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745df68d PF |
1 | /* |
2 | * Copyright (C) 2016 Peng Fan <van.freenix@gmail.com> | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0+ | |
5 | */ | |
6 | ||
7 | #include <common.h> | |
8 | #include <mapmem.h> | |
9 | #include <linux/io.h> | |
10 | #include <linux/err.h> | |
9d922450 | 11 | #include <dm.h> |
745df68d PF |
12 | #include <dm/pinctrl.h> |
13 | ||
14 | #include "pinctrl-imx.h" | |
15 | ||
16 | DECLARE_GLOBAL_DATA_PTR; | |
17 | ||
18 | static int imx_pinctrl_set_state(struct udevice *dev, struct udevice *config) | |
19 | { | |
20 | struct imx_pinctrl_priv *priv = dev_get_priv(dev); | |
21 | struct imx_pinctrl_soc_info *info = priv->info; | |
e160f7d4 | 22 | int node = dev_of_offset(config); |
745df68d PF |
23 | const struct fdt_property *prop; |
24 | u32 *pin_data; | |
25 | int npins, size, pin_size; | |
26 | int mux_reg, conf_reg, input_reg, input_val, mux_mode, config_val; | |
4aa9d4d0 | 27 | u32 mux_shift = info->mux_mask ? ffs(info->mux_mask) - 1 : 0; |
745df68d PF |
28 | int i, j = 0; |
29 | ||
30 | dev_dbg(dev, "%s: %s\n", __func__, config->name); | |
31 | ||
32 | if (info->flags & SHARE_MUX_CONF_REG) | |
33 | pin_size = SHARE_FSL_PIN_SIZE; | |
34 | else | |
35 | pin_size = FSL_PIN_SIZE; | |
36 | ||
37 | prop = fdt_getprop(gd->fdt_blob, node, "fsl,pins", &size); | |
38 | if (!prop) { | |
39 | dev_err(dev, "No fsl,pins property in node %s\n", config->name); | |
40 | return -EINVAL; | |
41 | } | |
42 | ||
43 | if (!size || size % pin_size) { | |
44 | dev_err(dev, "Invalid fsl,pins property in node %s\n", | |
45 | config->name); | |
46 | return -EINVAL; | |
47 | } | |
48 | ||
49 | pin_data = devm_kzalloc(dev, size, 0); | |
50 | if (!pin_data) | |
51 | return -ENOMEM; | |
52 | ||
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"); | |
c1d1e9d6 | 56 | devm_kfree(dev, pin_data); |
745df68d PF |
57 | return -EINVAL; |
58 | } | |
59 | ||
60 | npins = size / pin_size; | |
61 | ||
62 | /* | |
63 | * Refer to linux documentation for details: | |
64 | * Documentation/devicetree/bindings/pinctrl/fsl,imx-pinctrl.txt | |
65 | */ | |
66 | for (i = 0; i < npins; i++) { | |
67 | mux_reg = pin_data[j++]; | |
68 | ||
69 | if (!(info->flags & ZERO_OFFSET_VALID) && !mux_reg) | |
70 | mux_reg = -1; | |
71 | ||
72 | if (info->flags & SHARE_MUX_CONF_REG) { | |
73 | conf_reg = mux_reg; | |
74 | } else { | |
75 | conf_reg = pin_data[j++]; | |
76 | if (!(info->flags & ZERO_OFFSET_VALID) && !conf_reg) | |
77 | conf_reg = -1; | |
78 | } | |
79 | ||
80 | if ((mux_reg == -1) || (conf_reg == -1)) { | |
81 | dev_err(dev, "Error mux_reg or conf_reg\n"); | |
c1d1e9d6 | 82 | devm_kfree(dev, pin_data); |
745df68d PF |
83 | return -EINVAL; |
84 | } | |
85 | ||
86 | input_reg = pin_data[j++]; | |
87 | mux_mode = pin_data[j++]; | |
88 | input_val = pin_data[j++]; | |
89 | config_val = pin_data[j++]; | |
90 | ||
91 | dev_dbg(dev, "mux_reg 0x%x, conf_reg 0x%x, input_reg 0x%x, " | |
92 | "mux_mode 0x%x, input_val 0x%x, config_val 0x%x\n", | |
93 | mux_reg, conf_reg, input_reg, mux_mode, input_val, | |
94 | config_val); | |
95 | ||
96 | if (config_val & IMX_PAD_SION) | |
97 | mux_mode |= IOMUXC_CONFIG_SION; | |
98 | ||
99 | config_val &= ~IMX_PAD_SION; | |
100 | ||
101 | /* Set Mux */ | |
102 | if (info->flags & SHARE_MUX_CONF_REG) { | |
4aa9d4d0 PF |
103 | clrsetbits_le32(info->base + mux_reg, info->mux_mask, |
104 | mux_mode << mux_shift); | |
745df68d PF |
105 | } else { |
106 | writel(mux_mode, info->base + mux_reg); | |
107 | } | |
108 | ||
109 | dev_dbg(dev, "write mux: offset 0x%x val 0x%x\n", mux_reg, | |
110 | mux_mode); | |
111 | ||
112 | /* | |
113 | * Set select input | |
114 | * | |
115 | * If the select input value begins with 0xff, it's a quirky | |
116 | * select input and the value should be interpreted as below. | |
117 | * 31 23 15 7 0 | |
118 | * | 0xff | shift | width | select | | |
119 | * It's used to work around the problem that the select | |
120 | * input for some pin is not implemented in the select | |
121 | * input register but in some general purpose register. | |
122 | * We encode the select input value, width and shift of | |
