diff options
Diffstat (limited to 'cpu/mpc824x/drivers/dma/dma1.c')
| -rw-r--r-- | cpu/mpc824x/drivers/dma/dma1.c | 801 |
1 files changed, 801 insertions, 0 deletions
diff --git a/cpu/mpc824x/drivers/dma/dma1.c b/cpu/mpc824x/drivers/dma/dma1.c new file mode 100644 index 0000000..8c3834e --- /dev/null +++ b/cpu/mpc824x/drivers/dma/dma1.c @@ -0,0 +1,801 @@ +/************************************************************ + * + * copyright @ Motorola, 1999 + * + * App. API + * + * App. API are the APIs Kernel provides for the application + * level program + * + ************************************************************/ +#include "dma_export.h" +#include "dma.h" + +/* Define a macro to use an optional application-layer print function, if + * one was passed to the library during initialization. If there was no + * function pointer passed, this protects against referencing a NULL pointer. + * Also define The global variable that holds the passed pointer. + */ +#define PRINT if ( app_print ) app_print +static int (*app_print)(char *,...); + +/* Set by call to get_eumbbar during DMA_Initialize. + * This could be globally available to the library, but there is + * an advantage to passing it as a parameter: it is already in a register + * and doesn't have to be loaded from memory. Also, that is the way the + * library was already implemented and I don't want to change it without + * a more detailed analysis. + * It is being set as a global variable during initialization to hide it from + * the DINK application layer, because it is Kahlua-specific. I think that + * get_eumbbar, load_runtime_reg, and store_runtime_reg should be defined in + * a Kahlua-specific library dealing with the embedded utilities memory block. + * Right now, get_eumbbar is defined in dink32/kahlua.s. The other two are + * defined in dink32/drivers/i2c/i2c2.s, drivers/dma/dma2.s, etc. + */ +static unsigned int Global_eumbbar = 0; +extern unsigned int get_eumbbar(); + + +extern unsigned int load_runtime_reg( unsigned int eumbbar, unsigned int reg ); +#pragma Alias( load_runtime_reg, "load_runtime_reg" ); + +extern void store_runtime_reg( unsigned int eumbbar, unsigned int reg, unsigned int val ); +#pragma Alias( store_runtime_reg, "store_runtime_reg" ); + +unsigned int dma_reg_tb[][14] = { + /* local DMA registers */ + { + /* DMA_0_MR */ 0x00001100, + /* DMA_0_SR */ 0x00001104, + /* DMA_0_CDAR */ 0x00001108, + /* DMA_0_SAR */ 0x00001110, + /* DMA_0_DAR */ 0x00001118, + /* DMA_0_BCR */ 0x00001120, + /* DMA_0_NDAR */ 0x00001124, + /* DMA_1_MR */ 0x00001200, + /* DMA_1_SR */ 0x00001204, + /* DMA_1_CDAR */ 0x00001208, + /* DMA_1_SAR */ 0x00001210, + /* DMA_1_DAR */ 0x00001218, + /* DMA_1_BCR */ 0x00001220, + /* DMA_1_NDAR */ 0x00001224, + }, + /* remote DMA registers */ + { + /* DMA_0_MR */ 0x00000100, + /* DMA_0_SR */ 0x00000104, + /* DMA_0_CDAR */ 0x00000108, + /* DMA_0_SAR */ 0x00000110, + /* DMA_0_DAR */ 0x00000118, + /* DMA_0_BCR */ 0x00000120, + /* DMA_0_NDAR */ 0x00000124, + /* DMA_1_MR */ 0x00000200, + /* DMA_1_SR */ 0x00000204, + /* DMA_1_CDAR */ 0x00000208, + /* DMA_1_SAR */ 0x00000210, + /* DMA_1_DAR */ 0x00000218, + /* DMA_1_BCR */ 0x00000220, + /* DMA_1_NDAR */ 0x00000224, + }, +}; + +/* API functions */ + +/* Initialize DMA unit with the following: + * optional pointer to application layer print function + * + * These parameters may be added: + * ??? + * Interrupt enables, modes, etc. are set for