ref: c116550e6a41572796e4db65e4f6acbcb3d9d6f8
dir: /os/mpc/cpm.c/
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
typedef struct Chanuse Chanuse;
struct Chanuse {
Lock;
void* owner;
} ;
enum {
BDSIZE= 1024, /* IO memory reserved for buffer descriptors */
CPMSIZE= 1024, /* IO memory reserved for other uses */
/* channel IDs */
SCC1ID= 0,
I2CID= 1,
IDMA1ID= 1,
SCC2ID= 4,
SPIID= 5,
IDMA2ID= 5,
TIMERID= 5,
SCC3ID= 8,
SMC1ID= 9,
DSP1ID= 9,
SCC4ID= 12,
SMC2ID= 13,
DSP2ID= 13,
NCPMID= 16,
NSCC = 4,
/* SCC.gsmr_l */
ENR = 1<<5, /* enable receiver */
ENT = 1<<4, /* enable transmitter */
NSMC = 2,
/* SMC.smcmr */
TEN = 1<<1, /* transmitter enable */
REN = 1<<0, /* receiver enable */
};
static Map bdmapv[BDSIZE/sizeof(BD)];
static RMap bdmap = {"buffer descriptors"};
static Map cpmmapv[CPMSIZE/sizeof(ulong)];
static RMap cpmmap = {"CPM memory"};
static Lock cpmlock;
static struct {
Lock;
ulong avail;
} brgens;
static Chanuse cpmids[NCPMID];
static CPMdev cpmdevinfo[] = {
[CPscc1] {SCC1ID, 0x1E, 0xA00, 0x3C00},
[CPscc2] {SCC2ID, 0x1D, 0xA20, 0x3D00},
[CPscc3] {SCC3ID, 0x1C, 0xA40, 0x3E00},
[CPscc4] {SCC4ID, 0x1B, 0xA60, 0x3F00},
[CPsmc1] {SMC1ID, 0x04, 0xA80, 0x3E80},
[CPsmc2] {SMC2ID, 0x03, 0xA90, 0x3F80},
[CPdsp1] {DSP1ID, 0x16, 0, 0x3EC0},
[CPdsp2] {DSP2ID, 0x16, 0, 0x3FC0},
[CPidma1] {IDMA1ID, 0x15, 0, 0x3CC0},
[CPidma2] {IDMA2ID, 0x14, 0, 0x3DC0},
[CPtimer] {TIMERID, 0x11, 0, 0x3DB0},
[CPspi] {SPIID, 0x05, 0xAA0, 0x3D80}, /* parameters relocated below */
[CPi2c] {I2CID, 0x10, 0x860, 0x3C80}, /* parameters relocated below */
};
static void i2cspireloc(void);
static void* relocateparam(ulong, int);
/*
* initialise the communications processor module
* and associated device registers
*/
void
cpminit(void)
{
IMM *io;
io = m->iomem;
io->sdcr = 1;
io->rccr = 0;
io->rmds = 0;
io->lccr = 0; /* disable LCD */
io->vccr = 0; /* disable video */
io->i2mod = 0; /* stop I2C */
io->pcint = 0; /* disable all port C interrupts */
io->pcso = 0;
io->pcdir =0;
io->pcpar = 0;
io->pcdat = 0;
io->papar = 0;
io->padir = 0;
io->paodr = 0;
io->padat = 0;
io->pbpar = 0;
io->pbdir = 0;
io->pbodr = 0;
io->pbdat = 0;
io->tgcr = 0x2222; /* reset timers, low-power stop */
eieio();
for(io->cpcr = 0x8001; io->cpcr & 1;) /* reset all CPM channels */
eieio();
mapinit(&bdmap, bdmapv, sizeof(bdmapv));
mapfree(&bdmap, DPBASE, BDSIZE);
mapinit(&cpmmap, cpmmapv, sizeof(cpmmapv));
mapfree(&cpmmap, DPBASE+BDSIZE, CPMSIZE);
if(m->cputype == 0x50 && (getimmr() & 0xFFFF) <= 0x2001)
brgens.avail = 0x3;
else
brgens.avail = 0xF;
i2cspireloc();
}
/*
* return parameters defining a CPM device, given logical ID
*/
CPMdev*
cpmdev(int n)
{
CPMdev *d;
if(n < 0 || n >= nelem(cpmdevinfo))
panic("cpmdev");
d = &cpmdevinfo[n];
if(d->param == nil && d->pbase != 0){
if((n == CPi2c || n == CPspi)){
d->param = relocateparam(d->pbase, 0xB0-0x80); /* relocate */
if(d->param == nil)
return nil;
} else
d->param = (char*)m->iomem+d->pbase;
}
if(d->rbase != 0)
d->regs = (char*)m->iomem+d->rbase;
return d;
}
/*
* issue a request to a CPM device
*/
