u-boot/board/gen860t/fpga.c

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/*
* (C) Copyright 2002
* Rich Ireland, Enterasys Networks, rireland@enterasys.com.
* Keith Outwater, keith_outwater@mvis.com.
*
* SPDX-License-Identifier: GPL-2.0+
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*/
/*
* Virtex2 FPGA configuration support for the GEN860T computer
*/
#include <common.h>
#include <virtex2.h>
#include <command.h>
#include "fpga.h"
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_FPGA)
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#if 0
#define GEN860T_FPGA_DEBUG
#endif
#ifdef GEN860T_FPGA_DEBUG
#define PRINTF(fmt,args...) printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif
/*
* Port bit numbers for the Selectmap controls
*/
#define FPGA_INIT_BIT_NUM 22 /* PB22 */
#define FPGA_RESET_BIT_NUM 11 /* PC11 */
#define FPGA_DONE_BIT_NUM 16 /* PB16 */
#define FPGA_PROGRAM_BIT_NUM 7 /* PA7 */
/* Note that these are pointers to code that is in Flash. They will be
* relocated at runtime.
*/
xilinx_virtex2_slave_selectmap_fns fpga_fns = {
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fpga_pre_config_fn,
fpga_pgm_fn,
fpga_init_fn,
fpga_err_fn,
fpga_done_fn,
fpga_clk_fn,
fpga_cs_fn,
fpga_wr_fn,
fpga_read_data_fn,
fpga_write_data_fn,
fpga_busy_fn,
fpga_abort_fn,
fpga_post_config_fn
};
xilinx_desc fpga[CONFIG_FPGA_COUNT] = {
{xilinx_virtex2,
slave_selectmap,
XILINX_XC2V3000_SIZE,
(void *) &fpga_fns,
0}
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};
/*
* Display FPGA revision information
*/
void print_fpga_revision (void)
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{
vu_long *rev_p = (vu_long *) 0x60000008;
printf ("FPGA Revision 0x%.8lx"
" (Date %.2lx/%.2lx/%.2lx, Status \"%.1lx\", Version %.3lu)\n",
*rev_p,
((*rev_p >> 28) & 0xf),
((*rev_p >> 20) & 0xff),
((*rev_p >> 12) & 0xff),
((*rev_p >> 8) & 0xf), (*rev_p & 0xff));
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}
/*
* Perform a simple test of the FPGA to processor interface using the FPGA's
* inverting bus test register. The great thing about doing a read/write
* test on a register that inverts it's contents is that you avoid any
* problems with bus charging.
* Return 0 on failure, 1 on success.
*/
int test_fpga_ibtr (void)
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{
vu_long *ibtr_p = (vu_long *) 0x60000010;
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vu_long readback;
vu_long compare;
int i;
int j;
int k;
int pass = 1;
static const ulong bitpattern[] = {
0xdeadbeef, /* magic ID pattern for debug */
0x00000001, /* single bit */
0x00000003, /* two adjacent bits */
0x00000007, /* three adjacent bits */
0x0000000F, /* four adjacent bits */
0x00000005, /* two non-adjacent bits */
0x00000015, /* three non-adjacent bits */
0x00000055, /* four non-adjacent bits */
0xaaaaaaaa, /* alternating 1/0 */
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};
for (i = 0; i < 1024; i++) {
for (j = 0; j < 31; j++) {
for (k = 0;
k < sizeof (bitpattern) / sizeof (bitpattern[0]);
k++) {
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*ibtr_p = compare = (bitpattern[k] << j);
readback = *ibtr_p;
if (readback != ~compare) {
printf ("%s:%d: FPGA test fail: expected 0x%.8lx" " actual 0x%.8lx\n", __FUNCTION__, __LINE__, ~compare, readback);
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pass = 0;
break;
}
}
if (!pass)
break;
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}
if (!pass)
break;
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}
if (pass) {
printf ("FPGA inverting bus test passed\n");
print_fpga_revision ();
} else {
printf ("** FPGA inverting bus test failed\n");
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}
return pass;
}
/*
* Set the active-low FPGA reset signal.
*/
void fpga_reset (int assert)
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{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
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PRINTF ("%s:%d: RESET ", __FUNCTION__, __LINE__);
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if (assert) {
immap->im_ioport.iop_pcdat &= ~(0x8000 >> FPGA_RESET_BIT_NUM);
PRINTF ("asserted\n");
} else {
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immap->im_ioport.iop_pcdat |= (0x8000 >> FPGA_RESET_BIT_NUM);
PRINTF ("deasserted\n");
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}
}
/*
* Initialize the SelectMap interface. We assume that the mode and the
* initial state of all of the port pins have already been set!
*/
void fpga_selectmap_init (void)
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{
PRINTF ("%s:%d: Initialize SelectMap interface\n", __FUNCTION__,
__LINE__);
fpga_pgm_fn(false, false, 0); /* make sure program pin is inactive */
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}
/*
* Initialize the fpga. Return 1 on success, 0 on failure.
