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rockbox/firmware/target/arm/as3525/sd-as3525v2.c
Michael Sevakis 307cb04948 AS3525v1/2: Enable nested handling of interrupts 
Mostly for the sake of reducing latency for audio servicing where other service
routines can take a long time to complete, leading to occasional drops of a
few samples, especially in recording, where they are fairly frequent.

One mystery that remains is GPIOA IRQ being interrupted causes strange
undefined instruction exceptions, most easily produced on my Fuze V2 with a
scrollwheel. Making GPIOA the top ISR for now, thus not interruptible, cures it.

SVC mode is used during the actual calls. Hopefully the SVC stack size is
sufficient. Prologue and epilogue code only uses the IRQ stack and is large
enough.

Any routine code that should not be interrupted should disable IRQ itself from
here on in.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31642 a1c6a512-1295-4272-9138-f99709370657
2012-01-08 22:29:25 +00:00

1061 lines
31 KiB
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 Daniel Ankers
* Copyright © 2008-2009 Rafaël Carré
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h" /* for HAVE_MULTIVOLUME */
#include "fat.h"
#include "thread.h"
#include "gcc_extensions.h"
#include "led.h"
#include "sdmmc.h"
#include "system.h"
#include "kernel.h"
#include "cpu.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "as3525v2.h"
#include "pl081.h" /* DMA controller */
#include "dma-target.h" /* DMA request lines */
#include "clock-target.h"
#include "panic.h"
#include "stdbool.h"
#include "ata_idle_notify.h"
#include "sd.h"
#include "usb.h"
#ifdef HAVE_HOTSWAP
#include "disk.h"
#endif
#include "lcd.h"
#include <stdarg.h>
#include "sysfont.h"
#define INTERNAL_AS3525 0 /* embedded SD card */
#define SD_SLOT_AS3525 1 /* SD slot if present */
/* Clipv2 Clip+ and Fuzev2 OF all occupy the same size */
#define AMS_OF_SIZE 0xf000
/* command flags */
#define MCI_NO_RESP (0<<0)
#define MCI_RESP (1<<0)
#define MCI_LONG_RESP (1<<1)
#define MCI_ACMD (1<<2)
/* controller registers */
#define SD_BASE 0xC6070000
#define SD_REG(x) (*(volatile unsigned long *) (SD_BASE+x))
#define MCI_CTRL SD_REG(0x00)
/* control bits */
#define CTRL_RESET (1<<0)
#define FIFO_RESET (1<<1)
#define DMA_RESET (1<<2)
#define INT_ENABLE (1<<4)
#define DMA_ENABLE (1<<5)
#define READ_WAIT (1<<6)
#define SEND_IRQ_RESP (1<<7)
#define ABRT_READ_DATA (1<<8)
#define SEND_CCSD (1<<9)
#define SEND_AS_CCSD (1<<10)
#define EN_OD_PULLUP (1<<24)
#define MCI_PWREN SD_REG(0x04) /* power enable */
#define PWR_CRD_0 (1<<0)
#define PWR_CRD_1 (1<<1)
#define PWR_CRD_2 (1<<2)
#define PWR_CRD_3 (1<<3)
#define MCI_CLKDIV SD_REG(0x08) /* clock divider */
/* CLK_DIV_0 : bits 7:0
* CLK_DIV_1 : bits 15:8
* CLK_DIV_2 : bits 23:16
* CLK_DIV_3 : bits 31:24
*/
#define MCI_CLKSRC SD_REG(0x0C) /* clock source */
/* CLK_SRC_CRD0: bits 1:0
* CLK_SRC_CRD1: bits 3:2
* CLK_SRC_CRD2: bits 5:4
* CLK_SRC_CRD3: bits 7:6
*/
#define MCI_CLKENA SD_REG(0x10) /* clock enable */
#define CCLK_ENA_CRD0 (1<<0)
#define CCLK_ENA_CRD1 (1<<1)
#define CCLK_ENA_CRD2 (1<<2)
#define CCLK_ENA_CRD3 (1<<3)
