diff options
Diffstat (limited to 'drivers/net/irda/sa1100_ir.c')
| -rw-r--r-- | drivers/net/irda/sa1100_ir.c | 1045 |
1 files changed, 1045 insertions, 0 deletions
diff --git a/drivers/net/irda/sa1100_ir.c b/drivers/net/irda/sa1100_ir.c new file mode 100644 index 00000000000..89f5096cab7 --- /dev/null +++ b/drivers/net/irda/sa1100_ir.c @@ -0,0 +1,1045 @@ +/* + * linux/drivers/net/irda/sa1100_ir.c + * + * Copyright (C) 2000-2001 Russell King + * + * 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. + * + * Infra-red driver for the StrongARM SA1100 embedded microprocessor + * + * Note that we don't have to worry about the SA1111's DMA bugs in here, + * so we use the straight forward dma_map_* functions with a null pointer. + * + * This driver takes one kernel command line parameter, sa1100ir=, with + * the following options: + * max_rate:baudrate - set the maximum baud rate + * power_leve:level - set the transmitter power level + * tx_lpm:0|1 - set transmit low power mode + */ +#include <linux/config.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/netdevice.h> +#include <linux/slab.h> +#include <linux/rtnetlink.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> + +#include <net/irda/irda.h> +#include <net/irda/wrapper.h> +#include <net/irda/irda_device.h> + +#include <asm/irq.h> +#include <asm/dma.h> +#include <asm/hardware.h> +#include <asm/mach/irda.h> + +static int power_level = 3; +static int tx_lpm; +static int max_rate = 4000000; + +struct sa1100_irda { + unsigned char hscr0; + unsigned char utcr4; + unsigned char power; + unsigned char open; + + int speed; + int newspeed; + + struct sk_buff *txskb; + struct sk_buff *rxskb; + dma_addr_t txbuf_dma; + dma_addr_t rxbuf_dma; + dma_regs_t *txdma; + dma_regs_t *rxdma; + + struct net_device_stats stats; + struct device *dev; + struct irda_platform_data *pdata; + struct irlap_cb *irlap; + struct qos_info qos; + + iobuff_t tx_buff; + iobuff_t rx_buff; +}; + +#define IS_FIR(si) ((si)->speed >= 4000000) + +#define HPSIR_MAX_RXLEN 2047 + +/* + * Allocate and map the receive buffer, unless it is already allocated. + */ +static int sa1100_irda_rx_alloc(struct sa1100_irda *si) +{ + if (si->rxskb) + return 0; + + si->rxskb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC); + + if (!si->rxskb) { + printk(KERN_ERR "sa1100_ir: out of memory for RX SKB\n"); + return -ENOMEM; + } + + /* + * Align any IP headers that may be contained + * within the frame. + */ + skb_reserve(si->rxskb, 1); + + si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data, + HPSIR_MAX_RXLEN, + DMA_FROM_DEVICE); + return 0; +} + +/* + * We want to get here as soon as possible, and get the receiver setup. + * We use the existing buffer. + */ +static void sa1100_irda_rx_dma_start(struct sa1100_irda *si) +{ + if (!si->rxskb) { + printk(KERN_ERR "sa1100_ir: rx buffer went missing\n"); + return; + } + + /* + * First empty receive FIFO + */ + Ser2HSCR0 = si->hscr0 | HSCR0_HSSP; + + /* + * Enable the DMA, receiver and receive interrupt. + */ + sa1100_clear_dma(si->rxdma); + sa1100_start_dma(si->rxdma, si->rxbuf_dma, HPSIR_MAX_RXLEN); + Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_RXE; +} + +/* + * Set the IrDA communications speed. + */ +static