forked from Minki/linux
281 lines
9.1 KiB
C
281 lines
9.1 KiB
C
/****************************************************************************
|
|
* Driver for Solarflare Solarstorm network controllers and boards
|
|
* Copyright 2005-2006 Fen Systems Ltd.
|
|
* Copyright 2006-2010 Solarflare Communications Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation, incorporated herein by reference.
|
|
*/
|
|
|
|
#ifndef EFX_IO_H
|
|
#define EFX_IO_H
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
/**************************************************************************
|
|
*
|
|
* NIC register I/O
|
|
*
|
|
**************************************************************************
|
|
*
|
|
* Notes on locking strategy:
|
|
*
|
|
* Many CSRs are very wide and cannot be read or written atomically.
|
|
* Writes from the host are buffered by the Bus Interface Unit (BIU)
|
|
* up to 128 bits. Whenever the host writes part of such a register,
|
|
* the BIU collects the written value and does not write to the
|
|
* underlying register until all 4 dwords have been written. A
|
|
* similar buffering scheme applies to host access to the NIC's 64-bit
|
|
* SRAM.
|
|
*
|
|
* Writes to different CSRs and 64-bit SRAM words must be serialised,
|
|
* since interleaved access can result in lost writes. We use
|
|
* efx_nic::biu_lock for this.
|
|
*
|
|
* We also serialise reads from 128-bit CSRs and SRAM with the same
|
|
* spinlock. This may not be necessary, but it doesn't really matter
|
|
* as there are no such reads on the fast path.
|
|
*
|
|
* The DMA descriptor pointers (RX_DESC_UPD and TX_DESC_UPD) are
|
|
* 128-bit but are special-cased in the BIU to avoid the need for
|
|
* locking in the host:
|
|
*
|
|
* - They are write-only.
|
|
* - The semantics of writing to these registers are such that
|
|
* replacing the low 96 bits with zero does not affect functionality.
|
|
* - If the host writes to the last dword address of such a register
|
|
* (i.e. the high 32 bits) the underlying register will always be
|
|
* written. If the collector and the current write together do not
|
|
* provide values for all 128 bits of the register, the low 96 bits
|
|
* will be written as zero.
|
|
* - If the host writes to the address of any other part of such a
|
|
* register while the collector already holds values for some other
|
|
* register, the write is discarded and the collector maintains its
|
|
* current state.
|
|
*/
|
|
|
|
#if BITS_PER_LONG == 64
|
|
#define EFX_USE_QWORD_IO 1
|
|
#endif
|
|
|
|
#ifdef EFX_USE_QWORD_IO
|
|
static inline void _efx_writeq(struct efx_nic *efx, __le64 value,
|
|
unsigned int reg)
|
|
{
|
|
__raw_writeq((__force u64)value, efx->membase + reg);
|
|
}
|
|
static inline __le64 _efx_readq(struct efx_nic *efx, unsigned int reg)
|
|
{
|
|
return (__force __le64)__raw_readq(efx->membase + reg);
|
|
}
|
|
#endif
|
|
|
|
static inline void _efx_writed(struct efx_nic *efx, __le32 value,
|
|
unsigned int reg)
|
|
{
|
|
__raw_writel((__force u32)value, efx->membase + reg);
|
|
}
|
|
static inline __le32 _efx_readd(struct efx_nic *efx, unsigned int reg)
|
|
{
|
|
return (__force __le32)__raw_readl(efx->membase + reg);
|
|
}
|
|
|
|
/* Write a normal 128-bit CSR, locking as appropriate. */
|
|
