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bdk: whitespace refactor

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This commit is contained in:
CTCaer
2022-07-11 22:10:11 +03:00
parent 1499f958dd
commit 70523e404f
26 changed files with 898 additions and 835 deletions
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8
bdk/soc/bpmp.c
View File

@@ -150,8 +150,8 @@ void bpmp_mmu_set_entry(int idx, bpmp_mmu_entry_t *entry, bool apply)
if (entry->enable)
{
mmu_entry->start_addr = ALIGN(entry->start_addr, BPMP_MMU_CACHE_LINE_SIZE);
mmu_entry->end_addr = ALIGN_DOWN(entry->end_addr, BPMP_MMU_CACHE_LINE_SIZE);
mmu_entry->attr = entry->attr;
mmu_entry->end_addr = ALIGN_DOWN(entry->end_addr, BPMP_MMU_CACHE_LINE_SIZE);
mmu_entry->attr = entry->attr;
BPMP_CACHE_CTRL(BPMP_CACHE_MMU_SHADOW_COPY_MASK) |= BIT(idx);
@@ -166,9 +166,9 @@ void bpmp_mmu_enable()
return;
// Init BPMP MMU.
BPMP_CACHE_CTRL(BPMP_CACHE_MMU_CMD) = MMU_CMD_INIT;
BPMP_CACHE_CTRL(BPMP_CACHE_MMU_CMD) = MMU_CMD_INIT;
BPMP_CACHE_CTRL(BPMP_CACHE_MMU_FALLBACK_ENTRY) = MMU_EN_READ | MMU_EN_WRITE | MMU_EN_EXEC; // RWX for non-defined regions.
BPMP_CACHE_CTRL(BPMP_CACHE_MMU_CFG) = MMU_CFG_SEQ_EN | MMU_CFG_TLB_EN | MMU_CFG_ABORT_STORE_LAST;
BPMP_CACHE_CTRL(BPMP_CACHE_MMU_CFG) = MMU_CFG_SEQ_EN | MMU_CFG_TLB_EN | MMU_CFG_ABORT_STORE_LAST;
// Init BPMP MMU entries.
BPMP_CACHE_CTRL(BPMP_CACHE_MMU_SHADOW_COPY_MASK) = 0;

6
bdk/soc/ccplex.c
View File

@@ -62,12 +62,12 @@ void ccplex_boot_cpu0(u32 entry)
// Configure MSELECT source and enable clock to 102MHz.
CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_MSELECT) = (CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_MSELECT) & 0x1FFFFF00) | 6;
CLOCK(CLK_RST_CONTROLLER_CLK_ENB_V_SET) = BIT(CLK_V_MSELECT);
CLOCK(CLK_RST_CONTROLLER_CLK_ENB_V_SET) = BIT(CLK_V_MSELECT);
// Configure initial CPU clock frequency and enable clock.
CLOCK(CLK_RST_CONTROLLER_CCLK_BURST_POLICY) = 0x20008888; // PLLX_OUT0_LJ.
CLOCK(CLK_RST_CONTROLLER_SUPER_CCLK_DIVIDER) = 0x80000000;
CLOCK(CLK_RST_CONTROLLER_CLK_ENB_V_SET) = BIT(CLK_V_CPUG);
CLOCK(CLK_RST_CONTROLLER_CLK_ENB_V_SET) = BIT(CLK_V_CPUG);
clock_enable_coresight();
@@ -100,7 +100,7 @@ void ccplex_boot_cpu0(u32 entry)
// MC(MC_TZ_SECURITY_CTRL) = 1;
// Clear MSELECT reset.
CLOCK(CLK_RST_CONTROLLER_RST_DEV_V_CLR) = BIT(CLK_V_MSELECT);
CLOCK(CLK_RST_CONTROLLER_RST_DEV_V_CLR) = BIT(CLK_V_MSELECT);
// Clear NONCPU reset.
CLOCK(CLK_RST_CONTROLLER_RST_CPUG_CMPLX_CLR) = 0x20000000;
// Clear CPU0 reset.

