch/arm/mach-socfpga/pm.c
new file mode 100644
index 0000000..1ed89fc
--- /dev/null
+++ b/arch/arm/mach-socfpga/pm.c
@@ -0,0 +1,149 @@
+/*
+ *  arch/arm/mach-socfpga/pm.c
+ *
+ * Copyright (C) 2014-2015 Altera Corporation. All rights reserved.
+ *
+ * with code from pm-imx6.c
+ * Copyright 2011-2014 Freescale Semiconductor, Inc.
+ * Copyright 2011 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/bitops.h>
+#include <linux/genalloc.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+#include <linux/suspend.h>
+#include <asm/suspend.h>
+#include <asm/fncpy.h>
+#include "core.h"
+
+/* Pointer to function copied to ocram */
+static u32 (*socfpga_sdram_self_refresh_in_ocram)(u32 sdr_base);
+
+static int socfpga_setup_ocram_self_refresh(void)
+{
+	struct platform_device *pdev;
+	phys_addr_t ocram_pbase;
+	struct device_node *np;
+	struct gen_pool *ocram_pool;
+	unsigned long ocram_base;
+	void __iomem *suspend_ocram_base;
+	int ret = 0;
+
+	np = of_find_compatible_node(NULL, NULL, "mmio-sram");
+	if (!np) {
+		pr_err("%s: Unable to find mmio-sram in dtb\n", __func__);
+		return -ENODEV;
+	}
+
+	pdev = of_find_device_by_node(np);
+	if (!pdev) {
+		pr_warn("%s: failed to find ocram device!\n", __func__);
+		ret = -ENODEV;
+		goto put_node;
+	}
+
+	ocram_pool = dev_get_gen_pool(&pdev->dev);
+	if (!ocram_pool) {
+		pr_warn("%s: ocram pool unavailable!\n", __func__);
+		ret = -ENODEV;
+		goto put_node;
+	}
+
+	ocram_base = gen_pool_alloc(ocram_pool, socfpga_sdram_self_refresh_sz);
+	if (!ocram_base) {
+		pr_warn("%s: unable to alloc ocram!\n", __func__);
+		ret = -ENOMEM;
+		goto put_node;
+	}
+
+	ocram_pbase = gen_pool_virt_to_phys(ocram_pool, ocram_base);
+
+	suspend_ocram_base = __arm_ioremap_exec(ocram_pbase,
+						socfpga_sdram_self_refresh_sz,
+						false);
+	if (!suspend_ocram_base) {
+		pr_warn("%s: __arm_ioremap_exec failed!\n", __func__);
+		ret = -ENOMEM;
+		goto put_node;
+	}
+
+	/* Copy the code that puts DDR in self refresh to ocram */
+	socfpga_sdram_self_refresh_in_ocram =
+		(void *)fncpy(suspend_ocram_base,
+			      &socfpga_sdram_self_refresh,
+			      socfpga_sdram_self_refresh_sz);
+
+	WARN(!socfpga_sdram_self_refresh_in_ocram,
+	     "could not copy function to ocram");
+	if (!socfpga_sdram_self_refresh_in_ocram)
+		ret = -EFAULT;
+
+put_node:
+	of_node_put(np);
+
+	return ret;
+}
+
+static int socfpga_pm_suspend(unsigned long arg)
+{
+	u32 ret;
+
+	if (!sdr_ctl_base_addr)
+		return -EFAULT;
+
+	ret = socfpga_sdram_self_refresh_in_ocram((u32)sdr_ctl_base_addr);
+
+	pr_debug("%s self-refresh loops request=%d exit=%d\n", __func__,
+		 ret & 0xffff, (ret >> 16) & 0xffff);
+
+	return 0;
+}
+
+static int socfpga_pm_enter(suspend_state_t state)
+{
+	switch (state) {
+	case PM_SUSPEND_STANDBY:
+	case PM_SUSPEND_MEM:
+		outer_disable();
+		cpu_suspend(0, socfpga_pm_suspend);
+		outer_resume();
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static const struct platform_suspend_ops socfpga_pm_ops = {
+	.valid	= suspend_valid_only_mem,
+	.enter	= socfpga_pm_enter,
+};
+
+static int __init socfpga_pm_init(void)
+{
+	int ret;
+
+	ret = socfpga_setup_ocram_self_refresh();
+	if (ret)
+		return ret;
+
+	suspend_set_ops(&socfpga_pm_ops);
+	pr_info("SoCFPGA initialized for DDR self-refresh during suspend.\n");
+
+	return 0;
+}
+arch_initcall(socfpga_pm_init);
diff --git a/arch/arm/mach-socfpga/self-refresh.S b/arch/arm/mach-socfpga/self-refresh.S
new file mode 100644
index 0000000..f2d7f88
--- /dev/null
+++ b/arch/arm/mach-socfpga/self-refresh.S
