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/*
* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
*/
#define pr_fmt(fmt) "%s " fmt, KBUILD_MODNAME
#include <linux/atomic.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <soc/qcom/cmd-db.h>
#include <soc/qcom/tcs.h>
#include <dt-bindings/soc/qcom,rpmh-rsc.h>
#include "rpmh-internal.h"
#define CREATE_TRACE_POINTS
#include "trace-rpmh.h"
#define RSC_DRV_TCS_OFFSET 672
#define RSC_DRV_CMD_OFFSET 20
/* DRV Configuration Information Register */
#define DRV_PRNT_CHLD_CONFIG 0x0C
#define DRV_NUM_TCS_MASK 0x3F
#define DRV_NUM_TCS_SHIFT 6
#define DRV_NCPT_MASK 0x1F
#define DRV_NCPT_SHIFT 27
/* Register offsets */
#define RSC_DRV_IRQ_ENABLE 0x00
#define RSC_DRV_IRQ_STATUS 0x04
#define RSC_DRV_IRQ_CLEAR 0x08
#define RSC_DRV_CMD_WAIT_FOR_CMPL 0x10
#define RSC_DRV_CONTROL 0x14
#define RSC_DRV_STATUS 0x18
#define RSC_DRV_CMD_ENABLE 0x1C
#define RSC_DRV_CMD_MSGID 0x30
#define RSC_DRV_CMD_ADDR 0x34
#define RSC_DRV_CMD_DATA 0x38
#define RSC_DRV_CMD_STATUS 0x3C
#define RSC_DRV_CMD_RESP_DATA 0x40
#define TCS_AMC_MODE_ENABLE BIT(16)
#define TCS_AMC_MODE_TRIGGER BIT(24)
/* TCS CMD register bit mask */
#define CMD_MSGID_LEN 8
#define CMD_MSGID_RESP_REQ BIT(8)
#define CMD_MSGID_WRITE BIT(16)
#define CMD_STATUS_ISSUED BIT(8)
#define CMD_STATUS_COMPL BIT(16)
static u32 read_tcs_reg(struct rsc_drv *drv, int reg, int tcs_id, int cmd_id)
{
return readl_relaxed(drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * tcs_id +
RSC_DRV_CMD_OFFSET * cmd_id);
}
static void write_tcs_cmd(struct rsc_drv *drv, int reg, int tcs_id, int cmd_id,
u32 data)
{
writel_relaxed(data, drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * tcs_id +
RSC_DRV_CMD_OFFSET * cmd_id);
}
static void write_tcs_reg(struct rsc_drv *drv, int reg, int tcs_id, u32 data)
{
writel_relaxed(data, drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * tcs_id);
}
static void write_tcs_reg_sync(struct rsc_drv *drv, int reg, int tcs_id,
u32 data)
{
writel(data, drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * tcs_id);
for (;;) {
if (data == readl(drv->tcs_base + reg +
RSC_DRV_TCS_OFFSET * tcs_id))
break;
udelay(1);
}
}
static bool tcs_is_free(struct rsc_drv *drv, int tcs_id)
{
return !test_bit(tcs_id, drv->tcs_in_use) &&
read_tcs_reg(drv, RSC_DRV_STATUS, tcs_id, 0);
}
static struct tcs_group *get_tcs_of_type(struct rsc_drv *drv, int type)
{
return &drv->tcs[type];
}
static int tcs_invalidate(struct rsc_drv *drv, int type)
{
int m;
struct tcs_group *tcs;
tcs = get_tcs_of_type(drv, type);
spin_lock(&tcs->lock);
if (bitmap_empty(tcs->slots, MAX_TCS_SLOTS)) {
spin_unlock(&tcs->lock);
return 0;
}
for (m = tcs->offset; m < tcs->offset + tcs->num_tcs; m++) {
if (!tcs_is_free(drv, m)) {
spin_unlock(&tcs->lock);
return -EAGAIN;
}
write_tcs_reg_sync(drv, RSC_DRV_CMD_ENABLE, m, 0);
write_tcs_reg_sync(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, m, 0);
}
bitmap_zero(tcs->slots, MAX_TCS_SLOTS);
spin_unlock(&tcs->lock);
return 0;
}
/**
* rpmh_rsc_invalidate - Invalidate sleep and wake TCSes
*
* @drv: the RSC controller
*/
int rpmh_rsc_invalidate(struct rsc_drv *drv)
{
int ret;
ret = tcs_invalidate(drv, SLEEP_TCS);
if (!ret)
ret = tcs_invalidate(drv, WAKE_TCS);
return ret;
}
static struct tcs_group *get_tcs_for_msg(struct rsc_drv *drv,
const struct tcs_request *msg)
{
int type;
struct tcs_group *tcs;
switch (msg->state) {
case RPMH_ACTIVE_ONLY_STATE:
type = ACTIVE_TCS;
break;
case RPMH_WAKE_ONLY_STATE:
type = WAKE_TCS;
break;
case RPMH_SLEEP_STATE:
type = SLEEP_TCS;
break;
default:
return ERR_PTR(-EINVAL);
}
/*
* If we are making an active request on a RSC that does not have a
* dedicated TCS for active state use, then re-purpose a wake TCS to
* send active votes.
