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minix/drivers/at_wini/at_wini.c
David van Moolenbroek 6d466f941b at_wini: PCI-only now; one controller per instance 
- remove non-PCI support, since all supported platforms with at_wini
  devices also have PCI support by now;
- correspondingly, stop using information from the BIOS altogether;
- limit each driver instance to one controller, to be in line with
  the general MINIX3 one-instance-per-controller driver model; this
  limits the number of disks per at_wini instance to four;
- go through the controllers by the order of their occurrence in the
  PCI table, thus removing the exception for compatibility devices;
- let the second at_wini instance shut down silently if there is only
  one IDE controller;
- clean up some extra code we don't need anymore, and resolve some
  WARNS=5 level warnings.

Overall, these changes should simplify automatic loading of the right
disk drivers at boot time in the future.

Change-Id: Ia64d08cfbeb9916abd68c9c2941baeb87d02a806
2014-03-01 09:04:57 +01:00

2244 lines
62 KiB
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/* This file contains the device dependent part of a driver for the IBM-AT
* winchester controller. Written by Adri Koppes.
*
* Changes:
* Oct 2, 2013 drop non-PCI support; one controller per instance (David)
* Aug 19, 2005 ATA PCI support, supports SATA (Ben Gras)
* Nov 18, 2004 moved AT disk driver to user-space (Jorrit N. Herder)
* Aug 20, 2004 watchdogs replaced by sync alarms (Jorrit N. Herder)
* Mar 23, 2000 added ATAPI CDROM support (Michael Temari)
* May 14, 2000 d-d/i rewrite (Kees J. Bot)
* Apr 13, 1992 device dependent/independent split (Kees J. Bot)
*/
#include "at_wini.h"
#include <minix/sysutil.h>
#include <minix/type.h>
#include <minix/endpoint.h>
#include <sys/ioc_disk.h>
#include <machine/pci.h>
#include <sys/mman.h>
#include <sys/svrctl.h>
/* Variables. */
/* Common command block */
struct command {
u8_t precomp; /* REG_PRECOMP, etc. */
u8_t count;
u8_t sector;
u8_t cyl_lo;
u8_t cyl_hi;
u8_t ldh;
u8_t command;
/* The following at for LBA48 */
u8_t count_prev;
u8_t sector_prev;
u8_t cyl_lo_prev;
u8_t cyl_hi_prev;
};
/* Timeouts and max retries. */
static int timeout_usecs = DEF_TIMEOUT_USECS;
static int max_errors = MAX_ERRORS;
static long w_standard_timeouts = 0;
static long w_pci_debug = 0;
static long w_instance = 0;
static long disable_dma = 0;
static long atapi_debug = 0;
static long w_identify_wakeup_ticks;
static long wakeup_ticks;
static long w_atapi_dma;
static int w_testing = 0;
static int w_silent = 0;
static u32_t system_hz;
/* The struct wini is indexed by drive (0-3). */
static struct wini { /* main drive struct, one entry per drive */
unsigned state; /* drive state: deaf, initialized, dead */
unsigned short w_status; /* device status register */
unsigned base_cmd; /* command base register */
unsigned base_ctl; /* control base register */
unsigned base_dma; /* dma base register */
unsigned char native; /* if set, drive is native (not compat.) */
unsigned char lba48; /* if set, drive supports lba48 */
unsigned char dma; /* if set, drive supports dma */
unsigned char dma_intseen; /* if set, drive has seen an interrupt */
int irq_hook_id; /* id of irq hook at the kernel */
unsigned cylinders; /* physical number of cylinders */
unsigned heads; /* physical number of heads */
unsigned sectors; /* physical number of sectors per track */
unsigned ldhpref; /* top four bytes of the LDH (head) register */
unsigned max_count; /* max request for this drive */
unsigned open_ct; /* in-use count */
struct device part[DEV_PER_DRIVE]; /* disks and partitions */
struct device subpart[SUB_PER_DRIVE]; /* subpartitions */
} wini[MAX_DRIVES], *w_wn;
static int w_device = -1;
int w_command; /* current command in execution */
static int w_drive; /* selected drive */
static struct device *w_dv; /* device's base and size */
static u8_t *tmp_buf;
#define ATA_DMA_SECTORS 64
#define ATA_DMA_BUF_SIZE (ATA_DMA_SECTORS*SECTOR_SIZE)
static char *dma_buf;
static phys_bytes dma_buf_phys;
#define N_PRDTE 1024 /* Should be enough for large requests */
struct prdte
{
phys_bytes prdte_base;
u16_t prdte_count;
u8_t prdte_reserved;
u8_t prdte_flags;
};
#define PRDT_BYTES (sizeof(struct prdte) * N_PRDTE)
static struct prdte *prdt;
static phys_bytes prdt_phys;
#define PRDTE_FL_EOT 0x80 /* End of table */
static int w_probe(int skip, u16_t *vidp, u16_t *didp);
static void w_init(int devind, u16_t vid, u16_t did);
static int init_params(void);
static int w_do_open(devminor_t minor, int access);
static struct device *w_prepare(devminor_t dev);
static struct device *w_part(devminor_t minor);
static int w_identify(void);
static char *w_name(void);
static int w_specify(void);
static int w_io_test(void);
static ssize_t w_transfer(devminor_t minor, int do_write, u64_t position,
endpoint_t proc_nr, iovec_t *iov, unsigned int nr_req, int flags);
static int com_out(struct command *cmd);
static int com_out_ext(struct command *cmd);
static int setup_dma(unsigned *sizep, endpoint_t proc_nr, iovec_t *iov,
size_t addr_offset, int do_write);
static void w_need_reset(void);
static int w_do_close(devminor_t minor);
static int w_ioctl(devminor_t minor, unsigned long request, endpoint_t endpt,
cp_grant_id_t grant, endpoint_t user_endpt);
static void w_hw_int(unsigned int irqs);
static int com_simple(struct command *cmd);
static void w_timeout(void);
static int w_reset(void);
static void w_intr_wait(void);
static int at_intr_wait(void);
static int w_waitfor(int mask, int value);
static int w_waitfor_dma(unsigned int mask, unsigned int value);
static void w_geometry(devminor_t minor, struct part_geom *entry);
static int atapi_sendpacket(u8_t *packet, unsigned cnt, int do_dma);
static int atapi_intr_wait(int dma, size_t max);
static int atapi_open(void);
static void atapi_close(void);
static int atapi_transfer(int do_write, u64_t position, endpoint_t
endpt, iovec_t *iov, unsigned int nr_req);
/* Entry points to this driver. */
static struct blockdriver w_dtab = {
.bdr_type = BLOCKDRIVER_TYPE_DISK, /* handle partition requests */
.bdr_open = w_do_open, /* open or mount request, initialize device */
.bdr_close = w_do_close, /* release device */
.bdr_transfer = w_transfer, /* do the I/O */
.bdr_ioctl = w_ioctl, /* I/O control requests */
.bdr_part = w_part, /* return partition information */
.bdr_geometry = w_geometry, /* tell the geometry of the disk */
.bdr_intr = w_hw_int, /* leftover hardware interrupts */
};
/* SEF functions and variables. */
static void sef_local_startup(void);
static int sef_cb_init_fresh(int type, sef_init_info_t *info);
/*===========================================================================*
* at_winchester_task *
*===========================================================================*/
int main(int argc, char *argv[])
{
/* SEF local startup. */
env_setargs(argc, argv);
sef_local_startup();
/* Call the generic receive loop. */
blockdriver_task(&w_dtab);
return(OK);
}
/*===========================================================================*
* sef_local_startup *
*===========================================================================*/
static void sef_local_startup(void)
{
/* Register init callbacks. */
sef_setcb_init_fresh(sef_cb_init_fresh);
sef_setcb_init_lu(sef_cb_init_fresh);
/* Register live update callbacks. */
sef_setcb_lu_prepare(sef_cb_lu_prepare);
sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid);
sef_setcb_lu_state_dump(sef_cb_lu_state_dump);
/* Let SEF perform startup. */
sef_startup();
}
/*===========================================================================*
* sef_cb_init_fresh *
*===========================================================================*/
static int sef_cb_init_fresh(int type, sef_init_info_t *UNUSED(info))
{
/* Initialize the at_wini driver. */
int skip, devind;
u16_t vid, did;
system_hz = sys_hz();
if (!(tmp_buf = alloc_contig(2*DMA_BUF_SIZE, AC_ALIGN4K, NULL)))
panic("unable to allocate temporary buffer");
w_identify_wakeup_ticks = WAKEUP_TICKS;
wakeup_ticks = WAKEUP_TICKS;
/* Set special disk parameters. */
skip = init_params();
/* Find the PCI device to use. If none found, terminate immediately. */
devind = w_probe(skip, &vid, &did);
if (devind < 0) {
/* For now, complain only if even the first at_wini instance cannot
* find a device. There may be only one IDE controller after all,
* but if there are none, the system should probably be booted with
* another driver, and that's something the user might want to know.
