net/irda: sh_sir: Add SuperH IrDA driver

This is very simple IrDA SIR driver for SuperH.
This driver was tested by irdaping/ircp on SH7724 EcoVec24 board

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 834 insertions, 0 deletions

diff --git a/drivers/net/irda/Kconfig b/drivers/net/irda/Kconfig
index f763842..af10e97 100644
--- a/drivers/net/irda/Kconfig
+++ b/drivers/net/irda/Kconfig
@@ -64,6 +64,16 @@ endchoice
 
 comment "Dongle support"
 
+config SH_SIR
+	tristate "SuperH SIR on UART"
+	depends on IRDA && SUPERH && \
+		(CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7723 || \
+		 CPU_SUBTYPE_SH7724)
+	default n
+	help
+	  Say Y here if your want to enable SIR function on SuperH UART
+	  devices.
+
 config DONGLE
 	bool "Serial dongle support"
 	depends on IRTTY_SIR
diff --git a/drivers/net/irda/Makefile b/drivers/net/irda/Makefile
index d82e1e3..e030d47 100644
--- a/drivers/net/irda/Makefile
+++ b/drivers/net/irda/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_AU1000_FIR)	+= au1k_ir.o
 # SIR drivers
 obj-$(CONFIG_IRTTY_SIR)		+= irtty-sir.o	sir-dev.o
 obj-$(CONFIG_BFIN_SIR)		+= bfin_sir.o
+obj-$(CONFIG_SH_SIR)		+= sh_sir.o
 # dongle drivers for SIR drivers
 obj-$(CONFIG_ESI_DONGLE)	+= esi-sir.o
 obj-$(CONFIG_TEKRAM_DONGLE)	+= tekram-sir.o
diff --git a/drivers/net/irda/sh_sir.c b/drivers/net/irda/sh_sir.c
new file mode 100644
index 0000000..d7c983d
--- /dev/null
+++ b/drivers/net/irda/sh_sir.c
@@ -0,0 +1,823 @@
+/*
+ * SuperH IrDA Driver
+ *
+ * Copyright (C) 2009 Renesas Solutions Corp.
+ * Kuninori Morimoto <morimoto.kuninori@renesas.com>
+ *
+ * Based on bfin_sir.c
+ * Copyright 2006-2009 Analog Devices Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/irda_device.h>
+#include <asm/clock.h>
+
+#define DRIVER_NAME "sh_sir"
+
+#define RX_PHASE	(1 << 0)
+#define TX_PHASE	(1 << 1)
+#define TX_COMP_PHASE	(1 << 2) /* tx complete */
+#define NONE_PHASE	(1 << 31)
+
+#define IRIF_RINTCLR	0x0016 /* DMA rx interrupt source clear */
+#define IRIF_TINTCLR	0x0018 /* DMA tx interrupt source clear */
+#define IRIF_SIR0	0x0020 /* IrDA-SIR10 control */
+#define IRIF_SIR1	0x0022 /* IrDA-SIR10 baudrate error correction */
+#define IRIF_SIR2	0x0024 /* IrDA-SIR10 baudrate count */
+#define IRIF_SIR3	0x0026 /* IrDA-SIR10 status */
+#define IRIF_SIR_FRM	0x0028 /* Hardware frame processing set */
+#define IRIF_SIR_EOF	0x002A /* EOF value */
+#define IRIF_SIR_FLG	0x002C /* Flag clear */
+#define IRIF_UART_STS2	0x002E /* UART status 2 */
+#define IRIF_UART0	0x0030 /* UART control */
+#define IRIF_UART1	0x0032 /* UART status */
+#define IRIF_UART2	0x0034 /* UART mode */
+#define IRIF_UART3	0x0036 /* UART transmit data */
+#define IRIF_UART4	0x0038 /* UART receive data */
+#define IRIF_UART5	0x003A /* UART interrupt mask */
+#define IRIF_UART6	0x003C /* UART baud rate error correction */
+#define IRIF_UART7	0x003E /* UART baud rate count set */
