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1// SPDX-License-Identifier: GPL-2.02/* Driver for Pericom UART */3 4#include <linux/bits.h>5#include <linux/module.h>6#include <linux/overflow.h>7#include <linux/pci.h>8 9#include "8250.h"10 11#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SDB 0x105112#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2S 0x105313#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_4 0x105a14#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_4 0x105b15#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SDB 0x105c16#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4S 0x105e17#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_8 0x106a18#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_8 0x106b19#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_2DB 0x109120#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_2 0x109321#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4 0x109822#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4DB 0x109923#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_4 0x109b24#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_8 0x10a925#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SMDB 0x10d126#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2SM 0x10d327#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SM 0x10d928#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SMDB 0x10da29#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4SM 0x10dc30#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_8SM 0x10e931#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_1 0x110832#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_2 0x111033#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_2 0x111134#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_4 0x111835#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_4 0x111936#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2S 0x115237#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4S 0x115a38#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_2 0x119039#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_2 0x119140#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_4 0x119841#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_4 0x119942#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2SM 0x11d043#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4SM 0x11d844 45struct pericom8250 {46 void __iomem *virt;47 unsigned int nr;48 int line[];49};50 51static void pericom_do_set_divisor(struct uart_port *port, unsigned int baud,52 unsigned int quot, unsigned int quot_frac)53{54 int scr;55 56 for (scr = 16; scr > 4; scr--) {57 unsigned int maxrate = port->uartclk / scr;58 unsigned int divisor = max(maxrate / baud, 1U);59 int delta = maxrate / divisor - baud;60 61 if (baud > maxrate + baud / 50)62 continue;63 64 if (delta > baud / 50)65 divisor++;66 67 if (divisor > 0xffff)68 continue;69 70 /* Update delta due to possible divisor change */71 delta = maxrate / divisor - baud;72 if (abs(delta) < baud / 50) {73 struct uart_8250_port *up = up_to_u8250p(port);74 int lcr = serial_port_in(port, UART_LCR);75 76 serial_port_out(port, UART_LCR, lcr | UART_LCR_DLAB);77 serial_dl_write(up, divisor);78 serial_port_out(port, 2, 16 - scr);79 serial_port_out(port, UART_LCR, lcr);80 return;81 }82 }83}84 85static int pericom8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)86{87 unsigned int nr, i, bar = 0, maxnr;88 struct pericom8250 *pericom;89 struct uart_8250_port uart;90 int ret;91 92 ret = pcim_enable_device(pdev);93 if (ret)94 return ret;95 96 maxnr = pci_resource_len(pdev, bar) >> 3;97 98 if (pdev->vendor == PCI_VENDOR_ID_PERICOM)99 nr = pdev->device & 0x0f;100 else if (pdev->vendor == PCI_VENDOR_ID_ACCESSIO)101 nr = BIT(((pdev->device & 0x38) >> 3) - 1);102 else103 nr = 1;104 105 pericom = devm_kzalloc(&pdev->dev, struct_size(pericom, line, nr), GFP_KERNEL);106 if (!pericom)107 return -ENOMEM;108 109 pericom->virt = pcim_iomap(pdev, bar, 0);110 if (!pericom->virt)111 return -ENOMEM;112 113 memset(&uart, 0, sizeof(uart));114 115 uart.port.dev = &pdev->dev;116 uart.port.irq = pdev->irq;117 uart.port.private_data = pericom;118 uart.port.iotype = UPIO_PORT;119 uart.port.uartclk = 921600 * 16;120 uart.port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;121 uart.port.set_divisor = pericom_do_set_divisor;122 for (i = 0; i < nr && i < maxnr; i++) {123 unsigned int offset = (i == 3 && nr == 4) ? 0x38 : i * 0x8;124 125 uart.port.iobase = pci_resource_start(pdev, bar) + offset;126 127 dev_dbg(&pdev->dev, "Setup PCI port: port %lx, irq %d, type %d\n",128 uart.port.iobase, uart.port.irq, uart.port.iotype);129 130 pericom->line[i] = serial8250_register_8250_port(&uart);131 if (pericom->line[i] < 0) {132 dev_err(&pdev->dev,133 "Couldn't register serial port %lx, irq %d, type %d, error %d\n",134 uart.port.iobase, uart.port.irq,135 uart.port.iotype, pericom->line[i]);136 break;137 }138 }139 pericom->nr = i;140 141 pci_set_drvdata(pdev, pericom);142 return 0;143}144 145static void pericom8250_remove(struct pci_dev *pdev)146{147 struct pericom8250 *pericom = pci_get_drvdata(pdev);148 unsigned int i;149 150 for (i = 0; i < pericom->nr; i++)151 serial8250_unregister_port(pericom->line[i]);152}153 154static const struct pci_device_id pericom8250_pci_ids[] = {155 /*156 * Pericom PI7C9X795[1248] Uno/Dual/Quad/Octal UART157 * (Only 7954 has an offset jump for port 4)158 */159 { PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7951) },160 { PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7952) },161 { PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7954) },162 { PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7958) },163 164 /*165 * ACCES I/O Products quad166 * (Only 7954 has an offset jump for port 4)167 */168 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SDB) },169 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2S) },170 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_4) },171 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_4) },172 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SDB) },173 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4S) },174 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_8) },175 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_8) },176 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_2DB) },177 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_2) },178 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4) },179 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4DB) },180 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_4) },181 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_8) },182 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SMDB) },183 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2SM) },184 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SM) },185 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SMDB) },186 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4SM) },187 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_8SM) },188 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_1) },189 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_2) },190 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_2) },191 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_4) },192 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_4) },193 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2S) },194 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4S) },195 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_2) },196 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_2) },197 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_4) },198 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_4) },199 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2SM) },200 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4SM) },201 { }202};203MODULE_DEVICE_TABLE(pci, pericom8250_pci_ids);204 205static struct pci_driver pericom8250_pci_driver = {206 .name = "8250_pericom",207 .id_table = pericom8250_pci_ids,208 .probe = pericom8250_probe,209 .remove = pericom8250_remove,210};211module_pci_driver(pericom8250_pci_driver);212 213MODULE_LICENSE("GPL v2");214MODULE_DESCRIPTION("Pericom UART driver");215