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gpio: aspeed: Rework register type accessors

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Use a single accessor function for all register types instead
of several spread around. This will make it easier/cleaner
to introduce new registers and keep the mechanism in one
place.

The big switch/case is optimized at compile time since the
switch value is a constant.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Benjamin Herrenschmidt 2018-06-29 14:11:16 +10:00 committed by Linus Walleij
parent ce397d215c
commit 44ddf559d5
1 changed files with 69 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

118
drivers/gpio/gpio-aspeed.c
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@ -127,12 +127,21 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
},
};
#define GPIO_BANK(x) ((x) >> 5)
#define GPIO_OFFSET(x) ((x) & 0x1f)
#define GPIO_BIT(x) BIT(GPIO_OFFSET(x))
enum aspeed_gpio_reg {
reg_val,
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,
};
#define GPIO_DATA 0x00
#define GPIO_DIR 0x04
#define GPIO_VAL_VALUE 0x00
#define GPIO_VAL_DIR 0x04
#define GPIO_IRQ_ENABLE 0x00
#define GPIO_IRQ_TYPE0 0x04
@ -143,6 +152,40 @@ static const struct aspeed_gpio_bank aspeed_gpio_banks[] = {
#define GPIO_DEBOUNCE_SEL1 0x00
#define GPIO_DEBOUNCE_SEL2 0x04
/* This will be resolved at compile time */
static inline void __iomem *bank_reg(struct aspeed_gpio *gpio,
const struct aspeed_gpio_bank *bank,
const enum aspeed_gpio_reg reg)
{
switch (reg) {
case reg_val:
return gpio->base + bank->val_regs + GPIO_VAL_VALUE;
case reg_dir:
return gpio->base + bank->val_regs + GPIO_VAL_DIR;
case reg_irq_enable:
return gpio->base + bank->irq_regs + GPIO_IRQ_ENABLE;
case reg_irq_type0:
return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE0;
case reg_irq_type1:
return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE1;
case reg_irq_type2:
return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE2;
case reg_irq_status:
return gpio->base + bank->irq_regs + GPIO_IRQ_STATUS;
case reg_debounce_sel1:
return gpio->base + bank->debounce_regs + GPIO_DEBOUNCE_SEL1;
case reg_debounce_sel2:
return gpio->base + bank->debounce_regs + GPIO_DEBOUNCE_SEL2;
case reg_tolerance:
return gpio->base + bank->tolerance_regs;
}
BUG_ON(1);
}
#define GPIO_BANK(x) ((x) >> 5)
#define GPIO_OFFSET(x) ((x) & 0x1f)
#define GPIO_BIT(x) BIT(GPIO_OFFSET(x))
#define _GPIO_SET_DEBOUNCE(t, o, i) ((!!((t) & BIT(i))) << GPIO_OFFSET(o))
#define GPIO_SET_DEBOUNCE1(t, o) _GPIO_SET_DEBOUNCE(t, o, 1)
#define GPIO_SET_DEBOUNCE2(t, o) _GPIO_SET_DEBOUNCE(t, o, 0)
@ -201,27 +244,12 @@ static inline bool have_output(struct aspeed_gpio *gpio, unsigned int offset)
return !props || (props->output & GPIO_BIT(offset));
}
static void __iomem *bank_val_reg(struct aspeed_gpio *gpio,
const struct aspeed_gpio_bank *bank,
unsigned int reg)
{
return gpio->base + bank->val_regs + reg;
}
static void __iomem *bank_irq_reg(struct aspeed_gpio *gpio,
const struct aspeed_gpio_bank *bank,
unsigned int reg)
{
return gpio->base + bank->irq_regs + reg;
}
static int aspeed_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct aspeed_gpio *gpio = gpiochip_get_data(gc);
const struct aspeed_gpio_bank *bank = to_bank(offset);
return !!(ioread32(bank_val_reg(gpio, bank, GPIO_DATA))
& GPIO_BIT(offset));
return !!(ioread32(bank_reg(gpio, bank, reg_val)) & GPIO_BIT(offset));
}
static void __aspeed_gpio_set(struct gpio_chip *gc, unsigned int offset,
@ -232,7 +260,7 @@ static void __aspeed_gpio_set(struct gpio_chip *gc, unsigned int offset,
void __iomem *addr;
u32 reg;
addr = bank_val_reg(gpio, bank, GPIO_DATA);
addr = bank_reg(gpio, bank, reg_val);
reg = gpio->dcache[GPIO_BANK(offset)];
if (val)
@ -269,8 +297,8 @@ static int aspeed_gpio_dir_in(struct gpio_chip *gc, unsigned int offset)
spin_lock_irqsave(&gpio->lock, flags);
reg = ioread32(bank_val_reg(gpio, bank, GPIO_DIR));
iowrite32(reg & ~GPIO_BIT(offset), bank_val_reg(gpio, bank, GPIO_DIR));
reg = ioread32(bank_reg(gpio, bank, reg_dir));
iowrite32(reg & ~GPIO_BIT(offset), bank_reg(gpio, bank, reg_dir));
spin_unlock_irqrestore(&gpio->lock, flags);
@ -291,8 +319,8 @@ static int aspeed_gpio_dir_out(struct gpio_chip *gc,
