2 * Copyright (C) 2016 Peng Fan <van.freenix@gmail.com>
4 * SPDX-License-Identifier: GPL-2.0+
10 #include <linux/err.h>
11 #include <dm/device.h>
12 #include <dm/pinctrl.h>
14 #include "pinctrl-imx.h"
16 DECLARE_GLOBAL_DATA_PTR;
18 static int imx_pinctrl_set_state(struct udevice *dev, struct udevice *config)
20 struct imx_pinctrl_priv *priv = dev_get_priv(dev);
21 struct imx_pinctrl_soc_info *info = priv->info;
22 int node = dev_of_offset(config);
23 const struct fdt_property *prop;
25 int npins, size, pin_size;
26 int mux_reg, conf_reg, input_reg, input_val, mux_mode, config_val;
27 u32 mux_shift = info->mux_mask ? ffs(info->mux_mask) - 1 : 0;
30 dev_dbg(dev, "%s: %s\n", __func__, config->name);
32 if (info->flags & SHARE_MUX_CONF_REG)
33 pin_size = SHARE_FSL_PIN_SIZE;
35 pin_size = FSL_PIN_SIZE;
37 prop = fdt_getprop(gd->fdt_blob, node, "fsl,pins", &size);
39 dev_err(dev, "No fsl,pins property in node %s\n", config->name);
43 if (!size || size % pin_size) {
44 dev_err(dev, "Invalid fsl,pins property in node %s\n",
49 pin_data = devm_kzalloc(dev, size, 0);
53 if (fdtdec_get_int_array(gd->fdt_blob, node, "fsl,pins",
54 pin_data, size >> 2)) {
55 dev_err(dev, "Error reading pin data.\n");
59 npins = size / pin_size;
62 * Refer to linux documentation for details:
63 * Documentation/devicetree/bindings/pinctrl/fsl,imx-pinctrl.txt
65 for (i = 0; i < npins; i++) {
66 mux_reg = pin_data[j++];
68 if (!(info->flags & ZERO_OFFSET_VALID) && !mux_reg)
71 if (info->flags & SHARE_MUX_CONF_REG) {
74 conf_reg = pin_data[j++];
75 if (!(info->flags & ZERO_OFFSET_VALID) && !conf_reg)
79 if ((mux_reg == -1) || (conf_reg == -1)) {
80 dev_err(dev, "Error mux_reg or conf_reg\n");
84 input_reg = pin_data[j++];
85 mux_mode = pin_data[j++];
86 input_val = pin_data[j++];
87 config_val = pin_data[j++];
89 dev_dbg(dev, "mux_reg 0x%x, conf_reg 0x%x, input_reg 0x%x, "
90 "mux_mode 0x%x, input_val 0x%x, config_val 0x%x\n",
91 mux_reg, conf_reg, input_reg, mux_mode, input_val,
94 if (config_val & IMX_PAD_SION)
95 mux_mode |= IOMUXC_CONFIG_SION;
97 config_val &= ~IMX_PAD_SION;
100 if (info->flags & SHARE_MUX_CONF_REG) {
101 clrsetbits_le32(info->base + mux_reg, info->mux_mask,
102 mux_mode << mux_shift);
104 writel(mux_mode, info->base + mux_reg);
107 dev_dbg(dev, "write mux: offset 0x%x val 0x%x\n", mux_reg,
113 * If the select input value begins with 0xff, it's a quirky
114 * select input and the value should be interpreted as below.
116 * | 0xff | shift | width | select |
117 * It's used to work around the problem that the select
118 * input for some pin is not implemented in the select
119 * input register but in some general purpose register.
120 * We encode the select input value, width and shift of
121 * the bit field into input_val cell of pin function ID
122 * in device tree, and then decode them here for setting
123 * up the select input bits in general purpose register.
126 if (input_val >> 24 == 0xff) {
128 u8 select = val & 0xff;
129 u8 width = (val >> 8) & 0xff;
130 u8 shift = (val >> 16) & 0xff;
131 u32 mask = ((1 << width) - 1) << shift;
133 * The input_reg[i] here is actually some IOMUXC general
134 * purpose register, not regular select input register.
136 val = readl(info->base + input_reg);
138 val |= select << shift;
139 writel(val, info->base + input_reg);
140 } else if (input_reg) {
142 * Regular select input register can never be at offset
143 * 0, and we only print register value for regular case.
145 if (info->input_sel_base)
146 writel(input_val, info->input_sel_base +
149 writel(input_val, info->base + input_reg);
151 dev_dbg(dev, "select_input: offset 0x%x val 0x%x\n",
152 input_reg, input_val);
156 if (!(config_val & IMX_NO_PAD_CTL)) {
157 if (info->flags & SHARE_MUX_CONF_REG) {
158 clrsetbits_le32(info->base + conf_reg,
159 info->mux_mask, config_val);
161 writel(config_val, info->base + conf_reg);
164 dev_dbg(dev, "write config: offset 0x%x val 0x%x\n",
165 conf_reg, config_val);
172 const struct pinctrl_ops imx_pinctrl_ops = {
173 .set_state = imx_pinctrl_set_state,
176 int imx_pinctrl_probe(struct udevice *dev,
177 struct imx_pinctrl_soc_info *info)
179 struct imx_pinctrl_priv *priv = dev_get_priv(dev);
180 int node = dev_of_offset(dev), ret;
181 struct fdtdec_phandle_args arg;
186 dev_err(dev, "wrong pinctrl info\n");
193 addr = fdtdec_get_addr_size(gd->fdt_blob, dev_of_offset(dev), "reg",
196 if (addr == FDT_ADDR_T_NONE)
199 info->base = map_sysmem(addr, size);
204 info->mux_mask = fdtdec_get_int(gd->fdt_blob, node, "fsl,mux_mask", 0);
206 * Refer to linux documentation for details:
207 * Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt
209 if (fdtdec_get_bool(gd->fdt_blob, node, "fsl,input-sel")) {
210 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob,
211 node, "fsl,input-sel",
214 dev_err(dev, "iomuxc fsl,input-sel property not found\n");
218 addr = fdtdec_get_addr_size(gd->fdt_blob, arg.node, "reg",
220 if (addr == FDT_ADDR_T_NONE)
223 info->input_sel_base = map_sysmem(addr, size);
224 if (!info->input_sel_base)
228 dev_dbg(dev, "initialized IMX pinctrl driver\n");
233 int imx_pinctrl_remove(struct udevice *dev)
235 struct imx_pinctrl_priv *priv = dev_get_priv(dev);
236 struct imx_pinctrl_soc_info *info = priv->info;
238 if (info->input_sel_base)
239 unmap_sysmem(info->input_sel_base);
241 unmap_sysmem(info->base);