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c5dcf76805
Convert the driver to immutable irq-chip with a bit of intuition. Cc: Marc Zyngier <maz@kernel.org> Acked-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
640 lines
15 KiB
C
640 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2019 American Megatrends International LLC.
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*
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* Author: Karthikeyan Mani <karthikeyanm@amiindia.co.in>
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*/
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#include <linux/bitfield.h>
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#include <linux/clk.h>
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#include <linux/gpio/driver.h>
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#include <linux/hashtable.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/seq_file.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#define ASPEED_SGPIO_CTRL 0x54
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#define ASPEED_SGPIO_CLK_DIV_MASK GENMASK(31, 16)
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#define ASPEED_SGPIO_ENABLE BIT(0)
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#define ASPEED_SGPIO_PINS_SHIFT 6
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struct aspeed_sgpio_pdata {
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const u32 pin_mask;
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};
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struct aspeed_sgpio {
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struct gpio_chip chip;
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struct device *dev;
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struct clk *pclk;
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raw_spinlock_t lock;
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void __iomem *base;
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int irq;
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};
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struct aspeed_sgpio_bank {
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u16 val_regs;
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u16 rdata_reg;
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u16 irq_regs;
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u16 tolerance_regs;
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const char names[4][3];
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};
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/*
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* Note: The "value" register returns the input value when the GPIO is
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* configured as an input.
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*
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* The "rdata" register returns the output value when the GPIO is
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* configured as an output.
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*/
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static const struct aspeed_sgpio_bank aspeed_sgpio_banks[] = {
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{
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.val_regs = 0x0000,
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.rdata_reg = 0x0070,
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.irq_regs = 0x0004,
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.tolerance_regs = 0x0018,
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.names = { "A", "B", "C", "D" },
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},
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{
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.val_regs = 0x001C,
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.rdata_reg = 0x0074,
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.irq_regs = 0x0020,
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.tolerance_regs = 0x0034,
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.names = { "E", "F", "G", "H" },
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},
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{
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.val_regs = 0x0038,
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.rdata_reg = 0x0078,
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.irq_regs = 0x003C,
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.tolerance_regs = 0x0050,
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.names = { "I", "J", "K", "L" },
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},
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{
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.val_regs = 0x0090,
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.rdata_reg = 0x007C,
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.irq_regs = 0x0094,
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.tolerance_regs = 0x00A8,
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.names = { "M", "N", "O", "P" },
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},
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};
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enum aspeed_sgpio_reg {
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reg_val,
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reg_rdata,
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reg_irq_enable,
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reg_irq_type0,
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reg_irq_type1,
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reg_irq_type2,
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reg_irq_status,
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reg_tolerance,
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};
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#define GPIO_VAL_VALUE 0x00
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#define GPIO_IRQ_ENABLE 0x00
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#define GPIO_IRQ_TYPE0 0x04
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#define GPIO_IRQ_TYPE1 0x08
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#define GPIO_IRQ_TYPE2 0x0C
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#define GPIO_IRQ_STATUS 0x10
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static void __iomem *bank_reg(struct aspeed_sgpio *gpio,
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const struct aspeed_sgpio_bank *bank,
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const enum aspeed_sgpio_reg reg)
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{
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switch (reg) {
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case reg_val:
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return gpio->base + bank->val_regs + GPIO_VAL_VALUE;
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case reg_rdata:
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return gpio->base + bank->rdata_reg;
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case reg_irq_enable:
