mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 00:48:52 +09:00
196 lines
4.2 KiB
C
196 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2018 Emlid Limited
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <log.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),
|
|
};
|