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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 26ee8fc369f1f5a697d37d6a732498b252a6b561 / . / drivers / pinctrl / ath79 / pinctrl_ar933x.c
blob: 5e154a9f19ba49bfc00676b8a9de5bacf5967f7a [file] [log] [blame]
Tom Rini83d290c2018-05-06 17:58:06 -0400[diff] [blame]1// SPDX-License-Identifier: GPL-2.0+
Wills Wanga79d0642016-03-16 16:59:55 +0800[diff] [blame]2/*
3 * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
Wills Wanga79d0642016-03-16 16:59:55 +0800[diff] [blame]4 */
5
6#include <common.h>
7#include <dm.h>
8#include <errno.h>
9#include <asm/io.h>
10#include <dm/pinctrl.h>
11#include <mach/ar71xx_regs.h>
12
13DECLARE_GLOBAL_DATA_PTR;
14
15enum periph_id {
16 PERIPH_ID_UART0,
17 PERIPH_ID_SPI0,
18 PERIPH_ID_NONE = -1,
19};
20
21struct ar933x_pinctrl_priv {
22 void __iomem *regs;
23};
24
25static void pinctrl_ar933x_spi_config(struct ar933x_pinctrl_priv *priv, int cs)
26{
27 switch (cs) {
28 case 0:
29 clrsetbits_be32(priv->regs + AR71XX_GPIO_REG_OE,
30 AR933X_GPIO(4), AR933X_GPIO(3) |
31 AR933X_GPIO(5) | AR933X_GPIO(2));
32 setbits_be32(priv->regs + AR71XX_GPIO_REG_FUNC,
33 AR933X_GPIO_FUNC_SPI_EN |
34 AR933X_GPIO_FUNC_RES_TRUE);
35 break;
36 }
37}
38
39static void pinctrl_ar933x_uart_config(struct ar933x_pinctrl_priv *priv, int uart_id)
40{
41 switch (uart_id) {
42 case PERIPH_ID_UART0:
43 clrsetbits_be32(priv->regs + AR71XX_GPIO_REG_OE,
44 AR933X_GPIO(9), AR933X_GPIO(10));
45 setbits_be32(priv->regs + AR71XX_GPIO_REG_FUNC,
46 AR933X_GPIO_FUNC_UART_EN |
47 AR933X_GPIO_FUNC_RES_TRUE);
48 break;
49 }
50}
51
52static int ar933x_pinctrl_request(struct udevice *dev, int func, int flags)
53{
54 struct ar933x_pinctrl_priv *priv = dev_get_priv(dev);
55
56 debug("%s: func=%x, flags=%x\n", __func__, func, flags);
57 switch (func) {
58 case PERIPH_ID_SPI0:
59 pinctrl_ar933x_spi_config(priv, flags);
60 break;
61 case PERIPH_ID_UART0:
62 pinctrl_ar933x_uart_config(priv, func);
63 break;
64 default:
65 return -EINVAL;
66 }
67
68 return 0;
69}
70
71static int ar933x_pinctrl_get_periph_id(struct udevice *dev,
72 struct udevice *periph)
73{
74 u32 cell[2];
75 int ret;
76
Simon Glasse160f7d2017-01-17 16:52:55 -0700[diff] [blame]77 ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(periph),
Wills Wanga79d0642016-03-16 16:59:55 +0800[diff] [blame]78 "interrupts", cell, ARRAY_SIZE(cell));
79 if (ret < 0)
80 return -EINVAL;
81
82 switch (cell[0]) {
83 case 128:
84 return PERIPH_ID_UART0;
85 case 129:
86 return PERIPH_ID_SPI0;
87 }
88 return -ENOENT;
89}
90
91static int ar933x_pinctrl_set_state_simple(struct udevice *dev,
92 struct udevice *periph)
93{
94 int func;
95
96 func = ar933x_pinctrl_get_periph_id(dev, periph);
97 if (func < 0)
98 return func;
99 return ar933x_pinctrl_request(dev, func, 0);
100}
101
102static struct pinctrl_ops ar933x_pinctrl_ops = {
103 .set_state_simple = ar933x_pinctrl_set_state_simple,
104 .request = ar933x_pinctrl_request,
105 .get_periph_id = ar933x_pinctrl_get_periph_id,
106};
107
108static int ar933x_pinctrl_probe(struct udevice *dev)
109{
110 struct ar933x_pinctrl_priv *priv = dev_get_priv(dev);
111 fdt_addr_t addr;
112
Simon Glassa821c4a2017-05-17 17:18:05 -0600[diff] [blame]113 addr = devfdt_get_addr(dev);
Wills Wanga79d0642016-03-16 16:59:55 +0800[diff] [blame]114 if (addr == FDT_ADDR_T_NONE)
115 return -EINVAL;
116
117 priv->regs = map_physmem(addr,
118 AR71XX_GPIO_SIZE,
119 MAP_NOCACHE);
120 return 0;
121}
122
123static const struct udevice_id ar933x_pinctrl_ids[] = {
124 { .compatible = "qca,ar933x-pinctrl" },
125 { }
126};
127
128U_BOOT_DRIVER(pinctrl_ar933x) = {
129 .name = "pinctrl_ar933x",
130 .id = UCLASS_PINCTRL,
131 .of_match = ar933x_pinctrl_ids,
132 .priv_auto_alloc_size = sizeof(struct ar933x_pinctrl_priv),
133 .ops = &ar933x_pinctrl_ops,
134 .probe = ar933x_pinctrl_probe,
135};