| // 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 | UART_LCR_DLAB); |
| 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"); |