#define CCLK_LP_CRD0 (1<<16) /* LP --> Low Power Mode? */
#define CCLK_LP_CRD1 (1<<17)
#define CCLK_LP_CRD2 (1<<18)
#define CCLK_LP_CRD3 (1<<19)
#define MCI_TMOUT SD_REG(0x14) /* timeout */
/* response timeout bits 0:7
* data timeout bits 8:31
*/
#define MCI_CTYPE SD_REG(0x18) /* card type */
/* 1 bit per card, set = wide bus */
#define WIDTH4_CRD0 (1<<0)
#define WIDTH4_CRD1 (1<<1)
#define WIDTH4_CRD2 (1<<2)
#define WIDTH4_CRD3 (1<<3)
#define MCI_BLKSIZ SD_REG(0x1C) /* block size bits 0:15*/
#define MCI_BYTCNT SD_REG(0x20) /* byte count bits 0:31*/
#define MCI_MASK SD_REG(0x24) /* interrupt mask */
#define MCI_ARGUMENT SD_REG(0x28)
#define MCI_COMMAND SD_REG(0x2C)
/* command bits (bits 5:0 are the command index) */
#define CMD_RESP_EXP_BIT (1<<6)
#define CMD_RESP_LENGTH_BIT (1<<7)
#define CMD_CHECK_CRC_BIT (1<<8)
#define CMD_DATA_EXP_BIT (1<<9)
#define CMD_RW_BIT (1<<10)
#define CMD_TRANSMODE_BIT (1<<11)
#define CMD_SENT_AUTO_STOP_BIT (1<<12)
#define CMD_WAIT_PRV_DAT_BIT (1<<13)
#define CMD_ABRT_CMD_BIT (1<<14)
#define CMD_SEND_INIT_BIT (1<<15)
#define CMD_CARD_NO(x) ((x)<<16) /* 5 bits wide */
#define CMD_SEND_CLK_ONLY (1<<21)
#define CMD_READ_CEATA (1<<22)
#define CMD_CCS_EXPECTED (1<<23)
#define CMD_DONE_BIT (1<<31)
#define TRANSFER_CMD (cmd == SD_READ_MULTIPLE_BLOCK || \
cmd == SD_WRITE_MULTIPLE_BLOCK)
#define MCI_RESP0 SD_REG(0x30)
#define MCI_RESP1 SD_REG(0x34)
#define MCI_RESP2 SD_REG(0x38)
#define MCI_RESP3 SD_REG(0x3C)
#define MCI_MASK_STATUS SD_REG(0x40) /* masked interrupt status */
#define MCI_RAW_STATUS SD_REG(0x44) /* raw interrupt status, also used as
* status clear */
/* interrupt bits */ /* C D E (Cmd) (Data) (End) */
#define MCI_INT_CRDDET (1<<0) /* card detect */
#define MCI_INT_RE (1<<1) /* x response error */
#define MCI_INT_CD (1<<2) /* x command done */
#define MCI_INT_DTO (1<<3) /* x data transfer over */
#define MCI_INT_TXDR (1<<4) /* tx fifo data request */
#define MCI_INT_RXDR (1<<5) /* rx fifo data request */
#define MCI_INT_RCRC (1<<6) /* x response crc error */
#define MCI_INT_DCRC (1<<7) /* x data crc error */
#define MCI_INT_RTO (1<<8) /* x response timeout */
#define MCI_INT_DRTO (1<<9) /* x data read timeout */
#define MCI_INT_HTO (1<<10) /* x data starv timeout */
#define MCI_INT_FRUN (1<<11) /* x fifo over/underrun */
#define MCI_INT_HLE (1<<12) /* x x hw locked while error */
#define MCI_INT_SBE (1<<13) /* x start bit error */
#define MCI_INT_ACD (1<<14) /* auto command done */
#define MCI_INT_EBE (1<<15) /* x end bit error */
#define MCI_INT_SDIO (0xf<<16)
/*
* STATUS register
* & 0xBA80 = MCI_INT_DCRC | MCI_INT_DRTO | MCI_INT_FRUN | \
* MCI_INT_HLE | MCI_INT_SBE | MCI_INT_EBE
* & 8 = MCI_INT_DTO
* & 0x428 = MCI_INT_DTO | MCI_INT_RXDR | MCI_INT_HTO
* & 0x418 = MCI_INT_DTO | MCI_INT_TXDR | MCI_INT_HTO
*/
#define MCI_CMD_ERROR \
(MCI_INT_RE | \
MCI_INT_RCRC | \
MCI_INT_RTO | \
MCI_INT_HLE)
#define MCI_DATA_ERROR \
( MCI_INT_DCRC | \
MCI_INT_DRTO | \
MCI_INT_HTO | \
MCI_INT_FRUN | \
MCI_INT_HLE | \
MCI_INT_SBE | \
MCI_INT_EBE)
#define MCI_STATUS SD_REG(0x48)
#define FIFO_RX_WM (1<<0)
#define FIFO_TX_WM (1<<1)
#define FIFO_EMPTY (1<<2)
