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
lima_l2_cache_wait_idle(struct lima_ip * ip)14 static 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
lima_l2_cache_flush(struct lima_ip * ip)30 int 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
lima_l2_cache_hw_init(struct lima_ip * ip)41 static int lima_l2_cache_hw_init(struct lima_ip *ip)
42 {
43 int err;
44
45 err = lima_l2_cache_flush(ip);
46 if (err)
47 return err;
48
49 l2_cache_write(LIMA_L2_CACHE_ENABLE,
50 LIMA_L2_CACHE_ENABLE_ACCESS |
51 LIMA_L2_CACHE_ENABLE_READ_ALLOCATE);
52 l2_cache_write(LIMA_L2_CACHE_MAX_READS, 0x1c);
53
54 return 0;
55 }
56
lima_l2_cache_resume(struct lima_ip * ip)57 int lima_l2_cache_resume(struct lima_ip *ip)
58 {
59 return lima_l2_cache_hw_init(ip);
60 }
61
lima_l2_cache_suspend(struct lima_ip * ip)62 void lima_l2_cache_suspend(struct lima_ip *ip)
63 {
64
65 }
66
lima_l2_cache_init(struct lima_ip * ip)67 int lima_l2_cache_init(struct lima_ip *ip)
68 {
69 int i;
70 u32 size;
71 struct lima_device *dev = ip->dev;
72
73 /* l2_cache2 only exists when one of PP4-7 present */
74 if (ip->id == lima_ip_l2_cache2) {
75 for (i = lima_ip_pp4; i <= lima_ip_pp7; i++) {
76 if (dev->ip[i].present)
77 break;
78 }
79 if (i > lima_ip_pp7)
80 return -ENODEV;
81 }
82
83 spin_lock_init(&ip->data.lock);
84
85 size = l2_cache_read(LIMA_L2_CACHE_SIZE);
86 dev_info(dev->dev, "l2 cache %uK, %u-way, %ubyte cache line, %ubit external bus\n",
87 1 << (((size >> 16) & 0xff) - 10),
88 1 << ((size >> 8) & 0xff),
89 1 << (size & 0xff),
90 1 << ((size >> 24) & 0xff));
91
92 return lima_l2_cache_hw_init(ip);
93 }
94
lima_l2_cache_fini(struct lima_ip * ip)95 void lima_l2_cache_fini(struct lima_ip *ip)
96 {
97
98 }
99