Add D_CAN raminit support to C_CAN driver to enable D_CAN RAM.
DCAN RAM holds all the message objects during transmission or
receiving of data. This initialization/de-initialization should
be done in synchronous with D_CAN clock.
Signed-off-by: AnilKumar Ch <anilku...@ti.com>
---
drivers/net/can/c_can/c_can.c | 13 ++++++++++++
drivers/net/can/c_can/c_can.h | 2 ++
drivers/net/can/c_can/c_can_platform.c | 10 +++++++++
include/linux/can/platform/c_can.h | 36 ++++++++++++++++++++++++++++++++
4 files changed, 61 insertions(+)
create mode 100644 include/linux/can/platform/c_can.h
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index aa6c5eb..c175410 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -214,6 +214,12 @@ static inline void c_can_pm_runtime_put_sync(const struct
c_can_priv *priv)
pm_runtime_put_sync(priv->device);
}
+static inline void c_can_reset_ram(const struct c_can_priv *priv, bool enable)
+{
+ if (priv->ram_init)
+ priv->ram_init(priv->instance, enable);
+}
+
static inline int get_tx_next_msg_obj(const struct c_can_priv *priv)
{
return (priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) +
@@ -1071,6 +1077,8 @@ static int c_can_open(struct net_device *dev)
struct c_can_priv *priv = netdev_priv(dev);
c_can_pm_runtime_get_sync(priv);
+ /* Initialize DCAN RAM */
+ c_can_reset_ram(priv, true);
/* open the can device */
err = open_candev(dev);
@@ -1099,6 +1107,8 @@ static int c_can_open(struct net_device *dev)
exit_irq_fail:
close_candev(dev);
exit_open_fail:
+ /* De-Initialize DCAN RAM */
+ c_can_reset_ram(priv, false);
c_can_pm_runtime_put_sync(priv);
return err;
}
@@ -1112,6 +1122,9 @@ static int c_can_close(struct net_device *dev)
c_can_stop(dev);
free_irq(dev->irq, dev);
close_candev(dev);
+
+ /* De-Initialize DCAN RAM */
+ c_can_reset_ram(priv, false);
c_can_pm_runtime_put_sync(priv);
return 0;
diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index 1437a6d..5f6339c 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -166,6 +166,8 @@ struct c_can_priv {
unsigned int tx_echo;
void *priv; /* for board-specific data */
u16 irqstatus;
+ unsigned int instance;
+ void (*ram_init) (unsigned int instance, bool enable);
};
struct net_device *alloc_c_can_dev(void);
diff --git a/drivers/net/can/c_can/c_can_platform.c
b/drivers/net/can/c_can/c_can_platform.c
index c351975..c6963b2 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -34,6 +34,7 @@
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/can/platform/c_can.h>
#include <linux/can/dev.h>
@@ -98,6 +99,7 @@ static int __devinit c_can_plat_probe(struct platform_device
*pdev)
struct net_device *dev;
struct c_can_priv *priv;
const struct of_device_id *match;
+ struct c_can_platform_data *pdata = NULL;
const struct platform_device_id *id;
struct pinctrl *pinctrl;
struct resource *mem;
@@ -179,6 +181,14 @@ static int __devinit c_can_plat_probe(struct
platform_device *pdev)
priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
priv->read_reg = c_can_plat_read_reg_aligned_to_16bit;
priv->write_reg = c_can_plat_write_reg_aligned_to_16bit;
+ pdata = pdev->dev.platform_data;
+ if (!pdata) {
+ dev_err(&pdev->dev, "d_can platform data missing\n");
+ ret = -EINVAL;
+ goto exit_free_device;
+ }
+ priv->ram_init = pdata->ram_init;
+ priv->instance = pdata->instance;
break;
default:
ret = -EINVAL;
diff --git a/include/linux/can/platform/c_can.h
b/include/linux/can/platform/c_can.h
new file mode 100644
index 0000000..84b27d2
--- /dev/null
+++ b/include/linux/can/platform/c_can.h
@@ -0,0 +1,36 @@
+/*
+ * C_CAN controller driver platform header
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Bosch C_CAN/D_CAN controller is compliant to CAN protocol version 2.0
+ * part A and B.
+ *
+ * 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 the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __CAN_PLATFORM_C_CAN_H__
+#define __CAN_PLATFORM_C_CAN_H__
+
+/**
+ * struct c_can_platform_data - C_CAN/D_CAN Platform Data
+ *
+ * @instance: CAN instance, required for d_can raminit
+ * @ram_init: CAN RAM initialization
+ *
+ * Platform data structure to get all platform specific settings.
+ * this structure also accounts the fact that the IP may have different
+ * RAM for different SOC's
+ */
+struct c_can_platform_data {
+ unsigned int instance;
+ void (*ram_init) (unsigned int instance, bool enable);
+};
+#endif
--
1.7.9.5
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