11da177e4SLinus Torvalds /* 2c1017a4cSJaroslav Kysela * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 31da177e4SLinus Torvalds * Routines for control of MPU-401 in UART mode 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * MPU-401 supports UART mode which is not capable generate transmit 61da177e4SLinus Torvalds * interrupts thus output is done via polling. Also, if irq < 0, then 71da177e4SLinus Torvalds * input is done also via polling. Do not expect good performance. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 111da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 121da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 131da177e4SLinus Torvalds * (at your option) any later version. 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 161da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 171da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 181da177e4SLinus Torvalds * GNU General Public License for more details. 191da177e4SLinus Torvalds * 201da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 211da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 221da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 231da177e4SLinus Torvalds * 241da177e4SLinus Torvalds * 13-03-2003: 251da177e4SLinus Torvalds * Added support for different kind of hardware I/O. Build in choices 261da177e4SLinus Torvalds * are port and mmio. For other kind of I/O, set mpu->read and 271da177e4SLinus Torvalds * mpu->write to your own I/O functions. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds */ 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include <asm/io.h> 321da177e4SLinus Torvalds #include <linux/delay.h> 331da177e4SLinus Torvalds #include <linux/init.h> 341da177e4SLinus Torvalds #include <linux/slab.h> 351da177e4SLinus Torvalds #include <linux/ioport.h> 361da177e4SLinus Torvalds #include <linux/interrupt.h> 371da177e4SLinus Torvalds #include <linux/errno.h> 381da177e4SLinus Torvalds #include <sound/core.h> 391da177e4SLinus Torvalds #include <sound/mpu401.h> 401da177e4SLinus Torvalds 41c1017a4cSJaroslav Kysela MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 421da177e4SLinus Torvalds MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode"); 431da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 441da177e4SLinus Torvalds 45e1fad17bSTakashi Iwai static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu); 46e1fad17bSTakashi Iwai static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu); 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds /* 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds */ 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds #define snd_mpu401_input_avail(mpu) (!(mpu->read(mpu, MPU401C(mpu)) & 0x80)) 531da177e4SLinus Torvalds #define snd_mpu401_output_ready(mpu) (!(mpu->read(mpu, MPU401C(mpu)) & 0x40)) 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds #define MPU401_RESET 0xff 561da177e4SLinus Torvalds #define MPU401_ENTER_UART 0x3f 571da177e4SLinus Torvalds #define MPU401_ACK 0xfe 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds /* Build in lowlevel io */ 602851d963STakashi Iwai static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data, 612851d963STakashi Iwai unsigned long addr) 621da177e4SLinus Torvalds { 631da177e4SLinus Torvalds outb(data, addr); 641da177e4SLinus Torvalds } 651da177e4SLinus Torvalds 662851d963STakashi Iwai static unsigned char mpu401_read_port(struct snd_mpu401 *mpu, 672851d963STakashi Iwai unsigned long addr) 681da177e4SLinus Torvalds { 691da177e4SLinus Torvalds return inb(addr); 701da177e4SLinus Torvalds } 711da177e4SLinus Torvalds 722851d963STakashi Iwai static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data, 732851d963STakashi Iwai unsigned long addr) 741da177e4SLinus Torvalds { 751da177e4SLinus Torvalds writeb(data, (void __iomem *)addr); 761da177e4SLinus Torvalds } 771da177e4SLinus Torvalds 782851d963STakashi Iwai static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu, 792851d963STakashi