diff options
| -rw-r--r-- | sound/sparc/dbri.c | 205 |
1 files changed, 103 insertions, 102 deletions
diff --git a/sound/sparc/dbri.c b/sound/sparc/dbri.c index a56f81b..b5c4c15 100644 --- a/sound/sparc/dbri.c +++ b/sound/sparc/dbri.c @@ -1,6 +1,6 @@ /* * Driver for DBRI sound chip found on Sparcs. - * Copyright (C) 2004 Martin Habets (mhabets@users.sourceforge.net) + * Copyright (C) 2004, 2005 Martin Habets (mhabets@users.sourceforge.net) * * Based entirely upon drivers/sbus/audio/dbri.c which is: * Copyright (C) 1997 Rudolf Koenig (rfkoenig@immd4.informatik.uni-erlangen.de) @@ -43,6 +43,12 @@ * audio devices. But the SUN HW group decided against it, at least on my * LX the speakerbox connector has at least 1 pin missing and 1 wrongly * connected. + * + * I've tried to stick to the following function naming conventions: + * snd_* ALSA stuff + * cs4215_* CS4215 codec specfic stuff + * dbri_* DBRI high-level stuff + * other DBRI low-level stuff */ #include <sound/driver.h> @@ -87,7 +93,7 @@ MODULE_PARM_DESC(enable, "Enable Sun DBRI soundcard."); #define D_DESC (1<<5) static int dbri_debug = 0; -module_param(dbri_debug, int, 0444); +module_param(dbri_debug, int, 0644); MODULE_PARM_DESC(dbri_debug, "Debug value for Sun DBRI soundcard."); #ifdef DBRI_DEBUG @@ -320,7 +326,8 @@ typedef struct snd_dbri { void __iomem *regs; /* dbri HW regs */ int dbri_version; /* 'e' and up is OK */ int dbri_irqp; /* intr queue pointer */ - int wait_seen; + int wait_send; /* sequence of command buffers send */ + int wait_ackd; /* sequence of command buffers acknowledged */ struct dbri_pipe pipes[DBRI_NO_PIPES]; /* DBRI's 32 data pipes */ struct dbri_desc descs[DBRI_NO_DESCS]; @@ -625,16 +632,13 @@ static __u32 reverse_bytes(__u32 b, int len) Commands are sent to the DBRI by building a list of them in memory, then writing the address of the first list item to DBRI register 8. -The list is terminated with a WAIT command, which can generate a -CPU interrupt if required. +The list is terminated with a WAIT command, which generates a +CPU interrupt to signal completion. Since the DBRI can run in parallel with the CPU, several means of -synchronization present themselves. The original scheme (Rudolf's) -was to set a flag when we "cmdlock"ed the DBRI, clear the flag when -an interrupt signaled completion, and wait on a wait_queue if a routine -attempted to cmdlock while the flag was set. The problems arose when -we tried to cmdlock from inside an interrupt handler, which might -cause scheduling in an interrupt (if we waited), etc, etc +synchronization present themselves. The method implemented here is close +to the original scheme (Rudolf's), and uses 2 counters (wait_send and +wait_ackd) to synchronize the command buffer between the CPU and the DBRI. A more sophisticated scheme might involve a circular command buffer or an array of command buffers. A routine could fill one with @@ -642,70 +646,75 @@ commands and link it onto a list. When a interrupt signaled completion of the current command buffer, look on the list for the next one. -I've decided to implement something much simpler - after each command, -the CPU waits for the DBRI to finish the command by polling the P bit -in DBRI register 0. I've tried to implement this in such a way -that might make implementing a more sophisticated scheme easier. - Every time a routine wants to write commands to the DBRI, it must first call dbri_cmdlock() and get an initial pointer into dbri->dma->cmd -in return. After the commands have been