496 lines
13 KiB
C
496 lines
13 KiB
C
/* dilnetpc.c -- MTD map driver for SSV DIL/Net PC Boards "DNP" and "ADNP"
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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; either version 2 of the License, or
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* (at your option) any later version.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*
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* $Id: dilnetpc.c,v 1.17 2004/11/28 09:40:39 dwmw2 Exp $
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*
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* The DIL/Net PC is a tiny embedded PC board made by SSV Embedded Systems
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* featuring the AMD Elan SC410 processor. There are two variants of this
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* board: DNP/1486 and ADNP/1486. The DNP version has 2 megs of flash
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* ROM (Intel 28F016S3) and 8 megs of DRAM, the ADNP version has 4 megs
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* flash and 16 megs of RAM.
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* For details, see http://www.ssv-embedded.de/ssv/pc104/p169.htm
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* and http://www.ssv-embedded.de/ssv/pc104/p170.htm
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/concat.h>
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/*
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** The DIL/NetPC keeps its BIOS in two distinct flash blocks.
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** Destroying any of these blocks transforms the DNPC into
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** a paperweight (albeit not a very useful one, considering
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** it only weighs a few grams).
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**
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** Therefore, the BIOS blocks must never be erased or written to
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** except by people who know exactly what they are doing (e.g.
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** to install a BIOS update). These partitions are marked read-only
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** by default, but can be made read/write by undefining
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** DNPC_BIOS_BLOCKS_WRITEPROTECTED:
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*/
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#define DNPC_BIOS_BLOCKS_WRITEPROTECTED
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/*
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** The ID string (in ROM) is checked to determine whether we
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** are running on a DNP/1486 or ADNP/1486
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*/
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#define BIOSID_BASE 0x000fe100
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#define ID_DNPC "DNP1486"
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#define ID_ADNP "ADNP1486"
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/*
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** Address where the flash should appear in CPU space
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*/
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#define FLASH_BASE 0x2000000
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/*
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** Chip Setup and Control (CSC) indexed register space
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*/
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#define CSC_INDEX 0x22
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#define CSC_DATA 0x23
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#define CSC_MMSWAR 0x30 /* MMS window C-F attributes register */
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#define CSC_MMSWDSR 0x31 /* MMS window C-F device select register */
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#define CSC_RBWR 0xa7 /* GPIO Read-Back/Write Register B */
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#define CSC_CR 0xd0 /* internal I/O device disable/Echo */
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/* Z-bus/configuration register */
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#define CSC_PCCMDCR 0xf1 /* PC card mode and DMA control register */
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/*
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** PC Card indexed register space:
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*/
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#define PCC_INDEX 0x3e0
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#define PCC_DATA 0x3e1
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#define PCC_AWER_B 0x46 /* Socket B Address Window enable register */
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#define PCC_MWSAR_1_Lo 0x58 /* memory window 1 start address low register */
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#define PCC_MWSAR_1_Hi 0x59 /* memory window 1 start address high register */
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#define PCC_MWEAR_1_Lo 0x5A /* memory window 1 stop address low register */
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#define PCC_MWEAR_1_Hi 0x5B /* memory window 1 stop address high register */
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#define PCC_MWAOR_1_Lo 0x5C /* memory window 1 address offset low register */
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#define PCC_MWAOR_1_Hi 0x5D /* memory window 1 address offset high register */
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/*
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** Access to SC4x0's Chip Setup and Control (CSC)
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** and PC Card (PCC) indexed registers:
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*/
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static inline void setcsc(int reg, unsigned char data)
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{
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outb(reg, CSC_INDEX);
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outb(data, CSC_DATA);
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}
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static inline unsigned char getcsc(int reg)
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{
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outb(reg, CSC_INDEX);
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return(inb(CSC_DATA));
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}
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static inline void setpcc(int reg, unsigned char data)
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{
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outb(reg, PCC_INDEX);
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outb(data, PCC_DATA);
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}
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static inline unsigned char getpcc(int reg)
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{
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outb(reg, PCC_INDEX);
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return(inb(PCC_DATA));
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}
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/*
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************************************************************
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** Enable access to DIL/NetPC's flash by mapping it into
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** the SC4x0's MMS Window C.
