diff options
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/serial/Makefile | 1 | ||||
| -rw-r--r-- | drivers/serial/serial_octeon_bootcmd.c | 182 |
3 files changed, 194 insertions, 0 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index b42bc7336f..6d1c4530dd 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -788,6 +788,17 @@ config MSM_SERIAL for example APQ8016 and MSM8916. Single baudrate is supported in current implementation (115200). +config OCTEON_SERIAL_BOOTCMD + bool "MIPS Octeon PCI remote bootcmd input" + depends on ARCH_OCTEON + depends on DM_SERIAL + select SYS_IS_IN_ENV + select CONSOLE_MUX + help + This driver supports remote input over the PCIe bus from a host + to U-Boot for entering commands. It is utilized by the host + commands 'oct-remote-load' and 'oct-remote-bootcmd'. + config OCTEON_SERIAL_PCIE_CONSOLE bool "MIPS Octeon PCIe remote console" depends on ARCH_OCTEON diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index 4900e9cb27..6c0fdca586 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -66,6 +66,7 @@ obj-$(CONFIG_MSM_SERIAL) += serial_msm.o obj-$(CONFIG_MVEBU_A3700_UART) += serial_mvebu_a3700.o obj-$(CONFIG_MPC8XX_CONS) += serial_mpc8xx.o obj-$(CONFIG_NULLDEV_SERIAL) += serial_nulldev.o +obj-$(CONFIG_OCTEON_SERIAL_BOOTCMD) += serial_octeon_bootcmd.o obj-$(CONFIG_OCTEON_SERIAL_PCIE_CONSOLE) += serial_octeon_pcie_console.o obj-$(CONFIG_OWL_SERIAL) += serial_owl.o obj-$(CONFIG_OMAP_SERIAL) += serial_omap.o diff --git a/drivers/serial/serial_octeon_bootcmd.c b/drivers/serial/serial_octeon_bootcmd.c new file mode 100644 index 0000000000..4bcff77eb8 --- /dev/null +++ b/drivers/serial/serial_octeon_bootcmd.c @@ -0,0 +1,182 @@ +// 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), +}; |