int sa1100_irda_set_speed(struct sa1100_irda *si, int speed) +{ + unsigned long flags; + int brd, ret = -EINVAL; + + switch (speed) { + case 9600: case 19200: case 38400: + case 57600: case 115200: + brd = 3686400 / (16 * speed) - 1; + + /* + * Stop the receive DMA. + */ + if (IS_FIR(si)) + sa1100_stop_dma(si->rxdma); + + local_irq_save(flags); + + Ser2UTCR3 = 0; + Ser2HSCR0 = HSCR0_UART; + + Ser2UTCR1 = brd >> 8; + Ser2UTCR2 = brd; + + /* + * Clear status register + */ + Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID; + Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE; + + if (si->pdata->set_speed) + si->pdata->set_speed(si->dev, speed); + + si->speed = speed; + + local_irq_restore(flags); + ret = 0; + break; + + case 4000000: + local_irq_save(flags); + + si->hscr0 = 0; + + Ser2HSSR0 = 0xff; + Ser2HSCR0 = si->hscr0 | HSCR0_HSSP; + Ser2UTCR3 = 0; + + si->speed = speed; + + if (si->pdata->set_speed) + si->pdata->set_speed(si->dev, speed); + + sa1100_irda_rx_alloc(si); + sa1100_irda_rx_dma_start(si); + + local_irq_restore(flags); + + break; + + default: + break; + } + + return ret; +} + +/* + * Control the power state of the IrDA transmitter. + * State: + * 0 - off + * 1 - short range, lowest power + * 2 - medium range, medium power + * 3 - maximum range, high power + * + * Currently, only assabet is known to support this. + */ +static int +__sa1100_irda_set_power(struct sa1100_irda *si, unsigned int state) +{ + int ret = 0; + if (si->pdata->set_power) + ret = si->pdata->set_power(si->dev, state); + return ret; +} + +static inline int +sa1100_set_power(struct sa1100_irda *si, unsigned int state) +{ + int ret; + + ret = __sa1100_irda_set_power(si, state); + if (ret == 0) + si->power = state; + + return ret; +} + +static int sa1100_irda_startup(struct sa1100_irda *si) +{ + int ret; + + /* + * Ensure that the ports for this device are setup correctly. + */ + if (si->pdata->startup) + si->pdata->startup(si->dev); + + /* + * Configure PPC for IRDA - we want to drive TXD2 low. + * We also want to drive this pin low during sleep. + */ + PPSR &= ~PPC_TXD2; + PSDR &= ~PPC_TXD2; + PPDR |= PPC_TXD2; + + /* + * Enable HP-SIR modulation, and ensure that the port is disabled. + */ + Ser2UTCR3 = 0; + Ser2HSCR0 = HSCR0_UART; + Ser2UTCR4 = si->utcr4; + Ser2UTCR0 = UTCR0_8BitData; + Ser2HSCR2 = HSCR2_TrDataH | HSCR2_RcDataL; + + /* + * Clear status register + */ + Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID; + + ret = sa1100_irda_set_speed(si, si->speed = 9600); + if (ret) { + Ser2UTCR3 = 0; + Ser2HSCR0 = 0; + + if (si->pdata->shutdown) + si->pdata->shutdown(si->dev); + } + + return ret; +} + +static void sa1100_irda_shutdown(struct sa1100_irda *si) +{ + /* + * Stop all DMA activity. + */ + sa1100_stop_dma(si->rxdma); + sa1100_stop_dma(si->txdma); + + /* Disable the port. */ + Ser2UTCR3 = 0; + Ser2HSCR0 = 0; + + if (si->pdata->shutdown) + si->pdata->shutdown(si->dev); +} + +#ifdef CONFIG_PM +/* + * Suspend the IrDA interface. + */ +static int sa1100_irda_suspend(struct device *_dev, u32 state, u32 level) +{ + struct net_device *dev = dev_get_drvdata(_dev); + struct sa1100_irda *si; + + if (!dev || level != SUSPEND_DISABLE) + return 0; + + si = dev->priv; + if (si->open) { + /* + * Stop the transmit queue + */ + netif_device_detach(dev); + disable_irq(dev->irq); + sa1100_irda_shutdown(si); + __sa1100_irda_set_power(si, 0); + } + + return 0; +} + +/* + * Resume the IrDA interface. + */ +static int sa1100_irda_resume(struct device *_dev, u32 level) +{ + struct net_device *dev = dev_get_drvdata(_dev); + struct sa1100_irda *si; + + if (!dev || level != RESUME_ENABLE) + return 0; + + si = dev->priv; + if (si->open) { + /* + * If we missed a speed change, initialise at the new speed + * directly. It is debatable whether this is actually + * required, but in the interests of continuing from where + * we left off it is desireable. The converse argument is + * that we should re-negotiate at 9600 baud again. + */ + if (si->newspeed) { + si->speed = si->newspeed; + si->newspeed = 0; + } + + sa1100_irda_startup(si); + __sa1100_irda_set_power(si, si->power); + enable_irq(dev->irq); + + /* + * This automatically wakes up the queue + */ + netif_device_attach(dev); + } + + return 0; +} +#else +#define sa1100_irda_suspend NULL +#define sa1100_irda_resume NULL +#endif + +/* + * HP-SIR format interrupt service routines. + */ +static void sa1100_irda_hpsir_irq(struct net_device *dev) +{ + struct sa1100_irda *si = dev->priv; + int status; + + status = Ser2UTSR0; + + /* + * Deal with any receive errors first. The bytes in error may be + * the only bytes in the receive FIFO, so we do this first. + */ + while (status & UTSR0_EIF) { + int stat, data; + + stat = Ser2UTSR1; + data = Ser2UTDR; + + if (stat & (UTSR1_FRE | UTSR1_ROR)) { + si->stats.rx_errors++; + if (stat & UTSR1_FRE) + si->stats.rx_frame_errors++; + if (stat & UTSR1_ROR) + si->stats.rx_fifo_errors++; + } else + async_unwrap_char(dev, &si->stats, &si->rx_buff, data); + + status = Ser2UTSR0; + } + + /* + * We must clear certain bits. + */ + Ser2UTSR0 = status & (UTSR0_RID | UTSR0_RBB | UTSR0_REB); + + if (status & UTSR0_RFS) { + /* + * There are at least 4 bytes in the FIFO. Read 3 bytes + * and leave the rest to the block below. + */ + async_unwrap_char(dev, &si->stats, &si->rx_buff, Ser2UTDR); + async_unwrap_char(dev, &si->stats, &si->rx_buff, Ser2UTDR); + async_unwrap_char(dev, &si->stats, &si->rx_buff, Ser2UTDR); + } + + if (status & (UTSR0_RFS | UTSR0_RID)) { + /* + * Fifo contains more than 1 character. + */ + do { + async_unwrap_char(dev, &si->stats, &si->rx_buff, + Ser2UTDR); + } while (Ser2UTSR1 & UTSR1_RNE); + + dev->last_rx = jiffies; + } + + if (status & UTSR0_TFS && si->tx_buff.len) { + /* + * Transmitter FIFO is not full + */ + do { + Ser2UTDR = *si->tx_buff.data++; + si->tx_buff.len -= 1; + } while (Ser2UTSR1 & UTSR1_TNF && si->tx_buff.len); + + if (si->tx_buff.len == 0) { + si->stats.tx_packets++; + si->stats.tx_bytes += si->tx_buff.data - + si->tx_buff.head; + + /* + * We need to ensure that the transmitter has + * finished. + */ + do + rmb(); + while (Ser2UTSR1 & UTSR1_TBY); + + /* + * Ok, we've finished transmitting. Now enable + * the receiver. Sometimes we get a receive IRQ + * immediately after a transmit... + */ + Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID; + Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE; + + if (si->newspeed) { + sa1100_irda_set_speed(si, si->newspeed); + si->newspeed = 0; + } + + /* I'm hungry! */ + netif_wake_queue(dev); + } + } +} + +static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev) +{ + struct sk_buff *skb = si->rxskb; + dma_addr_t dma_addr; + unsigned int len, stat, data; + + if (!skb) { + printk(KERN_ERR "sa1100_ir: SKB is NULL!