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// SPDX-License-Identifier: GPL-2.0
/*
* s390 specific pci instructions
*
* Copyright IBM Corp. 2013
*/
#include <linux/export.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/jump_label.h>
#include <asm/facility.h>
#include <asm/pci_insn.h>
#include <asm/pci_debug.h>
#include <asm/pci_io.h>
#include <asm/processor.h>
#define ZPCI_INSN_BUSY_DELAY 1 /* 1 microsecond */
static inline void zpci_err_insn(u8 cc, u8 status, u64 req, u64 offset)
{
struct {
u64 req;
u64 offset;
u8 cc;
u8 status;
} __packed data = {req, offset, cc, status};
zpci_err_hex(&data, sizeof(data));
}
/* Modify PCI Function Controls */
static inline u8 __mpcifc(u64 req, struct zpci_fib *fib, u8 *status)
{
u8 cc;
asm volatile (
" .insn rxy,0xe300000000d0,%[req],%[fib]\n"
" ipm %[cc]\n"
" srl %[cc],28\n"
: [cc] "=d" (cc), [req] "+d" (req), [fib] "+Q" (*fib)
: : "cc");
*status = req >> 24 & 0xff;
return cc;
}
u8 zpci_mod_fc(u64 req, struct zpci_fib *fib, u8 *status)
{
u8 cc;
do {
cc = __mpcifc(req, fib, status);
if (cc == 2)
msleep(ZPCI_INSN_BUSY_DELAY);
} while (cc == 2);
if (cc)
zpci_err_insn(cc, *status, req, 0);
return cc;
}
/* Refresh PCI Translations */
static inline u8 __rpcit(u64 fn, u64 addr, u64 range, u8 *status)
{
union register_pair addr_range = {.even = addr, .odd = range};
u8 cc;
asm volatile (
" .insn rre,0xb9d30000,%[fn],%[addr_range]\n"
" ipm %[cc]\n"
" srl %[cc],28\n"
: [cc] "=d" (cc), [fn] "+d" (fn)
: [addr_range] "d" (addr_range.pair)
: "cc");
*status = fn >> 24 & 0xff;
return cc;
}
int zpci_refresh_trans(u64 fn, u64 addr, u64 range)
{
u8 cc, status;
do {
cc = __rpcit(fn, addr, range, &status);
if (cc == 2)
udelay(ZPCI_INSN_BUSY_DELAY);
} while (cc == 2);
if (cc)
zpci_err_insn(cc, status, addr, range);
if (cc == 1 && (status == 4 || status == 16))
return -ENOMEM;
return (cc) ? -EIO : 0;
}
/* Set Interruption Controls */
int __zpci_set_irq_ctrl(u16 ctl, u8 isc, union zpci_sic_iib *iib)
{
if (!test_facility(72))
return -EIO;
asm volatile(
".insn rsy,0xeb00000000d1,%[ctl],%[isc],%[iib]\n"
: : [ctl] "d" (ctl), [isc] "d" (isc << 27), [iib] "Q" (*iib));
return 0;
}
/* PCI Load */
static inline int ____pcilg(u64 *data, u64 req, u64 offset, u8 *status)
{
union register_pair req_off = {.even = req, .odd = offset};
int cc = -ENXIO;
u64 __data;
asm volatile (
" .insn rre,0xb9d20000,%[data],%[req_off]\n"
"0: ipm %[cc]\n"
" srl %[cc],28\n"
"1:\n"
EX_TABLE(0b, 1b)
: [cc] "+d" (cc), [data] "=d" (__data),
[req_off] "+&d" (req_off.pair) :: "cc");
*status = req_off.even >> 24 & 0xff;
*data = __data;
return cc;
}
static inline int __pcilg(u64 *data, u64 req, u64 offset, u8 *status)
{
u64 __data;
int cc;
cc = ____pcilg(&__data, req, offset, status);
if (!cc)
*data = __data;
return cc;
}
int __zpci_load(u64 *data, u64 req, u64 offset)
{
u8 status;
int cc;
do {
cc = __pcilg(data, req, offset, &status);
if (cc == 2)
udelay(ZPCI_INSN_BUSY_DELAY);
} while (cc == 2);
if (cc)
zpci_err_insn(cc, status, req, offset);
return (cc > 0) ? -EIO : cc;
}
EXPORT_SYMBOL_GPL(__zpci_load);
static inline int zpci_load_fh(u64 *data, const volatile void __iomem *addr,
unsigned long len)
{
struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)];
u64 req = ZPCI_CREATE_REQ(READ_ONCE(entry->fh), entry->bar, len);
return __zpci_load(data, req, ZPCI_OFFSET(addr));
}
static inline int __pcilg_mio(u64 *data, u64 ioaddr, u64 len, u8 *status)
{
union register_pair ioaddr_len = {.even = ioaddr, .odd = len};
int cc = -ENXIO;
u64 __data;
asm volatile (
" .insn rre,0xb9d60000,%[data],%[ioaddr_len]\n"
"0: ipm %[cc]\n"
" srl %[cc],28\n"
"1:\n"
EX_TABLE(0b, 1b)
: [cc] "+d" (cc), [data] "=d" (__data),
[ioaddr_len] "+&d" (ioaddr_len.pair) :: "cc");
*status = ioaddr_len.odd >> 24 & 0xff;
*data = __data;
return cc;
}
int zpci_load(u64 *data, const volatile void __iomem *addr, unsigned long len)
{
u8 status;
int cc;
if (!static_branch_unlikely(&have_mio))
return zpci_load_fh(data, addr, len);
