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u-boot/drivers/gpio/gpio-aspeed.c
Andrew Jeffery 7ad889b0f3 gpio: Add Aspeed GPIO driver 
The Aspeed GPIO driver supports the GPIO controllers found in the
AST2400, AST2500 and AST2600 BMC SoCs. The implementation is a cut-down
copy of the upstream Linux kernel driver, adapted for u-boot.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
2022-03-07 11:36:12 -05:00

299 lines
7.2 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2015 IBM Corp.
* Joel Stanley <joel@jms.id.au>
* Ryan Chen <ryan_chen@aspeedtech.com>
*
* Implementation extracted from the Linux kernel and adapted for u-boot.
*/
#include <common.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <config.h>
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <asm/io.h>
#include <linux/bug.h>
#include <linux/sizes.h>
struct aspeed_gpio_priv {
void *regs;
};
struct aspeed_gpio_bank {
u16 val_regs; /* +0: Rd: read input value, Wr: set write latch
* +4: Rd/Wr: Direction (0=in, 1=out)
*/
u16 rdata_reg; /* Rd: read write latch, Wr: <none> */
u16 irq_regs;
u16 debounce_regs;
u16 tolerance_regs;
u16 cmdsrc_regs;
const char names[4][3];
};
static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
{
.val_regs = 0x0000,
.rdata_reg = 0x00c0,
.irq_regs = 0x0008,
.debounce_regs = 0x0040,
.tolerance_regs = 0x001c,
.cmdsrc_regs = 0x0060,
.names = { "A", "B", "C", "D" },
},
{
.val_regs = 0x0020,
.rdata_reg = 0x00c4,
.irq_regs = 0x0028,
.debounce_regs = 0x0048,
.tolerance_regs = 0x003c,
.cmdsrc_regs = 0x0068,
.names = { "E", "F", "G", "H" },
},
{
.val_regs = 0x0070,
.rdata_reg = 0x00c8,
.irq_regs = 0x0098,
.debounce_regs = 0x00b0,
.tolerance_regs = 0x00ac,
.cmdsrc_regs = 0x0090,
.names = { "I", "J", "K", "L" },
},
{
.val_regs = 0x0078,
.rdata_reg = 0x00cc,
.irq_regs = 0x00e8,
.debounce_regs = 0x0100,
.tolerance_regs = 0x00fc,
.cmdsrc_regs = 0x00e0,
.names = { "M", "N", "O", "P" },
},
{
.val_regs = 0x0080,
.rdata_reg = 0x00d0,
.irq_regs = 0x0118,
.debounce_regs = 0x0130,
.tolerance_regs = 0x012c,
.cmdsrc_regs = 0x0110,
.names = { "Q", "R", "S", "T" },
},
{
.val_regs = 0x0088,
.rdata_reg = 0x00d4,
.irq_regs = 0x0148,
.debounce_regs = 0x0160,
.tolerance_regs = 0x015c,
.cmdsrc_regs = 0x0140,
.names = { "U", "V", "W", "X" },
},
{
.val_regs = 0x01E0,
.rdata_reg = 0x00d8,
.irq_regs = 0x0178,
.debounce_regs = 0x0190,
.tolerance_regs = 0x018c,
.cmdsrc_regs = 0x0170,
.names = { "Y", "Z", "AA", "AB" },
},
{
.val_regs = 0x01e8,
.rdata_reg = 0x00dc,
.irq_regs = 0x01a8,
.debounce_regs = 0x01c0,
.tolerance_regs = 0x01bc,
.cmdsrc_regs = 0x01a0,
.names = { "AC", "", "", "" },
},
};
enum aspeed_gpio_reg {
reg_val,
reg_rdata,
reg_dir,
reg_irq_enable,
reg_irq_type0,
reg_irq_type1,
reg_irq_type2,
reg_irq_status,
reg_debounce_sel1,
reg_debounce_sel2,
reg_tolerance,
reg_cmdsrc0,
reg_cmdsrc1,
};
#define GPIO_VAL_VALUE 0x00
#define GPIO_VAL_DIR 0x04
#define GPIO_IRQ_ENABLE 0x00
#define GPIO_IRQ_TYPE0 0x04
#define GPIO_IRQ_TYPE1 0x08
#define GPIO_IRQ_TYPE2 0x0c
#define GPIO_IRQ_STATUS 0x10
#define GPIO_DEBOUNCE_SEL1 0x00
#define GPIO_DEBOUNCE_SEL2 0x04
#define GPIO_CMDSRC_0 0x00
#define GPIO_CMDSRC_1 0x04
#define GPIO_CMDSRC_ARM 0
#define GPIO_CMDSRC_LPC 1
#define GPIO_CMDSRC_COLDFIRE 2
#define GPIO_CMDSRC_RESERVED 3
/* This will be resolved at compile time */
static inline void __iomem *bank_reg(struct aspeed_gpio_priv *gpio,
const struct aspeed_gpio_bank *bank,
const enum aspeed_gpio_reg reg)
{
switch (reg) {
case reg_val:
return gpio->regs + bank->val_regs + GPIO_VAL_VALUE;
case reg_rdata:
return gpio->regs + bank->rdata_reg;
case reg_dir:
return gpio->regs + bank->val_regs + GPIO_VAL_DIR;
case reg_irq_enable:
return gpio->regs + bank->irq_regs + GPIO_IRQ_ENABLE;