Iwai unsigned long addr) 801da177e4SLinus Torvalds { 811da177e4SLinus Torvalds return readb((void __iomem *)addr); 821da177e4SLinus Torvalds } 831da177e4SLinus Torvalds /* */ 841da177e4SLinus Torvalds 85e1fad17bSTakashi Iwai static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu) 861da177e4SLinus Torvalds { 871da177e4SLinus Torvalds int timeout = 100000; 881da177e4SLinus Torvalds for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--) 891da177e4SLinus Torvalds mpu->read(mpu, MPU401D(mpu)); 901da177e4SLinus Torvalds #ifdef CONFIG_SND_DEBUG 911da177e4SLinus Torvalds if (timeout <= 0) 922851d963STakashi Iwai snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n", 932851d963STakashi Iwai mpu->read(mpu, MPU401C(mpu))); 941da177e4SLinus Torvalds #endif 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds 97302e4c2fSTakashi Iwai static void uart_interrupt_tx(struct snd_mpu401 *mpu) 981da177e4SLinus Torvalds { 9960fac85fSClemens Ladisch unsigned long flags; 10060fac85fSClemens Ladisch 1011da177e4SLinus Torvalds if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) && 1021da177e4SLinus Torvalds test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) { 10360fac85fSClemens Ladisch spin_lock_irqsave(&mpu->output_lock, flags); 1041da177e4SLinus Torvalds snd_mpu401_uart_output_write(mpu); 10560fac85fSClemens Ladisch spin_unlock_irqrestore(&mpu->output_lock, flags); 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 109302e4c2fSTakashi Iwai static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu) 110302e4c2fSTakashi Iwai { 11160fac85fSClemens Ladisch unsigned long flags; 11260fac85fSClemens Ladisch 113302e4c2fSTakashi Iwai if (mpu->info_flags & MPU401_INFO_INPUT) { 11460fac85fSClemens Ladisch spin_lock_irqsave(&mpu->input_lock, flags); 115302e4c2fSTakashi Iwai if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) 116302e4c2fSTakashi Iwai snd_mpu401_uart_input_read(mpu); 117302e4c2fSTakashi Iwai else 118302e4c2fSTakashi Iwai snd_mpu401_uart_clear_rx(mpu); 11960fac85fSClemens Ladisch spin_unlock_irqrestore(&mpu->input_lock, flags); 120302e4c2fSTakashi Iwai } 121302e4c2fSTakashi Iwai if (! (mpu->info_flags & MPU401_INFO_TX_IRQ)) 122302e4c2fSTakashi Iwai /* ok. for better Tx performance try do some output 123302e4c2fSTakashi Iwai when input is done */ 124302e4c2fSTakashi Iwai uart_interrupt_tx(mpu); 125302e4c2fSTakashi Iwai } 126302e4c2fSTakashi Iwai 1271da177e4SLinus Torvalds /** 1281da177e4SLinus Torvalds * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler 1291da177e4SLinus Torvalds * @irq: the irq number 1301da177e4SLinus Torvalds * @dev_id: mpu401 instance 1311da177e4SLinus Torvalds * 1321da177e4SLinus Torvalds * Processes the interrupt for MPU401-UART i/o. 1331da177e4SLinus Torvalds */ 1347d12e780SDavid Howells irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id) 1351da177e4SLinus Torvalds { 136e1fad17bSTakashi Iwai struct snd_mpu401 *mpu = dev_id; 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds if (mpu == NULL) 1391da177e4SLinus Torvalds return IRQ_NONE; 1401da177e4SLinus Torvalds _snd_mpu401_uart_interrupt(mpu); 1411da177e4SLinus Torvalds return IRQ_HANDLED; 1421da177e4SLinus Torvalds } 1431da177e4SLinus Torvalds 1442851d963STakashi Iwai EXPORT_SYMBOL(snd_mpu401_uart_interrupt); 1452851d963STakashi Iwai 146302e4c2fSTakashi Iwai /** 147302e4c2fSTakashi Iwai * snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler 148302e4c2fSTakashi Iwai * @irq: the irq number 149302e4c2fSTakashi Iwai * @dev_id: mpu401 instance 150302e4c2fSTakashi Iwai * 151302e4c2fSTakashi Iwai * Processes the interrupt for MPU401-UART output. 