SuperH Interfaces Guide¶

Author:: Paul Mundt

Memory Management¶

SH-4¶

Store Queue API¶

void sq_flush_range(unsigned long start, unsigned int len)¶: Flush (prefetch) a specific SQ range

Parameters

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

Description

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

unsigned long sq_remap(unsigned long phys, unsigned int size, const char *name, pgprot_t prot)¶: Map a physical address through the Store Queues

Parameters

unsigned long phys: Physical address of mapping.
unsigned int size: Length of mapping.
const char *name: User invoking mapping.
pgprot_t 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.

void sq_unmap(unsigned long vaddr)¶: Unmap a Store Queue allocation

Parameters

unsigned long 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.

Machine Specific Interfaces¶

mach-dreamcast¶

int aica_rtc_gettimeofday(struct device *dev, struct rtc_time *tm)¶: Get the time from the AICA RTC

Parameters

struct device *dev: the RTC device (ignored)
struct rtc_time *tm: pointer to resulting RTC time structure

Description

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

int aica_rtc_settimeofday(struct device *dev, struct rtc_time *tm)¶: Set the AICA RTC to the current time

Parameters

struct device *dev: the RTC device (ignored)
struct rtc_time *tm: pointer to new RTC time structure

Description

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

mach-x3proto¶

int ilsel_enable(ilsel_source_t set)¶: Enable an ILSEL set.

Parameters

ilsel_source_t 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().

int ilsel_enable_fixed(ilsel_source_t set, unsigned int level)¶: Enable an ILSEL set at a fixed interrupt level

Parameters

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

void ilsel_disable(unsigned int irq)¶: Disable an ILSEL set

Parameters

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

Description

Disable a previously enabled ILSEL set.

Busses¶

Maple¶

int maple_driver_register(struct maple_driver *drv)¶: register a maple driver

Parameters

struct maple_driver *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.

void maple_driver_unregister(struct maple_driver *drv)¶: unregister a maple driver.

Parameters

struct maple_driver *drv: maple driver to unregister.

Description

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

void maple_getcond_callback(struct maple_device *dev, void (*callback)(struct mapleq *mq), unsigned long interval, unsigned long function)¶: setup handling MAPLE_COMMAND_GETCOND

Parameters

struct maple_device *dev: device responding
void (*callback) (struct mapleq *mq): handler callback
unsigned long interval: interval in jiffies between callbacks
unsigned long function: the function code for the device

int maple_add_packet(struct maple_device *mdev, u32 function, u32 command, size_t length, void *data)¶: add a single instruction to the maple bus queue

Parameters

struct maple_device *mdev: maple device
u32 function: function on device being queried
u32 command: maple command to add
size_t length: length of command string (in 32 bit words)
void *data: remainder of command string