include/asm-arm/arch-ixp4xx/platform.h

   1 /*
   2  * include/asm-arm/arch-ixp4xx/platform.h
   3  *
   4  * Constants and functions that are useful to IXP4xx platform-specific code
   5  * and device drivers.
   6  *
   7  * Copyright (C) 2004 MontaVista Software, Inc.
   8  */
   9
  10 #ifndef __ASM_ARCH_HARDWARE_H__
  11 #error "Do not include this directly, instead #include <asm/hardware.h>"
  12 #endif
  13
  14 #ifndef __ASSEMBLY__
  15
  16 #include <asm/types.h>
  17
  18 #ifndef __ARMEB__
  19 #define REG_OFFSET      0
  20 #else
  21 #define REG_OFFSET      3
  22 #endif
  23
  24 /*
  25  * Expansion bus memory regions
  26  */
  27 #define IXP4XX_EXP_BUS_BASE_PHYS        (0x50000000)
  28
  29 /*
  30  * The expansion bus on the IXP4xx can be configured for either 16 or
  31  * 32MB windows and the CS offset for each region changes based on the
  32  * current configuration. This means that we cannot simply hardcode
  33  * each offset. ixp4xx_sys_init() looks at the expansion bus configuration
  34  * as setup by the bootloader to determine our window size.
  35  */
  36 extern unsigned long ixp4xx_exp_bus_size;
  37
  38 #define IXP4XX_EXP_BUS_BASE(region)\
  39                 (IXP4XX_EXP_BUS_BASE_PHYS + ((region) * ixp4xx_exp_bus_size))
  40
  41 #define IXP4XX_FLASH_WRITABLE   (0x2)
  42 #define IXP4XX_FLASH_DEFAULT    (0xbcd23c40)
  43 #define IXP4XX_FLASH_WRITE      (0xbcd23c42)
  44
  45 /*
  46  * Clock Speed Definitions.
  47  */
  48 #define IXP4XX_PERIPHERAL_BUS_CLOCK     (66) /* 66Mhzi APB BUS   */
  49 #define IXP4XX_UART_XTAL                14745600
  50
  51 /*
  52  * The IXP4xx chips do not have an I2C unit, so GPIO lines are just
  53  * used to
  54  * Used as platform_data to provide GPIO pin information to the ixp42x
  55  * I2C driver.
  56  */
  57 struct ixp4xx_i2c_pins {
  58         unsigned long sda_pin;
  59         unsigned long scl_pin;
  60 };
  61
  62
  63 struct sys_timer;
  64
  65 /*
  66  * Functions used by platform-level setup code
  67  */
  68 extern void ixp4xx_map_io(void);
  69 extern void ixp4xx_init_irq(void);
  70 extern void ixp4xx_sys_init(void);
  71 extern struct sys_timer ixp4xx_timer;
  72 extern void ixp4xx_pci_preinit(void);
  73 struct pci_sys_data;
  74 extern int ixp4xx_setup(int nr, struct pci_sys_data *sys);
  75 extern struct pci_bus *ixp4xx_scan_bus(int nr, struct pci_sys_data *sys);
  76
  77 /*
  78  * GPIO-functions
  79  */
  80 /*
  81  * The following converted to the real HW bits the gpio_line_config
  82  */
  83 /* GPIO pin types */
  84 #define IXP4XX_GPIO_OUT                 0x1
  85 #define IXP4XX_GPIO_IN                  0x2
  86
  87 /* GPIO signal types */
  88 #define IXP4XX_GPIO_LOW                 0
  89 #define IXP4XX_GPIO_HIGH                1
  90
  91 /* GPIO Clocks */
  92 #define IXP4XX_GPIO_CLK_0               14
  93 #define IXP4XX_GPIO_CLK_1               15
  94
  95 static inline void gpio_line_config(u8 line, u32 direction)
  96 {
  97         if (direction == IXP4XX_GPIO_IN)
  98                 *IXP4XX_GPIO_GPOER |= (1 << line);
  99         else
 100                 *IXP4XX_GPIO_GPOER &= ~(1 << line);
 101 }
 102
 103 static inline void gpio_line_get(u8 line, int *value)
 104 {
 105         *value = (*IXP4XX_GPIO_GPINR >> line) & 0x1;
 106 }
 107
 108 static inline void gpio_line_set(u8 line, int value)
 109 {
 110         if (value == IXP4XX_GPIO_HIGH)
 111             *IXP4XX_GPIO_GPOUTR |= (1 << line);
 112         else if (value == IXP4XX_GPIO_LOW)
 113             *IXP4XX_GPIO_GPOUTR &= ~(1 << line);
 114 }
 115
 116 #endif // __ASSEMBLY__
 117