Working SPD reading in fwstart.img
This commit is contained in:
Vladimir 'phcoder' Serbinenko
parent
a1efcc79d3
commit
7517048135
8 changed files with 321 additions and 12 deletions
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@ -17,17 +17,107 @@
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*/
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#include <grub/mips/yeeloong/serial.h>
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#include <grub/mips/yeeloong/pci.h>
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#include <grub/mips/yeeloong/boot.h>
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#include <grub/pci.h>
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#include <grub/serial.h>
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#include <grub/cs5536.h>
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.set noreorder
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.set noat
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.set nomacro
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.global start,_start,__start
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start:
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_start:
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__start:
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bal serial_hw_init
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nop
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self:
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b self
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nop
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/* Find CS5536 controller. */
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/* $t4 chooses device in priority encoding. */
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/* Resulting value is kept in GRUB_MACHINE_PCI_CONF_CTRL_REG.
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This way we don't need to sacrifice a register for it. */
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/* We have only one bus (0). Function is 0. */
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lui $t0, GRUB_MACHINE_PCI_CONF_CTRL_REG_HI
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lui $t1, %hi(GRUB_MACHINE_PCI_CONFSPACE)
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lui $t3, %hi(GRUB_CS5536_PCIID)
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addiu $t3, $t3, %lo(GRUB_CS5536_PCIID)
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ori $t4, $zero, 1
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lui $a0, %hi(no_cs5536)
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1:
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andi $t4, $t4, 0xffff
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beql $t4, $zero, fatal
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addiu $a0, $a0, %lo(no_cs5536)
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sw $t4, GRUB_MACHINE_PCI_CONF_CTRL_REG_LO($t0)
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lw $t2, (%lo(GRUB_MACHINE_PCI_CONFSPACE) + GRUB_PCI_REG_PCI_ID) ($t1)
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bnel $t2, $t3, 1b
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sll $t4, $t4, 1
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bal message
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addiu $a0, $a0, %lo(cs5536_found)
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bal printhex
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move $a0, $t4
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/* Initialise SMBus controller. */
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/* Set GPIO LBAR. */
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lui $a0, %hi(GRUB_CS5536_MSR_GPIO_BAR)
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addiu $a0, $a0, %lo(GRUB_CS5536_MSR_GPIO_BAR)
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ori $a1, $zero, GRUB_CS5536_LBAR_GPIO
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/* Set mask to 0xf and enabled bit to 1. */
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bal wrmsr
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ori $a2, $zero, 0xf001
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/* Set SMBUS LBAR. */
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lui $a0, %hi(GRUB_CS5536_MSR_SMB_BAR)
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addiu $a0, $a0, %lo(GRUB_CS5536_MSR_SMB_BAR)
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ori $a1, $zero, GRUB_CS5536_LBAR_SMBUS
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/* Set mask to 0xf and enabled bit to 1. */
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bal wrmsr
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ori $a2, $zero, 0xf001
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lui $a0, %hi(smbus_enabled)
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bal message
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addiu $a0, $a0, %lo(smbus_enabled)
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/* Enable SMBus controller pins. */
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lui $t0, %hi(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_GPIO)
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ori $t1, $zero, GRUB_GPIO_SMBUS_PINS
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sw $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_GPIO + GRUB_GPIO_REG_OUT_EN) ($t0)
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sw $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_GPIO + GRUB_GPIO_REG_OUT_AUX1) ($t0)
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sw $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_GPIO + GRUB_GPIO_REG_IN_EN) ($t0)
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sw $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_GPIO + GRUB_GPIO_REG_IN_AUX1) ($t0)
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lui $t0, %hi(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS)
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/* Disable SMB. */
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sb $zero, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL2) ($t0)
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/* Disable interrupts. */
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sb $zero, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1) ($t0)
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/* Set as master. */
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sb $zero, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_ADDR) ($t0)
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/* Launch SMBus controller at slowest speed possible. */
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ori $t1, $zero, 0xff
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sb $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL3) ($t0)
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sb $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL2) ($t0)
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ori $a0, $zero, 0x50
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bal read_spd
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move $a1, $zero
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bal printhex
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move $a0, $v0
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ori $a0, $zero, 0x50
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bal read_spd
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ori $a1, $zero, 2
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bal printhex
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move $a0, $v0
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lui $a0, %hi(not_implemented)
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b fatal
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addiu $a0, $a0, %lo(not_implemented)
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/* Same as similarly named C function but in asm since
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we need it early. */
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@ -70,12 +160,164 @@ serial_hw_init:
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/* In: $a0 = asciiz message. Out: none. Clobbered: $t0, $t1, $a0. */
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message:
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lui $t0, GRUB_MACHINE_SERIAL_PORT_HI
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1:
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1:
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lb $t1, (GRUB_MACHINE_SERIAL_PORT_LO + UART_LSR)($t0)
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andi $t1, $t1, UART_EMPTY_TRANSMITTER
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beq $t1, $zero, 1b
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nop
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lb $t1, 0($a0)
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addiu $a0, $a0, 1
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sb $t1, (GRUB_MACHINE_SERIAL_PORT_LO + UART_TX)($t0)
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bne $t1, $zero, 1b
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sb $t1, (GRUB_MACHINE_SERIAL_PORT_LO + UART_TX)($t0)
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addiu $a0, $a0, 1
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jr $ra
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nop
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/* Print 32-bit hexadecimal on serial.
