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// SPDX-License-Identifier: GPL-2.0
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/mcb.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_8250.h>
#define MEN_UART_ID_Z025 0x19
#define MEN_UART_ID_Z057 0x39
#define MEN_UART_ID_Z125 0x7d
/*
* IP Cores Z025 and Z057 can have up to 4 UART
* The UARTs available are stored in a global
* register saved in physical address + 0x40
* Is saved as follows:
*
* 7 0
* +------+-------+-------+-------+-------+-------+-------+-------+
* |UART4 | UART3 | UART2 | UART1 | U4irq | U3irq | U2irq | U1irq |
* +------+-------+-------+-------+-------+-------+-------+-------+
*/
#define MEN_UART1_MASK 0x01
#define MEN_UART2_MASK 0x02
#define MEN_UART3_MASK 0x04
#define MEN_UART4_MASK 0x08
#define MEN_Z125_UARTS_AVAILABLE 0x01
#define MEN_Z025_MAX_UARTS 4
#define MEN_UART_MEM_SIZE 0x10
#define MEM_UART_REGISTER_SIZE 0x01
#define MEN_Z025_REGISTER_OFFSET 0x40
#define MEN_UART1_OFFSET 0
#define MEN_UART2_OFFSET (MEN_UART1_OFFSET + MEN_UART_MEM_SIZE)
#define MEN_UART3_OFFSET (MEN_UART2_OFFSET + MEN_UART_MEM_SIZE)
#define MEN_UART4_OFFSET (MEN_UART3_OFFSET + MEN_UART_MEM_SIZE)
#define MEN_READ_REGISTER(addr) readb((void *)addr)
#define MAX_PORTS 4
struct serial_8250_men_mcb_data {
int num_ports;
unsigned int line[MAX_PORTS];
unsigned int offset[MAX_PORTS];
};
/*
* The Z125 16550-compatible UART has no fixed base clock assigned
* So, depending on the board we're on, we need to adjust the
* parameter in order to really set the correct baudrate, and
* do so if possible without user interaction
*/
static u32 men_lookup_uartclk(struct mcb_device *mdev)
{
/* use default value if board is not available below */
u32 clkval = 1041666;
dev_info(&mdev->dev, "%s on board %s\n",
dev_name(&mdev->dev),
mdev->bus->name);
if (strncmp(mdev->bus->name, "F075", 4) == 0)
clkval = 1041666;
else if (strncmp(mdev->bus->name, "F216", 4) == 0)
clkval = 1843200;
else if (strncmp(mdev->bus->name, "F210", 4) == 0)
clkval = 115200;
else if (strstr(mdev->bus->name, "215"))
clkval = 1843200;
else
dev_info(&mdev->dev,
"board not detected, using default uartclk\n");
clkval = clkval << 4;
return clkval;
}
static int read_uarts_available_from_register(struct resource *mem_res,
u8 *uarts_available)
{
void __iomem *mem;
int reg_value;
if (!request_mem_region(mem_res->start + MEN_Z025_REGISTER_OFFSET,
MEM_UART_REGISTER_SIZE, KBUILD_MODNAME)) {
return -EBUSY;
}
mem = ioremap(mem_res->start + MEN_Z025_REGISTER_OFFSET,
MEM_UART_REGISTER_SIZE);
if (!mem) {
release_mem_region(mem_res->start + MEN_Z025_REGISTER_OFFSET,
MEM_UART_REGISTER_SIZE);
return -ENOMEM;
}
reg_value = MEN_READ_REGISTER(mem);
iounmap(mem);
release_mem_region(mem_res->start + MEN_Z025_REGISTER_OFFSET,
MEM_UART_REGISTER_SIZE);
*uarts_available = reg_value >> 4;
return 0;
}
static int read_serial_data(struct mcb_device *mdev,
struct resource *mem_res,
struct serial_8250_men_mcb_data *serial_data)
{
u8 uarts_available;
int count = 0;
int mask;
int res;
int i;
res = read_uarts_available_from_register(mem_res, &uarts_available);
if (res < 0)
return res;
for (i = 0; i < MAX_PORTS; i++) {
mask = 0x1 << i;
