[PATCH v12 1/2] serial: exar: split out the exar code from 8250_pci
From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Date: 2017-01-29 22:22:36
From: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk> Add the serial driver for the Exar chips. And also register the platform device for the GPIO provided by the Exar chips. Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk> --- v11 was my mistake. sent a wip branch by mistake. drivers/tty/serial/8250/8250_exar.c | 395 ++++++++++++++++++++++++++++++++++++ drivers/tty/serial/8250/Kconfig | 4 + drivers/tty/serial/8250/Makefile | 1 + 3 files changed, 400 insertions(+) create mode 100644 drivers/tty/serial/8250/8250_exar.c
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
new file mode 100644
index 0000000..5de8322
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_exar.c@@ -0,0 +1,395 @@ +/* + * 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 *, + const struct exar8250_board *, + 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, + const struct exar8250_board *board, int idx, + unsigned int offset, struct uart_8250_port *port) +{ + 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, + const struct exar8250_board *board, + 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, board, idx, offset, port); +} + +static int +pci_xr17c154_setup(struct exar8250 *priv, struct pci_dev *pcidev, + const struct exar8250_board *board, + 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, board, 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, + const struct exar8250_board *board, + struct uart_8250_port *port, int idx) +{ + 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, board, 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; + 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, board, &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>");
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index c0bf996..2573ded 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig@@ -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
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 850e721..2f30f9e 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile@@ -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
--
1.9.1