Re: [PATCH v2 4/4] Freescale enhanced Local Bus Controller FCM NAND support.

[Anton Vorontsov <avorontsov@ru.mvista.com>]

On Fri, Dec 14, 2007 at 12:56:24PM -0600, Scott Wood wrote:
> Signed-off-by: Nick Spence <nick.spence@freescale.com>
> Signed-off-by: Scott Wood <scottwood@freescale.com>
> ---
> Respun according to feedback; also, fixed a couple direct accesses
> of iomem.
> 
>  drivers/mtd/nand/Kconfig         |    9 +
>  drivers/mtd/nand/Makefile        |    1 +
>  drivers/mtd/nand/fsl_elbc_nand.c | 1217 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 1227 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/mtd/nand/fsl_elbc_nand.c
> 
[...]
> +#if 0
> +#define ELBC_NAND_DEBUG_LVL 6
> +#endif
> +
> +#ifdef ELBC_NAND_DEBUG_LVL
> +static int fcm_debug_level = ELBC_NAND_DEBUG_LVL;
> +#define FCM_DEBUG(n, args...)		\
> +	do {					\
> +		if (n <= fcm_debug_level)	\
> +			pr_dbg(args);	\
> +	} while(0)
> +#else
> +#define FCM_DEBUG(n, dev, args...) do { } while(0)
> +#endif

Only 1, 2 and 5 debug levels are used. Maybe better use dev_dbg
and dev_vdbg instead?

Btw, checkpatch result:
total: 69 errors, 14 warnings, 1236 lines checked

This isn't very friendly to the people going to look into.

