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![Dmitry Eremin-Solenikov](/assets/img/avatar_default.png)
In the end asm/mach/irda.h header is not used by anybody except sa1100. Move the header to the platform data includes dir and rename it to irda-sa11x0.h. Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1150 lines
25 KiB
C
1150 lines
25 KiB
C
/*
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* linux/drivers/net/irda/sa1100_ir.c
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*
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* Copyright (C) 2000-2001 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Infra-red driver for the StrongARM SA1100 embedded microprocessor
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*
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* Note that we don't have to worry about the SA1111's DMA bugs in here,
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* so we use the straight forward dma_map_* functions with a null pointer.
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*
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* This driver takes one kernel command line parameter, sa1100ir=, with
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* the following options:
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* max_rate:baudrate - set the maximum baud rate
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* power_level:level - set the transmitter power level
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* tx_lpm:0|1 - set transmit low power mode
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <linux/rtnetlink.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmaengine.h>
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#include <linux/sa11x0-dma.h>
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#include <net/irda/irda.h>
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#include <net/irda/wrapper.h>
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#include <net/irda/irda_device.h>
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#include <mach/hardware.h>
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#include <linux/platform_data/irda-sa11x0.h>
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static int power_level = 3;
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static int tx_lpm;
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static int max_rate = 4000000;
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struct sa1100_buf {
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struct device *dev;
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struct sk_buff *skb;
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struct scatterlist sg;
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struct dma_chan *chan;
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dma_cookie_t cookie;
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};
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struct sa1100_irda {
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unsigned char utcr4;
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unsigned char power;
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unsigned char open;
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int speed;
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int newspeed;
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struct sa1100_buf dma_rx;
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struct sa1100_buf dma_tx;
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struct device *dev;
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struct irda_platform_data *pdata;
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struct irlap_cb *irlap;
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struct qos_info qos;
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iobuff_t tx_buff;
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iobuff_t rx_buff;
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int (*tx_start)(struct sk_buff *, struct net_device *, struct sa1100_irda *);
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irqreturn_t (*irq)(struct net_device *, struct sa1100_irda *);
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};
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static int sa1100_irda_set_speed(struct sa1100_irda *, int);
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#define IS_FIR(si) ((si)->speed >= 4000000)
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#define HPSIR_MAX_RXLEN 2047
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static struct dma_slave_config sa1100_irda_sir_tx = {
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.direction = DMA_TO_DEVICE,
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.dst_addr = __PREG(Ser2UTDR),
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.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
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.dst_maxburst = 4,
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};
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static struct dma_slave_config sa1100_irda_fir_rx = {
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.direction = DMA_FROM_DEVICE,
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.src_addr = __PREG(Ser2HSDR),
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.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
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.src_maxburst = 8,
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};
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static struct dma_slave_config sa1100_irda_fir_tx = {
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.direction = DMA_TO_DEVICE,
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.dst_addr = __PREG(Ser2HSDR),
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.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
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.dst_maxburst = 8,
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};
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static unsigned sa1100_irda_dma_xferred(struct sa1100_buf *buf)
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{
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struct dma_chan *chan = buf->chan;
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struct dma_tx_state state;
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enum dma_status status;
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status = chan->device->device_tx_status(chan, buf->cookie, &state);
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if (status != DMA_PAUSED)
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return 0;
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return sg_dma_len(&buf->sg) - state.residue;
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}
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static int sa1100_irda_dma_request(struct device *dev, struct sa1100_buf *buf,
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const char *name, struct dma_slave_config *cfg)
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{
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dma_cap_mask_t m;
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int ret;
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dma_cap_zero(m);
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dma_cap_set(DMA_SLAVE, m);
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buf->chan = dma_request_channel(m, sa11x0_dma_filter_fn, (void *)name);
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if (!buf->chan) {
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dev_err(dev, "unable to request DMA channel for %s\n",
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name);
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return -ENOENT;
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}
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ret = dmaengine_slave_config(buf->chan, cfg);
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if (ret)
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dev_warn(dev, "DMA slave_config for %s returned %d\n",
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name, ret);
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buf->dev = buf->chan->device->dev;
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return 0;
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}
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static void sa1100_irda_dma_start(struct sa1100_buf *buf,
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enum dma_transfer_direction dir, dma_async_tx_callback cb, void *cb_p)
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{
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struct dma_async_tx_descriptor *desc;
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struct dma_chan *chan = buf->chan;
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desc = dmaengine_prep_slave_sg(chan, &buf->sg, 1, dir,
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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if (desc) {
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desc->callback = cb;
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desc->callback_param = cb_p;
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buf->cookie = dmaengine_submit(desc);
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dma_async_issue_pending(chan);
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}
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}
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/*
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* Allocate and map the receive buffer, unless it is already allocated.
