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;; ;;
;; Copyright (C) KolibriOS team 2004-2021. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
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$Revision$
PCI_REG_STATUS_COMMAND = 0x0004
PCI_REG_BAR5 = 0x0024
; bit_ prefix means that its index of bit
; format: bit_AHCI_STR_REG_BIT
bit_AHCI_HBA_CAP2_BOH = 0 ; Supports BIOS/OS Handoff
bit_AHCI_HBA_BOHC_BOS = 0 ; BIOS-Owned Semaphore (BIOS owns controller)
bit_AHCI_HBA_BOHC_OOS = 1 ; OS-Owned Semaphore (OS owns controller)
bit_AHCI_HBA_BOHC_BB = 4 ; BIOS Busy (polling bit while BIOS cleans up
bit_AHCI_HBA_GHC_AHCI_ENABLE = 31 ; Enable AHCI mode
bit_AHCI_HBA_GHC_RESET = 0 ; Reset HBA
bit_AHCI_HBA_GHC_INTERRUPT_ENABLE = 1 ; Enable interrupts from the HBA
AHCI_HBA_PxSSTS_DET = 0xF
AHCI_HBA_PORT_IPM_ACTIVE = 1
AHCI_HBA_PxSSTS_DET_PRESENT = 3
AHCI_MAX_PORTS = 32 ;
HBA_MEMORY_SIZE = 0x1100
struct AHCI_DATA
abar dd ? ; pointer to HBA Memory (BAR5) mapped to virtual kernelspace memory
pcidev dd ? ; pointer to corresponding PCIDEV structure
ends
; Generic Host Control registers
struct HBA_MEM
capability dd ? ; 0x00
global_host_control dd ? ; 0x04
interrupt_status dd ? ; 0x08
port_implemented dd ? ; 0x0C
version dd ? ; 0x10
ccc_ctl dd ? ; 0x14, Command completion coalescing control
ccc_pts dd ? ; 0x18, Command completion coalescing ports
em_loc dd ? ; 0x1C, Enclosure management location
em_ctl dd ? ; 0x20, Enclosure management control
capability2 dd ? ; 0x24, Host capabilities extended
bohc dd ? ; 0x28, BIOS/OS handoff control and status
reserved rb (0xA0-0x2C) ; 0x2C - 0x9F, Reserved
vendor rb (0x100-0xA0) ; 0xA0 - 0xFF, Vendor specific
ports rb (sizeof.HBA_PORT*AHCI_MAX_PORTS) ; 0x100 - 0x10FF, Port control registers, max AHCI_MAX_PORTS
ends
; Port Control registers
struct HBA_PORT
command_list_base_l dd ? ; 0x00, command list base address, 1K-byte aligned
command_list_base_h dd ? ; 0x04, command list base address upper 32 bits, used on 64 bit systems
fis_base_l dd ? ; 0x08, FIS base address, 256-byte aligned
fis_base_h dd ? ; 0x0C, FIS base address upper 32 bits, used on 64 bit systems
interrupt_status dd ? ; 0x10
interrupt_enable dd ? ; 0x14
command dd ? ; 0x18, command and status
reserved0 dd ? ; 0x1C
task_file_data dd ? ; 0x20
signature dd ? ; 0x24
sata_status dd ? ; 0x28, SATA status (SCR0:SStatus)
sata_control dd ? ; 0x2C, SATA control (SCR2:SControl)
sata_error dd ? ; 0x30, SATA error (SCR1:SError)
sata_active dd ? ; 0x34, SATA active (SCR3:SActive)
command_issue dd ? ; 0x38
sata_notification dd ? ; 0x3C, SATA notification (SCR4:SNotification)
fis_based_switch_control dd ? ; 0x40
reserved1 rd 11 ; 0x44 - 0x6F
vendor rd 4 ; 0x70 - 0x7F, vendor specific
ends
uglobal
align 4
ahci_controller AHCI_DATA
endg
; detect ahci controller and initialize
align 4
init_ahci:
mov ecx, ahci_controller
mov esi, pcidev_list
.find_ahci_ctr:
mov esi, [esi + PCIDEV.fd]
cmp esi, pcidev_list
jz .ahci_ctr_not_found
mov eax, [esi + PCIDEV.class]
;DEBUGF 1, "K: device class = %x\n", eax
shr eax, 8 ; shift right because lowest 8 bits if ProgIf field
cmp eax, 0x0106 ; 0x01 - Mass Storage Controller class, 0x06 - Serial ATA Controller subclass
jz .ahci_ctr_found
jmp .find_ahci_ctr
.ahci_ctr_not_found:
DEBUGF 1, "K: AHCI controller not found\n"
ret
.ahci_ctr_found:
mov [ahci_controller + AHCI_DATA.pcidev], esi
mov eax, [esi+PCIDEV.class]
movzx ebx, byte [esi+PCIDEV.bus]
movzx ecx, byte [esi+PCIDEV.devfn]
shr ecx, 3 ; get rid of 3 lowest bits (function code), the rest bits is device code
movzx edx, byte [esi+PCIDEV.devfn]
and edx, 00000111b ; get only 3 lowest bits (function code)
DEBUGF 1, "K: found AHCI controller, (class, subcl, progif) = %x, bus = %x, device = %x, function = %x\n", eax, ebx, ecx, edx
; get BAR5 value, it is physical address
movzx ebx, [esi + PCIDEV.bus]
movzx ebp, [esi + PCIDEV.devfn]
stdcall pci_read32, ebx, ebp, PCI_REG_BAR5
