atm.c

u-boot-1.1.6 源码包

#include <common.h>
#include <mpc8xx.h>
#include <commproc.h>

#include "atm.h"
#include <linux/stddef.h>

#define SYNC __asm__("sync")
#define ALIGN(p, a) ((char *)(((uint32)(p)+(a)-1) & ~((uint32)(a)-1)))

#define FALSE  1
#define TRUE   0
#define OK     0
#define ERROR -1

struct atm_connection_t g_conn[NUM_CONNECTIONS] =
{
  { NULL, 10, NULL, 10,  NULL, NULL, NULL, NULL }, /* OAM  */
};

struct atm_driver_t g_atm =
{
  FALSE,   /* loaded */
  FALSE,   /* started */
  NULL,    /* csram */
  0,       /* csram_size */
  NULL,    /* am_top */
  NULL,    /* ap_top */
  NULL,    /* int_reload_ptr */
  NULL,    /* int_serv_ptr */
  NULL,    /* rbd_base_ptr */
  NULL,    /* tbd_base_ptr */
  0        /* linerate */
};

char csram[1024]; /* more than enough for doing nothing*/

int    atmLoad(void);
void   atmUnload(void);
int    atmMemInit(void);
void   atmIntInit(void);
void   atmApcInit(void);
void   atmAmtInit(void);
void   atmCpmInit(void);
void   atmUtpInit(void);

/*****************************************************************************
 *
 * FUNCTION NAME: atmLoad
 *
 * DESCRIPTION: Basic ATM initialization.
 *
 * PARAMETERS: none
 *
 * RETURNS: OK or ERROR
 *
 ****************************************************************************/
int atmLoad()
{
  volatile immap_t       *immap  = (immap_t *)CFG_IMMR;
  volatile cpmtimer8xx_t *timers = &immap->im_cpmtimer;
  volatile iop8xx_t      *iop    = &immap->im_ioport;

  timers->cpmt_tgcr &=  0x0FFF; SYNC;             /* Disable Timer 4 */
  immap->im_cpm.cp_scc[4].scc_gsmrl = 0x0; SYNC; /* Disable SCC4 */
  iop->iop_pdpar &= 0x3FFF; SYNC;                 /* Disable SAR and UTOPIA */

  if ( atmMemInit() != OK ) return ERROR;

  atmIntInit();
  atmApcInit();
  atmAmtInit();
  atmCpmInit();
  atmUtpInit();

  g_atm.loaded = TRUE;

  return OK;
}

/*****************************************************************************
 *
 * FUNCTION NAME: atmUnload
 *
 * DESCRIPTION: Disables ATM and UTOPIA.
 *
 * PARAMETERS: none
 *
 * RETURNS: void
 *
 ****************************************************************************/
void atmUnload()
{
  volatile immap_t       *immap  = (immap_t *)CFG_IMMR;
  volatile cpmtimer8xx_t *timers = &immap->im_cpmtimer;
  volatile iop8xx_t      *iop    = &immap->im_ioport;

  timers->cpmt_tgcr &=  0x0FFF; SYNC;             /* Disable Timer 4 */
  immap->im_cpm.cp_scc[4].scc_gsmrl = 0x0; SYNC;  /* Disable SCC4 */
  iop->iop_pdpar &= 0x3FFF; SYNC;                 /* Disable SAR and UTOPIA */
  g_atm.loaded = FALSE;
}

