HSI: hsi: Introducing HSI framework
Adds HSI framework in to the linux kernel. High Speed Synchronous Serial Interface (HSI) is a serial interface mainly used for connecting application engines (APE) with cellular modem engines (CMT) in cellular handsets. HSI provides multiplexing for up to 16 logical channels, low-latency and full duplex communication. Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com> Acked-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Carlos Chinea
parent
805a6af8db
commit
a056ab8c7a
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@ -52,6 +52,8 @@ source "drivers/i2c/Kconfig"
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source "drivers/spi/Kconfig"
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source "drivers/spi/Kconfig"
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source "drivers/hsi/Kconfig"
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source "drivers/pps/Kconfig"
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source "drivers/pps/Kconfig"
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source "drivers/ptp/Kconfig"
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source "drivers/ptp/Kconfig"
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@ -53,6 +53,7 @@ obj-$(CONFIG_ATA) += ata/
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obj-$(CONFIG_TARGET_CORE) += target/
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obj-$(CONFIG_TARGET_CORE) += target/
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obj-$(CONFIG_MTD) += mtd/
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obj-$(CONFIG_MTD) += mtd/
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obj-$(CONFIG_SPI) += spi/
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obj-$(CONFIG_SPI) += spi/
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obj-y += hsi/
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obj-y += net/
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obj-y += net/
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obj-$(CONFIG_ATM) += atm/
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obj-$(CONFIG_ATM) += atm/
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obj-$(CONFIG_FUSION) += message/
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obj-$(CONFIG_FUSION) += message/
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@ -0,0 +1,17 @@
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#
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# HSI driver configuration
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#
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menuconfig HSI
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tristate "HSI support"
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---help---
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The "High speed synchronous Serial Interface" is
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synchronous serial interface used mainly to connect
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application engines and cellular modems.
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if HSI
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config HSI_BOARDINFO
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bool
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default y
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endif # HSI
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@ -0,0 +1,5 @@
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#
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# Makefile for HSI
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#
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obj-$(CONFIG_HSI_BOARDINFO) += hsi_boardinfo.o
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obj-$(CONFIG_HSI) += hsi.o
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@ -0,0 +1,494 @@
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/*
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* HSI core.
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*
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* Copyright (C) 2010 Nokia Corporation. All rights reserved.
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*
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* Contact: Carlos Chinea <carlos.chinea@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/hsi/hsi.h>
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#include <linux/compiler.h>
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#include <linux/rwsem.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/kobject.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include "hsi_core.h"
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static struct device_type hsi_ctrl = {
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.name = "hsi_controller",
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};
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static struct device_type hsi_cl = {
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.name = "hsi_client",
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};
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static struct device_type hsi_port = {
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.name = "hsi_port",
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};
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static ssize_t modalias_show(struct device *dev,
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struct device_attribute *a __maybe_unused, char *buf)
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{
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return sprintf(buf, "hsi:%s\n", dev_name(dev));
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}
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static struct device_attribute hsi_bus_dev_attrs[] = {
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__ATTR_RO(modalias),
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__ATTR_NULL,
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};
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static int hsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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if (dev->type == &hsi_cl)
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add_uevent_var(env, "MODALIAS=hsi:%s", dev_name(dev));
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return 0;
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}
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static int hsi_bus_match(struct device *dev, struct device_driver *driver)
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{
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return strcmp(dev_name(dev), driver->name) == 0;
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}
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static struct bus_type hsi_bus_type = {
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.name = "hsi",
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.dev_attrs = hsi_bus_dev_attrs,
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.match = hsi_bus_match,
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.uevent = hsi_bus_uevent,
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};
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static void hsi_client_release(struct device *dev)
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{
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kfree(to_hsi_client(dev));
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}
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static void hsi_new_client(struct hsi_port *port, struct hsi_board_info *info)
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{
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struct hsi_client *cl;
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unsigned long flags;
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cl = kzalloc(sizeof(*cl), GFP_KERNEL);
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if (!cl)
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return;
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cl->device.type = &hsi_cl;
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cl->tx_cfg = info->tx_cfg;
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cl->rx_cfg = info->rx_cfg;
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cl->device.bus = &hsi_bus_type;
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cl->device.parent = &port->device;
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cl->device.release = hsi_client_release;
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dev_set_name(&cl->device, info->name);
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cl->device.platform_data = info->platform_data;
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spin_lock_irqsave(&port->clock, flags);
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list_add_tail(&cl->link, &port->clients);
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spin_unlock_irqrestore(&port->clock, flags);
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if (info->archdata)
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cl->device.archdata = *info->archdata;
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if (device_register(&cl->device) < 0) {
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pr_err("hsi: failed to register client: %s\n", info->name);
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kfree(cl);
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}
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}
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static void hsi_scan_board_info(struct hsi_controller *hsi)
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{
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struct hsi_cl_info *cl_info;
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struct hsi_port *p;
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list_for_each_entry(cl_info, &hsi_board_list, list)
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if (cl_info->info.hsi_id == hsi->id) {
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p = hsi_find_port_num(hsi, cl_info->info.port);
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if (!p)
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continue;
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hsi_new_client(p, &cl_info->info);
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}
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}
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static int hsi_remove_client(struct device *dev, void *data __maybe_unused)
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{
