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platform.h

/*
 * arch/arm/mach-ixp2000/include/mach/platform.h
 *
 * Various bits of code used by platform-level code.
 *
 * Author: Deepak Saxena <dsaxena@plexity.net>
 *
 * Copyright 2004 (c) MontaVista Software, Inc. 
 * 
 * This file is licensed under  the terms of the GNU General Public 
 * License version 2. This program is licensed "as is" without any 
 * warranty of any kind, whether express or implied.
 */


#ifndef __ASSEMBLY__

static inline unsigned long ixp2000_reg_read(volatile void *reg)
{
      return *((volatile unsigned long *)reg);
}

static inline void ixp2000_reg_write(volatile void *reg, unsigned long val)
{
      *((volatile unsigned long *)reg) = val;
}

/*
 * On the IXP2400, we can't use XCB=000 due to chip bugs.  We use
 * XCB=101 instead, but that makes all I/O accesses bufferable.  This
 * is not a problem in general, but we do have to be slightly more
 * careful because I/O writes are no longer automatically flushed out
 * of the write buffer.
 *
 * In cases where we want to make sure that a write has been flushed
 * out of the write buffer before we proceed, for example when masking
 * a device interrupt before re-enabling IRQs in CPSR, we can use this
 * function, ixp2000_reg_wrb, which performs a write, a readback, and
 * issues a dummy instruction dependent on the value of the readback
 * (mov rX, rX) to make sure that the readback has completed before we
 * continue.
 */
static inline void ixp2000_reg_wrb(volatile void *reg, unsigned long val)
{
      unsigned long dummy;

      *((volatile unsigned long *)reg) = val;

      dummy = *((volatile unsigned long *)reg);
      __asm__ __volatile__("mov %0, %0" : "+r" (dummy));
}

/*
 * Boards may multiplex different devices on the 2nd channel of 
 * the slowport interface that each need different configuration 
 * settings.  For example, the IXDP2400 uses channel 2 on the interface 
 * to access the CPLD, the switch fabric card, and the media card.  Each
 * one needs a different mode so drivers must save/restore the mode 
 * before and after each operation.  
 *
 * acquire_slowport(&your_config);
 * ...
 * do slowport operations
 * ...
 * release_slowport();
 *
 * Note that while you have the slowport, you are holding a spinlock,
 * so your code should be written as if you explicitly acquired a lock.
 *
 * The configuration only affects device 2 on the slowport, so the
 * MTD map driver does not acquire/release the slowport.  
 */
struct slowport_cfg {
      unsigned long CCR;      /* Clock divide */
      unsigned long WTC;      /* Write Timing Control */
      unsigned long RTC;      /* Read Timing Control */
      unsigned long PCR;      /* Protocol Control Register */
      unsigned long ADC;      /* Address/Data Width Control */
};


void ixp2000_acquire_slowport(struct slowport_cfg *, struct slowport_cfg *);
void ixp2000_release_slowport(struct slowport_cfg *);

/*
 * IXP2400 A0/A1 and  IXP2800 A0/A1/A2 have broken slowport that requires
 * tweaking of addresses in the MTD driver.
 */
static inline unsigned ixp2000_has_broken_slowport(void)
{
      unsigned long id = *IXP2000_PRODUCT_ID;
      unsigned long id_prod = id & (IXP2000_MAJ_PROD_TYPE_MASK |
                              IXP2000_MIN_PROD_TYPE_MASK);
      return (((id_prod ==
              /* fixed in IXP2400-B0 */
              (IXP2000_MAJ_PROD_TYPE_IXP2000 |
               IXP2000_MIN_PROD_TYPE_IXP2400)) &&
             ((id & IXP2000_MAJ_REV_MASK) == 0)) ||
            ((id_prod ==
              /* fixed in IXP2800-B0 */
              (IXP2000_MAJ_PROD_TYPE_IXP2000 |
               IXP2000_MIN_PROD_TYPE_IXP2800)) &&
             ((id & IXP2000_MAJ_REV_MASK) == 0)) ||
            ((id_prod ==
              /* fixed in IXP2850-B0 */
              (IXP2000_MAJ_PROD_TYPE_IXP2000 |
               IXP2000_MIN_PROD_TYPE_IXP2850)) &&
             ((id & IXP2000_MAJ_REV_MASK) == 0)));
}

static inline unsigned int ixp2000_has_flash(void)
{
      return ((*IXP2000_STRAP_OPTIONS) & (CFG_BOOT_PROM));
}

static inline unsigned int ixp2000_is_pcimaster(void)
{
      return ((*IXP2000_STRAP_OPTIONS) & (CFG_PCI_BOOT_HOST));
}

void ixp2000_map_io(void);
void ixp2000_uart_init(void);
void ixp2000_init_irq(void);
void ixp2000_init_time(unsigned long);
unsigned long ixp2000_gettimeoffset(void);

struct pci_sys_data;

u32 *ixp2000_pci_config_addr(unsigned int bus, unsigned int devfn, int where);
void ixp2000_pci_preinit(void);
int ixp2000_pci_setup(int, struct pci_sys_data*);
struct pci_bus* ixp2000_pci_scan_bus(int, struct pci_sys_data*);
int ixp2000_pci_read_config(struct pci_bus*, unsigned int, int, int, u32 *);
int ixp2000_pci_write_config(struct pci_bus*, unsigned int, int, int, u32);

/*
 * Several of the IXP2000 systems have banked flash so we need to extend the
 * flash_platform_data structure with some private pointers
 */
struct ixp2000_flash_data {
      struct flash_platform_data *platform_data;
      int nr_banks;
      unsigned long (*bank_setup)(unsigned long);
};

struct ixp2000_i2c_pins {
      unsigned long sda_pin;
      unsigned long scl_pin;
};


#endif /*  !__ASSEMBLY__ */

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