Wills Wang | a79d064 | 2016-03-16 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 | |
| 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 | |
Simon Glass | e160f7d | 2017-01-17 16:52:55 -0700 | [diff] [blame] | 78 | ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(periph), |
Wills Wang | a79d064 | 2016-03-16 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 | |
| 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 | }; |