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Message-ID: <20241115132631.264609-7-bastien.curutchet@bootlin.com>
Date: Fri, 15 Nov 2024 14:26:27 +0100
From: Bastien Curutchet <bastien.curutchet@...tlin.com>
To: Santosh Shilimkar <ssantosh@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Richard Weinberger <richard@....at>,
Vignesh Raghavendra <vigneshr@...com>
Cc: linux-kernel@...r.kernel.org,
linux-mtd@...ts.infradead.org,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Herve Codina <herve.codina@...tlin.com>,
Christopher Cordahi <christophercordahi@...ometrics.ca>,
Bastien Curutchet <bastien.curutchet@...tlin.com>
Subject: [PATCH v4 06/10] memory: ti-aemif: Export aemif_*_cs_timings()
Export the aemif_set_cs_timing() and aemif_check_cs_timing() symbols so
they can be used by other drivers
Add a mutex to protect the CS configuration register from concurrent
accesses between the AEMIF and its 'children'.
Signed-off-by: Bastien Curutchet <bastien.curutchet@...tlin.com>
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
drivers/memory/ti-aemif.c | 35 ++++++++++++---------------------
include/linux/memory/ti-aemif.h | 32 ++++++++++++++++++++++++++++++
2 files changed, 45 insertions(+), 22 deletions(-)
create mode 100644 include/linux/memory/ti-aemif.h
diff --git a/drivers/memory/ti-aemif.c b/drivers/memory/ti-aemif.c
index dae3441e0cd9..519283028eee 100644
--- a/drivers/memory/ti-aemif.c
+++ b/drivers/memory/ti-aemif.c
@@ -13,7 +13,9 @@
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
+#include <linux/memory/ti-aemif.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
@@ -79,26 +81,6 @@
#define CONFIG_MASK (EW(EW_MAX) | SSTROBE(SSTROBE_MAX) | ASIZE_MAX)
-/**
- * struct aemif_cs_timings: structure to hold CS timings
- * @wstrobe: write strobe width, number of cycles - 1
- * @rstrobe: read strobe width, number of cycles - 1
- * @wsetup: write setup width, number of cycles - 1
- * @whold: write hold width, number of cycles - 1
- * @rsetup: read setup width, number of cycles - 1
- * @rhold: read hold width, number of cycles - 1
- * @ta: minimum turn around time, number of cycles - 1
- */
-struct aemif_cs_timings {
- u32 wstrobe;
- u32 rstrobe;
- u32 wsetup;
- u32 whold;
- u32 rsetup;
- u32 rhold;
- u32 ta;
-};
-
/**
* struct aemif_cs_data: structure to hold CS parameters
* @timings: timings configuration
@@ -123,6 +105,7 @@ struct aemif_cs_data {
* @num_cs: number of assigned chip-selects
* @cs_offset: start number of cs nodes
* @cs_data: array of chip-select settings
+ * @config_cs_lock: lock used to access CS configuration
*/
struct aemif_device {
void __iomem *base;
@@ -131,6 +114,7 @@ struct aemif_device {
u8 num_cs;
int cs_offset;
struct aemif_cs_data cs_data[NUM_CS];
+ struct mutex config_cs_lock;
};
/**
@@ -139,7 +123,7 @@ struct aemif_device {
*
* @return: 0 if the timing configuration is valid, negative error number otherwise.
*/
-static int aemif_check_cs_timings(struct aemif_cs_timings *timings)
+int aemif_check_cs_timings(struct aemif_cs_timings *timings)
{
if (timings->ta > TA_MAX)
return -EINVAL;
@@ -164,6 +148,7 @@ static int aemif_check_cs_timings(struct aemif_cs_timings *timings)
return 0;
}
+EXPORT_SYMBOL(aemif_check_cs_timings);
/**
* aemif_set_cs_timings - Set the timing configuration of a given chip select.
@@ -173,7 +158,7 @@ static int aemif_check_cs_timings(struct aemif_cs_timings *timings)
*
* @return: 0 on success, else negative errno.
*/
-static int aemif_set_cs_timings(struct aemif_device *aemif, u8 cs, struct aemif_cs_timings *timings)
+int aemif_set_cs_timings(struct aemif_device *aemif, u8 cs, struct aemif_cs_timings *timings)
{
unsigned int offset;
u32 val, set;
@@ -195,13 +180,16 @@ static int aemif_set_cs_timings(struct aemif_device *aemif, u8 cs, struct aemif_
offset = A1CR_OFFSET + cs * 4;
+ mutex_lock(&aemif->config_cs_lock);
val = readl(aemif->base + offset);
val &= ~TIMINGS_MASK;
val |= set;
writel(val, aemif->base + offset);
+ mutex_unlock(&aemif->config_cs_lock);
return 0;
}
+EXPORT_SYMBOL(aemif_set_cs_timings);
/**
* aemif_calc_rate - calculate timing data.
@@ -257,10 +245,12 @@ static int aemif_config_abus(struct platform_device *pdev, int csnum)
if (data->enable_ss)
set |= ACR_SSTROBE_MASK;
+ mutex_lock(&aemif->config_cs_lock);
val = readl(aemif->base + offset);
val &= ~CONFIG_MASK;
val |= set;
writel(val, aemif->base + offset);
+ mutex_unlock(&aemif->config_cs_lock);
return aemif_set_cs_timings(aemif, data->cs - aemif->cs_offset, &data->timings);
}
@@ -399,6 +389,7 @@ static int aemif_probe(struct platform_device *pdev)
if (IS_ERR(aemif->base))
return PTR_ERR(aemif->base);
+ mutex_init(&aemif->config_cs_lock);
if (np) {
/*
* For every controller device node, there is a cs device node
diff --git a/include/linux/memory/ti-aemif.h b/include/linux/memory/ti-aemif.h
new file mode 100644
index 000000000000..0640d30f6321
--- /dev/null
+++ b/include/linux/memory/ti-aemif.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __TI_AEMIF_H
+#define __TI_AEMIF_H
+
+/**
+ * struct aemif_cs_timings: structure to hold CS timing configuration
+ * values are expressed in number of clock cycles - 1
+ * @ta: minimum turn around time
+ * @rhold: read hold width
+ * @rstrobe: read strobe width
+ * @rsetup: read setup width
+ * @whold: write hold width
+ * @wstrobe: write strobe width
+ * @wsetup: write setup width
+ */
+struct aemif_cs_timings {
+ u32 ta;
+ u32 rhold;
+ u32 rstrobe;
+ u32 rsetup;
+ u32 whold;
+ u32 wstrobe;
+ u32 wsetup;
+};
+
+struct aemif_device;
+
+int aemif_set_cs_timings(struct aemif_device *aemif, u8 cs, struct aemif_cs_timings *timings);
+int aemif_check_cs_timings(struct aemif_cs_timings *timings);
+
+#endif // __TI_AEMIF_H
--
2.47.0
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