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Imported dual sramc driver

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This driver allows you to run two SRAMC devices side-by-side as two
separate rdisk devices.
This commit is contained in:
Matt Jenkins
2014-05-10 21:40:23 +01:00
parent 3409198544
commit d859d3b71d
2 changed files with 104 additions and 62 deletions
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1
sys/pic32/cfg/sramc.dev
View File

@@ -2,6 +2,7 @@ always
file rd_sramc.o
require rdisk
define SRAMC_ENABLED YES
define SRAMC%0_ENABLED YES
end always
option data

165
sys/pic32/rd_sramc.c
View File

@@ -3,6 +3,7 @@
*
* This version is for 8MB RAMDISK v.1.1 and compatible
* Pito 7.4.2014 - PIC32MX PMP bus version
* Pito 28.4.2014 - Mod for 2 Units
* Under by retrobsd.org used Licence
* No warranties of any kind
*
@@ -29,23 +30,29 @@
int sw_dkn = -1; /* Statistics slot number */
// Ramdisk v.1.1. wiring
// 8MB Ramdisk v.1.1. wiring
// PMP RAMDISK
// ===================
// PMD<D0-D7> D0-D7
// PMRD /RD
// PMWR /WR
// PMA<0> /DATA
// PMA<1> 0-Unit0
// PMA<10> 0-Unit1
//#define NDATA (1<<0)
//#define UNIT0 (1<<1)
//#define UNIT1 (1<<10)
// RD and WR pulses duration settings
// Minimal recommended settings, increase them when unstable
// No warranties of any kind
// for 120MHz clock, 70ns PSRAM, Ramdisk v.1.1.
// for 120MHz clock, 70ns PSRAM, 8MB Ramdisk v.1.1.
#define ADR_PULSE 1
#define WR_PULSE 5
#define RD_PULSE 11
// for 80MHz clock, 70ns PSRAM, Ramdisk v.1.1.
// for 80MHz clock, 70ns PSRAM, 8MB Ramdisk v.1.1.
//#define ADR_PULSE 1
//#define WR_PULSE 3
//#define RD_PULSE 8
@@ -61,35 +68,31 @@ int sw_dkn = -1; /* Statistics slot number */
//#define RD_PULSE 4
typedef union {
unsigned value;
unsigned int value;
struct {
unsigned nib1: 4; // lowest nibble
unsigned nib2: 4;
unsigned nib3: 4;
unsigned nib4: 4;
unsigned nib5: 4;
unsigned nib6: 4;
unsigned nib7: 4;
unsigned nib8: 4; // highest nibble
unsigned nib1: 4; // lowest nibble
unsigned nib2: 4;
unsigned nib3: 4;
unsigned nib4: 4;
unsigned nib5: 4;
unsigned nib6: 4;
unsigned nib7: 4;
unsigned nib8: 4; // highest nibble
};
} nybbles ;
} nybbles;
/*
* Load the 24 bit address to Ramdisk.
*
*/
inline static void
dev_load_address (addr)
unsigned addr;
inline static void dev_load_address (unsigned int addr)
{
nybbles temp;
temp.value = addr;
while(PMMODE & 0x8000); // Poll - if busy, wait
PMADDR = 1; // set ADR mode (1) to write the Address
PMMODE = 0b10<<8 | (ADR_PULSE<<2); // full ADR speed
PMDIN = temp.nib6; /* write 4 bits */
@@ -108,7 +111,6 @@ dev_load_address (addr)
while(PMMODE & 0x8000); // Poll - if busy, wait
PMDIN = temp.nib1; /* write 4 bits */
}
/*
@@ -117,64 +119,82 @@ dev_load_address (addr)
*/
int sramc_size ( int unit )
{
return 8192; // 4096 for 4MB ramdisk
int srsize;
switch (unit) {
case 0: srsize = 8192; break;
case 1: srsize = 8192; break;
}
return srsize;
}
/*
* Read a block of data.
*/
inline int sramc_read (int unit, unsigned int blockno, char *data, unsigned int nbytes)
inline int sramc_read (int unit, unsigned int blockno, register char *data, register unsigned int nbytes)
{
int i;
//DEBUG9("sramc%d: read block %u, length %u bytes, addr %p\n",
// major(dev), blockno, nbytes, data);
dev_load_address (blockno * DEV_BSIZE);
/* Read data. */
//printf("sramc%d: rd blockno %u, nbytes %u, addr %p\n", unit, blockno, nbytes, data);
while(PMMODE & 0x8000); // Poll - if busy, wait
PMADDR = 0; // set DATA mode (0)
switch (unit) {
// set Unit address and ADDRESS mode (1)
case 0: PMADDR = 0b10000000001; break;
case 1: PMADDR = 0b00000000011; break;
}
dev_load_address (blockno * DEV_BSIZE);
while(PMMODE & 0x8000); // Poll - if busy, wait
PMMODE = 0b10<<8 | (RD_PULSE<<2); // read slowly
