1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2018 Emlid Limited
9 #include <dm/pinctrl.h>
17 #define BUFCFG_OFFSET 0x100
19 #define MRFLD_FAMILY_LEN 0x400
21 /* These are taken from Linux kernel */
22 #define MRFLD_PINMODE_MASK 0x07
24 #define pin_to_bufno(f, p) ((p) - (f)->pin_base)
27 unsigned int family_number;
28 unsigned int pin_base;
33 #define MRFLD_FAMILY(b, s, e) \
35 .family_number = (b), \
37 .npins = (e) - (s) + 1, \
40 /* Now we only support SD/SDIO and I2C families of pins */
41 static struct mrfld_family mrfld_families[] = {
42 MRFLD_FAMILY(3, 37, 56),
43 MRFLD_FAMILY(7, 101, 114),
46 struct mrfld_pinctrl {
47 const struct mrfld_family *families;
51 static const struct mrfld_family *
52 mrfld_get_family(struct mrfld_pinctrl *mp, unsigned int pin)
54 const struct mrfld_family *family;
57 for (i = 0; i < mp->nfamilies; i++) {
58 family = &mp->families[i];
59 if (pin >= family->pin_base &&
60 pin < family->pin_base + family->npins)
64 pr_err("failed to find family for pin %u\n", pin);
69 mrfld_get_bufcfg(struct mrfld_pinctrl *pinctrl, unsigned int pin)
71 const struct mrfld_family *family;
74 family = mrfld_get_family(pinctrl, pin);
78 bufno = pin_to_bufno(family, pin);
80 return family->regs + BUFCFG_OFFSET + bufno * 4;
84 mrfld_setup_families(void *base_addr,
85 struct mrfld_family *families, unsigned int nfam)
87 for (int i = 0; i < nfam; i++) {
88 struct mrfld_family *family = &families[i];
90 family->regs = base_addr +
91 family->family_number * MRFLD_FAMILY_LEN;
95 static int mrfld_pinconfig_protected(unsigned int pin, u32 mask, u32 bits)
97 struct mrfld_pinctrl *pinctrl;
103 ret = syscon_get_by_driver_data(X86_SYSCON_PINCONF, &dev);
107 pinctrl = dev_get_priv(dev);
109 bufcfg = mrfld_get_bufcfg(pinctrl, pin);
113 value = readl(bufcfg);
115 v = (value & ~mask) | (bits & mask);
117 debug("scu: v: 0x%x p: 0x%x bits: %d, mask: %d bufcfg: 0x%p\n",
118 v, (u32)bufcfg, bits, mask, bufcfg);
120 ret = scu_ipc_raw_command(IPCMSG_INDIRECT_WRITE, 0, &v, 4,
121 NULL, 0, (u32)bufcfg, 0);
123 pr_err("Failed to set mode via SCU for pin %u (%d)\n",
129 static int mrfld_pinconfig(unsigned int pin, u32 mask, u32 bits)
131 struct mrfld_pinctrl *pinctrl;
133 void __iomem *bufcfg;
137 ret = syscon_get_by_driver_data(X86_SYSCON_PINCONF, &dev);
141 pinctrl = dev_get_priv(dev);
143 bufcfg = mrfld_get_bufcfg(pinctrl, pin);
147 value = readl(bufcfg);
148 v = (value & ~mask) | (bits & mask);
151 debug("v: 0x%x p: 0x%x bits: %d, mask: %d bufcfg: 0x%p\n",
152 v, (u32)bufcfg, bits, mask, bufcfg);
157 static int mrfld_pinctrl_cfg_pin(ofnode pin_node)
165 is_protected = ofnode_read_bool(pin_node, "protected");
167 pad_offset = ofnode_read_s32_default(pin_node, "pad-offset", -1);
168 if (pad_offset == -1)
171 mode = ofnode_read_s32_default(pin_node, "mode-func", -1);
175 mask = MRFLD_PINMODE_MASK;
177 /* We don't support modes not in range 0..7 */
182 ret = mrfld_pinconfig_protected(pad_offset, mask, mode);
184 ret = mrfld_pinconfig(pad_offset, mask, mode);
189 static int tangier_pinctrl_probe(struct udevice *dev)
191 void *base_addr = syscon_get_first_range(X86_SYSCON_PINCONF);
192 struct mrfld_pinctrl *pinctrl = dev_get_priv(dev);
196 mrfld_setup_families(base_addr, mrfld_families,
197 ARRAY_SIZE(mrfld_families));
199 pinctrl->families = mrfld_families;
200 pinctrl->nfamilies = ARRAY_SIZE(mrfld_families);
202 ofnode_for_each_subnode(pin_node, dev_ofnode(dev)) {
203 ret = mrfld_pinctrl_cfg_pin(pin_node);
205 pr_err("%s: invalid configuration for the pin %ld\n",
206 __func__, pin_node.of_offset);
213 static const struct udevice_id tangier_pinctrl_match[] = {
214 { .compatible = "intel,pinctrl-tangier", .data = X86_SYSCON_PINCONF },
218 U_BOOT_DRIVER(tangier_pinctrl) = {
219 .name = "tangier_pinctrl",
221 .of_match = tangier_pinctrl_match,
222 .probe = tangier_pinctrl_probe,
223 .priv_auto = sizeof(struct mrfld_pinctrl),