serial: exar: split out the exar code from 8250_pci (d0aeaa83) · Commits · 戴 / test

drivers/tty/serial/8250/8250_exar.c

0 → 100644

+396 −0

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		/*
		* Probe module for 8250/16550-type Exar chips PCI serial ports.
		*
		* Based on drivers/tty/serial/8250/8250_pci.c,
		*
		* Copyright (C) 2017 Sudip Mukherjee, All Rights Reserved.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License.
		*/
		#include <linux/io.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/pci.h>
		#include <linux/serial_core.h>
		#include <linux/serial_reg.h>
		#include <linux/slab.h>
		#include <linux/string.h>
		#include <linux/tty.h>
		#include <linux/8250_pci.h>

		#include <asm/byteorder.h>

		#include "8250.h"

		#define PCI_DEVICE_ID_COMMTECH_4224PCIE 0x0020
		#define PCI_DEVICE_ID_COMMTECH_4228PCIE 0x0021
		#define PCI_DEVICE_ID_COMMTECH_4222PCIE 0x0022
		#define PCI_DEVICE_ID_EXAR_XR17V4358 0x4358
		#define PCI_DEVICE_ID_EXAR_XR17V8358 0x8358

		#define UART_EXAR_MPIOINT_7_0 0x8f /* MPIOINT[7:0] */
		#define UART_EXAR_MPIOLVL_7_0 0x90 /* MPIOLVL[7:0] */
		#define UART_EXAR_MPIO3T_7_0 0x91 /* MPIO3T[7:0] */
		#define UART_EXAR_MPIOINV_7_0 0x92 /* MPIOINV[7:0] */
		#define UART_EXAR_MPIOSEL_7_0 0x93 /* MPIOSEL[7:0] */
		#define UART_EXAR_MPIOOD_7_0 0x94 /* MPIOOD[7:0] */
		#define UART_EXAR_MPIOINT_15_8 0x95 /* MPIOINT[15:8] */
		#define UART_EXAR_MPIOLVL_15_8 0x96 /* MPIOLVL[15:8] */
		#define UART_EXAR_MPIO3T_15_8 0x97 /* MPIO3T[15:8] */
		#define UART_EXAR_MPIOINV_15_8 0x98 /* MPIOINV[15:8] */
		#define UART_EXAR_MPIOSEL_15_8 0x99 /* MPIOSEL[15:8] */
		#define UART_EXAR_MPIOOD_15_8 0x9a /* MPIOOD[15:8] */

		struct exar8250;

		/**
		* struct exar8250_board - board information
		* @num_ports: number of serial ports
		* @reg_shift: describes UART register mapping in PCI memory
		*/
		struct exar8250_board {
		unsigned int num_ports;
		unsigned int reg_shift;
		bool has_slave;
		int (setup)(struct exar8250 , struct pci_dev *,
		struct uart_8250_port *, int);
		void (exit)(struct pci_dev pcidev);
		};

		struct exar8250 {
		unsigned int nr;
		struct exar8250_board *board;
		int line[0];
		};

		static int default_setup(struct exar8250 priv, struct pci_dev pcidev,
		int idx, unsigned int offset,
		struct uart_8250_port *port)
		{
		const struct exar8250_board *board = priv->board;
		unsigned int bar = 0;

		port->port.iotype = UPIO_MEM;
		port->port.mapbase = pci_resource_start(pcidev, bar) + offset;
		port->port.membase = pcim_iomap_table(pcidev)[bar] + offset;
		port->port.regshift = board->reg_shift;

		return 0;
		}

		static int
		pci_connect_tech_setup(struct exar8250 priv, struct pci_dev pcidev,
		struct uart_8250_port *port, int idx)
		{
		unsigned int offset = idx * 0x200;
		unsigned int baud = 1843200;

		port->port.uartclk = baud * 16;
		return default_setup(priv, pcidev, idx, offset, port);
		}

		static int
		pci_xr17c154_setup(struct exar8250 priv, struct pci_dev pcidev,
		struct uart_8250_port *port, int idx)
		{
		unsigned int offset = idx * 0x200;
		unsigned int baud = 921600;

		port->port.uartclk = baud * 16;
		return default_setup(priv, pcidev, idx, offset, port);
		}

