425 lines
9.5 KiB
C
425 lines
9.5 KiB
C
/*
|
|
* 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/regmap.h>
|
|
|
|
#include <linux/soc/sunxi/sunxi_sram.h>
|
|
|
|
struct sunxi_sram_func {
|
|
char *func;
|
|
u8 val;
|
|
u32 reg_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(_reg_val, _val, _func) \
|
|
{ \
|
|
.func = _func, \
|
|
.val = _val, \
|
|
.reg_val = _reg_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, 0, "cpu"),
|
|
SUNXI_SRAM_MAP(1, 1, "emac")),
|
|
};
|
|
|
|
static struct sunxi_sram_desc sun4i_a10_sram_c1 = {
|
|
.data = SUNXI_SRAM_DATA("C1", 0x0, 0x0, 31,
|
|
SUNXI_SRAM_MAP(0, 0, "cpu"),
|
|
SUNXI_SRAM_MAP(0x7fffffff, 1, "ve")),
|
|
};
|
|
|
|
static struct sunxi_sram_desc sun4i_a10_sram_d = {
|
|
.data = SUNXI_SRAM_DATA("D", 0x4, 0x0, 1,
|
|
SUNXI_SRAM_MAP(0, 0, "cpu"),
|
|
SUNXI_SRAM_MAP(1, 1, "usb-otg")),
|
|
};
|
|
|
|
static struct sunxi_sram_desc sun50i_a64_sram_c = {
|
|
.data = SUNXI_SRAM_DATA("C", 0x4, 24, 1,
|
|
SUNXI_SRAM_MAP(1, 0, "cpu"),
|
|
SUNXI_SRAM_MAP(0, 1, "de2")),
|
|
};
|
|
|
|
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-c1",
|
|
.data = &sun4i_a10_sram_c1.data,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun4i-a10-sram-d",
|
|
.data = &sun4i_a10_sram_d.data,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun50i-a64-sram-c",
|
|
.data = &sun50i_a64_sram_c.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 &= GENMASK(sram_data->width - 1, 0);
|
|
|
|
for (func = sram_data->func; func->func; func++) {
|
|
seq_printf(s, "\t\t%s%c\n", func->func,
|
|
func->reg_val == val ?
|
|
'*' : ' ');
|
|
}
|
|
}
|
|
|
|
seq_puts(s, "\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_SHOW_ATTRIBUTE(sunxi_sram);
|
|
|
|
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 *reg_value)
|
|
{
|
|
const struct of_device_id *match;
|
|
const struct sunxi_sram_data *data;
|
|
struct sunxi_sram_func *func;
|
|
struct of_phandle_args args;
|
|
u8 val;
|
|
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;
|
|
}
|
|
|
|
val = args.args[0];
|
|
|
|
match = of_match_node(sunxi_sram_dt_ids, args.np);
|
|
if (!match) {
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
data = match->data;
|
|
if (!data) {
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
for (func = data->func; func->func; func++) {
|
|
if (val == func->val) {
|
|
if (reg_value)
|
|
*reg_value = func->reg_val;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!func->func) {
|
|
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 PTR_ERR(base);
|
|
|
|
if (!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 - 1,
|
|
sram_data->offset);
|
|
val = readl(base + sram_data->reg);
|
|
val &= ~mask;
|
|
writel(val | ((device << sram_data->offset) & mask),
|
|
base + sram_data->reg);
|
|
|
|
sram_desc->claimed = true;
|
|
spin_unlock(&sram_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(sunxi_sram_claim);
|
|
|
|
void 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;
|
|
|
|
sram_data = sunxi_sram_of_parse(dev->of_node, NULL);
|
|
if (IS_ERR(sram_data))
|
|
return;
|
|
|
|
sram_desc = to_sram_desc(sram_data);
|
|
|
|
spin_lock(&sram_lock);
|
|
sram_desc->claimed = false;
|
|
spin_unlock(&sram_lock);
|
|
}
|
|
EXPORT_SYMBOL(sunxi_sram_release);
|
|
|
|
struct sunxi_sramc_variant {
|
|
int num_emac_clocks;
|
|
bool has_ldo_ctrl;
|
|
};
|
|
|
|
static const struct sunxi_sramc_variant sun4i_a10_sramc_variant = {
|
|
/* Nothing special */
|
|
};
|
|
|
|
static const struct sunxi_sramc_variant sun8i_h3_sramc_variant = {
|
|
.num_emac_clocks = 1,
|
|
};
|
|
|
