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0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /* parport.h: sparc64 specific parport initialization and dma.
0003  *
0004  * Copyright (C) 1999  Eddie C. Dost  (ecd@skynet.be)
0005  */
0006 
0007 #ifndef _ASM_SPARC64_PARPORT_H
0008 #define _ASM_SPARC64_PARPORT_H 1
0009 
0010 #include <linux/of_device.h>
0011 
0012 #include <asm/ebus_dma.h>
0013 #include <asm/ns87303.h>
0014 #include <asm/prom.h>
0015 
0016 #define PARPORT_PC_MAX_PORTS    PARPORT_MAX
0017 
0018 /*
0019  * While sparc64 doesn't have an ISA DMA API, we provide something that looks
0020  * close enough to make parport_pc happy
0021  */
0022 #define HAS_DMA
0023 
0024 #ifdef CONFIG_PARPORT_PC_FIFO
0025 static DEFINE_SPINLOCK(dma_spin_lock);
0026 
0027 #define claim_dma_lock() \
0028 ({  unsigned long flags; \
0029     spin_lock_irqsave(&dma_spin_lock, flags); \
0030     flags; \
0031 })
0032 
0033 #define release_dma_lock(__flags) \
0034     spin_unlock_irqrestore(&dma_spin_lock, __flags);
0035 #endif
0036 
0037 static struct sparc_ebus_info {
0038     struct ebus_dma_info info;
0039     unsigned int addr;
0040     unsigned int count;
0041     int lock;
0042 
0043     struct parport *port;
0044 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS];
0045 
0046 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS);
0047 
0048 static inline int request_dma(unsigned int dmanr, const char *device_id)
0049 {
0050     if (dmanr >= PARPORT_PC_MAX_PORTS)
0051         return -EINVAL;
0052     if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0)
0053         return -EBUSY;
0054     return 0;
0055 }
0056 
0057 static inline void free_dma(unsigned int dmanr)
0058 {
0059     if (dmanr >= PARPORT_PC_MAX_PORTS) {
0060         printk(KERN_WARNING "Trying to free DMA%d\n", dmanr);
0061         return;
0062     }
0063     if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) {
0064         printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr);
0065         return;
0066     }
0067 }
0068 
0069 static inline void enable_dma(unsigned int dmanr)
0070 {
0071     ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
0072 
0073     if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
0074                  sparc_ebus_dmas[dmanr].addr,
0075                  sparc_ebus_dmas[dmanr].count))
0076         BUG();
0077 }
0078 
0079 static inline void disable_dma(unsigned int dmanr)
0080 {
0081     ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0);
0082 }
0083 
0084 static inline void clear_dma_ff(unsigned int dmanr)
0085 {
0086     /* nothing */
0087 }
0088 
0089 static inline void set_dma_mode(unsigned int dmanr, char mode)
0090 {
0091     ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE));
0092 }
0093 
0094 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr)
0095 {
0096     sparc_ebus_dmas[dmanr].addr = addr;
0097 }
0098 
0099 static inline void set_dma_count(unsigned int dmanr, unsigned int count)
0100 {
0101     sparc_ebus_dmas[dmanr].count = count;
0102 }
0103 
0104 static inline unsigned int get_dma_residue(unsigned int dmanr)
0105 {
0106     return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info);
0107 }
0108 
0109 static int ecpp_probe(struct platform_device *op)
0110 {
0111     unsigned long base = op->resource[0].start;
0112     unsigned long config = op->resource[1].start;
0113     unsigned long d_base = op->resource[2].start;
0114     unsigned long d_len;
0115     struct device_node *parent;
0116     struct parport *p;
0117     int slot, err;
0118 
0119     parent = op->dev.of_node->parent;
0120     if (of_node_name_eq(parent, "dma")) {
0121         p = parport_pc_probe_port(base, base + 0x400,
0122                       op->archdata.irqs[0], PARPORT_DMA_NOFIFO,
0123                       op->dev.parent->parent, 0);
0124         if (!p)
0125             return -ENOMEM;
0126         dev_set_drvdata(&op->dev, p);
0127         return 0;