> +#define MAX_BANKS 8
> +#define ERR_BYTE 0xFF /* Value returned for read bytes when read failed */
> +#define FCM_TIMEOUT_MSECS 500 /* Maximum number of mSecs to wait for FCM */
> +
> +struct elbc_bank {
> +	__be32 br;             /**< Base Register  */
> +#define BR_BA           0xFFFF8000
> +#define BR_BA_SHIFT             15
> +#define BR_PS           0x00001800
> +#define BR_PS_SHIFT             11
> +#define BR_PS_8         0x00000800  /* Port Size 8 bit */
> +#define BR_PS_16        0x00001000  /* Port Size 16 bit */
> +#define BR_PS_32        0x00001800  /* Port Size 32 bit */
> +#define BR_DECC         0x00000600
> +#define BR_DECC_SHIFT            9
> +#define BR_DECC_OFF     0x00000000  /* HW ECC checking and generation off */
> +#define BR_DECC_CHK     0x00000200  /* HW ECC checking on, generation off */
> +#define BR_DECC_CHK_GEN 0x00000400  /* HW ECC checking and generation on */
> +#define BR_WP           0x00000100
> +#define BR_WP_SHIFT              8
> +#define BR_MSEL         0x000000E0
> +#define BR_MSEL_SHIFT            5
> +#define BR_MS_GPCM      0x00000000  /* GPCM */
> +#define BR_MS_FCM       0x00000020  /* FCM */
> +#define BR_MS_SDRAM     0x00000060  /* SDRAM */
> +#define BR_MS_UPMA      0x00000080  /* UPMA */
> +#define BR_MS_UPMB      0x000000A0  /* UPMB */
> +#define BR_MS_UPMC      0x000000C0  /* UPMC */
> +#define BR_V            0x00000001
> +#define BR_V_SHIFT               0
> +#define BR_RES          ~(BR_BA|BR_PS|BR_DECC|BR_WP|BR_MSEL|BR_V)
> +
> +	__be32 or;             /**< Base Register  */
> +#define OR0 0x5004
> +#define OR1 0x500C
> +#define OR2 0x5014
> +#define OR3 0x501C
> +#define OR4 0x5024
> +#define OR5 0x502C
> +#define OR6 0x5034
> +#define OR7 0x503C
> +
> +#define OR_FCM_AM               0xFFFF8000
> +#define OR_FCM_AM_SHIFT                 15
> +#define OR_FCM_BCTLD            0x00001000
> +#define OR_FCM_BCTLD_SHIFT              12
> +#define OR_FCM_PGS              0x00000400
> +#define OR_FCM_PGS_SHIFT                10
> +#define OR_FCM_CSCT             0x00000200
> +#define OR_FCM_CSCT_SHIFT                9
> +#define OR_FCM_CST              0x00000100
> +#define OR_FCM_CST_SHIFT                 8
> +#define OR_FCM_CHT              0x00000080
> +#define OR_FCM_CHT_SHIFT                 7
> +#define OR_FCM_SCY              0x00000070
> +#define OR_FCM_SCY_SHIFT                 4
> +#define OR_FCM_SCY_1            0x00000010
> +#define OR_FCM_SCY_2            0x00000020
> +#define OR_FCM_SCY_3            0x00000030
> +#define OR_FCM_SCY_4            0x00000040
> +#define OR_FCM_SCY_5            0x00000050
> +#define OR_FCM_SCY_6            0x00000060
> +#define OR_FCM_SCY_7            0x00000070
> +#define OR_FCM_RST              0x00000008
> +#define OR_FCM_RST_SHIFT                 3
> +#define OR_FCM_TRLX             0x00000004
> +#define OR_FCM_TRLX_SHIFT                2
> +#define OR_FCM_EHTR             0x00000002
> +#define OR_FCM_EHTR_SHIFT                1
> +};
> +
> +struct elbc_regs {
> +	struct elbc_bank bank[8];
> +	u8 res0[0x28];
> +	__be32 mar;             /**< UPM Address Register */
> +	u8 res1[0x4];
> +	__be32 mamr;            /**< UPMA Mode Register */
> +	__be32 mbmr;            /**< UPMB Mode Register */
> +	__be32 mcmr;            /**< UPMC Mode Register */
> +	u8 res2[0x8];
> +	__be32 mrtpr;           /**< Memory Refresh Timer Prescaler Register */
> +	__be32 mdr;             /**< UPM Data Register */
> +	u8 res3[0x4];
> +	__be32 lsor;            /**< Special Operation Initiation Register */
> +	__be32 lsdmr;           /**< SDRAM Mode Register */
> +	u8 res4[0x8];
> +	__be32 lurt;            /**< UPM Refresh Timer */
> +	__be32 lsrt;            /**< SDRAM Refresh Timer */
> +	u8 res5[0x8];
> +	__be32 ltesr;           /**< Transfer Error Status Register */
> +#define LTESR_BM   0x80000000
> +#define LTESR_FCT  0x40000000
> +#define LTESR_PAR  0x20000000
> +#define LTESR_WP   0x04000000
> +#define LTESR_ATMW 0x00800000
> +#define LTESR_ATMR 0x00400000
> +#define LTESR_CS   0x00080000
> +#define LTESR_CC   0x00000001
> +#define LTESR_NAND_MASK (LTESR_FCT | LTESR_PAR | LTESR_CC)
> +	__be32 ltedr;           /**< Transfer Error Disable Register */
> +	__be32 lteir;           /**< Transfer Error Interrupt Register */
