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-rw-r--r--src/pc80/ide/ide.c513
1 files changed, 513 insertions, 0 deletions
diff --git a/src/pc80/ide/ide.c b/src/pc80/ide/ide.c
new file mode 100644
index 0000000000..823c5b5b6d
--- /dev/null
+++ b/src/pc80/ide/ide.c
@@ -0,0 +1,513 @@
+#define BSY_SET_DURING_SPINUP 1
+/*
+ * UBL, The Universal Talkware Boot Loader
+ * Copyright (C) 2000 Universal Talkware Inc.
+ * Copyright (C) 2002 Eric Biederman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *
+ */
+
+#include <arch/io.h>
+#include <printk.h>
+#include <string.h>
+#include <delay.h>
+#include <pci.h>
+#include <pc80/ide.h>
+#include <arch/io.h>
+
+struct controller controller;
+struct harddisk_info harddisk_info[NUM_HD];
+
+static int await_ide(int (*done)(struct controller *ctrl),
+ struct controller *ctrl, unsigned long timeout)
+{
+ int result;
+ for(;;) {
+ result = done(ctrl);
+ if (result) {
+ return 0;
+ }
+ if (timeout-- <= 0) {
+ break;
+ }
+ udelay(1000); /* Added to avoid spinning GRW */
+ }
+ return -1;
+}
+
+/* The maximum time any IDE command can last 31 seconds,
+ * So if any IDE commands takes this long we know we have problems.
+ */
+#define IDE_TIMEOUT (32*1000)
+
+static int not_bsy(struct controller *ctrl)
+{
+ return !(inb(IDE_REG_STATUS(ctrl)) & IDE_STATUS_BSY);
+}
+#if !BSY_SET_DURING_SPINUP
+static int timeout(struct controller *ctrl)
+{
+ return 0;
+}
+#endif
+
+static int ide_software_reset(struct controller *ctrl)
+{
+ /* Wait a little bit in case this is immediately after
+ * hardware reset.
+ */
+ udelay(2000);
+ /* A software reset should not be delivered while the bsy bit
+ * is set. If the bsy bit does not clear in a reasonable
+ * amount of time give up.
+ */
+ if (await_ide(not_bsy, ctrl, IDE_TIMEOUT) < 0) {
+ return -1;
+ }
+
+ /* Disable Interrupts and reset the ide bus */
+ outb(IDE_CTRL_HD15 | IDE_CTRL_SRST | IDE_CTRL_NIEN,
+ IDE_REG_DEVICE_CONTROL(ctrl));
+ udelay(5);
+ outb(IDE_CTRL_HD15 | IDE_CTRL_NIEN, IDE_REG_DEVICE_CONTROL(ctrl));
+ udelay(2000);
+ if (await_ide(not_bsy, ctrl, IDE_TIMEOUT) < 0) {
+ return -1;
+ }
+ return 0;
+}
+
+static void pio_set_registers(
+ struct controller *ctrl, const struct ide_pio_command *cmd)
+{
+ uint8_t device;
+ /* Disable Interrupts */
+ outb(IDE_CTRL_HD15 | IDE_CTRL_NIEN, IDE_REG_DEVICE_CONTROL(ctrl));
+
+ /* Possibly switch selected device */
+ device = inb(IDE_REG_DEVICE(ctrl));
+ outb(cmd->device, IDE_REG_DEVICE(ctrl));
+ if ((device & (1UL << 4)) != (cmd->device & (1UL << 4))) {
+ /* Allow time for the selected drive to switch,
+ * The linux ide code suggests 50ms is the right
+ * amount of time to use here.
