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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2019 Marvell International Ltd.
- * Copyright (C) 2021 Stefan Roese <sr@denx.de>
- */
- #include <dm.h>
- #include <dm/uclass.h>
- #include <errno.h>
- #include <input.h>
- #include <iomux.h>
- #include <log.h>
- #include <serial.h>
- #include <stdio_dev.h>
- #include <string.h>
- #include <watchdog.h>
- #include <linux/delay.h>
- #include <asm/addrspace.h>
- #include <asm/io.h>
- #include <mach/cvmx-regs.h>
- #include <mach/cvmx-bootmem.h>
- #define DRIVER_NAME "pci-bootcmd"
- /*
- * Important:
- * This address cannot be changed as the PCI console tool relies on exactly
- * this value!
- */
- #define BOOTLOADER_PCI_READ_BUFFER_BASE 0x6c000
- #define BOOTLOADER_PCI_READ_BUFFER_SIZE 256
- #define BOOTLOADER_PCI_WRITE_BUFFER_SIZE 256
- #define BOOTLOADER_PCI_READ_BUFFER_STR_LEN \
- (BOOTLOADER_PCI_READ_BUFFER_SIZE - 8)
- #define BOOTLOADER_PCI_WRITE_BUFFER_STR_LEN \
- (BOOTLOADER_PCI_WRITE_BUFFER_SIZE - 8)
- #define BOOTLOADER_PCI_READ_BUFFER_OWNER_ADDR \
- (BOOTLOADER_PCI_READ_BUFFER_BASE + 0)
- #define BOOTLOADER_PCI_READ_BUFFER_LEN_ADDR \
- (BOOTLOADER_PCI_READ_BUFFER_BASE + 4)
- #define BOOTLOADER_PCI_READ_BUFFER_DATA_ADDR \
- (BOOTLOADER_PCI_READ_BUFFER_BASE + 8)
- enum octeon_pci_io_buf_owner {
- /* Must be zero, set when memory cleared */
- OCTEON_PCI_IO_BUF_OWNER_INVALID = 0,
- OCTEON_PCI_IO_BUF_OWNER_OCTEON = 1,
- OCTEON_PCI_IO_BUF_OWNER_HOST = 2,
- };
- /* Structure for bootloader PCI IO buffers */
- struct octeon_pci_io_buf {
- u32 owner;
- u32 len;
- char data[0];
- };
- struct octeon_bootcmd_priv {
- bool started;
- int copy_offset;
- bool eol;
- bool unlocked;
- struct octeon_pci_io_buf *buf;
- };
- static int octeon_bootcmd_pending(struct udevice *dev, bool input)
- {
- struct octeon_bootcmd_priv *priv = dev_get_priv(dev);
- if (!input)
- return 0;
- if (priv->eol)
- return 1;
- CVMX_SYNC;
- if (priv->buf->owner != OCTEON_PCI_IO_BUF_OWNER_OCTEON)
- return 0;
- if (priv->buf->len > priv->copy_offset &&
- (priv->buf->data[priv->copy_offset] != '\0'))
- return 1;
- return 0;
- }
- static int octeon_bootcmd_getc(struct udevice *dev)
- {
- struct octeon_bootcmd_priv *priv = dev_get_priv(dev);
- char c;
- /* There's no EOL for boot commands so we fake it. */
- if (priv->eol) {
- priv->eol = false;
- return '\n';
- }
- while (!octeon_bootcmd_pending(dev, true)) {
- WATCHDOG_RESET();
- /*
- * ToDo:
- * The original code calls octeon_board_poll() here. We may
- * need to implement something similar here.
- */
- udelay(100);
- }
- c = priv->buf->data[priv->copy_offset];
- priv->buf->data[priv->copy_offset++] = '\0';
- if (priv->copy_offset >= min_t(int, CONFIG_SYS_CBSIZE - 1,
- BOOTLOADER_PCI_READ_BUFFER_STR_LEN - 1) ||
- (priv->buf->data[priv->copy_offset] == '\0')) {
- priv->copy_offset = 0;
- priv->buf->len = 0;
- priv->buf->owner = OCTEON_PCI_IO_BUF_OWNER_HOST;
- priv->eol = true;
- CVMX_SYNC;
- }
- return c;
- }
- static const struct dm_serial_ops octeon_bootcmd_ops = {
- .getc = octeon_bootcmd_getc,
- .pending = octeon_bootcmd_pending,
- };
- static int octeon_bootcmd_probe(struct udevice *dev)
- {
- struct octeon_bootcmd_priv *priv = dev_get_priv(dev);
- priv->buf = (void *)CKSEG0ADDR(BOOTLOADER_PCI_READ_BUFFER_BASE);
- memset(priv->buf, 0, BOOTLOADER_PCI_READ_BUFFER_SIZE);
- priv->eol = false;
- /*
- * When the bootcmd console is first started it is started as locked to
- * block any calls sending a command until U-Boot is ready to accept
- * commands. Just before the main loop starts to accept commands the
- * bootcmd console is unlocked.
- */
- if (priv->unlocked)
- priv->buf->owner = OCTEON_PCI_IO_BUF_OWNER_HOST;
- else
- priv->buf->owner = OCTEON_PCI_IO_BUF_OWNER_OCTEON;
- debug("%s called, buffer ptr: 0x%p, owner: %s\n", __func__,
- priv->buf,
- priv->buf->owner == OCTEON_PCI_IO_BUF_OWNER_HOST ?
- "host" : "octeon");
- debug("&priv->copy_offset: 0x%p\n", &priv->copy_offset);
- CVMX_SYNC;
- /*
- * Perhaps reinvestige this: In the original code, "unlocked" etc
- * is set in the octeon_pci_bootcmd_unlock() function called very
- * late.
- */
- priv->buf->owner = OCTEON_PCI_IO_BUF_OWNER_HOST;
- priv->unlocked = true;
- priv->started = true;
- CVMX_SYNC;
- return 0;
- }
- static const struct udevice_id octeon_bootcmd_serial_id[] = {
- { .compatible = "marvell,pci-bootcmd", },
- { },
- };
- U_BOOT_DRIVER(octeon_bootcmd) = {
- .name = DRIVER_NAME,
- .id = UCLASS_SERIAL,
- .ops = &octeon_bootcmd_ops,
- .of_match = of_match_ptr(octeon_bootcmd_serial_id),
- .probe = octeon_bootcmd_probe,
- .priv_auto = sizeof(struct octeon_bootcmd_priv),
- };
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