each transfer. + * + * This function must be called before DMA unit can be used. + */ +extern +DMA_Status DMA_Initialize( int (*p)(char *,...)) +{ + DMAStatus status; + /* establish the pointer, if there is one, to the application's "printf" */ + app_print = p; + + /* If this is the first call, get the embedded utilities memory block + * base address. I'm not sure what to do about error handling here: + * if a non-zero value is returned, accept it. + */ + if ( Global_eumbbar == 0) + Global_eumbbar = get_eumbbar(); + if ( Global_eumbbar == 0) + { + PRINT( "DMA_Initialize: can't find EUMBBAR\n" ); + return DMA_ERROR; + } + + return DMA_SUCCESS; +} + + +/* Perform the DMA transfer, only direct mode is currently implemented. + * At this point, I think it would be better to define a different + * function for chaining mode. + * Also, I'm not sure if it is appropriate to have the "generic" API + * accept snoop and int_steer parameters. The DINK user interface allows + * them, so for now I'll leave them. + * + * int_steer controls DMA interrupt steering to PCI or local processor + * type is the type of transfer: M2M, M2P, P2M, P2P + * source is the source address of the data + * dest is the destination address of the data + * len is the length of data to transfer + * channel is the DMA channel to use for the transfer + * snoop is the snoop enable control + */ +extern DMA_Status DMA_direct_transfer( DMA_INTERRUPT_STEER int_steer, + DMA_TRANSFER_TYPE type, + unsigned int source, + unsigned int dest, + unsigned int len, + DMA_CHANNEL channel, + DMA_SNOOP_MODE snoop) +{ + DMA_MR md; + DMA_CDAR cdar; + /* it's inappropriate for curr to be a struct, but I'll leave it */ + DMA_CURR curr; + + DMAStatus stat; + + /* The rest of this code was moved from device.c test_dma to here. + * It needs to be cleaned up and validated, but at least it is removed + * from the application and API. Most of the mode is left hard coded. + * This should be changed after the final API is defined and the user + * application has a way to control the transfer. + * + */ + + if ( DMA_Get_Mode( LOCAL, Global_eumbbar, channel, &md ) != DMASUCCESS ) + { + return DMA_ERROR; + } + + md.irqs = int_steer; + md.pde = 0; + md.dahts = 3; /* 8 - byte */ + md.sahts = 3; /* 8 - byte */ + md.dahe = 0; + md.sahe = 0; + md.prc = 0; + /* if steering interrupts to local processor, use polling mode */ + if ( int_steer == DMA_INT_STEER_PCI ) + { + md.eie = 1; + md.eotie = 1; + } else { + md.eie = 0; + md.eotie = 0; + } + md.dl = 0; + md.ctm = 1; /* direct mode */ + md.cc = 0; + + /* validate the length range */ + if (len > 0x3ffffff ) + { + PRINT( "dev DMA: length of transfer too large: %d\n", len ); + return DMA_ERROR; + } + + /* inappropriate to use a struct, but leave as is for now */ + curr.src_addr = source; + curr.dest_addr = dest; + curr.byte_cnt = len; + + (void)DMA_Poke_Desp( LOCAL, Global_eumbbar, channel, &cdar ); + cdar.snen = snoop; + cdar.ctt = type; + + if ( ( stat = DMA_Bld_Desp( LOCAL, Global_eumbbar, channel, cdar )) + != DMASUCCESS || + ( stat = DMA_Bld_Curr( LOCAL, Global_eumbbar, channel, curr )) + != DMASUCCESS || + ( stat = DMA_Set_Mode( LOCAL, Global_eumbbar, channel, md )) + != DMASUCCESS || + ( stat = DMA_Start( LOCAL, Global_eumbbar, channel )) + != DMASUCCESS ) + { + if ( stat == DMACHNBUSY ) + { + PRINT( "dev DMA: channel %d busy.\n", channel ); + } + else + { + PRINT( "dev DMA: invalid channel request.