mirror of https://gitee.com/openkylin/linux.git
580 lines
14 KiB
C
580 lines
14 KiB
C
/*
|
|
* Copyright (c) 2015, Sony Mobile Communications AB.
|
|
* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 and
|
|
* only 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.
|
|
*/
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <linux/list.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/irqdomain.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/soc/qcom/smem.h>
|
|
#include <linux/soc/qcom/smem_state.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
/*
|
|
* The Shared Memory Point to Point (SMP2P) protocol facilitates communication
|
|
* of a single 32-bit value between two processors. Each value has a single
|
|
* writer (the local side) and a single reader (the remote side). Values are
|
|
* uniquely identified in the system by the directed edge (local processor ID
|
|
* to remote processor ID) and a string identifier.
|
|
*
|
|
* Each processor is responsible for creating the outgoing SMEM items and each
|
|
* item is writable by the local processor and readable by the remote
|
|
* processor. By using two separate SMEM items that are single-reader and
|
|
* single-writer, SMP2P does not require any remote locking mechanisms.
|
|
*
|
|
* The driver uses the Linux GPIO and interrupt framework to expose a virtual
|
|
* GPIO for each outbound entry and a virtual interrupt controller for each
|
|
* inbound entry.
|
|
*/
|
|
|
|
#define SMP2P_MAX_ENTRY 16
|
|
#define SMP2P_MAX_ENTRY_NAME 16
|
|
|
|
#define SMP2P_FEATURE_SSR_ACK 0x1
|
|
|
|
#define SMP2P_MAGIC 0x504d5324
|
|
|
|
/**
|
|
* struct smp2p_smem_item - in memory communication structure
|
|
* @magic: magic number
|
|
* @version: version - must be 1
|
|
* @features: features flag - currently unused
|
|
* @local_pid: processor id of sending end
|
|
* @remote_pid: processor id of receiving end
|
|
* @total_entries: number of entries - always SMP2P_MAX_ENTRY
|
|
* @valid_entries: number of allocated entries
|
|
* @flags:
|
|
* @entries: individual communication entries
|
|
* @name: name of the entry
|
|
* @value: content of the entry
|
|
*/
|
|
struct smp2p_smem_item {
|
|
u32 magic;
|
|
u8 version;
|
|
unsigned features:24;
|
|
u16 local_pid;
|
|
u16 remote_pid;
|
|
u16 total_entries;
|
|
u16 valid_entries;
|
|
u32 flags;
|
|
|
|
struct {
|
|
u8 name[SMP2P_MAX_ENTRY_NAME];
|
|
u32 value;
|
|
} entries[SMP2P_MAX_ENTRY];
|
|
} __packed;
|
|
|
|
/**
|
|
* struct smp2p_entry - driver context matching one entry
|
|
* @node: list entry to keep track of allocated entries
|
|
* @smp2p: reference to the device driver context
|
|
* @name: name of the entry, to match against smp2p_smem_item
|
|
* @value: pointer to smp2p_smem_item entry value
|
|
* @last_value: last handled value
|
|
* @domain: irq_domain for inbound entries
|
|
* @irq_enabled:bitmap to track enabled irq bits
|
|
* @irq_rising: bitmap to mark irq bits for rising detection
|
|
* @irq_falling:bitmap to mark irq bits for falling detection
|
|
* @state: smem state handle
|
|
* @lock: spinlock to protect read-modify-write of the value
|
|
*/
|
|
struct smp2p_entry {
|
|
struct list_head node;