#define FIFO_FULL (1<<3)
#define CMD_FSM_STATE_B0 (1<<4)
#define CMD_FSM_STATE_B1 (1<<5)
#define CMD_FSM_STATE_B2 (1<<6)
#define CMD_FSM_STATE_B3 (1<<7)
#define DATA_3_STAT (1<<8)
#define DATA_BUSY (1<<9)
#define DATA_STAT_MC_BUSY (1<<10)
#define RESP_IDX_B0 (1<<11)
#define RESP_IDX_B1 (1<<12)
#define RESP_IDX_B2 (1<<13)
#define RESP_IDX_B3 (1<<14)
#define RESP_IDX_B4 (1<<15)
#define RESP_IDX_B5 (1<<16)
#define FIFO_CNT_B00 (1<<17)
#define FIFO_CNT_B01 (1<<18)
#define FIFO_CNT_B02 (1<<19)
#define FIFO_CNT_B03 (1<<20)
#define FIFO_CNT_B04 (1<<21)
#define FIFO_CNT_B05 (1<<22)
#define FIFO_CNT_B06 (1<<23)
#define FIFO_CNT_B07 (1<<24)
#define FIFO_CNT_B08 (1<<25)
#define FIFO_CNT_B09 (1<<26)
#define FIFO_CNT_B10 (1<<27)
#define FIFO_CNT_B11 (1<<28)
#define FIFO_CNT_B12 (1<<29)
#define DMA_ACK (1<<30)
#define START_CMD (1<<31)
#define MCI_FIFOTH SD_REG(0x4C) /* FIFO threshold */
/* TX watermark : bits 11:0
* RX watermark : bits 27:16
* DMA MTRANS SIZE : bits 30:28
* bits 31, 15:12 : unused
*/
#define MCI_FIFOTH_MASK 0x8000f000
#define MCI_CDETECT SD_REG(0x50) /* card detect */
#define CDETECT_CRD_0 (1<<0)
#define CDETECT_CRD_1 (1<<1)
#define CDETECT_CRD_2 (1<<2)
#define CDETECT_CRD_3 (1<<3)
#define MCI_WRTPRT SD_REG(0x54) /* write protect */
#define MCI_GPIO SD_REG(0x58)
#define MCI_TCBCNT SD_REG(0x5C) /* transferred CIU byte count (card)*/
#define MCI_TBBCNT SD_REG(0x60) /* transferred host/DMA to/from bytes (FIFO)*/
#define MCI_DEBNCE SD_REG(0x64) /* card detect debounce bits 23:0*/
#define MCI_USRID SD_REG(0x68) /* user id */
#define MCI_VERID SD_REG(0x6C) /* version id */
#define MCI_HCON SD_REG(0x70) /* hardware config */
/* bit 0 : card type
* bits 5:1 : maximum card index
* bit 6 : BUS TYPE
* bits 9:7 : DATA WIDTH
* bits 15:10 : ADDR WIDTH
* bits 17:16 : DMA IF
* bits 20:18 : DMA WIDTH
* bit 21 : FIFO RAM INSIDE
* bit 22 : IMPL HOLD REG
* bit 23 : SET CLK FALSE
* bits 25:24 : MAX CLK DIV IDX
* bit 26 : AREA OPTIM
*/
#define MCI_BMOD SD_REG(0x80) /* bus mode */
/* bit 0 : SWR
* bit 1 : FB
* bits 6:2 : DSL
* bit 7 : DE
* bit 10:8 : PBL
*/
#define MCI_PLDMND SD_REG(0x84) /* poll demand */
#define MCI_DBADDR SD_REG(0x88) /* descriptor base address */
#define MCI_IDSTS SD_REG(0x8C) /* internal DMAC status */
/* bit 0 : TI
* bit 1 : RI
* bit 2 : FBE
* bit 3 : unused
* bit 4 : DU
* bit 5 : CES
* bits 7:6 : unused
* bits 8 : NIS
* bit 9 : AIS
* bits 12:10 : EB
* bits 16:13 : FSM
*/
#define MCI_IDINTEN SD_REG(0x90) /* internal DMAC interrupt enable */
/* bit 0 : TI
* bit 1 : RI
* bit 2 : FBE
* bit 3 : unused
* bit 4 : DU
* bit 5 : CES
* bits 7:6 : unused
* bits 8 : NI
* bit 9 : AI
*/
#define MCI_DSCADDR SD_REG(0x94) /* current host descriptor address */
#define MCI_BUFADDR SD_REG(0x98) /* current host buffer address */
#define MCI_FIFO ((unsigned long *) (SD_BASE+0x100))
#define UNALIGNED_NUM_SECTORS 10
static unsigned char aligned_buffer[UNALIGNED_NUM_SECTORS* SD_BLOCK_SIZE] __attribute__((aligned(32))); /* align on cache line size */
static unsigned char *uncached_buffer = AS3525_UNCACHED_ADDR(&aligned_buffer[0]);
static tCardInfo card_info[NUM_DRIVES];
/* for compatibility */