\n"); + return; + } + + /* + * Get the current data position. + */ + dma_addr = sa1100_get_dma_pos(si->rxdma); + len = dma_addr - si->rxbuf_dma; + if (len > HPSIR_MAX_RXLEN) + len = HPSIR_MAX_RXLEN; + dma_unmap_single(si->dev, si->rxbuf_dma, len, DMA_FROM_DEVICE); + + do { + /* + * Read Status, and then Data. + */ + stat = Ser2HSSR1; + rmb(); + data = Ser2HSDR; + + if (stat & (HSSR1_CRE | HSSR1_ROR)) { + si->stats.rx_errors++; + if (stat & HSSR1_CRE) + si->stats.rx_crc_errors++; + if (stat & HSSR1_ROR) + si->stats.rx_frame_errors++; + } else + skb->data[len++] = data; + + /* + * If we hit the end of frame, there's + * no point in continuing. + */ + if (stat & HSSR1_EOF) + break; + } while (Ser2HSSR0 & HSSR0_EIF); + + if (stat & HSSR1_EOF) { + si->rxskb = NULL; + + skb_put(skb, len); + skb->dev = dev; + skb->mac.raw = skb->data; + skb->protocol = htons(ETH_P_IRDA); + si->stats.rx_packets++; + si->stats.rx_bytes += len; + + /* + * Before we pass the buffer up, allocate a new one. + */ + sa1100_irda_rx_alloc(si); + + netif_rx(skb); + dev->last_rx = jiffies; + } else { + /* + * Remap the buffer. + */ + si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data, + HPSIR_MAX_RXLEN, + DMA_FROM_DEVICE); + } +} + +/* + * FIR format interrupt service routine. We only have to + * handle RX events; transmit events go via the TX DMA handler. + * + * No matter what, we disable RX, process, and the restart RX. + */ +static void sa1100_irda_fir_irq(struct net_device *dev) +{ + struct sa1100_irda *si = dev->priv; + + /* + * Stop RX DMA + */ + sa1100_stop_dma(si->rxdma); + + /* + * Framing error - we throw away the packet completely. + * Clearing RXE flushes the error conditions and data + * from the fifo. + */ + if (Ser2HSSR0 & (HSSR0_FRE | HSSR0_RAB)) { + si->stats.rx_errors++; + + if (Ser2HSSR0 & HSSR0_FRE) + si->stats.rx_frame_errors++; + + /* + * Clear out the DMA... + */ + Ser2HSCR0 = si->hscr0 | HSCR0_HSSP; + + /* + * Clear selected status bits now, so we + * don't miss them next time around. + */ + Ser2HSSR0 = HSSR0_FRE | HSSR0_RAB; + } + + /* + * Deal with any receive errors. The any of the lowest + * 8 bytes in the FIFO may contain an error. We must read + * them one by one. The "error" could even be the end of + * packet! + */ + if (Ser2HSSR0 & HSSR0_EIF) + sa1100_irda_fir_error(si, dev); + + /* + * No matter what happens, we must restart reception. + */ + sa1100_irda_rx_dma_start(si); +} + +static irqreturn_t sa1100_irda_irq(int irq, void *dev_id, struct pt_regs *regs) +{ + struct net_device *dev = dev_id; + if (IS_FIR(((struct sa1100_irda *)dev->priv))) + sa1100_irda_fir_irq(dev); + else + sa1100_irda_hpsir_irq(dev); + return IRQ_HANDLED; +} + +/* + * TX DMA completion handler. + */ +static void sa1100_irda_txdma_irq(void *id) +{ + struct net_device *dev = id; + struct sa1100_irda *si = dev->priv; + struct sk_buff *skb = si->txskb; + + si->txskb = NULL; + + /* + * Wait for the transmission to complete. Unfortunately, + * the hardware doesn't give us an interrupt to indicate + * "end of frame". + */ + do + rmb(); + while (!