forked from Minki/linux
9d92a7e1b0
This patch adds a driver for subchannels of type chsc. A device /dev/chsc is created which may be used to issue ioctls to: - obtain information about the machine's I/O configuration - dynamically change the machine's I/O configuration via asynchronous chsc commands Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
142 lines
2.7 KiB
C
142 lines
2.7 KiB
C
#ifndef S390_CIO_IOASM_H
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#define S390_CIO_IOASM_H
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#include <asm/chpid.h>
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#include <asm/schid.h>
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/*
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* TPI info structure
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*/
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struct tpi_info {
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struct subchannel_id schid;
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__u32 intparm; /* interruption parameter */
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__u32 adapter_IO : 1;
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__u32 reserved2 : 1;
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__u32 isc : 3;
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__u32 reserved3 : 12;
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__u32 int_type : 3;
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__u32 reserved4 : 12;
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} __attribute__ ((packed));
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/*
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* Some S390 specific IO instructions as inline
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*/
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static inline int stsch(struct subchannel_id schid,
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volatile struct schib *addr)
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{
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register struct subchannel_id reg1 asm ("1") = schid;
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int ccode;
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asm volatile(
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" stsch 0(%2)\n"
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" ipm %0\n"
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" srl %0,28"
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: "=d" (ccode) : "d" (reg1), "a" (addr), "m" (*addr) : "cc");
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return ccode;
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}
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static inline int stsch_err(struct subchannel_id schid,
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volatile struct schib *addr)
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{
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register struct subchannel_id reg1 asm ("1") = schid;
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int ccode = -EIO;
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asm volatile(
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" stsch 0(%2)\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "+d" (ccode) : "d" (reg1), "a" (addr), "m" (*addr) : "cc");
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return ccode;
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}
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static inline int msch(struct subchannel_id schid,
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volatile struct schib *addr)
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{
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register struct subchannel_id reg1 asm ("1") = schid;
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int ccode;
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asm volatile(
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" msch 0(%2)\n"
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" ipm %0\n"
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" srl %0,28"
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: "=d" (ccode) : "d" (reg1), "a" (addr), "m" (*addr) : "cc");
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return ccode;
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}
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static inline int msch_err(struct subchannel_id schid,
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volatile struct schib *addr)
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{
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register struct subchannel_id reg1 asm ("1") = schid;
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int ccode = -EIO;
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asm volatile(
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" msch 0(%2)\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "+d" (ccode) : "d" (reg1), "a" (addr), "m" (*addr) : "cc");
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return ccode;
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}
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static inline int tsch(struct subchannel_id schid,
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volatile struct irb *addr)
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{
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register struct subchannel_id reg1 asm ("1") = schid;
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int ccode;
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asm volatile(
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" tsch 0(%2)\n"
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" ipm %0\n"
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" srl %0,28"
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: "=d" (ccode) : "d" (reg1), "a" (addr), "m" (*addr) : "cc");
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return ccode;
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}
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static inline int tpi( volatile struct tpi_info *addr)
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{
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int ccode;
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asm volatile(
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" tpi 0(%1)\n"
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" ipm %0\n"
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" srl %0,28"
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: "=d" (ccode) : "a" (addr), "m" (*addr) : "cc");
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return ccode;
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}
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static inline int chsc(void *chsc_area)
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{
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typedef struct { char _[4096]; } addr_type;
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int cc;
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asm volatile(
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" .insn rre,0xb25f0000,%2,0\n"
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" ipm %0\n"
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" srl %0,28\n"
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: "=d" (cc), "=m" (*(addr_type *) chsc_area)
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: "d" (chsc_area), "m" (*(addr_type *) chsc_area)
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: "cc");
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return cc;
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}
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static inline int rchp(struct chp_id chpid)
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{
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register struct chp_id reg1 asm ("1") = chpid;
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int ccode;
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asm volatile(
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" lr 1,%1\n"
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" rchp\n"
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" ipm %0\n"
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" srl %0,28"
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: "=d" (ccode) : "d" (reg1) : "cc");
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return ccode;
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}
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#endif
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