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rust-raspberrypi-OS-tutorials/0B_readsector/sd.c

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/*
* Copyright (C) 2018 bzt (bztsrc@github)
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
#include "gpio.h"
#include "uart.h"
#include "delays.h"
#include "sd.h"
#define EMMC_ARG2 ((volatile unsigned int*)(MMIO_BASE+0x00300000))
#define EMMC_BLKSIZECNT ((volatile unsigned int*)(MMIO_BASE+0x00300004))
#define EMMC_ARG1 ((volatile unsigned int*)(MMIO_BASE+0x00300008))
#define EMMC_CMDTM ((volatile unsigned int*)(MMIO_BASE+0x0030000C))
#define EMMC_RESP0 ((volatile unsigned int*)(MMIO_BASE+0x00300010))
#define EMMC_RESP1 ((volatile unsigned int*)(MMIO_BASE+0x00300014))
#define EMMC_RESP2 ((volatile unsigned int*)(MMIO_BASE+0x00300018))
#define EMMC_RESP3 ((volatile unsigned int*)(MMIO_BASE+0x0030001C))
#define EMMC_DATA ((volatile unsigned int*)(MMIO_BASE+0x00300020))
#define EMMC_STATUS ((volatile unsigned int*)(MMIO_BASE+0x00300024))
#define EMMC_CONTROL0 ((volatile unsigned int*)(MMIO_BASE+0x00300028))
#define EMMC_CONTROL1 ((volatile unsigned int*)(MMIO_BASE+0x0030002C))
#define EMMC_INTERRUPT ((volatile unsigned int*)(MMIO_BASE+0x00300030))
#define EMMC_INT_MASK ((volatile unsigned int*)(MMIO_BASE+0x00300034))
#define EMMC_INT_EN ((volatile unsigned int*)(MMIO_BASE+0x00300038))
#define EMMC_CONTROL2 ((volatile unsigned int*)(MMIO_BASE+0x0030003C))
#define EMMC_SLOTISR_VER ((volatile unsigned int*)(MMIO_BASE+0x003000FC))
// command flags
#define CMD_NEED_APP 0x80000000
#define CMD_RSPNS_48 0x00020000
#define CMD_ERRORS_MASK 0xfff9c004
#define CMD_RCA_MASK 0xffff0000
// COMMANDs
#define CMD_GO_IDLE 0x00000000
#define CMD_ALL_SEND_CID 0x02010000
#define CMD_SEND_REL_ADDR 0x03020000
#define CMD_CARD_SELECT 0x07030000
#define CMD_SEND_IF_COND 0x08020000
#define CMD_STOP_TRANS 0x0C030000
#define CMD_READ_SINGLE 0x11220010
#define CMD_READ_MULTI 0x12220032
#define CMD_SET_BLOCKCNT 0x17020000
#define CMD_APP_CMD 0x37000000
#define CMD_SET_BUS_WIDTH (0x06020000|CMD_NEED_APP)
#define CMD_SEND_OP_COND (0x29020000|CMD_NEED_APP)
#define CMD_SEND_SCR (0x33220010|CMD_NEED_APP)
// STATUS register settings
#define SR_READ_AVAILABLE 0x00000800
#define SR_DAT_INHIBIT 0x00000002
#define SR_CMD_INHIBIT 0x00000001
#define SR_APP_CMD 0x00000020
// INTERRUPT register settings
#define INT_DATA_TIMEOUT 0x00100000
#define INT_CMD_TIMEOUT 0x00010000
#define INT_READ_RDY 0x00000020
#define INT_CMD_DONE 0x00000001
#define INT_ERROR_MASK 0x017E8000
// CONTROL register settings
#define C0_SPI_MODE_EN 0x00100000
#define C0_HCTL_HS_EN 0x00000004
#define C0_HCTL_DWITDH 0x00000002
#define C1_SRST_DATA 0x04000000
#define C1_SRST_CMD 0x02000000
#define C1_SRST_HC 0x01000000
