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/*
* arch/powerpc/platforms/embedded6xx/starlet-ipc.c
*
* Nintendo Wii starlet IPC driver
* Copyright (C) 2008-2009 The GameCube Linux Team
* Copyright (C) 2008,2009 Albert Herranz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
*/
#define DEBUG
/*#define DBG(fmt, arg...) pr_debug(fmt, ##arg)*/
#define DBG(fmt, arg...) drv_printk(KERN_INFO, fmt, ##arg)
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/of_platform.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/dmapool.h>
#include <linux/dma-mapping.h>
#include <linux/random.h>
#include <linux/scatterlist.h>
#include <linux/string.h>
#include <asm/io.h>
#include <asm/bitops.h>
#include <asm/time.h>
#include <asm/starlet.h>
#define DRV_MODULE_NAME "starlet-ipc"
#define DRV_DESCRIPTION "Nintendo Wii starlet IPC driver"
#define DRV_AUTHOR "Albert Herranz"
static char starlet_ipc_driver_version[] = "0.3i";
#define drv_printk(level, format, arg...) \
printk(level DRV_MODULE_NAME ": " format , ## arg)
/*
* Hardware registers
*/
#define STARLET_IPC_TXBUF 0x00 /* data from cpu to starlet */
#define STARLET_IPC_CSR 0x04
#define STARLET_IPC_CSR_TXSTART (1<<0) /* start transmit */
#define STARLET_IPC_CSR_TBEI (1<<1) /* tx buf empty int */
#define STARLET_IPC_CSR_RBFI (1<<2) /* rx buf full int */
#define STARLET_IPC_CSR_RXRDY (1<<3) /* receiver ready */
#define STARLET_IPC_CSR_RBFIMASK (1<<4) /* rx buf full int mask */
#define STARLET_IPC_CSR_TBEIMASK (1<<5) /* tx buf empty int mask */
#define STARLET_IPC_RXBUF 0x08 /* data from starlet to cpu */
#define STARLET_IPC_ISR 0x30
/* IOS calls */
#define STARLET_IOS_OPEN 0x01
#define STARLET_IOS_CLOSE 0x02
#define STARLET_IOS_IOCTL 0x06
#define STARLET_IOS_IOCTLV 0x07
/* starlet_ipc_device flags */
enum {
__TX_INUSE = 0, /* tx buffer in use flag */
__REBOOT, /* request causes IOS reboot */
};
/*
*
* Hardware.
*/
/*
* Update control and status register.
*/
static inline void starlet_ipc_update_csr(void __iomem *io_base, u32 val)
{
u32 csr;
csr = in_be32(io_base + STARLET_IPC_CSR);
/* preserve interrupt masks */
csr &= STARLET_IPC_CSR_RBFIMASK | STARLET_IPC_CSR_TBEIMASK;
csr |= val;
out_be32(io_base + STARLET_IPC_CSR, csr);
}
/*
* Put data for starlet in the transmit fifo.
*/
static inline void starlet_ipc_sendto(void __iomem *io_base, u32 data)
{
out_be32(io_base + STARLET_IPC_TXBUF, data);
}
/*
* Get data from starlet out the receive fifo.
*/
static inline u32 starlet_ipc_recvfrom(void __iomem *io_base)
{
return in_be32(io_base + STARLET_IPC_RXBUF);
}
/*
* Issue an end-of-interrupt sequence.
*/
static void starlet_ipc_rx_ready(void __iomem *io_base)
{
starlet_ipc_update_csr(io_base, STARLET_IPC_CSR_RXRDY);
}
/*
* Calm the hardware down.
*/
static void starlet_ipc_quiesce(struct starlet_ipc_device *ipc_dev)
{
u32 csr;
/* ack and disable MBOX? and REPLY interrupts */
csr = in_be32(ipc_dev->io_base + STARLET_IPC_CSR);
csr &= ~(STARLET_IPC_CSR_TBEIMASK | STARLET_IPC_CSR_RBFIMASK);
csr |= STARLET_IPC_CSR_TBEI | STARLET_IPC_CSR_RBFI;
out_be32(ipc_dev->io_base + STARLET_IPC_CSR, csr);
}
/*
* Request routines.
*
*/
#if 0
#define __case_string(_s) \
case _s: \
str = #_s; \
break;
static char *stipc_cmd_string(u32 cmd)
{
char *str = "unknown";
switch (cmd) {
__case_string(STARLET_IOS_OPEN)
__case_string(STARLET_IOS_CLOSE)
__case_string(STARLET_IOS_IOCTL)
__case_string(STARLET_IOS_IOCTLV)
}
return str;
}
static void starlet_ipc_pretty_print_request(struct starlet_ipc_request *req)
{
drv_printk(KERN_INFO, "\n"
" struct starlet_ipc_request = {\n"
" cmd = %s (0x%08x)\n"
" result = %d (0x%08x)%s\n"
" seconds_elapsed = %u\n"
" dma_addr = %p\n"
" };\n"
,
stipc_cmd_string(req->cmd), req->cmd,
req->result, req->result,
(req->result == 0xdeadbeef) ? " /* pending */" : "",
jiffies_to_msecs(jiffies - req->jiffies) / 1000,
(void *)req->dma_addr
);
}
#endif
static void starlet_ipc_debug_print_request(struct starlet_ipc_request *req)
{
#if 0
DBG("cmd=%x, result=%x, fd=%x, dma_addr=%p\n",
req->cmd, req->result, req->fd, (void *)req->dma_addr);
#endif
}
struct starlet_ipc_request *
starlet_ipc_alloc_request(struct starlet_ipc_device *ipc_dev, gfp_t flags)
{
struct starlet_ipc_request *req;
dma_addr_t dma_addr;
req = dma_pool_alloc(ipc_dev->dma_pool, flags, &dma_addr);
if (req) {
memset(req, 0, sizeof(*req));
req->ipc_dev = ipc_dev;
req->result = 0xdeadbeef;
req->sig = ipc_dev->random_id;
req->dma_addr = dma_addr;
INIT_LIST_HEAD(&req->node);
}
return req;
}
void starlet_ipc_free_request(struct starlet_ipc_request *req)
{
dma_pool_free(req->ipc_dev->dma_pool, req, req->dma_addr);
}
static void starlet_ipc_start_request(struct starlet_ipc_request *req)
{
struct starlet_ipc_device *ipc_dev = req->ipc_dev;
