ref: a7c01127f9749fe471367c6461cde357403cc3b3
dir: /sys/src/9/port/sdmmc.c/
/*
* mmc / sd memory card
*
* Copyright © 2012 Richard Miller <r.miller@acm.org>
*
* Assumes only one card on the bus
*/
#include "u.h"
#include "../port/lib.h"
#include "../port/error.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/sd.h"
#define CSD(end, start) rbits(csd, start, (end)-(start)+1)
typedef struct Ctlr Ctlr;
enum {
Inittimeout = 15,
Multiblock = 1,
/* Commands */
GO_IDLE_STATE = 0,
ALL_SEND_CID = 2,
SEND_RELATIVE_ADDR= 3,
SELECT_CARD = 7,
SD_SEND_IF_COND = 8,
SEND_CSD = 9,
STOP_TRANSMISSION= 12,
SEND_STATUS = 13,
SET_BLOCKLEN = 16,
READ_SINGLE_BLOCK= 17,
READ_MULTIPLE_BLOCK= 18,
WRITE_BLOCK = 24,
WRITE_MULTIPLE_BLOCK= 25,
APP_CMD = 55, /* prefix for following app-specific commands */
SET_BUS_WIDTH = 6,
SD_SEND_OP_COND = 41,
/* Command arguments */
/* SD_SEND_IF_COND */
Voltage = 1<<8,
Checkpattern = 0x42,
/* SELECT_CARD */
Rcashift = 16,
/* SD_SEND_OP_COND */
Hcs = 1<<30, /* host supports SDHC & SDXC */
Ccs = 1<<30, /* card is SDHC or SDXC */
V3_3 = 3<<20, /* 3.2-3.4 volts */
/* SET_BUS_WIDTH */
Width1 = 0<<0,
Width4 = 2<<0,
/* OCR (operating conditions register) */
Powerup = 1<<31,
};
struct Ctlr {
SDev *dev;
SDio *io;
/* SD card registers */
u16int rca;
u32int ocr;
u32int cid[4];
u32int csd[4];
};
extern SDifc sdmmcifc;
extern SDio sdio;
static uint
rbits(u32int *p, uint start, uint len)
{
uint w, off, v;
w = start / 32;
off = start % 32;
if(off == 0)
v = p[w];
else
v = p[w] >> off | p[w+1] << (32-off);
if(len < 32)
return v & ((1<<len) - 1);
else
return v;
}
static void
identify(SDunit *unit, u32int *csd)
{
uint csize, mult;
unit->secsize = 1 << CSD(83, 80);
switch(CSD(127, 126)){
case 0: /* CSD version 1 */
csize = CSD(73, 62);
mult = CSD(49, 47);
unit->sectors = (csize+1) * (1<<(mult+2));
break;
case 1: /* CSD version 2 */
csize = CSD(69, 48);
unit->sectors = (csize+1) * 0x80000LL / unit->secsize;
break;
}
if(unit->secsize == 1024){
unit->sectors <<= 1;
unit->secsize = 512;
}
}
static SDev*
mmcpnp(void)
{
SDev *sdev;
Ctlr *ctl;
if(sdio.init() < 0)
return nil;
sdev = malloc(sizeof(SDev));
if(sdev == nil)
return nil;
ctl = malloc(sizeof(Ctlr));
if(ctl == nil){
free(sdev);
return nil;
}
sdev->idno = 'M';
sdev->ifc = &sdmmcifc;
sdev->nunit = 1;
sdev->ctlr = ctl;
ctl->dev = sdev;
ctl->io = &sdio;
return sdev;
}
static int
mmcverify(SDunit *unit)
{
int n;
Ctlr *ctl;
ctl = unit->dev->ctlr;
n = ctl->io->inquiry((char*)&unit->inquiry[8], sizeof(unit->inquiry)-8);
if(n < 0)
return 0;
unit->inquiry[0] = 0x00; /* direct access (disk) */
unit->inquiry[1] = 0x80; /* removable */
unit->inquiry[4] = sizeof(unit->inquiry)-4;
return 1;
}
static int
mmcenable(SDev* dev)
{
Ctlr *ctl;
ctl = dev->ctlr;
ctl->io->enable();
return 1;
}
static int
mmconline(SDunit *unit)
{
int hcs, i;
u32int r[4];
Ctlr *ctl;
SDio *io;
ctl = unit->dev->ctlr;
io = ctl->io;
assert(unit->subno == 0);