|
|
struct qcom_smp2p *smp2p;
|
|
|
|
const char *name;
|
|
u32 *value;
|
|
u32 last_value;
|
|
|
|
struct irq_domain *domain;
|
|
DECLARE_BITMAP(irq_enabled, 32);
|
|
DECLARE_BITMAP(irq_rising, 32);
|
|
DECLARE_BITMAP(irq_falling, 32);
|
|
|
|
struct qcom_smem_state *state;
|
|
|
|
spinlock_t lock;
|
|
};
|
|
|
|
#define SMP2P_INBOUND 0
|
|
#define SMP2P_OUTBOUND 1
|
|
|
|
/**
|
|
* struct qcom_smp2p - device driver context
|
|
* @dev: device driver handle
|
|
* @in: pointer to the inbound smem item
|
|
* @smem_items: ids of the two smem items
|
|
* @valid_entries: already scanned inbound entries
|
|
* @local_pid: processor id of the inbound edge
|
|
* @remote_pid: processor id of the outbound edge
|
|
* @ipc_regmap: regmap for the outbound ipc
|
|
* @ipc_offset: offset within the regmap
|
|
* @ipc_bit: bit in regmap@offset to kick to signal remote processor
|
|
* @inbound: list of inbound entries
|
|
* @outbound: list of outbound entries
|
|
*/
|
|
struct qcom_smp2p {
|
|
struct device *dev;
|
|
|
|
struct smp2p_smem_item *in;
|
|
struct smp2p_smem_item *out;
|
|
|
|
unsigned smem_items[SMP2P_OUTBOUND + 1];
|
|
|
|
unsigned valid_entries;
|
|
|
|
unsigned local_pid;
|
|
unsigned remote_pid;
|
|
|
|
struct regmap *ipc_regmap;
|
|
int ipc_offset;
|
|
int ipc_bit;
|
|
|
|
struct list_head inbound;
|
|
struct list_head outbound;
|
|
};
|
|
|
|
static void qcom_smp2p_kick(struct qcom_smp2p *smp2p)
|
|
{
|
|
/* Make sure any updated data is written before the kick */
|
|
wmb();
|
|
regmap_write(smp2p->ipc_regmap, smp2p->ipc_offset, BIT(smp2p->ipc_bit));
|
|
}
|
|
|
|
/**
|
|
* qcom_smp2p_intr() - interrupt handler for incoming notifications
|
|
* @irq: unused
|
|
* @data: smp2p driver context
|
|
*
|
|
* Handle notifications from the remote side to handle newly allocated entries
|
|
* or any changes to the state bits of existing entries.
|
|
*/
|
|
static irqreturn_t qcom_smp2p_intr(int irq, void *data)
|
|
{
|
|
struct smp2p_smem_item *in;
|
|
struct smp2p_entry *entry;
|
|
struct qcom_smp2p *smp2p = data;
|
|
unsigned smem_id = smp2p->smem_items[SMP2P_INBOUND];
|
|
unsigned pid = smp2p->remote_pid;
|
|
size_t size;
|
|
int irq_pin;
|
|
u32 status;
|
|
char buf[SMP2P_MAX_ENTRY_NAME];
|
|
u32 val;
|
|
int i;
|
|
|
|
in = smp2p->in;
|
|
|
|
/* Acquire smem item, if not already found */
|
|
if (!in) {
|
|
in = qcom_smem_get(pid, smem_id, &size);
|
|
if (IS_ERR(in)) {
|
|
dev_err(smp2p->dev,
|
|
"Unable to acquire remote smp2p item\n");
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
smp2p->in = in;
|
|
}
|
|
|
|
/* Match newly created entries */
|
|
for (i = smp2p->valid_entries; i < in->valid_entries; i++) {
|
|
list_for_each_entry(entry, &smp2p->inbound, node) {
|
|
memcpy(buf, in->entries[i].name, sizeof(buf));
|
|
if (!strcmp(buf, entry->name)) {
|
|
entry->value = &in->entries[i].value;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
smp2p->valid_entries = i;
|
|
|
|
/* Fire interrupts based on any value changes */
|
|
list_for_each_entry(entry, &smp2p->inbound, node) {
|
|
/* Ignore entries not yet allocated by the remote side */
|
|
if (!entry->value)
|
|
continue;
|
|
|
|
val = readl(entry->value);
