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 #include <linux/string.h> 13 14 #include <asm/ebus_dma.h> 15 #include <asm/ns87303.h> 16 #include <asm/prom.h> 17 18 #define PARPORT_PC_MAX_PORTS PARPORT_MAX 19 20 /* 21 * While sparc64 doesn't have an ISA DMA API, we provide something that looks 22 * close enough to make parport_pc happy 23 */ 24 #define HAS_DMA 25 26 #ifdef CONFIG_PARPORT_PC_FIFO 27 static DEFINE_SPINLOCK(dma_spin_lock); 28 29 #define claim_dma_lock() \ 30 ({ unsigned long flags; \ 31 spin_lock_irqsave(&dma_spin_lock, flags); \ 32 flags; \ 33 }) 34 35 #define release_dma_lock(__flags) \ 36 spin_unlock_irqrestore(&dma_spin_lock, __flags); 37 #endif 38 39 static struct sparc_ebus_info { 40 struct ebus_dma_info info; 41 unsigned int addr; 42 unsigned int count; 43 int lock; 44 45 struct parport *port; 46 } sparc_ebus_dmas[PARPORT_PC_MAX_PORTS]; 47 48 static DECLARE_BITMAP(dma_slot_map, PARPORT_PC_MAX_PORTS); 49 50 static inline int request_dma(unsigned int dmanr, const char *device_id) 51 { 52 if (dmanr >= PARPORT_PC_MAX_PORTS) 53 return -EINVAL; 54 if (xchg(&sparc_ebus_dmas[dmanr].lock, 1) != 0) 55 return -EBUSY; 56 return 0; 57 } 58 59 static inline void free_dma(unsigned int dmanr) 60 { 61 if (dmanr >= PARPORT_PC_MAX_PORTS) { 62 printk(KERN_WARNING "Trying to free DMA%d\n", dmanr); 63 return; 64 } 65 if (xchg(&sparc_ebus_dmas[dmanr].lock, 0) == 0) { 66 printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr); 67 return; 68 } 69 } 70 71 static inline void enable_dma(unsigned int dmanr) 72 { 73 ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1); 74 75 if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info, 76 sparc_ebus_dmas[dmanr].addr, 77 sparc_ebus_dmas[dmanr].count)) 78 BUG(); 79 } 80 81 static inline void disable_dma(unsigned int dmanr) 82 { 83 ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 0); 84 } 85 86 static inline void clear_dma_ff(unsigned int dmanr) 87 { 88 /* nothing */ 89 } 90 91 static inline void set_dma_mode(unsigned int dmanr, char mode) 92 { 93 ebus_dma_prepare(&sparc_ebus_dmas[dmanr].info, (mode != DMA_MODE_WRITE)); 94 } 95 96 static inline void set_dma_addr(unsigned int dmanr, unsigned int addr) 97 { 98 sparc_ebus_dmas[dmanr].addr = addr; 99 } 100 101 static inline void set_dma_count(unsigned int dmanr, unsigned int count) 102 { 103 sparc_ebus_dmas[dmanr].count = count; 104 } 105 106 static inline unsigned int get_dma_residue(unsigned int dmanr) 107 { 108 return ebus_dma_residue(&sparc_ebus_dmas[dmanr].info); 109 } 110 111 static int ecpp_probe(struct platform_device *op) 112 { 113 unsigned long base = op->resource[0].start; 114 unsigned long config = op->resource[1].start; 115 unsigned long d_base = op->resource[2].start; 116 unsigned long d_len; 117 struct device_node *parent; 118 struct parport *p; 119 int slot, err; 120 121 parent = op->dev.of_node->parent; 122 if (of_node_name_eq(parent, "dma")) { 123 p = parport_pc_probe_port(base, base + 0x400, 124 op->archdata.irqs[0], PARPORT_DMA_NOFIFO, 125 op->dev.parent->parent, 0); 126 if (!p) 127 return -ENOMEM; 128 dev_set_drvdata(&op->dev, p); 129 