diff options
Diffstat (limited to 'drivers/soc/sunxi/sunxi_sram.c')
| -rw-r--r-- | drivers/soc/sunxi/sunxi_sram.c | 407 |
1 files changed, 407 insertions, 0 deletions
diff --git a/drivers/soc/sunxi/sunxi_sram.c b/drivers/soc/sunxi/sunxi_sram.c new file mode 100644 index 000000000..b4b0f3480 --- /dev/null +++ b/drivers/soc/sunxi/sunxi_sram.c @@ -0,0 +1,407 @@ +/* + * 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(0, 1, "cpu"), + SUNXI_SRAM_MAP(1, 0, "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; +} + +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 *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); + + 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); + +struct sunxi_sramc_variant { + bool has_emac_clock; +}; + +static const struct sunxi_sramc_variant sun4i_a10_sramc_variant = { + /* Nothing special */ +}; + +static const struct sunxi_sramc_variant sun50i_a64_sramc_variant = { + .has_emac_clock = true, +}; + +#define SUNXI_SRAM_EMAC_CLOCK_REG 0x30 +static bool sunxi_sram_regmap_accessible_reg(struct device *dev, + unsigned int reg) +{ + if (reg == SUNXI_SRAM_EMAC_CLOCK_REG) + return true; + return false; +} + +static struct regmap_config sunxi_sram_emac_clock_regmap = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + /* last defined register */ + .max_register = SUNXI_SRAM_EMAC_CLOCK_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 sunxi_sram_probe(struct platform_device *pdev) +{ + struct resource *res; + struct dentry *d; + struct regmap *emac_clock; + const struct sunxi_sramc_variant *variant; + + sram_dev = &pdev->dev; + + variant = of_device_get_match_data(&pdev->dev); + if (!variant) + return -EINVAL; + + 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; + + if (variant->has_emac_clock) { + emac_clock = devm_regmap_init_mmio(&pdev->dev, base, + &sunxi_sram_emac_clock_regmap); + + if (IS_ERR(emac_clock)) + return PTR_ERR(emac_clock); + } + + 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 = &sun4i_a10_sramc_variant, + }, + { + .compatible = "allwinner,sun50i-a64-sram-controller", + .data = &sun50i_a64_sramc_variant, + }, + { + .compatible = "allwinner,sun50i-a64-system-control", + .data = &sun50i_a64_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, + }, + .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"); |