spin_lock_irqsave(&gpio->lock, flags);
__aspeed_gpio_set(gc, offset, val);
reg = ioread32(bank_val_reg(gpio, bank, GPIO_DIR));
iowrite32(reg | GPIO_BIT(offset), bank_val_reg(gpio, bank, GPIO_DIR));
reg = ioread32(bank_reg(gpio, bank, reg_dir));
iowrite32(reg | GPIO_BIT(offset), bank_reg(gpio, bank, reg_dir));
spin_unlock_irqrestore(&gpio->lock, flags);
@ -314,7 +342,7 @@ static int aspeed_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
spin_lock_irqsave(&gpio->lock, flags);
val = ioread32(bank_val_reg(gpio, bank, GPIO_DIR)) & GPIO_BIT(offset);
val = ioread32(bank_reg(gpio, bank, reg_dir)) & GPIO_BIT(offset);
spin_unlock_irqrestore(&gpio->lock, flags);
@ -358,7 +386,7 @@ static void aspeed_gpio_irq_ack(struct irq_data *d)
if (rc)
return;
status_addr = bank_irq_reg(gpio, bank, GPIO_IRQ_STATUS);
status_addr = bank_reg(gpio, bank, reg_irq_status);
spin_lock_irqsave(&gpio->lock, flags);
iowrite32(bit, status_addr);
@ -378,7 +406,7 @@ static void aspeed_gpio_irq_set_mask(struct irq_data *d, bool set)
if (rc)
return;
addr = bank_irq_reg(gpio, bank, GPIO_IRQ_ENABLE);
addr = bank_reg(gpio, bank, reg_irq_enable);
spin_lock_irqsave(&gpio->lock, flags);
@ -442,17 +470,17 @@ static int aspeed_gpio_set_type(struct irq_data *d, unsigned int type)
spin_lock_irqsave(&gpio->lock, flags);
addr = bank_irq_reg(gpio, bank, GPIO_IRQ_TYPE0);
addr = bank_reg(gpio, bank, reg_irq_type0);
reg = ioread32(addr);
reg = (reg & ~bit) | type0;
iowrite32(reg, addr);
addr = bank_irq_reg(gpio, bank, GPIO_IRQ_TYPE1);
addr = bank_reg(gpio, bank, reg_irq_type1);
reg = ioread32(addr);
reg = (reg & ~bit) | type1;
iowrite32(reg, addr);
addr = bank_irq_reg(gpio, bank, GPIO_IRQ_TYPE2);
addr = bank_reg(gpio, bank, reg_irq_type2);
reg = ioread32(addr);
reg = (reg & ~bit) | type2;
iowrite32(reg, addr);
@ -477,7 +505,7 @@ static void aspeed_gpio_irq_handler(struct irq_desc *desc)
for (i = 0; i < ARRAY_SIZE(aspeed_gpio_banks); i++) {
const struct aspeed_gpio_bank *bank = &aspeed_gpio_banks[i];
reg = ioread32(bank_irq_reg(data, bank, GPIO_IRQ_STATUS));
reg = ioread32(bank_reg(data, bank, reg_irq_status));
for_each_set_bit(p, &reg, 32) {
girq = irq_find_mapping(gc->irq.domain, i * 32 + p);
@ -549,21 +577,21 @@ static int aspeed_gpio_reset_tolerance(struct gpio_chip *chip,
unsigned int offset, bool enable)
{
struct aspeed_gpio *gpio = gpiochip_get_data(chip);
const struct aspeed_gpio_bank *bank;
unsigned long flags;
void __iomem *treg;
u32 val;
bank = to_bank(offset);
treg = bank_reg(gpio, to_bank(offset), reg_tolerance);
spin_lock_irqsave(&gpio->lock, flags);
val = readl(gpio->base + bank->tolerance_regs);
val = readl(treg);
if (enable)
val |= GPIO_BIT(offset);
else
val &= ~GPIO_BIT(offset);
writel(val, gpio->base + bank->tolerance_regs);
writel(val, treg);
spin_unlock_irqrestore(&gpio->lock, flags);
return 0;
@ -582,13 +610,6 @@ static void aspeed_gpio_free(struct gpio_chip *chip, unsigned int offset)
pinctrl_gpio_free(chip->base + offset);
}
static inline void __iomem *bank_debounce_reg(struct aspeed_gpio *gpio,
const struct aspeed_gpio_bank *bank,
unsigned int reg)
{
return gpio->base + bank->debounce_regs + reg;
}
static int usecs_to_cycles(struct aspeed_gpio *gpio, unsigned long usecs,
u32 *cycles)
{
@ -666,11 +687,11 @@ static void configure_timer(struct aspeed_gpio *gpio, unsigned int offset,
void __iomem *addr;
u32 val;
addr = bank_debounce_reg(gpio, bank, GPIO_DEBOUNCE_SEL1);
addr = bank_reg(gpio, bank, reg_debounce_sel1);
val = ioread32(addr);
iowrite32((val & ~mask) | GPIO_SET_DEBOUNCE1(timer, offset), addr);
addr = bank_debounce_reg(gpio, bank, GPIO_DEBOUNCE_SEL2);
addr = bank_reg(gpio, bank, reg_debounce_sel2);
val = ioread32(addr);
iowrite32((val & ~mask) | GPIO_SET_DEBOUNCE2(timer, offset), addr);
}
@ -904,9 +925,8 @@ static int __init aspeed_gpio_probe(struct platform_device *pdev)
/* Populate it with initial values read from the HW */
for (i = 0; i < banks; i++) {
const struct aspeed_gpio_bank *bank = &aspeed_gpio_banks[i];
gpio->dcache[i] = ioread32(gpio->base + bank->val_regs +
GPIO_DATA);
void __iomem *addr = bank_reg(gpio, &aspeed_gpio_banks[i], reg_val);
gpio->dcache[i] = ioread32(addr);
}
rc = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);