mirror of https://gitee.com/openkylin/linux.git
768 lines
18 KiB
C
768 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#include <linux/hsi/hsi.h>
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#include <linux/compiler.h>
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#include <linux/list.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 <linux/notifier.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include "hsi_core.h"
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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 DEVICE_ATTR_RO(modalias);
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static struct attribute *hsi_bus_dev_attrs[] = {
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&dev_attr_modalias.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(hsi_bus_dev);
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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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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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if (of_driver_match_device(dev, driver))
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return true;
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if (strcmp(dev_name(dev), driver->name) == 0)
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return true;
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return false;
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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_groups = hsi_bus_dev_groups,
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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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struct hsi_client *cl = to_hsi_client(dev);
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kfree(cl->tx_cfg.channels);
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kfree(cl->rx_cfg.channels);
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kfree(cl);
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}
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struct hsi_client *hsi_new_client(struct hsi_port *port,
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struct hsi_board_info *info)
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{
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struct hsi_client *cl;
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size_t size;
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cl = kzalloc(sizeof(*cl), GFP_KERNEL);
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if (!cl)
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goto err;
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cl->tx_cfg = info->tx_cfg;
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if (cl->tx_cfg.channels) {
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size = cl->tx_cfg.num_channels * sizeof(*cl->tx_cfg.channels);
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cl->tx_cfg.channels = kmemdup(info->tx_cfg.channels, size,
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GFP_KERNEL);
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if (!cl->tx_cfg.channels)
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goto err_tx;
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}
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cl->rx_cfg = info->rx_cfg;
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if (cl->rx_cfg.channels) {
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size = cl->rx_cfg.num_channels * sizeof(*cl->rx_cfg.channels);
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cl->rx_cfg.channels = kmemdup(info->rx_cfg.channels, size,
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GFP_KERNEL);
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if (!cl->rx_cfg.channels)
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goto err_rx;
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}
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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, "%s", info->name);
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cl->device.platform_data = info->platform_data;
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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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put_device(&cl->device);
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}
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return cl;
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err_rx:
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kfree(cl->tx_cfg.channels);
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err_tx:
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kfree(cl);
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err:
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return NULL;
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}
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EXPORT_SYMBOL_GPL(hsi_new_client);
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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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#ifdef CONFIG_OF
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static struct hsi_board_info hsi_char_dev_info = {
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.name = "hsi_char",
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};
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static int hsi_of_property_parse_mode(struct device_node *client, char *name,
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unsigned int *result)
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{
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const char *mode;
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int err;
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err = of_property_read_string(client, name, &mode);
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if (err < 0)
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return err;
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if (strcmp(mode, "stream") == 0)
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*result = HSI_MODE_STREAM;
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else if (strcmp(mode, "frame") == 0)
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*result = HSI_MODE_FRAME;
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else
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return -EINVAL;
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return 0;
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}
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static int hsi_of_property_parse_flow(struct device_node *client, char *name,
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unsigned int *result)
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{
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const char *flow;
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int err;
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err = of_property_read_string(client, name, &flow);
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if (err < 0)
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return err;
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if (strcmp(flow, "synchronized") == 0)
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*result = HSI_FLOW_SYNC;
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else if (strcmp(flow, "pipeline") == 0)
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*result = HSI_FLOW_PIPE;
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else
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return -EINVAL;
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return 0;
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}
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static int hsi_of_property_parse_arb_mode(struct device_node *client,
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char *name, unsigned int *result)
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{
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const char *arb_mode;
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int err;
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err = of_property_read_string(client, name, &arb_mode);
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if (err < 0)
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return err;
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if (strcmp(arb_mode, "round-robin") == 0)
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*result = HSI_ARB_RR;
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else if (strcmp(arb_mode, "priority") == 0)
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*result = HSI_ARB_PRIO;
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else
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return -EINVAL;
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return 0;
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}
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static void hsi_add_client_from_dt(struct hsi_port *port,
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struct device_node *client)
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{
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struct hsi_client *cl;
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struct hsi_channel channel;
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struct property *prop;
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char name[32];
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int length, cells, err, i, max_chan, mode;
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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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err = of_modalias_node(client, name, sizeof(name));
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if (err)
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goto err;