32
bdk/soc/clock.c
View File

@@ -60,55 +60,55 @@ static const clock_t _clock_i2c[] = {
};
static clock_t _clock_se = {
CLK_RST_CONTROLLER_RST_DEVICES_V, CLK_RST_CONTROLLER_CLK_OUT_ENB_V, CLK_RST_CONTROLLER_CLK_SOURCE_SE, CLK_V_SE, 0, 0 // 408MHz.
CLK_RST_CONTROLLER_RST_DEVICES_V, CLK_RST_CONTROLLER_CLK_OUT_ENB_V, CLK_RST_CONTROLLER_CLK_SOURCE_SE, CLK_V_SE, 0, 0 // 408MHz.
};
static clock_t _clock_tzram = {
CLK_RST_CONTROLLER_RST_DEVICES_V, CLK_RST_CONTROLLER_CLK_OUT_ENB_V, CLK_NO_SOURCE, CLK_V_TZRAM, 0, 0
CLK_RST_CONTROLLER_RST_DEVICES_V, CLK_RST_CONTROLLER_CLK_OUT_ENB_V, CLK_NO_SOURCE, CLK_V_TZRAM, 0, 0
};
static clock_t _clock_host1x = {
CLK_RST_CONTROLLER_RST_DEVICES_L, CLK_RST_CONTROLLER_CLK_OUT_ENB_L, CLK_RST_CONTROLLER_CLK_SOURCE_HOST1X, CLK_L_HOST1X, 4, 3 // 163.2MHz.
CLK_RST_CONTROLLER_RST_DEVICES_L, CLK_RST_CONTROLLER_CLK_OUT_ENB_L, CLK_RST_CONTROLLER_CLK_SOURCE_HOST1X, CLK_L_HOST1X, 4, 3 // 163.2MHz.
};
static clock_t _clock_tsec = {
CLK_RST_CONTROLLER_RST_DEVICES_U, CLK_RST_CONTROLLER_CLK_OUT_ENB_U, CLK_RST_CONTROLLER_CLK_SOURCE_TSEC, CLK_U_TSEC, 0, 2 // 204MHz.
CLK_RST_CONTROLLER_RST_DEVICES_U, CLK_RST_CONTROLLER_CLK_OUT_ENB_U, CLK_RST_CONTROLLER_CLK_SOURCE_TSEC, CLK_U_TSEC, 0, 2 // 204MHz.
};
static clock_t _clock_nvdec = {
CLK_RST_CONTROLLER_RST_DEVICES_Y, CLK_RST_CONTROLLER_CLK_OUT_ENB_Y, 0x698, CLK_Y_NVDEC, 4, 0 // 408 MHz.
CLK_RST_CONTROLLER_RST_DEVICES_Y, CLK_RST_CONTROLLER_CLK_OUT_ENB_Y, CLK_RST_CONTROLLER_CLK_SOURCE_NVDEC, CLK_Y_NVDEC, 4, 0 // 408 MHz.
};
static clock_t _clock_nvjpg = {
CLK_RST_CONTROLLER_RST_DEVICES_Y, CLK_RST_CONTROLLER_CLK_OUT_ENB_Y, 0x69C, CLK_Y_NVJPG, 4, 0 // 408 MHz.
CLK_RST_CONTROLLER_RST_DEVICES_Y, CLK_RST_CONTROLLER_CLK_OUT_ENB_Y, CLK_RST_CONTROLLER_CLK_SOURCE_NVJPG, CLK_Y_NVJPG, 4, 0 // 408 MHz.
};
static clock_t _clock_sor_safe = {
CLK_RST_CONTROLLER_RST_DEVICES_Y, CLK_RST_CONTROLLER_CLK_OUT_ENB_Y, CLK_NO_SOURCE, CLK_Y_SOR_SAFE, 0, 0
CLK_RST_CONTROLLER_RST_DEVICES_Y, CLK_RST_CONTROLLER_CLK_OUT_ENB_Y, CLK_NO_SOURCE, CLK_Y_SOR_SAFE, 0, 0
};
static clock_t _clock_sor0 = {
CLK_RST_CONTROLLER_RST_DEVICES_X, CLK_RST_CONTROLLER_CLK_OUT_ENB_X, CLK_NOT_USED, CLK_X_SOR0, 0, 0
CLK_RST_CONTROLLER_RST_DEVICES_X, CLK_RST_CONTROLLER_CLK_OUT_ENB_X, CLK_NOT_USED, CLK_X_SOR0, 0, 0
};
static clock_t _clock_sor1 = {
CLK_RST_CONTROLLER_RST_DEVICES_X, CLK_RST_CONTROLLER_CLK_OUT_ENB_X, CLK_RST_CONTROLLER_CLK_SOURCE_SOR1, CLK_X_SOR1, 0, 2 // 204MHz.