+ */
+ udelay(50000);
+ }
+ outb(cmd->feature, IDE_REG_FEATURE(ctrl));
+ outb(cmd->sector_count2, IDE_REG_SECTOR_COUNT(ctrl));
+ outb(cmd->sector_count, IDE_REG_SECTOR_COUNT(ctrl));
+ outb(cmd->lba_low2, IDE_REG_LBA_LOW(ctrl));
+ outb(cmd->lba_low, IDE_REG_LBA_LOW(ctrl));
+ outb(cmd->lba_mid2, IDE_REG_LBA_MID(ctrl));
+ outb(cmd->lba_mid, IDE_REG_LBA_MID(ctrl));
+ outb(cmd->lba_high2, IDE_REG_LBA_HIGH(ctrl));
+ outb(cmd->lba_high, IDE_REG_LBA_HIGH(ctrl));
+ outb(cmd->command, IDE_REG_COMMAND(ctrl));
+}
+
+
+static int pio_non_data(struct controller *ctrl, const struct ide_pio_command *cmd)
+{
+ /* Wait until the busy bit is clear */
+ if (await_ide(not_bsy, ctrl, IDE_TIMEOUT) < 0) {
+ return -1;
+ }
+
+ pio_set_registers(ctrl, cmd);
+ if (await_ide(not_bsy, ctrl, IDE_TIMEOUT) < 0) {
+ return -1;
+ }
+ /* FIXME is there more error checking I could do here? */
+ return 0;
+}
+
+static int pio_data_in(struct controller *ctrl, const struct ide_pio_command *cmd,
+ void *buffer, size_t bytes)
+{
+ unsigned int status;
+
+ /* FIXME handle commands with multiple blocks */
+ /* Wait until the busy bit is clear */
+ if (await_ide(not_bsy, ctrl, IDE_TIMEOUT) < 0) {
+ return -1;
+ }
+
+ /* How do I tell if INTRQ is asserted? */
+ pio_set_registers(ctrl, cmd);
+ if (await_ide(not_bsy, ctrl, IDE_TIMEOUT) < 0) {
+ return -1;
+ }
+ status = inb(IDE_REG_STATUS(ctrl));
+ if (!(status & IDE_STATUS_DRQ)) {
+ return -1;
+ }
+ insw(IDE_REG_DATA(ctrl), buffer, bytes/2);
+ status = inb(IDE_REG_STATUS(ctrl));
+ if (status & IDE_STATUS_ERR) {
+ return -1;
+ }
+ return 0;
+}
+
+static inline int ide_read_sector_chs(
+ struct harddisk_info *info, void *buffer, unsigned long sector)
+{
+ struct ide_pio_command cmd;
+ unsigned int track;
+ unsigned int offset;
+ unsigned int cylinder;
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.sector_count = 1;
+
+ track = sector / info->sectors_per_track;
+ /* Sector number */
+ offset = 1 + (sector % info->sectors_per_track);
+ cylinder = track / info->heads;
+ cmd.lba_low = offset;
+ cmd.lba_mid = cylinder & 0xff;
+ cmd.lba_high = (cylinder >> 8) & 0xff;
+ cmd.device = IDE_DH_DEFAULT |
+ IDE_DH_HEAD(track % info->heads) |
+ info->slave |
+ IDE_DH_CHS;
+ cmd.command = IDE_CMD_READ_SECTORS;
+ return pio_data_in(info->ctrl, &cmd, buffer, IDE_SECTOR_SIZE);
+}
+
+static inline int ide_read_sector_lba(
+ struct harddisk_info *info, void *buffer, unsigned long sector)
+{
+ struct ide_pio_command cmd;
+ memset(&cmd, 0, sizeof(cmd));
+
+ cmd.sector_count = 1;
+ cmd.lba_low = sector & 0xff;
+ cmd.lba_mid = (sector >> 8) & 0xff;
+ cmd.lba_high = (sector >> 16) & 0xff;
+ cmd.device = IDE_DH_DEFAULT |
+ ((sector >> 24) & 0x0f) |
+ info->slave |
+ IDE_DH_LBA;
+ cmd.command = IDE_CMD_READ_SECTORS;
+ return pio_data_in(info->ctrl, &cmd, buffer, IDE_SECTOR_SIZE);
+}
+
