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android_kernel_xiaomi_sm8350/drivers/net/macsonic.c
Russell King 09c6518ca0 [DRIVER MODEL] Fix macsonic 
Release code in driver modules is a potential cause of oopsen.
The device may be in use by a userspace process, which will keep
a reference to the device.  If the module is unloaded, the module
text will be freed.  Subsequently, when the last reference is
dropped, the release code will be called, which no longer exists.

Use generic platform device allocation/release code in modules.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-11-05 21:21:10 +00:00

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/*
* macsonic.c
*
* (C) 2005 Finn Thain
*
* Converted to DMA API, converted to unified driver model, made it work as
* a module again, and from the mac68k project, introduced more 32-bit cards
* and dhd's support for 16-bit cards.
*
* (C) 1998 Alan Cox
*
* Debugging Andreas Ehliar, Michael Schmitz
*
* Based on code
* (C) 1996 by Thomas Bogendoerfer (tsbogend@bigbug.franken.de)
*
* This driver is based on work from Andreas Busse, but most of
* the code is rewritten.
*
* (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
*
* A driver for the Mac onboard Sonic ethernet chip.
*
* 98/12/21 MSch: judged from tests on Q800, it's basically working,
* but eating up both receive and transmit resources
* and duplicating packets. Needs more testing.
*
* 99/01/03 MSch: upgraded to version 0.92 of the core driver, fixed.
*
* 00/10/31 sammy@oh.verio.com: Updated driver for 2.4 kernels, fixed problems
* on centris.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/nubus.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <asm/bootinfo.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/hwtest.h>
#include <asm/dma.h>
#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_via.h>
static char mac_sonic_string[] = "macsonic";
static struct platform_device *mac_sonic_device;
#include "sonic.h"
/* These should basically be bus-size and endian independent (since
the SONIC is at least smart enough that it uses the same endianness
as the host, unlike certain less enlightened Macintosh NICs) */
#define SONIC_READ(reg) (nubus_readw(dev->base_addr + (reg * 4) \
+ lp->reg_offset))
#define SONIC_WRITE(reg,val) (nubus_writew(val, dev->base_addr + (reg * 4) \
+ lp->reg_offset))
/* use 0 for production, 1 for verification, >1 for debug */
#ifdef SONIC_DEBUG
static unsigned int sonic_debug = SONIC_DEBUG;
#else
static unsigned int sonic_debug = 1;
#endif
static int sonic_version_printed;
extern int mac_onboard_sonic_probe(struct net_device* dev);
extern int mac_nubus_sonic_probe(struct net_device* dev);
/* For onboard SONIC */
#define ONBOARD_SONIC_REGISTERS 0x50F0A000
#define ONBOARD_SONIC_PROM_BASE 0x50f08000
enum macsonic_type {
MACSONIC_DUODOCK,
MACSONIC_APPLE,
MACSONIC_APPLE16,
MACSONIC_DAYNA,
MACSONIC_DAYNALINK
};
/* For the built-in SONIC in the Duo Dock */
#define DUODOCK_SONIC_REGISTERS 0xe10000
#define DUODOCK_SONIC_PROM_BASE 0xe12000
/* For Apple-style NuBus SONIC */
#define APPLE_SONIC_REGISTERS 0
#define APPLE_SONIC_PROM_BASE 0x40000
/* Daynalink LC SONIC */
#define DAYNALINK_PROM_BASE 0x400000
/* For Dayna-style NuBus SONIC (haven't seen one yet) */
#define DAYNA_SONIC_REGISTERS 0x180000
/* This is what OpenBSD says. However, this is definitely in NuBus
ROM space so we should be able to get it by walking the NuBus
resource directories */
#define DAYNA_SONIC_MAC_ADDR 0xffe004
#define SONIC_READ_PROM(addr) nubus_readb(prom_addr+addr)
/*
* For reversing the PROM address
*/
static unsigned char nibbletab[] = {0, 8, 4, 12, 2, 10, 6, 14,
1, 9, 5, 13, 3, 11, 7, 15};
static inline void bit_reverse_addr(unsigned char addr[6])
{
int i;
for(i = 0; i < 6; i++)
addr[i] = ((nibbletab[addr[i] & 0xf] << 4) |
nibbletab[(addr[i] >> 4) &0xf]);
}
int __init macsonic_init(struct net_device* dev)
{
struct sonic_local* lp = netdev_priv(dev);
/* Allocate the entire chunk of memory for the descriptors.