return 0; 130 } 131 132 for (slot = 0; slot < PARPORT_PC_MAX_PORTS; slot++) { 133 if (!test_and_set_bit(slot, dma_slot_map)) 134 break; 135 } 136 err = -ENODEV; 137 if (slot >= PARPORT_PC_MAX_PORTS) 138 goto out_err; 139 140 spin_lock_init(&sparc_ebus_dmas[slot].info.lock); 141 142 d_len = (op->resource[2].end - d_base) + 1UL; 143 sparc_ebus_dmas[slot].info.regs = 144 of_ioremap(&op->resource[2], 0, d_len, "ECPP DMA"); 145 146 if (!sparc_ebus_dmas[slot].info.regs) 147 goto out_clear_map; 148 149 sparc_ebus_dmas[slot].info.flags = 0; 150 sparc_ebus_dmas[slot].info.callback = NULL; 151 sparc_ebus_dmas[slot].info.client_cookie = NULL; 152 sparc_ebus_dmas[slot].info.irq = 0xdeadbeef; 153 strscpy(sparc_ebus_dmas[slot].info.name, "parport"); 154 if (ebus_dma_register(&sparc_ebus_dmas[slot].info)) 155 goto out_unmap_regs; 156 157 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 1); 158 159 /* Configure IRQ to Push Pull, Level Low */ 160 /* Enable ECP, set bit 2 of the CTR first */ 161 outb(0x04, base + 0x02); 162 ns87303_modify(config, PCR, 163 PCR_EPP_ENABLE | 164 PCR_IRQ_ODRAIN, 165 PCR_ECP_ENABLE | 166 PCR_ECP_CLK_ENA | 167 PCR_IRQ_POLAR); 168 169 /* CTR bit 5 controls direction of port */ 170 ns87303_modify(config, PTR, 171 0, PTR_LPT_REG_DIR); 172 173 p = parport_pc_probe_port(base, base + 0x400, 174 op->archdata.irqs[0], 175 slot, 176 op->dev.parent, 177 0); 178 err = -ENOMEM; 179 if (!p) 180 goto out_disable_irq; 181 182 dev_set_drvdata(&op->dev, p); 183 184 return 0; 185 186 out_disable_irq: 187 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); 188 ebus_dma_unregister(&sparc_ebus_dmas[slot].info); 189 190 out_unmap_regs: 191 of_iounmap(&op->resource[2], sparc_ebus_dmas[slot].info.regs, d_len); 192 193 out_clear_map: 194 clear_bit(slot, dma_slot_map); 195 196 out_err: 197 return err; 198 } 199 200 static void ecpp_remove(struct platform_device *op) 201 { 202 struct parport *p = dev_get_drvdata(&op->dev); 203 int slot = p->dma; 204 205 parport_pc_unregister_port(p); 206 207 if (slot != PARPORT_DMA_NOFIFO) { 208 unsigned long d_base = op->resource[2].start; 209 unsigned long d_len; 210 211 d_len = (op->resource[2].end - d_base) + 1UL; 212 213 ebus_dma_irq_enable(&sparc_ebus_dmas[slot].info, 0); 214 ebus_dma_unregister(&sparc_ebus_dmas[slot].info); 215 of_iounmap(&op->resource[2], 216 sparc_ebus_dmas[slot].info.regs, 217 d_len); 218 clear_bit(slot, dma_slot_map); 219 } 220 } 221 222 static const struct of_device_id ecpp_match[] = { 223 { 224 .name = "ecpp", 225 }, 226 { 227 .name = "parallel", 228 .compatible = "ecpp", 229 }, 230 { 231 .name = "parallel", 232 .compatible = "ns87317-ecpp", 233 }, 234 { 235 .name = "parallel", 236 .compatible = "pnpALI,1533,3", 237 }, 238 {}, 239 }; 240 241 static struct platform_driver ecpp_driver = { 242 .driver = { 243 .name = "ecpp", 244 .of_match_table = ecpp_match, 245 }, 246 .probe = ecpp_probe, 247 .remove = ecpp_remove, 248 }; 249 250 static int parport_pc_find_nonpci_ports(int autoirq, int autodma) 251 { 252 return platform_driver_register(&ecpp_driver); 253 } 254 255 #endif /* !(_ASM_SPARC64_PARPORT_H */ 256