/*
 * linux/arch/arm/mach-sa1100/neponset.c
 *
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <asm/irq.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/mach/serial_sa1100.h>
#include <mach/assabet.h>
#include <mach/neponset.h>
#include <asm/hardware/sa1111.h>
#include <asm/sizes.h>

/*
 * Install handler for Neponset IRQ.  Note that we have to loop here
 * since the ETHERNET and USAR IRQs are level based, and we need to
 * ensure that the IRQ signal is deasserted before returning.  This
 * is rather unfortunate.
 */
static void
neponset_irq_handler(unsigned int irq, struct irq_desc *desc)
{
        unsigned int irr;

        while (1) {
                /*
                 * Acknowledge the parent IRQ.
                 */
                desc->chip->ack(irq);

                /*
                 * Read the interrupt reason register.  Let's have all
                 * active IRQ bits high.  Note: there is a typo in the
                 * Neponset user's guide for the SA1111 IRR level.
                 */
                irr = IRR ^ (IRR_ETHERNET | IRR_USAR);

                if ((irr & (IRR_ETHERNET | IRR_USAR | IRR_SA1111)) == 0)
                        break;

                /*
                 * Since there is no individual mask, we have to
                 * mask the parent IRQ.  This is safe, since we'll
                 * recheck the register for any pending IRQs.
                 */
                if (irr & (IRR_ETHERNET | IRR_USAR)) {
                        desc->chip->mask(irq);

                        /*
                         * Ack the interrupt now to prevent re-entering
                         * this neponset handler.  Again, this is safe
                         * since we'll check the IRR register prior to
                         * leaving.
                         */
                        desc->chip->ack(irq);

                        if (irr & IRR_ETHERNET) {
                                generic_handle_irq(IRQ_NEPONSET_SMC9196);
                        }

                        if (irr & IRR_USAR) {
                                generic_handle_irq(IRQ_NEPONSET_USAR);
                        }

                        desc->chip->unmask(irq);
                }

                if (irr & IRR_SA1111) {
                        generic_handle_irq(IRQ_NEPONSET_SA1111);
                }
        }
}

static void neponset_set_mctrl(struct uart_port *port, u_int mctrl)
{
        u_int mdm_ctl0 = MDM_CTL_0;

        if (port->mapbase == _Ser1UTCR0) {
                if (mctrl & TIOCM_RTS)
                        mdm_ctl0 &= ~MDM_CTL0_RTS2;
                else
                        mdm_ctl0 |= MDM_CTL0_RTS2;

                if (mctrl & TIOCM_DTR)
                        mdm_ctl0 &= ~MDM_CTL0_DTR2;
                else
                        mdm_ctl0 |= MDM_CTL0_DTR2;
        } else if (port->mapbase == _Ser3UTCR0) {
                if (mctrl & TIOCM_RTS)
                        mdm_ctl0 &= ~MDM_CTL0_RTS1;
                else
                        mdm_ctl0 |= MDM_CTL0_RTS1;

                if (mctrl & TIOCM_DTR)
                        mdm_ctl0 &= ~MDM_CTL0_DTR1;
                else
                        mdm_ctl0 |= MDM_CTL0_DTR1;
        }

        MDM_CTL_0 = mdm_ctl0;
}

static u_int neponset_get_mctrl(struct uart_port *port)
{
        u_int ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
        u_int mdm_ctl1 = MDM_CTL_1;

        if (port->mapbase == _Ser1UTCR0) {
                if (mdm_ctl1 & MDM_CTL1_DCD2)
                        ret &= ~TIOCM_CD;
                if (mdm_ctl1 & MDM_CTL1_CTS2)
                        ret &= ~TIOCM_CTS;
                if (mdm_ctl1 & MDM_CTL1_DSR2)
                        ret &= ~TIOCM_DSR;
        } else if (port->mapbase == _Ser3UTCR0) {
                if (mdm_ctl1 & MDM_CTL1_DCD1)
                        ret &= ~TIOCM_CD;
                if (mdm_ctl1 & MDM_CTL1_CTS1)
                        ret &= ~TIOCM_CTS;
                if (mdm_ctl1 & MDM_CTL1_DSR1)
                        ret &= ~TIOCM_DSR;
        }

        return ret;
}

static struct sa1100_port_fns neponset_port_fns __devinitdata = {
        .set_mctrl      = neponset_set_mctrl,
        .get_mctrl      = neponset_get_mctrl,
};

static int __devinit neponset_probe(struct platform_device *dev)
{
        sa1100_register_uart_fns(&neponset_port_fns);

        /*
         * Install handler for GPIO25.
         */
        set_irq_type(IRQ_GPIO25, IRQ_TYPE_EDGE_RISING);
        set_irq_chained_handler(IRQ_GPIO25, neponset_irq_handler);

        /*
         * We would set IRQ_GPIO25 to be a wake-up IRQ, but
         * unfortunately something on the Neponset activates
         * this IRQ on sleep (ethernet?)
         */
#if 0
        enable_irq_wake(IRQ_GPIO25);
#endif

