Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 464 insertions, 0 deletions

diff --git a/arch/frv/kernel/dma.c b/arch/frv/kernel/dma.c
new file mode 100644
index 00000000000..f5de6cf7df4
--- /dev/null
+++ b/arch/frv/kernel/dma.c
@@ -0,0 +1,464 @@
+/* dma.c: DMA controller management on FR401 and the like
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <asm/dma.h>
+#include <asm/gpio-regs.h>
+#include <asm/irc-regs.h>
+#include <asm/cpu-irqs.h>
+
+struct frv_dma_channel {
+	uint8_t			flags;
+#define FRV_DMA_FLAGS_RESERVED	0x01
+#define FRV_DMA_FLAGS_INUSE	0x02
+#define FRV_DMA_FLAGS_PAUSED	0x04
+	uint8_t			cap;		/* capabilities available */
+	int			irq;		/* completion IRQ */
+	uint32_t		dreqbit;
+	uint32_t		dackbit;
+	uint32_t		donebit;
+	const unsigned long	ioaddr;		/* DMA controller regs addr */
+	const char		*devname;
+	dma_irq_handler_t	handler;
+	void			*data;
+};
+
+
+#define __get_DMAC(IO,X)	({ *(volatile unsigned long *)((IO) + DMAC_##X##x); })
+
+#define __set_DMAC(IO,X,V)					\
+do {								\
+	*(volatile unsigned long *)((IO) + DMAC_##X##x) = (V);	\
+	mb();							\
+} while(0)
+
+#define ___set_DMAC(IO,X,V)					\
+do {								\
+	*(volatile unsigned long *)((IO) + DMAC_##X##x) = (V);	\
+} while(0)
+
+
+static struct frv_dma_channel frv_dma_channels[FRV_DMA_NCHANS] = {
+	[0] = {
+		.cap		= FRV_DMA_CAP_DREQ | FRV_DMA_CAP_DACK | FRV_DMA_CAP_DONE,
+		.irq		= IRQ_CPU_DMA0,
+		.dreqbit	= SIR_DREQ0_INPUT,
+		.dackbit	= SOR_DACK0_OUTPUT,
+		.donebit	= SOR_DONE0_OUTPUT,
+		.ioaddr		= 0xfe000900,
+	},
+	[1] = {
+		.cap		= FRV_DMA_CAP_DREQ | FRV_DMA_CAP_DACK | FRV_DMA_CAP_DONE,
+		.irq		= IRQ_CPU_DMA1,
+		.dreqbit	= SIR_DREQ1_INPUT,
+		.dackbit	= SOR_DACK1_OUTPUT,
+		.donebit	= SOR_DONE1_OUTPUT,
+		.ioaddr		= 0xfe000980,
+	},
+	[2] = {
+		.cap		= FRV_DMA_CAP_DREQ | FRV_DMA_CAP_DACK,
+		.irq		= IRQ_CPU_DMA2,
+		.dreqbit	= SIR_DREQ2_INPUT,
+		.dackbit	= SOR_DACK2_OUTPUT,
+		.ioaddr		= 0xfe000a00,
+	},
+	[3] = {
+		.cap		= FRV_DMA_CAP_DREQ | FRV_DMA_CAP_DACK,
+		.irq		= IRQ_CPU_DMA3,
+		.dreqbit	= SIR_DREQ3_INPUT,
+		.dackbit	= SOR_DACK3_OUTPUT,
+		.ioaddr		= 0xfe000a80,
+	},
+	[4] = {
+		.cap		= FRV_DMA_CAP_DREQ,
+		.irq		= IRQ_CPU_DMA4,
+		.dreqbit	= SIR_DREQ4_INPUT,
+		.ioaddr		= 0xfe001000,
+	},
+	[5] = {
+		.cap		= FRV_DMA_CAP_DREQ,
+		.irq		= IRQ_CPU_DMA5,
+		.dreqbit	= SIR_DREQ5_INPUT,
+		.ioaddr		= 0xfe001080,
+	},
+	[6] = {
+		.cap		= FRV_DMA_CAP_DREQ,
+		.irq		= IRQ_CPU_DMA6,
+		.dreqbit	= SIR_DREQ6_INPUT,
+		.ioaddr		= 0xfe001100,
+	},
+	[7] = {
+		.cap		= FRV_DMA_CAP_DREQ,
+		.irq		= IRQ_CPU_DMA7,
+		.dreqbit	= SIR_DREQ7_INPUT,
+		.ioaddr		= 0xfe001180,
+	},
+};
+
+static DEFINE_RWLOCK(frv_dma_channels_lock);
+
+unsigned long frv_dma_inprogress;
+
+#define frv_clear_dma_inprogress(channel) \
+	atomic_clear_mask(1 << (channel), &frv_dma_inprogress);
+
+#define frv_set_dma_inprogress(channel) \
+	atomic_set_mask(1 << (channel), &frv_dma_inprogress);
+