/*****************************************************************************
 *
 * FUNCTION NAME: atmMemInit
 *
 * DESCRIPTION:
 *
 * The ATM driver uses the following resources:
 *
 * A. Memory in DPRAM to hold
 *
 *     1/ CT          = Connection Table ( RCT & TCT )
 *     2/ TCTE        = Transmit Connection Table Extension
 *     3/ MPHYPT      = Multi-PHY Pointing Table
 *     4/ APCP        = APC Parameter Table
 *     5/ APCT_PRIO_1 = APC Table ( priority 1 for AAL1/2 )
 *     6/ APCT_PRIO_2 = APC Table ( priority 2 for VBR )
 *     7/ APCT_PRIO_3 = APC Table ( priority 3 for UBR )
 *     8/ TQ          = Transmit Queue
 *     9/ AM          = Address Matching Table
 *    10/ AP          = Address Pointing Table
 *
 * B. Memory in cache safe RAM to hold
 *
 *     1/ INT         = Interrupt Queue
 *     2/ RBD         = Receive Buffer Descriptors
 *     3/ TBD         = Transmit Buffer Descriptors
 *
 * This function
 * 1. clears the ATM DPRAM area,
 * 2. Allocates and clears cache safe memory,
 * 3. Initializes 'g_conn'.
 *
 * PARAMETERS: none
 *
 * RETURNS: OK or ERROR
 *
 ****************************************************************************/
int atmMemInit()
{
  int i;
  unsigned immr = CFG_IMMR;
  int total_num_rbd = 0;
  int total_num_tbd = 0;

  memset((char *)CFG_IMMR + 0x2000 + ATM_DPRAM_BEGIN, 0x00, ATM_DPRAM_SIZE);

  g_atm.csram_size = NUM_INT_ENTRIES * SIZE_OF_INT_ENTRY;

  for ( i = 0; i < NUM_CONNECTIONS; ++i ) {
    total_num_rbd += g_conn[i].num_rbd;
    total_num_tbd += g_conn[i].num_tbd;
  }

  g_atm.csram_size += total_num_rbd * SIZE_OF_RBD + total_num_tbd * SIZE_OF_TBD + 4;

  g_atm.csram = &csram[0];
  memset(&(g_atm.csram), 0x00, g_atm.csram_size);

  g_atm.int_reload_ptr = (uint32 *)ALIGN(g_atm.csram, 4);
  g_atm.rbd_base_ptr = (struct atm_bd_t *)(g_atm.int_reload_ptr + NUM_INT_ENTRIES);
  g_atm.tbd_base_ptr = (struct atm_bd_t *)(g_atm.rbd_base_ptr + total_num_rbd);

  g_conn[0].rbd_ptr = g_atm.rbd_base_ptr;
  g_conn[0].tbd_ptr = g_atm.tbd_base_ptr;
  g_conn[0].ct_ptr = CT_PTR(immr);
  g_conn[0].tcte_ptr = TCTE_PTR(immr);

  return OK;
}

/*****************************************************************************
 *
 * FUNCTION NAME: atmIntInit
 *
 * DESCRIPTION:
 *
 * Initialization of the MPC860 ESAR Interrupt Queue.
 * This function
 * - clears all entries in the INT,
 * - sets the WRAP bit of the last INT entry,
 * - initializes the 'int_serv_ptr' attribuut of the AtmDriver structure
 *   to the first INT entry.
 *
 * PARAMETERS: none
 *
 * RETURNS: void
 *
 * REMARKS:
 *
 * - The INT resides in external cache safe memory.
 * - The base address of the INT is stored in g_atm.int_reload_ptr.
 * - The number of entries in the INT is given by NUM_INT_ENTRIES.
 * - The INTBASE field in SAR Parameter RAM is set by atmCpmInit().
 *
 ****************************************************************************/
void atmIntInit()
{
  int i;
  for ( i = 0; i < NUM_INT_ENTRIES - 1; ++i) g_atm.int_reload_ptr[i] = 0;
  g_atm.int_reload_ptr[i] = INT_WRAP;
  g_atm.int_serv_ptr = g_atm.int_reload_ptr;
}