> +	__be32 lteatr;          /**< Transfer Error Attributes Register */
> +	__be32 ltear;           /**< Transfer Error Address Register */
> +	u8 res6[0xC];
> +	__be32 lbcr;            /**< Configuration Register */
> +#define LBCR_LDIS  0x80000000
> +#define LBCR_LDIS_SHIFT    31
> +#define LBCR_BCTLC 0x00C00000
> +#define LBCR_BCTLC_SHIFT   22
> +#define LBCR_AHD   0x00200000
> +#define LBCR_LPBSE 0x00020000
> +#define LBCR_LPBSE_SHIFT   17
> +#define LBCR_EPAR  0x00010000
> +#define LBCR_EPAR_SHIFT    16
> +#define LBCR_BMT   0x0000FF00
> +#define LBCR_BMT_SHIFT      8
> +#define LBCR_INIT  0x00040000
> +	__be32 lcrr;            /**< Clock Ratio Register */
> +#define LCRR_DBYP    0x80000000
> +#define LCRR_DBYP_SHIFT      31
> +#define LCRR_BUFCMDC 0x30000000
> +#define LCRR_BUFCMDC_SHIFT   28
> +#define LCRR_ECL     0x03000000
> +#define LCRR_ECL_SHIFT       24
> +#define LCRR_EADC    0x00030000
> +#define LCRR_EADC_SHIFT      16
> +#define LCRR_CLKDIV  0x0000000F
> +#define LCRR_CLKDIV_SHIFT     0
> +	u8 res7[0x8];
> +	__be32 fmr;             /**< Flash Mode Register */
> +#define FMR_CWTO     0x0000F000
> +#define FMR_CWTO_SHIFT       12
> +#define FMR_BOOT     0x00000800
> +#define FMR_ECCM     0x00000100
> +#define FMR_AL       0x00000030
> +#define FMR_AL_SHIFT          4
> +#define FMR_OP       0x00000003
> +#define FMR_OP_SHIFT          0
> +	__be32 fir;             /**< Flash Instruction Register */
> +#define FIR_OP0      0xF0000000
> +#define FIR_OP0_SHIFT        28
> +#define FIR_OP1      0x0F000000
> +#define FIR_OP1_SHIFT        24
> +#define FIR_OP2      0x00F00000
> +#define FIR_OP2_SHIFT        20
> +#define FIR_OP3      0x000F0000
> +#define FIR_OP3_SHIFT        16
> +#define FIR_OP4      0x0000F000
> +#define FIR_OP4_SHIFT        12
> +#define FIR_OP5      0x00000F00
> +#define FIR_OP5_SHIFT         8
> +#define FIR_OP6      0x000000F0
> +#define FIR_OP6_SHIFT         4
> +#define FIR_OP7      0x0000000F
> +#define FIR_OP7_SHIFT         0
> +#define FIR_OP_NOP   0x0	/* No operation and end of sequence */
> +#define FIR_OP_CA    0x1        /* Issue current column address */
> +#define FIR_OP_PA    0x2        /* Issue current block+page address */
> +#define FIR_OP_UA    0x3        /* Issue user defined address */
> +#define FIR_OP_CM0   0x4        /* Issue command from FCR[CMD0] */
> +#define FIR_OP_CM1   0x5        /* Issue command from FCR[CMD1] */
> +#define FIR_OP_CM2   0x6        /* Issue command from FCR[CMD2] */
> +#define FIR_OP_CM3   0x7        /* Issue command from FCR[CMD3] */
> +#define FIR_OP_WB    0x8        /* Write FBCR bytes from FCM buffer */
> +#define FIR_OP_WS    0x9        /* Write 1 or 2 bytes from MDR[AS] */
> +#define FIR_OP_RB    0xA        /* Read FBCR bytes to FCM buffer */
> +#define FIR_OP_RS    0xB        /* Read 1 or 2 bytes to MDR[AS] */
> +#define FIR_OP_CW0   0xC        /* Wait then issue FCR[CMD0] */
> +#define FIR_OP_CW1   0xD        /* Wait then issue FCR[CMD1] */
> +#define FIR_OP_RBW   0xE        /* Wait then read FBCR bytes */
> +#define FIR_OP_RSW   0xE        /* Wait then read 1 or 2 bytes */
> +	__be32 fcr;             /**< Flash Command Register */
> +#define FCR_CMD0     0xFF000000
> +#define FCR_CMD0_SHIFT       24
> +#define FCR_CMD1     0x00FF0000
> +#define FCR_CMD1_SHIFT       16
> +#define FCR_CMD2     0x0000FF00
> +#define FCR_CMD2_SHIFT        8
> +#define FCR_CMD3     0x000000FF
> +#define FCR_CMD3_SHIFT        0
> +	__be32 fbar;            /**< Flash Block Address Register */
> +#define FBAR_BLK     0x00FFFFFF
> +	__be32 fpar;            /**< Flash Page Address Register */
> +#define FPAR_SP_PI   0x00007C00
> +#define FPAR_SP_PI_SHIFT     10
> +#define FPAR_SP_MS   0x00000200
> +#define FPAR_SP_CI   0x000001FF
> +#define FPAR_SP_CI_SHIFT      0
> +#define FPAR_LP_PI   0x0003F000
> +#define FPAR_LP_PI_SHIFT     12
> +#define FPAR_LP_MS   0x00000800
> +#define FPAR_LP_CI   0x000007FF
> +#define FPAR_LP_CI_SHIFT      0
> +	__be32 fbcr;            /**< Flash Byte Count Register */
> +#define FBCR_BC      0x00000FFF
> +	u8 res11[0x8];
> +	u8 res8[0xF00];
> +};
> +

Maybe this desires its own header?


Thanks!

-- 
Anton Vorontsov
email: cbou@mail.ru
backup email: ya-cbou@yandex.ru
irc://irc.freenode.net/bd2