+#define IRIF_CRC0	0x0040 /* CRC engine control */
+#define IRIF_CRC1	0x0042 /* CRC engine input data */
+#define IRIF_CRC2	0x0044 /* CRC engine calculation */
+#define IRIF_CRC3	0x0046 /* CRC engine output data 1 */
+#define IRIF_CRC4	0x0048 /* CRC engine output data 2 */
+
+/* IRIF_SIR0 */
+#define IRTPW		(1 << 1) /* transmit pulse width select */
+#define IRERRC		(1 << 0) /* Clear receive pulse width error */
+
+/* IRIF_SIR3 */
+#define IRERR		(1 << 0) /* received pulse width Error */
+
+/* IRIF_SIR_FRM */
+#define EOFD		(1 << 9) /* EOF detection flag */
+#define FRER		(1 << 8) /* Frame Error bit */
+#define FRP		(1 << 0) /* Frame processing set */
+
+/* IRIF_UART_STS2 */
+#define IRSME		(1 << 6) /* Receive Sum     Error flag */
+#define IROVE		(1 << 5) /* Receive Overrun Error flag */
+#define IRFRE		(1 << 4) /* Receive Framing Error flag */
+#define IRPRE		(1 << 3) /* Receive Parity  Error flag */
+
+/* IRIF_UART0_*/
+#define TBEC		(1 << 2) /* Transmit Data Clear */
+#define RIE		(1 << 1) /* Receive Enable */
+#define TIE		(1 << 0) /* Transmit Enable */
+
+/* IRIF_UART1 */
+#define URSME		(1 << 6) /* Receive Sum Error Flag */
+#define UROVE		(1 << 5) /* Receive Overrun Error Flag */
+#define URFRE		(1 << 4) /* Receive Framing Error Flag */
+#define URPRE		(1 << 3) /* Receive Parity Error Flag */
+#define RBF		(1 << 2) /* Receive Buffer Full Flag */
+#define TSBE		(1 << 1) /* Transmit Shift Buffer Empty Flag */
+#define TBE		(1 << 0) /* Transmit Buffer Empty flag */
+#define TBCOMP		(TSBE | TBE)
+
+/* IRIF_UART5 */
+#define RSEIM		(1 << 6) /* Receive Sum Error Flag IRQ Mask */
+#define RBFIM		(1 << 2) /* Receive Buffer Full Flag IRQ Mask */
+#define TSBEIM		(1 << 1) /* Transmit Shift Buffer Empty Flag IRQ Mask */
+#define TBEIM		(1 << 0) /* Transmit Buffer Empty Flag IRQ Mask */
+#define RX_MASK		(RSEIM  | RBFIM)
+
+/* IRIF_CRC0 */
+#define CRC_RST		(1 << 15) /* CRC Engine Reset */
+#define CRC_CT_MASK	0x0FFF
+
+/************************************************************************
+
+
+			structure
+
+
+************************************************************************/
+struct sh_sir_self {
+	void __iomem		*membase;
+	unsigned int		 irq;
+	struct clk		*clk;
+
+	struct net_device	*ndev;
+
+	struct irlap_cb		*irlap;
+	struct qos_info		qos;
+
+	iobuff_t		tx_buff;
+	iobuff_t		rx_buff;
+};
+
+/************************************************************************
+
+
+			common function
+
+
+************************************************************************/
+static void sh_sir_write(struct sh_sir_self *self, u32 offset, u16 data)
+{
+	iowrite16(data, self->membase + offset);
+}
+
+static u16 sh_sir_read(struct sh_sir_self *self, u32 offset)
+{
+	return ioread16(self->membase + offset);
+}
+
+static void sh_sir_update_bits(struct sh_sir_self *self, u32 offset,
+			       u16 mask, u16 data)
+{
+	u16 old, new;
