diff options
Diffstat (limited to 'drivers/net/irda/sa1100_ir.c')
| -rw-r--r-- | drivers/net/irda/sa1100_ir.c | 1150 |
1 files changed, 0 insertions, 1150 deletions
diff --git a/drivers/net/irda/sa1100_ir.c b/drivers/net/irda/sa1100_ir.c deleted file mode 100644 index b6e44ff4e373..000000000000 --- a/drivers/net/irda/sa1100_ir.c +++ /dev/null @@ -1,1150 +0,0 @@ -/* - * 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_level:level - set the transmitter power level - * tx_lpm:0|1 - set transmit low power mode - */ -#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/platform_device.h> -#include <linux/dma-mapping.h> -#include <linux/dmaengine.h> -#include <linux/sa11x0-dma.h> - -#include <net/irda/irda.h> -#include <net/irda/wrapper.h> -#include <net/irda/irda_device.h> - -#include <mach/hardware.h> -#include <linux/platform_data/irda-sa11x0.h> - -static int power_level = 3; -static int tx_lpm; -static int max_rate = 4000000; - -struct sa1100_buf { - struct device *dev; - struct sk_buff *skb; - struct scatterlist sg; - struct dma_chan *chan; - dma_cookie_t cookie; -}; - -struct sa1100_irda { - unsigned char utcr4; - unsigned char power; - unsigned char open; - - int speed; - int newspeed; - - struct sa1100_buf dma_rx; - struct sa1100_buf dma_tx; - - struct device *dev; - struct irda_platform_data *pdata; - struct irlap_cb *irlap; - struct qos_info qos; - - iobuff_t tx_buff; - iobuff_t rx_buff; - - int (*tx_start)(struct sk_buff *, struct net_device *, struct sa1100_irda *); - irqreturn_t (*irq)(struct net_device *, struct sa1100_irda *); -}; - -static int sa1100_irda_set_speed(struct sa1100_irda *, int); - -#define IS_FIR(si) ((si)->speed >= 4000000) - -#define HPSIR_MAX_RXLEN 2047 - -static struct dma_slave_config sa1100_irda_sir_tx = { - .direction = DMA_TO_DEVICE, - .dst_addr = __PREG(Ser2UTDR), - .dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE, - .dst_maxburst = 4, -}; - -static struct dma_slave_config sa1100_irda_fir_rx = { - .direction = DMA_FROM_DEVICE, - .src_addr = __PREG(Ser2HSDR), - .src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE, - .src_maxburst = 8, -}; - -static struct dma_slave_config sa1100_irda_fir_tx = { - .direction = DMA_TO_DEVICE, - .dst_addr = __PREG(Ser2HSDR), - .dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE, - .dst_maxburst = 8, -}; - -static unsigned sa1100_irda_dma_xferred(struct sa1100_buf *buf) -{ - struct dma_chan *chan = buf->chan; - struct dma_tx_state state; - enum dma_status status; - - status = chan->device->device_tx_status(chan, buf->cookie, &state); - if (status != DMA_PAUSED) - return 0; - - return sg_dma_len(&buf->sg) - state.residue; -} - -static int sa1100_irda_dma_request(struct device *dev, struct sa1100_buf *buf, - const char *name, struct dma_slave_config *cfg) -{ - dma_cap_mask_t m; - int ret; - - dma_cap_zero(m); - dma_cap_set(DMA_SLAVE, m); - - buf->chan = dma_request_channel(m, sa11x0_dma_filter_fn, (void *)name); - if (!buf->chan) { - dev_err(dev, "unable to request DMA channel for %s\n", - name); - return -ENOENT; - } - - ret = dmaengine_slave_config(buf->chan, cfg); - if (ret) - dev_warn(dev, "DMA slave_config for %s returned %d\n", - name, ret); - - buf->dev = buf->chan->device->dev; - - return 0; -} - -static void sa1100_irda_dma_start(struct sa1100_buf *buf, - enum dma_transfer_direction dir, dma_async_tx_callback cb, void *cb_p) -{ - struct dma_async_tx_descriptor *desc; - struct dma_chan *chan = buf->chan; - - desc = dmaengine_prep_slave_sg(chan, &buf->sg, 1, dir, - DMA_PREP_INTERRUPT | DMA_CTRL_ACK); - if (desc) { - desc->callback = cb; - desc->callback_param = cb_p; - buf->cookie = dmaengine_submit(desc); - dma_async_issue_pending(chan); - } -} - -/* - * Allocate and map the receive buffer, unless it is already allocated. - */ -static int sa1100_irda_rx_alloc(struct sa1100_irda *si) -{ - if (si->dma_rx.skb) - return 0; - - si->dma_rx.skb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC); - if (!si->dma_rx.skb) { - 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->dma_rx.skb, 