1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
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 
13 DECLARE_GLOBAL_DATA_PTR;
14 
15 enum periph_id {
16 	PERIPH_ID_UART0,
17 	PERIPH_ID_SPI0,
18 	PERIPH_ID_NONE = -1,
19 };
20 
21 struct qca953x_pinctrl_priv {
22 	void __iomem *regs;
23 };
24 
25 static void pinctrl_qca953x_spi_config(struct qca953x_pinctrl_priv *priv, int cs)
26 {
27 	switch (cs) {
28 	case 0:
29 		clrsetbits_be32(priv->regs + AR71XX_GPIO_REG_OE,
30 				QCA953X_GPIO(5) | QCA953X_GPIO(6) |
31 				QCA953X_GPIO(7), QCA953X_GPIO(8));
32 
33 		clrsetbits_be32(priv->regs + QCA953X_GPIO_REG_OUT_FUNC1,
34 				QCA953X_GPIO_MUX_MASK(8) |
35 				QCA953X_GPIO_MUX_MASK(16) |
36 				QCA953X_GPIO_MUX_MASK(24),
37 				(QCA953X_GPIO_OUT_MUX_SPI_CS0 << 8) |
38 				(QCA953X_GPIO_OUT_MUX_SPI_CLK << 16) |
39 				(QCA953X_GPIO_OUT_MUX_SPI_MOSI << 24));
40 
41 		clrsetbits_be32(priv->regs + QCA953X_GPIO_REG_IN_ENABLE0,
42 				QCA953X_GPIO_MUX_MASK(0),
43 				QCA953X_GPIO_IN_MUX_SPI_DATA_IN);
44 
45 		setbits_be32(priv->regs + AR71XX_GPIO_REG_OUT,
46 			     QCA953X_GPIO(8));
47 		break;
48 	}
49 }
50 
51 static void pinctrl_qca953x_uart_config(struct qca953x_pinctrl_priv *priv, int uart_id)
52 {
53 	switch (uart_id) {
54 	case PERIPH_ID_UART0:
55 		clrsetbits_be32(priv->regs + AR71XX_GPIO_REG_OE,
56 				QCA953X_GPIO(9), QCA953X_GPIO(10));
57 
58 		clrsetbits_be32(priv->regs + QCA953X_GPIO_REG_OUT_FUNC2,
59 				QCA953X_GPIO_MUX_MASK(16),
60 				QCA953X_GPIO_OUT_MUX_UART0_SOUT << 16);
61 
62 		clrsetbits_be32(priv->regs + QCA953X_GPIO_REG_IN_ENABLE0,
63 				QCA953X_GPIO_MUX_MASK(8),
64 				QCA953X_GPIO_IN_MUX_UART0_SIN << 8);
65 
66 		setbits_be32(priv->regs + AR71XX_GPIO_REG_OUT,
67 			     QCA953X_GPIO(10));
68 		break;
69 	}
70 }
71 
72 static int qca953x_pinctrl_request(struct udevice *dev, int func, int flags)
73 {
74 	struct qca953x_pinctrl_priv *priv = dev_get_priv(dev);
75 
76 	debug("%s: func=%x, flags=%x\n", __func__, func, flags);
77 	switch (func) {
78 	case PERIPH_ID_SPI0:
79 		pinctrl_qca953x_spi_config(priv, flags);
80 		break;
81 	case PERIPH_ID_UART0:
82 		pinctrl_qca953x_uart_config(priv, func);
83 		break;
84 	default:
85 		return -EINVAL;
86 	}
87 
88 	return 0;
89 }
90 
91 static int qca953x_pinctrl_get_periph_id(struct udevice *dev,
92 					struct udevice *periph)
93 {
94 	u32 cell[2];
95 	int ret;
96 
97 	ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(periph),
98 				   "interrupts", cell, ARRAY_SIZE(cell));
99 	if (ret < 0)
100 		return -EINVAL;
101 
102 	switch (cell[0]) {
103 	case 128:
104 		return PERIPH_ID_UART0;
105 	case 129:
106 		return PERIPH_ID_SPI0;
107 	}
108 	return -ENOENT;
109 }
110 
111 static int qca953x_pinctrl_set_state_simple(struct udevice *dev,
112 					   struct udevice *periph)
113 {
114 	int func;
115 
116 	func = qca953x_pinctrl_get_periph_id(dev, periph);
117 	if (func < 0)
118 		return func;
119 	return qca953x_pinctrl_request(dev, func, 0);
120 }
121 
122 static struct pinctrl_ops qca953x_pinctrl_ops = {
123 	.set_state_simple	= qca953x_pinctrl_set_state_simple,
124 	.request	= qca953x_pinctrl_request,
125 	.get_periph_id	= qca953x_pinctrl_get_periph_id,
126 };
127 
128 static int qca953x_pinctrl_probe(struct udevice *dev)
129 {
130 	struct qca953x_pinctrl_priv *priv = dev_get_priv(dev);
131 	fdt_addr_t addr;
132 
133 	addr = devfdt_get_addr(dev);
134 	if (addr == FDT_ADDR_T_NONE)
135 		return -EINVAL;
136 
137 	priv->regs = map_physmem(addr,
138 				 AR71XX_GPIO_SIZE,
139 				 MAP_NOCACHE);
140 	return 0;
141 }
142 
143 static const struct udevice_id qca953x_pinctrl_ids[] = {
144 	{ .compatible = "qca,qca953x-pinctrl" },
145 	{ }
146 };
147 
148 U_BOOT_DRIVER(pinctrl_qca953x) = {
149 	.name		= "pinctrl_qca953x",
150 	.id		= UCLASS_PINCTRL,
151 	.of_match	= qca953x_pinctrl_ids,
152 	.priv_auto_alloc_size = sizeof(struct qca953x_pinctrl_priv),
153 	.ops		= &qca953x_pinctrl_ops,
154 	.probe		= qca953x_pinctrl_probe,
155 };
156