152302e4c2fSTakashi Iwai */ 1537d12e780SDavid Howells irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id) 154302e4c2fSTakashi Iwai { 155302e4c2fSTakashi Iwai struct snd_mpu401 *mpu = dev_id; 156302e4c2fSTakashi Iwai 157302e4c2fSTakashi Iwai if (mpu == NULL) 158302e4c2fSTakashi Iwai return IRQ_NONE; 159302e4c2fSTakashi Iwai uart_interrupt_tx(mpu); 160302e4c2fSTakashi Iwai return IRQ_HANDLED; 161302e4c2fSTakashi Iwai } 162302e4c2fSTakashi Iwai 163302e4c2fSTakashi Iwai EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx); 164302e4c2fSTakashi Iwai 1651da177e4SLinus Torvalds /* 1661da177e4SLinus Torvalds * timer callback 1671da177e4SLinus Torvalds * reprogram the timer and call the interrupt job 1681da177e4SLinus Torvalds */ 1691da177e4SLinus Torvalds static void snd_mpu401_uart_timer(unsigned long data) 1701da177e4SLinus Torvalds { 171e1fad17bSTakashi Iwai struct snd_mpu401 *mpu = (struct snd_mpu401 *)data; 172b32425acSTakashi Iwai unsigned long flags; 1731da177e4SLinus Torvalds 174b32425acSTakashi Iwai spin_lock_irqsave(&mpu->timer_lock, flags); 1751da177e4SLinus Torvalds /*mpu->mode |= MPU401_MODE_TIMER;*/ 1761da177e4SLinus Torvalds mpu->timer.expires = 1 + jiffies; 1771da177e4SLinus Torvalds add_timer(&mpu->timer); 178b32425acSTakashi Iwai spin_unlock_irqrestore(&mpu->timer_lock, flags); 1791da177e4SLinus Torvalds if (mpu->rmidi) 1801da177e4SLinus Torvalds _snd_mpu401_uart_interrupt(mpu); 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds /* 1841da177e4SLinus Torvalds * initialize the timer callback if not programmed yet 1851da177e4SLinus Torvalds */ 186e1fad17bSTakashi Iwai static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input) 1871da177e4SLinus Torvalds { 1881da177e4SLinus Torvalds unsigned long flags; 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds spin_lock_irqsave (&mpu->timer_lock, flags); 1911da177e4SLinus Torvalds if (mpu->timer_invoked == 0) { 1921da177e4SLinus Torvalds init_timer(&mpu->timer); 1931da177e4SLinus Torvalds mpu->timer.data = (unsigned long)mpu; 1941da177e4SLinus Torvalds mpu->timer.function = snd_mpu401_uart_timer; 1951da177e4SLinus Torvalds mpu->timer.expires = 1 + jiffies; 1961da177e4SLinus Torvalds add_timer(&mpu->timer); 1971da177e4SLinus Torvalds } 1982851d963STakashi Iwai mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER : 1992851d963STakashi Iwai MPU401_MODE_OUTPUT_TIMER; 2001da177e4SLinus Torvalds spin_unlock_irqrestore (&mpu->timer_lock, flags); 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* 2041da177e4SLinus Torvalds * remove the timer callback if still active 2051da177e4SLinus Torvalds */ 206e1fad17bSTakashi Iwai static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input) 2071da177e4SLinus Torvalds { 2081da177e4SLinus Torvalds unsigned long flags; 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds spin_lock_irqsave (&mpu->timer_lock, flags); 2111da177e4SLinus Torvalds if (mpu->timer_invoked) { 2122851d963STakashi Iwai mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER : 2132851d963STakashi Iwai ~MPU401_MODE_OUTPUT_TIMER; 2141da177e4SLinus Torvalds if (! mpu->timer_invoked) 2151da177e4SLinus Torvalds del_timer(&mpu->timer); 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds spin_unlock_irqrestore (&mpu->timer_lock, flags); 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds /* 2212851d963STakashi Iwai * send a UART command 2222851d963STakashi Iwai * return zero if successful, non-zero for some errors 2231da177e4SLinus Torvalds */ 2241da177e4SLinus Torvalds 225962f831fSJon Masters static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd, 226962f831fSJon Masters int ack) 2271da177e4SLinus Torvalds { 2281da177e4SLinus Torvalds unsigned long flags; 2291da177e4SLinus Torvalds int timeout, ok; 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds spin_lock_irqsave(&mpu->input_lock, flags); 2321da177e4SLinus Torvalds if (mpu->hardware != MPU401_HW_TRID4DWAVE) { 2331da177e4SLinus Torvalds mpu->write(mpu, 0x00, MPU401D(mpu)); 2341da177e4SLinus Torvalds /*snd_mpu401_uart_clear_rx(mpu);*/ 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds /* ok. standard MPU-401 initialization */ 2371da177e4SLinus Torvalds if (mpu->hardware != MPU401_HW_SB) { 2382851d963STakashi Iwai for (timeout = 1000; timeout > 0 && 2392851d963STakashi Iwai !snd_mpu401_output_ready(mpu); timeout--) 2401da177e4SLinus