diff options
| -rw-r--r-- | arch/arm/cpu/arm926ejs/at91/at91sam9260_devices.c | 21 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-at91/at91_common.h | 1 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-at91/clk.h | 5 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-at91/hardware.h | 1 | ||||
| -rw-r--r-- | doc/README.atmel_mci | 86 | ||||
| -rw-r--r-- | drivers/mmc/Makefile | 5 | ||||
| -rw-r--r-- | drivers/mmc/atmel_mci.h | 48 | ||||
| -rw-r--r-- | drivers/mmc/gen_atmel_mci.c | 353 | ||||
| -rw-r--r-- | include/mmc.h | 15 |
9 files changed, 530 insertions, 5 deletions
diff --git a/arch/arm/cpu/arm926ejs/at91/at91sam9260_devices.c b/arch/arm/cpu/arm926ejs/at91/at91sam9260_devices.c index 77d49ab..2d88481 100644 --- a/arch/arm/cpu/arm926ejs/at91/at91sam9260_devices.c +++ b/arch/arm/cpu/arm926ejs/at91/at91sam9260_devices.c @@ -194,3 +194,24 @@ void at91_macb_hw_init(void) #endif } #endif + +#if defined(CONFIG_ATMEL_MCI) || defined(CONFIG_GENERIC_ATMEL_MCI) +void at91_mci_hw_init(void) +{ + at91_set_a_periph(AT91_PIO_PORTA, 8, 1); /* MCCK */ +#if defined(CONFIG_ATMEL_MCI_PORTB) + at91_set_b_periph(AT91_PIO_PORTA, 1, 1); /* MCCDB */ + at91_set_b_periph(AT91_PIO_PORTA, 0, 1); /* MCDB0 */ + at91_set_b_periph(AT91_PIO_PORTA, 5, 1); /* MCDB1 */ + at91_set_b_periph(AT91_PIO_PORTA, 4, 1); /* MCDB2 */ + at91_set_b_periph(AT91_PIO_PORTA, 3, 1); /* MCDB3 */ +#else + at91_set_a_periph(AT91_PIO_PORTA, 7, 1); /* MCCDA */ + at91_set_a_periph(AT91_PIO_PORTA, 6, 1); /* MCDA0 */ + at91_set_a_periph(AT91_PIO_PORTA, 9, 1); /* MCDA1 */ + at91_set_a_periph(AT91_PIO_PORTA, 10, 1); /* MCDA2 */ + at91_set_a_periph(AT91_PIO_PORTA, 11, 1); /* MCDA3 */ +#endif +} +#endif + diff --git a/arch/arm/include/asm/arch-at91/at91_common.h b/arch/arm/include/asm/arch-at91/at91_common.h index 01840ee..0067190 100644 --- a/arch/arm/include/asm/arch-at91/at91_common.h +++ b/arch/arm/include/asm/arch-at91/at91_common.h @@ -27,6 +27,7 @@ void at91_can_hw_init(void); void at91_macb_hw_init(void); +void at91_mci_hw_init(void); void at91_serial_hw_init(void); void at91_serial0_hw_init(void); void at91_serial1_hw_init(void); diff --git a/arch/arm/include/asm/arch-at91/clk.h b/arch/arm/include/asm/arch-at91/clk.h index f642dd9..457e6c9 100644 --- a/arch/arm/include/asm/arch-at91/clk.h +++ b/arch/arm/include/asm/arch-at91/clk.h @@ -59,5 +59,10 @@ static inline unsigned long get_twi_clk_rate(unsigned int dev_id) return get_mck_clk_rate(); } +static inline unsigned long get_mci_clk_rate(void) +{ + return get_mck_clk_rate(); +} + int at91_clock_init(unsigned long main_clock); #endif /* __ASM_ARM_ARCH_CLK_H__ */ diff --git a/arch/arm/include/asm/arch-at91/hardware.h b/arch/arm/include/asm/arch-at91/hardware.h index 4ddb315..9f732a7 100644 --- a/arch/arm/include/asm/arch-at91/hardware.h +++ b/arch/arm/include/asm/arch-at91/hardware.h @@ -20,6 +20,7 @@ #include <asm/arch-at91/at91rm9200.h> #elif defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9G20) #include <asm/arch/at91sam9260.h> +#define AT91_BASE_MCI AT91SAM9260_BASE_MCI #define AT91_BASE_SPI AT91SAM9260_BASE_SPI0 #define AT91_ID_UHP AT91SAM9260_ID_UHP #define AT91_PMC_UHP AT91SAM926x_PMC_UHP diff --git a/doc/README.atmel_mci b/doc/README.atmel_mci new file mode 100644 index 0000000..18b1bdf --- /dev/null +++ b/doc/README.atmel_mci @@ -0,0 +1,86 @@ +How to use SD/MMC cards with Atmel SoCs having MCI hardware +----------------------------------------------------------- +2010-08-16 Reinhard Meyer <reinhard.meyer@emk-elektronik.de> + +This is a new approach to use Atmel MCI hardware with the +general MMC framework. Therefore it benefits from that +framework's abilities to handle SDHC Cards and the ability +to write blocks. + +- AT91SAM9XE512 (tested, will definitely work with XE128 and XE256) +- AT91SAM9260 (not tested, but MCI is to AT91SAM9XE) +- AT91SAM9G20 (not tested, should work) + +It should work with all other ATMEL devices that have MCI, +including AVR32. + +The generic driver does NOT assign port pins to the MCI block +nor does it start the MCI clock. This has to be handled in a +board/SoC specific manner before the driver is initialized: + +example: this is added to at91sam9260_devices.c: + +#if defined(CONFIG_ATMEL_MCI) || defined(CONFIG_GENERIC_ATMEL_MCI) +void at91_mci_hw_init(void) +{ + at91_set_a_periph(AT91_PIO_PORTA, 8, PUP); /* MCCK */ +#if defined(CONFIG_ATMEL_MCI_PORTB) + at91_set_b_periph(AT91_PIO_PORTA, 1, PUP); /* MCCDB */ + at91_set_b_periph(AT91_PIO_PORTA, 0, PUP); /* MCDB0 */ + at91_set_b_periph(AT91_PIO_PORTA, 5, PUP); /* MCDB1 */ + at91_set_b_periph(AT91_PIO_PORTA, 4, PUP); /* MCDB2 */ + at91_set_b_periph(AT91_PIO_PORTA, 3, PUP); /* MCDB3 */ +#else + at91_set_a_periph(AT91_PIO_PORTA, 7, PUP); /* MCCDA */ + at91_set_a_periph(AT91_PIO_PORTA, 6, PUP); /* MCDA0 */ + at91_set_a_periph(AT91_PIO_PORTA, 9, PUP); /* MCDA1 */ + at91_set_a_periph(AT91_PIO_PORTA, 10, PUP); /* MCDA2 */ + at91_set_a_periph(AT91_PIO_PORTA, 11, PUP); /* MCDA3 */ +#endif +} +#endif + +the board specific file need added: +... +#ifdef CONFIG_GENERIC_ATMEL_MCI +# include <mmc.h> +#endif +... +#ifdef CONFIG_GENERIC_ATMEL_MCI +/* this is a weak define that we are overriding */ +int board_mmc_init(bd_t *bd) +{ + /* Enable clock */ + at91_sys_write(AT91_PMC_PCER, 1 << AT91SAM9260_ID_MCI); + at91_mci_hw_init(); + + /* This calls the atmel_mci_init in gen_atmel_mci.c */ + return atmel_mci_init((void *)AT91_BASE_MCI); +} + +/* this is a weak define that we are overriding */ +int board_mmc_getcd(u8 *cd, struct mmc *mmc) +{ + /* + * the only currently existing use of this function + * (fsl_esdhc.c) suggests this function must return + * *cs = TRUE if a card is NOT detected -> in most + * cases the value of the pin when the detect switch + * closes to GND + */ + *cd = at91_get_gpio_value (CONFIG_SYS_MMC_CD_PIN) ? 