*/
if (w_instance == 0)
panic("no matching device found");
return ENODEV; /* the actual error code doesn't matter */
}
/* Initialize the device. */
w_init(devind, vid, did);
/* Announce we are up! */
blockdriver_announce(type);
return(OK);
}
/*===========================================================================*
* init_params *
*===========================================================================*/
static int init_params(void)
{
/* This routine is called at startup to initialize the drive parameters. */
int drive;
long wakeup_secs = WAKEUP_SECS;
/* Boot variables. */
env_parse("instance", "d", 0, &w_instance, 0, 8);
env_parse("ata_std_timeout", "d", 0, &w_standard_timeouts, 0, 1);
env_parse("ata_pci_debug", "d", 0, &w_pci_debug, 0, 1);
env_parse(NO_DMA_VAR, "d", 0, &disable_dma, 0, 1);
env_parse("ata_id_timeout", "d", 0, &wakeup_secs, 1, 60);
env_parse("atapi_debug", "d", 0, &atapi_debug, 0, 1);
env_parse("atapi_dma", "d", 0, &w_atapi_dma, 0, 1);
w_identify_wakeup_ticks = wakeup_secs * system_hz;
if(atapi_debug)
panic("atapi_debug");
if(w_identify_wakeup_ticks <= 0) {
printf("changing wakeup from %ld to %d ticks.\n",
w_identify_wakeup_ticks, WAKEUP_TICKS);
w_identify_wakeup_ticks = WAKEUP_TICKS;
}
if (disable_dma) {
printf("at_wini%ld: DMA for ATA devices is disabled.\n", w_instance);
} else {
/* Ask for anonymous memory for DMA, that is physically contiguous. */
dma_buf = alloc_contig(ATA_DMA_BUF_SIZE, 0, &dma_buf_phys);
prdt = alloc_contig(PRDT_BYTES, 0, &prdt_phys);
if(!dma_buf || !prdt) {
disable_dma = 1;
printf("at_wini%ld: no dma\n", w_instance);
}
}
for (drive = 0; drive < MAX_DRIVES; drive++)
wini[drive].state = IGNORING;
return (int) w_instance;
}
/*===========================================================================*
* init_drive *
*===========================================================================*/
static void init_drive(int drive, int base_cmd, int base_ctl, int base_dma,
int native, int hook)
{
struct wini *w;
w = &wini[drive];
w->state = 0;
w->w_status = 0;
w->base_cmd = base_cmd;
w->base_ctl = base_ctl;
w->base_dma = base_dma;
if (w_pci_debug)
printf("at_wini%ld: drive %d: base_cmd 0x%x, base_ctl 0x%x, "
"base_dma 0x%x\n", w_instance, drive, w->base_cmd, w->base_ctl,
w->base_dma);
w->native = native;
w->irq_hook_id = hook;
w->ldhpref = ldh_init(drive);
w->max_count = MAX_SECS << SECTOR_SHIFT;
w->lba48 = 0;
w->dma = 0;
}
/*===========================================================================*
* w_probe *
*===========================================================================*/
static int w_probe(int skip, u16_t *vidp, u16_t *didp)
{
/* Go through the PCI devices that have been made visible to us, skipping as
* many as requested and then reserving the first one after that. We assume
* that all visible devices are in fact devices we can handle.
*/
int r, devind;
pci_init();
r = pci_first_dev(&devind, vidp, didp);
if (r <= 0)
return -1;
while (skip--) {
r = pci_next_dev(&devind, vidp, didp);
if (r <= 0)
return -1;
}
pci_reserve(devind);
return devind;
}
/*===========================================================================*
* w_init *
*===========================================================================*/
static void w_init(int devind, u16_t vid, u16_t did)
{
/* Initialize drives on the controller that we found and reserved. Each
* controller has two channels, each of which may have up to two disks
* attached, so the maximum number of disks per controller is always four.
* In this function, we always initialize the slots for all four disks; later,
* during normal operation, we determine whether the disks are actually there.
* For pure IDE devices (as opposed to e.g. RAID devices), each of the two
* channels on the controller may be in native or compatibility mode. The PCI
* interface field tells us which channel is in which mode. For native
* channels, we get the IRQ and the channel's base control and command
* addresses from the PCI slot, and we manually acknowledge interrupts. For
* compatibility channels, we use the hardcoded legacy IRQs and addresses, and
* enable automatic IRQ reenabling. In both cases, we get the base DMA address
* from the PCI slot if it is there.
*/
int r, irq, native_hook, compat_hook, is_ide, nhooks;
u8_t bcr, scr, interface;
u16_t cr;
u32_t base_cmd, base_ctl, base_dma;
bcr= pci_attr_r8(devind, PCI_BCR);
scr= pci_attr_r8(devind, PCI_SCR);
interface= pci_attr_r8(devind, PCI_PIFR);
is_ide = (bcr == PCI_BCR_MASS_STORAGE && scr == PCI_MS_IDE);
irq = pci_attr_r8(devind, PCI_ILR);
base_dma = pci_attr_r32(devind, PCI_BAR_5) & PCI_BAR_IO_MASK;
nhooks = 0; /* we don't care about notify IDs, but they must be unique */
/* Any native drives? Then register their native IRQ first. */
if (!is_ide || (interface & (ATA_IF_NATIVE0 | ATA_IF_NATIVE1))) {
native_hook = nhooks++;
if ((r = sys_irqsetpolicy(irq, 0, &native_hook)) != OK)
panic("couldn't set native IRQ policy %d: %d", irq, r);
if ((r = sys_irqenable(&native_hook)) != OK)
panic("couldn't enable native IRQ line %d: %d", irq, r);
}
/* Add drives on the primary channel. */
if (!is_ide || (interface & ATA_IF_NATIVE0)) {
base_cmd = pci_attr_r32(devind, PCI_BAR) & PCI_BAR_IO_MASK;
base_ctl = pci_attr_r32(devind, PCI_BAR_2) & PCI_BAR_IO_MASK;
init_drive(0, base_cmd, base_ctl+PCI_CTL_OFF, base_dma, TRUE,
native_hook);
init_drive(1, base_cmd, base_ctl+PCI_CTL_OFF, base_dma, TRUE,
native_hook);
if (w_pci_debug)
printf("at_wini%ld: native 0 on %d: 0x%x 0x%x irq %d\n",
w_instance, devind, base_cmd, base_ctl, irq);
} else {
/* Register first compatibility IRQ. */
compat_hook = nhooks++;
if ((r = sys_irqsetpolicy(AT_WINI_0_IRQ, IRQ_REENABLE,
&compat_hook)) != OK)
panic("couldn't set compat(0) IRQ policy: %d", r);
if ((r = sys_irqenable(&compat_hook)) != OK)
panic("couldn't enable compat(0) IRQ line: %d", r);
init_drive(0, REG_CMD_BASE0, REG_CTL_BASE0, base_dma, FALSE,
compat_hook);
init_drive(1, REG_CMD_BASE0, REG_CTL_BASE0, base_dma, FALSE,
compat_hook);
if (w_pci_debug)
printf("at_wini%ld: compat 0 on %d\n", w_instance, devind);
}
/* Add drives on the secondary channel. */
if (base_dma != 0)
base_dma += PCI_DMA_2ND_OFF;
if (!is_ide || (interface & ATA_IF_NATIVE1)) {
base_cmd = pci_attr_r32(devind, PCI_BAR_3) & PCI_BAR_IO_MASK;
base_ctl = pci_attr_r32(devind, PCI_BAR_4) & PCI_BAR_IO_MASK;
init_drive(2, base_cmd, base_ctl+PCI_CTL_OFF, base_dma, TRUE,
native_hook);
init_drive(3, base_cmd, base_ctl+PCI_CTL_OFF, base_dma, TRUE,
native_hook);
if (w_pci_debug)
printf("at_wini%ld: native 1 on %d: 0x%x 0x%x irq %d\n",
w_instance, devind, base_cmd, base_ctl, irq);
} else {
/* Register secondary compatibility IRQ. */
compat_hook = nhooks++;
if ((r = sys_irqsetpolicy(AT_WINI_1_IRQ, IRQ_REENABLE,
&compat_hook)) != OK)
panic("couldn't set compat(1) IRQ policy: %d", r);
if ((r = sys_irqenable(&compat_hook)) != OK)
panic("couldn't enable compat(1) IRQ line: %d", r);
init_drive(2, REG_CMD_BASE1, REG_CTL_BASE1, base_dma, FALSE,
compat_hook);
init_drive(3, REG_CMD_BASE1, REG_CTL_BASE1, base_dma, FALSE,
compat_hook);
if (w_pci_debug)
printf("at_wini%ld: compat 1 on %d\n", w_instance, devind);
}
/* Enable busmastering if necessary. */
cr = pci_attr_r16(devind, PCI_CR);
if (!(cr & PCI_CR_MAST_EN))
pci_attr_w16(devind, PCI_CR, cr | PCI_CR_MAST_EN);
}
/*===========================================================================*
* w_do_open *
*===========================================================================*/
static int w_do_open(devminor_t minor, int access)
{
/* Device open: Initialize the controller and read the partition table. */
struct wini *wn;
if (w_prepare(minor) == NULL) return(ENXIO);
wn = w_wn;
/* If we've probed it before and it failed, don't probe it again. */
if (wn->state & IGNORING) return ENXIO;
/* If we haven't identified it yet, or it's gone deaf,
* (re-)identify it.
