ref: e969575d2e55eec89d3a2765b974e023123d8fa5
dir: /sys/src/9/imx8/usdhc.c/
#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"
enum {
/* Controller registers */
SDMAaddr = 0x00>>2,
Blksizecnt = 0x04>>2,
Arg1 = 0x08>>2,
Cmdtm = 0x0c>>2,
Resp0 = 0x10>>2,
Resp1 = 0x14>>2,
Resp2 = 0x18>>2,
Resp3 = 0x1c>>2,
Data = 0x20>>2,
Status = 0x24>>2,
Control0 = 0x28>>2,
Control1 = 0x2c>>2,
Interrupt = 0x30>>2,
Irptmask = 0x34>>2,
Irpten = 0x38>>2,
Control2 = 0x3c>>2,
Capability = 0x40>>2,
Mixctrl = 0x48>>2,
Forceirpt = 0x50>>2,
Dmadesc = 0x58>>2,
Vendorspec = 0xC0>>2,
/* Vendorspec */
ClkEn = 1<<14,
PerEn = 1<<13,
HclkEn = 1<<12,
IpgEn = 1<<11,
Vsel = 1<<1,
/* Control0 (PROT_CTRL) */
Dmaselect = 3<<8,
DmaSDMA = 0<<8,
DmaADMA1 = 1<<8,
DmaADMA2 = 2<<8,
EMODE = 3<<4,
BE = 0<<4,
HBE = 1<<4,
LE = 2<<4,
DwidthMask = 3<<1,
Dwidth8 = 2<<1,
Dwidth4 = 1<<1,
Dwidth1 = 0<<1,
LED = 1<<0,
/* Control1 (SYS_CTRL) */
Srstdata = 1<<26, /* reset data circuit */
Srstcmd = 1<<25, /* reset command circuit */
Srsthc = 1<<24, /* reset complete host controller */
Datatoshift = 16, /* data timeout unit exponent */
Datatomask = 0xF0000,
DTO = 14, /* data timeout exponent (guesswork) */
SDCLKFSshift = 8,
DVSshift = 4,
/* Cmdtm */
Indexshift = 24,
Suspend = 1<<22,
Resume = 2<<22,
Abort = 3<<22,
Isdata = 1<<21,
Ixchken = 1<<20,
Crcchken = 1<<19,
Respmask = 3<<16,
Respnone = 0<<16,
Resp136 = 1<<16,
Resp48 = 2<<16,
Resp48busy = 3<<16,
/* Mixctrl */
Autocmd23 = 1<<7,
Multiblock = 1<<5,
Host2card = 0<<4,
Card2host = 1<<4,
DdrEn = 1<<3,
Autocmd12 = 1<<2,
Blkcnten = 1<<1,
Dmaen = 1<<0,
MixCmdMask = 0xFF ^ DdrEn,
/* Interrupt */
Admaerr = 1<<28,
Acmderr = 1<<24,
Denderr = 1<<22,
Dcrcerr = 1<<21,
Dtoerr = 1<<20,
Cbaderr = 1<<19,
Cenderr = 1<<18,
Ccrcerr = 1<<17,
Ctoerr = 1<<16,
Err = Admaerr|Acmderr|Denderr|Dcrcerr|Dtoerr|Cbaderr|Cenderr|Ccrcerr|Ctoerr,
Cardintr = 1<<8,
Cardinsert = 1<<6,
Readrdy = 1<<5,
Writerdy = 1<<4,
Dmaintr = 1<<3,
Datadone = 1<<1,
Cmddone = 1<<0,
/* Status */
Bufread = 1<<11,
Bufwrite = 1<<10,
Readtrans = 1<<9,
Writetrans = 1<<8,
Clkstable = 1<<3,
Datactive = 1<<2,
Datinhibit = 1<<1,
Cmdinhibit = 1<<0,
};
/*
* ADMA2 descriptor
* See SD Host Controller Simplified Specification Version 2.00
*/
typedef struct Adma Adma;
struct Adma {
u32int desc;
u32int addr;
};
enum {
/* desc fields */
Valid = 1<<0,
End = 1<<1,
Int = 1<<2,
Nop = 0<<4,
Tran = 2<<4,
Link = 3<<4,
OLength = 16,
/* maximum value for Length field */
Maxdma = 1<<12,
};
typedef struct Ctlr Ctlr;
struct Ctlr {
u32int *regs;
int irq;
uint extclk;
Adma *dma;
Rendez r;
};
static void usdhcinterrupt(Ureg*, void*);
#define RR(ctlr, reg) ((ctlr)->regs[reg])
static void
WR(Ctlr *ctlr, int reg, u32int val)
{
if(0)print("WR %2.2ux %ux\n", reg<<2, val);
coherence();
ctlr->regs[reg] = val;
}
static Adma*
dmaalloc(void *addr, int len)
{
int n;
uintptr a;
Adma *adma, *p;
a = PADDR(addr);