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struct hsi_client *cl = to_hsi_client(dev);
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struct hsi_port *port = to_hsi_port(dev->parent);
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unsigned long flags;
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spin_lock_irqsave(&port->clock, flags);
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list_del(&cl->link);
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spin_unlock_irqrestore(&port->clock, flags);
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device_unregister(dev);
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return 0;
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}
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static int hsi_remove_port(struct device *dev, void *data __maybe_unused)
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{
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device_for_each_child(dev, NULL, hsi_remove_client);
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device_unregister(dev);
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return 0;
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}
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static void hsi_controller_release(struct device *dev __maybe_unused)
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{
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}
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static void hsi_port_release(struct device *dev __maybe_unused)
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{
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}
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/**
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* hsi_unregister_controller - Unregister an HSI controller
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* @hsi: The HSI controller to register
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*/
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void hsi_unregister_controller(struct hsi_controller *hsi)
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{
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device_for_each_child(&hsi->device, NULL, hsi_remove_port);
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device_unregister(&hsi->device);
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}
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EXPORT_SYMBOL_GPL(hsi_unregister_controller);
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/**
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* hsi_register_controller - Register an HSI controller and its ports
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* @hsi: The HSI controller to register
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*
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* Returns -errno on failure, 0 on success.
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*/
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int hsi_register_controller(struct hsi_controller *hsi)
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{
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unsigned int i;
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int err;
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hsi->device.type = &hsi_ctrl;
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hsi->device.bus = &hsi_bus_type;
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hsi->device.release = hsi_controller_release;
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err = device_register(&hsi->device);
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if (err < 0)
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return err;
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for (i = 0; i < hsi->num_ports; i++) {
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hsi->port[i].device.parent = &hsi->device;
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hsi->port[i].device.bus = &hsi_bus_type;
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hsi->port[i].device.release = hsi_port_release;
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hsi->port[i].device.type = &hsi_port;
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INIT_LIST_HEAD(&hsi->port[i].clients);
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spin_lock_init(&hsi->port[i].clock);
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err = device_register(&hsi->port[i].device);
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if (err < 0)
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goto out;
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}
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/* Populate HSI bus with HSI clients */
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hsi_scan_board_info(hsi);
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return 0;
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out:
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hsi_unregister_controller(hsi);
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return err;
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}
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EXPORT_SYMBOL_GPL(hsi_register_controller);
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/**
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* hsi_register_client_driver - Register an HSI client to the HSI bus
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* @drv: HSI client driver to register
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*
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* Returns -errno on failure, 0 on success.
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*/
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int hsi_register_client_driver(struct hsi_client_driver *drv)
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{
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drv->driver.bus = &hsi_bus_type;
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(hsi_register_client_driver);
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static inline int hsi_dummy_msg(struct hsi_msg *msg __maybe_unused)
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{
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return 0;
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}
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static inline int hsi_dummy_cl(struct hsi_client *cl __maybe_unused)
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{
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return 0;
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}
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/**
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* hsi_alloc_controller - Allocate an HSI controller and its ports
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* @n_ports: Number of ports on the HSI controller
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* @flags: Kernel allocation flags
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*
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* Return NULL on failure or a pointer to an hsi_controller on success.
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*/
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struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags)
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{
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struct hsi_controller *hsi;
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struct hsi_port *port;
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unsigned int i;
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if (!n_ports)
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return NULL;
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port = kzalloc(sizeof(*port)*n_ports, flags);
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if (!port)
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return NULL;
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hsi = kzalloc(sizeof(*hsi), flags);
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if (!hsi)
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goto out;
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for (i = 0; i < n_ports; i++) {
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dev_set_name(&port[i].device, "port%d", i);
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port[i].num = i;
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port[i].async = hsi_dummy_msg;
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port[i].setup = hsi_dummy_cl;
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port[i].flush = hsi_dummy_cl;
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port[i].start_tx = hsi_dummy_cl;
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port[i].stop_tx = hsi_dummy_cl;
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port[i].release = hsi_dummy_cl;
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mutex_init(&port[i].lock);
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}
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hsi->num_ports = n_ports;
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hsi->port = port;
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return hsi;
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out:
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kfree(port);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(hsi_alloc_controller);
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/**
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* hsi_free_controller - Free an HSI controller
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* @hsi: Pointer to HSI controller
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*/
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void hsi_free_controller(struct hsi_controller *hsi)
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{
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if (!hsi)
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return;
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kfree(hsi->port);
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kfree(hsi);
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}
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EXPORT_SYMBOL_GPL(hsi_free_controller);
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/**
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* hsi_free_msg - Free an HSI message
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* @msg: Pointer to the HSI message
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*
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* Client is responsible to free the buffers pointed by the scatterlists.