*/
if (!(wn->state & IDENTIFIED) || (wn->state & DEAF)) {
/* Try to identify the device. */
if (w_identify() != OK) {
#if VERBOSE
printf("%s: identification failed\n", w_name());
#endif
if (wn->state & DEAF){
int err = w_reset();
if( err != OK ){
return err;
}
}
wn->state = IGNORING;
return(ENXIO);
}
/* Do a test transaction unless it's a CD drive (then
* we can believe the controller, and a test may fail
* due to no CD being in the drive). If it fails, ignore
* the device forever.
*/
if (!(wn->state & ATAPI) && w_io_test() != OK) {
wn->state |= IGNORING;
return(ENXIO);
}
}
if ((wn->state & ATAPI) && (access & BDEV_W_BIT))
return(EACCES);
/* Partition the drive if it's being opened for the first time,
* or being opened after being closed.
*/
if (wn->open_ct == 0) {
if (wn->state & ATAPI) {
int r;
if ((r = atapi_open()) != OK) return(r);
}
/* Partition the disk. */
partition(&w_dtab, w_drive * DEV_PER_DRIVE, P_PRIMARY,
wn->state & ATAPI);
}
wn->open_ct++;
return(OK);
}
/*===========================================================================*
* w_prepare *
*===========================================================================*/
static struct device *w_prepare(devminor_t device)
{
/* Prepare for I/O on a device. */
w_device = (int) device;
if (device >= 0 && device < NR_MINORS) { /* d0, d0p[0-3], d1, ... */
w_drive = device / DEV_PER_DRIVE; /* save drive number */
if (w_drive >= MAX_DRIVES) return(NULL);
w_wn = &wini[w_drive];
w_dv = &w_wn->part[device % DEV_PER_DRIVE];
} else
if ((unsigned) (device -= MINOR_d0p0s0) < NR_SUBDEVS) {/*d[0-7]p[0-3]s[0-3]*/
w_drive = device / SUB_PER_DRIVE;
if (w_drive >= MAX_DRIVES) return(NULL);
w_wn = &wini[w_drive];
w_dv = &w_wn->subpart[device % SUB_PER_DRIVE];
} else {
w_device = -1;
return(NULL);
}
return(w_dv);
}
/*===========================================================================*
* w_part *
*===========================================================================*/
static struct device *w_part(devminor_t device)
{
/* Return a pointer to the partition information of the given minor device. */
return w_prepare(device);
}
#define id_byte(n) (&tmp_buf[2 * (n)])
#define id_word(n) (((u16_t) id_byte(n)[0] << 0) \
|((u16_t) id_byte(n)[1] << 8))
#define id_longword(n) (((u32_t) id_byte(n)[0] << 0) \
|((u32_t) id_byte(n)[1] << 8) \
|((u32_t) id_byte(n)[2] << 16) \
|((u32_t) id_byte(n)[3] << 24))
/*===========================================================================*
* check_dma *
*===========================================================================*/
static void
check_dma(struct wini *wn)
{
u32_t dma_status, dma_base;
int id_dma, ultra_dma;
u16_t w;
wn->dma= 0;
if (disable_dma)
return;
w= id_word(ID_CAPABILITIES);
id_dma= !!(w & ID_CAP_DMA);
w= id_byte(ID_FIELD_VALIDITY)[0];
ultra_dma= !!(w & ID_FV_88);
dma_base= wn->base_dma;
if (dma_base) {
if (sys_inb(dma_base + DMA_STATUS, &dma_status) != OK) {
panic("unable to read DMA status register");
}
}
if (id_dma && dma_base) {
w= id_word(ID_MULTIWORD_DMA);
if (w_pci_debug &&
(w & (ID_MWDMA_2_SUP|ID_MWDMA_1_SUP|ID_MWDMA_0_SUP))) {
printf(
"%s: multiword DMA modes supported:%s%s%s\n",
w_name(),
(w & ID_MWDMA_0_SUP) ? " 0" : "",
(w & ID_MWDMA_1_SUP) ? " 1" : "",
(w & ID_MWDMA_2_SUP) ? " 2" : "");
}
if (w_pci_debug &&
(w & (ID_MWDMA_0_SEL|ID_MWDMA_1_SEL|ID_MWDMA_2_SEL))) {
printf(
"%s: multiword DMA mode selected:%s%s%s\n",
w_name(),
(w & ID_MWDMA_0_SEL) ? " 0" : "",
(w & ID_MWDMA_1_SEL) ? " 1" : "",
(w & ID_MWDMA_2_SEL) ? " 2" : "");
}
if (w_pci_debug && ultra_dma) {
w= id_word(ID_ULTRA_DMA);
if (w & (ID_UDMA_0_SUP|ID_UDMA_1_SUP|
ID_UDMA_2_SUP|ID_UDMA_3_SUP|
ID_UDMA_4_SUP|ID_UDMA_5_SUP)) {
printf(
"%s: Ultra DMA modes supported:%s%s%s%s%s%s\n",
w_name(),
(w & ID_UDMA_0_SUP) ? " 0" : "",
(w & ID_UDMA_1_SUP) ? " 1" : "",
(w & ID_UDMA_2_SUP) ? " 2" : "",
(w & ID_UDMA_3_SUP) ? " 3" : "",
(w & ID_UDMA_4_SUP) ? " 4" : "",
(w & ID_UDMA_5_SUP) ? " 5" : "");
}
if (w & (ID_UDMA_0_SEL|ID_UDMA_1_SEL|
ID_UDMA_2_SEL|ID_UDMA_3_SEL|
ID_UDMA_4_SEL|ID_UDMA_5_SEL)) {
printf(
"%s: Ultra DMA mode selected:%s%s%s%s%s%s\n",
w_name(),
(w & ID_UDMA_0_SEL) ? " 0" : "",
(w & ID_UDMA_1_SEL) ? " 1" : "",
(w & ID_UDMA_2_SEL) ? " 2" : "",
(w & ID_UDMA_3_SEL) ? " 3" : "",
(w & ID_UDMA_4_SEL) ? " 4" : "",
(w & ID_UDMA_5_SEL) ? " 5" : "");
}
}
wn->dma= 1;
} else if (id_dma || dma_base) {
printf("id_dma %d, dma_base 0x%x\n", id_dma, dma_base);
} else
printf("no DMA support\n");
}
/*===========================================================================*
* w_identify *
*===========================================================================*/
static int w_identify(void)
{
/* Find out if a device exists, if it is an old AT disk, or a newer ATA
* drive, a removable media device, etc.
*/
struct wini *wn = w_wn;
struct command cmd;
int s;
u16_t w;
unsigned long size;
int prev_wakeup;
int r;
/* Try to identify the device. */
cmd.ldh = wn->ldhpref;
cmd.command = ATA_IDENTIFY;
/* In testing mode, a drive will get ignored at the first timeout. */
w_testing = 1;
/* Execute *_IDENTIFY with configured *_IDENTIFY timeout. */
prev_wakeup = wakeup_ticks;
wakeup_ticks = w_identify_wakeup_ticks;
r = com_simple(&cmd);
if (r == OK && w_waitfor(STATUS_DRQ, STATUS_DRQ) &&
!(wn->w_status & (STATUS_ERR|STATUS_WF))) {
/* Device information. */
if ((s=sys_insw(wn->base_cmd + REG_DATA, SELF, tmp_buf, SECTOR_SIZE)) != OK)
panic("Call to sys_insw() failed: %d", s);
/* This is an ATA device. */
wn->state |= SMART;
/* Preferred CHS translation mode. */
wn->cylinders = id_word(1);
wn->heads = id_word(3);
wn->sectors = id_word(6);
size = (u32_t) wn->cylinders * wn->heads * wn->sectors;
w= id_word(ID_CAPABILITIES);
if ((w & ID_CAP_LBA) && size > 512L*1024*2) {
/* Drive is LBA capable and is big enough to trust it to
* not make a mess of it.
*/
wn->ldhpref |= LDH_LBA;
size = id_longword(60);
w= id_word(ID_CSS);
if (size < LBA48_CHECK_SIZE)
{
/* No need to check for LBA48 */
}
else if (w & ID_CSS_LBA48) {
/* Drive is LBA48 capable (and LBA48 is turned on). */
if (id_longword(102)) {
/* If no. of sectors doesn't fit in 32 bits,
* trunacte to this. So it's LBA32 for now.
* This can still address devices up to 2TB
* though.
*/
size = ULONG_MAX;
} else {
/* Actual number of sectors fits in 32 bits. */
size = id_longword(100);
}
wn->lba48 = 1;
}
check_dma(wn);
}
} else if (cmd.command = ATAPI_IDENTIFY,
com_simple(&cmd) == OK && w_waitfor(STATUS_DRQ, STATUS_DRQ) &&
!(wn->w_status & (STATUS_ERR|STATUS_WF))) {
/* An ATAPI device. */
wn->state |= ATAPI;
/* Device information. */
if ((s=sys_insw(wn->base_cmd + REG_DATA, SELF, tmp_buf, 512)) != OK)
panic("Call to sys_insw() failed: %d", s);
size = 0; /* Size set later. */
check_dma(wn);
} else {
/* Not an ATA device; no translations, no special features. Don't
* touch it.