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*/
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static int sa1100_irda_rx_alloc(struct sa1100_irda *si)
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{
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if (si->dma_rx.skb)
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return 0;
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si->dma_rx.skb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC);
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if (!si->dma_rx.skb) {
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printk(KERN_ERR "sa1100_ir: out of memory for RX SKB\n");
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return -ENOMEM;
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}
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/*
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* Align any IP headers that may be contained
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* within the frame.
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*/
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skb_reserve(si->dma_rx.skb, 1);
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sg_set_buf(&si->dma_rx.sg, si->dma_rx.skb->data, HPSIR_MAX_RXLEN);
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if (dma_map_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE) == 0) {
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dev_kfree_skb_any(si->dma_rx.skb);
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return -ENOMEM;
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}
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return 0;
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}
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/*
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* We want to get here as soon as possible, and get the receiver setup.
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* We use the existing buffer.
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*/
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static void sa1100_irda_rx_dma_start(struct sa1100_irda *si)
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{
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if (!si->dma_rx.skb) {
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printk(KERN_ERR "sa1100_ir: rx buffer went missing\n");
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return;
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}
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/*
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* First empty receive FIFO
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*/
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Ser2HSCR0 = HSCR0_HSSP;
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/*
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* Enable the DMA, receiver and receive interrupt.
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*/
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dmaengine_terminate_all(si->dma_rx.chan);
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sa1100_irda_dma_start(&si->dma_rx, DMA_DEV_TO_MEM, NULL, NULL);
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Ser2HSCR0 = HSCR0_HSSP | HSCR0_RXE;
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}
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static void sa1100_irda_check_speed(struct sa1100_irda *si)
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{
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if (si->newspeed) {
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sa1100_irda_set_speed(si, si->newspeed);
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si->newspeed = 0;
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}
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}
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/*
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* HP-SIR format support.
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*/
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static void sa1100_irda_sirtxdma_irq(void *id)
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{
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struct net_device *dev = id;
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struct sa1100_irda *si = netdev_priv(dev);
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dma_unmap_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE);
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dev_kfree_skb(si->dma_tx.skb);
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si->dma_tx.skb = NULL;
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += sg_dma_len(&si->dma_tx.sg);
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/* We need to ensure that the transmitter has finished. */
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do
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rmb();
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while (Ser2UTSR1 & UTSR1_TBY);
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/*
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* Ok, we've finished transmitting. Now enable the receiver.
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* Sometimes we get a receive IRQ immediately after a transmit...
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*/
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Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
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Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
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sa1100_irda_check_speed(si);
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/* I'm hungry! */
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netif_wake_queue(dev);
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}
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static int sa1100_irda_sir_tx_start(struct sk_buff *skb, struct net_device *dev,
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struct sa1100_irda *si)
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{
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si->tx_buff.data = si->tx_buff.head;
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si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data,
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si->tx_buff.truesize);
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si->dma_tx.skb = skb;
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sg_set_buf(&si->dma_tx.sg, si->tx_buff.data, si->tx_buff.len);
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if (dma_map_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE) == 0) {
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si->dma_tx.skb = NULL;
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netif_wake_queue(dev);
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dev->stats.tx_dropped++;
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return NETDEV_TX_OK;
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}
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sa1100_irda_dma_start(&si->dma_tx, DMA_MEM_TO_DEV, sa1100_irda_sirtxdma_irq, dev);
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/*
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* The mean turn-around time is enforced by XBOF padding,
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* so we don't have to do anything special here.
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*/
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Ser2UTCR3 = UTCR3_TXE;
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return NETDEV_TX_OK;
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}
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static irqreturn_t sa1100_irda_sir_irq(struct net_device *dev, struct sa1100_irda *si)
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{
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int status;
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status = Ser2UTSR0;
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/*
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* Deal with any receive errors first. The bytes in error may be
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* the only bytes in the receive FIFO, so we do this first.
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*/
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while (status & UTSR0_EIF) {
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int stat, data;
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stat = Ser2UTSR1;
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data = Ser2UTDR;
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if (stat & (UTSR1_FRE | UTSR1_ROR)) {
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dev->stats.rx_errors++;
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if (stat & UTSR1_FRE)
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dev->stats.rx_frame_errors++;
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if (stat & UTSR1_ROR)
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dev->stats.rx_fifo_errors++;
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} else
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async_unwrap_char(dev, &dev->stats, &si->rx_buff, data);
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status = Ser2UTSR0;
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}
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/*
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* We must clear certain bits.
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*/
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Ser2UTSR0 = status & (UTSR0_RID | UTSR0_RBB | UTSR0_REB);
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if (status & UTSR0_RFS) {
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/*
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* There are at least 4 bytes in the FIFO. Read 3 bytes
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* and leave the rest to the block below.
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*/
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async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
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async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
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async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
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}
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if (status & (UTSR0_RFS | UTSR0_RID)) {
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/*
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* Fifo contains more than 1 character.