switch (uarts_available & mask) {
case MEN_UART1_MASK:
serial_data->offset[count] = MEN_UART1_OFFSET;
count++;
break;
case MEN_UART2_MASK:
serial_data->offset[count] = MEN_UART2_OFFSET;
count++;
break;
case MEN_UART3_MASK:
serial_data->offset[count] = MEN_UART3_OFFSET;
count++;
break;
case MEN_UART4_MASK:
serial_data->offset[count] = MEN_UART4_OFFSET;
count++;
break;
default:
return -EINVAL;
}
}
if (count <= 0 || count > MAX_PORTS) {
dev_err(&mdev->dev, "unexpected number of ports: %u\n",
count);
return -ENODEV;
}
serial_data->num_ports = count;
return 0;
}
static int init_serial_data(struct mcb_device *mdev,
struct resource *mem_res,
struct serial_8250_men_mcb_data *serial_data)
{
switch (mdev->id) {
case MEN_UART_ID_Z125:
serial_data->num_ports = 1;
serial_data->offset[0] = 0;
return 0;
case MEN_UART_ID_Z025:
case MEN_UART_ID_Z057:
return read_serial_data(mdev, mem_res, serial_data);
default:
dev_err(&mdev->dev, "no supported device!\n");
return -ENODEV;
}
}
static int serial_8250_men_mcb_probe(struct mcb_device *mdev,
const struct mcb_device_id *id)
{
struct uart_8250_port uart;
struct serial_8250_men_mcb_data *data;
struct resource *mem;
int i;
int res;
mem = mcb_get_resource(mdev, IORESOURCE_MEM);
if (mem == NULL)
return -ENXIO;
data = devm_kzalloc(&mdev->dev,
sizeof(struct serial_8250_men_mcb_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
res = init_serial_data(mdev, mem, data);
if (res < 0)
return res;
dev_dbg(&mdev->dev, "found a 16z%03u with %u ports\n",
mdev->id, data->num_ports);
mcb_set_drvdata(mdev, data);
for (i = 0; i < data->num_ports; i++) {
memset(&uart, 0, sizeof(struct uart_8250_port));
spin_lock_init(&uart.port.lock);
uart.port.flags = UPF_SKIP_TEST |
UPF_SHARE_IRQ |
UPF_BOOT_AUTOCONF |
UPF_IOREMAP;
uart.port.iotype = UPIO_MEM;
uart.port.uartclk = men_lookup_uartclk(mdev);
uart.port.irq = mcb_get_irq(mdev);
uart.port.mapbase = (unsigned long) mem->start
+ data->offset[i];
/* ok, register the port */
res = serial8250_register_8250_port(&uart);
if (res < 0) {
dev_err(&mdev->dev, "unable to register UART port\n");
return res;
}
data->line[i] = res;
dev_info(&mdev->dev, "found MCB UART: ttyS%d\n", data->line[i]);
}
return 0;
}
static void serial_8250_men_mcb_remove(struct mcb_device *mdev)
{
int i;
struct serial_8250_men_mcb_data *data = mcb_get_drvdata(mdev);
if (!data)
return;
for (i = 0; i < data->num_ports; i++)
serial8250_unregister_port(data->line[i]);
}
static const struct mcb_device_id serial_8250_men_mcb_ids[] = {
{ .device = MEN_UART_ID_Z025 },
{ .device = MEN_UART_ID_Z057 },
{ .device = MEN_UART_ID_Z125 },
{ }
};
MODULE_DEVICE_TABLE(mcb, serial_8250_men_mcb_ids);
static struct mcb_driver mcb_driver = {
.driver = {
.name = "8250_men_mcb",
.owner = THIS_MODULE,
},
.probe = serial_8250_men_mcb_probe,
.remove = serial_8250_men_mcb_remove,
.id_table = serial_8250_men_mcb_ids,
};
module_mcb_driver(mcb_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MEN 8250 UART driver");
MODULE_AUTHOR("Michael Moese <michael.moese@men.de");
MODULE_ALIAS("mcb:16z125");
MODULE_ALIAS("mcb:16z025");
MODULE_ALIAS("mcb:16z057");
MODULE_IMPORT_NS(MCB);
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