CLK_RST_CONTROLLER_RST_DEVICES_X, CLK_RST_CONTROLLER_CLK_OUT_ENB_X, CLK_RST_CONTROLLER_CLK_SOURCE_SOR1, CLK_X_SOR1, 0, 2 // 204MHz.
};
static clock_t _clock_kfuse = {
CLK_RST_CONTROLLER_RST_DEVICES_H, CLK_RST_CONTROLLER_CLK_OUT_ENB_H, CLK_NO_SOURCE, CLK_H_KFUSE, 0, 0
CLK_RST_CONTROLLER_RST_DEVICES_H, CLK_RST_CONTROLLER_CLK_OUT_ENB_H, CLK_NO_SOURCE, CLK_H_KFUSE, 0, 0
};
static clock_t _clock_cl_dvfs = {
CLK_RST_CONTROLLER_RST_DEVICES_W, CLK_RST_CONTROLLER_CLK_OUT_ENB_W, CLK_NO_SOURCE, CLK_W_DVFS, 0, 0
CLK_RST_CONTROLLER_RST_DEVICES_W, CLK_RST_CONTROLLER_CLK_OUT_ENB_W, CLK_NO_SOURCE, CLK_W_DVFS, 0, 0
};
static clock_t _clock_coresight = {
CLK_RST_CONTROLLER_RST_DEVICES_U, CLK_RST_CONTROLLER_CLK_OUT_ENB_U, CLK_RST_CONTROLLER_CLK_SOURCE_CSITE, CLK_U_CSITE, 0, 4 // 136MHz.
CLK_RST_CONTROLLER_RST_DEVICES_U, CLK_RST_CONTROLLER_CLK_OUT_ENB_U, CLK_RST_CONTROLLER_CLK_SOURCE_CSITE, CLK_U_CSITE, 0, 4 // 136MHz.
};
static clock_t _clock_pwm = {
CLK_RST_CONTROLLER_RST_DEVICES_L, CLK_RST_CONTROLLER_CLK_OUT_ENB_L, CLK_RST_CONTROLLER_CLK_SOURCE_PWM, CLK_L_PWM, 6, 4 // Fref: 6.4MHz. HOS: PLLP / 54 = 7.55MHz.
CLK_RST_CONTROLLER_RST_DEVICES_L, CLK_RST_CONTROLLER_CLK_OUT_ENB_L, CLK_RST_CONTROLLER_CLK_SOURCE_PWM, CLK_L_PWM, 6, 4 // Fref: 6.4MHz. HOS: PLLP / 54 = 7.55MHz.
};
static clock_t _clock_sdmmc_legacy_tm = {
CLK_RST_CONTROLLER_RST_DEVICES_Y, CLK_RST_CONTROLLER_CLK_OUT_ENB_Y, CLK_RST_CONTROLLER_CLK_SOURCE_SDMMC_LEGACY_TM, CLK_Y_SDMMC_LEGACY_TM, 4, 66
};
static clock_t _clock_apbdma = {
CLK_RST_CONTROLLER_RST_DEVICES_H, CLK_RST_CONTROLLER_CLK_OUT_ENB_H, CLK_NO_SOURCE, CLK_H_APBDMA, 0, 0
CLK_RST_CONTROLLER_RST_DEVICES_H, CLK_RST_CONTROLLER_CLK_OUT_ENB_H, CLK_NO_SOURCE, CLK_H_APBDMA, 0, 0
};
static clock_t _clock_ahbdma = {
CLK_RST_CONTROLLER_RST_DEVICES_H, CLK_RST_CONTROLLER_CLK_OUT_ENB_H, CLK_NO_SOURCE, CLK_H_AHBDMA, 0, 0
CLK_RST_CONTROLLER_RST_DEVICES_H, CLK_RST_CONTROLLER_CLK_OUT_ENB_H, CLK_NO_SOURCE, CLK_H_AHBDMA, 0, 0
};
static clock_t _clock_actmon = {
CLK_RST_CONTROLLER_RST_DEVICES_V, CLK_RST_CONTROLLER_CLK_OUT_ENB_V, CLK_RST_CONTROLLER_CLK_SOURCE_ACTMON, CLK_V_ACTMON, 6, 0 // 19.2MHz.
CLK_RST_CONTROLLER_RST_DEVICES_V, CLK_RST_CONTROLLER_CLK_OUT_ENB_V, CLK_RST_CONTROLLER_CLK_SOURCE_ACTMON, CLK_V_ACTMON, 6, 0 // 19.2MHz.
};
static clock_t _clock_extperiph1 = {
CLK_RST_CONTROLLER_RST_DEVICES_V, CLK_RST_CONTROLLER_CLK_OUT_ENB_V, CLK_RST_CONTROLLER_CLK_SOURCE_EXTPERIPH1, CLK_V_EXTPERIPH1, 0, 0