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return gpio->base + bank->irq_regs + GPIO_IRQ_ENABLE;
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case reg_irq_type0:
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return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE0;
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case reg_irq_type1:
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return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE1;
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case reg_irq_type2:
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return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE2;
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case reg_irq_status:
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return gpio->base + bank->irq_regs + GPIO_IRQ_STATUS;
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case reg_tolerance:
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return gpio->base + bank->tolerance_regs;
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default:
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/* acturally if code runs to here, it's an error case */
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BUG();
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}
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}
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#define GPIO_BANK(x) ((x) >> 6)
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#define GPIO_OFFSET(x) ((x) & GENMASK(5, 0))
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#define GPIO_BIT(x) BIT(GPIO_OFFSET(x) >> 1)
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static const struct aspeed_sgpio_bank *to_bank(unsigned int offset)
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{
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unsigned int bank;
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bank = GPIO_BANK(offset);
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WARN_ON(bank >= ARRAY_SIZE(aspeed_sgpio_banks));
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return &aspeed_sgpio_banks[bank];
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}
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static int aspeed_sgpio_init_valid_mask(struct gpio_chip *gc,
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unsigned long *valid_mask, unsigned int ngpios)
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{
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bitmap_set(valid_mask, 0, ngpios);
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return 0;
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}
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static void aspeed_sgpio_irq_init_valid_mask(struct gpio_chip *gc,
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unsigned long *valid_mask, unsigned int ngpios)
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{
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unsigned int i;
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/* input GPIOs are even bits */
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for (i = 0; i < ngpios; i++) {
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if (i % 2)
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clear_bit(i, valid_mask);
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}
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}
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static bool aspeed_sgpio_is_input(unsigned int offset)
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{
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return !(offset % 2);
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}
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static int aspeed_sgpio_get(struct gpio_chip *gc, unsigned int offset)
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{
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struct aspeed_sgpio *gpio = gpiochip_get_data(gc);
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const struct aspeed_sgpio_bank *bank = to_bank(offset);
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unsigned long flags;
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enum aspeed_sgpio_reg reg;
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int rc = 0;
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raw_spin_lock_irqsave(&gpio->lock, flags);
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reg = aspeed_sgpio_is_input(offset) ? reg_val : reg_rdata;
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rc = !!(ioread32(bank_reg(gpio, bank, reg)) & GPIO_BIT(offset));
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raw_spin_unlock_irqrestore(&gpio->lock, flags);
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return rc;
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}
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static int sgpio_set_value(struct gpio_chip *gc, unsigned int offset, int val)
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{
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struct aspeed_sgpio *gpio = gpiochip_get_data(gc);
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const struct aspeed_sgpio_bank *bank = to_bank(offset);
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void __iomem *addr_r, *addr_w;
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u32 reg = 0;
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if (aspeed_sgpio_is_input(offset))
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return -EINVAL;
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/* Since this is an output, read the cached value from rdata, then
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* update val. */
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addr_r = bank_reg(gpio, bank, reg_rdata);
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addr_w = bank_reg(gpio, bank, reg_val);
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reg = ioread32(addr_r);
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if (val)
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reg |= GPIO_BIT(offset);
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else
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reg &= ~GPIO_BIT(offset);
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iowrite32(reg, addr_w);
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return 0;
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}
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static void aspeed_sgpio_set(struct gpio_chip *gc, unsigned int offset, int val)
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{
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struct aspeed_sgpio *gpio = gpiochip_get_data(gc);
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unsigned long flags;
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raw_spin_lock_irqsave(&gpio->lock, flags);
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sgpio_set_value(gc, offset, val);
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raw_spin_unlock_irqrestore(&gpio->lock, flags);
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}
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static int aspeed_sgpio_dir_in(struct gpio_chip *gc, unsigned int offset)