void __iomem *io_base = ipc_dev->io_base;
unsigned long flags;
starlet_ipc_debug_print_request(req);
spin_lock_irqsave(&ipc_dev->list_lock, flags);
list_add_tail(&req->node, &ipc_dev->outstanding_list);
ipc_dev->nr_outstanding++;
req->jiffies = jiffies;
spin_unlock_irqrestore(&ipc_dev->list_lock, flags);
starlet_ipc_sendto(io_base, (u32) req->dma_addr);
starlet_ipc_update_csr(io_base, STARLET_IPC_CSR_TXSTART);
}
static void starlet_ipc_complete_request(struct starlet_ipc_request *req)
{
struct starlet_ipc_device *ipc_dev = req->ipc_dev;
unsigned long flags;
spin_lock_irqsave(&ipc_dev->list_lock, flags);
list_del_init(&req->node);
ipc_dev->nr_outstanding--;
req->jiffies = 0;
spin_unlock_irqrestore(&ipc_dev->list_lock, flags);
starlet_ipc_debug_print_request(req);
/* per request completion callback */
if (req->complete)
req->complete(req);
/* async callback */
if (req->done)
req->done(req);
}
static void starlet_ipc_submit_request(struct starlet_ipc_request *req)
{
struct starlet_ipc_device *ipc_dev = req->ipc_dev;
unsigned long flags;
if (test_and_set_bit(__TX_INUSE, &ipc_dev->flags)) {
spin_lock_irqsave(&ipc_dev->list_lock, flags);
list_add_tail(&req->node, &ipc_dev->pending_list);
ipc_dev->nr_pending++;
spin_unlock_irqrestore(&ipc_dev->list_lock, flags);
} else
starlet_ipc_start_request(req);
}
static struct starlet_ipc_request *
starlet_ipc_find_request_by_bus_addr(struct starlet_ipc_device *ipc_dev,
dma_addr_t req_bus_addr)
{
struct starlet_ipc_request *req;
unsigned long flags;
spin_lock_irqsave(&ipc_dev->list_lock, flags);
list_for_each_entry(req, &ipc_dev->outstanding_list, node) {
if (req && req->sig != ipc_dev->random_id) {
drv_printk(KERN_ERR, "IPC trash detected\n");
/* leak memory, we can't safely use it */
ipc_dev->nr_outstanding = 0;
INIT_LIST_HEAD(&ipc_dev->outstanding_list);
INIT_LIST_HEAD(&req->node);
spin_unlock_irqrestore(&ipc_dev->list_lock, flags);
return NULL;
}
if (req && req_bus_addr == req->dma_addr) {
spin_unlock_irqrestore(&ipc_dev->list_lock, flags);
return req;
}
}
spin_unlock_irqrestore(&ipc_dev->list_lock, flags);
return NULL;
}
/*
* Interrupt handlers.
*
*/
/*
* Transmit Buffer Empty Interrupt dispatcher.
*/
static int starlet_ipc_dispatch_tbei(struct starlet_ipc_device *ipc_dev)
{
void __iomem *io_base = ipc_dev->io_base;
struct starlet_ipc_request *req = NULL;
struct list_head *pending = &ipc_dev->pending_list;
unsigned long flags;
spin_lock_irqsave(&ipc_dev->list_lock, flags);
if (!list_empty(pending)) {
req = list_entry(pending->next, struct starlet_ipc_request,
node);
list_del_init(&req->node);
ipc_dev->nr_pending--;
}
spin_unlock_irqrestore(&ipc_dev->list_lock, flags);
if (req)
starlet_ipc_start_request(req);
else {
if (!test_and_clear_bit(__TX_INUSE, &ipc_dev->flags)) {
/* we get two consecutive TBEIs on reboot */
if (test_and_clear_bit(__REBOOT, &ipc_dev->flags)) {
req = ipc_dev->req;
ipc_dev->req = NULL;
if (req) {
req->result = 0;
starlet_ipc_complete_request(req);
}
starlet_ipc_rx_ready(io_base);
}
}
}
return IRQ_HANDLED;
}
/*
* Receive Buffer Full Interrupt dispatcher.
*/
static int starlet_ipc_dispatch_rbfi(struct starlet_ipc_device *ipc_dev)
{
void __iomem *io_base = ipc_dev->io_base;
struct starlet_ipc_request *req;
unsigned long req_bus_addr;
req_bus_addr = starlet_ipc_recvfrom(io_base);
if (!req_bus_addr)
return IRQ_NONE;
req = starlet_ipc_find_request_by_bus_addr(ipc_dev, req_bus_addr);
if (req)
starlet_ipc_complete_request(req);
else
drv_printk(KERN_WARNING, "unknown request, bus=%p\n",
(void *)req_bus_addr);
starlet_ipc_rx_ready(io_base);
return IRQ_HANDLED;
}
typedef int (*ipc_handler_t) (struct starlet_ipc_device *);
static int
starlet_ipc_cond_dispatch_irq(struct starlet_ipc_device *ipc_dev,
u32 irqmask, u32 irq, ipc_handler_t handler)
{
void __iomem *io_base = ipc_dev->io_base;
u32 csr;
int retval = IRQ_NONE;
csr = in_be32(io_base + STARLET_IPC_CSR);
if ((csr & (irqmask | irq)) == (irqmask | irq)) {
/* early ack */
starlet_ipc_update_csr(io_base, irq);
out_be32(io_base + STARLET_IPC_ISR, 0x40000000); /* huh? */
retval = handler(ipc_dev);
}
return retval;
}
static irqreturn_t starlet_ipc_handler(int irq, void *data)
{
struct starlet_ipc_device *ipc_dev = (struct starlet_ipc_device *)data;
int handled = 0;
int retval;
/* starlet acked a request */
retval = starlet_ipc_cond_dispatch_irq(ipc_dev,
STARLET_IPC_CSR_TBEIMASK,
STARLET_IPC_CSR_TBEI,
starlet_ipc_dispatch_tbei);
if (retval == IRQ_HANDLED)
handled++;
/* starlet delivered a reply */
retval = starlet_ipc_cond_dispatch_irq(ipc_dev,
STARLET_IPC_CSR_RBFIMASK,
STARLET_IPC_CSR_RBFI,
starlet_ipc_dispatch_rbfi);
if (retval == IRQ_HANDLED)
handled++;
if (!handled)
return IRQ_NONE;
return IRQ_HANDLED;
}
/*
* IPC Calls.