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dev_set_name(&cl->device, "%s", name);
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err = hsi_of_property_parse_mode(client, "hsi-mode", &mode);
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if (err) {
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err = hsi_of_property_parse_mode(client, "hsi-rx-mode",
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&cl->rx_cfg.mode);
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if (err)
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goto err;
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err = hsi_of_property_parse_mode(client, "hsi-tx-mode",
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&cl->tx_cfg.mode);
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if (err)
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goto err;
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} else {
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cl->rx_cfg.mode = mode;
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cl->tx_cfg.mode = mode;
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}
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err = of_property_read_u32(client, "hsi-speed-kbps",
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&cl->tx_cfg.speed);
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if (err)
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goto err;
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cl->rx_cfg.speed = cl->tx_cfg.speed;
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err = hsi_of_property_parse_flow(client, "hsi-flow",
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&cl->rx_cfg.flow);
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if (err)
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goto err;
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err = hsi_of_property_parse_arb_mode(client, "hsi-arb-mode",
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&cl->rx_cfg.arb_mode);
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if (err)
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goto err;
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prop = of_find_property(client, "hsi-channel-ids", &length);
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if (!prop) {
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err = -EINVAL;
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goto err;
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}
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cells = length / sizeof(u32);
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cl->rx_cfg.num_channels = cells;
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cl->tx_cfg.num_channels = cells;
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cl->rx_cfg.channels = kcalloc(cells, sizeof(channel), GFP_KERNEL);
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if (!cl->rx_cfg.channels) {
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err = -ENOMEM;
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goto err;
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}
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cl->tx_cfg.channels = kcalloc(cells, sizeof(channel), GFP_KERNEL);
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if (!cl->tx_cfg.channels) {
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err = -ENOMEM;
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goto err2;
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}
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max_chan = 0;
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for (i = 0; i < cells; i++) {
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err = of_property_read_u32_index(client, "hsi-channel-ids", i,
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&channel.id);
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if (err)
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goto err3;
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err = of_property_read_string_index(client, "hsi-channel-names",
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i, &channel.name);
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if (err)
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channel.name = NULL;
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if (channel.id > max_chan)
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max_chan = channel.id;
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cl->rx_cfg.channels[i] = channel;
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cl->tx_cfg.channels[i] = channel;
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}
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cl->rx_cfg.num_hw_channels = max_chan + 1;
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cl->tx_cfg.num_hw_channels = max_chan + 1;
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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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cl->device.of_node = client;
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if (device_register(&cl->device) < 0) {
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pr_err("hsi: failed to register client: %s\n", name);
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put_device(&cl->device);
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}
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return;
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err3:
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kfree(cl->tx_cfg.channels);
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err2:
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kfree(cl->rx_cfg.channels);
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err:
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kfree(cl);
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pr_err("hsi client: missing or incorrect of property: err=%d\n", err);
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}
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void hsi_add_clients_from_dt(struct hsi_port *port, struct device_node *clients)
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{
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struct device_node *child;
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/* register hsi-char device */
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hsi_new_client(port, &hsi_char_dev_info);
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for_each_available_child_of_node(clients, child)
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hsi_add_client_from_dt(port, child);
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}
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EXPORT_SYMBOL_GPL(hsi_add_clients_from_dt);
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#endif
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int hsi_remove_client(struct device *dev, void *data __maybe_unused)
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{
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device_unregister(dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(hsi_remove_client);
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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)
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{
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struct hsi_controller *hsi = to_hsi_controller(dev);
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kfree(hsi->port);
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kfree(hsi);
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}
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static void hsi_port_release(struct device *dev)
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{
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kfree(to_hsi_port(dev));
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}
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/**
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* hsi_port_unregister_clients - Unregister an HSI port
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* @port: The HSI port to unregister
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*/
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void hsi_port_unregister_clients(struct hsi_port *port)
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{
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device_for_each_child(&port->device, NULL, hsi_remove_client);
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}
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EXPORT_SYMBOL_GPL(hsi_port_unregister_clients);
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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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err = device_add(&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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err = device_add(&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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while (i-- > 0)
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device_del(&hsi->port[i]->device);
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device_del(&hsi->device);
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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_put_controller - Free an HSI controller
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*
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* @hsi: Pointer to the HSI controller to freed
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*
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* HSI controller drivers should only use this function if they need
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* to free their allocated hsi_controller structures before a successful
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* call to hsi_register_controller. Other use is not allowed.