static long last_disk_activity = -1;
static long sd_stack [(DEFAULT_STACK_SIZE*2 + 0x200)/sizeof(long)];
static const char sd_thread_name[] = "ata/sd";
static struct mutex sd_mtx SHAREDBSS_ATTR;
static struct event_queue sd_queue;
#ifndef BOOTLOADER
bool sd_enabled = false;
#endif
static struct semaphore transfer_completion_signal;
static struct semaphore command_completion_signal;
static volatile bool retry;
static volatile int cmd_error;
#if defined(HAVE_MULTIDRIVE)
#define EXT_SD_BITS (1<<2)
#endif
static inline void mci_delay(void) { udelay(1000); }
void INT_NAND(void)
{
MCI_CTRL &= ~INT_ENABLE;
/* use raw status here as we need to check some Ints that are masked */
const int status = MCI_RAW_STATUS;
MCI_RAW_STATUS = status; /* clear status */
if(status & MCI_DATA_ERROR)
retry = true;
if( status & (MCI_INT_DTO|MCI_DATA_ERROR))
semaphore_release(&transfer_completion_signal);
cmd_error = status & MCI_CMD_ERROR;
if(status & MCI_INT_CD)
semaphore_release(&command_completion_signal);
MCI_CTRL |= INT_ENABLE;
}
static inline bool card_detect_target(void)
{
#if defined(HAVE_MULTIDRIVE)
#if defined(SANSA_FUZEV2)
return GPIOA_PIN(2);
#elif defined(SANSA_CLIPPLUS) || defined(SANSA_CLIPZIP)
return !(GPIOA_PIN(2));
#else
#error "microSD pin not defined for your target"
#endif
#else
return false;
#endif
}
static bool send_cmd(const int drive, const int cmd, const int arg, const int flags,
unsigned long *response)
{
int card_no;
if ((flags & MCI_ACMD) && /* send SD_APP_CMD first */
!send_cmd(drive, SD_APP_CMD, card_info[drive].rca, MCI_RESP, response))
return false;
#if defined(SANSA_FUZEV2) || defined(SANSA_CLIPPLUS) || defined(SANSA_CLIPZIP)
if (amsv2_variant == 1)
GPIOB_PIN(5) = (drive == INTERNAL_AS3525) ? 1 << 5 : 0;
#endif
MCI_ARGUMENT = arg;
#if defined(SANSA_FUZEV2) || defined(SANSA_CLIPPLUS) || defined(SANSA_CLIPZIP)
if (amsv2_variant == 1)
card_no = 1 << 16;
else
#endif
card_no = CMD_CARD_NO(drive);
/* Construct MCI_COMMAND */
MCI_COMMAND =
/*b5:0*/ cmd
/*b6 */ | ((flags & MCI_RESP) ? CMD_RESP_EXP_BIT: 0)
/*b7 */ | ((flags & MCI_LONG_RESP) ? CMD_RESP_LENGTH_BIT: 0)
/*b8 | CMD_CHECK_CRC_BIT unused */
/*b9 */ | (TRANSFER_CMD ? CMD_DATA_EXP_BIT: 0)
/*b10 */ | ((cmd == SD_WRITE_MULTIPLE_BLOCK) ? CMD_RW_BIT: 0)
/*b11 | CMD_TRANSMODE_BIT unused */
/*b12 | CMD_SENT_AUTO_STOP_BIT unused */
/*b13 */ | ((cmd != SD_STOP_TRANSMISSION) ? CMD_WAIT_PRV_DAT_BIT: 0)
/*b14 | CMD_ABRT_CMD_BIT unused */
/*b15 */ | ((cmd == SD_GO_IDLE_STATE) ? CMD_SEND_INIT_BIT: 0)
/*b20:16 */ | card_no
/*b21 | CMD_SEND_CLK_ONLY unused */
/*b22 | CMD_READ_CEATA unused */
/*b23 | CMD_CCS_EXPECTED unused */
/*b31 */ | CMD_DONE_BIT;
semaphore_wait(&command_completion_signal, TIMEOUT_BLOCK);
/* Handle command responses & errors */
if(flags & MCI_RESP)
{
if(cmd_error & (MCI_INT_RCRC | MCI_INT_RTO))
return false;
if(flags & MCI_LONG_RESP)
{
response[0] = MCI_RESP3;
response[1] = MCI_RESP2;
response[2] = MCI_RESP1;
response[3] = MCI_RESP0;
}
else
response[0] = MCI_RESP0;
}
return true;
}
static int sd_wait_for_tran_state(const int drive)
{
unsigned long response;
unsigned int timeout = current_tick + 5*HZ;
int cmd_retry = 10;
while (1)
