tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */
3
4#include <linux/iopoll.h>
5#include <linux/device.h>
6
7#include "lima_device.h"
8#include "lima_l2_cache.h"
9#include "lima_regs.h"
10
11#define l2_cache_write(reg, data) writel(data, ip->iomem + reg)
12#define l2_cache_read(reg) readl(ip->iomem + reg)
13
14static int lima_l2_cache_wait_idle(struct lima_ip *ip)
15{
16 struct lima_device *dev = ip->dev;
17 int err;
18 u32 v;
19
20 err = readl_poll_timeout(ip->iomem + LIMA_L2_CACHE_STATUS, v,
21 !(v & LIMA_L2_CACHE_STATUS_COMMAND_BUSY),
22 0, 1000);
23 if (err) {
24 dev_err(dev->dev, "l2 cache wait command timeout\n");
25 return err;
26 }
27 return 0;
28}
29
30int lima_l2_cache_flush(struct lima_ip *ip)
31{
32 int ret;
33
34 spin_lock(&ip->data.lock);
35 l2_cache_write(LIMA_L2_CACHE_COMMAND, LIMA_L2_CACHE_COMMAND_CLEAR_ALL);
36 ret = lima_l2_cache_wait_idle(ip);
37 spin_unlock(&ip->data.lock);
38 return ret;
39}
40
41int lima_l2_cache_init(struct lima_ip *ip)
42{
43 int i, err;
44 u32 size;
45 struct lima_device *dev = ip->dev;
46
47 /* l2_cache2 only exists when one of PP4-7 present */
48 if (ip->id == lima_ip_l2_cache2) {
49 for (i = lima_ip_pp4; i <= lima_ip_pp7; i++) {
50 if (dev->ip[i].present)
51 break;
52 }
53 if (i > lima_ip_pp7)
54 return -ENODEV;
55 }
56
57 spin_lock_init(&ip->data.lock);
58
59 size = l2_cache_read(LIMA_L2_CACHE_SIZE);
60 dev_info(dev->dev, "l2 cache %uK, %u-way, %ubyte cache line, %ubit external bus\n",
61 1 << (((size >> 16) & 0xff) - 10),
62 1 << ((size >> 8) & 0xff),
63 1 << (size & 0xff),
64 1 << ((size >> 24) & 0xff));
65
66 err = lima_l2_cache_flush(ip);
67 if (err)
68 return err;
69
70 l2_cache_write(LIMA_L2_CACHE_ENABLE,
71 LIMA_L2_CACHE_ENABLE_ACCESS|LIMA_L2_CACHE_ENABLE_READ_ALLOCATE);
72 l2_cache_write(LIMA_L2_CACHE_MAX_READS, 0x1c);
73
74 return 0;
75}
76
77void lima_l2_cache_fini(struct lima_ip *ip)
78{
79
80}