satip-axe/kernel/arch/sh/boards/mach-st/mb588.c
2015-03-26 17:24:57 +01:00

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);