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{
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return aspeed_sgpio_is_input(offset) ? 0 : -EINVAL;
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}
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static int aspeed_sgpio_dir_out(struct gpio_chip *gc, unsigned int offset, int val)
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{
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struct aspeed_sgpio *gpio = gpiochip_get_data(gc);
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unsigned long flags;
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int rc;
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/* No special action is required for setting the direction; we'll
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* error-out in sgpio_set_value if this isn't an output GPIO */
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raw_spin_lock_irqsave(&gpio->lock, flags);
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rc = sgpio_set_value(gc, offset, val);
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raw_spin_unlock_irqrestore(&gpio->lock, flags);
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return rc;
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}
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static int aspeed_sgpio_get_direction(struct gpio_chip *gc, unsigned int offset)
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{
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return !!aspeed_sgpio_is_input(offset);
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}
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static void irqd_to_aspeed_sgpio_data(struct irq_data *d,
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struct aspeed_sgpio **gpio,
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const struct aspeed_sgpio_bank **bank,
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u32 *bit, int *offset)
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{
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struct aspeed_sgpio *internal;
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*offset = irqd_to_hwirq(d);
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internal = irq_data_get_irq_chip_data(d);
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WARN_ON(!internal);
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*gpio = internal;
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*bank = to_bank(*offset);
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*bit = GPIO_BIT(*offset);
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}
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static void aspeed_sgpio_irq_ack(struct irq_data *d)
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{
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const struct aspeed_sgpio_bank *bank;
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struct aspeed_sgpio *gpio;
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unsigned long flags;
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void __iomem *status_addr;
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int offset;
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u32 bit;
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irqd_to_aspeed_sgpio_data(d, &gpio, &bank, &bit, &offset);
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status_addr = bank_reg(gpio, bank, reg_irq_status);
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raw_spin_lock_irqsave(&gpio->lock, flags);
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iowrite32(bit, status_addr);
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raw_spin_unlock_irqrestore(&gpio->lock, flags);
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}
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static void aspeed_sgpio_irq_set_mask(struct irq_data *d, bool set)
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{
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const struct aspeed_sgpio_bank *bank;
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struct aspeed_sgpio *gpio;
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unsigned long flags;
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u32 reg, bit;
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void __iomem *addr;
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int offset;
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irqd_to_aspeed_sgpio_data(d, &gpio, &bank, &bit, &offset);
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addr = bank_reg(gpio, bank, reg_irq_enable);
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/* Unmasking the IRQ */
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if (set)
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gpiochip_enable_irq(&gpio->chip, irqd_to_hwirq(d));
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raw_spin_lock_irqsave(&gpio->lock, flags);
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reg = ioread32(addr);
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if (set)
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reg |= bit;
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else
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reg &= ~bit;
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iowrite32(reg, addr);
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raw_spin_unlock_irqrestore(&gpio->lock, flags);
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/* Masking the IRQ */
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if (!set)
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gpiochip_disable_irq(&gpio->chip, irqd_to_hwirq(d));
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}
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static void aspeed_sgpio_irq_mask(struct irq_data *d)
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{
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aspeed_sgpio_irq_set_mask(d, false);
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}
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static void aspeed_sgpio_irq_unmask(struct irq_data *d)
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{
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aspeed_sgpio_irq_set_mask(d, true);
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}
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static int aspeed_sgpio_set_type(struct irq_data *d, unsigned int type)
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{
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u32 type0 = 0;
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u32 type1 = 0;
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u32 type2 = 0;
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u32 bit, reg;
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const struct aspeed_sgpio_bank *bank;
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irq_flow_handler_t handler;
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struct aspeed_sgpio *gpio;
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unsigned long flags;
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void __iomem *addr;
