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linux/arch/powerpc/sysdev/bestcomm/bestcomm_priv.h
Sylvain Munaut 2f9ea1bde0 [POWERPC] bestcomm: core bestcomm support for Freescale MPC5200 
This patch adds support for the core of the BestComm API
for the Freescale MPC5200(b). The BestComm engine is a
microcode-controlled / tasks-based DMA used by several
of the onchip devices.

Setting up the tasks / memory allocation and all common
low level functions are handled by this patch.
The specifics details of each tasks and their microcode
are split-out in separate patches.

This is not the official API, but a much cleaner one.
(hopefully)

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2007-10-16 17:09:34 -06:00

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/*
* Private header for the MPC52xx processor BestComm driver
*
* By private, we mean that driver should not use it directly. It's meant
* to be used by the BestComm engine driver itself and by the intermediate
* layer between the core and the drivers.
*
* Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
* Copyright (C) 2005 Varma Electronics Oy,
* ( by Andrey Volkov <avolkov@varma-el.com> )
* Copyright (C) 2003-2004 MontaVista, Software, Inc.
* ( by Dale Farnsworth <dfarnsworth@mvista.com> )
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#ifndef __BESTCOMM_PRIV_H__
#define __BESTCOMM_PRIV_H__
#include <linux/spinlock.h>
#include <linux/of.h>
#include <asm/io.h>
#include <asm/mpc52xx.h>
#include "sram.h"
/* ======================================================================== */
/* Engine related stuff */
/* ======================================================================== */
/* Zones sizes and needed alignments */
#define BCOM_MAX_TASKS 16
#define BCOM_MAX_VAR 24
#define BCOM_MAX_INC 8
#define BCOM_MAX_FDT 64
#define BCOM_MAX_CTX 20
#define BCOM_CTX_SIZE (BCOM_MAX_CTX * sizeof(u32))
#define BCOM_CTX_ALIGN 0x100
#define BCOM_VAR_SIZE (BCOM_MAX_VAR * sizeof(u32))
#define BCOM_INC_SIZE (BCOM_MAX_INC * sizeof(u32))
#define BCOM_VAR_ALIGN 0x80
#define BCOM_FDT_SIZE (BCOM_MAX_FDT * sizeof(u32))
#define BCOM_FDT_ALIGN 0x100
/**
* struct bcom_tdt - Task Descriptor Table Entry
*
*/
struct bcom_tdt {
u32 start;
u32 stop;
u32 var;
u32 fdt;
u32 exec_status; /* used internally by BestComm engine */
u32 mvtp; /* used internally by BestComm engine */
u32 context;
u32 litbase;
};
/**
* struct bcom_engine
*
* This holds all info needed globaly to handle the engine
*/
struct bcom_engine {
struct device_node *ofnode;
struct mpc52xx_sdma __iomem *regs;
phys_addr_t regs_base;
struct bcom_tdt *tdt;
u32 *ctx;
u32 *var;
u32 *fdt;
spinlock_t lock;
};
extern struct bcom_engine *bcom_eng;
/* ======================================================================== */
/* Tasks related stuff */
/* ======================================================================== */
/* Tasks image header */
#define BCOM_TASK_MAGIC 0x4243544B /* 'BCTK' */
struct bcom_task_header {
u32 magic;
u8 desc_size; /* the size fields */
u8 var_size; /* are given in number */
u8 inc_size; /* of 32-bits words */
u8 first_var;
u8 reserved[8];
};
/* Descriptors stucture & co */
#define BCOM_DESC_NOP 0x000001f8
#define BCOM_LCD_MASK 0x80000000
#define BCOM_DRD_EXTENDED 0x40000000
#define BCOM_DRD_INITIATOR_SHIFT 21
/* Tasks pragma */
#define BCOM_PRAGMA_BIT_RSV 7 /* reserved pragma bit */
#define BCOM_PRAGMA_BIT_PRECISE_INC 6 /* increment 0=when possible, */
/* 1=iter end */
#define BCOM_PRAGMA_BIT_RST_ERROR_NO 5 /* don't reset errors on */
/* task enable */
#define BCOM_PRAGMA_BIT_PACK 4 /* pack data enable */
#define BCOM_PRAGMA_BIT_INTEGER 3 /* data alignment */
/* 0=frac(msb), 1=int(lsb) */
#define BCOM_PRAGMA_BIT_SPECREAD 2 /* XLB speculative read */
#define BCOM_PRAGMA_BIT_CW 1 /* write line buffer enable */
#define BCOM_PRAGMA_BIT_RL 0 /* read line buffer enable */
/* Looks like XLB speculative read generates XLB errors when a buffer
* is at the end of the physical memory. i.e. when accessing the
* lasts words, the engine tries to prefetch the next but there is no
* next ...