+/*****************************************************************************/
+/*
+ * DMA irq handler - determine channel involved, grab status and call real handler
+ */
+static irqreturn_t dma_irq_handler(int irq, void *_channel, struct pt_regs *regs)
+{
+	struct frv_dma_channel *channel = _channel;
+
+	frv_clear_dma_inprogress(channel - frv_dma_channels);
+	return channel->handler(channel - frv_dma_channels,
+				__get_DMAC(channel->ioaddr, CSTR),
+				channel->data,
+				regs);
+
+} /* end dma_irq_handler() */
+
+/*****************************************************************************/
+/*
+ * Determine which DMA controllers are present on this CPU
+ */
+void __init frv_dma_init(void)
+{
+	unsigned long psr = __get_PSR();
+	int num_dma, i;
+
+	/* First, determine how many DMA channels are available */
+	switch (PSR_IMPLE(psr)) {
+	case PSR_IMPLE_FR405:
+	case PSR_IMPLE_FR451:
+	case PSR_IMPLE_FR501:
+	case PSR_IMPLE_FR551:
+		num_dma = FRV_DMA_8CHANS;
+		break;
+
+	case PSR_IMPLE_FR401:
+	default:
+		num_dma = FRV_DMA_4CHANS;
+		break;
+	}
+
+	/* Now mark all of the non-existent channels as reserved */
+	for(i = num_dma; i < FRV_DMA_NCHANS; i++)
+		frv_dma_channels[i].flags = FRV_DMA_FLAGS_RESERVED;
+
+} /* end frv_dma_init() */
+
+/*****************************************************************************/
+/*
+ * allocate a DMA controller channel and the IRQ associated with it
+ */
+int frv_dma_open(const char *devname,
+		 unsigned long dmamask,
+		 int dmacap,
+		 dma_irq_handler_t handler,
+		 unsigned long irq_flags,
+		 void *data)
+{
+	struct frv_dma_channel *channel;
+	int dma, ret;
+	uint32_t val;
+
+	write_lock(&frv_dma_channels_lock);
+
+	ret = -ENOSPC;
+
+	for (dma = FRV_DMA_NCHANS - 1; dma >= 0; dma--) {
+		channel = &frv_dma_channels[dma];
+
+		if (!test_bit(dma, &dmamask))
+			continue;
+
+		if ((channel->cap & dmacap) != dmacap)
+			continue;
+
+		if (!frv_dma_channels[dma].flags)
+			goto found;
+	}
+
+	goto out;
+
+ found:
+	ret = request_irq(channel->irq, dma_irq_handler, irq_flags, devname, channel);
+	if (ret < 0)
+		goto out;
+
+	/* okay, we've allocated all the resources */
+	channel = &frv_dma_channels[dma];
+
+	channel->flags		|= FRV_DMA_FLAGS_INUSE;
+	channel->devname	= devname;
+	channel->handler	= handler;
+	channel->data		= data;
+
+	/* Now make sure we are set up for DMA and not GPIO */
+	/* SIR bit must be set for DMA to work */
+	__set_SIR(channel->dreqbit | __get_SIR());
+	/* SOR bits depend on what the caller requests */
+	val = __get_SOR();
+	if(dmacap & FRV_DMA_CAP_DACK)
+		val |= channel->dackbit;
+	else
+		val &= ~channel->dackbit;
+	if(dmacap & FRV_DMA_CAP_DONE)
+		val |= channel->donebit;
+	else
+		val &= ~channel->donebit;
+	__set_SOR(val);
+
+	ret = dma;
+ out:
+	write_unlock(&frv_dma_channels_lock);
+	return ret;
+} /* end frv_dma_open() */
+
+EXPORT_SYMBOL(frv_dma_open);
+
+/*****************************************************************************/
+/*