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2014-2015 Altera Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+#define MAX_LOOP_COUNT		1000
+
+/* Register offset */
+#define SDR_CTRLGRP_LOWPWREQ_ADDR       0x54
+#define SDR_CTRLGRP_LOWPWRACK_ADDR      0x58
+
+/* Bitfield positions */
+#define SELFRSHREQ_POS                  3
+#define SELFRSHREQ_MASK                 0x8
+
+#define SELFRFSHACK_POS                 1
+#define SELFRFSHACK_MASK                0x2
+
+	/*
+	 * This code assumes that when the bootloader configured
+	 * the sdram controller for the DDR on the board it
+	 * configured the following fields depending on the DDR
+	 * vendor/configuration:
+	 *
+	 * sdr.ctrlcfg.lowpwreq.selfrfshmask
+	 * sdr.ctrlcfg.lowpwrtiming.clkdisablecycles
+	 * sdr.ctrlcfg.dramtiming4.selfrfshexit
+	 */
+
+	.arch   armv7-a
+	.text
+	.align 3
+
+	/*
+	 * socfpga_sdram_self_refresh
+	 *
+	 *  r0 : sdr_ctl_base_addr
+	 *  r1 : temp storage of return value
+	 *  r2 : temp storage of register values
+	 *  r3 : loop counter
+	 *
+	 *  return value: lower 16 bits: loop count going into self refresh
+	 *                upper 16 bits: loop count exiting self refresh
+	 */
+ENTRY(socfpga_sdram_self_refresh)
+	/* Enable dynamic clock gating in the Power Control Register. */
+	mrc	p15, 0, r2, c15, c0, 0
+	orr	r2, r2, #1
+	mcr	p15, 0, r2, c15, c0, 0
+
+	/* Enable self refresh: set sdr.ctrlgrp.lowpwreq.selfrshreq = 1 */
+	ldr	r2, [r0, #SDR_CTRLGRP_LOWPWREQ_ADDR]
+	orr	r2, r2, #SELFRSHREQ_MASK
+	str	r2, [r0, #SDR_CTRLGRP_LOWPWREQ_ADDR]
+
+	/* Poll until sdr.ctrlgrp.lowpwrack.selfrfshack == 1 or hit max loops */
+	mov	r3, #0
+while_ack_0:
+	ldr	r2, [r0, #SDR_CTRLGRP_LOWPWRACK_ADDR]
+	and	r2, r2, #SELFRFSHACK_MASK
+	cmp	r2, #SELFRFSHACK_MASK
+	beq	ack_1
+
+	add	r3, #1
+	cmp	r3, #MAX_LOOP_COUNT
+	bne	while_ack_0
+
+ack_1:
+	mov	r1, r3
+
+	/*
+	 * Execute an ISB instruction to ensure that all of the
+	 * CP15 register changes have been committed.
+	 */
+	isb
+
+	/*
+	 * Execute a barrier instruction to ensure that all cache,
+	 * TLB and branch predictor maintenance operations issued
+	 * by any CPU in the cluster have completed.
+	 */
+	dsb
+	dmb
+
+	wfi
+
+	/* Disable self-refresh: set sdr.ctrlgrp.lowpwreq.selfrshreq = 0 */
+	ldr	r2, [r0, #SDR_CTRLGRP_LOWPWREQ_ADDR]
+	bic	r2, r2, #SELFRSHREQ_MASK
+	str	r2, [r0, #SDR_CTRLGRP_LOWPWREQ_ADDR]
+
+	/* Poll until sdr.ctrlgrp.lowpwrack.selfrfshack == 0 or hit max loops */
+	mov	r3, #0
+while_ack_1:
+	ldr	r2, [r0, #SDR_CTRLGRP_LOWPWRACK_ADDR]
+	and	r2, r2, #SELFRFSHACK_MASK
+	cmp	r2, #SELFRFSHACK_MASK
+	bne	ack_0
+
+	add	r3, #1
+	cmp	r3, #MAX_LOOP_COUNT
+	bne	while_ack_1
+
+ack_0:
+	/*
+	 * Prepare return value:
+	 * Shift loop count for exiting self refresh into upper 16 bits.
+	 * Leave loop count for requesting self refresh in lower 16 bits.
+	 */
+	mov	r3, r3, lsl #16
+	add	r1, r1, r3
+
+	/* Disable dynamic clock gating in the Power Control Register. */
+	mrc	p15, 0, r2, c15, c0, 0
+	bic	r2, r2, #1
+	mcr	p15, 0, r2, c15, c0, 0
+
+	mov     r0, r1                  @ return value
+	bx	lr			@ return
+
+ENDPROC(socfpga_sdram_self_refresh)
+ENTRY(socfpga_sdram_self_refresh_sz)
+	.word	. - socfpga_sdram_self_refresh
diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c
index a154920..19643a7 100644
--- a/arch/arm/mach-socfpga/socfpga.c
+++ b/arch/arm/mach-socfpga/socfpga.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright (C) 2012 Altera Corporation
+ *  Copyright (C) 2012-2015 Altera Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -29,6 +29,7 @@
 