*/
tcs = get_tcs_of_type(drv, type);
if (msg->state == RPMH_ACTIVE_ONLY_STATE && !tcs->num_tcs)
tcs = get_tcs_of_type(drv, WAKE_TCS);
return tcs;
}
static const struct tcs_request *get_req_from_tcs(struct rsc_drv *drv,
int tcs_id)
{
struct tcs_group *tcs;
int i;
for (i = 0; i < TCS_TYPE_NR; i++) {
tcs = &drv->tcs[i];
if (tcs->mask & BIT(tcs_id))
return tcs->req[tcs_id - tcs->offset];
}
return NULL;
}
static void __tcs_set_trigger(struct rsc_drv *drv, int tcs_id, bool trigger)
{
u32 enable;
/*
* HW req: Clear the DRV_CONTROL and enable TCS again
* While clearing ensure that the AMC mode trigger is cleared
* and then the mode enable is cleared.
*/
enable = read_tcs_reg(drv, RSC_DRV_CONTROL, tcs_id, 0);
enable &= ~TCS_AMC_MODE_TRIGGER;
write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
enable &= ~TCS_AMC_MODE_ENABLE;
write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
if (trigger) {
/* Enable the AMC mode on the TCS and then trigger the TCS */
enable = TCS_AMC_MODE_ENABLE;
write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
enable |= TCS_AMC_MODE_TRIGGER;
write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
}
}
static void enable_tcs_irq(struct rsc_drv *drv, int tcs_id, bool enable)
{
u32 data;
data = read_tcs_reg(drv, RSC_DRV_IRQ_ENABLE, 0, 0);
if (enable)
data |= BIT(tcs_id);
else
data &= ~BIT(tcs_id);
write_tcs_reg(drv, RSC_DRV_IRQ_ENABLE, 0, data);
}
/**
* tcs_tx_done: TX Done interrupt handler
*/
static irqreturn_t tcs_tx_done(int irq, void *p)
{
struct rsc_drv *drv = p;
int i, j, err = 0;
unsigned long irq_status;
const struct tcs_request *req;
struct tcs_cmd *cmd;
irq_status = read_tcs_reg(drv, RSC_DRV_IRQ_STATUS, 0, 0);
for_each_set_bit(i, &irq_status, BITS_PER_LONG) {
req = get_req_from_tcs(drv, i);
if (!req) {
WARN_ON(1);
goto skip;
}
err = 0;
for (j = 0; j < req->num_cmds; j++) {
u32 sts;
cmd = &req->cmds[j];
sts = read_tcs_reg(drv, RSC_DRV_CMD_STATUS, i, j);
if (!(sts & CMD_STATUS_ISSUED) ||
((req->wait_for_compl || cmd->wait) &&
!(sts & CMD_STATUS_COMPL))) {
pr_err("Incomplete request: %s: addr=%#x data=%#x",
drv->name, cmd->addr, cmd->data);
err = -EIO;
}
}
trace_rpmh_tx_done(drv, i, req, err);
/*
* If wake tcs was re-purposed for sending active
* votes, clear AMC trigger & enable modes and
* disable interrupt for this TCS
*/
if (!drv->tcs[ACTIVE_TCS].num_tcs)
__tcs_set_trigger(drv, i, false);
skip:
/* Reclaim the TCS */
write_tcs_reg(drv, RSC_DRV_CMD_ENABLE, i, 0);
write_tcs_reg(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, i, 0);
write_tcs_reg(drv, RSC_DRV_IRQ_CLEAR, 0, BIT(i));
spin_lock(&drv->lock);
clear_bit(i, drv->tcs_in_use);
/*
* Disable interrupt for WAKE TCS to avoid being
* spammed with interrupts coming when the solver
* sends its wake votes.