#define C1_TOUNIT_DIS 0x000f0000
#define C1_TOUNIT_MAX 0x000e0000
#define C1_CLK_GENSEL 0x00000020
#define C1_CLK_EN 0x00000004
#define C1_CLK_STABLE 0x00000002
#define C1_CLK_INTLEN 0x00000001
// SLOTISR_VER values
#define HOST_SPEC_NUM 0x00ff0000
#define HOST_SPEC_NUM_SHIFT 16
#define HOST_SPEC_V3 2
#define HOST_SPEC_V2 1
#define HOST_SPEC_V1 0
// SCR flags
#define SCR_SD_BUS_WIDTH_4 0x00000400
#define SCR_SUPP_SET_BLKCNT 0x02000000
// added by my driver
#define SCR_SUPP_CCS 0x00000001
#define ACMD41_VOLTAGE 0x00ff8000
#define ACMD41_CMD_COMPLETE 0x80000000
#define ACMD41_CMD_CCS 0x40000000
#define ACMD41_ARG_HC 0x51ff8000
unsigned long sd_scr[2], sd_ocr, sd_rca, sd_err, sd_hv;
/**
* Wait for data or command ready
*/
int sd_status(unsigned int mask)
{
int cnt = 500000; while((*EMMC_STATUS & mask) && !(*EMMC_INTERRUPT & INT_ERROR_MASK) && cnt--) wait_msec(1);
return (cnt <= 0 || (*EMMC_INTERRUPT & INT_ERROR_MASK)) ? SD_ERROR : SD_OK;
}
/**
* Wait for interrupt
*/
int sd_int(unsigned int mask)
{
unsigned int r, m=mask | INT_ERROR_MASK;
int cnt = 1000000; while(!(*EMMC_INTERRUPT & m) && cnt--) wait_msec(1);
r=*EMMC_INTERRUPT;
if(cnt<=0 || (r & INT_CMD_TIMEOUT) || (r & INT_DATA_TIMEOUT) ) { *EMMC_INTERRUPT=r; return SD_TIMEOUT; } else
if(r & INT_ERROR_MASK) { *EMMC_INTERRUPT=r; return SD_ERROR; }
*EMMC_INTERRUPT=mask;
return 0;
}
/**
* Send a command
*/
int sd_cmd(unsigned int code, unsigned int arg)
{
int r=0;
sd_err=SD_OK;
if(code&CMD_NEED_APP) {
r=sd_cmd(CMD_APP_CMD|(sd_rca?CMD_RSPNS_48:0),sd_rca);
if(sd_rca && !r) { uart_puts("ERROR: failed to send SD APP command\n"); sd_err=SD_ERROR;return 0;}
code &= ~CMD_NEED_APP;
}
if(sd_status(SR_CMD_INHIBIT)) { uart_puts("ERROR: EMMC busy\n"); sd_err= SD_TIMEOUT;return 0;}
uart_puts("EMMC: Sending command ");uart_hex(code);uart_puts(" arg ");uart_hex(arg);uart_send('\n');
*EMMC_INTERRUPT=*EMMC_INTERRUPT; *EMMC_ARG1=arg; *EMMC_CMDTM=code;
if(code==CMD_SEND_OP_COND) wait_msec(1000); else
if(code==CMD_SEND_IF_COND || code==CMD_APP_CMD) wait_msec(100);
if((r=sd_int(INT_CMD_DONE))) {uart_puts("ERROR: failed to send EMMC command\n");sd_err=r;return 0;}
r=*EMMC_RESP0;
if(code==CMD_GO_IDLE || code==CMD_APP_CMD) return 0; else
if(code==(CMD_APP_CMD|CMD_RSPNS_48)) return r&SR_APP_CMD; else
if(code==CMD_SEND_OP_COND) return r; else
if(code==CMD_SEND_IF_COND) return r==arg? SD_OK : SD_ERROR; else
if(code==CMD_ALL_SEND_CID) {r|=*EMMC_RESP3; r|=*EMMC_RESP2; r|=*EMMC_RESP1; return r; } else
if(code==CMD_SEND_REL_ADDR) {
sd_err=(((r&0x1fff))|((r&0x2000)<<6)|((r&0x4000)<<8)|((r&0x8000)<<8))&CMD_ERRORS_MASK;
return r&CMD_RCA_MASK;
}
return r&CMD_ERRORS_MASK;
// make gcc happy
return 0;
}
/**
* read a block from sd card and return the number of bytes read
* returns 0 on error.
