sh: SH7760 DMABRG support.
The DMABRG is a special DMA unit within the SH7760 which does data transfers from main memory to Audio units and USB shared memory. It has 3 IRQ lines which generate 10 events, which have to be masked unmasked and acked in a single 32bit register. It works independently from the tradition SH DMAC, but blocks usage of DMAC channel 0. This patch adds 2 functions to associate callbacks with DMABRG events and initialization. Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Manuel Lauss
Paul Mundt
parent
57be2b484a
commit
fc467a2623
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@ -2,8 +2,9 @@
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# Makefile for the Linux SuperH-specific device drivers.
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#
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obj-y += dma/
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obj-$(CONFIG_PCI) += pci/
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obj-$(CONFIG_SH_DMA) += dma/
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obj-$(CONFIG_SUPERHYWAY) += superhyway/
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obj-$(CONFIG_PUSH_SWITCH) += push-switch.o
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obj-$(CONFIG_HEARTBEAT) += heartbeat.o
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@ -1,12 +1,12 @@
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menu "DMA support"
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config SH_DMA
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bool "DMA controller (DMAC) support"
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help
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Selecting this option will provide same API as PC's Direct Memory
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Access Controller(8237A) for SuperH DMAC.
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config SH_DMA_API
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bool
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If unsure, say N.
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config SH_DMA
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bool "SuperH on-chip DMA controller (DMAC) support"
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select SH_DMA_API
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default n
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config NR_ONCHIP_DMA_CHANNELS
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depends on SH_DMA
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@ -53,4 +53,12 @@ config DMA_PAGE_OPS_CHANNEL
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in case channel 3 is unavailable. On the SH4, channels 1,2, and 3
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are dual-address capable.
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config SH_DMABRG
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bool "SH7760 DMABRG support"
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depends on CPU_SUBTYPE_SH7760
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help
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The DMABRG does data transfers from main memory to Audio/USB units
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of the SH7760.
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Say Y if you want to use Audio/USB DMA on your SH7760 board.
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endmenu
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@ -2,8 +2,8 @@
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# Makefile for the SuperH DMA specific kernel interface routines under Linux.
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#
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obj-y += dma-api.o
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obj-$(CONFIG_SH_DMA_API) += dma-api.o dma-sysfs.o
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obj-$(CONFIG_ISA_DMA_API) += dma-isa.o
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obj-$(CONFIG_SYSFS) += dma-sysfs.o
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obj-$(CONFIG_SH_DMA) += dma-sh.o
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obj-$(CONFIG_SH_DREAMCAST) += dma-pvr2.o dma-g2.o
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obj-$(CONFIG_SH_DMABRG) += dmabrg.o
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196
arch/sh/drivers/dma/dmabrg.c
Normal file
196
arch/sh/drivers/dma/dmabrg.c
Normal file
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@ -0,0 +1,196 @@
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/*
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* SH7760 DMABRG IRQ handling
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*
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* (c) 2007 MSC Vertriebsges.m.b.H, Manuel Lauss <mlau@msc-ge.com>
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* licensed under the GPLv2.
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*
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*/
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <asm/dma.h>
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#include <asm/dmabrg.h>
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#include <asm/io.h>
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/*
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* The DMABRG is a special DMA unit within the SH7760. It does transfers
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* from USB-SRAM/Audio units to main memory (and also the LCDC; but that
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* part is sensibly placed in the LCDC registers and requires no irqs)
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* It has 3 IRQ lines which trigger 10 events, and works independently
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* from the traditional SH DMAC (although it blocks usage of DMAC 0)
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*
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* BRGIRQID | component | dir | meaning | source
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* -----------------------------------------------------
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* 0 | USB-DMA | ... | xfer done | DMABRGI1
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* 1 | USB-UAE | ... | USB addr err.| DMABRGI0
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* 2 | HAC0/SSI0 | play| all done | DMABRGI1
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* 3 | HAC0/SSI0 | play| half done | DMABRGI2
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* 4 | HAC0/SSI0 | rec | all done | DMABRGI1
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* 5 | HAC0/SSI0 | rec | half done | DMABRGI2
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* 6 | HAC1/SSI1 | play| all done | DMABRGI1
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* 7 | HAC1/SSI1 | play| half done | DMABRGI2
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* 8 | HAC1/SSI1 | rec | all done | DMABRGI1
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* 9 | HAC1/SSI1 | rec | half done | DMABRGI2
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*
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* all can be enabled/disabled in the DMABRGCR register,
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* as well as checked if they occured.
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*
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* DMABRGI0 services USB DMA Address errors, but it still must be
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* enabled/acked in the DMABRGCR register. USB-DMA complete indicator
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* is grouped together with the audio buffer end indicators, too bad...
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*
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* DMABRGCR: Bits 31-24: audio-dma ENABLE flags,
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* Bits 23-16: audio-dma STATUS flags,
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* Bits 9-8: USB error/xfer ENABLE,
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* Bits 1-0: USB error/xfer STATUS.
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* Ack an IRQ by writing 0 to the STATUS flag.
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* Mask IRQ by writing 0 to ENABLE flag.
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*
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* Usage is almost like with any other IRQ:
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* dmabrg_request_irq(BRGIRQID, handler, data)
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* dmabrg_free_irq(BRGIRQID)
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*
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* handler prototype: void brgirqhandler(void *data)
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*/
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#define DMARSRA 0xfe090000
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#define DMAOR 0xffa00040
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#define DMACHCR0 0xffa0000c
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#define DMABRGCR 0xfe3c0000
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#define DMAOR_BRG 0x0000c000
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#define DMAOR_DMEN 0x00000001
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#define DMABRGI0 68
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#define DMABRGI1 69
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#define DMABRGI2 70
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struct dmabrg_handler {
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void (*handler)(void *);
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void *data;
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} *dmabrg_handlers;
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static inline void dmabrg_call_handler(int i)
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{
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dmabrg_handlers[i].handler(dmabrg_handlers[i].data);
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}
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/*
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* main DMABRG irq handler. It acks irqs and then
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* handles every set and unmasked bit sequentially.
