254 lines
5.6 KiB
C
254 lines
5.6 KiB
C
/* 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 <linux/of_device.h>
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#include <asm/ebus_dma.h>
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#include <asm/ns87303.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 ecpp_probe(struct platform_device *op)
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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->dev.of_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->archdata.irqs[0], PARPORT_DMA_NOFIFO,
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op->dev.parent->parent, 0);
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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->archdata.irqs[0],
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slot,
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op->dev.parent,
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0);
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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 ecpp_remove(struct platform_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 const 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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.name = "parallel",
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.compatible = "pnpALI,1533,3",
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},
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{},
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};
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static struct platform_driver ecpp_driver = {
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.driver = {
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.name = "ecpp",
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.owner = THIS_MODULE,
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.of_match_table = ecpp_match,
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},
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.probe = ecpp_probe,
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.remove = 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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return platform_driver_register(&ecpp_driver);
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}
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#endif /* !(_ASM_SPARC64_PARPORT_H */
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