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*/
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void hsi_free_msg(struct hsi_msg *msg)
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{
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if (!msg)
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return;
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sg_free_table(&msg->sgt);
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kfree(msg);
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}
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EXPORT_SYMBOL_GPL(hsi_free_msg);
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/**
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* hsi_alloc_msg - Allocate an HSI message
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* @nents: Number of memory entries
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* @flags: Kernel allocation flags
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*
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* nents can be 0. This mainly makes sense for read transfer.
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* In that case, HSI drivers will call the complete callback when
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* there is data to be read without consuming it.
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*
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* Return NULL on failure or a pointer to an hsi_msg on success.
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*/
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struct hsi_msg *hsi_alloc_msg(unsigned int nents, gfp_t flags)
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{
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struct hsi_msg *msg;
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int err;
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msg = kzalloc(sizeof(*msg), flags);
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if (!msg)
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return NULL;
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if (!nents)
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return msg;
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err = sg_alloc_table(&msg->sgt, nents, flags);
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if (unlikely(err)) {
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kfree(msg);
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msg = NULL;
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}
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return msg;
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}
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EXPORT_SYMBOL_GPL(hsi_alloc_msg);
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/**
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* hsi_async - Submit an HSI transfer to the controller
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* @cl: HSI client sending the transfer
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* @msg: The HSI transfer passed to controller
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*
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* The HSI message must have the channel, ttype, complete and destructor
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* fields set beforehand. If nents > 0 then the client has to initialize
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* also the scatterlists to point to the buffers to write to or read from.
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*
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* HSI controllers relay on pre-allocated buffers from their clients and they
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* do not allocate buffers on their own.
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*
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* Once the HSI message transfer finishes, the HSI controller calls the
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* complete callback with the status and actual_len fields of the HSI message
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||||||
|
* updated. The complete callback can be called before returning from
|
||||||
|
* hsi_async.
|
||||||
|
*
|
||||||
|
* Returns -errno on failure or 0 on success
|
||||||
|
*/
|
||||||
|
int hsi_async(struct hsi_client *cl, struct hsi_msg *msg)
|
||||||
|
{
|
||||||
|
struct hsi_port *port = hsi_get_port(cl);
|
||||||
|
|
||||||
|
if (!hsi_port_claimed(cl))
|
||||||
|
return -EACCES;
|
||||||
|
|
||||||
|
WARN_ON_ONCE(!msg->destructor || !msg->complete);
|
||||||
|
msg->cl = cl;
|
||||||
|
|
||||||
|
return port->async(msg);
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(hsi_async);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_claim_port - Claim the HSI client's port
|
||||||
|
* @cl: HSI client that wants to claim its port
|
||||||
|
* @share: Flag to indicate if the client wants to share the port or not.
|
||||||
|
*
|
||||||
|
* Returns -errno on failure, 0 on success.
|
||||||
|
*/
|
||||||
|
int hsi_claim_port(struct hsi_client *cl, unsigned int share)
|
||||||
|
{
|
||||||
|
struct hsi_port *port = hsi_get_port(cl);
|
||||||
|
int err = 0;
|
||||||
|
|
||||||
|
mutex_lock(&port->lock);
|
||||||
|