 void __iomem *sys_manager_base_addr;
 void __iomem *rst_manager_base_addr;
+void __iomem *sdr_ctl_base_addr;
 unsigned long socfpga_cpu1start_addr;
 
 void __init socfpga_sysmgr_init(void)
@@ -49,6 +50,9 @@ void __init socfpga_sysmgr_init(void)
 
 	np = of_find_compatible_node(NULL, NULL, "altr,rst-mgr");
 	rst_manager_base_addr = of_iomap(np, 0);
+
+	np = of_find_compatible_node(NULL, NULL, "altr,sdr-ctl");
+	sdr_ctl_base_addr = of_iomap(np, 0);
 }
 
 static void __init socfpga_init_irq(void)
diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index 3c4929f..806b63b 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -388,6 +388,23 @@ static int altr_sdram_remove(struct platform_device *pdev)
 	return 0;
 }
 
+/*
+ * If you want to suspend, need to disable EDAC by removing it
+ * from the device tree or defconfig.
+ */
+#ifdef CONFIG_PM
+static int altr_sdram_prepare(struct device *dev)
+{
+	pr_err("Suspend not allowed when EDAC is enabled.\n");
+
+	return -EPERM;
+}
+
+const struct dev_pm_ops altr_sdram_pm_ops = {
+	.prepare = altr_sdram_prepare,
+};
+#endif
+
 static const struct of_device_id altr_sdram_ctrl_of_match[] = {
 	{ .compatible = "altr,sdram-edac", },
 	{},
@@ -399,6 +416,9 @@ static struct platform_driver altr_sdram_edac_driver = {
 	.remove = altr_sdram_remove,
 	.driver = {
 		.name = "altr_sdram_edac",
+#ifdef CONFIG_PM
+		.pm = &altr_sdram_pm_ops,
+#endif
 		.of_match_table = altr_sdram_ctrl_of_match,
 	},
 };
-- 
1.7.9.5

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Re: [PATCHv5 1/2] ARM: socfpga: support suspend to ram

