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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2018 Emlid Limited
*/
#include <common.h>
#include <dm.h>
#include <dm/pinctrl.h>
#include <dm/read.h>
#include <regmap.h>
#include <syscon.h>
#include <asm/cpu.h>
#include <asm/scu.h>
#include <linux/io.h>
#define BUFCFG_OFFSET 0x100
#define MRFLD_FAMILY_LEN 0x400
/* These are taken from Linux kernel */
#define MRFLD_PINMODE_MASK 0x07
#define pin_to_bufno(f, p) ((p) - (f)->pin_base)
struct mrfld_family {
unsigned int family_number;
unsigned int pin_base;
size_t npins;
void __iomem *regs;
};
#define MRFLD_FAMILY(b, s, e) \
{ \
.family_number = (b), \
.pin_base = (s), \
.npins = (e) - (s) + 1, \
}
/* Now we only support I2C family of pins */
static struct mrfld_family mrfld_families[] = {
MRFLD_FAMILY(7, 101, 114),
};
struct mrfld_pinctrl {
const struct mrfld_family *families;
size_t nfamilies;
};
static const struct mrfld_family *
mrfld_get_family(struct mrfld_pinctrl *mp, unsigned int pin)
{
const struct mrfld_family *family;
unsigned int i;
for (i = 0; i < mp->nfamilies; i++) {
family = &mp->families[i];
if (pin >= family->pin_base &&
pin < family->pin_base + family->npins)
return family;
}
pr_err("failed to find family for pin %u\n", pin);
return NULL;
}
static void __iomem *
mrfld_get_bufcfg(struct mrfld_pinctrl *pinctrl, unsigned int pin)
{
const struct mrfld_family *family;
unsigned int bufno;
family = mrfld_get_family(pinctrl, pin);
if (!family)
return NULL;
bufno = pin_to_bufno(family, pin);
return family->regs + BUFCFG_OFFSET + bufno * 4;
}
static void
mrfld_setup_families(void *base_addr,
struct mrfld_family *families, unsigned int nfam)
{
for (int i = 0; i < nfam; i++) {
struct mrfld_family *family = &families[i];
family->regs = base_addr +
family->family_number * MRFLD_FAMILY_LEN;
}
}
static int mrfld_pinconfig_protected(unsigned int pin, u32 mask, u32 bits)
{
struct mrfld_pinctrl *pinctrl;
struct udevice *dev;
void __iomem *bufcfg;
u32 v, value;
int ret;
ret = syscon_get_by_driver_data(X86_SYSCON_PINCONF, &dev);
if (ret)
return ret;
pinctrl = dev_get_priv(dev);
bufcfg = mrfld_get_bufcfg(pinctrl, pin);
if (!bufcfg)
return -EINVAL;
value = readl(bufcfg);
v = (value & ~mask) | (bits & mask);
debug("scu: v: 0x%x p: 0x%x bits: %d, mask: %d bufcfg: 0x%p\n",
v, (u32)bufcfg, bits, mask, bufcfg);
ret = scu_ipc_raw_command(IPCMSG_INDIRECT_WRITE, 0, &v, 4,
NULL, 0, (u32)bufcfg, 0);
if (ret)
pr_err("Failed to set mode via SCU for pin %u (%d)\n",
pin, ret);
return ret;
}
static int mrfld_pinctrl_cfg_pin(ofnode pin_node)
{
bool is_protected;
int pad_offset;
int mode;
u32 mask;
int ret;
/* For now we only support just protected Family of pins */
is_protected = ofnode_read_bool(pin_node, "protected");
if (!is_protected)
return -ENOTSUPP;
pad_offset = ofnode_read_s32_default(pin_node, "pad-offset", -1);
if (pad_offset == -1)
return -EINVAL;
mode = ofnode_read_s32_default(pin_node, "mode-func", -1);
if (mode == -1)
return -EINVAL;
mask = MRFLD_PINMODE_MASK;
/* We don't support modes not in range 0..7 */
if (mode & ~mask)
return -ENOTSUPP;
ret = mrfld_pinconfig_protected(pad_offset, mask, mode);
return ret;
}
static int tangier_pinctrl_probe(struct udevice *dev)
{
void *base_addr = syscon_get_first_range(X86_SYSCON_PINCONF);
struct mrfld_pinctrl *pinctrl = dev_get_priv(dev);
ofnode pin_node;
int ret;
mrfld_setup_families(base_addr, mrfld_families,
ARRAY_SIZE(mrfld_families));
pinctrl->families = mrfld_families;
pinctrl->nfamilies = ARRAY_SIZE(mrfld_families);
ofnode_for_each_subnode(pin_node, dev_ofnode(dev)) {
ret = mrfld_pinctrl_cfg_pin(pin_node);
if (ret) {
pr_err("%s: invalid configuration for the pin %ld\n",
__func__, pin_node.of_offset);
}
}
return 0;
}
static const struct udevice_id tangier_pinctrl_match[] = {
{ .compatible = "intel,pinctrl-tangier", .data = X86_SYSCON_PINCONF },
{ /* sentinel */ }
};
U_BOOT_DRIVER(tangier_pinctrl) = {
.name = "tangier_pinctrl",
.id = UCLASS_SYSCON,
.of_match = tangier_pinctrl_match,
.probe = tangier_pinctrl_probe,
.priv_auto_alloc_size = sizeof(struct mrfld_pinctrl),
};
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