ARM: S5PC1xx: add gpiolib and external/gpio interrupt support

Add support for gpiolib calls. This is based on the gpiolib implementation
from plat-s3c64xx tree.
Add support for external interrupts for GPIO H banks.
Add support for GPIO interrupts for all banks.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 503 insertions, 0 deletions

diff --git a/arch/arm/plat-s5pc1xx/gpiolib.c b/arch/arm/plat-s5pc1xx/gpiolib.c
new file mode 100644
index 000000000000..facb410e7a71
--- /dev/null
+++ b/arch/arm/plat-s5pc1xx/gpiolib.c
@@ -0,0 +1,503 @@
+/*
+ * arch/arm/plat-s5pc1xx/gpiolib.c
+ *
+ *  Copyright 2009 Samsung Electronics Co
+ *  Kyungmin Park <kyungmin.park@samsung.com>
+ *
+ * S5PC1XX - GPIOlib support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#include <mach/map.h>
+#include <mach/gpio-core.h>
+
+#include <plat/gpio-cfg.h>
+#include <plat/gpio-cfg-helpers.h>
+#include <plat/regs-gpio.h>
+
+/* S5PC100 GPIO bank summary:
+ *
+ * Bank	GPIOs	Style	INT Type
+ * A0	8	4Bit	GPIO_INT0
+ * A1	5	4Bit	GPIO_INT1
+ * B	8	4Bit	GPIO_INT2
+ * C	5	4Bit	GPIO_INT3
+ * D	7	4Bit	GPIO_INT4
+ * E0	8	4Bit	GPIO_INT5
+ * E1	6	4Bit	GPIO_INT6
+ * F0	8	4Bit	GPIO_INT7
+ * F1	8	4Bit	GPIO_INT8
+ * F2	8	4Bit	GPIO_INT9
+ * F3	4	4Bit	GPIO_INT10
+ * G0	8	4Bit	GPIO_INT11
+ * G1	3	4Bit	GPIO_INT12
+ * G2	7	4Bit	GPIO_INT13
+ * G3	7	4Bit	GPIO_INT14
+ * H0	8	4Bit	WKUP_INT
+ * H1	8	4Bit	WKUP_INT
+ * H2	8	4Bit	WKUP_INT
+ * H3	8	4Bit	WKUP_INT
+ * I	8	4Bit	GPIO_INT15
+ * J0	8	4Bit	GPIO_INT16
+ * J1	5	4Bit	GPIO_INT17
+ * J2	8	4Bit	GPIO_INT18
+ * J3	8	4Bit	GPIO_INT19
+ * J4	4	4Bit	GPIO_INT20
+ * K0	8	4Bit	None
+ * K1	6	4Bit	None
+ * K2	8	4Bit	None
+ * K3	8	4Bit	None
+ * L0	8	4Bit	None
+ * L1	8	4Bit	None
+ * L2	8	4Bit	None
+ * L3	8	4Bit	None
+ */
+
+#define OFF_GPCON	(0x00)
+#define OFF_GPDAT	(0x04)
+
+#define con_4bit_shift(__off) ((__off) * 4)
+
+#if 1
+#define gpio_dbg(x...) do { } while (0)
+#else
+#define gpio_dbg(x...) printk(KERN_DEBUG x)
+#endif
+
+/* The s5pc1xx_gpiolib routines are to control the gpio banks where
+ * the gpio configuration register (GPxCON) has 4 bits per GPIO, as the
+ * following example:
+ *
+ * base + 0x00: Control register, 4 bits per gpio
+ *	        gpio n: 4 bits starting at (4*n)
+ *		0000 = input, 0001 = output, others mean special-function
+ * base + 0x04: Data register, 1 bit per gpio
+ *		bit n: data bit n
+ *
+ * Note, since the data register is one bit per gpio and is at base + 0x4
+ * we can use s3c_gpiolib_get and s3c_gpiolib_set to change the state of
+ * the output.