+
+	old = sh_sir_read(self, offset);
+	new = (old & ~mask) | data;
+	if (old != new)
+		sh_sir_write(self, offset, new);
+}
+
+/************************************************************************
+
+
+			CRC function
+
+
+************************************************************************/
+static void sh_sir_crc_reset(struct sh_sir_self *self)
+{
+	sh_sir_write(self, IRIF_CRC0, CRC_RST);
+}
+
+static void sh_sir_crc_add(struct sh_sir_self *self, u8 data)
+{
+	sh_sir_write(self, IRIF_CRC1, (u16)data);
+}
+
+static u16 sh_sir_crc_cnt(struct sh_sir_self *self)
+{
+	return CRC_CT_MASK & sh_sir_read(self, IRIF_CRC0);
+}
+
+static u16 sh_sir_crc_out(struct sh_sir_self *self)
+{
+	return sh_sir_read(self, IRIF_CRC4);
+}
+
+static int sh_sir_crc_init(struct sh_sir_self *self)
+{
+	struct device *dev = &self->ndev->dev;
+	int ret = -EIO;
+	u16 val;
+
+	sh_sir_crc_reset(self);
+
+	sh_sir_crc_add(self, 0xCC);
+	sh_sir_crc_add(self, 0xF5);
+	sh_sir_crc_add(self, 0xF1);
+	sh_sir_crc_add(self, 0xA7);
+
+	val = sh_sir_crc_cnt(self);
+	if (4 != val) {
+		dev_err(dev, "CRC count error %x\n", val);
+		goto crc_init_out;
+	}
+
+	val = sh_sir_crc_out(self);
+	if (0x51DF != val) {
+		dev_err(dev, "CRC result error%x\n", val);
+		goto crc_init_out;
+	}
+
+	ret = 0;
+
+crc_init_out:
+
+	sh_sir_crc_reset(self);
+	return ret;
+}
+
+/************************************************************************
+
+
+			baud rate functions
+
+
+************************************************************************/
+#define SCLK_BASE 1843200 /* 1.8432MHz */
+
+static u32 sh_sir_find_sclk(struct clk *irda_clk)
+{
+	struct cpufreq_frequency_table *freq_table = irda_clk->freq_table;
+	struct clk *pclk = clk_get(NULL, "peripheral_clk");
+	u32 limit, min = 0xffffffff, tmp;
+	int i, index = 0;
+
+	limit = clk_get_rate(pclk);
+	clk_put(pclk);
+
+	/* IrDA can not set over peripheral_clk */
+	for (i = 0;
+	     freq_table[i].frequency != CPUFREQ_TABLE_END;
+	     i++) {
+		u32 freq = freq_table[i].frequency;
+
+		if (freq == CPUFREQ_ENTRY_INVALID)
+			continue;
+
+		/* IrDA should not over peripheral_clk */
+		if (freq > limit)
+			continue;
+
+		tmp = freq % SCLK_BASE;
+		if (tmp < min) {
+			min = tmp;
+			index = i;
+		}
+	}
+
+	return freq_table[index].frequency;
+}
+
+#define ERR_ROUNDING(a) ((a + 5000) / 10000)
+static int sh_sir_set_baudrate(struct sh_sir_self *self, u32 baudrate)
+{
+	struct clk *clk;
+	struct device *dev = &self->ndev->dev;
+	u32 rate;
+	u16 uabca, uabc;
+	u16 irbca, irbc;
+	u32 min, rerr, tmp;
+	int i;
+
+	/* Baud Rate Error Correction x 10000 */
+	u32 rate_err_array[] = {
+		0000, 0625, 1250, 1875,
+		2500, 3125, 3750, 4375,
+		5000, 5625, 6250, 6875,
+		7500, 8125, 8750, 9375,
+	};
+
+	/*
+	 * FIXME
+	 *
+	 * it support 9600 only now
+	 */
+	switch (baudrate) {
+	case 9600:
+		break;
+	default:
+		dev_err(dev, "un-supported baudrate %d\n", baudrate);
