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tegra132: configure debug uart to 115200n8 in tegra_lp0_resume 

Need to configure debug uart port to have proper baudrate/width/parity.
Hard-code it to 115200n8.

BUG=chrome-os-partner:32015
BRANCH=None
TEST=successfully suspend/resume on Rush/Ryu

Change-Id: I502fd8361baf2bea642fabbc4d5e126da5411ba3
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 8c70625ad41efca9117c8682113b226e929e93c5
Original-Change-Id: I6a96c80654ce52f5b877fd46995ca8c1aceb7017
Original-Signed-off-by: Yen Lin <yelin@nvidia.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/226407
Original-Reviewed-by: Tom Warren <twarren@nvidia.com>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9391
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Yen Lin 2014-10-29 17:42:47 -07:00 committed by Patrick Georgi
parent b777f3e3d1
commit db3f383494
1 changed files with 36 additions and 2 deletions
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38
src/soc/nvidia/tegra132/lp0/tegra_lp0_resume.c
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@ -311,6 +311,27 @@ static uint32_t *uart_clk_source_regs[4] = {
(uint32_t *)0x600061c0, (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) static void enable_uart(void)
{ {
uint32_t *uart_clk_enb_reg; uint32_t *uart_clk_enb_reg;
@ -318,6 +339,7 @@ static void enable_uart(void)
uint32_t *uart_clk_source; uint32_t *uart_clk_source;
uint32_t uart_port; uint32_t uart_port;
uint32_t uart_mask; uint32_t uart_mask;
uint32_t *uart_base;
/* /*
* Read odmdata (stored in pmc->odmdata) to determine debug uart port. * 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; uart_port = (read32(pmc_odmdata_ptr) >> 15) & 0x7;
/* Default to UARTA, since pmc_odmdata is not programmed yet. */ /* Default to UARTA if uart_port is out of range */
/* TODO: if (uart_port >= 4) */ if (uart_port >= 4)
uart_port = 0; uart_port = 0;
uart_clk_enb_reg = uart_clk_out_enb_regs[uart_port]; uart_clk_enb_reg = uart_clk_out_enb_regs[uart_port];
uart_rst_reg = uart_rst_devices_regs[uart_port]; uart_rst_reg = uart_rst_devices_regs[uart_port];
uart_mask = uart_enable_mask[uart_port]; uart_mask = uart_enable_mask[uart_port];
uart_clk_source = uart_clk_source_regs[uart_port]; uart_clk_source = uart_clk_source_regs[uart_port];
uart_base = uart_base_regs[uart_port];
/* Enable UART clock */ /* Enable UART clock */
setbits32(uart_mask, uart_clk_enb_reg); setbits32(uart_mask, uart_clk_enb_reg);
@ -348,6 +371,17 @@ static void enable_uart(void)
/* Program UART clock source: PLLP (408000000) */ /* Program UART clock source: PLLP (408000000) */
write32(0, uart_clk_source); 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. */ /* Accessors. */