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/*
* linux/drivers/ide/cy82c693.c Version 0.34 Dec. 13, 1999
*
* Copyright (C) 1998-2000 Andreas S. Krebs (akrebs@altavista.net), Maintainer
* Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>, Integrater
*
* CYPRESS CY82C693 chipset IDE controller
*
* The CY82C693 chipset is used on Digital's PC-Alpha 164SX boards.
* Writting the driver was quite simple, since most of the job is
* done by the generic pci-ide support.
* The hard part was finding the CY82C693's datasheet on Cypress's
* web page :-(. But Altavista solved this problem :-).
*
*
* Notes:
* - I recently got a 16.8G IBM DTTA, so I was able to test it with
* a large and fast disk - the results look great, so I'd say the
* driver is working fine :-)
* hdparm -t reports 8.17 MB/sec at about 6% CPU usage for the DTTA
* - this is my first linux driver, so there's probably a lot of room
* for optimizations and bug fixing, so feel free to do it.
* - use idebus=xx parameter to set PCI bus speed - needed to calc
* timings for PIO modes (default will be 40)
* - if using PIO mode it's a good idea to set the PIO mode and
* 32-bit I/O support (if possible), e.g. hdparm -p2 -c1 /dev/hda
* - I had some problems with my IBM DHEA with PIO modes < 2
* (lost interrupts) ?????
* - first tests with DMA look okay, they seem to work, but there is a
* problem with sound - the BusMaster IDE TimeOut should fixed this
*
*
* History:
* AMH@1999-08-24: v0.34 init_cy82c693_chip moved to pci_init_cy82c693
* ASK@1999-01-23: v0.33 made a few minor code clean ups
* removed DMA clock speed setting by default
* added boot message
* ASK@1998-11-01: v0.32 added support to set BusMaster IDE TimeOut
* added support to set DMA Controller Clock Speed
* ASK@1998-10-31: v0.31 fixed problem with setting to high DMA modes on some drive
* ASK@1998-10-29: v0.3 added support to set DMA modes
* ASK@1998-10-28: v0.2 added support to set PIO modes
* ASK@1998-10-27: v0.1 first version - chipset detection
*
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <asm/io.h>
#include "ide_modes.h"
/* the current version */
#define CY82_VERSION "CY82C693U driver v0.34 99-13-12 Andreas S. Krebs (akrebs@altavista.net)"
/*
* The following are used to debug the driver.
*/
#define CY82C693_DEBUG_LOGS 0
#define CY82C693_DEBUG_INFO 0
/* define CY82C693_SETDMA_CLOCK to set DMA Controller Clock Speed to ATCLK */
#undef CY82C693_SETDMA_CLOCK
/*
* note: the value for busmaster timeout is tricky and i got it by trial and error !
* using a to low value will cause DMA timeouts and drop IDE performance
* using a to high value will cause audio playback to scatter
* if you know a better value or how to calc it, please let me know
*/
#define BUSMASTER_TIMEOUT 0x50 /* twice the value written in cy82c693ub datasheet */
/*
* the value above was tested on my machine and it seems to work okay
*/
/* here are the offset definitions for the registers */
#define CY82_IDE_CMDREG 0x04
#define CY82_IDE_ADDRSETUP 0x48
#define CY82_IDE_MASTER_IOR 0x4C
#define CY82_IDE_MASTER_IOW 0x4D
#define CY82_IDE_SLAVE_IOR 0x4E
#define CY82_IDE_SLAVE_IOW 0x4F
#define CY82_IDE_MASTER_8BIT 0x50
#define CY82_IDE_SLAVE_8BIT 0x51
#define CY82_INDEX_PORT 0x22
#define CY82_DATA_PORT 0x23
#define CY82_INDEX_CTRLREG1 0x01
#define CY82_INDEX_CHANNEL0 0x30
#define CY82_INDEX_CHANNEL1 0x31