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In: $a0. Out: None. Clobbered: $a0, $t0, $t1, $t2
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*/
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printhex:
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lui $t0, GRUB_MACHINE_SERIAL_PORT_HI
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ori $t2, $zero, 8
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1:
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lb $t1, (GRUB_MACHINE_SERIAL_PORT_LO + UART_LSR)($t0)
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andi $t1, $t1, UART_EMPTY_TRANSMITTER
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beq $t1, $zero, 1b
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nop
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srl $t1, $a0, 28
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addiu $t1, $t1, -10
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blt $t1, $zero, 2f
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sll $a0, $a0, 4
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addiu $t1, $t1, 'A'-10-'0'
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2: addiu $t1, $t1, '0'+10
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sb $t1, (GRUB_MACHINE_SERIAL_PORT_LO + UART_TX)($t0)
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addiu $t2, $t2, -1
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bne $t2, $zero, 1b
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nop
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jr $ra
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nop
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fatal:
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bal message
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nop
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self:
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b self
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nop
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. = start + GRUB_MACHINE_FLASH_TLB_REFILL - GRUB_MACHINE_FLASH_START
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tlb_refill:
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lui $a0, %hi(unhandled_tlb_refill)
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b fatal
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addiu $a0, $a0, %lo(unhandled_tlb_refill)
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. = start + GRUB_MACHINE_FLASH_CACHE_ERROR - GRUB_MACHINE_FLASH_START
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cache_error:
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lui $a0, %hi(unhandled_cache_error)
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b fatal
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addiu $a0, $a0, %lo(unhandled_cache_error)
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. = start + GRUB_MACHINE_FLASH_OTHER_EXCEPTION - GRUB_MACHINE_FLASH_START
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other_exception:
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lui $a0, %hi(unhandled_exception)
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b fatal
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addiu $a0, $a0, %lo(unhandled_exception)
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/* Write CS5536 MSR.
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In: $a0 address, $a1 lower word, $a2 upper word.
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Out: None
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Clobbered: $t0
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*/
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wrmsr:
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lui $t0, %hi(GRUB_MACHINE_PCI_CONFSPACE)
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sw $a0, (%lo(GRUB_MACHINE_PCI_CONFSPACE) + GRUB_CS5536_MSR_MAILBOX_ADDR) ($t0)
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sw $a1, (%lo(GRUB_MACHINE_PCI_CONFSPACE) + GRUB_CS5536_MSR_MAILBOX_DATA0) ($t0)
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jr $ra
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sw $a2, (%lo(GRUB_MACHINE_PCI_CONFSPACE) + GRUB_CS5536_MSR_MAILBOX_DATA1) ($t0)
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/* Wait for SMBus data or empty transmitter. */
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/* In: $a0 = exception handler. Out: none. Clobbered: $t0, $t1 */
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smbus_wait:
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1:
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lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_STATUS + GRUB_MACHINE_PCI_IO_BASE)
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lb $t0, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_STATUS + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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andi $t1, $t0, GRUB_CS5536_SMB_REG_STATUS_SDAST
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bne $t1, $zero, return
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nop
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andi $t1, $t0, (GRUB_CS5536_SMB_REG_STATUS_BER | GRUB_CS5536_SMB_REG_STATUS_NACK)
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beq $t1, $zero, 1b
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nop
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jr $a0
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nop
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return:
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jr $ra
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nop
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/* Read SPD byte. In: $a0 device, $a1 byte. Out: $v0 read byte (0x100 on failure).
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Clobbered: $t0, $t1, $t2, $t3, $a0. */
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read_spd:
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move $t2, $a0
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move $t3, $ra
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lui $a0, %hi(read_spd_fail)
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addiu $a0, $a0, %hi(read_spd_fail)
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/* Send START. */
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lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE)
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lb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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ori $t1, $t1, GRUB_CS5536_SMB_REG_CTRL1_START
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bal smbus_wait
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sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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/* Send device address. */
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lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE)
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sll $t1, $t2, 1
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bal smbus_wait
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sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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/* Send ACK. */
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lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE)
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lb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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ori $t1, $t1, GRUB_CS5536_SMB_REG_CTRL1_ACK
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sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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/* Send byte address. */
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lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE)
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bal smbus_wait
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sb $a1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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/* Send START. */
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lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE)
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lb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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ori $t1, $t1, GRUB_CS5536_SMB_REG_CTRL1_START
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bal smbus_wait
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sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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/* Send device address. */
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lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE)
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sll $t1, $t2, 1
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ori $t1, $t1, 1
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bal smbus_wait
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sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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/* Send STOP. */
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lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE)
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lb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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ori $t1, $t1, GRUB_CS5536_SMB_REG_CTRL1_STOP
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bal smbus_wait
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sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE)
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lb $v0, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE) ($t0)
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jr $t3
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andi $v0, $v0, 0xff
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read_spd_fail:
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jr $t3
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ori $v0, $v0, 0x100
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notification_string: .asciz "GRUB "
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no_cs5536: .asciz "No CS5536 found.\n\r"
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cs5536_found: .asciz "CS5536 at "
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sm_failed: .asciz "SM transaction failed.\n\r"
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not_implemented: .asciz "Nothing more is implemented. Bye.\n\r"
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unhandled_tlb_refill: .asciz "Unhandled TLB refill.\n\r"
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unhandled_cache_error: .asciz "Unhandled cache error.\n\r"
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unhandled_exception: .asciz "Unhandled exception.\n\r"
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smbus_enabled: .asciz "SMBus controller enabled.\n\r"
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