(Ser2HSSR0 & HSSR0_TUR) || Ser2HSSR1 & HSSR1_TBY); + + /* + * Clear the transmit underrun bit. + */ + Ser2HSSR0 = HSSR0_TUR; + + /* + * Do we need to change speed? Note that we're lazy + * here - we don't free the old rxskb. We don't need + * to allocate a buffer either. + */ + if (si->newspeed) { + sa1100_irda_set_speed(si, si->newspeed); + si->newspeed = 0; + } + + /* + * Start reception. This disables the transmitter for + * us. This will be using the existing RX buffer. + */ + sa1100_irda_rx_dma_start(si); + + /* + * Account and free the packet. + */ + if (skb) { + dma_unmap_single(si->dev, si->txbuf_dma, skb->len, DMA_TO_DEVICE); + si->stats.tx_packets ++; + si->stats.tx_bytes += skb->len; + dev_kfree_skb_irq(skb); + } + + /* + * Make sure that the TX queue is available for sending + * (for retries). TX has priority over RX at all times. + */ + netif_wake_queue(dev); +} + +static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct sa1100_irda *si = dev->priv; + int speed = irda_get_next_speed(skb); + + /* + * Does this packet contain a request to change the interface + * speed? If so, remember it until we complete the transmission + * of this frame. + */ + if (speed != si->speed && speed != -1) + si->newspeed = speed; + + /* + * If this is an empty frame, we can bypass a lot. + */ + if (skb->len == 0) { + if (si->newspeed) { + si->newspeed = 0; + sa1100_irda_set_speed(si, speed); + } + dev_kfree_skb(skb); + return 0; + } + + if (!IS_FIR(si)) { + netif_stop_queue(dev); + + si->tx_buff.data = si->tx_buff.head; + si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data, + si->tx_buff.truesize); + + /* + * Set the transmit interrupt enable. This will fire + * off an interrupt immediately. Note that we disable + * the receiver so we won't get spurious characteres + * received. + */ + Ser2UTCR3 = UTCR3_TIE | UTCR3_TXE; + + dev_kfree_skb(skb); + } else { + int mtt = irda_get_mtt(skb); + + /* + * We must not be transmitting... + */ + if (si->txskb) + BUG(); + + netif_stop_queue(dev); + + si->txskb = skb; + si->txbuf_dma = dma_map_single(si->dev, skb->data, + skb->len, DMA_TO_DEVICE); + + sa1100_start_dma(si->txdma, si->txbuf_dma, skb->len); + + /* + * If we have a mean turn-around time, impose the specified + * specified delay. We could shorten this by timing from + * the point we received the packet. + */ + if (mtt) + udelay(mtt); + + Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_TXE; + } + + dev->trans_start = jiffies; + + return 0; +} + +static int +sa1100_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd) +{ + struct if_irda_req *rq = (struct if_irda_req *)ifreq; + struct sa1100_irda *si = dev->priv; + int ret = -EOPNOTSUPP; + + switch (cmd) { + case SIOCSBANDWIDTH: + if (capable(CAP_NET_ADMIN)) { + /* + * We are unable to set the speed if the + * device is not running. + */ + if (si->open) { + ret = sa1100_irda_set_speed(si, + rq->ifr_baudrate); + } else { + printk("sa1100_irda_ioctl: SIOCSBANDWIDTH: !netif_running\n"); + ret = 0; + } + } + break; + + case SIOCSMEDIABUSY: + ret = -EPERM; + if (capable(CAP_NET_ADMIN)) { + irda_device_set_media_busy(dev, TRUE); + ret = 0; + } + break; + + case SIOCGRECEIVING: + rq->ifr_receiving = IS_FIR(si) ? 