*/
if (!drv->tcs[ACTIVE_TCS].num_tcs)
enable_tcs_irq(drv, i, false);
spin_unlock(&drv->lock);
if (req)
rpmh_tx_done(req, err);
}
return IRQ_HANDLED;
}
static void __tcs_buffer_write(struct rsc_drv *drv, int tcs_id, int cmd_id,
const struct tcs_request *msg)
{
u32 msgid, cmd_msgid;
u32 cmd_enable = 0;
u32 cmd_complete;
struct tcs_cmd *cmd;
int i, j;
cmd_msgid = CMD_MSGID_LEN;
cmd_msgid |= msg->wait_for_compl ? CMD_MSGID_RESP_REQ : 0;
cmd_msgid |= CMD_MSGID_WRITE;
cmd_complete = read_tcs_reg(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, tcs_id, 0);
for (i = 0, j = cmd_id; i < msg->num_cmds; i++, j++) {
cmd = &msg->cmds[i];
cmd_enable |= BIT(j);
cmd_complete |= cmd->wait << j;
msgid = cmd_msgid;
msgid |= cmd->wait ? CMD_MSGID_RESP_REQ : 0;
write_tcs_cmd(drv, RSC_DRV_CMD_MSGID, tcs_id, j, msgid);
write_tcs_cmd(drv, RSC_DRV_CMD_ADDR, tcs_id, j, cmd->addr);
write_tcs_cmd(drv, RSC_DRV_CMD_DATA, tcs_id, j, cmd->data);
trace_rpmh_send_msg(drv, tcs_id, j, msgid, cmd);
}
write_tcs_reg(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, tcs_id, cmd_complete);
cmd_enable |= read_tcs_reg(drv, RSC_DRV_CMD_ENABLE, tcs_id, 0);
write_tcs_reg(drv, RSC_DRV_CMD_ENABLE, tcs_id, cmd_enable);
}
static int check_for_req_inflight(struct rsc_drv *drv, struct tcs_group *tcs,
const struct tcs_request *msg)
{
unsigned long curr_enabled;
u32 addr;
int i, j, k;
int tcs_id = tcs->offset;
for (i = 0; i < tcs->num_tcs; i++, tcs_id++) {
if (tcs_is_free(drv, tcs_id))
continue;
curr_enabled = read_tcs_reg(drv, RSC_DRV_CMD_ENABLE, tcs_id, 0);
for_each_set_bit(j, &curr_enabled, MAX_CMDS_PER_TCS) {
addr = read_tcs_reg(drv, RSC_DRV_CMD_ADDR, tcs_id, j);
for (k = 0; k < msg->num_cmds; k++) {
if (addr == msg->cmds[k].addr)
return -EBUSY;
}
}
}
return 0;
}
static int find_free_tcs(struct tcs_group *tcs)
{
int i;
for (i = 0; i < tcs->num_tcs; i++) {
if (tcs_is_free(tcs->drv, tcs->offset + i))
return tcs->offset + i;
}
return -EBUSY;
}
static int tcs_write(struct rsc_drv *drv, const struct tcs_request *msg)
{
struct tcs_group *tcs;
int tcs_id;
unsigned long flags;
int ret;
tcs = get_tcs_for_msg(drv, msg);
if (IS_ERR(tcs))
return PTR_ERR(tcs);
spin_lock_irqsave(&tcs->lock, flags);
spin_lock(&drv->lock);
/*
* The h/w does not like if we send a request to the same address,
* when one is already in-flight or being processed.
*/
ret = check_for_req_inflight(drv, tcs, msg);
if (ret) {
spin_unlock(&drv->lock);
goto done_write;
}
tcs_id = find_free_tcs(tcs);
if (tcs_id < 0) {
ret = tcs_id;
spin_unlock(&drv->lock);
goto done_write;
}
tcs->req[tcs_id - tcs->offset] = msg;
set_bit(tcs_id, drv->tcs_in_use);
if (msg->state == RPMH_ACTIVE_ONLY_STATE && tcs->type != ACTIVE_TCS) {
/*
* Clear previously programmed WAKE commands in selected
* repurposed TCS to avoid triggering them. tcs->slots will be
* cleaned from rpmh_flush() by invoking rpmh_rsc_invalidate()
*/
write_tcs_reg_sync(drv, RSC_DRV_CMD_ENABLE, tcs_id, 0);
write_tcs_reg_sync(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, tcs_id, 0);
enable_tcs_irq(drv, tcs_id, true);
}
spin_unlock(&drv->lock);
__tcs_buffer_write(drv, tcs_id, 0, msg);
__tcs_set_trigger(drv, tcs_id, true);
done_write:
spin_unlock_irqrestore(&tcs->lock, flags);
return ret;
}
/**
* rpmh_rsc_send_data: Validate the incoming message and write to the
* appropriate TCS block.