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* No locking and no validity checks; it should be
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* as fast as possible (audio!)
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*/
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static irqreturn_t dmabrg_irq(int irq, void *data)
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{
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unsigned long dcr;
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unsigned int i;
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dcr = ctrl_inl(DMABRGCR);
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ctrl_outl(dcr & ~0x00ff0003, DMABRGCR); /* ack all */
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dcr &= dcr >> 8; /* ignore masked */
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/* USB stuff, get it out of the way first */
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if (dcr & 1)
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dmabrg_call_handler(DMABRGIRQ_USBDMA);
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if (dcr & 2)
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dmabrg_call_handler(DMABRGIRQ_USBDMAERR);
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/* Audio */
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dcr >>= 16;
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while (dcr) {
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i = __ffs(dcr);
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dcr &= dcr - 1;
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dmabrg_call_handler(i + DMABRGIRQ_A0TXF);
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}
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return IRQ_HANDLED;
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}
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static void dmabrg_disable_irq(unsigned int dmairq)
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{
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unsigned long dcr;
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dcr = ctrl_inl(DMABRGCR);
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dcr &= ~(1 << ((dmairq > 1) ? dmairq + 22 : dmairq + 8));
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ctrl_outl(dcr, DMABRGCR);
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}
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static void dmabrg_enable_irq(unsigned int dmairq)
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{
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unsigned long dcr;
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dcr = ctrl_inl(DMABRGCR);
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dcr |= (1 << ((dmairq > 1) ? dmairq + 22 : dmairq + 8));
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ctrl_outl(dcr, DMABRGCR);
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}
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int dmabrg_request_irq(unsigned int dmairq, void(*handler)(void*),
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void *data)
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{
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if ((dmairq > 9) || !handler)
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return -ENOENT;
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if (dmabrg_handlers[dmairq].handler)
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return -EBUSY;
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dmabrg_handlers[dmairq].handler = handler;
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dmabrg_handlers[dmairq].data = data;
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dmabrg_enable_irq(dmairq);
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return 0;
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}
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EXPORT_SYMBOL_GPL(dmabrg_request_irq);
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void dmabrg_free_irq(unsigned int dmairq)
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{
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if (likely(dmairq < 10)) {
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dmabrg_disable_irq(dmairq);
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dmabrg_handlers[dmairq].handler = NULL;
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dmabrg_handlers[dmairq].data = NULL;
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}
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}
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EXPORT_SYMBOL_GPL(dmabrg_free_irq);
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static int __init dmabrg_init(void)
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{
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unsigned long or;
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int ret;
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dmabrg_handlers = kzalloc(10 * sizeof(struct dmabrg_handler),
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GFP_KERNEL);
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if (!dmabrg_handlers)
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return -ENOMEM;
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#ifdef CONFIG_SH_DMA
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/* request DMAC channel 0 before anyone else can get it */
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ret = request_dma(0, "DMAC 0 (DMABRG)");
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if (ret < 0)
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printk(KERN_INFO "DMABRG: DMAC ch0 not reserved!\n");
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#endif
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ctrl_outl(0, DMABRGCR);
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ctrl_outl(0, DMACHCR0);
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ctrl_outl(0x94000000, DMARSRA); /* enable DMABRG in DMAC 0 */
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/* enable DMABRG mode, enable the DMAC */
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or = ctrl_inl(DMAOR);
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ctrl_outl(or | DMAOR_BRG | DMAOR_DMEN, DMAOR);
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ret = request_irq(DMABRGI0, dmabrg_irq, IRQF_DISABLED,
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"DMABRG USB address error", NULL);
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if (ret)
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goto out0;
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ret = request_irq(DMABRGI1, dmabrg_irq, IRQF_DISABLED,
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"DMABRG Transfer End", NULL);
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if (ret)
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goto out1;
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ret = request_irq(DMABRGI2, dmabrg_irq, IRQF_DISABLED,
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"DMABRG Transfer Half", NULL);
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if (ret == 0)
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return ret;
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free_irq(DMABRGI1, 0);
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out1: free_irq(DMABRGI0, 0);
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out0: kfree(dmabrg_handlers);
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return ret;
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}
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subsys_initcall(dmabrg_init);
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23
include/asm-sh/dmabrg.h
Normal file
23
include/asm-sh/dmabrg.h
Normal file
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@ -0,0 +1,23 @@
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/*
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* SH7760 DMABRG (USB/Audio) support
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*/
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#ifndef _DMABRG_H_
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#define _DMABRG_H_
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/* IRQ sources */
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#define DMABRGIRQ_USBDMA 0
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#define DMABRGIRQ_USBDMAERR 1
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#define DMABRGIRQ_A0TXF 2
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#define DMABRGIRQ_A0TXH 3
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#define DMABRGIRQ_A0RXF 4
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#define DMABRGIRQ_A0RXH 5
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#define DMABRGIRQ_A1TXF 6
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#define DMABRGIRQ_A1TXH 7
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#define DMABRGIRQ_A1RXF 8
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#define DMABRGIRQ_A1RXH 9
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extern int dmabrg_request_irq(unsigned int, void(*)(void *), void *);
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extern void dmabrg_free_irq(unsigned int);
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#endif
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