Note that this cannot cross a 64K boundary. */
if ((lp->descriptors = dma_alloc_coherent(lp->device,
SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
&lp->descriptors_laddr, GFP_KERNEL)) == NULL) {
printk(KERN_ERR "%s: couldn't alloc DMA memory for descriptors.\n", lp->device->bus_id);
return -ENOMEM;
}
/* Now set up the pointers to point to the appropriate places */
lp->cda = lp->descriptors;
lp->tda = lp->cda + (SIZEOF_SONIC_CDA
* SONIC_BUS_SCALE(lp->dma_bitmode));
lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
* SONIC_BUS_SCALE(lp->dma_bitmode));
lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
* SONIC_BUS_SCALE(lp->dma_bitmode));
lp->cda_laddr = lp->descriptors_laddr;
lp->tda_laddr = lp->cda_laddr + (SIZEOF_SONIC_CDA
* SONIC_BUS_SCALE(lp->dma_bitmode));
lp->rda_laddr = lp->tda_laddr + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
* SONIC_BUS_SCALE(lp->dma_bitmode));
lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
* SONIC_BUS_SCALE(lp->dma_bitmode));
dev->open = sonic_open;
dev->stop = sonic_close;
dev->hard_start_xmit = sonic_send_packet;
dev->get_stats = sonic_get_stats;
dev->set_multicast_list = &sonic_multicast_list;
dev->tx_timeout = sonic_tx_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
/*
* clear tally counter
*/
SONIC_WRITE(SONIC_CRCT, 0xffff);
SONIC_WRITE(SONIC_FAET, 0xffff);
SONIC_WRITE(SONIC_MPT, 0xffff);
return 0;
}
int __init mac_onboard_sonic_ethernet_addr(struct net_device* dev)
{
struct sonic_local *lp = netdev_priv(dev);
const int prom_addr = ONBOARD_SONIC_PROM_BASE;
int i;
/* On NuBus boards we can sometimes look in the ROM resources.
No such luck for comm-slot/onboard. */
for(i = 0; i < 6; i++)
dev->dev_addr[i] = SONIC_READ_PROM(i);
/* Most of the time, the address is bit-reversed. The NetBSD
source has a rather long and detailed historical account of
why this is so. */
if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
memcmp(dev->dev_addr, "\x00\x80\x19", 3) &&
memcmp(dev->dev_addr, "\x00\x05\x02", 3))
bit_reverse_addr(dev->dev_addr);
else
return 0;
/* If we still have what seems to be a bogus address, we'll
look in the CAM. The top entry should be ours. */
/* Danger! This only works if MacOS has already initialized
the card... */
if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
memcmp(dev->dev_addr, "\x00\x80\x19", 3) &&
memcmp(dev->dev_addr, "\x00\x05\x02", 3))
{
unsigned short val;
printk(KERN_INFO "macsonic: PROM seems to be wrong, trying CAM entry 15\n");
SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
SONIC_WRITE(SONIC_CEP, 15);
val = SONIC_READ(SONIC_CAP2);
dev->dev_addr[5] = val >> 8;
dev->dev_addr[4] = val & 0xff;
val = SONIC_READ(SONIC_CAP1);
dev->dev_addr[3] = val >> 8;
dev->dev_addr[2] = val & 0xff;
val = SONIC_READ(SONIC_CAP0);
dev->dev_addr[1] = val >> 8;
dev->dev_addr[0] = val & 0xff;
printk(KERN_INFO "HW Address from CAM 15: ");
for (i = 0; i < 6; i++) {
printk("%2.2x", dev->dev_addr[i]);
if (i < 5)
printk(":");
}
printk("\n");
} else return 0;
if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
memcmp(dev->dev_addr, "\x00\x80\x19", 3) &&
memcmp(dev->dev_addr, "\x00\x05\x02", 3))
{
/*
* Still nonsense ... messed up someplace!