*
*/
static int starlet_ipc_call_done(struct starlet_ipc_request *req)
{
complete(req->done_data);
return 0;
}
static int starlet_ipc_call(struct starlet_ipc_request *req)
{
DECLARE_COMPLETION(complete);
req->done_data = &complete;
req->done = starlet_ipc_call_done;
starlet_ipc_submit_request(req);
wait_for_completion(&complete);
return req->result;
}
static void starlet_ipc_call_nowait(struct starlet_ipc_request *req,
starlet_ipc_callback_t callback, void *arg)
{
req->done_data = arg;
req->done = callback;
starlet_ipc_submit_request(req);
}
static DEFINE_SPINLOCK(starlet_ipc_poll_lock);
#define __spin_event_timeout(condition, usecs, result, __end_ts) \
for (__end_ts = get_tbl() + tb_ticks_per_usec * usecs; \
!(result = (condition)) && __end_ts - get_tbl() > 0;)
static int __starlet_ipc_poll_req(struct starlet_ipc_request *req,
unsigned long usecs)
{
struct starlet_ipc_device *ipc_dev = req->ipc_dev;
unsigned long counter;
int result;
__spin_event_timeout(req->jiffies == 0 &&
!test_bit(__REBOOT, &ipc_dev->flags),
usecs, result, counter)
starlet_ipc_handler(0, ipc_dev);
if (!result)
req->result = -ETIME;
/* debug */
if (req->result < 0)
drv_printk(KERN_ERR, "%s: result %d\n", __func__,
req->result);
return req->result;
}
static int starlet_ipc_call_polled(struct starlet_ipc_request *req,
unsigned long usecs)
{
unsigned long flags;
int error;
req->done = NULL;
spin_lock_irqsave(&starlet_ipc_poll_lock, flags);
starlet_ipc_submit_request(req);
error = __starlet_ipc_poll_req(req, usecs);
spin_unlock_irqrestore(&starlet_ipc_poll_lock, flags);
return error;
}
/*
*
* IOS High level interfaces.
*/
static struct starlet_ipc_device *starlet_ipc_device_instance;
/**
*
*/
struct starlet_ipc_device *starlet_ipc_get_device(void)
{
if (!starlet_ipc_device_instance)
drv_printk(KERN_ERR, "uninitialized device instance!\n");
return starlet_ipc_device_instance;
}
EXPORT_SYMBOL_GPL(starlet_ipc_get_device);
/**
*
*/
static int _starlet_open(const char *pathname, int flags,
gfp_t gfp_flags, int poll, unsigned long usecs)
{
#define STSD_OPEN_BUF_SIZE 64
static char open_buf[STSD_OPEN_BUF_SIZE]
__attribute__ ((aligned(STARLET_IPC_DMA_ALIGN + 1)));
static DEFINE_MUTEX(open_buf_lock);
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_ipc_request *req;
dma_addr_t dma_addr;
char *local_pathname = NULL;
size_t len;
int error = -ENOMEM;
if (!ipc_dev)
return -ENODEV;
req = starlet_ipc_alloc_request(ipc_dev, gfp_flags);
if (req) {
len = strlen(pathname) + 1;
if (len < sizeof(open_buf)) {
if (mutex_trylock(&open_buf_lock))
local_pathname = open_buf;
}
if (!local_pathname) {
local_pathname = starlet_kzalloc(len, gfp_flags);
if (!local_pathname) {
starlet_ipc_free_request(req);
return -ENOMEM;
}
}
strncpy(local_pathname, pathname, len-1);
local_pathname[len-1] = 0;
dma_addr = dma_map_single(ipc_dev->dev, local_pathname, len,
DMA_TO_DEVICE);
req->cmd = STARLET_IOS_OPEN;
req->open.pathname = dma_addr; /* bus address */
req->open.mode = flags;
error = (poll) ? starlet_ipc_call_polled(req, usecs) :
starlet_ipc_call(req);
dma_unmap_single(ipc_dev->dev, dma_addr, len, DMA_TO_DEVICE);
if (local_pathname == open_buf)
mutex_unlock(&open_buf_lock);
else
starlet_kfree(local_pathname);
starlet_ipc_free_request(req);
}
if (error < 0)
DBG("%s: %s: error=%d (%x)\n", __func__, pathname,
error, error);
return error;
}
int starlet_open(const char *pathname, int flags)
{
return _starlet_open(pathname, flags, GFP_KERNEL, 0, 0);
}
EXPORT_SYMBOL_GPL(starlet_open);
int starlet_open_polled(const char *pathname, int flags,
unsigned long usecs)
{
return _starlet_open(pathname, flags, GFP_ATOMIC, 1, usecs);
}
EXPORT_SYMBOL_GPL(starlet_open_polled);
/*
*
*/
static int _starlet_close(int fd, gfp_t gfp_flags, int poll,
unsigned long usecs)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_ipc_request *req;
int error = -ENOMEM;
if (!ipc_dev)
return -ENODEV;
req = starlet_ipc_alloc_request(ipc_dev, gfp_flags);
if (req) {
req->cmd = STARLET_IOS_CLOSE;
req->fd = fd;
error = (poll) ? starlet_ipc_call_polled(req, usecs) :
starlet_ipc_call(req);
starlet_ipc_free_request(req);
}
return error;
}
int starlet_close(int fd)
{
return _starlet_close(fd, GFP_KERNEL, 0, 0);
}
EXPORT_SYMBOL_GPL(starlet_close);
int starlet_close_polled(int fd, unsigned long usecs)