#define CY82_INDEX_TIMEOUT 0x32
/* the max PIO mode - from datasheet */
#define CY82C693_MAX_PIO 4
/* the min and max PCI bus speed in MHz - from datasheet */
#define CY82C963_MIN_BUS_SPEED 25
#define CY82C963_MAX_BUS_SPEED 33
/* the struct for the PIO mode timings */
typedef struct pio_clocks_s {
byte address_time; /* Address setup (clocks) */
byte time_16r; /* clocks for 16bit IOR (0xF0=Active/data, 0x0F=Recovery) */
byte time_16w; /* clocks for 16bit IOW (0xF0=Active/data, 0x0F=Recovery) */
byte time_8; /* clocks for 8bit (0xF0=Active/data, 0x0F=Recovery) */
} pio_clocks_t;
/*
* calc clocks using bus_speed
* returns (rounded up) time in bus clocks for time in ns
*/
static int calc_clk (int time, int bus_speed)
{
int clocks;
clocks = (time*bus_speed+999)/1000 -1;
if (clocks < 0)
clocks = 0;
if (clocks > 0x0F)
clocks = 0x0F;
return clocks;
}
/*
* compute the values for the clock registers for PIO
* mode and pci_clk [MHz] speed
*
* NOTE: for mode 0,1 and 2 drives 8-bit IDE command control registers are used
* for mode 3 and 4 drives 8 and 16-bit timings are the same
*
*/
static void compute_clocks (byte pio, pio_clocks_t *p_pclk)
{
int clk1, clk2;
int bus_speed = system_bus_clock(); /* get speed of PCI bus */
/* we don't check against CY82C693's min and max speed,
* so you can play with the idebus=xx parameter
*/
if (pio > CY82C693_MAX_PIO)
pio = CY82C693_MAX_PIO;
/* let's calc the address setup time clocks */
p_pclk->address_time = (byte)calc_clk(ide_pio_timings[pio].setup_time, bus_speed);
/* let's calc the active and recovery time clocks */
clk1 = calc_clk(ide_pio_timings[pio].active_time, bus_speed);
/* calc recovery timing */
clk2 = ide_pio_timings[pio].cycle_time -
ide_pio_timings[pio].active_time -
ide_pio_timings[pio].setup_time;
clk2 = calc_clk(clk2, bus_speed);
clk1 = (clk1<<4)|clk2; /* combine active and recovery clocks */
/* note: we use the same values for 16bit IOR and IOW
* those are all the same, since I don't have other
* timings than those from ide_modes.h
*/
p_pclk->time_16r = (byte)clk1;
p_pclk->time_16w = (byte)clk1;
/* what are good values for 8bit ?? */
p_pclk->time_8 = (byte)clk1;
}
#ifdef CONFIG_BLK_DEV_IDEDMA
/*
* set DMA mode a specific channel for CY82C693
*/
static void cy82c693_dma_enable (ide_drive_t *drive, int mode, int single)
{
byte index;
byte data;
if (mode>2) /* make sure we set a valid mode */
mode = 2;
if (mode > drive->id->tDMA) /* to be absolutly sure we have a valid mode */
mode = drive->id->tDMA;
index = (HWIF(drive)->channel==0) ? CY82_INDEX_CHANNEL0 : CY82_INDEX_CHANNEL1;
#if CY82C693_DEBUG_LOGS
/* for debug let's show the previous values */
OUT_BYTE(index, CY82_INDEX_PORT);
data = IN_BYTE(CY82_DATA_PORT);
printk (KERN_INFO "%s (ch=%d, dev=%d): DMA mode is %d (single=%d)\n", drive->name, HWIF(drive)->channel, drive->select.b.unit, (data&0x3), ((data>>2)&1));
#endif /* CY82C693_DEBUG_LOGS */
data = (byte)mode|(byte)(single<<2);
OUT_BYTE(index, CY82_INDEX_PORT);
OUT_BYTE(data, CY82_DATA_PORT);
#if CY82C693_DEBUG_INFO
printk (KERN_INFO "%s (ch=%d, dev=%d): set DMA mode to %d (single=%d)\n", drive->name, HWIF(drive)->channel, drive->select.b.unit, mode, single);
#endif /* CY82C693_DEBUG_INFO */
/*
* note: below we set the value for Bus Master IDE TimeOut Register
* I'm not absolutly sure what this does, but it solved my problem
* with IDE DMA and sound, so I now can play sound and work with