void
cpmop(CPMdev *cpd, int op, int param)
{
IMM *io;
ilock(&cpmlock);
io = m->iomem;
while(io->cpcr & 1)
eieio();
io->cpcr = (op<<8)|(cpd->id<<4)|(param<<1)|1;
eieio();
while(io->cpcr & 1)
eieio();
iunlock(&cpmlock);
}
/*
* lock the shared IO memory and return a reference to it
*/
IMM*
ioplock(void)
{
ilock(&cpmlock);
return m->iomem;
}
/*
* release the lock on the shared IO memory
*/
void
iopunlock(void)
{
eieio();
iunlock(&cpmlock);
}
/*
* connect SCCx clocks in NSMI mode (x=1 for USB)
*/
void
sccnmsi(int x, int rcs, int tcs)
{
IMM *io;
ulong v;
int sh;
sh = (x-1)*8; /* each SCCx field in sicr is 8 bits */
v = (((rcs&7)<<3) | (tcs&7)) << sh;
io = ioplock();
io->sicr = (io->sicr & ~(0xFF<<sh)) | v;
iopunlock();
}
/*
* connect SMCx clock in NSMI mode
*/
void
smcnmsi(int x, int cs)
{
IMM *io;
ulong v;
int sh;
if(x == 1)
sh = 0;
else
sh = 16;
v = cs << (12+sh);
io = ioplock();
io->simode = (io->simode & ~(0xF000<<sh)) | v; /* SMCx to NMSI mode, set Tx/Rx clock */
iopunlock();
}
/*
* claim the use of a CPM ID (SCC, SMC) that might be used by two mutually exclusive devices,
* for the caller determined by the given parameter (which must be unique).
* returns non-zero if the resource is already in use.
*/
int
cpmidopen(int id, void *owner)
{
Chanuse *use;
use = &cpmids[id];
ilock(use);
if(use->owner != nil && use->owner != owner){
iunlock(use);
return -1;
}
use->owner = owner;
iunlock(use);
return 0;
}
/*
* release a previously claimed CPM ID
*/
void
cpmidclose(int id)
{
Chanuse *use;
use = &cpmids[id];
ilock(use);
use->owner = nil;
iunlock(use);
}
/*
* if SCC d is currently enabled, shut it down
*/
void
sccxstop(CPMdev *d)
{
SCC *scc;
if(d == nil)
return;
scc = d->regs;
if(scc->gsmrl & (ENT|ENR)){
if(scc->gsmrl & ENT)
cpmop(d, GracefulStopTx, 0);
if(scc->gsmrl & ENR)
cpmop(d, CloseRxBD, 0);
delay(1);
scc->gsmrl &= ~(ENT|ENR); /* disable current use */
eieio();
}
scc->sccm = 0; /* mask interrupts */
}
/*
* if SMC d is currently enabled, shut it down
*/
void
smcxstop(CPMdev *d)
{
SMC *smc;
if(d == nil)
return;
smc = d->regs;
if(smc->smcmr & (TEN|REN)){
if(smc->smcmr & TEN)
cpmop(d, StopTx, 0);
if(smc->smcmr & REN)
cpmop(d, CloseRxBD, 0);
delay(1);
smc->smcmr &= ~(TEN|REN);
eieio();
}
smc->smcm = 0; /* mask interrupts */
}
/*
* allocate a buffer descriptor
*/
BD *
bdalloc(int n)
{
ulong a;
a = rmapalloc(&bdmap, 0, n*sizeof(BD), sizeof(BD));
if(a == 0)
panic("bdalloc");
return KADDR(a);
}
/*
* free a buffer descriptor
*/
void
bdfree(BD *b, int n)
{
if(b){
eieio();
mapfree(&bdmap, PADDR(b), n*sizeof(BD));
}
}
/*
* print a buffer descriptor and its data (when debugging)
*/
void
dumpbd(char *name, BD *b, int maxn)
{
uchar *d;
int i;
print("%s #%4.4lux: s=#%4.4ux l=%ud a=#%8.8lux", name, PADDR(b)&0xFFFF, b->status, b->length, b->addr);
if(maxn > b->length)
maxn = b->length;
if(b->addr != 0){
d = KADDR(b->addr);
for(i=0; i<maxn; i++)
print(" %2.2ux", d[i]);
if(i < b->length)
print(" ...");
}
print("\n");
}
/*
* allocate memory from the shared IO memory space
*/
void *
cpmalloc(int n, int align)