{
return _starlet_close(fd, GFP_ATOMIC, 1, usecs);
}
EXPORT_SYMBOL_GPL(starlet_close_polled);
/*
* starlet_ioctl*
*
*/
static int starlet_ioctl_dma_complete(struct starlet_ipc_request *req)
{
return 0;
}
/*
*
*/
int starlet_ioctl_dma_prepare(struct starlet_ipc_request *req,
int fd, int request,
dma_addr_t ibuf, size_t ilen,
dma_addr_t obuf, size_t olen)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
if (!ipc_dev)
return -ENODEV;
req->cmd = STARLET_IOS_IOCTL;
req->fd = fd;
req->ioctl.request = (u32) request;
req->ioctl.ibuf = ibuf;
req->ioctl.ilen = ilen;
req->ioctl.obuf = obuf;
req->ioctl.olen = olen;
req->complete = starlet_ioctl_dma_complete;
return 0;
}
/*
*
*/
int starlet_ioctl_dma(int fd, int request,
dma_addr_t ibuf, size_t ilen,
dma_addr_t obuf, size_t olen)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_ipc_request *req;
int error;
req = starlet_ipc_alloc_request(ipc_dev, GFP_ATOMIC);
if (!req)
return -ENOMEM;
error = starlet_ioctl_dma_prepare(req, fd, request,
ibuf, ilen,
obuf, olen);
if (!error)
error = starlet_ipc_call(req);
starlet_ipc_free_request(req);
if (error)
DBG("%s: error=%d (%x)\n", __func__, error, error);
return error;
}
EXPORT_SYMBOL_GPL(starlet_ioctl_dma);
/**
*
*/
int starlet_ioctl_dma_nowait(int fd, int request,
dma_addr_t ibuf, size_t ilen,
dma_addr_t obuf, size_t olen,
starlet_ipc_callback_t callback, void *arg)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_ipc_request *req;
int error;
req = starlet_ipc_alloc_request(ipc_dev, GFP_ATOMIC);
if (!req)
return -ENOMEM;
error = starlet_ioctl_dma_prepare(req,
fd, request,
ibuf, ilen,
obuf, olen);
if (!error)
starlet_ipc_call_nowait(req, callback, arg);
else
starlet_ipc_free_request(req);
if (error)
DBG("%s: error=%d (%x)\n", __func__, error, error);
return error;
}
EXPORT_SYMBOL_GPL(starlet_ioctl_dma_nowait);
static int starlet_ioctl_complete(struct starlet_ipc_request *req)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
dma_addr_t ibuf_ba, obuf_ba;
size_t ilen, olen;
ibuf_ba = req->ioctl.ibuf;
ilen = req->ioctl.ilen;
obuf_ba = req->ioctl.obuf;
olen = req->ioctl.olen;
if (ibuf_ba)
dma_unmap_single(ipc_dev->dev, ibuf_ba, ilen, DMA_TO_DEVICE);
if (obuf_ba)
dma_unmap_single(ipc_dev->dev, obuf_ba, olen, DMA_FROM_DEVICE);
return 0;
}
/*
*
*/
int starlet_ioctl_prepare(struct starlet_ipc_request *req,
int fd, int request,
void *ibuf, size_t ilen,
void *obuf, size_t olen)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
dma_addr_t ibuf_ba, obuf_ba;
int error;
if (!ipc_dev)
return -ENODEV;
BUG_ON(!IS_ALIGNED((unsigned long)ibuf, STARLET_IPC_DMA_ALIGN+1));
BUG_ON(!IS_ALIGNED((unsigned long)obuf, STARLET_IPC_DMA_ALIGN+1));
ibuf_ba = (ibuf) ? dma_map_single(ipc_dev->dev, ibuf, ilen,
DMA_TO_DEVICE) : 0;
obuf_ba = (obuf) ? dma_map_single(ipc_dev->dev, obuf, olen,
DMA_FROM_DEVICE) : 0;
error = starlet_ioctl_dma_prepare(req, fd, request,
ibuf_ba, ilen, obuf_ba, olen);
if (!error) {
req->complete = starlet_ioctl_complete;
if (ibuf)
dma_unmap_single(ipc_dev->dev, ibuf_ba, ilen,
DMA_TO_DEVICE);
if (obuf)
dma_unmap_single(ipc_dev->dev, obuf_ba, olen,
DMA_FROM_DEVICE);
}
return error;
}
/**
*
*/
static int _starlet_ioctl(int fd, int request,
void *ibuf, size_t ilen,
void *obuf, size_t olen,
int poll, unsigned long usecs)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_ipc_request *req;
int error;
req = starlet_ipc_alloc_request(ipc_dev, GFP_ATOMIC);
if (!req)
return -ENOMEM;
error = starlet_ioctl_prepare(req, fd, request,
ibuf, ilen, obuf, olen);
if (!error)
error = (poll) ? starlet_ipc_call_polled(req, usecs) :
starlet_ipc_call(req);
starlet_ipc_free_request(req);
if (error < 0)
DBG("%s: error=%d (%x)\n", __func__, error, error);
return error;
}
int starlet_ioctl(int fd, int request,
void *ibuf, size_t ilen,
void *obuf, size_t olen)
{
return _starlet_ioctl(fd, request, ibuf, ilen, obuf, olen, 0, 0);
}
EXPORT_SYMBOL_GPL(starlet_ioctl);
int starlet_ioctl_polled(int fd, int request,
void *ibuf, size_t ilen,
void *obuf, size_t olen,
unsigned long usecs)
{
return _starlet_ioctl(fd, request, ibuf, ilen, obuf, olen, 1, usecs);
}
EXPORT_SYMBOL_GPL(starlet_ioctl_polled);
/**
*
*/
int starlet_ioctl_nowait(int fd, int request,
void *ibuf, size_t ilen,
void *obuf, size_t olen,