{
while (!send_cmd(drive, SD_SEND_STATUS, card_info[drive].rca, MCI_RESP,
&response) && cmd_retry > 0)
{
cmd_retry--;
}
if (cmd_retry <= 0)
return -1;
if (((response >> 9) & 0xf) == SD_TRAN)
return 0;
if(TIME_AFTER(current_tick, timeout))
return -10 * ((response >> 9) & 0xf);
last_disk_activity = current_tick;
}
}
static int sd_init_card(const int drive)
{
unsigned long response;
long init_timeout;
bool sd_v2 = false;
card_info[drive].rca = 0;
/* assume 24 MHz clock / 60 = 400 kHz */
MCI_CLKDIV = (MCI_CLKDIV & ~(0xFF)) | 0x3C; /* CLK_DIV_0 : bits 7:0 */
/* 100 - 400kHz clock required for Identification Mode */
/* Start of Card Identification Mode ************************************/
/* CMD0 Go Idle */
if(!send_cmd(drive, SD_GO_IDLE_STATE, 0, MCI_NO_RESP, NULL))
return -1;
mci_delay();
/* CMD8 Check for v2 sd card. Must be sent before using ACMD41
Non v2 cards will not respond to this command*/
if(send_cmd(drive, SD_SEND_IF_COND, 0x1AA, MCI_RESP, &response))
if((response & 0xFFF) == 0x1AA)
sd_v2 = true;
/* timeout for initialization is 1sec, from SD Specification 2.00 */
init_timeout = current_tick + HZ;
do {
/* this timeout is the only valid error for this loop*/
if(TIME_AFTER(current_tick, init_timeout))
return -2;
/* ACMD41 For v2 cards set HCS bit[30] & send host voltage range to all */
if(!send_cmd(drive, SD_APP_OP_COND, (0x00FF8000 | (sd_v2 ? 1<<30 : 0)),
MCI_ACMD|MCI_RESP, &card_info[drive].ocr))
return -3;
} while(!(card_info[drive].ocr & (1<<31)) );
/* CMD2 send CID */
if(!send_cmd(drive, SD_ALL_SEND_CID, 0, MCI_RESP|MCI_LONG_RESP, card_info[drive].cid))
return -4;
/* CMD3 send RCA */
if(!send_cmd(drive, SD_SEND_RELATIVE_ADDR, 0, MCI_RESP, &card_info[drive].rca))
return -5;
#ifdef HAVE_MULTIDRIVE
/* Make sure we have 2 unique rca numbers */
if(card_info[INTERNAL_AS3525].rca == card_info[SD_SLOT_AS3525].rca)
if(!send_cmd(drive, SD_SEND_RELATIVE_ADDR, 0, MCI_RESP, &card_info[drive].rca))
return -6;
#endif
/* End of Card Identification Mode ************************************/
/* Card back to full speed */
MCI_CLKDIV &= ~(0xFF); /* CLK_DIV_0 : bits 7:0 = 0x00 */
/* CMD9 send CSD */
if(!send_cmd(drive, SD_SEND_CSD, card_info[drive].rca,
MCI_RESP|MCI_LONG_RESP, card_info[drive].csd))
return -11;
sd_parse_csd(&card_info[drive]);
if(drive == INTERNAL_AS3525) /* The OF is stored in the first blocks */
card_info[INTERNAL_AS3525].numblocks -= AMS_OF_SIZE;
#ifndef BOOTLOADER
/* Switch to to 4 bit widebus mode */
/* CMD7 w/rca: Select card to put it in TRAN state */
if(!send_cmd(drive, SD_SELECT_CARD, card_info[drive].rca, MCI_RESP, &response))
return -12;
if(sd_wait_for_tran_state(drive) < 0)
return -13;
/* ACMD6: set bus width to 4-bit */
if(!send_cmd(drive, SD_SET_BUS_WIDTH, 2, MCI_ACMD|MCI_RESP, &response))
return -15;
/* ACMD42: disconnect the pull-up resistor on CD/DAT3 */
if(!send_cmd(drive, SD_SET_CLR_CARD_DETECT, 0, MCI_ACMD|MCI_RESP, &response))
return -17;
/* Now that card is widebus make controller aware */
#if defined(SANSA_FUZEV2) || defined(SANSA_CLIPPLUS) || defined(SANSA_CLIPZIP)
if (amsv2_variant == 1)
MCI_CTYPE |= 1<<1;
else
#endif
MCI_CTYPE |= (1<<drive);