if ((port->claimed) && (!port->shared || !share)) {
|
||||||
|
err = -EBUSY;
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
if (!try_module_get(to_hsi_controller(port->device.parent)->owner)) {
|
||||||
|
err = -ENODEV;
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
port->claimed++;
|
||||||
|
port->shared = !!share;
|
||||||
|
cl->pclaimed = 1;
|
||||||
|
out:
|
||||||
|
mutex_unlock(&port->lock);
|
||||||
|
|
||||||
|
return err;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(hsi_claim_port);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_release_port - Release the HSI client's port
|
||||||
|
* @cl: HSI client which previously claimed its port
|
||||||
|
*/
|
||||||
|
void hsi_release_port(struct hsi_client *cl)
|
||||||
|
{
|
||||||
|
struct hsi_port *port = hsi_get_port(cl);
|
||||||
|
|
||||||
|
mutex_lock(&port->lock);
|
||||||
|
/* Allow HW driver to do some cleanup */
|
||||||
|
port->release(cl);
|
||||||
|
if (cl->pclaimed)
|
||||||
|
port->claimed--;
|
||||||
|
BUG_ON(port->claimed < 0);
|
||||||
|
cl->pclaimed = 0;
|
||||||
|
if (!port->claimed)
|
||||||
|
port->shared = 0;
|
||||||
|
module_put(to_hsi_controller(port->device.parent)->owner);
|
||||||
|
mutex_unlock(&port->lock);
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(hsi_release_port);
|
||||||
|
|
||||||
|
static int hsi_start_rx(struct hsi_client *cl, void *data __maybe_unused)
|
||||||
|
{
|
||||||
|
if (cl->hsi_start_rx)
|
||||||
|
(*cl->hsi_start_rx)(cl);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int hsi_stop_rx(struct hsi_client *cl, void *data __maybe_unused)
|
||||||
|
{
|
||||||
|
if (cl->hsi_stop_rx)
|
||||||
|
(*cl->hsi_stop_rx)(cl);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int hsi_port_for_each_client(struct hsi_port *port, void *data,
|
||||||
|
int (*fn)(struct hsi_client *cl, void *data))
|
||||||
|
{
|
||||||
|
struct hsi_client *cl;
|
||||||
|
|
||||||
|
spin_lock(&port->clock);
|
||||||
|
list_for_each_entry(cl, &port->clients, link) {
|
||||||
|
spin_unlock(&port->clock);
|
||||||
|
(*fn)(cl, data);
|
||||||
|
spin_lock(&port->clock);
|
||||||
|
}
|
||||||
|
spin_unlock(&port->clock);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_event -Notifies clients about port events
|
||||||
|
* @port: Port where the event occurred
|
||||||
|
* @event: The event type
|
||||||
|
*
|
||||||
|
* Clients should not be concerned about wake line behavior. However, due
|
||||||
|
* to a race condition in HSI HW protocol, clients need to be notified
|
||||||
|
* about wake line changes, so they can implement a workaround for it.
|
||||||
|
*
|
||||||
|
* Events:
|
||||||
|
* HSI_EVENT_START_RX - Incoming wake line high
|
||||||
|
* HSI_EVENT_STOP_RX - Incoming wake line down
|
||||||
|
*/
|
||||||
|
void hsi_event(struct hsi_port *port, unsigned int event)
|
||||||
|
{
|
||||||
|
int (*fn)(struct hsi_client *cl, void *data);
|
||||||
|
|
||||||
|
switch (event) {
|
||||||
|
case HSI_EVENT_START_RX:
|
||||||
|
fn = hsi_start_rx;
|
||||||
|
break;
|
||||||
|
case HSI_EVENT_STOP_RX:
|
||||||
|
fn = hsi_stop_rx;
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
hsi_port_for_each_client(port, NULL, fn);
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(hsi_event);
|
||||||
|
|
||||||
|
static int __init hsi_init(void)
|
||||||
|
{
|
||||||
|
return bus_register(&hsi_bus_type);
|
||||||
|
}
|
||||||
|
postcore_initcall(hsi_init);
|
||||||
|
|
||||||
|
static void __exit hsi_exit(void)
|
||||||
|
{
|
||||||
|
bus_unregister(&hsi_bus_type);
|
||||||
|
}
|
||||||
|
module_exit(hsi_exit);
|
||||||
|
|
||||||
|
MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
|
||||||
|
MODULE_DESCRIPTION("High-speed Synchronous Serial Interface (HSI) framework");
|
||||||
|
MODULE_LICENSE("GPL v2");
|
||||||
|
|
@ -0,0 +1,62 @@
|
||||||
|
/*
|
||||||
|
* HSI clients registration interface
|
||||||
|
*
|
||||||
|
* Copyright (C) 2010 Nokia Corporation. All rights reserved.
|
||||||
|
*
|
||||||
|
* Contact: Carlos Chinea <carlos.chinea@nokia.com>
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or
|
||||||
|
* modify it under the terms of the GNU General Public License
|
||||||
|
* version 2 as published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that 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, write to the Free Software
|
||||||
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
||||||
|
* 02110-1301 USA
|
||||||
|
*/
|
||||||
|
#include <linux/hsi/hsi.h>
|
||||||
|
#include <linux/list.h>
|
||||||
|
#include <linux/slab.h>
|
||||||
|
#include "hsi_core.h"
|
||||||
|
|
||||||
|
/*
|
||||||
|
* hsi_board_list is only used internally by the HSI framework.
|
||||||
|
* No one else is allowed to make use of it.
|
||||||
|
*/
|
||||||
|
LIST_HEAD(hsi_board_list);
|
||||||
|
EXPORT_SYMBOL_GPL(hsi_board_list);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_register_board_info - Register HSI clients information
|
||||||
|
* @info: Array of HSI clients on the board
|
||||||
|
* @len: Length of the array
|
||||||
|
*
|
||||||
|
* HSI clients are statically declared and registered on board files.
|
||||||
|
*
|
||||||
|
* HSI clients will be automatically registered to the HSI bus once the
|
||||||
|
* controller and the port where the clients wishes to attach are registered
|
||||||
|
* to it.
|
||||||
|
*
|
||||||
|
* Return -errno on failure, 0 on success.
