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e2f6bce8d9
FSMC controllers provide registers to program the required timing values for attached NAND device. The timing values used until now are relaxed and should work for all devices. Although, for read/write performance improvements, the fsmc nand driver should accept nand timings as a platform data and program the timing parameters into fsmc registers accordingly. This patch implements this modification. Additionally, it programs the default timing parameters if these are not passed via platform data. Signed-off-by: Vipin Kumar <vipin.kumar@st.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
178 lines
4.5 KiB
C
178 lines
4.5 KiB
C
/*
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* incude/mtd/fsmc.h
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*
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* ST Microelectronics
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* Flexible Static Memory Controller (FSMC)
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* platform data interface and header file
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*
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* Copyright © 2010 ST Microelectronics
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* Vipin Kumar <vipin.kumar@st.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#ifndef __MTD_FSMC_H
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#define __MTD_FSMC_H
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/physmap.h>
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#include <linux/types.h>
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#include <linux/mtd/partitions.h>
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#include <asm/param.h>
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#define FSMC_NAND_BW8 1
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#define FSMC_NAND_BW16 2
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#define FSMC_MAX_NOR_BANKS 4
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#define FSMC_MAX_NAND_BANKS 4
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#define FSMC_FLASH_WIDTH8 1
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#define FSMC_FLASH_WIDTH16 2
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struct fsmc_nor_bank_regs {
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uint32_t ctrl;
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uint32_t ctrl_tim;
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};
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/* ctrl register definitions */
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#define BANK_ENABLE (1 << 0)
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#define MUXED (1 << 1)
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#define NOR_DEV (2 << 2)
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#define WIDTH_8 (0 << 4)
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#define WIDTH_16 (1 << 4)
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#define RSTPWRDWN (1 << 6)
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#define WPROT (1 << 7)
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#define WRT_ENABLE (1 << 12)
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#define WAIT_ENB (1 << 13)
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/* ctrl_tim register definitions */
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struct fsmc_nand_bank_regs {
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uint32_t pc;
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uint32_t sts;
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uint32_t comm;
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uint32_t attrib;
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uint32_t ioata;
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uint32_t ecc1;
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uint32_t ecc2;
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uint32_t ecc3;
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};
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#define FSMC_NOR_REG_SIZE 0x40
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struct fsmc_regs {
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struct fsmc_nor_bank_regs nor_bank_regs[FSMC_MAX_NOR_BANKS];
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uint8_t reserved_1[0x40 - 0x20];
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struct fsmc_nand_bank_regs bank_regs[FSMC_MAX_NAND_BANKS];
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uint8_t reserved_2[0xfe0 - 0xc0];
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uint32_t peripid0; /* 0xfe0 */
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uint32_t peripid1; /* 0xfe4 */
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uint32_t peripid2; /* 0xfe8 */
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uint32_t peripid3; /* 0xfec */
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uint32_t pcellid0; /* 0xff0 */
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uint32_t pcellid1; /* 0xff4 */
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uint32_t pcellid2; /* 0xff8 */
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uint32_t pcellid3; /* 0xffc */
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};
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#define FSMC_BUSY_WAIT_TIMEOUT (1 * HZ)
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/* pc register definitions */
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#define FSMC_RESET (1 << 0)
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#define FSMC_WAITON (1 << 1)
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#define FSMC_ENABLE (1 << 2)
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#define FSMC_DEVTYPE_NAND (1 << 3)
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#define FSMC_DEVWID_8 (0 << 4)
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#define FSMC_DEVWID_16 (1 << 4)
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#define FSMC_ECCEN (1 << 6)
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#define FSMC_ECCPLEN_512 (0 << 7)
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#define FSMC_ECCPLEN_256 (1 << 7)
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#define FSMC_TCLR_1 (1)
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#define FSMC_TCLR_SHIFT (9)
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#define FSMC_TCLR_MASK (0xF)
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#define FSMC_TAR_1 (1)
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#define FSMC_TAR_SHIFT (13)
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#define FSMC_TAR_MASK (0xF)
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/* sts register definitions */
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#define FSMC_CODE_RDY (1 << 15)
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/* comm register definitions */
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#define FSMC_TSET_0 0
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#define FSMC_TSET_SHIFT 0
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#define FSMC_TSET_MASK 0xFF
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#define FSMC_TWAIT_6 6
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#define FSMC_TWAIT_SHIFT 8
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#define FSMC_TWAIT_MASK 0xFF
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#define FSMC_THOLD_4 4
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#define FSMC_THOLD_SHIFT 16
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#define FSMC_THOLD_MASK 0xFF
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#define FSMC_THIZ_1 1
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#define FSMC_THIZ_SHIFT 24
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#define FSMC_THIZ_MASK 0xFF
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/*
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* There are 13 bytes of ecc for every 512 byte block in FSMC version 8
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* and it has to be read consecutively and immediately after the 512
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* byte data block for hardware to generate the error bit offsets
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* Managing the ecc bytes in the following way is easier. This way is
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* similar to oobfree structure maintained already in u-boot nand driver
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*/
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#define MAX_ECCPLACE_ENTRIES 32
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struct fsmc_nand_eccplace {
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uint8_t offset;
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uint8_t length;
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};
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struct fsmc_eccplace {
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struct fsmc_nand_eccplace eccplace[MAX_ECCPLACE_ENTRIES];
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};
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struct fsmc_nand_timings {
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uint8_t tclr;
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uint8_t tar;
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uint8_t thiz;
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uint8_t thold;
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uint8_t twait;
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uint8_t tset;
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};
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/**
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* fsmc_nand_platform_data - platform specific NAND controller config
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* @partitions: partition table for the platform, use a default fallback
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* if this is NULL
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* @nr_partitions: the number of partitions in the previous entry
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* @options: different options for the driver
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* @width: bus width
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* @bank: default bank
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* @select_bank: callback to select a certain bank, this is
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* platform-specific. If the controller only supports one bank
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* this may be set to NULL
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*/
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struct fsmc_nand_platform_data {
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struct fsmc_nand_timings *nand_timings;
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struct mtd_partition *partitions;
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unsigned int nr_partitions;
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unsigned int options;
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unsigned int width;
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unsigned int bank;
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/* CLE, ALE offsets */
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unsigned long cle_off;
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unsigned long ale_off;
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void (*select_bank)(uint32_t bank, uint32_t busw);
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};
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extern int __init fsmc_nor_init(struct platform_device *pdev,
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unsigned long base, uint32_t bank, uint32_t width);
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extern void __init fsmc_init_board_info(struct platform_device *pdev,
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struct mtd_partition *partitions, unsigned int nr_partitions,
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unsigned int width);
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#endif /* __MTD_FSMC_H */
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