*/
wakeup_ticks = prev_wakeup;
w_testing = 0;
return(ERR);
}
/* Restore wakeup_ticks and unset testing mode. */
wakeup_ticks = prev_wakeup;
w_testing = 0;
/* Size of the whole drive */
wn->part[0].dv_size = (u64_t)size * SECTOR_SIZE;
/* Reset/calibrate (where necessary) */
if (w_specify() != OK && w_specify() != OK) {
return(ERR);
}
wn->state |= IDENTIFIED;
return(OK);
}
/*===========================================================================*
* w_name *
*===========================================================================*/
static char *w_name(void)
{
/* Return a name for the current device. */
static char name[] = "AT0-D0";
name[2] = '0' + w_instance;
name[5] = '0' + w_drive;
return name;
}
/*===========================================================================*
* w_io_test *
*===========================================================================*/
static int w_io_test(void)
{
int save_dev;
int save_timeout, save_errors, save_wakeup;
iovec_t iov;
static char *buf;
ssize_t r;
#define BUFSIZE CD_SECTOR_SIZE
STATICINIT(buf, BUFSIZE);
iov.iov_addr = (vir_bytes) buf;
iov.iov_size = BUFSIZE;
save_dev = w_device;
/* Reduce timeout values for this test transaction. */
save_timeout = timeout_usecs;
save_errors = max_errors;
save_wakeup = wakeup_ticks;
if (!w_standard_timeouts) {
timeout_usecs = 4000000;
wakeup_ticks = system_hz * 6;
max_errors = 3;
}
w_testing = 1;
/* Try I/O on the actual drive (not any (sub)partition). */
r = w_transfer(w_drive * DEV_PER_DRIVE, FALSE /*do_write*/, 0,
SELF, &iov, 1, BDEV_NOFLAGS);
/* Switch back. */
if (w_prepare(save_dev) == NULL)
panic("Couldn't switch back devices");
/* Restore parameters. */
timeout_usecs = save_timeout;
max_errors = save_errors;
wakeup_ticks = save_wakeup;
w_testing = 0;
/* Test if everything worked. */
if (r != BUFSIZE) {
return ERR;
}
/* Everything worked. */
return OK;
}
/*===========================================================================*
* w_specify *
*===========================================================================*/
static int w_specify(void)
{
/* Routine to initialize the drive after boot or when a reset is needed. */
struct wini *wn = w_wn;
struct command cmd;
if ((wn->state & DEAF) && w_reset() != OK) {
return(ERR);
}
if (!(wn->state & ATAPI)) {
/* Specify parameters: precompensation, number of heads and sectors. */
cmd.precomp = 0;
cmd.count = wn->sectors;
cmd.ldh = w_wn->ldhpref | (wn->heads - 1);
cmd.command = CMD_SPECIFY; /* Specify some parameters */
/* Output command block and see if controller accepts the parameters. */
if (com_simple(&cmd) != OK) return(ERR);
if (!(wn->state & SMART)) {
/* Calibrate an old disk. */
cmd.sector = 0;
cmd.cyl_lo = 0;
cmd.cyl_hi = 0;
cmd.ldh = w_wn->ldhpref;
cmd.command = CMD_RECALIBRATE;
if (com_simple(&cmd) != OK) return(ERR);
}
}
wn->state |= INITIALIZED;
return(OK);
}
/*===========================================================================*
* do_transfer *
*===========================================================================*/
static int do_transfer(const struct wini *wn, unsigned int count,
unsigned int sector, unsigned int do_write, int do_dma)
{
struct command cmd;
unsigned int sector_high;
unsigned secspcyl = wn->heads * wn->sectors;
int do_lba48;
sector_high= 0; /* For future extensions */
do_lba48= 0;
if (sector >= LBA48_CHECK_SIZE || sector_high != 0)
{
if (wn->lba48)
do_lba48= 1;
else if (sector > LBA_MAX_SIZE || sector_high != 0)
{
/* Strange sector count for LBA device */
return EIO;
}
}
cmd.precomp = 0;
cmd.count = count;
if (do_dma)
{
cmd.command = do_write ? CMD_WRITE_DMA : CMD_READ_DMA;
}
else
cmd.command = do_write ? CMD_WRITE : CMD_READ;
if (do_lba48) {
if (do_dma)
{
cmd.command = (do_write ?
CMD_WRITE_DMA_EXT : CMD_READ_DMA_EXT);
}
else
{
cmd.command = (do_write ?
CMD_WRITE_EXT : CMD_READ_EXT);
}
cmd.count_prev= (count >> 8);
cmd.sector = (sector >> 0) & 0xFF;
cmd.cyl_lo = (sector >> 8) & 0xFF;
cmd.cyl_hi = (sector >> 16) & 0xFF;
cmd.sector_prev= (sector >> 24) & 0xFF;
cmd.cyl_lo_prev= (sector_high) & 0xFF;
cmd.cyl_hi_prev= (sector_high >> 8) & 0xFF;
cmd.ldh = wn->ldhpref;
return com_out_ext(&cmd);
} else if (wn->ldhpref & LDH_LBA) {
cmd.sector = (sector >> 0) & 0xFF;
cmd.cyl_lo = (sector >> 8) & 0xFF;
cmd.cyl_hi = (sector >> 16) & 0xFF;
cmd.ldh = wn->ldhpref | ((sector >> 24) & 0xF);
} else {
int cylinder, head, sec;
cylinder = sector / secspcyl;
head = (sector % secspcyl) / wn->sectors;
sec = sector % wn->sectors;
cmd.sector = sec + 1;
cmd.cyl_lo = cylinder & BYTE;
cmd.cyl_hi = (cylinder >> 8) & BYTE;
cmd.ldh = wn->ldhpref | head;
}
return com_out(&cmd);
}
static void stop_dma(const struct wini *wn)
{
int r;
/* Stop bus master operation */
r= sys_outb(wn->base_dma + DMA_COMMAND, 0);
if (r != 0) panic("stop_dma: sys_outb failed: %d", r);
}
static void start_dma(const struct wini *wn, int do_write)
{
u32_t v;
int r;
/* Assume disk reads. Start DMA */
v= DMA_CMD_START;
if (!do_write)
{
/* Disk reads generate PCI write cycles. */
v |= DMA_CMD_WRITE;
}
r= sys_outb(wn->base_dma + DMA_COMMAND, v);
if (r != 0) panic("start_dma: sys_outb failed: %d", r);
}
static int error_dma(const struct wini *wn)
{
int r;
u32_t v;
#define DMAERR(msg) \
printf("at_wini%ld: bad DMA: %s. Disabling DMA for drive %d.\n", \
w_instance, msg, wn - wini); \
printf("at_wini%ld: workaround: set %s=1 in boot monitor.\n", \
w_instance, NO_DMA_VAR); \
return 1; \
r= sys_inb(wn->base_dma + DMA_STATUS, &v);
if (r != 0) panic("w_transfer: sys_inb failed: %d", r);
if (!wn->dma_intseen) {
/* DMA did not complete successfully */
if (v & DMA_ST_BM_ACTIVE) {
DMAERR("DMA did not complete");
} else if (v & DMA_ST_ERROR) {
DMAERR("DMA error");
} else {
DMAERR("DMA buffer too small");
}
} else if ((v & DMA_ST_BM_ACTIVE)) {
DMAERR("DMA buffer too large");
}
return 0;
}
/*===========================================================================*
* w_transfer *
*===========================================================================*/
static ssize_t w_transfer(
devminor_t minor, /* minor device to perform the transfer on */
int do_write, /* read or write? */
u64_t position, /* offset on device to read or write */
endpoint_t proc_nr, /* process doing the request */
iovec_t *iov, /* pointer to read or write request vector */
unsigned int nr_req, /* length of request vector */
int UNUSED(flags) /* transfer flags */
)
{
struct wini *wn;
iovec_t *iop, *iov_end = iov + nr_req;
int r, s, errors, do_dma;
unsigned long block;
u32_t w_status;
u64_t dv_size;
unsigned int n, nbytes;
unsigned dma_buf_offset;
ssize_t total = 0;
size_t addr_offset = 0;
if (w_prepare(minor) == NULL) return(ENXIO);
wn = w_wn;
dv_size = w_dv->dv_size;
if (w_wn->state & ATAPI) {
return atapi_transfer(do_write, position, proc_nr, iov, nr_req);
}
/* Check disk address. */
if ((unsigned)(position % SECTOR_SIZE) != 0) return(EINVAL);
errors = 0;
while (nr_req > 0) {
/* How many bytes to transfer? */
nbytes = 0;
for (iop = iov; iop < iov_end; iop++) nbytes += iop->iov_size;
if ((nbytes & SECTOR_MASK) != 0) return(EINVAL);
/* Which block on disk and how close to EOF? */
if (position >= dv_size) return(total); /* At EOF */
if (position + nbytes > dv_size)
nbytes = (unsigned)(dv_size - position);
block = (unsigned long)((w_dv->dv_base + position) / SECTOR_SIZE);
do_dma= wn->dma;
if (nbytes >= wn->max_count) {
/* The drive can't do more then max_count at once. */
nbytes = wn->max_count;
}
/* First check to see if a reinitialization is needed. */
if (!(wn->state & INITIALIZED) && w_specify() != OK) return(EIO);
if (do_dma) {
stop_dma(wn);
if (!setup_dma(&nbytes, proc_nr, iov, addr_offset, do_write)) {
do_dma = 0;
}
#if 0
printf("nbytes = %d\n", nbytes);
#endif
}
/* Tell the controller to transfer nbytes bytes. */
r = do_transfer(wn, (nbytes >> SECTOR_SHIFT), block, do_write, do_dma);
if (do_dma)
start_dma(wn, do_write);
if (do_write) {
/* The specs call for a 400 ns wait after issuing the command.