writen, dbri_cmdsend() is -called with the final pointer value. +in return. dbri_cmdlock() will block if the previous commands have not +been completed yet. After this the commands can be written to the buffer, +and dbri_cmdsend() is called with the final pointer value to send them +to the DBRI. */ +static void dbri_process_interrupt_buffer(snd_dbri_t * dbri); + enum dbri_lock_t { NoGetLock, GetLock }; +#define MAXLOOPS 10 static volatile s32 *dbri_cmdlock(snd_dbri_t * dbri, enum dbri_lock_t get) { + int maxloops = MAXLOOPS; + #ifndef SMP if ((get == GetLock) && spin_is_locked(&dbri->lock)) { printk(KERN_ERR "DBRI: cmdlock called while in spinlock."); } #endif + /* Delay if previous commands are still being processed */ + while ((--maxloops) > 0 && (dbri->wait_send != dbri->wait_ackd)) { + msleep_interruptible(1); + /* If dbri_cmdlock() got called from inside the + * interrupt handler, this will do the processing. + */ + dbri_process_interrupt_buffer(dbri); + } + if (maxloops == 0) { + printk(KERN_ERR "DBRI: Chip never completed command buffer %d\n", + dbri->wait_send); + } else { + dprintk(D_CMD, "Chip completed command buffer (%d)\n", + MAXLOOPS - maxloops - 1); + } + /*if (get == GetLock) spin_lock(&dbri->lock); */ return &dbri->dma->cmd[0]; } -static void dbri_process_interrupt_buffer(snd_dbri_t *); - static void dbri_cmdsend(snd_dbri_t * dbri, volatile s32 * cmd) { - int MAXLOOPS = 1000000; - int maxloops = MAXLOOPS; volatile s32 *ptr; + u32 reg; for (ptr = &dbri->dma->cmd[0]; ptr < cmd; ptr++) { dprintk(D_CMD, "cmd: %lx:%08x\n", (unsigned long)ptr, *ptr); } if ((cmd - &dbri->dma->cmd[0]) >= DBRI_NO_CMDS - 1) { - printk("DBRI: Command buffer overflow! (bug in driver)\n"); + printk(KERN_ERR "DBRI: Command buffer overflow! (bug in driver)\n"); /* Ignore the last part. */ cmd = &dbri->dma->cmd[DBRI_NO_CMDS - 3]; } + dbri->wait_send++; + dbri->wait_send &= 0xffff; /* restrict it to a 16 bit counter. */ *(cmd++) = DBRI_CMD(D_PAUSE, 0, 0); - *(cmd++) = DBRI_CMD(D_WAIT, 1, 0); - dbri->wait_seen = 0; + *(cmd++) = DBRI_CMD(D_WAIT, 1, dbri->wait_send); + + /* Set command pointer and signal it is valid. */ sbus_writel(dbri->dma_dvma, dbri->regs + REG8); - while ((--maxloops) > 0 && (sbus_readl(dbri->regs + REG0) & D_P)) - barrier(); - if (maxloops == 0) { - printk(KERN_ERR "DBRI: Chip never completed command buffer\n"); - dprintk(D_CMD, "DBRI: Chip never completed command buffer\n"); - } else { - while ((--maxloops) > 0 && (!dbri->wait_seen)) - dbri_process_interrupt_buffer(dbri); - if (maxloops == 0) { - printk(KERN_ERR "DBRI: Chip never acked WAIT\n"); - dprintk(D_CMD, "DBRI: Chip never acked WAIT\n"); - } else { - dprintk(D_CMD, "Chip completed command " - "buffer (%d)\n", MAXLOOPS - maxloops); - } - } + reg = sbus_readl(dbri->regs + REG0); + reg |= D_P; + sbus_writel(reg, dbri->regs + REG0); /*spin_unlock(&dbri->lock); */ } @@ -757,10 +766,11 @@ static void dbri_initialize(snd_dbri_t * dbri) for (n = 0; n < DBRI_NO_PIPES; n++) dbri->pipes[n].desc = dbri->pipes[n].first_desc = -1; - /* We should query the openprom to see what burst sizes this - * SBus supports. For now, just disable all SBus bursts */ + /* A brute approach - DBRI falls back to working burst size by itself + * On SS20 D_S does not work, so do not try so high. */ tmp = sbus_readl(dbri->regs + REG0); - tmp &= ~(D_G | D_S | D_E); + tmp |= D_G | D_E; + tmp &= ~D_S; sbus_writel(tmp, dbri->regs + REG0); /* @@ -805,13 +815,13 @@ static void reset_pipe(snd_dbri_t * dbri, int pipe) volatile int *cmd; if (pipe < 