*/
printk(KERN_ERR "macsonic: ERROR (INVALID MAC)\n");
return -EIO;
} else return 0;
}
int __init mac_onboard_sonic_probe(struct net_device* dev)
{
/* Bwahahaha */
static int once_is_more_than_enough;
struct sonic_local* lp = netdev_priv(dev);
int sr;
int commslot = 0;
if (once_is_more_than_enough)
return -ENODEV;
once_is_more_than_enough = 1;
if (!MACH_IS_MAC)
return -ENODEV;
if (macintosh_config->ether_type != MAC_ETHER_SONIC)
return -ENODEV;
printk(KERN_INFO "Checking for internal Macintosh ethernet (SONIC).. ");
/* Bogus probing, on the models which may or may not have
Ethernet (BTW, the Ethernet *is* always at the same
address, and nothing else lives there, at least if Apple's
documentation is to be believed) */
if (macintosh_config->ident == MAC_MODEL_Q630 ||
macintosh_config->ident == MAC_MODEL_P588 ||
macintosh_config->ident == MAC_MODEL_P575 ||
macintosh_config->ident == MAC_MODEL_C610) {
unsigned long flags;
int card_present;
local_irq_save(flags);
card_present = hwreg_present((void*)ONBOARD_SONIC_REGISTERS);
local_irq_restore(flags);
if (!card_present) {
printk("none.\n");
return -ENODEV;
}
commslot = 1;
}
printk("yes\n");
/* Danger! My arms are flailing wildly! You *must* set lp->reg_offset
* and dev->base_addr before using SONIC_READ() or SONIC_WRITE() */
dev->base_addr = ONBOARD_SONIC_REGISTERS;
if (via_alt_mapping)
dev->irq = IRQ_AUTO_3;
else
dev->irq = IRQ_NUBUS_9;
if (!sonic_version_printed) {
printk(KERN_INFO "%s", version);
sonic_version_printed = 1;
}
printk(KERN_INFO "%s: onboard / comm-slot SONIC at 0x%08lx\n",
lp->device->bus_id, dev->base_addr);
/* The PowerBook's SONIC is 16 bit always. */
if (macintosh_config->ident == MAC_MODEL_PB520) {
lp->reg_offset = 0;
lp->dma_bitmode = SONIC_BITMODE16;
sr = SONIC_READ(SONIC_SR);
} else if (commslot) {
/* Some of the comm-slot cards are 16 bit. But some
of them are not. The 32-bit cards use offset 2 and
have known revisions, we try reading the revision
register at offset 2, if we don't get a known revision
we assume 16 bit at offset 0. */
lp->reg_offset = 2;
lp->dma_bitmode = SONIC_BITMODE16;
sr = SONIC_READ(SONIC_SR);
if (sr == 0x0004 || sr == 0x0006 || sr == 0x0100 || sr == 0x0101)
/* 83932 is 0x0004 or 0x0006, 83934 is 0x0100 or 0x0101 */
lp->dma_bitmode = SONIC_BITMODE32;
else {
lp->dma_bitmode = SONIC_BITMODE16;
lp->reg_offset = 0;
sr = SONIC_READ(SONIC_SR);
}
} else {
/* All onboard cards are at offset 2 with 32 bit DMA. */
lp->reg_offset = 2;
lp->dma_bitmode = SONIC_BITMODE32;
sr = SONIC_READ(SONIC_SR);
}
printk(KERN_INFO
"%s: revision 0x%04x, using %d bit DMA and register offset %d\n",
lp->device->bus_id, sr, lp->dma_bitmode?32:16, lp->reg_offset);
#if 0 /* This is sometimes useful to find out how MacOS configured the card. */
printk(KERN_INFO "%s: DCR: 0x%04x, DCR2: 0x%04x\n", lp->device->bus_id,
SONIC_READ(SONIC_DCR) & 0xffff, SONIC_READ(SONIC_DCR2) & 0xffff);
#endif
/* Software reset, then initialize control registers. */
SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
SONIC_WRITE(SONIC_DCR, SONIC_DCR_EXBUS | SONIC_DCR_BMS |
SONIC_DCR_RFT1 | SONIC_DCR_TFT0 |
(lp->dma_bitmode ? SONIC_DCR_DW : 0));
/* This *must* be written back to in order to restore the
* extended programmable output bits, as it may not have been
* initialised since the hardware reset. */
SONIC_WRITE(SONIC_DCR2, 0);
/* Clear *and* disable interrupts to be on the safe side */
SONIC_WRITE(SONIC_IMR, 0);
SONIC_WRITE(SONIC_ISR, 0x7fff);
