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Message-ID: <1445943895-2466-1-git-send-email-raghav@freescale.com>
Date: Tue, 27 Oct 2015 16:34:55 +0530
From: Raghav Dogra <raghav@...escale.com>
To: <linux-kernel@...r.kernel.org>
CC: <scottwood@...escale.com>, Raghav Dogra <raghav@...escale.com>
Subject: [PATCH 1/2] drivers/memory: Add deep sleep support for IFC
Add support of suspend, resume function to support deep sleep.
Also make sure of SRAM initialization during resume.
Signed-off-by: Raghav Dogra <raghav@...escale.com>
---
drivers/memory/fsl_ifc.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/fsl_ifc.h | 6 ++++++
2 files changed, 62 insertions(+)
diff --git a/drivers/memory/fsl_ifc.c b/drivers/memory/fsl_ifc.c
index e87459f..163ccf2 100644
--- a/drivers/memory/fsl_ifc.c
+++ b/drivers/memory/fsl_ifc.c
@@ -23,6 +23,7 @@
#include <linux/kernel.h>
#include <linux/compiler.h>
#include <linux/spinlock.h>
+#include <linux/delay.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/io.h>
@@ -35,6 +36,9 @@
struct fsl_ifc_ctrl *fsl_ifc_ctrl_dev;
EXPORT_SYMBOL(fsl_ifc_ctrl_dev);
+#define FSL_IFC_V1_3_0 0x01030000
+#define IFC_TIMEOUT_MSECS 100000 /* 100ms */
+
/*
* convert_ifc_address - convert the base address
* @addr_base: base address of the memory bank
@@ -308,6 +312,53 @@ err:
return ret;
}
+#ifdef CONFIG_PM_SLEEP
+/* save ifc registers */
+static int fsl_ifc_suspend(struct device *dev)
+{
+ struct fsl_ifc_ctrl *ctrl = dev_get_drvdata(dev);
+ struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
+
+ ctrl->saved_regs = kzalloc(sizeof(struct fsl_ifc_regs), GFP_KERNEL);
+ if (!ctrl->saved_regs)
+ return -ENOMEM;
+
+ _memcpy_fromio(ctrl->saved_regs, ifc, sizeof(struct fsl_ifc_regs));
+
+ return 0;
+}
+
+/* restore ifc registers */
+static int fsl_ifc_resume(struct device *dev)
+{
+ struct fsl_ifc_ctrl *ctrl = dev_get_drvdata(dev);
+ struct fsl_ifc_regs __iomem *ifc = ctrl->regs;
+ uint32_t ver = 0, ncfgr, status;
+
+ if (ctrl->saved_regs) {
+ _memcpy_toio(ifc, ctrl->saved_regs,
+ sizeof(struct fsl_ifc_regs));
+ kfree(ctrl->saved_regs);
+ ctrl->saved_regs = NULL;
+ }
+
+ ver = in_be32(&ctrl->regs->ifc_rev);
+ ncfgr = in_be32(&ifc->ifc_nand.ncfgr);
+ if (ver >= FSL_IFC_V1_3_0) {
+ out_be32(&ifc->ifc_nand.ncfgr, ncfgr | IFC_NAND_SRAM_INIT_EN);
+
+ /* wait for SRAM_INIT bit to be clear or timeout */
+ status = spin_event_timeout(!(in_be32(&ifc->ifc_nand.ncfgr)
+ & IFC_NAND_SRAM_INIT_EN),
+ IFC_TIMEOUT_MSECS, 0);
+ if (!status)
+ dev_err(ctrl->dev, "Timeout waiting for IFC SRAM INIT");
+ }
+
+ return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
static const struct of_device_id fsl_ifc_match[] = {
{
.compatible = "fsl,ifc",
@@ -315,10 +366,15 @@ static const struct of_device_id fsl_ifc_match[] = {
{},
};
+static const struct dev_pm_ops ifc_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(fsl_ifc_suspend, fsl_ifc_resume)
+};
+
static struct platform_driver fsl_ifc_ctrl_driver = {
.driver = {
.name = "fsl-ifc",
.of_match_table = fsl_ifc_match,
+ .pm = &ifc_pm_ops,
},
.probe = fsl_ifc_ctrl_probe,
.remove = fsl_ifc_ctrl_remove,
diff --git a/include/linux/fsl_ifc.h b/include/linux/fsl_ifc.h
index 0023088..2776df2 100644
--- a/include/linux/fsl_ifc.h
+++ b/include/linux/fsl_ifc.h
@@ -270,6 +270,8 @@
*/
/* Auto Boot Mode */
#define IFC_NAND_NCFGR_BOOT 0x80000000
+/* SRAM INIT EN */
+#define IFC_NAND_SRAM_INIT_EN 0x20000000
/* Addressing Mode-ROW0+n/COL0 */
#define IFC_NAND_NCFGR_ADDR_MODE_RC0 0x00000000
/* Addressing Mode-ROW0+n/COL0+n */
@@ -841,6 +843,10 @@ struct fsl_ifc_ctrl {
u32 nand_stat;
wait_queue_head_t nand_wait;
+#ifdef CONFIG_PM_SLEEP
+ /* save regs when system go to deep-sleep */
+ struct fsl_ifc_regs *saved_regs;
+#endif
bool little_endian;
};
--
1.9.1
--
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