* Reading the alternate status register is the suggested
* way to implement this wait.
*/
if (sys_inb((wn->base_ctl+REG_CTL_ALTSTAT), &w_status) != OK)
panic("couldn't get status");
}
if (do_dma) {
/* Wait for the interrupt, check DMA status and optionally
* copy out.
*/
wn->dma_intseen = 0;
if ((r = at_intr_wait()) != OK)
{
/* Don't retry if sector marked bad or too many
* errors.
*/
if (r == ERR_BAD_SECTOR || ++errors == max_errors) {
w_command = CMD_IDLE;
return(EIO);
}
continue;
}
/* Wait for DMA_ST_INT to get set */
if (!wn->dma_intseen) {
if(w_waitfor_dma(DMA_ST_INT, DMA_ST_INT))
wn->dma_intseen = 1;
}
if (error_dma(wn)) {
wn->dma = 0;
continue;
}
stop_dma(wn);
dma_buf_offset= 0;
while (r == OK && nbytes > 0)
{
n= iov->iov_size;
if (n > nbytes)
n= nbytes;
/* Book the bytes successfully transferred. */
nbytes -= n;
position= position + n;
total += n;
addr_offset += n;
if ((iov->iov_size -= n) == 0) {
iov++; nr_req--; addr_offset = 0;
}
dma_buf_offset += n;
}
}
while (r == OK && nbytes > 0) {
/* For each sector, wait for an interrupt and fetch the data
* (read), or supply data to the controller and wait for an
* interrupt (write).
*/
if (!do_write) {
/* First an interrupt, then data. */
if ((r = at_intr_wait()) != OK) {
/* An error, send data to the bit bucket. */
if (w_wn->w_status & STATUS_DRQ) {
if ((s=sys_insw(wn->base_cmd+REG_DATA,
SELF, tmp_buf,
SECTOR_SIZE)) != OK) {
panic("Call to sys_insw() failed: %d", s);
}
}
break;
}
}
/* Wait for busy to clear. */
if (!w_waitfor(STATUS_BSY, 0)) { r = ERR; break; }
/* Wait for data transfer requested. */
if (!w_waitfor(STATUS_DRQ, STATUS_DRQ)) { r = ERR; break; }
/* Copy bytes to or from the device's buffer. */
if (!do_write) {
if(proc_nr != SELF) {
s=sys_safe_insw(wn->base_cmd + REG_DATA, proc_nr,
(void *) (iov->iov_addr), addr_offset,
SECTOR_SIZE);
} else {
s=sys_insw(wn->base_cmd + REG_DATA, proc_nr,
(void *) (iov->iov_addr + addr_offset),
SECTOR_SIZE);
}
if(s != OK) {
panic("Call to sys_insw() failed: %d", s);
}
} else {
if(proc_nr != SELF) {
s=sys_safe_outsw(wn->base_cmd + REG_DATA, proc_nr,
(void *) (iov->iov_addr), addr_offset,
SECTOR_SIZE);
} else {
s=sys_outsw(wn->base_cmd + REG_DATA, proc_nr,
(void *) (iov->iov_addr + addr_offset),
SECTOR_SIZE);
}
if(s != OK) {
panic("Call to sys_outsw() failed: %d", s);
}
/* Data sent, wait for an interrupt. */
if ((r = at_intr_wait()) != OK) break;
}
/* Book the bytes successfully transferred. */
nbytes -= SECTOR_SIZE;
position = position + SECTOR_SIZE;
addr_offset += SECTOR_SIZE;
total += SECTOR_SIZE;
if ((iov->iov_size -= SECTOR_SIZE) == 0) {
iov++;
nr_req--;
addr_offset = 0;
}
}
/* Any errors? */
if (r != OK) {
/* Don't retry if sector marked bad or too many errors. */
if (r == ERR_BAD_SECTOR || ++errors == max_errors) {
w_command = CMD_IDLE;
return(EIO);
}
}
}
w_command = CMD_IDLE;
return(total);
}
/*===========================================================================*
* com_out *
*===========================================================================*/
static int com_out(cmd)
struct command *cmd; /* Command block */
{
/* Output the command block to the winchester controller and return status */
struct wini *wn = w_wn;
unsigned base_cmd = wn->base_cmd;
unsigned base_ctl = wn->base_ctl;
pvb_pair_t outbyte[7]; /* vector for sys_voutb() */
int s; /* status for sys_(v)outb() */
if (w_wn->state & IGNORING) return ERR;
if (!w_waitfor(STATUS_BSY, 0)) {
printf("%s: controller not ready\n", w_name());
return(ERR);
}
/* Select drive. */
if ((s=sys_outb(base_cmd + REG_LDH, cmd->ldh)) != OK)
panic("Couldn't write register to select drive: %d", s);
if (!w_waitfor(STATUS_BSY, 0)) {
printf("%s: com_out: drive not ready\n", w_name());
return(ERR);
}
/* Schedule a wakeup call, some controllers are flaky. This is done with a
* synchronous alarm. If a timeout occurs a notify from CLOCK is sent, so that
* w_intr_wait() can call w_timeout() in case the controller was not able to
* execute the command. Leftover timeouts are simply ignored by the main loop.
*/
sys_setalarm(wakeup_ticks, 0);
wn->w_status = STATUS_ADMBSY;
w_command = cmd->command;
pv_set(outbyte[0], base_ctl + REG_CTL, wn->heads >= 8 ? CTL_EIGHTHEADS : 0);
pv_set(outbyte[1], base_cmd + REG_PRECOMP, cmd->precomp);
pv_set(outbyte[2], base_cmd + REG_COUNT, cmd->count);
pv_set(outbyte[3], base_cmd + REG_SECTOR, cmd->sector);
pv_set(outbyte[4], base_cmd + REG_CYL_LO, cmd->cyl_lo);
pv_set(outbyte[5], base_cmd + REG_CYL_HI, cmd->cyl_hi);
pv_set(outbyte[6], base_cmd + REG_COMMAND, cmd->command);
if ((s=sys_voutb(outbyte,7)) != OK)
panic("Couldn't write registers with sys_voutb(): %d", s);
return(OK);
}
/*===========================================================================*
* com_out_ext *
*===========================================================================*/
static int com_out_ext(cmd)
struct command *cmd; /* Command block */
{
/* Output the command block to the winchester controller and return status */
struct wini *wn = w_wn;
unsigned base_cmd = wn->base_cmd;
unsigned base_ctl = wn->base_ctl;
pvb_pair_t outbyte[11]; /* vector for sys_voutb() */
int s; /* status for sys_(v)outb() */
if (w_wn->state & IGNORING) return ERR;
if (!w_waitfor(STATUS_BSY, 0)) {
printf("%s: controller not ready\n", w_name());
return(ERR);
}
/* Select drive. */
if ((s=sys_outb(base_cmd + REG_LDH, cmd->ldh)) != OK)
panic("Couldn't write register to select drive: %d", s);
if (!w_waitfor(STATUS_BSY, 0)) {
printf("%s: com_out: drive not ready\n", w_name());
return(ERR);
}
/* Schedule a wakeup call, some controllers are flaky. This is done with a
* synchronous alarm. If a timeout occurs a notify from CLOCK is sent, so that
* w_intr_wait() can call w_timeout() in case the controller was not able to
* execute the command. Leftover timeouts are simply ignored by the main loop.
*/
sys_setalarm(wakeup_ticks, 0);
wn->w_status = STATUS_ADMBSY;
w_command = cmd->command;
pv_set(outbyte[0], base_ctl + REG_CTL, 0);
pv_set(outbyte[1], base_cmd + REG_COUNT, cmd->count_prev);
pv_set(outbyte[2], base_cmd + REG_SECTOR, cmd->sector_prev);
pv_set(outbyte[3], base_cmd + REG_CYL_LO, cmd->cyl_lo_prev);
pv_set(outbyte[4], base_cmd + REG_CYL_HI, cmd->cyl_hi_prev);
pv_set(outbyte[5], base_cmd + REG_COUNT, cmd->count);
pv_set(outbyte[6], base_cmd + REG_SECTOR, cmd->sector);
pv_set(outbyte[7], base_cmd + REG_CYL_LO, cmd->cyl_lo);
pv_set(outbyte[8], base_cmd + REG_CYL_HI, cmd->cyl_hi);
pv_set(outbyte[9], base_cmd + REG_COMMAND, cmd->command);
if ((s=sys_voutb(outbyte, 10)) != OK)
panic("Couldn't write registers with sys_voutb(): %d", s);
return(OK);
}
/*===========================================================================*
* setup_dma *
*===========================================================================*/
static int setup_dma(
unsigned *sizep,
endpoint_t proc_nr,
iovec_t *iov,
size_t addr_offset,
int UNUSED(do_write)
)
{
phys_bytes user_phys;
unsigned n, offset, size;
int i, j, r;
u32_t v;
struct wini *wn = w_wn;
/* First try direct scatter/gather to the supplied buffers */
size= *sizep;
i= 0; /* iov index */
j= 0; /* prdt index */
offset= 0; /* Offset in current iov */
#if VERBOSE_DMA
printf("at_wini: setup_dma: proc_nr %d\n", proc_nr);
#endif
while (size > 0)
{
#if VERBOSE_DMA
printf(
"at_wini: setup_dma: iov[%d]: addr 0x%lx, size %ld offset %d, size %d\n",
i, iov[i].iov_addr, iov[i].iov_size, offset, size);
#endif
n= iov[i].iov_size-offset;
if (n > size)
n= size;
if (n == 0 || (n & 1))
panic("bad size in iov: 0x%lx", iov[i].iov_size);
if(proc_nr != SELF) {
r= sys_umap(proc_nr, VM_GRANT, iov[i].iov_addr, n,
&user_phys);
if (r != 0)
panic("can't map user buffer (VM_GRANT): %d", r);
user_phys += offset + addr_offset;
} else {
r= sys_umap(proc_nr, VM_D,
iov[i].iov_addr+offset+addr_offset, n,
&user_phys);
if (r != 0)
panic("can't map user buffer (VM_D): %d", r);
}
if (user_phys & 1)
{
/* Buffer is not aligned */
printf("setup_dma: user buffer is not aligned\n");
return 0;
}
/* vector is not allowed to cross a 64K boundary */
if (user_phys/0x10000 != (user_phys+n-1)/0x10000)
n= ((user_phys/0x10000)+1)*0x10000 - user_phys;
/* vector is not allowed to be bigger than 64K, but we get that
* for free.
