emmc: 50MHz highspeed support (from richard miller)
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a8c50a7943
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4 changed files with 139 additions and 51 deletions
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@ -4,6 +4,14 @@
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* Copyright © 2012 Richard Miller <r.miller@acm.org>
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*/
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/*
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Not officially documented: emmc can be connected to different gpio pins
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48-53 (SD card)
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22-27 (P1 header)
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34-39 (wifi - pi3 only)
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using ALT3 function to activate the required routing
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*/
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#include "u.h"
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#include "../port/lib.h"
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#include "../port/error.h"
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@ -20,10 +28,18 @@ enum {
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/* not available from vcore */
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Initfreq = 400000, /* initialisation frequency for MMC */
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SDfreq = 25*Mhz, /* standard SD frequency */
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SDfreqhs = 50*Mhz, /* high speed frequency */
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DTO = 14, /* data timeout exponent (guesswork) */
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GoIdle = 0, /* mmc/sdio go idle state */
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MMCSelect = 7, /* mmc/sd card select command */
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Setbuswidth = 6, /* mmc/sd set bus width command */
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Switchfunc = 6, /* mmc/sd switch function command */
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Voltageswitch = 11, /* md/sdio switch to 1.8V */
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IORWdirect = 52, /* sdio read/write direct command */
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IORWextended = 53, /* sdio read/write extended command */
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Appcmd = 55, /* mmc/sd application command prefix */
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};
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enum {
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@ -56,6 +72,7 @@ enum {
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Slotisrver = 0xfc>>2,
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/* Control0 */
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Hispeed = 1<<2,
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Dwidth4 = 1<<1,
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Dwidth1 = 0<<1,
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@ -126,10 +143,12 @@ static int cmdinfo[64] = {
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[0] Ixchken,
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[2] Resp136,
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[3] Resp48 | Ixchken | Crcchken,
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[5] Resp48,
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[6] Resp48 | Ixchken | Crcchken,
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[7] Resp48busy | Ixchken | Crcchken,
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[8] Resp48 | Ixchken | Crcchken,
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[9] Resp136,
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[11] Resp48 | Ixchken | Crcchken,
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[12] Resp48busy | Ixchken | Crcchken,
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[13] Resp48 | Ixchken | Crcchken,
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[16] Resp48,
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@ -138,6 +157,8 @@ static int cmdinfo[64] = {
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[24] Resp48 | Isdata | Host2card | Ixchken | Crcchken,
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[25] Resp48 | Isdata | Host2card | Multiblock | Blkcnten | Ixchken | Crcchken,
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[41] Resp48,
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[52] Resp48 | Ixchken | Crcchken,
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[53] Resp48 | Ixchken | Crcchken | Isdata,
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[55] Resp48 | Ixchken | Crcchken,
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};
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@ -145,9 +166,10 @@ typedef struct Ctlr Ctlr;
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struct Ctlr {
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Rendez r;
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int datadone;
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Rendez cardr;
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int fastclock;
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ulong extclk;
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int appcmd;
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};
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static Ctlr emmc;
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@ -160,7 +182,8 @@ WR(int reg, u32int val)
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u32int *r = (u32int*)EMMCREGS;
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if(0)print("WR %2.2ux %ux\n", reg<<2, val);
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microdelay(emmc.fastclock? 2: 20);
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microdelay(emmc.fastclock ? 2: 20);
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coherence();
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r[reg] = val;
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}
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@ -175,10 +198,46 @@ clkdiv(uint d)
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return v;
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}
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static void
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emmcclk(uint freq)
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{
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u32int *r;
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uint div;
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int i;
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r = (u32int*)EMMCREGS;
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div = emmc.extclk / (freq<<1);
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if(emmc.extclk / (div<<1) > freq)
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div++;
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WR(Control1, clkdiv(div) |
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DTO<<Datatoshift | Clkgendiv | Clken | Clkintlen);
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for(i = 0; i < 1000; i++){
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delay(1);
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if(r[Control1] & Clkstable)
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break;
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}
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if(i == 1000)
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print("emmc: can't set clock to %ud\n", freq);
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}
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static int
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datadone(void*)
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{
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return emmc.datadone;
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int i;
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u32int *r = (u32int*)EMMCREGS;
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i = r[Interrupt];
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return i & (Datadone|Err);
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}
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static int
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cardintready(void*)
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{
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int i;
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u32int *r = (u32int*)EMMCREGS;