*/
int gen860t_init_fpga (void)
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{
int i;
PRINTF ("%s:%d: Initialize FPGA interface\n",
__FUNCTION__, __LINE__);
fpga_init ();
fpga_selectmap_init ();
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for (i = 0; i < CONFIG_FPGA_COUNT; i++) {
PRINTF ("%s:%d: Adding fpga %d\n", __FUNCTION__, __LINE__, i);
fpga_add (fpga_xilinx, &fpga[i]);
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}
return 1;
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}
/*
* Set the FPGA's active-low SelectMap program line to the specified level
*/
int fpga_pgm_fn (int assert, int flush, int cookie)
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{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
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PRINTF ("%s:%d: FPGA PROGRAM ", __FUNCTION__, __LINE__);
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if (assert) {
immap->im_ioport.iop_padat &=
~(0x8000 >> FPGA_PROGRAM_BIT_NUM);
PRINTF ("asserted\n");
} else {
immap->im_ioport.iop_padat |=
(0x8000 >> FPGA_PROGRAM_BIT_NUM);
PRINTF ("deasserted\n");
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}
return assert;
}
/*
* Test the state of the active-low FPGA INIT line. Return 1 on INIT
* asserted (low).
*/
int fpga_init_fn (int cookie)
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{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
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PRINTF ("%s:%d: INIT check... ", __FUNCTION__, __LINE__);
if (immap->im_cpm.cp_pbdat & (0x80000000 >> FPGA_INIT_BIT_NUM)) {
PRINTF ("high\n");
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return 0;
} else {
PRINTF ("low\n");
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return 1;
}
}
/*
* Test the state of the active-high FPGA DONE pin
*/
int fpga_done_fn (int cookie)
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{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
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PRINTF ("%s:%d: DONE check... ", __FUNCTION__, __LINE__);
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if (immap->im_cpm.cp_pbdat & (0x80000000 >> FPGA_DONE_BIT_NUM)) {
PRINTF ("high\n");
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return FPGA_SUCCESS;
} else {
PRINTF ("low\n");
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return FPGA_FAIL;
}
}
/*
* Read FPGA SelectMap data.
*/
int fpga_read_data_fn (unsigned char *data, int cookie)
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{
vu_char *p = (vu_char *) SELECTMAP_BASE;
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*data = *p;
#if 0
PRINTF ("%s: Read 0x%x into 0x%p\n", __FUNCTION__, (int) data, data);
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#endif
return (int) data;
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}
/*
* Write data to the FPGA SelectMap port
*/
int fpga_write_data_fn (unsigned char data, int flush, int cookie)
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{
vu_char *p = (vu_char *) SELECTMAP_BASE;
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#if 0
PRINTF ("%s: Write Data 0x%x\n", __FUNCTION__, (int) data);
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#endif
*p = data;
return (int) data;
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}
/*
* Abort and FPGA operation
*/
int fpga_abort_fn (int cookie)
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{
PRINTF ("%s:%d: FPGA program sequence aborted\n",
__FUNCTION__, __LINE__);
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return FPGA_FAIL;
}
/*
* FPGA pre-configuration function. Just make sure that
* FPGA reset is asserted to keep the FPGA from starting up after
* configuration.
*/
int fpga_pre_config_fn (int cookie)
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{
PRINTF ("%s:%d: FPGA pre-configuration\n", __FUNCTION__, __LINE__);
fpga_reset(true);
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return 0;
}
/*
* FPGA post configuration function. Blip the FPGA reset line and then see if
* the FPGA appears to be running.
*/
int fpga_post_config_fn (int cookie)
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{
int rc;
PRINTF ("%s:%d: FPGA post configuration\n", __FUNCTION__, __LINE__);
fpga_reset(true);
udelay (1000);
fpga_reset(false);
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udelay (1000);
/*
* Use the FPGA,s inverting bus test register to do a simple test of the
* processor interface.
*/
rc = test_fpga_ibtr ();
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return rc;
}
/*
* Clock, chip select and write signal assert functions and error check
* and busy functions. These are only stubs because the GEN860T selectmap
* interface handles sequencing of control signals automatically (it uses
* a memory-mapped interface to the FPGA SelectMap port). The design of
* the interface guarantees that the SelectMap port cannot be overrun so
* no busy check is needed. A configuration error is signalled by INIT
* going low during configuration, so there is no need for a separate error
* function.
*/
int fpga_clk_fn (int assert_clk, int flush, int cookie)
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{
return assert_clk;
}
int fpga_cs_fn (int assert_cs, int flush, int cookie)
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{
return assert_cs;
}
int fpga_wr_fn (int assert_write, int flush, int cookie)
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{
return assert_write;
}
int fpga_err_fn (int cookie)
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{
return 0;
}
int fpga_busy_fn (int cookie)
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{
return 0;
}
#endif