case reg_irq_type0:
return gpio->regs + bank->irq_regs + GPIO_IRQ_TYPE0;
case reg_irq_type1:
return gpio->regs + bank->irq_regs + GPIO_IRQ_TYPE1;
case reg_irq_type2:
return gpio->regs + bank->irq_regs + GPIO_IRQ_TYPE2;
case reg_irq_status:
return gpio->regs + bank->irq_regs + GPIO_IRQ_STATUS;
case reg_debounce_sel1:
return gpio->regs + bank->debounce_regs + GPIO_DEBOUNCE_SEL1;
case reg_debounce_sel2:
return gpio->regs + bank->debounce_regs + GPIO_DEBOUNCE_SEL2;
case reg_tolerance:
return gpio->regs + bank->tolerance_regs;
case reg_cmdsrc0:
return gpio->regs + bank->cmdsrc_regs + GPIO_CMDSRC_0;
case reg_cmdsrc1:
return gpio->regs + bank->cmdsrc_regs + GPIO_CMDSRC_1;
}
BUG();
}
#define GPIO_BANK(x) ((x) >> 5)
#define GPIO_OFFSET(x) ((x) & 0x1f)
#define GPIO_BIT(x) BIT(GPIO_OFFSET(x))
static const struct aspeed_gpio_bank *to_bank(unsigned int offset)
{
unsigned int bank = GPIO_BANK(offset);
WARN_ON(bank >= ARRAY_SIZE(aspeed_gpio_banks));
return &aspeed_gpio_banks[bank];
}
static int
aspeed_gpio_direction_input(struct udevice *dev, unsigned int offset)
{
struct aspeed_gpio_priv *priv = dev_get_priv(dev);
const struct aspeed_gpio_bank *bank = to_bank(offset);
u32 dir = readl(bank_reg(priv, bank, reg_dir));
dir &= ~GPIO_BIT(offset);
writel(dir, bank_reg(priv, bank, reg_dir));
return 0;
}
static int aspeed_gpio_direction_output(struct udevice *dev, unsigned int offset,
int value)
{
struct aspeed_gpio_priv *priv = dev_get_priv(dev);
const struct aspeed_gpio_bank *bank = to_bank(offset);
u32 dir = readl(bank_reg(priv, bank, reg_dir));
u32 output = readl(bank_reg(priv, bank, reg_val));
dir |= GPIO_BIT(offset);
writel(dir, bank_reg(priv, bank, reg_dir));
if (value)
output |= GPIO_BIT(offset);
else
output &= ~GPIO_BIT(offset);
writel(output, bank_reg(priv, bank, reg_val));
return 0;
}
static int aspeed_gpio_get_value(struct udevice *dev, unsigned int offset)
{
struct aspeed_gpio_priv *priv = dev_get_priv(dev);
const struct aspeed_gpio_bank *bank = to_bank(offset);
return !!(readl(bank_reg(priv, bank, reg_val)) & GPIO_BIT(offset));
}
static int
aspeed_gpio_set_value(struct udevice *dev, unsigned int offset, int value)
{
struct aspeed_gpio_priv *priv = dev_get_priv(dev);
const struct aspeed_gpio_bank *bank = to_bank(offset);
u32 data = readl(bank_reg(priv, bank, reg_val));
if (value)
data |= GPIO_BIT(offset);
else
data &= ~GPIO_BIT(offset);
writel(data, bank_reg(priv, bank, reg_val));
return 0;
}
static int aspeed_gpio_get_function(struct udevice *dev, unsigned int offset)
{
struct aspeed_gpio_priv *priv = dev_get_priv(dev);
const struct aspeed_gpio_bank *bank = to_bank(offset);
if (readl(bank_reg(priv, bank, reg_dir)) & GPIO_BIT(offset))
return GPIOF_OUTPUT;
return GPIOF_INPUT;
}
static const struct dm_gpio_ops aspeed_gpio_ops = {
.direction_input = aspeed_gpio_direction_input,
.direction_output = aspeed_gpio_direction_output,
.get_value = aspeed_gpio_get_value,
.set_value = aspeed_gpio_set_value,
.get_function = aspeed_gpio_get_function,
};
static int aspeed_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct aspeed_gpio_priv *priv = dev_get_priv(dev);
uc_priv->bank_name = dev->name;
ofnode_read_u32(dev_ofnode(dev), "ngpios", &uc_priv->gpio_count);
priv->regs = devfdt_get_addr_ptr(dev);
return 0;
}
static const struct udevice_id aspeed_gpio_ids[] = {
{ .compatible = "aspeed,ast2400-gpio", },
{ .compatible = "aspeed,ast2500-gpio", },
{ .compatible = "aspeed,ast2600-gpio", },
{ }
};
U_BOOT_DRIVER(gpio_aspeed) = {
.name = "gpio-aspeed",
.id = UCLASS_GPIO,
.of_match = aspeed_gpio_ids,
.ops = &aspeed_gpio_ops,
.probe = aspeed_gpio_probe,
.priv_auto = sizeof(struct aspeed_gpio_priv),
};
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