diff options
Diffstat (limited to 'arch/cris/arch-v10/drivers/sync_serial.c')
| -rw-r--r-- | arch/cris/arch-v10/drivers/sync_serial.c | 1463 |
1 files changed, 0 insertions, 1463 deletions
diff --git a/arch/cris/arch-v10/drivers/sync_serial.c b/arch/cris/arch-v10/drivers/sync_serial.c deleted file mode 100644 index ed1a568a7217..000000000000 --- a/arch/cris/arch-v10/drivers/sync_serial.c +++ /dev/null @@ -1,1463 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Simple synchronous serial port driver for ETRAX 100LX. - * - * Synchronous serial ports are used for continuous streamed data like audio. - * The default setting for this driver is compatible with the STA 013 MP3 - * decoder. The driver can easily be tuned to fit other audio encoder/decoders - * and SPI - * - * Copyright (c) 2001-2008 Axis Communications AB - * - * Author: Mikael Starvik, Johan Adolfsson - * - */ -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/major.h> -#include <linux/sched/signal.h> -#include <linux/interrupt.h> -#include <linux/poll.h> -#include <linux/init.h> -#include <linux/mutex.h> -#include <linux/timer.h> -#include <linux/wait.h> -#include <asm/irq.h> -#include <asm/dma.h> -#include <asm/io.h> -#include <arch/svinto.h> -#include <linux/uaccess.h> -#include <asm/sync_serial.h> -#include <arch/io_interface_mux.h> - -/* The receiver is a bit tricky because of the continuous stream of data.*/ -/* */ -/* Three DMA descriptors are linked together. Each DMA descriptor is */ -/* responsible for port->bufchunk of a common buffer. */ -/* */ -/* +---------------------------------------------+ */ -/* | +----------+ +----------+ +----------+ | */ -/* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+ */ -/* +----------+ +----------+ +----------+ */ -/* | | | */ -/* v v v */ -/* +-------------------------------------+ */ -/* | BUFFER | */ -/* +-------------------------------------+ */ -/* |<- data_avail ->| */ -/* readp writep */ -/* */ -/* If the application keeps up the pace readp will be right after writep.*/ -/* If the application can't keep the pace we have to throw away data. */ -/* The idea is that readp should be ready with the data pointed out by */ -/* Descr[i] when the DMA has filled in Descr[i+1]. */ -/* Otherwise we will discard */ -/* the rest of the data pointed out by Descr1 and set readp to the start */ -/* of Descr2 */ - -#define SYNC_SERIAL_MAJOR 125 - -/* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */ -/* words can be handled */ -#define IN_BUFFER_SIZE 12288 -#define IN_DESCR_SIZE 256 -#define NUM_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE) -#define OUT_BUFFER_SIZE 4096 - -#define DEFAULT_FRAME_RATE 0 -#define DEFAULT_WORD_RATE 7 - -/* NOTE: Enabling some debug will likely cause overrun or underrun, - * especially if manual mode is use. - */ -#define DEBUG(x) -#define DEBUGREAD(x) -#define DEBUGWRITE(x) -#define DEBUGPOLL(x) -#define DEBUGRXINT(x) -#define DEBUGTXINT(x) - -/* Define some macros to access ETRAX 100 registers */ -#define SETF(var, reg, field, val) \ - do { \ - var = (var & ~IO_MASK_(reg##_, field##_)) | \ - IO_FIELD_(reg##_, field##_, val); \ - } while (0) - -#define SETS(var, reg, field, val) \ - do { \ - var = (var & ~IO_MASK_(reg##_, field##_)) | \ - IO_STATE_(reg##_, field##_, _##val); \ - } while (0) - -struct sync_port { - /* Etrax registers and bits*/ - const volatile unsigned *const status; - volatile unsigned *const ctrl_data; - volatile unsigned *const output_dma_first; - volatile unsigned char *const output_dma_cmd; - volatile unsigned char *const output_dma_clr_irq; - volatile unsigned *const input_dma_first; - volatile unsigned char *const input_dma_cmd; - volatile unsigned *const input_dma_descr; - /* 8*4 */ - volatile unsigned char *const input_dma_clr_irq; - volatile unsigned *const data_out; - const volatile unsigned *const data_in; - char data_avail_bit; /* In R_IRQ_MASK1_RD/SET/CLR */ - char transmitter_ready_bit; /* In R_IRQ_MASK1_RD/SET/CLR */ - char input_dma_descr_bit; /* In R_IRQ_MASK2_RD */ - - char output_dma_bit; /* In R_IRQ_MASK2_RD */ - /* End of fields initialised in array */ - char started; /* 1 if port has been started */ - char port_nbr; /* Port 0 or 1 */ - char busy; /* 1 if port is busy */ - - char enabled; /* 1 if port is enabled */ - char use_dma; /* 1 if port uses dma */ - char tr_running; - - char init_irqs; - - /* Register shadow */ - unsigned int ctrl_data_shadow; - /* Remaining bytes for current transfer */ - volatile unsigned int out_count; - /* Current position in out_buffer */ - unsigned char *outp; - /* 16*4 */ - /* Next byte to be read by application */ - volatile unsigned char *volatile readp; - /* Next byte to be written by etrax */ - volatile unsigned char *volatile writep; - - unsigned int in_buffer_size; - unsigned int inbufchunk; - struct etrax_dma_descr out_descr __attribute__ ((aligned(32))); - struct etrax_dma_descr in_descr[NUM_IN_DESCR] __attribute__ ((aligned(32))); - unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32))); - unsigned char in_buffer[IN_BUFFER_SIZE]__attribute__ ((aligned(32))); - unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32))); - struct etrax_dma_descr *next_rx_desc; - struct etrax_dma_descr *prev_rx_desc; - int full; - - wait_queue_head_t out_wait_q; - wait_queue_head_t in_wait_q; -}; - - -static DEFINE_MUTEX(sync_serial_mutex); -static int etrax_sync_serial_init(void); -static void