*
* @drv: the controller
* @msg: the data to be sent
*
* Return: 0 on success, -EINVAL on error.
* Note: This call blocks until a valid data is written to the TCS.
*/
int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg)
{
int ret;
if (!msg || !msg->cmds || !msg->num_cmds ||
msg->num_cmds > MAX_RPMH_PAYLOAD) {
WARN_ON(1);
return -EINVAL;
}
do {
ret = tcs_write(drv, msg);
if (ret == -EBUSY) {
pr_info_ratelimited("TCS Busy, retrying RPMH message send: addr=%#x\n",
msg->cmds[0].addr);
udelay(10);
}
} while (ret == -EBUSY);
return ret;
}
static int find_match(const struct tcs_group *tcs, const struct tcs_cmd *cmd,
int len)
{
int i, j;
/* Check for already cached commands */
for_each_set_bit(i, tcs->slots, MAX_TCS_SLOTS) {
if (tcs->cmd_cache[i] != cmd[0].addr)
continue;
if (i + len >= tcs->num_tcs * tcs->ncpt)
goto seq_err;
for (j = 0; j < len; j++) {
if (tcs->cmd_cache[i + j] != cmd[j].addr)
goto seq_err;
}
return i;
}
return -ENODATA;
seq_err:
WARN(1, "Message does not match previous sequence.\n");
return -EINVAL;
}
static int find_slots(struct tcs_group *tcs, const struct tcs_request *msg,
int *tcs_id, int *cmd_id)
{
int slot, offset;
int i = 0;
/* Find if we already have the msg in our TCS */
slot = find_match(tcs, msg->cmds, msg->num_cmds);
if (slot >= 0)
goto copy_data;
/* Do over, until we can fit the full payload in a TCS */
do {
slot = bitmap_find_next_zero_area(tcs->slots, MAX_TCS_SLOTS,
i, msg->num_cmds, 0);
if (slot >= tcs->num_tcs * tcs->ncpt)
return -ENOMEM;
i += tcs->ncpt;
} while (slot + msg->num_cmds - 1 >= i);
copy_data:
bitmap_set(tcs->slots, slot, msg->num_cmds);
/* Copy the addresses of the resources over to the slots */
for (i = 0; i < msg->num_cmds; i++)
tcs->cmd_cache[slot + i] = msg->cmds[i].addr;
offset = slot / tcs->ncpt;
*tcs_id = offset + tcs->offset;
*cmd_id = slot % tcs->ncpt;
return 0;
}
static int tcs_ctrl_write(struct rsc_drv *drv, const struct tcs_request *msg)
{
struct tcs_group *tcs;
int tcs_id = 0, cmd_id = 0;
unsigned long flags;
int ret;
tcs = get_tcs_for_msg(drv, msg);
if (IS_ERR(tcs))
return PTR_ERR(tcs);
spin_lock_irqsave(&tcs->lock, flags);
/* find the TCS id and the command in the TCS to write to */
ret = find_slots(tcs, msg, &tcs_id, &cmd_id);
if (!ret)
__tcs_buffer_write(drv, tcs_id, cmd_id, msg);
spin_unlock_irqrestore(&tcs->lock, flags);
return ret;
}
/**
* rpmh_rsc_write_ctrl_data: Write request to the controller
*
* @drv: the controller
* @msg: the data to be written to the controller
*
* There is no response returned for writing the request to the controller.