+		return -EIO;
+	}
+
+	clk = clk_get(NULL, "irda_clk");
+	if (!clk) {
+		dev_err(dev, "can not get irda_clk\n");
+		return -EIO;
+	}
+
+	clk_set_rate(clk, sh_sir_find_sclk(clk));
+	rate = clk_get_rate(clk);
+	clk_put(clk);
+
+	dev_dbg(dev, "selected sclk = %d\n", rate);
+
+	/*
+	 * CALCULATION
+	 *
+	 * 1843200 = system rate / (irbca + (irbc + 1))
+	 */
+
+	irbc = rate / SCLK_BASE;
+
+	tmp = rate - (SCLK_BASE * irbc);
+	tmp *= 10000;
+
+	rerr = tmp / SCLK_BASE;
+
+	min = 0xffffffff;
+	irbca = 0;
+	for (i = 0; i < ARRAY_SIZE(rate_err_array); i++) {
+		tmp = abs(rate_err_array[i] - rerr);
+		if (min > tmp) {
+			min = tmp;
+			irbca = i;
+		}
+	}
+
+	tmp = rate / (irbc + ERR_ROUNDING(rate_err_array[irbca]));
+	if ((SCLK_BASE / 100) < abs(tmp - SCLK_BASE))
+		dev_warn(dev, "IrDA freq error margin over %d\n", tmp);
+
+	dev_dbg(dev, "target = %d, result = %d, infrared = %d.%d\n",
+	       SCLK_BASE, tmp, irbc, rate_err_array[irbca]);
+
+	irbca = (irbca & 0xF) << 4;
+	irbc  = (irbc - 1) & 0xF;
+
+	if (!irbc) {
+		dev_err(dev, "sh_sir can not set 0 in IRIF_SIR2\n");
+		return -EIO;
+	}
+
+	sh_sir_write(self, IRIF_SIR0, IRTPW | IRERRC);
+	sh_sir_write(self, IRIF_SIR1, irbca);
+	sh_sir_write(self, IRIF_SIR2, irbc);
+
+	/*
+	 * CALCULATION
+	 *
+	 * BaudRate[bps] = system rate / (uabca + (uabc + 1) x 16)
+	 */
+
+	uabc = rate / baudrate;
+	uabc = (uabc / 16) - 1;
+	uabc = (uabc + 1) * 16;
+
+	tmp = rate - (uabc * baudrate);
+	tmp *= 10000;
+
+	rerr = tmp / baudrate;
+
+	min = 0xffffffff;
+	uabca = 0;
+	for (i = 0; i < ARRAY_SIZE(rate_err_array); i++) {
+		tmp = abs(rate_err_array[i] - rerr);
+		if (min > tmp) {
+			min = tmp;
+			uabca = i;
+		}
+	}
+
+	tmp = rate / (uabc + ERR_ROUNDING(rate_err_array[uabca]));
+	if ((baudrate / 100) < abs(tmp - baudrate))
+		dev_warn(dev, "UART freq error margin over %d\n", tmp);
+
+	dev_dbg(dev, "target = %d, result = %d, uart = %d.%d\n",
+	       baudrate, tmp,
+	       uabc, rate_err_array[uabca]);
+
+	uabca = (uabca & 0xF) << 4;
+	uabc  = (uabc / 16) - 1;
+
+	sh_sir_write(self, IRIF_UART6, uabca);
+	sh_sir_write(self, IRIF_UART7, uabc);
+
+	return 0;
+}
+
+/************************************************************************
+
+
+			iobuf function
+
+
+************************************************************************/
+static int __sh_sir_init_iobuf(iobuff_t *io, int size)
+{
+	io->head = kmalloc(size, GFP_KERNEL);
+	if (!io->head)
+		return -ENOMEM;
+
+	io->truesize	= size;
+	io->in_frame	= FALSE;
+	io->state	= OUTSIDE_FRAME;
+	io->data	= io->head;
+
+	return 0;
+}
+
+static void sh_sir_remove_iobuf(struct sh_sir_self *self)
+{
+	kfree(self->rx_buff.head);
+	kfree(self->tx_buff.head);
+
+	self->rx_buff.head = NULL;
+	self->tx_buff.head = NULL;
+}
+
+static int sh_sir_init_iobuf(struct sh_sir_self *self, int rxsize, int txsize)
+{
+	int err = -ENOMEM;
+
+	if (self->rx_buff.head ||