Torvalds udelay(10); 2411da177e4SLinus Torvalds #ifdef CONFIG_SND_DEBUG 2421da177e4SLinus Torvalds if (!timeout) 2432851d963STakashi Iwai snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n", 2442851d963STakashi Iwai mpu->read(mpu, MPU401C(mpu))); 2451da177e4SLinus Torvalds #endif 2461da177e4SLinus Torvalds } 2471da177e4SLinus Torvalds mpu->write(mpu, cmd, MPU401C(mpu)); 2481da177e4SLinus Torvalds if (ack) { 2491da177e4SLinus Torvalds ok = 0; 2501da177e4SLinus Torvalds timeout = 10000; 2511da177e4SLinus Torvalds while (!ok && timeout-- > 0) { 2521da177e4SLinus Torvalds if (snd_mpu401_input_avail(mpu)) { 2531da177e4SLinus Torvalds if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK) 2541da177e4SLinus Torvalds ok = 1; 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds } 2571da177e4SLinus Torvalds if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK) 2581da177e4SLinus Torvalds ok = 1; 2592851d963STakashi Iwai } else 2601da177e4SLinus Torvalds ok = 1; 2611da177e4SLinus Torvalds spin_unlock_irqrestore(&mpu->input_lock, flags); 262962f831fSJon Masters if (!ok) { 2632851d963STakashi Iwai snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx " 2642851d963STakashi Iwai "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port, 2652851d963STakashi Iwai mpu->read(mpu, MPU401C(mpu)), 2662851d963STakashi Iwai mpu->read(mpu, MPU401D(mpu))); 267962f831fSJon Masters return 1; 268962f831fSJon Masters } 269962f831fSJon Masters return 0; 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 2728f7ba051STakashi Iwai static int snd_mpu401_do_reset(struct snd_mpu401 *mpu) 2738f7ba051STakashi Iwai { 2748f7ba051STakashi Iwai if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1)) 2758f7ba051STakashi Iwai return -EIO; 276c1099fcbSClemens Ladisch if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0)) 2778f7ba051STakashi Iwai return -EIO; 2788f7ba051STakashi Iwai return 0; 2798f7ba051STakashi Iwai } 2808f7ba051STakashi Iwai 2811da177e4SLinus Torvalds /* 2821da177e4SLinus Torvalds * input/output open/close - protected by open_mutex in rawmidi.c 2831da177e4SLinus Torvalds */ 284e1fad17bSTakashi Iwai static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream) 2851da177e4SLinus Torvalds { 286e1fad17bSTakashi Iwai struct snd_mpu401 *mpu; 2871da177e4SLinus Torvalds int err; 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds mpu = substream->rmidi->private_data; 2901da177e4SLinus Torvalds if (mpu->open_input && (err = mpu->open_input(mpu)) < 0) 2911da177e4SLinus Torvalds return err; 2921da177e4SLinus Torvalds if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) { 2938f7ba051STakashi Iwai if (snd_mpu401_do_reset(mpu) < 0) 294962f831fSJon Masters goto error_out; 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds mpu->substream_input = substream; 2971da177e4SLinus Torvalds set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode); 2981da177e4SLinus Torvalds return 0; 299962f831fSJon Masters 300962f831fSJon Masters error_out: 301962f831fSJon Masters if (mpu->open_input && mpu->close_input) 302962f831fSJon Masters mpu->close_input(mpu); 303962f831fSJon Masters return -EIO; 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds 306e1fad17bSTakashi Iwai static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream) 3071da177e4SLinus Torvalds { 308e1fad17bSTakashi Iwai struct snd_mpu401 *mpu; 3091da177e4SLinus Torvalds int err; 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds mpu = substream->rmidi->private_data; 3121da177e4SLinus Torvalds if (mpu->open_output && (err = mpu->open_output(mpu)) < 0) 3131da177e4SLinus Torvalds return err; 3141da177e4SLinus Torvalds if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) { 3158f7ba051STakashi Iwai if (snd_mpu401_do_reset(mpu) < 0) 316962f831fSJon Masters goto error_out; 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds mpu->substream_output = substream; 3191da177e4SLinus Torvalds set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode); 3201da177e4SLinus