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************************************************************
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*/
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static void dnpc_map_flash(unsigned long flash_base, unsigned long flash_size)
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{
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unsigned long flash_end = flash_base + flash_size - 1;
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/*
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** enable setup of MMS windows C-F:
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*/
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/* - enable PC Card indexed register space */
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setcsc(CSC_CR, getcsc(CSC_CR) | 0x2);
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/* - set PC Card controller to operate in standard mode */
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setcsc(CSC_PCCMDCR, getcsc(CSC_PCCMDCR) & ~1);
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/*
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** Program base address and end address of window
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** where the flash ROM should appear in CPU address space
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*/
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setpcc(PCC_MWSAR_1_Lo, (flash_base >> 12) & 0xff);
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setpcc(PCC_MWSAR_1_Hi, (flash_base >> 20) & 0x3f);
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setpcc(PCC_MWEAR_1_Lo, (flash_end >> 12) & 0xff);
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setpcc(PCC_MWEAR_1_Hi, (flash_end >> 20) & 0x3f);
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/* program offset of first flash location to appear in this window (0) */
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setpcc(PCC_MWAOR_1_Lo, ((0 - flash_base) >> 12) & 0xff);
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setpcc(PCC_MWAOR_1_Hi, ((0 - flash_base)>> 20) & 0x3f);
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/* set attributes for MMS window C: non-cacheable, write-enabled */
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setcsc(CSC_MMSWAR, getcsc(CSC_MMSWAR) & ~0x11);
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/* select physical device ROMCS0 (i.e. flash) for MMS Window C */
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setcsc(CSC_MMSWDSR, getcsc(CSC_MMSWDSR) & ~0x03);
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/* enable memory window 1 */
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setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) | 0x02);
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/* now disable PC Card indexed register space again */
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setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
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}
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/*
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************************************************************
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** Disable access to DIL/NetPC's flash by mapping it into
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** the SC4x0's MMS Window C.
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************************************************************
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*/
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static void dnpc_unmap_flash(void)
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{
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/* - enable PC Card indexed register space */
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setcsc(CSC_CR, getcsc(CSC_CR) | 0x2);
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/* disable memory window 1 */
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setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) & ~0x02);
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/* now disable PC Card indexed register space again */
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setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
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}
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/*
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************************************************************
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** Enable/Disable VPP to write to flash
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************************************************************
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*/
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static DEFINE_SPINLOCK(dnpc_spin);
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static int vpp_counter = 0;
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/*
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** This is what has to be done for the DNP board ..
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*/
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static void dnp_set_vpp(struct map_info *not_used, int on)
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{
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spin_lock_irq(&dnpc_spin);
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if (on)
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{
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if(++vpp_counter == 1)
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setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x4);
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}
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else
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{
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if(--vpp_counter == 0)
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setcsc(CSC_RBWR, getcsc(CSC_RBWR) | 0x4);
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else if(vpp_counter < 0)
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BUG();
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}
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spin_unlock_irq(&dnpc_spin);
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}
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/*
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** .. and this the ADNP version:
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*/
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static void adnp_set_vpp(struct map_info *not_used, int on)
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{
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spin_lock_irq(&dnpc_spin);
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if (on)
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{
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if(++vpp_counter == 1)
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setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x8);
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}
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else
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{
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if(--vpp_counter == 0)
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setcsc(CSC_RBWR, getcsc(CSC_RBWR) | 0x8);
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else if(vpp_counter < 0)
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BUG();
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}
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spin_unlock_irq(&dnpc_spin);
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}
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#define DNP_WINDOW_SIZE 0x00200000 /* DNP flash size is 2MiB */
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#define ADNP_WINDOW_SIZE 0x00400000 /* ADNP flash size is 4MiB */
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#define WINDOW_ADDR FLASH_BASE
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static struct map_info dnpc_map = {
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.name = "ADNP Flash Bank",
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.size = ADNP_WINDOW_SIZE,
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.bankwidth = 1,
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.set_vpp = adnp_set_vpp,
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.phys = WINDOW_ADDR
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};
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/*
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** The layout of the flash is somewhat "strange":
