/*
 * Broadcom specific AMBA
 * System on Chip (SoC) Host
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 */

#include "bcma_private.h"
#include "scan.h"
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/bcma/bcma.h>
#include <linux/bcma/bcma_soc.h>

static u8 bcma_host_soc_read8(struct bcma_device *core, u16 offset)
{
        return readb(core->io_addr + offset);
}

static u16 bcma_host_soc_read16(struct bcma_device *core, u16 offset)
{
        return readw(core->io_addr + offset);
}

static u32 bcma_host_soc_read32(struct bcma_device *core, u16 offset)
{
        return readl(core->io_addr + offset);
}

static void bcma_host_soc_write8(struct bcma_device *core, u16 offset,
                                 u8 value)
{
        writeb(value, core->io_addr + offset);
}

static void bcma_host_soc_write16(struct bcma_device *core, u16 offset,
                                 u16 value)
{
        writew(value, core->io_addr + offset);
}

static void bcma_host_soc_write32(struct bcma_device *core, u16 offset,
                                 u32 value)
{
        writel(value, core->io_addr + offset);
}

#ifdef CONFIG_BCMA_BLOCKIO
static void bcma_host_soc_block_read(struct bcma_device *core, void *buffer,
                                     size_t count, u16 offset, u8 reg_width)
{
        void __iomem *addr = core->io_addr + offset;

        switch (reg_width) {
        case sizeof(u8): {
                u8 *buf = buffer;

                while (count) {
                        *buf = __raw_readb(addr);
                        buf++;
                        count--;
                }
                break;
        }
        case sizeof(u16): {
                __le16 *buf = buffer;

                WARN_ON(count & 1);
                while (count) {
                        *buf = (__force __le16)__raw_readw(addr);
                        buf++;
                        count -= 2;
                }
                break;
        }
        case sizeof(u32): {
                __le32 *buf = buffer;

                WARN_ON(count & 3);
                while (count) {
                        *buf = (__force __le32)__raw_readl(addr);
                        buf++;
                        count -= 4;
                }
                break;
        }
        default:
                WARN_ON(1);
        }
}

static void bcma_host_soc_block_write(struct bcma_device *core,
                                      const void *buffer,
                                      size_t count, u16 offset, u8 reg_width)
{
        void __iomem *addr = core->io_addr + offset;

        switch (reg_width) {
        case sizeof(u8): {
                const u8 *buf = buffer;

                while (count) {
                        __raw_writeb(*buf, addr);
                        buf++;
                        count--;
                }
                break;
        }
        case sizeof(u16): {
                const __le16 *buf = buffer;

                WARN_ON(count & 1);
                while (count) {
                        __raw_writew((__force u16)(*buf), addr);
                        buf++;
                        count -= 2;
                }
                break;
        }
        case sizeof(u32): {
                const __le32 *buf = buffer;

                WARN_ON(count & 3);
                while (count) {
                        __raw_writel((__force u32)(*buf), addr);
                        buf++;
                        count -= 4;
                }
                break;
        }
        default:
                WARN_ON(1);
        }
}
#endif /* CONFIG_BCMA_BLOCKIO */

static u32 bcma_host_soc_aread32(struct bcma_device *core, u16 offset)
{
        if (WARN_ONCE(!core->io_wrap, "Accessed core has no wrapper/agent\n"))
                return ~0;
        return readl(core->io_wrap + offset);
}

static void bcma_host_soc_awrite32(struct bcma_device *core, u16 offset,
                                  u32 value)
{
        if (WARN_ONCE(!core->io_wrap, "Accessed core has no wrapper/agent\n"))
                return;
        writel(value, core->io_wrap + offset);
}

static const struct bcma_host_ops bcma_host_soc_ops = {
        .read8          = bcma_host_soc_read8,
        .read16         = bcma_host_soc_read16,
        .read32         = bcma_host_soc_read32,
        .write8         = bcma_host_soc_write8,
        .write16        = bcma_host_soc_write16,
        .write32        = bcma_host_soc_write32,
#ifdef CONFIG_BCMA_BLOCKIO
        .block_read     = bcma_host_soc_block_read,
        .block_write    = bcma_host_soc_block_write,
#endif
        .aread32        = bcma_host_soc_aread32,
        .awrite32       = bcma_host_soc_awrite32,
};

int __init bcma_host_soc_register(struct bcma_soc *soc)
{
        struct bcma_bus *bus = &soc->bus;

        /* iomap only first core. We have to read some register on this core
         * to scan the bus.
         */
        bus->mmio = ioremap(BCMA_ADDR_BASE, BCMA_CORE_SIZE * 1);
        if (!bus->mmio)
                return -ENOMEM;

        /* Host specific */
        bus->hosttype = BCMA_HOSTTYPE_SOC;
        bus->ops = &bcma_host_soc_ops;

        /* Initialize struct, detect chip */
        bcma_init_bus(bus);

        return 0;
}

int __init bcma_host_soc_init(struct bcma_soc *soc)
{
        struct bcma_bus *bus = &soc->bus;
        int err;

        /* Scan bus and initialize it */
        err = bcma_bus_early_register(bus);
        if (err)
                iounmap(bus->mmio);

        return err;
}

#ifdef CONFIG_OF
static int bcma_host_soc_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct device_node *np = dev->of_node;
        struct bcma_bus *bus;
        int err;

        /* Alloc */
        bus = devm_kzalloc(dev, sizeof(*bus), GFP_KERNEL);
        if (!bus)
                return -ENOMEM;

        bus->dev = dev;

        /* Map MMIO */
        bus->mmio = of_iomap(np, 0);
        if (!bus->mmio)
                return -ENOMEM;

        /* Host specific */
        bus->hosttype = BCMA_HOSTTYPE_SOC;
        bus->ops = &bcma_host_soc_ops;

        /* Initialize struct, detect chip */
        bcma_init_bus(bus);

        /* Register */
        err = bcma_bus_register(bus);
        if (err)
                goto err_unmap_mmio;

        platform_set_drvdata(pdev, bus);

        return err;

err_unmap_mmio:
        iounmap(bus->mmio);
        return err;
}

static int bcma_host_soc_remove(struct platform_device *pdev)
{
        struct bcma_bus *bus = platform_get_drvdata(pdev);

        bcma_bus_unregister(bus);
        iounmap(bus->mmio);
        platform_set_drvdata(pdev, NULL);

        return 0;
}

static const struct of_device_id bcma_host_soc_of_match[] = {
        { .compatible = "brcm,bus-axi", },
        {},
};
MODULE_DEVICE_TABLE(of, bcma_host_soc_of_match);

static struct platform_driver bcma_host_soc_driver = {
        .driver = {
                .name = "bcma-host-soc",
                .of_match_table = bcma_host_soc_of_match,
        },
        .probe          = bcma_host_soc_probe,
        .remove         = bcma_host_soc_remove,
};

int __init bcma_host_soc_register_driver(void)
{
        return platform_driver_register(&bcma_host_soc_driver);
}

void __exit bcma_host_soc_unregister_driver(void)
{
        platform_driver_unregister(&bcma_host_soc_driver);
}
#endif /* CONFIG_OF */