initialize_port(int portnbr); -static inline int sync_data_avail(struct sync_port *port); - -static int sync_serial_open(struct inode *inode, struct file *file); -static int sync_serial_release(struct inode *inode, struct file *file); -static __poll_t sync_serial_poll(struct file *filp, poll_table *wait); - -static long sync_serial_ioctl(struct file *file, - unsigned int cmd, unsigned long arg); -static ssize_t sync_serial_write(struct file *file, const char *buf, - size_t count, loff_t *ppos); -static ssize_t sync_serial_read(struct file *file, char *buf, - size_t count, loff_t *ppos); - -#if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \ - defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \ - (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \ - defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))) -#define SYNC_SER_DMA -#endif - -static void send_word(struct sync_port *port); -static void start_dma(struct sync_port *port, const char *data, int count); -static void start_dma_in(struct sync_port *port); -#ifdef SYNC_SER_DMA -static irqreturn_t tr_interrupt(int irq, void *dev_id); -static irqreturn_t rx_interrupt(int irq, void *dev_id); -#endif -#if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \ - !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \ - (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \ - !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))) -#define SYNC_SER_MANUAL -#endif -#ifdef SYNC_SER_MANUAL -static irqreturn_t manual_interrupt(int irq, void *dev_id); -#endif - -/* The ports */ -static struct sync_port ports[] = { - { - .status = R_SYNC_SERIAL1_STATUS, - .ctrl_data = R_SYNC_SERIAL1_CTRL, - .output_dma_first = R_DMA_CH8_FIRST, - .output_dma_cmd = R_DMA_CH8_CMD, - .output_dma_clr_irq = R_DMA_CH8_CLR_INTR, - .input_dma_first = R_DMA_CH9_FIRST, - .input_dma_cmd = R_DMA_CH9_CMD, - .input_dma_descr = R_DMA_CH9_DESCR, - .input_dma_clr_irq = R_DMA_CH9_CLR_INTR, - .data_out = R_SYNC_SERIAL1_TR_DATA, - .data_in = R_SYNC_SERIAL1_REC_DATA, - .data_avail_bit = IO_BITNR(R_IRQ_MASK1_RD, ser1_data), - .transmitter_ready_bit = IO_BITNR(R_IRQ_MASK1_RD, ser1_ready), - .input_dma_descr_bit = IO_BITNR(R_IRQ_MASK2_RD, dma9_descr), - .output_dma_bit = IO_BITNR(R_IRQ_MASK2_RD, dma8_eop), - .init_irqs = 1, -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA) - .use_dma = 1, -#else - .use_dma = 0, -#endif - }, - { - .status = R_SYNC_SERIAL3_STATUS, - .ctrl_data = R_SYNC_SERIAL3_CTRL, - .output_dma_first = R_DMA_CH4_FIRST, - .output_dma_cmd = R_DMA_CH4_CMD, - .output_dma_clr_irq = R_DMA_CH4_CLR_INTR, - .input_dma_first = R_DMA_CH5_FIRST, - .input_dma_cmd = R_DMA_CH5_CMD, - .input_dma_descr = R_DMA_CH5_DESCR, - .input_dma_clr_irq = R_DMA_CH5_CLR_INTR, - .data_out = R_SYNC_SERIAL3_TR_DATA, - .data_in = R_SYNC_SERIAL3_REC_DATA, - .data_avail_bit = IO_BITNR(R_IRQ_MASK1_RD, ser3_data), - .transmitter_ready_bit = IO_BITNR(R_IRQ_MASK1_RD, ser3_ready), - .input_dma_descr_bit = IO_BITNR(R_IRQ_MASK2_RD, dma5_descr), - .output_dma_bit = IO_BITNR(R_IRQ_MASK2_RD, dma4_eop), - .init_irqs = 1, -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA) - .use_dma = 1, -#else - .use_dma = 0, -#endif - } -}; - -/* Register shadows */ -static unsigned sync_serial_prescale_shadow; - -#define NUMBER_OF_PORTS 2 - -static const struct file_operations sync_serial_fops = { - .owner = THIS_MODULE, - .write = sync_serial_write, - .read = sync_serial_read, - .poll = sync_serial_poll, - .unlocked_ioctl = sync_serial_ioctl, - .open = sync_serial_open, - .release = sync_serial_release, - .llseek = noop_llseek, -}; - -static int __init etrax_sync_serial_init(void) -{ - ports[0].enabled = 0; - ports[1].enabled = 0; - -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) - if (cris_request_io_interface(if_sync_serial_1, "sync_ser1")) { - printk(KERN_CRIT "ETRAX100LX sync_serial: " - "Could not allocate IO group for port %d\n", 0); - return -EBUSY; - } -#endif -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) - if (cris_request_io_interface(if_sync_serial_3, "sync_ser3")) { -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) - cris_free_io_interface(if_sync_serial_1); -#endif - printk(KERN_CRIT "ETRAX100LX sync_serial: " - "Could not allocate IO group for port %d\n", 1); - return -EBUSY; - } -#endif - - if (register_chrdev(SYNC_SERIAL_MAJOR, "sync serial", - &sync_serial_fops) < 0) { -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) - cris_free_io_interface(if_sync_serial_3); -#endif -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) - cris_free_io_interface(if_sync_serial_1); -#endif - printk("unable to get major for synchronous serial port\n"); - return -EBUSY; - } - - /* Deselect synchronous serial ports while configuring. */ - SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, async); - SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, async); - *R_GEN_CONFIG_II = gen_config_ii_shadow; - - /* Initialize Ports */ -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) - ports[0].enabled = 1; - SETS(port_pb_i2c_shadow, R_PORT_PB_I2C, syncser1, ss1extra); - SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, sync); -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA) - ports[0].use_dma = 1; -#else - ports[0].use_dma = 0; -#endif - initialize_port(0); -#endif - -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) - ports[1].enabled = 