+ * close a DMA channel and its associated interrupt
+ */
+void frv_dma_close(int dma)
+{
+	struct frv_dma_channel *channel = &frv_dma_channels[dma];
+	unsigned long flags;
+
+	write_lock_irqsave(&frv_dma_channels_lock, flags);
+
+	free_irq(channel->irq, channel);
+	frv_dma_stop(dma);
+
+	channel->flags &= ~FRV_DMA_FLAGS_INUSE;
+
+	write_unlock_irqrestore(&frv_dma_channels_lock, flags);
+} /* end frv_dma_close() */
+
+EXPORT_SYMBOL(frv_dma_close);
+
+/*****************************************************************************/
+/*
+ * set static configuration on a DMA channel
+ */
+void frv_dma_config(int dma, unsigned long ccfr, unsigned long cctr, unsigned long apr)
+{
+	unsigned long ioaddr = frv_dma_channels[dma].ioaddr;
+
+	___set_DMAC(ioaddr, CCFR, ccfr);
+	___set_DMAC(ioaddr, CCTR, cctr);
+	___set_DMAC(ioaddr, APR,  apr);
+	mb();
+
+} /* end frv_dma_config() */
+
+EXPORT_SYMBOL(frv_dma_config);
+
+/*****************************************************************************/
+/*
+ * start a DMA channel
+ */
+void frv_dma_start(int dma,
+		   unsigned long sba, unsigned long dba,
+		   unsigned long pix, unsigned long six, unsigned long bcl)
+{
+	unsigned long ioaddr = frv_dma_channels[dma].ioaddr;
+
+	___set_DMAC(ioaddr, SBA,  sba);
+	___set_DMAC(ioaddr, DBA,  dba);
+	___set_DMAC(ioaddr, PIX,  pix);
+	___set_DMAC(ioaddr, SIX,  six);
+	___set_DMAC(ioaddr, BCL,  bcl);
+	___set_DMAC(ioaddr, CSTR, 0);
+	mb();
+
+	__set_DMAC(ioaddr, CCTR, __get_DMAC(ioaddr, CCTR) | DMAC_CCTRx_ACT);
+	frv_set_dma_inprogress(dma);
+
+} /* end frv_dma_start() */
+
+EXPORT_SYMBOL(frv_dma_start);
+
+/*****************************************************************************/
+/*
+ * restart a DMA channel that's been stopped in circular addressing mode by comparison-end
+ */
+void frv_dma_restart_circular(int dma, unsigned long six)
+{
+	unsigned long ioaddr = frv_dma_channels[dma].ioaddr;
+
+	___set_DMAC(ioaddr, SIX,  six);
+	___set_DMAC(ioaddr, CSTR, __get_DMAC(ioaddr, CSTR) & ~DMAC_CSTRx_CE);
+	mb();
+
+	__set_DMAC(ioaddr, CCTR, __get_DMAC(ioaddr, CCTR) | DMAC_CCTRx_ACT);
+	frv_set_dma_inprogress(dma);
+
+} /* end frv_dma_restart_circular() */
+
+EXPORT_SYMBOL(frv_dma_restart_circular);
+
+/*****************************************************************************/
+/*
+ * stop a DMA channel
+ */
+void frv_dma_stop(int dma)
+{
+	unsigned long ioaddr = frv_dma_channels[dma].ioaddr;
+	uint32_t cctr;
+
+	___set_DMAC(ioaddr, CSTR, 0);
+	cctr = __get_DMAC(ioaddr, CCTR);
+	cctr &= ~(DMAC_CCTRx_IE | DMAC_CCTRx_ACT);
+	cctr |= DMAC_CCTRx_FC; 	/* fifo clear */
+	__set_DMAC(ioaddr, CCTR, cctr);
+	__set_DMAC(ioaddr, BCL,  0);
+	frv_clear_dma_inprogress(dma);
+} /* end frv_dma_stop() */
+
+EXPORT_SYMBOL(frv_dma_stop);
+
+/*****************************************************************************/
+/*
+ * test interrupt status of DMA channel
+ */
+int is_frv_dma_interrupting(int dma)
+{
+	unsigned long ioaddr = frv_dma_channels[dma].ioaddr;
+