1 : 0; + return 0; +} + +#endif + +and the board definition files needs: + +/* SD/MMC card */ +#define CONFIG_MMC 1 +#define CONFIG_GENERIC_MMC 1 +#define CONFIG_GENERIC_ATMEL_MCI 1 +#define CONFIG_ATMEL_MCI_PORTB 1 /* Atmel XE-EK uses port B */ +#define CONFIG_SYS_MMC_CD_PIN AT91_PIN_PC9 +#define CONFIG_CMD_MMC 1 + diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile index 8dfd8a3..6603d74 100644 --- a/drivers/mmc/Makefile +++ b/drivers/mmc/Makefile @@ -25,12 +25,13 @@ include $(TOPDIR)/config.mk LIB := $(obj)libmmc.a -COBJS-$(CONFIG_GENERIC_MMC) += mmc.o COBJS-$(CONFIG_ATMEL_MCI) += atmel_mci.o COBJS-$(CONFIG_BFIN_SDH) += bfin_sdh.o -COBJS-$(CONFIG_OMAP3_MMC) += omap3_mmc.o COBJS-$(CONFIG_FSL_ESDHC) += fsl_esdhc.o +COBJS-$(CONFIG_GENERIC_MMC) += mmc.o +COBJS-$(CONFIG_GENERIC_ATMEL_MCI) += gen_atmel_mci.o COBJS-$(CONFIG_MXC_MMC) += mxcmmc.o +COBJS-$(CONFIG_OMAP3_MMC) += omap3_mmc.o COBJS-$(CONFIG_PXA_MMC) += pxa_mmc.o COBJS-$(CONFIG_S5P_MMC) += s5p_mmc.o diff --git a/drivers/mmc/atmel_mci.h b/drivers/mmc/atmel_mci.h index 5b4f5c9..823a77d 100644 --- a/drivers/mmc/atmel_mci.h +++ b/drivers/mmc/atmel_mci.h @@ -22,7 +22,45 @@ #ifndef __CPU_AT32AP_ATMEL_MCI_H__ #define __CPU_AT32AP_ATMEL_MCI_H__ -/* Atmel MultiMedia Card Interface (MCI) registers */ +#ifndef __ASSEMBLY__ + +/* + * Structure for struct SoC access. + * Names starting with '_' are fillers. + */ +typedef struct atmel_mci { + /* reg Offset */ + u32 cr; /* 0x00 */ + u32 mr; /* 0x04 */ + u32 dtor; /* 0x08 */ + u32 sdcr; /* 0x0c */ + u32 argr; /* 0x10 */ + u32 cmdr; /* 0x14 */ + u32 _18; /* 0x18 */ + u32 _1c; /* 0x1c */ + u32 rspr; /* 0x20 */ + u32 rspr1; /* 0x24 */ + u32 rspr2; /* 0x28 */ + u32 rspr3; /* 0x2c */ + u32 rdr; /* 0x30 */ + u32 tdr; /* 0x34 */ + u32 _38; /* 0x38 */ + u32 _3c; /* 0x3c */ + u32 sr; /* 0x40 */ + u32 ier; /* 0x44 */ + u32 idr; /* 0x48 */ + u32 imr; /* 0x4c */ +} atmel_mci_t; + +#endif /* __ASSEMBLY__ */ + +/* + * NOTICE: Use of registers offsets is depreciated. + * These defines will be removed once the old driver + * is taken out of commision. + * + * Atmel MultiMedia Card Interface (MCI) registers + */ #define MMCI_CR 0x0000 #define MMCI_MR 0x0004 #define MMCI_DTOR 0x0008 @@ -192,7 +230,13 @@ << MMCI_##name##_OFFSET)) \ | MMCI_BF(name,value)) -/* Register access macros */ +/* + * NOTICE: Use of registers offsets is depreciated. + * These defines will be removed once the old driver + * is taken out of commision. + * + * Register access macros + */ #define mmci_readl(reg) \ readl((void *)MMCI_BASE + MMCI_##reg) #define mmci_writel(reg,value) \ diff --git a/drivers/mmc/gen_atmel_mci.c b/drivers/mmc/gen_atmel_mci.c new file mode 100644 index 0000000..fa4df99 --- /dev/null +++ b/drivers/mmc/gen_atmel_mci.c @@ -0,0 +1,353 @@ +/* + * Copyright (C) 2010 + * Rob Emanuele <rob@emanuele.us> + * Reinhard Meyer, EMK Elektronik <reinhard.meyer@emk-elektronik.de> + * + * Original Driver: + * Copyright (C) 2004-2006 Atmel