diff options
| -rw-r--r-- | src/soc/nvidia/tegra132/lp0/tegra_lp0_resume.c | 38 |
1 files changed, 36 insertions, 2 deletions
diff --git a/src/soc/nvidia/tegra132/lp0/tegra_lp0_resume.c b/src/soc/nvidia/tegra132/lp0/tegra_lp0_resume.c index 87c3ccbf6e..a52e918ee0 100644 --- a/src/soc/nvidia/tegra132/lp0/tegra_lp0_resume.c +++ b/src/soc/nvidia/tegra132/lp0/tegra_lp0_resume.c @@ -311,6 +311,27 @@ static uint32_t *uart_clk_source_regs[4] = { (uint32_t *)0x600061c0, }; +static uint32_t *uart_base_regs[4] = { + (uint32_t *)0x70006000, + (uint32_t *)0x70006040, + (uint32_t *)0x70006200, + (uint32_t *)0x70006300, +}; +enum { + UART_THR_DLAB = 0x0, + UART_IER_DLAB = 0x1, + UART_IIR_FCR = 0x2, + UART_LCR = 0x3 +}; +enum { + UART_RATE_115200 = (408000000/115200/16), /* based on 408000000 PLLP */ + FCR_TX_CLR = 0x4, /* bit 2 of FCR : clear TX FIFO */ + FCR_RX_CLR = 0x2, /* bit 1 of FCR : clear RX FIFO */ + FCR_EN_FIFO = 0x1, /* bit 0 of FCR : enable TX & RX FIFO */ + LCR_DLAB = 0x80, /* bit 7 of LCR : Divisor Latch Access Bit */ + LCR_WD_SIZE_8 = 0x3, /* bit 1:0 of LCR : word length of 8 */ +}; + static void enable_uart(void) { uint32_t *uart_clk_enb_reg; @@ -318,6 +339,7 @@ static void enable_uart(void) uint32_t *uart_clk_source; uint32_t uart_port; uint32_t uart_mask; + uint32_t *uart_base; /* * Read odmdata (stored in pmc->odmdata) to determine debug uart port. @@ -330,14 +352,15 @@ static void enable_uart(void) */ uart_port = (read32(pmc_odmdata_ptr) >> 15) & 0x7; - /* Default to UARTA, since pmc_odmdata is not programmed yet. */ - /* TODO: if (uart_port >= 4) */ + /* Default to UARTA if uart_port is out of range */ + if (uart_port >= 4) uart_port = 0; uart_clk_enb_reg = uart_clk_out_enb_regs[uart_port]; uart_rst_reg = uart_rst_devices_regs[uart_port]; uart_mask = uart_enable_mask[uart_port]; uart_clk_source = uart_clk_source_regs[uart_port]; + uart_base = uart_base_regs[uart_port]; /* Enable UART clock */ setbits32(uart_mask, uart_clk_enb_reg); @@ -348,6 +371,17 @@ static void enable_uart(void) /* Program UART clock source: PLLP (408000000) */ write32(0, uart_clk_source); + + /* Program 115200n8 to the uart port */ + /* baud-rate of 115200 */ + write32(LCR_DLAB, (uart_base + UART_LCR)); + write32((UART_RATE_115200 & 0xff), (uart_base + UART_THR_DLAB)); + write32((UART_RATE_115200 >> 8), (uart_base + UART_IER_DLAB)); + /* 8-bit and no parity */ + write32(LCR_WD_SIZE_8, (uart_base + UART_LCR)); + /* enable and clear RX/TX FIFO */ + write32((FCR_TX_CLR + FCR_RX_CLR + FCR_EN_FIFO), + (uart_base + UART_IIR_FCR)); } /* Accessors. */ |