[Dinh Nguyen]

On 5/28/15 4:19 PM, Alan Tull wrote:
> Add code that requests that the sdr controller go into
> self-refresh mode.  This code is run from ocram.
> 
> Suspend-to-RAM and EDAC support are mutually exclusive on
> SOCFPGA.  If the EDAC is enabled, it will prevent the
> platform from going into suspend.
> 
> Example of how to request to suspend to ram:
>  $ echo enabled > \
> /sys/devices/soc/ffc02000.serial0/tty/ttyS0/power/wakeup
> 
>  $ echo -n mem > /sys/power/state
> 
> Signed-off-by: Alan Tull <atull@opensource.altera.com>
> Cc: Pavel Machek <pavel@denx.de>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
> Cc: Steffen Trumtrar <s.trumtrar@pengutronix.de>
> ---
> v2: use Generic on-chip SRAM driver to allocate ocram
>     rm fncpy_align since generic allocator handles alignment
>     check __arm_ioremap_exec return code
>     check for NULL pointers
>     add a comment regarding sdram controller configuration
> v3: fix renamed #define
>     propagate socfpga_setup_ocram_self_refresh error code
> v4: Kconfig: don't need to select GENERIC_ALLOCATER
>     add CONFIG_SOCFPGA_SUSPEND
>     make s2r and EDAC support mutually exclusive
>     socfpga.c: add sdr_ctl_base_addr
>     return error if ocram not available in device tree
>     update copyright years
> v5: remove compile time dependency
>     edac driver will prevent suspend
>     don't configure scu standby mode; done in enable_scu().
>     fix comments about required sdram controller configuration
> ---
>  arch/arm/mach-socfpga/Kconfig        |   10 ++-
>  arch/arm/mach-socfpga/Makefile       |    1 +
>  arch/arm/mach-socfpga/core.h         |    6 +-
>  arch/arm/mach-socfpga/pm.c           |  149 ++++++++++++++++++++++++++++++++++
>  arch/arm/mach-socfpga/self-refresh.S |  136 +++++++++++++++++++++++++++++++
>  arch/arm/mach-socfpga/socfpga.c      |    6 +-
>  drivers/edac/altera_edac.c           |   20 +++++
>  7 files changed, 325 insertions(+), 3 deletions(-)
>  create mode 100644 arch/arm/mach-socfpga/pm.c
>  create mode 100644 arch/arm/mach-socfpga/self-refresh.S
> 

Which branch are you basing this patch on? I got a trivial patch
conflict in Kconfig when I applied to arm-soc/for-next and v4.1-rc5.

Also, I'm getting these sparse warnings:

arch/arm/mach-socfpga/pm.c:86:25: warning: incorrect type in argument 1
(different address spaces)
arch/arm/mach-socfpga/pm.c:86:25:    expected void *<noident>
arch/arm/mach-socfpga/pm.c:86:25:    got void [noderef]
<asn:2>*[assigned] suspend_ocram_base
arch/arm/mach-socfpga/pm.c:108:52: warning: cast removes address space
of expression

Dinh

Re: [PATCHv5 1/2] ARM: socfpga: support suspend to ram

[atull]

On Fri, 29 May 2015, Dinh Nguyen wrote:

> 
> 
> On 5/28/15 4:19 PM, Alan Tull wrote:
> > Add code that requests that the sdr controller go into
> > self-refresh mode.  This code is run from ocram.
> > 
> > Suspend-to-RAM and EDAC support are mutually exclusive on
> > SOCFPGA.  If the EDAC is enabled, it will prevent the
> > platform from going into suspend.
> > 
> > Example of how to request to suspend to ram:
> >  $ echo enabled > \
> > /sys/devices/soc/ffc02000.serial0/tty/ttyS0/power/wakeup
> > 
> >  $ echo -n mem > /sys/power/state
> > 
> > Signed-off-by: Alan Tull <atull-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org>
> > Cc: Pavel Machek <pavel-ynQEQJNshbs@public.gmane.org>
> > Cc: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
> > Cc: Dinh Nguyen <dinguyen-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org>
> > Cc: Steffen Trumtrar <s.trumtrar-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
> > ---
> > v2: use Generic on-chip SRAM driver to allocate ocram
> >     rm fncpy_align since generic allocator handles alignment
> >     check __arm_ioremap_exec return code
> >     check for NULL pointers
> >     add a comment regarding sdram controller configuration
> > v3: fix renamed #define
> >     propagate socfpga_setup_ocram_self_refresh error code
> > v4: Kconfig: don't need to select GENERIC_ALLOCATER
> >     add CONFIG_SOCFPGA_SUSPEND
> >     make s2r and EDAC support mutually exclusive
> >     socfpga.c: add sdr_ctl_base_addr
> >     return error if ocram not available in device tree
> >     update copyright years
> > v5: remove compile time dependency
> >     edac driver will prevent suspend
> >     don't configure scu standby mode; done in enable_scu().
> >     fix comments about required sdram controller configuration
> > ---
> >  arch/arm/mach-socfpga/Kconfig        |   10 ++-
> >  arch/arm/mach-socfpga/Makefile       |    1 +
> >  arch/arm/mach-socfpga/core.h         |    6 +-
> >  arch/arm/mach-socfpga/pm.c           |  149 ++++++++++++++++++++++++++++++++++
> >  arch/arm/mach-socfpga/self-refresh.S |  136 +++++++++++++++++++++++++++++++
> >  arch/arm/mach-socfpga/socfpga.c      |    6 +-
> >  drivers/edac/altera_edac.c           |   20 +++++
> >  7 files changed, 325 insertions(+), 3 deletions(-)
> >  create mode 100644 arch/arm/mach-socfpga/pm.c
> >  create mode 100644 arch/arm/mach-socfpga/self-refresh.S
> > 
> 
> Which branch are you basing this patch on? I got a trivial patch
> conflict in Kconfig when I applied to arm-soc/for-next and v4.1-rc5.

Based on your socfpga_for_next_arria10 branch from 
git://git.kernel.org/pub/scm/linux/kernel/git/dinguyen/linux.git

> 
> Also, I'm getting these sparse warnings:
> 
> arch/arm/mach-socfpga/pm.c:86:25: warning: incorrect type in argument 1
> (different address spaces)
> arch/arm/mach-socfpga/pm.c:86:25:    expected void *<noident>
> arch/arm/mach-socfpga/pm.c:86:25:    got void [noderef]
> <asn:2>*[assigned] suspend_ocram_base
> arch/arm/mach-socfpga/pm.c:108:52: warning: cast removes address space
> of expression
> 
> Dinh
> 

It appears to want suspend_ocram_base to be void * instead of void 
__iomem *.

Alan
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Re: [PATCHv5 1/2] ARM: socfpga: support suspend to ram

[atull]

On Fri, 29 May 2015, Dinh Nguyen wrote:

