pci.c

uboot在arm处理器s3c2410的移植代码

	unsigned int regData;
	unsigned int writeData;

	GT_REG_READ (pci_arbiter_control[host], &regData);
	writeData = (internalAgent << 14) + (externalAgent0 << 15) +
		(externalAgent1 << 16) + (externalAgent2 << 17) +
		(externalAgent3 << 18) + (externalAgent4 << 19) +
		(externalAgent5 << 20);
	regData = (regData & ~(0x7f << 14)) | writeData;
	GT_REG_WRITE (pci_arbiter_control[host], regData);
	return true;
}

/********************************************************************
* pciEnableBrokenAgentDetection - A master is said to be broken if it fails to
*                       respond to grant assertion within a window specified in
*                       the input value: 'brokenValue'.
*
* Inputs: unsigned char brokenValue -  A value which limits the Master to hold the
*                       grant without asserting frame.
* Returns:  Error for illegal broken value otherwise true.
*********************************************************************/
bool pciEnableBrokenAgentDetection (PCI_HOST host, unsigned char brokenValue)
{
	unsigned int data;
	unsigned int regData;

	if (brokenValue > 0xf)
		return false;	/* brokenValue must be 4 bit */
	data = brokenValue << 3;
	GT_REG_READ (pci_arbiter_control[host], &regData);
	regData = (regData & 0xffffff87) | data;
	GT_REG_WRITE (pci_arbiter_control[host], regData | BIT1);
	return true;
}

/********************************************************************
* pciDisableBrokenAgentDetection - This function disable the Broken agent
*                           Detection mechanism.
*                           NOTE: This operation may cause a dead lock on the
*                           pci0 arbitration.
*
* Inputs:   N/A
* Returns:  true.
*********************************************************************/
bool pciDisableBrokenAgentDetection (PCI_HOST host)
{
	unsigned int regData;

	GT_REG_READ (pci_arbiter_control[host], &regData);
	regData = regData & 0xfffffffd;
	GT_REG_WRITE (pci_arbiter_control[host], regData);
	return true;
}

/********************************************************************
* pciP2PConfig - This function set the PCI_n P2P configurate.
*                 For more information on the P2P read PCI spec.
*
* Inputs:  unsigned int SecondBusLow - Secondery PCI interface Bus Range Lower
*                                      Boundry.
*          unsigned int SecondBusHigh - Secondry PCI interface Bus Range upper
*                                      Boundry.
*          unsigned int busNum - The CPI bus number to which the PCI interface
*                                      is connected.
*          unsigned int devNum - The PCI interface's device number.
*
* Returns:  true.
*********************************************************************/
bool pciP2PConfig (PCI_HOST host, unsigned int SecondBusLow,
		   unsigned int SecondBusHigh,
		   unsigned int busNum, unsigned int devNum)
{
	unsigned int regData;

	regData = (SecondBusLow & 0xff) | ((SecondBusHigh & 0xff) << 8) |
		((busNum & 0xff) << 16) | ((devNum & 0x1f) << 24);
	GT_REG_WRITE (pci_p2p_configuration[host], regData);
	return true;
}

/********************************************************************
* pciSetRegionSnoopMode - This function modifys one of the 4 regions which
*                          supports Cache Coherency in the PCI_n interface.
* Inputs: region - One of the four regions.
*         snoopType - There is four optional Types:
*                        1. No Snoop.
*                        2. Snoop to WT region.
*                        3. Snoop to WB region.
*                        4. Snoop & Invalidate to WB region.
*         baseAddress - Base Address of this region.
*         regionLength - Region length.
* Returns: false if one of the parameters is wrong otherwise return true.
*********************************************************************/
bool pciSetRegionSnoopMode (PCI_HOST host, PCI_SNOOP_REGION region,
			    PCI_SNOOP_TYPE snoopType,
			    unsigned int baseAddress,
			    unsigned int regionLength)
{
	unsigned int snoopXbaseAddress;
	unsigned int snoopXtopAddress;
	unsigned int data;
	unsigned int snoopHigh = baseAddress + regionLength;

