ARM: LPC32XX: GPIO, timer, and IRQ drivers

Common drivers for the LPC32XX used on all platforms

Signed-off-by: Kevin Wells <wellsk40@gmail.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

1 files changed, 432 insertions, 0 deletions

diff --git a/arch/arm/mach-lpc32xx/irq.c b/arch/arm/mach-lpc32xx/irq.c
new file mode 100644
index 000000000000..bd0df26c415b
--- /dev/null
+++ b/arch/arm/mach-lpc32xx/irq.c
@@ -0,0 +1,432 @@
+/*
+ * arch/arm/mach-lpc32xx/irq.c
+ *
+ * Author: Kevin Wells <kevin.wells@nxp.com>
+ *
+ * Copyright (C) 2010 NXP Semiconductors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include <mach/irqs.h>
+#include <mach/hardware.h>
+#include <mach/platform.h>
+#include "common.h"
+
+/*
+ * Default value representing the Activation polarity of all internal
+ * interrupt sources
+ */
+#define MIC_APR_DEFAULT         0x3FF0EFE0
+#define SIC1_APR_DEFAULT        0xFBD27186
+#define SIC2_APR_DEFAULT        0x801810C0
+
+/*
+ * Default value representing the Activation Type of all internal
+ * interrupt sources. All are level sensitive.
+ */
+#define MIC_ATR_DEFAULT         0x00000000
+#define SIC1_ATR_DEFAULT        0x00026000
+#define SIC2_ATR_DEFAULT        0x00000000
+
+struct lpc32xx_event_group_regs {
+        void __iomem *enab_reg;
+        void __iomem *edge_reg;
+        void __iomem *maskstat_reg;
+        void __iomem *rawstat_reg;
+};
+
+static const struct lpc32xx_event_group_regs lpc32xx_event_int_regs = {
+        .enab_reg = LPC32XX_CLKPWR_INT_ER,
+        .edge_reg = LPC32XX_CLKPWR_INT_AP,
+        .maskstat_reg = LPC32XX_CLKPWR_INT_SR,
+        .rawstat_reg = LPC32XX_CLKPWR_INT_RS,
+};
+
+static const struct lpc32xx_event_group_regs lpc32xx_event_pin_regs = {
+        .enab_reg = LPC32XX_CLKPWR_PIN_ER,
+        .edge_reg = LPC32XX_CLKPWR_PIN_AP,
+        .maskstat_reg = LPC32XX_CLKPWR_PIN_SR,
+        .rawstat_reg = LPC32XX_CLKPWR_PIN_RS,
+};
+
+struct lpc32xx_event_info {
+        const struct lpc32xx_event_group_regs *event_group;
+        u32 mask;
+};
+
+/*
+ * Maps an IRQ number to and event mask and register
+ */
+static const struct lpc32xx_event_info lpc32xx_events[NR_IRQS] = {
+        [IRQ_LPC32XX_GPI_08] = {
+                .event_group = &lpc32xx_event_pin_regs,
+                .mask = LPC32XX_CLKPWR_EXTSRC_GPI_08_BIT,
+        },
+        [IRQ_LPC32XX_GPI_09] = {
+                .event_group = &lpc32xx_event_pin_regs,
+                .mask = LPC32XX_CLKPWR_EXTSRC_GPI_09_BIT,
+        },
+        [IRQ_LPC32XX_GPI_19] = {
+                .event_group = &lpc32xx_event_pin_regs,
+                .mask = LPC32XX_CLKPWR_EXTSRC_GPI_19_BIT,
+        },
+        [IRQ_LPC32XX_GPI_07] = {
+                .event_group = &lpc32xx_event_pin_regs,
+                .mask = LPC32XX_CLKPWR_EXTSRC_GPI_07_BIT,
+        },
+        [IRQ_LPC32XX_GPI_00] = {
+                .event_group = &lpc32xx_event_pin_regs,
+                .mask = LPC32XX_CLKPWR_EXTSRC_GPI_00_BIT,
+        },
+        [IRQ_LPC32XX_GPI_01] = {
+                .event_group = &lpc32xx_event_pin_regs,