#endif /* ! BOOTLOADER */
/* Set low power mode */
#if defined(SANSA_FUZEV2) || defined(SANSA_CLIPPLUS) || defined(SANSA_CLIPZIP)
if (amsv2_variant == 1)
MCI_CLKENA |= 1<<(1 + 16);
else
#endif
MCI_CLKENA |= 1<<(drive + 16);
card_info[drive].initialized = 1;
return 0;
}
static void sd_thread(void) NORETURN_ATTR;
static void sd_thread(void)
{
struct queue_event ev;
bool idle_notified = false;
while (1)
{
queue_wait_w_tmo(&sd_queue, &ev, HZ);
switch ( ev.id )
{
#ifdef HAVE_HOTSWAP
case SYS_HOTSWAP_INSERTED:
case SYS_HOTSWAP_EXTRACTED:
{
int changed = 1;
fat_lock(); /* lock-out FAT activity first -
prevent deadlocking via disk_mount that
would cause a reverse-order attempt with
another thread */
mutex_lock(&sd_mtx); /* lock-out card activity - direct calls
into driver that bypass the fat cache */
/* We now have exclusive control of fat cache and ata */
disk_unmount(SD_SLOT_AS3525); /* release "by force", ensure file
descriptors aren't leaked and any busy
ones are invalid if mounting */
/* Force card init for new card, re-init for re-inserted one or
* clear if the last attempt to init failed with an error. */
card_info[SD_SLOT_AS3525].initialized = 0;
if (ev.id == SYS_HOTSWAP_INSERTED)
{
sd_enable(true);
changed = (sd_init_card(SD_SLOT_AS3525) == 0) && disk_mount(SD_SLOT_AS3525); /* 0 if fail */
}
/*
* Mount succeeded, or this was an EXTRACTED event,
* in both cases notify the system about the changed filesystems
*/
if (changed)
queue_broadcast(SYS_FS_CHANGED, 0);
sd_enable(false);
/* Access is now safe */
mutex_unlock(&sd_mtx);
fat_unlock();
}
break;
#endif
case SYS_TIMEOUT:
if (TIME_BEFORE(current_tick, last_disk_activity+(3*HZ)))
{
idle_notified = false;
}
else if (!idle_notified)
{
call_storage_idle_notifys(false);
idle_notified = true;
}
break;
case SYS_USB_CONNECTED:
usb_acknowledge(SYS_USB_CONNECTED_ACK);
/* Wait until the USB cable is extracted again */
usb_wait_for_disconnect(&sd_queue);
break;
}
}
}
static void init_controller(void)
{
int hcon_numcards = ((MCI_HCON>>1) & 0x1F) + 1;
int card_mask = (1 << hcon_numcards) - 1;
int pwr_mask;
#if defined(SANSA_FUZEV2) || defined(SANSA_CLIPPLUS) || defined(SANSA_CLIPZIP)
if (amsv2_variant == 1)
pwr_mask = 1 << 1;
else
#endif
pwr_mask = card_mask;
MCI_PWREN &= ~pwr_mask; /* power off all cards */
MCI_PWREN = pwr_mask; /* power up cards */
MCI_CTRL |= CTRL_RESET;
while(MCI_CTRL & CTRL_RESET)
;
MCI_RAW_STATUS = 0xffffffff; /* Clear all MCI Interrupts */
MCI_TMOUT = 0xffffffff; /* data b31:8, response b7:0 */
MCI_CTYPE = 0x0; /* all cards 1 bit bus for now */
MCI_CLKENA = card_mask; /* Enables card clocks */
MCI_ARGUMENT = 0;
MCI_COMMAND = CMD_DONE_BIT|CMD_SEND_CLK_ONLY|CMD_WAIT_PRV_DAT_BIT;
while(MCI_COMMAND & CMD_DONE_BIT)
;
MCI_DEBNCE = 0xfffff; /* default value */
/* Rx watermark = 63(sd reads) Tx watermark = 128 (sd writes) */
MCI_FIFOTH = (MCI_FIFOTH & MCI_FIFOTH_MASK) | 0x503f0080;
/* RCRC & RTO interrupts should be set together with the CD interrupt but
* in practice sometimes incorrectly precede the CD interrupt. If we leave
* them masked for now we can check them in the isr by reading raw status when
* the CD int is triggered.