+	    self->tx_buff.head) {
+		dev_err(&self->ndev->dev, "iobuff has already existed.");
+		return err;
+	}
+
+	err = __sh_sir_init_iobuf(&self->rx_buff, rxsize);
+	if (err)
+		goto iobuf_err;
+
+	err = __sh_sir_init_iobuf(&self->tx_buff, txsize);
+
+iobuf_err:
+	if (err)
+		sh_sir_remove_iobuf(self);
+
+	return err;
+}
+
+/************************************************************************
+
+
+			status function
+
+
+************************************************************************/
+static void sh_sir_clear_all_err(struct sh_sir_self *self)
+{
+	/* Clear error flag for receive pulse width */
+	sh_sir_update_bits(self, IRIF_SIR0, IRERRC, IRERRC);
+
+	/* Clear frame / EOF error flag */
+	sh_sir_write(self, IRIF_SIR_FLG, 0xffff);
+
+	/* Clear all status error */
+	sh_sir_write(self, IRIF_UART_STS2, 0);
+}
+
+static void sh_sir_set_phase(struct sh_sir_self *self, int phase)
+{
+	u16 uart5 = 0;
+	u16 uart0 = 0;
+
+	switch (phase) {
+	case TX_PHASE:
+		uart5 = TBEIM;
+		uart0 = TBEC | TIE;
+		break;
+	case TX_COMP_PHASE:
+		uart5 = TSBEIM;
+		uart0 = TIE;
+		break;
+	case RX_PHASE:
+		uart5 = RX_MASK;
+		uart0 = RIE;
+		break;
+	default:
+		break;
+	}
+
+	sh_sir_write(self, IRIF_UART5, uart5);
+	sh_sir_write(self, IRIF_UART0, uart0);
+}
+
+static int sh_sir_is_which_phase(struct sh_sir_self *self)
+{
+	u16 val = sh_sir_read(self, IRIF_UART5);
+
+	if (val & TBEIM)
+		return TX_PHASE;
+
+	if (val & TSBEIM)
+		return TX_COMP_PHASE;
+
+	if (val & RX_MASK)
+		return RX_PHASE;
+
+	return NONE_PHASE;
+}
+
+static void sh_sir_tx(struct sh_sir_self *self, int phase)
+{
+	switch (phase) {
+	case TX_PHASE:
+		if (0 >= self->tx_buff.len) {
+			sh_sir_set_phase(self, TX_COMP_PHASE);
+		} else {
+			sh_sir_write(self, IRIF_UART3, self->tx_buff.data[0]);
+			self->tx_buff.len--;
+			self->tx_buff.data++;
+		}
+		break;
+	case TX_COMP_PHASE:
+		sh_sir_set_phase(self, RX_PHASE);
+		netif_wake_queue(self->ndev);
+		break;
+	default:
+		dev_err(&self->ndev->dev, "should not happen\n");
+		break;
+	}
+}
+
+static int sh_sir_read_data(struct sh_sir_self *self)
+{
+	u16 val;
+	int timeout = 1024;
+
+	while (timeout--) {
+		val = sh_sir_read(self, IRIF_UART1);
+
+		/* data get */
+		if (val & RBF) {
+			if (val & (URSME | UROVE | URFRE | URPRE))
+				break;
+
+			return (int)sh_sir_read(self, IRIF_UART4);
+		}
+
+		udelay(1);
+	}
+
+	dev_err(&self->ndev->dev, "UART1 %04x : STATUS %04x\n",
+		val, sh_sir_read(self, IRIF_UART_STS2));
+
+	/* read data register for clear error */
+	sh_sir_read(self, IRIF_UART4);
+
+	return -1;
+}
+
+static void sh_sir_rx(struct sh_sir_self *self)
+{
+	int timeout = 1024;
+	int data;
+
+	while (timeout--) {
+		data = sh_sir_read_data(self);
+		if (data < 0)
+			break;
+
+		async_unwrap_char(self->ndev, &self->ndev->stats,
+				  &self->rx_buff, (u8)data);
+		self->ndev->last_rx = jiffies;
+
+		if (EOFD & sh_sir_read(self, IRIF_SIR_FRM))
