u-boot/drivers/serial/serial_octeon_pcie_console.c

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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/io.h>
#include <mach/cvmx-regs.h>
#include <mach/cvmx-bootmem.h>
#define DRIVER_NAME "pci-console"
#define OCTEONTX_PCIE_CONSOLE_NAME_LEN 16
/* Current versions */
#define OCTEON_PCIE_CONSOLE_MAJOR_VERSION 1
#define OCTEON_PCIE_CONSOLE_MINOR_VERSION 0
#define OCTEON_PCIE_CONSOLE_BLOCK_NAME "__pci_console"
/*
* Structure that defines a single console.
* Note: when read_index == write_index, the buffer is empty.
* The actual usable size of each console is console_buf_size -1;
*/
struct octeon_pcie_console {
u64 input_base_addr;
u32 input_read_index;
u32 input_write_index;
u64 output_base_addr;
u32 output_read_index;
u32 output_write_index;
u32 lock;
u32 buf_size;
};
/*
* This is the main container structure that contains all the information
* about all PCI consoles. The address of this structure is passed to various
* routines that operation on PCI consoles.
*/
struct octeon_pcie_console_desc {
u32 major_version;
u32 minor_version;
u32 lock;
u32 flags;
u32 num_consoles;
u32 pad;
/* must be 64 bit aligned here... */
/* Array of addresses of octeon_pcie_console_t structures */
u64 console_addr_array[0];
/* Implicit storage for console_addr_array */
};
struct octeon_pcie_console_priv {
struct octeon_pcie_console *console;
int console_num;
bool console_active;
};
/* Flag definitions for read/write functions */
enum {
/*
* If set, read/write functions won't block waiting for space or data.
* For reads, 0 bytes may be read, and for writes not all of the
* supplied data may be written.
*/
OCT_PCI_CON_FLAG_NONBLOCK = 1 << 0,
};
static int buffer_free_bytes(u32 buffer_size, u32 wr_idx, u32 rd_idx)
{
if (rd_idx >= buffer_size || wr_idx >= buffer_size)
return -1;
return ((buffer_size - 1) - (wr_idx - rd_idx)) % buffer_size;
}
static int buffer_avail_bytes(u32 buffer_size, u32 wr_idx, u32 rd_idx)
{
if (rd_idx >= buffer_size || wr_idx >= buffer_size)
return -1;
return buffer_size - 1 - buffer_free_bytes(buffer_size, wr_idx, rd_idx);
}
static int buffer_read_avail(struct udevice *dev, unsigned int console_num)
{
struct octeon_pcie_console_priv *priv = dev_get_priv(dev);
struct octeon_pcie_console *cons_ptr = priv->console;
int avail;
avail = buffer_avail_bytes(cons_ptr->buf_size,
cons_ptr->input_write_index,
cons_ptr->input_read_index);
if (avail >= 0)
return avail;
return 0;
}
static int octeon_pcie_console_read(struct udevice *dev,
unsigned int console_num, char *buffer,
int buffer_size, u32 flags)
{
struct octeon_pcie_console_priv *priv = dev_get_priv(dev);
struct octeon_pcie_console *cons_ptr = priv->console;
int avail;
char *buf_ptr;
int bytes_read;
int read_size;
buf_ptr = (char *)cvmx_phys_to_ptr(cons_ptr->input_base_addr);
avail = buffer_avail_bytes(cons_ptr->buf_size,
cons_ptr->input_write_index,
cons_ptr->input_read_index);
if (avail < 0)
return avail;
if (!(flags & OCT_PCI_CON_FLAG_NONBLOCK)) {
/* Wait for some data to be available */
while (0 == (avail = buffer_avail_bytes(cons_ptr->buf_size,
cons_ptr->input_write_index,
cons_ptr->input_read_index))) {
mdelay(10);
schedule();
}
}
bytes_read = 0;
/* Don't overflow the buffer passed to us */
read_size = min_t(int, avail, buffer_size);
/* Limit ourselves to what we can input in a contiguous block */
if (cons_ptr->input_read_index + read_size >= cons_ptr->buf_size)
read_size = cons_ptr->buf_size - cons_ptr->input_read_index;
memcpy(buffer, buf_ptr + cons_ptr->input_read_index, read_size);
cons_ptr->input_read_index =
(cons_ptr->input_read_index + read_size) % cons_ptr->buf_size;
bytes_read += read_size;
/* Mark the PCIe console to be active from now on */
if (bytes_read)
priv->console_active = true;
return bytes_read;
}
static int octeon_pcie_console_write(struct udevice *dev,
unsigned int console_num,
const char *buffer,
int bytes_to_write, u32 flags)
{
struct octeon_pcie_console_priv *priv = dev_get_priv(dev);
struct octeon_pcie_console *cons_ptr = priv->console;
int avail;
char *buf_ptr;
int bytes_written;
buf_ptr = (char *)cvmx_phys_to_ptr(cons_ptr->output_base_addr);
bytes_written = 0;
while (bytes_to_write > 0) {
avail = buffer_free_bytes(cons_ptr->buf_size,
cons_ptr->output_write_index,
cons_ptr->output_read_index);
if (avail > 0) {
int write_size = min_t(int, avail, bytes_to_write);
/*
* Limit ourselves to what we can output in a contiguous
* block
*/
if (cons_ptr->output_write_index + write_size >=
cons_ptr->buf_size) {
write_size = cons_ptr->buf_size -
cons_ptr->output_write_index;
}
memcpy(buf_ptr + cons_ptr->output_write_index,
buffer + bytes_written, write_size);
/*
* Make sure data is visible before changing write
* index
*/
CVMX_SYNCW;
cons_ptr->output_write_index =
(cons_ptr->output_write_index + write_size) %
cons_ptr->buf_size;
bytes_to_write -= write_size;
bytes_written += write_size;
} else if (avail == 0) {
/*
* Check to see if we should wait for room, or return
* after a partial write
*/
if (flags & OCT_PCI_CON_FLAG_NONBLOCK)
goto done;
schedule();
mdelay(10); /* Delay if we are spinning */
} else {
bytes_written = -1;
goto done;
}
}
done:
return bytes_written;
}
static struct octeon_pcie_console_desc *octeon_pcie_console_init(int num_consoles,
int buffer_size)
{
struct octeon_pcie_console_desc *cons_desc_ptr;
struct octeon_pcie_console *cons_ptr;
s64 addr;
u64 avail_addr;
int alloc_size;
int i;
/* Compute size required for pci console structure */
alloc_size = num_consoles *
(buffer_size * 2 + sizeof(struct octeon_pcie_console) +
sizeof(u64)) + sizeof(struct octeon_pcie_console_desc);
/*
* Allocate memory for the consoles. This must be in the range
* addresssible by the bootloader.