starlet_ipc_callback_t callback, void *arg)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_ipc_request *req;
int error;
req = starlet_ipc_alloc_request(ipc_dev, GFP_ATOMIC);
if (!req)
return -ENOMEM;
error = starlet_ioctl_prepare(req, fd, request,
ibuf, ilen, obuf, olen);
if (!error)
starlet_ipc_call_nowait(req, callback, arg);
else
starlet_ipc_free_request(req);
if (error)
DBG("%s: error=%d (%x)\n", __func__, error, error);
return error;
}
EXPORT_SYMBOL_GPL(starlet_ioctl_nowait);
static int starlet_ioctlv_complete(struct starlet_ipc_request *req)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_iovec *iovec = req->iovec;
dma_addr_t iovec_da = req->ioctlv.iovec_da;
size_t iovec_size = req->iovec_size;
#if 0
unsigned int nents;
DBG("%s: nents_in=%u, nents_io=%u\n", __func__,
req->sgl_nents_in, req->sgl_nents_io);
#endif
if (req->sgl_nents_in > 0)
dma_unmap_sg(ipc_dev->dev, req->sgl_in, req->sgl_nents_in,
DMA_TO_DEVICE);
if (req->sgl_nents_io > 0)
dma_unmap_sg(ipc_dev->dev, req->sgl_io, req->sgl_nents_io,
DMA_BIDIRECTIONAL);
if (iovec) {
dma_unmap_single(ipc_dev->dev,
iovec_da, iovec_size, DMA_TO_DEVICE);
#if 0
struct starlet_iovec *p;
p = iovec;
nents = req->sgl_nents_in;
while (nents--) {
DBG("%s: in: dma_addr=%p, dma_len=%u\n", __func__,
(void *)p->dma_addr, p->dma_len);
p++;
}
nents = req->sgl_nents_io;
while (nents--) {
DBG("%s: io: dma_addr=%p, dma_len=%u\n", __func__,
(void *)p->dma_addr, p->dma_len);
p++;
}
#endif
starlet_kfree(iovec);
}
return 0;
}
/*
*
*/
int starlet_ioctlv_prepare(struct starlet_ipc_request *req,
int fd, int request,
unsigned int nents_in,
struct scatterlist *sgl_in,
unsigned int nents_io,
struct scatterlist *sgl_io)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_iovec *iovec, *p;
dma_addr_t iovec_da = 0;
size_t iovec_size = 0;
struct scatterlist *sg;
unsigned int nents, i;
if (!ipc_dev)
return -ENODEV;
BUG_ON(nents_in > 0 && !sgl_in);
BUG_ON(nents_io > 0 && !sgl_io);
nents = nents_in + nents_io;
if (nents > 0) {
iovec_size = nents * sizeof(*iovec);
iovec = starlet_kzalloc(iovec_size, GFP_ATOMIC);
if (!iovec)
return -ENOMEM;
} else {
iovec = NULL;
}
p = iovec;
if (nents_in > 0) {
nents_in = dma_map_sg(ipc_dev->dev, sgl_in, nents_in,
DMA_TO_DEVICE);
for_each_sg(sgl_in, sg, nents_in, i) {
#if 0
DBG("%s: in: dma_addr=%p, dma_len=%u\n", __func__,
(void *)sg_dma_address(sg), sg_dma_len(sg));
#endif
p->dma_addr = sg_dma_address(sg);
p->dma_len = sg_dma_len(sg);
p++;
}
}
if (nents_io > 0) {
nents_io = dma_map_sg(ipc_dev->dev, sgl_io, nents_io,
DMA_BIDIRECTIONAL);
for_each_sg(sgl_io, sg, nents_io, i) {
#if 0
DBG("%s: io: dma_addr=%p, dma_len=%u\n", __func__,
(void *)sg_dma_address(sg), sg_dma_len(sg));
#endif
p->dma_addr = sg_dma_address(sg);
p->dma_len = sg_dma_len(sg);
p++;
}
}
if (iovec)
iovec_da = dma_map_single(ipc_dev->dev,
iovec, iovec_size,
DMA_TO_DEVICE);
req->iovec = iovec;
req->iovec_size = iovec_size;
req->sgl_nents_in = nents_in;
req->sgl_in = sgl_in;
req->sgl_nents_io = nents_io;
req->sgl_io = sgl_io;
req->cmd = STARLET_IOS_IOCTLV;
req->fd = fd;
req->ioctlv.request = request;
req->ioctlv.argc_in = nents_in;
req->ioctlv.argc_io = nents_io;
req->ioctlv.iovec_da = iovec_da;
req->complete = starlet_ioctlv_complete;
#if 0
DBG("%s: fd=%d, request=%d,"
" argc_in=%u, argc_io=%u, iovec_da=%08x\n" , __func__,
req->fd, req->ioctlv.request,
req->ioctlv.argc_in, req->ioctlv.argc_io,
req->ioctlv.iovec_da);
#endif
return 0;
}
/**
*
*/
static int _starlet_ioctlv(int fd, int request,
unsigned int nents_in,
struct scatterlist *sgl_in,
unsigned int nents_io,
struct scatterlist *sgl_io,
int poll, unsigned long usecs)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_ipc_request *req;
int error;
req = starlet_ipc_alloc_request(ipc_dev, GFP_ATOMIC);
if (!req)
return -ENOMEM;
error = starlet_ioctlv_prepare(req, fd, request,
nents_in, sgl_in,
nents_io, sgl_io);
if (!error)
error = (poll) ? starlet_ipc_call_polled(req, usecs) :
starlet_ipc_call(req);
starlet_ipc_free_request(req);
if (error < 0)
DBG("%s: error=%d (%x)\n", __func__, error, error);
return error;
}
int starlet_ioctlv(int fd, int request,
unsigned int nents_in,
struct scatterlist *sgl_in,
unsigned int nents_io,
struct scatterlist *sgl_io)
{
return _starlet_ioctlv(fd, request,
nents_in, sgl_in, nents_io, sgl_io, 0, 0);
}
