6667a6d58e
There are multiple reasons for a rewrite: - a race exists: when _4ECCEND is set, _4ECCFA may become true too meanwhile, which is lost and a non-correctable error is treated as correctable. - the ECC statistics don't get properly propagated to the base code. - empty pages would get marked as corrupted The rewrite resolves the issues and I hope it gives a more explicit code flow structure. Signed-off-by: Bastian Hecht <hechtb@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
181 lines
6.1 KiB
C
181 lines
6.1 KiB
C
/*
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* SuperH FLCTL nand controller
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*
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* Copyright © 2008 Renesas Solutions Corp.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __SH_FLCTL_H__
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#define __SH_FLCTL_H__
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/partitions.h>
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#include <linux/pm_qos.h>
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/* FLCTL registers */
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#define FLCMNCR(f) (f->reg + 0x0)
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#define FLCMDCR(f) (f->reg + 0x4)
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#define FLCMCDR(f) (f->reg + 0x8)
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#define FLADR(f) (f->reg + 0xC)
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#define FLADR2(f) (f->reg + 0x3C)
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#define FLDATAR(f) (f->reg + 0x10)
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#define FLDTCNTR(f) (f->reg + 0x14)
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#define FLINTDMACR(f) (f->reg + 0x18)
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#define FLBSYTMR(f) (f->reg + 0x1C)
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#define FLBSYCNT(f) (f->reg + 0x20)
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#define FLDTFIFO(f) (f->reg + 0x24)
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#define FLECFIFO(f) (f->reg + 0x28)
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#define FLTRCR(f) (f->reg + 0x2C)
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#define FLHOLDCR(f) (f->reg + 0x38)
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#define FL4ECCRESULT0(f) (f->reg + 0x80)
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#define FL4ECCRESULT1(f) (f->reg + 0x84)
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#define FL4ECCRESULT2(f) (f->reg + 0x88)
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#define FL4ECCRESULT3(f) (f->reg + 0x8C)
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#define FL4ECCCR(f) (f->reg + 0x90)
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#define FL4ECCCNT(f) (f->reg + 0x94)
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#define FLERRADR(f) (f->reg + 0x98)
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/* FLCMNCR control bits */
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#define _4ECCCNTEN (0x1 << 24)
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#define _4ECCEN (0x1 << 23)
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#define _4ECCCORRECT (0x1 << 22)
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#define SHBUSSEL (0x1 << 20)
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#define SEL_16BIT (0x1 << 19)
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#define SNAND_E (0x1 << 18) /* SNAND (0=512 1=2048)*/
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#define QTSEL_E (0x1 << 17)
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#define ENDIAN (0x1 << 16) /* 1 = little endian */
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#define FCKSEL_E (0x1 << 15)
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#define ACM_SACCES_MODE (0x01 << 10)
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#define NANWF_E (0x1 << 9)
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#define SE_D (0x1 << 8) /* Spare area disable */
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#define CE1_ENABLE (0x1 << 4) /* Chip Enable 1 */
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#define CE0_ENABLE (0x1 << 3) /* Chip Enable 0 */
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#define TYPESEL_SET (0x1 << 0)
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/*
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* Clock settings using the PULSEx registers from FLCMNCR
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*
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* Some hardware uses bits called PULSEx instead of FCKSEL_E and QTSEL_E
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* to control the clock divider used between the High-Speed Peripheral Clock
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* and the FLCTL internal clock. If so, use CLK_8_BIT_xxx for connecting 8 bit
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* and CLK_16_BIT_xxx for connecting 16 bit bus bandwith NAND chips. For the 16
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* bit version the divider is seperate for the pulse width of high and low
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* signals.