	if ((region > PCI_SNOOP_REGION3) || (snoopType > PCI_SNOOP_WB))
		return false;
	snoopXbaseAddress =
		pci_snoop_control_base_0_low[host] + 0x10 * region;
	snoopXtopAddress = pci_snoop_control_top_0[host] + 0x10 * region;
	if (regionLength == 0) {	/* closing the region */
		GT_REG_WRITE (snoopXbaseAddress, 0x0000ffff);
		GT_REG_WRITE (snoopXtopAddress, 0);
		return true;
	}
	baseAddress = baseAddress & 0xfff00000;	/* Granularity of 1MByte */
	data = (baseAddress >> 20) | snoopType << 12;
	GT_REG_WRITE (snoopXbaseAddress, data);
	snoopHigh = (snoopHigh & 0xfff00000) >> 20;
	GT_REG_WRITE (snoopXtopAddress, snoopHigh - 1);
	return true;
}

static int gt_read_config_dword (struct pci_controller *hose,
				 pci_dev_t dev, int offset, u32 * value)
{
	int bus = PCI_BUS (dev);

	if ((bus == local_buses[0]) || (bus == local_buses[1])) {
		*value = pciReadConfigReg ((PCI_HOST) hose->cfg_addr, offset,
					   PCI_DEV (dev));
	} else {
		*value = pciOverBridgeReadConfigReg ((PCI_HOST) hose->
						     cfg_addr, offset,
						     PCI_DEV (dev), bus);
	}

	return 0;
}

static int gt_write_config_dword (struct pci_controller *hose,
				  pci_dev_t dev, int offset, u32 value)
{
	int bus = PCI_BUS (dev);

	if ((bus == local_buses[0]) || (bus == local_buses[1])) {
		pciWriteConfigReg ((PCI_HOST) hose->cfg_addr, offset,
				   PCI_DEV (dev), value);
	} else {
		pciOverBridgeWriteConfigReg ((PCI_HOST) hose->cfg_addr,
					     offset, PCI_DEV (dev), bus,
					     value);
	}
	return 0;
}


static void gt_setup_ide (struct pci_controller *hose,
			  pci_dev_t dev, struct pci_config_table *entry)
{
	static const int ide_bar[] = { 8, 4, 8, 4, 0, 0 };
	u32 bar_response, bar_value;
	int bar;

	for (bar = 0; bar < 6; bar++) {
		/*ronen different function for 3rd bank. */
		unsigned int offset =
			(bar < 2) ? bar * 8 : 0x100 + (bar - 2) * 8;

		pci_write_config_dword (dev, PCI_BASE_ADDRESS_0 + offset,
					0x0);
		pci_read_config_dword (dev, PCI_BASE_ADDRESS_0 + offset,
				       &bar_response);

		pciauto_region_allocate (bar_response &
					 PCI_BASE_ADDRESS_SPACE_IO ? hose->
					 pci_io : hose->pci_mem, ide_bar[bar],
					 &bar_value);

		pci_write_config_dword (dev, PCI_BASE_ADDRESS_0 + bar * 4,
					bar_value);
	}
}


/* TODO BJW: Change this for DB64360. This was pulled from the EV64260  */
/* and is curently not called *. */
#if 0
static void gt_fixup_irq (struct pci_controller *hose, pci_dev_t dev)
{
	unsigned char pin, irq;

	pci_read_config_byte (dev, PCI_INTERRUPT_PIN, &pin);

	if (pin == 1) {		/* only allow INT A */
		irq = pci_irq_swizzle[(PCI_HOST) hose->
				      cfg_addr][PCI_DEV (dev)];
		if (irq)
			pci_write_config_byte (dev, PCI_INTERRUPT_LINE, irq);
	}
}
#endif

struct pci_config_table gt_config_table[] = {
	{PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE,
	 PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, gt_setup_ide},

	{}
};

struct pci_controller pci0_hose = {
/*    fixup_irq: gt_fixup_irq, */
	config_table:gt_config_table,
};

struct pci_controller pci1_hose = {
/*    fixup_irq: gt_fixup_irq, */
	config_table:gt_config_table,
};

void pci_init_board (void)
{
	unsigned int command;

