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Use and adapt the UART driver from hekate/hwinit

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This commit is contained in:
TuxSH 2018-03-08 01:02:45 +01:00
parent a409016a88
commit ff9322a468
4 changed files with 99 additions and 49 deletions
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61
exosphere/src/uart.h
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@ -5,25 +5,56 @@
#include "memory_map.h"
/* Exosphere driver for the Tegra X1 UARTs. */
/* Mostly copied from https://github.com/nwert/hekate/blob/master/hwinit/uart.h and https://github.com/nwert/hekate/blob/master/hwinit/uart.c */
/* TODO: Should we bother with support UARTB-D? */
static inline uintptr_t get_uarta_base(void) {
return MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_UART_A);
static inline uintptr_t get_uart_base(void) {
return MMIO_GET_DEVICE_ADDRESS(MMIO_DEVID_UART);
}
#define UARTA_BASE (get_uarta_base())
#define UART_BASE (get_uart_base())
#define UART_THR_DLAB_0_0 MAKE_REG32(UARTA_BASE + 0x0)
#define UART_IER_DLAB_0_0 MAKE_REG32(UARTA_BASE + 0x4)
#define UART_IIR_FCR_0 MAKE_REG32(UARTA_BASE+ 0x8)
#define UART_LCR_0 MAKE_REG32(UARTA_BASE + 0xC)
#define UART_LSR_0 MAKE_REG32(UARTA_BASE + 0x14)
/* Exosphère: add the clkreset values for UART C,D,E */
typedef enum {
UART_A = 0,
UART_B = 1,
UART_C = 2,
UART_D = 3,
UART_E = 4,
} UartDevice;
void uart_select(unsigned int id);
void uart_initialize(uint16_t divider);
void uart_transmit_char(char ch);
void uart_transmit_str(const char *str);
void uart_transmit_hex(uint32_t value);
#define BAUD_115200 115200
#define UART_TX_IDLE 0x00000001
#define UART_RX_IDLE 0x00000002
#define UART_TX_FIFO_FULL 0x100
#define UART_RX_FIFO_EMPTY 0x200
typedef struct {
/* 0x00 */ uint32_t UART_THR_DLAB;
/* 0x04 */ uint32_t UART_IER_DLAB;
/* 0x08 */ uint32_t UART_IIR_FCR;
/* 0x0C */ uint32_t UART_LCR;
/* 0x10 */ uint32_t UART_MCR;
/* 0x14 */ uint32_t UART_LSR;
/* 0x18 */ uint32_t UART_MSR;
/* 0x1C */ uint32_t UART_SPR;
/* 0x20 */ uint32_t UART_IRDA_CSR;
/* 0x24 */ uint32_t UART_RX_FIFO_CFG;
/* 0x28 */ uint32_t UART_MIE;
/* 0x2C */ uint32_t UART_VENDOR_STATUS;
/* 0x30 */ uint8_t _pad_30[0x0C];
/* 0x3C */ uint32_t UART_ASR;
} uart_t;
void uart_select(UartDevice dev);
void uart_init(UartDevice dev, uint32_t baud);
void uart_wait_idle(UartDevice dev, uint32_t which);
void uart_send(UartDevice dev, const void *buf, size_t len);
void uart_recv(UartDevice dev, void *buf, size_t len);
static inline volatile uart_t *get_uart_device(UartDevice dev) {
static const size_t offsets[] = {0, 0x40, 0x200, 0x300, 0x400};
return (volatile uart_t *)(UART_BASE + offsets[dev]);
}
#endif