Using seperate function calls for each bit-bang of slave serial load can be painfully slow. This patch adds the possibility to supply a block write function that loads the complete block of data in one call (like it can already be done with Altera FPGAs). On an MCF5373L (240 MHz) loading an XC3S4000 this reduces the load time from around 15 seconds to around 3 seconds
Signed-off-by: Wolfgang Wegner w.wegner@astro-kom.de --- drivers/fpga/spartan3.c | 54 +++++++++++++++++++++++++--------------------- include/spartan3.h | 1 + include/xilinx.h | 1 + 3 files changed, 31 insertions(+), 25 deletions(-)
diff --git a/drivers/fpga/spartan3.c b/drivers/fpga/spartan3.c index 0fe3041..7a89b56 100644 --- a/drivers/fpga/spartan3.c +++ b/drivers/fpga/spartan3.c @@ -385,34 +385,38 @@ static int Spartan3_ss_load (Xilinx_desc * desc, void *buf, size_t bsize) } while ((*fn->init) (cookie));
/* Load the data */ - while (bytecount < bsize) { - - /* Xilinx detects an error if INIT goes low (active) - while DONE is low (inactive) */ - if ((*fn->done) (cookie) == 0 && (*fn->init) (cookie)) { - puts ("** CRC error during FPGA load.\n"); - return (FPGA_FAIL); - } - val = data [bytecount ++]; - i = 8; - do { - /* Deassert the clock */ - (*fn->clk) (FALSE, TRUE, cookie); - CONFIG_FPGA_DELAY (); - /* Write data */ - (*fn->wr) ((val & 0x80), TRUE, cookie); - CONFIG_FPGA_DELAY (); - /* Assert the clock */ - (*fn->clk) (TRUE, TRUE, cookie); - CONFIG_FPGA_DELAY (); - val <<= 1; - i --; - } while (i > 0); + if(*fn->bwr) + (*fn->bwr) (data, bsize, TRUE, cookie); + else { + while (bytecount < bsize) { + + /* Xilinx detects an error if INIT goes low (active) + while DONE is low (inactive) */ + if ((*fn->done) (cookie) == 0 && (*fn->init) (cookie)) { + puts ("** CRC error during FPGA load.\n"); + return (FPGA_FAIL); + } + val = data [bytecount ++]; + i = 8; + do { + /* Deassert the clock */ + (*fn->clk) (FALSE, TRUE, cookie); + CONFIG_FPGA_DELAY (); + /* Write data */ + (*fn->wr) ((val & 0x80), TRUE, cookie); + CONFIG_FPGA_DELAY (); + /* Assert the clock */ + (*fn->clk) (TRUE, TRUE, cookie); + CONFIG_FPGA_DELAY (); + val <<= 1; + i --; + } while (i > 0);
#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK - if (bytecount % (bsize / 40) == 0) - putc ('.'); /* let them know we are alive */ + if (bytecount % (bsize / 40) == 0) + putc ('.'); /* let them know we are alive */ #endif + } }
CONFIG_FPGA_DELAY (); diff --git a/include/spartan3.h b/include/spartan3.h index 30b1c2d..d5a589d 100644 --- a/include/spartan3.h +++ b/include/spartan3.h @@ -57,6 +57,7 @@ typedef struct { Xilinx_done_fn done; Xilinx_wr_fn wr; Xilinx_post_fn post; + Xilinx_bwr_fn bwr; /* block write function */ } Xilinx_Spartan3_Slave_Serial_fns;
/* Device Image Sizes diff --git a/include/xilinx.h b/include/xilinx.h index d0799bc..2cb2e5b 100644 --- a/include/xilinx.h +++ b/include/xilinx.h @@ -100,5 +100,6 @@ typedef int (*Xilinx_busy_fn)( int cookie ); typedef int (*Xilinx_abort_fn)( int cookie ); typedef int (*Xilinx_pre_fn)( int cookie ); typedef int (*Xilinx_post_fn)( int cookie ); +typedef int (*Xilinx_bwr_fn)( void *buf, size_t len, int flush, int cookie );
#endif /* _XILINX_H_ */