/*
 * Broadcom specific AMBA
 * Bus scanning
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 */

#include "scan.h"
#include "bcma_private.h"

#include <linux/bcma/bcma.h>
#include <linux/bcma/bcma_regs.h>
#include <linux/pci.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>

struct bcma_device_id_name {
	u16 id;
	const char *name;
};
struct bcma_device_id_name bcma_device_names[] = {
	{ BCMA_CORE_OOB_ROUTER, "OOB Router" },
	{ BCMA_CORE_INVALID, "Invalid" },
	{ BCMA_CORE_CHIPCOMMON, "ChipCommon" },
	{ BCMA_CORE_ILINE20, "ILine 20" },
	{ BCMA_CORE_SRAM, "SRAM" },
	{ BCMA_CORE_SDRAM, "SDRAM" },
	{ BCMA_CORE_PCI, "PCI" },
	{ BCMA_CORE_MIPS, "MIPS" },
	{ BCMA_CORE_ETHERNET, "Fast Ethernet" },
	{ BCMA_CORE_V90, "V90" },
	{ BCMA_CORE_USB11_HOSTDEV, "USB 1.1 Hostdev" },
	{ BCMA_CORE_ADSL, "ADSL" },
	{ BCMA_CORE_ILINE100, "ILine 100" },
	{ BCMA_CORE_IPSEC, "IPSEC" },
	{ BCMA_CORE_UTOPIA, "UTOPIA" },
	{ BCMA_CORE_PCMCIA, "PCMCIA" },
	{ BCMA_CORE_INTERNAL_MEM, "Internal Memory" },
	{ BCMA_CORE_MEMC_SDRAM, "MEMC SDRAM" },
	{ BCMA_CORE_OFDM, "OFDM" },
	{ BCMA_CORE_EXTIF, "EXTIF" },
	{ BCMA_CORE_80211, "IEEE 802.11" },
	{ BCMA_CORE_PHY_A, "PHY A" },
	{ BCMA_CORE_PHY_B, "PHY B" },
	{ BCMA_CORE_PHY_G, "PHY G" },
	{ BCMA_CORE_MIPS_3302, "MIPS 3302" },
	{ BCMA_CORE_USB11_HOST, "USB 1.1 Host" },
	{ BCMA_CORE_USB11_DEV, "USB 1.1 Device" },
	{ BCMA_CORE_USB20_HOST, "USB 2.0 Host" },
	{ BCMA_CORE_USB20_DEV, "USB 2.0 Device" },
	{ BCMA_CORE_SDIO_HOST, "SDIO Host" },
	{ BCMA_CORE_ROBOSWITCH, "Roboswitch" },
	{ BCMA_CORE_PARA_ATA, "PATA" },
	{ BCMA_CORE_SATA_XORDMA, "SATA XOR-DMA" },
	{ BCMA_CORE_ETHERNET_GBIT, "GBit Ethernet" },
	{ BCMA_CORE_PCIE, "PCIe" },
	{ BCMA_CORE_PHY_N, "PHY N" },
	{ BCMA_CORE_SRAM_CTL, "SRAM Controller" },
	{ BCMA_CORE_MINI_MACPHY, "Mini MACPHY" },
	{ BCMA_CORE_ARM_1176, "ARM 1176" },
	{ BCMA_CORE_ARM_7TDMI, "ARM 7TDMI" },
	{ BCMA_CORE_PHY_LP, "PHY LP" },
	{ BCMA_CORE_PMU, "PMU" },
	{ BCMA_CORE_PHY_SSN, "PHY SSN" },
	{ BCMA_CORE_SDIO_DEV, "SDIO Device" },
	{ BCMA_CORE_ARM_CM3, "ARM CM3" },
	{ BCMA_CORE_PHY_HT, "PHY HT" },
	{ BCMA_CORE_MIPS_74K, "MIPS 74K" },
	{ BCMA_CORE_MAC_GBIT, "GBit MAC" },
	{ BCMA_CORE_DDR12_MEM_CTL, "DDR1/DDR2 Memory Controller" },
	{ BCMA_CORE_PCIE_RC, "PCIe Root Complex" },
	{ BCMA_CORE_OCP_OCP_BRIDGE, "OCP to OCP Bridge" },
	{ BCMA_CORE_SHARED_COMMON, "Common Shared" },
	{ BCMA_CORE_OCP_AHB_BRIDGE, "OCP to AHB Bridge" },
	{ BCMA_CORE_SPI_HOST, "SPI Host" },
	{ BCMA_CORE_I2S, "I2S" },
	{ BCMA_CORE_SDR_DDR1_MEM_CTL, "SDR/DDR1 Memory Controller" },
	{ BCMA_CORE_SHIM, "SHIM" },
	{ BCMA_CORE_DEFAULT, "Default" },
};
const char *bcma_device_name(struct bcma_device_id *id)
{
	int i;

	if (id->manuf == BCMA_MANUF_BCM) {
		for (i = 0; i < ARRAY_SIZE(bcma_device_names); i++) {
			if (bcma_device_names[i].id == id->id)
				return bcma_device_names[i].name;
		}
	}
	return "UNKNOWN";
}