|
|
|
|
status = val ^ entry->last_value;
|
|
entry->last_value = val;
|
|
|
|
/* No changes of this entry? */
|
|
if (!status)
|
|
continue;
|
|
|
|
for_each_set_bit(i, entry->irq_enabled, 32) {
|
|
if (!(status & BIT(i)))
|
|
continue;
|
|
|
|
if ((val & BIT(i) && test_bit(i, entry->irq_rising)) ||
|
|
(!(val & BIT(i)) && test_bit(i, entry->irq_falling))) {
|
|
irq_pin = irq_find_mapping(entry->domain, i);
|
|
handle_nested_irq(irq_pin);
|
|
}
|
|
}
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void smp2p_mask_irq(struct irq_data *irqd)
|
|
{
|
|
struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd);
|
|
irq_hw_number_t irq = irqd_to_hwirq(irqd);
|
|
|
|
clear_bit(irq, entry->irq_enabled);
|
|
}
|
|
|
|
static void smp2p_unmask_irq(struct irq_data *irqd)
|
|
{
|
|
struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd);
|
|
irq_hw_number_t irq = irqd_to_hwirq(irqd);
|
|
|
|
set_bit(irq, entry->irq_enabled);
|
|
}
|
|
|
|
static int smp2p_set_irq_type(struct irq_data *irqd, unsigned int type)
|
|
{
|
|
struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd);
|
|
irq_hw_number_t irq = irqd_to_hwirq(irqd);
|
|
|
|
if (!(type & IRQ_TYPE_EDGE_BOTH))
|
|
return -EINVAL;
|
|
|
|
if (type & IRQ_TYPE_EDGE_RISING)
|
|
set_bit(irq, entry->irq_rising);
|
|
else
|
|
clear_bit(irq, entry->irq_rising);
|
|
|
|
if (type & IRQ_TYPE_EDGE_FALLING)
|
|
set_bit(irq, entry->irq_falling);
|
|
else
|
|
clear_bit(irq, entry->irq_falling);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct irq_chip smp2p_irq_chip = {
|
|
.name = "smp2p",
|
|
.irq_mask = smp2p_mask_irq,
|
|
.irq_unmask = smp2p_unmask_irq,
|
|
.irq_set_type = smp2p_set_irq_type,
|
|
};
|
|
|
|
static int smp2p_irq_map(struct irq_domain *d,
|
|
unsigned int irq,
|
|
irq_hw_number_t hw)
|
|
{
|
|
struct smp2p_entry *entry = d->host_data;
|
|
|
|
irq_set_chip_and_handler(irq, &smp2p_irq_chip, handle_level_irq);
|
|
irq_set_chip_data(irq, entry);
|
|
irq_set_nested_thread(irq, 1);
|
|
irq_set_noprobe(irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct irq_domain_ops smp2p_irq_ops = {
|
|
.map = smp2p_irq_map,
|
|
.xlate = irq_domain_xlate_twocell,
|
|
};
|
|
|
|
static int qcom_smp2p_inbound_entry(struct qcom_smp2p *smp2p,
|
|
struct smp2p_entry *entry,
|
|
struct device_node *node)
|
|
{
|
|
entry->domain = irq_domain_add_linear(node, 32, &smp2p_irq_ops, entry);
|
|
if (!entry->domain) {
|
|
dev_err(smp2p->dev, "failed to add irq_domain\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smp2p_update_bits(void *data, u32 mask, u32 value)
|
|
{
|
|
struct smp2p_entry *entry = data;
|
|
u32 orig;
|
|
u32 val;
|
|
|
|
spin_lock(&entry->lock);
|
|
val = orig = readl(entry->value);
|
|
val &= ~mask;
|
|
val |= value;
|
|
writel(val, entry->value);
|
|
spin_unlock(&entry->lock);
|
|
|
|
if (val != orig)
|
|
qcom_smp2p_kick(entry->smp2p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct qcom_smem_state_ops smp2p_state_ops = {
|
|
.update_bits = smp2p_update_bits,
|
|
};
|
|
|
|
static int qcom_smp2p_outbound_entry(struct qcom_smp2p *smp2p,
|
|
struct smp2p_entry *entry,
|
|
struct device_node *node)
|
|
{
|
|
struct smp2p_smem_item *out = smp2p->out;