1; - SETS(port_pb_i2c_shadow, R_PORT_PB_I2C, syncser3, ss3extra); - SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, sync); -#if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA) - ports[1].use_dma = 1; -#else - ports[1].use_dma = 0; -#endif - initialize_port(1); -#endif - - *R_PORT_PB_I2C = port_pb_i2c_shadow; /* Use PB4/PB7 */ - - /* Set up timing */ - *R_SYNC_SERIAL_PRESCALE = sync_serial_prescale_shadow = ( - IO_STATE(R_SYNC_SERIAL_PRESCALE, clk_sel_u1, codec) | - IO_STATE(R_SYNC_SERIAL_PRESCALE, word_stb_sel_u1, external) | - IO_STATE(R_SYNC_SERIAL_PRESCALE, clk_sel_u3, codec) | - IO_STATE(R_SYNC_SERIAL_PRESCALE, word_stb_sel_u3, external) | - IO_STATE(R_SYNC_SERIAL_PRESCALE, prescaler, div4) | - IO_FIELD(R_SYNC_SERIAL_PRESCALE, frame_rate, - DEFAULT_FRAME_RATE) | - IO_FIELD(R_SYNC_SERIAL_PRESCALE, word_rate, DEFAULT_WORD_RATE) | - IO_STATE(R_SYNC_SERIAL_PRESCALE, warp_mode, normal)); - - /* Select synchronous ports */ - *R_GEN_CONFIG_II = gen_config_ii_shadow; - - printk(KERN_INFO "ETRAX 100LX synchronous serial port driver\n"); - return 0; -} - -static void __init initialize_port(int portnbr) -{ - struct sync_port *port = &ports[portnbr]; - - DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr)); - - port->started = 0; - port->port_nbr = portnbr; - port->busy = 0; - port->tr_running = 0; - - port->out_count = 0; - port->outp = port->out_buffer; - - port->readp = port->flip; - port->writep = port->flip; - port->in_buffer_size = IN_BUFFER_SIZE; - port->inbufchunk = IN_DESCR_SIZE; - port->next_rx_desc = &port->in_descr[0]; - port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR-1]; - port->prev_rx_desc->ctrl = d_eol; - - init_waitqueue_head(&port->out_wait_q); - init_waitqueue_head(&port->in_wait_q); - - port->ctrl_data_shadow = - IO_STATE(R_SYNC_SERIAL1_CTRL, tr_baud, c115k2Hz) | - IO_STATE(R_SYNC_SERIAL1_CTRL, mode, master_output) | - IO_STATE(R_SYNC_SERIAL1_CTRL, error, ignore) | - IO_STATE(R_SYNC_SERIAL1_CTRL, rec_enable, disable) | - IO_STATE(R_SYNC_SERIAL1_CTRL, f_synctype, normal) | - IO_STATE(R_SYNC_SERIAL1_CTRL, f_syncsize, word) | - IO_STATE(R_SYNC_SERIAL1_CTRL, f_sync, on) | - IO_STATE(R_SYNC_SERIAL1_CTRL, clk_mode, normal) | - IO_STATE(R_SYNC_SERIAL1_CTRL, clk_halt, stopped) | - IO_STATE(R_SYNC_SERIAL1_CTRL, bitorder, msb) | - IO_STATE(R_SYNC_SERIAL1_CTRL, tr_enable, disable) | - IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit) | - IO_STATE(R_SYNC_SERIAL1_CTRL, buf_empty, lmt_8) | - IO_STATE(R_SYNC_SERIAL1_CTRL, buf_full, lmt_8) | - IO_STATE(R_SYNC_SERIAL1_CTRL, flow_ctrl, enabled) | - IO_STATE(R_SYNC_SERIAL1_CTRL, clk_polarity, neg) | - IO_STATE(R_SYNC_SERIAL1_CTRL, frame_polarity, normal)| - IO_STATE(R_SYNC_SERIAL1_CTRL, status_polarity, inverted)| - IO_STATE(R_SYNC_SERIAL1_CTRL, clk_driver, normal) | - IO_STATE(R_SYNC_SERIAL1_CTRL, frame_driver, normal) | - IO_STATE(R_SYNC_SERIAL1_CTRL, status_driver, normal)| - IO_STATE(R_SYNC_SERIAL1_CTRL, def_out0, high); - - if (port->use_dma) - port->ctrl_data_shadow |= IO_STATE(R_SYNC_SERIAL1_CTRL, - dma_enable, on); - else - port->ctrl_data_shadow |= IO_STATE(R_SYNC_SERIAL1_CTRL, - dma_enable, off); - - *port->ctrl_data = port->ctrl_data_shadow; -} - -static inline int sync_data_avail(struct sync_port *port) -{ - int avail; - unsigned char *start; - unsigned char *end; - - start = (unsigned char *)port->readp; /* cast away volatile */ - end = (unsigned char *)port->writep; /* cast away volatile */ - /* 0123456789 0123456789 - * ----- - ----- - * ^rp ^wp ^wp ^rp - */ - if (end >= start) - avail = end - start; - else - avail = port->in_buffer_size - (start - end); - return avail; -} - -static inline int sync_data_avail_to_end(struct sync_port *port) -{ - int avail; - unsigned char *start; - unsigned char *end; - - start = (unsigned char *)port->readp; /* cast away volatile */ - end = (unsigned char *)port->writep; /* cast away volatile */ - /* 0123456789 0123456789 - * ----- ----- - * ^rp ^wp ^wp ^rp - */ - - if (end >= start) - avail = end - start; - else - avail = port->flip + port->in_buffer_size - start; - return avail; -} - - -static int sync_serial_open(struct inode *inode, struct file *file) -{ - int dev = MINOR(inode->i_rdev); - struct sync_port *port; - int mode; - int err = -EBUSY; - - mutex_lock(&sync_serial_mutex); - DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev)); - - if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) { - DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); - err = -ENODEV; - goto out; - } - port = &ports[dev]; - /* Allow open this device twice (assuming one reader and one writer) */ - if (port->busy == 2) { - DEBUG(printk(KERN_DEBUG "Device is busy.. \n")); - goto out; - } - if (port->init_irqs) { - if (port->use_dma) { - if (port == &ports[0]) { -#ifdef SYNC_SER_DMA - if (request_irq(24, tr_interrupt, 0, - "synchronous serial 1 dma tr", - &ports[0])) { - printk(KERN_CRIT "Can't alloc " - "sync serial port 1 IRQ"); - goto out; - } else if (request_irq(25, rx_interrupt, 0, - "synchronous serial 1 dma rx", - &ports[0])) { - free_irq(24, &port[0]); - printk(KERN_CRIT "Can't alloc " - "sync serial port 1 IRQ"); - goto out; - } else if (cris_request_dma(8, - "synchronous serial 1 dma tr", - DMA_VERBOSE_ON_ERROR, - dma_ser1)) { - free_irq(24, &port[0]); - free_irq(25, &port[0]); - printk(KERN_CRIT "Can't alloc " - "sync serial port 1 " - "TX DMA channel"); - goto out; - } else if (cris_request_dma(9, - "synchronous