--- /dev/null
+// Low level AHCI disk access
+//
+// Copyright (C) 2010 Gerd Hoffmann <kraxel@redhat.com>
+//
+// This file may be distributed under the terms of the GNU LGPLv3 license.
+
+#include "ahci.h" // CDB_CMD_READ_10
+#include "ata.h" // ATA_CB_STAT
+#include "biosvar.h" // GET_GLOBAL
+#include "blockcmd.h" // CDB_CMD_READ_10
+#include "malloc.h" // free
+#include "output.h" // dprintf
+#include "pci.h" // foreachpci
+#include "pci_ids.h" // PCI_CLASS_STORAGE_OTHER
+#include "pci_regs.h" // PCI_INTERRUPT_LINE
+#include "stacks.h" // yield
+#include "std/disk.h" // DISK_RET_SUCCESS
+#include "string.h" // memset
+#include "util.h" // timer_calc
+#include "x86.h" // inb
+
+#define AHCI_REQUEST_TIMEOUT 32000 // 32 seconds max for IDE ops
+#define AHCI_RESET_TIMEOUT 500 // 500 miliseconds
+#define AHCI_LINK_TIMEOUT 10 // 10 miliseconds
+
+// prepare sata command fis
+static void sata_prep_simple(struct sata_cmd_fis *fis, u8 command)
+{
+ memset_fl(fis, 0, sizeof(*fis));
+ fis->command = command;
+}
+
+static void sata_prep_readwrite(struct sata_cmd_fis *fis,
+ struct disk_op_s *op, int iswrite)
+{
+ u64 lba = op->lba;
+ u8 command;
+
+ memset_fl(fis, 0, sizeof(*fis));
+
+ if (op->count >= (1<<8) || lba + op->count >= (1<<28)) {
+ fis->sector_count2 = op->count >> 8;
+ fis->lba_low2 = lba >> 24;
+ fis->lba_mid2 = lba >> 32;
+ fis->lba_high2 = lba >> 40;
+ lba &= 0xffffff;
+ command = (iswrite ? ATA_CMD_WRITE_DMA_EXT
+ : ATA_CMD_READ_DMA_EXT);
+ } else {
+ command = (iswrite ? ATA_CMD_WRITE_DMA
+ : ATA_CMD_READ_DMA);
+ }
+ fis->feature = 1; /* dma */
+ fis->command = command;
+ fis->sector_count = op->count;
+ fis->lba_low = lba;
+ fis->lba_mid = lba >> 8;
+ fis->lba_high = lba >> 16;
+ fis->device = ((lba >> 24) & 0xf) | ATA_CB_DH_LBA;
+}
+
+static void sata_prep_atapi(struct sata_cmd_fis *fis, u16 blocksize)
+{
+ memset_fl(fis, 0, sizeof(*fis));
+ fis->command = ATA_CMD_PACKET;
+ fis->feature = 1; /* dma */
+ fis->lba_mid = blocksize;
+ fis->lba_high = blocksize >> 8;
+}
+
+// ahci register access helpers
+static u32 ahci_ctrl_readl(struct ahci_ctrl_s *ctrl, u32 reg)
+{
+ u32 addr = ctrl->iobase + reg;
+ return readl((void*)addr);
+}
+
+static void ahci_ctrl_writel(struct ahci_ctrl_s *ctrl, u32 reg, u32 val)
+{
+ u32 addr = ctrl->iobase + reg;
+ writel((void*)addr, val);
+}
+
+static u32 ahci_port_to_ctrl(u32 pnr, u32 port_reg)
+{
+ u32 ctrl_reg = 0x100;
+ ctrl_reg += pnr * 0x80;
+ ctrl_reg += port_reg;
+ return ctrl_reg;
+}
+
+static u32 ahci_port_readl(struct ahci_ctrl_s *ctrl, u32 pnr, u32 reg)
+{
+ u32 ctrl_reg = ahci_port_to_ctrl(pnr, reg);
+ return ahci_ctrl_readl(ctrl, ctrl_reg);
+}
+
+static void ahci_port_writel(struct ahci_ctrl_s *ctrl, u32 pnr, u32 reg, u32 val)
+{
+ u32 ctrl_reg = ahci_port_to_ctrl(pnr, reg);
+ ahci_ctrl_writel(ctrl, ctrl_reg, val);
+}
+
+// submit ahci command + wait for result
+static int ahci_command(struct ahci_port_s *port_gf, int iswrite, int isatapi,