0 || pipe > 31) { - printk("DBRI: reset_pipe called with illegal pipe number\n"); + printk(KERN_ERR "DBRI: reset_pipe called with illegal pipe number\n"); return; } sdp = dbri->pipes[pipe].sdp; if (sdp == 0) { - printk("DBRI: reset_pipe called on uninitialized pipe\n"); + printk(KERN_ERR "DBRI: reset_pipe called on uninitialized pipe\n"); return; } @@ -834,12 +844,12 @@ static void reset_pipe(snd_dbri_t * dbri, int pipe) static void setup_pipe(snd_dbri_t * dbri, int pipe, int sdp) { if (pipe < 0 || pipe > 31) { - printk("DBRI: setup_pipe called with illegal pipe number\n"); + printk(KERN_ERR "DBRI: setup_pipe called with illegal pipe number\n"); return; } if ((sdp & 0xf800) != sdp) { - printk("DBRI: setup_pipe called with strange SDP value\n"); + printk(KERN_ERR "DBRI: setup_pipe called with strange SDP value\n"); /* sdp &= 0xf800; */ } @@ -872,13 +882,13 @@ static void link_time_slot(snd_dbri_t * dbri, int pipe, int nextpipe; if (pipe < 0 || pipe > 31 || basepipe < 0 || basepipe > 31) { - printk - ("DBRI: link_time_slot called with illegal pipe number\n"); + printk(KERN_ERR + "DBRI: link_time_slot called with illegal pipe number\n"); return; } if (dbri->pipes[pipe].sdp == 0 || dbri->pipes[basepipe].sdp == 0) { - printk("DBRI: link_time_slot called on uninitialized pipe\n"); + printk(KERN_ERR "DBRI: link_time_slot called on uninitialized pipe\n"); return; } @@ -960,8 +970,8 @@ static void unlink_time_slot(snd_dbri_t * dbri, int pipe, int val; if (pipe < 0 || pipe > 31 || prevpipe < 0 || prevpipe > 31) { - printk - ("DBRI: unlink_time_slot called with illegal pipe number\n"); + printk(KERN_ERR + "DBRI: unlink_time_slot called with illegal pipe number\n"); return; } @@ -1001,22 +1011,22 @@ static void xmit_fixed(snd_dbri_t * dbri, int pipe, unsigned int data) volatile s32 *cmd; if (pipe < 16 || pipe > 31) { - printk("DBRI: xmit_fixed: Illegal pipe number\n"); + printk(KERN_ERR "DBRI: xmit_fixed: Illegal pipe number\n"); return; } if (D_SDP_MODE(dbri->pipes[pipe].sdp) == 0) { - printk("DBRI: xmit_fixed: Uninitialized pipe %d\n", pipe); + printk(KERN_ERR "DBRI: xmit_fixed: Uninitialized pipe %d\n", pipe); return; } if (D_SDP_MODE(dbri->pipes[pipe].sdp) != D_SDP_FIXED) { - printk("DBRI: xmit_fixed: Non-fixed pipe %d\n", pipe); + printk(KERN_ERR "DBRI: xmit_fixed: Non-fixed pipe %d\n", pipe); return; } if (!(dbri->pipes[pipe].sdp & D_SDP_TO_SER)) { - printk("DBRI: xmit_fixed: Called on receive pipe %d\n", pipe); + printk(KERN_ERR "DBRI: xmit_fixed: Called on receive pipe %d\n", pipe); return; } @@ -1036,17 +1046,17 @@ static void xmit_fixed(snd_dbri_t * dbri, int pipe, unsigned int data) static void recv_fixed(snd_dbri_t * dbri, int pipe, volatile __u32 * ptr) { if (pipe < 16 || pipe > 31) { - printk("DBRI: recv_fixed called with illegal pipe number\n"); + printk(KERN_ERR "DBRI: recv_fixed called with illegal pipe number\n"); return; } if (D_SDP_MODE(dbri->pipes[pipe].sdp) != D_SDP_FIXED) { - printk("DBRI: recv_fixed called on non-fixed pipe %d\n", pipe); + printk(KERN_ERR "DBRI: recv_fixed called on non-fixed pipe %d\n", pipe); return; } if (dbri->pipes[pipe].sdp & D_SDP_TO_SER) { - printk("DBRI: recv_fixed called on transmit pipe %d\n", pipe); + printk(KERN_ERR "DBRI: recv_fixed called on transmit pipe %d\n", pipe); return; } @@ -1075,12 +1085,12 @@ static int setup_descs(snd_dbri_t * dbri, int streamno, unsigned int period) int last_desc = -1; if (info->pipe < 0 || info->pipe > 15) { - printk("DBRI: setup_descs: Illegal pipe number\n"); + printk(KERN_ERR "DBRI: setup_descs: Illegal pipe number\n"); return -2; } if (dbri->pipes[info->pipe].sdp == 0) { - printk("DBRI: setup_descs: Uninitialized pipe %d\n", + printk(KERN_ERR "DBRI: setup_descs: Uninitialized pipe %d\n", info->pipe); return -2; } @@ -1090,20 +1100,20 @@ static int setup_descs(snd_dbri_t * dbri, int streamno, unsigned int period) if (streamno == DBRI_PLAY) { if (!