cfi.h
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上传日期:2013-04-10
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- /* Common Flash Interface structures
- * See http://support.intel.com/design/flash/technote/index.htm
- * $Id: cfi.h,v 1.25 2001/09/04 07:06:21 dwmw2 Exp $
- */
- #ifndef __MTD_CFI_H__
- #define __MTD_CFI_H__
- #include <linux/config.h>
- #include <linux/delay.h>
- #include <linux/types.h>
- #include <linux/interrupt.h>
- #include <linux/mtd/flashchip.h>
- #include <linux/mtd/cfi_endian.h>
- /*
- * You can optimize the code size and performance by defining only
- * the geometry(ies) available on your hardware.
- * CFIDEV_INTERLEAVE_n, where represents the interleave (number of chips to fill the bus width)
- * CFIDEV_BUSWIDTH_n, where n is the bus width in bytes (1, 2 or 4 bytes)
- *
- * By default, all (known) geometries are supported.
- */
- #ifndef CONFIG_MTD_CFI_GEOMETRY
- #define CFIDEV_INTERLEAVE_1 (1)
- #define CFIDEV_INTERLEAVE_2 (2)
- #define CFIDEV_INTERLEAVE_4 (4)
- #define CFIDEV_BUSWIDTH_1 (1)
- #define CFIDEV_BUSWIDTH_2 (2)
- #define CFIDEV_BUSWIDTH_4 (4)
- #else
- #ifdef CONFIG_MTD_CFI_I1
- #define CFIDEV_INTERLEAVE_1 (1)
- #endif
- #ifdef CONFIG_MTD_CFI_I2
- #define CFIDEV_INTERLEAVE_2 (2)
- #endif
- #ifdef CONFIG_MTD_CFI_I4
- #define CFIDEV_INTERLEAVE_4 (4)
- #endif
- #ifdef CONFIG_MTD_CFI_B1
- #define CFIDEV_BUSWIDTH_1 (1)
- #endif
- #ifdef CONFIG_MTD_CFI_B2
- #define CFIDEV_BUSWIDTH_2 (2)
- #endif
- #ifdef CONFIG_MTD_CFI_B4
- #define CFIDEV_BUSWIDTH_4 (4)
- #endif
- #endif
- /*
- * The following macros are used to select the code to execute:
- * cfi_buswidth_is_*()
- * cfi_interleave_is_*()
- * [where * is either 1, 2 or 4]
- * Those macros should be used with 'if' statements. If only one of few
- * geometry arrangements are selected, they expand to constants thus allowing
- * the compiler (most of them being 0) to optimize away all the unneeded code,
- * while still validating the syntax (which is not possible with embedded
- * #if ... #endif constructs).
- */
- #ifdef CFIDEV_INTERLEAVE_1
- # ifdef CFIDEV_INTERLEAVE
- # undef CFIDEV_INTERLEAVE
- # define CFIDEV_INTERLEAVE (cfi->interleave)
- # else
- # define CFIDEV_INTERLEAVE CFIDEV_INTERLEAVE_1
- # endif
- # define cfi_interleave_is_1() (CFIDEV_INTERLEAVE == CFIDEV_INTERLEAVE_1)
- #else
- # define cfi_interleave_is_1() (0)
- #endif
- #ifdef CFIDEV_INTERLEAVE_2
- # ifdef CFIDEV_INTERLEAVE
- # undef CFIDEV_INTERLEAVE
- # define CFIDEV_INTERLEAVE (cfi->interleave)
- # else
- # define CFIDEV_INTERLEAVE CFIDEV_INTERLEAVE_2
- # endif
- # define cfi_interleave_is_2() (CFIDEV_INTERLEAVE == CFIDEV_INTERLEAVE_2)
- #else
- # define cfi_interleave_is_2() (0)
- #endif
- #ifdef CFIDEV_INTERLEAVE_4
- # ifdef CFIDEV_INTERLEAVE
- # undef CFIDEV_INTERLEAVE
- # define CFIDEV_INTERLEAVE (cfi->interleave)
- # else
- # define CFIDEV_INTERLEAVE CFIDEV_INTERLEAVE_4
- # endif
- # define cfi_interleave_is_4() (CFIDEV_INTERLEAVE == CFIDEV_INTERLEAVE_4)
- #else
- # define cfi_interleave_is_4() (0)
- #endif
- #ifndef CFIDEV_INTERLEAVE
- #error You must define at least one interleave to support!
