2 * Copyright (C) EETS GmbH, 2017, Felix Brack <f.brack@eets.ch>
4 * SPDX-License-Identifier: GPL-2.0+
9 #include <dm/pinctrl.h>
10 #include <linux/libfdt.h>
13 DECLARE_GLOBAL_DATA_PTR;
16 fdt_addr_t base; /* first configuration register */
17 int offset; /* index of last configuration register */
18 u32 mask; /* configuration-value mask bits */
19 int width; /* configuration register bit width */
22 struct single_fdt_pin_cfg {
23 fdt32_t reg; /* configuration register offset */
24 fdt32_t val; /* configuration register value */
28 * single_configure_pins() - Configure pins based on FDT data
30 * @dev: Pointer to single pin configuration device which is the parent of
31 * the pins node holding the pin configuration data.
32 * @pins: Pointer to the first element of an array of register/value pairs
33 * of type 'struct single_fdt_pin_cfg'. Each such pair describes the
34 * the pin to be configured and the value to be used for configuration.
35 * This pointer points to a 'pinctrl-single,pins' property in the
37 * @size: Size of the 'pins' array in bytes.
38 * The number of register/value pairs in the 'pins' array therefore
39 * equals to 'size / sizeof(struct single_fdt_pin_cfg)'.
41 static int single_configure_pins(struct udevice *dev,
42 const struct single_fdt_pin_cfg *pins,
45 struct single_pdata *pdata = dev->platdata;
46 int count = size / sizeof(struct single_fdt_pin_cfg);
50 for (n = 0; n < count; n++, pins++) {
51 reg = fdt32_to_cpu(pins->reg);
52 if ((reg < 0) || (reg > pdata->offset)) {
53 dev_dbg(dev, " invalid register offset 0x%08x\n", reg);
57 val = fdt32_to_cpu(pins->val) & pdata->mask;
58 switch (pdata->width) {
60 writew((readw(reg) & ~pdata->mask) | val, reg);
63 writel((readl(reg) & ~pdata->mask) | val, reg);
66 dev_warn(dev, "unsupported register width %i\n",
70 dev_dbg(dev, " reg/val 0x%08x/0x%08x\n",reg, val);
75 static int single_set_state(struct udevice *dev,
76 struct udevice *config)
78 const void *fdt = gd->fdt_blob;
79 const struct single_fdt_pin_cfg *prop;
82 prop = fdt_getprop(fdt, dev_of_offset(config), "pinctrl-single,pins",
85 dev_dbg(dev, "configuring pins for %s\n", config->name);
86 if (len % sizeof(struct single_fdt_pin_cfg)) {
87 dev_dbg(dev, " invalid pin configuration in fdt\n");
88 return -FDT_ERR_BADSTRUCTURE;
90 single_configure_pins(dev, prop, len);
97 static int single_ofdata_to_platdata(struct udevice *dev)
102 struct single_pdata *pdata = dev->platdata;
104 pdata->width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
105 "pinctrl-single,register-width", 0);
107 res = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
111 pdata->offset = of_reg[1] - pdata->width / 8;
113 addr = devfdt_get_addr(dev);
114 if (addr == FDT_ADDR_T_NONE) {
115 dev_dbg(dev, "no valid base register address\n");
120 pdata->mask = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
121 "pinctrl-single,function-mask",
126 const struct pinctrl_ops single_pinctrl_ops = {
127 .set_state = single_set_state,
130 static const struct udevice_id single_pinctrl_match[] = {
131 { .compatible = "pinctrl-single" },
135 U_BOOT_DRIVER(single_pinctrl) = {
136 .name = "single-pinctrl",
137 .id = UCLASS_PINCTRL,
138 .of_match = single_pinctrl_match,
139 .ops = &single_pinctrl_ops,
140 .flags = DM_FLAG_PRE_RELOC,
141 .platdata_auto_alloc_size = sizeof(struct single_pdata),
142 .ofdata_to_platdata = single_ofdata_to_platdata,