|
||||||
|
*/
|
||||||
|
int __init hsi_register_board_info(struct hsi_board_info const *info,
|
||||||
|
unsigned int len)
|
||||||
|
{
|
||||||
|
struct hsi_cl_info *cl_info;
|
||||||
|
|
||||||
|
cl_info = kzalloc(sizeof(*cl_info) * len, GFP_KERNEL);
|
||||||
|
if (!cl_info)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
for (; len; len--, info++, cl_info++) {
|
||||||
|
cl_info->info = *info;
|
||||||
|
list_add_tail(&cl_info->list, &hsi_board_list);
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,35 @@
|
||||||
|
/*
|
||||||
|
* HSI framework internal interfaces,
|
||||||
|
*
|
||||||
|
* Copyright (C) 2010 Nokia Corporation. All rights reserved.
|
||||||
|
*
|
||||||
|
* Contact: Carlos Chinea <carlos.chinea@nokia.com>
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or
|
||||||
|
* modify it under the terms of the GNU General Public License
|
||||||
|
* version 2 as published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that 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, write to the Free Software
|
||||||
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
||||||
|
* 02110-1301 USA
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef __LINUX_HSI_CORE_H__
|
||||||
|
#define __LINUX_HSI_CORE_H__
|
||||||
|
|
||||||
|
#include <linux/hsi/hsi.h>
|
||||||
|
|
||||||
|
struct hsi_cl_info {
|
||||||
|
struct list_head list;
|
||||||
|
struct hsi_board_info info;
|
||||||
|
};
|
||||||
|
|
||||||
|
extern struct list_head hsi_board_list;
|
||||||
|
|
||||||
|
#endif /* __LINUX_HSI_CORE_H__ */
|
||||||
|
|
@ -0,0 +1,410 @@
|
||||||
|
/*
|
||||||
|
* HSI core header file.
|
||||||
|
*
|
||||||
|
* Copyright (C) 2010 Nokia Corporation. All rights reserved.
|
||||||
|
*
|
||||||
|
* Contact: Carlos Chinea <carlos.chinea@nokia.com>
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or
|
||||||
|
* modify it under the terms of the GNU General Public License
|
||||||
|
* version 2 as published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that 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, write to the Free Software
|
||||||
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
||||||
|
* 02110-1301 USA
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef __LINUX_HSI_H__
|
||||||
|
#define __LINUX_HSI_H__
|
||||||
|
|
||||||
|
#include <linux/device.h>
|
||||||
|
#include <linux/mutex.h>
|
||||||
|
#include <linux/scatterlist.h>
|
||||||
|
#include <linux/spinlock.h>
|
||||||
|
#include <linux/list.h>
|
||||||
|
#include <linux/module.h>
|
||||||
|
|
||||||
|
/* HSI message ttype */
|
||||||
|
#define HSI_MSG_READ 0
|
||||||
|
#define HSI_MSG_WRITE 1
|
||||||
|
|
||||||
|
/* HSI configuration values */
|
||||||
|
enum {
|
||||||
|
HSI_MODE_STREAM = 1,
|
||||||
|
HSI_MODE_FRAME,
|
||||||
|
};
|
||||||
|
|
||||||
|
enum {
|
||||||
|
HSI_FLOW_SYNC, /* Synchronized flow */
|
||||||
|
HSI_FLOW_PIPE, /* Pipelined flow */
|
||||||
|
};
|
||||||
|
|
||||||
|
enum {
|
||||||
|
HSI_ARB_RR, /* Round-robin arbitration */
|
||||||
|
HSI_ARB_PRIO, /* Channel priority arbitration */
|
||||||
|
};
|
||||||
|
|
||||||
|
#define HSI_MAX_CHANNELS 16
|
||||||
|
|
||||||
|
/* HSI message status codes */
|
||||||
|
enum {
|
||||||
|
HSI_STATUS_COMPLETED, /* Message transfer is completed */
|
||||||
|
HSI_STATUS_PENDING, /* Message pending to be read/write (POLL) */
|
||||||
|
HSI_STATUS_PROCEEDING, /* Message transfer is ongoing */
|
||||||
|
HSI_STATUS_QUEUED, /* Message waiting to be served */
|
||||||
|
HSI_STATUS_ERROR, /* Error when message transfer was ongoing */
|
||||||
|
};
|
||||||
|
|
||||||
|
/* HSI port event codes */
|
||||||
|
enum {
|
||||||
|
HSI_EVENT_START_RX,
|
||||||
|
HSI_EVENT_STOP_RX,
|
||||||
|
};
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct hsi_config - Configuration for RX/TX HSI modules
|
||||||
|
* @mode: Bit transmission mode (STREAM or FRAME)
|
||||||
|
* @channels: Number of channels to use [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;
