1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2019 Marek Vasut <marek.vasut@gmail.com>
10 #include <asm/global_data.h>
13 #include <linux/bitops.h>
15 #define P(bank) (0x0000 + (bank) * 4)
16 #define PSR(bank) (0x0100 + (bank) * 4)
17 #define PPR(bank) (0x0200 + (bank) * 4)
18 #define PM(bank) (0x0300 + (bank) * 4)
19 #define PMC(bank) (0x0400 + (bank) * 4)
20 #define PFC(bank) (0x0500 + (bank) * 4)
21 #define PFCE(bank) (0x0600 + (bank) * 4)
22 #define PNOT(bank) (0x0700 + (bank) * 4)
23 #define PMSR(bank) (0x0800 + (bank) * 4)
24 #define PMCSR(bank) (0x0900 + (bank) * 4)
25 #define PFCAE(bank) (0x0A00 + (bank) * 4)
26 #define PIBC(bank) (0x4000 + (bank) * 4)
27 #define PBDC(bank) (0x4100 + (bank) * 4)
28 #define PIPC(bank) (0x4200 + (bank) * 4)
30 #define RZA1_MAX_GPIO_PER_BANK 16
32 DECLARE_GLOBAL_DATA_PTR;
34 struct r7s72100_gpio_priv {
39 static int r7s72100_gpio_get_value(struct udevice *dev, unsigned offset)
41 struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
43 return !!(readw(priv->regs + PPR(priv->bank)) & BIT(offset));
46 static int r7s72100_gpio_set_value(struct udevice *dev, unsigned line,
49 struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
51 writel(BIT(line + 16) | (value ? BIT(line) : 0),
52 priv->regs + PSR(priv->bank));
57 static void r7s72100_gpio_set_direction(struct udevice *dev, unsigned line,
60 struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
62 writel(BIT(line + 16), priv->regs + PMCSR(priv->bank));
63 writel(BIT(line + 16) | (output ? 0 : BIT(line)),
64 priv->regs + PMSR(priv->bank));
66 clrsetbits_le16(priv->regs + PIBC(priv->bank), BIT(line),
67 output ? 0 : BIT(line));
70 static int r7s72100_gpio_direction_input(struct udevice *dev, unsigned offset)
72 r7s72100_gpio_set_direction(dev, offset, false);
76 static int r7s72100_gpio_direction_output(struct udevice *dev, unsigned offset,
79 /* write GPIO value to output before selecting output mode of pin */
80 r7s72100_gpio_set_value(dev, offset, value);
81 r7s72100_gpio_set_direction(dev, offset, true);
86 static int r7s72100_gpio_get_function(struct udevice *dev, unsigned offset)
88 struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
90 if (readw(priv->regs + PM(priv->bank)) & BIT(offset))
96 static const struct dm_gpio_ops r7s72100_gpio_ops = {
97 .direction_input = r7s72100_gpio_direction_input,
98 .direction_output = r7s72100_gpio_direction_output,
99 .get_value = r7s72100_gpio_get_value,
100 .set_value = r7s72100_gpio_set_value,
101 .get_function = r7s72100_gpio_get_function,
104 static int r7s72100_gpio_probe(struct udevice *dev)
106 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
107 struct r7s72100_gpio_priv *priv = dev_get_priv(dev);
108 struct fdtdec_phandle_args args;
109 int node = dev_of_offset(dev);
112 fdt_addr_t addr_base;
114 uc_priv->bank_name = dev->name;
115 dev = dev_get_parent(dev);
116 addr_base = dev_read_addr(dev);
117 if (addr_base == FDT_ADDR_T_NONE)
120 priv->regs = (void __iomem *)addr_base;
122 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges",
124 priv->bank = ret == 0 ? (args.args[1] / RZA1_MAX_GPIO_PER_BANK) : -1;
125 uc_priv->gpio_count = ret == 0 ? args.args[2] : RZA1_MAX_GPIO_PER_BANK;
130 U_BOOT_DRIVER(r7s72100_gpio) = {
131 .name = "r7s72100-gpio",
133 .ops = &r7s72100_gpio_ops,
134 .priv_auto = sizeof(struct r7s72100_gpio_priv),
135 .probe = r7s72100_gpio_probe,