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_EXP_BUS_END(region)\
  42                 (IXP4XX_EXP_BUS_BASE(region) + ixp4xx_exp_bus_size - 1)
  43
  44 /* Those macros can be used to adjust timing and configure
  45  * other features for each region.
  46  */
  47
  48 #define IXP4XX_EXP_BUS_RECOVERY_T(x)    (((x) & 0x0f) << 16)
  49 #define IXP4XX_EXP_BUS_HOLD_T(x)        (((x) & 0x03) << 20)
  50 #define IXP4XX_EXP_BUS_STROBE_T(x)      (((x) & 0x0f) << 22)
  51 #define IXP4XX_EXP_BUS_SETUP_T(x)       (((x) & 0x03) << 26)
  52 #define IXP4XX_EXP_BUS_ADDR_T(x)        (((x) & 0x03) << 28)
  53 #define IXP4XX_EXP_BUS_SIZE(x)          (((x) & 0x0f) << 10)
  54 #define IXP4XX_EXP_BUS_CYCLES(x)        (((x) & 0x03) << 14)
  55
  56 #define IXP4XX_EXP_BUS_CS_EN            (1L << 31)
  57 #define IXP4XX_EXP_BUS_BYTE_RD16        (1L << 6)
  58 #define IXP4XX_EXP_BUS_HRDY_POL         (1L << 5)
  59 #define IXP4XX_EXP_BUS_MUX_EN           (1L << 4)
  60 #define IXP4XX_EXP_BUS_SPLT_EN          (1L << 3)
  61 #define IXP4XX_EXP_BUS_WR_EN            (1L << 1)
  62 #define IXP4XX_EXP_BUS_BYTE_EN          (1L << 0)
  63
  64 #define IXP4XX_EXP_BUS_CYCLES_INTEL     0x00
  65 #define IXP4XX_EXP_BUS_CYCLES_MOTOROLA  0x01
  66 #define IXP4XX_EXP_BUS_CYCLES_HPI       0x02
  67
  68 #define IXP4XX_FLASH_WRITABLE   (0x2)
  69 #define IXP4XX_FLASH_DEFAULT    (0xbcd23c40)
  70 #define IXP4XX_FLASH_WRITE      (0xbcd23c42)
  71
  72 /*
  73  * Clock Speed Definitions.
  74  */
  75 #define IXP4XX_PERIPHERAL_BUS_CLOCK     (66) /* 66Mhzi APB BUS   */
  76 #define IXP4XX_UART_XTAL                14745600
  77
  78 /*
  79  * The IXP4xx chips do not have an I2C unit, so GPIO lines are just
  80  * used to
  81  * Used as platform_data to provide GPIO pin information to the ixp42x
  82  * I2C driver.
  83  */
  84 struct ixp4xx_i2c_pins {
  85         unsigned long sda_pin;
  86         unsigned long scl_pin;
  87 };
  88
  89
  90 struct sys_timer;
  91
  92 /*
  93  * Frequency of clock used for primary clocksource
  94  */
  95 extern unsigned long ixp4xx_timer_freq;
  96
  97 /*
  98  * Functions used by platform-level setup code
  99  */
 100 extern void ixp4xx_map_io(void);
 101 extern void ixp4xx_init_irq(void);
 102 extern void ixp4xx_sys_init(void);
 103 extern struct sys_timer ixp4xx_timer;
 104 extern void ixp4xx_pci_preinit(void);
 105 struct pci_sys_data;
 106 extern int ixp4xx_setup(int nr, struct pci_sys_data *sys);
 107 extern struct pci_bus *ixp4xx_scan_bus(int nr, struct pci_sys_data *sys);
 108
 109 /*
 110  * GPIO-functions
 111  */
 112 /*
 113  * The following converted to the real HW bits the gpio_line_config
 114  */
 115 /* GPIO pin types */
 116 #define IXP4XX_GPIO_OUT                 0x1
 117 #define IXP4XX_GPIO_IN                  0x2
 118
 119 /* GPIO signal types */
 120 #define IXP4XX_GPIO_LOW                 0
 121 #define IXP4XX_GPIO_HIGH                1
 122
 123 /* GPIO Clocks */
 124 #define IXP4XX_GPIO_CLK_0               14
 125 #define IXP4XX_GPIO_CLK_1               15
 126
 127 static inline void gpio_line_config(u8 line, u32 direction)
 128 {
 129         if (direction == IXP4XX_GPIO_IN)
 130                 *IXP4XX_GPIO_GPOER |= (1 << line);
 131         else
 132                 *IXP4XX_GPIO_GPOER &= ~(1 << line);
 133 }
 134
 135 static inline void gpio_line_isr_clear(u8 line)
 136 {
 137         *IXP4XX_GPIO_GPISR = (1 << line);
 138 }
 139
 140 static inline void gpio_line_get(u8 line, int *value)
 141 {
 142         *value = (*IXP4XX_GPIO_GPINR >> line) & 0x1;
 143 }
 144
 145 static inline void gpio_line_set(u8 line, int value)
 146 {
 147         if (value == IXP4XX_GPIO_HIGH)
 148             *IXP4XX_GPIO_GPOUTR |= (1 << line);
 149         else if (value == IXP4XX_GPIO_LOW)
 150             *IXP4XX_GPIO_GPOUTR &= ~(1 << line);
 151 }
 152
 153 #endif // __ASSEMBLY__
 154