serial 1 dma rec", - DMA_VERBOSE_ON_ERROR, - dma_ser1)) { - cris_free_dma(8, NULL); - free_irq(24, &port[0]); - free_irq(25, &port[0]); - printk(KERN_CRIT "Can't alloc " - "sync serial port 1 " - "RX DMA channel"); - goto out; - } -#endif - RESET_DMA(8); WAIT_DMA(8); - RESET_DMA(9); WAIT_DMA(9); - *R_DMA_CH8_CLR_INTR = - IO_STATE(R_DMA_CH8_CLR_INTR, clr_eop, - do) | - IO_STATE(R_DMA_CH8_CLR_INTR, clr_descr, - do); - *R_DMA_CH9_CLR_INTR = - IO_STATE(R_DMA_CH9_CLR_INTR, clr_eop, - do) | - IO_STATE(R_DMA_CH9_CLR_INTR, clr_descr, - do); - *R_IRQ_MASK2_SET = - IO_STATE(R_IRQ_MASK2_SET, dma8_eop, - set) | - IO_STATE(R_IRQ_MASK2_SET, dma9_descr, - set); - } else if (port == &ports[1]) { -#ifdef SYNC_SER_DMA - if (request_irq(20, tr_interrupt, 0, - "synchronous serial 3 dma tr", - &ports[1])) { - printk(KERN_CRIT "Can't alloc " - "sync serial port 3 IRQ"); - goto out; - } else if (request_irq(21, rx_interrupt, 0, - "synchronous serial 3 dma rx", - &ports[1])) { - free_irq(20, &ports[1]); - printk(KERN_CRIT "Can't alloc " - "sync serial port 3 IRQ"); - goto out; - } else if (cris_request_dma(4, - "synchronous serial 3 dma tr", - DMA_VERBOSE_ON_ERROR, - dma_ser3)) { - free_irq(21, &ports[1]); - free_irq(20, &ports[1]); - printk(KERN_CRIT "Can't alloc " - "sync serial port 3 " - "TX DMA channel"); - goto out; - } else if (cris_request_dma(5, - "synchronous serial 3 dma rec", - DMA_VERBOSE_ON_ERROR, - dma_ser3)) { - cris_free_dma(4, NULL); - free_irq(21, &ports[1]); - free_irq(20, &ports[1]); - printk(KERN_CRIT "Can't alloc " - "sync serial port 3 " - "RX DMA channel"); - goto out; - } -#endif - RESET_DMA(4); WAIT_DMA(4); - RESET_DMA(5); WAIT_DMA(5); - *R_DMA_CH4_CLR_INTR = - IO_STATE(R_DMA_CH4_CLR_INTR, clr_eop, - do) | - IO_STATE(R_DMA_CH4_CLR_INTR, clr_descr, - do); - *R_DMA_CH5_CLR_INTR = - IO_STATE(R_DMA_CH5_CLR_INTR, clr_eop, - do) | - IO_STATE(R_DMA_CH5_CLR_INTR, clr_descr, - do); - *R_IRQ_MASK2_SET = - IO_STATE(R_IRQ_MASK2_SET, dma4_eop, - set) | - IO_STATE(R_IRQ_MASK2_SET, dma5_descr, - set); - } - start_dma_in(port); - port->init_irqs = 0; - } else { /* !port->use_dma */ -#ifdef SYNC_SER_MANUAL - if (port == &ports[0]) { - if (request_irq(8, - manual_interrupt, - IRQF_SHARED, - "synchronous serial manual irq", - &ports[0])) { - printk(KERN_CRIT "Can't alloc " - "sync serial manual irq"); - goto out; - } - } else if (port == &ports[1]) { - if (request_irq(8, - manual_interrupt, - IRQF_SHARED, - "synchronous serial manual irq", - &ports[1])) { - printk(KERN_CRIT "Can't alloc " - "sync serial manual irq"); - goto out; - } - } - port->init_irqs = 0; -#else - panic("sync_serial: Manual mode not supported.\n"); -#endif /* SYNC_SER_MANUAL */ - } - } /* port->init_irqs */ - - port->busy++; - /* Start port if we use it as input */ - mode = IO_EXTRACT(R_SYNC_SERIAL1_CTRL, mode, port->ctrl_data_shadow); - if (mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, master_input) || - mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, slave_input) || - mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, master_bidir) || - mode == IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, mode, slave_bidir)) { - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt, - running); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable, - enable); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable, - enable); - port->started = 1; - *port->ctrl_data = port->ctrl_data_shadow; - if (!port->use_dma) - *R_IRQ_MASK1_SET = 1 << port->data_avail_bit; - DEBUG(printk(KERN_DEBUG "sser%d rec started\n", dev)); - } - err = 0; - -out: - mutex_unlock(&sync_serial_mutex); - return err; -} - -static int sync_serial_release(struct inode *inode, struct file *file) -{ - int dev = MINOR(inode->i_rdev); - struct sync_port *port; - - if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) { - DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); - return -ENODEV; - } - port = &ports[dev]; - if (port->busy) - port->busy--; - if (!port->busy) - *R_IRQ_MASK1_CLR = ((1 << port->data_avail_bit) | - (1 << port->transmitter_ready_bit)); - - return 0; -} - - - -static __poll_t sync_serial_poll(struct file *file, poll_table *wait) -{ - int dev = MINOR(file_inode(file)->i_rdev); - __poll_t mask = 0; - struct sync_port *port; - DEBUGPOLL(static __poll_t prev_mask = 0); - - port = &ports[dev]; - poll_wait(file, &port->out_wait_q, wait); - poll_wait(file, &port->in_wait_q, wait); - /* Some room to write */ - if (port->out_count < OUT_BUFFER_SIZE) - mask |= EPOLLOUT | EPOLLWRNORM; - /* At least an inbufchunk of data */ - if (sync_data_avail(port) >= port->inbufchunk) - mask |= EPOLLIN | EPOLLRDNORM; - - DEBUGPOLL(if (mask != prev_mask) - printk(KERN_DEBUG "sync_serial_poll: mask 0x%08X %s %s\n", - mask, - mask & EPOLLOUT ? "POLLOUT" : "", - mask & EPOLLIN ? "POLLIN" : ""); - prev_mask = mask; - ); - return mask; -} - -static int sync_serial_ioctl_unlocked(struct file *file, - unsigned int cmd, unsigned long arg) -{ - int return_val = 0; - unsigned long flags; - - int dev = MINOR(file_inode(file)->i_rdev); - struct sync_port *port; - - if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) { - DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); - return -1; - } - port = &ports[dev]; - - local_irq_save(flags); - /* Disable port while changing config */ - if (dev) { - if (port->use_dma) { - RESET_DMA(4); WAIT_DMA(4); - port->tr_running = 0; - port->out_count = 0; - port->outp = port->out_buffer; - *R_DMA_CH4_CLR_INTR = - IO_STATE(R_DMA_CH4_CLR_INTR, clr_eop, do) | - IO_STATE(R_DMA_CH4_CLR_INTR, clr_descr, do); - } - SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, async); - } else { - if (port->use_dma) { - RESET_DMA(8); WAIT_DMA(8); - port->tr_running = 0; - port->out_count = 0; - port->outp = port->out_buffer; - *R_DMA_CH8_CLR_INTR = - IO_STATE(R_DMA_CH8_CLR_INTR, clr_eop, do) | - IO_STATE(R_DMA_CH8_CLR_INTR, clr_descr, do); - } - SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, async); - } - *R_GEN_CONFIG_II = gen_config_ii_shadow; - local_irq_restore(flags); - - switch (cmd) { - case SSP_SPEED: - if (GET_SPEED(arg) == CODEC) { - if (dev) - SETS(sync_serial_prescale_shadow, - R_SYNC_SERIAL_PRESCALE, clk_sel_u3, - codec); - else - SETS(sync_serial_prescale_shadow, - R_SYNC_SERIAL_PRESCALE, clk_sel_u1, - codec); - - SETF(sync_serial_prescale_shadow, - R_SYNC_SERIAL_PRESCALE, prescaler, - GET_FREQ(arg)); - SETF(sync_serial_prescale_shadow, - R_SYNC_SERIAL_PRESCALE, frame_rate, - GET_FRAME_RATE(arg)); - SETF(sync_serial_prescale_shadow, - R_SYNC_SERIAL_PRESCALE, word_rate, - GET_WORD_RATE(arg)); - } else { - SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - tr_baud, GET_SPEED(arg)); - if (dev) - SETS(sync_serial_prescale_shadow, - R_SYNC_SERIAL_PRESCALE, clk_sel_u3, - baudrate); - else - SETS(sync_serial_prescale_shadow, - R_SYNC_SERIAL_PRESCALE, clk_sel_u1, - baudrate); - } - break; - case SSP_MODE: - if (arg > 5) - return -EINVAL; - if (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT) - *R_IRQ_MASK1_CLR = 1 << port->data_avail_bit; - else if (!port->use_dma) - *R_IRQ_MASK1_SET = 1 << port->data_avail_bit; - SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, mode, arg); - break; - case SSP_FRAME_SYNC: - if (arg & NORMAL_SYNC) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - f_synctype, normal); - else if (arg & EARLY_SYNC) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - f_synctype, early); - - if (arg & BIT_SYNC) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - f_syncsize, bit); - else if (arg & WORD_SYNC) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - f_syncsize, word); - else if (arg & EXTENDED_SYNC) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - f_syncsize, extended); - - if (arg & SYNC_ON) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - f_sync, on); - else if (arg & SYNC_OFF) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - f_sync, off); - - if (arg & WORD_SIZE_8) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - wordsize, size8bit); - else if (arg & WORD_SIZE_12) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - wordsize, size12bit); - else if (arg & WORD_SIZE_16) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - wordsize, size16bit); - else if (arg & WORD_SIZE_24) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - wordsize, size24bit); - else if (arg & WORD_SIZE_32) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - wordsize, size32bit); - - if (arg & BIT_ORDER_MSB) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - bitorder, msb); - else if (arg & BIT_ORDER_LSB) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - bitorder, lsb); - - if (arg & FLOW_CONTROL_ENABLE) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - flow_ctrl, enabled); - else if (arg & FLOW_CONTROL_DISABLE) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - flow_ctrl, disabled); - - if (arg & CLOCK_NOT_GATED) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - clk_mode, normal); - else if (arg & CLOCK_GATED) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - clk_mode, gated); - - break; - case SSP_IPOLARITY: - /* NOTE!! negedge is considered NORMAL */ - if (arg & CLOCK_NORMAL) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - clk_polarity, neg); - else if (arg & CLOCK_INVERT) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - clk_polarity, pos); - - if (arg & FRAME_NORMAL) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - frame_polarity, normal); - else if (arg & FRAME_INVERT) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - frame_polarity, inverted); - - if (arg & STATUS_NORMAL) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - status_polarity, normal); - else if (arg & STATUS_INVERT) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - status_polarity, inverted); - break; - case SSP_OPOLARITY: - if (arg & CLOCK_NORMAL) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - clk_driver, normal); - else if (arg & CLOCK_INVERT) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - clk_driver, inverted); - - if (arg & FRAME_NORMAL) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - frame_driver, normal); - else if (arg & FRAME_INVERT) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - frame_driver, inverted); - - if (arg & STATUS_NORMAL) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - status_driver, normal); - else if (arg & STATUS_INVERT) - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - status_driver, inverted); - break; - case SSP_SPI: - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, flow_ctrl, - disabled); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, bitorder, - msb); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, wordsize, - size8bit); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_sync, on); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_syncsize, - word); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, f_synctype, - normal); - if (arg & SPI_SLAVE) { - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - frame_polarity, inverted); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - clk_polarity, neg); - SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - mode, SLAVE_INPUT); - } else { - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - frame_driver, inverted); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - clk_driver, inverted); - SETF(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, - mode, MASTER_OUTPUT); - } - break; - case SSP_INBUFCHUNK: -#if 0 - if (arg > port->in_buffer_size/NUM_IN_DESCR) - return -EINVAL; - port->inbufchunk = arg; - /* Make sure in_buffer_size is a multiple of inbufchunk */ - port->in_buffer_size = - (port->in_buffer_size/port->inbufchunk) * - port->inbufchunk; - DEBUG(printk(KERN_DEBUG "inbufchunk %i in_buffer_size: %i\n", - port->inbufchunk, port->in_buffer_size)); - if (port->use_dma) { - if (port->port_nbr == 0) { - RESET_DMA(9); - WAIT_DMA(9); - } else { - RESET_DMA(5); - WAIT_DMA(5); - } - start_dma_in(port); - } -#endif - break; - default: - return_val = -1; - } - /* Make sure we write the config without interruption */ - local_irq_save(flags); - /* Set config and enable port */ - *port->ctrl_data = port->ctrl_data_shadow; - nop(); nop(); nop(); nop(); - *R_SYNC_SERIAL_PRESCALE = sync_serial_prescale_shadow; - nop(); nop(); nop(); nop(); - if (dev) - SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode3, sync); - else - SETS(gen_config_ii_shadow, R_GEN_CONFIG_II, sermode1, sync); - - *R_GEN_CONFIG_II = gen_config_ii_shadow; - /* Reset DMA. At readout from serial port the data could be shifted - * one byte if not resetting DMA. - */ - if (port->use_dma) { - if (port->port_nbr == 0) { - RESET_DMA(9); - WAIT_DMA(9); - } else { - RESET_DMA(5); - WAIT_DMA(5); - } - start_dma_in(port); - } - local_irq_restore(flags); - return return_val; -} - -static long sync_serial_ioctl(struct file *file, - unsigned int cmd, unsigned long arg) -{ - long ret; - - mutex_lock(&sync_serial_mutex); - ret = sync_serial_ioctl_unlocked(file, cmd, arg); - mutex_unlock(&sync_serial_mutex); - - return ret; -} - - -static ssize_t sync_serial_write(struct file *file, const char *buf, - size_t count, loff_t *ppos) -{ - int dev = MINOR(file_inode(file)->i_rdev); - DECLARE_WAITQUEUE(wait, current); - struct sync_port *port; - unsigned long flags; - unsigned long c, c1; - unsigned long free_outp; - unsigned long outp; - unsigned long out_buffer; - - if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) { - DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); - return -ENODEV; - } - port = &ports[dev]; - - DEBUGWRITE(printk(KERN_DEBUG "W d%d c %lu (%d/%d)\n", - port->port_nbr, count, port->out_count, OUT_BUFFER_SIZE)); - /* Space to end of buffer */ - /* - * out_buffer <c1>012345<- c ->OUT_BUFFER_SIZE - * outp^ +out_count - * ^free_outp - * out_buffer 45<- c ->0123OUT_BUFFER_SIZE - * +out_count outp^ - * free_outp - * - */ - - /* Read variables that may be updated by interrupts */ - local_irq_save(flags); - if (count > OUT_BUFFER_SIZE - port->out_count) - count = OUT_BUFFER_SIZE - port->out_count; - - outp = (unsigned long)port->outp; - free_outp = outp + port->out_count; - local_irq_restore(flags); - out_buffer = (unsigned long)port->out_buffer; - - /* Find out where and how much to write */ - if (free_outp >= out_buffer + OUT_BUFFER_SIZE) - free_outp -= OUT_BUFFER_SIZE; - if (free_outp >= outp) - c = out_buffer + OUT_BUFFER_SIZE - free_outp; - else - c = outp - free_outp; - if (c > count) - c = count; - - DEBUGWRITE(printk(KERN_DEBUG "w op %08lX fop %08lX c %lu\n", - outp, free_outp, c)); - if (copy_from_user((void *)free_outp, buf, c)) - return -EFAULT; - - if (c != count) { - buf += c; - c1 = count - c; - DEBUGWRITE(printk(KERN_DEBUG "w2 fi %lu c %lu c1 %lu\n", - free_outp-out_buffer, c, c1)); - if (copy_from_user((void *)out_buffer, buf, c1)) - return -EFAULT; - } - local_irq_save(flags); - port->out_count += count; - local_irq_restore(flags); - - /* Make sure transmitter/receiver is running */ - if (!port->started) { - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt, - running); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable, - enable); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable, - enable); - port->started = 1; - } - - *port->ctrl_data = port->ctrl_data_shadow; - - if (file->f_flags & O_NONBLOCK) { - local_irq_save(flags); - if (!port->tr_running) { - if (!port->use_dma) { - /* Start sender by writing data */ - send_word(port); - /* and enable transmitter ready IRQ */ - *R_IRQ_MASK1_SET = 1 << - port->transmitter_ready_bit; - } else - start_dma(port, - (unsigned char *volatile)port->outp, c); - } - local_irq_restore(flags); - DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu NB\n", - port->port_nbr, count)); - return count; - } - - /* Sleep until all sent */ - add_wait_queue(&port->out_wait_q, &wait); - set_current_state(TASK_INTERRUPTIBLE); - local_irq_save(flags); - if (!port->tr_running) { - if (!port->use_dma) { - /* Start sender by writing data */ - send_word(port); - /* and enable transmitter ready IRQ */ - *R_IRQ_MASK1_SET = 1 << port->transmitter_ready_bit; - } else - start_dma(port, port->outp, c); - } - local_irq_restore(flags); - schedule(); - remove_wait_queue(&port->out_wait_q, &wait); - if (signal_pending(current)) - return -EINTR; - - DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n", port->port_nbr, count)); - return count; -} - -static ssize_t sync_serial_read(struct file *file, char *buf, - size_t count, loff_t *ppos) -{ - int dev = MINOR(file_inode(file)->i_rdev); - int avail; - struct sync_port *port; - unsigned char *start; - unsigned char *end; - unsigned long flags; - - if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled) { - DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev)); - return -ENODEV; - } - port = &ports[dev]; - - DEBUGREAD(printk(KERN_DEBUG "R%d c %d ri %lu wi %lu /%lu\n", - dev, count, port->readp - port->flip, - port->writep - port->flip, port->in_buffer_size)); - - if (!port->started) { - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, clk_halt, - running); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, tr_enable, - enable); - SETS(port->ctrl_data_shadow, R_SYNC_SERIAL1_CTRL, rec_enable, - enable); - port->started = 1; - } - *port->ctrl_data = port->ctrl_data_shadow; - - /* Calculate number of available bytes */ - /* Save pointers to avoid that they are modified by interrupt */ - local_irq_save(flags); - start = (unsigned char *)port->readp; /* cast away volatile */ - end = (unsigned char *)port->writep; /* cast away volatile */ - local_irq_restore(flags); - while (start == end && !port->full) { - /* No data */ - if (file->f_flags & O_NONBLOCK) - return -EAGAIN; - - wait_event_interruptible(port->in_wait_q, - !(start == end && !port->full)); - if (signal_pending(current)) - return -EINTR; - - local_irq_save(flags); - start = (unsigned char *)port->readp; /* cast away volatile */ - end = (unsigned char *)port->writep; /* cast away volatile */ - local_irq_restore(flags); - } - - /* Lazy read, never return wrapped data. */ - if (port->full) - avail = port->in_buffer_size; - else if (end > start) - avail = end - start; - else - avail = port->flip + port->in_buffer_size - start; - - count = count > avail ? avail : count; - if (copy_to_user(buf, start, count)) - return -EFAULT; - /* Disable interrupts while updating readp */ - local_irq_save(flags); - port->readp += count; - if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */ - port->readp = port->flip; - port->full = 0; - local_irq_restore(flags); - DEBUGREAD(printk(KERN_DEBUG "r %d\n", count)); - return count; -} - -static void send_word(struct sync_port *port) -{ - switch (IO_EXTRACT(R_SYNC_SERIAL1_CTRL, wordsize, - port->ctrl_data_shadow)) { - case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit): - port->out_count--; - *port->data_out = *port->outp++; - if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) - port->outp = port->out_buffer; - break; - case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size12bit): - { - int data = (*port->outp++) << 8; - data |= *port->outp++; - port->out_count -= 2; - *port->data_out = data; - if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) - port->outp = port->out_buffer; - break; - } - case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size16bit): - port->out_count -= 2; - *port->data_out = *(unsigned short *)port->outp; - port->outp += 2; - if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) - port->outp = port->out_buffer; - break; - case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size24bit): - port->out_count -= 3; - *port->data_out = *(unsigned int *)port->outp; - port->outp += 3; - if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) - port->outp = port->out_buffer; - break; - case IO_STATE_VALUE(R_SYNC_SERIAL1_CTRL, wordsize, size32bit): - port->out_count -= 4; - *port->data_out = *(unsigned int *)port->outp; - port->outp += 4; - if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) - port->outp = port->out_buffer; - break; - } -} - - -static void start_dma(struct sync_port *port, const char *data, int count) -{ - port->tr_running = 1; - port->out_descr.hw_len = 0; - port->out_descr.next = 0; - port->out_descr.ctrl = d_eol | d_eop; /* No d_wait to avoid glitches */ - port->out_descr.sw_len = count; - port->out_descr.buf = virt_to_phys(data); - port->out_descr.status = 0; - - *port->output_dma_first = virt_to_phys(&port->out_descr); - *port->output_dma_cmd = IO_STATE(R_DMA_CH0_CMD, cmd, start); - DEBUGTXINT(printk(KERN_DEBUG "dma %08lX c %d\n", - (unsigned long)data, count)); -} - -static void start_dma_in(struct sync_port *port) -{ - int i; - unsigned long buf; - port->writep = port->flip; - - if (port->writep > port->flip + port->in_buffer_size) { - panic("Offset too large in sync serial driver\n"); - return; - } - buf = virt_to_phys(port->in_buffer); - for (i = 0; i < NUM_IN_DESCR; i++) { - port->in_descr[i].sw_len = port->inbufchunk; - port->in_descr[i].ctrl = d_int; - port->in_descr[i].next = virt_to_phys(&port->in_descr[i+1]); - port->in_descr[i].buf = buf; - port->in_descr[i].hw_len = 0; - port->in_descr[i].status = 0; - port->in_descr[i].fifo_len = 0; - buf += port->inbufchunk; - prepare_rx_descriptor(&port->in_descr[i]); - } - /* Link the last descriptor to the first */ - port->in_descr[i-1].next = virt_to_phys(&port->in_descr[0]); - port->in_descr[i-1].ctrl |= d_eol; - port->next_rx_desc = &port->in_descr[0]; - port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR - 1]; - *port->input_dma_first = virt_to_phys(port->next_rx_desc); - *port->input_dma_cmd = IO_STATE(R_DMA_CH0_CMD, cmd, start); -} - -#ifdef SYNC_SER_DMA -static irqreturn_t tr_interrupt(int irq, void *dev_id) -{ - unsigned long ireg = *R_IRQ_MASK2_RD; - struct etrax_dma_descr *descr; - unsigned int sentl; - int handled = 0; - int i; - - for (i = 0; i < NUMBER_OF_PORTS; i++) { - struct sync_port *port = &ports[i]; - if (!port->enabled || !port->use_dma) - continue; - - /* IRQ active for the port? */ - if (!