host_soc.c

/*
 * 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 void 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);
}

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 */