{
ulong a;
a = rmapalloc(&cpmmap, 0, n, align);
if(a == 0)
panic("cpmalloc");
return KADDR(a);
}
/*
* free previously allocated shared memory
*/
void
cpmfree(void *p, int n)
{
if(p != nil && n > 0){
eieio();
mapfree(&cpmmap, PADDR(p), n);
}
}
/*
* allocate a baud rate generator, returning its index
* (or -1 if none is available)
*/
int
brgalloc(void)
{
int n;
lock(&brgens);
for(n=0; brgens.avail!=0; n++)
if(brgens.avail & (1<<n)){
brgens.avail &= ~(1<<n);
unlock(&brgens);
return n;
}
unlock(&brgens);
return -1;
}
/*
* free a previously allocated baud rate generator
*/
void
brgfree(int n)
{
if(n >= 0){
if(n > 3 || brgens.avail & (1<<n))
panic("brgfree");
lock(&brgens);
brgens.avail |= 1 << n;
unlock(&brgens);
}
}
/*
* return a value suitable for loading into a baud rate
* generator to produce the given rate if the generator
* is prescaled by the given amount (typically 16).
* the value must be or'd with BaudEnable to start the generator.
*/
ulong
baudgen(int rate, int scale)
{
int d;
rate *= scale;
d = (2*m->cpuhz+rate)/(2*rate) - 1;
if(d < 0)
d = 0;
if(d >= (1<<12))
return ((d+15)>>(4-1))|1; /* divider too big: enable prescale by 16 */
return d<<1;
}
/*
* initialise receive and transmit buffer rings.
*/
int
ioringinit(Ring* r, int nrdre, int ntdre, int bufsize)
{
int i, x;
/* the ring entries must be aligned on sizeof(BD) boundaries */
r->nrdre = nrdre;
if(r->rdr == nil)
r->rdr = bdalloc(nrdre);
/* the buffer size must align with cache lines since the cache doesn't snoop */
bufsize = (bufsize+CACHELINESZ-1)&~(CACHELINESZ-1);
if(r->rrb == nil)
r->rrb = malloc(nrdre*bufsize);
if(r->rdr == nil || r->rrb == nil)
return -1;
dcflush(r->rrb, nrdre*bufsize);
x = PADDR(r->rrb);
for(i = 0; i < nrdre; i++){
r->rdr[i].length = 0;
r->rdr[i].addr = x;
r->rdr[i].status = BDEmpty|BDInt;
x += bufsize;
}
r->rdr[i-1].status |= BDWrap;
r->rdrx = 0;
r->ntdre = ntdre;
if(r->tdr == nil)
r->tdr = bdalloc(ntdre);
if(r->txb == nil)
r->txb = malloc(ntdre*sizeof(Block*));
if(r->tdr == nil || r->txb == nil)
return -1;
for(i = 0; i < ntdre; i++){
r->txb[i] = nil;
r->tdr[i].addr = 0;
r->tdr[i].length = 0;
r->tdr[i].status = 0;
}
r->tdr[i-1].status |= BDWrap;
r->tdrh = 0;
r->tdri = 0;
r->ntq = 0;
return 0;
}
/*
* Allocate a new parameter block for I2C or SPI,
* and plant a pointer to it for the microcode, returning the kernel address.
* See Motorola errata and microcode package:
* the design botch is that the parameters for the SCC2 ethernet overlap the
* SPI/I2C parameter space; this compensates by relocating the latter.
* This routine may be used iff i2cspireloc is used (and it is, above).
*/
static void*
relocateparam(ulong olda, int nb)
{
void *p;
if(olda < (ulong)m->iomem)
olda += (ulong)m->iomem;
p = cpmalloc(nb, 32); /* ``RPBASE must be multiple of 32'' */
if(p == nil)
return p;
*(ushort*)KADDR(olda+0x2C) = PADDR(p); /* set RPBASE */
eieio();
return p;
}
/*
* I2C/SPI microcode package from Motorola
* (to relocate I2C/SPI parameters), which was distributed
* on their web site in S-record format.
