/* SPDX-License-Identifier: GPL-2.0 */
/* parport.h: sparc64 specific parport initialization and dma.
 *
 * Copyright (C) 1999  Eddie C. Dost  (ecd@skynet.be)
 */

#ifndef _ASM_SPARC64_PARPORT_H
#define _ASM_SPARC64_PARPORT_H 1

#include <linux/of_device.h>

#include <asm/ebus_dma.h>
#include <asm/ns87303.h>
#include <asm/prom.h>

#define PARPORT_PC_MAX_PORTS    PARPORT_MAX

/*
 * While sparc64 doesn't have an ISA DMA API, we provide something that looks
 * close enough to make parport_pc happy
 */
#define HAS_DMA

static DEFINE_SPINLOCK(dma_spin_lock);

#define claim_dma_lock() \
({      unsigned long flags; \
        spin_lock_irqsave(&dma_spin_lock, flags); \
        flags; \
})

#define release_dma_lock(__flags) \
        spin_unlock_irqrestore(&dma_spin_lock, __flags);

static struct sparc_ebus_info {
        struct ebus_dma_info info;
        unsigned int addr;
        unsigned int count;
        int lock;

        struct parport *port;
} sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];

static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);

static inline int request_dma(unsigned int dmanr, const char *device_id)
{
        if (dmanr >= PARPORT_PC_MAX_PORTS)
                return -EINVAL;
        if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
                return -EBUSY;
        return 0;
}

static inline void free_dma(unsigned int dmanr)
{
        if (dmanr >= PARPORT_PC_MAX_PORTS) {
                printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
                return;
        }
        if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
                printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
                return;
        }
}

static inline void enable_dma(unsigned int dmanr)
{
        ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);

        if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
                             sparc_ebus_dmas[dmanr].addr,
                             sparc_ebus_dmas[dmanr].count))
                BUG();
}

static inline void disable_dma(unsigned int dmanr)
{
        ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
}

static inline void clear_dma_ff(unsigned int dmanr)
{
        /* nothing */
}

static inline void set_dma_mode(unsigned int dmanr, char mode)
{
        ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
}

static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
{
        sparc_ebus_dmas[dmanr].addr = addr;
}

static inline void set_dma_count(unsigned int dmanr, unsigned int count)
{
        sparc_ebus_dmas[dmanr].count = count;
}

static inline unsigned int get_dma_residue(unsigned int dmanr)
{
        return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
}

static int ecpp_probe(struct platform_device *op)
{
        unsigned long base = op->resource[0].start;
        unsigned long config = op->resource[1].start;
        unsigned long d_base = op->resource[2].start;
        unsigned long d_len;
        struct device_node *parent;
        struct parport *p;
        int slot, err;

        parent = op->dev.of_node->parent;
        if (!strcmp(parent->name, "dma")) {
                p = parport_pc_probe_port(base, base + 0x400,
                                          op->archdata.irqs[0], PARPORT_DMA_NOFIFO,
                                          op->dev.parent->parent, 0);
                if (!p)
                        return -ENOMEM;
                dev_set_drvdata(&op->dev, p);
                return 0;
        }

        for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) {
                if (!test_and_set_bit(slot, dma_slot_map))
                        break;
        }
        err = -ENODEV;
        if (slot >= PARPORT_PC_MAX_PORTS)
                goto out_err;

        spin_lock_init(&sparc_ebus_dmas[slot].info.lock);

        d_len = (op->resource[2].end - d_base) + 1UL;
        sparc_ebus_dmas[slot].info.regs =
                of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA");

        if (!sparc_ebus_dmas[slot].info.regs)
                goto out_clear_map;

        sparc_ebus_dmas[slot].info.flags = 0;
        sparc_ebus_dmas[slot].info.callback = NULL;
        sparc_ebus_dmas[slot].info.client_cookie = NULL;
        sparc_ebus_dmas[slot].info.irq = 0xdeadbeef;
        strcpy(sparc_ebus_dmas[slot].info.name, "parport");
        if (ebus_dma_register(&sparc_ebus_dmas[slot].info))
                goto out_unmap_regs;

        ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1);

        /* Configure IRQ to Push Pull, Level Low */
        /* Enable ECP, set bit 2 of the CTR first */
        outb(0x04, base + 0x02);
        ns87303_modify(config, PCR,
                       PCR_EPP_ENABLE |
                       PCR_IRQ_ODRAIN,
                       PCR_ECP_ENABLE |
                       PCR_ECP_CLK_ENA |
                       PCR_IRQ_POLAR);

        /* CTR bit 5 controls direction of port */
        ns87303_modify(config, PTR,
                       0, PTR_LPT_REG_DIR);

        p = parport_pc_probe_port(base, base + 0x400,
                                  op->archdata.irqs[0],
                                  slot,
                                  op->dev.parent,
                                  0);
        err = -ENOMEM;
        if (!p)
                goto out_disable_irq;

        dev_set_drvdata(&op->dev, p);

        return 0;

out_disable_irq:
        ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
        ebus_dma_unregister(&sparc_ebus_dmas[slot].info);

out_unmap_regs:
        of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);

out_clear_map:
        clear_bit(slot, dma_slot_map);

out_err:
        return err;
}

static int ecpp_remove(struct platform_device *op)
{
        struct parport *p = dev_get_drvdata(&op->dev);
        int slot = p->dma;

        parport_pc_unregister_port(p);

        if (slot != PARPORT_DMA_NOFIFO) {
                unsigned long d_base = op->resource[2].start;
                unsigned long d_len;

                d_len = (op->resource[2].end - d_base) + 1UL;

                ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
                ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
                of_iounmap(&op->resource[2],
                           sparc_ebus_dmas[slot].info.regs,
                           d_len);
                clear_bit(slot, dma_slot_map);
        }

        return 0;
}

static const struct of_device_id ecpp_match[] = {
        {
                .name = "ecpp",
        },
        {
                .name = "parallel",
                .compatible = "ecpp",
        },
        {
                .name = "parallel",
                .compatible = "ns87317-ecpp",
        },
        {
                .name = "parallel",
                .compatible = "pnpALI,1533,3",
        },
        {},
};

static struct platform_driver ecpp_driver = {
        .driver = {
                .name = "ecpp",
                .of_match_table = ecpp_match,
        },
        .probe                  = ecpp_probe,
        .remove                 = ecpp_remove,
};

static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
{
        return platform_driver_register(&ecpp_driver);
}

#endif /* !(_ASM_SPARC64_PARPORT_H */