EXPORT_SYMBOL_GPL(starlet_ioctlv);
int starlet_ioctlv_polled(int fd, int request,
unsigned int nents_in,
struct scatterlist *sgl_in,
unsigned int nents_io,
struct scatterlist *sgl_io,
unsigned long usecs)
{
return _starlet_ioctlv(fd, request,
nents_in, sgl_in, nents_io, sgl_io, 1, usecs);
}
EXPORT_SYMBOL_GPL(starlet_ioctlv_polled);
/**
*
*/
int starlet_ioctlv_nowait(int fd, int request,
unsigned int nents_in,
struct scatterlist *sgl_in,
unsigned int nents_io,
struct scatterlist *sgl_io,
starlet_ipc_callback_t callback, void *arg)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_ipc_request *req;
int error;
req = starlet_ipc_alloc_request(ipc_dev, GFP_ATOMIC);
if (!req)
return -ENOMEM;
error = starlet_ioctlv_prepare(req, fd, request,
nents_in, sgl_in,
nents_io, sgl_io);
if (!error)
starlet_ipc_call_nowait(req, callback, arg);
else
starlet_ipc_free_request(req);
if (error < 0)
DBG("%s: error=%d (%x)\n", __func__, error, error);
return error;
}
EXPORT_SYMBOL_GPL(starlet_ioctlv_nowait);
/**
*
*/
int starlet_ioctlv_and_reboot(int fd, int request,
unsigned int nents_in,
struct scatterlist *sgl_in,
unsigned int nents_io,
struct scatterlist *sgl_io)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_ipc_request *req;
int error;
req = starlet_ipc_alloc_request(ipc_dev, GFP_ATOMIC);
if (!req)
return -ENOMEM;
error = starlet_ioctlv_prepare(req, fd, request,
nents_in, sgl_in,
nents_io, sgl_io);
if (!error) {
ipc_dev->req = req;
set_bit(__REBOOT, &ipc_dev->flags);
error = starlet_ipc_call_polled(req, 10000000 /* usecs */);
}
starlet_ipc_free_request(req);
if (error < 0)
DBG("%s: error=%d (%x)\n", __func__, error, error);
return error;
}
EXPORT_SYMBOL_GPL(starlet_ioctlv_and_reboot);
/*
* starlet_ioh_ioctlv*
*
*/
static int starlet_ioh_ioctlv_complete(struct starlet_ipc_request *req)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_iovec *iovec = req->iovec;
dma_addr_t iovec_da = req->ioctlv.iovec_da;
size_t iovec_size = req->iovec_size;
#if 0
unsigned int nents;
DBG("%s: nents_in=%u, nents_io=%u\n", __func__,
req->sgl_nents_in, req->sgl_nents_io);
#endif
if (req->sgl_nents_in > 0)
starlet_ioh_dma_unmap_sg(ipc_dev->dev,
req->ioh_sgl_in, req->sgl_nents_in,
DMA_TO_DEVICE);
if (req->sgl_nents_io > 0)
starlet_ioh_dma_unmap_sg(ipc_dev->dev,
req->ioh_sgl_io, req->sgl_nents_io,
DMA_BIDIRECTIONAL);
if (iovec) {
dma_unmap_single(ipc_dev->dev,
iovec_da, iovec_size, DMA_TO_DEVICE);
{ /* begin debug */
#if 0
struct starlet_iovec *p;
p = iovec;
nents = req->sgl_nents_in;
while (nents--) {
DBG("%s: in: dma_addr=%p, dma_len=%u\n", __func__,
(void *)p->dma_addr, p->dma_len);
p++;
}
nents = req->sgl_nents_io;
while (nents--) {
DBG("%s: io: dma_addr=%p, dma_len=%u\n", __func__,
(void *)p->dma_addr, p->dma_len);
p++;
}
#endif
} /* end debug */
starlet_kfree(iovec);
}
return 0;
}
/*
*
*/
int starlet_ioh_ioctlv_prepare(struct starlet_ipc_request *req,
int fd, int request,
unsigned int nents_in,
struct starlet_ioh_sg *ioh_sgl_in,
unsigned int nents_io,
struct starlet_ioh_sg *ioh_sgl_io)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_iovec *iovec, *p;
dma_addr_t iovec_da = 0;
size_t iovec_size = 0;
struct starlet_ioh_sg *ioh_sg;
unsigned int nents, i;
if (!ipc_dev)
return -ENODEV;
BUG_ON(nents_in > 0 && !ioh_sgl_in);
BUG_ON(nents_io > 0 && !ioh_sgl_io);
nents = nents_in + nents_io;
if (nents > 0) {
iovec_size = nents * sizeof(*iovec);
iovec = starlet_kzalloc(iovec_size, GFP_ATOMIC);
if (!iovec)
return -ENOMEM;
} else {
iovec = NULL;
}
p = iovec;
if (nents_in > 0) {
nents_in = starlet_ioh_dma_map_sg(ipc_dev->dev,
ioh_sgl_in, nents_in,
DMA_TO_DEVICE);
starlet_ioh_for_each_sg(ioh_sgl_in, ioh_sg, nents_in, i) {
#if 0
DBG("%s: in: dma_addr=%p, dma_len=%u\n", __func__,
(void *)ioh_sg->dma_addr, ioh_sg->len);
#endif
p->dma_addr = ioh_sg->dma_addr;
p->dma_len = ioh_sg->len;
p++;
}
}
if (nents_io > 0) {
nents_io = starlet_ioh_dma_map_sg(ipc_dev->dev,
ioh_sgl_io, nents_io,
DMA_BIDIRECTIONAL);
starlet_ioh_for_each_sg(ioh_sgl_io, ioh_sg, nents_io, i) {
#if 0
DBG("%s: io: dma_addr=%p, dma_len=%u\n", __func__,
(void *)ioh_sg->dma_addr, ioh_sg->len);
#endif
p->dma_addr = ioh_sg->dma_addr;
p->dma_len = ioh_sg->len;
p++;
}
}
if (iovec)
iovec_da = dma_map_single(ipc_dev->dev,
iovec, iovec_size,
DMA_TO_DEVICE);
req->iovec = iovec;