+static inline int ide_read_sector_lba48(
+ struct harddisk_info *info, void *buffer, sector_t sector)
+{
+ struct ide_pio_command cmd;
+ memset(&cmd, 0, sizeof(cmd));
+
+ cmd.sector_count = 1;
+ cmd.lba_low = sector & 0xff;
+ cmd.lba_mid = (sector >> 8) & 0xff;
+ cmd.lba_high = (sector >> 16) & 0xff;
+ cmd.lba_low2 = (sector >> 24) & 0xff;
+ cmd.lba_mid2 = (sector >> 32) & 0xff;
+ cmd.lba_high2 = (sector >> 40) & 0xff;
+ cmd.device = info->slave | IDE_DH_LBA;
+ cmd.command = IDE_CMD_READ_SECTORS_EXT;
+ return pio_data_in(info->ctrl, &cmd, buffer, IDE_SECTOR_SIZE);
+}
+
+int ide_read_sector(int driveno, void * buf, unsigned int sector,
+ int byte_offset, int n_bytes)
+{
+ struct harddisk_info *info = &harddisk_info[driveno];
+ int result;
+
+ /* Report the buffer is empty */
+ if (sector > info->sectors) {
+ return -1;
+ }
+ if (info->address_mode == ADDRESS_MODE_CHS) {
+ result = ide_read_sector_chs(info, buf, sector);
+ }
+ else if (info->address_mode == ADDRESS_MODE_LBA) {
+ result = ide_read_sector_lba(info, buf, sector);
+ }
+ else if (info->address_mode == ADDRESS_MODE_LBA48) {
+ result = ide_read_sector_lba48(info, buf, sector);
+ }
+ else {
+ result = -1;
+ }
+ return result;
+}
+
+static int init_drive(struct harddisk_info *info, struct controller *ctrl, int slave, int basedrive)
+{
+ uint16_t* drive_info;
+ struct ide_pio_command cmd;
+ unsigned char disk_buffer[DISK_BUFFER_SIZE];
+ int i;
+
+ info->ctrl = ctrl;
+ info->heads = 0u;
+ info->cylinders = 0u;
+ info->sectors_per_track = 0u;
+ info->address_mode = IDE_DH_CHS;
+ info->sectors = 0ul;
+ info->drive_exists = 0;
+ info->slave_absent = 0;
+ info->slave = slave?IDE_DH_SLAVE: IDE_DH_MASTER;
+ info->basedrive = basedrive;
+
+ printk_info("Testing for disk %d\n", info->basedrive);
+
+ /* Select the drive that we are testing */
+ outb(IDE_DH_DEFAULT | IDE_DH_HEAD(0) | IDE_DH_CHS | info->slave,
+ IDE_REG_DEVICE(ctrl));
+ udelay(50000);
+
+ /* Test to see if the drive registers exist,
+ * In many cases this quickly rules out a missing drive.
+ */
+ for(i = 0; i < 4; i++) {
+ outb(0xaa + i, (ctrl->cmd_base) + 2 + i);
+ }
+ for(i = 0; i < 4; i++) {
+ if (inb((ctrl->cmd_base) + 2 + i) != 0xaa + i) {
+ return 1;
+ }
+ }
+ for(i = 0; i < 4; i++) {
+ outb(0x55 + i, (ctrl->cmd_base) + 2 + i);
+ }
+ for(i = 0; i < 4; i++) {
+ if (inb((ctrl->cmd_base) + 2 + i) != 0x55 + i) {
+ return 1;
+ }
+ }
+
+ printk_info("Probing for disk %d\n", info->basedrive);
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.device = IDE_DH_DEFAULT | IDE_DH_HEAD(0) | IDE_DH_CHS | info->slave;
+ cmd.command = IDE_CMD_IDENTIFY_DEVICE;
+
+
+ if (pio_data_in(ctrl, &cmd, disk_buffer, IDE_SECTOR_SIZE) < 0) {
+ /* Well, if that command didn't work, we probably don't have drive. */
+ return 1;
+ }
+
+
+ /* Now suck the data out */
+ drive_info = (uint16_t *)disk_buffer;