0 + : si->rx_buff.state != OUTSIDE_FRAME; + break; + + default: + break; + } + + return ret; +} + +static struct net_device_stats *sa1100_irda_stats(struct net_device *dev) +{ + struct sa1100_irda *si = dev->priv; + return &si->stats; +} + +static int sa1100_irda_start(struct net_device *dev) +{ + struct sa1100_irda *si = dev->priv; + int err; + + si->speed = 9600; + + err = request_irq(dev->irq, sa1100_irda_irq, 0, dev->name, dev); + if (err) + goto err_irq; + + err = sa1100_request_dma(DMA_Ser2HSSPRd, "IrDA receive", + NULL, NULL, &si->rxdma); + if (err) + goto err_rx_dma; + + err = sa1100_request_dma(DMA_Ser2HSSPWr, "IrDA transmit", + sa1100_irda_txdma_irq, dev, &si->txdma); + if (err) + goto err_tx_dma; + + /* + * The interrupt must remain disabled for now. + */ + disable_irq(dev->irq); + + /* + * Setup the serial port for the specified speed. + */ + err = sa1100_irda_startup(si); + if (err) + goto err_startup; + + /* + * Open a new IrLAP layer instance. + */ + si->irlap = irlap_open(dev, &si->qos, "sa1100"); + err = -ENOMEM; + if (!si->irlap) + goto err_irlap; + + /* + * Now enable the interrupt and start the queue + */ + si->open = 1; + sa1100_set_power(si, power_level); /* low power mode */ + enable_irq(dev->irq); + netif_start_queue(dev); + return 0; + +err_irlap: + si->open = 0; + sa1100_irda_shutdown(si); +err_startup: + sa1100_free_dma(si->txdma); +err_tx_dma: + sa1100_free_dma(si->rxdma); +err_rx_dma: + free_irq(dev->irq, dev); +err_irq: + return err; +} + +static int sa1100_irda_stop(struct net_device *dev) +{ + struct sa1100_irda *si = dev->priv; + + disable_irq(dev->irq); + sa1100_irda_shutdown(si); + + /* + * If we have been doing DMA receive, make sure we + * tidy that up cleanly. + */ + if (si->rxskb) { + dma_unmap_single(si->dev, si->rxbuf_dma, HPSIR_MAX_RXLEN, + DMA_FROM_DEVICE); + dev_kfree_skb(si->rxskb); + si->rxskb = NULL; + } + + /* Stop IrLAP */ + if (si->irlap) { + irlap_close(si->irlap); + si->irlap = NULL; + } + + netif_stop_queue(dev); + si->open = 0; + + /* + * Free resources + */ + sa1100_free_dma(si->txdma); + sa1100_free_dma(si->rxdma); + free_irq(dev->irq, dev); + + sa1100_set_power(si, 0); + + return 0; +} + +static int sa1100_irda_init_iobuf(iobuff_t *io, int size) +{ + io->head = kmalloc(size, GFP_KERNEL | GFP_DMA); + if (io->head != NULL) { + io->truesize = size; + io->in_frame = FALSE; + io->state = OUTSIDE_FRAME; + io->data = io->head; + } + return io->head ? 0 : -ENOMEM; +} + +static int sa1100_irda_probe(struct device *_dev) +{ + struct platform_device *pdev = to_platform_device(_dev); + struct net_device *dev; + struct sa1100_irda *si; + unsigned int baudrate_mask; + int err; + + if (!pdev->dev.platform_data) + return -EINVAL; + + err = request_mem_region(__PREG(Ser2UTCR0), 0x24, "IrDA") ? 0 : -EBUSY; + if (err) + goto err_mem_1; + err = request_mem_region(__PREG(Ser2HSCR0), 0x1c, "IrDA") ? 0 : -EBUSY; + if (err) + goto err_mem_2; + err = request_mem_region(__PREG(Ser2HSCR2), 0x04, "IrDA") ? 