|
||||||
|
union {
|
||||||
|
unsigned int flow; /* RX only */
|
||||||
|
unsigned int arb_mode; /* TX only */
|
||||||
|
};
|
||||||
|
};
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct hsi_board_info - HSI client board info
|
||||||
|
* @name: Name for the HSI device
|
||||||
|
* @hsi_id: HSI controller id where the client sits
|
||||||
|
* @port: Port number in the controller where the client sits
|
||||||
|
* @tx_cfg: HSI TX configuration
|
||||||
|
* @rx_cfg: HSI RX configuration
|
||||||
|
* @platform_data: Platform related data
|
||||||
|
* @archdata: Architecture-dependent device data
|
||||||
|
*/
|
||||||
|
struct hsi_board_info {
|
||||||
|
const char *name;
|
||||||
|
unsigned int hsi_id;
|
||||||
|
unsigned int port;
|
||||||
|
struct hsi_config tx_cfg;
|
||||||
|
struct hsi_config rx_cfg;
|
||||||
|
void *platform_data;
|
||||||
|
struct dev_archdata *archdata;
|
||||||
|
};
|
||||||
|
|
||||||
|
#ifdef CONFIG_HSI_BOARDINFO
|
||||||
|
extern int hsi_register_board_info(struct hsi_board_info const *info,
|
||||||
|
unsigned int len);
|
||||||
|
#else
|
||||||
|
static inline int hsi_register_board_info(struct hsi_board_info const *info,
|
||||||
|
unsigned int len)
|
||||||
|
{
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
#endif /* CONFIG_HSI_BOARDINFO */
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct hsi_client - HSI client attached to an HSI port
|
||||||
|
* @device: Driver model representation of the device
|
||||||
|
* @tx_cfg: HSI TX configuration
|
||||||
|
* @rx_cfg: HSI RX configuration
|
||||||
|
* @hsi_start_rx: Called after incoming wake line goes high
|
||||||
|
* @hsi_stop_rx: Called after incoming wake line goes low
|
||||||
|
*/
|
||||||
|
struct hsi_client {
|
||||||
|
struct device device;
|
||||||
|
struct hsi_config tx_cfg;
|
||||||
|
struct hsi_config rx_cfg;
|
||||||
|
void (*hsi_start_rx)(struct hsi_client *cl);
|
||||||
|
void (*hsi_stop_rx)(struct hsi_client *cl);
|
||||||
|
/* private: */
|
||||||
|
unsigned int pclaimed:1;
|
||||||
|
struct list_head link;
|
||||||
|
};
|
||||||
|
|
||||||
|
#define to_hsi_client(dev) container_of(dev, struct hsi_client, device)
|
||||||
|
|
||||||
|
static inline void hsi_client_set_drvdata(struct hsi_client *cl, void *data)
|
||||||
|
{
|
||||||
|
dev_set_drvdata(&cl->device, data);
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline void *hsi_client_drvdata(struct hsi_client *cl)
|
||||||
|
{
|
||||||
|
return dev_get_drvdata(&cl->device);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct hsi_client_driver - Driver associated to an HSI client
|
||||||
|
* @driver: Driver model representation of the driver
|
||||||
|
*/
|
||||||
|
struct hsi_client_driver {
|
||||||
|
struct device_driver driver;
|
||||||
|
};
|
||||||
|
|
||||||
|
#define to_hsi_client_driver(drv) container_of(drv, struct hsi_client_driver,\
|
||||||
|
driver)
|
||||||
|
|
||||||
|
int hsi_register_client_driver(struct hsi_client_driver *drv);
|
||||||
|
|
||||||
|
static inline void hsi_unregister_client_driver(struct hsi_client_driver *drv)
|
||||||
|
{
|
||||||
|
driver_unregister(&drv->driver);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct hsi_msg - HSI message descriptor
|
||||||
|
* @link: Free to use by the current descriptor owner
|
||||||
|
* @cl: HSI device client that issues the transfer
|
||||||
|
* @sgt: Head of the scatterlist array
|
||||||
|
* @context: Client context data associated to the transfer
|
||||||
|
* @complete: Transfer completion callback
|
||||||
|
* @destructor: Destructor to free resources when flushing
|
||||||
|
* @status: Status of the transfer when completed
|
||||||
|
* @actual_len: Actual length of data transfered on completion
|
||||||
|
* @channel: Channel were to TX/RX the message
|
||||||
|
* @ttype: Transfer type (TX if set, RX otherwise)
|
||||||
|
* @break_frame: if true HSI will send/receive a break frame. Data buffers are
|
||||||
|
* ignored in the request.