n = (len + Maxdma-1) / Maxdma;
adma = sdmalloc(n * sizeof(Adma));
for(p = adma; len > 0; p++){
if(n == 1)
p->desc = len<<OLength | End | Int | Valid | Tran;
else
p->desc = Maxdma<<OLength | Valid | Tran;
p->addr = a;
a += Maxdma;
len -= Maxdma;
n--;
}
cachedwbse(adma, (char*)p - (char*)adma);
return adma;
}
static void
usdhcclk(Ctlr *ctlr, uint freq)
{
uint pre_div = 1, post_div = 1, clk = ctlr->extclk;
while(clk / (pre_div * 16) > freq && pre_div < 256)
pre_div <<= 1;
while(clk / (pre_div * post_div) > freq && post_div < 16)
post_div++;
WR(ctlr, Vendorspec, RR(ctlr, Vendorspec) & ~ClkEn);
WR(ctlr, Control1, (pre_div>>1)<<SDCLKFSshift | (post_div-1)<<DVSshift | DTO<<Datatoshift);
delay(10);
WR(ctlr, Vendorspec, RR(ctlr, Vendorspec) | ClkEn | PerEn);
while((RR(ctlr, Status) & Clkstable) == 0)
;
}
static void
usdhcbus(SDio *io, int width, int speed)
{
Ctlr *ctlr = io->aux;
switch(width){
case 1:
WR(ctlr, Control0, (RR(ctlr, Control0) & ~DwidthMask) | Dwidth1);
break;
case 4:
WR(ctlr, Control0, (RR(ctlr, Control0) & ~DwidthMask) | Dwidth4);
break;
case 8:
WR(ctlr, Control0, (RR(ctlr, Control0) & ~DwidthMask) | Dwidth8);
break;
}
if(speed)
usdhcclk(ctlr, speed);
}
static int
datadone(void *arg)
{
Ctlr *ctlr = arg;
return RR(ctlr, Interrupt) & (Datadone|Err);
}
static void
usdhcreset(Ctlr *ctlr)
{
if(0)print("usdhc control %8.8ux %8.8ux %8.8ux\n",
RR(ctlr, Control0), RR(ctlr, Control1), RR(ctlr, Control2));
WR(ctlr, Control1, Srsthc);
delay(10);
while(RR(ctlr, Control1) & Srsthc)
;
WR(ctlr, Control1, Srstdata);
delay(10);
WR(ctlr, Control1, 0);
}
static int
usdhc1init(SDio *io)
{
static Ctlr ctlr[1] = {
.regs = (u32int*)(VIRTIO+0xB40000), /* USDHC1 */
.irq = IRQusdhc1,
};
io->aux = ctlr;
iomuxpad("pad_sd1_reset_b", "gpio2_io10", "~LVTTL ~HYS PUE ~ODE SLOW 255_OHM");
/* assert reset */
gpioout(GPIO_PIN(2, 10), 0);
iomuxpad("pad_sd1_clk", "usdhc1_clk", "~LVTTL HYS PUE ~ODE FAST 45_OHM");
iomuxpad("pad_sd1_cmd", "usdhc1_cmd", "~LVTTL HYS PUE ~ODE FAST 45_OHM");
iomuxpad("pad_sd1_data0", "usdhc1_data0", "~LVTTL HYS PUE ~ODE FAST 45_OHM");
iomuxpad("pad_sd1_data1", "usdhc1_data1", "~LVTTL HYS PUE ~ODE FAST 45_OHM");
iomuxpad("pad_sd1_data2", "usdhc1_data2", "~LVTTL HYS PUE ~ODE FAST 45_OHM");
iomuxpad("pad_sd1_data3", "usdhc1_data3", "~LVTTL HYS PUE ~ODE FAST 45_OHM");
iomuxpad("pad_sd1_data4", "usdhc1_data4", "~LVTTL HYS PUE ~ODE FAST 45_OHM");
iomuxpad("pad_sd1_data5", "usdhc1_data5", "~LVTTL HYS PUE ~ODE FAST 45_OHM");
iomuxpad("pad_sd1_data6", "usdhc1_data6", "~LVTTL HYS PUE ~ODE FAST 45_OHM");
iomuxpad("pad_sd1_data7", "usdhc1_data7", "~LVTTL HYS PUE ~ODE FAST 45_OHM");
setclkgate("usdhc1.ipg_clk", 0);
setclkgate("usdhc1.ipg_clk_perclk", 0);
setclkrate("usdhc1.ipg_clk_perclk", "system_pll1_clk", 200*Mhz);
setclkgate("usdhc1.ipg_clk_perclk", 1);
setclkgate("usdhc1.ipg_clk", 1);
