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arm:mmc driver small cleanup.

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This commit is contained in:
Kees Jongenburger 2013-10-16 09:23:00 +02:00
parent 401bad1a4d
commit 8ce3150cd6
4 changed files with 100 additions and 34 deletions
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27
drivers/mmc/mmchost.h
View File

@ -39,28 +39,27 @@ struct mmc_host;
struct sd_card_regs
{
uint32_t cid[4]; /* Card Identification */
uint32_t rca; /* Relative card address */
uint32_t dsr; /* Driver stage register */
uint32_t csd[4]; /* Card specific data */
uint32_t scr[2]; /* SD configuration */
uint32_t ocr; /* Operation conditions */
uint32_t ssr[5]; /* SD Status */
uint32_t csr; /* Card status */
uint32_t cid[4]; /* Card Identification */
uint32_t rca; /* Relative card address */
uint32_t dsr; /* Driver stage register */
uint32_t csd[4]; /* Card specific data */
uint32_t scr[2]; /* SD configuration */
uint32_t ocr; /* Operation conditions */
uint32_t ssr[5]; /* SD Status */
uint32_t csr; /* Card status */
};
#define RESP_LEN_48_CHK_BUSY (3<<0)
#define RESP_LEN_48 (2<<0)
#define RESP_LEN_136 (1<<0)
#define NO_RESPONSE (0<<0)
/* struct representing an mmc command */
struct mmc_command
{
uint32_t cmd;
uint32_t args;
uint32_t resp_type;
#define RESP_LEN_48_CHK_BUSY (3<<0)
#define RESP_LEN_48 (2<<0)
#define RESP_LEN_136 (1<<0)
#define NO_RESPONSE (0<<0)
uint32_t resp[4];
unsigned char *data;
uint32_t data_len;