* Try to do so in a manner which minimizes fragmentation. We try to
* put it at the top of DDR0 or bottom of DDR2 first, and only do
* generic allocation if those fail
*/
addr = cvmx_bootmem_phy_named_block_alloc(alloc_size,
OCTEON_DDR0_SIZE - alloc_size - 128,
OCTEON_DDR0_SIZE, 128,
OCTEON_PCIE_CONSOLE_BLOCK_NAME,
CVMX_BOOTMEM_FLAG_END_ALLOC);
if (addr < 0) {
addr = cvmx_bootmem_phy_named_block_alloc(alloc_size, 0,
0x1fffffff, 128,
OCTEON_PCIE_CONSOLE_BLOCK_NAME,
CVMX_BOOTMEM_FLAG_END_ALLOC);
}
if (addr < 0)
return 0;
cons_desc_ptr = cvmx_phys_to_ptr(addr);
/* Clear entire alloc'ed memory */
memset(cons_desc_ptr, 0, alloc_size);
/* Initialize as locked until we are done */
cons_desc_ptr->lock = 1;
CVMX_SYNCW;
cons_desc_ptr->num_consoles = num_consoles;
cons_desc_ptr->flags = 0;
cons_desc_ptr->major_version = OCTEON_PCIE_CONSOLE_MAJOR_VERSION;
cons_desc_ptr->minor_version = OCTEON_PCIE_CONSOLE_MINOR_VERSION;
avail_addr = addr + sizeof(struct octeon_pcie_console_desc) +
num_consoles * sizeof(u64);
for (i = 0; i < num_consoles; i++) {
cons_desc_ptr->console_addr_array[i] = avail_addr;
cons_ptr = (void *)cons_desc_ptr->console_addr_array[i];
avail_addr += sizeof(struct octeon_pcie_console);
cons_ptr->input_base_addr = avail_addr;
avail_addr += buffer_size;
cons_ptr->output_base_addr = avail_addr;
avail_addr += buffer_size;
cons_ptr->buf_size = buffer_size;
}
CVMX_SYNCW;
cons_desc_ptr->lock = 0;
return cvmx_phys_to_ptr(addr);
}
static int octeon_pcie_console_getc(struct udevice *dev)
{
char c;
octeon_pcie_console_read(dev, 0, &c, 1, 0);
return c;
}
static int octeon_pcie_console_putc(struct udevice *dev, const char c)
{
struct octeon_pcie_console_priv *priv = dev_get_priv(dev);
if (priv->console_active)
octeon_pcie_console_write(dev, 0, (char *)&c, 1, 0);
return 0;
}
static int octeon_pcie_console_pending(struct udevice *dev, bool input)
{
if (input) {
udelay(100);
return buffer_read_avail(dev, 0) > 0;
}
return 0;
}
static const struct dm_serial_ops octeon_pcie_console_ops = {
.getc = octeon_pcie_console_getc,
.putc = octeon_pcie_console_putc,
.pending = octeon_pcie_console_pending,
};
static int octeon_pcie_console_probe(struct udevice *dev)
{
struct octeon_pcie_console_priv *priv = dev_get_priv(dev);
struct octeon_pcie_console_desc *cons_desc;
int console_count;
int console_size;
int console_num;
/*
* Currently only 1 console is supported. Perhaps we need to add
* a console nexus if more than one needs to be supported.
*/
console_count = 1;
console_size = 1024;
console_num = 0;
cons_desc = octeon_pcie_console_init(console_count, console_size);
priv->console =
cvmx_phys_to_ptr(cons_desc->console_addr_array[console_num]);
debug("PCI console init succeeded, %d consoles, %d bytes each\n",
console_count, console_size);
return 0;
}
static const struct udevice_id octeon_pcie_console_serial_id[] = {
{ .compatible = "marvell,pci-console", },
{ },
};
U_BOOT_DRIVER(octeon_pcie_console) = {
.name = DRIVER_NAME,
.id = UCLASS_SERIAL,
.ops = &octeon_pcie_console_ops,
.of_match = of_match_ptr(octeon_pcie_console_serial_id),
.probe = octeon_pcie_console_probe,
.priv_auto = sizeof(struct octeon_pcie_console_priv),
};