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i = r[Interrupt];
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return i & Cardintr;
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}
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static int
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@ -186,16 +245,13 @@ emmcinit(void)
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{
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u32int *r;
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ulong clk;
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char *s;
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clk = getclkrate(ClkEmmc);
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s = "";
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if(clk == 0){
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s = "Assuming ";
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clk = Extfreq;
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print("emmc: assuming external clock %lud Mhz\n", clk/1000000);
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}
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emmc.extclk = clk;
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print("%seMMC external clock %lud Mhz\n", s, clk/1000000);
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r = (u32int*)EMMCREGS;
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if(0)print("emmc control %8.8ux %8.8ux %8.8ux\n",
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r[Control0], r[Control1], r[Control2]);
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@ -203,6 +259,9 @@ emmcinit(void)
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delay(10);
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while(r[Control1] & Srsthc)
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;
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WR(Control1, Srstdata);
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delay(10);
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WR(Control1, 0);
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return 0;
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}
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@ -222,20 +281,10 @@ emmcinquiry(char *inquiry, int inqlen)
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static void
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emmcenable(void)
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{
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u32int *r;
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int i;
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r = (u32int*)EMMCREGS;
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WR(Control1, clkdiv(emmc.extclk / Initfreq - 1) | DTO << Datatoshift |
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Clkgendiv | Clken | Clkintlen);
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for(i = 0; i < 1000; i++){
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delay(1);
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if(r[Control1] & Clkstable)
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break;
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}
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if(i == 1000)
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print("SD clock won't initialise!\n");
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WR(Irptmask, ~(Dtoerr|Cardintr));
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emmcclk(Initfreq);
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WR(Irpten, 0);
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WR(Irptmask, ~0);
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WR(Interrupt, ~0);
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intrenable(IRQmmc, mmcinterrupt, nil, BUSUNKNOWN, "mmc");
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}
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@ -250,7 +299,28 @@ emmccmd(u32int cmd, u32int arg, u32int *resp)
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r = (u32int*)EMMCREGS;
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assert(cmd < nelem(cmdinfo) && cmdinfo[cmd] != 0);
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c = (cmd << Indexshift) | cmdinfo[cmd];
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if(r[Status] & Cmdinhibit){
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/*
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* CMD6 may be Setbuswidth or Switchfunc depending on Appcmd prefix
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*/
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if(cmd == Switchfunc && !emmc.appcmd)
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c |= Isdata|Card2host;
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if(cmd == IORWextended){
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if(arg & (1<<31))
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c |= Host2card;
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else
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c |= Card2host;
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if((r[Blksizecnt]&0xFFFF0000) != 0x10000)
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c |= Multiblock | Blkcnten;
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}
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/*
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* GoIdle indicates new card insertion: reset bus width & speed
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*/
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if(cmd == GoIdle){
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WR(Control0, r[Control0] & ~(Dwidth4|Hispeed));
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emmcclk(Initfreq);
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}
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if((r[Status] & Datinhibit) &&
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((c & Isdata) || (c & Respmask) == Resp48busy)){
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print("emmccmd: need to reset Cmdinhibit intr %ux stat %ux\n",
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r[Interrupt], r[Status]);
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WR(Control1, r[Control1] | Srstcmd);
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@ -270,7 +340,7 @@ emmccmd(u32int cmd, u32int arg, u32int *resp)
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;
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}
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WR(Arg1, arg);
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if((i = r[Interrupt]) != 0){
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if((i = (r[Interrupt] & ~Cardintr)) != 0){
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if(i != Cardinsert)
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print("emmc: before command, intr was %ux\n", i);
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WR(Interrupt, i);
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@ -281,8 +351,8 @@ emmccmd(u32int cmd, u32int arg, u32int *resp)
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if(m->ticks-now > HZ)
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break;
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if((i&(Cmddone|Err)) != Cmddone){
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if((i&~Err) != Ctoerr)
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print("emmc: cmd %ux error intr %ux stat %ux\n", c, i, r[Status]);
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if((i&~(Err|Cardintr)) != Ctoerr)
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print("emmc: cmd %ux arg %ux error intr %ux stat %ux\n", c, arg, i, r[Status]);
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WR(Interrupt, i);
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if(r[Status]&Cmdinhibit){
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WR(Control1, r[Control1]|Srstcmd);
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@ -308,11 +378,9 @@ emmccmd(u32int cmd, u32int arg, u32int *resp)
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break;
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}
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if((c & Respmask) == Resp48busy){
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WR(Irpten, Datadone|Err);
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WR(Irpten, r[Irpten]|Datadone|Err);
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tsleep(&emmc.r, datadone, 0, 3000);
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i = emmc.datadone;
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emmc.datadone = 0;
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WR(Irpten, 0);