(ireg & (1 << port->output_dma_bit))) - continue; - - handled = 1; - - /* Clear IRQ */ - *port->output_dma_clr_irq = - IO_STATE(R_DMA_CH0_CLR_INTR, clr_eop, do) | - IO_STATE(R_DMA_CH0_CLR_INTR, clr_descr, do); - - descr = &port->out_descr; - if (!(descr->status & d_stop)) - sentl = descr->sw_len; - else - /* Otherwise find amount of data sent here */ - sentl = descr->hw_len; - - port->out_count -= sentl; - port->outp += sentl; - if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE) - port->outp = port->out_buffer; - if (port->out_count) { - int c = port->out_buffer + OUT_BUFFER_SIZE - port->outp; - if (c > port->out_count) - c = port->out_count; - DEBUGTXINT(printk(KERN_DEBUG - "tx_int DMAWRITE %i %i\n", sentl, c)); - start_dma(port, port->outp, c); - } else { - DEBUGTXINT(printk(KERN_DEBUG - "tx_int DMA stop %i\n", sentl)); - port->tr_running = 0; - } - /* wake up the waiting process */ - wake_up_interruptible(&port->out_wait_q); - } - return IRQ_RETVAL(handled); -} /* tr_interrupt */ - -static irqreturn_t rx_interrupt(int irq, void *dev_id) -{ - unsigned long ireg = *R_IRQ_MASK2_RD; - int i; - int handled = 0; - - for (i = 0; i < NUMBER_OF_PORTS; i++) { - struct sync_port *port = &ports[i]; - - if (!port->enabled || !port->use_dma) - continue; - - if (!(ireg & (1 << port->input_dma_descr_bit))) - continue; - - /* Descriptor interrupt */ - handled = 1; - while (*port->input_dma_descr != - virt_to_phys(port->next_rx_desc)) { - if (port->writep + port->inbufchunk > port->flip + - port->in_buffer_size) { - int first_size = port->flip + - port->in_buffer_size - port->writep; - memcpy(port->writep, - phys_to_virt(port->next_rx_desc->buf), - first_size); - memcpy(port->flip, - phys_to_virt(port->next_rx_desc->buf + - first_size), - port->inbufchunk - first_size); - port->writep = port->flip + - port->inbufchunk - first_size; - } else { - memcpy(port->writep, - phys_to_virt(port->next_rx_desc->buf), - port->inbufchunk); - port->writep += port->inbufchunk; - if (port->writep >= port->flip - + port->in_buffer_size) - port->writep = port->flip; - } - if (port->writep == port->readp) - port->full = 1; - prepare_rx_descriptor(port->next_rx_desc); - port->next_rx_desc->ctrl |= d_eol; - port->prev_rx_desc->ctrl &= ~d_eol; - port->prev_rx_desc = phys_to_virt((unsigned) - port->next_rx_desc); - port->next_rx_desc = phys_to_virt((unsigned) - port->next_rx_desc->next); - /* Wake up the waiting process */ - wake_up_interruptible(&port->in_wait_q); - *port->input_dma_cmd = IO_STATE(R_DMA_CH1_CMD, - cmd, restart); - /* DMA has reached end of descriptor */ - *port->input_dma_clr_irq = IO_STATE(R_DMA_CH0_CLR_INTR, - clr_descr, do); - } - } - return IRQ_RETVAL(handled); -} /* rx_interrupt */ -#endif /* SYNC_SER_DMA */ - -#ifdef SYNC_SER_MANUAL -static irqreturn_t manual_interrupt(int irq, void *dev_id) -{ - int i; - int handled = 0; - - for (i = 0; i < NUMBER_OF_PORTS; i++) { - struct sync_port *port = &ports[i]; - - if (!port->enabled || port->use_dma) - continue; - - /* Data received? */ - if (*R_IRQ_MASK1_RD & (1 << port->data_avail_bit)) { - handled = 1; - /* Read data */ - switch (port->ctrl_data_shadow & - IO_MASK(R_SYNC_SERIAL1_CTRL, wordsize)) { - case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size8bit): - *port->writep++ = - *(volatile char *)port->data_in; - break; - case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size12bit): - { - int data = *(unsigned short *)port->data_in; - *port->writep = (data & 0x0ff0) >> 4; - *(port->writep + 1) = data & 0x0f; - port->writep += 2; - break; - } - case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size16bit): - *(unsigned short *)port->writep = - *(volatile unsigned short *)port->data_in; - port->writep += 2; - break; - case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size24bit): - *(unsigned int *)port->writep = *port->data_in; - port->writep += 3; - break; - case IO_STATE(R_SYNC_SERIAL1_CTRL, wordsize, size32bit): - *(unsigned int *)port->writep = *port->data_in; - port->writep += 4; - break; - } - - /* Wrap? */ - if (port->writep >= port->flip + port->in_buffer_size) - port->writep = port->flip; - if (port->writep == port->readp) { - /* Receive buffer overrun, discard oldest */ - port->readp++; - /* Wrap? */ - if (port->readp >= port->flip + - port->in_buffer_size) - port->readp = port->flip; - } - if (sync_data_avail(port) >= port->inbufchunk) { - /* Wake up application */ - wake_up_interruptible(&port->in_wait_q); - } - } - - /* Transmitter ready? */ - if (*R_IRQ_MASK1_RD & (1 << port->transmitter_ready_bit)) { - if (port->out_count > 0) { - /* More data to send */ - send_word(port); - } else { - /* Transmission finished */ - /* Turn off IRQ */ - *R_IRQ_MASK1_CLR = 1 << - port->transmitter_ready_bit; - /* Wake up application */ - wake_up_interruptible(&port->out_wait_q); - } - } - } - return IRQ_RETVAL(handled); -} -#endif - -module_init(etrax_sync_serial_init); |