/* Now look for the MAC address. */
if (mac_onboard_sonic_ethernet_addr(dev) != 0)
return -ENODEV;
/* Shared init code */
return macsonic_init(dev);
}
int __init mac_nubus_sonic_ethernet_addr(struct net_device* dev,
unsigned long prom_addr,
int id)
{
int i;
for(i = 0; i < 6; i++)
dev->dev_addr[i] = SONIC_READ_PROM(i);
/* Some of the addresses are bit-reversed */
if (id != MACSONIC_DAYNA)
bit_reverse_addr(dev->dev_addr);
return 0;
}
int __init macsonic_ident(struct nubus_dev* ndev)
{
if (ndev->dr_hw == NUBUS_DRHW_ASANTE_LC &&
ndev->dr_sw == NUBUS_DRSW_SONIC_LC)
return MACSONIC_DAYNALINK;
if (ndev->dr_hw == NUBUS_DRHW_SONIC &&
ndev->dr_sw == NUBUS_DRSW_APPLE) {
/* There has to be a better way to do this... */
if (strstr(ndev->board->name, "DuoDock"))
return MACSONIC_DUODOCK;
else
return MACSONIC_APPLE;
}
if (ndev->dr_hw == NUBUS_DRHW_SMC9194 &&
ndev->dr_sw == NUBUS_DRSW_DAYNA)
return MACSONIC_DAYNA;
if (ndev->dr_hw == NUBUS_DRHW_SONIC_LC &&
ndev->dr_sw == 0) { /* huh? */
return MACSONIC_APPLE16;
}
return -1;
}
int __init mac_nubus_sonic_probe(struct net_device* dev)
{
static int slots;
struct nubus_dev* ndev = NULL;
struct sonic_local* lp = netdev_priv(dev);
unsigned long base_addr, prom_addr;
u16 sonic_dcr;
int id = -1;
int reg_offset, dma_bitmode;
/* Find the first SONIC that hasn't been initialized already */
while ((ndev = nubus_find_type(NUBUS_CAT_NETWORK,
NUBUS_TYPE_ETHERNET, ndev)) != NULL)
{
/* Have we seen it already? */
if (slots & (1<<ndev->board->slot))
continue;
slots |= 1<<ndev->board->slot;
/* Is it one of ours? */
if ((id = macsonic_ident(ndev)) != -1)
break;
}
if (ndev == NULL)
return -ENODEV;
switch (id) {
case MACSONIC_DUODOCK:
base_addr = ndev->board->slot_addr + DUODOCK_SONIC_REGISTERS;
prom_addr = ndev->board->slot_addr + DUODOCK_SONIC_PROM_BASE;
sonic_dcr = SONIC_DCR_EXBUS | SONIC_DCR_RFT0 | SONIC_DCR_RFT1 |
SONIC_DCR_TFT0;
reg_offset = 2;
dma_bitmode = SONIC_BITMODE32;
break;
case MACSONIC_APPLE:
base_addr = ndev->board->slot_addr + APPLE_SONIC_REGISTERS;
prom_addr = ndev->board->slot_addr + APPLE_SONIC_PROM_BASE;
sonic_dcr = SONIC_DCR_BMS | SONIC_DCR_RFT1 | SONIC_DCR_TFT0;
reg_offset = 0;
dma_bitmode = SONIC_BITMODE32;
break;
case MACSONIC_APPLE16:
base_addr = ndev->board->slot_addr + APPLE_SONIC_REGISTERS;
prom_addr = ndev->board->slot_addr + APPLE_SONIC_PROM_BASE;
sonic_dcr = SONIC_DCR_EXBUS | SONIC_DCR_RFT1 | SONIC_DCR_TFT0 |
SONIC_DCR_PO1 | SONIC_DCR_BMS;
reg_offset = 0;
dma_bitmode = SONIC_BITMODE16;
break;
case MACSONIC_DAYNALINK:
base_addr = ndev->board->slot_addr + APPLE_SONIC_REGISTERS;
prom_addr = ndev->board->slot_addr + DAYNALINK_PROM_BASE;
sonic_dcr = SONIC_DCR_RFT1 | SONIC_DCR_TFT0 |
SONIC_DCR_PO1 | SONIC_DCR_BMS;
reg_offset = 0;
dma_bitmode = SONIC_BITMODE16;
break;
case MACSONIC_DAYNA:
base_addr = ndev->board->slot_addr + DAYNA_SONIC_REGISTERS;
prom_addr = ndev->board->slot_addr + DAYNA_SONIC_MAC_ADDR;
sonic_dcr = SONIC_DCR_BMS |
SONIC_DCR_RFT1 | SONIC_DCR_TFT0 | SONIC_DCR_PO1;
reg_offset = 0;
dma_bitmode = SONIC_BITMODE16;
break;
default:
printk(KERN_ERR "macsonic: WTF, id is %d\n", id);
return -ENODEV;
}
/* Danger! My arms are flailing wildly! You *must* set lp->reg_offset
* and dev->base_addr before using SONIC_READ() or SONIC_WRITE() */
dev->base_addr = base_addr;
lp->reg_offset = reg_offset;
lp->dma_bitmode = dma_bitmode;
dev->irq = SLOT2IRQ(ndev->board->slot);
if (!sonic_version_printed) {
printk(KERN_INFO "%s", version);
