serial: max3107: Abstract out the platform specific bits

At the moment there is only one platform type supported and there is is
hard wired, but with these changes the infrastructure is now there for
anyone else to provide methods for their hardware.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 84 insertions, 329 deletions

diff --git a/drivers/serial/max3107.c b/drivers/serial/max3107.c
index a96ddd388ffd..67283c1a57ff 100644
--- a/drivers/serial/max3107.c
+++ b/drivers/serial/max3107.c
@@ -31,98 +31,12 @@
 #include <linux/device.h>
 #include <linux/serial_core.h>
 #include <linux/serial.h>
+#include <linux/gpio.h>
 #include <linux/spi/spi.h>
 #include <linux/freezer.h>
-#include <linux/platform_device.h>
-#include <linux/gpio.h>
-#include <linux/sfi.h>
-#include <asm/mrst.h>
 #include "max3107.h"
 
-struct baud_table {
-	int baud;
-	u32 new_brg;
-};
-
-struct max3107_port {
-	/* UART port structure */
-	struct uart_port port;
-
-	/* SPI device structure */
-	struct spi_device *spi;
-
-	/* GPIO chip stucture */
-	struct gpio_chip chip;
-
-	/* Workqueue that does all the magic */
-	struct workqueue_struct *workqueue;
-	struct work_struct work;
-
-	/* Lock for shared data */
-	spinlock_t data_lock;
-
-	/* Device configuration */
-	int ext_clk;		/* 1 if external clock used */
-	int loopback;		/* Current loopback mode state */
-	int baud;			/* Current baud rate */
-
-	/* State flags */
-	int suspended;		/* Indicates suspend mode */
-	int tx_fifo_empty;	/* Flag for TX FIFO state */
-	int rx_enabled;		/* Flag for receiver state */
-	int tx_enabled;		/* Flag for transmitter state */
-
-	u16 irqen_reg;		/* Current IRQ enable register value */
-	/* Shared data */
-	u16 mode1_reg;		/* Current mode1 register value*/
-	int mode1_commit;	/* Flag for setting new mode1 register value */
-	u16 lcr_reg;		/* Current LCR register value */
-	int lcr_commit;		/* Flag for setting new LCR register value */
-	u32 brg_cfg;		/* Current Baud rate generator config  */
-	int brg_commit;		/* Flag for setting new baud rate generator
-				 * config
-				 */
-	struct baud_table *baud_tbl;
-	int handle_irq;		/* Indicates that IRQ should be handled */
-
-	/* Rx buffer and str*/
-	u16 *rxbuf;
-	u8  *rxstr;
-	/* Tx buffer*/
-	u16 *txbuf;
-};
-
-/* Platform data structure */
-struct max3107_plat {
-	/* Loopback mode enable */
-	int loopback;
-	/* External clock enable */
-	int ext_clk;
-	/* HW suspend function */
-	void (*max3107_hw_suspend) (struct max3107_port *s, int suspend);
-	/* Polling mode enable */
-	int polled_mode;
-	/* Polling period if polling mode enabled */
-	int poll_time;
-};
-
-static struct baud_table brg13_ext[] = {
-	{ 300,    MAX3107_BRG13_B300 },
-	{ 600,    MAX3107_BRG13_B600 },
-	{ 1200,   MAX3107_BRG13_B1200 },
-	{ 2400,   MAX3107_BRG13_B2400 },
-	{ 4800,   MAX3107_BRG13_B4800 },
-	{ 9600,   MAX3107_BRG13_B9600 },
-	{ 19200,  MAX3107_BRG13_B19200 },
-	{ 57600,  MAX3107_BRG13_B57600 },
-	{ 115200, MAX3107_BRG13_B115200 },
-	{ 230400, MAX3107_BRG13_B230400 },
-	{ 460800, MAX3107_BRG13_B460800 },
-	{ 921600, MAX3107_BRG13_B921600 },
-	{ 0, 0 }
-};
-
-static struct baud_table brg26_ext[] = {
+static const struct baud_table brg26_ext[] = {
 	{ 300,    MAX3107_BRG26_B300 },
 	{ 600,    MAX3107_BRG26_B600 },
 	{ 1200,   MAX3107_BRG26_B1200 },
@@ -138,7 +52,7 @@ static struct baud_table brg26_ext[] = {
 	{ 0, 0 }
 };
 