if(waserror()){
unit->sectors = 0;
return 0;
}
if(unit->sectors != 0){
io->cmd(SEND_STATUS, ctl->rca<<Rcashift, r);
poperror();
return 1;
}
io->cmd(GO_IDLE_STATE, 0, r);
hcs = 0;
if(!waserror()){
io->cmd(SD_SEND_IF_COND, Voltage|Checkpattern, r);
if(r[0] == (Voltage|Checkpattern)) /* SD 2.0 or above */
hcs = Hcs;
poperror();
}
for(i = 0; i < Inittimeout; i++){
delay(100);
io->cmd(APP_CMD, 0, r);
io->cmd(SD_SEND_OP_COND, hcs|V3_3, r);
if(r[0] & Powerup)
break;
}
if(i == Inittimeout){
print("sdmmc: card won't power up\n");
poperror();
return 2;
}
ctl->ocr = r[0];
io->cmd(ALL_SEND_CID, 0, r);
memmove(ctl->cid, r, sizeof ctl->cid);
io->cmd(SEND_RELATIVE_ADDR, 0, r);
ctl->rca = r[0]>>16;
io->cmd(SEND_CSD, ctl->rca<<Rcashift, r);
memmove(ctl->csd, r, sizeof ctl->csd);
identify(unit, ctl->csd);
io->cmd(SELECT_CARD, ctl->rca<<Rcashift, r);
io->cmd(SET_BLOCKLEN, unit->secsize, r);
io->cmd(APP_CMD, ctl->rca<<Rcashift, r);
io->cmd(SET_BUS_WIDTH, Width4, r);
poperror();
return 1;
}
static int
mmcrctl(SDunit *unit, char *p, int l)
{
Ctlr *ctl;
int i, n;
ctl = unit->dev->ctlr;
assert(unit->subno == 0);
if(unit->sectors == 0){
mmconline(unit);
if(unit->sectors == 0)
return 0;
}
n = snprint(p, l, "rca %4.4ux ocr %8.8ux\ncid ", ctl->rca, ctl->ocr);
for(i = nelem(ctl->cid)-1; i >= 0; i--)
n += snprint(p+n, l-n, "%8.8ux", ctl->cid[i]);
n += snprint(p+n, l-n, " csd ");
for(i = nelem(ctl->csd)-1; i >= 0; i--)
n += snprint(p+n, l-n, "%8.8ux", ctl->csd[i]);
n += snprint(p+n, l-n, "\ngeometry %llud %ld\n",
unit->sectors, unit->secsize);
return n;
}
static long
mmcbio(SDunit *unit, int lun, int write, void *data, long nb, uvlong bno)
{
int len, tries;
ulong b;
u32int r[4];
uchar *buf;
Ctlr *ctl;
SDio *io;
USED(lun);
ctl = unit->dev->ctlr;
io = ctl->io;
assert(unit->subno == 0);
if(unit->sectors == 0)
error(Echange);
buf = data;
len = unit->secsize;
if(Multiblock){
b = bno;
tries = 0;
while(waserror())
if(++tries == 3)
nexterror();
io->iosetup(write, buf, len, nb);
if(waserror()){
io->cmd(STOP_TRANSMISSION, 0, r);
nexterror();
}
io->cmd(write? WRITE_MULTIPLE_BLOCK: READ_MULTIPLE_BLOCK,
ctl->ocr & Ccs? b: b * len, r);
io->io(write, buf, nb * len);
poperror();
io->cmd(STOP_TRANSMISSION, 0, r);
poperror();
b += nb;
}else{
for(b = bno; b < bno + nb; b++){
io->iosetup(write, buf, len, 1);
io->cmd(write? WRITE_BLOCK : READ_SINGLE_BLOCK,
ctl->ocr & Ccs? b: b * len, r);
io->io(write, buf, len);
buf += len;
}
}
return (b - bno) * len;
}
static int
mmcrio(SDreq *r)
{
int i, rw, count;
uvlong lba;
if((i = sdfakescsi(r)) != SDnostatus)
return r->status = i;
if((i = sdfakescsirw(r, &lba, &count, &rw)) != SDnostatus)
return i;
r->rlen = mmcbio(r->unit, r->lun, rw == SDwrite, r->data, count, lba);
return r->status = SDok;
}
SDifc sdmmcifc = {
.name = "mmc",
.pnp = mmcpnp,
.enable = mmcenable,
.verify = mmcverify,
.online = mmconline,
.rctl = mmcrctl,
.bio = mmcbio,
.rio = mmcrio,
};