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linux-next/drivers/ide/alim15x3.c
Hannes Eder 95964018d5 alim15x3: fix sparse warning 
Fix this sparse warning:

  drivers/ide/alim15x3.c:594:2: warning: returning void-valued expression

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2008-12-02 20:40:04 +01:00

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/*
* Copyright (C) 1998-2000 Michel Aubry, Maintainer
* Copyright (C) 1998-2000 Andrzej Krzysztofowicz, Maintainer
* Copyright (C) 1999-2000 CJ, cjtsai@ali.com.tw, Maintainer
*
* Copyright (C) 1998-2000 Andre Hedrick (andre@linux-ide.org)
* May be copied or modified under the terms of the GNU General Public License
* Copyright (C) 2002 Alan Cox
* ALi (now ULi M5228) support by Clear Zhang <Clear.Zhang@ali.com.tw>
* Copyright (C) 2007 MontaVista Software, Inc. <source@mvista.com>
* Copyright (C) 2007 Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
*
* (U)DMA capable version of ali 1533/1543(C), 1535(D)
*
**********************************************************************
* 9/7/99 --Parts from the above author are included and need to be
* converted into standard interface, once I finish the thought.
*
* Recent changes
* Don't use LBA48 mode on ALi <= 0xC4
* Don't poke 0x79 with a non ALi northbridge
* Don't flip undefined bits on newer chipsets (fix Fujitsu laptop hang)
* Allow UDMA6 on revisions > 0xC4
*
* Documentation
* Chipset documentation available under NDA only
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <linux/dmi.h>
#include <asm/io.h>
#define DRV_NAME "alim15x3"
/*
* Allow UDMA on M1543C-E chipset for WDC disks that ignore CRC checking
* (this is DANGEROUS and could result in data corruption).
*/
static int wdc_udma;
module_param(wdc_udma, bool, 0);
MODULE_PARM_DESC(wdc_udma,
"allow UDMA on M1543C-E chipset for WDC disks (DANGEROUS)");
/*
* ALi devices are not plug in. Otherwise these static values would
* need to go. They ought to go away anyway
*/
static u8 m5229_revision;
static u8 chip_is_1543c_e;
static struct pci_dev *isa_dev;
/**
* ali_set_pio_mode - set host controller for PIO mode
* @drive: drive
* @pio: PIO mode number
*
* Program the controller for the given PIO mode.
*/
static void ali_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = to_pci_dev(hwif->dev);
struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
int s_time = t->setup, a_time = t->active, c_time = t->cycle;
u8 s_clc, a_clc, r_clc;
unsigned long flags;
int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
int port = hwif->channel ? 0x5c : 0x58;
int portFIFO = hwif->channel ? 0x55 : 0x54;
u8 cd_dma_fifo = 0, unit = drive->dn & 1;
if ((s_clc = (s_time * bus_speed + 999) / 1000) >= 8)
s_clc = 0;
if ((a_clc = (a_time * bus_speed + 999) / 1000) >= 8)
a_clc = 0;
if (!(r_clc = (c_time * bus_speed + 999) / 1000 - a_clc - s_clc)) {
r_clc = 1;
} else {
if (r_clc >= 16)
r_clc = 0;
}
local_irq_save(flags);
/*
* PIO mode => ATA FIFO on, ATAPI FIFO off
*/
pci_read_config_byte(dev, portFIFO, &cd_dma_fifo);
if (drive->media==ide_disk) {
if (unit) {
pci_write_config_byte(dev, portFIFO, (cd_dma_fifo & 0x0F) | 0x50);
} else {
pci_write_config_byte(dev, portFIFO, (cd_dma_fifo & 0xF0) | 0x05);
}
} else {
if (unit) {
pci_write_config_byte(dev, portFIFO, cd_dma_fifo & 0x0F);
} else {
pci_write_config_byte(dev, portFIFO, cd_dma_fifo & 0xF0);
}
}
pci_write_config_byte(dev, port, s_clc);
pci_write_config_byte(dev, port + unit + 2, (a_clc << 4) | r_clc);
local_irq_restore(flags);
}
/**
* ali_udma_filter - compute UDMA mask
* @drive: IDE device
*
* Return available UDMA modes.
*
* The actual rules for the ALi are:
* No UDMA on revisions <= 0x20
* Disk only for revisions < 0xC2
* Not WDC drives on M1543C-E (?)
*/
static u8 ali_udma_filter(ide_drive_t *drive)
{
if (m5229_revision > 0x20 && m5229_revision < 0xC2) {
if (drive->media != ide_disk)
return 0;
if (wdc_udma == 0 && chip_is_1543c_e &&
strstr((char *)&drive->id[ATA_ID_PROD], "WDC "))
return 0;
}
return drive->hwif->ultra_mask;
}
/**
* ali_set_dma_mode - set host controller for DMA mode
* @drive: drive
* @speed: DMA mode
*
* Configure the hardware for the desired IDE transfer mode.