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*/
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#define PULSE3 (0x1 << 27)
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#define PULSE2 (0x1 << 17)
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#define PULSE1 (0x1 << 15)
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#define PULSE0 (0x1 << 9)
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#define CLK_8B_0_5 PULSE1
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#define CLK_8B_1 0x0
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#define CLK_8B_1_5 (PULSE1 | PULSE2)
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#define CLK_8B_2 PULSE0
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#define CLK_8B_3 (PULSE0 | PULSE1 | PULSE2)
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#define CLK_8B_4 (PULSE0 | PULSE2)
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#define CLK_16B_6L_2H PULSE0
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#define CLK_16B_9L_3H (PULSE0 | PULSE1 | PULSE2)
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#define CLK_16B_12L_4H (PULSE0 | PULSE2)
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/* FLCMDCR control bits */
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#define ADRCNT2_E (0x1 << 31) /* 5byte address enable */
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#define ADRMD_E (0x1 << 26) /* Sector address access */
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#define CDSRC_E (0x1 << 25) /* Data buffer selection */
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#define DOSR_E (0x1 << 24) /* Status read check */
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#define SELRW (0x1 << 21) /* 0:read 1:write */
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#define DOADR_E (0x1 << 20) /* Address stage execute */
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#define ADRCNT_1 (0x00 << 18) /* Address data bytes: 1byte */
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#define ADRCNT_2 (0x01 << 18) /* Address data bytes: 2byte */
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#define ADRCNT_3 (0x02 << 18) /* Address data bytes: 3byte */
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#define ADRCNT_4 (0x03 << 18) /* Address data bytes: 4byte */
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#define DOCMD2_E (0x1 << 17) /* 2nd cmd stage execute */
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#define DOCMD1_E (0x1 << 16) /* 1st cmd stage execute */
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/* FLINTDMACR control bits */
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#define ESTERINTE (0x1 << 24) /* ECC error interrupt enable */
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#define AC1CLR (0x1 << 19) /* ECC FIFO clear */
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#define AC0CLR (0x1 << 18) /* Data FIFO clear */
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#define ECERB (0x1 << 9) /* ECC error */
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#define STERB (0x1 << 8) /* Status error */
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#define STERINTE (0x1 << 4) /* Status error enable */
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/* FLTRCR control bits */
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#define TRSTRT (0x1 << 0) /* translation start */
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#define TREND (0x1 << 1) /* translation end */
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/*
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* FLHOLDCR control bits
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*
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* HOLDEN: Bus Occupancy Enable (inverted)
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* Enable this bit when the external bus might be used in between transfers.
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* If not set and the bus gets used by other modules, a deadlock occurs.
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*/
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#define HOLDEN (0x1 << 0)
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/* FL4ECCCR control bits */
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#define _4ECCFA (0x1 << 2) /* 4 symbols correct fault */
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#define _4ECCEND (0x1 << 1) /* 4 symbols end */
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#define _4ECCEXST (0x1 << 0) /* 4 symbols exist */
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#define LOOP_TIMEOUT_MAX 0x00010000
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enum flctl_ecc_res_t {
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FL_SUCCESS,
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FL_REPAIRABLE,
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FL_ERROR,
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FL_TIMEOUT
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};
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struct sh_flctl {
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struct mtd_info mtd;
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struct nand_chip chip;
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struct platform_device *pdev;
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struct dev_pm_qos_request pm_qos;
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void __iomem *reg;
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uint8_t done_buff[2048 + 64]; /* max size 2048 + 64 */
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int read_bytes;
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int index;
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int seqin_column; /* column in SEQIN cmd */
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int seqin_page_addr; /* page_addr in SEQIN cmd */
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uint32_t seqin_read_cmd; /* read cmd in SEQIN cmd */
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int erase1_page_addr; /* page_addr in ERASE1 cmd */
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uint32_t erase_ADRCNT; /* bits of FLCMDCR in ERASE1 cmd */
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uint32_t rw_ADRCNT; /* bits of FLCMDCR in READ WRITE cmd */
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uint32_t flcmncr_base; /* base value of FLCMNCR */
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uint32_t flintdmacr_base; /* irq enable bits */
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unsigned page_size:1; /* NAND page size (0 = 512, 1 = 2048) */
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unsigned hwecc:1; /* Hardware ECC (0 = disabled, 1 = enabled) */
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unsigned holden:1; /* Hardware has FLHOLDCR and HOLDEN is set */
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unsigned qos_request:1; /* QoS request to prevent deep power shutdown */
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};
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struct sh_flctl_platform_data {
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struct mtd_partition *parts;
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int nr_parts;
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unsigned long flcmncr_val;
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unsigned has_hwecc:1;
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unsigned use_holden:1;
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};
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static inline struct sh_flctl *mtd_to_flctl(struct mtd_info *mtdinfo)
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{
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return container_of(mtdinfo, struct sh_flctl, mtd);
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}
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#endif /* __SH_FLCTL_H__ */
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