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      1 // SPDX-License-Identifier: GPL-2.0+
      2 /*
      3  * Copyright (C) 2015-2016 Wills Wang <wills.wang (at) 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 ar933x_pinctrl_priv {
     22 	void __iomem *regs;
     23 };
     24 
     25 static 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 
     39 static 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 
     52 static 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 
     71 static int ar933x_pinctrl_get_periph_id(struct udevice *dev,
     72 					struct udevice *periph)
     73 {
     74 	u32 cell[2];
     75 	int ret;
     76 
     77 	ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(periph),
     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 
     91 static 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 
    102 static 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 
    108 static int ar933x_pinctrl_probe(struct udevice *dev)
    109 {
    110 	struct ar933x_pinctrl_priv *priv = dev_get_priv(dev);
    111 	fdt_addr_t addr;
    112 
    113 	addr = devfdt_get_addr(dev);
    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 
    123 static const struct udevice_id ar933x_pinctrl_ids[] = {
    124 	{ .compatible = "qca,ar933x-pinctrl" },
    125 	{ }
    126 };
    127 
    128 U_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 };
    136