1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) EETS GmbH, 2017, Felix Brack <f.brack@eets.ch>
4 */
5
6 #include <common.h>
7 #include <dm.h>
8 #include <dm/pinctrl.h>
9 #include <linux/libfdt.h>
10 #include <asm/io.h>
11
12 DECLARE_GLOBAL_DATA_PTR;
13
14 struct single_pdata {
15 fdt_addr_t base; /* first configuration register */
16 int offset; /* index of last configuration register */
17 u32 mask; /* configuration-value mask bits */
18 int width; /* configuration register bit width */
19 bool bits_per_mux;
20 };
21
22 struct single_fdt_pin_cfg {
23 fdt32_t reg; /* configuration register offset */
24 fdt32_t val; /* configuration register value */
25 };
26
27 struct single_fdt_bits_cfg {
28 fdt32_t reg; /* configuration register offset */
29 fdt32_t val; /* configuration register value */
30 fdt32_t mask; /* configuration register mask */
31 };
32
33 /**
34 * single_configure_pins() - Configure pins based on FDT data
35 *
36 * @dev: Pointer to single pin configuration device which is the parent of
37 * the pins node holding the pin configuration data.
38 * @pins: Pointer to the first element of an array of register/value pairs
39 * of type 'struct single_fdt_pin_cfg'. Each such pair describes the
40 * the pin to be configured and the value to be used for configuration.
41 * This pointer points to a 'pinctrl-single,pins' property in the
42 * device-tree.
43 * @size: Size of the 'pins' array in bytes.
44 * The number of register/value pairs in the 'pins' array therefore
45 * equals to 'size / sizeof(struct single_fdt_pin_cfg)'.
46 */
single_configure_pins(struct udevice * dev,const struct single_fdt_pin_cfg * pins,int size)47 static int single_configure_pins(struct udevice *dev,
48 const struct single_fdt_pin_cfg *pins,
49 int size)
50 {
51 struct single_pdata *pdata = dev->platdata;
52 int count = size / sizeof(struct single_fdt_pin_cfg);
53 phys_addr_t n, reg;
54 u32 val;
55
56 for (n = 0; n < count; n++, pins++) {
57 reg = fdt32_to_cpu(pins->reg);
58 if ((reg < 0) || (reg > pdata->offset)) {
59 dev_dbg(dev, " invalid register offset 0x%pa\n", ®);
60 continue;
61 }
62 reg += pdata->base;
63 val = fdt32_to_cpu(pins->val) & pdata->mask;
64 switch (pdata->width) {
65 case 16:
66 writew((readw(reg) & ~pdata->mask) | val, reg);
67 break;
68 case 32:
69 writel((readl(reg) & ~pdata->mask) | val, reg);
70 break;
71 default:
72 dev_warn(dev, "unsupported register width %i\n",
73 pdata->width);
74 continue;
75 }
76 dev_dbg(dev, " reg/val 0x%pa/0x%08x\n", ®, val);
77 }
78 return 0;
79 }
80
single_configure_bits(struct udevice * dev,const struct single_fdt_bits_cfg * pins,int size)81 static int single_configure_bits(struct udevice *dev,
82 const struct single_fdt_bits_cfg *pins,
83 int size)
84 {
85 struct single_pdata *pdata = dev->platdata;
86 int count = size / sizeof(struct single_fdt_bits_cfg);
87 phys_addr_t n, reg;
88 u32 val, mask;
89
90 for (n = 0; n < count; n++, pins++) {
91 reg = fdt32_to_cpu(pins->reg);
92 if ((reg < 0) || (reg > pdata->offset)) {
93 dev_dbg(dev, " invalid register offset 0x%pa\n", ®);
94 continue;
95 }
96 reg += pdata->base;
97
98 mask = fdt32_to_cpu(pins->mask);
99 val = fdt32_to_cpu(pins->val) & mask;
100
101 switch (pdata->width) {
102 case 16:
103 writew((readw(reg) & ~mask) | val, reg);
104 break;
105 case 32:
106 writel((readl(reg) & ~mask) | val, reg);
107 break;
108 default:
109 dev_warn(dev, "unsupported register width %i\n",
110 pdata->width);
111 continue;
112 }
113 dev_dbg(dev, " reg/val 0x%pa/0x%08x\n", ®, val);
114 }
115 return 0;
116 }
single_set_state(struct udevice * dev,struct udevice * config)117 static int single_set_state(struct udevice *dev,
118 struct udevice *config)
119 {
120 const void *fdt = gd->fdt_blob;
121 const struct single_fdt_pin_cfg *prop;
122 const struct single_fdt_bits_cfg *prop_bits;
123 int len;
124
125 prop = fdt_getprop(fdt, dev_of_offset(config), "pinctrl-single,pins",
126 &len);
127
128 if (prop) {
129 dev_dbg(dev, "configuring pins for %s\n", config->name);
130 if (len % sizeof(struct single_fdt_pin_cfg)) {
131 dev_dbg(dev, " invalid pin configuration in fdt\n");
132 return -FDT_ERR_BADSTRUCTURE;
133 }
134 single_configure_pins(dev, prop, len);
135 return 0;
136 }
137
138 /* pinctrl-single,pins not found so check for pinctrl-single,bits */
139 prop_bits = fdt_getprop(fdt, dev_of_offset(config),
140 "pinctrl-single,bits",
141 &len);
142 if (prop_bits) {
143 dev_dbg(dev, "configuring pins for %s\n", config->name);
144 if (len % sizeof(struct single_fdt_bits_cfg)) {
145 dev_dbg(dev, " invalid bits configuration in fdt\n");
146 return -FDT_ERR_BADSTRUCTURE;
147 }
148 single_configure_bits(dev, prop_bits, len);
149 return 0;
150 }
151
152 /* Neither 'pinctrl-single,pins' nor 'pinctrl-single,bits' were found */
153 return len;
154 }
155
single_ofdata_to_platdata(struct udevice * dev)156 static int single_ofdata_to_platdata(struct udevice *dev)
157 {
158 fdt_addr_t addr;
159 u32 of_reg[2];
160 int res;
161 struct single_pdata *pdata = dev->platdata;
162
163 pdata->width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
164 "pinctrl-single,register-width", 0);
165
166 res = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
167 "reg", of_reg, 2);
168 if (res)
169 return res;
170 pdata->offset = of_reg[1] - pdata->width / 8;
171
172 addr = devfdt_get_addr(dev);
173 if (addr == FDT_ADDR_T_NONE) {
174 dev_dbg(dev, "no valid base register address\n");
175 return -EINVAL;
176 }
177 pdata->base = addr;
178
179 pdata->mask = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
180 "pinctrl-single,function-mask",
181 0xffffffff);
182 pdata->bits_per_mux = fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
183 "pinctrl-single,bit-per-mux");
184
185 return 0;
186 }
187
188 const struct pinctrl_ops single_pinctrl_ops = {
189 .set_state = single_set_state,
190 };
191
192 static const struct udevice_id single_pinctrl_match[] = {
193 { .compatible = "pinctrl-single" },
194 { /* sentinel */ }
195 };
196
197 U_BOOT_DRIVER(single_pinctrl) = {
198 .name = "single-pinctrl",
199 .id = UCLASS_PINCTRL,
200 .of_match = single_pinctrl_match,
201 .ops = &single_pinctrl_ops,
202 .platdata_auto_alloc_size = sizeof(struct single_pdata),
203 .ofdata_to_platdata = single_ofdata_to_platdata,
204 };
205