103
drivers/mmc/mmchost_mmchs.c
View File

@ -43,6 +43,11 @@ static int hook_id = 1;
#define SANE_TIMEOUT 500000 /* 500 ms */
/* Integer divide x by y and ensure that the result z is
* such that x / z is smaller or equal y
*/
#define div_roundup(x, y) (((x)+((y)-1))/(y))
/*
* Define a structure to be used for logging
*/
@ -52,8 +57,33 @@ static struct log log = {
.log_func = default_log
};
/**
* MMC use memory mapped IO and base_address is the
* base address for the controller in use.
*/
static uint32_t base_address;
#define HSMMCSD_0_IN_FREQ 96000000 /* 96MHz */
#define HSMMCSD_0_INIT_FREQ 400000 /* 400kHz */
#define HSMMCSD_0_FREQ_25MHZ 25000000 /* 25MHz */
#define HSMMCSD_0_FREQ_50MHZ 50000000 /* 50MHz */
int
mmchs_set_bus_freq(u32_t freq)
{
u32_t freq_in = HSMMCSD_0_IN_FREQ;
u32_t freq_out = freq;
/* Calculate and program the divisor */
u32_t clkd = div_roundup(freq_in,freq_out);
clkd = (clkd < 2) ? 2 : clkd;
clkd = (clkd > 1023) ? 1023 : clkd;
log_debug(&log,"Setting divider to %d\n",clkd);
set32(base_address + MMCHS_SD_SYSCTL, MMCHS_SD_SYSCTL_CLKD,
(clkd << 6));
}
/*
* Initialize the MMC controller given a certain
* instance. this driver only handles a single
@ -69,19 +99,24 @@ mmchs_init(uint32_t instance)
spin_t spin;
mr.mr_base = MMCHS1_REG_BASE;
mr.mr_limit = MMCHS1_REG_BASE + 0x400;
mr.mr_limit = MMCHS1_REG_BASE + MMCHS1_REG_BASE_SIZE;
/* grant ourself rights to map the register memory */
if (sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mr) != 0) {
panic("Unable to request permission to map memory");
}
/* Set the base address to use */
base_address =
(uint32_t) vm_map_phys(SELF, (void *) MMCHS1_REG_BASE, 0x400);
(uint32_t) vm_map_phys(SELF, (void *) MMCHS1_REG_BASE, MMCHS1_REG_BASE_SIZE);
if (base_address == (uint32_t) MAP_FAILED)
panic("Unable to map MMC memory");
#ifdef DM37XX
/* DM and AM have the same register but shifted by 0x100. instead of redefining the registers
* we simply move the start offset
*/
base_address = (unsigned long) base_address - 0x100;
#endif
@ -139,7 +174,8 @@ mmchs_init(uint32_t instance)
* MMC host and bus configuration
*/
/* Configure data and command transfer (1 bit mode) */
/* Configure data and command transfer (1 bit mode) switching
* to higher bit modes happens after a card is detected */
set32(base_address + MMCHS_SD_CON, MMCHS_SD_CON_DW8,
MMCHS_SD_CON_DW8_1BIT);
set32(base_address + MMCHS_SD_HCTL, MMCHS_SD_HCTL_DTW,
@ -154,7 +190,6 @@ mmchs_init(uint32_t instance)
set32(base_address + MMCHS_SD_HCTL, MMCHS_SD_HCTL_SDBP,
MMCHS_SD_HCTL_SDBP_ON);
// /* TODO: Add padconf/pinmux stuff here as documented in the TRM */
spin_init(&spin, SANE_TIMEOUT);
while ((read32(base_address + MMCHS_SD_HCTL) & MMCHS_SD_HCTL_SDBP)
!= MMCHS_SD_HCTL_SDBP_ON) {
@ -168,12 +203,8 @@ mmchs_init(uint32_t instance)
set32(base_address + MMCHS_SD_SYSCTL, MMCHS_SD_SYSCTL_ICE,
MMCHS_SD_SYSCTL_ICE_EN);
// @TODO Fix external clock enable , this one is very slow
// but we first need faster context switching
// set32(base_address + MMCHS_SD_SYSCTL, MMCHS_SD_SYSCTL_CLKD,
// (0x20 << 6));
set32(base_address + MMCHS_SD_SYSCTL, MMCHS_SD_SYSCTL_CLKD,
(0x2 << 6));
mmchs_set_bus_freq(HSMMCSD_0_INIT_FREQ);
set32(base_address + MMCHS_SD_SYSCTL, MMCHS_SD_SYSCTL_CEN,
MMCHS_SD_SYSCTL_CEN_EN);
@ -247,7 +278,7 @@ mmchs_init(uint32_t instance)
#ifdef USE_INTR
hook_id = 1;
if (sys_irqsetpolicy(OMAP3_MMC1_IRQ, 0, &hook_id) != OK) {
printf("mmc: couldn't set IRQ policy %d\n", OMAP3_MMC1_IRQ);
log_warn(&log,"mmc: couldn't set IRQ policy %d\n", OMAP3_MMC1_IRQ);
return 1;
}
/* enable signaling from MMC controller towards interrupt controller */
@ -280,7 +311,7 @@ handle_bwr()
/* handle buffer write ready interrupts. These happen in a non
* predictable way (eg. we send a request but don't know if we are
* first doing to get a request completed before we are allowed to
* send the data to the harware or not */
* send the data to the hardware or not */