(dbri->pipes[info->pipe].sdp & D_SDP_TO_SER)) { - printk("DBRI: setup_descs: Called on receive pipe %d\n", + printk(KERN_ERR "DBRI: setup_descs: Called on receive pipe %d\n", info->pipe); return -2; } } else { if (dbri->pipes[info->pipe].sdp & D_SDP_TO_SER) { - printk - ("DBRI: setup_descs: Called on transmit pipe %d\n", + printk(KERN_ERR + "DBRI: setup_descs: Called on transmit pipe %d\n", info->pipe); return -2; } /* Should be able to queue multiple buffers to receive on a pipe */ if (pipe_active(dbri, info->pipe)) { - printk("DBRI: recv_on_pipe: Called on active pipe %d\n", + printk(KERN_ERR "DBRI: recv_on_pipe: Called on active pipe %d\n", info->pipe); return -2; } @@ -1120,7 +1130,7 @@ static int setup_descs(snd_dbri_t * dbri, int streamno, unsigned int period) break; } if (desc == DBRI_NO_DESCS) { - printk("DBRI: setup_descs: No descriptors\n"); + printk(KERN_ERR "DBRI: setup_descs: No descriptors\n"); return -1; } @@ -1165,7 +1175,7 @@ static int setup_descs(snd_dbri_t * dbri, int streamno, unsigned int period) } if (first_desc == -1 || last_desc == -1) { - printk("DBRI: setup_descs: Not enough descriptors available\n"); + printk(KERN_ERR "DBRI: setup_descs: Not enough descriptors available\n"); return -1; } @@ -1270,7 +1280,7 @@ static void reset_chi(snd_dbri_t * dbri, enum master_or_slave master_or_slave, int divisor = 12288 / clockrate; if (divisor > 255 || divisor * clockrate != 12288) - printk("DBRI: illegal bits_per_frame in setup_chi\n"); + printk(KERN_ERR "DBRI: illegal bits_per_frame in setup_chi\n"); *(cmd++) = DBRI_CMD(D_CHI, 0, D_CHI_CHICM(divisor) | D_CHI_FD | D_CHI_BPF(bits_per_frame)); @@ -1474,7 +1484,6 @@ static int cs4215_setctrl(snd_dbri_t * dbri) /* Temporarily mute outputs, and wait 1/8000 sec (125 us) * to make sure this takes. This avoids clicking noises. */ - cs4215_setdata(dbri, 1); udelay(125); @@ -1530,8 +1539,8 @@ static int cs4215_setctrl(snd_dbri_t * dbri) tmp |= D_C; /* Enable CHI */ sbus_writel(tmp, dbri->regs + REG0); - for (i = 64; ((dbri->mm.status & 0xe4) != 0x20); --i) { - udelay(125); + for (i = 10; ((dbri->mm.status & 0xe4) != 0x20); --i) { + msleep_interruptible(1); } if (i == 0) { dprintk(D_MM, "CS4215 didn't respond to CLB (0x%02x)\n", @@ -1678,8 +1687,8 @@ buffer and calls dbri_process_one_interrupt() for each interrupt word. Complicated interrupts are handled by dedicated functions (which appear first in this file). Any pending interrupts can be serviced by calling dbri_process_interrupt_buffer(), which works even if the CPU's -interrupts are disabled. This function is used by dbri_cmdsend() -to make sure we're synced up with the chip after each command sequence, +interrupts are disabled. This function is used by dbri_cmdlock() +to make sure we're synced up with the chip before each command sequence, even if we're running cli'ed. */ @@ -1765,11 +1774,13 @@ DECLARE_TASKLET(xmit_descs_task, xmit_descs, 0); * Called by main interrupt handler when DBRI signals transmission complete * on a pipe (interrupt triggered by the B bit in a transmit descriptor). * - * Walks through the pipe's list of transmit buffer descriptors, releasing - * each one's DMA