Corporation + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <mmc.h> +#include <part.h> +#include <malloc.h> +#include <asm/io.h> +#include <asm/errno.h> +#include <asm/byteorder.h> +#include <asm/arch/clk.h> +#include <asm/arch/memory-map.h> +#include "atmel_mci.h" + +#ifndef CONFIG_SYS_MMC_CLK_OD +# define CONFIG_SYS_MMC_CLK_OD 150000 +#endif + +#define MMC_DEFAULT_BLKLEN 512 + +#if defined(CONFIG_ATMEL_MCI_PORTB) +# define MCI_BUS 1 +#else +# define MCI_BUS 0 +#endif + +static int initialized = 0; + +/* + * Print command and status: + * + * - always when DEBUG is defined + * - on command errors + */ +static void dump_cmd(u32 cmdr, u32 arg, u32 status, const char* msg) +{ + printf("gen_atmel_mci: CMDR %08x (%2u) ARGR %08x (SR: %08x) %s\n", + cmdr, cmdr&0x3F, arg, status, msg); +} + +/* Setup for MCI Clock and Block Size */ +static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen) +{ + atmel_mci_t *mci = (atmel_mci_t *)mmc->priv; + u32 bus_hz = get_mci_clk_rate(); + u32 clkdiv = 255; + + debug("mci: bus_hz is %u, setting clock %u Hz, block size %u\n", + bus_hz, hz, blklen); + if (hz > 0) { + /* find lowest clkdiv yielding a rate <= than requested */ + for (clkdiv=0; clkdiv<255; clkdiv++) { + if ((bus_hz / (clkdiv+1) / 2) <= hz) + break; + } + } + printf("mci: setting clock %u Hz, block size %u\n", + (bus_hz / (clkdiv+1)) / 2, blklen); + + blklen &= 0xfffc; + /* On some platforms RDPROOF and WRPROOF are ignored */ + writel((MMCI_BF(CLKDIV, clkdiv) + | MMCI_BF(BLKLEN, blklen) + | MMCI_BIT(RDPROOF) + | MMCI_BIT(WRPROOF)), &mci->mr); + initialized = 1; +} + +/* Return the CMDR with flags for a given command and data packet */ +static u32 mci_encode_cmd( + struct mmc_cmd *cmd, struct mmc_data *data, u32* error_flags) +{ + u32 cmdr = 0; + + /* Default Flags for Errors */ + *error_flags |= (MMCI_BIT(DTOE) | MMCI_BIT(RDIRE) | MMCI_BIT(RENDE) | + MMCI_BIT(RINDE) | MMCI_BIT(RTOE)); + + /* Default Flags for the Command */ + cmdr |= MMCI_BIT(MAXLAT); + + if (data) { + cmdr |= MMCI_BF(TRCMD, 1); + if (data->blocks > 1) + cmdr |= MMCI_BF(TRTYP, 1); + if (data->flags & MMC_DATA_READ) + cmdr |= MMCI_BIT(TRDIR); + } + + if (cmd->resp_type & MMC_RSP_CRC) + *error_flags |= MMCI_BIT(RCRCE); + if (cmd->resp_type & MMC_RSP_136) + cmdr |= MMCI_BF(RSPTYP, 2); + else if (cmd->resp_type & MMC_RSP_BUSY) + cmdr |= MMCI_BF(RSPTYP, 3); + else if (cmd->resp_type & MMC_RSP_PRESENT) + cmdr |= MMCI_BF(RSPTYP, 1); + + return cmdr | MMCI_BF(CMDNB, cmd->cmdidx); +} + +/* Entered into function pointer in mci_send_cmd */ +static u32 mci_data_read(atmel_mci_t *mci, u32* data, u32 error_flags) +{ + u32 status; + + do { + status = readl(&mci->sr); + if (status & (error_flags | MMCI_BIT(OVRE))) + goto io_fail; + } while (!