+			continue;
+
+		break;
+	}
+}
+
+static irqreturn_t sh_sir_irq(int irq, void *dev_id)
+{
+	struct sh_sir_self *self = dev_id;
+	struct device *dev = &self->ndev->dev;
+	int phase = sh_sir_is_which_phase(self);
+
+	switch (phase) {
+	case TX_COMP_PHASE:
+	case TX_PHASE:
+		sh_sir_tx(self, phase);
+		break;
+	case RX_PHASE:
+		if (sh_sir_read(self, IRIF_SIR3))
+			dev_err(dev, "rcv pulse width error occurred\n");
+
+		sh_sir_rx(self);
+		sh_sir_clear_all_err(self);
+		break;
+	default:
+		dev_err(dev, "unknown interrupt\n");
+	}
+
+	 return IRQ_HANDLED;
+}
+
+/************************************************************************
+
+
+			net_device_ops function
+
+
+************************************************************************/
+static int sh_sir_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+	struct sh_sir_self *self = netdev_priv(ndev);
+	int speed = irda_get_next_speed(skb);
+
+	if ((0 < speed) &&
+	    (9600 != speed)) {
+		dev_err(&ndev->dev, "support 9600 only (%d)\n", speed);
+		return -EIO;
+	}
+
+	netif_stop_queue(ndev);
+
+	self->tx_buff.data = self->tx_buff.head;
+	self->tx_buff.len = 0;
+	if (skb->len)
+		self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
+						   self->tx_buff.truesize);
+
+	sh_sir_set_phase(self, TX_PHASE);
+	dev_kfree_skb(skb);
+
+	return 0;
+}
+
+static int sh_sir_ioctl(struct net_device *ndev, struct ifreq *ifreq, int cmd)
+{
+	/*
+	 * FIXME
+	 *
+	 * This function is needed for irda framework.
+	 * But nothing to do now
+	 */
+	return 0;
+}
+
+static struct net_device_stats *sh_sir_stats(struct net_device *ndev)
+{
+	struct sh_sir_self *self = netdev_priv(ndev);
+
+	return &self->ndev->stats;
+}
+
+static int sh_sir_open(struct net_device *ndev)
+{
+	struct sh_sir_self *self = netdev_priv(ndev);
+	int err;
+
+	clk_enable(self->clk);
+	err = sh_sir_crc_init(self);
+	if (err)
+		goto open_err;
+
+	sh_sir_set_baudrate(self, 9600);
+
+	self->irlap = irlap_open(ndev, &self->qos, DRIVER_NAME);
+	if (!self->irlap)
+		goto open_err;
+
+	/*
+	 * Now enable the interrupt then start the queue
+	 */
+	sh_sir_update_bits(self, IRIF_SIR_FRM, FRP, FRP);
+	sh_sir_read(self, IRIF_UART1); /* flag clear */
+	sh_sir_read(self, IRIF_UART4); /* flag clear */
+	sh_sir_set_phase(self, RX_PHASE);
+
+	netif_start_queue(ndev);
+
+	dev_info(&self->ndev->dev, "opened\n");
+
+	return 0;
+
+open_err:
+	clk_disable(self->clk);
+
+	return err;
+}
+
+static int sh_sir_stop(struct net_device *ndev)
+{
+	struct sh_sir_self *self = netdev_priv(ndev);
+
+	/* Stop IrLAP */
+	if (self->irlap) {
+		irlap_close(self->irlap);
+		self->irlap = NULL;
+	}
+
+	netif_stop_queue(ndev);
+
+	dev_info(&ndev->dev, "stoped\n");
+
+	return 0;
+}
+
+static const struct net_device_ops sh_sir_ndo = {
+	.ndo_open		= sh_sir_open,
+	.ndo_stop		= sh_sir_stop,
+	.ndo_start_xmit		= sh_sir_hard_xmit,
