1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2021 SiFive
4 */
5
6 #include <common.h>
7 #include <cache.h>
8 #include <dm.h>
9 #include <asm/io.h>
10 #include <dm/device.h>
11 #include <linux/bitfield.h>
12
13 #define SIFIVE_CCACHE_CONFIG 0x000
14 #define SIFIVE_CCACHE_CONFIG_WAYS GENMASK(15, 8)
15
16 #define SIFIVE_CCACHE_WAY_ENABLE 0x008
17
18 struct sifive_ccache {
19 void __iomem *base;
20 };
21
sifive_ccache_enable(struct udevice * dev)22 static int sifive_ccache_enable(struct udevice *dev)
23 {
24 struct sifive_ccache *priv = dev_get_priv(dev);
25 u32 config;
26 u32 ways;
27
28 /* Enable all ways of composable cache */
29 config = readl(priv->base + SIFIVE_CCACHE_CONFIG);
30 ways = FIELD_GET(SIFIVE_CCACHE_CONFIG_WAYS, config);
31
32 writel(ways - 1, priv->base + SIFIVE_CCACHE_WAY_ENABLE);
33
34 return 0;
35 }
36
sifive_ccache_get_info(struct udevice * dev,struct cache_info * info)37 static int sifive_ccache_get_info(struct udevice *dev, struct cache_info *info)
38 {
39 struct sifive_ccache *priv = dev_get_priv(dev);
40
41 info->base = (uintptr_t)priv->base;
42
43 return 0;
44 }
45
46 static const struct cache_ops sifive_ccache_ops = {
47 .enable = sifive_ccache_enable,
48 .get_info = sifive_ccache_get_info,
49 };
50
sifive_ccache_probe(struct udevice * dev)51 static int sifive_ccache_probe(struct udevice *dev)
52 {
53 struct sifive_ccache *priv = dev_get_priv(dev);
54
55 priv->base = dev_read_addr_ptr(dev);
56 if (!priv->base)
57 return -EINVAL;
58
59 return 0;
60 }
61
62 static const struct udevice_id sifive_ccache_ids[] = {
63 { .compatible = "sifive,fu540-c000-ccache" },
64 { .compatible = "sifive,fu740-c000-ccache" },
65 { .compatible = "sifive,ccache0" },
66 {}
67 };
68
69 U_BOOT_DRIVER(sifive_ccache) = {
70 .name = "sifive_ccache",
71 .id = UCLASS_CACHE,
72 .of_match = sifive_ccache_ids,
73 .probe = sifive_ccache_probe,
74 .priv_auto = sizeof(struct sifive_ccache),
75 .ops = &sifive_ccache_ops,
76 };
77