143 lines
4.4 KiB
C
143 lines
4.4 KiB
C
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/*
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* arch/sh/boards/st/common/mb588.c
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*
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* Copyright (C) 2007 STMicroelectronics Limited
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* Author: Pawel Moll <pawel.moll@st.com>
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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* STMicroelectronics NAND Flash STEM board
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*
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* Jumper Settings:
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* J1 "CS Routing"
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* 1-2: STEM_notCS0
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* 2-3: STEM_notCS1 [1]
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*
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* J2 "RBn Routing"
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* Not used [2]
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*
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* J3 "Write Protect"
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* open: unprotected
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* closed: protected
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*
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* CN2
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* Do Not Fit
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*
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* Notes:
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* [1] Some host boards generate the STEM_notCSx signals by sub-decoding an
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* EMI bank based on the EMI address accessed (eg mb705 EPLD). The
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* stm_nand_emi driver accesses NAND via the EMI buffer and will
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* therefore work as expected with sub-decoded EMI banks. However, if
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* using the NAND controller (ie stm_nand_flex or stm_nand_afm), the EMI
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* buffer is bi-passed and the EMI address pads will remain high.
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* Consequently, is it only possible to use the NAND controller if the
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* decoding logic expects the address pads to be high when asserting the
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* CS (typically the 'upper' sub-bank).
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*
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* [2] The STEM2 interface now accepts the NAND ready/not-busy signal (eg
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* mb837). To support this option, while remaining backwards compatible
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* with previous boards, we use STEM_NAND_RDY, defaulting to 0 if not
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* defined.
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*
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* [3] The mb588 board is a generic NAND STEM module and may be populated
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* with any compatible NAND device. The timing paramters specified
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* below have been chosen to work with a large number of NAND devices.
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* Considerable improvement in performance can be gained by tuning the
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* parameters to the particular NAND device being used.
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*
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* [4] Some additional host board setup may be required to use proper CS
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* signal signal - see "arch/sh/include/mach-<board>/mach/stem.h" for
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* more information.
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*/
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/nand.h>
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#include <linux/stm/nand.h>
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#include <linux/stm/platform.h>
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#include <linux/stm/emi.h>
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#include <mach/stem.h>
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#if defined(CONFIG_CPU_SUBTYPE_STX7105)
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#include <linux/stm/stx7105.h>
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#elif defined(CONFIG_CPU_SUBTYPE_STX7111)
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#include <linux/stm/stx7111.h>
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#elif defined(CONFIG_CPU_SUBTYPE_STX7200)
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#include <linux/stm/stx7200.h>
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#elif defined(CONFIG_CPU_SUBTYPE_STX7108)
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#include <linux/stm/stx7108.h>
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#else
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error Unsupported SOC.
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#endif
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struct stm_nand_bank_data nand_bank_data = {
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.csn = STEM_CS0_BANK,
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.emi_withinbankoffset = STEM_CS0_OFFSET,
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.options = NAND_NO_AUTOINCR | NAND_USE_FLASH_BBT,
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.nr_partitions = 2,
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.partitions = (struct mtd_partition []) {
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{
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.name = "NAND Flash S1",
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.offset = 0,
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.size = 0x00800000
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}, {
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.name = "NAND Flash S2",
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.offset = MTDPART_OFS_NXTBLK,
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.size = MTDPART_SIZ_FULL
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},
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},
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/* Timing parameters for generic NAND device. For improved performance,
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* tune according to device on mb588 (see note [3]) */
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.timing_data = &(struct stm_nand_timing_data) {
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.sig_setup = 50, /* times in ns */
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.sig_hold = 50,
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.CE_deassert = 0,
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.WE_to_RBn = 100,
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.wr_on = 50,
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.wr_off = 50,
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.rd_on = 50,
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.rd_off = 50,
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.chip_delay = 50, /* in us */
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},
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};
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/* NAND ready/not-busy signal (see note [2] above) */
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#ifndef STEM_NAND_RDY
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#define STEM_NAND_RDY 0
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#endif
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static int __init mb588_init(void)
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{
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#if defined(CONFIG_CPU_SUBTYPE_STX7105)
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stx7105_configure_nand(&(struct stm_nand_config) {
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.driver = stm_nand_flex,
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.nr_banks = 1,
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.banks = &nand_bank_data,
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.rbn.flex_connected = STEM_NAND_RDY,});
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#elif defined(CONFIG_CPU_SUBTYPE_STX7111)
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stx7111_configure_nand(&(struct stm_nand_config) {
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.driver = stm_nand_flex,
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.nr_banks = 1,
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.banks = &nand_bank_data,
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.rbn.flex_connected = STEM_NAND_RDY,});
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#elif defined(CONFIG_CPU_SUBTYPE_STX7200)
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stx7200_configure_nand(&(struct stm_nand_config) {
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.driver = stm_nand_flex,
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.nr_banks = 1,
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.banks = &nand_bank_data,
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.rbn.flex_connected = STEM_NAND_RDY,});
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#elif defined(CONFIG_CPU_SUBTYPE_STX7108)
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stx7108_configure_nand(&(struct stm_nand_config) {
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.driver = stm_nand_flex,
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.nr_banks = 1,
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.banks = &nand_bank_data,
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.rbn.flex_connected = STEM_NAND_RDY,});
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#endif
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return 0;
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}
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arch_initcall(mb588_init);
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