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Message-Id: <1398452776-28638-6-git-send-email-sre@kernel.org>
Date: Fri, 25 Apr 2014 21:06:08 +0200
From: Sebastian Reichel <sre@...nel.org>
To: Sebastian Reichel <sre@...g0.de>,
Linus Walleij <linus.walleij@...aro.org>,
Shubhrajyoti Datta <omaplinuxkernel@...il.com>,
Carlos Chinea <cch.devel@...il.com>
Cc: Tony Lindgren <tony@...mide.com>, Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
Pali Rohár <pali.rohar@...il.com>,
Ивайло Димитров
<freemangordon@....bg>,
Joni Lapilainen <joni.lapilainen@...il.com>,
Aaro Koskinen <aaro.koskinen@....fi>,
Pavel Machek <pavel@....cz>, Sebastian Reichel <sre@...nel.org>
Subject: [PATCHv4 05/13] HSI: Add channel resource support to HSI clients
Make HSI channel ids platform data, which can be provided
by platform data.
Signed-off-by: Sebastian Reichel <sre@...nel.org>
---
drivers/hsi/clients/hsi_char.c | 12 +++++------
drivers/hsi/hsi.c | 46 +++++++++++++++++++++++++++++++++++++++++-
include/linux/hsi/hsi.h | 24 ++++++++++++++++++----
3 files changed, 71 insertions(+), 11 deletions(-)
diff --git a/drivers/hsi/clients/hsi_char.c b/drivers/hsi/clients/hsi_char.c
index 3073320..57f70c2 100644
--- a/drivers/hsi/clients/hsi_char.c
+++ b/drivers/hsi/clients/hsi_char.c
@@ -367,7 +367,7 @@ static int hsc_rx_set(struct hsi_client *cl, struct hsc_rx_config *rxc)
return -EINVAL;
tmp = cl->rx_cfg;
cl->rx_cfg.mode = rxc->mode;
- cl->rx_cfg.channels = rxc->channels;
+ cl->rx_cfg.num_hw_channels = rxc->channels;
cl->rx_cfg.flow = rxc->flow;
ret = hsi_setup(cl);
if (ret < 0) {
@@ -383,7 +383,7 @@ static int hsc_rx_set(struct hsi_client *cl, struct hsc_rx_config *rxc)
static inline void hsc_rx_get(struct hsi_client *cl, struct hsc_rx_config *rxc)
{
rxc->mode = cl->rx_cfg.mode;
- rxc->channels = cl->rx_cfg.channels;
+ rxc->channels = cl->rx_cfg.num_hw_channels;
rxc->flow = cl->rx_cfg.flow;
}
@@ -402,7 +402,7 @@ static int hsc_tx_set(struct hsi_client *cl, struct hsc_tx_config *txc)
return -EINVAL;
tmp = cl->tx_cfg;
cl->tx_cfg.mode = txc->mode;
- cl->tx_cfg.channels = txc->channels;
+ cl->tx_cfg.num_hw_channels = txc->channels;
cl->tx_cfg.speed = txc->speed;
cl->tx_cfg.arb_mode = txc->arb_mode;
ret = hsi_setup(cl);
@@ -417,7 +417,7 @@ static int hsc_tx_set(struct hsi_client *cl, struct hsc_tx_config *txc)
static inline void hsc_tx_get(struct hsi_client *cl, struct hsc_tx_config *txc)
{
txc->mode = cl->tx_cfg.mode;
- txc->channels = cl->tx_cfg.channels;
+ txc->channels = cl->tx_cfg.num_hw_channels;
txc->speed = cl->tx_cfg.speed;
txc->arb_mode = cl->tx_cfg.arb_mode;
}
@@ -435,7 +435,7 @@ static ssize_t hsc_read(struct file *file, char __user *buf, size_t len,
return -EINVAL;
if (len > max_data_size)
len = max_data_size;
- if (channel->ch >= channel->cl->rx_cfg.channels)
+ if (channel->ch >= channel->cl->rx_cfg.num_hw_channels)
return -ECHRNG;
if (test_and_set_bit(HSC_CH_READ, &channel->flags))
return -EBUSY;
@@ -492,7 +492,7 @@ static ssize_t hsc_write(struct file *file, const char __user *buf, size_t len,
return -EINVAL;
if (len > max_data_size)
len = max_data_size;
- if (channel->ch >= channel->cl->tx_cfg.channels)
+ if (channel->ch >= channel->cl->tx_cfg.num_hw_channels)
return -ECHRNG;
if (test_and_set_bit(HSC_CH_WRITE, &channel->flags))
return -EBUSY;
diff --git a/drivers/hsi/hsi.c b/drivers/hsi/hsi.c
index e96a987..de2ad8f 100644
--- a/drivers/hsi/hsi.c
+++ b/drivers/hsi/hsi.c
@@ -62,18 +62,36 @@ static struct bus_type hsi_bus_type = {