*/
static void ali_set_dma_mode(ide_drive_t *drive, const u8 speed)
{
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = to_pci_dev(hwif->dev);
u8 speed1 = speed;
u8 unit = drive->dn & 1;
u8 tmpbyte = 0x00;
int m5229_udma = (hwif->channel) ? 0x57 : 0x56;
if (speed == XFER_UDMA_6)
speed1 = 0x47;
if (speed < XFER_UDMA_0) {
u8 ultra_enable = (unit) ? 0x7f : 0xf7;
/*
* clear "ultra enable" bit
*/
pci_read_config_byte(dev, m5229_udma, &tmpbyte);
tmpbyte &= ultra_enable;
pci_write_config_byte(dev, m5229_udma, tmpbyte);
/*
* FIXME: Oh, my... DMA timings are never set.
*/
} else {
pci_read_config_byte(dev, m5229_udma, &tmpbyte);
tmpbyte &= (0x0f << ((1-unit) << 2));
/*
* enable ultra dma and set timing
*/
tmpbyte |= ((0x08 | ((4-speed1)&0x07)) << (unit << 2));
pci_write_config_byte(dev, m5229_udma, tmpbyte);
if (speed >= XFER_UDMA_3) {
pci_read_config_byte(dev, 0x4b, &tmpbyte);
tmpbyte |= 1;
pci_write_config_byte(dev, 0x4b, tmpbyte);
}
}
}
/**
* ali15x3_dma_setup - begin a DMA phase
* @drive: target device
*
* Returns 1 if the DMA cannot be performed, zero on success.
*/
static int ali15x3_dma_setup(ide_drive_t *drive)
{
if (m5229_revision < 0xC2 && drive->media != ide_disk) {
if (rq_data_dir(drive->hwif->hwgroup->rq))
return 1; /* try PIO instead of DMA */
}
return ide_dma_setup(drive);
}
/**
* init_chipset_ali15x3 - Initialise an ALi IDE controller
* @dev: PCI device
*
* This function initializes the ALI IDE controller and where
* appropriate also sets up the 1533 southbridge.
*/
static unsigned int init_chipset_ali15x3(struct pci_dev *dev)
{
unsigned long flags;
u8 tmpbyte;
struct pci_dev *north = pci_get_slot(dev->bus, PCI_DEVFN(0,0));
m5229_revision = dev->revision;
isa_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
local_irq_save(flags);
if (m5229_revision < 0xC2) {
/*
* revision 0x20 (1543-E, 1543-F)
* revision 0xC0, 0xC1 (1543C-C, 1543C-D, 1543C-E)
* clear CD-ROM DMA write bit, m5229, 0x4b, bit 7
*/
pci_read_config_byte(dev, 0x4b, &tmpbyte);
/*
* clear bit 7
*/
pci_write_config_byte(dev, 0x4b, tmpbyte & 0x7F);
/*
* check m1533, 0x5e, bit 1~4 == 1001 => & 00011110 = 00010010
*/
if (m5229_revision >= 0x20 && isa_dev) {
pci_read_config_byte(isa_dev, 0x5e, &tmpbyte);
chip_is_1543c_e = ((tmpbyte & 0x1e) == 0x12) ? 1: 0;
}
goto out;
}
/*
* 1543C-B?, 1535, 1535D, 1553
* Note 1: not all "motherboard" support this detection
* Note 2: if no udma 66 device, the detection may "error".
* but in this case, we will not set the device to
* ultra 66, the detection result is not important
*/
/*
* enable "Cable Detection", m5229, 0x4b, bit3
*/
pci_read_config_byte(dev, 0x4b, &tmpbyte);
pci_write_config_byte(dev, 0x4b, tmpbyte | 0x08);
/*
* We should only tune the 1533 enable if we are using an ALi
* North bridge. We might have no north found on some zany
* box without a device at 0:0.0. The ALi bridge will be at
* 0:0.0 so if we didn't find one we know what is cooking.
*/
if (north && north->vendor != PCI_VENDOR_ID_AL)
goto out;
if (m5229_revision < 0xC5 && isa_dev)
{
/*
* set south-bridge's enable bit, m1533, 0x79
*/
pci_read_config_byte(isa_dev, 0x79, &tmpbyte);
if (m5229_revision == 0xC2) {
/*
* 1543C-B0 (m1533, 0x79, bit 2)
*/
pci_write_config_byte(isa_dev, 0x79, tmpbyte | 0x04);
} else if (m5229_revision >= 0xC3) {
/*
* 1553/1535 (m1533, 0x79, bit 1)
*/
pci_write_config_byte(isa_dev, 0x79, tmpbyte | 0x02);
}
}
out:
/*
* CD_ROM DMA on (m5229, 0x53, bit0)
* Enable this bit even if we want to use PIO.