Torvalds return 0; 321962f831fSJon Masters 322962f831fSJon Masters error_out: 323962f831fSJon Masters if (mpu->open_output && mpu->close_output) 324962f831fSJon Masters mpu->close_output(mpu); 325962f831fSJon Masters return -EIO; 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds 328e1fad17bSTakashi Iwai static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream) 3291da177e4SLinus Torvalds { 330e1fad17bSTakashi Iwai struct snd_mpu401 *mpu; 331962f831fSJon Masters int err = 0; 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds mpu = substream->rmidi->private_data; 3341da177e4SLinus Torvalds clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode); 3351da177e4SLinus Torvalds mpu->substream_input = NULL; 3361da177e4SLinus Torvalds if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) 337962f831fSJon Masters err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0); 3381da177e4SLinus Torvalds if (mpu->close_input) 3391da177e4SLinus Torvalds mpu->close_input(mpu); 340962f831fSJon Masters if (err) 341962f831fSJon Masters return -EIO; 3421da177e4SLinus Torvalds return 0; 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds 345e1fad17bSTakashi Iwai static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream) 3461da177e4SLinus Torvalds { 347e1fad17bSTakashi Iwai struct snd_mpu401 *mpu; 348962f831fSJon Masters int err = 0; 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds mpu = substream->rmidi->private_data; 3511da177e4SLinus Torvalds clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode); 3521da177e4SLinus Torvalds mpu->substream_output = NULL; 3531da177e4SLinus Torvalds if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) 354962f831fSJon Masters err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0); 3551da177e4SLinus Torvalds if (mpu->close_output) 3561da177e4SLinus Torvalds mpu->close_output(mpu); 357962f831fSJon Masters if (err) 358962f831fSJon Masters return -EIO; 3591da177e4SLinus Torvalds return 0; 3601da177e4SLinus Torvalds } 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds /* 3631da177e4SLinus Torvalds * trigger input callback 3641da177e4SLinus Torvalds */ 3652851d963STakashi Iwai static void 3662851d963STakashi Iwai snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up) 3671da177e4SLinus Torvalds { 3681da177e4SLinus Torvalds unsigned long flags; 369e1fad17bSTakashi Iwai struct snd_mpu401 *mpu; 3701da177e4SLinus Torvalds int max = 64; 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds mpu = substream->rmidi->private_data; 3731da177e4SLinus Torvalds if (up) { 3742851d963STakashi Iwai if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER, 3752851d963STakashi Iwai &mpu->mode)) { 3761da177e4SLinus Torvalds /* first time - flush FIFO */ 3771da177e4SLinus Torvalds while (max-- > 0) 3781da177e4SLinus Torvalds mpu->read(mpu, MPU401D(mpu)); 3791da177e4SLinus Torvalds if (mpu->irq < 0) 3801da177e4SLinus Torvalds snd_mpu401_uart_add_timer(mpu, 1); 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds /* read data in advance */ 3841da177e4SLinus Torvalds spin_lock_irqsave(&mpu->input_lock, flags); 3851da177e4SLinus Torvalds snd_mpu401_uart_input_read(mpu); 3861da177e4SLinus Torvalds spin_unlock_irqrestore(&mpu->input_lock, flags); 3871da177e4SLinus Torvalds } else { 3881da177e4SLinus Torvalds if (mpu->irq < 0) 3891da177e4SLinus Torvalds snd_mpu401_uart_remove_timer(mpu, 1); 3901da177e4SLinus Torvalds clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode); 3911da177e4SLinus Torvalds } 392962f831fSJon Masters 3931da177e4SLinus Torvalds } 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds /* 3961da177e4SLinus Torvalds * transfer input pending data 3971da177e4SLinus Torvalds * call with input_lock spinlock held 3981da177e4SLinus Torvalds */ 399e1fad17bSTakashi Iwai static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu) 4001da177e4SLinus Torvalds { 4011da177e4SLinus Torvalds int max = 128; 4021da177e4SLinus Torvalds unsigned char byte; 