buffer (if present), flagging the descriptor available, - * and signaling its callback routine (if present), before proceeding - * to the next one. Stops when the first descriptor is found without + * Walks through the pipe's list of transmit buffer descriptors and marks + * them as available. Stops when the first descriptor is found without * TBC (Transmit Buffer Complete) set, or we've run through them all. + * + * The DMA buffers are not released, but re-used. Since the transmit buffer + * descriptors are not clobbered, they can be re-submitted as is. This is + * done by the xmit_descs() tasklet above since that could take longer. */ static void transmission_complete_intr(snd_dbri_t * dbri, int pipe) @@ -1885,7 +1896,11 @@ static void dbri_process_one_interrupt(snd_dbri_t * dbri, int x) } if (channel == D_INTR_CMD && command == D_WAIT) { - dbri->wait_seen++; + dbri->wait_ackd = val; + if (dbri->wait_send != val) { + printk(KERN_ERR "Processing wait command %d when %d was send.\n", + val, dbri->wait_send); + } return; } @@ -1994,8 +2009,7 @@ static irqreturn_t snd_dbri_interrupt(int irq, void *dev_id, * The only one I've seen is MRR, which will be triggered * if you let a transmit pipe underrun, then try to CDP it. * - * If these things persist, we should probably reset - * and re-init the chip. + * If these things persist, we reset the chip. */ if ((++errcnt) % 10 == 0) { dprintk(D_INT, "Interrupt errors exceeded.\n"); @@ -2094,7 +2108,7 @@ static int snd_dbri_hw_params(snd_pcm_substream_t * substream, if ((ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0) { - snd_printk(KERN_ERR "malloc_pages failed with %d\n", ret); + printk(KERN_ERR "malloc_pages failed with %d\n", ret); return ret; } @@ -2455,8 +2469,7 @@ static int __init snd_dbri_mixer(snd_dbri_t * dbri) for (idx = 0; idx < NUM_CS4215_CONTROLS; idx++) { if ((err = snd_ctl_add(card, - snd_ctl_new1(&dbri_controls[idx], - dbri))) < 0) + snd_ctl_new1(&dbri_controls[idx], dbri))) < 0) return err; } @@ -2490,8 +2503,6 @@ static void dbri_debug_read(snd_info_entry_t * entry, int pipe; snd_iprintf(buffer, "debug=%d\n", dbri_debug); - snd_iprintf(buffer, "CHI pipe in=%d, out=%d\n", - dbri->chi_in_pipe, dbri->chi_out_pipe); for (pipe = 0; pipe < 32; pipe++) { if (pipe_active(dbri, pipe)) { struct dbri_pipe *pptr = &dbri->pipes[pipe]; @@ -2506,18 +2517,6 @@ static void dbri_debug_read(snd_info_entry_t * entry, } } } - -static void dbri_debug_write(snd_info_entry_t * entry, - snd_info_buffer_t * buffer) -{ - char line[80]; - int i; - - if (snd_info_get_line(buffer, line, 80) == 0) { - sscanf(line, "%d\n", &i); - dbri_debug = i & 0x3f; - } -} #endif void snd_dbri_proc(snd_dbri_t * dbri) @@ -2531,9 +2530,7 @@ void snd_dbri_proc(snd_dbri_t * dbri) #ifdef DBRI_DEBUG err = snd_card_proc_new(dbri->card, "debug", &entry); snd_info_set_text_ops(entry, dbri, 4096, dbri_debug_read); - entry->mode = S_IFREG | S_IRUGO | S_IWUSR; /* Writable for root */ - entry->c.text.write_size = 256; - entry->c.text.write = dbri_debug_write; + entry->mode = S_IFREG | S_IRUGO; /* Readable only. */ #endif } @@ -2637,7 +2634,11 @@ static int __init dbri_attach(int prom_node, struct sbus_dev *sdev) return -ENOENT; } - prom_getproperty(prom_node, "intr", (char *)&irq, sizeof(irq)); + err = prom_getproperty(prom_node, "intr", (char *)&irq, sizeof(irq)); + if (err < 0) { + printk(KERN_ERR "DBRI-%d: Firmware node lacks IRQ property.\n", dev); + return -ENODEV; + } card = snd_card_new(index[dev], id[dev], THIS_MODULE, sizeof(snd_dbri_t)); |