|
||||||
|
*/
|
||||||
|
struct hsi_msg {
|
||||||
|
struct list_head link;
|
||||||
|
struct hsi_client *cl;
|
||||||
|
struct sg_table sgt;
|
||||||
|
void *context;
|
||||||
|
|
||||||
|
void (*complete)(struct hsi_msg *msg);
|
||||||
|
void (*destructor)(struct hsi_msg *msg);
|
||||||
|
|
||||||
|
int status;
|
||||||
|
unsigned int actual_len;
|
||||||
|
unsigned int channel;
|
||||||
|
unsigned int ttype:1;
|
||||||
|
unsigned int break_frame:1;
|
||||||
|
};
|
||||||
|
|
||||||
|
struct hsi_msg *hsi_alloc_msg(unsigned int n_frag, gfp_t flags);
|
||||||
|
void hsi_free_msg(struct hsi_msg *msg);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct hsi_port - HSI port device
|
||||||
|
* @device: Driver model representation of the device
|
||||||
|
* @tx_cfg: Current TX path configuration
|
||||||
|
* @rx_cfg: Current RX path configuration
|
||||||
|
* @num: Port number
|
||||||
|
* @shared: Set when port can be shared by different clients
|
||||||
|
* @claimed: Reference count of clients which claimed the port
|
||||||
|
* @lock: Serialize port claim
|
||||||
|
* @async: Asynchronous transfer callback
|
||||||
|
* @setup: Callback to set the HSI client configuration
|
||||||
|
* @flush: Callback to clean the HW state and destroy all pending transfers
|
||||||
|
* @start_tx: Callback to inform that a client wants to TX data
|
||||||
|
* @stop_tx: Callback to inform that a client no longer wishes to TX data
|
||||||
|
* @release: Callback to inform that a client no longer uses the port
|
||||||
|
* @clients: List of hsi_clients using the port.
|
||||||
|
* @clock: Lock to serialize access to the clients list.
|
||||||
|
*/
|
||||||
|
struct hsi_port {
|
||||||
|
struct device device;
|
||||||
|
struct hsi_config tx_cfg;
|
||||||
|
struct hsi_config rx_cfg;
|
||||||
|
unsigned int num;
|
||||||
|
unsigned int shared:1;
|
||||||
|
int claimed;
|
||||||
|
struct mutex lock;
|
||||||
|
int (*async)(struct hsi_msg *msg);
|
||||||
|
int (*setup)(struct hsi_client *cl);
|
||||||
|
int (*flush)(struct hsi_client *cl);
|
||||||
|
int (*start_tx)(struct hsi_client *cl);
|
||||||
|
int (*stop_tx)(struct hsi_client *cl);
|
||||||
|
int (*release)(struct hsi_client *cl);
|
||||||
|
struct list_head clients;
|
||||||
|
spinlock_t clock;
|
||||||
|
};
|
||||||
|
|
||||||
|
#define to_hsi_port(dev) container_of(dev, struct hsi_port, device)
|
||||||
|
#define hsi_get_port(cl) to_hsi_port((cl)->device.parent)
|
||||||
|
|
||||||
|
void hsi_event(struct hsi_port *port, unsigned int event);
|
||||||
|
int hsi_claim_port(struct hsi_client *cl, unsigned int share);
|
||||||
|
void hsi_release_port(struct hsi_client *cl);
|
||||||
|
|
||||||
|
static inline int hsi_port_claimed(struct hsi_client *cl)
|
||||||
|
{
|
||||||
|
return cl->pclaimed;
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline void hsi_port_set_drvdata(struct hsi_port *port, void *data)
|
||||||
|
{
|
||||||
|
dev_set_drvdata(&port->device, data);
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline void *hsi_port_drvdata(struct hsi_port *port)
|
||||||
|
{
|
||||||
|
return dev_get_drvdata(&port->device);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* struct hsi_controller - HSI controller device
|
||||||
|
* @device: Driver model representation of the device
|
||||||
|
* @owner: Pointer to the module owning the controller
|
||||||
|
* @id: HSI controller ID
|
||||||
|
* @num_ports: Number of ports in the HSI controller
|
||||||
|
* @port: Array of HSI ports
|
||||||
|
*/
|
||||||
|
struct hsi_controller {
|
||||||
|
struct device device;
|
||||||
|
struct module *owner;
|
||||||
|
unsigned int id;
|
||||||
|
unsigned int num_ports;
|
||||||
|
struct hsi_port *port;
|
||||||
|
};
|
||||||
|
|
||||||
|
#define to_hsi_controller(dev) container_of(dev, struct hsi_controller, device)
|
||||||
|
|
||||||
|
struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags);
|
||||||
|
void hsi_free_controller(struct hsi_controller *hsi);
|
||||||
|
int hsi_register_controller(struct hsi_controller *hsi);
|
||||||
|
void hsi_unregister_controller(struct hsi_controller *hsi);
|
||||||
|
|
||||||
|
static inline void hsi_controller_set_drvdata(struct hsi_controller *hsi,
|
||||||
|
void *data)
|
||||||
|
{
|
||||||
|
dev_set_drvdata(&hsi->device, data);