|
|
char buf[SMP2P_MAX_ENTRY_NAME] = {};
|
|
|
|
/* Allocate an entry from the smem item */
|
|
strlcpy(buf, entry->name, SMP2P_MAX_ENTRY_NAME);
|
|
memcpy(out->entries[out->valid_entries].name, buf, SMP2P_MAX_ENTRY_NAME);
|
|
|
|
/* Make the logical entry reference the physical value */
|
|
entry->value = &out->entries[out->valid_entries].value;
|
|
|
|
out->valid_entries++;
|
|
|
|
entry->state = qcom_smem_state_register(node, &smp2p_state_ops, entry);
|
|
if (IS_ERR(entry->state)) {
|
|
dev_err(smp2p->dev, "failed to register qcom_smem_state\n");
|
|
return PTR_ERR(entry->state);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qcom_smp2p_alloc_outbound_item(struct qcom_smp2p *smp2p)
|
|
{
|
|
struct smp2p_smem_item *out;
|
|
unsigned smem_id = smp2p->smem_items[SMP2P_OUTBOUND];
|
|
unsigned pid = smp2p->remote_pid;
|
|
int ret;
|
|
|
|
ret = qcom_smem_alloc(pid, smem_id, sizeof(*out));
|
|
if (ret < 0 && ret != -EEXIST) {
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(smp2p->dev,
|
|
"unable to allocate local smp2p item\n");
|
|
return ret;
|
|
}
|
|
|
|
out = qcom_smem_get(pid, smem_id, NULL);
|
|
if (IS_ERR(out)) {
|
|
dev_err(smp2p->dev, "Unable to acquire local smp2p item\n");
|
|
return PTR_ERR(out);
|
|
}
|
|
|
|
memset(out, 0, sizeof(*out));
|
|
out->magic = SMP2P_MAGIC;
|
|
out->local_pid = smp2p->local_pid;
|
|
out->remote_pid = smp2p->remote_pid;
|
|
out->total_entries = SMP2P_MAX_ENTRY;
|
|
out->valid_entries = 0;
|
|
|
|
/*
|
|
* Make sure the rest of the header is written before we validate the
|
|
* item by writing a valid version number.
|
|
*/
|
|
wmb();
|
|
out->version = 1;
|
|
|
|
qcom_smp2p_kick(smp2p);
|
|
|
|
smp2p->out = out;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smp2p_parse_ipc(struct qcom_smp2p *smp2p)
|
|
{
|
|
struct device_node *syscon;
|
|
struct device *dev = smp2p->dev;
|
|
const char *key;
|
|
int ret;
|
|
|
|
syscon = of_parse_phandle(dev->of_node, "qcom,ipc", 0);
|
|
if (!syscon) {
|
|
dev_err(dev, "no qcom,ipc node\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
smp2p->ipc_regmap = syscon_node_to_regmap(syscon);
|
|
if (IS_ERR(smp2p->ipc_regmap))
|
|
return PTR_ERR(smp2p->ipc_regmap);
|
|
|
|
key = "qcom,ipc";
|
|
ret = of_property_read_u32_index(dev->of_node, key, 1, &smp2p->ipc_offset);
|
|
if (ret < 0) {
|
|
dev_err(dev, "no offset in %s\n", key);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = of_property_read_u32_index(dev->of_node, key, 2, &smp2p->ipc_bit);
|
|
if (ret < 0) {
|
|
dev_err(dev, "no bit in %s\n", key);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qcom_smp2p_probe(struct platform_device *pdev)
|
|
{
|
|
struct smp2p_entry *entry;
|
|
struct device_node *node;
|
|
struct qcom_smp2p *smp2p;
|
|
const char *key;
|
|
int irq;
|
|
int ret;
|
|
|
|
smp2p = devm_kzalloc(&pdev->dev, sizeof(*smp2p), GFP_KERNEL);
|
|
if (!smp2p)
|
|
return -ENOMEM;
|
|
|
|
smp2p->dev = &pdev->dev;
|
|
INIT_LIST_HEAD(&smp2p->inbound);
|
|
INIT_LIST_HEAD(&smp2p->outbound);
|
|
|
|
platform_set_drvdata(pdev, smp2p);
|
|
|
|
ret = smp2p_parse_ipc(smp2p);
|
|
if (ret)
|
|
return ret;
|
|
|
|
key = "qcom,smem";
|
|