		static void setup_gpio(u8 __iomem *p)
		{
		writeb(0x00, p + UART_EXAR_MPIOINT_7_0);
		writeb(0x00, p + UART_EXAR_MPIOLVL_7_0);
		writeb(0x00, p + UART_EXAR_MPIO3T_7_0);
		writeb(0x00, p + UART_EXAR_MPIOINV_7_0);
		writeb(0x00, p + UART_EXAR_MPIOSEL_7_0);
		writeb(0x00, p + UART_EXAR_MPIOOD_7_0);
		writeb(0x00, p + UART_EXAR_MPIOINT_15_8);
		writeb(0x00, p + UART_EXAR_MPIOLVL_15_8);
		writeb(0x00, p + UART_EXAR_MPIO3T_15_8);
		writeb(0x00, p + UART_EXAR_MPIOINV_15_8);
		writeb(0x00, p + UART_EXAR_MPIOSEL_15_8);
		writeb(0x00, p + UART_EXAR_MPIOOD_15_8);
		}

		static void *
		xr17v35x_register_gpio(struct pci_dev *pcidev)
		{
		struct platform_device *pdev;

		pdev = platform_device_alloc("gpio_exar", PLATFORM_DEVID_AUTO);
		if (!pdev)
		return NULL;

		platform_set_drvdata(pdev, pcidev);
		if (platform_device_add(pdev) < 0) {
		platform_device_put(pdev);
		return NULL;
		}

		return pdev;
		}

		static int
		pci_xr17v35x_setup(struct exar8250 priv, struct pci_dev pcidev,
		struct uart_8250_port *port, int idx)
		{
		const struct exar8250_board *board = priv->board;
		unsigned int offset = idx * 0x400;
		unsigned int baud = 7812500;
		u8 __iomem *p;
		int ret;

		port->port.uartclk = baud * 16;
		/*
		* Setup the uart clock for the devices on expansion slot to
		* half the clock speed of the main chip (which is 125MHz)
		*/
		if (board->has_slave && idx >= 8)
		port->port.uartclk /= 2;

		p = pci_ioremap_bar(pcidev, 0);
		if (!p)
		return -ENOMEM;

		/* Setup Multipurpose Input/Output pins. */
		if (idx == 0)
		setup_gpio(p);

		writeb(0x00, p + UART_EXAR_8XMODE);
		writeb(UART_FCTR_EXAR_TRGD, p + UART_EXAR_FCTR);
		writeb(128, p + UART_EXAR_TXTRG);
		writeb(128, p + UART_EXAR_RXTRG);
		iounmap(p);

		ret = default_setup(priv, pcidev, idx, offset, port);
		if (ret)
		return ret;

		if (idx == 0)
		port->port.private_data =
		xr17v35x_register_gpio(pcidev);

		return 0;
		}

		static void pci_xr17v35x_exit(struct pci_dev *pcidev)
		{
		struct exar8250 *priv = pci_get_drvdata(pcidev);
		struct uart_8250_port *port = serial8250_get_port(priv->line[0]);
		struct platform_device *pdev = port->port.private_data;

		platform_device_unregister(pdev);
		port->port.private_data = NULL;
		}

		static int
		exar_pci_probe(struct pci_dev pcidev, const struct pci_device_id ent)
		{
		unsigned int nr_ports, i, bar = 0, maxnr;
		struct exar8250_board *board;
		struct uart_8250_port uart;
		struct exar8250 *priv;
		int rc;

		board = (struct exar8250_board *)ent->driver_data;
		if (!board)
		return -EINVAL;

		rc = pcim_enable_device(pcidev);
		if (rc)
		return rc;

		maxnr = pci_resource_len(pcidev, bar) >> (board->reg_shift + 3);

		nr_ports = board->num_ports ? board->num_ports : pcidev->device & 0x0f;

		priv = devm_kzalloc(&pcidev->dev, sizeof(*priv) +
		sizeof(unsigned int) * nr_ports,
		GFP_KERNEL);
		if (!priv)
		return -ENOMEM;

		priv->board = board;

		memset(&uart, 0, sizeof(uart));
		uart.port.flags = UPF_SKIP_TEST \| UPF_BOOT_AUTOCONF \| UPF_SHARE_IRQ
		\| UPF_EXAR_EFR;
		uart.port.irq = pcidev->irq;
		uart.port.dev = &pcidev->dev;