*/
if (j >= N_PRDTE)
{
/* Too many entries */
printf("setup_dma: user buffer has too many entries\n");
return 0;
}
prdt[j].prdte_base= user_phys;
prdt[j].prdte_count= n;
prdt[j].prdte_reserved= 0;
prdt[j].prdte_flags= 0;
j++;
offset += n;
if (offset >= iov[i].iov_size)
{
i++;
offset= 0;
addr_offset= 0;
}
size -= n;
}
if (j <= 0 || j > N_PRDTE)
panic("bad prdt index: %d", j);
prdt[j-1].prdte_flags |= PRDTE_FL_EOT;
#if VERBOSE_DMA
printf("dma not bad\n");
for (i= 0; i<j; i++) {
printf("prdt[%d]: base 0x%lx, size %d, flags 0x%x\n",
i, prdt[i].prdte_base, prdt[i].prdte_count,
prdt[i].prdte_flags);
}
#endif
/* Verify that the bus master is not active */
r= sys_inb(wn->base_dma + DMA_STATUS, &v);
if (r != 0) panic("setup_dma: sys_inb failed: %d", r);
if (v & DMA_ST_BM_ACTIVE)
panic("Bus master IDE active");
if (prdt_phys & 3)
panic("prdt not aligned: 0x%lx", prdt_phys);
r= sys_outl(wn->base_dma + DMA_PRDTP, prdt_phys);
if (r != 0) panic("setup_dma: sys_outl failed: %d", r);
/* Clear interrupt and error flags */
r= sys_outb(wn->base_dma + DMA_STATUS, DMA_ST_INT | DMA_ST_ERROR);
if (r != 0) panic("setup_dma: sys_outb failed: %d", r);
return 1;
}
/*===========================================================================*
* w_need_reset *
*===========================================================================*/
static void w_need_reset(void)
{
/* The controller needs to be reset. */
struct wini *wn;
for (wn = wini; wn < &wini[MAX_DRIVES]; wn++) {
if (wn->base_cmd == w_wn->base_cmd) {
wn->state |= DEAF;
wn->state &= ~INITIALIZED;
}
}
}
/*===========================================================================*
* w_do_close *
*===========================================================================*/
static int w_do_close(devminor_t minor)
{
/* Device close: Release a device. */
if (w_prepare(minor) == NULL)
return(ENXIO);
w_wn->open_ct--;
if (w_wn->open_ct == 0 && (w_wn->state & ATAPI)) atapi_close();
return(OK);
}
/*===========================================================================*
* com_simple *
*===========================================================================*/
static int com_simple(cmd)
struct command *cmd; /* Command block */
{
/* A simple controller command, only one interrupt and no data-out phase. */
int r;
if (w_wn->state & IGNORING) return ERR;
if ((r = com_out(cmd)) == OK) r = at_intr_wait();
w_command = CMD_IDLE;
return(r);
}
/*===========================================================================*
* w_timeout *
*===========================================================================*/
static void w_timeout(void)
{
struct wini *wn = w_wn;
switch (w_command) {
case CMD_IDLE:
break; /* fine */
case CMD_READ:
case CMD_READ_EXT:
case CMD_WRITE:
case CMD_WRITE_EXT:
/* Impossible, but not on PC's: The controller does not respond. */
/* Limiting multisector I/O seems to help. */
if (wn->max_count > 8 * SECTOR_SIZE) {
wn->max_count = 8 * SECTOR_SIZE;
} else {
wn->max_count = SECTOR_SIZE;
}
/*FALL THROUGH*/
default:
/* Some other command. */
if (w_testing) wn->state |= IGNORING; /* Kick out this drive. */
else if (!w_silent) printf("%s: timeout on command 0x%02x\n",
w_name(), w_command);
w_need_reset();
wn->w_status = 0;
}
}
/*===========================================================================*
* w_reset *
*===========================================================================*/
static int w_reset(void)
{
/* Issue a reset to the controller. This is done after any catastrophe,
* like the controller refusing to respond.
*/
int s;
struct wini *wn = w_wn;
/* Don't bother if this drive is forgotten. */
if (w_wn->state & IGNORING) return ERR;
/* Wait for any internal drive recovery. */
tickdelay(RECOVERY_TICKS);
/* Strobe reset bit */
if ((s=sys_outb(wn->base_ctl + REG_CTL, CTL_RESET)) != OK)
panic("Couldn't strobe reset bit: %d", s);
tickdelay(DELAY_TICKS);
if ((s=sys_outb(wn->base_ctl + REG_CTL, 0)) != OK)
panic("Couldn't strobe reset bit: %d", s);
tickdelay(DELAY_TICKS);
/* Wait for controller ready */
if (!w_waitfor(STATUS_BSY, 0)) {
printf("%s: reset failed, drive busy\n", w_name());
return(ERR);
}
/* The error register should be checked now, but some drives mess it up. */
for (wn = wini; wn < &wini[MAX_DRIVES]; wn++) {
if (wn->base_cmd == w_wn->base_cmd) {
wn->state &= ~DEAF;
if (w_wn->native) {
/* Make sure irq is actually enabled.. */
sys_irqenable(&w_wn->irq_hook_id);
}
}
}
return(OK);
}
/*===========================================================================*
* w_intr_wait *
*===========================================================================*/
static void w_intr_wait(void)
{
/* Wait for a task completion interrupt. */
int r;
u32_t w_status;
message m;
int ipc_status;
if (w_wn->state & IDENTIFIED) {
/* Wait for an interrupt that sets w_status to "not busy".
* (w_timeout() also clears w_status.)
*/
while (w_wn->w_status & (STATUS_ADMBSY|STATUS_BSY)) {
if ((r=driver_receive(ANY, &m, &ipc_status)) != OK)
panic("driver_receive failed: %d", r);
if (is_ipc_notify(ipc_status)) {
switch (_ENDPOINT_P(m.m_source)) {
case CLOCK:
/* Timeout. */
w_timeout(); /* a.o. set w_status */
break;
case HARDWARE:
/* Interrupt. */
r= sys_inb(w_wn->base_cmd +
REG_STATUS, &w_status);
if (r != 0)
panic("sys_inb failed: %d", r);
w_wn->w_status= w_status;
w_hw_int(m.NOTIFY_ARG);
break;
default:
/*
* unhandled message. queue it and
* handle it in the blockdriver loop.
*/
blockdriver_mq_queue(&m, ipc_status);
}
}
else {
/*
* unhandled message. queue it and handle it in the
* blockdriver loop.
*/
blockdriver_mq_queue(&m, ipc_status);
}
}
} else {
/* Device not yet identified; use polling. */
(void) w_waitfor(STATUS_BSY, 0);
}
}
/*===========================================================================*
* at_intr_wait *
*===========================================================================*/
static int at_intr_wait(void)
{
/* Wait for an interrupt, study the status bits and return error/success. */
int r, s;
u32_t inbval;
w_intr_wait();
if ((w_wn->w_status & (STATUS_BSY | STATUS_WF | STATUS_ERR)) == 0) {
r = OK;
} else {
if ((s=sys_inb(w_wn->base_cmd + REG_ERROR, &inbval)) != OK)
panic("Couldn't read register: %d", s);
if ((w_wn->w_status & STATUS_ERR) && (inbval & ERROR_BB)) {
r = ERR_BAD_SECTOR; /* sector marked bad, retries won't help */
} else {
r = ERR; /* any other error */
}
}
w_wn->w_status |= STATUS_ADMBSY; /* assume still busy with I/O */
return(r);
}
/*===========================================================================*
* w_waitfor *
*===========================================================================*/
static int w_waitfor(mask, value)
int mask; /* status mask */
int value; /* required status */
{
/* Wait until controller is in the required state. Return zero on timeout.
