1 /* parport.h: sparc64 specific parport initialization and dma. 2 * 3 * Copyright (C) 1999 Eddie C. Dost (ecd@skynet.be) 4 */ 5 6 #ifndef _ASM_SPARC64_PARPORT_H 7 #define _ASM_SPARC64_PARPORT_H 1 8 9 #include <asm/ebus.h> 10 #include <asm/ns87303.h> 11 #include <asm/of_device.h> 12 #include <asm/prom.h> 13 14 #define PARPORT_PC_MAX_PORTS PARPORT_MAX 15 16 /* 17 * While sparc64 doesn't have an ISA DMA API, we provide something that looks 18 * close enough to make parport_pc happy 19 */ 20 #define HAS_DMA 21 22 static DEFINE_SPINLOCK(dma_spin_lock); 23 24 #define claim_dma_lock() \ 25 ({ unsigned long flags; \ 26 spin_lock_irqsave(&dma_spin_lock, flags); \ 27 flags; \ 28 }) 29 30 #define release_dma_lock(__flags) \ 31 spin_unlock_irqrestore(&dma_spin_lock, __flags); 32 33 static struct sparc_ebus_info { 34 struct ebus_dma_info info; 35 unsigned int addr; 36 unsigned int count; 37 int lock; 38 39 struct parport *port; 40 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS]; 41 42 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS); 43 44 static inline int request_dma(unsigned int dmanr, const char *device_id) 45 { 46 if (dmanr >= PARPORT_PC_MAX_PORTS) 47 return -EINVAL; 48 if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0) 49 return -EBUSY; 50 return 0; 51 } 52 53 static inline void free_dma(unsigned int dmanr) 54 { 55 if (dmanr >= PARPORT_PC_MAX_PORTS) { 56 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr); 57 return; 58 } 59 if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) { 60 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr); 61 return; 62 } 63 } 64 65 static inline void enable_dma(unsigned int dmanr) 66 { 67 ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1); 68 69 if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info, 70 sparc_ebus_dmas[dmanr].addr, 71 sparc_ebus_dmas[dmanr].count)) 72 BUG(); 73 } 74 75 static inline void disable_dma(unsigned int dmanr) 76 { 77 ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0); 78 } 79 80 static inline void clear_dma_ff(unsigned int dmanr) 81 { 82 /* nothing */ 83 } 84 85 static inline void set_dma_mode(unsigned int dmanr, char mode) 86 { 87 ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE)); 88 } 89 90 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr) 91 { 92 sparc_ebus_dmas[dmanr].addr = addr; 93 } 94 95 static inline void set_dma_count(unsigned int dmanr, unsigned int count) 96 { 97 sparc_ebus_dmas[dmanr].count = count; 98 } 99 100 static inline unsigned int get_dma_residue(unsigned int dmanr) 101 { 102 return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info); 103 } 104 105 static int __devinit ecpp_probe(struct of_device *op, const struct of_device_id *match) 106 { 107 unsigned long base = op->resource[0].start; 108 unsigned long config = op->resource[1].start; 109 unsigned long d_base = op->resource[2].start; 110 unsigned long d_len; 111 struct device_node *parent; 112 struct parport *p; 113 int slot, err; 114 115 parent = op->node->parent; 116 if (!strcmp(parent->name, "dma")) { 117 p = parport_pc_probe_port(base, base + 0x400, 118 op->irqs[0], PARPORT_DMA_NOFIFO, 119 op->dev.parent->parent); 120 if (!p) 121 return -ENOMEM; 122 dev_set_drvdata(&op->dev, p); 123 return 0; 124 } 125 126 for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) { 127 if (!test_and_set_bit(slot, dma_slot_map)) 128 break; 129 } 130 err = -ENODEV; 131 if (slot >= PARPORT_PC_MAX_PORTS) 132 goto out_err; 133 134 spin_lock_init(&sparc_ebus_dmas[slot].info.lock); 135 136 d_len = (op->resource[2].end - d_base) + 1UL; 137 sparc_ebus_dmas[slot].info.regs = 138 of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA"); 139 140 if (!sparc_ebus_dmas[slot].info.regs) 141 goto out_clear_map; 142 143 sparc_ebus_dmas[slot].info.flags = 0; 144 sparc_ebus_dmas[slot].info.callback = NULL; 145 sparc_ebus_dmas[slot].info.client_cookie = NULL; 146 sparc_ebus_dmas[slot].info.irq = 0xdeadbeef; 147 strcpy(sparc_ebus_dmas[slot].info.name, "parport"); 148 if (ebus_dma_register(&sparc_ebus_dmas[slot].info)) 149 goto out_unmap_regs; 150 151 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1); 152 153 /* Configure IRQ to Push Pull, Level Low */ 154 /* Enable ECP, set bit 2 of the CTR first */ 155 outb(0x04, base + 0x02); 156 ns87303_modify(config, PCR, 157 PCR_EPP_ENABLE | 158 PCR_IRQ_ODRAIN, 159 PCR_ECP_ENABLE | 160 PCR_ECP_CLK_ENA | 161 PCR_IRQ_POLAR); 162 163 /* CTR bit 5 controls direction of port */ 164 ns87303_modify(config, PTR, 165 0, PTR_LPT_REG_DIR); 166 167 p = parport_pc_probe_port(base, base + 0x400, 168 op->irqs[0], 169 slot, 170 op->dev.parent); 171 err = -ENOMEM; 172 if (!p) 173 goto out_disable_irq; 174 175 dev_set_drvdata(&op->dev, p); 176 177 return 0; 178 179 out_disable_irq: 180 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); 181 ebus_dma_unregister(&sparc_ebus_dmas[slot].info); 182 183 out_unmap_regs: 184 of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len); 185 186 out_clear_map: 187 clear_bit(slot, dma_slot_map); 188 189 out_err: 190 return err; 191 } 192 193 static int __devexit ecpp_remove(struct of_device *op) 194 { 195 struct parport *p = dev_get_drvdata(&op->dev); 196 int slot = p->dma; 197 198 parport_pc_unregister_port(p); 199 200 if (slot != PARPORT_DMA_NOFIFO) { 201 unsigned long d_base = op->resource[2].start; 202 unsigned long d_len; 203 204 d_len = (op->resource[2].end - d_base) + 1UL; 205 206 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); 207 ebus_dma_unregister(&sparc_ebus_dmas[slot].info); 208 of_iounmap(&op->resource[2], 209 sparc_ebus_dmas[slot].info.regs, 210 d_len); 211 clear_bit(slot, dma_slot_map); 212 } 213 214 return 0; 215 } 216 217 static struct of_device_id ecpp_match[] = { 218 { 219 .name = "ecpp", 220 }, 221 { 222 .name = "parallel", 223 .compatible = "ecpp", 224 }, 225 { 226 .name = "parallel", 227 .compatible = "ns87317-ecpp", 228 }, 229 {}, 230 }; 231 232 static struct of_platform_driver ecpp_driver = { 233 .name = "ecpp", 234 .match_table = ecpp_match, 235 .probe = ecpp_probe, 236 .remove = __devexit_p(ecpp_remove), 237 }; 238 239 static int parport_pc_find_nonpci_ports(int autoirq, int autodma) 240 { 241 of_register_driver(&ecpp_driver, &of_bus_type); 242 243 return 0; 244 } 245 246 #endif /* !(_ASM_SPARC64_PARPORT_H */ 247