+ void *buffer, u32 bsize)
+{
+ u32 val, status, success, flags, intbits, error;
+ struct ahci_ctrl_s *ctrl = port_gf->ctrl;
+ struct ahci_cmd_s *cmd = port_gf->cmd;
+ struct ahci_fis_s *fis = port_gf->fis;
+ struct ahci_list_s *list = port_gf->list;
+ u32 pnr = port_gf->pnr;
+
+ cmd->fis.reg = 0x27;
+ cmd->fis.pmp_type = 1 << 7; /* cmd fis */
+ cmd->prdt[0].base = (u32)buffer;
+ cmd->prdt[0].baseu = 0;
+ cmd->prdt[0].flags = bsize-1;
+
+ flags = ((1 << 16) | /* one prd entry */
+ (iswrite ? (1 << 6) : 0) |
+ (isatapi ? (1 << 5) : 0) |
+ (5 << 0)); /* fis length (dwords) */
+ list[0].flags = flags;
+ list[0].bytes = 0;
+ list[0].base = (u32)(cmd);
+ list[0].baseu = 0;
+
+ dprintf(8, "AHCI/%d: send cmd ...\n", pnr);
+ intbits = ahci_port_readl(ctrl, pnr, PORT_IRQ_STAT);
+ if (intbits)
+ ahci_port_writel(ctrl, pnr, PORT_IRQ_STAT, intbits);
+ ahci_port_writel(ctrl, pnr, PORT_SCR_ACT, 1);
+ ahci_port_writel(ctrl, pnr, PORT_CMD_ISSUE, 1);
+
+ u32 end = timer_calc(AHCI_REQUEST_TIMEOUT);
+ do {
+ for (;;) {
+ intbits = ahci_port_readl(ctrl, pnr, PORT_IRQ_STAT);
+ if (intbits) {
+ ahci_port_writel(ctrl, pnr, PORT_IRQ_STAT, intbits);
+ if (intbits & 0x02) {
+ status = GET_LOWFLAT(fis->psfis[2]);
+ error = GET_LOWFLAT(fis->psfis[3]);
+ break;
+ }
+ if (intbits & 0x01) {
+ status = GET_LOWFLAT(fis->rfis[2]);
+ error = GET_LOWFLAT(fis->rfis[3]);
+ break;
+ }
+ }
+ if (timer_check(end)) {
+ warn_timeout();
+ return -1;
+ }
+ yield();
+ }
+ dprintf(8, "AHCI/%d: ... intbits 0x%x, status 0x%x ...\n",
+ pnr, intbits, status);
+ } while (status & ATA_CB_STAT_BSY);
+
+ success = (0x00 == (status & (ATA_CB_STAT_BSY | ATA_CB_STAT_DF |
+ ATA_CB_STAT_ERR)) &&
+ ATA_CB_STAT_RDY == (status & (ATA_CB_STAT_RDY)));
+ if (success) {
+ dprintf(8, "AHCI/%d: ... finished, status 0x%x, OK\n", pnr,
+ status);
+ } else {
+ dprintf(2, "AHCI/%d: ... finished, status 0x%x, ERROR 0x%x\n", pnr,
+ status, error);
+
+ // non-queued error recovery (AHCI 1.3 section 6.2.2.1)
+ // Clears PxCMD.ST to 0 to reset the PxCI register
+ val = ahci_port_readl(ctrl, pnr, PORT_CMD);
+ ahci_port_writel(ctrl, pnr, PORT_CMD, val & ~PORT_CMD_START);
+
+ // waits for PxCMD.CR to clear to 0
+ while (1) {
+ val = ahci_port_readl(ctrl, pnr, PORT_CMD);
+ if ((val & PORT_CMD_LIST_ON) == 0)
+ break;
+ yield();
+ }
+
+ // Clears any error bits in PxSERR to enable capturing new errors
+ val = ahci_port_readl(ctrl, pnr, PORT_SCR_ERR);
+ ahci_port_writel(ctrl, pnr, PORT_SCR_ERR, val);
+
+ // Clears status bits in PxIS as appropriate
+ val = ahci_port_readl(ctrl, pnr, PORT_IRQ_STAT);
+ ahci_port_writel(ctrl, pnr, PORT_IRQ_STAT, val);
+
+ // If PxTFD.STS.BSY or PxTFD.STS.DRQ is set to 1, issue
+ // a COMRESET to the device to put it in an idle state
+ val = ahci_port_readl(ctrl, pnr, PORT_TFDATA);
+ if (val & (ATA_CB_STAT_BSY | ATA_CB_STAT_DRQ)) {
+ dprintf(2, "AHCI/%d: issue comreset\n", pnr);
+ val = ahci_port_readl(ctrl, pnr, PORT_SCR_CTL);