uint32_t value;
uint32_t count;
assert(read32(base_address +
@ -392,7 +423,7 @@ intr_wait(int mask)
/* this is the normal return
* path, the mask given
* matches the pending
* interrupt. canel the alarm
* interrupt. cancel the alarm
* and return */
sys_setalarm(0, 0);
return 0;
@ -415,14 +446,14 @@ intr_wait(int mask)
break;
default:
/*
* unhandled message. queue it and
* unhandled notify message. Queue it and
* handle it in the blockdriver loop.
*/
blockdriver_mq_queue(&m, ipc_status);
}
} else {
/*
* unhandled message. queue it and handle it in the
* unhandled message. Queue it and handle it in the
* blockdriver loop.
*/
blockdriver_mq_queue(&m, ipc_status);
@ -698,7 +729,7 @@ card_query_voltage_and_type(struct sd_card_regs *card)
if (mmc_send_app_cmd(card, &command)) {
return 1;
}
/* @todo wait for max 1 ms */
spin_init(&spin, SANE_TIMEOUT);
while (!(command.resp[0] & MMC_OCR_MEM_READY)) {
@ -790,9 +821,6 @@ card_csd(struct sd_card_regs *card)
return 1;
}
/* sanity check */
// log_warn(&log,"size = %llu bytes\n", (long long
// unsigned)SD_CSD_V2_CAPACITY( card->csd) * 512);
return 0;
}
@ -836,7 +864,7 @@ card_scr(struct sd_card_regs *card)
p = (uint8_t *) card->scr;
/* hussle */
/* copy the data to card->scr */
for (c = 7; c >= 0; c--) {
*p++ = buffer[c];
}
@ -875,7 +903,35 @@ enable_4bit_mode(struct sd_card_regs *card)
/* now configure the controller to use 4 bit access */
set32(base_address + MMCHS_SD_HCTL, MMCHS_SD_HCTL_DTW,
MMCHS_SD_HCTL_DTW_4BIT);
return 0;
}
return 1; /* expect 4 bits mode to work so having a card
that doesn't support 4 bits mode */
}
int
enable_high_speed_mode(struct sd_card_regs *card)
{
/* MMC cards using version 4.0 or higher of the specs can work
* at higher bus rates. After setting the bus width one can
* send the HS_TIMING command to set the card in high speed
* mode after witch one can higher up the frequency
*/
log_info(&log,
"Enabling high speed mode\n");
if (SD_CSD_SPEED(card->csd) == SD_CSD_SPEED_25_MHZ) {
log_trace(&log,
"Using 25MHz clock\n");
mmchs_set_bus_freq(HSMMCSD_0_FREQ_25MHZ);
} else if (SD_CSD_SPEED(card->csd) == SD_CSD_SPEED_50_MHZ) {
log_trace(&log,
"Using 50MHz clock\n");
mmchs_set_bus_freq(HSMMCSD_0_FREQ_50MHZ);
} else {
log_warn(&log,"Unknown speed 0x%x in CSD register\n",SD_CSD_SPEED(card->csd));
}
return 0;
}
@ -983,6 +1039,7 @@ mmchs_card_initialize(struct sd_slot *slot)
log_warn(&log, "Failed to do card_query_voltage_and_type\n");
return NULL;
}
if (card_identify(&slot->card.regs)) {
log_warn(&log, "Failed to identify card\n");
return NULL;
@ -1009,6 +1066,11 @@ mmchs_card_initialize(struct sd_slot *slot)
return NULL;
}
if(enable_high_speed_mode(&slot->card.regs)){
log_warn(&log, "failed to configure high speed mode mode\n");
return NULL;
}
if (SD_CSD_READ_BL_LEN(slot->card.regs.csd) != 0x09) {
/* for CSD version 2.0 the value is fixed to 0x09 and means a
* block size of 512 */
@ -1020,6 +1082,7 @@ mmchs_card_initialize(struct sd_slot *slot)
slot->card.blk_count = SD_CSD_V2_CAPACITY(slot->card.regs.csd);
slot->card.state = SD_MODE_DATA_TRANSFER_MODE;
/* MINIX related stuff to keep track of partitions */
memset(slot->card.part, 0, sizeof(slot->card.part));
memset(slot->card.subpart, 0, sizeof(slot->card.subpart));
slot->card.part[0].dv_base = 0;

3
drivers/mmc/omap_mmc.h
View File

@ -8,6 +8,9 @@
#ifdef DM37XX
#define MMCHS1_REG_BASE 0x4809C000
#endif
/* The size of the memory mapped register */
#define MMCHS1_REG_BASE_SIZE 0x2ff
//#define MMCHS2_REG_BASE 0x480B4000
//#define MMCHS3_REG_BASE 0x480AD000
//#endif

1
drivers/mmc/sdmmcreg.h
View File

@ -308,6 +308,7 @@
#define SCR_SD_BUS_WIDTHS(scr) MMC_RSP_BITS((scr), 48, 4)
#define SCR_SD_BUS_WIDTHS_1BIT (1 << 0) /* 1bit (DAT0) */
#define SCR_SD_BUS_WIDTHS_4BIT (1 << 2) /* 4bit (DAT0-3) */
#define SCR_SD_SPEC3(scr) MMC_RSP_BITS((scr), 47, 1)
#define SCR_RESERVED(scr) MMC_RSP_BITS((scr), 32, 16)
#define SCR_RESERVED2(scr) MMC_RSP_BITS((scr), 0, 32)