-static struct baud_table brg13_int[] = {
+static const struct baud_table brg13_int[] = {
 	{ 300,    MAX3107_BRG13_IB300 },
 	{ 600,    MAX3107_BRG13_IB600 },
 	{ 1200,   MAX3107_BRG13_IB1200 },
@@ -157,7 +71,7 @@ static struct baud_table brg13_int[] = {
 static u32 get_new_brg(int baud, struct max3107_port *s)
 {
 	int i;
-	struct baud_table *baud_tbl = s->baud_tbl;
+	const struct baud_table *baud_tbl = s->baud_tbl;
 
 	for (i = 0; i < 13; i++) {
 		if (baud == baud_tbl[i].baud)
@@ -168,7 +82,7 @@ static u32 get_new_brg(int baud, struct max3107_port *s)
 }
 
 /* Perform SPI transfer for write/read of device register(s) */
-static int max3107_rw(struct max3107_port *s, u8 *tx, u8 *rx, int len)
+int max3107_rw(struct max3107_port *s, u8 *tx, u8 *rx, int len)
 {
 	struct spi_message spi_msg;
 	struct spi_transfer spi_xfer;
@@ -213,6 +127,7 @@ static int max3107_rw(struct max3107_port *s, u8 *tx, u8 *rx, int len)
 #endif
 	return 0;
 }
+EXPORT_SYMBOL_GPL(max3107_rw);
 
 /* Puts received data to circular buffer */
 static void put_data_to_circ_buf(struct max3107_port *s, unsigned char *data,
@@ -611,16 +526,10 @@ static void max3107_register_init(struct max3107_port *s)
 		s->brg_cfg = MAX3107_BRG13_IB9600;
 		s->baud_tbl = (struct baud_table *)brg13_int;
 	}
-#if 0
-	/*override for AAVA SC specific*/
-	if (mrst_platform_id() == MRST_PLATFORM_AAVA_SC) {
-		if (get_koski_build_id() <= KOSKI_EV2)
-			if (s->ext_clk) {
-				s->brg_cfg = MAX3107_BRG13_B9600;
-				s->baud_tbl = (struct baud_table *)brg13_ext;
-			}
-	}
-#endif
+
+	if (s->pdata->init)
+		s->pdata->init(s);
+
 	buf[0] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVMSB_REG)
 		| ((s->brg_cfg >> 16) & MAX3107_SPI_TX_DATA_MASK);
 	buf[1] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVLSB_REG)
@@ -734,7 +643,7 @@ static irqreturn_t max3107_irq(int irqno, void *dev_id)
  * used but that would mess the GPIOs
  *
  */
-static void max3107_hw_susp(struct max3107_port *s, int suspend)
+void max3107_hw_susp(struct max3107_port *s, int suspend)
 {
 	pr_debug("enter, suspend %d\n", suspend);
 
@@ -752,6 +661,7 @@ static void max3107_hw_susp(struct max3107_port *s, int suspend)
 		max3107_set_sleep(s, MAX3107_DISABLE_AUTOSLEEP);
 	}
 }
+EXPORT_SYMBOL_GPL(max3107_hw_susp);
 
 /* Modem status IRQ enabling */
 static void max3107_enable_ms(struct uart_port *port)
@@ -899,10 +809,8 @@ static void max3107_shutdown(struct uart_port *port)
 {
 	struct max3107_port *s = container_of(port, struct max3107_port, port);
 
-	if (s->suspended) {
-		/* Resume HW */
-		max3107_hw_susp(s, 0);
-	}
+	if (s->suspended && s->pdata->hw_suspend)
+		s->pdata->hw_suspend(s, 0);
 
