+++ /dev/null
-/*
- * (C) Copyright 2003
- *
- * Pantelis Antoniou <panto@intracom.gr>
- * Intracom S.A.
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
-
-#include <common.h>
-#include <watchdog.h>
-#include <serial.h>
-#include <linux/compiler.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-/**************************************************************/
-
-/* convienient macros */
-#define MAX3100_SPI_RXD() (MAX3100_SPI_RXD_PORT & MAX3100_SPI_RXD_BIT)
-
-#define MAX3100_SPI_TXD(x) \
- do { \
- if (x) \
- MAX3100_SPI_TXD_PORT |= MAX3100_SPI_TXD_BIT; \
- else \
- MAX3100_SPI_TXD_PORT &= ~MAX3100_SPI_TXD_BIT; \
- } while(0)
-
-#define MAX3100_SPI_CLK(x) \
- do { \
- if (x) \
- MAX3100_SPI_CLK_PORT |= MAX3100_SPI_CLK_BIT; \
- else \
- MAX3100_SPI_CLK_PORT &= ~MAX3100_SPI_CLK_BIT; \
- } while(0)
-
-#define MAX3100_SPI_CLK_TOGGLE() (MAX3100_SPI_CLK_PORT ^= MAX3100_SPI_CLK_BIT)
-
-#define MAX3100_CS(x) \
- do { \
- if (x) \
- MAX3100_CS_PORT |= MAX3100_CS_BIT; \
- else \
- MAX3100_CS_PORT &= ~MAX3100_CS_BIT; \
- } while(0)
-
-/**************************************************************/
-
-/* MAX3100 definitions */
-
-#define MAX3100_WC (3 << 14) /* write configuration */
-#define MAX3100_RC (1 << 14) /* read configuration */
-#define MAX3100_WD (2 << 14) /* write data */
-#define MAX3100_RD (0 << 14) /* read data */
-
-/* configuration register bits */
-#define MAX3100_FEN (1 << 13) /* FIFO enable */
-#define MAX3100_SHDN (1 << 12) /* shutdown bit */
-#define MAX3100_TM (1 << 11) /* T bit irq mask */
-#define MAX3100_RM (1 << 10) /* R bit irq mask */
-#define MAX3100_PM (1 << 9) /* P bit irq mask */
-#define MAX3100_RAM (1 << 8) /* mask for RA/FE bit */
-#define MAX3100_IR (1 << 7) /* IRDA timing mode */
-#define MAX3100_ST (1 << 6) /* transmit stop bit */
-#define MAX3100_PE (1 << 5) /* parity enable bit */
-#define MAX3100_L (1 << 4) /* Length bit */
-#define MAX3100_B_MASK (0x000F) /* baud rate bits mask */
-#define MAX3100_B(x) ((x) & 0x000F) /* baud rate select bits */
-
-/* data register bits (write) */
-#define MAX3100_TE (1 << 10) /* transmit enable bit (active low) */
-#define MAX3100_RTS (1 << 9) /* request-to-send bit (inverted ~RTS pin) */
-
-/* data register bits (read) */
-#define MAX3100_RA (1 << 10) /* receiver activity when in shutdown mode */
-#define MAX3100_FE (1 << 10) /* framing error when in normal mode */
-#define MAX3100_CTS (1 << 9) /* clear-to-send bit (inverted ~CTS pin) */
-
-/* data register bits (both directions) */
-#define MAX3100_R (1 << 15) /* receive bit */
-#define MAX3100_T (1 << 14) /* transmit bit */
-#define MAX3100_P (1 << 8) /* parity bit */
-#define MAX3100_D_MASK 0x00FF /* data bits mask */
-#define MAX3100_D(x) ((x) & 0x00FF) /* data bits */
-
-/* these definitions are valid only for fOSC = 3.6864MHz */
-#define MAX3100_B_230400 MAX3100_B(0)
-#define MAX3100_B_115200 MAX3100_B(1)
-#define MAX3100_B_57600 MAX3100_B(2)
-#define MAX3100_B_38400 MAX3100_B(9)
-#define MAX3100_B_19200 MAX3100_B(10)
-#define MAX3100_B_9600 MAX3100_B(11)
-#define MAX3100_B_4800 MAX3100_B(12)
-#define MAX3100_B_2400 MAX3100_B(13)
-#define MAX3100_B_1200 MAX3100_B(14)
-#define MAX3100_B_600 MAX3100_B(15)
-
-/**************************************************************/
-
-static inline unsigned int max3100_transfer(unsigned int val)
-{
- unsigned int rx;
- int b;
-
- MAX3100_SPI_CLK(0);
- MAX3100_CS(0);
-
- rx = 0; b = 16;