2
bdk/soc/clock.h
View File

@@ -157,6 +157,8 @@
#define CLK_RST_CONTROLLER_CLK_SOURCE_EMC_DLL 0x664
#define CLK_RST_CONTROLLER_CLK_SOURCE_UART_FST_MIPI_CAL 0x66C
#define CLK_RST_CONTROLLER_CLK_SOURCE_SDMMC_LEGACY_TM 0x694
#define CLK_RST_CONTROLLER_CLK_SOURCE_NVDEC 0x698
#define CLK_RST_CONTROLLER_CLK_SOURCE_NVJPG 0x69C
#define CLK_RST_CONTROLLER_CLK_SOURCE_NVENC 0x6A0
#define CLK_RST_CONTROLLER_CLK_SOURCE_APE 0x6C0
#define CLK_RST_CONTROLLER_CLK_SOURCE_USB2_HSIC_TRK 0x6CC

28
bdk/soc/hw_init.c
View File

@@ -72,24 +72,24 @@ u32 hw_get_chip_id()
static void _config_oscillators()
{
CLOCK(CLK_RST_CONTROLLER_SPARE_REG0) = (CLOCK(CLK_RST_CONTROLLER_SPARE_REG0) & 0xFFFFFFF3) | 4; // Set CLK_M_DIVISOR to 2.
SYSCTR0(SYSCTR0_CNTFID0) = 19200000; // Set counter frequency.
TMR(TIMERUS_USEC_CFG) = 0x45F; // For 19.2MHz clk_m.
CLOCK(CLK_RST_CONTROLLER_OSC_CTRL) = 0x50000071; // Set OSC to 38.4MHz and drive strength.
SYSCTR0(SYSCTR0_CNTFID0) = 19200000; // Set counter frequency.
TMR(TIMERUS_USEC_CFG) = 0x45F; // For 19.2MHz clk_m.
CLOCK(CLK_RST_CONTROLLER_OSC_CTRL) = 0x50000071; // Set OSC to 38.4MHz and drive strength.
PMC(APBDEV_PMC_OSC_EDPD_OVER) = (PMC(APBDEV_PMC_OSC_EDPD_OVER) & 0xFFFFFF81) | 0xE; // Set LP0 OSC drive strength.
PMC(APBDEV_PMC_OSC_EDPD_OVER) = (PMC(APBDEV_PMC_OSC_EDPD_OVER) & 0xFFBFFFFF) | PMC_OSC_EDPD_OVER_OSC_CTRL_OVER;
PMC(APBDEV_PMC_CNTRL2) = (PMC(APBDEV_PMC_CNTRL2) & 0xFFFFEFFF) | PMC_CNTRL2_HOLD_CKE_LOW_EN;
PMC(APB_MISC_GP_ASDBGREG) = (PMC(APB_MISC_GP_ASDBGREG) & 0xFCFFFFFF) | (2 << 24); // CFG2TMC_RAM_SVOP_PDP.
PMC(APBDEV_PMC_CNTRL2) = (PMC(APBDEV_PMC_CNTRL2) & 0xFFFFEFFF) | PMC_CNTRL2_HOLD_CKE_LOW_EN;
PMC(APB_MISC_GP_ASDBGREG) = (PMC(APB_MISC_GP_ASDBGREG) & 0xFCFFFFFF) | (2 << 24); // CFG2TMC_RAM_SVOP_PDP.
CLOCK(CLK_RST_CONTROLLER_CLK_SYSTEM_RATE) = 0x10; // Set HCLK div to 2 and PCLK div to 1.
CLOCK(CLK_RST_CONTROLLER_PLLMB_BASE) &= 0xBFFFFFFF; // PLLMB disable.
CLOCK(CLK_RST_CONTROLLER_CLK_SYSTEM_RATE) = 0x10; // Set HCLK div to 2 and PCLK div to 1.
CLOCK(CLK_RST_CONTROLLER_PLLMB_BASE) &= 0xBFFFFFFF; // PLLMB disable.
PMC(APBDEV_PMC_TSC_MULT) = (PMC(APBDEV_PMC_TSC_MULT) & 0xFFFF0000) | 0x249F; //0x249F = 19200000 * (16 / 32.768 kHz)
CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_SYS) = 0; // Set BPMP/SCLK div to 1.
CLOCK(CLK_RST_CONTROLLER_SCLK_BURST_POLICY) = 0x20004444; // Set BPMP/SCLK source to Run and PLLP_OUT2 (204MHz).
CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_SYS) = 0; // Set BPMP/SCLK div to 1.
CLOCK(CLK_RST_CONTROLLER_SCLK_BURST_POLICY) = 0x20004444; // Set BPMP/SCLK source to Run and PLLP_OUT2 (204MHz).
CLOCK(CLK_RST_CONTROLLER_SUPER_SCLK_DIVIDER) = 0x80000000; // Enable SUPER_SDIV to 1.
CLOCK(CLK_RST_CONTROLLER_CLK_SYSTEM_RATE) = 2; // Set HCLK div to 1 and PCLK div to 3.
CLOCK(CLK_RST_CONTROLLER_CLK_SYSTEM_RATE) = 2; // Set HCLK div to 1 and PCLK div to 3.
}
// The uart is skipped for Copper, Hoag and Calcio. Used in Icosa, Iowa and Aula.
@@ -242,9 +242,9 @@ static void _mbist_workaround()
// Set child clock sources.
CLOCK(CLK_RST_CONTROLLER_PLLD_BASE) &= 0x1F7FFFFF; // Disable PLLD and set reference clock and csi clock.
CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_SOR1) &= 0xFFFF3FFF; // Set SOR1 to automatic muxing of safe clock (24MHz) or SOR1 clk switch.
CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_VI) = (CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_VI) & 0x1FFFFFFF) | 0x80000000; // Set clock source to PLLP_OUT.
CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_VI) = (CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_VI) & 0x1FFFFFFF) | 0x80000000; // Set clock source to PLLP_OUT.
CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_HOST1X) = (CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_HOST1X) & 0x1FFFFFFF) | 0x80000000; // Set clock source to PLLP_OUT.
CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_NVENC) = (CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_NVENC) & 0x1FFFFFFF) | 0x80000000; // Set clock source to PLLP_OUT.
CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_NVENC) = (CLOCK(CLK_RST_CONTROLLER_CLK_SOURCE_NVENC) & 0x1FFFFFFF) | 0x80000000; // Set clock source to PLLP_OUT.
}
static void _config_se_brom()
@@ -404,9 +404,9 @@ void hw_init()
// Power on T210B01 shadow TZRAM and lock the reg.
if (!tegra_t210)
{
PMC(APBDEV_PMC_TZRAM_PWR_CNTRL) &= ~PMC_TZRAM_PWR_CNTRL_SD;
PMC(APBDEV_PMC_TZRAM_PWR_CNTRL) &= ~PMC_TZRAM_PWR_CNTRL_SD;
PMC(APBDEV_PMC_TZRAM_NON_SEC_DISABLE) = PMC_TZRAM_DISABLE_REG_WRITE | PMC_TZRAM_DISABLE_REG_READ;
PMC(APBDEV_PMC_TZRAM_SEC_DISABLE) = PMC_TZRAM_DISABLE_REG_WRITE | PMC_TZRAM_DISABLE_REG_READ;
PMC(APBDEV_PMC_TZRAM_SEC_DISABLE) = PMC_TZRAM_DISABLE_REG_WRITE | PMC_TZRAM_DISABLE_REG_READ;
}
// Initialize External memory controller and configure DRAM parameters.

