1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* parport.h: sparc64 specific parport initialization and dma. 3 * 4 * Copyright (C) 1999 Eddie C. Dost (ecd@skynet.be) 5 */ 6 7 #ifndef _ASM_SPARC64_PARPORT_H 8 #define _ASM_SPARC64_PARPORT_H 1 9 10 #include <linux/of.h> 11 #include <linux/platform_device.h> 12 13 #include <asm/ebus_dma.h> 14 #include <asm/ns87303.h> 15 #include <asm/prom.h> 16 17 #define PARPORT_PC_MAX_PORTS PARPORT_MAX 18 19 /* 20 * While sparc64 doesn't have an ISA DMA API, we provide something that looks 21 * close enough to make parport_pc happy 22 */ 23 #define HAS_DMA 24 25 #ifdef CONFIG_PARPORT_PC_FIFO 26 static DEFINE_SPINLOCK(dma_spin_lock); 27 28 #define claim_dma_lock() \ 29 ({ unsigned long flags; \ 30 spin_lock_irqsave(&dma_spin_lock, flags); \ 31 flags; \ 32 }) 33 34 #define release_dma_lock(__flags) \ 35 spin_unlock_irqrestore(&dma_spin_lock, __flags); 36 #endif 37 38 static struct sparc_ebus_info { 39 struct ebus_dma_info info; 40 unsigned int addr; 41 unsigned int count; 42 int lock; 43 44 struct parport *port; 45 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS]; 46 47 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS); 48 49 static inline int request_dma(unsigned int dmanr, const char *device_id) 50 { 51 if (dmanr >= PARPORT_PC_MAX_PORTS) 52 return -EINVAL; 53 if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0) 54 return -EBUSY; 55 return 0; 56 } 57 58 static inline void free_dma(unsigned int dmanr) 59 { 60 if (dmanr >= PARPORT_PC_MAX_PORTS) { 61 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr); 62 return; 63 } 64 if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) { 65 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr); 66 return; 67 } 68 } 69 70 static inline void enable_dma(unsigned int dmanr) 71 { 72 ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1); 73 74 if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info, 75 sparc_ebus_dmas[dmanr].addr, 76 sparc_ebus_dmas[dmanr].count)) 77 BUG(); 78 } 79 80 static inline void disable_dma(unsigned int dmanr) 81 { 82 ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0); 83 } 84 85 static inline void clear_dma_ff(unsigned int dmanr) 86 { 87 /* nothing */ 88 } 89 90 static inline void set_dma_mode(unsigned int dmanr, char mode) 91 { 92 ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE)); 93 } 94 95 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr) 96 { 97 sparc_ebus_dmas[dmanr].addr = addr; 98 } 99 100 static inline void set_dma_count(unsigned int dmanr, unsigned int count) 101 { 102 sparc_ebus_dmas[dmanr].count = count; 103 } 104 105 static inline unsigned int get_dma_residue(unsigned int dmanr) 106 { 107 return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info); 108 } 109 110 static int ecpp_probe(struct platform_device *op) 111 { 112 unsigned long base = op->resource[0].start; 113 unsigned long config = op->resource[1].start; 114 unsigned long d_base = op->resource[2].start; 115 unsigned long d_len; 116 struct device_node *parent; 117 struct parport *p; 118 int slot, err; 119 120 parent = op->dev.of_node->parent; 121 if (of_node_name_eq(parent, "dma")) { 122 p = parport_pc_probe_port(base, base + 0x400, 123 op->archdata.irqs[0], PARPORT_DMA_NOFIFO, 124 op->dev.parent->parent, 0); 125 if (!p) 126 return -ENOMEM; 127 dev_set_drvdata(&op->dev, p); 128 return 0; 129 } 130 131 for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) { 132 if (!test_and_set_bit(slot, dma_slot_map)) 133 break; 134 } 135 err = -ENODEV; 136 if (slot >= PARPORT_PC_MAX_PORTS) 137 goto out_err; 138 139 spin_lock_init(&sparc_ebus_dmas[slot].info.lock); 140 141 d_len = (op->resource[2].end - d_base) + 1UL; 142 sparc_ebus_dmas[slot].info.regs = 143 of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA"); 144 145 if (!sparc_ebus_dmas[slot].info.regs) 146 goto out_clear_map; 147 148 sparc_ebus_dmas[slot].info.flags = 0; 149 sparc_ebus_dmas[slot].info.callback = NULL; 150 sparc_ebus_dmas[slot].info.client_cookie = NULL; 151 sparc_ebus_dmas[slot].info.irq = 0xdeadbeef; 152 strcpy(sparc_ebus_dmas[slot].info.name, "parport"); 153 if (ebus_dma_register(&sparc_ebus_dmas[slot].info)) 154 goto out_unmap_regs; 155 156 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1); 157 158 /* Configure IRQ to Push Pull, Level Low */ 159 /* Enable ECP, set bit 2 of the CTR first */ 160 outb(0x04, base + 0x02); 161 ns87303_modify(config, PCR, 162 PCR_EPP_ENABLE | 163 PCR_IRQ_ODRAIN, 164 PCR_ECP_ENABLE | 165 PCR_ECP_CLK_ENA | 166 PCR_IRQ_POLAR); 167 168 /* CTR bit 5 controls direction of port */ 169 ns87303_modify(config, PTR, 170 0, PTR_LPT_REG_DIR); 171 172 p = parport_pc_probe_port(base, base + 0x400, 173 op->archdata.irqs[0], 174 slot, 175 op->dev.parent, 176 0); 177 err = -ENOMEM; 178 if (!p) 179 goto out_disable_irq; 180 181 dev_set_drvdata(&op->dev, p); 182 183 return 0; 184 185 out_disable_irq: 186 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); 187 ebus_dma_unregister(&sparc_ebus_dmas[slot].info); 188 189 out_unmap_regs: 190 of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len); 191 192 out_clear_map: 193 clear_bit(slot, dma_slot_map); 194 195 out_err: 196 return err; 197 } 198 199 static void ecpp_remove(struct platform_device *op) 200 { 201 struct parport *p = dev_get_drvdata(&op->dev); 202 int slot = p->dma; 203 204 parport_pc_unregister_port(p); 205 206 if (slot != PARPORT_DMA_NOFIFO) { 207 unsigned long d_base = op->resource[2].start; 208 unsigned long d_len; 209 210 d_len = (op->resource[2].end - d_base) + 1UL; 211 212 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); 213 ebus_dma_unregister(&sparc_ebus_dmas[slot].info); 214 of_iounmap(&op->resource[2], 215 sparc_ebus_dmas[slot].info.regs, 216 d_len); 217 clear_bit(slot, dma_slot_map); 218 } 219 } 220 221 static const struct of_device_id ecpp_match[] = { 222 { 223 .name = "ecpp", 224 }, 225 { 226 .name = "parallel", 227 .compatible = "ecpp", 228 }, 229 { 230 .name = "parallel", 231 .compatible = "ns87317-ecpp", 232 }, 233 { 234 .name = "parallel", 235 .compatible = "pnpALI,1533,3", 236 }, 237 {}, 238 }; 239 240 static struct platform_driver ecpp_driver = { 241 .driver = { 242 .name = "ecpp", 243 .of_match_table = ecpp_match, 244 }, 245 .probe = ecpp_probe, 246 .remove_new = ecpp_remove, 247 }; 248 249 static int parport_pc_find_nonpci_ports(int autoirq, int autodma) 250 { 251 return platform_driver_register(&ecpp_driver); 252 } 253 254 #endif /* !(_ASM_SPARC64_PARPORT_H */ 255