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 
14 DECLARE_GLOBAL_DATA_PTR;
15 
16 enum periph_id {
17 	PERIPH_ID_UART0,
18 	PERIPH_ID_SPI0,
19 	PERIPH_ID_NONE = -1,
20 };
21 
22 struct ar933x_pinctrl_priv {
23 	void __iomem *regs;
24 };
25 
26 static 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 
40 static 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 
53 static 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 
72 static int ar933x_pinctrl_get_periph_id(struct udevice *dev,
73 					struct udevice *periph)
74 {
75 	u32 cell[2];
76 	int ret;
77 
78 	ret = fdtdec_get_int_array(gd->fdt_blob, periph->of_offset,
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 
92 static 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 
103 static 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 
109 static 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 
124 static const struct udevice_id ar933x_pinctrl_ids[] = {
125 	{ .compatible = "qca,ar933x-pinctrl" },
126 	{ }
127 };
128 
129 U_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 };
137