1); - - sg_set_buf(&si->dma_rx.sg, si->dma_rx.skb->data, HPSIR_MAX_RXLEN); - if (dma_map_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE) == 0) { - dev_kfree_skb_any(si->dma_rx.skb); - return -ENOMEM; - } - - 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->dma_rx.skb) { - printk(KERN_ERR "sa1100_ir: rx buffer went missing\n"); - return; - } - - /* - * First empty receive FIFO - */ - Ser2HSCR0 = HSCR0_HSSP; - - /* - * Enable the DMA, receiver and receive interrupt. - */ - dmaengine_terminate_all(si->dma_rx.chan); - sa1100_irda_dma_start(&si->dma_rx, DMA_DEV_TO_MEM, NULL, NULL); - - Ser2HSCR0 = HSCR0_HSSP | HSCR0_RXE; -} - -static void sa1100_irda_check_speed(struct sa1100_irda *si) -{ - if (si->newspeed) { - sa1100_irda_set_speed(si, si->newspeed); - si->newspeed = 0; - } -} - -/* - * HP-SIR format support. - */ -static void sa1100_irda_sirtxdma_irq(void *id) -{ - struct net_device *dev = id; - struct sa1100_irda *si = netdev_priv(dev); - - dma_unmap_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE); - dev_kfree_skb(si->dma_tx.skb); - si->dma_tx.skb = NULL; - - dev->stats.tx_packets++; - dev->stats.tx_bytes += sg_dma_len(&si->dma_tx.sg); - - /* 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; - - sa1100_irda_check_speed(si); - - /* I'm hungry! */ - netif_wake_queue(dev); -} - -static int sa1100_irda_sir_tx_start(struct sk_buff *skb, struct net_device *dev, - struct sa1100_irda *si) -{ - si->tx_buff.data = si->tx_buff.head; - si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data, - si->tx_buff.truesize); - - si->dma_tx.skb = skb; - sg_set_buf(&si->dma_tx.sg, si->tx_buff.data, si->tx_buff.len); - if (dma_map_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE) == 0) { - si->dma_tx.skb = NULL; - netif_wake_queue(dev); - dev->stats.tx_dropped++; - return NETDEV_TX_OK; - } - - sa1100_irda_dma_start(&si->dma_tx, DMA_MEM_TO_DEV, sa1100_irda_sirtxdma_irq, dev); - - /* - * The mean turn-around time is enforced by XBOF padding, - * so we don't have to do anything special here. - */ - Ser2UTCR3 = UTCR3_TXE; - - return NETDEV_TX_OK; -} - -static irqreturn_t sa1100_irda_sir_irq(struct net_device *dev, struct sa1100_irda *si) -{ - 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)) { - dev->stats.rx_errors++; - if (stat & UTSR1_FRE) - dev->stats.rx_frame_errors++; - if (stat & UTSR1_ROR) - dev->stats.rx_fifo_errors++; - } else - async_unwrap_char(dev, &dev->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, &dev->stats, &si->rx_buff, Ser2UTDR); - async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR); - async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR); - } - - if (status & (UTSR0_RFS | UTSR0_RID)) { - /* - * Fifo contains more than 1 character. - */ - do { - async_unwrap_char(dev, &dev->stats, &si->rx_buff, - Ser2UTDR); - } while (Ser2UTSR1 & UTSR1_RNE); - - } - - return IRQ_HANDLED; -} - -/* - * FIR format support. - */ -static void sa1100_irda_firtxdma_irq(void *id) -{ - struct net_device *dev = id; - struct sa1100_irda *si = netdev_priv(dev); - struct sk_buff *skb; - - /* - * 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 dma_rx.skb. We don't need - * to allocate a buffer either. - */ - sa1100_irda_check_speed(si); - - /* - * 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. */ - skb = si->dma_tx.skb; - if (skb) { - dma_unmap_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, - DMA_TO_DEVICE); - dev->stats.tx_packets ++; - dev->stats.tx_bytes += skb->len; - dev_kfree_skb_irq(skb); - si->dma_tx.skb = NULL; - } - - /* - * 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_fir_tx_start(struct sk_buff *skb, struct net_device *dev, - struct sa1100_irda *si) -{ - int mtt = irda_get_mtt(skb); - - si->dma_tx.skb = skb; - sg_set_buf(&si->dma_tx.sg, skb->data, skb->len); - if (dma_map_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE) == 0) { - si->dma_tx.skb = NULL; - netif_wake_queue(dev); - dev->stats.tx_dropped++; - dev_kfree_skb(skb); - return NETDEV_TX_OK; - } - - sa1100_irda_dma_start(&si->dma_tx, DMA_MEM_TO_DEV, sa1100_irda_firtxdma_irq, dev); - - /* - * 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 = HSCR0_HSSP | HSCR0_TXE; - - return NETDEV_TX_OK; -} - -static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev) -{ - struct sk_buff *skb = si->dma_rx.skb; - unsigned int len, stat, data; - - if (!skb) { - printk(KERN_ERR "sa1100_ir: SKB is NULL!