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int offset;
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irqd_to_aspeed_sgpio_data(d, &gpio, &bank, &bit, &offset);
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switch (type & IRQ_TYPE_SENSE_MASK) {
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case IRQ_TYPE_EDGE_BOTH:
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type2 |= bit;
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fallthrough;
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case IRQ_TYPE_EDGE_RISING:
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type0 |= bit;
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fallthrough;
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case IRQ_TYPE_EDGE_FALLING:
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handler = handle_edge_irq;
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break;
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case IRQ_TYPE_LEVEL_HIGH:
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type0 |= bit;
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fallthrough;
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case IRQ_TYPE_LEVEL_LOW:
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type1 |= bit;
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handler = handle_level_irq;
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break;
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default:
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return -EINVAL;
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}
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raw_spin_lock_irqsave(&gpio->lock, flags);
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addr = bank_reg(gpio, bank, reg_irq_type0);
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reg = ioread32(addr);
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reg = (reg & ~bit) | type0;
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iowrite32(reg, addr);
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addr = bank_reg(gpio, bank, reg_irq_type1);
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reg = ioread32(addr);
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reg = (reg & ~bit) | type1;
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iowrite32(reg, addr);
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addr = bank_reg(gpio, bank, reg_irq_type2);
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reg = ioread32(addr);
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reg = (reg & ~bit) | type2;
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iowrite32(reg, addr);
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raw_spin_unlock_irqrestore(&gpio->lock, flags);
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irq_set_handler_locked(d, handler);
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return 0;
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}
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static void aspeed_sgpio_irq_handler(struct irq_desc *desc)
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{
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struct gpio_chip *gc = irq_desc_get_handler_data(desc);
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struct irq_chip *ic = irq_desc_get_chip(desc);
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struct aspeed_sgpio *data = gpiochip_get_data(gc);
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unsigned int i, p;
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unsigned long reg;
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chained_irq_enter(ic, desc);
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for (i = 0; i < ARRAY_SIZE(aspeed_sgpio_banks); i++) {
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const struct aspeed_sgpio_bank *bank = &aspeed_sgpio_banks[i];
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reg = ioread32(bank_reg(data, bank, reg_irq_status));
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for_each_set_bit(p, ®, 32)
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generic_handle_domain_irq(gc->irq.domain, (i * 32 + p) * 2);
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}
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chained_irq_exit(ic, desc);
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}
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static void aspeed_sgpio_irq_print_chip(struct irq_data *d, struct seq_file *p)
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{
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const struct aspeed_sgpio_bank *bank;
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struct aspeed_sgpio *gpio;
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u32 bit;
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int offset;
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irqd_to_aspeed_sgpio_data(d, &gpio, &bank, &bit, &offset);
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seq_printf(p, dev_name(gpio->dev));
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}
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static const struct irq_chip aspeed_sgpio_irq_chip = {
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.irq_ack = aspeed_sgpio_irq_ack,
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.irq_mask = aspeed_sgpio_irq_mask,
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.irq_unmask = aspeed_sgpio_irq_unmask,
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.irq_set_type = aspeed_sgpio_set_type,
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.irq_print_chip = aspeed_sgpio_irq_print_chip,
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.flags = IRQCHIP_IMMUTABLE,
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GPIOCHIP_IRQ_RESOURCE_HELPERS,
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};
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static int aspeed_sgpio_setup_irqs(struct aspeed_sgpio *gpio,
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struct platform_device *pdev)
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{
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int rc, i;
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const struct aspeed_sgpio_bank *bank;
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struct gpio_irq_chip *irq;
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rc = platform_get_irq(pdev, 0);
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if (rc < 0)
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return rc;
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gpio->irq = rc;
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/* Disable IRQ and clear Interrupt status registers for all SGPIO Pins. */
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for (i = 0; i < ARRAY_SIZE(aspeed_sgpio_banks); i++) {
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bank = &aspeed_sgpio_banks[i];
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/* disable irq enable bits */
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iowrite32(0x00000000, bank_reg(gpio, bank, reg_irq_enable));
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/* clear status bits */