*/
int sd_readblock(unsigned int lba, unsigned char *buffer, unsigned int num)
{
int r,c=0,d;
if(num<1) num=1;
uart_puts("sd_readblock lba ");uart_hex(lba);uart_puts(" num ");uart_hex(num);uart_send('\n');
if(sd_status(SR_DAT_INHIBIT)) {sd_err=SD_TIMEOUT; return 0;}
unsigned int *buf=(unsigned int *)buffer;
if(sd_scr[0] & SCR_SUPP_CCS) {
if(num > 1 && (sd_scr[0] & SCR_SUPP_SET_BLKCNT)) {
sd_cmd(CMD_SET_BLOCKCNT,num);
if(sd_err) return 0;
}
*EMMC_BLKSIZECNT = (num << 16) | 512;
sd_cmd(num == 1 ? CMD_READ_SINGLE : CMD_READ_MULTI,lba);
if(sd_err) return 0;
} else {
*EMMC_BLKSIZECNT = (1 << 16) | 512;
}
while( c < num ) {
if(!(sd_scr[0] & SCR_SUPP_CCS)) {
sd_cmd(CMD_READ_SINGLE,(lba+c)*512);
if(sd_err) return 0;
}
if((r=sd_int(INT_READ_RDY))){uart_puts("\rERROR: Timeout waiting for ready to read\n");sd_err=r;return 0;}
for(d=0;d<128;d++) buf[d] = *EMMC_DATA;
c++; buf+=128;
}
if( num > 1 && !(sd_scr[0] & SCR_SUPP_SET_BLKCNT) && (sd_scr[0] & SCR_SUPP_CCS)) sd_cmd(CMD_STOP_TRANS,0);
return sd_err!=SD_OK || c!=num? 0 : num*512;
}
/**
* set SD clock to frequency in Hz
*/
int sd_clk(unsigned int f)
{
unsigned int d,c=41666666/f,x,s=32,h=0;
int cnt = 100000;
while((*EMMC_STATUS & (SR_CMD_INHIBIT|SR_DAT_INHIBIT)) && cnt--) wait_msec(1);
if(cnt<=0) {
uart_puts("ERROR: timeout waiting for inhibit flag\n");
return SD_ERROR;
}
*EMMC_CONTROL1 &= ~C1_CLK_EN; wait_msec(10);
x=c-1; if(!x) s=0; else {
if(!(x & 0xffff0000u)) { x <<= 16; s -= 16; }
if(!(x & 0xff000000u)) { x <<= 8; s -= 8; }
if(!(x & 0xf0000000u)) { x <<= 4; s -= 4; }
if(!(x & 0xc0000000u)) { x <<= 2; s -= 2; }
if(!(x & 0x80000000u)) { x <<= 1; s -= 1; }
if(s>0) s--;
if(s>7) s=7;
}
if(sd_hv>HOST_SPEC_V2) d=c; else d=(1<<s);
if(d<=2) {d=2;s=0;}
uart_puts("sd_clk divisor ");uart_hex(d);uart_puts(", shift ");uart_hex(s);uart_send('\n');
if(sd_hv>HOST_SPEC_V2) h=(d&0x300)>>2;
d=(((d&0x0ff)<<8)|h);
*EMMC_CONTROL1=(*EMMC_CONTROL1&0xffff003f)|d; wait_msec(10);
*EMMC_CONTROL1 |= C1_CLK_EN; wait_msec(10);
cnt=10000; while(!(*EMMC_CONTROL1 & C1_CLK_STABLE) && cnt--) wait_msec(10);
if(cnt<=0) {
uart_puts("ERROR: failed to get stable clock\n");
return SD_ERROR;
}
return SD_OK;
}
/**
* initialize EMMC to read SDHC card
*/
int sd_init()
{
long r,cnt,ccs=0;
// GPIO_CD
r=*GPFSEL4; r&=~(7<<(7*3)); *GPFSEL4=r;
*GPPUD=2; wait_cycles(150); *GPPUDCLK1=(1<<15); wait_cycles(150); *GPPUD=0; *GPPUDCLK1=0;
r=*GPHEN1; r|=1<<15; *GPHEN1=r;
// GPIO_CLK, GPIO_CMD
r=*GPFSEL4; r|=(7<<(8*3))|(7<<(9*3)); *GPFSEL4=r;
*GPPUD=2; wait_cycles(150); *GPPUDCLK1=(1<<16)|(1<<17); wait_cycles(150); *GPPUD=0; *GPPUDCLK1=0;
// GPIO_DAT0, GPIO_DAT1, GPIO_DAT2, GPIO_DAT3
r=*GPFSEL5; r|=(7<<(0*3)) | (7<<(1*3)) | (7<<(2*3)) | (7<<(3*3)); *GPFSEL5=r;
*GPPUD=2; wait_cycles(150);
*GPPUDCLK1=(1<<18) | (1<<19) | (1<<20) | (1<<21);
wait_cycles(150); *GPPUD=0; *GPPUDCLK1=0;
sd_hv = (*EMMC_SLOTISR_VER & HOST_SPEC_NUM) >> HOST_SPEC_NUM_SHIFT;
uart_puts("EMMC: GPIO set up\n");
// Reset the card.