ret = of_property_read_u32_array(pdev->dev.of_node, key,
|
|
smp2p->smem_items, 2);
|
|
if (ret)
|
|
return ret;
|
|
|
|
key = "qcom,local-pid";
|
|
ret = of_property_read_u32(pdev->dev.of_node, key, &smp2p->local_pid);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "failed to read %s\n", key);
|
|
return -EINVAL;
|
|
}
|
|
|
|
key = "qcom,remote-pid";
|
|
ret = of_property_read_u32(pdev->dev.of_node, key, &smp2p->remote_pid);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "failed to read %s\n", key);
|
|
return -EINVAL;
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
dev_err(&pdev->dev, "unable to acquire smp2p interrupt\n");
|
|
return irq;
|
|
}
|
|
|
|
ret = qcom_smp2p_alloc_outbound_item(smp2p);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for_each_available_child_of_node(pdev->dev.of_node, node) {
|
|
entry = devm_kzalloc(&pdev->dev, sizeof(*entry), GFP_KERNEL);
|
|
if (!entry) {
|
|
ret = -ENOMEM;
|
|
goto unwind_interfaces;
|
|
}
|
|
|
|
entry->smp2p = smp2p;
|
|
spin_lock_init(&entry->lock);
|
|
|
|
ret = of_property_read_string(node, "qcom,entry-name", &entry->name);
|
|
if (ret < 0)
|
|
goto unwind_interfaces;
|
|
|
|
if (of_property_read_bool(node, "interrupt-controller")) {
|
|
ret = qcom_smp2p_inbound_entry(smp2p, entry, node);
|
|
if (ret < 0)
|
|
goto unwind_interfaces;
|
|
|
|
list_add(&entry->node, &smp2p->inbound);
|
|
} else {
|
|
ret = qcom_smp2p_outbound_entry(smp2p, entry, node);
|
|
if (ret < 0)
|
|
goto unwind_interfaces;
|
|
|
|
list_add(&entry->node, &smp2p->outbound);
|
|
}
|
|
}
|
|
|
|
/* Kick the outgoing edge after allocating entries */
|
|
qcom_smp2p_kick(smp2p);
|
|
|
|
ret = devm_request_threaded_irq(&pdev->dev, irq,
|
|
NULL, qcom_smp2p_intr,
|
|
IRQF_ONESHOT,
|
|
"smp2p", (void *)smp2p);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to request interrupt\n");
|
|
goto unwind_interfaces;
|
|
}
|
|
|
|
|
|
return 0;
|
|
|
|
unwind_interfaces:
|
|
list_for_each_entry(entry, &smp2p->inbound, node)
|
|
irq_domain_remove(entry->domain);
|
|
|
|
list_for_each_entry(entry, &smp2p->outbound, node)
|
|
qcom_smem_state_unregister(entry->state);
|
|
|
|
smp2p->out->valid_entries = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int qcom_smp2p_remove(struct platform_device *pdev)
|
|
{
|
|
struct qcom_smp2p *smp2p = platform_get_drvdata(pdev);
|
|
struct smp2p_entry *entry;
|
|
|
|
list_for_each_entry(entry, &smp2p->inbound, node)
|
|
irq_domain_remove(entry->domain);
|
|
|
|
list_for_each_entry(entry, &smp2p->outbound, node)
|
|
qcom_smem_state_unregister(entry->state);
|
|
|
|
smp2p->out->valid_entries = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id qcom_smp2p_of_match[] = {
|
|
{ .compatible = "qcom,smp2p" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, qcom_smp2p_of_match);
|
|
|
|
static struct platform_driver qcom_smp2p_driver = {
|
|
.probe = qcom_smp2p_probe,
|
|
.remove = qcom_smp2p_remove,
|
|
.driver = {
|
|
.name = "qcom_smp2p",
|
|
.of_match_table = qcom_smp2p_of_match,
|
|
},
|
|
};
|
|
module_platform_driver(qcom_smp2p_driver);
|
|
|
|
MODULE_DESCRIPTION("Qualcomm Shared Memory Point to Point driver");
|
|
MODULE_LICENSE("GPL v2");
|