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds while (max-- > 0) { 4052851d963STakashi Iwai if (! snd_mpu401_input_avail(mpu)) 4062851d963STakashi Iwai break; /* input not available */ 4071da177e4SLinus Torvalds byte = mpu->read(mpu, MPU401D(mpu)); 4081da177e4SLinus Torvalds if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode)) 4091da177e4SLinus Torvalds snd_rawmidi_receive(mpu->substream_input, &byte, 1); 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds /* 4141da177e4SLinus Torvalds * Tx FIFO sizes: 4151da177e4SLinus Torvalds * CS4237B - 16 bytes 4161da177e4SLinus Torvalds * AudioDrive ES1688 - 12 bytes 4171da177e4SLinus Torvalds * S3 SonicVibes - 8 bytes 4181da177e4SLinus Torvalds * SoundBlaster AWE 64 - 2 bytes (ugly hardware) 4191da177e4SLinus Torvalds */ 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds /* 4221da177e4SLinus Torvalds * write output pending bytes 4231da177e4SLinus Torvalds * call with output_lock spinlock held 4241da177e4SLinus Torvalds */ 425e1fad17bSTakashi Iwai static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu) 4261da177e4SLinus Torvalds { 4271da177e4SLinus Torvalds unsigned char byte; 428ea6b5828SClemens Ladisch int max = 256; 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds do { 4312851d963STakashi Iwai if (snd_rawmidi_transmit_peek(mpu->substream_output, 4322851d963STakashi Iwai &byte, 1) == 1) { 433ea6b5828SClemens Ladisch /* 434ea6b5828SClemens Ladisch * Try twice because there is hardware that insists on 435ea6b5828SClemens Ladisch * setting the output busy bit after each write. 436ea6b5828SClemens Ladisch */ 437ea6b5828SClemens Ladisch if (!snd_mpu401_output_ready(mpu) && 438ea6b5828SClemens Ladisch !snd_mpu401_output_ready(mpu)) 4391da177e4SLinus Torvalds break; /* Tx FIFO full - try again later */ 4402851d963STakashi Iwai mpu->write(mpu, byte, MPU401D(mpu)); 4412851d963STakashi Iwai snd_rawmidi_transmit_ack(mpu->substream_output, 1); 4421da177e4SLinus Torvalds } else { 4431da177e4SLinus Torvalds snd_mpu401_uart_remove_timer (mpu, 0); 4441da177e4SLinus Torvalds break; /* no other data - leave the tx loop */ 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds } while (--max > 0); 4471da177e4SLinus Torvalds } 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds /* 4501da177e4SLinus Torvalds * output trigger callback 4511da177e4SLinus Torvalds */ 4522851d963STakashi Iwai static void 4532851d963STakashi Iwai snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up) 4541da177e4SLinus Torvalds { 4551da177e4SLinus Torvalds unsigned long flags; 456e1fad17bSTakashi Iwai struct snd_mpu401 *mpu; 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds mpu = substream->rmidi->private_data; 4591da177e4SLinus Torvalds if (up) { 4601da177e4SLinus Torvalds set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode); 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds /* try to add the timer at each output trigger, 4631da177e4SLinus Torvalds * since the output timer might have been removed in 4641da177e4SLinus Torvalds * snd_mpu401_uart_output_write(). 4651da177e4SLinus Torvalds */ 466302e4c2fSTakashi Iwai if (! (mpu->info_flags & MPU401_INFO_TX_IRQ)) 4671da177e4SLinus Torvalds snd_mpu401_uart_add_timer(mpu, 0); 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds /* output pending data */ 4701da177e4SLinus Torvalds spin_lock_irqsave(&mpu->output_lock, flags); 4711da177e4SLinus Torvalds snd_mpu401_uart_output_write(mpu); 4721da177e4SLinus Torvalds spin_unlock_irqrestore(&mpu->output_lock, flags); 4731da177e4SLinus Torvalds } else { 474302e4c2fSTakashi Iwai if (! (mpu->info_flags & MPU401_INFO_TX_IRQ)) 4751da177e4SLinus Torvalds snd_mpu401_uart_remove_timer(mpu, 0); 4761da177e4SLinus Torvalds clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode); 4771da177e4SLinus Torvalds } 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds /* 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds */ 4831da177e4SLinus Torvalds 484e1fad17bSTakashi Iwai static struct