*/
int rpmh_rsc_write_ctrl_data(struct rsc_drv *drv, const struct tcs_request *msg)
{
if (!msg || !msg->cmds || !msg->num_cmds ||
msg->num_cmds > MAX_RPMH_PAYLOAD) {
pr_err("Payload error\n");
return -EINVAL;
}
/* Data sent to this API will not be sent immediately */
if (msg->state == RPMH_ACTIVE_ONLY_STATE)
return -EINVAL;
return tcs_ctrl_write(drv, msg);
}
static int rpmh_probe_tcs_config(struct platform_device *pdev,
struct rsc_drv *drv)
{
struct tcs_type_config {
u32 type;
u32 n;
} tcs_cfg[TCS_TYPE_NR] = { { 0 } };
struct device_node *dn = pdev->dev.of_node;
u32 config, max_tcs, ncpt, offset;
int i, ret, n, st = 0;
struct tcs_group *tcs;
struct resource *res;
void __iomem *base;
char drv_id[10] = {0};
snprintf(drv_id, ARRAY_SIZE(drv_id), "drv-%d", drv->id);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, drv_id);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
ret = of_property_read_u32(dn, "qcom,tcs-offset", &offset);
if (ret)
return ret;
drv->tcs_base = base + offset;
config = readl_relaxed(base + DRV_PRNT_CHLD_CONFIG);
max_tcs = config;
max_tcs &= DRV_NUM_TCS_MASK << (DRV_NUM_TCS_SHIFT * drv->id);
max_tcs = max_tcs >> (DRV_NUM_TCS_SHIFT * drv->id);
ncpt = config & (DRV_NCPT_MASK << DRV_NCPT_SHIFT);
ncpt = ncpt >> DRV_NCPT_SHIFT;
n = of_property_count_u32_elems(dn, "qcom,tcs-config");
if (n != 2 * TCS_TYPE_NR)
return -EINVAL;
for (i = 0; i < TCS_TYPE_NR; i++) {
ret = of_property_read_u32_index(dn, "qcom,tcs-config",
i * 2, &tcs_cfg[i].type);
if (ret)
return ret;
if (tcs_cfg[i].type >= TCS_TYPE_NR)
return -EINVAL;
ret = of_property_read_u32_index(dn, "qcom,tcs-config",
i * 2 + 1, &tcs_cfg[i].n);
if (ret)
return ret;
if (tcs_cfg[i].n > MAX_TCS_PER_TYPE)
return -EINVAL;
}
for (i = 0; i < TCS_TYPE_NR; i++) {
tcs = &drv->tcs[tcs_cfg[i].type];
if (tcs->drv)
return -EINVAL;
tcs->drv = drv;
tcs->type = tcs_cfg[i].type;
tcs->num_tcs = tcs_cfg[i].n;
tcs->ncpt = ncpt;
spin_lock_init(&tcs->lock);
if (!tcs->num_tcs || tcs->type == CONTROL_TCS)
continue;
if (st + tcs->num_tcs > max_tcs ||
st + tcs->num_tcs >= BITS_PER_BYTE * sizeof(tcs->mask))
return -EINVAL;
tcs->mask = ((1 << tcs->num_tcs) - 1) << st;
tcs->offset = st;
st += tcs->num_tcs;
/*
* Allocate memory to cache sleep and wake requests to
* avoid reading TCS register memory.
*/
if (tcs->type == ACTIVE_TCS)
continue;
tcs->cmd_cache = devm_kcalloc(&pdev->dev,
tcs->num_tcs * ncpt, sizeof(u32),
GFP_KERNEL);
if (!tcs->cmd_cache)
return -ENOMEM;
}
drv->num_tcs = st;
return 0;
}
static int rpmh_rsc_probe(struct platform_device *pdev)
{
struct device_node *dn = pdev->dev.of_node;
struct rsc_drv *drv;
int ret, irq;
/*
* Even though RPMh doesn't directly use cmd-db, all of its children
* do. To avoid adding this check to our children we'll do it now.
*/
ret = cmd_db_ready();
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev, "Command DB not available (%d)\n",
ret);
return ret;
}
drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
if (!drv)
return -ENOMEM;
ret = of_property_read_u32(dn, "qcom,drv-id", &drv->id);
if (ret)
return ret;
drv->name = of_get_property(dn, "label", NULL);
if (!drv->name)
drv->name = dev_name(&pdev->dev);
ret = rpmh_probe_tcs_config(pdev, drv);
if (ret)
return ret;
spin_lock_init(&drv->lock);
bitmap_zero(drv->tcs_in_use, MAX_TCS_NR);
irq = platform_get_irq(pdev, drv->id);
if (irq < 0)
return irq;
ret = devm_request_irq(&pdev->dev, irq, tcs_tx_done,
IRQF_TRIGGER_HIGH | IRQF_NO_SUSPEND,
drv->name, drv);
if (ret)
return ret;
/* Enable the active TCS to send requests immediately */
write_tcs_reg(drv, RSC_DRV_IRQ_ENABLE, 0, drv->tcs[ACTIVE_TCS].mask);
spin_lock_init(&drv->client.cache_lock);
INIT_LIST_HEAD(&drv->client.cache);
INIT_LIST_HEAD(&drv->client.batch_cache);
dev_set_drvdata(&pdev->dev, drv);
return devm_of_platform_populate(&pdev->dev);
}
static const struct of_device_id rpmh_drv_match[] = {
{ .compatible = "qcom,rpmh-rsc", },
{ }
};
static struct platform_driver rpmh_driver = {
.probe = rpmh_rsc_probe,
.driver = {
.name = "rpmh",
.of_match_table = rpmh_drv_match,
.suppress_bind_attrs = true,
},
};
static int __init rpmh_driver_init(void)
{
return platform_driver_register(&rpmh_driver);
}
arch_initcall(rpmh_driver_init);
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