		for (i = 0; i < nr_ports && i < maxnr; i++) {
		rc = board->setup(priv, pcidev, &uart, i);
		if (rc) {
		dev_err(&pcidev->dev, "Failed to setup port %u\n", i);
		break;
		}

		dev_dbg(&pcidev->dev, "Setup PCI port: port %lx, irq %d, type %d\n",
		uart.port.iobase, uart.port.irq, uart.port.iotype);

		priv->line[i] = serial8250_register_8250_port(&uart);
		if (priv->line[i] < 0) {
		dev_err(&pcidev->dev,
		"Couldn't register serial port %lx, irq %d, type %d, error %d\n",
		uart.port.iobase, uart.port.irq,
		uart.port.iotype, priv->line[i]);
		break;
		}
		}
		priv->nr = i;
		pci_set_drvdata(pcidev, priv);
		return 0;
		}

		static void exar_pci_remove(struct pci_dev *pcidev)
		{
		struct exar8250 *priv = pci_get_drvdata(pcidev);
		unsigned int i;

		for (i = 0; i < priv->nr; i++)
		serial8250_unregister_port(priv->line[i]);

		if (priv->board->exit)
		priv->board->exit(pcidev);
		}

		static int __maybe_unused exar_suspend(struct device *dev)
		{
		struct pci_dev *pcidev = to_pci_dev(dev);
		struct exar8250 *priv = pci_get_drvdata(pcidev);
		unsigned int i;

		for (i = 0; i < priv->nr; i++)
		if (priv->line[i] >= 0)
		serial8250_suspend_port(priv->line[i]);

		/* Ensure that every init quirk is properly torn down */
		if (priv->board->exit)
		priv->board->exit(pcidev);

		return 0;
		}

		static int __maybe_unused exar_resume(struct device *dev)
		{
		struct pci_dev *pcidev = to_pci_dev(dev);
		struct exar8250 *priv = pci_get_drvdata(pcidev);
		unsigned int i;

		for (i = 0; i < priv->nr; i++)
		if (priv->line[i] >= 0)
		serial8250_resume_port(priv->line[i]);

		return 0;
		}

		static SIMPLE_DEV_PM_OPS(exar_pci_pm, exar_suspend, exar_resume);

		static const struct exar8250_board pbn_connect = {
		.setup = pci_connect_tech_setup,
		};

		static const struct exar8250_board pbn_exar_ibm_saturn = {
		.num_ports = 1,
		.setup = pci_xr17c154_setup,
		};

		static const struct exar8250_board pbn_exar_XR17C15x = {
		.setup = pci_xr17c154_setup,
		};

		static const struct exar8250_board pbn_exar_XR17V35x = {
		.setup = pci_xr17v35x_setup,
		.exit = pci_xr17v35x_exit,
		};

		static const struct exar8250_board pbn_exar_XR17V4358 = {
		.num_ports = 12,
		.has_slave = true,
		.setup = pci_xr17v35x_setup,
		.exit = pci_xr17v35x_exit,
		};

		static const struct exar8250_board pbn_exar_XR17V8358 = {
		.num_ports = 16,
		.has_slave = true,
		.setup = pci_xr17v35x_setup,
		.exit = pci_xr17v35x_exit,
		};

		#define CONNECT_DEVICE(devid, sdevid, bd) { \
		PCI_DEVICE_SUB( \
		PCI_VENDOR_ID_EXAR, \
		PCI_DEVICE_ID_EXAR_##devid, \
		PCI_SUBVENDOR_ID_CONNECT_TECH, \
		PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_##sdevid), 0, 0, \
		(kernel_ulong_t)&bd \
		}

		#define EXAR_DEVICE(vend, devid, bd) { \
		PCI_VDEVICE(vend, PCI_DEVICE_ID_##devid), (kernel_ulong_t)&bd \
		}