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**
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** 1. 960 KiB (15 blocks) : Space for ROM Bootloader and user data
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** 2. 64 KiB (1 block) : System BIOS
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** 3. 960 KiB (15 blocks) : User Data (DNP model) or
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** 3. 3008 KiB (47 blocks) : User Data (ADNP model)
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** 4. 64 KiB (1 block) : System BIOS Entry
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*/
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static struct mtd_partition partition_info[]=
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{
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{
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.name = "ADNP boot",
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.offset = 0,
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.size = 0xf0000,
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},
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{
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.name = "ADNP system BIOS",
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.offset = MTDPART_OFS_NXTBLK,
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.size = 0x10000,
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#ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
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.mask_flags = MTD_WRITEABLE,
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#endif
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},
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{
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.name = "ADNP file system",
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.offset = MTDPART_OFS_NXTBLK,
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.size = 0x2f0000,
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},
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{
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.name = "ADNP system BIOS entry",
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.offset = MTDPART_OFS_NXTBLK,
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.size = MTDPART_SIZ_FULL,
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#ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
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.mask_flags = MTD_WRITEABLE,
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#endif
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},
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};
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#define NUM_PARTITIONS (sizeof(partition_info)/sizeof(partition_info[0]))
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static struct mtd_info *mymtd;
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static struct mtd_info *lowlvl_parts[NUM_PARTITIONS];
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static struct mtd_info *merged_mtd;
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/*
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** "Highlevel" partition info:
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**
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** Using the MTD concat layer, we can re-arrange partitions to our
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** liking: we construct a virtual MTD device by concatenating the
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** partitions, specifying the sequence such that the boot block
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** is immediately followed by the filesystem block (i.e. the stupid
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** system BIOS block is mapped to a different place). When re-partitioning
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** this concatenated MTD device, we can set the boot block size to
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** an arbitrary (though erase block aligned) value i.e. not one that
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** is dictated by the flash's physical layout. We can thus set the
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** boot block to be e.g. 64 KB (which is fully sufficient if we want
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** to boot an etherboot image) or to -say- 1.5 MB if we want to boot
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** a large kernel image. In all cases, the remainder of the flash
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** is available as file system space.
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*/
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static struct mtd_partition higlvl_partition_info[]=
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{
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{
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.name = "ADNP boot block",
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.offset = 0,
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.size = CONFIG_MTD_DILNETPC_BOOTSIZE,
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},
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{
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.name = "ADNP file system space",
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.offset = MTDPART_OFS_NXTBLK,
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.size = ADNP_WINDOW_SIZE-CONFIG_MTD_DILNETPC_BOOTSIZE-0x20000,
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},
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{
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.name = "ADNP system BIOS + BIOS Entry",
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.offset = MTDPART_OFS_NXTBLK,
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.size = MTDPART_SIZ_FULL,
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#ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
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.mask_flags = MTD_WRITEABLE,
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#endif
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},
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};
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#define NUM_HIGHLVL_PARTITIONS (sizeof(higlvl_partition_info)/sizeof(partition_info[0]))
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static int dnp_adnp_probe(void)
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{
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char *biosid, rc = -1;
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biosid = (char*)ioremap(BIOSID_BASE, 16);
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if(biosid)
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{
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if(!strcmp(biosid, ID_DNPC))
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rc = 1; /* this is a DNPC */
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else if(!strcmp(biosid, ID_ADNP))
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rc = 0; /* this is a ADNPC */
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}
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iounmap((void *)biosid);
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return(rc);
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}
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static int __init init_dnpc(void)
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{
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int is_dnp;
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/*
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** determine hardware (DNP/ADNP/invalid)
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*/
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if((is_dnp = dnp_adnp_probe()) < 0)
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return -ENXIO;
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/*
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** Things are set up for ADNP by default
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** -> modify all that needs to be different for DNP
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*/
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if(is_dnp)
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{ /*
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** Adjust window size, select correct set_vpp function.
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** The partitioning scheme is identical on both DNP
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** and ADNP except for the size of the third partition.