/*****************************************************************************
 *
 * FUNCTION NAME: atmApcInit
 *
 * DESCRIPTION:
 *
 * This function initializes the following ATM Pace Controller related
 * data structures:
 *
 * - 1 MPHY Pointing Table (contains only one entry)
 * - 3 APC Parameter Tables (one PHY with 3 priorities)
 * - 3 APC Tables (one table for each priority)
 * - 1 Transmit Queue (one transmit queue per PHY)
 *
 * PARAMETERS: none
 *
 * RETURNS: void
 *
 ****************************************************************************/
void atmApcInit()
{
  int i;
  /* unsigned immr = CFG_IMMR; */
  uint16 * mphypt_ptr = MPHYPT_PTR(CFG_IMMR);
  struct apc_params_t * apcp_ptr = APCP_PTR(CFG_IMMR);
  uint16 * apct_prio1_ptr = APCT1_PTR(CFG_IMMR);
  uint16 * tq_ptr = TQ_PTR(CFG_IMMR);
  /***************************************************/
  /* Initialize MPHY Pointing Table (only one entry) */
  /***************************************************/
  *mphypt_ptr = APCP_BASE;

  /********************************************/
  /* Initialize APC parameters for priority 1 */
  /********************************************/
  apcp_ptr->apct_base1 = APCT_PRIO_1_BASE;
  apcp_ptr->apct_end1  =  APCT_PRIO_1_BASE + NUM_APCT_PRIO_1_ENTRIES * 2;
  apcp_ptr->apct_ptr1  =  APCT_PRIO_1_BASE;
  apcp_ptr->apct_sptr1 = APCT_PRIO_1_BASE;
  apcp_ptr->etqbase    = TQ_BASE;
  apcp_ptr->etqend     =  TQ_BASE + ( NUM_TQ_ENTRIES - 1 ) * 2;
  apcp_ptr->etqaptr    = TQ_BASE;
  apcp_ptr->etqtptr    = TQ_BASE;
  apcp_ptr->apc_mi     = 8;
  apcp_ptr->ncits      = 0x0100;   /* NCITS = 1 */
  apcp_ptr->apcnt      = 0;
  apcp_ptr->reserved1  = 0;
  apcp_ptr->eapcst     = 0x2009;  /* LAST, ESAR, MPHY */
  apcp_ptr->ptp_counter = 0;
  apcp_ptr->ptp_txch   = 0;
  apcp_ptr->reserved2  = 0;


  /***************************************************/
  /* Initialize APC Tables with empty slots (0xFFFF) */
  /***************************************************/
  for ( i = 0; i < NUM_APCT_PRIO_1_ENTRIES; ++i ) *(apct_prio1_ptr++) = 0xFFFF;

  /************************/
  /* Clear Transmit Queue */
  /************************/
  for ( i = 0; i < NUM_TQ_ENTRIES; ++i ) *(tq_ptr++) = 0;
}

/*****************************************************************************
 *
 * FUNCTION NAME: atmAmtInit
 *
 * DESCRIPTION:
 *
 * This function clears the first entry in the Address Matching Table and
 * lets the first entry in the Address Pointing table point to the first
 * entry in the TCT table (i.e. the raw cell channel).
 *
 * PARAMETERS: none
 *
 * RETURNS: void
 *
 * REMARKS:
 *
 * The values for the AMBASE, AMEND and APBASE registers in SAR parameter
 * RAM are initialized by atmCpmInit().
 *
 ****************************************************************************/
void atmAmtInit()
{
  unsigned immr = CFG_IMMR;

  g_atm.am_top = AM_PTR(immr);
  g_atm.ap_top = AP_PTR(immr);

  *(g_atm.ap_top--) = CT_BASE;
  *(g_atm.am_top--) = 0;
}

/*****************************************************************************
 *
 * FUNCTION NAME: atmCpmInit
 *
 * DESCRIPTION:
 *
 * This function initializes the Utopia Interface Parameter RAM Map
 * (SCC4, ATM Protocol) of the Communication Processor Modudule.
 *
 * PARAMETERS: none
 *
 * RETURNS: void
 *
 ****************************************************************************/
void atmCpmInit()
{
  unsigned immr = CFG_IMMR;

  memset((char *)immr + 0x3F00, 0x00, 0xC0);

  /*-----------------------------------------------------------------*/
  /* RBDBASE - Receive buffer descriptors base address               */
  /* The RBDs reside in cache safe external memory.                  */
  /*-----------------------------------------------------------------*/
  *RBDBASE(immr) = (uint32)g_atm.rbd_base_ptr;