+ if (drive_info[2] == 0x37C8) {
+ /* If the response is incomplete spin up the drive... */
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.device = IDE_DH_DEFAULT | IDE_DH_HEAD(0) | IDE_DH_CHS |
+ info->slave;
+ cmd.feature = IDE_FEATURE_STANDBY_SPINUP_DRIVE;
+ if (pio_non_data(ctrl, &cmd) < 0) {
+ /* If the command doesn't work give up on the drive */
+ return 1;
+ }
+
+ }
+ if ((drive_info[2] == 0x37C8) || (drive_info[2] == 0x8C73)) {
+ /* The response is incomplete retry the drive info command */
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.device = IDE_DH_DEFAULT | IDE_DH_HEAD(0) | IDE_DH_CHS |
+ info->slave;
+ cmd.command = IDE_CMD_IDENTIFY_DEVICE;
+ if(pio_data_in(ctrl, &cmd, disk_buffer, IDE_SECTOR_SIZE) < 0) {
+ /* If the command didn't work give up on the drive. */
+ return 1;
+ }
+ }
+ if ((drive_info[2] != 0x37C8) &&
+ (drive_info[2] != 0x738C) &&
+ (drive_info[2] != 0x8C73) &&
+ (drive_info[2] != 0xC837) &&
+ (drive_info[2] != 0x0000)) {
+ printk_info("Invalid IDE Configuration: %hx\n", drive_info[2]);
+ return 1;
+ }
+ for(i = 27; i < 47; i++) {
+ info->model_number[((i-27)<< 1)] = (drive_info[i] >> 8) & 0xff;
+ info->model_number[((i-27)<< 1)+1] = drive_info[i] & 0xff;
+ }
+ info->model_number[40] = '\0';
+ info->drive_exists = 1;
+
+ /* See if LBA is supported */
+ if (drive_info[49] & (1 << 9)) {
+ info->address_mode = ADDRESS_MODE_LBA;
+ info->sectors = (drive_info[61] << 16) | (drive_info[60]);
+ /* Enable LBA48 mode if it is present */
+ if (drive_info[83] & (1 <<10)) {
+ /* Should LBA48 depend on LBA? */
+ printk_info("LBA48 mode\n");
+ info->address_mode = ADDRESS_MODE_LBA48;
+ info->sectors =
+ (((sector_t)drive_info[103]) << 48) |
+ (((sector_t)drive_info[102]) << 32) |
+ (((sector_t)drive_info[101]) << 16) |
+ (((sector_t)drive_info[100]) << 0);
+ }
+ } else {
+ info->address_mode = ADDRESS_MODE_CHS;
+ info->heads = drive_info[3];
+ info->cylinders = drive_info[1];
+ info->sectors_per_track = drive_info[6];
+ info->sectors =
+ info->sectors_per_track *
+ info->heads *
+ info->cylinders;
+ printk_info("%s sectors_per_track=[%d], heads=[%d], cylinders=[%d]\n",
+ __FUNCTION__,
+ info->sectors_per_track,
+ info->heads,
+ info->cylinders);
+ }
+ /* See if we have a slave */
+ if (!info->slave && (((drive_info[93] >> 14) & 3) == 1)) {
+ info->slave_absent = !(drive_info[93] & (1 << 5));
+ }
+ /* See if we need to put the device in CFA power mode 1 */
+ if ((drive_info[160] & ((1 << 15) | (1 << 13)| (1 << 12))) ==
+ ((1 << 15) | (1 << 13)| (1 << 12))) {
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.device = IDE_DH_DEFAULT | IDE_DH_HEAD(0) | IDE_DH_CHS | info->slave;
+ cmd.feature = IDE_FEATURE_CFA_ENABLE_POWER_MODE1;
+ if (pio_non_data(ctrl, &cmd) < 0) {
+ /* If I need to power up the drive, and I can't
+ * give up.