+	return __get_DMAC(ioaddr, CSTR) & (1 << 23);
+
+} /* end is_frv_dma_interrupting() */
+
+EXPORT_SYMBOL(is_frv_dma_interrupting);
+
+/*****************************************************************************/
+/*
+ * dump data about a DMA channel
+ */
+void frv_dma_dump(int dma)
+{
+	unsigned long ioaddr = frv_dma_channels[dma].ioaddr;
+	unsigned long cstr, pix, six, bcl;
+
+	cstr = __get_DMAC(ioaddr, CSTR);
+	pix  = __get_DMAC(ioaddr, PIX);
+	six  = __get_DMAC(ioaddr, SIX);
+	bcl  = __get_DMAC(ioaddr, BCL);
+
+	printk("DMA[%d] cstr=%lx pix=%lx six=%lx bcl=%lx\n", dma, cstr, pix, six, bcl);
+
+} /* end frv_dma_dump() */
+
+EXPORT_SYMBOL(frv_dma_dump);
+
+/*****************************************************************************/
+/*
+ * pause all DMA controllers
+ * - called by clock mangling routines
+ * - caller must be holding interrupts disabled
+ */
+void frv_dma_pause_all(void)
+{
+	struct frv_dma_channel *channel;
+	unsigned long ioaddr;
+	unsigned long cstr, cctr;
+	int dma;
+
+	write_lock(&frv_dma_channels_lock);
+
+	for (dma = FRV_DMA_NCHANS - 1; dma >= 0; dma--) {
+		channel = &frv_dma_channels[dma];
+
+		if (!(channel->flags & FRV_DMA_FLAGS_INUSE))
+			continue;
+
+		ioaddr = channel->ioaddr;
+		cctr = __get_DMAC(ioaddr, CCTR);
+		if (cctr & DMAC_CCTRx_ACT) {
+			cctr &= ~DMAC_CCTRx_ACT;
+			__set_DMAC(ioaddr, CCTR, cctr);
+
+			do {
+				cstr = __get_DMAC(ioaddr, CSTR);
+			} while (cstr & DMAC_CSTRx_BUSY);
+
+			if (cstr & DMAC_CSTRx_FED)
+				channel->flags |= FRV_DMA_FLAGS_PAUSED;
+			frv_clear_dma_inprogress(dma);
+		}
+	}
+
+} /* end frv_dma_pause_all() */
+
+EXPORT_SYMBOL(frv_dma_pause_all);
+
+/*****************************************************************************/
+/*
+ * resume paused DMA controllers
+ * - called by clock mangling routines
+ * - caller must be holding interrupts disabled
+ */
+void frv_dma_resume_all(void)
+{
+	struct frv_dma_channel *channel;
+	unsigned long ioaddr;
+	unsigned long cstr, cctr;
+	int dma;
+
+	for (dma = FRV_DMA_NCHANS - 1; dma >= 0; dma--) {
+		channel = &frv_dma_channels[dma];
+
+		if (!(channel->flags & FRV_DMA_FLAGS_PAUSED))
+			continue;
+
+		ioaddr = channel->ioaddr;
+		cstr = __get_DMAC(ioaddr, CSTR);
+		cstr &= ~(DMAC_CSTRx_FED | DMAC_CSTRx_INT);
+		__set_DMAC(ioaddr, CSTR, cstr);
+
+		cctr = __get_DMAC(ioaddr, CCTR);
+		cctr |= DMAC_CCTRx_ACT;
+		__set_DMAC(ioaddr, CCTR, cctr);
+
+		channel->flags &= ~FRV_DMA_FLAGS_PAUSED;
+		frv_set_dma_inprogress(dma);
+	}
+
+	write_unlock(&frv_dma_channels_lock);
+
+} /* end frv_dma_resume_all() */
+
+EXPORT_SYMBOL(frv_dma_resume_all);
+
+/*****************************************************************************/
+/*
+ * dma status clear
+ */
+void frv_dma_status_clear(int dma)
+{
+	unsigned long ioaddr = frv_dma_channels[dma].ioaddr;
+	uint32_t cctr;
+	___set_DMAC(ioaddr, CSTR, 0);
+
+	cctr = __get_DMAC(ioaddr, CCTR);
+} /* end frv_dma_status_clear() */
+
+EXPORT_SYMBOL(frv_dma_status_clear);