*EMMC_CONTROL0 = 0; *EMMC_CONTROL1 |= C1_SRST_HC;
cnt=10000; do{wait_msec(10);} while( (*EMMC_CONTROL1 & C1_SRST_HC) && cnt-- );
if(cnt<=0) {
uart_puts("ERROR: failed to reset EMMC\n");
return SD_ERROR;
}
uart_puts("EMMC: reset OK\n");
*EMMC_CONTROL1 |= C1_CLK_INTLEN | C1_TOUNIT_MAX;
wait_msec(10);
// Set clock to setup frequency.
if((r=sd_clk(400000))) return r;
*EMMC_INT_EN = 0xffffffff;
*EMMC_INT_MASK = 0xffffffff;
sd_scr[0]=sd_scr[1]=sd_rca=sd_err=0;
sd_cmd(CMD_GO_IDLE,0);
if(sd_err) return sd_err;
sd_cmd(CMD_SEND_IF_COND,0x000001AA);
if(sd_err) return sd_err;
cnt=6; r=0; while(!(r&ACMD41_CMD_COMPLETE) && cnt--) {
wait_cycles(400);
r=sd_cmd(CMD_SEND_OP_COND,ACMD41_ARG_HC);
uart_puts("EMMC: CMD_SEND_OP_COND returned ");
if(r&ACMD41_CMD_COMPLETE)
uart_puts("COMPLETE ");
if(r&ACMD41_VOLTAGE)
uart_puts("VOLTAGE ");
if(r&ACMD41_CMD_CCS)
uart_puts("CCS ");
uart_hex(r>>32);
uart_hex(r);
uart_send('\n');
if(sd_err!=SD_TIMEOUT && sd_err!=SD_OK ) {
uart_puts("ERROR: EMMC ACMD41 returned error\n");
return sd_err;
}
}
if(!(r&ACMD41_CMD_COMPLETE) || !cnt ) return SD_TIMEOUT;
if(!(r&ACMD41_VOLTAGE)) return SD_ERROR;
if(r&ACMD41_CMD_CCS) ccs=SCR_SUPP_CCS;
sd_cmd(CMD_ALL_SEND_CID,0);
sd_rca = sd_cmd(CMD_SEND_REL_ADDR,0);
uart_puts("EMMC: CMD_SEND_REL_ADDR returned ");
uart_hex(sd_rca>>32);
uart_hex(sd_rca);
uart_send('\n');
if(sd_err) return sd_err;
if((r=sd_clk(25000000))) return r;
sd_cmd(CMD_CARD_SELECT,sd_rca);
if(sd_err) return sd_err;
if(sd_status(SR_DAT_INHIBIT)) return SD_TIMEOUT;
*EMMC_BLKSIZECNT = (1<<16) | 8;
sd_cmd(CMD_SEND_SCR,0);
if(sd_err) return sd_err;
if(sd_int(INT_READ_RDY)) return SD_TIMEOUT;
r=0; cnt=100000; while(r<2 && cnt) {
if( *EMMC_STATUS & SR_READ_AVAILABLE )
sd_scr[r++] = *EMMC_DATA;
else
wait_msec(1);
}
if(r!=2) return SD_TIMEOUT;
if(sd_scr[0] & SCR_SD_BUS_WIDTH_4) {
sd_cmd(CMD_SET_BUS_WIDTH,sd_rca|2);
if(sd_err) return sd_err;
*EMMC_CONTROL0 |= C0_HCTL_DWITDH;
}
// add software flag
uart_puts("EMMC: supports ");
if(sd_scr[0] & SCR_SUPP_SET_BLKCNT)
uart_puts("SET_BLKCNT ");
if(ccs)
uart_puts("CCS ");
uart_send('\n');
sd_scr[0]&=~SCR_SUPP_CCS;
sd_scr[0]|=ccs;
return SD_OK;
}
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