![Al Viro](/assets/img/avatar_default.png)
Part of parport_pc that uses ISA DMA helpers made conditional on CONFIG_ISA_DMA_API. As the result, driver got usable for boxen that do not have ISA DMA stuff and have normal PCI parport card stuck into them - these never use DMA anyway. Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
182 lines
4.3 KiB
C
182 lines
4.3 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/isa.h>
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#include <asm/ns87303.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 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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} sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
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static __inline__ void enable_dma(unsigned int dmanr)
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{
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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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ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
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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 ebus_ecpp_p(struct linux_ebus_device *edev)
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{
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if (!strcmp(edev->prom_name, "ecpp"))
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return 1;
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if (!strcmp(edev->prom_name, "parallel")) {
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char compat[19];
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prom_getstring(edev->prom_node,
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"compatible",
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compat, sizeof(compat));
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compat[18] = '\0';
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if (!strcmp(compat, "ecpp"))
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return 1;
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if (!strcmp(compat, "ns87317-ecpp") &&
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!strcmp(compat + 13, "ecpp"))
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return 1;
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}
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return 0;
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}
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static int parport_isa_probe(int count)
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{
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struct sparc_isa_bridge *isa_br;
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struct sparc_isa_device *isa_dev;
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for_each_isa(isa_br) {
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for_each_isadev(isa_dev, isa_br) {
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struct sparc_isa_device *child;
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unsigned long base;
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if (strcmp(isa_dev->prom_name, "dma"))
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continue;
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child = isa_dev->child;
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while (child) {
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if (!strcmp(child->prom_name, "parallel"))
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break;
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child = child->next;
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}
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if (!child)
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continue;
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base = child->resource.start;
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/* No DMA, see commentary in
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* asm-sparc64/floppy.h:isa_floppy_init()
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*/
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if (parport_pc_probe_port(base, base + 0x400,
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child->irq, PARPORT_DMA_NOFIFO,
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child->bus->self))
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count++;
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}
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}
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return count;
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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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struct linux_ebus *ebus;
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struct linux_ebus_device *edev;
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int count = 0;
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for_each_ebus(ebus) {
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for_each_ebusdev(edev, ebus) {
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if (ebus_ecpp_p(edev)) {
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unsigned long base = edev->resource[0].start;
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unsigned long config = edev->resource[1].start;
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unsigned long d_base = edev->resource[2].start;
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unsigned long d_len;
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spin_lock_init(&sparc_ebus_dmas[count].info.lock);
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d_len = (edev->resource[2].end -
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d_base) + 1;
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sparc_ebus_dmas[count].info.regs =
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ioremap(d_base, d_len);
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if (!sparc_ebus_dmas[count].info.regs)
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continue;
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sparc_ebus_dmas[count].info.flags = 0;
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sparc_ebus_dmas[count].info.callback = NULL;
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sparc_ebus_dmas[count].info.client_cookie = NULL;
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sparc_ebus_dmas[count].info.irq = 0xdeadbeef;
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strcpy(sparc_ebus_dmas[count].info.name, "parport");
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if (ebus_dma_register(&sparc_ebus_dmas[count].info))
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continue;
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ebus_dma_irq_enable(&sparc_ebus_dmas[count].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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if (parport_pc_probe_port(base, base + 0x400,
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edev->irqs[0],
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count, ebus->self))
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count++;
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}
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}
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}
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count = parport_isa_probe(count);
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return count;
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}
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#endif /* !(_ASM_SPARC64_PARPORT_H */
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