- while (--b >= 0) {
- MAX3100_SPI_TXD(val & 0x8000);
- val <<= 1;
- MAX3100_SPI_CLK_TOGGLE();
- udelay(1);
- rx <<= 1;
- if (MAX3100_SPI_RXD())
- rx |= 1;
- MAX3100_SPI_CLK_TOGGLE();
- udelay(1);
- }
-
- MAX3100_SPI_CLK(1);
- MAX3100_CS(1);
-
- return rx;
-}
-
-/**************************************************************/
-
-/* must be power of 2 */
-#define RXFIFO_SZ 16
-
-static int rxfifo_cnt;
-static int rxfifo_in;
-static int rxfifo_out;
-static unsigned char rxfifo_buf[16];
-
-static void max3100_serial_putc_raw(int c)
-{
- unsigned int rx;
-
- while (((rx = max3100_transfer(MAX3100_RC)) & MAX3100_T) == 0)
- WATCHDOG_RESET();
-
- rx = max3100_transfer(MAX3100_WD | (c & 0xff));
- if ((rx & MAX3100_RD) != 0 && rxfifo_cnt < RXFIFO_SZ) {
- rxfifo_cnt++;
- rxfifo_buf[rxfifo_in++] = rx & 0xff;
- rxfifo_in &= RXFIFO_SZ - 1;
- }
-}
-
-static int max3100_serial_getc(void)
-{
- int c;
- unsigned int rx;
-
- while (rxfifo_cnt == 0) {
- rx = max3100_transfer(MAX3100_RD);
- if ((rx & MAX3100_R) != 0) {
- do {
- rxfifo_cnt++;
- rxfifo_buf[rxfifo_in++] = rx & 0xff;
- rxfifo_in &= RXFIFO_SZ - 1;
-
- if (rxfifo_cnt >= RXFIFO_SZ)
- break;
- } while (((rx = max3100_transfer(MAX3100_RD)) & MAX3100_R) != 0);
- }
- WATCHDOG_RESET();
- }
-
- rxfifo_cnt--;
- c = rxfifo_buf[rxfifo_out++];
- rxfifo_out &= RXFIFO_SZ - 1;
- return c;
-}
-
-static int max3100_serial_tstc(void)
-{
- unsigned int rx;
-
- if (rxfifo_cnt > 0)
- return 1;
-
- rx = max3100_transfer(MAX3100_RD);
- if ((rx & MAX3100_R) == 0)
- return 0;
-
- do {
- rxfifo_cnt++;
- rxfifo_buf[rxfifo_in++] = rx & 0xff;
- rxfifo_in &= RXFIFO_SZ - 1;
-
- if (rxfifo_cnt >= RXFIFO_SZ)
- break;
- } while (((rx = max3100_transfer(MAX3100_RD)) & MAX3100_R) != 0);
-
- return 1;
-}
-
-static int max3100_serial_init(void)
-{
- unsigned int wconf, rconf;
- int i;
-
- wconf = 0;
-
- /* Set baud rate */
- switch (gd->baudrate) {
- case 1200:
- wconf = MAX3100_B_1200;
- break;
- case 2400:
- wconf = MAX3100_B_2400;
- break;
- case 4800:
- wconf = MAX3100_B_4800;
- break;
- case 9600:
- wconf = MAX3100_B_9600;
- break;
- case 19200:
- wconf = MAX3100_B_19200;
- break;
- case 38400:
- wconf = MAX3100_B_38400;
- break;
- case 57600:
- wconf = MAX3100_B_57600;
- break;
- default:
- case 115200:
- wconf = MAX3100_B_115200;
- break;
- case 230400:
- wconf = MAX3100_B_230400;
- break;
- }
-
- /* try for 10ms, with a 100us gap */
- for (i = 0; i < 10000; i += 100) {
-
- max3100_transfer(MAX3100_WC | wconf);
- rconf = max3100_transfer(MAX3100_RC) & 0x3fff;
-
- if (rconf == wconf)
- break;
- udelay(100);
- }
-
- rxfifo_in = rxfifo_out = rxfifo_cnt = 0;
-
- return (0);
-}
-
-static void max3100_serial_putc(const char c)
-{
- if (c == '\n')
- max3100_serial_putc_raw('\r');
-
- max3100_serial_putc_raw(c);
-}
-
-static void max3100_serial_puts(const char *s)
-{
- while (*s)
- max3100_serial_putc_raw(*s++);
-}
-
-static void max3100_serial_setbrg(void)
-{
-}
-
-static struct serial_device max3100_serial_drv = {
- .name = "max3100_serial",
- .start = max3100_serial_init,
- .stop = NULL,
- .setbrg = max3100_serial_setbrg,
- .putc = max3100_serial_putc,
- .puts = max3100_serial_puts,
- .getc = max3100_serial_getc,
- .tstc = max3100_serial_tstc,
-};
-
-void max3100_serial_initialize(void)
-{
- serial_register(&max3100_serial_drv);
-}
-
-__weak struct serial_device *default_serial_console(void)
-{
- return &max3100_serial_drv;
-}
projects / oweals / u-boot.git / commitdiff