- #endif
- #ifdef CFIDEV_BUSWIDTH_1
- # ifdef CFIDEV_BUSWIDTH
- # undef CFIDEV_BUSWIDTH
- # define CFIDEV_BUSWIDTH (map->buswidth)
- # else
- # define CFIDEV_BUSWIDTH CFIDEV_BUSWIDTH_1
- # endif
- # define cfi_buswidth_is_1() (CFIDEV_BUSWIDTH == CFIDEV_BUSWIDTH_1)
- #else
- # define cfi_buswidth_is_1() (0)
- #endif
- #ifdef CFIDEV_BUSWIDTH_2
- # ifdef CFIDEV_BUSWIDTH
- # undef CFIDEV_BUSWIDTH
- # define CFIDEV_BUSWIDTH (map->buswidth)
- # else
- # define CFIDEV_BUSWIDTH CFIDEV_BUSWIDTH_2
- # endif
- # define cfi_buswidth_is_2() (CFIDEV_BUSWIDTH == CFIDEV_BUSWIDTH_2)
- #else
- # define cfi_buswidth_is_2() (0)
- #endif
- #ifdef CFIDEV_BUSWIDTH_4
- # ifdef CFIDEV_BUSWIDTH
- # undef CFIDEV_BUSWIDTH
- # define CFIDEV_BUSWIDTH (map->buswidth)
- # else
- # define CFIDEV_BUSWIDTH CFIDEV_BUSWIDTH_4
- # endif
- # define cfi_buswidth_is_4() (CFIDEV_BUSWIDTH == CFIDEV_BUSWIDTH_4)
- #else
- # define cfi_buswidth_is_4() (0)
- #endif
- #ifndef CFIDEV_BUSWIDTH
- #error You must define at least one bus width to support!
- #endif
- /* NB: these values must represents the number of bytes needed to meet the
- * device type (x8, x16, x32). Eg. a 32 bit device is 4 x 8 bytes.
- * These numbers are used in calculations.
- */
- #define CFI_DEVICETYPE_X8 (8 / 8)
- #define CFI_DEVICETYPE_X16 (16 / 8)
- #define CFI_DEVICETYPE_X32 (32 / 8)
- /* NB: We keep these structures in memory in HOST byteorder, except
- * where individually noted.
- */
- /* Basic Query Structure */
- struct cfi_ident {
- __u8 qry[3];
- __u16 P_ID;
- __u16 P_ADR;
- __u16 A_ID;
- __u16 A_ADR;
- __u8 VccMin;
- __u8 VccMax;
- __u8 VppMin;
- __u8 VppMax;
- __u8 WordWriteTimeoutTyp;
- __u8 BufWriteTimeoutTyp;
- __u8 BlockEraseTimeoutTyp;
- __u8 ChipEraseTimeoutTyp;
- __u8 WordWriteTimeoutMax;
- __u8 BufWriteTimeoutMax;
- __u8 BlockEraseTimeoutMax;
- __u8 ChipEraseTimeoutMax;
- __u8 DevSize;
- __u16 InterfaceDesc;
- __u16 MaxBufWriteSize;
- __u8 NumEraseRegions;
- __u32 EraseRegionInfo[0]; /* Not host ordered */
- } __attribute__((packed));
- /* Extended Query Structure for both PRI and ALT */
- struct cfi_extquery {
- __u8 pri[3];
- __u8 MajorVersion;
- __u8 MinorVersion;
- } __attribute__((packed));
- /* Vendor-Specific PRI for Intel/Sharp Extended Command Set (0x0001) */
- struct cfi_pri_intelext {
- __u8 pri[3];
- __u8 MajorVersion;
- __u8 MinorVersion;
- __u32 FeatureSupport;
- __u8 SuspendCmdSupport;
- __u16 BlkStatusRegMask;
- __u8 VccOptimal;
- __u8 VppOptimal;
- } __attribute__((packed));
- struct cfi_pri_query {
- __u8 NumFields;
- __u32 ProtField[1]; /* Not host ordered */
- } __attribute__((packed));
- struct cfi_bri_query {
- __u8 PageModeReadCap;
- __u8 NumFields;
- __u32 ConfField[1]; /* Not host ordered */
- } __attribute__((packed));
- #define P_ID_NONE 0
- #define P_ID_INTEL_EXT 1
- #define P_ID_AMD_STD 2
- #define P_ID_INTEL_STD 3
- #define P_ID_AMD_EXT 4
- #define P_ID_MITSUBISHI_STD 256
- #define P_ID_MITSUBISHI_EXT 257
- #define P_ID_RESERVED 65535
- #define CFI_MODE_CFI 0
- #define CFI_MODE_JEDEC 1
- struct cfi_private {
- __u16 cmdset;
- void *cmdset_priv;
- int interleave;
- int device_type;
- int cfi_mode; /* Are we a JEDEC device pretending to be CFI? */
- int addr_unlock1;
- int addr_unlock2;
- int fast_prog;
- struct mtd_info *(*cmdset_setup)(struct map_info *);
- struct cfi_ident *cfiq; /* For now only one. We insist that all devs
- must be of the same type. */
- int mfr, id;
- int numchips;
- unsigned long chipshift; /* Because they're of the same type */
- const char *im_name; /* inter_module name for cmdset_setup */
- struct flchip chips[0]; /* per-chip data structure for each chip */
- };
- #define MAX_CFI_CHIPS 8 /* Entirely arbitrary to avoid realloc() */
- /*
- * Returns the command address according to the given geometry.