|
static const struct sunxi_sramc_variant sun20i_d1_sramc_variant = {
|
|
.num_emac_clocks = 1,
|
|
.has_ldo_ctrl = true,
|
|
};
|
|
|
|
static const struct sunxi_sramc_variant sun50i_a64_sramc_variant = {
|
|
.num_emac_clocks = 1,
|
|
};
|
|
|
|
static const struct sunxi_sramc_variant sun50i_h616_sramc_variant = {
|
|
.num_emac_clocks = 2,
|
|
};
|
|
|
|
#define SUNXI_SRAM_EMAC_CLOCK_REG 0x30
|
|
#define SUNXI_SYS_LDO_CTRL_REG 0x150
|
|
|
|
static bool sunxi_sram_regmap_accessible_reg(struct device *dev,
|
|
unsigned int reg)
|
|
{
|
|
const struct sunxi_sramc_variant *variant = dev_get_drvdata(dev);
|
|
|
|
if (reg >= SUNXI_SRAM_EMAC_CLOCK_REG &&
|
|
reg < SUNXI_SRAM_EMAC_CLOCK_REG + variant->num_emac_clocks * 4)
|
|
return true;
|
|
if (reg == SUNXI_SYS_LDO_CTRL_REG && variant->has_ldo_ctrl)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static struct regmap_config sunxi_sram_regmap_config = {
|
|
.reg_bits = 32,
|
|
.val_bits = 32,
|
|
.reg_stride = 4,
|
|
/* last defined register */
|
|
.max_register = SUNXI_SYS_LDO_CTRL_REG,
|
|
/* other devices have no business accessing other registers */
|
|
.readable_reg = sunxi_sram_regmap_accessible_reg,
|
|
.writeable_reg = sunxi_sram_regmap_accessible_reg,
|
|
};
|
|
|
|
static int __init sunxi_sram_probe(struct platform_device *pdev)
|
|
{
|
|
const struct sunxi_sramc_variant *variant;
|
|
struct device *dev = &pdev->dev;
|
|
struct regmap *regmap;
|
|
|
|
sram_dev = &pdev->dev;
|
|
|
|
variant = of_device_get_match_data(&pdev->dev);
|
|
if (!variant)
|
|
return -EINVAL;
|
|
|
|
dev_set_drvdata(dev, (struct sunxi_sramc_variant *)variant);
|
|
|
|
base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
if (variant->num_emac_clocks || variant->has_ldo_ctrl) {
|
|
regmap = devm_regmap_init_mmio(dev, base, &sunxi_sram_regmap_config);
|
|
if (IS_ERR(regmap))
|
|
return PTR_ERR(regmap);
|
|
}
|
|
|
|
of_platform_populate(dev->of_node, NULL, NULL, dev);
|
|
|
|
debugfs_create_file("sram", 0444, NULL, NULL, &sunxi_sram_fops);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id sunxi_sram_dt_match[] = {
|
|
{
|
|
.compatible = "allwinner,sun4i-a10-sram-controller",
|
|
.data = &sun4i_a10_sramc_variant,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun4i-a10-system-control",
|
|
.data = &sun4i_a10_sramc_variant,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun5i-a13-system-control",
|
|
.data = &sun4i_a10_sramc_variant,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun8i-a23-system-control",
|
|
.data = &sun4i_a10_sramc_variant,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun8i-h3-system-control",
|
|
.data = &sun8i_h3_sramc_variant,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun20i-d1-system-control",
|
|
.data = &sun20i_d1_sramc_variant,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun50i-a64-sram-controller",
|
|
.data = &sun50i_a64_sramc_variant,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun50i-a64-system-control",
|
|
.data = &sun50i_a64_sramc_variant,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun50i-h5-system-control",
|
|
.data = &sun50i_a64_sramc_variant,
|
|
},
|
|
{
|
|
.compatible = "allwinner,sun50i-h616-system-control",
|
|
.data = &sun50i_h616_sramc_variant,
|
|
},
|
|
{ },
|
|
};
|
|
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,
|
|
},
|
|
};
|
|
builtin_platform_driver_probe(sunxi_sram_driver, sunxi_sram_probe);
|
|
|
|
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
|
|
MODULE_DESCRIPTION("Allwinner sunXi SRAM Controller Driver");
|
|
MODULE_LICENSE("GPL");
|