+ // set Device Detection Initialization (DET) to 1 for 1 ms for comreset
+ ahci_port_writel(ctrl, pnr, PORT_SCR_CTL, val | 1);
+ mdelay (1);
+ ahci_port_writel(ctrl, pnr, PORT_SCR_CTL, val);
+ }
+
+ // Sets PxCMD.ST to 1 to enable issuing new commands
+ val = ahci_port_readl(ctrl, pnr, PORT_CMD);
+ ahci_port_writel(ctrl, pnr, PORT_CMD, val | PORT_CMD_START);
+ }
+ return success ? 0 : -1;
+}
+
+#define CDROM_CDB_SIZE 12
+
+int ahci_cmd_data(struct disk_op_s *op, void *cdbcmd, u16 blocksize)
+{
+ if (! CONFIG_AHCI)
+ return 0;
+
+ struct ahci_port_s *port_gf = container_of(
+ op->drive_gf, struct ahci_port_s, drive);
+ struct ahci_cmd_s *cmd = port_gf->cmd;
+ u8 *atapi = cdbcmd;
+ int i, rc;
+
+ sata_prep_atapi(&cmd->fis, blocksize);
+ for (i = 0; i < CDROM_CDB_SIZE; i++) {
+ cmd->atapi[i] = atapi[i];
+ }
+ rc = ahci_command(port_gf, 0, 1, op->buf_fl,
+ op->count * blocksize);
+ if (rc < 0)
+ return DISK_RET_EBADTRACK;
+ return DISK_RET_SUCCESS;
+}
+
+// read/write count blocks from a harddrive, op->buf_fl must be word aligned
+static int
+ahci_disk_readwrite_aligned(struct disk_op_s *op, int iswrite)
+{
+ struct ahci_port_s *port_gf = container_of(
+ op->drive_gf, struct ahci_port_s, drive);
+ struct ahci_cmd_s *cmd = port_gf->cmd;
+ int rc;
+
+ sata_prep_readwrite(&cmd->fis, op, iswrite);
+ rc = ahci_command(port_gf, iswrite, 0, op->buf_fl,
+ op->count * DISK_SECTOR_SIZE);
+ dprintf(8, "ahci disk %s, lba %6x, count %3x, buf %p, rc %d\n",
+ iswrite ? "write" : "read", (u32)op->lba, op->count, op->buf_fl, rc);
+ if (rc < 0)
+ return DISK_RET_EBADTRACK;
+ return DISK_RET_SUCCESS;
+}
+
+// read/write count blocks from a harddrive.
+static int
+ahci_disk_readwrite(struct disk_op_s *op, int iswrite)
+{
+ // if caller's buffer is word aligned, use it directly
+ if (((u32) op->buf_fl & 1) == 0)
+ return ahci_disk_readwrite_aligned(op, iswrite);
+
+ // Use a word aligned buffer for AHCI I/O
+ int rc;
+ struct disk_op_s localop = *op;
+ u8 *alignedbuf_fl = bounce_buf_fl;
+ u8 *position = op->buf_fl;
+
+ localop.buf_fl = alignedbuf_fl;
+ localop.count = 1;
+
+ if (iswrite) {
+ u16 block;
+ for (block = 0; block < op->count; block++) {
+ memcpy_fl (alignedbuf_fl, position, DISK_SECTOR_SIZE);
+ rc = ahci_disk_readwrite_aligned (&localop, 1);
+ if (rc)
+ return rc;
+ position += DISK_SECTOR_SIZE;
+ localop.lba++;
+ }
+ } else { // read
+ u16 block;
+ for (block = 0; block < op->count; block++) {
+ rc = ahci_disk_readwrite_aligned (&localop, 0);
+ if (rc)
+ return rc;
+ memcpy_fl (position, alignedbuf_fl, DISK_SECTOR_SIZE);
+ position += DISK_SECTOR_SIZE;
+ localop.lba++;
+ }
+ }
+ return DISK_RET_SUCCESS;
+}
+
+// command demuxer
+int VISIBLE32FLAT
+process_ahci_op(struct disk_op_s *op)
+{
+ if (!CONFIG_AHCI)
+ return 0;
+ switch (op->command) {
+ case CMD_READ:
+ return ahci_disk_readwrite(op, 0);
+ case CMD_WRITE:
+ return ahci_disk_readwrite(op, 1);
+ case CMD_FORMAT:
+ case CMD_RESET:
+ case CMD_ISREADY:
+ case CMD_VERIFY:
+ case CMD_SEEK:
+ return DISK_RET_SUCCESS;
+ default:
+ dprintf(1, "AHCI: unknown disk command %d\n", op->command);
+ return DISK_RET_EPARAM;
+ }
+}
+
+static void
+ahci_port_reset(struct ahci_ctrl_s *ctrl, u32 pnr)
+{
+ u32 val;
+
+ /* disable FIS + CMD */
+ u32 end = timer_calc(AHCI_RESET_TIMEOUT);
+ for (;;) {
+ val = ahci_port_readl(ctrl, pnr, PORT_CMD);
+ if (!(val & (PORT_CMD_FIS_RX | PORT_CMD_START |
+ PORT_CMD_FIS_ON | PORT_CMD_LIST_ON)))
+ break;
+ val &= ~(PORT_CMD_FIS_RX | PORT_CMD_START);
+ ahci_port_writel(ctrl, pnr, PORT_CMD, val);
+ if (timer_check(end)) {
+ warn_timeout();
+ break;
+ }
+ yield();
+ }
+
+ /* disable + clear IRQs */
+ ahci_port_writel(ctrl, pnr, PORT_IRQ_MASK, 0);
+ val = ahci_port_readl(ctrl, pnr, PORT_IRQ_STAT);
+ if (val)
+ ahci_port_writel(ctrl, pnr, PORT_IRQ_STAT, val);
+}
+
+static struct ahci_port_s*
+ahci_port_alloc(struct ahci_ctrl_s *ctrl, u32 pnr)
+{
+ struct ahci_port_s *port = malloc_tmp(sizeof(*port));
+
+ if (!port) {
+ warn_noalloc();
+ return NULL;
+ }
+ port->pnr = pnr;
+ port->ctrl = ctrl;
+ port->list = memalign_tmp(1024, 1024);
+ port->fis = memalign_tmp(256, 256);
+ port->cmd = memalign_tmp(256, 256);
+ if (port->list == NULL || port->fis == NULL || port->cmd == NULL) {
+ warn_noalloc();
+ return NULL;
+ }
+ memset(port->list, 0, 1024);
+ memset(port->fis, 0, 256);
+ memset(port->cmd, 0, 256);
+
+ ahci_port_writel(ctrl, pnr, PORT_LST_ADDR, (u32)port->list);
+ ahci_port_writel(ctrl, pnr, PORT_FIS_ADDR, (u32)port->fis);
+ return port;
+}
+
+static void ahci_port_release(struct ahci_port_s *port)
+{
+ ahci_port_reset(port->ctrl, port->pnr);
+ free(port->list);
+ free(port->fis);
+ free(port->cmd);
+ free(port);
+}
+
+static struct ahci_port_s* ahci_port_realloc(struct ahci_port_s *port)
+{
+ struct ahci_port_s *tmp;
+ u32 cmd;
+
+ tmp = malloc_fseg(sizeof(*port));
+ if (!tmp) {
+ warn_noalloc();
+ ahci_port_release(port);
+ return NULL;
+ }
+ *tmp = *port;
+ free(port);
+ port = tmp;
+
+ ahci_port_reset(port->ctrl, port->pnr);
+
+ free(port->list);
+ free(port->fis);
+ free(port->cmd);
+ port->list = memalign_high(1024, 1024);
+ port->fis = memalign_high(256, 256);
+ port->cmd = memalign_high(256, 256);
+
+ ahci_port_writel(port->ctrl, port->pnr, PORT_LST_ADDR, (u32)port->list);
+ ahci_port_writel(port->ctrl, port->pnr, PORT_FIS_ADDR, (u32)port->fis);
+
+ cmd = ahci_port_readl(port->ctrl, port->pnr, PORT_CMD);
+ cmd |= (PORT_CMD_FIS_RX|PORT_CMD_START);
+ ahci_port_writel(port->ctrl, port->pnr, PORT_CMD, cmd);
+
+ return port;
+}
+
+#define MAXMODEL 40
+
+/* See ahci spec chapter 10.1 "Software Initialization of HBA" */
+static int ahci_port_setup(struct ahci_port_s *port)
+{
+ struct ahci_ctrl_s *ctrl = port->ctrl;
+ u32 pnr = port->pnr;
+ char model[MAXMODEL+1];
+ u16 buffer[256];
+ u32 cmd, stat, err, tf;
+ int rc;
+
+ /* enable FIS recv */
+ cmd = ahci_port_readl(ctrl, pnr, PORT_CMD);