+ */
+ printk_info("Cannot power up CFA device\n");
+ return 1;
+ }
+ }
+ printk_info("disk%d %dk cap: %hx\n",
+ info->basedrive,
+ (unsigned long)(info->sectors >> 1),
+ drive_info[49]);
+ return 0;
+}
+
+static int init_controller(struct controller *ctrl, int basedrive)
+{
+ struct harddisk_info *info;
+
+ /* Put the drives ide channel in a know state and wait
+ * for the drives to spinup.
+ *
+ * In practice IDE disks tend not to respond to commands until
+ * they have spun up. This makes IDE hard to deal with
+ * immediately after power up, as the delays can be quite
+ * long, so we must be very careful here.
+ *
+ * There are two pathological cases that must be dealt with:
+ *
+ * - The BSY bit not being set while the IDE drives spin up.
+ * In this cases only a hard coded delay will work. As
+ * I have not reproduced it, and this is out of spec for
+ * IDE drives the work around can be enabled by setting
+ * BSY_SET_DURING_SPINUP to 0.
+ *
+ * - The BSY bit floats high when no drives are plugged in.
+ * This case will not be detected except by timing out but
+ * we avoid the problems by only probing devices we are
+ * supposed to boot from. If we don't do the probe we
+ * will not experience the problem.
+ *
+ * So speed wise I am only slow if the BSY bit is not set
+ * or not reported by the IDE controller during spinup, which
+ * is quite rare.
+ *
+ */
+#if !BSY_SET_DURING_SPINUP
+ if (await_ide(timeout, ctrl, IDE_TIMEOUT) < 0) {
+ return -1;
+ }
+#endif
+ if (ide_software_reset(ctrl) < 0) {
+ return -1;
+ }
+
+ /* Note: I have just done a software reset. It may be
+ * reasonable to just read the boot time signatures
+ * off of the drives to see if they are present.
+ *
+ * For now I will go with just sending commands to the drives
+ * and assuming filtering out missing drives by detecting registers
+ * that won't set and commands that fail to execute properly.
+ */
+
+ /* Now initialize the individual drives */
+ info = &harddisk_info[basedrive];
+ init_drive(info, ctrl, 0, basedrive & 1);
+
+ /* at the moment this only works for the first drive */
+#if 0
+ if (info->drive_exists && !info->slave_absent) {
+ basedrive++;
+ info++;
+ init_drive(info, ctrl, 1, basedrive & 1);
+ }
+#endif
+
+ return 0;
+}
+
+int ide_init(void)
+{
+ int index;
+ int drives = 0;
+
+ /* Intialize the harddisk_info structures */
+ memset(harddisk_info, 0, sizeof(harddisk_info));
+
+ for(index = 0; index < 1; index++) {
+#if 0
+ /* IDE normal pci mode */
+ unsigned cmd_reg, ctrl_reg;
+ uint32_t cmd_base, ctrl_base;
+ if (index < 2) {
+ cmd_reg = PCI_BASE_ADDRESS_0;
+ ctrl_reg = PCI_BASE_ADDRESS_1;
+ } else {
+ cmd_reg = PCI_BASE_ADDRESS_2;
+ ctrl_reg = PCI_BASE_ADDRESS_3;
+ }
+ pcibios_read_config_dword(0, 0, cmd_reg, &cmd_base);
+ pcibios_read_config_dword(0, 0, ctrl_reg, &ctrl_base);
+ controller.cmd_base = cmd_base & ~3;
+ controller.ctrl_base = ctrl_base & ~3;
+
+#endif
+ uint16_t base;
+ base = (index < 1)?IDE_BASE0:IDE_BASE1;
+ controller.cmd_base = base;
+ controller.ctrl_base = base + IDE_REG_EXTENDED_OFFSET;
+
+ printk_info("init_controller %d at (%x, %x)\n", index, controller.cmd_base, controller.ctrl_base);
+
+ if (init_controller(&controller, index << 1) < 0) {
+ /* nothing behind the controller */
+ continue;
+ }
+ drives++;
+ }
+
+ return drives > 0 ? 0 : -1;
+}
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