#ifdef DEBUG
	gt_pci_bus_mode_display (PCI_HOST0);
#endif

	pci0_hose.first_busno = 0;
	pci0_hose.last_busno = 0xff;
	local_buses[0] = pci0_hose.first_busno;

	/* PCI memory space */
	pci_set_region (pci0_hose.regions + 0,
			CFG_PCI0_0_MEM_SPACE,
			CFG_PCI0_0_MEM_SPACE,
			CFG_PCI0_MEM_SIZE, PCI_REGION_MEM);

	/* PCI I/O space */
	pci_set_region (pci0_hose.regions + 1,
			CFG_PCI0_IO_SPACE_PCI,
			CFG_PCI0_IO_SPACE, CFG_PCI0_IO_SIZE, PCI_REGION_IO);

	pci_set_ops (&pci0_hose,
		     pci_hose_read_config_byte_via_dword,
		     pci_hose_read_config_word_via_dword,
		     gt_read_config_dword,
		     pci_hose_write_config_byte_via_dword,
		     pci_hose_write_config_word_via_dword,
		     gt_write_config_dword);
	pci0_hose.region_count = 2;

	pci0_hose.cfg_addr = (unsigned int *) PCI_HOST0;

	pci_register_hose (&pci0_hose);
	pciArbiterEnable (PCI_HOST0);
	pciParkingDisable (PCI_HOST0, 1, 1, 1, 1, 1, 1, 1);
	command = pciReadConfigReg (PCI_HOST0, PCI_COMMAND, SELF);
	command |= PCI_COMMAND_MASTER;
	pciWriteConfigReg (PCI_HOST0, PCI_COMMAND, SELF, command);
	command = pciReadConfigReg (PCI_HOST0, PCI_COMMAND, SELF);
	command |= PCI_COMMAND_MEMORY;
	pciWriteConfigReg (PCI_HOST0, PCI_COMMAND, SELF, command);

	pci0_hose.last_busno = pci_hose_scan (&pci0_hose);

#ifdef DEBUG
	gt_pci_bus_mode_display (PCI_HOST1);
#endif
	pci1_hose.first_busno = pci0_hose.last_busno + 1;
	pci1_hose.last_busno = 0xff;
	pci1_hose.current_busno = pci1_hose.first_busno;
	local_buses[1] = pci1_hose.first_busno;

	/* PCI memory space */
	pci_set_region (pci1_hose.regions + 0,
			CFG_PCI1_0_MEM_SPACE,
			CFG_PCI1_0_MEM_SPACE,
			CFG_PCI1_MEM_SIZE, PCI_REGION_MEM);

	/* PCI I/O space */
	pci_set_region (pci1_hose.regions + 1,
			CFG_PCI1_IO_SPACE_PCI,
			CFG_PCI1_IO_SPACE, CFG_PCI1_IO_SIZE, PCI_REGION_IO);

	pci_set_ops (&pci1_hose,
		     pci_hose_read_config_byte_via_dword,
		     pci_hose_read_config_word_via_dword,
		     gt_read_config_dword,
		     pci_hose_write_config_byte_via_dword,
		     pci_hose_write_config_word_via_dword,
		     gt_write_config_dword);

	pci1_hose.region_count = 2;

	pci1_hose.cfg_addr = (unsigned int *) PCI_HOST1;

	pci_register_hose (&pci1_hose);

	pciArbiterEnable (PCI_HOST1);
	pciParkingDisable (PCI_HOST1, 1, 1, 1, 1, 1, 1, 1);

	command = pciReadConfigReg (PCI_HOST1, PCI_COMMAND, SELF);
	command |= PCI_COMMAND_MASTER;
	pciWriteConfigReg (PCI_HOST1, PCI_COMMAND, SELF, command);

	pci1_hose.last_busno = pci_hose_scan (&pci1_hose);

	command = pciReadConfigReg (PCI_HOST1, PCI_COMMAND, SELF);
	command |= PCI_COMMAND_MEMORY;
	pciWriteConfigReg (PCI_HOST1, PCI_COMMAND, SELF, command);

}