Date:   Sun,  8 Jan 2017 22:32:06 +0000
From:   Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        gnomes@...rguk.ukuu.org.uk
Cc:     linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-gpio@...r.kernel.org,
        Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
Subject: [PATCH v8 2/3] serial: exar: split out the exar code from 8250_pci

From: Sudip Mukherjee <sudip.mukherjee@...ethink.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@...ethink.co.uk>
---

v8:
* headers arranged in alphabetical order, only 8250_pci.h had to be
placed last.
* pci_dev removed from exar8250, and device was also not needed.
* maxnr and iomaps moved to probe and only checked once now.
* new member of has_slave in exar8250_board and removed the inline
function.
* new helper function to setup gpio
* new helper function to register gpio
* custom macros used in pci_device_id

Andy,
I hope its ok this time. All your comments taken into account. :)
I could not think of any other way to reduce the number of boards.

 drivers/tty/serial/8250/8250_exar.c | 454 ++++++++++++++++++++++++++++++++++++
 drivers/tty/serial/8250/Kconfig     |   5 +
 drivers/tty/serial/8250/Makefile    |   1 +
 3 files changed, 460 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..192db37
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -0,0 +1,454 @@
+/*
+ *  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.
+ */
+
+#undef DEBUG
+
+#include <asm/byteorder.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#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 "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] */
+
+#define PCI_NUM_BAR_RESOURCES	6
+
+struct exar8250;
+
+struct exar8250_board {
+	unsigned int num_ports;
+	unsigned int base_baud;
+	unsigned int uart_offset; /* the space between channels */
+	/*
+	 * reg_shift:  describes how the UART registers are mapped
+	 * to PCI memory by the card.
+	 */
+	unsigned int reg_shift;
+	unsigned int first_offset;
+	bool has_slave;
+	int	(*setup)(struct exar8250 *, struct pci_dev *,
+			 const struct exar8250_board *,
+			 struct uart_8250_port *, int);
+	void	(*exit)(struct pci_dev *dev);
+};
+
+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,
+			 struct uart_8250_port *port, int idx)
+{
+	unsigned int offset = board->first_offset, bar = 0;
+
+	offset += idx * board->uart_offset;
+
+	port->port.iotype = UPIO_MEM;
+	port->port.iobase = 0;
+	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_xr17c154_setup(struct exar8250 *priv, struct pci_dev *pcidev,
+		   const struct exar8250_board *board,
+		   struct uart_8250_port *port, int idx)
+{
+	port->port.flags |= UPF_EXAR_EFR;
+	return default_setup(priv, pcidev, board, port, idx);
+}
+
+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 (void *)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)
+{
+	u8 __iomem *p;
+	int ret;
+
+	p = pci_ioremap_bar(pcidev, 0);
+	if (!p)
+		return -ENOMEM;
+
+	port->port.flags |= UPF_EXAR_EFR;
+
+	/*
+	 * 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 = (7812500 * 16 / 2);
+
+	/*
+	 * 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, port, idx);
+	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 *dev)
+{
+	struct exar8250 *priv = pci_get_drvdata(dev);
+	struct uart_8250_port *port = serial8250_get_port(priv->line[0]);
+	struct platform_device *pdev = port->port.private_data;
+
+	if (pdev) {
+		platform_device_unregister(pdev);
+		port->port.private_data = NULL;
+	}
+}
+
+static int
+exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
+{
+	int rc;
+	struct exar8250_board *board;
+	struct uart_8250_port uart;
+	struct exar8250 *priv;
+	unsigned int nr_ports, i, bar = 0, maxnr;
+
+	board = (struct exar8250_board *)ent->driver_data;
+
+	rc = pcim_enable_device(pcidev);
+	if (rc)
+		return rc;
+
+	if (!pcim_iomap(pcidev, bar, 0) && !pcim_iomap_table(pcidev))
+		return -ENOMEM;
+
+	maxnr = (pci_resource_len(pcidev, bar) - board->first_offset) >>
+		(board->reg_shift + 3);
+
+	nr_ports = board->num_ports;
+
+	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;
+	uart.port.uartclk = board->base_baud * 16;
+	uart.port.irq = pcidev->irq;
+	uart.port.dev = &pcidev->dev;
+
+	for (i = 0; i < nr_ports && i < maxnr; i++) {
+		if (board->setup(priv, pcidev, board, &uart, 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)
+{
+	int i;
+	struct exar8250 *priv = pci_get_drvdata(pcidev);
+
+	for (i = 0; i < priv->nr; i++)
+		serial8250_unregister_port(priv->line[i]);
+
+	if (priv->board->exit)
+		priv->board->exit(pcidev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int exar_suspend(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct exar8250 *priv = pci_get_drvdata(pdev);
+	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(pdev);
