patch-2.3.1 linux/drivers/block/cy82c693.c
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- Lines: 432
- Date:
Thu May 13 11:04:54 1999
- Orig file:
v2.3.0/linux/drivers/block/cy82c693.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.3.0/linux/drivers/block/cy82c693.c linux/drivers/block/cy82c693.c
@@ -0,0 +1,431 @@
+/*
+ * linux/drivers/block/cy82c693.c Version 0.33 Jan. 23, 1999
+ *
+ * Copyright (C) 1998, 1999 Andreas S. Krebs (akrebs@altavista.net), Maintainer
+ * Copyright (C) 1998 Andre Hedrick, 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 fell 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:
+ * 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/types.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/ide.h>
+
+#include <asm/io.h>
+
+#include "ide_modes.h"
+
+/* the current version */
+#define CY82_VERSION "CY82C693U driver v0.33 99-01-23 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;
+
+ bus_speed = ide_system_bus_speed(); /* 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;
+}
+
+/*
+ * 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);
+}
+
+/*
+ * 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 = dev->next;
+
+#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
+ */
+static void init_cy82c693_chip (struct pci_dev *dev)
+{
+ static int initDone = 0;
+#ifdef CY82C693_SETDMA_CLOCK
+ byte data;
+#endif /* CY82C693_SETDMA_CLOCK */
+
+ if (initDone != 0) /* only perform setup once */
+ return;
+ initDone = 1;
+
+ /* 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 "CY82U693: Peripheral Configuration Register: 0x%X\n", 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 "CY82U693: New Peripheral Configuration Register: 0x%X\n", data);
+#endif /* CY82C693_DEBUG_INFO */
+
+#endif /* CY82C693_SETDMA_CLOCK */
+}
+
+/*
+ * the init function - called for each ide channel once
+ */
+__initfunc(void ide_init_cy82c693(ide_hwif_t *hwif))
+{
+ hwif->chipset = ide_cy82c693;
+ hwif->dmaproc = &cy82c693_dmaproc;
+ hwif->tuneproc = &cy82c693_tune_drive;
+
+ init_cy82c693_chip(hwif->pci_dev);
+}
+
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