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 };
20
21 struct single_fdt_pin_cfg {
22 fdt32_t reg; /* configuration register offset */
23 fdt32_t val; /* configuration register value */
24 };
25
26 /**
27 * single_configure_pins() - Configure pins based on FDT data
28 *
29 * @dev: Pointer to single pin configuration device which is the parent of
30 * the pins node holding the pin configuration data.
31 * @pins: Pointer to the first element of an array of register/value pairs
32 * of type 'struct single_fdt_pin_cfg'. Each such pair describes the
33 * the pin to be configured and the value to be used for configuration.
34 * This pointer points to a 'pinctrl-single,pins' property in the
35 * device-tree.
36 * @size: Size of the 'pins' array in bytes.
37 * The number of register/value pairs in the 'pins' array therefore
38 * equals to 'size / sizeof(struct single_fdt_pin_cfg)'.
39 */
single_configure_pins(struct udevice * dev,const struct single_fdt_pin_cfg * pins,int size)40 static int single_configure_pins(struct udevice *dev,
41 const struct single_fdt_pin_cfg *pins,
42 int size)
43 {
44 struct single_pdata *pdata = dev->platdata;
45 int count = size / sizeof(struct single_fdt_pin_cfg);
46 phys_addr_t n, reg;
47 u32 val;
48
49 for (n = 0; n < count; n++, pins++) {
50 reg = fdt32_to_cpu(pins->reg);
51 if ((reg < 0) || (reg > pdata->offset)) {
52 dev_dbg(dev, " invalid register offset 0x%pa\n", ®);
53 continue;
54 }
55 reg += pdata->base;
56 val = fdt32_to_cpu(pins->val) & pdata->mask;
57 switch (pdata->width) {
58 case 16:
59 writew((readw(reg) & ~pdata->mask) | val, reg);
60 break;
61 case 32:
62 writel((readl(reg) & ~pdata->mask) | val, reg);
63 break;
64 default:
65 dev_warn(dev, "unsupported register width %i\n",
66 pdata->width);
67 continue;
68 }
69 dev_dbg(dev, " reg/val 0x%pa/0x%08x\n", ®, val);
70 }
71 return 0;
72 }
73
single_set_state(struct udevice * dev,struct udevice * config)74 static int single_set_state(struct udevice *dev,
75 struct udevice *config)
76 {
77 const void *fdt = gd->fdt_blob;
78 const struct single_fdt_pin_cfg *prop;
79 int len;
80
81 prop = fdt_getprop(fdt, dev_of_offset(config), "pinctrl-single,pins",
82 &len);
83 if (prop) {
84 dev_dbg(dev, "configuring pins for %s\n", config->name);
85 if (len % sizeof(struct single_fdt_pin_cfg)) {
86 dev_dbg(dev, " invalid pin configuration in fdt\n");
87 return -FDT_ERR_BADSTRUCTURE;
88 }
89 single_configure_pins(dev, prop, len);
90 len = 0;
91 }
92
93 return len;
94 }
95
single_ofdata_to_platdata(struct udevice * dev)96 static int single_ofdata_to_platdata(struct udevice *dev)
97 {
98 fdt_addr_t addr;
99 u32 of_reg[2];
100 int res;
101 struct single_pdata *pdata = dev->platdata;
102
103 pdata->width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
104 "pinctrl-single,register-width", 0);
105
106 res = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
107 "reg", of_reg, 2);
108 if (res)
109 return res;
110 pdata->offset = of_reg[1] - pdata->width / 8;
111
112 addr = devfdt_get_addr(dev);
113 if (addr == FDT_ADDR_T_NONE) {
114 dev_dbg(dev, "no valid base register address\n");
115 return -EINVAL;
116 }
117 pdata->base = addr;
118
119 pdata->mask = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
120 "pinctrl-single,function-mask",
121 0xffffffff);
122 return 0;
123 }
124
125 const struct pinctrl_ops single_pinctrl_ops = {
126 .set_state = single_set_state,
127 };
128
129 static const struct udevice_id single_pinctrl_match[] = {
130 { .compatible = "pinctrl-single" },
131 { /* sentinel */ }
132 };
133
134 U_BOOT_DRIVER(single_pinctrl) = {
135 .name = "single-pinctrl",
136 .id = UCLASS_PINCTRL,
137 .of_match = single_pinctrl_match,
138 .ops = &single_pinctrl_ops,
139 .platdata_auto_alloc_size = sizeof(struct single_pdata),
140 .ofdata_to_platdata = single_ofdata_to_platdata,
141 };
142