0 : -EBUSY; + if (err) + goto err_mem_3; + + dev = alloc_irdadev(sizeof(struct sa1100_irda)); + if (!dev) + goto err_mem_4; + + si = dev->priv; + si->dev = &pdev->dev; + si->pdata = pdev->dev.platform_data; + + /* + * Initialise the HP-SIR buffers + */ + err = sa1100_irda_init_iobuf(&si->rx_buff, 14384); + if (err) + goto err_mem_5; + err = sa1100_irda_init_iobuf(&si->tx_buff, 4000); + if (err) + goto err_mem_5; + + dev->hard_start_xmit = sa1100_irda_hard_xmit; + dev->open = sa1100_irda_start; + dev->stop = sa1100_irda_stop; + dev->do_ioctl = sa1100_irda_ioctl; + dev->get_stats = sa1100_irda_stats; + dev->irq = IRQ_Ser2ICP; + + irda_init_max_qos_capabilies(&si->qos); + + /* + * We support original IRDA up to 115k2. (we don't currently + * support 4Mbps). Min Turn Time set to 1ms or greater. + */ + baudrate_mask = IR_9600; + + switch (max_rate) { + case 4000000: baudrate_mask |= IR_4000000 << 8; + case 115200: baudrate_mask |= IR_115200; + case 57600: baudrate_mask |= IR_57600; + case 38400: baudrate_mask |= IR_38400; + case 19200: baudrate_mask |= IR_19200; + } + + si->qos.baud_rate.bits &= baudrate_mask; + si->qos.min_turn_time.bits = 7; + + irda_qos_bits_to_value(&si->qos); + + si->utcr4 = UTCR4_HPSIR; + if (tx_lpm) + si->utcr4 |= UTCR4_Z1_6us; + + /* + * Initially enable HP-SIR modulation, and ensure that the port + * is disabled. + */ + Ser2UTCR3 = 0; + Ser2UTCR4 = si->utcr4; + Ser2HSCR0 = HSCR0_UART; + + err = register_netdev(dev); + if (err == 0) + dev_set_drvdata(&pdev->dev, dev); + + if (err) { + err_mem_5: + kfree(si->tx_buff.head); + kfree(si->rx_buff.head); + free_netdev(dev); + err_mem_4: + release_mem_region(__PREG(Ser2HSCR2), 0x04); + err_mem_3: + release_mem_region(__PREG(Ser2HSCR0), 0x1c); + err_mem_2: + release_mem_region(__PREG(Ser2UTCR0), 0x24); + } + err_mem_1: + return err; +} + +static int sa1100_irda_remove(struct device *_dev) +{ + struct net_device *dev = dev_get_drvdata(_dev); + + if (dev) { + struct sa1100_irda *si = dev->priv; + unregister_netdev(dev); + kfree(si->tx_buff.head); + kfree(si->rx_buff.head); + free_netdev(dev); + } + + release_mem_region(__PREG(Ser2HSCR2), 0x04); + release_mem_region(__PREG(Ser2HSCR0), 0x1c); + release_mem_region(__PREG(Ser2UTCR0), 0x24); + + return 0; +} + +static struct device_driver sa1100ir_driver = { + .name = "sa11x0-ir", + .bus = &platform_bus_type, + .probe = sa1100_irda_probe, + .remove = sa1100_irda_remove, + .suspend = sa1100_irda_suspend, + .resume = sa1100_irda_resume, +}; + +static int __init sa1100_irda_init(void) +{ + /* + * Limit power level a sensible range. + */ + if (power_level < 1) + power_level = 1; + if (power_level > 3) + power_level = 3; + + return driver_register(&sa1100ir_driver); +} + +static void __exit sa1100_irda_exit(void) +{ + driver_unregister(&sa1100ir_driver); +} + +module_init(sa1100_irda_init); +module_exit(sa1100_irda_exit); +module_param(power_level, int, 0); +module_param(tx_lpm, int, 0); +module_param(max_rate, int, 0); + +MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); +MODULE_DESCRIPTION("StrongARM SA1100 IrDA driver"); +MODULE_LICENSE("GPL"); +MODULE_PARM_DESC(power_level, "IrDA power level, 1 (low) to 3 (high)"); +MODULE_PARM_DESC(tx_lpm, "Enable transmitter low power (1.6us) mode"); +MODULE_PARM_DESC(max_rate, "Maximum baud rate (4000000, 115200, 57600, 38400, 19200, 9600)"); |