+ */
+
+static int s5pc1xx_gpiolib_input(struct gpio_chip *chip, unsigned offset)
+{
+	struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
+	void __iomem *base = ourchip->base;
+	unsigned long con;
+
+	con = __raw_readl(base + OFF_GPCON);
+	con &= ~(0xf << con_4bit_shift(offset));
+	__raw_writel(con, base + OFF_GPCON);
+
+	gpio_dbg("%s: %p: CON now %08lx\n", __func__, base, con);
+
+	return 0;
+}
+
+static int s5pc1xx_gpiolib_output(struct gpio_chip *chip,
+				       unsigned offset, int value)
+{
+	struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
+	void __iomem *base = ourchip->base;
+	unsigned long con;
+	unsigned long dat;
+
+	con = __raw_readl(base + OFF_GPCON);
+	con &= ~(0xf << con_4bit_shift(offset));
+	con |= 0x1 << con_4bit_shift(offset);
+
+	dat = __raw_readl(base + OFF_GPDAT);
+	if (value)
+		dat |= 1 << offset;
+	else
+		dat &= ~(1 << offset);
+
+	__raw_writel(dat, base + OFF_GPDAT);
+	__raw_writel(con, base + OFF_GPCON);
+	__raw_writel(dat, base + OFF_GPDAT);
+
+	gpio_dbg("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
+
+	return 0;
+}
+
+static int s5pc1xx_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset)
+{
+	return S3C_IRQ_GPIO(chip->base + offset);
+}
+
+static int s5pc1xx_gpiolib_to_eint(struct gpio_chip *chip, unsigned int offset)
+{
+	int base;
+
+	base = chip->base - S5PC100_GPH0(0);
+	if (base == 0)
+		return IRQ_EINT(offset);
+	base = chip->base - S5PC100_GPH1(0);
+	if (base == 0)
+		return IRQ_EINT(8 + offset);
+	base = chip->base - S5PC100_GPH2(0);
+	if (base == 0)
+		return IRQ_EINT(16 + offset);
+	base = chip->base - S5PC100_GPH3(0);
+	if (base == 0)
+		return IRQ_EINT(24 + offset);
+	return -EINVAL;
+}
+
+static struct s3c_gpio_cfg gpio_cfg = {
+	.set_config	= s3c_gpio_setcfg_s3c64xx_4bit,
+	.set_pull	= s3c_gpio_setpull_updown,
+	.get_pull	= s3c_gpio_getpull_updown,
+};
+
+static struct s3c_gpio_cfg gpio_cfg_eint = {
+	.cfg_eint	= 0xf,
+	.set_config	= s3c_gpio_setcfg_s3c64xx_4bit,
+	.set_pull	= s3c_gpio_setpull_updown,
+	.get_pull	= s3c_gpio_getpull_updown,
+};
+
+static struct s3c_gpio_cfg gpio_cfg_noint = {
+	.set_config	= s3c_gpio_setcfg_s3c64xx_4bit,
+	.set_pull	= s3c_gpio_setpull_updown,
+	.get_pull	= s3c_gpio_getpull_updown,
+};
+
+static struct s3c_gpio_chip s5pc100_gpio_chips[] = {
+	{
+		.base	= S5PC100_GPA0_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPA0(0),
+			.ngpio	= S5PC100_GPIO_A0_NR,
+			.label	= "GPA0",
+		},
+	}, {
+		.base	= S5PC100_GPA1_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPA1(0),
+			.ngpio	= S5PC100_GPIO_A1_NR,
+			.label	= "GPA1",
+		},
+	}, {
+		.base	= S5PC100_GPB_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPB(0),
+			.ngpio	= S5PC100_GPIO_B_NR,
+			.label	= "GPB",
+		},
+	}, {
+		.base	= S5PC100_GPC_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPC(0),
+			.ngpio	= S5PC100_GPIO_C_NR,
+			.label	= "GPC",
+		},
+	}, {
+		.base	= S5PC100_GPD_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPD(0),
+			.ngpio	= S5PC100_GPIO_D_NR,
+			.label	= "GPD",
+		},
+	}, {