*/
#define BCOM_STD_PRAGMA ((0 << BCOM_PRAGMA_BIT_RSV) | \
(0 << BCOM_PRAGMA_BIT_PRECISE_INC) | \
(0 << BCOM_PRAGMA_BIT_RST_ERROR_NO) | \
(0 << BCOM_PRAGMA_BIT_PACK) | \
(0 << BCOM_PRAGMA_BIT_INTEGER) | \
(0 << BCOM_PRAGMA_BIT_SPECREAD) | \
(1 << BCOM_PRAGMA_BIT_CW) | \
(1 << BCOM_PRAGMA_BIT_RL))
#define BCOM_PCI_PRAGMA ((0 << BCOM_PRAGMA_BIT_RSV) | \
(0 << BCOM_PRAGMA_BIT_PRECISE_INC) | \
(0 << BCOM_PRAGMA_BIT_RST_ERROR_NO) | \
(0 << BCOM_PRAGMA_BIT_PACK) | \
(1 << BCOM_PRAGMA_BIT_INTEGER) | \
(0 << BCOM_PRAGMA_BIT_SPECREAD) | \
(1 << BCOM_PRAGMA_BIT_CW) | \
(1 << BCOM_PRAGMA_BIT_RL))
#define BCOM_ATA_PRAGMA BCOM_STD_PRAGMA
#define BCOM_CRC16_DP_0_PRAGMA BCOM_STD_PRAGMA
#define BCOM_CRC16_DP_1_PRAGMA BCOM_STD_PRAGMA
#define BCOM_FEC_RX_BD_PRAGMA BCOM_STD_PRAGMA
#define BCOM_FEC_TX_BD_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_0_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_1_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_2_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_3_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_BD_0_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_DP_BD_1_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_RX_BD_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_TX_BD_PRAGMA BCOM_STD_PRAGMA
#define BCOM_GEN_LPC_PRAGMA BCOM_STD_PRAGMA
#define BCOM_PCI_RX_PRAGMA BCOM_PCI_PRAGMA
#define BCOM_PCI_TX_PRAGMA BCOM_PCI_PRAGMA
/* Initiators number */
#define BCOM_INITIATOR_ALWAYS 0
#define BCOM_INITIATOR_SCTMR_0 1
#define BCOM_INITIATOR_SCTMR_1 2
#define BCOM_INITIATOR_FEC_RX 3
#define BCOM_INITIATOR_FEC_TX 4
#define BCOM_INITIATOR_ATA_RX 5
#define BCOM_INITIATOR_ATA_TX 6
#define BCOM_INITIATOR_SCPCI_RX 7
#define BCOM_INITIATOR_SCPCI_TX 8
#define BCOM_INITIATOR_PSC3_RX 9
#define BCOM_INITIATOR_PSC3_TX 10
#define BCOM_INITIATOR_PSC2_RX 11
#define BCOM_INITIATOR_PSC2_TX 12
#define BCOM_INITIATOR_PSC1_RX 13
#define BCOM_INITIATOR_PSC1_TX 14
#define BCOM_INITIATOR_SCTMR_2 15
#define BCOM_INITIATOR_SCLPC 16
#define BCOM_INITIATOR_PSC5_RX 17
#define BCOM_INITIATOR_PSC5_TX 18
#define BCOM_INITIATOR_PSC4_RX 19
#define BCOM_INITIATOR_PSC4_TX 20
#define BCOM_INITIATOR_I2C2_RX 21
#define BCOM_INITIATOR_I2C2_TX 22
#define BCOM_INITIATOR_I2C1_RX 23
#define BCOM_INITIATOR_I2C1_TX 24
#define BCOM_INITIATOR_PSC6_RX 25
#define BCOM_INITIATOR_PSC6_TX 26
#define BCOM_INITIATOR_IRDA_RX 25
#define BCOM_INITIATOR_IRDA_TX 26
#define BCOM_INITIATOR_SCTMR_3 27
#define BCOM_INITIATOR_SCTMR_4 28
#define BCOM_INITIATOR_SCTMR_5 29
#define BCOM_INITIATOR_SCTMR_6 30
#define BCOM_INITIATOR_SCTMR_7 31
/* Initiators priorities */
#define BCOM_IPR_ALWAYS 7
#define BCOM_IPR_SCTMR_0 2
#define BCOM_IPR_SCTMR_1 2
#define BCOM_IPR_FEC_RX 6
#define BCOM_IPR_FEC_TX 5
#define BCOM_IPR_ATA_RX 4
#define BCOM_IPR_ATA_TX 3
#define BCOM_IPR_SCPCI_RX 2
#define BCOM_IPR_SCPCI_TX 2
#define BCOM_IPR_PSC3_RX 2