* PIO FIFO off (m5229, 0x53, bit1)
* The hardware will use 0x54h and 0x55h to control PIO FIFO.
* (Not on later devices it seems)
*
* 0x53 changes meaning on later revs - we must no touch
* bit 1 on them. Need to check if 0x20 is the right break.
*/
if (m5229_revision >= 0x20) {
pci_read_config_byte(dev, 0x53, &tmpbyte);
if (m5229_revision <= 0x20)
tmpbyte = (tmpbyte & (~0x02)) | 0x01;
else if (m5229_revision == 0xc7 || m5229_revision == 0xc8)
tmpbyte |= 0x03;
else
tmpbyte |= 0x01;
pci_write_config_byte(dev, 0x53, tmpbyte);
}
pci_dev_put(north);
pci_dev_put(isa_dev);
local_irq_restore(flags);
return 0;
}
/*
* Cable special cases
*/
static const struct dmi_system_id cable_dmi_table[] = {
{
.ident = "HP Pavilion N5430",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
},
},
{
.ident = "Toshiba Satellite S1800-814",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "S1800-814"),
},
},
{ }
};
static int ali_cable_override(struct pci_dev *pdev)
{
/* Fujitsu P2000 */
if (pdev->subsystem_vendor == 0x10CF &&
pdev->subsystem_device == 0x10AF)
return 1;
/* Mitac 8317 (Winbook-A) and relatives */
if (pdev->subsystem_vendor == 0x1071 &&
pdev->subsystem_device == 0x8317)
return 1;
/* Systems by DMI */
if (dmi_check_system(cable_dmi_table))
return 1;
return 0;
}
/**
* ali_cable_detect - cable detection
* @hwif: IDE interface
*
* This checks if the controller and the cable are capable
* of UDMA66 transfers. It doesn't check the drives.
* But see note 2 below!
*
* FIXME: frobs bits that are not defined on newer ALi devicea
*/
static u8 ali_cable_detect(ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
unsigned long flags;
u8 cbl = ATA_CBL_PATA40, tmpbyte;
local_irq_save(flags);
if (m5229_revision >= 0xC2) {
/*
* m5229 80-pin cable detection (from Host View)
*
* 0x4a bit0 is 0 => primary channel has 80-pin
* 0x4a bit1 is 0 => secondary channel has 80-pin
*
* Certain laptops use short but suitable cables
* and don't implement the detect logic.
*/
if (ali_cable_override(dev))
cbl = ATA_CBL_PATA40_SHORT;
else {
pci_read_config_byte(dev, 0x4a, &tmpbyte);
if ((tmpbyte & (1 << hwif->channel)) == 0)
cbl = ATA_CBL_PATA80;
}
}
local_irq_restore(flags);
return cbl;
}
#if !defined(CONFIG_SPARC64) && !defined(CONFIG_PPC)
/**
* init_hwif_ali15x3 - Initialize the ALI IDE x86 stuff
* @hwif: interface to configure
*
* Obtain the IRQ tables for an ALi based IDE solution on the PC
* class platforms. This part of the code isn't applicable to the
* Sparc and PowerPC systems.
*/
static void __devinit init_hwif_ali15x3 (ide_hwif_t *hwif)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
u8 ideic, inmir;
s8 irq_routing_table[] = { -1, 9, 3, 10, 4, 5, 7, 6,
1, 11, 0, 12, 0, 14, 0, 15 };
int irq = -1;
if (dev->device == PCI_DEVICE_ID_AL_M5229)
hwif->irq = hwif->channel ? 15 : 14;
if (isa_dev) {
/*
* read IDE interface control
*/
pci_read_config_byte(isa_dev, 0x58, &ideic);
/* bit0, bit1 */
ideic = ideic & 0x03;
/* get IRQ for IDE Controller */
if ((hwif->channel && ideic == 0x03) ||
(!hwif->channel && !ideic)) {
/*
* get SIRQ1 routing table
*/
pci_read_config_byte(isa_dev, 0x44, &inmir);
inmir = inmir & 0x0f;
irq = irq_routing_table[inmir];
} else if (hwif->channel && !(ideic & 0x01)) {
/*
* get SIRQ2 routing table
*/
pci_read_config_byte(isa_dev, 0x75, &inmir);
inmir = inmir & 0x0f;
irq = irq_routing_table[inmir];
}
if(irq >= 0)
hwif->irq = irq;
}
}
#else
#define init_hwif_ali15x3 NULL
#endif /* !defined(CONFIG_SPARC64) && !defined(CONFIG_PPC) */
/**
* init_dma_ali15x3 - set up DMA on ALi15x3
* @hwif: IDE interface
* @d: IDE port info
*
* Set up the DMA functionality on the ALi 15x3.