PMADDR = PMADDR & 0b10000000010; // set DATA mode
PMDIN; // Read the PMDIN to clear previous data and latch new data
for (i=0; i<nbytes; i++) {
while(PMMODE & 0x8000); // Poll - if busy, wait before reading
*data++ = PMDIN; /* read a byte of data */
}
while (nbytes--) {
while(PMMODE & 0x8000); // Poll - if busy, wait before reading
*data++ = PMDIN; /* read a byte of data */
}
while(PMMODE & 0x8000); // Poll - if busy, wait
PMADDR = 0b10000000011; // deselect
return 1;
}
/*
* Write a block of data.
*/
inline int sramc_write (int unit, unsigned int blockno, char *data, unsigned int nbytes)
inline int sramc_write (int unit, unsigned int blockno, register char *data, register unsigned int nbytes)
{
unsigned i;
//DEBUG9("sramc%d: write block %u, length %u bytes, addr %p\n",
// major(dev), blockno, nbytes, data);
//printf("sramc%d: wr blockno %u, nbytes %u , addr %p\n", unit, blockno, nbytes, data);
while(PMMODE & 0x8000); // Poll - if busy, wait
switch (unit) {
// set Unit address and ADDRESS mode (1)
case 0: PMADDR = 0b10000000001; break;
case 1: PMADDR = 0b00000000011; break;
}
dev_load_address (blockno * DEV_BSIZE);
/* Write data. */
while (PMMODE & 0x8000); // Poll - if busy, wait
PMADDR = 0; // set DATA mode (0)
PMMODE = 0b10<<8 | (WR_PULSE<<2); // faster with write
for (i=0; i<nbytes; i++) {
while(PMMODE & 0x8000); // Poll - if busy, wait
PMDIN = (*data++); /* write a byte of data */
}
PMADDR = PMADDR & 0b10000000010; // set DATA mode
while(nbytes--) {
while(PMMODE & 0x8000); // Poll - if busy, wait
PMDIN = (*data++); /* write a byte of data*/
}
while(PMMODE & 0x8000); // Poll - if busy, wait
PMADDR = 0b10000000011; // deselect
return 1;
}
@@ -184,6 +204,8 @@ inline int sramc_write (int unit, unsigned int blockno, char *data, unsigned int
*/
void sramc_init (int unit)
{
// printf("ramdisk%d: init\n",unit);
struct buf *bp;
// Initialize PMP hardware
@@ -196,31 +218,50 @@ void sramc_init (int unit)
// MODE WAITB WAITM WAITE
PMMODE = 0b10<<8 | 0 | (14<<2) | 0 ; // Mode2 Master 8bit
PMAEN = 1; // PMA<0>, use A0 only
PMAEN = 0b10000000011; // PMA<>, use A10,A1,A0
PMADDR = 0; // start with DATA mode
PMADDR = 0b10000000010; // start with DATA mode
PMCONSET = 1<<15; // PMP enabled
asm volatile ("nop");
// make a couple of dummy reads - it refreshes the cpld internals a little bit :)
while(PMMODE & 0x8000); // Poll - if busy, wait before reading
PMDIN; /* read a byte of data */
while(PMMODE & 0x8000); // Poll - if busy, wait before reading
PMDIN; /* read a byte of data */
switch (unit) {
case 0: PMADDR = 0b10000000000; // start with DATA mode
while(PMMODE & 0x8000); // Poll - if busy, wait before reading
PMDIN; /* read a byte of data */
while(PMMODE & 0x8000); // Poll - if busy, wait before reading
PMDIN; /* read a byte of data */
bp = prepartition_device("sramc0");
PMADDR = 1; // go with with ADDRESS mode now
DEBUG3("sramc%d: init done\n",unit);
bp = prepartition_device("sramc0");
if(bp)
{
if(bp) {
sramc_write(0, 0, bp->b_addr, 512);
brelse(bp);
}
}
// printf("sramc%d: init done\n",unit);
break;
return;
case 1: PMADDR = 0b00000000010; // start with DATA mode
while(PMMODE & 0x8000); // Poll - if busy, wait before reading
PMDIN; /* read a byte of data */
while(PMMODE & 0x8000); // Poll - if busy, wait before reading
PMDIN; /* read a byte of data */
bp = prepartition_device("sramc1");
if(bp) {
sramc_write(1, 0, bp->b_addr, 512);
brelse(bp);
}
// printf("sramc%d: init done\n",unit);
break;
}
while(PMMODE & 0x8000); // Poll - if busy, wait
PMADDR = 0b10000000011; // go with with ADDRESS mode
}
/*
@@ -228,6 +269,6 @@ void sramc_init (int unit)
*/
int sramc_open (int unit)
{
DEBUG3("sramc%d: open\n",unit);
// printf("sramc%d: open done\n",unit);
return 0;
}