pinctrl: add nexell driver
[platform/kernel/u-boot.git] / drivers / pinctrl / nexell / pinctrl-nexell.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Pinctrl driver for Nexell SoCs
4  * (C) Copyright 2016 Nexell
5  * Bongyu, KOO <freestyle@nexell.co.kr>
6  */
7
8 #include <common.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <asm/io.h>
12 #include "pinctrl-nexell.h"
13 #include "pinctrl-s5pxx18.h"
14
15 DECLARE_GLOBAL_DATA_PTR;
16
17 /* given a pin-name, return the address of pin config registers */
18 unsigned long pin_to_bank_base(struct udevice *dev, const char *pin_name,
19                                u32 *pin)
20 {
21         struct nexell_pinctrl_priv *priv = dev_get_priv(dev);
22         const struct nexell_pin_ctrl *pin_ctrl = priv->pin_ctrl;
23         const struct nexell_pin_bank_data *bank_data = pin_ctrl->pin_banks;
24         u32 nr_banks = pin_ctrl->nr_banks, idx = 0;
25         char bank[10];
26
27         /*
28          * The format of the pin name is <bank name>-<pin_number>.
29          * Example: gpioa-4 (gpioa is the bank name and 4 is the pin number)
30          */
31         while (pin_name[idx] != '-') {
32                 bank[idx] = pin_name[idx];
33                 idx++;
34         }
35         bank[idx] = '\0';
36         *pin = (u32)simple_strtoul(&pin_name[++idx], NULL, 10);
37
38         /* lookup the pin bank data using the pin bank name */
39         for (idx = 0; idx < nr_banks; idx++)
40                 if (!strcmp(bank, bank_data[idx].name))
41                         break;
42
43         return priv->base + bank_data[idx].offset;
44 }
45
46 int nexell_pinctrl_probe(struct udevice *dev)
47 {
48         struct nexell_pinctrl_priv *priv;
49         fdt_addr_t base;
50
51         priv = dev_get_priv(dev);
52         if (!priv)
53                 return -EINVAL;
54
55         base = devfdt_get_addr(dev);
56         if (base == FDT_ADDR_T_NONE)
57                 return -EINVAL;
58
59         priv->base = base;
60
61         priv->pin_ctrl = (struct nexell_pin_ctrl *)dev_get_driver_data(dev);
62
63         s5pxx18_pinctrl_init(dev);
64
65         return 0;
66 }