(status & MMCI_BIT(RXRDY))); + + if (status & MMCI_BIT(RXRDY)) { + *data = readl(&mci->rdr); + status = 0; + } +io_fail: + return status; +} + +/* Entered into function pointer in mci_send_cmd */ +static u32 mci_data_write(atmel_mci_t *mci, u32* data, u32 error_flags) +{ + u32 status; + + do { + status = readl(&mci->sr); + if (status & (error_flags | MMCI_BIT(UNRE))) + goto io_fail; + } while (!(status & MMCI_BIT(TXRDY))); + + if (status & MMCI_BIT(TXRDY)) { + writel(*data, &mci->tdr); + status = 0; + } +io_fail: + return status; +} + +/* + * Entered into mmc structure during driver init + * + * Sends a command out on the bus and deals with the block data. + * Takes the mmc pointer, a command pointer, and an optional data pointer. + */ +static int +mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data) +{ + atmel_mci_t *mci = (atmel_mci_t *)mmc->priv; + u32 cmdr; + u32 error_flags = 0; + u32 status; + + if (!initialized) { + puts ("MCI not initialized!\n"); + return COMM_ERR; + } + + /* Figure out the transfer arguments */ + cmdr = mci_encode_cmd(cmd, data, &error_flags); + + /* Send the command */ + writel(cmd->cmdarg, &mci->argr); + writel(cmdr, &mci->cmdr); + +#ifdef DEBUG + dump_cmd(cmdr, cmd->cmdarg, 0, "DEBUG"); +#endif + + /* Wait for the command to complete */ + while (!((status = readl(&mci->sr)) & MMCI_BIT(CMDRDY))); + + if (status & error_flags) { + dump_cmd(cmdr, cmd->cmdarg, status, "Command Failed"); + return COMM_ERR; + } + + /* Copy the response to the response buffer */ + if (cmd->resp_type & MMC_RSP_136) { + cmd->response[0] = readl(&mci->rspr); + cmd->response[1] = readl(&mci->rspr1); + cmd->response[2] = readl(&mci->rspr2); + cmd->response[3] = readl(&mci->rspr3); + } else + cmd->response[0] = readl(&mci->rspr); + + /* transfer all of the blocks */ + if (data) { + u32 word_count, block_count; + u32* ioptr; + u32 sys_blocksize, dummy, i; + u32 (*mci_data_op) + (atmel_mci_t *mci, u32* data, u32 error_flags); + + if (data->flags & MMC_DATA_READ) { + mci_data_op = mci_data_read; + sys_blocksize = mmc->read_bl_len; + ioptr = (u32*)data->dest; + } else { + mci_data_op = mci_data_write; + sys_blocksize = mmc->write_bl_len; + ioptr = (u32*)data->src; + } + + status = 0; + for (block_count = 0; + block_count < data->blocks && !status; + block_count++) { + word_count = 0; + do { + status = mci_data_op(mci, ioptr, error_flags); + word_count++; + ioptr++; + } while (!status && word_count < (data->blocksize/4)); +#ifdef DEBUG + if (data->flags & MMC_DATA_READ) + { + printf("Read Data:\n"); + print_buffer(0, data->dest, 1, + word_count*4, 0); + } +#endif +#ifdef DEBUG + if (!status && word_count < (sys_blocksize / 4)) + printf("filling rest of block...