*
* May 1998
*/
/*S00600004844521B*/
static ulong ubase1 = 0x2000;
static ulong ucode1[] = {
/* #02202000 */ 0x7FFFEFD9,
/* #02202004 */ 0x3FFD0000,
/* #02202008 */ 0x7FFB49F7,
/* #0220200C */ 0x7FF90000,
/* #02202010 */ 0x5FEFADF7,
/* #02202014 */ 0x5F89ADF7,
/* #02202018 */ 0x5FEFAFF7,
/* #0220201C */ 0x5F89AFF7,
/* #02202020 */ 0x3A9CFBC8,
/* #02202024 */ 0xE7C0EDF0,
/* #02202028 */ 0x77C1E1BB,
/* #0220202C */ 0xF4DC7F1D,
/* #02202030 */ 0xABAD932F,
/* #02202034 */ 0x4E08FDCF,
/* #02202038 */ 0x6E0FAFF8,
/* #0220203C */ 0x7CCF76CF,
/* #02202040 */ 0xFD1FF9CF,
/* #02202044 */ 0xABF88DC6,
/* #02202048 */ 0xAB5679F7,
/* #0220204C */ 0xB0937383,
/* #02202050 */ 0xDFCE79F7,
/* #02202054 */ 0xB091E6BB,
/* #02202058 */ 0xE5BBE74F,
/* #0220205C */ 0xB3FA6F0F,
/* #02202060 */ 0x6FFB76CE,
/* #02202064 */ 0xEE0DF9CF,
/* #02202068 */ 0x2BFBEFEF,
/* #0220206C */ 0xCFEEF9CF,
/* #02202070 */ 0x76CEAD24,
/* #02202074 */ 0x90B2DF9A,
/* #02202078 */ 0x7FDDD0BF,
/* #0220207C */ 0x4BF847FD,
/* #02202080 */ 0x7CCF76CE,
/* #02202084 */ 0xCFEF7E1F,
/* #02202088 */ 0x7F1D7DFD,
/* #0220208C */ 0xF0B6EF71,
/* #02202090 */ 0x7FC177C1,
/* #02202094 */ 0xFBC86079,
/* #02202098 */ 0xE722FBC8,
/* #0220209C */ 0x5FFFDFFF,
/* #022020A0 */ 0x5FB2FFFB,
/* #022020A4 */ 0xFBC8F3C8,
/* #022020A8 */ 0x94A67F01,
/* #022020AC */ 0x7F1D5F39,
/* #022020B0 */ 0xAFE85F5E,
/* #022020B4 */ 0xFFDFDF96,
/* #022020B8 */ 0xCB9FAF7D,
/* #022020BC */ 0x5FC1AFED,
/* #022020C0 */ 0x8C1C5FC1,
/* #022020C4 */ 0xAFDD5FC3,
/* #022020C8 */ 0xDF9A7EFD,
/* #022020CC */ 0xB0B25FB2,
/* #022020D0 */ 0xFFFEABAD,
/* #022020D4 */ 0x5FB2FFFE,
/* #022020D8 */ 0x5FCE600B,
/* #022020DC */ 0xE6BB600B,
/* #022020E0 */ 0x5FCEDFC6,
/* #022020E4 */ 0x27FBEFDF,
/* #022020E8 */ 0x5FC8CFDE,
/* #022020EC */ 0x3A9CE7C0,
/* #022020F0 */ 0xEDF0F3C8,
/* #022020F4 */ 0x7F0154CD,
/* #022020F8 */ 0x7F1D2D3D,
/* #022020FC */ 0x363A7570,
/* #02202100 */ 0x7E0AF1CE,
/* #02202104 */ 0x37EF2E68,
/* #02202108 */ 0x7FEE10EC,
/* #0220210C */ 0xADF8EFDE,
/* #02202110 */ 0xCFEAE52F,
/* #02202114 */ 0x7D0FE12B,
/* #02202118 */ 0xF1CE5F65,
/* #0220211C */ 0x7E0A4DF8,
/* #02202120 */ 0xCFEA5F72,
/* #02202124 */ 0x7D0BEFEE,
/* #02202128 */ 0xCFEA5F74,
/* #0220212C */ 0xE522EFDE,
/* #02202130 */ 0x5F74CFDA,
/* #02202134 */ 0x0B627385,
/* #02202138 */ 0xDF627E0A,
/* #0220213C */ 0x30D8145B,
/* #02202140 */ 0xBFFFF3C8,
/* #02202144 */ 0x5FFFDFFF,