req->iovec_size = iovec_size;
req->sgl_nents_in = nents_in;
req->ioh_sgl_in = ioh_sgl_in;
req->sgl_nents_io = nents_io;
req->ioh_sgl_io = ioh_sgl_io;
req->cmd = STARLET_IOS_IOCTLV;
req->fd = fd;
req->ioctlv.request = request;
req->ioctlv.argc_in = nents_in;
req->ioctlv.argc_io = nents_io;
req->ioctlv.iovec_da = iovec_da;
req->complete = starlet_ioh_ioctlv_complete;
return 0;
}
/**
*
*/
int starlet_ioh_ioctlv(int fd, int request,
unsigned int nents_in,
struct starlet_ioh_sg *ioh_sgl_in,
unsigned int nents_io,
struct starlet_ioh_sg *ioh_sgl_io)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_ipc_request *req;
int error;
req = starlet_ipc_alloc_request(ipc_dev, GFP_ATOMIC);
if (!req)
return -ENOMEM;
error = starlet_ioh_ioctlv_prepare(req, fd, request,
nents_in, ioh_sgl_in,
nents_io, ioh_sgl_io);
if (!error)
error = starlet_ipc_call(req);
starlet_ipc_free_request(req);
if (error < 0)
DBG("%s: error=%d (%x)\n", __func__, error, error);
return error;
}
EXPORT_SYMBOL_GPL(starlet_ioh_ioctlv);
/**
*
*/
int starlet_ioh_ioctlv_nowait(int fd, int request,
unsigned int nents_in,
struct starlet_ioh_sg *ioh_sgl_in,
unsigned int nents_io,
struct starlet_ioh_sg *ioh_sgl_io,
starlet_ipc_callback_t callback, void *arg)
{
struct starlet_ipc_device *ipc_dev = starlet_ipc_get_device();
struct starlet_ipc_request *req;
int error;
req = starlet_ipc_alloc_request(ipc_dev, GFP_ATOMIC);
if (!req)
return -ENOMEM;
error = starlet_ioh_ioctlv_prepare(req, fd, request,
nents_in, ioh_sgl_in,
nents_io, ioh_sgl_io);
if (!error)
starlet_ipc_call_nowait(req, callback, arg);
else
starlet_ipc_free_request(req);
if (error < 0)
DBG("%s: error=%d (%x)\n", __func__, error, error);
return error;
}
EXPORT_SYMBOL_GPL(starlet_ioh_ioctlv_nowait);
/*
* This "watchdog" code may be used to detect misbehaving requests.
*
* Note that some requests can take a lot of time to complete.
* For example, a keyboard event, which is delivered every time a key is
* pressed or released (or a keyboard is connected/disconnected), may take an
* arbitrary amount of time to arrive.
*
*/
#define STARLET_IPC_WATCHDOG_TIME (60 * HZ)
static void starlet_ipc_watchdog(unsigned long arg)
{
#if 0
struct starlet_ipc_device *ipc_dev = (struct starlet_ipc_device *)arg;
struct starlet_ipc_request *req;
unsigned long flags;
spin_lock_irqsave(&ipc_dev->list_lock, flags);
list_for_each_entry(req, &ipc_dev->outstanding_list, node) {
if (req &&
time_after(jiffies,
req->jiffies + STARLET_IPC_WATCHDOG_TIME)) {
drv_printk(KERN_INFO, "request on the outstanding"
" list for too long\n");
starlet_ipc_pretty_print_request(req);
}
}
spin_unlock_irqrestore(&ipc_dev->list_lock, flags);
mod_timer(&ipc_dev->timer, jiffies + STARLET_IPC_WATCHDOG_TIME);
#endif
}
/*
* Setup routines.
*
*/
/*
* Place here any desired hardware cleanups while drivers get written.
*/
static void starlet_fixups(void)
{
static u32 buf[8]
__attribute__ ((aligned(STARLET_IPC_DMA_ALIGN + 1)));
struct scatterlist in[6], io[1];
int fd;
void *gpio;
/* close any open file descriptors, just in case */
for (fd = 0; fd < 24; fd++)
starlet_close(fd);
/*
* Hey! We are super-green. And you?
*/
/* try to stop the dvd unit motor */
fd = starlet_open("/dev/di", 0);
if (fd >= 0) {
buf[0] = 0xe3000000; /* stop motor command */
buf[1] = 0;
buf[2] = 0;
starlet_ioctl(fd, buf[0],
buf, sizeof(buf),
buf, sizeof(buf));
starlet_close(fd);
}
/* try to disconnect the wiimote */
fd = starlet_open("/dev/usb/oh1/57e/305", 2);
if (fd >= 0) {
/*
* This assumes big endianness and 4 byte dma alignment.
*/
buf[0] = 0x20000000; /* bmRequestType 0x20 */
buf[1] = 0x00000000; /* bRequest 0x00 */
buf[2] = 0x00000000; /* wValue 0x00, 0x00 */
buf[3] = 0x00000000; /* wIndex 0x00, 0x00 */
buf[4] = 0x03000000; /* wLength 0x03, 0x00 */
buf[5] = 0x00000000; /* timeout? 0x00 */
buf[6] = 0x030c0000; /* payload 0x03, 0x0c, 0x00 */
sg_init_table(in, 6);
sg_set_buf(&in[0], &buf[0], 1);
sg_set_buf(&in[1], &buf[1], 1);
sg_set_buf(&in[2], &buf[2], 2);
sg_set_buf(&in[3], &buf[3], 2);
sg_set_buf(&in[4], &buf[4], 2);
sg_set_buf(&in[5], &buf[5], 1);
sg_init_table(io, 1);
sg_set_buf(&io[0], &buf[6], 3);
starlet_ioctlv(fd, 0, 6, in, 1, io);
starlet_close(fd);
}
/*
* Try to turn off the front led and sensor bar.
* (not strictly starlet-only stuff but anyway...)