*/
u32_t w_status;
spin_t spin;
int s;
SPIN_FOR(&spin, timeout_usecs) {
if ((s=sys_inb(w_wn->base_cmd + REG_STATUS, &w_status)) != OK)
panic("Couldn't read register: %d", s);
w_wn->w_status= w_status;
if ((w_wn->w_status & mask) == value) {
return 1;
}
}
w_need_reset(); /* controller gone deaf */
return(0);
}
/*===========================================================================*
* w_waitfor_dma *
*===========================================================================*/
static int w_waitfor_dma(mask, value)
unsigned int mask; /* status mask */
unsigned value; /* required status */
{
/* Wait until controller is in the required state. Return zero on timeout.
*/
u32_t w_status;
spin_t spin;
int s;
SPIN_FOR(&spin, timeout_usecs) {
if ((s=sys_inb(w_wn->base_dma + DMA_STATUS, &w_status)) != OK)
panic("Couldn't read register: %d", s);
if ((w_status & mask) == value) {
return 1;
}
}
return(0);
}
/*===========================================================================*
* w_geometry *
*===========================================================================*/
static void w_geometry(devminor_t minor, struct part_geom *entry)
{
struct wini *wn;
if (w_prepare(minor) == NULL) return;
wn = w_wn;
if (wn->state & ATAPI) { /* Make up some numbers. */
entry->cylinders = (unsigned long)(wn->part[0].dv_size / SECTOR_SIZE) / (64*32);
entry->heads = 64;
entry->sectors = 32;
} else { /* Return logical geometry. */
entry->cylinders = wn->cylinders;
entry->heads = wn->heads;
entry->sectors = wn->sectors;
while (entry->cylinders > 1024) {
entry->heads *= 2;
entry->cylinders /= 2;
}
}
}
/*===========================================================================*
* atapi_open *
*===========================================================================*/
static int atapi_open(void)
{
/* Should load and lock the device and obtain its size. For now just set the
* size of the device to something big. What is really needed is a generic
* SCSI layer that does all this stuff for ATAPI and SCSI devices (kjb). (XXX)
*/
w_wn->part[0].dv_size = (u64_t)(800L*1024) * 1024;
return(OK);
}
/*===========================================================================*
* atapi_close *
*===========================================================================*/
static void atapi_close(void)
{
/* Should unlock the device. For now do nothing. (XXX) */
}
static void sense_request(void)
{
int r, i;
static u8_t sense[100], packet[ATAPI_PACKETSIZE];
packet[0] = SCSI_SENSE;
packet[1] = 0;
packet[2] = 0;
packet[3] = 0;
packet[4] = SENSE_PACKETSIZE;
packet[5] = 0;
packet[7] = 0;
packet[8] = 0;
packet[9] = 0;
packet[10] = 0;
packet[11] = 0;
for(i = 0; i < SENSE_PACKETSIZE; i++) sense[i] = 0xff;
r = atapi_sendpacket(packet, SENSE_PACKETSIZE, 0);
if (r != OK) { printf("request sense command failed\n"); return; }
if (atapi_intr_wait(0, 0) <= 0) { printf("WARNING: request response failed\n"); }
if (sys_insw(w_wn->base_cmd + REG_DATA, SELF, (void *) sense, SENSE_PACKETSIZE) != OK)
printf("WARNING: sense reading failed\n");
printf("sense data:");
for(i = 0; i < SENSE_PACKETSIZE; i++) printf(" %02x", sense[i]);
printf("\n");
}
/*===========================================================================*
* atapi_transfer *
*===========================================================================*/
static int atapi_transfer(
int do_write, /* read or write? */
u64_t position, /* offset on device to read or write */
endpoint_t proc_nr, /* process doing the request */
iovec_t *iov, /* pointer to read or write request vector */
unsigned int nr_req /* length of request vector */
)
{
struct wini *wn = w_wn;
iovec_t *iop, *iov_end = iov + nr_req;
int r, s, errors, fresh;
u64_t pos;
unsigned long block;
u64_t dv_size = w_dv->dv_size;
unsigned nbytes, nblocks, before, chunk;
static u8_t packet[ATAPI_PACKETSIZE];
size_t addr_offset = 0;
int dmabytes = 0, piobytes = 0;
ssize_t total = 0;
if (do_write) return(EINVAL);
errors = fresh = 0;
while (nr_req > 0 && !fresh) {
int do_dma = wn->dma && w_atapi_dma;
/* The Minix block size is smaller than the CD block size, so we
* may have to read extra before or after the good data.
*/
pos = w_dv->dv_base + position;
block = (unsigned long)(pos / CD_SECTOR_SIZE);
before = (unsigned)(pos % CD_SECTOR_SIZE);
if (before)
do_dma = 0;
/* How many bytes to transfer? */
nbytes = 0;
for (iop = iov; iop < iov_end; iop++) {
nbytes += iop->iov_size;
if (iop->iov_size % CD_SECTOR_SIZE)
do_dma = 0;
}
/* Data comes in as words, so we have to enforce even byte counts. */
if ((before | nbytes) & 1) return(EINVAL);
/* Which block on disk and how close to EOF? */
if (position >= dv_size) return(total); /* At EOF */
if (position + nbytes > dv_size)
nbytes = (unsigned)(dv_size - position);
nblocks = (before + nbytes + CD_SECTOR_SIZE - 1) / CD_SECTOR_SIZE;
/* First check to see if a reinitialization is needed. */
if (!(wn->state & INITIALIZED) && w_specify() != OK) return(EIO);
/* Build an ATAPI command packet. */
packet[0] = SCSI_READ10;
packet[1] = 0;
packet[2] = (block >> 24) & 0xFF;
packet[3] = (block >> 16) & 0xFF;
packet[4] = (block >> 8) & 0xFF;
packet[5] = (block >> 0) & 0xFF;
packet[6] = 0;
packet[7] = (nblocks >> 8) & 0xFF;
packet[8] = (nblocks >> 0) & 0xFF;
packet[9] = 0;
packet[10] = 0;
packet[11] = 0;
if(do_dma) {
stop_dma(wn);
if (!setup_dma(&nbytes, proc_nr, iov, addr_offset, 0)) {
do_dma = 0;
} else if(nbytes != nblocks * CD_SECTOR_SIZE) {
stop_dma(wn);
do_dma = 0;
}
}
/* Tell the controller to execute the packet command. */
r = atapi_sendpacket(packet, nblocks * CD_SECTOR_SIZE, do_dma);
if (r != OK) goto err;
if(do_dma) {
wn->dma_intseen = 0;
start_dma(wn, 0);
w_intr_wait();
if(!wn->dma_intseen) {
if(w_waitfor_dma(DMA_ST_INT, DMA_ST_INT)) {
wn->dma_intseen = 1;
}
}
if(error_dma(wn)) {
printf("Disabling DMA (ATAPI)\n");
wn->dma = 0;
} else {
dmabytes += nbytes;
while (nbytes > 0) {
chunk = nbytes;
if (chunk > iov->iov_size)
chunk = iov->iov_size;
position = position + chunk;
nbytes -= chunk;
total += chunk;
if ((iov->iov_size -= chunk) == 0) {
iov++;
nr_req--;
}
}
}
continue;
}
/* Read chunks of data. */
while ((r = atapi_intr_wait(do_dma, nblocks * CD_SECTOR_SIZE)) > 0) {
size_t count;
count = r;
while (before > 0 && count > 0) { /* Discard before. */
chunk = before;
if (chunk > count) chunk = count;
if (chunk > DMA_BUF_SIZE) chunk = DMA_BUF_SIZE;
if ((s=sys_insw(wn->base_cmd + REG_DATA,
SELF, tmp_buf, chunk)) != OK)
panic("Call to sys_insw() failed: %d", s);
before -= chunk;
count -= chunk;
}
while (nbytes > 0 && count > 0) { /* Requested data. */
chunk = nbytes;
if (chunk > count) chunk = count;
if (chunk > iov->iov_size) chunk = iov->iov_size;
if(proc_nr != SELF) {
s=sys_safe_insw(wn->base_cmd + REG_DATA,
proc_nr, (void *) iov->iov_addr,
addr_offset, chunk);
} else {
s=sys_insw(wn->base_cmd + REG_DATA, proc_nr,
(void *) (iov->iov_addr + addr_offset),
chunk);
}
if (s != OK)
panic("Call to sys_insw() failed: %d", s);
position = position + chunk;
nbytes -= chunk;
count -= chunk;
addr_offset += chunk;
piobytes += chunk;
fresh = 0;
total += chunk;
if ((iov->iov_size -= chunk) == 0) {
iov++;
nr_req--;
fresh = 1; /* new element is optional */
addr_offset = 0;
}
}
while (count > 0) { /* Excess data. */
chunk = count;
if (chunk > DMA_BUF_SIZE) chunk = DMA_BUF_SIZE;
if ((s=sys_insw(wn->base_cmd + REG_DATA,
SELF, tmp_buf, chunk)) != OK)
panic("Call to sys_insw() failed: %d", s);
count -= chunk;
}
}
if (r < 0) {
err: /* Don't retry if too many errors. */
if (atapi_debug) sense_request();
if (++errors == max_errors) {
w_command = CMD_IDLE;
if (atapi_debug) printf("giving up (%d)\n", errors);
return(EIO);
}
if (atapi_debug) printf("retry (%d)\n", errors);
}
}
#if 0
if(dmabytes) printf("dmabytes %d ", dmabytes);
if(piobytes) printf("piobytes %d", piobytes);
if(dmabytes || piobytes) printf("\n");
#endif
w_command = CMD_IDLE;
return(total);
}
/*===========================================================================*
* atapi_sendpacket *
*===========================================================================*/
static int atapi_sendpacket(packet, cnt, do_dma)
u8_t *packet;
unsigned cnt;
int do_dma;
{
/* Send an Atapi Packet Command */
struct wini *wn = w_wn;
pvb_pair_t outbyte[6]; /* vector for sys_voutb() */
int s;
if (wn->state & IGNORING) return ERR;
/* Select Master/Slave drive */
if ((s=sys_outb(wn->base_cmd + REG_DRIVE, wn->ldhpref)) != OK)
panic("Couldn't select master/ slave drive: %d", s);
if (!w_waitfor(STATUS_BSY | STATUS_DRQ, 0)) {
printf("%s: atapi_sendpacket: drive not ready\n", w_name());
return(ERR);
}
/* Schedule a wakeup call, some controllers are flaky. This is done with
* a synchronous alarm. If a timeout occurs a SYN_ALARM message is sent
* from HARDWARE, so that w_intr_wait() can call w_timeout() in case the
* controller was not able to execute the command. Leftover timeouts are
* simply ignored by the main loop.