#define BCOM_IPR_PSC3_TX 2
#define BCOM_IPR_PSC2_RX 2
#define BCOM_IPR_PSC2_TX 2
#define BCOM_IPR_PSC1_RX 2
#define BCOM_IPR_PSC1_TX 2
#define BCOM_IPR_SCTMR_2 2
#define BCOM_IPR_SCLPC 2
#define BCOM_IPR_PSC5_RX 2
#define BCOM_IPR_PSC5_TX 2
#define BCOM_IPR_PSC4_RX 2
#define BCOM_IPR_PSC4_TX 2
#define BCOM_IPR_I2C2_RX 2
#define BCOM_IPR_I2C2_TX 2
#define BCOM_IPR_I2C1_RX 2
#define BCOM_IPR_I2C1_TX 2
#define BCOM_IPR_PSC6_RX 2
#define BCOM_IPR_PSC6_TX 2
#define BCOM_IPR_IRDA_RX 2
#define BCOM_IPR_IRDA_TX 2
#define BCOM_IPR_SCTMR_3 2
#define BCOM_IPR_SCTMR_4 2
#define BCOM_IPR_SCTMR_5 2
#define BCOM_IPR_SCTMR_6 2
#define BCOM_IPR_SCTMR_7 2
/* ======================================================================== */
/* API */
/* ======================================================================== */
extern struct bcom_task *bcom_task_alloc(int bd_count, int bd_size, int priv_size);
extern void bcom_task_free(struct bcom_task *tsk);
extern int bcom_load_image(int task, u32 *task_image);
extern void bcom_set_initiator(int task, int initiator);
#define TASK_ENABLE 0x8000
static inline void
bcom_enable_task(int task)
{
u16 reg;
reg = in_be16(&bcom_eng->regs->tcr[task]);
out_be16(&bcom_eng->regs->tcr[task], reg | TASK_ENABLE);
}
static inline void
bcom_disable_task(int task)
{
u16 reg = in_be16(&bcom_eng->regs->tcr[task]);
out_be16(&bcom_eng->regs->tcr[task], reg & ~TASK_ENABLE);
}
static inline u32 *
bcom_task_desc(int task)
{
return bcom_sram_pa2va(bcom_eng->tdt[task].start);
}
static inline int
bcom_task_num_descs(int task)
{
return (bcom_eng->tdt[task].stop - bcom_eng->tdt[task].start)/sizeof(u32) + 1;
}
static inline u32 *
bcom_task_var(int task)
{
return bcom_sram_pa2va(bcom_eng->tdt[task].var);
}
static inline u32 *
bcom_task_inc(int task)
{
return &bcom_task_var(task)[BCOM_MAX_VAR];
}
static inline int
bcom_drd_is_extended(u32 desc)
{
return (desc) & BCOM_DRD_EXTENDED;
}
static inline int
bcom_desc_is_drd(u32 desc)
{
return !(desc & BCOM_LCD_MASK) && desc != BCOM_DESC_NOP;
}
static inline int
bcom_desc_initiator(u32 desc)
{
return (desc >> BCOM_DRD_INITIATOR_SHIFT) & 0x1f;
}
static inline void
bcom_set_desc_initiator(u32 *desc, int initiator)
{
*desc = (*desc & ~(0x1f << BCOM_DRD_INITIATOR_SHIFT)) |
((initiator & 0x1f) << BCOM_DRD_INITIATOR_SHIFT);
}
static inline void
bcom_set_task_pragma(int task, int pragma)
{
u32 *fdt = &bcom_eng->tdt[task].fdt;
*fdt = (*fdt & ~0xff) | pragma;
}
static inline void
bcom_set_task_auto_start(int task, int next_task)
{
u16 __iomem *tcr = &bcom_eng->regs->tcr[task];
out_be16(tcr, (in_be16(tcr) & ~0xff) | 0x00c0 | next_task);
}
static inline void
bcom_set_tcr_initiator(int task, int initiator)
{
u16 __iomem *tcr = &bcom_eng->regs->tcr[task];
out_be16(tcr, (in_be16(tcr) & ~0x1f00) | ((initiator & 0x1f) << 8));
}
#endif /* __BESTCOMM_PRIV_H__ */
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