* my IDE driver at the same time :-)
*
* If you know the correct (best) value for this register please
* let me know - ASK
*/
data = BUSMASTER_TIMEOUT;
OUT_BYTE(CY82_INDEX_TIMEOUT, CY82_INDEX_PORT);
OUT_BYTE(data, CY82_DATA_PORT);
#if CY82C693_DEBUG_INFO
printk (KERN_INFO "%s: Set IDE Bus Master TimeOut Register to 0x%X\n", drive->name, data);
#endif /* CY82C693_DEBUG_INFO */
}
/*
* used to set DMA mode for CY82C693 (single and multi modes)
*/
static int cy82c693_dmaproc(ide_dma_action_t func, ide_drive_t *drive)
{
/*
* if the function is dma on, set dma mode for drive everything
* else is done by the defaul func
*/
if (func == ide_dma_on) {
struct hd_driveid *id = drive->id;
#if CY82C693_DEBUG_INFO
printk (KERN_INFO "dma_on: %s\n", drive->name);
#endif /* CY82C693_DEBUG_INFO */
if (id != NULL) {
/* Enable DMA on any drive that has DMA (multi or single) enabled */
if (id->field_valid & 2) { /* regular DMA */
int mmode, smode;
mmode = id->dma_mword & (id->dma_mword >> 8);
smode = id->dma_1word & (id->dma_1word >> 8);
if (mmode != 0)
cy82c693_dma_enable(drive, (mmode >> 1), 0); /* enable multi */
else if (smode != 0)
cy82c693_dma_enable(drive, (smode >> 1), 1); /* enable single */
}
}
}
return ide_dmaproc(func, drive);
}
#endif /* CONFIG_BLK_DEV_IDEDMA */
/*
* tune ide drive - set PIO mode
*/
static void cy82c693_tune_drive (ide_drive_t *drive, byte pio)
{
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = hwif->pci_dev;
pio_clocks_t pclk;
unsigned int addrCtrl;
/* select primary or secondary channel */
if (hwif->index > 0) { /* drive is on the secondary channel */
dev = pci_find_slot(dev->bus->number, dev->devfn+1);
if (!dev) {
printk(KERN_ERR "%s: tune_drive: Cannot find secondary interface!\n", drive->name);
return;
}
}
#if CY82C693_DEBUG_LOGS
/* for debug let's show the register values */
if (drive->select.b.unit == 0) {
/*
* get master drive registers
* address setup control register
* is 32 bit !!!
*/
pci_read_config_dword(dev, CY82_IDE_ADDRSETUP, &addrCtrl);
addrCtrl &= 0x0F;
/* now let's get the remaining registers */
pci_read_config_byte(dev, CY82_IDE_MASTER_IOR, &pclk.time_16r);
pci_read_config_byte(dev, CY82_IDE_MASTER_IOW, &pclk.time_16w);
pci_read_config_byte(dev, CY82_IDE_MASTER_8BIT, &pclk.time_8);
} else {
/*
* set slave drive registers
* address setup control register
* is 32 bit !!!
*/
pci_read_config_dword(dev, CY82_IDE_ADDRSETUP, &addrCtrl);
addrCtrl &= 0xF0;
addrCtrl >>= 4;
/* now let's get the remaining registers */
pci_read_config_byte(dev, CY82_IDE_SLAVE_IOR, &pclk.time_16r);
pci_read_config_byte(dev, CY82_IDE_SLAVE_IOW, &pclk.time_16w);
pci_read_config_byte(dev, CY82_IDE_SLAVE_8BIT, &pclk.time_8);
}
printk (KERN_INFO "%s (ch=%d, dev=%d): PIO timing is (addr=0x%X, ior=0x%X, iow=0x%X, 8bit=0x%X)\n", drive->name, hwif->channel, drive->select.b.unit, addrCtrl, pclk.time_16r, pclk.time_16w, pclk.time_8);
#endif /* CY82C693_DEBUG_LOGS */
/* first let's calc the pio modes */
pio = ide_get_best_pio_mode(drive, pio, CY82C693_MAX_PIO, NULL);
#if CY82C693_DEBUG_INFO
printk (KERN_INFO "%s: Selected PIO mode %d\n", drive->name, pio);
#endif /* CY82C693_DEBUG_INFO */
compute_clocks(pio, &pclk); /* let's calc the values for this PIO mode */
/* now let's write the clocks registers */
if (drive->select.b.unit == 0) {
/*
* set master drive
* address setup control register
* is 32 bit !!!
