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- // 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, "l2 cache wait command timeout\n");
- 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, "l2 cache %uK, %u-way, %ubyte cache line, %ubit external bus\n",
- 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)
- {
- }
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