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 18static inline unsigned long ixp2000_reg_read(volatile void *reg) 19{ 20 return *((volatile unsigned long *)reg); 21} 22 23static inline void ixp2000_reg_write(volatile void *reg, unsigned long val) 24{ 25 *((volatile unsigned long *)reg) = val; 26} 27 28/* 29 * On the IXP2400, we can't use XCB=000 due to chip bugs. We use 30 * XCB=101 instead, but that makes all I/O accesses bufferable. This 31 * is not a problem in general, but we do have to be slightly more 32 * careful because I/O writes are no longer automatically flushed out 33 * of the write buffer. 34 * 35 * In cases where we want to make sure that a write has been flushed 36 * out of the write buffer before we proceed, for example when masking 37 * a device interrupt before re-enabling IRQs in CPSR, we can use this 38 * function, ixp2000_reg_wrb, which performs a write, a readback, and 39 * issues a dummy instruction dependent on the value of the readback 40 * (mov rX, rX) to make sure that the readback has completed before we 41 * continue. 42 */ 43static inline void ixp2000_reg_wrb(volatile void *reg, unsigned long val) 44{ 45 unsigned long dummy; 46 47 *((volatile unsigned long *)reg) = val; 48 49 dummy = *((volatile unsigned long *)reg); 50 __asm__ __volatile__("mov %0, %0" : "+r" (dummy)); 51} 52 53/* 54 * Boards may multiplex different devices on the 2nd channel of 55 * the slowport interface that each need different configuration 56 * settings. For example, the IXDP2400 uses channel 2 on the interface 57 * to access the CPLD, the switch fabric card, and the media card. Each 58 * one needs a different mode so drivers must save/restore the mode 59 * before and after each operation. 60 * 61 * acquire_slowport(&your_config); 62 * ... 63 * do slowport operations 64 * ... 65 * release_slowport(); 66 * 67 * Note that while you have the slowport, you are holding a spinlock, 68 * so your code should be written as if you explicitly acquired a lock. 69 * 70 * The configuration only affects device 2 on the slowport, so the 71 * MTD map driver does not acquire/release the slowport. 72 */ 73struct slowport_cfg { 74 unsigned long CCR; /* Clock divide */ 75 unsigned long WTC; /* Write Timing Control */ 76 unsigned long RTC; /* Read Timing Control */ 77 unsigned long PCR; /* Protocol Control Register */ 78 unsigned long ADC; /* Address/Data Width Control */ 79}; 80 81 82void ixp2000_acquire_slowport(struct slowport_cfg *, struct slowport_cfg *); 83void ixp2000_release_slowport(struct slowport_cfg *); 84 85/* 86 * IXP2400 A0/A1 and IXP2800 A0/A1/A2 have broken slowport that requires 87 * tweaking of addresses in the MTD driver. 88 */ 89static inline unsigned ixp2000_has_broken_slowport(void) 90{ 91 unsigned long id = *IXP2000_PRODUCT_ID; 92 unsigned long id_prod = id & (IXP2000_MAJ_PROD_TYPE_MASK | 93 IXP2000_MIN_PROD_TYPE_MASK); 94 return (((id_prod == 95 /* fixed in IXP2400-B0 */ 96 (IXP2000_MAJ_PROD_TYPE_IXP2000 | 97 IXP2000_MIN_PROD_TYPE_IXP2400)) && 98 ((id & IXP2000_MAJ_REV_MASK) == 0)) || 99 ((id_prod == 100 /* fixed in IXP2800-B0 */ 101 (IXP2000_MAJ_PROD_TYPE_IXP2000 | 102 IXP2000_MIN_PROD_TYPE_IXP2800)) && 103 ((id & IXP2000_MAJ_REV_MASK) == 0)) || 104 ((id_prod == 105 /* fixed in IXP2850-B0 */ 106 (IXP2000_MAJ_PROD_TYPE_IXP2000 | 107 IXP2000_MIN_PROD_TYPE_IXP2850)) && 108 ((id & IXP2000_MAJ_REV_MASK) == 0))); 109} 110 111static inline unsigned int ixp2000_has_flash(void) 112{ 113 return ((*IXP2000_STRAP_OPTIONS) & (CFG_BOOT_PROM)); 114} 115 116static inline unsigned int ixp2000_is_pcimaster(void) 117{ 118 return ((*IXP2000_STRAP_OPTIONS) & (CFG_PCI_BOOT_HOST)); 119} 120 121void ixp2000_map_io(void); 122void ixp2000_uart_init(void); 123void ixp2000_init_irq(void); 124void ixp2000_init_time(unsigned long); 125unsigned long ixp2000_gettimeoffset(void); 126 127struct pci_sys_data; 128 129u32 *ixp2000_pci_config_addr(unsigned int bus, unsigned int devfn, int where); 130void ixp2000_pci_preinit(void); 131int ixp2000_pci_setup(int, struct pci_sys_data*); 132struct pci_bus* ixp2000_pci_scan_bus(int, struct pci_sys_data*); 133int ixp2000_pci_read_config(struct pci_bus*, unsigned int, int, int, u32 *); 134int ixp2000_pci_write_config(struct pci_bus*, unsigned int, int, int, u32); 135 136/* 137 * Several of the IXP2000 systems have banked flash so we need to extend the 138 * flash_platform_data structure with some private pointers 139 */ 140struct ixp2000_flash_data { 141 struct flash_platform_data *platform_data; 142 int nr_banks; 143 unsigned long (*bank_setup)(unsigned long); 144}; 145 146struct ixp2000_i2c_pins { 147 unsigned long sda_pin; 148 unsigned long scl_pin; 149}; 150 151 152#endif /* !__ASSEMBLY__ */ 153