DEBUGF 1, "K: AHCI controller MMIO = %x\n", eax
mov edi, eax
; get the size of MMIO region
stdcall pci_write32, ebx, ebp, PCI_REG_BAR5, 0xFFFFFFFF
stdcall pci_read32, ebx, ebp, PCI_REG_BAR5
not eax
inc eax
DEBUGF 1, "K: AHCI: MMIO region size = 0x%x bytes\n", eax
; Map MMIO region to virtual memory
stdcall map_io_mem, edi, eax, PG_SWR + PG_NOCACHE
mov [ahci_controller + AHCI_DATA.abar], eax
DEBUGF 1, "K: AHCI controller BAR5 mapped to virtual addr %x\n", eax
; Restore the original BAR5 value
stdcall pci_write32, ebx, ebp, PCI_REG_BAR5, edi
; Enable dma bus mastering, memory space access, clear the "disable interrupts" bit
; Usually, it is already done before us
movzx ebx, [esi + PCIDEV.bus]
movzx ebp, [esi + PCIDEV.devfn]
stdcall pci_read32, ebx, ebp, PCI_REG_STATUS_COMMAND
DEBUGF 1, "K: AHCI: pci_status_command = %x\nEnabling interrupts, DMA bus mastering and memory space access\n", eax
or eax, 0x06 ; pci.command |= 0x06 (dma bus mastering + memory space access)
btr eax, 10 ; clear the "disable interrupts" bit
DEBUGF 1, "K: AHCI: pci_status_command = %x\n", eax
stdcall pci_write32, ebx, ebp, PCI_REG_STATUS_COMMAND, eax
; ; Print some register values to debug board
; mov esi, [ahci_controller + AHCI_DATA.abar]
; DEBUGF 1, "K: AHCI: HBA.cap = %x, HBA.ghc = %x, HBA_MEM.version = %x\n", [esi + HBA_MEM.capability], [esi + HBA_MEM.global_host_control], [esi + HBA_MEM.version]
;-------------------------------------------------------
; Request BIOS/OS ownership handoff, if supported. (TODO check correctness)
mov esi, [ahci_controller + AHCI_DATA.abar]
;mov ebx, [esi + HBA_MEM.capability2]
;DEBUGF 1, "K: AHCI: HBA_MEM.cap2 = %x\n", ebx
bt [esi + HBA_MEM.capability2], bit_AHCI_HBA_CAP2_BOH
jnc .end_handoff
DEBUGF 1, "K: AHCI: requesting AHCI ownership change...\n"
bts [esi + HBA_MEM.bohc], bit_AHCI_HBA_BOHC_OOS
.wait_not_bos:
bt [esi + HBA_MEM.bohc], bit_AHCI_HBA_BOHC_BOS
jc .wait_not_bos
mov ebx, 3
call delay_hs
; if Bios Busy is still set after 30 mS, wait 2 seconds.
bt [esi + HBA_MEM.bohc], bit_AHCI_HBA_BOHC_BB
jnc @f
mov ebx, 200
call delay_hs
@@:
DEBUGF 1, "K: AHCI: ownership change completed.\n"
.end_handoff:
;-------------------------------------------------------
; enable the AHCI and reset it
bts [esi + HBA_MEM.global_host_control], bit_AHCI_HBA_GHC_AHCI_ENABLE
bts [esi + HBA_MEM.global_host_control], bit_AHCI_HBA_GHC_RESET
; wait for reset to complete
.wait_reset:
bt [esi + HBA_MEM.global_host_control], bit_AHCI_HBA_GHC_RESET
jc .wait_reset
; enable the AHCI and interrupts
bts [esi + HBA_MEM.global_host_control], bit_AHCI_HBA_GHC_AHCI_ENABLE
bts [esi + HBA_MEM.global_host_control], bit_AHCI_HBA_GHC_INTERRUPT_ENABLE
mov ebx, 2
call delay_hs
DEBUGF 1, "K: AHCI: caps: %x %x, ver: %x, ghc: %x, pi: %x\n", [esi + HBA_MEM.capability], [esi + HBA_MEM.capability2], [esi + HBA_MEM.version], [esi + HBA_MEM.global_host_control], [esi + HBA_MEM.port_implemented]
; TODO:
; calculate irq line
; ahciHBA->ghc |= AHCI_GHC_IE;
; IDT::RegisterInterruptHandler(irq, InterruptHandler);
; ahciHBA->is = 0xffffffff;
xor ebx, ebx
.detect_drives:
cmp ebx, AHCI_MAX_PORTS
jae .end_detect_drives
; if port with index ebx is not implemented then go to next
mov ecx, [esi + HBA_MEM.port_implemented]
bt ecx, ebx
jnc .continue_detect_drives
mov edi, ebx
shl edi, BSF sizeof.HBA_PORT
add edi, HBA_MEM.ports
add edi, esi
; now edi - base of HBA_MEM.ports[ebx]
DEBUGF 1, "K: AHCI: port %d, ssts = %x\n", ebx, [edi + HBA_PORT.sata_status]
mov ecx, [edi + HBA_PORT.sata_status]
shr ecx, 8
and ecx, 0x0F
cmp ecx, AHCI_HBA_PORT_IPM_ACTIVE
jne .continue_detect_drives
mov ecx, [edi + HBA_PORT.sata_status]
and ecx, AHCI_HBA_PxSSTS_DET
cmp ecx, AHCI_HBA_PxSSTS_DET_PRESENT
jne .continue_detect_drives
DEBUGF 1, "K: AHCI: found drive at port %d, signature = %x\n", ebx, [edi + HBA_PORT.signature]
.continue_detect_drives:
inc ebx
jmp .detect_drives
; TODO: why signatures of found disks are 0xFFFFFFFF ?
.end_detect_drives:
ret