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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / edee114a8b7ffcbc1bd42ab269a6e69a864ff6a7 / . / drivers / pinctrl / ath79 / pinctrl_ar933x.c
blob: fccc7c4b0668cfc8b15a6440fc0363989a9cf6fb [file] [log] [blame]
Wills Wanga79d0642016-03-16 16:59:55 +0800[diff] [blame]1/*
2 * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <dm.h>
9#include <errno.h>
10#include <asm/io.h>
11#include <dm/pinctrl.h>
12#include <mach/ar71xx_regs.h>
13
14DECLARE_GLOBAL_DATA_PTR;
15
16enum periph_id {
17 PERIPH_ID_UART0,
18 PERIPH_ID_SPI0,
19 PERIPH_ID_NONE = -1,
20};
21
22struct ar933x_pinctrl_priv {
23 void __iomem *regs;
24};
25
26static void pinctrl_ar933x_spi_config(struct ar933x_pinctrl_priv *priv, int cs)
27{
28 switch (cs) {
29 case 0:
30 clrsetbits_be32(priv->regs + AR71XX_GPIO_REG_OE,
31 AR933X_GPIO(4), AR933X_GPIO(3) |
32 AR933X_GPIO(5) | AR933X_GPIO(2));
33 setbits_be32(priv->regs + AR71XX_GPIO_REG_FUNC,
34 AR933X_GPIO_FUNC_SPI_EN |
35 AR933X_GPIO_FUNC_RES_TRUE);
36 break;
37 }
38}
39
40static void pinctrl_ar933x_uart_config(struct ar933x_pinctrl_priv *priv, int uart_id)
41{
42 switch (uart_id) {
43 case PERIPH_ID_UART0:
44 clrsetbits_be32(priv->regs + AR71XX_GPIO_REG_OE,
45 AR933X_GPIO(9), AR933X_GPIO(10));
46 setbits_be32(priv->regs + AR71XX_GPIO_REG_FUNC,
47 AR933X_GPIO_FUNC_UART_EN |
48 AR933X_GPIO_FUNC_RES_TRUE);
49 break;
50 }
51}
52
53static int ar933x_pinctrl_request(struct udevice *dev, int func, int flags)
54{
55 struct ar933x_pinctrl_priv *priv = dev_get_priv(dev);
56
57 debug("%s: func=%x, flags=%x\n", __func__, func, flags);
58 switch (func) {
59 case PERIPH_ID_SPI0:
60 pinctrl_ar933x_spi_config(priv, flags);
61 break;
62 case PERIPH_ID_UART0:
63 pinctrl_ar933x_uart_config(priv, func);
64 break;
65 default:
66 return -EINVAL;
67 }
68
69 return 0;
70}
71
72static int ar933x_pinctrl_get_periph_id(struct udevice *dev,
73 struct udevice *periph)
74{
75 u32 cell[2];
76 int ret;
77
Simon Glasse160f7d2017-01-17 16:52:55 -0700[diff] [blame]78 ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(periph),
Wills Wanga79d0642016-03-16 16:59:55 +0800[diff] [blame]79 "interrupts", cell, ARRAY_SIZE(cell));
80 if (ret < 0)
81 return -EINVAL;
82
83 switch (cell[0]) {
84 case 128:
85 return PERIPH_ID_UART0;
86 case 129:
87 return PERIPH_ID_SPI0;
88 }
89 return -ENOENT;
90}
91
92static int ar933x_pinctrl_set_state_simple(struct udevice *dev,
93 struct udevice *periph)
94{
95 int func;
96
97 func = ar933x_pinctrl_get_periph_id(dev, periph);
98 if (func < 0)
99 return func;
100 return ar933x_pinctrl_request(dev, func, 0);
101}
102
103static struct pinctrl_ops ar933x_pinctrl_ops = {
104 .set_state_simple = ar933x_pinctrl_set_state_simple,
105 .request = ar933x_pinctrl_request,
106 .get_periph_id = ar933x_pinctrl_get_periph_id,
107};
108
109static int ar933x_pinctrl_probe(struct udevice *dev)
110{
111 struct ar933x_pinctrl_priv *priv = dev_get_priv(dev);
112 fdt_addr_t addr;
113
114 addr = dev_get_addr(dev);
115 if (addr == FDT_ADDR_T_NONE)
116 return -EINVAL;
117
118 priv->regs = map_physmem(addr,
119 AR71XX_GPIO_SIZE,
120 MAP_NOCACHE);
121 return 0;
122}
123
124static const struct udevice_id ar933x_pinctrl_ids[] = {
125 { .compatible = "qca,ar933x-pinctrl" },
126 { }
127};
128
129U_BOOT_DRIVER(pinctrl_ar933x) = {
130 .name = "pinctrl_ar933x",
131 .id = UCLASS_PINCTRL,
132 .of_match = ar933x_pinctrl_ids,
133 .priv_auto_alloc_size = sizeof(struct ar933x_pinctrl_priv),
134 .ops = &ar933x_pinctrl_ops,
135 .probe = ar933x_pinctrl_probe,
136};