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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
- * Scott McNutt <smcnutt@psyent.com>
- */
- #include <common.h>
- #include <dm.h>
- #include <errno.h>
- #include <serial.h>
- #include <asm/io.h>
- #include <linux/bitops.h>
- /* data register */
- #define ALTERA_JTAG_RVALID BIT(15) /* Read valid */
- /* control register */
- #define ALTERA_JTAG_AC BIT(10) /* activity indicator */
- #define ALTERA_JTAG_RRDY BIT(12) /* read available */
- #define ALTERA_JTAG_WSPACE(d) ((d) >> 16) /* Write space avail */
- /* Write fifo size. FIXME: this should be extracted with sopc2dts */
- #define ALTERA_JTAG_WRITE_DEPTH 64
- struct altera_jtaguart_regs {
- u32 data; /* Data register */
- u32 control; /* Control register */
- };
- struct altera_jtaguart_plat {
- struct altera_jtaguart_regs *regs;
- };
- static int altera_jtaguart_setbrg(struct udevice *dev, int baudrate)
- {
- return 0;
- }
- static int altera_jtaguart_putc(struct udevice *dev, const char ch)
- {
- struct altera_jtaguart_plat *plat = dev_get_plat(dev);
- struct altera_jtaguart_regs *const regs = plat->regs;
- u32 st = readl(®s->control);
- #ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
- if (!(st & ALTERA_JTAG_AC)) /* no connection yet */
- return -ENETUNREACH;
- #endif
- if (ALTERA_JTAG_WSPACE(st) == 0)
- return -EAGAIN;
- writel(ch, ®s->data);
- return 0;
- }
- static int altera_jtaguart_pending(struct udevice *dev, bool input)
- {
- struct altera_jtaguart_plat *plat = dev_get_plat(dev);
- struct altera_jtaguart_regs *const regs = plat->regs;
- u32 st = readl(®s->control);
- if (input)
- return st & ALTERA_JTAG_RRDY ? 1 : 0;
- else
- return !(ALTERA_JTAG_WSPACE(st) == ALTERA_JTAG_WRITE_DEPTH);
- }
- static int altera_jtaguart_getc(struct udevice *dev)
- {
- struct altera_jtaguart_plat *plat = dev_get_plat(dev);
- struct altera_jtaguart_regs *const regs = plat->regs;
- u32 val;
- val = readl(®s->data);
- if (!(val & ALTERA_JTAG_RVALID))
- return -EAGAIN;
- return val & 0xff;
- }
- static int altera_jtaguart_probe(struct udevice *dev)
- {
- #ifdef CONFIG_ALTERA_JTAG_UART_BYPASS
- struct altera_jtaguart_plat *plat = dev_get_plat(dev);
- struct altera_jtaguart_regs *const regs = plat->regs;
- writel(ALTERA_JTAG_AC, ®s->control); /* clear AC flag */
- #endif
- return 0;
- }
- static int altera_jtaguart_of_to_plat(struct udevice *dev)
- {
- struct altera_jtaguart_plat *plat = dev_get_plat(dev);
- plat->regs = map_physmem(dev_read_addr(dev),
- sizeof(struct altera_jtaguart_regs),
- MAP_NOCACHE);
- return 0;
- }
- static const struct dm_serial_ops altera_jtaguart_ops = {
- .putc = altera_jtaguart_putc,
- .pending = altera_jtaguart_pending,
- .getc = altera_jtaguart_getc,
- .setbrg = altera_jtaguart_setbrg,
- };
- static const struct udevice_id altera_jtaguart_ids[] = {
- { .compatible = "altr,juart-1.0" },
- {}
- };
- U_BOOT_DRIVER(altera_jtaguart) = {
- .name = "altera_jtaguart",
- .id = UCLASS_SERIAL,
- .of_match = altera_jtaguart_ids,
- .of_to_plat = altera_jtaguart_of_to_plat,
- .plat_auto = sizeof(struct altera_jtaguart_plat),
- .probe = altera_jtaguart_probe,
- .ops = &altera_jtaguart_ops,
- };
- #ifdef CONFIG_DEBUG_UART_ALTERA_JTAGUART
- #include <debug_uart.h>
- static inline void _debug_uart_init(void)
- {
- }
- static inline void _debug_uart_putc(int ch)
- {
- struct altera_jtaguart_regs *regs = (void *)CONFIG_DEBUG_UART_BASE;
- while (1) {
- u32 st = readl(®s->control);
- if (ALTERA_JTAG_WSPACE(st))
- break;
- }
- writel(ch, ®s->data);
- }
- DEBUG_UART_FUNCS
- #endif
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