- */
- static inline __u32 cfi_build_cmd_addr(__u32 cmd_ofs, int interleave, int type)
- {
- return (cmd_ofs * type) * interleave;
- }
- /*
- * Transforms the CFI command for the given geometry (bus width & interleave.
- */
- static inline __u32 cfi_build_cmd(u_char cmd, struct map_info *map, struct cfi_private *cfi)
- {
- __u32 val = 0;
- if (cfi_buswidth_is_1()) {
- /* 1 x8 device */
- val = cmd;
- } else if (cfi_buswidth_is_2()) {
- if (cfi_interleave_is_1()) {
- /* 1 x16 device in x16 mode */
- val = cpu_to_cfi16(cmd);
- } else if (cfi_interleave_is_2()) {
- /* 2 (x8, x16 or x32) devices in x8 mode */
- val = cpu_to_cfi16((cmd << 8) | cmd);
- }
- } else if (cfi_buswidth_is_4()) {
- if (cfi_interleave_is_1()) {
- /* 1 x32 device in x32 mode */
- val = cpu_to_cfi32(cmd);
- } else if (cfi_interleave_is_2()) {
- /* 2 x16 device in x16 mode */
- val = cpu_to_cfi32((cmd << 16) | cmd);
- } else if (cfi_interleave_is_4()) {
- /* 4 (x8, x16 or x32) devices in x8 mode */
- val = (cmd << 16) | cmd;
- val = cpu_to_cfi32((val << 8) | val);
- }
- }
- return val;
- }
- #define CMD(x) cfi_build_cmd((x), map, cfi)
- /*
- * Read a value according to the bus width.
- */
- static inline __u32 cfi_read(struct map_info *map, __u32 addr)
- {
- if (cfi_buswidth_is_1()) {
- return map->read8(map, addr);
- } else if (cfi_buswidth_is_2()) {
- return map->read16(map, addr);
- } else if (cfi_buswidth_is_4()) {
- return map->read32(map, addr);
- } else {
- return 0;
- }
- }
- /*
- * Write a value according to the bus width.
- */
- static inline void cfi_write(struct map_info *map, __u32 val, __u32 addr)
- {
- if (cfi_buswidth_is_1()) {
- map->write8(map, val, addr);
- } else if (cfi_buswidth_is_2()) {
- map->write16(map, val, addr);
- } else if (cfi_buswidth_is_4()) {
- map->write32(map, val, addr);
- }
- }
- /*
- * Sends a CFI command to a bank of flash for the given geometry.
- *
- * Returns the offset in flash where the command was written.
- * If prev_val is non-null, it will be set to the value at the command address,
- * before the command was written.
- */
- static inline __u32 cfi_send_gen_cmd(u_char cmd, __u32 cmd_addr, __u32 base,
- struct map_info *map, struct cfi_private *cfi,
- int type, __u32 *prev_val)
- {
- __u32 val;
- __u32 addr = base + cfi_build_cmd_addr(cmd_addr, CFIDEV_INTERLEAVE, type);
- val = cfi_build_cmd(cmd, map, cfi);
- if (prev_val)
- *prev_val = cfi_read(map, addr);
- cfi_write(map, val, addr);
- return addr - base;
- }
- static inline __u8 cfi_read_query(struct map_info *map, __u32 addr)
- {
- if (cfi_buswidth_is_1()) {
- return map->read8(map, addr);
- } else if (cfi_buswidth_is_2()) {
- return cfi16_to_cpu(map->read16(map, addr));
- } else if (cfi_buswidth_is_4()) {
- return cfi32_to_cpu(map->read32(map, addr));
- } else {
- return 0;
- }
- }
- static inline void cfi_udelay(int us)
- {
- #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
- if (current->need_resched) {
- unsigned long t = us * HZ / 1000000;
- if (t < 1)
- t = 1;
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(t);
- }
- else
- #endif
- udelay(us);
- }
- static inline void cfi_spin_lock(spinlock_t *mutex)
- {
- spin_lock_bh(mutex);
- }
- static inline void cfi_spin_unlock(spinlock_t *mutex)
- {
- spin_unlock_bh(mutex);
- }
- #endif /* __MTD_CFI_H__ */