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/*
* Copyright (c) 2018, 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.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/reset-controller.h>
#include <linux/clk/msm-clk.h>
#include <linux/habmm.h>
#include "virt-reset-front.h"
#include "virtclk-front.h"
static int virtrc_front_get_clk_id(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct virtrc_front *rst;
struct virt_reset_map *map;
struct clk_msg_getid msg;
struct clk_msg_rsp rsp;
u32 rsp_size = sizeof(rsp);
int handle;
int ret = 0;
rst = to_virtrc_front(rcdev);
map = &rst->reset_map[id];
msg.header.cmd = CLK_MSG_GETID;
msg.header.len = sizeof(msg);
strlcpy(msg.name, map->clk_name, sizeof(msg.name));
rt_mutex_lock(&virtclk_front_ctx.lock);
handle = virtclk_front_ctx.handle;
ret = habmm_socket_send(handle, &msg, sizeof(msg), 0);
if (ret) {
pr_err("%s: habmm socket send failed (%d)\n", map->clk_name,
ret);
goto err_out;
}
ret = habmm_socket_recv(handle, &rsp, &rsp_size, UINT_MAX,
HABMM_SOCKET_RECV_FLAGS_UNINTERRUPTIBLE);
if (ret) {
pr_err("%s: habmm socket receive failed (%d)\n", map->clk_name,
ret);
goto err_out;
}
if (rsp.rsp) {
pr_err("%s: error response (%d)\n", map->clk_name, rsp.rsp);
ret = -EIO;
} else
map->clk_id = rsp.header.clk_id;
rt_mutex_unlock(&virtclk_front_ctx.lock);
return ret;
err_out:
habmm_socket_close(handle);
virtclk_front_ctx.handle = 0;
rt_mutex_unlock(&virtclk_front_ctx.lock);
return ret;
}
static int __virtrc_front_reset(struct reset_controller_dev *rcdev,
unsigned long id, enum clk_reset_action action)
{
struct virtrc_front *rst;
struct virt_reset_map *map;
struct clk_msg_reset msg;
struct clk_msg_rsp rsp;
u32 rsp_size = sizeof(rsp);
int handle;
int ret = 0;
rst = to_virtrc_front(rcdev);
map = &rst->reset_map[id];
ret = virtclk_front_init_iface();
if (ret)
return ret;
ret = virtrc_front_get_clk_id(rcdev, id);
if (ret)
return ret;
msg.header.clk_id = map->clk_id;
msg.header.cmd = CLK_MSG_RESET;
msg.header.len = sizeof(struct clk_msg_header);
msg.reset = action;
rt_mutex_lock(&virtclk_front_ctx.lock);
handle = virtclk_front_ctx.handle;
ret = habmm_socket_send(handle, &msg, sizeof(msg), 0);
if (ret) {
pr_err("%s: habmm socket send failed (%d)\n", map->clk_name,
ret);
goto err_out;
}
ret = habmm_socket_recv(handle, &rsp, &rsp_size, UINT_MAX,
HABMM_SOCKET_RECV_FLAGS_UNINTERRUPTIBLE);
if (ret) {
pr_err("%s: habmm socket receive failed (%d)\n", map->clk_name,
ret);
goto err_out;
}
if (rsp.rsp) {
pr_err("%s: error response (%d)\n", map->clk_name, rsp.rsp);
ret = -EIO;
}
rt_mutex_unlock(&virtclk_front_ctx.lock);
pr_debug("%s(%lu): do %s\n", map->clk_name, id,
action == CLK_RESET_ASSERT ? "assert" : "deassert");
return ret;
err_out:
habmm_socket_close(handle);
virtclk_front_ctx.handle = 0;
rt_mutex_unlock(&virtclk_front_ctx.lock);
return ret;
}
static int virtrc_front_reset(struct reset_controller_dev *rcdev,
unsigned long id)
{
int ret = 0;
ret = __virtrc_front_reset(rcdev, id, CLK_RESET_ASSERT);
if (ret)
return ret;
udelay(1);
return __virtrc_front_reset(rcdev, id, CLK_RESET_DEASSERT);
}
static int virtrc_front_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return __virtrc_front_reset(rcdev, id, CLK_RESET_ASSERT);
}
static int virtrc_front_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return __virtrc_front_reset(rcdev, id, CLK_RESET_DEASSERT);
}
struct reset_control_ops virtrc_front_ops = {
.reset = virtrc_front_reset,
.assert = virtrc_front_reset_assert,
.deassert = virtrc_front_reset_deassert,
};
int msm_virtrc_front_register(struct platform_device *pdev,
struct virt_reset_map *map, unsigned int num_resets)
{
struct virtrc_front *reset;
int ret = 0;
reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);
if (!reset)
return -ENOMEM;
reset->rcdev.of_node = pdev->dev.of_node;
reset->rcdev.ops = &virtrc_front_ops;
reset->rcdev.owner = pdev->dev.driver->owner;
reset->rcdev.nr_resets = num_resets;
reset->reset_map = map;
ret = reset_controller_register(&reset->rcdev);
if (ret)
dev_err(&pdev->dev, "Failed to register with reset controller\n");
return ret;
}
EXPORT_SYMBOL(msm_virtrc_front_register);
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