        /*
         * Setup other Neponset IRQs.  SA1111 will be done by the
         * generic SA1111 code.
         */
        set_irq_handler(IRQ_NEPONSET_SMC9196, handle_simple_irq);
        set_irq_flags(IRQ_NEPONSET_SMC9196, IRQF_VALID | IRQF_PROBE);
        set_irq_handler(IRQ_NEPONSET_USAR, handle_simple_irq);
        set_irq_flags(IRQ_NEPONSET_USAR, IRQF_VALID | IRQF_PROBE);

        /*
         * Disable GPIO 0/1 drivers so the buttons work on the module.
         */
        NCR_0 = NCR_GP01_OFF;

        return 0;
}

#ifdef CONFIG_PM

/*
 * LDM power management.
 */
static unsigned int neponset_saved_state;

static int neponset_suspend(struct platform_device *dev, pm_message_t state)
{
        /*
         * Save state.
         */
        neponset_saved_state = NCR_0;

        return 0;
}

static int neponset_resume(struct platform_device *dev)
{
        NCR_0 = neponset_saved_state;

        return 0;
}

#else
#define neponset_suspend NULL
#define neponset_resume  NULL
#endif

static struct platform_driver neponset_device_driver = {
        .probe          = neponset_probe,
        .suspend        = neponset_suspend,
        .resume         = neponset_resume,
        .driver         = {
                .name   = "neponset",
        },
};

static struct resource neponset_resources[] = {
        [0] = {
                .start  = 0x10000000,
                .end    = 0x17ffffff,
                .flags  = IORESOURCE_MEM,
        },
};

static struct platform_device neponset_device = {
        .name           = "neponset",
        .id             = 0,
        .num_resources  = ARRAY_SIZE(neponset_resources),
        .resource       = neponset_resources,
};

static struct resource sa1111_resources[] = {
        [0] = {
                .start  = 0x40000000,
                .end    = 0x40001fff,
                .flags  = IORESOURCE_MEM,
        },
        [1] = {
                .start  = IRQ_NEPONSET_SA1111,
                .end    = IRQ_NEPONSET_SA1111,
                .flags  = IORESOURCE_IRQ,
        },
};

static u64 sa1111_dmamask = 0xffffffffUL;

static struct platform_device sa1111_device = {
        .name           = "sa1111",
        .id             = 0,
        .dev            = {
                .dma_mask = &sa1111_dmamask,
                .coherent_dma_mask = 0xffffffff,
        },
        .num_resources  = ARRAY_SIZE(sa1111_resources),
        .resource       = sa1111_resources,
};

static struct resource smc91x_resources[] = {
        [0] = {
                .name   = "smc91x-regs",
                .start  = SA1100_CS3_PHYS,
                .end    = SA1100_CS3_PHYS + 0x01ffffff,
                .flags  = IORESOURCE_MEM,
        },
        [1] = {
                .start  = IRQ_NEPONSET_SMC9196,
                .end    = IRQ_NEPONSET_SMC9196,
                .flags  = IORESOURCE_IRQ,
        },
        [2] = {
                .name   = "smc91x-attrib",
                .start  = SA1100_CS3_PHYS + 0x02000000,
                .end    = SA1100_CS3_PHYS + 0x03ffffff,
                .flags  = IORESOURCE_MEM,
        },
};

static struct platform_device smc91x_device = {
        .name           = "smc91x",
        .id             = 0,
        .num_resources  = ARRAY_SIZE(smc91x_resources),
        .resource       = smc91x_resources,
};

static struct platform_device *devices[] __initdata = {
        &neponset_device,
        &sa1111_device,
        &smc91x_device,
};

extern void sa1110_mb_disable(void);

static int __init neponset_init(void)
{
        platform_driver_register(&neponset_device_driver);

        /*
         * The Neponset is only present on the Assabet machine type.
         */
        if (!machine_is_assabet())
                return -ENODEV;

        /*
         * Ensure that the memory bus request/grant signals are setup,
         * and the grant is held in its inactive state, whether or not
         * we actually have a Neponset attached.
         */
        sa1110_mb_disable();

        if (!machine_has_neponset()) {
                printk(KERN_DEBUG "Neponset expansion board not present\n");
                return -ENODEV;
        }

        if (WHOAMI != 0x11) {
                printk(KERN_WARNING "Neponset board detected, but "
                        "wrong ID: %02x\n", WHOAMI);
                return -ENODEV;
        }

        return platform_add_devices(devices, ARRAY_SIZE(devices));
}

subsys_initcall(neponset_init);

static struct map_desc neponset_io_desc[] __initdata = {
        {       /* System Registers */
                .virtual        =  0xf3000000,
                .pfn            = __phys_to_pfn(0x10000000),
                .length         = SZ_1M,
                .type           = MT_DEVICE
        }, {    /* SA-1111 */
                .virtual        =  0xf4000000,
                .pfn            = __phys_to_pfn(0x40000000),
                .length         = SZ_1M,
                .type           = MT_DEVICE
        }
};

void __init neponset_map_io(void)
{
        iotable_init(neponset_io_desc, ARRAY_SIZE(neponset_io_desc));
}