SD card driver

Hardware resources ms_wp, sd_wp, and SD card write protection: gpi_09. The write protection switch for the driver to read the SD card is used for different operations. ms_cd, sd_cd, and plug-in card Detection: gpi_04. (Ms_cd and ms_wp on the left of the schematic diagram are reversed, and the network number shall prevail.) ms_pwr, sd_pwr, power control pin, gpo_01, and 2sj355 are controlled. The driver write protection detects that gpi_09 is a single function that only inputs pins and reads the pin status, registers: p3_inp_state [9]. Code: 103 u32 TMP; 104105 TMP = _ raw_readl (gpio_p3_inp_state (gpio_iobase) & inp_state_gpi_09; by default, Codes Without MMC write protection need to be added. For mmc_platform_data data structure definitions, see :. /ARCH/ARM/include/ASM/Mach/MMC. before writing protection, the plug-in card displays the following prompt: mmc0: host does not support reading read-only switch. assuming write-enable. information from drivers/MMC/CORE/SD. print the c file. The SD card write protection status is read by the host-> OPS-> get_ro function. The following file seems to implement the get_ro function: [chenxibing @ localhost linux-2.6.27.8] $ grep mmc_host_ops-r Drivers/MMC/host/imxmmc. c: static const struct mmc_host_ops imxmci_ops = {Drivers/MMC/host/wbsd. c: static const struct mmc_host_ops wbsd_ops = {Drivers/MMC/host/tifm_sd.c: static const struct mmc_host_ops tifm_sd_ops = {Drivers/MMC/host/sdricoh_cs.c: static struct mmc_host_ops sdricoh_ops = {Drivers/MMC/host/OMA P. c: static const struct mmc_host_ops mmc_omap_ops = {Drivers/MMC/host/pxamci. c: static const struct mmc_host_ops pxamci_ops = {Drivers/MMC/host/at91_mci.c: static const struct mmc_host_ops at91_mci_ops = {Drivers/MMC/host/cloudmci. c: static struct mmc_host_ops s3mci_ops = {Drivers/MMC/host/mmci. c: static const struct mmc_host_ops mmci_ops = {Drivers/MMC/host/atmel-mci.c: static struct mmc_host_ops atmci _ Ops = {Drivers/MMC/host/sdhci. c: static const struct mmc_host_ops sdhci_ops = {Drivers/MMC/host/tmio_mmc.c: static struct mmc_host_ops tmio_mmc_ops = {Drivers/MMC/host/au1xmmc. c: static const struct mmc_host_ops au1xmmc_ops = {Drivers/MMC/host/mmc_spi.c: * beginning of an mmc_host_ops.request until the end. so bewaredrivers/MMC/host/mmc_spi.c: static const struct mmc_host_ops mmc_spi_ops = {mm of omap1 C: 84 static struct omap_mmc_platform_data h3_mmc_data = {85. nr_slots = 1,86. switch_slot = NULL, 87. init = h3_mmc_late_init, 88. cleanup = h3_mmc_cleanup, 89. slots [0] = {90. set_power = h3_mmc_set_power, 91. set_bus_mode = h3_mmc_set_bus_mode, 92. get_ro = NULL, 93. get_cover_state = h3_mmc_get_cover_state, 94. ocr_mask = mmc_vdd_28_29 | mmc_vdd_30_31 | 95 mmc_vdd_32_33 | mmc_vdd_33_34, 96. name = "MMC BLK ", 97}, 98}; omap_mmc_platform_data is defined in the arch/ARM/Plat-OMAP/include/Mach/mmc. h file. 22 struct omap_mmc_platform_data {23 struct omap_mmc_conf conf; 2425/* number of slots on board */26 unsigned nr_slots: 2; 2728/* set if your board has components or wiring that limits the29 * maximum frequency on the MMC bus */30 unsigned int max_freq; 3132/* switch the bus to a new slot */33 int (* switch_slot) (struct device * Dev, int slot); 34/* initialize board-specific MMC functionality, can be Null if35 * not supported */36 int (* init) (struct device * Dev); 37 void (* cleanup) (struct device * Dev); 38 void (* shutdown) (struct device * Dev); 3940/* to handle Board related suspend/resume functionality for MMC */41 int (* suspend) (struct device * Dev, int slot ); 42 int (* resume) (struct device * Dev, int slot); 4344 struct omap_mmc_slot_data {45 int (* set_bus_mode) (struct device * Dev, int