+		.base	= S5PC100_GPE0_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPE0(0),
+			.ngpio	= S5PC100_GPIO_E0_NR,
+			.label	= "GPE0",
+		},
+	}, {
+		.base	= S5PC100_GPE1_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPE1(0),
+			.ngpio	= S5PC100_GPIO_E1_NR,
+			.label	= "GPE1",
+		},
+	}, {
+		.base	= S5PC100_GPF0_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPF0(0),
+			.ngpio	= S5PC100_GPIO_F0_NR,
+			.label	= "GPF0",
+		},
+	}, {
+		.base	= S5PC100_GPF1_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPF1(0),
+			.ngpio	= S5PC100_GPIO_F1_NR,
+			.label	= "GPF1",
+		},
+	}, {
+		.base	= S5PC100_GPF2_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPF2(0),
+			.ngpio	= S5PC100_GPIO_F2_NR,
+			.label	= "GPF2",
+		},
+	}, {
+		.base	= S5PC100_GPF3_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPF3(0),
+			.ngpio	= S5PC100_GPIO_F3_NR,
+			.label	= "GPF3",
+		},
+	}, {
+		.base	= S5PC100_GPG0_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPG0(0),
+			.ngpio	= S5PC100_GPIO_G0_NR,
+			.label	= "GPG0",
+		},
+	}, {
+		.base	= S5PC100_GPG1_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPG1(0),
+			.ngpio	= S5PC100_GPIO_G1_NR,
+			.label	= "GPG1",
+		},
+	}, {
+		.base	= S5PC100_GPG2_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPG2(0),
+			.ngpio	= S5PC100_GPIO_G2_NR,
+			.label	= "GPG2",
+		},
+	}, {
+		.base	= S5PC100_GPG3_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPG3(0),
+			.ngpio	= S5PC100_GPIO_G3_NR,
+			.label	= "GPG3",
+		},
+	}, {
+		.base	= S5PC100_GPH0_BASE,
+		.config	= &gpio_cfg_eint,
+		.chip	= {
+			.base	= S5PC100_GPH0(0),
+			.ngpio	= S5PC100_GPIO_H0_NR,
+			.label	= "GPH0",
+		},
+	}, {
+		.base	= S5PC100_GPH1_BASE,
+		.config	= &gpio_cfg_eint,
+		.chip	= {
+			.base	= S5PC100_GPH1(0),
+			.ngpio	= S5PC100_GPIO_H1_NR,
+			.label	= "GPH1",
+		},
+	}, {
+		.base	= S5PC100_GPH2_BASE,
+		.config	= &gpio_cfg_eint,
+		.chip	= {
+			.base	= S5PC100_GPH2(0),
+			.ngpio	= S5PC100_GPIO_H2_NR,
+			.label	= "GPH2",
+		},
+	}, {
+		.base	= S5PC100_GPH3_BASE,
+		.config	= &gpio_cfg_eint,
+		.chip	= {
+			.base	= S5PC100_GPH3(0),
+			.ngpio	= S5PC100_GPIO_H3_NR,
+			.label	= "GPH3",
+		},
+	}, {
+		.base	= S5PC100_GPI_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPI(0),
+			.ngpio	= S5PC100_GPIO_I_NR,
+			.label	= "GPI",
+		},
+	}, {
+		.base	= S5PC100_GPJ0_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPJ0(0),
+			.ngpio	= S5PC100_GPIO_J0_NR,
+			.label	= "GPJ0",
+		},
+	}, {
+		.base	= S5PC100_GPJ1_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPJ1(0),
+			.ngpio	= S5PC100_GPIO_J1_NR,
+			.label	= "GPJ1",
+		},
+	}, {
+		.base	= S5PC100_GPJ2_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPJ2(0),
+			.ngpio	= S5PC100_GPIO_J2_NR,
+			.label	= "GPJ2",
+		},
+	}, {
+		.base	= S5PC100_GPJ3_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPJ3(0),
+			.ngpio	= S5PC100_GPIO_J3_NR,
+			.label	= "GPJ3",
+		},
+	}, {
+		.base	= S5PC100_GPJ4_BASE,
+		.config	= &gpio_cfg,
+		.chip	= {
+			.base	= S5PC100_GPJ4(0),
+			.ngpio	= S5PC100_GPIO_J4_NR,