*/
pci_read_config_dword(dev, CY82_IDE_ADDRSETUP, &addrCtrl);
addrCtrl &= (~0xF);
addrCtrl |= (unsigned int)pclk.address_time;
pci_write_config_dword(dev, CY82_IDE_ADDRSETUP, addrCtrl);
/* now let's set the remaining registers */
pci_write_config_byte(dev, CY82_IDE_MASTER_IOR, pclk.time_16r);
pci_write_config_byte(dev, CY82_IDE_MASTER_IOW, pclk.time_16w);
pci_write_config_byte(dev, CY82_IDE_MASTER_8BIT, pclk.time_8);
addrCtrl &= 0xF;
} else {
/*
* set slave drive
* address setup control register
* is 32 bit !!!
*/
pci_read_config_dword(dev, CY82_IDE_ADDRSETUP, &addrCtrl);
addrCtrl &= (~0xF0);
addrCtrl |= ((unsigned int)pclk.address_time<<4);
pci_write_config_dword(dev, CY82_IDE_ADDRSETUP, addrCtrl);
/* now let's set the remaining registers */
pci_write_config_byte(dev, CY82_IDE_SLAVE_IOR, pclk.time_16r);
pci_write_config_byte(dev, CY82_IDE_SLAVE_IOW, pclk.time_16w);
pci_write_config_byte(dev, CY82_IDE_SLAVE_8BIT, pclk.time_8);
addrCtrl >>= 4;
addrCtrl &= 0xF;
}
#if CY82C693_DEBUG_INFO
printk (KERN_INFO "%s (ch=%d, dev=%d): set PIO timing to (addr=0x%X, ior=0x%X, iow=0x%X, 8bit=0x%X)\n", drive->name, hwif->channel, drive->select.b.unit, addrCtrl, pclk.time_16r, pclk.time_16w, pclk.time_8);
#endif /* CY82C693_DEBUG_INFO */
}
/*
* this function is called during init and is used to setup the cy82c693 chip
*/
/*
* FIXME! "pci_init_cy82c693" really should replace
* the "init_cy82c693_chip", it is the correct location to tinker/setup
* the device prior to INIT.
*/
unsigned int __init pci_init_cy82c693(struct pci_dev *dev, const char *name)
{
#ifdef CY82C693_SETDMA_CLOCK
byte data;
#endif /* CY82C693_SETDMA_CLOCK */
/* write info about this verion of the driver */
printk (KERN_INFO CY82_VERSION "\n");
#ifdef CY82C693_SETDMA_CLOCK
/* okay let's set the DMA clock speed */
OUT_BYTE(CY82_INDEX_CTRLREG1, CY82_INDEX_PORT);
data = IN_BYTE(CY82_DATA_PORT);
#if CY82C693_DEBUG_INFO
printk (KERN_INFO "%s: Peripheral Configuration Register: 0x%X\n", name, data);
#endif /* CY82C693_DEBUG_INFO */
/*
* for some reason sometimes the DMA controller
* speed is set to ATCLK/2 ???? - we fix this here
*
* note: i don't know what causes this strange behaviour,
* but even changing the dma speed doesn't solve it :-(
* the ide performance is still only half the normal speed
*
* if anybody knows what goes wrong with my machine, please
* let me know - ASK
*/
data |= 0x03;
OUT_BYTE(CY82_INDEX_CTRLREG1, CY82_INDEX_PORT);
OUT_BYTE(data, CY82_DATA_PORT);
#if CY82C693_DEBUG_INFO
printk (KERN_INFO "%s: New Peripheral Configuration Register: 0x%X\n", name, data);
#endif /* CY82C693_DEBUG_INFO */
#endif /* CY82C693_SETDMA_CLOCK */
return 0;
}
/*
* the init function - called for each ide channel once
*/
void __init ide_init_cy82c693(ide_hwif_t *hwif)
{
hwif->chipset = ide_cy82c693;
hwif->tuneproc = &cy82c693_tune_drive;
hwif->drives[0].autotune = 1;
hwif->drives[1].autotune = 1;
hwif->autodma = 0;
#ifdef CONFIG_BLK_DEV_IDEDMA
if (hwif->dma_base) {
hwif->dmaproc = &cy82c693_dmaproc;
if (!noautodma)
hwif->autodma = 1;
}
#endif /* CONFIG_BLK_DEV_IDEDMA */
}
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