snd_rawmidi_ops snd_mpu401_uart_output = 4851da177e4SLinus Torvalds { 4861da177e4SLinus Torvalds .open = snd_mpu401_uart_output_open, 4871da177e4SLinus Torvalds .close = snd_mpu401_uart_output_close, 4881da177e4SLinus Torvalds .trigger = snd_mpu401_uart_output_trigger, 4891da177e4SLinus Torvalds }; 4901da177e4SLinus Torvalds 491e1fad17bSTakashi Iwai static struct snd_rawmidi_ops snd_mpu401_uart_input = 4921da177e4SLinus Torvalds { 4931da177e4SLinus Torvalds .open = snd_mpu401_uart_input_open, 4941da177e4SLinus Torvalds .close = snd_mpu401_uart_input_close, 4951da177e4SLinus Torvalds .trigger = snd_mpu401_uart_input_trigger, 4961da177e4SLinus Torvalds }; 4971da177e4SLinus Torvalds 498e1fad17bSTakashi Iwai static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi) 4991da177e4SLinus Torvalds { 500e1fad17bSTakashi Iwai struct snd_mpu401 *mpu = rmidi->private_data; 5011da177e4SLinus Torvalds if (mpu->irq_flags && mpu->irq >= 0) 5021da177e4SLinus Torvalds free_irq(mpu->irq, (void *) mpu); 503b1d5776dSTakashi Iwai release_and_free_resource(mpu->res); 5041da177e4SLinus Torvalds kfree(mpu); 5051da177e4SLinus Torvalds } 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds /** 5081da177e4SLinus Torvalds * snd_mpu401_uart_new - create an MPU401-UART instance 5091da177e4SLinus Torvalds * @card: the card instance 5101da177e4SLinus Torvalds * @device: the device index, zero-based 5111da177e4SLinus Torvalds * @hardware: the hardware type, MPU401_HW_XXXX 5121da177e4SLinus Torvalds * @port: the base address of MPU401 port 513302e4c2fSTakashi Iwai * @info_flags: bitflags MPU401_INFO_XXX 5141da177e4SLinus Torvalds * @irq: the irq number, -1 if no interrupt for mpu 5151da177e4SLinus Torvalds * @irq_flags: the irq request flags (SA_XXX), 0 if irq was already reserved. 5161da177e4SLinus Torvalds * @rrawmidi: the pointer to store the new rawmidi instance 5171da177e4SLinus Torvalds * 5181da177e4SLinus Torvalds * Creates a new MPU-401 instance. 5191da177e4SLinus Torvalds * 5201da177e4SLinus Torvalds * Note that the rawmidi instance is returned on the rrawmidi argument, 5211da177e4SLinus Torvalds * not the mpu401 instance itself. To access to the mpu401 instance, 522e1fad17bSTakashi Iwai * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast). 5231da177e4SLinus Torvalds * 5241da177e4SLinus Torvalds * Returns zero if successful, or a negative error code. 5251da177e4SLinus Torvalds */ 526e1fad17bSTakashi Iwai int snd_mpu401_uart_new(struct snd_card *card, int device, 5271da177e4SLinus Torvalds unsigned short hardware, 528302e4c2fSTakashi Iwai unsigned long port, 529302e4c2fSTakashi Iwai unsigned int info_flags, 5301da177e4SLinus Torvalds int irq, int irq_flags, 531e1fad17bSTakashi Iwai struct snd_rawmidi ** rrawmidi) 5321da177e4SLinus Torvalds { 533e1fad17bSTakashi Iwai struct snd_mpu401 *mpu; 534e1fad17bSTakashi Iwai struct snd_rawmidi *rmidi; 535302e4c2fSTakashi Iwai int in_enable, out_enable; 5361da177e4SLinus Torvalds int err; 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds if (rrawmidi) 5391da177e4SLinus Torvalds *rrawmidi = NULL; 540302e4c2fSTakashi Iwai if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT))) 541302e4c2fSTakashi Iwai info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT; 542302e4c2fSTakashi Iwai in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0; 543302e4c2fSTakashi Iwai out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0; 544302e4c2fSTakashi Iwai if ((err = snd_rawmidi_new(card, "MPU-401U", device, 545302e4c2fSTakashi Iwai out_enable, in_enable, &rmidi)) < 0) 5461da177e4SLinus Torvalds return err; 547561b220aSTakashi Iwai mpu = kzalloc(sizeof(*mpu), GFP_KERNEL); 5481da177e4SLinus Torvalds if (mpu == NULL) { 54973e77ba0STakashi Iwai snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n"); 5501da177e4SLinus Torvalds snd_device_free(card, rmidi); 5511da177e4SLinus Torvalds return -ENOMEM; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds rmidi->private_data = mpu; 5541da177e4SLinus Torvalds rmidi->private_free = snd_mpu401_uart_free; 5551da177e4SLinus Torvalds spin_lock_init(&mpu->input_lock); 5561da177e4SLinus Torvalds spin_lock_init(&mpu->output_lock); 5571da177e4SLinus Torvalds spin_lock_init(&mpu->timer_lock); 5581da177e4SLinus Torvalds mpu->hardware = hardware; 559302e4c2fSTakashi Iwai if (! (info_flags & MPU401_INFO_INTEGRATED)) { 5601da177e4SLinus Torvalds int res_size = hardware == MPU401_HW_PC98II ? 