*/
static int __devinit init_dma_ali15x3(ide_hwif_t *hwif,
const struct ide_port_info *d)
{
struct pci_dev *dev = to_pci_dev(hwif->dev);
unsigned long base = ide_pci_dma_base(hwif, d);
if (base == 0)
return -1;
hwif->dma_base = base;
if (ide_pci_check_simplex(hwif, d) < 0)
return -1;
if (ide_pci_set_master(dev, d->name) < 0)
return -1;
if (!hwif->channel)
outb(inb(base + 2) & 0x60, base + 2);
printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx\n",
hwif->name, base, base + 7);
if (ide_allocate_dma_engine(hwif))
return -1;
hwif->dma_ops = &sff_dma_ops;
return 0;
}
static const struct ide_port_ops ali_port_ops = {
.set_pio_mode = ali_set_pio_mode,
.set_dma_mode = ali_set_dma_mode,
.udma_filter = ali_udma_filter,
.cable_detect = ali_cable_detect,
};
static const struct ide_dma_ops ali_dma_ops = {
.dma_host_set = ide_dma_host_set,
.dma_setup = ali15x3_dma_setup,
.dma_exec_cmd = ide_dma_exec_cmd,
.dma_start = ide_dma_start,
.dma_end = ide_dma_end,
.dma_test_irq = ide_dma_test_irq,
.dma_lost_irq = ide_dma_lost_irq,
.dma_timeout = ide_dma_timeout,
};
static const struct ide_port_info ali15x3_chipset __devinitdata = {
.name = DRV_NAME,
.init_chipset = init_chipset_ali15x3,
.init_hwif = init_hwif_ali15x3,
.init_dma = init_dma_ali15x3,
.port_ops = &ali_port_ops,
.pio_mask = ATA_PIO5,
.swdma_mask = ATA_SWDMA2,
.mwdma_mask = ATA_MWDMA2,
};
/**
* alim15x3_init_one - set up an ALi15x3 IDE controller
* @dev: PCI device to set up
*
* Perform the actual set up for an ALi15x3 that has been found by the
* hot plug layer.
*/
static int __devinit alim15x3_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
struct ide_port_info d = ali15x3_chipset;
u8 rev = dev->revision, idx = id->driver_data;
/* don't use LBA48 DMA on ALi devices before rev 0xC5 */
if (rev <= 0xC4)
d.host_flags |= IDE_HFLAG_NO_LBA48_DMA;
if (rev >= 0x20) {
if (rev == 0x20)
d.host_flags |= IDE_HFLAG_NO_ATAPI_DMA;
if (rev < 0xC2)
d.udma_mask = ATA_UDMA2;
else if (rev == 0xC2 || rev == 0xC3)
d.udma_mask = ATA_UDMA4;
else if (rev == 0xC4)
d.udma_mask = ATA_UDMA5;
else
d.udma_mask = ATA_UDMA6;
d.dma_ops = &ali_dma_ops;
} else {
d.host_flags |= IDE_HFLAG_NO_DMA;
d.mwdma_mask = d.swdma_mask = 0;
}
if (idx == 0)
d.host_flags |= IDE_HFLAG_CLEAR_SIMPLEX;
return ide_pci_init_one(dev, &d, NULL);
}
static const struct pci_device_id alim15x3_pci_tbl[] = {
{ PCI_VDEVICE(AL, PCI_DEVICE_ID_AL_M5229), 0 },
{ PCI_VDEVICE(AL, PCI_DEVICE_ID_AL_M5228), 1 },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, alim15x3_pci_tbl);
static struct pci_driver alim15x3_pci_driver = {
.name = "ALI15x3_IDE",
.id_table = alim15x3_pci_tbl,
.probe = alim15x3_init_one,
.remove = ide_pci_remove,
.suspend = ide_pci_suspend,
.resume = ide_pci_resume,
};
static int __init ali15x3_ide_init(void)
{
return ide_pci_register_driver(&alim15x3_pci_driver);
}
static void __exit ali15x3_ide_exit(void)
{
pci_unregister_driver(&alim15x3_pci_driver);
}
module_init(ali15x3_ide_init);
module_exit(ali15x3_ide_exit);
MODULE_AUTHOR("Michael Aubry, Andrzej Krzysztofowicz, CJ, Andre Hedrick, Alan Cox");
MODULE_DESCRIPTION("PCI driver module for ALi 15x3 IDE");
MODULE_LICENSE("GPL");
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