 	/* Free the interrupt */
 	free_irq(s->spi->irq, s);
@@ -915,7 +823,8 @@ static void max3107_shutdown(struct uart_port *port)
 	}
 
 	/* Suspend HW */
-	max3107_hw_susp(s, 1);
+	if (s->pdata->hw_suspend)
+		s->pdata->hw_suspend(s, 1);
 }
 
 /* Port startup function */
@@ -941,7 +850,8 @@ static int max3107_startup(struct uart_port *port)
 	}
 
 	/* Resume HW */
-	max3107_hw_susp(s, 0);
+	if (s->pdata->hw_suspend)
+		s->pdata->hw_suspend(s, 0);
 
 	/* Init registers */
 	max3107_register_init(s);
@@ -973,16 +883,14 @@ static int max3107_request_port(struct uart_port *port)
 static void max3107_config_port(struct uart_port *port, int flags)
 {
 	struct max3107_port *s = container_of(port, struct max3107_port, port);
-
-	/* Use PORT_MAX3100 since we are at least int the same series */
-	s->port.type = PORT_MAX3100;
+	s->port.type = PORT_MAX3107;
 }
 
 /* Port verify function */
 static int max3107_verify_port(struct uart_port *port,
 				struct serial_struct *ser)
 {
-	if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3100)
+	if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3107)
 		return 0;
 
 	return -EINVAL;
@@ -1000,157 +908,6 @@ static void max3107_break_ctl(struct uart_port *port, int break_state)
 	/* We don't support break control, do nothing */
 }
 