> 
> 
> On 5/28/15 4:19 PM, Alan Tull wrote:
> > Add code that requests that the sdr controller go into
> > self-refresh mode.  This code is run from ocram.
> > 
> > Suspend-to-RAM and EDAC support are mutually exclusive on
> > SOCFPGA.  If the EDAC is enabled, it will prevent the
> > platform from going into suspend.
> > 
> > Example of how to request to suspend to ram:
> >  $ echo enabled > \
> > /sys/devices/soc/ffc02000.serial0/tty/ttyS0/power/wakeup
> > 
> >  $ echo -n mem > /sys/power/state
> > 
> > Signed-off-by: Alan Tull <atull-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org>
> > Cc: Pavel Machek <pavel-ynQEQJNshbs@public.gmane.org>
> > Cc: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
> > Cc: Dinh Nguyen <dinguyen-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org>
> > Cc: Steffen Trumtrar <s.trumtrar-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
> > ---
> > v2: use Generic on-chip SRAM driver to allocate ocram
> >     rm fncpy_align since generic allocator handles alignment
> >     check __arm_ioremap_exec return code
> >     check for NULL pointers
> >     add a comment regarding sdram controller configuration
> > v3: fix renamed #define
> >     propagate socfpga_setup_ocram_self_refresh error code
> > v4: Kconfig: don't need to select GENERIC_ALLOCATER
> >     add CONFIG_SOCFPGA_SUSPEND
> >     make s2r and EDAC support mutually exclusive
> >     socfpga.c: add sdr_ctl_base_addr
> >     return error if ocram not available in device tree
> >     update copyright years
> > v5: remove compile time dependency
> >     edac driver will prevent suspend
> >     don't configure scu standby mode; done in enable_scu().
> >     fix comments about required sdram controller configuration
> > ---
> >  arch/arm/mach-socfpga/Kconfig        |   10 ++-
> >  arch/arm/mach-socfpga/Makefile       |    1 +
> >  arch/arm/mach-socfpga/core.h         |    6 +-
> >  arch/arm/mach-socfpga/pm.c           |  149 ++++++++++++++++++++++++++++++++++
> >  arch/arm/mach-socfpga/self-refresh.S |  136 +++++++++++++++++++++++++++++++
> >  arch/arm/mach-socfpga/socfpga.c      |    6 +-
> >  drivers/edac/altera_edac.c           |   20 +++++
> >  7 files changed, 325 insertions(+), 3 deletions(-)
> >  create mode 100644 arch/arm/mach-socfpga/pm.c
> >  create mode 100644 arch/arm/mach-socfpga/self-refresh.S
> > 
> 
> Which branch are you basing this patch on? I got a trivial patch
> conflict in Kconfig when I applied to arm-soc/for-next and v4.1-rc5.
> 
> Also, I'm getting these sparse warnings:
> 
> arch/arm/mach-socfpga/pm.c:86:25: warning: incorrect type in argument 1
> (different address spaces)
> arch/arm/mach-socfpga/pm.c:86:25:    expected void *<noident>
> arch/arm/mach-socfpga/pm.c:86:25:    got void [noderef]
> <asn:2>*[assigned] suspend_ocram_base
> arch/arm/mach-socfpga/pm.c:108:52: warning: cast removes address space
> of expression
> 
> Dinh
> 

The problem is that fncpy wants parameter 1 to be void* and 
__arm_ioremap_exec wants 'void __ioram *'.

I get other warnings if I declare 'void *suspend_ocram_base' or cast it as
(void *) for fncpy().  It looks like we are stuck with this warning.

However sparse kindly pointed out that I needed to fix a declaration in
altera_edac.c:

-const struct dev_pm_ops altr_sdram_pm_ops = {
+static const struct dev_pm_ops altr_sdram_pm_ops = {

I'll fix that in the next rev.

Alan
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[PATCHv5 2/2] ARM: socfpga: dts: add sdram controller dt binding doc

[Alan Tull]

Add binding doc for Altera SOCFPGA SDRAM controller.

Signed-off-by: Alan Tull <atull-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org>
---
v4: Add bindings doc
v5: No change for v5
---
 .../arm/altera/socfpga-sdram-controller.txt        |   12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/altera/socfpga-sdram-controller.txt

diff --git a/Documentation/devicetree/bindings/arm/altera/socfpga-sdram-controller.txt b/Documentation/devicetree/bindings/arm/altera/socfpga-sdram-controller.txt
new file mode 100644
index 0000000..77ca635
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/altera/socfpga-sdram-controller.txt
@@ -0,0 +1,12 @@
+Altera SOCFPGA SDRAM Controller
+
+Required properties:
+- compatible : Should contain "altr,sdr-ctl" and "syscon".
+  syscon is required by the Altera SOCFPGA SDRAM EDAC.
+- reg : Should contain 1 register range (address and length)
+
+Example:
+	sdr: sdr@ffc25000 {
+		compatible = "altr,sdr-ctl", "syscon";
+		reg = <0xffc25000 0x1000>;
+	};
-- 
1.7.9.5

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