4 : 2; 5612851d963STakashi Iwai mpu->res = request_region(port, res_size, "MPU401 UART"); 5622851d963STakashi Iwai if (mpu->res == NULL) { 5632851d963STakashi Iwai snd_printk(KERN_ERR "mpu401_uart: " 5642851d963STakashi Iwai "unable to grab port 0x%lx size %d\n", 5652851d963STakashi Iwai port, res_size); 5661da177e4SLinus Torvalds snd_device_free(card, rmidi); 5671da177e4SLinus Torvalds return -EBUSY; 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds } 570302e4c2fSTakashi Iwai if (info_flags & MPU401_INFO_MMIO) { 5711da177e4SLinus Torvalds mpu->write = mpu401_write_mmio; 5721da177e4SLinus Torvalds mpu->read = mpu401_read_mmio; 573302e4c2fSTakashi Iwai } else { 5741da177e4SLinus Torvalds mpu->write = mpu401_write_port; 5751da177e4SLinus Torvalds mpu->read = mpu401_read_port; 5761da177e4SLinus Torvalds } 5771da177e4SLinus Torvalds mpu->port = port; 5781da177e4SLinus Torvalds if (hardware == MPU401_HW_PC98II) 5791da177e4SLinus Torvalds mpu->cport = port + 2; 5801da177e4SLinus Torvalds else 5811da177e4SLinus Torvalds mpu->cport = port + 1; 5821da177e4SLinus Torvalds if (irq >= 0 && irq_flags) { 5832851d963STakashi Iwai if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags, 5842851d963STakashi Iwai "MPU401 UART", (void *) mpu)) { 5852851d963STakashi Iwai snd_printk(KERN_ERR "mpu401_uart: " 5862851d963STakashi Iwai "unable to grab IRQ %d\n", irq); 5871da177e4SLinus Torvalds snd_device_free(card, rmidi); 5881da177e4SLinus Torvalds return -EBUSY; 5891da177e4SLinus Torvalds } 5901da177e4SLinus Torvalds } 591302e4c2fSTakashi Iwai mpu->info_flags = info_flags; 5921da177e4SLinus Torvalds mpu->irq = irq; 5931da177e4SLinus Torvalds mpu->irq_flags = irq_flags; 5941da177e4SLinus Torvalds if (card->shortname[0]) 5952851d963STakashi Iwai snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI", 5962851d963STakashi Iwai card->shortname); 5971da177e4SLinus Torvalds else 5981da177e4SLinus Torvalds sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device); 599302e4c2fSTakashi Iwai if (out_enable) { 6002851d963STakashi Iwai snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 6012851d963STakashi Iwai &snd_mpu401_uart_output); 602302e4c2fSTakashi Iwai rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; 603302e4c2fSTakashi Iwai } 604302e4c2fSTakashi Iwai if (in_enable) { 6052851d963STakashi Iwai snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 6062851d963STakashi Iwai &snd_mpu401_uart_input); 607302e4c2fSTakashi Iwai rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; 608302e4c2fSTakashi Iwai if (out_enable) 609302e4c2fSTakashi Iwai rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; 610302e4c2fSTakashi Iwai } 6111da177e4SLinus Torvalds mpu->rmidi = rmidi; 6121da177e4SLinus Torvalds if (rrawmidi) 6131da177e4SLinus Torvalds *rrawmidi = rmidi; 6141da177e4SLinus Torvalds return 0; 6151da177e4SLinus Torvalds } 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds EXPORT_SYMBOL(snd_mpu401_uart_new); 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds /* 6201da177e4SLinus Torvalds * INIT part 6211da177e4SLinus Torvalds */ 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds static int __init alsa_mpu401_uart_init(void) 6241da177e4SLinus Torvalds { 6251da177e4SLinus Torvalds return 0; 6261da177e4SLinus Torvalds } 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds static void __exit alsa_mpu401_uart_exit(void) 6291da177e4SLinus Torvalds { 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds module_init(alsa_mpu401_uart_init) 6331da177e4SLinus Torvalds module_exit(alsa_mpu401_uart_exit) 634