SuperH Interfaces Guide

Paul Mundt

<lethal@linux-sh.org>

This documentation 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.

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You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

For more details see the file COPYING in the source distribution of Linux.

Table of Contents

1. Memory Management

SH-4

Store Queue API

SH-5

TLB Interfaces

2. Machine Specific Interfaces

mach-dreamcast
mach-x3proto

3. Busses

SuperHyway
Maple

Chapter 1. Memory Management

Table of Contents

SH-4

Store Queue API

SH-5

TLB Interfaces

SH-4

Store Queue API

Name

sq_flush_range — Flush (prefetch) a specific SQ range

Synopsis

`void sq_flush_range (`	`start`,
	`len)`;

unsigned long start;
unsigned int len;

Arguments

start: the store queue address to start flushing from
len: the length to flush

Description

Flushes the store queue cache from start to start + len in a linear fashion.

Name

sq_remap — Map a physical address through the Store Queues

Synopsis

`unsigned long sq_remap (`	`phys`,
	`size`,
	`name`,
	`prot)`;

unsigned long phys;
unsigned int size;
const char * name;
pgprot_t prot;

Arguments

phys: Physical address of mapping.
size: Length of mapping.
name: User invoking mapping.
prot: Protection bits.

Description

Remaps the physical address phys through the next available store queue address of size length. name is logged at boot time as well as through the sysfs interface.

Name

sq_unmap — Unmap a Store Queue allocation

Synopsis

void sq_unmap ( vaddr);

unsigned long vaddr;

Arguments

vaddr: Pre-allocated Store Queue mapping.

Description

Unmaps the store queue allocation map that was previously created by sq_remap. Also frees up the pte that was previously inserted into the kernel page table and discards the UTLB translation.

SH-5

TLB Interfaces

Name

sh64_tlb_init — Perform initial setup for the DTLB and ITLB.

Synopsis

int sh64_tlb_init ( void);

void;

Arguments

void: no arguments

Name

sh64_next_free_dtlb_entry — Find the next available DTLB entry

Synopsis

unsigned long long sh64_next_free_dtlb_entry ( void);

void;

Arguments

void: no arguments

Name

sh64_get_wired_dtlb_entry — Allocate a wired (locked-in) entry in the DTLB

Synopsis

unsigned long long sh64_get_wired_dtlb_entry ( void);

void;

Arguments

void: no arguments

Name

sh64_put_wired_dtlb_entry — Free a wired (locked-in) entry in the DTLB.

Synopsis

int sh64_put_wired_dtlb_entry ( entry);

unsigned long long entry;

Arguments

entry: Address of TLB slot.

Description

Works like a stack, last one to allocate must be first one to free.

Name

sh64_setup_tlb_slot — Load up a translation in a wired slot.

Synopsis

`void sh64_setup_tlb_slot (`	`config_addr`,
	`eaddr`,
	`asid`,
	`paddr)`;

unsigned long long config_addr;
unsigned long eaddr;
unsigned long asid;
unsigned long paddr;

Arguments

config_addr: Address of TLB slot.
eaddr: Virtual address.
asid: Address Space Identifier.
paddr: Physical address.

Description

Load up a virtual<->physical translation for eaddr<->paddr in the pre-allocated TLB slot config_addr (see sh64_get_wired_dtlb_entry).

Name

sh64_teardown_tlb_slot — Teardown a translation.

Synopsis

void sh64_teardown_tlb_slot ( config_addr);

unsigned long long config_addr;

Arguments

config_addr: Address of TLB slot.

Description

Teardown any existing mapping in the TLB slot config_addr.

Name

for_each_dtlb_entry — Iterate over free (non-wired) DTLB entries

Synopsis

for_each_dtlb_entry ( tlb);

tlb;

Arguments

tlb: TLB entry

Name

for_each_itlb_entry — Iterate over free (non-wired) ITLB entries

Synopsis

for_each_itlb_entry ( tlb);

tlb;

Arguments

tlb: TLB entry

Name

__flush_tlb_slot — Flushes TLB slot slot.

Synopsis

void __flush_tlb_slot ( slot);

unsigned long long slot;

Arguments

slot: Address of TLB slot.

Chapter 2. Machine Specific Interfaces

Table of Contents

mach-dreamcast
mach-x3proto

mach-dreamcast

Name

aica_rtc_gettimeofday — Get the time from the AICA RTC

Synopsis

void aica_rtc_gettimeofday ( ts);

struct timespec * ts;

Arguments

ts: pointer to resulting timespec

Description

Grabs the current RTC seconds counter and adjusts it to the Unix Epoch.