\n", channel ); + } + + return DMA_ERROR; + } + +/* Since we are interested at the DMA performace right now, + we are going to do as less as possible to burden the + 603e core. + + if you have epic enabled or don't care the return from + DMA operation, you can just return SUCCESS. + + if you don't have epic enabled and care the DMA result, + you can use the polling method below. + + Note: I'll attempt to activate the code for handling polling. + */ + +#if 0 + /* if steering interrupt to local processor, let it handle results */ + if ( int_steer == DMA_INT_STEER_LOCAL ) + { + return DMA_SUCCESS; + } + + /* polling since interrupt goes to PCI */ + do + { + stat = DMA_ISR( Global_eumbbar, channel, dma_error_func, + dma_error_func, dma_error_func, dma_error_func ); + } + while ( stat == DMANOEVENT ); +#endif + + return DMA_SUCCESS; +} + +/* DMA library internal functions */ + +/** + * Note: + * + * In all following functions, the host (KAHLUA) processor has a + * choice of accessing on board local DMA (LOCAL), + * or DMA on a distributed KAHLUA (REMOTE). In either case, + * the caller shall pass the configured embedded utility memory + * block base address relative to the DMA. If LOCAL DMA is used, + * this parameter shall be EUMBBAR, if REMOTE is used, the + * parameter shall be the corresponding PCSRBAR. + **/ + +/************************************************************** + * function: DMA_Get_Stat + * + * description: return the content of status register of + * the given DMA channel + * + * if error, reserved0 field all 1s. + **************************************************************/ +static +DMAStatus DMA_Get_Stat( LOCATION host, unsigned int eumbbar, unsigned int channel, DMA_SR *stat ) +{ + unsigned int tmp; + + if ( channel != 0 && channel != 1 || stat == 0 ) + { + return DMAINVALID; + } + + tmp = load_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_SR_REG] ); +#ifdef DMADBG0 + PRINT( "%s(%d): %s DMA %d (0x%08x) stat = 0x%08x\n", __FILE__, __LINE__, + ( host == LOCAL ? "local" : "remote" ), channel, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_SR_REG], tmp ); +#endif + + stat->reserved0 = ( tmp & 0xffffff00 ) >> 8; + stat->lme = ( tmp & 0x00000080 ) >> 7; + stat->reserved1 = ( tmp & 0x00000060 ) >> 5; + stat->pe = ( tmp & 0x00000010 ) >> 4; + stat->reserved2 = ( tmp & 0x00000008 ) >> 3; + stat->cb = ( tmp & 0x00000004 ) >> 2; + stat->eosi = ( tmp & 0x00000002 ) >> 1; + stat->eocai = ( tmp & 0x00000001 ); + + return DMASUCCESS; +} + +/************************************************************** + * function: DMA_Get_Mode + * + * description: return the content of mode register of the + * given DMA channel + * + * if error, return DMAINVALID, otherwise return + * DMASUCCESS + **************************************************************/ +static +DMAStatus DMA_Get_Mode( LOCATION host, unsigned eumbbar, unsigned int channel, DMA_MR *mode ) +{ + unsigned int tmp; + if ( channel != 0 && channel != 1 || mode == 0 ) + { + return DMAINVALID; + } + + tmp = load_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_MR_REG] ); + +#ifdef DMADBG0 + PRINT( "%s(%d): %s DMA %d (0x%08x) mode = 0x%08x\n", __FILE__, __LINE__, + ( host == LOCAL ? "local" : "remote" ), channel, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_MR_REG], tmp ); +#endif + + mode->reserved0 = (tmp & 0xfff00000) >> 20; + mode->irqs = (tmp & 0x00080000) >> 19; + mode->pde = (tmp & 0x00040000) >> 18; + mode->dahts = (tmp & 0x00030000) >> 16; + mode->sahts = (tmp & 0x0000c000) >> 14; + mode->dahe = (tmp & 0x00002000) >> 13; + mode->sahe = (tmp & 0x00001000) >> 12; + mode->prc = (tmp & 0x00000c00) >> 10; + mode->reserved1 = (tmp & 0x00000200) >> 9; + mode->eie = (tmp & 0x00000100) >> 8; + mode->eotie = (tmp & 0x00000080) >> 7; + mode->reserved2 = (tmp & 0x00000070) >> 4; + mode->dl = (tmp & 0x00000008) >> 3; + mode->ctm = (tmp & 0x00000004) >> 2; + mode->cc = (tmp & 0x00000002) >> 1; + mode->cs = (tmp & 0x00000001); + + return DMASUCCESS; +} + +/************************************************************** + * function: DMA_Set_Mode + * + * description: Set a new mode to a given DMA channel + * + * note: It is not a good idea of changing the DMA mode during + * the middle of a transaction. + **************************************************************/ +static +DMAStatus DMA_Set_Mode( LOCATION host, unsigned eumbbar, unsigned int channel, DMA_MR mode ) +{ + unsigned int tmp; + if ( channel != 0 && channel != 1 ) + { + return DMAINVALID; + } + + tmp = ( mode.reserved0 & 0xfff ) << 20; + tmp |= ( ( mode.irqs & 0x1 ) << 19); + tmp |= ( ( mode.pde & 0x1 ) << 18 ); + tmp |= ( ( mode.dahts & 0x3 ) << 16 ); + tmp |= ( ( mode.sahts & 0x3 ) << 14 ); + tmp |= ( ( mode.dahe & 0x1 ) << 13 ); + tmp |= ( ( mode.sahe & 0x1 ) << 12 ); + tmp |= ( ( mode.prc & 0x3 ) << 10 ); + tmp |= ( ( mode.reserved1 & 0x1 ) << 9 ); + tmp |= ( ( mode.eie & 0x1 ) << 8 ); + tmp |= ( ( mode.eotie & 0x1 ) << 7 ); + tmp |= ( ( mode.reserved2 & 0x7 ) << 4 ); + tmp |= ( ( mode.dl & 0x1 ) << 3 ); + tmp |= ( ( mode.ctm & 0x1 ) << 2 ); + tmp |= ( ( mode.cc & 0x1 ) << 1 ) ; + tmp |= ( mode.cs & 0x1 ); + + store_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG + DMA_MR_REG], tmp ); + return DMASUCCESS; +} + +/************************************************************ + * function: DMA_Start + * + * description: start a given DMA channel transaction + * return DMASUCCESS if success otherwise return + * DMAStatus value + * + * note: this function will clear DMA_MR(CC) first, then + * set DMA_MR(CC). + ***********************************************************/ +static +DMAStatus DMA_Start( LOCATION host, unsigned int eumbbar, unsigned int channel ) +{ + DMA_SR stat; + unsigned int mode; + + if ( channel != 0 && channel != 1 ) + { + return DMAINVALID; + } + + if ( DMA_Get_Stat( host, eumbbar, channel, &stat ) != DMASUCCESS ) + { + return DMAINVALID; + } + + if ( stat.cb == 1 ) + { + /* DMA is not free */ + return DMACHNBUSY; + } + + mode = load_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG + DMA_MR_REG] ); + /* clear DMA_MR(CS) */ + mode &= 0xfffffffe; + store_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG + DMA_MR_REG], mode ); + + /* set DMA_MR(CS) */ + mode |= CS; + store_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG + DMA_MR_REG], mode ); + return DMASUCCESS; +} + +/*********************************************************** + * function: DMA_Halt + * + * description: halt the current dma transaction on the specified + * channel. + * return DMASUCCESS if success otherwise return DMAINVALID + * + * note: if the specified DMA channel is idle, nothing happens + *************************************************************/ +static +DMAStatus DMA_Halt( LOCATION host, unsigned int eumbbar, unsigned int channel ) +{ + unsigned int mode; + if ( channel != 0 && channel != 1 ) + { + return DMAINVALID; + } + + mode = load_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG + DMA_MR_REG]); + + /* clear DMA_MR(CS) */ + mode &= 0xfffffffe; + store_runtime_reg(eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG + DMA_MR_REG], mode ); + return DMASUCCESS; +} + +/************************************************************* + * function: DMA_Chn_Cnt + * + * description: set the DMA_MR(CC) bit for a given channel + * that is in chaining mode. + * return DMASUCCESS if successfule, otherwise return + * DMAINVALID. + * + * note: if the given channel is not in chaining mode, nothing + * happen. + * + *************************************************************/ +static +DMAStatus DMA_Chn_Cnt( LOCATION host, unsigned int eumbbar, unsigned int channel ) +{ + DMA_MR mode; + if ( channel != 0 && channel != 1 ) + { + return DMAINVALID; + } + + if ( DMA_Get_Mode( host, eumbbar, channel, &mode ) != DMASUCCESS ) + { + return DMAINVALID; + } + + if ( mode.ctm == 0 ) + { + /* either illegal mode or not chaining mode */ + return DMAINVALID; + } + + mode.cc = 1; + return DMA_Set_Mode( host, eumbbar, channel, mode ); +} + +/************************************************************** + * function: DMA_Bld_Desp + * + * description: set current descriptor address register + * according to the desp for a given channel + * + * if the given channel is busy return DMACHNBUSY + * and no change made, otherwise return DMASUCCESS. + * + * note: + **************************************************************/ +static +DMAStatus DMA_Bld_Desp( LOCATION host, + unsigned int eumbbar, + unsigned int channel, + DMA_CDAR desp ) +{ + DMA_SR status; + unsigned int temp; + + if ( channel != 0 && channel != 1 ) + { + /* channel number out of range */ + return DMAINVALID; + } + + if ( DMA_Get_Stat( host, eumbbar, channel, &status ) != DMASUCCESS ) + { + return DMAINVALID; + } + + if ( status.cb == 1 ) + { + /* channel busy */ + return DMACHNBUSY; + } + + temp = ( desp.cda & 0x7ffffff ) << 5; + temp |= (( desp.snen & 0x1 ) << 4 ); + temp |= (( desp.eosie & 0x1 ) << 3 ); + temp |= (( desp.ctt & 0x3 ) << 1 ); + temp |= ( desp.eotd & 0x1 ); + + store_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_CDAR_REG], temp ); + +#ifdef DMADBG0 + PRINT( "%s(%d): %s DMA %d (0x%08x) cdar := 0x%08x\n", __FILE__, __LINE__, + ( host == LOCAL ? "local" : "remote" ), channel, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_CDAR_REG], temp ); +#endif + + return DMASUCCESS; +} + +/************************************************************** + * function: DMA_Poke_Desp + * + * description: poke the current descriptor address register + * for a given channel + * + * return DMASUCCESS if no error + * + * note: Due to the undeterministic parallellism of DMA operation, + * the value returned by this function shall be taken as + * the most recently used descriptor when the last time + * DMA starts a chaining mode operation. + **************************************************************/ +static +DMAStatus DMA_Poke_Desp( LOCATION host, + unsigned int eumbbar, + unsigned int channel, + DMA_CDAR *desp ) +{ + unsigned int cdar; + if ( channel != 0 && channel != 1 || desp == 0 ) + { + return DMAINVALID; + } + + cdar = load_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_CDAR_REG] ); + +#ifdef DMADBG0 + PRINT( "%s(%d): %s DMA %d (0x%08x) cdar : 0x%08x\n", __FILE__, __LINE__, + ( host == LOCAL ? "local" : "remote" ), channel, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_CDAR_REG], cdar ); +#endif + + + desp->cda = ( cdar & 0xffffffe0 ) >> 5; + desp->snen = ( cdar & 0x00000010 ) >> 4; + desp->eosie = ( cdar & 0x00000008 ) >> 3; + desp->ctt = ( cdar & 0x00000006 ) >> 1; + desp->eotd = ( cdar & 0x00000001 ); + + return DMASUCCESS; +} + +/************************************************************** + * function: DMA_Bld_Curr + * + * description: set current src, dest, byte count registers + * according to the desp for a given channel + * return DMASUCCESS if no error. + * + * note: + **************************************************************/ +static +DMAStatus DMA_Bld_Curr( LOCATION host, + unsigned int eumbbar, + unsigned int channel, + DMA_CURR desp ) +{ + DMA_SR status; + if ( channel != 0 && channel != 1 ) + { + /* channel number out of range */ + return DMAINVALID; + } + + if ( DMA_Get_Stat( host, eumbbar, channel, &status ) != DMASUCCESS ) + { + return DMAINVALID; + } + + if ( status.cb == 1 ) + { + /* channel busy */ + return DMACHNBUSY; + } + + desp.byte_cnt &= 0x03ffffff; /* upper 6-bits are 0s */ + + store_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_SAR_REG], desp.src_addr ); +#ifdef DMADBG0 + PRINT( "%s(%d): %s DMA %d (0x%08x) src := 0x%08x\n", __FILE__, __LINE__, + ( host == LOCAL ? "local" : "remote" ), channel, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_CDAR_REG], desp.src_addr ); +#endif + + store_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_DAR_REG], desp.dest_addr ); +#ifdef DMADBG0 + PRINT( "%s(%d): %s DMA %d (0x%08x) dest := 0x%08x\n", __FILE__, __LINE__, + ( host == LOCAL ? "local" : "remote" ), channel, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_CDAR_REG], desp.dest_addr ); +#endif + + store_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_BCR_REG], desp.byte_cnt ); +#ifdef DMADBG0 + PRINT( "%s(%d): %s DMA %d (0x%08x) count := 0x%08x\n", __FILE__, __LINE__, + ( host == LOCAL ? "local" : "remote" ), channel, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_CDAR_REG], desp.byte_cnt ); +#endif + + + return DMASUCCESS; + +} + +/************************************************************** + * function: DMA_Poke_Curr + * + * description: poke the current src, dest, byte count registers + * for a given channel. + * + * return DMASUCCESS if no error + * + * note: Due to the undeterministic parallelism, in chaining + * mode, the value returned by this function shall + * be taken as reference when the query is made rather + * than the absolute snapshot when the value is returned. + **************************************************************/ +static +DMAStatus DMA_Poke_Curr( LOCATION host, + unsigned int eumbbar, + unsigned int channel, + DMA_CURR* desp ) +{ + if ( channel != 0 && channel != 1 || desp == 0 ) + { + return DMAINVALID; + } + + desp->src_addr = load_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_SAR_REG] ); +#ifdef DMADBG0 + PRINT( "%s(%d): %s DMA %d (0x%08x) src : 0x%08x\n", __FILE__, __LINE__, + ( host == LOCAL ? "local" : "remote" ), channel, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_CDAR_REG], desp->src_addr ); +#endif + + desp->dest_addr = load_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_DAR_REG] ); +#ifdef DMADBG0 + PRINT( "%s(%d): %s DMA %d (0x%08x) dest : 0x%08x\n", __FILE__, __LINE__, + ( host == LOCAL ? "local" : "remote" ), channel, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_CDAR_REG], desp->dest_addr ); +#endif + + desp->byte_cnt = load_runtime_reg( eumbbar, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_BCR_REG] ); +#ifdef DMADBG0 + PRINT( "%s(%d): %s DMA %d (0x%08x) count : 0x%08x\n", __FILE__, __LINE__, + ( host == LOCAL ? "local" : "remote" ), channel, dma_reg_tb[host][channel*NUM_DMA_REG+DMA_CDAR_REG], desp->byte_cnt ); +#endif + + + return DMASUCCESS; +} + +/***************************************************************** + * function: dma_error_func + * + * description: display the error information + * + * note: This seems like a highly convoluted way to handle messages, + * but I'll leave it as it was in device.c when I moved it into the + * DMA library source. + ****************************************************************/ +static +DMAStatus dma_error_func( unsigned int eumbbar, unsigned int chn, DMAStatus err) +{ + unsigned char *msg[] = + { + "Local Memory Error", + "PCI Error", + "Channel Busy", + "End-of-Segment Interrupt", + "End-of-Chain/Direct Interrupt", + }; + + if ( err >= DMALMERROR && err <= DMAEOCAINT ) + { + PRINT( "DMA Status: channel %d %s\n", chn, msg[err-DMASUCCESS-1] ); + } + + return err; + +} + +/************************************************************* + * function: DMA_ISR + * + * description: DMA interrupt service routine + * return DMAStatus value based on + * the status + * + *************************************************************/ +static +DMAStatus DMA_ISR( unsigned int eumbbar, + unsigned int channel, + DMAStatus (*lme_func)( unsigned int, unsigned int, DMAStatus ), + DMAStatus (*pe_func) ( unsigned int, unsigned int, DMAStatus ), + DMAStatus (*eosi_func)( unsigned int, unsigned int, DMAStatus ), + DMAStatus (*eocai_func)(unsigned int, unsigned int, DMAStatus )) +{ + + DMA_SR stat; + DMAStatus rval = DMANOEVENT; + unsigned int temp; + + if ( channel != 0 && channel != 1 ) + { + return DMAINVALID; + } + + if ( DMA_Get_Stat( LOCAL, eumbbar, channel, &stat ) != DMASUCCESS ) + { + return DMAINVALID; + } + + if ( stat.lme == 1 ) + { + /* local memory error */ + rval = DMALMERROR; + if ( lme_func != 0 ) + { + rval = (*lme_func)(eumbbar, channel, DMALMERROR ); + } + + } + else if ( stat.pe == 1 ) + { + /* PCI error */ + rval = DMAPERROR; + if ( pe_func != 0 ) + { + rval = (*pe_func)(eumbbar, channel, DMAPERROR ); + } + + } + else if ( stat.eosi == 1 ) + { + /* end-of-segment interrupt */ + rval = DMAEOSINT; + if ( eosi_func != 0 ) + { + rval = (*eosi_func)(eumbbar, channel, DMAEOSINT ); + } + } + else + { + /* End-of-chain/direct interrupt */ + rval = DMAEOCAINT; + if ( eocai_func != 0 ) + { + rval = (*eocai_func)(eumbbar, channel, DMAEOCAINT ); + } + } + + temp = ( stat.reserved0 & 0xffffff ) << 8; + temp |= ( ( stat.lme & 0x1 ) << 7 ); /* write one to clear */ + temp |= ( ( stat.reserved1 & 0x3 ) << 5 ); + temp |= ( ( stat.pe & 0x1 ) << 4 ); /* write one to clear */ + temp |= ( ( stat.reserved2 & 0x1 ) << 3 ); + temp |= ( ( stat.cb & 0x1 ) << 2 ); /* write one to clear */ + temp |= ( ( stat.eosi & 0x1 ) << 1 ); /* write one to clear */ + temp |= ( stat.eocai & 0x1 ); /* write one to clear */ + + store_runtime_reg( eumbbar, dma_reg_tb[LOCAL][channel*NUM_DMA_REG + DMA_SR_REG], temp ); + +#ifdef DMADBG0 + PRINT( "%s(%d): DMA channel %d SR := 0x%08x\n", __FILE__, __LINE__, channel, temp ); +#endif + + return rval; +} |