static inline void efx_writeo(struct efx_nic *efx, const efx_oword_t *value,
|
|
unsigned int reg)
|
|
{
|
|
unsigned long flags __attribute__ ((unused));
|
|
|
|
netif_vdbg(efx, hw, efx->net_dev,
|
|
"writing register %x with " EFX_OWORD_FMT "\n", reg,
|
|
EFX_OWORD_VAL(*value));
|
|
|
|
spin_lock_irqsave(&efx->biu_lock, flags);
|
|
#ifdef EFX_USE_QWORD_IO
|
|
_efx_writeq(efx, value->u64[0], reg + 0);
|
|
_efx_writeq(efx, value->u64[1], reg + 8);
|
|
#else
|
|
_efx_writed(efx, value->u32[0], reg + 0);
|
|
_efx_writed(efx, value->u32[1], reg + 4);
|
|
_efx_writed(efx, value->u32[2], reg + 8);
|
|
_efx_writed(efx, value->u32[3], reg + 12);
|
|
#endif
|
|
mmiowb();
|
|
spin_unlock_irqrestore(&efx->biu_lock, flags);
|
|
}
|
|
|
|
/* Write 64-bit SRAM through the supplied mapping, locking as appropriate. */
|
|
static inline void efx_sram_writeq(struct efx_nic *efx, void __iomem *membase,
|
|
const efx_qword_t *value, unsigned int index)
|
|
{
|
|
unsigned int addr = index * sizeof(*value);
|
|
unsigned long flags __attribute__ ((unused));
|
|
|
|
netif_vdbg(efx, hw, efx->net_dev,
|
|
"writing SRAM address %x with " EFX_QWORD_FMT "\n",
|
|
addr, EFX_QWORD_VAL(*value));
|
|
|
|
spin_lock_irqsave(&efx->biu_lock, flags);
|
|
#ifdef EFX_USE_QWORD_IO
|
|
__raw_writeq((__force u64)value->u64[0], membase + addr);
|
|
#else
|
|
__raw_writel((__force u32)value->u32[0], membase + addr);
|
|
__raw_writel((__force u32)value->u32[1], membase + addr + 4);
|
|
#endif
|
|
mmiowb();
|
|
spin_unlock_irqrestore(&efx->biu_lock, flags);
|
|
}
|
|
|
|
/* Write a 32-bit CSR or the last dword of a special 128-bit CSR */
|
|
static inline void efx_writed(struct efx_nic *efx, const efx_dword_t *value,
|
|
unsigned int reg)
|
|
{
|
|
netif_vdbg(efx, hw, efx->net_dev,
|
|
"writing register %x with "EFX_DWORD_FMT"\n",
|
|
reg, EFX_DWORD_VAL(*value));
|
|
|
|
/* No lock required */
|
|
_efx_writed(efx, value->u32[0], reg);
|
|
}
|
|
|
|
/* Read a 128-bit CSR, locking as appropriate. */
|
|
static inline void efx_reado(struct efx_nic *efx, efx_oword_t *value,
|
|
unsigned int reg)
|
|
{
|
|
unsigned long flags __attribute__ ((unused));
|
|
|
|
spin_lock_irqsave(&efx->biu_lock, flags);
|
|
value->u32[0] = _efx_readd(efx, reg + 0);
|
|
value->u32[1] = _efx_readd(efx, reg + 4);
|
|
value->u32[2] = _efx_readd(efx, reg + 8);
|
|
value->u32[3] = _efx_readd(efx, reg + 12);
|
|
spin_unlock_irqrestore(&efx->biu_lock, flags);
|
|
|
|
netif_vdbg(efx, hw, efx->net_dev,
|
|
"read from register %x, got " EFX_OWORD_FMT "\n", reg,
|
|
EFX_OWORD_VAL(*value));
|
|
}
|
|
|
|
/* Read 64-bit SRAM through the supplied mapping, locking as appropriate. */
|
|
static inline void efx_sram_readq(struct efx_nic *efx, void __iomem *membase,
|
|
efx_qword_t *value, unsigned int index)
|
|
{
|
|
unsigned int addr = index * sizeof(*value);
|
|
unsigned long flags __attribute__ ((unused));
|
|
|
|
spin_lock_irqsave(&efx->biu_lock, flags);
|
|
#ifdef EFX_USE_QWORD_IO
|
|
value->u64[0] = (__force __le64)__raw_readq(membase + addr);
|
|
#else
|
|
value->u32[0] = (__force __le32)__raw_readl(membase + addr);
|
|
value->u32[1] = (__force __le32)__raw_readl(membase + addr + 4);
|
|
#endif
|
|
spin_unlock_irqrestore(&efx->biu_lock, flags);
|
|
|
|
netif_vdbg(efx, hw, efx->net_dev,
|
|
"read from SRAM address %x, got "EFX_QWORD_FMT"\n",