20
bdk/soc/irq.c
View File

@@ -71,7 +71,7 @@ static void _irq_disable_and_ack_all()
{
u32 enabled_irqs = ICTLR(ctrl_idx, PRI_ICTLR_COP_IER);
ICTLR(ctrl_idx, PRI_ICTLR_COP_IER_CLR) = enabled_irqs;
ICTLR(ctrl_idx, PRI_ICTLR_FIR_CLR) = enabled_irqs;
ICTLR(ctrl_idx, PRI_ICTLR_FIR_CLR) = enabled_irqs;
}
}
@@ -90,10 +90,10 @@ void irq_free(u32 irq)
{
if (irqs[idx].irq == irq && irqs[idx].handler)
{
irqs[idx].irq = 0;
irqs[idx].irq = 0;
irqs[idx].handler = NULL;
irqs[idx].data = NULL;
irqs[idx].flags = 0;
irqs[idx].data = NULL;
irqs[idx].flags = 0;
_irq_disable_source(irq);
}
@@ -108,10 +108,10 @@ static void _irq_free_all()
{
_irq_disable_source(irqs[idx].irq);
irqs[idx].irq = 0;
irqs[idx].irq = 0;
irqs[idx].handler = NULL;
irqs[idx].data = NULL;
irqs[idx].flags = 0;
irqs[idx].data = NULL;
irqs[idx].flags = 0;
}
}
}
@@ -220,10 +220,10 @@ irq_status_t irq_request(u32 irq, irq_handler_t handler, void *data, irq_flags_t
DPRINTF("Registered handler, IRQ: %d, Slot: %d\n", irq, idx);
DPRINTF("Handler: %08p, Flags: %x\n", (u32)handler, flags);
irqs[idx].irq = irq;
irqs[idx].irq = irq;
irqs[idx].handler = handler;
irqs[idx].data = data;
irqs[idx].flags = flags;
irqs[idx].data = data;
irqs[idx].flags = flags;
_irq_enable_source(irq);

4
bdk/soc/pinmux.c
View File

@@ -19,8 +19,8 @@
void pinmux_config_uart(u32 idx)
{
PINMUX_AUX(PINMUX_AUX_UARTX_TX(idx)) = 0;
PINMUX_AUX(PINMUX_AUX_UARTX_RX(idx)) = PINMUX_INPUT_ENABLE | PINMUX_TRISTATE;
PINMUX_AUX(PINMUX_AUX_UARTX_TX(idx)) = 0;
PINMUX_AUX(PINMUX_AUX_UARTX_RX(idx)) = PINMUX_INPUT_ENABLE | PINMUX_TRISTATE;
PINMUX_AUX(PINMUX_AUX_UARTX_RTS(idx)) = 0;
PINMUX_AUX(PINMUX_AUX_UARTX_CTS(idx)) = PINMUX_INPUT_ENABLE | PINMUX_TRISTATE;
}

14
bdk/soc/uart.c
View File

@@ -40,21 +40,27 @@ void uart_init(u32 idx, u32 baud, u32 mode)
// Misc settings.
u32 div = clk_type ? ((8 * baud + 408000000) / (16 * baud)) : 1; // DIV_ROUND_CLOSEST.
uart->UART_IER_DLAB = 0; // Disable interrupts.
uart->UART_LCR = UART_LCR_DLAB | UART_LCR_WORD_LENGTH_8; // Enable DLAB & set 8n1 mode.
uart->UART_THR_DLAB = (u8)div; // Divisor latch LSB.
uart->UART_LCR = UART_LCR_DLAB | UART_LCR_WORD_LENGTH_8; // Enable DLAB & set 8n1 mode.
uart->UART_THR_DLAB = (u8)div; // Divisor latch LSB.
uart->UART_IER_DLAB = (u8)(div >> 8); // Divisor latch MSB.
// Disable DLAB and set STOP bits setting if applicable.
uart->UART_LCR = uart_lcr_stop | UART_LCR_WORD_LENGTH_8;
(void)uart->UART_SPR;
// Setup and flush fifo.
// Enable fifo.
uart->UART_IIR_FCR = UART_IIR_FCR_EN_FIFO;
(void)uart->UART_SPR;
usleep(20);
uart->UART_MCR = 0; // Disable hardware flow control.
// Disable hardware flow control.
uart->UART_MCR = 0;
usleep(96);
// Clear tx/rx fifos.
uart->UART_IIR_FCR = UART_IIR_FCR_EN_FIFO | UART_IIR_FCR_TX_CLR | UART_IIR_FCR_RX_CLR;
// Set hardware flow control.
uart->UART_MCR = mode;
// Wait 3 symbols for baudrate change.