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline void *hsi_controller_drvdata(struct hsi_controller *hsi)
|
||||||
|
{
|
||||||
|
return dev_get_drvdata(&hsi->device);
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline struct hsi_port *hsi_find_port_num(struct hsi_controller *hsi,
|
||||||
|
unsigned int num)
|
||||||
|
{
|
||||||
|
return (num < hsi->num_ports) ? &hsi->port[num] : NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* API for HSI clients
|
||||||
|
*/
|
||||||
|
int hsi_async(struct hsi_client *cl, struct hsi_msg *msg);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_id - Get HSI controller ID associated to a client
|
||||||
|
* @cl: Pointer to a HSI client
|
||||||
|
*
|
||||||
|
* Return the controller id where the client is attached to
|
||||||
|
*/
|
||||||
|
static inline unsigned int hsi_id(struct hsi_client *cl)
|
||||||
|
{
|
||||||
|
return to_hsi_controller(cl->device.parent->parent)->id;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_port_id - Gets the port number a client is attached to
|
||||||
|
* @cl: Pointer to HSI client
|
||||||
|
*
|
||||||
|
* Return the port number associated to the client
|
||||||
|
*/
|
||||||
|
static inline unsigned int hsi_port_id(struct hsi_client *cl)
|
||||||
|
{
|
||||||
|
return to_hsi_port(cl->device.parent)->num;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_setup - Configure the client's port
|
||||||
|
* @cl: Pointer to the HSI client
|
||||||
|
*
|
||||||
|
* When sharing ports, clients should either relay on a single
|
||||||
|
* client setup or have the same setup for all of them.
|
||||||
|
*
|
||||||
|
* Return -errno on failure, 0 on success
|
||||||
|
*/
|
||||||
|
static inline int hsi_setup(struct hsi_client *cl)
|
||||||
|
{
|
||||||
|
if (!hsi_port_claimed(cl))
|
||||||
|
return -EACCES;
|
||||||
|
return hsi_get_port(cl)->setup(cl);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_flush - Flush all pending transactions on the client's port
|
||||||
|
* @cl: Pointer to the HSI client
|
||||||
|
*
|
||||||
|
* This function will destroy all pending hsi_msg in the port and reset
|
||||||
|
* the HW port so it is ready to receive and transmit from a clean state.
|
||||||
|
*
|
||||||
|
* Return -errno on failure, 0 on success
|
||||||
|
*/
|
||||||
|
static inline int hsi_flush(struct hsi_client *cl)
|
||||||
|
{
|
||||||
|
if (!hsi_port_claimed(cl))
|
||||||
|
return -EACCES;
|
||||||
|
return hsi_get_port(cl)->flush(cl);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_async_read - Submit a read transfer
|
||||||
|
* @cl: Pointer to the HSI client
|
||||||
|
* @msg: HSI message descriptor of the transfer
|
||||||
|
*
|
||||||
|
* Return -errno on failure, 0 on success
|
||||||
|
*/
|
||||||
|
static inline int hsi_async_read(struct hsi_client *cl, struct hsi_msg *msg)
|
||||||
|
{
|
||||||
|
msg->ttype = HSI_MSG_READ;
|
||||||
|
return hsi_async(cl, msg);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_async_write - Submit a write transfer
|
||||||
|
* @cl: Pointer to the HSI client
|
||||||
|
* @msg: HSI message descriptor of the transfer
|
||||||
|
*
|
||||||
|
* Return -errno on failure, 0 on success
|
||||||
|
*/
|
||||||
|
static inline int hsi_async_write(struct hsi_client *cl, struct hsi_msg *msg)
|
||||||
|
{
|
||||||
|
msg->ttype = HSI_MSG_WRITE;
|
||||||
|
return hsi_async(cl, msg);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_start_tx - Signal the port that the client wants to start a TX
|
||||||
|
* @cl: Pointer to the HSI client
|
||||||
|
*
|
||||||
|
* Return -errno on failure, 0 on success
|
||||||
|
*/
|
||||||
|
static inline int hsi_start_tx(struct hsi_client *cl)
|
||||||
|
{
|
||||||
|
if (!hsi_port_claimed(cl))
|
||||||
|
return -EACCES;
|
||||||
|
return hsi_get_port(cl)->start_tx(cl);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* hsi_stop_tx - Signal the port that the client no longer wants to transmit
|
||||||
|
* @cl: Pointer to the HSI client
|
||||||
|
*
|
||||||
|
* Return -errno on failure, 0 on success
|
||||||
|
*/
|
||||||
|
static inline int hsi_stop_tx(struct hsi_client *cl)
|
||||||
|
{
|
||||||
|
if (!hsi_port_claimed(cl))
|
||||||
|
return -EACCES;
|
||||||
|
return hsi_get_port(cl)->stop_tx(cl);
|
||||||
|
}
|
||||||
|
#endif /* __LINUX_HSI_H__ */
|
||||||
Loading…
Reference in New Issue