*/
MCI_MASK |= (MCI_DATA_ERROR | MCI_INT_DTO | MCI_INT_CD);
MCI_CTRL |= INT_ENABLE | DMA_ENABLE;
MCI_BLKSIZ = SD_BLOCK_SIZE;
}
int sd_init(void)
{
int ret;
bitset32(&CGU_PERI, CGU_MCI_CLOCK_ENABLE);
CGU_IDE = (1<<7) /* AHB interface enable */
| (AS3525_IDE_DIV << 2)
| 1; /* clock source = PLLA */
CGU_MEMSTICK = (1<<7) /* interface enable */
| (AS3525_MS_DIV << 2)
| 1; /* clock source = PLLA */
CGU_SDSLOT = (1<<7) /* interface enable */
| (AS3525_SDSLOT_DIV << 2)
| 1; /* clock source = PLLA */
semaphore_init(&transfer_completion_signal, 1, 0);
semaphore_init(&command_completion_signal, 1, 0);
#if defined(SANSA_FUZEV2) || defined(SANSA_CLIPPLUS) || defined(SANSA_CLIPZIP)
if (amsv2_variant == 1)
GPIOB_DIR |= 1 << 5;
#endif
#ifdef HAVE_MULTIDRIVE
/* clear previous irq */
GPIOA_IC = EXT_SD_BITS;
/* enable edge detecting */
GPIOA_IS &= ~EXT_SD_BITS;
/* detect both raising and falling edges */
GPIOA_IBE |= EXT_SD_BITS;
/* enable the card detect interrupt */
GPIOA_IE |= EXT_SD_BITS;
#endif /* HAVE_MULTIDRIVE */
#ifndef SANSA_CLIPV2
/* Configure XPD for SD-MCI interface */
bitmod32(&CCU_IO, 1<<2, 3<<2);
#endif
VIC_INT_ENABLE = INTERRUPT_NAND;
init_controller();
ret = sd_init_card(INTERNAL_AS3525);
if(ret < 0)
return ret;
/* init mutex */
mutex_init(&sd_mtx);
queue_init(&sd_queue, true);
create_thread(sd_thread, sd_stack, sizeof(sd_stack), 0,
sd_thread_name IF_PRIO(, PRIORITY_USER_INTERFACE) IF_COP(, CPU));
#ifndef BOOTLOADER
sd_enabled = true;
sd_enable(false);
#endif
return 0;
}
static int sd_transfer_sectors(IF_MD2(int drive,) unsigned long start,
int count, void* buf, bool write)
{
unsigned long response;
int ret = 0;
#ifndef HAVE_MULTIDRIVE
const int drive = 0;
#endif
bool aligned = !((uintptr_t)buf & (CACHEALIGN_SIZE - 1));
int const retry_all_max = 1;
int retry_all = 0;
int const retry_data_max = 100; /* Generous, methinks */
int retry_data;
unsigned int real_numblocks;
mutex_lock(&sd_mtx);
#ifndef BOOTLOADER
sd_enable(true);
led(true);
#endif
if(count < 0) /* XXX: why is it signed ? */
{
ret = -18;
goto sd_transfer_error_no_dma;
}
/* skip SanDisk OF */
if (drive == INTERNAL_AS3525)
start += AMS_OF_SIZE;
/* no need for complete retry on main, just SD */
if (drive == SD_SLOT_AS3525)
retry_all = retry_all_max;
sd_transfer_retry_with_reinit:
if (card_info[drive].initialized <= 0)
{
ret = sd_init_card(drive);
if (!(card_info[drive].initialized))
goto sd_transfer_error_no_dma;
}
/* Check the real block size after the card has been initialized */
real_numblocks = card_info[drive].numblocks;
/* 'start' represents the real (physical) starting sector
* so we must compare it to the real (physical) number of sectors */
if (drive == INTERNAL_AS3525)
real_numblocks += AMS_OF_SIZE;
if ((start+count) > real_numblocks)
{
ret = -19;
goto sd_transfer_error_no_dma;
}
/* CMD7 w/rca: Select card to put it in TRAN state */
if(!send_cmd(drive, SD_SELECT_CARD, card_info[drive].rca, MCI_NO_RESP, NULL))
{
ret = -20;
goto sd_transfer_error_no_dma;
}
dma_retain();
if(aligned)
{ /* direct transfer, indirect is always uncached */
if(write)
commit_dcache_range(buf, count * SECTOR_SIZE);
else
discard_dcache_range(buf, count * SECTOR_SIZE);
}
const int cmd = write ? SD_WRITE_MULTIPLE_BLOCK : SD_READ_MULTIPLE_BLOCK;
retry_data = retry_data_max;
while (1)
{
void *dma_buf;
unsigned int transfer = count;
last_disk_activity = current_tick;
if(aligned)
{
dma_buf = AS3525_PHYSICAL_ADDR(buf);
}
else
{
dma_buf = AS3525_PHYSICAL_ADDR(&aligned_buffer[0]);
if(transfer > UNALIGNED_NUM_SECTORS)
transfer = UNALIGNED_NUM_SECTORS;
if(write)
memcpy(uncached_buffer, buf, transfer * SD_BLOCK_SIZE);
}
/* Interrupt handler might set this to true during transfer */
retry = false;
MCI_BYTCNT = transfer * SD_BLOCK_SIZE;