slot, in T bus_mode); 46 int (* set_power) (struct device * Dev, int slot, int power_on, int VDD); 47 int (* get_ro) (struct device * Dev, int slot); 4849/* return MMC cover switch state, can be null if not supported.50 * 51 * possible return values: 52*0-open53*1-closed54 */55 int (* get_cover_state) (struct device * Dev, int slot); 5657 const char * Name; 58 u32 ocr_mask; 5960/* card detection irqs */61 int C Ard_detect_irq; 62 int (* card_detect) (int irq); 6364 unsigned int ban_openended: 1; 6566} slots [blocks]; 67}; the SD/MMC of lpc3250 adopts the abma_device structure description: 475 struct amba_device mmc_device = {476. dev ={ 477. coherent_dma_mask = ~ 0,478. bus_id = "Dev: 31", 479. platform_data = & lpc32xx_plat_data, 480}, 481. res = {482. start = SDK, 483. end = (sd_base + sz_4k-1), 484. flags = ioresource_mem, 485}, 486. dma_mask = ~ 0,487. IRQ = {irq_sd0, irq_sd1}, 488}; The amba_device structure is in. /include/Linux/AMBA/bus. the H file is defined as follows: 16 stuct amba_device {17 struct device dev; 18 struct resource res; 19 u64 dma_mask; 20 unsigned int periphid; 21 int IRQ [amba_nr_irqs]; 22 }; the host of the lpc3250 instance does not support get_ro and cannot detect whether the SD card is write-protected. Write protection implementation because the host of the lpc3250 does not support get_ro, we have to adopt a more direct method to directly modify Drivers/MMC/CORE/SD. in the c file, modify the function to check whether the SD card is write-protected: 499/* 500 * Check if read-only switch is active.501 */502 if (! Oldcard) {503 # If defined (bytes) 504 u32 TMP; 505 506 TMP = _ raw_readl (gpio_p3_inp_state (gpio_iobase) & inp_state_gpi_09; 507 if (TMP = 0) {508 printk (kern_warning "% s: In read-write mode \ n", mmc_hostname (host); 509} else {510 mmc_card_set_readonly (card ); 511} 512 # else513 if (! Host-> OPS-> get_ro | host-> OPS-> get_ro (host) <0) {514 printk (kern_warning "% s: host does not "515" support reading read-only "516" switch. assuming write-enable. \ n ", 517 mmc_hostname (host); 518} else {519 if (host-> OPS-> get_ro (host)> 0) 520 mmc_card_set_readonly (card ); 521} 522 # endif523} Of course, you need to add some necessary header files: 25 # If defined (config_mach_smartarm3250) 26 # include <Mach/lpc32xx_gpio.h> 27 # include "http :/ /Www.cnblogs.com/./arch/arm/mach-lpc32xx/sys-lpc32xx.h "28 # include <Mach/hardware. h> 29 # endif plug-in card detection gpi_04 is a single function that only inputs pins, registers p3_inp_state [4 Code :__ raw_readl (gpio_p3_inp_state (gpio_iobase) & inp_state_gpi_04; Power Control gpo_01 is a single function that only outputs pins, registers p3_outp_set [1] and p3_outp_clr [1]. Code: 144 _ raw_writel (outp_state_gpo (1), callback (gpio_iobase); 148 _ raw_writel (outp_state_gpo (1), callback (gpio_iobase); insert the operation information after write protection, create a directory after mounting: [root @ NXP root] # mmc0: New SD card at address e624mmcblk0: mmc0: e624 sd01g 992000kib (RO) mmcblk0: [root @ NXP root] # Mount-T vfat/dev/mmcblk0/mnt/[root @ NXP root] # mkdir/mnt/abing8mkdir: cannot create directory '/mnt/abing8': Read-Only file system [root @ NXP root] # umount/mnt/[root @ NXP root] # unplug the card and Remove write protection, insert again, mount and create the Directory: mmc0: Card e624 removedmmc0: In read-write modemmc0: New SD card at address e624mmcblk0: mmc0: e624 sd01g 992000kibmmcblk0: [root @ NXP root] # Mount-T vfat/dev/mmcblk0/mnt/[root @ NXP root] # mkdir/mnt/abing8 [root @ NXP root] # umount/mnt /view again: [root @ NXP root] # Mount-T vfat/dev/mmcblk0/mnt/[root @ NXP root] # ls/mnt/3250serial.exe abing8 2.bin