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*/
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int i;
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dnpc_map.size = DNP_WINDOW_SIZE;
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dnpc_map.set_vpp = dnp_set_vpp;
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partition_info[2].size = 0xf0000;
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/*
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** increment all string pointers so the leading 'A' gets skipped,
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** thus turning all occurrences of "ADNP ..." into "DNP ..."
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*/
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++dnpc_map.name;
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for(i = 0; i < NUM_PARTITIONS; i++)
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++partition_info[i].name;
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higlvl_partition_info[1].size = DNP_WINDOW_SIZE -
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CONFIG_MTD_DILNETPC_BOOTSIZE - 0x20000;
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for(i = 0; i < NUM_HIGHLVL_PARTITIONS; i++)
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++higlvl_partition_info[i].name;
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}
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printk(KERN_NOTICE "DIL/Net %s flash: 0x%lx at 0x%lx\n",
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is_dnp ? "DNPC" : "ADNP", dnpc_map.size, dnpc_map.phys);
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dnpc_map.virt = ioremap_nocache(dnpc_map.phys, dnpc_map.size);
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dnpc_map_flash(dnpc_map.phys, dnpc_map.size);
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if (!dnpc_map.virt) {
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printk("Failed to ioremap_nocache\n");
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return -EIO;
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}
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simple_map_init(&dnpc_map);
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printk("FLASH virtual address: 0x%p\n", dnpc_map.virt);
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mymtd = do_map_probe("jedec_probe", &dnpc_map);
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if (!mymtd)
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mymtd = do_map_probe("cfi_probe", &dnpc_map);
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/*
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** If flash probes fail, try to make flashes accessible
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** at least as ROM. Ajust erasesize in this case since
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** the default one (128M) will break our partitioning
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*/
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if (!mymtd)
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if((mymtd = do_map_probe("map_rom", &dnpc_map)))
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mymtd->erasesize = 0x10000;
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if (!mymtd) {
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iounmap(dnpc_map.virt);
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return -ENXIO;
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}
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mymtd->owner = THIS_MODULE;
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/*
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** Supply pointers to lowlvl_parts[] array to add_mtd_partitions()
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** -> add_mtd_partitions() will _not_ register MTD devices for
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** the partitions, but will instead store pointers to the MTD
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** objects it creates into our lowlvl_parts[] array.
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** NOTE: we arrange the pointers such that the sequence of the
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** partitions gets re-arranged: partition #2 follows
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** partition #0.
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*/
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partition_info[0].mtdp = &lowlvl_parts[0];
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partition_info[1].mtdp = &lowlvl_parts[2];
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partition_info[2].mtdp = &lowlvl_parts[1];
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partition_info[3].mtdp = &lowlvl_parts[3];
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add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
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/*
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** now create a virtual MTD device by concatenating the for partitions
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** (in the sequence given by the lowlvl_parts[] array.
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*/
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merged_mtd = mtd_concat_create(lowlvl_parts, NUM_PARTITIONS, "(A)DNP Flash Concatenated");
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if(merged_mtd)
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{ /*
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** now partition the new device the way we want it. This time,
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** we do not supply mtd pointers in higlvl_partition_info, so
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** add_mtd_partitions() will register the devices.
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*/
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add_mtd_partitions(merged_mtd, higlvl_partition_info, NUM_HIGHLVL_PARTITIONS);
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}
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return 0;
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}
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static void __exit cleanup_dnpc(void)
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{
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if(merged_mtd) {
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del_mtd_partitions(merged_mtd);
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mtd_concat_destroy(merged_mtd);
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}
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if (mymtd) {
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del_mtd_partitions(mymtd);
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map_destroy(mymtd);
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}
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if (dnpc_map.virt) {
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iounmap(dnpc_map.virt);
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dnpc_unmap_flash();
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dnpc_map.virt = NULL;
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}
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}
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module_init(init_dnpc);
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module_exit(cleanup_dnpc);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Sysgo Real-Time Solutions GmbH");
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MODULE_DESCRIPTION("MTD map driver for SSV DIL/NetPC DNP & ADNP");
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