Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 | /*
* Allwinner SoCs SRAM Controller Driver
*
* Copyright (C) 2015 Maxime Ripard
*
* Author: Maxime Ripard <maxime.ripard@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/soc/sunxi/sunxi_sram.h>
struct sunxi_sram_func {
char *func;
u8 val;
};
struct sunxi_sram_data {
char *name;
u8 reg;
u8 offset;
u8 width;
struct sunxi_sram_func *func;
struct list_head list;
};
struct sunxi_sram_desc {
struct sunxi_sram_data data;
bool claimed;
};
#define SUNXI_SRAM_MAP(_val, _func) \
{ \
.func = _func, \
.val = _val, \
}
#define SUNXI_SRAM_DATA(_name, _reg, _off, _width, ...) \
{ \
.name = _name, \
.reg = _reg, \
.offset = _off, \
.width = _width, \
.func = (struct sunxi_sram_func[]){ \
__VA_ARGS__, { } }, \
}
static struct sunxi_sram_desc sun4i_a10_sram_a3_a4 = {
.data = SUNXI_SRAM_DATA("A3-A4", 0x4, 0x4, 2,
SUNXI_SRAM_MAP(0, "cpu"),
SUNXI_SRAM_MAP(1, "emac")),
};
static struct sunxi_sram_desc sun4i_a10_sram_d = {
.data = SUNXI_SRAM_DATA("D", 0x4, 0x0, 1,
SUNXI_SRAM_MAP(0, "cpu"),
SUNXI_SRAM_MAP(1, "usb-otg")),
};
static const struct of_device_id sunxi_sram_dt_ids[] = {
{
.compatible = "allwinner,sun4i-a10-sram-a3-a4",
.data = &sun4i_a10_sram_a3_a4.data,
},
{
.compatible = "allwinner,sun4i-a10-sram-d",
.data = &sun4i_a10_sram_d.data,
},
{}
};
static struct device *sram_dev;
static LIST_HEAD(claimed_sram);
static DEFINE_SPINLOCK(sram_lock);
static void __iomem *base;
static int sunxi_sram_show(struct seq_file *s, void *data)
{
struct device_node *sram_node, *section_node;
const struct sunxi_sram_data *sram_data;
const struct of_device_id *match;
struct sunxi_sram_func *func;
const __be32 *sram_addr_p, *section_addr_p;
u32 val;
seq_puts(s, "Allwinner sunXi SRAM\n");
seq_puts(s, "--------------------\n\n");
for_each_child_of_node(sram_dev->of_node, sram_node) {
sram_addr_p = of_get_address(sram_node, 0, NULL, NULL);
seq_printf(s, "sram@%08x\n",
be32_to_cpu(*sram_addr_p));
for_each_child_of_node(sram_node, section_node) {
match = of_match_node(sunxi_sram_dt_ids, section_node);
if (!match)
continue;
sram_data = match->data;
section_addr_p = of_get_address(section_node, 0,
NULL, NULL);
seq_printf(s, "\tsection@%04x\t(%s)\n",
be32_to_cpu(*section_addr_p),
sram_data->name);
val = readl(base + sram_data->reg);
val >>= sram_data->offset;
val &= sram_data->width;
for (func = sram_data->func; func->func; func++) {
seq_printf(s, "\t\t%s%c\n", func->func,
func->val == val ? '*' : ' ');
}
}
seq_puts(s, "\n");
}
return 0;
}
static int sunxi_sram_open(struct inode *inode, struct file *file)
{
return single_open(file, sunxi_sram_show, inode->i_private);
}
static const struct file_operations sunxi_sram_fops = {
.open = sunxi_sram_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static inline struct sunxi_sram_desc *to_sram_desc(const struct sunxi_sram_data *data)
{
return container_of(data, struct sunxi_sram_desc, data);
}
static const struct sunxi_sram_data *sunxi_sram_of_parse(struct device_node *node,
unsigned int *value)
{
const struct of_device_id *match;
struct of_phandle_args args;
int ret;
ret = of_parse_phandle_with_fixed_args(node, "allwinner,sram", 1, 0,
&args);
if (ret)
return ERR_PTR(ret);
if (!of_device_is_available(args.np)) {
ret = -EBUSY;
goto err;
}
if (value)
*value = args.args[0];
match = of_match_node(sunxi_sram_dt_ids, args.np);
if (!match) {
ret = -EINVAL;
goto err;
}
of_node_put(args.np);
return match->data;
err:
of_node_put(args.np);
return ERR_PTR(ret);
}
int sunxi_sram_claim(struct device *dev)
{
const struct sunxi_sram_data *sram_data;
struct sunxi_sram_desc *sram_desc;
unsigned int device;
u32 val, mask;
if (IS_ERR(base))
return -EPROBE_DEFER;
if (!dev || !dev->of_node)
return -EINVAL;
sram_data = sunxi_sram_of_parse(dev->of_node, &device);
if (IS_ERR(sram_data))
return PTR_ERR(sram_data);
sram_desc = to_sram_desc(sram_data);
spin_lock(&sram_lock);
if (sram_desc->claimed) {
spin_unlock(&sram_lock);
return -EBUSY;
}
mask = GENMASK(sram_data->offset + sram_data->width, sram_data->offset);
val = readl(base + sram_data->reg);
val &= ~mask;
writel(val | ((device << sram_data->offset) & mask),
base + sram_data->reg);
spin_unlock(&sram_lock);
return 0;
}
EXPORT_SYMBOL(sunxi_sram_claim);
int sunxi_sram_release(struct device *dev)
{
const struct sunxi_sram_data *sram_data;
struct sunxi_sram_desc *sram_desc;
if (!dev || !dev->of_node)
return -EINVAL;
sram_data = sunxi_sram_of_parse(dev->of_node, NULL);
if (IS_ERR(sram_data))
return -EINVAL;
sram_desc = to_sram_desc(sram_data);
spin_lock(&sram_lock);
sram_desc->claimed = false;
spin_unlock(&sram_lock);
return 0;
}
EXPORT_SYMBOL(sunxi_sram_release);
static int sunxi_sram_probe(struct platform_device *pdev)
{
struct resource *res;
struct dentry *d;
sram_dev = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
d = debugfs_create_file("sram", S_IRUGO, NULL, NULL,
&sunxi_sram_fops);
if (!d)
return -ENOMEM;
return 0;
}
static const struct of_device_id sunxi_sram_dt_match[] = {
{ .compatible = "allwinner,sun4i-a10-sram-controller" },
{ },
};
MODULE_DEVICE_TABLE(of, sunxi_sram_dt_match);
static struct platform_driver sunxi_sram_driver = {
.driver = {
.name = "sunxi-sram",
.of_match_table = sunxi_sram_dt_match,
},
.probe = sunxi_sram_probe,
};
module_platform_driver(sunxi_sram_driver);
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner sunXi SRAM Controller Driver");
MODULE_LICENSE("GPL");
|