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