ctlr->extclk = getclkrate("usdhc1.ipg_clk_perclk");
if(ctlr->extclk <= 0){
print("%s: usdhc1.ipg_clk_perclk not enabled\n", io->name);
return -1;
}
/* release reset */
gpioout(GPIO_PIN(2, 10), 1);
usdhcreset(ctlr);
return 0;
}
static int
usdhc2init(SDio *io)
{
static Ctlr ctlr[1] = {
.regs = (u32int*)(VIRTIO+0xB50000), /* USDHC2 */
.irq = IRQusdhc2,
};
io->aux = ctlr;
iomuxpad("pad_sd2_clk", "usdhc2_clk", "~LVTTL ~HYS ~PUE ~ODE SLOW 75_OHM");
iomuxpad("pad_sd2_cmd", "usdhc2_cmd", "~LVTTL HYS PUE ~ODE SLOW 75_OHM");
iomuxpad("pad_sd2_data0", "usdhc2_data0", "~LVTTL HYS PUE ~ODE SLOW 75_OHM");
iomuxpad("pad_sd2_data1", "usdhc2_data1", "~LVTTL HYS PUE ~ODE SLOW 75_OHM");
iomuxpad("pad_sd2_data2", "usdhc2_data2", "~LVTTL HYS PUE ~ODE SLOW 75_OHM");
iomuxpad("pad_sd2_data3", "usdhc2_data3", "~LVTTL HYS PUE ~ODE SLOW 75_OHM");
setclkgate("usdhc2.ipg_clk", 0);
setclkgate("usdhc2.ipg_clk_perclk", 0);
setclkrate("usdhc2.ipg_clk_perclk", "system_pll1_clk", 200*Mhz);
setclkgate("usdhc2.ipg_clk_perclk", 1);
setclkgate("usdhc2.ipg_clk", 1);
ctlr->extclk = getclkrate("usdhc2.ipg_clk_perclk");
if(ctlr->extclk <= 0){
print("%s: usdhc2.ipg_clk_perclk not enabled\n", io->name);
return -1;
}
usdhcreset(ctlr);
return 0;
}
static int
usdhcinquiry(SDio*, char *inquiry, int inqlen)
{
return snprint(inquiry, inqlen, "USDHC Host Controller");
}
static void
usdhcenable(SDio *io)
{
Ctlr *ctlr = io->aux;
WR(ctlr, Control0, 0);
delay(1);
WR(ctlr, Vendorspec, RR(ctlr, Vendorspec) & ~Vsel);
WR(ctlr, Control0, LE | Dwidth1 | DmaADMA2);
WR(ctlr, Control1, 0);
delay(1);
WR(ctlr, Vendorspec, RR(ctlr, Vendorspec) | HclkEn | IpgEn);
usdhcclk(ctlr, 400000);
WR(ctlr, Irpten, 0);
WR(ctlr, Irptmask, ~(Cardintr|Dmaintr));
WR(ctlr, Interrupt, ~0);
intrenable(ctlr->irq, usdhcinterrupt, ctlr, BUSUNKNOWN, io->name);
}
extern SDiocmd STOP_TRANSMISSION;
static int
usdhccmd(SDio *io, SDiocmd *cmd, u32int arg, u32int *resp)
{
Ctlr *ctlr = io->aux;
u32int c;
int i;
ulong now;
if(0)print("%s: %s (%ux)\n", io->name, cmd->name, arg);
/* using Autocmd12 */
if(cmd == &STOP_TRANSMISSION)
return 0;
c = (u32int)cmd->index << Indexshift;
switch(cmd->resp){
case 0:
c |= Respnone;
break;
case 1:
if(cmd->busy){
c |= Resp48busy | Ixchken | Crcchken;
break;
}
default:
c |= Resp48 | Ixchken | Crcchken;
break;
case 2:
c |= Resp136 | Crcchken;
break;
case 3:
c |= Resp48;
break;
}
if(cmd->data){
if(cmd->data & 1)
c |= Isdata | Card2host | Dmaen;
else
c |= Isdata | Host2card | Dmaen;
if(cmd->data > 2)
c |= Multiblock | Blkcnten | Autocmd12;
}
if(RR(ctlr, Status) & Cmdinhibit){
print("%s: need to reset Cmdinhibit intr %ux stat %ux\n",
io->name, RR(ctlr, Interrupt), RR(ctlr, Status));
WR(ctlr, Control1, RR(ctlr, Control1) | Srstcmd);
while(RR(ctlr, Control1) & Srstcmd)
;
while(RR(ctlr, Status) & Cmdinhibit)
;
}
if((RR(ctlr, Status) & Datinhibit) &&
((c & Isdata) || (c & Respmask) == Resp48busy)){