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*/
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do {
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async_unwrap_char(dev, &dev->stats, &si->rx_buff,
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Ser2UTDR);
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} while (Ser2UTSR1 & UTSR1_RNE);
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}
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return IRQ_HANDLED;
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}
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/*
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* FIR format support.
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*/
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static void sa1100_irda_firtxdma_irq(void *id)
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{
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struct net_device *dev = id;
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struct sa1100_irda *si = netdev_priv(dev);
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struct sk_buff *skb;
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/*
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* Wait for the transmission to complete. Unfortunately,
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* the hardware doesn't give us an interrupt to indicate
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* "end of frame".
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*/
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do
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rmb();
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while (!(Ser2HSSR0 & HSSR0_TUR) || Ser2HSSR1 & HSSR1_TBY);
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/*
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* Clear the transmit underrun bit.
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*/
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Ser2HSSR0 = HSSR0_TUR;
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/*
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* Do we need to change speed? Note that we're lazy
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* here - we don't free the old dma_rx.skb. We don't need
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* to allocate a buffer either.
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*/
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sa1100_irda_check_speed(si);
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/*
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* Start reception. This disables the transmitter for
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* us. This will be using the existing RX buffer.
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*/
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sa1100_irda_rx_dma_start(si);
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/* Account and free the packet. */
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skb = si->dma_tx.skb;
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if (skb) {
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dma_unmap_sg(si->dma_tx.dev, &si->dma_tx.sg, 1,
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DMA_TO_DEVICE);
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dev->stats.tx_packets ++;
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dev->stats.tx_bytes += skb->len;
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dev_kfree_skb_irq(skb);
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si->dma_tx.skb = NULL;
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}
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/*
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* Make sure that the TX queue is available for sending
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* (for retries). TX has priority over RX at all times.
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*/
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netif_wake_queue(dev);
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}
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static int sa1100_irda_fir_tx_start(struct sk_buff *skb, struct net_device *dev,
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struct sa1100_irda *si)
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{
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int mtt = irda_get_mtt(skb);
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si->dma_tx.skb = skb;
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sg_set_buf(&si->dma_tx.sg, skb->data, skb->len);
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if (dma_map_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE) == 0) {
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si->dma_tx.skb = NULL;
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netif_wake_queue(dev);
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dev->stats.tx_dropped++;
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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sa1100_irda_dma_start(&si->dma_tx, DMA_MEM_TO_DEV, sa1100_irda_firtxdma_irq, dev);
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/*
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* If we have a mean turn-around time, impose the specified
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* specified delay. We could shorten this by timing from
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* the point we received the packet.
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*/
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if (mtt)
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udelay(mtt);
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Ser2HSCR0 = HSCR0_HSSP | HSCR0_TXE;
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return NETDEV_TX_OK;
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}
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static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev)
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{
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struct sk_buff *skb = si->dma_rx.skb;
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unsigned int len, stat, data;
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if (!skb) {
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printk(KERN_ERR "sa1100_ir: SKB is NULL!\n");
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return;
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}
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/*
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* Get the current data position.
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*/
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len = sa1100_irda_dma_xferred(&si->dma_rx);
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if (len > HPSIR_MAX_RXLEN)
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len = HPSIR_MAX_RXLEN;
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dma_unmap_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE);
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do {
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/*
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* Read Status, and then Data.
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*/
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stat = Ser2HSSR1;
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rmb();
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data = Ser2HSDR;
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if (stat & (HSSR1_CRE | HSSR1_ROR)) {
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dev->stats.rx_errors++;
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if (stat & HSSR1_CRE)
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dev->stats.rx_crc_errors++;
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if (stat & HSSR1_ROR)
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dev->stats.rx_frame_errors++;
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} else
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skb->data[len++] = data;
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/*
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* If we hit the end of frame, there's
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* no point in continuing.
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*/
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if (stat & HSSR1_EOF)
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break;
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} while (Ser2HSSR0 & HSSR0_EIF);
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if (stat & HSSR1_EOF) {
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si->dma_rx.skb = NULL;
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skb_put(skb, len);
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skb->dev = dev;
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skb_reset_mac_header(skb);
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skb->protocol = htons(ETH_P_IRDA);
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dev->stats.rx_packets++;
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dev->stats.rx_bytes += len;
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/*
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* Before we pass the buffer up, allocate a new one.
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*/
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sa1100_irda_rx_alloc(si);
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netif_rx(skb);
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} else {
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/*
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* Remap the buffer - it was previously mapped, and we
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* hope that this succeeds.
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*/
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dma_map_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE);
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}
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}
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/*
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* We only have to handle RX events here; transmit events go via the TX
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* DMA handler. We disable RX, process, and the restart RX.
|
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*/
|
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static irqreturn_t sa1100_irda_fir_irq(struct net_device *dev, struct sa1100_irda *si)
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{
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/*
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* Stop RX DMA
|
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*/
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dmaengine_pause(si->dma_rx.chan);
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|
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/*
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* 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");
|