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*/
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void hsi_put_controller(struct hsi_controller *hsi)
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{
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unsigned int i;
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if (!hsi)
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return;
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for (i = 0; i < hsi->num_ports; i++)
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if (hsi->port && hsi->port[i])
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put_device(&hsi->port[i]->device);
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put_device(&hsi->device);
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}
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EXPORT_SYMBOL_GPL(hsi_put_controller);
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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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hsi = kzalloc(sizeof(*hsi), flags);
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if (!hsi)
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return NULL;
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port = kcalloc(n_ports, sizeof(*port), flags);
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if (!port) {
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kfree(hsi);
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return NULL;
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}
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hsi->num_ports = n_ports;
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hsi->port = port;
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hsi->device.release = hsi_controller_release;
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device_initialize(&hsi->device);
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for (i = 0; i < n_ports; i++) {
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port[i] = kzalloc(sizeof(**port), flags);
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if (port[i] == NULL)
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goto out;
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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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BLOCKING_INIT_NOTIFIER_HEAD(&port[i]->n_head);
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dev_set_name(&port[i]->device, "port%d", i);
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hsi->port[i]->device.release = hsi_port_release;
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device_initialize(&hsi->port[i]->device);
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}
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return hsi;
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out:
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hsi_put_controller(hsi);
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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_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)
|
|
{
|
|
struct hsi_msg *msg;
|
|
int err;
|
|
|
|
msg = kzalloc(sizeof(*msg), flags);
|
|
if (!msg)
|
|
return NULL;
|
|
|
|
if (!nents)
|
|
return msg;
|
|
|
|
err = sg_alloc_table(&msg->sgt, nents, flags);
|
|
if (unlikely(err)) {
|
|
kfree(msg);
|
|
msg = NULL;
|
|
}
|
|
|
|
return msg;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hsi_alloc_msg);
|
|
|
|
/**
|
|
* hsi_async - Submit an HSI transfer to the controller
|
|
* @cl: HSI client sending the transfer
|
|
* @msg: The HSI transfer passed to controller
|
|
*
|
|
* The HSI message must have the channel, ttype, complete and destructor
|
|
* fields set beforehand. If nents > 0 then the client has to initialize
|
|
* also the scatterlists to point to the buffers to write to or read from.
|
|
*
|
|
* HSI controllers relay on pre-allocated buffers from their clients and they
|
|
* do not allocate buffers on their own.
|
|
*
|
|
* Once the HSI message transfer finishes, the HSI controller calls the
|
|
* complete callback with the status and actual_len fields of the HSI message
|
|
* 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_event_notifier_call(struct notifier_block *nb,
|
|
unsigned long event, void *data __maybe_unused)
|
|
{
|
|
struct hsi_client *cl = container_of(nb, struct hsi_client, nb);
|
|
|
|
(*cl->ehandler)(cl, event);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* hsi_register_port_event - Register a client to receive port events
|
|
* @cl: HSI client that wants to receive port events
|
|
* @handler: Event handler callback
|
|
*
|
|
* Clients should register a callback to be able to receive
|
|
* events from the ports. Registration should happen after
|
|
* claiming the port.
|
|
* The handler can be called in interrupt context.
|
|
*
|
|
* Returns -errno on error, or 0 on success.
|
|
*/
|
|
int hsi_register_port_event(struct hsi_client *cl,
|
|
void (*handler)(struct hsi_client *, unsigned long))
|
|
{
|
|
struct hsi_port *port = hsi_get_port(cl);
|
|
|
|
if (!handler || cl->ehandler)
|
|
return -EINVAL;
|
|
if (!hsi_port_claimed(cl))
|
|
return -EACCES;
|
|
cl->ehandler = handler;
|
|
cl->nb.notifier_call = hsi_event_notifier_call;
|
|
|
|
return blocking_notifier_chain_register(&port->n_head, &cl->nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hsi_register_port_event);
|
|
|
|
/**
|
|
* hsi_unregister_port_event - Stop receiving port events for a client
|
|
* @cl: HSI client that wants to stop receiving port events
|
|
*
|
|
* Clients should call this function before releasing their associated
|
|
* port.
|
|
*
|
|
* Returns -errno on error, or 0 on success.
|
|
*/
|
|
int hsi_unregister_port_event(struct hsi_client *cl)
|
|
{
|
|
struct hsi_port *port = hsi_get_port(cl);
|
|
int err;
|
|
|
|
WARN_ON(!hsi_port_claimed(cl));
|
|
|
|
err = blocking_notifier_chain_unregister(&port->n_head, &cl->nb);
|
|
if (!err)
|
|
cl->ehandler = NULL;
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hsi_unregister_port_event);
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
* Returns -errno on error, or 0 on success.
|
|
*/
|
|
int hsi_event(struct hsi_port *port, unsigned long event)
|
|
{
|
|
return blocking_notifier_call_chain(&port->n_head, event, NULL);
|
|
}
|
|
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);
|
|
}
|
|
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");
|