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iowrite32(0xffffffff, bank_reg(gpio, bank, reg_irq_status));
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}
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irq = &gpio->chip.irq;
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gpio_irq_chip_set_chip(irq, &aspeed_sgpio_irq_chip);
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irq->init_valid_mask = aspeed_sgpio_irq_init_valid_mask;
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irq->handler = handle_bad_irq;
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irq->default_type = IRQ_TYPE_NONE;
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irq->parent_handler = aspeed_sgpio_irq_handler;
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irq->parent_handler_data = gpio;
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irq->parents = &gpio->irq;
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irq->num_parents = 1;
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/* Apply default IRQ settings */
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for (i = 0; i < ARRAY_SIZE(aspeed_sgpio_banks); i++) {
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bank = &aspeed_sgpio_banks[i];
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/* set falling or level-low irq */
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iowrite32(0x00000000, bank_reg(gpio, bank, reg_irq_type0));
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/* trigger type is edge */
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iowrite32(0x00000000, bank_reg(gpio, bank, reg_irq_type1));
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/* single edge trigger */
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iowrite32(0x00000000, bank_reg(gpio, bank, reg_irq_type2));
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}
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return 0;
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}
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static const struct aspeed_sgpio_pdata ast2400_sgpio_pdata = {
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.pin_mask = GENMASK(9, 6),
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};
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static int aspeed_sgpio_reset_tolerance(struct gpio_chip *chip,
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unsigned int offset, bool enable)
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{
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struct aspeed_sgpio *gpio = gpiochip_get_data(chip);
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unsigned long flags;
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void __iomem *reg;
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u32 val;
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reg = bank_reg(gpio, to_bank(offset), reg_tolerance);
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raw_spin_lock_irqsave(&gpio->lock, flags);
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|
|
val = readl(reg);
|
|
|
|
if (enable)
|
|
val |= GPIO_BIT(offset);
|
|
else
|
|
val &= ~GPIO_BIT(offset);
|
|
|
|
writel(val, reg);
|
|
|
|
raw_spin_unlock_irqrestore(&gpio->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int aspeed_sgpio_set_config(struct gpio_chip *chip, unsigned int offset,
|
|
unsigned long config)
|
|
{
|
|
unsigned long param = pinconf_to_config_param(config);
|
|
u32 arg = pinconf_to_config_argument(config);
|
|
|
|
if (param == PIN_CONFIG_PERSIST_STATE)
|
|
return aspeed_sgpio_reset_tolerance(chip, offset, arg);
|
|
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static const struct aspeed_sgpio_pdata ast2600_sgpiom_pdata = {
|
|
.pin_mask = GENMASK(10, 6),
|
|
};
|
|
|
|
static const struct of_device_id aspeed_sgpio_of_table[] = {
|
|
{ .compatible = "aspeed,ast2400-sgpio", .data = &ast2400_sgpio_pdata, },
|
|
{ .compatible = "aspeed,ast2500-sgpio", .data = &ast2400_sgpio_pdata, },
|
|
{ .compatible = "aspeed,ast2600-sgpiom", .data = &ast2600_sgpiom_pdata, },
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, aspeed_sgpio_of_table);
|
|
|
|
static int __init aspeed_sgpio_probe(struct platform_device *pdev)
|
|
{
|
|
u32 nr_gpios, sgpio_freq, sgpio_clk_div, gpio_cnt_regval, pin_mask;
|
|
const struct aspeed_sgpio_pdata *pdata;
|
|
struct aspeed_sgpio *gpio;
|
|
unsigned long apb_freq;
|
|
int rc;
|
|
|
|
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
|
|
if (!gpio)
|
|
return -ENOMEM;
|
|
|
|
gpio->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(gpio->base))
|
|
return PTR_ERR(gpio->base);
|
|
|
|
gpio->dev = &pdev->dev;
|
|
|
|
pdata = device_get_match_data(&pdev->dev);
|
|
if (!pdata)
|
|
return -EINVAL;
|
|
|
|
pin_mask = pdata->pin_mask;
|
|
|
|
rc = device_property_read_u32(&pdev->dev, "ngpios", &nr_gpios);
|
|
if (rc < 0) {
|
|
dev_err(&pdev->dev, "Could not read ngpios property\n");
|
|
return -EINVAL;
|
|
} else if (nr_gpios % 8) {
|
|
dev_err(&pdev->dev, "Number of GPIOs not multiple of 8: %d\n",
|
|
nr_gpios);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = device_property_read_u32(&pdev->dev, "bus-frequency", &sgpio_freq);
|
|
if (rc < 0) {
|
|
dev_err(&pdev->dev, "Could not read bus-frequency property\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
gpio->pclk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(gpio->pclk)) {
|
|
dev_err(&pdev->dev, "devm_clk_get failed\n");
|
|
return PTR_ERR(gpio->pclk);
|
|
}
|
|
|
|
apb_freq = clk_get_rate(gpio->pclk);
|
|
|
|
/*
|
|
* From the datasheet,
|
|
* SGPIO period = 1/PCLK * 2 * (GPIO254[31:16] + 1)
|
|
* period = 2 * (GPIO254[31:16] + 1) / PCLK
|
|
* frequency = 1 / (2 * (GPIO254[31:16] + 1) / PCLK)
|
|
* frequency = PCLK / (2 * (GPIO254[31:16] + 1))
|
|
* frequency * 2 * (GPIO254[31:16] + 1) = PCLK
|
|
* GPIO254[31:16] = PCLK / (frequency * 2) - 1
|
|
*/
|
|
if (sgpio_freq == 0)
|
|
return -EINVAL;
|
|
|
|
sgpio_clk_div = (apb_freq / (sgpio_freq * 2)) - 1;
|
|
|
|
if (sgpio_clk_div > (1 << 16) - 1)
|
|
return -EINVAL;
|
|
|
|
gpio_cnt_regval = ((nr_gpios / 8) << ASPEED_SGPIO_PINS_SHIFT) & pin_mask;
|
|
iowrite32(FIELD_PREP(ASPEED_SGPIO_CLK_DIV_MASK, sgpio_clk_div) | gpio_cnt_regval |
|
|
ASPEED_SGPIO_ENABLE, gpio->base + ASPEED_SGPIO_CTRL);
|
|
|
|
raw_spin_lock_init(&gpio->lock);
|
|
|
|
gpio->chip.parent = &pdev->dev;
|
|
gpio->chip.ngpio = nr_gpios * 2;
|
|
gpio->chip.init_valid_mask = aspeed_sgpio_init_valid_mask;
|
|
gpio->chip.direction_input = aspeed_sgpio_dir_in;
|
|
gpio->chip.direction_output = aspeed_sgpio_dir_out;
|
|
gpio->chip.get_direction = aspeed_sgpio_get_direction;
|
|
gpio->chip.request = NULL;
|
|
gpio->chip.free = NULL;
|
|
gpio->chip.get = aspeed_sgpio_get;
|
|
gpio->chip.set = aspeed_sgpio_set;
|
|
gpio->chip.set_config = aspeed_sgpio_set_config;
|
|
gpio->chip.label = dev_name(&pdev->dev);
|
|
gpio->chip.base = -1;
|
|
|
|
aspeed_sgpio_setup_irqs(gpio, pdev);
|
|
|
|
rc = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver aspeed_sgpio_driver = {
|
|
.driver = {
|
|
.name = KBUILD_MODNAME,
|
|
.of_match_table = aspeed_sgpio_of_table,
|
|
},
|
|
};
|
|
|
|
module_platform_driver_probe(aspeed_sgpio_driver, aspeed_sgpio_probe);
|
|
MODULE_DESCRIPTION("Aspeed Serial GPIO Driver");
|