diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_pericom.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_pericom.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_pericom.c b/drivers/tty/serial/8250/8250_pericom.c new file mode 100644 index 000000000000..025b055363c3 --- /dev/null +++ b/drivers/tty/serial/8250/8250_pericom.c @@ -0,0 +1,214 @@ +// 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 | UPF_MAGIC_MULTIPLIER; + 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"); |