mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-19 03:08:31 +00:00
a821c4af79
These support the flat device tree. We want to use the dev_read_..() prefix for functions that support both flat tree and live tree. So rename the existing functions to avoid confusion. In the end we will have: 1. dev_read_addr...() - works on devices, supports flat/live tree 2. devfdt_get_addr...() - current functions, flat tree only 3. of_get_address() etc. - new functions, live tree only All drivers will be written to use 1. That function will in turn call either 2 or 3 depending on whether the flat or live tree is in use. Note this involves changing some dead code - the imx_lpi2c.c file. Signed-off-by: Simon Glass <sjg@chromium.org>
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/*
|
|
* Exynos pinctrl driver common code.
|
|
* Copyright (C) 2016 Samsung Electronics
|
|
* Thomas Abraham <thomas.ab@samsung.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <asm/io.h>
|
|
#include "pinctrl-exynos.h"
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/**
|
|
* exynos_pinctrl_setup_peri: setup pinctrl for a peripheral.
|
|
* conf: soc specific pin configuration data array
|
|
* num_conf: number of configurations in the conf array.
|
|
* base: base address of the pin controller.
|
|
*/
|
|
void exynos_pinctrl_setup_peri(struct exynos_pinctrl_config_data *conf,
|
|
unsigned int num_conf, unsigned long base)
|
|
{
|
|
unsigned int idx, val;
|
|
|
|
for (idx = 0; idx < num_conf; idx++) {
|
|
val = readl(base + conf[idx].offset);
|
|
val &= ~(conf[idx].mask);
|
|
val |= conf[idx].value;
|
|
writel(val, base + conf[idx].offset);
|
|
}
|
|
}
|
|
|
|
/* given a pin-name, return the address of pin config registers */
|
|
static unsigned long pin_to_bank_base(struct udevice *dev, const char *pin_name,
|
|
u32 *pin)
|
|
{
|
|
struct exynos_pinctrl_priv *priv = dev_get_priv(dev);
|
|
const struct samsung_pin_ctrl *pin_ctrl = priv->pin_ctrl;
|
|
const struct samsung_pin_bank_data *bank_data = pin_ctrl->pin_banks;
|
|
u32 nr_banks = pin_ctrl->nr_banks, idx = 0;
|
|
char bank[10];
|
|
|
|
/*
|
|
* The format of the pin name is <bank name>-<pin_number>.
|
|
* Example: gpa0-4 (gpa0 is the bank name and 4 is the pin number.
|
|
*/
|
|
while (pin_name[idx] != '-') {
|
|
bank[idx] = pin_name[idx];
|
|
idx++;
|
|
}
|
|
bank[idx] = '\0';
|
|
*pin = pin_name[++idx] - '0';
|
|
|
|
/* lookup the pin bank data using the pin bank name */
|
|
for (idx = 0; idx < nr_banks; idx++)
|
|
if (!strcmp(bank, bank_data[idx].name))
|
|
break;
|
|
|
|
return priv->base + bank_data[idx].offset;
|
|
}
|
|
|
|
/**
|
|
* exynos_pinctrl_set_state: configure a pin state.
|
|
* dev: the pinctrl device to be configured.
|
|
* config: the state to be configured.
|
|
*/
|
|
int exynos_pinctrl_set_state(struct udevice *dev, struct udevice *config)
|
|
{
|
|
const void *fdt = gd->fdt_blob;
|
|
int node = dev_of_offset(config);
|
|
unsigned int count, idx, pin_num;
|
|
unsigned int pinfunc, pinpud, pindrv;
|
|
unsigned long reg, value;
|
|
const char *name;
|
|
|
|
/*
|
|
* refer to the following document for the pinctrl bindings
|
|
* linux/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
|
|
*/
|
|
count = fdt_stringlist_count(fdt, node, "samsung,pins");
|
|
if (count <= 0)
|
|
return -EINVAL;
|
|
|
|
pinfunc = fdtdec_get_int(fdt, node, "samsung,pin-function", -1);
|
|
pinpud = fdtdec_get_int(fdt, node, "samsung,pin-pud", -1);
|
|
pindrv = fdtdec_get_int(fdt, node, "samsung,pin-drv", -1);
|
|
|
|
for (idx = 0; idx < count; idx++) {
|
|
name = fdt_stringlist_get(fdt, node, "samsung,pins", idx, NULL);
|
|
if (!name)
|
|
continue;
|
|
reg = pin_to_bank_base(dev, name, &pin_num);
|
|
|
|
if (pinfunc != -1) {
|
|
value = readl(reg + PIN_CON);
|
|
value &= ~(0xf << (pin_num << 2));
|
|
value |= (pinfunc << (pin_num << 2));
|
|
writel(value, reg + PIN_CON);
|
|
}
|
|
|
|
if (pinpud != -1) {
|
|
value = readl(reg + PIN_PUD);
|
|
value &= ~(0x3 << (pin_num << 1));
|
|
value |= (pinpud << (pin_num << 1));
|
|
writel(value, reg + PIN_PUD);
|
|
}
|
|
|
|
if (pindrv != -1) {
|
|
value = readl(reg + PIN_DRV);
|
|
value &= ~(0x3 << (pin_num << 1));
|
|
value |= (pindrv << (pin_num << 1));
|
|
writel(value, reg + PIN_DRV);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int exynos_pinctrl_probe(struct udevice *dev)
|
|
{
|
|
struct exynos_pinctrl_priv *priv;
|
|
fdt_addr_t base;
|
|
|
|
priv = dev_get_priv(dev);
|
|
if (!priv)
|
|
return -EINVAL;
|
|
|
|
base = devfdt_get_addr(dev);
|
|
if (base == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
priv->base = base;
|
|
priv->pin_ctrl = (struct samsung_pin_ctrl *)dev_get_driver_data(dev) +
|
|
dev->req_seq;
|
|
|
|
return 0;
|
|
}
|