/*
   * 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
  "))
  		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
  "))
  		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_nocache(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;

  	bus->host_pdev = NULL;

  	/* 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;
  
  	/* 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;
  	bus->host_pdev = pdev;
  
  	/* 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 */