-/* GPIO direction to input function */
-static int max3107_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
-{
-	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
-	u16 buf[1];		/* Buffer for SPI transfer */
-
-	if (offset >= MAX3107_GPIO_COUNT) {
-		dev_err(&s->spi->dev, "Invalid GPIO\n");
-		return -EINVAL;
-	}
-
-	/* Read current GPIO configuration register */
-	buf[0] = MAX3107_GPIOCFG_REG;
-	/* Perform SPI transfer */
-	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
-		dev_err(&s->spi->dev, "SPI transfer GPIO read failed\n");
-		return -EIO;
-	}
-	buf[0] &= MAX3107_SPI_RX_DATA_MASK;
-
-	/* Set GPIO to input */
-	buf[0] &= ~(0x0001 << offset);
-
-	/* Write new GPIO configuration register value */
-	buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);
-	/* Perform SPI transfer */
-	if (max3107_rw(s, (u8 *)buf, NULL, 2)) {
-		dev_err(&s->spi->dev, "SPI transfer GPIO write failed\n");
-		return -EIO;
-	}
-	return 0;
-}
-
-/* GPIO direction to output function */
-static int max3107_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
-					int value)
-{
-	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
-	u16 buf[2];	/* Buffer for SPI transfers */
-
-	if (offset >= MAX3107_GPIO_COUNT) {
-		dev_err(&s->spi->dev, "Invalid GPIO\n");
-		return -EINVAL;
-	}
-
-	/* Read current GPIO configuration and data registers */
-	buf[0] = MAX3107_GPIOCFG_REG;
-	buf[1] = MAX3107_GPIODATA_REG;
-	/* Perform SPI transfer */
-	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {
-		dev_err(&s->spi->dev, "SPI transfer gpio failed\n");
-		return -EIO;
-	}
-	buf[0] &= MAX3107_SPI_RX_DATA_MASK;
-	buf[1] &= MAX3107_SPI_RX_DATA_MASK;
-
-	/* Set GPIO to output */
-	buf[0] |= (0x0001 << offset);
-	/* Set value */
-	if (value)
-		buf[1] |= (0x0001 << offset);
-	else
-		buf[1] &= ~(0x0001 << offset);
-
-	/* Write new GPIO configuration and data register values */
-	buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);
-	buf[1] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);
-	/* Perform SPI transfer */
-	if (max3107_rw(s, (u8 *)buf, NULL, 4)) {
-		dev_err(&s->spi->dev,
-			"SPI transfer for GPIO conf data w failed\n");
-		return -EIO;
-	}
-	return 0;
-}
-
-/* GPIO value query function */
-static int max3107_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
-	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
-	u16 buf[1];	/* Buffer for SPI transfer */
-
-	if (offset >= MAX3107_GPIO_COUNT) {
-		dev_err(&s->spi->dev, "Invalid GPIO\n");
-		return -EINVAL;
-	}
-
-	/* Read current GPIO data register */
-	buf[0] = MAX3107_GPIODATA_REG;
-	/* Perform SPI transfer */
-	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
-		dev_err(&s->spi->dev, "SPI transfer GPIO data r failed\n");
-		return -EIO;
-	}
-	buf[0] &= MAX3107_SPI_RX_DATA_MASK;
-
-	/* Return value */
-	return buf[0] & (0x0001 << offset);
-}
-
-/* GPIO value set function */
-static void max3107_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
-	struct max3107_port *s = container_of(chip, struct max3107_port, chip);
-	u16 buf[2];	/* Buffer for SPI transfers */
-
-	if (offset >= MAX3107_GPIO_COUNT) {
-		dev_err(&s->spi->dev, "Invalid GPIO\n");
-		return;
-	}
-
-	/* Read current GPIO configuration registers*/
-	buf[0] = MAX3107_GPIODATA_REG;
-	buf[1] = MAX3107_GPIOCFG_REG;
-	/* Perform SPI transfer */
-	if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {
-		dev_err(&s->spi->dev,
-			"SPI transfer for GPIO data and config read failed\n");
-		return;
-	}
-	buf[0] &= MAX3107_SPI_RX_DATA_MASK;
-	buf[1] &= MAX3107_SPI_RX_DATA_MASK;
-
-	if (!(buf[1] & (0x0001 << offset))) {
-		/* Configured as input, can't set value */
-		dev_warn(&s->spi->dev,
-				"Trying to set value for input GPIO\n");
-		return;
-	}
-
-	/* Set value */
-	if (value)
-		buf[0] |= (0x0001 << offset);
-	else
-		buf[0] &= ~(0x0001 << offset);
-
-	/* Write new GPIO data register value */
-	buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);
-	/* Perform SPI transfer */
-	if (max3107_rw(s, (u8 *)buf, NULL, 2))
-		dev_err(&s->spi->dev, "SPI transfer GPIO data w failed\n");
-}
-
-/* Platform data */
-static struct max3107_plat max3107_plat_data = {
-	.loopback               = 0,
-	.ext_clk                = 1,
-	.max3107_hw_suspend     = &max3107_hw_susp,
-	.polled_mode            = 0,
-	.poll_time              = 0,
-};
 
 /* Port functions */
 static struct uart_ops max3107_ops = {
@@ -1180,52 +937,48 @@ static struct uart_driver max3107_uart_driver = {
 	.nr             = 1,
 };
 
-/* GPIO chip data */
-static struct gpio_chip max3107_gpio_chip = {
-	.owner			= THIS_MODULE,
-	.direction_input	= max3107_gpio_direction_in,
-	.direction_output	= max3107_gpio_direction_out,
-	.get			= max3107_gpio_get,
-	.set			= max3107_gpio_set,
-	.can_sleep		= 1,
-	.base			= MAX3107_GPIO_BASE,
-	.ngpio			= MAX3107_GPIO_COUNT,
+static int driver_registered = 0;
+
+
+
+/* 'Generic' platform data */
+static struct max3107_plat generic_plat_data = {
+	.loopback               = 0,
+	.ext_clk                = 1,
+	.hw_suspend		= max3107_hw_susp,
+	.polled_mode            = 0,
+	.poll_time              = 0,
 };
-/* Device probe function */
-static int __devinit max3107_probe(struct spi_device *spi)
+
+
+/*******************************************************************/
+
+/**
+ *	max3107_probe		-	SPI bus probe entry point
+ *	@spi: the spi device
+ *
+ *	SPI wants us to probe this device and if appropriate claim it.
+ *	Perform any platform specific requirements and then initialise
+ *	the device.
+ */
+
+int max3107_probe(struct spi_device *spi, struct max3107_plat *pdata)
 {
 	struct max3107_port *s;
-	struct max3107_plat *pdata = &max3107_plat_data;
 	u16 buf[2];	/* Buffer for SPI transfers */
 	int retval;
 
 	pr_info("enter max3107 probe\n");
 
