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255 lines
5.7 KiB
255 lines
5.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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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 ([email protected]) |
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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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#ifdef CONFIG_PARPORT_PC_FIFO |
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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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#endif |
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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 (of_node_name_eq(parent, "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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.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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