![David S. Miller](/assets/img/avatar_default.png)
Fully unify all of the DMA ops so that subordinate bus types to the DMA operation providers (such as ebus, isa, of_device) can work transparently. Basically, we just make sure that for every system device we create, the dev->archdata 'iommu' and 'stc' fields are filled in. Then we have two platform variants of the DMA ops, one for SUN4U which actually programs the real hardware, and one for SUN4V which makes hypervisor calls. This also fixes the crashes in parport_pc on sparc64, reported by Meelis Roos. Signed-off-by: David S. Miller <davem@davemloft.net>
248 lines
5.6 KiB
C
248 lines
5.6 KiB
C
/* $Id: parport.h,v 1.11 2001/05/11 07:54:24 davem Exp $
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* parport.h: sparc64 specific parport initialization and dma.
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*
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* Copyright (C) 1999 Eddie C. Dost (ecd@skynet.be)
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*/
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#ifndef _ASM_SPARC64_PARPORT_H
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#define _ASM_SPARC64_PARPORT_H 1
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#include <asm/ebus.h>
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#include <asm/ns87303.h>
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#include <asm/of_device.h>
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#include <asm/prom.h>
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#define PARPORT_PC_MAX_PORTS PARPORT_MAX
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/*
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* While sparc64 doesn't have an ISA DMA API, we provide something that looks
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* close enough to make parport_pc happy
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*/
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#define HAS_DMA
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static DEFINE_SPINLOCK(dma_spin_lock);
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#define claim_dma_lock() \
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({ unsigned long flags; \
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spin_lock_irqsave(&dma_spin_lock, flags); \
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flags; \
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})
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#define release_dma_lock(__flags) \
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spin_unlock_irqrestore(&dma_spin_lock, __flags);
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static struct sparc_ebus_info {
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struct ebus_dma_info info;
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unsigned int addr;
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unsigned int count;
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int lock;
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struct parport *port;
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} sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
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static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);
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static __inline__ int request_dma(unsigned int dmanr, const char *device_id)
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{
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if (dmanr >= PARPORT_PC_MAX_PORTS)
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return -EINVAL;
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if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
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return -EBUSY;
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return 0;
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}
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static __inline__ void free_dma(unsigned int dmanr)
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{
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if (dmanr >= PARPORT_PC_MAX_PORTS) {
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printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
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return;
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}
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if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
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printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
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return;
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}
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}
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static __inline__ void enable_dma(unsigned int dmanr)
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{
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ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
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if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
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sparc_ebus_dmas[dmanr].addr,
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sparc_ebus_dmas[dmanr].count))
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BUG();
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}
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static __inline__ void disable_dma(unsigned int dmanr)
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{
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ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
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}
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static __inline__ void clear_dma_ff(unsigned int dmanr)
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{
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/* nothing */
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}
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static __inline__ void set_dma_mode(unsigned int dmanr, char mode)
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{
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ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
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}
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static __inline__ void set_dma_addr(unsigned int dmanr, unsigned int addr)
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{
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sparc_ebus_dmas[dmanr].addr = addr;
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}
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static __inline__ void set_dma_count(unsigned int dmanr, unsigned int count)
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{
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sparc_ebus_dmas[dmanr].count = count;
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}
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static __inline__ unsigned int get_dma_residue(unsigned int dmanr)
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{
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return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
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}
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static int __devinit ecpp_probe(struct of_device *op, const struct of_device_id *match)
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{
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unsigned long base = op->resource[0].start;
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unsigned long config = op->resource[1].start;
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unsigned long d_base = op->resource[2].start;
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unsigned long d_len;
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struct device_node *parent;
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struct parport *p;
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int slot, err;
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parent = op->node->parent;
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if (!strcmp(parent->name, "dma")) {
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p = parport_pc_probe_port(base, base + 0x400,
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op->irqs[0], PARPORT_DMA_NOFIFO,
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op->dev.parent->parent);
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if (!p)
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return -ENOMEM;
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dev_set_drvdata(&op->dev, p);
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return 0;
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}
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for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) {
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if (!test_and_set_bit(slot, dma_slot_map))
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break;
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}
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err = -ENODEV;
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if (slot >= PARPORT_PC_MAX_PORTS)
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goto out_err;
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spin_lock_init(&sparc_ebus_dmas[slot].info.lock);
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d_len = (op->resource[2].end - d_base) + 1UL;
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sparc_ebus_dmas[slot].info.regs =
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of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA");
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if (!sparc_ebus_dmas[slot].info.regs)
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goto out_clear_map;
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sparc_ebus_dmas[slot].info.flags = 0;
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sparc_ebus_dmas[slot].info.callback = NULL;
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sparc_ebus_dmas[slot].info.client_cookie = NULL;
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sparc_ebus_dmas[slot].info.irq = 0xdeadbeef;
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strcpy(sparc_ebus_dmas[slot].info.name, "parport");
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if (ebus_dma_register(&sparc_ebus_dmas[slot].info))
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goto out_unmap_regs;
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ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1);
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/* Configure IRQ to Push Pull, Level Low */
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/* Enable ECP, set bit 2 of the CTR first */
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outb(0x04, base + 0x02);
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ns87303_modify(config, PCR,
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PCR_EPP_ENABLE |
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PCR_IRQ_ODRAIN,
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PCR_ECP_ENABLE |
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PCR_ECP_CLK_ENA |
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PCR_IRQ_POLAR);
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/* CTR bit 5 controls direction of port */
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ns87303_modify(config, PTR,
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0, PTR_LPT_REG_DIR);
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p = parport_pc_probe_port(base, base + 0x400,
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op->irqs[0],
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slot,
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op->dev.parent);
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err = -ENOMEM;
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if (!p)
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goto out_disable_irq;
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dev_set_drvdata(&op->dev, p);
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return 0;
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out_disable_irq:
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ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
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ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
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out_unmap_regs:
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of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);
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out_clear_map:
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clear_bit(slot, dma_slot_map);
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out_err:
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return err;
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}
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static int __devexit ecpp_remove(struct of_device *op)
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{
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struct parport *p = dev_get_drvdata(&op->dev);
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int slot = p->dma;
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parport_pc_unregister_port(p);
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if (slot != PARPORT_DMA_NOFIFO) {
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unsigned long d_base = op->resource[2].start;
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unsigned long d_len;
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d_len = (op->resource[2].end - d_base) + 1UL;
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ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
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ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
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of_iounmap(&op->resource[2],
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sparc_ebus_dmas[slot].info.regs,
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d_len);
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clear_bit(slot, dma_slot_map);
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}
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return 0;
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}
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static struct of_device_id ecpp_match[] = {
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{
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.name = "ecpp",
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},
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{
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.name = "parallel",
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.compatible = "ecpp",
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},
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{
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.name = "parallel",
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.compatible = "ns87317-ecpp",
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},
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{},
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};
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static struct of_platform_driver ecpp_driver = {
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.name = "ecpp",
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.match_table = ecpp_match,
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.probe = ecpp_probe,
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.remove = __devexit_p(ecpp_remove),
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};
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static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
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{
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of_register_driver(&ecpp_driver, &of_bus_type);
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return 0;
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}
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#endif /* !(_ASM_SPARC64_PARPORT_H */
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