iq80321_pci.c

来自「eCos操作系统源码」· C语言 代码 · 共 192 行

//==========================================================================
//
//      iq80321_pci.c
//
//      HAL support code for IQ80321 PCI
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc.
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// the terms of the GNU General Public License as published by the Free
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
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// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
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// at http://sources.redhat.com/ecos/ecos-license/
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//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    msalter
// Contributors: msalter
// Date:         2002-01-04
// Purpose:      PCI support
// Description:  Implementations of HAL PCI interfaces
//
//####DESCRIPTIONEND####
//
//========================================================================*/

#include <pkgconf/hal.h>
#include <pkgconf/system.h>
#include CYGBLD_HAL_PLATFORM_H
#include CYGHWR_MEMORY_LAYOUT_H

#include <cyg/infra/cyg_type.h>         // base types
#include <cyg/infra/cyg_trac.h>         // tracing macros
#include <cyg/infra/cyg_ass.h>          // assertion macros

#include <cyg/hal/hal_io.h>             // IO macros
#include <cyg/hal/hal_if.h>             // calling interface API
#include <cyg/hal/hal_arch.h>           // Register state info
#include <cyg/hal/hal_diag.h>
#include <cyg/hal/hal_intr.h>           // Interrupt names
#include <cyg/hal/hal_cache.h>
#include <cyg/io/pci_hw.h>
#include <cyg/io/pci.h>

#ifdef CYGPKG_IO_PCI

cyg_uint32 hal_pci_alloc_base_memory;
cyg_uint32 hal_pci_alloc_base_io;
cyg_uint32 hal_pci_physical_memory_base;
cyg_uint32 hal_pci_physical_io_base;
cyg_uint32 hal_pci_inbound_window_base;
cyg_uint32 hal_pci_inbound_window_mask;

//
// Verde ATU Window Usage:
//   Inbound Window 0 - Access to Verde memory mapped registers.
//   Inbound Window 1 - Used to reserve space for outbound window.
//   Inbound Window 2 - Access to SDRAM
//   Inbound Window 3 - Not used.
//
//   Direct Outbound Window - Direct mapped.
//   Outbound Translate Window 0 - Access to Inbound Window 1 PCI space
//   Outbound Translate Window 1 - Unused.
//   Outbound IO Window - Unused.
//


#ifdef CYG_HAL_STARTUP_ROM
#ifdef CYGSEM_HAL_ARM_IQ80321_CLEAR_PCI_RETRY
// state of retry bit in PCSR prior to bit being cleared at sdram scrub time.
extern int hal_pcsr_cfg_retry;

// Wait for BIOS to configure Verde PCI.
// Returns true if BIOS done, false if timeout
bool
cyg_hal_plf_wait_for_bios(void)
{
    int delay = 200;  // 20 seconds, tops

    while (delay-- > 0) {
	if (*ATU_ATUCMD & CYG_PCI_CFG_COMMAND_MEMORY)
	    return true;
	hal_delay_us(100000);
    }
    return false;
}
#endif // CYGSEM_HAL_ARM_IQ80321_CLEAR_PCI_RETRY
#endif // CYG_HAL_STARTUP_ROM

void
cyg_hal_plf_pci_init(void)
{
    cyg_uint32 dram_limit = (0xFFFFFFFF - (hal_dram_size - 1)) & 0xFFFFFFC0;

    // Enable NIC through GPIO pin. This may not have an effect depending
    // on switch settings.
    *GPIO_GPOE &= ~(1 << IQ80321_GBE_GPIO_PIN);
    *GPIO_GPOD |= (1 << IQ80321_GBE_GPIO_PIN);

    hal_pci_inbound_window_mask = ~dram_limit;

    // Force BAR0 to be non-prefetchable to allow proper MU usage
    *ATU_IABAR0 &= ~CYG_PRI_CFG_BAR_MEM_PREFETCH;

#ifdef CYG_HAL_STARTUP_ROM
#ifdef CYGSEM_HAL_ARM_IQ80321_CLEAR_PCI_RETRY
    if (!hal_pcsr_cfg_retry || !cyg_hal_plf_wait_for_bios())
#endif  // CYGSEM_HAL_ARM_IQ80321_CLEAR_PCI_RETRY
    {
	// 64-bit prefetchable
	*ATU_IABAR2 = SDRAM_PHYS_BASE | \
                      CYG_PRI_CFG_BAR_MEM_TYPE_64 | \
                      CYG_PRI_CFG_BAR_MEM_PREFETCH;
	*ATU_IAUBAR2 = 0;

	// Outbound window will be set based on the memory reserved
        // by inbound window 1
	*ATU_IABAR1 = _PCI_MEM_BASE | \
	              CYG_PRI_CFG_BAR_MEM_TYPE_64 | \
                      CYG_PRI_CFG_BAR_MEM_PREFETCH;

    }
#endif  // CYG_HAL_STARTUP_ROM

    // allow ATU to act as a bus master, respond to PCI memory accesses,
    // and assert S_SERR#
    *ATU_ATUCMD = (CYG_PCI_CFG_COMMAND_SERR   | \
		   CYG_PCI_CFG_COMMAND_PARITY | \
		   CYG_PCI_CFG_COMMAND_MASTER | \
		   CYG_PCI_CFG_COMMAND_MEMORY);

    hal_pci_alloc_base_memory = *ATU_IABAR1 & CYG_PRI_CFG_BAR_MEM_MASK;
    hal_pci_alloc_base_io = _PCI_IO_BASE;

    hal_pci_inbound_window_base = *ATU_IABAR2 & CYG_PRI_CFG_BAR_MEM_MASK;


    // set the outbound window PCI address
    *ATU_OMWTVR0 = hal_pci_alloc_base_memory;
    *ATU_OUMWTVR0 = 0;

    // outbound I/O window
    *ATU_OIOWTVR = hal_pci_alloc_base_io;

    hal_pci_physical_memory_base = _PCI_MEM_BASE - hal_pci_alloc_base_memory;
    hal_pci_physical_io_base     = _PCI_IO_BASE - hal_pci_alloc_base_io;

#ifdef CYG_HAL_MEMORY_MAP_NORMAL
    // Adjust for Virt - Phys in CPU space
    hal_pci_physical_memory_base += 0x20000000;
    hal_pci_physical_io_base     += 0x20000000;
#endif

    cyg_pci_set_memory_base(HAL_PCI_ALLOC_BASE_MEMORY);
    cyg_pci_set_io_base(HAL_PCI_ALLOC_BASE_IO);

    // enable outbound ATU
    *ATU_ATUCR = 2;

    *ATU_APMCSR = 3;
}

#endif // CYGPKG_IO_PCI