static void hsi_client_release(struct device *dev)
{
- kfree(to_hsi_client(dev));
+ struct hsi_client *cl = to_hsi_client(dev);
+
+ kfree(cl->tx_cfg.channels);
+ kfree(cl->rx_cfg.channels);
+ kfree(cl);
}
static void hsi_new_client(struct hsi_port *port, struct hsi_board_info *info)
{
struct hsi_client *cl;
+ size_t size;
cl = kzalloc(sizeof(*cl), GFP_KERNEL);
if (!cl)
return;
+
cl->tx_cfg = info->tx_cfg;
+ if (cl->tx_cfg.channels) {
+ size = cl->tx_cfg.num_channels * sizeof(*cl->tx_cfg.channels);
+ cl->tx_cfg.channels = kzalloc(size , GFP_KERNEL);
+ memcpy(cl->tx_cfg.channels, info->tx_cfg.channels, size);
+ }
+
cl->rx_cfg = info->rx_cfg;
+ if (cl->rx_cfg.channels) {
+ size = cl->rx_cfg.num_channels * sizeof(*cl->rx_cfg.channels);
+ cl->rx_cfg.channels = kzalloc(size , GFP_KERNEL);
+ memcpy(cl->rx_cfg.channels, info->rx_cfg.channels, size);
+ }
+
cl->device.bus = &hsi_bus_type;
cl->device.parent = &port->device;
cl->device.release = hsi_client_release;
@@ -502,6 +520,32 @@ int hsi_event(struct hsi_port *port, unsigned long event)
}
EXPORT_SYMBOL_GPL(hsi_event);
+/**
+ * hsi_get_channel_id_by_name - acquire channel id by channel name
+ * @cl: HSI client, which uses the channel
+ * @name: name the channel is known under
+ *
+ * Clients can call this function to get the hsi channel ids similar to
+ * requesting IRQs or GPIOs by name. This function assumes the same
+ * channel configuration is used for RX and TX.
+ *
+ * Returns -errno on error or channel id on success.
+ */
+int hsi_get_channel_id_by_name(struct hsi_client *cl, char *name)
+{
+ int i;
+
+ if (!cl->rx_cfg.channels)
+ return -ENOENT;
+
+ for (i = 0; i < cl->rx_cfg.num_channels; i++)
+ if (!strcmp(cl->rx_cfg.channels[i].name, name))
+ return cl->rx_cfg.channels[i].id;
+
+ return -ENXIO;
+}
+EXPORT_SYMBOL_GPL(hsi_get_channel_id_by_name);
+
static int __init hsi_init(void)
{
return bus_register(&hsi_bus_type);
diff --git a/include/linux/hsi/hsi.h b/include/linux/hsi/hsi.h
index 5a9f121..e3cff94 100644
--- a/include/linux/hsi/hsi.h
+++ b/include/linux/hsi/hsi.h
@@ -68,17 +68,31 @@ enum {
};
/**
+ * struct hsi_channel - channel resource used by the hsi clients
+ * @id: Channel number
+ * @name: Channel name
+ */
+struct hsi_channel {
+ unsigned int id;
+ const char *name;
+};
+
+/**
* struct hsi_config - Configuration for RX/TX HSI modules
* @mode: Bit transmission mode (STREAM or FRAME)
- * @channels: Number of channels to use [1..16]
+ * @channels: Channel resources used by the client
+ * @num_channels: Number of channel resources
+ * @num_hw_channels: Number of channels the transceiver is configured for [1..16]
* @speed: Max bit transmission speed (Kbit/s)
* @flow: RX flow type (SYNCHRONIZED or PIPELINE)
* @arb_mode: Arbitration mode for TX frame (Round robin, priority)
*/
struct hsi_config {
- unsigned int mode;
- unsigned int channels;
- unsigned int speed;
+ unsigned int mode;
+ struct hsi_channel *channels;
+ unsigned int num_channels;
+ unsigned int num_hw_channels;
+ unsigned int speed;
union {
unsigned int flow; /* RX only */
unsigned int arb_mode; /* TX only */
@@ -306,6 +320,8 @@ static inline struct hsi_port *hsi_find_port_num(struct hsi_controller *hsi,
*/
int hsi_async(struct hsi_client *cl, struct hsi_msg *msg);
+int hsi_get_channel_id_by_name(struct hsi_client *cl, char *name);
+
/**
* hsi_id - Get HSI controller ID associated to a client
* @cl: Pointer to a HSI client
--
1.9.2
--
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