ret = sd_wait_for_tran_state(drive);
if (ret < 0)
{
ret -= 25;
goto sd_transfer_error;
}
int arg = start;
if(!(card_info[drive].ocr & (1<<30))) /* not SDHC */
arg *= SD_BLOCK_SIZE;
if(write)
dma_enable_channel(1, dma_buf, MCI_FIFO, DMA_PERI_SD,
DMAC_FLOWCTRL_PERI_MEM_TO_PERI, true, false, 0, DMA_S8, NULL);
else
dma_enable_channel(1, MCI_FIFO, dma_buf, DMA_PERI_SD,
DMAC_FLOWCTRL_PERI_PERI_TO_MEM, false, true, 0, DMA_S8, NULL);
if(!send_cmd(drive, cmd, arg, MCI_RESP, &response))
{
ret = -21;
goto sd_transfer_error;
}
semaphore_wait(&transfer_completion_signal, TIMEOUT_BLOCK);
last_disk_activity = current_tick;
if(write)
{
/* wait for the card to exit programming state */
while(MCI_STATUS & DATA_BUSY) ;
}
if(!send_cmd(drive, SD_STOP_TRANSMISSION, 0, MCI_RESP, &response))
{
ret = -22;
goto sd_transfer_error;
}
if(!retry)
{
if(!write && !aligned)
memcpy(buf, uncached_buffer, transfer * SD_BLOCK_SIZE);
buf += transfer * SD_BLOCK_SIZE;
start += transfer;
count -= transfer;
if (count > 0)
continue;
}
else /* reset controller if we had an error */
{
MCI_CTRL |= (FIFO_RESET|DMA_RESET);
while(MCI_CTRL & (FIFO_RESET|DMA_RESET))
;
if (--retry_data >= 0)
continue;
}
break;
}
dma_release();
/* CMD lines are separate, not common, so we need to actively deselect */
/* CMD7 w/rca =0 : deselects card & puts it in STBY state */
if(!send_cmd(drive, SD_DESELECT_CARD, 0, MCI_NO_RESP, NULL))
{
ret = -23;
goto sd_transfer_error;
}
while (1)
{
#ifndef BOOTLOADER
sd_enable(false);
led(false);
#endif
mutex_unlock(&sd_mtx);
return ret;
sd_transfer_error:
dma_release();
sd_transfer_error_no_dma:
card_info[drive].initialized = 0;
/* .initialized might have been >= 0 but now stale if the ata sd thread
* isn't handling an insert because of USB */
if (--retry_all >= 0)
goto sd_transfer_retry_with_reinit;
}
}
int sd_read_sectors(IF_MD2(int drive,) unsigned long start, int count,
void* buf)
{
return sd_transfer_sectors(IF_MD2(drive,) start, count, buf, false);
}
int sd_write_sectors(IF_MD2(int drive,) unsigned long start, int count,
const void* buf)
{
return sd_transfer_sectors(IF_MD2(drive,) start, count, (void*)buf, true);
}
#ifndef BOOTLOADER
long sd_last_disk_activity(void)
{
return last_disk_activity;
}
void sd_enable(bool on)
{
if (on)
{
bitset32(&CGU_PERI, CGU_MCI_CLOCK_ENABLE);
CGU_IDE |= (1<<7); /* AHB interface enable */
CGU_MEMSTICK |= (1<<7); /* interface enable */
CGU_SDSLOT |= (1<<7); /* interface enable */
}
else
{
CGU_SDSLOT &= ~(1<<7); /* interface enable */
CGU_MEMSTICK &= ~(1<<7); /* interface enable */
CGU_IDE &= ~(1<<7); /* AHB interface enable */
bitclr32(&CGU_PERI, CGU_MCI_CLOCK_ENABLE);
}
}
#endif /* BOOTLOADER */
tCardInfo *card_get_info_target(int card_no)
{
return &card_info[card_no];
}
#ifdef HAVE_HOTSWAP
bool sd_removable(IF_MD_NONVOID(int drive))
{
return (drive == SD_SLOT_AS3525);
}
bool sd_present(IF_MD_NONVOID(int drive))
{
return (drive == INTERNAL_AS3525) ? true : card_detect_target();
}
static int sd1_oneshot_callback(struct timeout *tmo)
{
(void)tmo;
/* This is called only if the state was stable for 300ms - check state
* and post appropriate event. */
if (card_detect_target())
{
queue_broadcast(SYS_HOTSWAP_INSERTED, 0);
}
else
queue_broadcast(SYS_HOTSWAP_EXTRACTED, 0);
return 0;
}
void sd_gpioa_isr(void)
{
static struct timeout sd1_oneshot;
if (GPIOA_MIS & EXT_SD_BITS)
{
timeout_register(&sd1_oneshot, sd1_oneshot_callback, (3*HZ/10), 0);
GPIOA_IC = EXT_SD_BITS; /* acknowledge interrupt */
}
}
#endif /* HAVE_HOTSWAP */
#ifdef CONFIG_STORAGE_MULTI
int sd_num_drives(int first_drive)
{
/* We don't care which logical drive number(s) we have been assigned */
(void)first_drive;
return NUM_DRIVES;
}
#endif /* CONFIG_STORAGE_MULTI */
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