print("%s: need to reset Datinhibit intr %ux stat %ux\n",
io->name, RR(ctlr, Interrupt), RR(ctlr, Status));
WR(ctlr, Control1, RR(ctlr, Control1) | Srstdata);
while(RR(ctlr, Control1) & Srstdata)
;
while(RR(ctlr, Status) & Datinhibit)
;
}
while(RR(ctlr, Status) & Datactive)
;
WR(ctlr, Arg1, arg);
if((i = (RR(ctlr, Interrupt) & ~Cardintr)) != 0){
if(i != Cardinsert)
print("%s: before command, intr was %ux\n", io->name, i);
WR(ctlr, Interrupt, i);
}
WR(ctlr, Mixctrl, (RR(ctlr, Mixctrl) & ~MixCmdMask) | (c & MixCmdMask));
WR(ctlr, Cmdtm, c & ~0xFFFF);
now = MACHP(0)->ticks;
while(((i=RR(ctlr, Interrupt))&(Cmddone|Err)) == 0)
if(MACHP(0)->ticks - now > HZ)
break;
if((i&(Cmddone|Err)) != Cmddone){
if((i&Err) != Ctoerr)
print("%s: %s cmd %ux arg %ux error intr %ux stat %ux\n",
io->name, cmd->name, c, arg, i, RR(ctlr, Status));
WR(ctlr, Interrupt, i);
if(RR(ctlr, Status)&Cmdinhibit){
WR(ctlr, Control1, RR(ctlr, Control1)|Srstcmd);
while(RR(ctlr, Control1)&Srstcmd)
;
}
error(Eio);
}
WR(ctlr, Interrupt, i & ~(Datadone|Readrdy|Writerdy));
switch(c & Respmask){
case Resp136:
resp[0] = RR(ctlr, Resp0)<<8;
resp[1] = RR(ctlr, Resp0)>>24 | RR(ctlr, Resp1)<<8;
resp[2] = RR(ctlr, Resp1)>>24 | RR(ctlr, Resp2)<<8;
resp[3] = RR(ctlr, Resp2)>>24 | RR(ctlr, Resp3)<<8;
break;
case Resp48:
case Resp48busy:
resp[0] = RR(ctlr, Resp0);
break;
case Respnone:
resp[0] = 0;
break;
}
return 0;
}
static void
usdhciosetup(SDio *io, int write, void *buf, int bsize, int bcount)
{
Ctlr *ctlr = io->aux;
int len = bsize * bcount;
assert(((uintptr)buf&3) == 0);
assert((len&3) == 0);
assert(bsize <= 2048);
WR(ctlr, Blksizecnt, bcount<<16 | bsize);
if(ctlr->dma)
sdfree(ctlr->dma);
ctlr->dma = dmaalloc(buf, len);
if(write)
cachedwbse(buf, len);
else
cachedwbinvse(buf, len);
WR(ctlr, Dmadesc, PADDR(ctlr->dma));
}
static void
usdhcio(SDio *io, int write, uchar *buf, int len)
{
Ctlr *ctlr = io->aux;
u32int i;
WR(ctlr, Irpten, RR(ctlr, Irpten) | Datadone|Err);
while(waserror())
;
sleep(&ctlr->r, datadone, ctlr);
poperror();
WR(ctlr, Irpten, RR(ctlr, Irpten) & ~(Datadone|Err));
i = RR(ctlr, Interrupt);
if((i & (Datadone|Err)) != Datadone){
print("%s: %s error intr %ux stat %ux\n", io->name,
write? "write" : "read", i, RR(ctlr, Status));
WR(ctlr, Interrupt, i);
error(Eio);
}
WR(ctlr, Interrupt, i);
if(!write)
cachedinvse(buf, len);
}
static void
usdhcinterrupt(Ureg*, void *arg)
{
Ctlr *ctlr = arg;
u32int i;
i = RR(ctlr, Interrupt);
if(i&(Datadone|Err))
wakeup(&ctlr->r);
WR(ctlr, Irpten, RR(ctlr, Irpten) & ~i);
}
void
usdhclink(void)
{
static SDio usdhc1 = {
"usdhc1",
usdhc1init,
usdhcenable,
usdhcinquiry,
usdhccmd,
usdhciosetup,
usdhcio,
usdhcbus,
.nomultiwrite = 1,
};
static SDio usdhc2 = {
"usdhc2",
usdhc2init,
usdhcenable,
usdhcinquiry,
usdhccmd,
usdhciosetup,
usdhcio,
usdhcbus,
.nomultiwrite = 1,
};
addmmcio(&usdhc2);
addmmcio(&usdhc1);
}