blob: 95ff10f25d58aa5c7e5db838b76a766245849f90 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/* Driver for Pericom UART */
#include <linux/bits.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/pci.h>
#include "8250.h"
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SDB 0x1051
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2S 0x1053
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_4 0x105a
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_4 0x105b
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SDB 0x105c
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4S 0x105e
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_8 0x106a
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_8 0x106b
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_2DB 0x1091
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_2 0x1093
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4 0x1098
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4DB 0x1099
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_4 0x109b
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_8 0x10a9
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SMDB 0x10d1
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2SM 0x10d3
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SM 0x10d9
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SMDB 0x10da
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4SM 0x10dc
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_8SM 0x10e9
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_1 0x1108
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_2 0x1110
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_2 0x1111
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_4 0x1118
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_4 0x1119
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2S 0x1152
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4S 0x115a
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_2 0x1190
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_2 0x1191
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_4 0x1198
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_4 0x1199
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2SM 0x11d0
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4SM 0x11d8
struct pericom8250 {
void __iomem *virt;
unsigned int nr;
int line[];
};
static void pericom_do_set_divisor(struct uart_port *port, unsigned int baud,
unsigned int quot, unsigned int quot_frac)
{
int scr;
for (scr = 16; scr > 4; scr--) {
unsigned int maxrate = port->uartclk / scr;
unsigned int divisor = max(maxrate / baud, 1U);
int delta = maxrate / divisor - baud;
if (baud > maxrate + baud / 50)
continue;
if (delta > baud / 50)
divisor++;
if (divisor > 0xffff)
continue;
/* Update delta due to possible divisor change */
delta = maxrate / divisor - baud;
if (abs(delta) < baud / 50) {
struct uart_8250_port *up = up_to_u8250p(port);
int lcr = serial_port_in(port, UART_LCR);
serial_port_out(port, UART_LCR, lcr | 0x80);
serial_dl_write(up, divisor);
serial_port_out(port, 2, 16 - scr);
serial_port_out(port, UART_LCR, lcr);
return;
}
}
}
static int pericom8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
unsigned int nr, i, bar = 0, maxnr;
struct pericom8250 *pericom;
struct uart_8250_port uart;
int ret;
ret = pcim_enable_device(pdev);
if (ret)
return ret;
maxnr = pci_resource_len(pdev, bar) >> 3;
if (pdev->vendor == PCI_VENDOR_ID_PERICOM)
nr = pdev->device & 0x0f;
else if (pdev->vendor == PCI_VENDOR_ID_ACCESSIO)
nr = BIT(((pdev->device & 0x38) >> 3) - 1);
else
nr = 1;
pericom = devm_kzalloc(&pdev->dev, struct_size(pericom, line, nr), GFP_KERNEL);
if (!pericom)
return -ENOMEM;
pericom->virt = pcim_iomap(pdev, bar, 0);
if (!pericom->virt)
return -ENOMEM;
memset(&uart, 0, sizeof(uart));
uart.port.dev = &pdev->dev;
uart.port.irq = pdev->irq;
uart.port.private_data = pericom;
uart.port.iotype = UPIO_PORT;
uart.port.uartclk = 921600 * 16;
uart.port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
uart.port.set_divisor = pericom_do_set_divisor;
for (i = 0; i < nr && i < maxnr; i++) {
unsigned int offset = (i == 3 && nr == 4) ? 0x38 : i * 0x8;
uart.port.iobase = pci_resource_start(pdev, bar) + offset;
dev_dbg(&pdev->dev, "Setup PCI port: port %lx, irq %d, type %d\n",
uart.port.iobase, uart.port.irq, uart.port.iotype);
pericom->line[i] = serial8250_register_8250_port(&uart);
if (pericom->line[i] < 0) {
dev_err(&pdev->dev,
"Couldn't register serial port %lx, irq %d, type %d, error %d\n",
uart.port.iobase, uart.port.irq,
uart.port.iotype, pericom->line[i]);
break;
}
}
pericom->nr = i;
pci_set_drvdata(pdev, pericom);
return 0;
}
static void pericom8250_remove(struct pci_dev *pdev)
{
struct pericom8250 *pericom = pci_get_drvdata(pdev);
unsigned int i;
for (i = 0; i < pericom->nr; i++)
serial8250_unregister_port(pericom->line[i]);
}
static const struct pci_device_id pericom8250_pci_ids[] = {
/*
* Pericom PI7C9X795[1248] Uno/Dual/Quad/Octal UART
* (Only 7954 has an offset jump for port 4)
*/
{ PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7951) },
{ PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7952) },
{ PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7954) },
{ PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7958) },
/*
* ACCES I/O Products quad
* (Only 7954 has an offset jump for port 4)
*/
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SDB) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2S) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_4) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_4) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SDB) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4S) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_8) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_8) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_2DB) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_2) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4DB) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_4) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_8) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SMDB) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2SM) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SM) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SMDB) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4SM) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_8SM) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_1) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_2) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_2) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_4) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_4) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2S) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4S) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_2) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_2) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_4) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_4) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2SM) },
{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4SM) },
{ }
};
MODULE_DEVICE_TABLE(pci, pericom8250_pci_ids);
static struct pci_driver pericom8250_pci_driver = {
.name = "8250_pericom",
.id_table = pericom8250_pci_ids,
.probe = pericom8250_probe,
.remove = pericom8250_remove,
};
module_pci_driver(pericom8250_pci_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Pericom UART driver");