+	.ndo_do_ioctl		= sh_sir_ioctl,
+	.ndo_get_stats		= sh_sir_stats,
+};
+
+/************************************************************************
+
+
+			platform_driver function
+
+
+************************************************************************/
+static int __devinit sh_sir_probe(struct platform_device *pdev)
+{
+	struct net_device *ndev;
+	struct sh_sir_self *self;
+	struct resource *res;
+	char clk_name[8];
+	void __iomem *base;
+	unsigned int irq;
+	int err = -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	irq = platform_get_irq(pdev, 0);
+	if (!res || irq < 0) {
+		dev_err(&pdev->dev, "Not enough platform resources.\n");
+		goto exit;
+	}
+
+	ndev = alloc_irdadev(sizeof(*self));
+	if (!ndev)
+		goto exit;
+
+	base = ioremap_nocache(res->start, resource_size(res));
+	if (!base) {
+		err = -ENXIO;
+		dev_err(&pdev->dev, "Unable to ioremap.\n");
+		goto err_mem_1;
+	}
+
+	self = netdev_priv(ndev);
+	err = sh_sir_init_iobuf(self, IRDA_SKB_MAX_MTU, IRDA_SIR_MAX_FRAME);
+	if (err)
+		goto err_mem_2;
+
+	snprintf(clk_name, sizeof(clk_name), "irda%d", pdev->id);
+	self->clk = clk_get(&pdev->dev, clk_name);
+	if (IS_ERR(self->clk)) {
+		dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
+		goto err_mem_3;
+	}
+
+	irda_init_max_qos_capabilies(&self->qos);
+
+	ndev->netdev_ops	= &sh_sir_ndo;
+	ndev->irq		= irq;
+
+	self->membase			= base;
+	self->ndev			= ndev;
+	self->qos.baud_rate.bits	&= IR_9600; /* FIXME */
+	self->qos.min_turn_time.bits	= 1; /* 10 ms or more */
+
+	irda_qos_bits_to_value(&self->qos);
+
+	err = register_netdev(ndev);
+	if (err)
+		goto err_mem_4;
+
+	platform_set_drvdata(pdev, ndev);
+
+	if (request_irq(irq, sh_sir_irq, IRQF_DISABLED, "sh_sir", self)) {
+		dev_warn(&pdev->dev, "Unable to attach sh_sir interrupt\n");
+		goto err_mem_4;
+	}
+
+	dev_info(&pdev->dev, "SuperH IrDA probed\n");
+
+	goto exit;
+
+err_mem_4:
+	clk_put(self->clk);
+err_mem_3:
+	sh_sir_remove_iobuf(self);
+err_mem_2:
+	iounmap(self->membase);
+err_mem_1:
+	free_netdev(ndev);
+exit:
+	return err;
+}
+
+static int __devexit sh_sir_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct sh_sir_self *self = netdev_priv(ndev);
+
+	if (!self)
+		return 0;
+
+	unregister_netdev(ndev);
+	clk_put(self->clk);
+	sh_sir_remove_iobuf(self);
+	iounmap(self->membase);
+	free_netdev(ndev);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct platform_driver sh_sir_driver = {
+	.probe   = sh_sir_probe,
+	.remove  = __devexit_p(sh_sir_remove),
+	.driver  = {
+		.name = DRIVER_NAME,
+	},
+};
+
+static int __init sh_sir_init(void)
+{
+	return platform_driver_register(&sh_sir_driver);
+}
+
+static void __exit sh_sir_exit(void)
+{
+	platform_driver_unregister(&sh_sir_driver);
+}
+
+module_init(sh_sir_init);
+module_exit(sh_sir_exit);
+
+MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>");
+MODULE_DESCRIPTION("SuperH IrDA driver");
+MODULE_LICENSE("GPL");