Name

aica_rtc_settimeofday — Set the AICA RTC to the current time

Synopsis

int aica_rtc_settimeofday ( secs);

const time_t secs;

Arguments

secs: contains the time_t to set

Description

Adjusts the given tv to the AICA Epoch and sets the RTC seconds counter.

mach-x3proto

Name

ilsel_enable — Enable an ILSEL set.

Synopsis

int ilsel_enable ( set);

ilsel_source_t set;

Arguments

set: ILSEL source (see ilsel_source_t enum in include/asm-sh/ilsel.h).

Description

Enables a given non-aliased ILSEL source (<= ILSEL_KEY) at the highest available interrupt level. Callers should take care to order callsites noting descending interrupt levels. Aliasing FPGA and external board IRQs need to use ilsel_enable_fixed.

The return value is an IRQ number that can later be taken down with ilsel_disable.

Name

ilsel_enable_fixed — Enable an ILSEL set at a fixed interrupt level

Synopsis

`int ilsel_enable_fixed (`	`set`,
	`level)`;

ilsel_source_t set;
unsigned int level;

Arguments

set: ILSEL source (see ilsel_source_t enum in include/asm-sh/ilsel.h).
level: Interrupt level (1 - 15)

Description

Enables a given ILSEL source at a fixed interrupt level. Necessary both for level reservation as well as for aliased sources that only exist on special ILSEL#s.

Returns an IRQ number (as ilsel_enable).

Name

ilsel_disable — Disable an ILSEL set

Synopsis

void ilsel_disable ( irq);

unsigned int irq;

Arguments

irq: Bit position for ILSEL set value (retval from enable routines)

Description

Disable a previously enabled ILSEL set.

Chapter 3. Busses

Table of Contents

SuperHyway
Maple

SuperHyway

Name

superhyway_add_device — Add a SuperHyway module

Synopsis

`int superhyway_add_device (`	`base`,
	`sdev`,
	`bus)`;

unsigned long base;
struct superhyway_device * sdev;
struct superhyway_bus * bus;

Arguments

base: Physical address where module is mapped.
sdev: SuperHyway device to add, or NULL to allocate a new one.
bus: Bus where SuperHyway module resides.

Description

This is responsible for adding a new SuperHyway module. This sets up a new struct superhyway_device for the module being added if sdev == NULL.

Devices are initially added in the order that they are scanned (from the top-down of the memory map), and are assigned an ID based on the order that they are added. Any manual addition of a module will thus get the ID after the devices already discovered regardless of where it resides in memory.

Further work can and should be done in superhyway_scan_bus, to be sure that any new modules are properly discovered and subsequently registered.

Name

superhyway_register_driver — Register a new SuperHyway driver

Synopsis

int superhyway_register_driver ( drv);

struct superhyway_driver * drv;

Arguments

drv: SuperHyway driver to register.

Description

This registers the passed in drv. Any devices matching the id table will automatically be populated and handed off to the driver's specified probe routine.

Name

superhyway_unregister_driver — Unregister a SuperHyway driver

Synopsis

void superhyway_unregister_driver ( drv);

struct superhyway_driver * drv;

Arguments

drv: SuperHyway driver to unregister.

Description

This cleans up after superhyway_register_driver, and should be invoked in the exit path of any module drivers.

Maple

Name

maple_driver_register — register a maple driver

Synopsis

int maple_driver_register ( drv);

struct maple_driver * drv;

Arguments

drv: maple driver to be registered.

Description

Registers the passed in drv, while updating the bus type. Devices with matching function IDs will be automatically probed.

Name

maple_driver_unregister — unregister a maple driver.

Synopsis

void maple_driver_unregister ( drv);

struct maple_driver * drv;

Arguments

drv: maple driver to unregister.

Description

Cleans up after maple_driver_register. To be invoked in the exit path of any module drivers.

Name

maple_getcond_callback — setup handling MAPLE_COMMAND_GETCOND

Synopsis

`void maple_getcond_callback (`	`dev`,
	`callback`,
	`interval`,
	`function)`;

struct maple_device * dev;

void (*callback)
     (struct mapleq *mq)

;
unsigned long interval;
unsigned long function;

Arguments

dev: device responding
callback: handler callback
interval: interval in jiffies between callbacks
function: the function code for the device

Name

maple_add_packet — add a single instruction to the maple bus queue

Synopsis

`int maple_add_packet (`	`mdev`,
	`function`,
	`command`,
	`length`,
	`data)`;

struct maple_device * mdev;
u32 function;
u32 command;
size_t length;
void * data;

Arguments

mdev: maple device
function: function on device being queried
command: maple command to add
length: length of command string (in 32 bit words)
data: remainder of command string