|
|
addr, EFX_QWORD_VAL(*value));
|
|
}
|
|
|
|
/* Read a 32-bit CSR or SRAM */
|
|
static inline void efx_readd(struct efx_nic *efx, efx_dword_t *value,
|
|
unsigned int reg)
|
|
{
|
|
value->u32[0] = _efx_readd(efx, reg);
|
|
netif_vdbg(efx, hw, efx->net_dev,
|
|
"read from register %x, got "EFX_DWORD_FMT"\n",
|
|
reg, EFX_DWORD_VAL(*value));
|
|
}
|
|
|
|
/* Write a 128-bit CSR forming part of a table */
|
|
static inline void
|
|
efx_writeo_table(struct efx_nic *efx, const efx_oword_t *value,
|
|
unsigned int reg, unsigned int index)
|
|
{
|
|
efx_writeo(efx, value, reg + index * sizeof(efx_oword_t));
|
|
}
|
|
|
|
/* Read a 128-bit CSR forming part of a table */
|
|
static inline void efx_reado_table(struct efx_nic *efx, efx_oword_t *value,
|
|
unsigned int reg, unsigned int index)
|
|
{
|
|
efx_reado(efx, value, reg + index * sizeof(efx_oword_t));
|
|
}
|
|
|
|
/* Page-mapped register block size */
|
|
#define EFX_PAGE_BLOCK_SIZE 0x2000
|
|
|
|
/* Calculate offset to page-mapped register block */
|
|
#define EFX_PAGED_REG(page, reg) \
|
|
((page) * EFX_PAGE_BLOCK_SIZE + (reg))
|
|
|
|
/* Write the whole of RX_DESC_UPD or TX_DESC_UPD */
|
|
static inline void _efx_writeo_page(struct efx_nic *efx, efx_oword_t *value,
|
|
unsigned int reg, unsigned int page)
|
|
{
|
|
reg = EFX_PAGED_REG(page, reg);
|
|
|
|
netif_vdbg(efx, hw, efx->net_dev,
|
|
"writing register %x with " EFX_OWORD_FMT "\n", reg,
|
|
EFX_OWORD_VAL(*value));
|
|
|
|
#ifdef EFX_USE_QWORD_IO
|
|
_efx_writeq(efx, value->u64[0], reg + 0);
|
|
_efx_writeq(efx, value->u64[1], reg + 8);
|
|
#else
|
|
_efx_writed(efx, value->u32[0], reg + 0);
|
|
_efx_writed(efx, value->u32[1], reg + 4);
|
|
_efx_writed(efx, value->u32[2], reg + 8);
|
|
_efx_writed(efx, value->u32[3], reg + 12);
|
|
#endif
|
|
}
|
|
#define efx_writeo_page(efx, value, reg, page) \
|
|
_efx_writeo_page(efx, value, \
|
|
reg + \
|
|
BUILD_BUG_ON_ZERO((reg) != 0x830 && (reg) != 0xa10), \
|
|
page)
|
|
|
|
/* Write a page-mapped 32-bit CSR (EVQ_RPTR or the high bits of
|
|
* RX_DESC_UPD or TX_DESC_UPD)
|
|
*/
|
|
static inline void
|
|
_efx_writed_page(struct efx_nic *efx, const efx_dword_t *value,
|
|
unsigned int reg, unsigned int page)
|
|
{
|
|
efx_writed(efx, value, EFX_PAGED_REG(page, reg));
|
|
}
|
|
#define efx_writed_page(efx, value, reg, page) \
|
|
_efx_writed_page(efx, value, \
|
|
reg + \
|
|
BUILD_BUG_ON_ZERO((reg) != 0x400 && (reg) != 0x83c \
|
|
&& (reg) != 0xa1c), \
|
|
page)
|
|
|
|
/* Write TIMER_COMMAND. This is a page-mapped 32-bit CSR, but a bug
|
|
* in the BIU means that writes to TIMER_COMMAND[0] invalidate the
|
|
* collector register.
|
|
*/
|
|
static inline void _efx_writed_page_locked(struct efx_nic *efx,
|
|
const efx_dword_t *value,
|
|
unsigned int reg,
|
|
unsigned int page)
|
|
{
|
|
unsigned long flags __attribute__ ((unused));
|
|
|
|
if (page == 0) {
|
|
spin_lock_irqsave(&efx->biu_lock, flags);
|
|
efx_writed(efx, value, EFX_PAGED_REG(page, reg));
|
|
spin_unlock_irqrestore(&efx->biu_lock, flags);
|
|
} else {
|
|
efx_writed(efx, value, EFX_PAGED_REG(page, reg));
|
|
}
|
|
}
|
|
#define efx_writed_page_locked(efx, value, reg, page) \
|
|
_efx_writed_page_locked(efx, value, \
|
|
reg + BUILD_BUG_ON_ZERO((reg) != 0x420), \
|
|
page)
|
|
|
|
#endif /* EFX_IO_H */
|