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x86: Support configurable UART baud rate

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This patch extends the Intel Quark X1000 SoC UART initialization API to
accept a numeric baud rate specification.
This commit is contained in:
Michael LeMay 2016-08-03 07:58:51 -07:00
parent dbb82f2439
commit 31ad67abd7
3 changed files with 13 additions and 8 deletions
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13
cpu/x86/drivers/quarkX1000/uart.c
View file

@ -35,10 +35,10 @@
PROT_DOMAINS_ALLOC(uart_16x50_driver_t, quarkX1000_uart0);
PROT_DOMAINS_ALLOC(uart_16x50_driver_t, quarkX1000_uart1);
/* Divisor setting for 115200 baud from section 18.2.2 of Intel Quark SoC
* X1000 Datasheet.
/* UART base frequency from section 18.2.2 of Intel Quark SoC X1000
* Datasheet.
*/
#define QUARK_X1000_UART_DL_115200 24
#define QUARK_X1000_UART_FBASE 44236800
/*---------------------------------------------------------------------------*/
/**
@ -46,8 +46,9 @@ PROT_DOMAINS_ALLOC(uart_16x50_driver_t, quarkX1000_uart1);
* \param dev Device to initialize.
*/
void
quarkX1000_uart_init(quarkX1000_uart_dev_t dev)
quarkX1000_uart_init(quarkX1000_uart_dev_t dev, unsigned baud)
{
uint16_t dl;
pci_config_addr_t pci_addr;
uart_16x50_driver_t ATTR_KERN_ADDR_SPACE *drv;
@ -67,7 +68,9 @@ quarkX1000_uart_init(quarkX1000_uart_dev_t dev)
drv = &quarkX1000_uart1;
PROT_DOMAINS_INIT_ID(quarkX1000_uart1);
}
uart_16x50_init(drv, pci_addr, QUARK_X1000_UART_DL_115200);
/* Divisor setting from section 18.2.2 of Intel Quark SoC X1000 Datasheet. */
dl = QUARK_X1000_UART_FBASE / (16 * baud);
uart_16x50_init(drv, pci_addr, dl);
}
/*---------------------------------------------------------------------------*/
/**

2
cpu/x86/drivers/quarkX1000/uart.h
View file

@ -38,7 +38,7 @@ typedef enum {
QUARK_X1000_UART_1
} quarkX1000_uart_dev_t;
void quarkX1000_uart_init(quarkX1000_uart_dev_t dev);
void quarkX1000_uart_init(quarkX1000_uart_dev_t dev, unsigned baud);
void quarkX1000_uart_tx(quarkX1000_uart_dev_t dev, uint8_t c);
#endif /* CPU_X86_DRIVERS_QUARKX1000_UART_H_ */

6
platform/galileo/contiki-main.c
View file

@ -86,8 +86,10 @@ main(void)
quarkX1000_imr_conf();
#endif
irq_init();
/* Initialize UART connected to Galileo Gen2 FTDI header */
quarkX1000_uart_init(QUARK_X1000_UART_1);
/* Initialize UART connected to Galileo Gen1 3.5mm audio-style jack or
* Galileo Gen2 FTDI header
*/
quarkX1000_uart_init(QUARK_X1000_UART_1, 115200);
clock_init();
rtimer_init();