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author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2009-02-21 21:42:50 +0000 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-02-21 21:42:50 +0000 |
commit | 22b61a11fd4e6d7a48d694ce350331bebc0394ed (patch) | |
tree | f4be46c8154f5094c248fcd9fdf644b236f591b3 /arch/arm/kernel | |
parent | 423145a5d4def58cff760809d48cfb21316d59a9 (diff) | |
parent | fa4e998999322bc1b11d2c8b19b9fa2016fd1548 (diff) | |
download | op-kernel-dev-22b61a11fd4e6d7a48d694ce350331bebc0394ed.zip op-kernel-dev-22b61a11fd4e6d7a48d694ce350331bebc0394ed.tar.gz |
Merge branch 'dma' into devel
Conflicts:
arch/arm/plat-mxc/dma-mx1-mx2.c
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r-- | arch/arm/kernel/dma-isa.c | 67 | ||||
-rw-r--r-- | arch/arm/kernel/dma.c | 119 |
2 files changed, 101 insertions, 85 deletions
diff --git a/arch/arm/kernel/dma-isa.c b/arch/arm/kernel/dma-isa.c index 4a3a504..0e88e46 100644 --- a/arch/arm/kernel/dma-isa.c +++ b/arch/arm/kernel/dma-isa.c @@ -24,11 +24,6 @@ #include <asm/dma.h> #include <asm/mach/dma.h> -#define ISA_DMA_MODE_READ 0x44 -#define ISA_DMA_MODE_WRITE 0x48 -#define ISA_DMA_MODE_CASCADE 0xc0 -#define ISA_DMA_AUTOINIT 0x10 - #define ISA_DMA_MASK 0 #define ISA_DMA_MODE 1 #define ISA_DMA_CLRFF 2 @@ -49,38 +44,35 @@ static unsigned int isa_dma_port[8][7] = { { 0xd4, 0xd6, 0xd8, 0x48a, 0x08a, 0xcc, 0xce } }; -static int isa_get_dma_residue(dmach_t channel, dma_t *dma) +static int isa_get_dma_residue(unsigned int chan, dma_t *dma) { - unsigned int io_port = isa_dma_port[channel][ISA_DMA_COUNT]; + unsigned int io_port = isa_dma_port[chan][ISA_DMA_COUNT]; int count; count = 1 + inb(io_port); count |= inb(io_port) << 8; - return channel < 4 ? count : (count << 1); + return chan < 4 ? count : (count << 1); } -static void isa_enable_dma(dmach_t channel, dma_t *dma) +static void isa_enable_dma(unsigned int chan, dma_t *dma) { if (dma->invalid) { unsigned long address, length; unsigned int mode; enum dma_data_direction direction; - mode = channel & 3; + mode = (chan & 3) | dma->dma_mode; switch (dma->dma_mode & DMA_MODE_MASK) { case DMA_MODE_READ: - mode |= ISA_DMA_MODE_READ; direction = DMA_FROM_DEVICE; break; case DMA_MODE_WRITE: - mode |= ISA_DMA_MODE_WRITE; direction = DMA_TO_DEVICE; break; case DMA_MODE_CASCADE: - mode |= ISA_DMA_MODE_CASCADE; direction = DMA_BIDIRECTIONAL; break; @@ -105,34 +97,31 @@ static void isa_enable_dma(dmach_t channel, dma_t *dma) address = dma->buf.dma_address; length = dma->buf.length - 1; - outb(address >> 16, isa_dma_port[channel][ISA_DMA_PGLO]); - outb(address >> 24, isa_dma_port[channel][ISA_DMA_PGHI]); + outb(address >> 16, isa_dma_port[chan][ISA_DMA_PGLO]); + outb(address >> 24, isa_dma_port[chan][ISA_DMA_PGHI]); - if (channel >= 4) { + if (chan >= 4) { address >>= 1; length >>= 1; } - outb(0, isa_dma_port[channel][ISA_DMA_CLRFF]); - - outb(address, isa_dma_port[channel][ISA_DMA_ADDR]); - outb(address >> 8, isa_dma_port[channel][ISA_DMA_ADDR]); + outb(0, isa_dma_port[chan][ISA_DMA_CLRFF]); - outb(length, isa_dma_port[channel][ISA_DMA_COUNT]); - outb(length >> 8, isa_dma_port[channel][ISA_DMA_COUNT]); + outb(address, isa_dma_port[chan][ISA_DMA_ADDR]); + outb(address >> 8, isa_dma_port[chan][ISA_DMA_ADDR]); - if (dma->dma_mode & DMA_AUTOINIT) - mode |= ISA_DMA_AUTOINIT; + outb(length, isa_dma_port[chan][ISA_DMA_COUNT]); + outb(length >> 8, isa_dma_port[chan][ISA_DMA_COUNT]); - outb(mode, isa_dma_port[channel][ISA_DMA_MODE]); + outb(mode, isa_dma_port[chan][ISA_DMA_MODE]); dma->invalid = 0; } - outb(channel & 3, isa_dma_port[channel][ISA_DMA_MASK]); + outb(chan & 3, isa_dma_port[chan][ISA_DMA_MASK]); } -static void isa_disable_dma(dmach_t channel, dma_t *dma) +static void isa_disable_dma(unsigned int chan, dma_t *dma) { - outb(channel | 4, isa_dma_port[channel][ISA_DMA_MASK]); + outb(chan | 4, isa_dma_port[chan][ISA_DMA_MASK]); } static struct dma_ops isa_dma_ops = { @@ -160,7 +149,12 @@ static struct resource dma_resources[] = { { .end = 0x048f } }; -void __init isa_init_dma(dma_t *dma) +static dma_t isa_dma[8]; + +/* + * ISA DMA always starts at channel 0 + */ +void __init isa_init_dma(void) { /* * Try to autodetect presence of an ISA DMA controller. @@ -178,11 +172,11 @@ void __init isa_init_dma(dma_t *dma) outb(0xaa, 0x00); if (inb(0) == 0x55 && inb(0) == 0xaa) { - int channel, i; + unsigned int chan, i; - for (channel = 0; channel < 8; channel++) { - dma[channel].d_ops = &isa_dma_ops; - isa_disable_dma(channel, NULL); + for (chan = 0; chan < 8; chan++) { + isa_dma[chan].d_ops = &isa_dma_ops; + isa_disable_dma(chan, NULL); } outb(0x40, 0x0b); @@ -217,5 +211,12 @@ void __init isa_init_dma(dma_t *dma) for (i = 0; i < ARRAY_SIZE(dma_resources); i++) request_resource(&ioport_resource, dma_resources + i); + + for (chan = 0; chan < 8; chan++) { + int ret = isa_dma_add(chan, &isa_dma[chan]); + if (ret) + printk(KERN_ERR "ISADMA%u: unable to register: %d\n", + chan, ret); + } } } diff --git a/arch/arm/kernel/dma.c b/arch/arm/kernel/dma.c index d006085..7d5b9fb 100644 --- a/arch/arm/kernel/dma.c +++ b/arch/arm/kernel/dma.c @@ -15,6 +15,7 @@ #include <linux/init.h> #include <linux/spinlock.h> #include <linux/errno.h> +#include <linux/scatterlist.h> #include <asm/dma.h> @@ -23,19 +24,40 @@ DEFINE_SPINLOCK(dma_spin_lock); EXPORT_SYMBOL(dma_spin_lock); -static dma_t dma_chan[MAX_DMA_CHANNELS]; +static dma_t *dma_chan[MAX_DMA_CHANNELS]; + +static inline dma_t *dma_channel(unsigned int chan) +{ + if (chan >= MAX_DMA_CHANNELS) + return NULL; + + return dma_chan[chan]; +} + +int __init isa_dma_add(unsigned int chan, dma_t *dma) +{ + if (!dma->d_ops) + return -EINVAL; + + sg_init_table(&dma->buf, 1); + + if (dma_chan[chan]) + return -EBUSY; + dma_chan[chan] = dma; + return 0; +} /* * Request DMA channel * * On certain platforms, we have to allocate an interrupt as well... */ -int request_dma(dmach_t channel, const char *device_id) +int request_dma(unsigned int chan, const char *device_id) { - dma_t *dma = dma_chan + channel; + dma_t *dma = dma_channel(chan); int ret; - if (channel >= MAX_DMA_CHANNELS || !dma->d_ops) + if (!dma) goto bad_dma; if (xchg(&dma->lock, 1) != 0) @@ -47,7 +69,7 @@ int request_dma(dmach_t channel, const char *device_id) ret = 0; if (dma->d_ops->request) - ret = dma->d_ops->request(channel, dma); + ret = dma->d_ops->request(chan, dma); if (ret) xchg(&dma->lock, 0); @@ -55,7 +77,7 @@ int request_dma(dmach_t channel, const char *device_id) return ret; bad_dma: - printk(KERN_ERR "dma: trying to allocate DMA%d\n", channel); + printk(KERN_ERR "dma: trying to allocate DMA%d\n", chan); return -EINVAL; busy: @@ -68,42 +90,42 @@ EXPORT_SYMBOL(request_dma); * * On certain platforms, we have to free interrupt as well... */ -void free_dma(dmach_t channel) +void free_dma(unsigned int chan) { - dma_t *dma = dma_chan + channel; + dma_t *dma = dma_channel(chan); - if (channel >= MAX_DMA_CHANNELS || !dma->d_ops) + if (!dma) goto bad_dma; if (dma->active) { - printk(KERN_ERR "dma%d: freeing active DMA\n", channel); - dma->d_ops->disable(channel, dma); + printk(KERN_ERR "dma%d: freeing active DMA\n", chan); + dma->d_ops->disable(chan, dma); dma->active = 0; } if (xchg(&dma->lock, 0) != 0) { if (dma->d_ops->free) - dma->d_ops->free(channel, dma); + dma->d_ops->free(chan, dma); return; } - printk(KERN_ERR "dma%d: trying to free free DMA\n", channel); + printk(KERN_ERR "dma%d: trying to free free DMA\n", chan); return; bad_dma: - printk(KERN_ERR "dma: trying to free DMA%d\n", channel); + printk(KERN_ERR "dma: trying to free DMA%d\n", chan); } EXPORT_SYMBOL(free_dma); /* Set DMA Scatter-Gather list */ -void set_dma_sg (dmach_t channel, struct scatterlist *sg, int nr_sg) +void set_dma_sg (unsigned int chan, struct scatterlist *sg, int nr_sg) { - dma_t *dma = dma_chan + channel; + dma_t *dma = dma_channel(chan); if (dma->active) printk(KERN_ERR "dma%d: altering DMA SG while " - "DMA active\n", channel); + "DMA active\n", chan); dma->sg = sg; dma->sgcount = nr_sg; @@ -115,13 +137,13 @@ EXPORT_SYMBOL(set_dma_sg); * * Copy address to the structure, and set the invalid bit */ -void __set_dma_addr (dmach_t channel, void *addr) +void __set_dma_addr (unsigned int chan, void *addr) { - dma_t *dma = dma_chan + channel; + dma_t *dma = dma_channel(chan); if (dma->active) printk(KERN_ERR "dma%d: altering DMA address while " - "DMA active\n", channel); + "DMA active\n", chan); dma->sg = NULL; dma->addr = addr; @@ -133,13 +155,13 @@ EXPORT_SYMBOL(__set_dma_addr); * * Copy address to the structure, and set the invalid bit */ -void set_dma_count (dmach_t channel, unsigned long count) +void set_dma_count (unsigned int chan, unsigned long count) { - dma_t *dma = dma_chan + channel; + dma_t *dma = dma_channel(chan); if (dma->active) printk(KERN_ERR "dma%d: altering DMA