-	/* Reset the chip */
-	if (gpio_request(MAX3107_RESET_GPIO, "max3107")) {
-		pr_err("Requesting RESET GPIO failed\n");
-		return -EIO;
-	}
-	if (gpio_direction_output(MAX3107_RESET_GPIO, 0)) {
-		pr_err("Setting RESET GPIO to 0 failed\n");
-		gpio_free(MAX3107_RESET_GPIO);
-		return -EIO;
-	}
-	msleep(MAX3107_RESET_DELAY);
-	if (gpio_direction_output(MAX3107_RESET_GPIO, 1)) {
-		pr_err("Setting RESET GPIO to 1 failed\n");
-		gpio_free(MAX3107_RESET_GPIO);
-		return -EIO;
-	}
-	gpio_free(MAX3107_RESET_GPIO);
-	msleep(MAX3107_WAKEUP_DELAY);
-
 	/* Allocate port structure */
 	s = kzalloc(sizeof(*s), GFP_KERNEL);
 	if (!s) {
 		pr_err("Allocating port structure failed\n");
 		return -ENOMEM;
 	}
+
+	s->pdata = pdata;
+
 	/* SPI Rx buffer
 	 * +2 for RX FIFO interrupt
 	 * disabling and RX level query
@@ -1298,10 +1051,13 @@ static int __devinit max3107_probe(struct spi_device *spi)
 	}
 
 	/* Register UART driver */
-	retval = uart_register_driver(&max3107_uart_driver);
-	if (retval) {
-		dev_err(&s->spi->dev, "Registering UART driver failed\n");
-		return retval;
+	if (!driver_registered) {
+		retval = uart_register_driver(&max3107_uart_driver);
+		if (retval) {
+			dev_err(&s->spi->dev, "Registering UART driver failed\n");
+			return retval;
+		}
+		driver_registered = 1;
 	}
 
 	/* Initialize UART port data */
@@ -1312,8 +1068,7 @@ static int __devinit max3107_probe(struct spi_device *spi)
 	s->port.uartclk = 9600;
 	s->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
 	s->port.irq = s->spi->irq;
-	/* Use PORT_MAX3100 since we are at least in the same series */
-	s->port.type = PORT_MAX3100;
+	s->port.type = PORT_MAX3107;
 
 	/* Add UART port */
 	retval = uart_add_one_port(&max3107_uart_driver, &s->port);
@@ -1322,44 +1077,31 @@ static int __devinit max3107_probe(struct spi_device *spi)
 		return retval;
 	}
 
-	/* Initialize GPIO chip data */
-	s->chip = max3107_gpio_chip;
-	s->chip.label = spi->modalias;
-	s->chip.dev = &spi->dev;
-
-	/* Add GPIO chip */
-	retval = gpiochip_add(&s->chip);
-	if (retval) {
-		dev_err(&s->spi->dev, "Adding GPIO chip failed\n");
-		return retval;
+	if (pdata->configure) {
+		retval = pdata->configure(s);
+		if (retval < 0)
+			return retval;
 	}
 
-	/* Temporary fix for EV2 boot problems, set modem reset to 0 */
-	max3107_gpio_direction_out(&s->chip, 3, 0);
-
 	/* Go to suspend mode */
-	max3107_hw_susp(s, 1);
+	if (pdata->hw_suspend)
+		pdata->hw_suspend(s, 1);
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(max3107_probe);
 