cc = __pcilg_mio(data, (__force u64) addr, len, &status);
if (cc)
zpci_err_insn(cc, status, 0, (__force u64) addr);
return (cc > 0) ? -EIO : cc;
}
EXPORT_SYMBOL_GPL(zpci_load);
/* PCI Store */
static inline int __pcistg(u64 data, u64 req, u64 offset, u8 *status)
{
union register_pair req_off = {.even = req, .odd = offset};
int cc = -ENXIO;
asm volatile (
" .insn rre,0xb9d00000,%[data],%[req_off]\n"
"0: ipm %[cc]\n"
" srl %[cc],28\n"
"1:\n"
EX_TABLE(0b, 1b)
: [cc] "+d" (cc), [req_off] "+&d" (req_off.pair)
: [data] "d" (data)
: "cc");
*status = req_off.even >> 24 & 0xff;
return cc;
}
int __zpci_store(u64 data, u64 req, u64 offset)
{
u8 status;
int cc;
do {
cc = __pcistg(data, req, offset, &status);
if (cc == 2)
udelay(ZPCI_INSN_BUSY_DELAY);
} while (cc == 2);
if (cc)
zpci_err_insn(cc, status, req, offset);
return (cc > 0) ? -EIO : cc;
}
EXPORT_SYMBOL_GPL(__zpci_store);
static inline int zpci_store_fh(const volatile void __iomem *addr, u64 data,
unsigned long len)
{
struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)];
u64 req = ZPCI_CREATE_REQ(READ_ONCE(entry->fh), entry->bar, len);
return __zpci_store(data, req, ZPCI_OFFSET(addr));
}
static inline int __pcistg_mio(u64 data, u64 ioaddr, u64 len, u8 *status)
{
union register_pair ioaddr_len = {.even = ioaddr, .odd = len};
int cc = -ENXIO;
asm volatile (
" .insn rre,0xb9d40000,%[data],%[ioaddr_len]\n"
"0: ipm %[cc]\n"
" srl %[cc],28\n"
"1:\n"
EX_TABLE(0b, 1b)
: [cc] "+d" (cc), [ioaddr_len] "+&d" (ioaddr_len.pair)
: [data] "d" (data)
: "cc", "memory");
*status = ioaddr_len.odd >> 24 & 0xff;
return cc;
}
int zpci_store(const volatile void __iomem *addr, u64 data, unsigned long len)
{
u8 status;
int cc;
if (!static_branch_unlikely(&have_mio))
return zpci_store_fh(addr, data, len);
cc = __pcistg_mio(data, (__force u64) addr, len, &status);
if (cc)
zpci_err_insn(cc, status, 0, (__force u64) addr);
return (cc > 0) ? -EIO : cc;
}
EXPORT_SYMBOL_GPL(zpci_store);
/* PCI Store Block */
static inline int __pcistb(const u64 *data, u64 req, u64 offset, u8 *status)
{
int cc = -ENXIO;
asm volatile (
" .insn rsy,0xeb00000000d0,%[req],%[offset],%[data]\n"
"0: ipm %[cc]\n"
" srl %[cc],28\n"
"1:\n"
EX_TABLE(0b, 1b)
: [cc] "+d" (cc), [req] "+d" (req)
: [offset] "d" (offset), [data] "Q" (*data)
: "cc");
*status = req >> 24 & 0xff;
return cc;
}
int __zpci_store_block(const u64 *data, u64 req, u64 offset)
{
u8 status;
int cc;
do {
cc = __pcistb(data, req, offset, &status);
if (cc == 2)
udelay(ZPCI_INSN_BUSY_DELAY);
} while (cc == 2);
if (cc)
zpci_err_insn(cc, status, req, offset);
return (cc > 0) ? -EIO : cc;
}
EXPORT_SYMBOL_GPL(__zpci_store_block);
static inline int zpci_write_block_fh(volatile void __iomem *dst,
const void *src, unsigned long len)
{
struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(dst)];
u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, len);
u64 offset = ZPCI_OFFSET(dst);
return __zpci_store_block(src, req, offset);
}
static inline int __pcistb_mio(const u64 *data, u64 ioaddr, u64 len, u8 *status)
{
int cc = -ENXIO;
asm volatile (
" .insn rsy,0xeb00000000d4,%[len],%[ioaddr],%[data]\n"
"0: ipm %[cc]\n"
" srl %[cc],28\n"
"1:\n"
EX_TABLE(0b, 1b)
: [cc] "+d" (cc), [len] "+d" (len)
: [ioaddr] "d" (ioaddr), [data] "Q" (*data)
: "cc");
*status = len >> 24 & 0xff;
return cc;
}
int zpci_write_block(volatile void __iomem *dst,
const void *src, unsigned long len)
{
u8 status;
int cc;
if (!static_branch_unlikely(&have_mio))
return zpci_write_block_fh(dst, src, len);
cc = __pcistb_mio(src, (__force u64) dst, len, &status);
if (cc)
zpci_err_insn(cc, status, 0, (__force u64) dst);
return (cc > 0) ? -EIO : cc;
}
EXPORT_SYMBOL_GPL(zpci_write_block);
static inline void __pciwb_mio(void)
{
unsigned long unused = 0;
asm volatile (".insn rre,0xb9d50000,%[op],%[op]\n"
: [op] "+d" (unused));
}
void zpci_barrier(void)
{
if (static_branch_likely(&have_mio))
__pciwb_mio();
}
EXPORT_SYMBOL_GPL(zpci_barrier);
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