\n"); +#endif + /* fill the rest of a full block */ + while (!status && word_count < (sys_blocksize / 4)) { + status = mci_data_op(mci, &dummy, + error_flags); + word_count++; + } + if (status) { + dump_cmd(cmdr, cmd->cmdarg, status, + "Data Transfer Failed"); + return COMM_ERR; + } + } + + /* Wait for Transfer End */ + i = 0; + do { + status = readl(&mci->sr); + + if (status & error_flags) { + dump_cmd(cmdr, cmd->cmdarg, status, + "DTIP Wait Failed"); + return COMM_ERR; + } + i++; + } while ((status & MMCI_BIT(DTIP)) && i < 10000); + if (status & MMCI_BIT(DTIP)) { + dump_cmd(cmdr, cmd->cmdarg, status, + "XFER DTIP never unset, ignoring"); + } + } + + return 0; +} + +/* Entered into mmc structure during driver init */ +static void mci_set_ios(struct mmc *mmc) +{ + atmel_mci_t *mci = (atmel_mci_t *)mmc->priv; + int busw = (mmc->bus_width == 4) ? 1 : 0; + + /* Set the clock speed */ + mci_set_mode(mmc, mmc->clock, MMC_DEFAULT_BLKLEN); + + /* + * set the bus width and select slot for this interface + * there is no capability for multiple slots on the same interface yet + * Bitfield SCDBUS needs to be expanded to 2 bits for 8-bit buses + */ + writel(MMCI_BF(SCDBUS, busw) | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr); +} + +/* Entered into mmc structure during driver init */ +static int mci_init(struct mmc *mmc) +{ + atmel_mci_t *mci = (atmel_mci_t *)mmc->priv; + + /* Initialize controller */ + writel(MMCI_BIT(SWRST), &mci->cr); /* soft reset */ + writel(MMCI_BIT(PWSDIS), &mci->cr); /* disable power save */ + writel(MMCI_BIT(MCIEN), &mci->cr); /* enable mci */ + + /* Initial Time-outs */ + writel(0x5f, &mci->dtor); + /* Disable Interrupts */ + writel(~0UL, &mci->idr); + + /* Set default clocks and blocklen */ + mci_set_mode(mmc, CONFIG_SYS_MMC_CLK_OD, MMC_DEFAULT_BLKLEN); + + return 0; +} + +/* + * This is the only exported function + * + * Call it with the MCI register base address + */ +int atmel_mci_init(void *regs) +{ + struct mmc *mmc = malloc(sizeof(struct mmc)); + + if (!mmc) + return -1; + strcpy(mmc->name, "mci"); + mmc->priv = regs; + mmc->send_cmd = mci_send_cmd; + mmc->set_ios = mci_set_ios; + mmc->init = mci_init; + + /* need to be able to pass these in on a board by board basis */ + mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34; + mmc->host_caps = MMC_MODE_4BIT; + /* + * min and max frequencies determined by + * max and min of clock divider + */ + mmc->f_min = get_mci_clk_rate() / (2*256); + mmc->f_max = get_mci_clk_rate() / (2*1); + + mmc_register(mmc); + + return 0; +} diff --git a/include/mmc.h b/include/mmc.h index fcb237e..9f94f42 100644 --- a/include/mmc.h +++ b/include/mmc.h @@ -179,6 +179,16 @@ struct mmc_cid { char pnm[7]; }; +/* + * WARNING! + * + * This structure is used by atmel_mci.c only. + * It works for the AVR32 architecture but NOT + * for ARM/AT91 architectures. + * Its use is highly depreciated. + * After the atmel_mci.c driver for AVR32 has + * been replaced this structure will be removed. + */ struct mmc_csd { u8 csd_structure:2, @@ -275,7 +285,10 @@ int mmc_set_dev(int dev_num); void print_mmc_devices(char separator); int board_mmc_getcd(u8 *cd, struct mmc *mmc); -#ifndef CONFIG_GENERIC_MMC +#ifdef CONFIG_GENERIC_MMC +int atmel_mci_init(void *regs); +#else int mmc_legacy_init(int verbose); #endif + #endif /* _MMC_H_ */ |