+			.label	= "GPJ4",
+		},
+	}, {
+		.base	= S5PC100_GPK0_BASE,
+		.config	= &gpio_cfg_noint,
+		.chip	= {
+			.base	= S5PC100_GPK0(0),
+			.ngpio	= S5PC100_GPIO_K0_NR,
+			.label	= "GPK0",
+		},
+	}, {
+		.base	= S5PC100_GPK1_BASE,
+		.config	= &gpio_cfg_noint,
+		.chip	= {
+			.base	= S5PC100_GPK1(0),
+			.ngpio	= S5PC100_GPIO_K1_NR,
+			.label	= "GPK1",
+		},
+	}, {
+		.base	= S5PC100_GPK2_BASE,
+		.config	= &gpio_cfg_noint,
+		.chip	= {
+			.base	= S5PC100_GPK2(0),
+			.ngpio	= S5PC100_GPIO_K2_NR,
+			.label	= "GPK2",
+		},
+	}, {
+		.base	= S5PC100_GPK3_BASE,
+		.config	= &gpio_cfg_noint,
+		.chip	= {
+			.base	= S5PC100_GPK3(0),
+			.ngpio	= S5PC100_GPIO_K3_NR,
+			.label	= "GPK3",
+		},
+	}, {
+		.base	= S5PC100_GPL0_BASE,
+		.config	= &gpio_cfg_noint,
+		.chip	= {
+			.base	= S5PC100_GPL0(0),
+			.ngpio	= S5PC100_GPIO_L0_NR,
+			.label	= "GPL0",
+		},
+	}, {
+		.base	= S5PC100_GPL1_BASE,
+		.config	= &gpio_cfg_noint,
+		.chip	= {
+			.base	= S5PC100_GPL1(0),
+			.ngpio	= S5PC100_GPIO_L1_NR,
+			.label	= "GPL1",
+		},
+	}, {
+		.base	= S5PC100_GPL2_BASE,
+		.config	= &gpio_cfg_noint,
+		.chip	= {
+			.base	= S5PC100_GPL2(0),
+			.ngpio	= S5PC100_GPIO_L2_NR,
+			.label	= "GPL2",
+		},
+	}, {
+		.base	= S5PC100_GPL3_BASE,
+		.config	= &gpio_cfg_noint,
+		.chip	= {
+			.base	= S5PC100_GPL3(0),
+			.ngpio	= S5PC100_GPIO_L3_NR,
+			.label	= "GPL3",
+		},
+	}, {
+		.base	= S5PC100_GPL4_BASE,
+		.config	= &gpio_cfg_noint,
+		.chip	= {
+			.base	= S5PC100_GPL4(0),
+			.ngpio	= S5PC100_GPIO_L4_NR,
+			.label	= "GPL4",
+		},
+	},
+};
+
+/* FIXME move from irq-gpio.c */
+extern struct irq_chip s5pc1xx_gpioint;
+extern void s5pc1xx_irq_gpioint_handler(unsigned int irq, struct irq_desc *desc);
+
+static __init void s5pc1xx_gpiolib_link(struct s3c_gpio_chip *chip)
+{
+	chip->chip.direction_input = s5pc1xx_gpiolib_input;
+	chip->chip.direction_output = s5pc1xx_gpiolib_output;
+	chip->pm = __gpio_pm(&s3c_gpio_pm_4bit);
+
+	/* Interrupt */
+	if (chip->config == &gpio_cfg) {
+		int i, irq;
+
+		chip->chip.to_irq = s5pc1xx_gpiolib_to_irq;
+
+		for (i = 0;  i < chip->chip.ngpio; i++) {
+			irq = S3C_IRQ_GPIO_BASE + chip->chip.base + i;
+			set_irq_chip(irq, &s5pc1xx_gpioint);
+			set_irq_data(irq, &chip->chip);
+			set_irq_handler(irq, handle_level_irq);
+			set_irq_flags(irq, IRQF_VALID);
+		}
+	} else if (chip->config == &gpio_cfg_eint)
+		chip->chip.to_irq = s5pc1xx_gpiolib_to_eint;
+}
+
+static __init void s5pc1xx_gpiolib_add(struct s3c_gpio_chip *chips,
+				       int nr_chips,
+				       void (*fn)(struct s3c_gpio_chip *))
+{
+	for (; nr_chips > 0; nr_chips--, chips++) {
+		if (fn)
+			(fn)(chips);
+		s3c_gpiolib_add(chips);
+	}
+}
+
+static __init int s5pc1xx_gpiolib_init(void)
+{
+	struct s3c_gpio_chip *chips;
+	int nr_chips;
+
+		chips = s5pc100_gpio_chips;
+		nr_chips = ARRAY_SIZE(s5pc100_gpio_chips);
+
+	s5pc1xx_gpiolib_add(chips, nr_chips, s5pc1xx_gpiolib_link);
+	/* Interrupt */
+	set_irq_chained_handler(IRQ_GPIOINT, s5pc1xx_irq_gpioint_handler);
+
+	return 0;
+}
+core_initcall(s5pc1xx_gpiolib_init);