include/asm-arm/arch-ixp2000/platform.h

   1 /*
   2  * include/asm-arm/arch-ixp2000/platform.h
   3  *
   4  * Various bits of code used by platform-level code.
   5  *
   6  * Author: Deepak Saxena <dsaxena@plexity.net>
   7  *
   8  * Copyright 2004 (c) MontaVista Software, Inc.
   9  *
  10  * This file is licensed under  the terms of the GNU General Public
  11  * License version 2. This program is licensed "as is" without any
  12  * warranty of any kind, whether express or implied.
  13  */
  14
  15
  16 #ifndef __ASSEMBLY__
  17
  18 /*
  19  * The IXP2400 B0 silicon contains an erratum (#66) that causes writes
  20  * to on-chip I/O register to not complete fully. What this means is
  21  * that if you have a write to on-chip I/O followed by a back-to-back
  22  * read or write, the first write will happen twice. OR...if it's
  23  * not a back-to-back transaction, the read or write will generate
  24  * incorrect data.
  25  *
  26  * The official work around for this is to set the on-chip I/O regions
  27  * as XCB=101 and then force a read-back from the register.
  28  *
  29  */
  30 #if defined(CONFIG_ARCH_ENP2611) || defined(CONFIG_ARCH_IXDP2400) || defined(CONFIG_ARCH_IXDP2401)
  31
  32 #include <asm/system.h>         /* Pickup local_irq_ functions */
  33
  34 static inline void ixp2000_reg_write(volatile unsigned long *reg, unsigned long val)
  35 {
  36         volatile unsigned long dummy;
  37         unsigned long flags;
  38
  39         local_irq_save(flags);
  40         *reg = val;
  41         barrier();
  42         dummy = *reg;
  43         local_irq_restore(flags);
  44 }
  45 #else
  46 #define ixp2000_reg_write(reg, val) (*reg = val)
  47 #endif  /* IXDP2400 || IXDP2401 */
  48
  49 /*
  50  * Boards may multiplex different devices on the 2nd channel of
  51  * the slowport interface that each need different configuration
  52  * settings.  For example, the IXDP2400 uses channel 2 on the interface
  53  * to access the CPLD, the switch fabric card, and the media card.  Each
  54  * one needs a different mode so drivers must save/restore the mode
  55  * before and after each operation.
  56  *
  57  * acquire_slowport(&your_config);
  58  * ...
  59  * do slowport operations
  60  * ...
  61  * release_slowport();
  62  *
  63  * Note that while you have the slowport, you are holding a spinlock,
  64  * so your code should be written as if you explicitly acquired a lock.
  65  *
  66  * The configuration only affects device 2 on the slowport, so the
  67  * MTD map driver does not acquire/release the slowport.
  68  */
  69 struct slowport_cfg {
  70         unsigned long CCR;      /* Clock divide */
  71         unsigned long WTC;      /* Write Timing Control */
  72         unsigned long RTC;      /* Read Timing Control */
  73         unsigned long PCR;      /* Protocol Control Register */
  74         unsigned long ADC;      /* Address/Data Width Control */
  75 };
  76
  77
  78 void ixp2000_acquire_slowport(struct slowport_cfg *, struct slowport_cfg *);
  79 void ixp2000_release_slowport(struct slowport_cfg *);
  80
  81 /*
  82  * IXP2400 A0/A1 and  IXP2800 A0/A1/A2 have broken slowport that requires
  83  * tweaking of addresses in the MTD driver.
  84  */
  85 static inline unsigned ixp2000_has_broken_slowport(void)
  86 {
  87         unsigned long id = *IXP2000_PROD_ID;
  88         unsigned long id_prod = id & (IXP2000_MAJ_PROD_TYPE_MASK |
  89                                       IXP2000_MIN_PROD_TYPE_MASK);
  90         return (((id_prod ==
  91                   /* fixed in IXP2400-B0 */
  92                   (IXP2000_MAJ_PROD_TYPE_IXP2000 |
  93                    IXP2000_MIN_PROD_TYPE_IXP2400)) &&
  94                  ((id & IXP2000_MAJ_REV_MASK) == 0)) ||
  95                 ((id_prod ==
  96                   /* fixed in IXP2800-B0 */
  97                   (IXP2000_MAJ_PROD_TYPE_IXP2000 |
  98                    IXP2000_MIN_PROD_TYPE_IXP2800)) &&
  99                  ((id & IXP2000_MAJ_REV_MASK) == 0)) ||
 100                 ((id_prod ==
 101                   /* fixed in IXP2850-B0 */
 102                   (IXP2000_MAJ_PROD_TYPE_IXP2000 |
 103                    IXP2000_MIN_PROD_TYPE_IXP2850)) &&
 104                  ((id & IXP2000_MAJ_REV_MASK) == 0)));
 105 }
 106
 107 static inline unsigned int ixp2000_has_flash(void)
 108 {
 109         return ((*IXP2000_STRAP_OPTIONS) & (CFG_BOOT_PROM));
 110 }
 111
 112 static inline unsigned int ixp2000_is_pcimaster(void)
 113 {
 114         return ((*IXP2000_STRAP_OPTIONS) & (CFG_PCI_BOOT_HOST));
 115 }
 116
 117 void ixp2000_map_io(void);
 118 void ixp2000_init_irq(void);
 119 void ixp2000_init_time(unsigned long);
 120 unsigned long ixp2000_gettimeoffset(void);
 121
 122 struct pci_sys_data;
 123
 124 u32 *ixp2000_pci_config_addr(unsigned int bus, unsigned int devfn, int where);
 125 void ixp2000_pci_preinit(void);
 126 int ixp2000_pci_setup(int, struct pci_sys_data*);
 127 struct pci_bus* ixp2000_pci_scan_bus(int, struct pci_sys_data*);
 128 int ixp2000_pci_read_config(struct pci_bus*, unsigned int, int, int, u32 *);
 129 int ixp2000_pci_write_config(struct pci_bus*, unsigned int, int, int, u32);
 130
 131 /*
 132  * Several of the IXP2000 systems have banked flash so we need to extend the
 133  * flash_platform_data structure with some private pointers
 134  */
 135 struct ixp2000_flash_data {
 136         struct flash_platform_data *platform_data;
 137         int nr_banks;
 138         unsigned long (*bank_setup)(unsigned long);
 139 };
 140
 141 struct ixp2000_i2c_pins {
 142         unsigned long sda_pin;
 143         unsigned long scl_pin;
 144 };
 145
 146
 147 #endif /*  !__ASSEMBLY__ */