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i = r[Interrupt];
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if((i & Datadone) == 0)
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print("emmcio: no Datadone after CMD%d\n", cmd);
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if(i & Err)
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@ -324,29 +392,46 @@ emmccmd(u32int cmd, u32int arg, u32int *resp)
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* Once card is selected, use faster clock
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*/
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if(cmd == MMCSelect){
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delay(10);
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WR(Control1, clkdiv(emmc.extclk / SDfreq - 1) |
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DTO << Datatoshift | Clkgendiv | Clken | Clkintlen);
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for(i = 0; i < 1000; i++){
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delay(1);
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if(r[Control1] & Clkstable)
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break;
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}
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delay(10);
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delay(1);
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emmcclk(SDfreq);
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delay(1);
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emmc.fastclock = 1;
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}
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/*
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* If card bus width changes, change host bus width
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*/
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if(cmd == Setbuswidth)
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switch(arg){
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if(cmd == Setbuswidth){
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if(emmc.appcmd){
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/*
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* If card bus width changes, change host bus width
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*/
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switch(arg){
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case 0:
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WR(Control0, r[Control0] & ~Dwidth4);
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break;
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case 2:
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WR(Control0, r[Control0] | Dwidth4);
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break;
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}
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}else{
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/*
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* If card switched into high speed mode, increase clock speed
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*/
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if((arg&0x8000000F) == 0x80000001){
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delay(1);
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emmcclk(SDfreqhs);
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delay(1);
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}
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}
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}else if(cmd == IORWdirect && (arg & ~0xFF) == (1<<31|0<<28|7<<9)){
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switch(arg & 0x3){
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case 0:
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WR(Control0, r[Control0] & ~Dwidth4);
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break;
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case 2:
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WR(Control0, r[Control0] | Dwidth4);
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//WR(Control0, r[Control0] | Hispeed);
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break;
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}
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}
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emmc.appcmd = (cmd == Appcmd);
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return 0;
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}
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@ -379,11 +464,9 @@ emmcio(int write, uchar *buf, int len)
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&r[Data], buf, len);
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if(dmawait(DmaChanEmmc) < 0)
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error(Eio);
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WR(Irpten, Datadone|Err);
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WR(Irpten, r[Irpten]|Datadone|Err);
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tsleep(&emmc.r, datadone, 0, 3000);
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i = emmc.datadone;
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emmc.datadone = 0;
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WR(Irpten, 0);
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i = r[Interrupt]&~Cardintr;
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if((i & Datadone) == 0){
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print("emmcio: %d timeout intr %ux stat %ux\n",
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write, i, r[Status]);
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@ -410,9 +493,11 @@ mmcinterrupt(Ureg*, void*)
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r = (u32int*)EMMCREGS;
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i = r[Interrupt];
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r[Interrupt] = i & (Datadone|Err);
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emmc.datadone = i;
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wakeup(&emmc.r);
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if(i&(Datadone|Err))
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wakeup(&emmc.r);
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if(i&Cardintr)
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wakeup(&emmc.cardr);
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WR(Irpten, r[Irpten] & ~i);
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}
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SDio sdio = {
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@ -423,4 +508,5 @@ SDio sdio = {
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emmccmd,
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emmciosetup,
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emmcio,
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.highspeed = 1,
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};
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@ -562,4 +562,5 @@ SDio sdio = {
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emmccmd,
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emmciosetup,
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emmcio,
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.highspeed = 1,
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};
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@ -161,6 +161,7 @@ struct SDio {
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int (*cmd)(u32int, u32int, u32int*);
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void (*iosetup)(int, void*, int, int);
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void (*io)(int, uchar*, int);
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char highspeed;
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};
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extern SDio sdio;
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@ -249,7 +249,7 @@ mmconline(SDunit *unit)
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io->cmd(SET_BLOCKLEN, unit->secsize, r);
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io->cmd(APP_CMD, ctl->rca<<Rcashift, r);
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io->cmd(SET_BUS_WIDTH, Width4, r);
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if(strcmp(io->name, "sdhc") == 0){
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if(io->highspeed){
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if(!waserror()){
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mmcswitchfunc(io, Hispeed|Setfunc);
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poperror();
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