count while " - "DMA active\n", channel); + "DMA active\n", chan); dma->sg = NULL; dma->count = count; @@ -149,13 +171,13 @@ EXPORT_SYMBOL(set_dma_count); /* Set DMA direction mode */ -void set_dma_mode (dmach_t channel, dmamode_t mode) +void set_dma_mode (unsigned int chan, unsigned int mode) { - dma_t *dma = dma_chan + channel; + dma_t *dma = dma_channel(chan); if (dma->active) printk(KERN_ERR "dma%d: altering DMA mode while " - "DMA active\n", channel); + "DMA active\n", chan); dma->dma_mode = mode; dma->invalid = 1; @@ -164,42 +186,42 @@ EXPORT_SYMBOL(set_dma_mode); /* Enable DMA channel */ -void enable_dma (dmach_t channel) +void enable_dma (unsigned int chan) { - dma_t *dma = dma_chan + channel; + dma_t *dma = dma_channel(chan); if (!dma->lock) goto free_dma; if (dma->active == 0) { dma->active = 1; - dma->d_ops->enable(channel, dma); + dma->d_ops->enable(chan, dma); } return; free_dma: - printk(KERN_ERR "dma%d: trying to enable free DMA\n", channel); + printk(KERN_ERR "dma%d: trying to enable free DMA\n", chan); BUG(); } EXPORT_SYMBOL(enable_dma); /* Disable DMA channel */ -void disable_dma (dmach_t channel) +void disable_dma (unsigned int chan) { - dma_t *dma = dma_chan + channel; + dma_t *dma = dma_channel(chan); if (!dma->lock) goto free_dma; if (dma->active == 1) { dma->active = 0; - dma->d_ops->disable(channel, dma); + dma->d_ops->disable(chan, dma); } return; free_dma: - printk(KERN_ERR "dma%d: trying to disable free DMA\n", channel); + printk(KERN_ERR "dma%d: trying to disable free DMA\n", chan); BUG(); } EXPORT_SYMBOL(disable_dma); @@ -207,45 +229,38 @@ EXPORT_SYMBOL(disable_dma); /* * Is the specified DMA channel active? */ -int dma_channel_active(dmach_t channel) +int dma_channel_active(unsigned int chan) { - return dma_chan[channel].active; + dma_t *dma = dma_channel(chan); + return dma->active; } EXPORT_SYMBOL(dma_channel_active); -void set_dma_page(dmach_t channel, char pagenr) +void set_dma_page(unsigned int chan, char pagenr) { - printk(KERN_ERR "dma%d: trying to set_dma_page\n", channel); + printk(KERN_ERR "dma%d: trying to set_dma_page\n", chan); } EXPORT_SYMBOL(set_dma_page); -void set_dma_speed(dmach_t channel, int cycle_ns) +void set_dma_speed(unsigned int chan, int cycle_ns) { - dma_t *dma = dma_chan + channel; + dma_t *dma = dma_channel(chan); int ret = 0; if (dma->d_ops->setspeed) - ret = dma->d_ops->setspeed(channel, dma, cycle_ns); + ret = dma->d_ops->setspeed(chan, dma, cycle_ns); dma->speed = ret; } EXPORT_SYMBOL(set_dma_speed); -int get_dma_residue(dmach_t channel) +int get_dma_residue(unsigned int chan) { - dma_t *dma = dma_chan + channel; + dma_t *dma = dma_channel(chan); int ret = 0; if (dma->d_ops->residue) - ret = dma->d_ops->residue(channel, dma); + ret = dma->d_ops->residue(chan, dma); return ret; } EXPORT_SYMBOL(get_dma_residue); - -static int __init init_dma(void) -{ - arch_dma_init(dma_chan); - return 0; -} - -core_initcall(init_dma); |