		#define IBM_DEVICE(devid, sdevid, bd) { \
		PCI_DEVICE_SUB( \
		PCI_VENDOR_ID_EXAR, \
		PCI_DEVICE_ID_EXAR_##devid, \
		PCI_VENDOR_ID_IBM, \
		PCI_SUBDEVICE_ID_IBM_##sdevid), 0, 0, \
		(kernel_ulong_t)&bd \
		}

		static struct pci_device_id exar_pci_tbl[] = {
		CONNECT_DEVICE(XR17C152, UART_2_232, pbn_connect),
		CONNECT_DEVICE(XR17C154, UART_4_232, pbn_connect),
		CONNECT_DEVICE(XR17C158, UART_8_232, pbn_connect),
		CONNECT_DEVICE(XR17C152, UART_1_1, pbn_connect),
		CONNECT_DEVICE(XR17C154, UART_2_2, pbn_connect),
		CONNECT_DEVICE(XR17C158, UART_4_4, pbn_connect),
		CONNECT_DEVICE(XR17C152, UART_2, pbn_connect),
		CONNECT_DEVICE(XR17C154, UART_4, pbn_connect),
		CONNECT_DEVICE(XR17C158, UART_8, pbn_connect),
		CONNECT_DEVICE(XR17C152, UART_2_485, pbn_connect),
		CONNECT_DEVICE(XR17C154, UART_4_485, pbn_connect),
		CONNECT_DEVICE(XR17C158, UART_8_485, pbn_connect),

		IBM_DEVICE(XR17C152, SATURN_SERIAL_ONE_PORT, pbn_exar_ibm_saturn),

		/* Exar Corp. XR17C15[248] Dual/Quad/Octal UART */
		EXAR_DEVICE(EXAR, EXAR_XR17C152, pbn_exar_XR17C15x),
		EXAR_DEVICE(EXAR, EXAR_XR17C154, pbn_exar_XR17C15x),
		EXAR_DEVICE(EXAR, EXAR_XR17C158, pbn_exar_XR17C15x),

		/* Exar Corp. XR17V[48]35[248] Dual/Quad/Octal/Hexa PCIe UARTs */
		EXAR_DEVICE(EXAR, EXAR_XR17V352, pbn_exar_XR17V35x),
		EXAR_DEVICE(EXAR, EXAR_XR17V354, pbn_exar_XR17V35x),
		EXAR_DEVICE(EXAR, EXAR_XR17V358, pbn_exar_XR17V35x),
		EXAR_DEVICE(EXAR, EXAR_XR17V4358, pbn_exar_XR17V4358),
		EXAR_DEVICE(EXAR, EXAR_XR17V8358, pbn_exar_XR17V8358),
		EXAR_DEVICE(COMMTECH, COMMTECH_4222PCIE, pbn_exar_XR17V35x),
		EXAR_DEVICE(COMMTECH, COMMTECH_4224PCIE, pbn_exar_XR17V35x),
		EXAR_DEVICE(COMMTECH, COMMTECH_4228PCIE, pbn_exar_XR17V35x),
		{ 0, }
		};
		MODULE_DEVICE_TABLE(pci, exar_pci_tbl);

		static struct pci_driver exar_pci_driver = {
		.name = "exar_serial",
		.probe = exar_pci_probe,
		.remove = exar_pci_remove,
		.driver = {
		.pm = &exar_pci_pm,
		},
		.id_table = exar_pci_tbl,
		};
		module_pci_driver(exar_pci_driver);

		MODULE_LICENSE("GPL");
		MODULE_DESCRIPTION("Exar Serial Dricer");
		MODULE_AUTHOR("Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>");

drivers/tty/serial/8250/Kconfig

+4 −0

Original line number	Diff line number	Diff line
		@@ -127,6 +127,10 @@ config SERIAL_8250_PCI
		Note that serial ports on NetMos 9835 Multi-I/O cards are handled
		by the parport_serial driver, enabled with CONFIG_PARPORT_SERIAL.

		config SERIAL_8250_EXAR
		tristate "8250/16550 PCI device support"
		depends on SERIAL_8250_PCI

		config SERIAL_8250_HP300
		tristate
		depends on SERIAL_8250 && HP300

drivers/tty/serial/8250/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -10,6 +10,7 @@ obj-$(CONFIG_SERIAL_8250) += 8250.o 8250_base.o
		8250_base-$(CONFIG_SERIAL_8250_FINTEK) += 8250_fintek.o
		obj-$(CONFIG_SERIAL_8250_GSC) += 8250_gsc.o
		obj-$(CONFIG_SERIAL_8250_PCI) += 8250_pci.o
		obj-$(CONFIG_SERIAL_8250_EXAR) += 8250_exar.o
		obj-$(CONFIG_SERIAL_8250_HP300) += 8250_hp300.o
		obj-$(CONFIG_SERIAL_8250_CS) += serial_cs.o
		obj-$(CONFIG_SERIAL_8250_ACORN) += 8250_acorn.o

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