+                .mask = LPC32XX_CLKPWR_EXTSRC_GPI_01_BIT,
+        },
+        [IRQ_LPC32XX_GPI_02] = {
+                .event_group = &lpc32xx_event_pin_regs,
+                .mask = LPC32XX_CLKPWR_EXTSRC_GPI_02_BIT,
+        },
+        [IRQ_LPC32XX_GPI_03] = {
+                .event_group = &lpc32xx_event_pin_regs,
+                .mask = LPC32XX_CLKPWR_EXTSRC_GPI_03_BIT,
+        },
+        [IRQ_LPC32XX_GPI_04] = {
+                .event_group = &lpc32xx_event_pin_regs,
+                .mask = LPC32XX_CLKPWR_EXTSRC_GPI_04_BIT,
+        },
+        [IRQ_LPC32XX_GPI_05] = {
+                .event_group = &lpc32xx_event_pin_regs,
+                .mask = LPC32XX_CLKPWR_EXTSRC_GPI_05_BIT,
+        },
+        [IRQ_LPC32XX_GPI_06] = {
+                .event_group = &lpc32xx_event_pin_regs,
+                .mask = LPC32XX_CLKPWR_EXTSRC_GPI_06_BIT,
+        },
+        [IRQ_LPC32XX_GPIO_00] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_GPIO_00_BIT,
+        },
+        [IRQ_LPC32XX_GPIO_01] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_GPIO_01_BIT,
+        },
+        [IRQ_LPC32XX_GPIO_02] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_GPIO_02_BIT,
+        },
+        [IRQ_LPC32XX_GPIO_03] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_GPIO_03_BIT,
+        },
+        [IRQ_LPC32XX_GPIO_04] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_GPIO_04_BIT,
+        },
+        [IRQ_LPC32XX_GPIO_05] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_GPIO_05_BIT,
+        },
+        [IRQ_LPC32XX_KEY] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_KEY_BIT,
+        },
+        [IRQ_LPC32XX_USB_OTG_ATX] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_USBATXINT_BIT,
+        },
+        [IRQ_LPC32XX_USB_HOST] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_USB_BIT,
+        },
+        [IRQ_LPC32XX_RTC] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_RTC_BIT,
+        },
+        [IRQ_LPC32XX_MSTIMER] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT,
+        },
+        [IRQ_LPC32XX_TS_AUX] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_TS_AUX_BIT,
+        },
+        [IRQ_LPC32XX_TS_P] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_TS_P_BIT,
+        },
+        [IRQ_LPC32XX_TS_IRQ] = {
+                .event_group = &lpc32xx_event_int_regs,
+                .mask = LPC32XX_CLKPWR_INTSRC_ADC_BIT,
+        },
+};
+
+static void get_controller(unsigned int irq, unsigned int *base,
+        unsigned int *irqbit)
+{
+        if (irq < 32) {
+                *base = LPC32XX_MIC_BASE;
+                *irqbit = 1 << irq;
+        } else if (irq < 64) {
+                *base = LPC32XX_SIC1_BASE;
+                *irqbit = 1 << (irq - 32);
+        } else {
+                *base = LPC32XX_SIC2_BASE;
+                *irqbit = 1 << (irq - 64);
+        }
+}
+
+static void lpc32xx_mask_irq(unsigned int irq)
+{
+        unsigned int reg, ctrl, mask;
+
+        get_controller(irq, &ctrl, &mask);
+
+        reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) & ~mask;