+
+	return 0;
+}
+
+static int exar_resume(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct exar8250 *priv = pci_get_drvdata(pdev);
+	unsigned int i;
+
+	if (priv) {
+		for (i = 0; i < priv->nr; i++)
+			if (priv->line[i] >= 0)
+				serial8250_resume_port(priv->line[i]);
+	}
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(exar_pci_pm, exar_suspend, exar_resume);
+
+static const struct exar8250_board pbn_b0_2_1843200_200 = {
+	.num_ports	= 2,
+	.base_baud	= 1843200,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup
+};
+
+static const struct exar8250_board pbn_b0_4_1843200_200 = {
+	.num_ports	= 4,
+	.base_baud	= 1843200,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup
+};
+
+static const struct exar8250_board pbn_b0_8_1843200_200 = {
+	.num_ports	= 8,
+	.base_baud	= 1843200,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup,
+};
+
+static const struct exar8250_board pbn_exar_ibm_saturn = {
+	.num_ports	= 1,
+	.base_baud	= 921600,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup,
+};
+
+static const struct exar8250_board pbn_exar_XR17C152 = {
+	.num_ports	= 2,
+	.base_baud	= 921600,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup,
+};
+
+static const struct exar8250_board pbn_exar_XR17C154 = {
+	.num_ports	= 4,
+	.base_baud	= 921600,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup,
+};
+
+static const struct exar8250_board pbn_exar_XR17C158 = {
+	.num_ports	= 8,
+	.base_baud	= 921600,
+	.uart_offset	= 0x200,
+	.setup		= pci_xr17c154_setup,
+};
+
+static const struct exar8250_board pbn_exar_XR17V352 = {
+	.num_ports	= 2,
+	.base_baud	= 7812500,
+	.uart_offset	= 0x400,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_exar_XR17V354 = {
+	.num_ports	= 4,
+	.base_baud	= 7812500,
+	.uart_offset	= 0x400,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_exar_XR17V358 = {
+	.num_ports	= 8,
+	.base_baud	= 7812500,
+	.uart_offset	= 0x400,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_exar_XR17V4358 = {
+	.num_ports	= 12,
+	.base_baud	= 7812500,
+	.uart_offset	= 0x400,
+	.has_slave	= true,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+static const struct exar8250_board pbn_exar_XR17V8358 = {
+	.num_ports	= 16,
+	.base_baud	= 7812500,
+	.uart_offset	= 0x400,
+	.has_slave	= true,
+	.setup		= pci_xr17v35x_setup,
+	.exit		= pci_xr17v35x_exit,
+};
+
+#define CONNECT_DEVICE(devid, sdevid, board) { 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)&board }
+
+#define EXAR_DEVICE(vend, devid, bd) { PCI_VDEVICE(vend,\
+		PCI_DEVICE_ID_##devid), (kernel_ulong_t)&bd }
+
+static struct pci_device_id exar_pci_tbl[] = {
+	CONNECT_DEVICE(XR17C152, UART_2_232, pbn_b0_2_1843200_200),
+	CONNECT_DEVICE(XR17C154, UART_4_232, pbn_b0_4_1843200_200),
+	CONNECT_DEVICE(XR17C158, UART_8_232, pbn_b0_8_1843200_200),
+	CONNECT_DEVICE(XR17C152, UART_1_1, pbn_b0_2_1843200_200),
+	CONNECT_DEVICE(XR17C154, UART_2_2, pbn_b0_4_1843200_200),
+	CONNECT_DEVICE(XR17C158, UART_4_4, pbn_b0_8_1843200_200),
+	CONNECT_DEVICE(XR17C152, UART_2, pbn_b0_2_1843200_200),
+	CONNECT_DEVICE(XR17C154, UART_4, pbn_b0_4_1843200_200),
+	CONNECT_DEVICE(XR17C158, UART_8, pbn_b0_8_1843200_200),
+	CONNECT_DEVICE(XR17C152, UART_2_485, pbn_b0_2_1843200_200),
+	CONNECT_DEVICE(XR17C154, UART_4_485, pbn_b0_4_1843200_200),
+	CONNECT_DEVICE(XR17C158, UART_8_485, pbn_b0_8_1843200_200),
+	{	PCI_DEVICE_SUB(PCI_VENDOR_ID_EXAR,
+		PCI_DEVICE_ID_EXAR_XR17C152,
+		PCI_VENDOR_ID_IBM,
+		PCI_SUBDEVICE_ID_IBM_SATURN_SERIAL_ONE_PORT), 0, 0,
+		(kernel_ulong_t)&pbn_exar_ibm_saturn },
+	/*
+	 * Exar Corp. XR17C15[248] Dual/Quad/Octal UART
+	 */
+	EXAR_DEVICE(EXAR, EXAR_XR17C152, pbn_exar_XR17C152),
+	EXAR_DEVICE(EXAR, EXAR_XR17C154, pbn_exar_XR17C154),
+	EXAR_DEVICE(EXAR, EXAR_XR17C158, pbn_exar_XR17C158),
+	/*
+	 * Exar Corp. XR17V[48]35[248] Dual/Quad/Octal/Hexa PCIe UARTs
+	 */
+	EXAR_DEVICE(EXAR, EXAR_XR17V352, pbn_exar_XR17V352),
+	EXAR_DEVICE(EXAR, EXAR_XR17V354, pbn_exar_XR17V354),
+	EXAR_DEVICE(EXAR, EXAR_XR17V358, pbn_exar_XR17V358),
+	EXAR_DEVICE(EXAR, EXAR_XR17V4358, pbn_exar_XR17V4358),
+	EXAR_DEVICE(EXAR, EXAR_XR17V8358, pbn_exar_XR17V8358),
+	EXAR_DEVICE(COMMTECH, COMMTECH_4222PCIE, pbn_exar_XR17V352),
+	EXAR_DEVICE(COMMTECH, COMMTECH_4224PCIE, pbn_exar_XR17V354),
+	EXAR_DEVICE(COMMTECH, COMMTECH_4228PCIE, pbn_exar_XR17V358),
+	{ 0, }
+};
+
+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_DEVICE_TABLE(pci, exar_pci_tbl);
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 0b8b674..0d20985 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -127,6 +127,11 @@ 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
+	default SERIAL_8250
+
 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
-- 
2.7.4

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