+ cmd |= PORT_CMD_FIS_RX;
+ ahci_port_writel(ctrl, pnr, PORT_CMD, cmd);
+
+ /* spin up */
+ cmd |= PORT_CMD_SPIN_UP;
+ ahci_port_writel(ctrl, pnr, PORT_CMD, cmd);
+ u32 end = timer_calc(AHCI_LINK_TIMEOUT);
+ for (;;) {
+ stat = ahci_port_readl(ctrl, pnr, PORT_SCR_STAT);
+ if ((stat & 0x07) == 0x03) {
+ dprintf(2, "AHCI/%d: link up\n", port->pnr);
+ break;
+ }
+ if (timer_check(end)) {
+ dprintf(2, "AHCI/%d: link down\n", port->pnr);
+ return -1;
+ }
+ yield();
+ }
+
+ /* clear error status */
+ err = ahci_port_readl(ctrl, pnr, PORT_SCR_ERR);
+ if (err)
+ ahci_port_writel(ctrl, pnr, PORT_SCR_ERR, err);
+
+ /* wait for device becoming ready */
+ end = timer_calc(AHCI_REQUEST_TIMEOUT);
+ for (;;) {
+ tf = ahci_port_readl(ctrl, pnr, PORT_TFDATA);
+ if (!(tf & (ATA_CB_STAT_BSY |
+ ATA_CB_STAT_DRQ)))
+ break;
+ if (timer_check(end)) {
+ warn_timeout();
+ dprintf(1, "AHCI/%d: device not ready (tf 0x%x)\n", port->pnr, tf);
+ return -1;
+ }
+ yield();
+ }
+
+ /* start device */
+ cmd |= PORT_CMD_START;
+ ahci_port_writel(ctrl, pnr, PORT_CMD, cmd);
+
+ sata_prep_simple(&port->cmd->fis, ATA_CMD_IDENTIFY_PACKET_DEVICE);
+ rc = ahci_command(port, 0, 0, buffer, sizeof(buffer));
+ if (rc == 0) {
+ port->atapi = 1;
+ } else {
+ port->atapi = 0;
+ sata_prep_simple(&port->cmd->fis, ATA_CMD_IDENTIFY_DEVICE);
+ rc = ahci_command(port, 0, 0, buffer, sizeof(buffer));
+ if (rc < 0)
+ return -1;
+ }
+
+ port->drive.cntl_id = pnr;
+ port->drive.removable = (buffer[0] & 0x80) ? 1 : 0;
+
+ if (!port->atapi) {
+ // found disk (ata)
+ port->drive.type = DTYPE_AHCI;
+ port->drive.blksize = DISK_SECTOR_SIZE;
+ port->drive.pchs.cylinder = buffer[1];
+ port->drive.pchs.head = buffer[3];
+ port->drive.pchs.sector = buffer[6];
+
+ u64 sectors;
+ if (buffer[83] & (1 << 10)) // word 83 - lba48 support
+ sectors = *(u64*)&buffer[100]; // word 100-103
+ else
+ sectors = *(u32*)&buffer[60]; // word 60 and word 61
+ port->drive.sectors = sectors;
+ u64 adjsize = sectors >> 11;
+ char adjprefix = 'M';
+ if (adjsize >= (1 << 16)) {
+ adjsize >>= 10;
+ adjprefix = 'G';
+ }
+ port->desc = znprintf(MAXDESCSIZE
+ , "AHCI/%d: %s ATA-%d Hard-Disk (%u %ciBytes)"
+ , port->pnr
+ , ata_extract_model(model, MAXMODEL, buffer)
+ , ata_extract_version(buffer)
+ , (u32)adjsize, adjprefix);
+ port->prio = bootprio_find_ata_device(ctrl->pci_tmp, pnr, 0);
+ } else {
+ // found cdrom (atapi)
+ port->drive.type = DTYPE_AHCI_ATAPI;
+ port->drive.blksize = CDROM_SECTOR_SIZE;
+ port->drive.sectors = (u64)-1;
+ u8 iscd = ((buffer[0] >> 8) & 0x1f) == 0x05;
+ if (!iscd) {
+ dprintf(1, "AHCI/%d: atapi device isn't a cdrom\n", port->pnr);
+ return -1;
+ }
+ port->desc = znprintf(MAXDESCSIZE
+ , "DVD/CD [AHCI/%d: %s ATAPI-%d DVD/CD]"
+ , port->pnr
+ , ata_extract_model(model, MAXMODEL, buffer)
+ , ata_extract_version(buffer));
+ port->prio = bootprio_find_ata_device(ctrl->pci_tmp, pnr, 0);
+ }
+ return 0;
+}
+
+// Detect any drives attached to a given controller.
