1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * I/O Processor (IOP) defines and structures, mostly snagged from A/UX 4 * header files. 5 * 6 * The original header from which this was taken is copyrighted. I've done some 7 * rewriting (in fact my changes make this a bit more readable, IMHO) but some 8 * more should be done. 9 */ 10 11 /* 12 * This is the base address of the IOPs. Use this as the address of 13 * a "struct iop" (see below) to see where the actual registers fall. 14 */ 15 16 #define SCC_IOP_BASE_IIFX (0x50F04000) 17 #define ISM_IOP_BASE_IIFX (0x50F12000) 18 19 #define SCC_IOP_BASE_QUADRA (0x50F0C000) 20 #define ISM_IOP_BASE_QUADRA (0x50F1E000) 21 22 /* IOP status/control register bits: */ 23 24 #define IOP_BYPASS 0x01 /* bypass-mode hardware access */ 25 #define IOP_AUTOINC 0x02 /* allow autoincrement of ramhi/lo */ 26 #define IOP_RUN 0x04 /* set to 0 to reset IOP chip */ 27 #define IOP_IRQ 0x08 /* generate IRQ to IOP if 1 */ 28 #define IOP_INT0 0x10 /* intr priority from IOP to host */ 29 #define IOP_INT1 0x20 /* intr priority from IOP to host */ 30 #define IOP_HWINT 0x40 /* IRQ from hardware; bypass mode only */ 31 #define IOP_DMAINACTIVE 0x80 /* no DMA request active; bypass mode only */ 32 33 #define NUM_IOPS 2 34 #define NUM_IOP_CHAN 7 35 #define NUM_IOP_MSGS NUM_IOP_CHAN*8 36 #define IOP_MSG_LEN 32 37 38 /* IOP reference numbers, used by the globally-visible iop_xxx functions */ 39 40 #define IOP_NUM_SCC 0 41 #define IOP_NUM_ISM 1 42 43 /* IOP channel states */ 44 45 #define IOP_MSG_IDLE 0 /* idle */ 46 #define IOP_MSG_NEW 1 /* new message sent */ 47 #define IOP_MSG_RCVD 2 /* message received; processing */ 48 #define IOP_MSG_COMPLETE 3 /* message processing complete */ 49 50 /* IOP message status codes */ 51 52 #define IOP_MSGSTATUS_UNUSED 0 /* Unused message structure */ 53 #define IOP_MSGSTATUS_WAITING 1 /* waiting for channel */ 54 #define IOP_MSGSTATUS_SENT 2 /* message sent, awaiting reply */ 55 #define IOP_MSGSTATUS_COMPLETE 3 /* message complete and reply rcvd */ 56 #define IOP_MSGSTATUS_UNSOL 6 /* message is unsolicited */ 57 58 /* IOP memory addresses of the members of the mac_iop_kernel structure. */ 59 60 #define IOP_ADDR_MAX_SEND_CHAN 0x0200 61 #define IOP_ADDR_SEND_STATE 0x0201 62 #define IOP_ADDR_PATCH_CTRL 0x021F 63 #define IOP_ADDR_SEND_MSG 0x0220 64 #define IOP_ADDR_MAX_RECV_CHAN 0x0300 65 #define IOP_ADDR_RECV_STATE 0x0301 66 #define IOP_ADDR_ALIVE 0x031F 67 #define IOP_ADDR_RECV_MSG 0x0320 68 69 #ifndef __ASSEMBLY__ 70 71 /* 72 * IOP Control registers, staggered because in usual Apple style they were 73 * too lazy to decode the A0 bit. This structure is assumed to begin at 74 * one of the xxx_IOP_BASE addresses given above. 75 */ 76 77 struct mac_iop { 78 __u8 ram_addr_hi; /* shared RAM address hi byte */ 79 __u8 pad0; 80 __u8 ram_addr_lo; /* shared RAM address lo byte */ 81 __u8 pad1; 82 __u8 status_ctrl; /* status/control register */ 83 __u8 pad2[3]; 84 __u8 ram_data; /* RAM data byte at ramhi/lo */ 85 86 __u8 pad3[23]; 87 88 /* Bypass-mode hardware access registers */ 89 90 union { 91 struct { /* SCC registers */ 92 __u8 sccb_cmd; /* SCC B command reg */ 93 __u8 pad4; 94 __u8 scca_cmd; /* SCC A command reg */ 95 __u8 pad5; 96 __u8 sccb_data; /* SCC B data */ 97 __u8 pad6; 98 __u8 scca_data; /* SCC A data */ 99 } scc_regs; 100 101 struct { /* ISM registers */ 102 __u8 wdata; /* write a data byte */ 103 __u8 pad7; 104 __u8 wmark; /* write a mark byte */ 105 __u8 pad8; 106 __u8 wcrc; /* write 2-byte crc to disk */ 107 __u8 pad9; 108 __u8 wparams; /* write the param regs */ 109 __u8 pad10; 110 __u8 wphase; /* write the phase states & dirs */ 111 __u8 pad11; 112 __u8 wsetup; /* write the setup register */ 113 __u8 pad12; 114 __u8 wzeroes; /* mode reg: 1's clr bits, 0's are x */ 115 __u8 pad13; 116 __u8 wones; /* mode reg: 1's set bits, 0's are x */ 117 __u8 pad14; 118 __u8 rdata; /* read a data byte */ 119 __u8 pad15; 120 __u8 rmark; /* read a mark byte */ 121 __u8 pad16; 122 __u8 rerror; /* read the error register */ 123 __u8 pad17; 124 __u8 rparams; /* read the param regs */ 125 __u8 pad18; 126 __u8 rphase; /* read the phase states & dirs */ 127 __u8 pad19; 128 __u8 rsetup; /* read the setup register */ 129 __u8 pad20; 130 __u8 rmode; /* read the mode register */ 131 __u8 pad21; 132 __u8 rhandshake; /* read the handshake register */ 133 } ism_regs; 134 } b; 135 }; 136 137 /* This structure is used to track IOP messages in the Linux kernel */ 138 139 struct iop_msg { 140 struct iop_msg *next; /* next message in queue or NULL */ 141 uint iop_num; /* IOP number */ 142 uint channel; /* channel number */ 143 void *caller_priv; /* caller private data */ 144 int status; /* status of this message */ 145 __u8 message[IOP_MSG_LEN]; /* the message being sent/received */ 146 __u8 reply[IOP_MSG_LEN]; /* the reply to the message */ 147 void (*handler)(struct iop_msg *); 148 /* function to call when reply recvd */ 149 }; 150 151 extern int iop_scc_present,iop_ism_present; 152 153 extern int iop_listen(uint, uint, 154 void (*handler)(struct iop_msg *), 155 const char *); 156 extern int iop_send_message(uint, uint, void *, uint, __u8 *, 157 void (*)(struct iop_msg *)); 158 extern void iop_complete_message(struct iop_msg *); 159 extern void iop_upload_code(uint, __u8 *, uint, __u16); 160 extern void iop_download_code(uint, __u8 *, uint, __u16); 161 extern __u8 *iop_compare_code(uint, __u8 *, uint, __u16); 162 extern void iop_ism_irq_poll(uint); 163 164 extern void iop_register_interrupts(void); 165 166 #endif /* __ASSEMBLY__ */ 167