 /* Driver remove function */
-static int __devexit max3107_remove(struct spi_device *spi)
+int max3107_remove(struct spi_device *spi)
 {
 	struct max3107_port *s = dev_get_drvdata(&spi->dev);
 
 	pr_info("enter max3107 remove\n");
 
-	/* Remove GPIO chip */
-	if (gpiochip_remove(&s->chip))
-		dev_warn(&s->spi->dev, "Removing GPIO chip failed\n");
-
 	/* Remove port */
 	if (uart_remove_one_port(&max3107_uart_driver, &s->port))
 		dev_warn(&s->spi->dev, "Removing UART port failed\n");
 
-	/* Unregister UART driver */
-	uart_unregister_driver(&max3107_uart_driver);
 
 	/* Free TxRx buffer */
 	kfree(s->rxbuf);
@@ -1371,9 +1113,10 @@ static int __devexit max3107_remove(struct spi_device *spi)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(max3107_remove);
 
 /* Driver suspend function */
-static int max3107_suspend(struct spi_device *spi, pm_message_t state)
+int max3107_suspend(struct spi_device *spi, pm_message_t state)
 {
 #ifdef CONFIG_PM
 	struct max3107_port *s = dev_get_drvdata(&spi->dev);
@@ -1384,13 +1127,15 @@ static int max3107_suspend(struct spi_device *spi, pm_message_t state)
 	uart_suspend_port(&max3107_uart_driver, &s->port);
 
 	/* Go to suspend mode */
-	max3107_hw_susp(s, 1);
+	if (s->pdata->hw_suspend)
+		s->pdata->hw_suspend(s, 1);
 #endif	/* CONFIG_PM */
 	return 0;
 }
+EXPORT_SYMBOL_GPL(max3107_suspend);
 
 /* Driver resume function */
-static int max3107_resume(struct spi_device *spi)
+int max3107_resume(struct spi_device *spi)
 {
 #ifdef CONFIG_PM
 	struct max3107_port *s = dev_get_drvdata(&spi->dev);
@@ -1398,13 +1143,20 @@ static int max3107_resume(struct spi_device *spi)
 	pr_debug("enter resume\n");
 
 	/* Resume from suspend */
-	max3107_hw_susp(s, 0);
+	if (s->pdata->hw_suspend)
+		s->pdata->hw_suspend(s, 0);
 
 	/* Resume UART port */
 	uart_resume_port(&max3107_uart_driver, &s->port);
 #endif	/* CONFIG_PM */
 	return 0;
 }
+EXPORT_SYMBOL_GPL(max3107_resume);
+
+static int max3107_probe_generic(struct spi_device *spi)
+{
+	return max3107_probe(spi, &generic_plat_data);
+}
 
 /* Spi driver data */
 static struct spi_driver max3107_driver = {
@@ -1413,7 +1165,7 @@ static struct spi_driver max3107_driver = {
 		.bus		= &spi_bus_type,
 		.owner		= THIS_MODULE,
 	},
-	.probe		= max3107_probe,
+	.probe		= max3107_probe_generic,
 	.remove		= __devexit_p(max3107_remove),
 	.suspend	= max3107_suspend,
 	.resume		= max3107_resume,
@@ -1430,6 +1182,9 @@ static int __init max3107_init(void)
 static void __exit max3107_exit(void)
 {
 	pr_info("enter max3107 exit\n");
+	/* Unregister UART driver */
+	if (driver_registered)
+		uart_unregister_driver(&max3107_uart_driver);
 	spi_unregister_driver(&max3107_driver);
 }
 
@@ -1438,5 +1193,5 @@ module_exit(max3107_exit);
 
 MODULE_DESCRIPTION("MAX3107 driver");
 MODULE_AUTHOR("Aavamobile");
-MODULE_ALIAS("max3107-spi-uart");
-MODULE_LICENSE("GPLv2");
+MODULE_ALIAS("max3107-spi");
+MODULE_LICENSE("GPL v2");