+static void
+ahci_port_detect(void *data)
+{
+ struct ahci_port_s *port = data;
+ int rc;
+
+ dprintf(2, "AHCI/%d: probing\n", port->pnr);
+ ahci_port_reset(port->ctrl, port->pnr);
+ rc = ahci_port_setup(port);
+ if (rc < 0)
+ ahci_port_release(port);
+ else {
+ port = ahci_port_realloc(port);
+ if (port == NULL)
+ return;
+ dprintf(1, "AHCI/%d: registering: \"%s\"\n", port->pnr, port->desc);
+ if (!port->atapi) {
+ // Register with bcv system.
+ boot_add_hd(&port->drive, port->desc, port->prio);
+ } else {
+ // fill cdidmap
+ boot_add_cd(&port->drive, port->desc, port->prio);
+ }
+ }
+}
+
+// Initialize an ata controller and detect its drives.
+static void
+ahci_controller_setup(struct pci_device *pci)
+{
+ struct ahci_ctrl_s *ctrl = malloc_fseg(sizeof(*ctrl));
+ struct ahci_port_s *port;
+ u16 bdf = pci->bdf;
+ u32 val, pnr, max;
+
+ if (!ctrl) {
+ warn_noalloc();
+ return;
+ }
+
+ if (create_bounce_buf() < 0) {
+ warn_noalloc();
+ free(ctrl);
+ return;
+ }
+
+ ctrl->pci_tmp = pci;
+ ctrl->pci_bdf = bdf;
+ ctrl->iobase = pci_config_readl(bdf, PCI_BASE_ADDRESS_5);
+ ctrl->irq = pci_config_readb(bdf, PCI_INTERRUPT_LINE);
+ dprintf(1, "AHCI controller at %02x.%x, iobase %x, irq %d\n",
+ bdf >> 3, bdf & 7, ctrl->iobase, ctrl->irq);
+
+ pci_config_maskw(bdf, PCI_COMMAND, 0,
+ PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
+
+ val = ahci_ctrl_readl(ctrl, HOST_CTL);
+ ahci_ctrl_writel(ctrl, HOST_CTL, val | HOST_CTL_AHCI_EN);
+
+ ctrl->caps = ahci_ctrl_readl(ctrl, HOST_CAP);
+ ctrl->ports = ahci_ctrl_readl(ctrl, HOST_PORTS_IMPL);
+ dprintf(2, "AHCI: cap 0x%x, ports_impl 0x%x\n",
+ ctrl->caps, ctrl->ports);
+
+ max = 0x1f;
+ for (pnr = 0; pnr <= max; pnr++) {
+ if (!(ctrl->ports & (1 << pnr)))
+ continue;
+ port = ahci_port_alloc(ctrl, pnr);
+ if (port == NULL)
+ continue;
+ run_thread(ahci_port_detect, port);
+ }
+}
+
+// Locate and init ahci controllers.
+static void
+ahci_scan(void)
+{
+ // Scan PCI bus for ATA adapters
+ struct pci_device *pci;
+ foreachpci(pci) {
+ if (pci->class != PCI_CLASS_STORAGE_SATA)
+ continue;
+ if (pci->prog_if != 1 /* AHCI rev 1 */)
+ continue;
+ ahci_controller_setup(pci);
+ }
+}
+
+void
+ahci_setup(void)
+{
+ ASSERT32FLAT();
+ if (!CONFIG_AHCI)
+ return;
+
+ dprintf(3, "init ahci\n");
+ ahci_scan();
+}
Code Review / kvmfornfv.git / blobdiff