sonic_version_printed = 1;
}
printk(KERN_INFO "%s: %s in slot %X\n",
lp->device->bus_id, ndev->board->name, ndev->board->slot);
printk(KERN_INFO "%s: revision 0x%04x, using %d bit DMA and register offset %d\n",
lp->device->bus_id, SONIC_READ(SONIC_SR), dma_bitmode?32:16, reg_offset);
#if 0 /* This is sometimes useful to find out how MacOS configured the card. */
printk(KERN_INFO "%s: DCR: 0x%04x, DCR2: 0x%04x\n", lp->device->bus_id,
SONIC_READ(SONIC_DCR) & 0xffff, SONIC_READ(SONIC_DCR2) & 0xffff);
#endif
/* Software reset, then initialize control registers. */
SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
SONIC_WRITE(SONIC_DCR, sonic_dcr | (dma_bitmode ? SONIC_DCR_DW : 0));
/* This *must* be written back to in order to restore the
* extended programmable output bits, since it may not have been
* initialised since the hardware reset. */
SONIC_WRITE(SONIC_DCR2, 0);
/* Clear *and* disable interrupts to be on the safe side */
SONIC_WRITE(SONIC_IMR, 0);
SONIC_WRITE(SONIC_ISR, 0x7fff);
/* Now look for the MAC address. */
if (mac_nubus_sonic_ethernet_addr(dev, prom_addr, id) != 0)
return -ENODEV;
/* Shared init code */
return macsonic_init(dev);
}
static int __init mac_sonic_probe(struct device *device)
{
struct net_device *dev;
struct sonic_local *lp;
int err;
int i;
dev = alloc_etherdev(sizeof(struct sonic_local));
if (!dev)
return -ENOMEM;
lp = netdev_priv(dev);
lp->device = device;
SET_NETDEV_DEV(dev, device);
SET_MODULE_OWNER(dev);
/* This will catch fatal stuff like -ENOMEM as well as success */
err = mac_onboard_sonic_probe(dev);
if (err == 0)
goto found;
if (err != -ENODEV)
goto out;
err = mac_nubus_sonic_probe(dev);
if (err)
goto out;
found:
err = register_netdev(dev);
if (err)
goto out;
printk("%s: MAC ", dev->name);
for (i = 0; i < 6; i++) {
printk("%2.2x", dev->dev_addr[i]);
if (i < 5)
printk(":");
}
printk(" IRQ %d\n", dev->irq);
return 0;
out:
free_netdev(dev);
return err;
}
MODULE_DESCRIPTION("Macintosh SONIC ethernet driver");
module_param(sonic_debug, int, 0);
MODULE_PARM_DESC(sonic_debug, "macsonic debug level (1-4)");
#define SONIC_IRQ_FLAG IRQ_FLG_FAST
#include "sonic.c"
static int __devexit mac_sonic_device_remove (struct device *device)
{
struct net_device *dev = device->driver_data;
struct sonic_local* lp = netdev_priv(dev);
unregister_netdev (dev);
dma_free_coherent(lp->device, SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
lp->descriptors, lp->descriptors_laddr);
free_netdev (dev);
return 0;
}
static struct device_driver mac_sonic_driver = {
.name = mac_sonic_string,
.bus = &platform_bus_type,
.probe = mac_sonic_probe,
.remove = __devexit_p(mac_sonic_device_remove),
};
static int __init mac_sonic_init_module(void)
{
int err;
if ((err = driver_register(&mac_sonic_driver))) {
printk(KERN_ERR "Driver registration failed\n");
return err;
}
mac_sonic_device = platform_device_alloc(mac_sonic_string, 0);
if (!mac_sonic_device) {
goto out_unregister;
}
if (platform_device_add(mac_sonic_device)) {
platform_device_put(mac_sonic_device);
mac_sonic_device = NULL;
}
return 0;
out_unregister:
driver_unregister(&mac_sonic_driver);
return -ENOMEM;
}
static void __exit mac_sonic_cleanup_module(void)
{
driver_unregister(&mac_sonic_driver);
if (mac_sonic_device) {
platform_device_unregister(mac_sonic_device);
mac_sonic_device = NULL;
}
}
module_init(mac_sonic_init_module);
module_exit(mac_sonic_cleanup_module);
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