0128     }
0129 
0130     for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) {
0131         if (!test_and_set_bit(slot, dma_slot_map))
0132             break;
0133     }
0134     err = -ENODEV;
0135     if (slot >= PARPORT_PC_MAX_PORTS)
0136         goto out_err;
0137 
0138     spin_lock_init(&sparc_ebus_dmas[slot].info.lock);
0139 
0140     d_len = (op->resource[2].end - d_base) + 1UL;
0141     sparc_ebus_dmas[slot].info.regs =
0142         of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA");
0143 
0144     if (!sparc_ebus_dmas[slot].info.regs)
0145         goto out_clear_map;
0146 
0147     sparc_ebus_dmas[slot].info.flags = 0;
0148     sparc_ebus_dmas[slot].info.callback = NULL;
0149     sparc_ebus_dmas[slot].info.client_cookie = NULL;
0150     sparc_ebus_dmas[slot].info.irq = 0xdeadbeef;
0151     strcpy(sparc_ebus_dmas[slot].info.name, "parport");
0152     if (ebus_dma_register(&sparc_ebus_dmas[slot].info))
0153         goto out_unmap_regs;
0154 
0155     ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1);
0156 
0157     /* Configure IRQ to Push Pull, Level Low */
0158     /* Enable ECP, set bit 2 of the CTR first */
0159     outb(0x04, base + 0x02);
0160     ns87303_modify(config, PCR,
0161                PCR_EPP_ENABLE |
0162                PCR_IRQ_ODRAIN,
0163                PCR_ECP_ENABLE |
0164                PCR_ECP_CLK_ENA |
0165                PCR_IRQ_POLAR);
0166 
0167     /* CTR bit 5 controls direction of port */
0168     ns87303_modify(config, PTR,
0169                0, PTR_LPT_REG_DIR);
0170 
0171     p = parport_pc_probe_port(base, base + 0x400,
0172                   op->archdata.irqs[0],
0173                   slot,
0174                   op->dev.parent,
0175                   0);
0176     err = -ENOMEM;
0177     if (!p)
0178         goto out_disable_irq;
0179 
0180     dev_set_drvdata(&op->dev, p);
0181 
0182     return 0;
0183 
0184 out_disable_irq:
0185     ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
0186     ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
0187 
0188 out_unmap_regs:
0189     of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len);
0190 
0191 out_clear_map:
0192     clear_bit(slot, dma_slot_map);
0193 
0194 out_err:
0195     return err;
0196 }
0197 
0198 static int ecpp_remove(struct platform_device *op)
0199 {
0200     struct parport *p = dev_get_drvdata(&op->dev);
0201     int slot = p->dma;
0202 
0203     parport_pc_unregister_port(p);
0204 
0205     if (slot != PARPORT_DMA_NOFIFO) {
0206         unsigned long d_base = op->resource[2].start;
0207         unsigned long d_len;
0208 
0209         d_len = (op->resource[2].end - d_base) + 1UL;
0210 
0211         ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0);
0212         ebus_dma_unregister(&sparc_ebus_dmas[slot].info);
0213         of_iounmap(&op->resource[2],
0214                sparc_ebus_dmas[slot].info.regs,
0215                d_len);
0216         clear_bit(slot, dma_slot_map);
0217     }
0218 
0219     return 0;
0220 }
0221 
0222 static const struct of_device_id ecpp_match[] = {
0223     {
0224         .name = "ecpp",
0225     },
0226     {
0227         .name = "parallel",
0228         .compatible = "ecpp",
0229     },
0230     {
0231         .name = "parallel",
0232         .compatible = "ns87317-ecpp",
0233     },
0234     {
0235         .name = "parallel",
0236         .compatible = "pnpALI,1533,3",
0237     },
0238     {},
0239 };
0240 
0241 static struct platform_driver ecpp_driver = {
0242     .driver = {
0243         .name = "ecpp",
0244         .of_match_table = ecpp_match,
0245     },
0246     .probe          = ecpp_probe,
0247     .remove         = ecpp_remove,
0248 };
0249 
0250 static int parport_pc_find_nonpci_ports(int autoirq, int autodma)
0251 {
0252     return platform_driver_register(&ecpp_driver);
0253 }
0254 
0255 #endif /* !(_ASM_SPARC64_PARPORT_H */
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