123 | * the bit field into input_val cell of pin function ID | |
124 | * in device tree, and then decode them here for setting | |
125 | * up the select input bits in general purpose register. | |
126 | */ | |
127 | ||
128 | if (input_val >> 24 == 0xff) { | |
129 | u32 val = input_val; | |
130 | u8 select = val & 0xff; | |
131 | u8 width = (val >> 8) & 0xff; | |
132 | u8 shift = (val >> 16) & 0xff; | |
133 | u32 mask = ((1 << width) - 1) << shift; | |
134 | /* | |
135 | * The input_reg[i] here is actually some IOMUXC general | |
136 | * purpose register, not regular select input register. | |
137 | */ | |
138 | val = readl(info->base + input_reg); | |
139 | val &= ~mask; | |
140 | val |= select << shift; | |
141 | writel(val, info->base + input_reg); | |
142 | } else if (input_reg) { | |
143 | /* | |
144 | * Regular select input register can never be at offset | |
145 | * 0, and we only print register value for regular case. | |
146 | */ | |
147 | if (info->input_sel_base) | |
148 | writel(input_val, info->input_sel_base + | |
149 | input_reg); | |
150 | else | |
151 | writel(input_val, info->base + input_reg); | |
152 | ||
153 | dev_dbg(dev, "select_input: offset 0x%x val 0x%x\n", | |
154 | input_reg, input_val); | |
155 | } | |
156 | ||
157 | /* Set config */ | |
158 | if (!(config_val & IMX_NO_PAD_CTL)) { | |
159 | if (info->flags & SHARE_MUX_CONF_REG) { | |
4aa9d4d0 | 160 | clrsetbits_le32(info->base + conf_reg, |
63fbc59b | 161 | ~info->mux_mask, config_val); |
745df68d PF |
162 | } else { |
163 | writel(config_val, info->base + conf_reg); | |
164 | } | |
165 | ||
166 | dev_dbg(dev, "write config: offset 0x%x val 0x%x\n", | |
167 | conf_reg, config_val); | |
168 | } | |
169 | } | |
170 | ||
c1d1e9d6 PF |
171 | devm_kfree(dev, pin_data); |
172 | ||
745df68d PF |
173 | return 0; |
174 | } | |
175 | ||
176 | const struct pinctrl_ops imx_pinctrl_ops = { | |
177 | .set_state = imx_pinctrl_set_state, | |
178 | }; | |
179 | ||
180 | int imx_pinctrl_probe(struct udevice *dev, | |
181 | struct imx_pinctrl_soc_info *info) | |
182 | { | |
183 | struct imx_pinctrl_priv *priv = dev_get_priv(dev); | |
e160f7d4 | 184 | int node = dev_of_offset(dev), ret; |
745df68d PF |
185 | struct fdtdec_phandle_args arg; |
186 | fdt_addr_t addr; | |
187 | fdt_size_t size; | |
188 | ||
189 | if (!info) { | |
190 | dev_err(dev, "wrong pinctrl info\n"); | |
191 | return -EINVAL; | |
192 | } | |
193 | ||
194 | priv->dev = dev; | |
195 | priv->info = info; | |
196 | ||
e160f7d4 SG |
197 | addr = fdtdec_get_addr_size(gd->fdt_blob, dev_of_offset(dev), "reg", |
198 | &size); | |
745df68d PF |
199 | |
200 | if (addr == FDT_ADDR_T_NONE) | |
201 | return -EINVAL; | |
202 | ||
203 | info->base = map_sysmem(addr, size); | |
204 | if (!info->base) | |
205 | return -ENOMEM; | |
206 | priv->info = info; | |
207 | ||
4aa9d4d0 | 208 | info->mux_mask = fdtdec_get_int(gd->fdt_blob, node, "fsl,mux_mask", 0); |
745df68d PF |
209 | /* |
210 | * Refer to linux documentation for details: | |
211 | * Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt | |
212 | */ | |
213 | if (fdtdec_get_bool(gd->fdt_blob, node, "fsl,input-sel")) { | |
214 | ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, | |
215 | node, "fsl,input-sel", | |
216 | NULL, 0, 0, &arg); | |
217 | if (ret) { | |
218 | dev_err(dev, "iomuxc fsl,input-sel property not found\n"); | |
219 | return -EINVAL; | |
220 | } | |
221 | ||
222 | addr = fdtdec_get_addr_size(gd->fdt_blob, arg.node, "reg", | |
223 | &size); | |
224 | if (addr == FDT_ADDR_T_NONE) | |
225 | return -EINVAL; | |
226 | ||
227 | info->input_sel_base = map_sysmem(addr, size); | |
228 | if (!info->input_sel_base) | |
229 | return -ENOMEM; | |
230 | } | |
231 | ||
5a6f8d7b | 232 | dev_dbg(dev, "initialized IMX pinctrl driver\n"); |
745df68d PF |
233 | |
234 | return 0; | |
235 | } | |
236 | ||
237 | int imx_pinctrl_remove(struct udevice *dev) | |
238 | { | |
239 | struct imx_pinctrl_priv *priv = dev_get_priv(dev); | |
240 | struct imx_pinctrl_soc_info *info = priv->info; | |
241 | ||
242 | if (info->input_sel_base) | |
243 | unmap_sysmem(info->input_sel_base); | |
244 | if (info->base) | |
245 | unmap_sysmem(info->base); | |
246 | ||
247 | return 0; | |
248 | } |