+        __raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
+}
+
+static void lpc32xx_unmask_irq(unsigned int irq)
+{
+        unsigned int reg, ctrl, mask;
+
+        get_controller(irq, &ctrl, &mask);
+
+        reg = __raw_readl(LPC32XX_INTC_MASK(ctrl)) | mask;
+        __raw_writel(reg, LPC32XX_INTC_MASK(ctrl));
+}
+
+static void lpc32xx_ack_irq(unsigned int irq)
+{
+        unsigned int ctrl, mask;
+
+        get_controller(irq, &ctrl, &mask);
+
+        __raw_writel(mask, LPC32XX_INTC_RAW_STAT(ctrl));
+
+        /* Also need to clear pending wake event */
+        if (lpc32xx_events[irq].mask != 0)
+                __raw_writel(lpc32xx_events[irq].mask,
+                        lpc32xx_events[irq].event_group->rawstat_reg);
+}
+
+static void __lpc32xx_set_irq_type(unsigned int irq, int use_high_level,
+        int use_edge)
+{
+        unsigned int reg, ctrl, mask;
+
+        get_controller(irq, &ctrl, &mask);
+
+        /* Activation level, high or low */
+        reg = __raw_readl(LPC32XX_INTC_POLAR(ctrl));
+        if (use_high_level)
+                reg |= mask;
+        else
+                reg &= ~mask;
+        __raw_writel(reg, LPC32XX_INTC_POLAR(ctrl));
+
+        /* Activation type, edge or level */
+        reg = __raw_readl(LPC32XX_INTC_ACT_TYPE(ctrl));
+        if (use_edge)
+                reg |= mask;
+        else
+                reg &= ~mask;
+        __raw_writel(reg, LPC32XX_INTC_ACT_TYPE(ctrl));
+
+        /* Use same polarity for the wake events */
+        if (lpc32xx_events[irq].mask != 0) {
+                reg = __raw_readl(lpc32xx_events[irq].event_group->edge_reg);
+
+                if (use_high_level)
+                        reg |= lpc32xx_events[irq].mask;
+                else
+                        reg &= ~lpc32xx_events[irq].mask;
+
+                __raw_writel(reg, lpc32xx_events[irq].event_group->edge_reg);
+        }
+}
+
+static int lpc32xx_set_irq_type(unsigned int irq, unsigned int type)
+{
+        switch (type) {
+        case IRQ_TYPE_EDGE_RISING:
+                /* Rising edge sensitive */
+                __lpc32xx_set_irq_type(irq, 1, 1);
+                break;
+
+        case IRQ_TYPE_EDGE_FALLING:
+                /* Falling edge sensitive */
+                __lpc32xx_set_irq_type(irq, 0, 1);
+                break;
+
+        case IRQ_TYPE_LEVEL_LOW:
+                /* Low level sensitive */
+                __lpc32xx_set_irq_type(irq, 0, 0);
+                break;
+
+        case IRQ_TYPE_LEVEL_HIGH:
+                /* High level sensitive */
+                __lpc32xx_set_irq_type(irq, 1, 0);
+                break;
+
+        /* Other modes are not supported */
+        default:
+                return -EINVAL;
+        }
+
+        /* Ok to use the level handler for all types */
+        set_irq_handler(irq, handle_level_irq);
+
+        return 0;
+}
+
+static int lpc32xx_irq_wake(unsigned int irqno, unsigned int state)
+{
+        unsigned long eventreg;
+
+        if (lpc32xx_events[irqno].mask != 0) {
+                eventreg = __raw_readl(lpc32xx_events[irqno].