\n"); - return; - } - - /* - * Get the current data position. - */ - len = sa1100_irda_dma_xferred(&si->dma_rx); - if (len > HPSIR_MAX_RXLEN) - len = HPSIR_MAX_RXLEN; - dma_unmap_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE); - - do { - /* - * Read Status, and then Data. - */ - stat = Ser2HSSR1; - rmb(); - data = Ser2HSDR; - - if (stat & (HSSR1_CRE | HSSR1_ROR)) { - dev->stats.rx_errors++; - if (stat & HSSR1_CRE) - dev->stats.rx_crc_errors++; - if (stat & HSSR1_ROR) - dev->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->dma_rx.skb = NULL; - - skb_put(skb, len); - skb->dev = dev; - skb_reset_mac_header(skb); - skb->protocol = htons(ETH_P_IRDA); - dev->stats.rx_packets++; - dev->stats.rx_bytes += len; - - /* - * Before we pass the buffer up, allocate a new one. - */ - sa1100_irda_rx_alloc(si); - - netif_rx(skb); - } else { - /* - * Remap the buffer - it was previously mapped, and we - * hope that this succeeds. - */ - dma_map_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE); - } -} - -/* - * We only have to handle RX events here; transmit events go via the TX - * DMA handler. We disable RX, process, and the restart RX. - */ -static irqreturn_t sa1100_irda_fir_irq(struct net_device *dev, struct sa1100_irda *si) -{ - /* - * Stop RX DMA - */ - dmaengine_pause(si->dma_rx.chan); - - /* - * 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)) { - dev->stats.rx_errors++; - - if (Ser2HSSR0 & HSSR0_FRE) - dev->stats.rx_frame_errors++; - - /* - * Clear out the DMA... - */ - Ser2HSCR0 = 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); - - return IRQ_HANDLED; -} - -/* - * 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, and configure transmit. */ - if (IS_FIR(si)) { - dmaengine_terminate_all(si->dma_rx.chan); - dmaengine_slave_config(si->dma_tx.chan, - &sa1100_irda_sir_tx); - } - - 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; - si->tx_start = sa1100_irda_sir_tx_start; - si->irq = sa1100_irda_sir_irq; - - local_irq_restore(flags); - ret = 0; - break; - - case 4000000: - if (!IS_FIR(si)) - dmaengine_slave_config(si->dma_tx.chan, - &sa1100_irda_fir_tx); - - local_irq_save(flags); - - Ser2HSSR0 = 0xff; - Ser2HSCR0 = HSCR0_HSSP; - Ser2UTCR3 = 0; - - si->speed = speed; - si->tx_start = sa1100_irda_fir_tx_start; - si->irq = sa1100_irda_fir_irq; - - 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 irqreturn_t sa1100_irda_irq(int irq, void *dev_id) -{ - struct net_device *dev = dev_id; - struct sa1100_irda *si = netdev_priv(dev); - - return si->irq(dev, si); -} - -static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev) -{ - struct sa1100_irda *si = netdev_priv(dev); - 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) { - sa1100_irda_check_speed(si); - dev_kfree_skb(skb); - return NETDEV_TX_OK; - } - - netif_stop_queue(dev); - - /* We must not already have a skb to transmit... */ - BUG_ON(si->dma_tx.skb); - - return si->tx_start(skb, dev, si); -} - -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 = netdev_priv(dev); - 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 int sa1100_irda_startup(struct sa1100_irda *si) -{ - int ret; - - /* - * Ensure that the ports for this device are setup correctly. - */ - if (si->pdata->startup) { - ret = si->pdata->startup(si->dev); - if (ret) - return ret; - } - - /* - * 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. - */ - dmaengine_terminate_all(si->dma_rx.chan); - dmaengine_terminate_all(si->dma_tx.chan); - - /* Disable the port. */ - Ser2UTCR3 = 0; - Ser2HSCR0 = 0; - - if (si->pdata->shutdown) - si->pdata->shutdown(si->dev); -} - -static int sa1100_irda_start(struct net_device *dev) -{ - struct sa1100_irda *si = netdev_priv(dev); - int err; - - si->speed = 9600; - - err = sa1100_irda_dma_request(si->dev, &si->dma_rx, "Ser2ICPRc", - &sa1100_irda_fir_rx); - if (err) - goto err_rx_dma; - - err = sa1100_irda_dma_request(si->dev, &si->dma_tx, "Ser2ICPTr", - &sa1100_irda_sir_tx); - if (err) - goto err_tx_dma; - - /* - * 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; - - err = request_irq(dev->irq, sa1100_irda_irq, 0, dev->name, dev); - if (err) - goto err_irq; - - /* - * Now enable the interrupt and start the queue - */ - si->open = 1; - sa1100_set_power(si, power_level); /* low power mode */ - - netif_start_queue(dev); - return 0; - -err_irq: - irlap_close(si->irlap); -err_irlap: - si->open = 0; - sa1100_irda_shutdown(si); -err_startup: - dma_release_channel(si->dma_tx.chan); -err_tx_dma: - dma_release_channel(si->dma_rx.chan); -err_rx_dma: - return err; -} - -static int sa1100_irda_stop(struct net_device *dev) -{ - struct sa1100_irda *si = netdev_priv(dev); - struct sk_buff *skb; - - netif_stop_queue(dev); - - si->open = 0; - sa1100_irda_shutdown(si); - - /* - * If we have been doing any DMA activity, make sure we - * tidy that up cleanly. - */ - skb = si->dma_rx.skb; - if (skb) { - dma_unmap_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, - DMA_FROM_DEVICE); - dev_kfree_skb(skb); - si->dma_rx.skb = NULL; - } - - skb = si->dma_tx.skb; - if (skb) { - dma_unmap_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, - DMA_TO_DEVICE); - dev_kfree_skb(skb); - si->dma_tx.skb = NULL; - } - - /* Stop IrLAP */ - if (si->irlap) { - irlap_close(si->irlap); - si->irlap = NULL; - } - - /* - * Free resources - */ - dma_release_channel(si->dma_tx.chan); - dma_release_channel(si->dma_rx.chan); - 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 const struct net_device_ops sa1100_irda_netdev_ops = { - .ndo_open = sa1100_irda_start, - .ndo_stop = sa1100_irda_stop, - .ndo_start_xmit = sa1100_irda_hard_xmit, - .ndo_do_ioctl = sa1100_irda_ioctl, -}; - -static int sa1100_irda_probe(struct platform_device *pdev) -{ - struct net_device *dev; - struct sa1100_irda *si; - unsigned int baudrate_mask; - int err, irq; - - if (!pdev->dev.platform_data) - return -EINVAL; - - irq = platform_get_irq(pdev, 0); - if (irq <= 0) - return irq < 0 ? irq : -ENXIO; - - 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) { - err = -ENOMEM; - goto err_mem_4; - } - - SET_NETDEV_DEV(dev, &pdev->dev); - - si = netdev_priv(dev); - si->dev = &pdev->dev; - si->pdata = pdev->dev.platform_data; - - sg_init_table(&si->dma_rx.sg, 1); - sg_init_table(&si->dma_tx.sg, 1); - - /* - * 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, IRDA_SIR_MAX_FRAME); - if (err) - goto err_mem_5; - - dev->netdev_ops = &sa1100_irda_netdev_ops; - dev->irq = irq; - - 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) - platform_set_drvdata(pdev, 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 platform_device *pdev) -{ - struct net_device *dev = platform_get_drvdata(pdev); - - if (dev) { - struct sa1100_irda *si = netdev_priv(dev); - 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; -} - -#ifdef CONFIG_PM -/* - * Suspend the IrDA interface. - */ -static int sa1100_irda_suspend(struct platform_device *pdev, pm_message_t state) -{ - struct net_device *dev = platform_get_drvdata(pdev); - struct sa1100_irda *si; - - if (!dev) - return 0; - - si = netdev_priv(dev); - 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 platform_device *pdev) -{ - struct net_device *dev = platform_get_drvdata(pdev); - struct sa1100_irda *si; - - if (!dev) - return 0; - - si = netdev_priv(dev); - 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 desirable. 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 - -static struct platform_driver sa1100ir_driver = { - .probe = sa1100_irda_probe, - .remove = sa1100_irda_remove, - .suspend = sa1100_irda_suspend, - .resume = sa1100_irda_resume, - .driver = { - .name = "sa11x0-ir", - }, -}; - -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 platform_driver_register(&sa1100ir_driver); -} - -static void __exit sa1100_irda_exit(void) -{ - platform_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)"); -MODULE_ALIAS("platform:sa11x0-ir"); |