static u32 bcma_scan_read32(struct bcma_bus *bus, u8 current_coreidx,
		       u16 offset)
{
	return readl(bus->mmio + offset);
}

static void bcma_scan_switch_core(struct bcma_bus *bus, u32 addr)
{
	if (bus->hosttype == BCMA_HOSTTYPE_PCI)
		pci_write_config_dword(bus->host_pci, BCMA_PCI_BAR0_WIN,
				       addr);
}

static u32 bcma_erom_get_ent(struct bcma_bus *bus, u32 **eromptr)
{
	u32 ent = readl(*eromptr);
	(*eromptr)++;
	return ent;
}

static void bcma_erom_push_ent(u32 **eromptr)
{
	(*eromptr)--;
}

static s32 bcma_erom_get_ci(struct bcma_bus *bus, u32 **eromptr)
{
	u32 ent = bcma_erom_get_ent(bus, eromptr);
	if (!(ent & SCAN_ER_VALID))
		return -ENOENT;
	if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_CI)
		return -ENOENT;
	return ent;
}

static bool bcma_erom_is_end(struct bcma_bus *bus, u32 **eromptr)
{
	u32 ent = bcma_erom_get_ent(bus, eromptr);
	bcma_erom_push_ent(eromptr);
	return (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID));
}

static bool bcma_erom_is_bridge(struct bcma_bus *bus, u32 **eromptr)
{
	u32 ent = bcma_erom_get_ent(bus, eromptr);
	bcma_erom_push_ent(eromptr);
	return (((ent & SCAN_ER_VALID)) &&
		((ent & SCAN_ER_TAGX) == SCAN_ER_TAG_ADDR) &&
		((ent & SCAN_ADDR_TYPE) == SCAN_ADDR_TYPE_BRIDGE));
}

static void bcma_erom_skip_component(struct bcma_bus *bus, u32 **eromptr)
{
	u32 ent;
	while (1) {
		ent = bcma_erom_get_ent(bus, eromptr);
		if ((ent & SCAN_ER_VALID) &&
		    ((ent & SCAN_ER_TAG) == SCAN_ER_TAG_CI))
			break;
		if (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID))
			break;
	}
	bcma_erom_push_ent(eromptr);
}

static s32 bcma_erom_get_mst_port(struct bcma_bus *bus, u32 **eromptr)
{
	u32 ent = bcma_erom_get_ent(bus, eromptr);
	if (!(ent & SCAN_ER_VALID))
		return -ENOENT;
	if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_MP)
		return -ENOENT;
	return ent;
}

static s32 bcma_erom_get_addr_desc(struct bcma_bus *bus, u32 **eromptr,
				  u32 type, u8 port)
{
	u32 addrl, addrh, sizel, sizeh = 0;
	u32 size;

	u32 ent = bcma_erom_get_ent(bus, eromptr);
	if ((!(ent & SCAN_ER_VALID)) ||
	    ((ent & SCAN_ER_TAGX) != SCAN_ER_TAG_ADDR) ||
	    ((ent & SCAN_ADDR_TYPE) != type) ||
	    (((ent & SCAN_ADDR_PORT) >> SCAN_ADDR_PORT_SHIFT) != port)) {
		bcma_erom_push_ent(eromptr);
		return -EINVAL;
	}

	addrl = ent & SCAN_ADDR_ADDR;
	if (ent & SCAN_ADDR_AG32)
		addrh = bcma_erom_get_ent(bus, eromptr);
	else
		addrh = 0;

	if ((ent & SCAN_ADDR_SZ) == SCAN_ADDR_SZ_SZD) {
		size = bcma_erom_get_ent(bus, eromptr);
		sizel = size & SCAN_SIZE_SZ;
		if (size & SCAN_SIZE_SG32)
			sizeh = bcma_erom_get_ent(bus, eromptr);
	} else
		sizel = SCAN_ADDR_SZ_BASE <<
				((ent & SCAN_ADDR_SZ) >> SCAN_ADDR_SZ_SHIFT);

	return addrl;
}

int bcma_bus_scan(struct bcma_bus *bus)
{
	u32 erombase;
	u32 __iomem *eromptr, *eromend;

	s32 cia, cib;
	u8 ports[2], wrappers[2];

	s32 tmp;
	u8 i, j;

	int err;

	INIT_LIST_HEAD(&bus->cores);
	bus->nr_cores = 0;

	bcma_scan_switch_core(bus, BCMA_ADDR_BASE);

	tmp = bcma_scan_read32(bus, 0, BCMA_CC_ID);
	bus->chipinfo.id = (tmp & BCMA_CC_ID_ID) >> BCMA_CC_ID_ID_SHIFT;
	bus->chipinfo.rev = (tmp & BCMA_CC_ID_REV) >> BCMA_CC_ID_REV_SHIFT;
	bus->chipinfo.pkg = (tmp & BCMA_CC_ID_PKG) >> BCMA_CC_ID_PKG_SHIFT;

	erombase = bcma_scan_read32(bus, 0, BCMA_CC_EROM);
	eromptr = bus->mmio;
	eromend = eromptr + BCMA_CORE_SIZE / sizeof(u32);

	bcma_scan_switch_core(bus, erombase);

	while (eromptr < eromend) {
		struct bcma_device *core = kzalloc(sizeof(*core), GFP_KERNEL);
		if (!core)
			return -ENOMEM;
		INIT_LIST_HEAD(&core->list);
		core->bus = bus;