*/
sys_setalarm(wakeup_ticks, 0);
if (cnt > 0xFFFE) cnt = 0xFFFE; /* Max data per interrupt. */
w_command = ATAPI_PACKETCMD;
pv_set(outbyte[0], wn->base_cmd + REG_FEAT, do_dma ? FEAT_DMA : 0);
pv_set(outbyte[1], wn->base_cmd + REG_IRR, 0);
pv_set(outbyte[2], wn->base_cmd + REG_SAMTAG, 0);
pv_set(outbyte[3], wn->base_cmd + REG_CNT_LO, (cnt >> 0) & 0xFF);
pv_set(outbyte[4], wn->base_cmd + REG_CNT_HI, (cnt >> 8) & 0xFF);
pv_set(outbyte[5], wn->base_cmd + REG_COMMAND, w_command);
if (atapi_debug) printf("cmd: %x ", w_command);
if ((s=sys_voutb(outbyte,6)) != OK)
panic("Couldn't write registers with sys_voutb(): %d", s);
if (!w_waitfor(STATUS_BSY | STATUS_DRQ, STATUS_DRQ)) {
printf("%s: timeout (BSY|DRQ -> DRQ)\n", w_name());
return(ERR);
}
wn->w_status |= STATUS_ADMBSY; /* Command not at all done yet. */
/* Send the command packet to the device. */
if ((s=sys_outsw(wn->base_cmd + REG_DATA, SELF, packet, ATAPI_PACKETSIZE)) != OK)
panic("sys_outsw() failed: %d", s);
return(OK);
}
/*===========================================================================*
* w_ioctl *
*===========================================================================*/
static int w_ioctl(devminor_t minor, unsigned long request, endpoint_t endpt,
cp_grant_id_t grant, endpoint_t UNUSED(user_endpt))
{
int r, timeout, prev, count;
struct command cmd;
switch (request) {
case DIOCTIMEOUT:
r= sys_safecopyfrom(endpt, grant, 0, (vir_bytes)&timeout,
sizeof(timeout));
if(r != OK)
return r;
if (timeout == 0) {
/* Restore defaults. */
timeout_usecs = DEF_TIMEOUT_USECS;
max_errors = MAX_ERRORS;
wakeup_ticks = WAKEUP_TICKS;
w_silent = 0;
} else if (timeout < 0) {
return EINVAL;
} else {
prev = wakeup_ticks;
if (!w_standard_timeouts) {
/* Set (lower) timeout, lower error
* tolerance and set silent mode.
*/
wakeup_ticks = timeout;
max_errors = 3;
w_silent = 1;
timeout = timeout * 1000000 / sys_hz();
if (timeout_usecs > timeout)
timeout_usecs = timeout;
}
r= sys_safecopyto(endpt, grant, 0, (vir_bytes)&prev,
sizeof(prev));
if(r != OK)
return r;
}
return OK;
case DIOCOPENCT:
if (w_prepare(minor) == NULL) return ENXIO;
count = w_wn->open_ct;
r= sys_safecopyto(endpt, grant, 0, (vir_bytes)&count,
sizeof(count));
if(r != OK)
return r;
return OK;
case DIOCFLUSH:
if (w_prepare(minor) == NULL) return ENXIO;
if (w_wn->state & ATAPI) return EINVAL;
if (!(w_wn->state & INITIALIZED) && w_specify() != OK)
return EIO;
cmd.command = CMD_FLUSH_CACHE;
if (com_simple(&cmd) != OK || !w_waitfor(STATUS_BSY, 0))
return EIO;
return (w_wn->w_status & (STATUS_ERR|STATUS_WF)) ? EIO : OK;
}
return ENOTTY;
}
/*===========================================================================*
* w_hw_int *
*===========================================================================*/
static void w_hw_int(unsigned int UNUSED(irqs))
{
/* Leftover interrupt(s) received; ack it/them. For native drives only. */
unsigned int drive;
u32_t w_status;
for (drive = 0; drive < MAX_DRIVES; drive++) {
if (!(wini[drive].state & IGNORING) && wini[drive].native) {
if (sys_inb((wini[drive].base_cmd + REG_STATUS),
&w_status) != OK)
{
panic("couldn't ack irq on drive: %d", drive);
}
wini[drive].w_status= w_status;
sys_inb(wini[drive].base_dma + DMA_STATUS, &w_status);
if(w_status & DMA_ST_INT) {
sys_outb(wini[drive].base_dma + DMA_STATUS, DMA_ST_INT);
wini[drive].dma_intseen = 1;
}
if (sys_irqenable(&wini[drive].irq_hook_id) != OK)
printf("couldn't re-enable drive %d\n", drive);
}
}
}
#define STSTR(a) if (status & STATUS_ ## a) strlcat(str, #a " ", sizeof(str));
#define ERRSTR(a) if (e & ERROR_ ## a) strlcat(str, #a " ", sizeof(str));
static char *strstatus(int status)
{
static char str[200];
str[0] = '\0';
STSTR(BSY);
STSTR(DRDY);
STSTR(DMADF);
STSTR(SRVCDSC);
STSTR(DRQ);
STSTR(CORR);
STSTR(CHECK);
return str;
}
static char *strerr(int e)
{
static char str[200];
str[0] = '\0';
ERRSTR(BB);
ERRSTR(ECC);
ERRSTR(ID);
ERRSTR(AC);
ERRSTR(TK);
ERRSTR(DM);
return str;
}
/*===========================================================================*
* atapi_intr_wait *
*===========================================================================*/
static int atapi_intr_wait(int UNUSED(do_dma), size_t UNUSED(max))
{
/* Wait for an interrupt and study the results. Returns a number of bytes
* that need to be transferred, or an error code.
*/
struct wini *wn = w_wn;
pvb_pair_t inbyte[4]; /* vector for sys_vinb() */
int s; /* status for sys_vinb() */
int e;
int len;
int irr;
int r;
int phase;
w_intr_wait();
/* Request series of device I/O. */
inbyte[0].port = wn->base_cmd + REG_ERROR;
inbyte[1].port = wn->base_cmd + REG_CNT_LO;
inbyte[2].port = wn->base_cmd + REG_CNT_HI;
inbyte[3].port = wn->base_cmd + REG_IRR;
if ((s=sys_vinb(inbyte, 4)) != OK)
panic("ATAPI failed sys_vinb(): %d", s);
e = inbyte[0].value;
len = inbyte[1].value;
len |= inbyte[2].value << 8;
irr = inbyte[3].value;
if (wn->w_status & (STATUS_BSY | STATUS_CHECK)) {
if (atapi_debug) {
printf("atapi fail: S=%x=%s E=%02x=%s L=%04x I=%02x\n", wn->w_status, strstatus(wn->w_status), e, strerr(e), len, irr);
}
return ERR;
}
phase = (wn->w_status & STATUS_DRQ) | (irr & (IRR_COD | IRR_IO));
switch (phase) {
case IRR_COD | IRR_IO:
if (ATAPI_DEBUG) printf("ACD: Phase Command Complete\n");
r = OK;
break;
case 0:
if (ATAPI_DEBUG) printf("ACD: Phase Command Aborted\n");
r = ERR;
break;
case STATUS_DRQ | IRR_COD:
if (ATAPI_DEBUG) printf("ACD: Phase Command Out\n");
r = ERR;
break;
case STATUS_DRQ:
if (ATAPI_DEBUG) printf("ACD: Phase Data Out %d\n", len);
r = len;
break;
case STATUS_DRQ | IRR_IO:
if (ATAPI_DEBUG) printf("ACD: Phase Data In %d\n", len);
r = len;
break;
default:
if (ATAPI_DEBUG) printf("ACD: Phase Unknown\n");
r = ERR;
break;
}
wn->w_status |= STATUS_ADMBSY; /* Assume not done yet. */
return(r);
}
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