+                        event_group->enab_reg);
+
+                if (state)
+                        eventreg |= lpc32xx_events[irqno].mask;
+                else
+                        eventreg &= ~lpc32xx_events[irqno].mask;
+
+                __raw_writel(eventreg,
+                        lpc32xx_events[irqno].event_group->enab_reg);
+
+                return 0;
+        }
+
+        /* Clear event */
+        __raw_writel(lpc32xx_events[irqno].mask,
+                lpc32xx_events[irqno].event_group->rawstat_reg);
+
+        return -ENODEV;
+}
+
+static void __init lpc32xx_set_default_mappings(unsigned int apr,
+        unsigned int atr, unsigned int offset)
+{
+        unsigned int i;
+
+        /* Set activation levels for each interrupt */
+        i = 0;
+        while (i < 32) {
+                __lpc32xx_set_irq_type(offset + i, ((apr >> i) & 0x1),
+                        ((atr >> i) & 0x1));
+                i++;
+        }
+}
+
+static struct irq_chip lpc32xx_irq_chip = {
+        .ack = lpc32xx_ack_irq,
+        .mask = lpc32xx_mask_irq,
+        .unmask = lpc32xx_unmask_irq,
+        .set_type = lpc32xx_set_irq_type,
+        .set_wake = lpc32xx_irq_wake
+};
+
+static void lpc32xx_sic1_handler(unsigned int irq, struct irq_desc *desc)
+{
+        unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC1_BASE));
+
+        while (ints != 0) {
+                int irqno = fls(ints) - 1;
+
+                ints &= ~(1 << irqno);
+
+                generic_handle_irq(LPC32XX_SIC1_IRQ(irqno));
+        }
+}
+
+static void lpc32xx_sic2_handler(unsigned int irq, struct irq_desc *desc)
+{
+        unsigned long ints = __raw_readl(LPC32XX_INTC_STAT(LPC32XX_SIC2_BASE));
+
+        while (ints != 0) {
+                int irqno = fls(ints) - 1;
+
+                ints &= ~(1 << irqno);
+
+                generic_handle_irq(LPC32XX_SIC2_IRQ(irqno));
+        }
+}
+
+void __init lpc32xx_init_irq(void)
+{
+        unsigned int i;
+
+        /* Setup MIC */
+        __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
+        __raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_MIC_BASE));
+        __raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_MIC_BASE));
+
+        /* Setup SIC1 */
+        __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
+        __raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC1_BASE));
+        __raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC1_BASE));
+
+        /* Setup SIC2 */
+        __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
+        __raw_writel(MIC_APR_DEFAULT, LPC32XX_INTC_POLAR(LPC32XX_SIC2_BASE));
+        __raw_writel(MIC_ATR_DEFAULT, LPC32XX_INTC_ACT_TYPE(LPC32XX_SIC2_BASE));
+
+        /* Configure supported IRQ's */
+        for (i = 0; i < NR_IRQS; i++) {
+                set_irq_chip(i, &lpc32xx_irq_chip);
+                set_irq_handler(i, handle_level_irq);
+                set_irq_flags(i, IRQF_VALID);
+        }
+
+        /* Set default mappings */
+        lpc32xx_set_default_mappings(MIC_APR_DEFAULT, MIC_ATR_DEFAULT, 0);
+        lpc32xx_set_default_mappings(SIC1_APR_DEFAULT, SIC1_ATR_DEFAULT, 32);
+        lpc32xx_set_default_mappings(SIC2_APR_DEFAULT, SIC2_ATR_DEFAULT, 64);
+
+        /* mask all interrupts except SUBIRQ */
+        __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_MIC_BASE));
+        __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC1_BASE));
+        __raw_writel(0, LPC32XX_INTC_MASK(LPC32XX_SIC2_BASE));
+
+        /* MIC SUBIRQx interrupts will route handling to the chain handlers */
+        set_irq_chained_handler(IRQ_LPC32XX_SUB1IRQ, lpc32xx_sic1_handler);
+        set_irq_chained_handler(IRQ_LPC32XX_SUB2IRQ, lpc32xx_sic2_handler);
+
+        /* Initially disable all wake events */
+        __raw_writel(0, LPC32XX_CLKPWR_P01_ER);
+        __raw_writel(0, LPC32XX_CLKPWR_INT_ER);
+        __raw_writel(0, LPC32XX_CLKPWR_PIN_ER);
+
+        /*
+         * Default wake activation polarities, all pin sources are low edge
+         * triggered
+         */
+        __raw_writel(LPC32XX_CLKPWR_INTSRC_TS_P_BIT |
+                LPC32XX_CLKPWR_INTSRC_MSTIMER_BIT |
+                LPC32XX_CLKPWR_INTSRC_RTC_BIT,
+                LPC32XX_CLKPWR_INT_AP);
+        __raw_writel(0, LPC32XX_CLKPWR_PIN_AP);
+
+        /* Clear latched wake event states */
+        __raw_writel(__raw_readl(LPC32XX_CLKPWR_PIN_RS),
+                LPC32XX_CLKPWR_PIN_RS);
+        __raw_writel(__raw_readl(LPC32XX_CLKPWR_INT_RS),
+                LPC32XX_CLKPWR_INT_RS);
+}