*/
gpio = ioremap(0x0d8000c0, 4);
if (gpio) {
out_be32(gpio, in_be32(gpio) & ~0x120);
iounmap(gpio);
}
}
static int starlet_ipc_init(struct starlet_ipc_device *ipc_dev,
struct resource *mem, int irq)
{
size_t size, io_size;
int error;
ipc_dev->random_id = get_random_int();
error = starlet_malloc_lib_bootstrap(&mem[1]);
if (error)
return error;
io_size = mem[0].end - mem[0].start + 1;
ipc_dev->io_base = ioremap(mem[0].start, io_size);
ipc_dev->irq = irq;
size = max((size_t)64, sizeof(struct starlet_ipc_request));
ipc_dev->dma_pool = dma_pool_create(DRV_MODULE_NAME,
ipc_dev->dev,
size, STARLET_IPC_DMA_ALIGN + 1, 0);
if (!ipc_dev->dma_pool) {
drv_printk(KERN_ERR, "dma_pool_create failed\n");
iounmap(ipc_dev->io_base);
return -ENOMEM;
}
spin_lock_init(&ipc_dev->list_lock);
INIT_LIST_HEAD(&ipc_dev->pending_list);
INIT_LIST_HEAD(&ipc_dev->outstanding_list);
starlet_ipc_device_instance = ipc_dev;
init_timer(&ipc_dev->timer);
ipc_dev->timer.function = starlet_ipc_watchdog;
ipc_dev->timer.data = (unsigned long)ipc_dev;
ipc_dev->timer.expires = jiffies + STARLET_IPC_WATCHDOG_TIME;
add_timer(&ipc_dev->timer);
error = request_irq(ipc_dev->irq, starlet_ipc_handler, 0,
DRV_MODULE_NAME, ipc_dev);
if (error) {
drv_printk(KERN_ERR, "request of IRQ %d failed\n", irq);
starlet_ipc_device_instance = NULL;
dma_pool_destroy(ipc_dev->dma_pool);
iounmap(ipc_dev->io_base);
return error;
}
/* ack and enable RBFI and TBEI interrupts */
out_be32(ipc_dev->io_base + STARLET_IPC_CSR,
STARLET_IPC_CSR_TBEIMASK | STARLET_IPC_CSR_RBFIMASK |
STARLET_IPC_CSR_TBEI | STARLET_IPC_CSR_RBFI);
starlet_fixups();
return error;
}
static void starlet_ipc_exit(struct starlet_ipc_device *ipc_dev)
{
starlet_ipc_device_instance = NULL;
starlet_ipc_quiesce(ipc_dev);
del_timer(&ipc_dev->timer);
free_irq(ipc_dev->irq, ipc_dev);
dma_pool_destroy(ipc_dev->dma_pool);
iounmap(ipc_dev->io_base);
ipc_dev->io_base = NULL;
}
/*
* Driver model helper routines.
*
*/
static int starlet_ipc_do_probe(struct device *dev, struct resource *mem,
int irq)
{
struct starlet_ipc_device *ipc_dev;
int retval;
ipc_dev = kzalloc(sizeof(*ipc_dev), GFP_KERNEL);
if (!ipc_dev) {
drv_printk(KERN_ERR, "failed to allocate ipc_dev\n");
return -ENOMEM;
}
dev_set_drvdata(dev, ipc_dev);
ipc_dev->dev = dev;
retval = starlet_ipc_init(ipc_dev, mem, irq);
if (retval) {
dev_set_drvdata(dev, NULL);
kfree(ipc_dev);
}
return retval;
}
static int starlet_ipc_do_remove(struct device *dev)
{
struct starlet_ipc_device *ipc_dev = dev_get_drvdata(dev);
if (ipc_dev) {
starlet_ipc_exit(ipc_dev);
dev_set_drvdata(dev, NULL);
kfree(ipc_dev);
return 0;
}
return -ENODEV;
}
static int starlet_ipc_do_shutdown(struct device *dev)
{
struct starlet_ipc_device *ipc_dev = dev_get_drvdata(dev);
if (ipc_dev) {
/*
* We can't shutdown IPC as we need it to reboot the
* machine.
* Thus, no starlet_ipc_quiesce(ipc_dev); here, sorry.
*/
return 0;
}
return -ENODEV;
}
/*
* OF platform driver hooks.
*
*/
static int starlet_ipc_of_probe(struct of_device *odev,
const struct of_device_id *dev_id)
{
struct resource mem[2];
int error;
error = of_address_to_resource(odev->node, 0, &mem[0]);
if (error) {
drv_printk(KERN_ERR, "no io memory range found\n");
return -ENODEV;
}
error = of_address_to_resource(odev->node, 1, &mem[1]);
if (error) {
drv_printk(KERN_ERR, "missing ioh memory area (%d)\n", error);
return -ENODEV;
}
return starlet_ipc_do_probe(&odev->dev, mem,
irq_of_parse_and_map(odev->node, 0));
}
static int starlet_ipc_of_remove(struct of_device *odev)
{
return starlet_ipc_do_remove(&odev->dev);
}
static int starlet_ipc_of_shutdown(struct of_device *odev)
{
return starlet_ipc_do_shutdown(&odev->dev);
}
static struct of_device_id starlet_ipc_of_match[] = {
{ .compatible = "nintendo,starlet-ipc" },
{ },
};
MODULE_DEVICE_TABLE(of, starlet_ipc_of_match);
static struct of_platform_driver starlet_ipc_of_driver = {
.owner = THIS_MODULE,
.name = DRV_MODULE_NAME,
.match_table = starlet_ipc_of_match,
.probe = starlet_ipc_of_probe,
.remove = starlet_ipc_of_remove,
.shutdown = starlet_ipc_of_shutdown,
};
/*
* Kernel module interface hooks.
*
*/
static int __init starlet_ipc_init_module(void)
{
drv_printk(KERN_INFO, "%s - version %s\n", DRV_DESCRIPTION,
starlet_ipc_driver_version);
return of_register_platform_driver(&starlet_ipc_of_driver);
}
static void __exit starlet_ipc_exit_module(void)
{
of_unregister_platform_driver(&starlet_ipc_of_driver);
}
module_init(starlet_ipc_init_module);
module_exit(starlet_ipc_exit_module);
MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_AUTHOR(DRV_AUTHOR);
MODULE_LICENSE("GPL");