		/* get CIs */
		cia = bcma_erom_get_ci(bus, &eromptr);
		if (cia < 0) {
			bcma_erom_push_ent(&eromptr);
			if (bcma_erom_is_end(bus, &eromptr))
				break;
			err= -EILSEQ;
			goto out;
		}
		cib = bcma_erom_get_ci(bus, &eromptr);
		if (cib < 0) {
			err= -EILSEQ;
			goto out;
		}

		/* parse CIs */
		core->id.class = (cia & SCAN_CIA_CLASS) >> SCAN_CIA_CLASS_SHIFT;
		core->id.id = (cia & SCAN_CIA_ID) >> SCAN_CIA_ID_SHIFT;
		core->id.manuf = (cia & SCAN_CIA_MANUF) >> SCAN_CIA_MANUF_SHIFT;
		ports[0] = (cib & SCAN_CIB_NMP) >> SCAN_CIB_NMP_SHIFT;
		ports[1] = (cib & SCAN_CIB_NSP) >> SCAN_CIB_NSP_SHIFT;
		wrappers[0] = (cib & SCAN_CIB_NMW) >> SCAN_CIB_NMW_SHIFT;
		wrappers[1] = (cib & SCAN_CIB_NSW) >> SCAN_CIB_NSW_SHIFT;
		core->id.rev = (cib & SCAN_CIB_REV) >> SCAN_CIB_REV_SHIFT;

		if (((core->id.manuf == BCMA_MANUF_ARM) &&
		     (core->id.id == 0xFFF)) ||
		    (ports[1] == 0)) {
			bcma_erom_skip_component(bus, &eromptr);
			continue;
		}

		/* check if component is a core at all */
		if (wrappers[0] + wrappers[1] == 0) {
			/* we could save addrl of the router
			if (cid == BCMA_CORE_OOB_ROUTER)
			 */
			bcma_erom_skip_component(bus, &eromptr);
			continue;
		}

		if (bcma_erom_is_bridge(bus, &eromptr)) {
			bcma_erom_skip_component(bus, &eromptr);
			continue;
		}

		/* get & parse master ports */
		for (i = 0; i < ports[0]; i++) {
			u32 mst_port_d = bcma_erom_get_mst_port(bus, &eromptr);
			if (mst_port_d < 0) {
				err= -EILSEQ;
				goto out;
			}
		}

		/* get & parse slave ports */
		for (i = 0; i < ports[1]; i++) {
			for (j = 0; ; j++) {
				tmp = bcma_erom_get_addr_desc(bus, &eromptr,
					SCAN_ADDR_TYPE_SLAVE, i);
				if (tmp < 0) {
					/* no more entries for port _i_ */
					/* pr_debug("erom: slave port %d "
					 * "has %d descriptors\n", i, j); */
					break;
				} else {
					if (i == 0 && j == 0)
						core->addr = tmp;
				}
			}
		}

		/* get & parse master wrappers */
		for (i = 0; i < wrappers[0]; i++) {
			for (j = 0; ; j++) {
				tmp = bcma_erom_get_addr_desc(bus, &eromptr,
					SCAN_ADDR_TYPE_MWRAP, i);
				if (tmp < 0) {
					/* no more entries for port _i_ */
					/* pr_debug("erom: master wrapper %d "
					 * "has %d descriptors\n", i, j); */
					break;
				} else {
					if (i == 0 && j == 0)
						core->wrap = tmp;
				}
			}
		}

		/* get & parse slave wrappers */
		for (i = 0; i < wrappers[1]; i++) {
			u8 hack = (ports[1] == 1) ? 0 : 1;
			for (j = 0; ; j++) {
				tmp = bcma_erom_get_addr_desc(bus, &eromptr,
					SCAN_ADDR_TYPE_SWRAP, i + hack);
				if (tmp < 0) {
					/* no more entries for port _i_ */
					/* pr_debug("erom: master wrapper %d "
					 * has %d descriptors\n", i, j); */
					break;
				} else {
					if (wrappers[0] == 0 && !i && !j)
						core->wrap = tmp;
				}
			}
		}

		pr_info("Core %d found: %s "
			"(manuf 0x%03X, id 0x%03X, rev 0x%02X, class 0x%X)\n",
			bus->nr_cores, bcma_device_name(&core->id),
			core->id.manuf, core->id.id, core->id.rev,
			core->id.class);

		core->core_index = bus->nr_cores++;
		list_add(&core->list, &bus->cores);
		continue;
out:
		return err;
	}

	return 0;
}