/* #02202148 */ 0xA7F85F5E,
/* #0220214C */ 0xBFFE7F7D,
/* #02202150 */ 0x10D31450,
/* #02202154 */ 0x5F36BFFF,
/* #02202158 */ 0xAF785F5E,
/* #0220215C */ 0xBFFDA7F8,
/* #02202160 */ 0x5F36BFFE,
/* #02202164 */ 0x77FD30C0,
/* #02202168 */ 0x4E08FDCF,
/* #0220216C */ 0xE5FF6E0F,
/* #02202170 */ 0xAFF87E1F,
/* #02202174 */ 0x7E0FFD1F,
/* #02202178 */ 0xF1CF5F1B,
/* #0220217C */ 0xABF80D5E,
/* #02202180 */ 0x5F5EFFEF,
/* #02202184 */ 0x79F730A2,
/* #02202188 */ 0xAFDD5F34,
/* #0220218C */ 0x47F85F34,
/* #02202190 */ 0xAFED7FDD,
/* #02202194 */ 0x50B24978,
/* #02202198 */ 0x47FD7F1D,
/* #0220219C */ 0x7DFD70AD,
/* #022021A0 */ 0xEF717EC1,
/* #022021A4 */ 0x6BA47F01,
/* #022021A8 */ 0x2D267EFD,
/* #022021AC */ 0x30DE5F5E,
/* #022021B0 */ 0xFFFD5F5E,
/* #022021B4 */ 0xFFEF5F5E,
/* #022021B8 */ 0xFFDF0CA0,
/* #022021BC */ 0xAFED0A9E,
/* #022021C0 */ 0xAFDD0C3A,
/* #022021C4 */ 0x5F3AAFBD,
/* #022021C8 */ 0x7FBDB082,
/* #022021CC */ 0x5F8247F8,
};
/*S00600004844521B*/
static ulong ubase2 = 0x2F00;
static ulong ucode2[] = {
/* #02202F00 */ 0x3E303430,
/* #02202F04 */ 0x34343737,
/* #02202F08 */ 0xABF7BF9B,
/* #02202F0C */ 0x994B4FBD,
/* #02202F10 */ 0xBD599493,
/* #02202F14 */ 0x349FFF37,
/* #02202F18 */ 0xFB9B177D,
/* #02202F1C */ 0xD9936956,
/* #02202F20 */ 0xBBFDD697,
/* #02202F24 */ 0xBDD2FD11,
/* #02202F28 */ 0x31DB9BB3,
/* #02202F2C */ 0x63139637,
/* #02202F30 */ 0x93733693,
/* #02202F34 */ 0x193137F7,
/* #02202F38 */ 0x331737AF,
/* #02202F3C */ 0x7BB9B999,
/* #02202F40 */ 0xBB197957,
/* #02202F44 */ 0x7FDFD3D5,
/* #02202F48 */ 0x73B773F7,
/* #02202F4C */ 0x37933B99,
/* #02202F50 */ 0x1D115316,
/* #02202F54 */ 0x99315315,
/* #02202F58 */ 0x31694BF4,
/* #02202F5C */ 0xFBDBD359,
/* #02202F60 */ 0x31497353,
/* #02202F64 */ 0x76956D69,
/* #02202F68 */ 0x7B9D9693,
/* #02202F6C */ 0x13131979,
/* #02202F70 */ 0x79376935,
};
/*
* compensate for chip design botch by installing
* microcode to relocate I2C and SPI parameters away
* from the ethernet parameters
*/
static void
i2cspireloc(void)
{
IMM *io;
static int done;
if(done)
return;
io = m->iomem;
io->rccr &= ~3;
memmove((uchar*)m->iomem+ubase1, ucode1, sizeof(ucode1));
memmove((uchar*)m->iomem+ubase2, ucode2, sizeof(ucode2));
io->rctr1 = 0x802a; /* relocate SPI */
io->rctr2 = 0x8028; /* relocate SPI */
io->rctr3 = 0x802e; /* relocate I2C */
io->rctr4 = 0x802c; /* relocate I2C */
io->rccr |= 1;
done = 1;
}