// SPDX-License-Identifier: GPL-2.0 OR MIT
/* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */

#include <linux/iopoll.h>
#include <linux/device.h>

#include "lima_device.h"
#include "lima_l2_cache.h"
#include "lima_regs.h"

#define l2_cache_write(reg, data) writel(data, ip->iomem + reg)
#define l2_cache_read(reg) readl(ip->iomem + reg)

static int lima_l2_cache_wait_idle(struct lima_ip *ip)
{
        struct lima_device *dev = ip->dev;
        int err;
        u32 v;

        err = readl_poll_timeout(ip->iomem + LIMA_L2_CACHE_STATUS, v,
                                 !(v & LIMA_L2_CACHE_STATUS_COMMAND_BUSY),
                                 0, 1000);
        if (err) {
                dev_err(dev->dev, "%s wait command timeout\n",
                        lima_ip_name(ip));
                return err;
        }
        return 0;
}

int lima_l2_cache_flush(struct lima_ip *ip)
{
        int ret;

        spin_lock(&ip->data.lock);
        l2_cache_write(LIMA_L2_CACHE_COMMAND, LIMA_L2_CACHE_COMMAND_CLEAR_ALL);
        ret = lima_l2_cache_wait_idle(ip);
        spin_unlock(&ip->data.lock);
        return ret;
}

static int lima_l2_cache_hw_init(struct lima_ip *ip)
{
        int err;

        err = lima_l2_cache_flush(ip);
        if (err)
                return err;

        l2_cache_write(LIMA_L2_CACHE_ENABLE,
                       LIMA_L2_CACHE_ENABLE_ACCESS |
                       LIMA_L2_CACHE_ENABLE_READ_ALLOCATE);
        l2_cache_write(LIMA_L2_CACHE_MAX_READS, 0x1c);

        return 0;
}

int lima_l2_cache_resume(struct lima_ip *ip)
{
        return lima_l2_cache_hw_init(ip);
}

void lima_l2_cache_suspend(struct lima_ip *ip)
{

}

int lima_l2_cache_init(struct lima_ip *ip)
{
        int i;
        u32 size;
        struct lima_device *dev = ip->dev;

        /* l2_cache2 only exists when one of PP4-7 present */
        if (ip->id == lima_ip_l2_cache2) {
                for (i = lima_ip_pp4; i <= lima_ip_pp7; i++) {
                        if (dev->ip[i].present)
                                break;
                }
                if (i > lima_ip_pp7)
                        return -ENODEV;
        }

        spin_lock_init(&ip->data.lock);

        size = l2_cache_read(LIMA_L2_CACHE_SIZE);
        dev_info(dev->dev, "%s %uK, %u-way, %ubyte cache line, %ubit external bus\n",
                 lima_ip_name(ip),
                 1 << (((size >> 16) & 0xff) - 10),
                 1 << ((size >> 8) & 0xff),
                 1 << (size & 0xff),
                 1 << ((size >> 24) & 0xff));

        return lima_l2_cache_hw_init(ip);
}

void lima_l2_cache_fini(struct lima_ip *ip)
{

}