1 /* central.c: Central FHC driver for Sunfire/Starfire/Wildfire. 2 * 3 * Copyright (C) 1997, 1999, 2008 David S. Miller (davem@davemloft.net) 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/types.h> 8 #include <linux/slab.h> 9 #include <linux/export.h> 10 #include <linux/string.h> 11 #include <linux/init.h> 12 #include <linux/of_device.h> 13 #include <linux/platform_device.h> 14 15 #include <asm/fhc.h> 16 #include <asm/upa.h> 17 18 struct clock_board { 19 void __iomem *clock_freq_regs; 20 void __iomem *clock_regs; 21 void __iomem *clock_ver_reg; 22 int num_slots; 23 struct resource leds_resource; 24 struct platform_device leds_pdev; 25 }; 26 27 struct fhc { 28 void __iomem *pregs; 29 bool central; 30 bool jtag_master; 31 int board_num; 32 struct resource leds_resource; 33 struct platform_device leds_pdev; 34 }; 35 36 static int clock_board_calc_nslots(struct clock_board *p) 37 { 38 u8 reg = upa_readb(p->clock_regs + CLOCK_STAT1) & 0xc0; 39 40 switch (reg) { 41 case 0x40: 42 return 16; 43 44 case 0xc0: 45 return 8; 46 47 case 0x80: 48 reg = 0; 49 if (p->clock_ver_reg) 50 reg = upa_readb(p->clock_ver_reg); 51 if (reg) { 52 if (reg & 0x80) 53 return 4; 54 else 55 return 5; 56 } 57 /* Fallthrough */ 58 default: 59 return 4; 60 } 61 } 62 63 static int clock_board_probe(struct platform_device *op) 64 { 65 struct clock_board *p = kzalloc(sizeof(*p), GFP_KERNEL); 66 int err = -ENOMEM; 67 68 if (!p) { 69 printk(KERN_ERR "clock_board: Cannot allocate struct clock_board\n"); 70 goto out; 71 } 72 73 p->clock_freq_regs = of_ioremap(&op->resource[0], 0, 74 resource_size(&op->resource[0]), 75 "clock_board_freq"); 76 if (!p->clock_freq_regs) { 77 printk(KERN_ERR "clock_board: Cannot map clock_freq_regs\n"); 78 goto out_free; 79 } 80 81 p->clock_regs = of_ioremap(&op->resource[1], 0, 82 resource_size(&op->resource[1]), 83 "clock_board_regs"); 84 if (!p->clock_regs) { 85 printk(KERN_ERR "clock_board: Cannot map clock_regs\n"); 86 goto out_unmap_clock_freq_regs; 87 } 88 89 if (op->resource[2].flags) { 90 p->clock_ver_reg = of_ioremap(&op->resource[2], 0, 91 resource_size(&op->resource[2]), 92 "clock_ver_reg"); 93 if (!p->clock_ver_reg) { 94 printk(KERN_ERR "clock_board: Cannot map clock_ver_reg\n"); 95 goto out_unmap_clock_regs; 96 } 97 } 98 99 p->num_slots = clock_board_calc_nslots(p); 100 101 p->leds_resource.start = (unsigned long) 102 (p->clock_regs + CLOCK_CTRL); 103 p->leds_resource.end = p->leds_resource.start; 104 p->leds_resource.name = "leds"; 105 106 p->leds_pdev.name = "sunfire-clockboard-leds"; 107 p->leds_pdev.id = -1; 108 p->leds_pdev.resource = &p->leds_resource; 109 p->leds_pdev.num_resources = 1; 110 p->leds_pdev.dev.parent = &op->dev; 111 112 err = platform_device_register(&p->leds_pdev); 113 if (err) { 114 printk(KERN_ERR "clock_board: Could not register LEDS " 115 "platform device\n"); 116 goto out_unmap_clock_ver_reg; 117 } 118 119 printk(KERN_INFO "clock_board: Detected %d slot Enterprise system.\n", 120 p->num_slots); 121 122 err = 0; 123 out: 124 return err; 125 126 out_unmap_clock_ver_reg: 127 if (p->clock_ver_reg) 128 of_iounmap(&op->resource[2], p->clock_ver_reg, 129 resource_size(&op->resource[2])); 130 131 out_unmap_clock_regs: 132 of_iounmap(&op->resource[1], p->clock_regs, 133 resource_size(&op->resource[1])); 134 135 out_unmap_clock_freq_regs: 136 of_iounmap(&op->resource[0], p->clock_freq_regs, 137 resource_size(&op->resource[0])); 138 139 out_free: 140 kfree(p); 141 goto out; 142 } 143 144 static const struct of_device_id clock_board_match[] = { 145 { 146 .name = "clock-board", 147 }, 148 {}, 149 }; 150 151 static struct platform_driver clock_board_driver = { 152 .probe = clock_board_probe, 153 .driver = { 154 .name = "clock_board", 155 .of_match_table = clock_board_match, 156 }, 157 }; 158 159 static int fhc_probe(struct platform_device *op) 160 { 161 struct fhc *p = kzalloc(sizeof(*p), GFP_KERNEL); 162 int err = -ENOMEM; 163 u32 reg; 164 165 if (!p) { 166 printk(KERN_ERR "fhc: Cannot allocate struct fhc\n"); 167 goto out; 168 } 169 170 if (!strcmp(op->dev.of_node->parent->name, "central")) 171 p->central = true; 172 173 p->pregs = of_ioremap(&op->resource[0], 0, 174 resource_size(&op->resource[0]), 175 "fhc_pregs"); 176 if (!p->pregs) { 177 printk(KERN_ERR "fhc: Cannot map pregs\n"); 178 goto out_free; 179 } 180 181 if (p->central) { 182 reg = upa_readl(p->pregs + FHC_PREGS_BSR); 183 p->board_num = ((reg >> 16) & 1) | ((reg >> 12) & 0x0e); 184 } else { 185 p->board_num = of_getintprop_default(op->dev.of_node, "board#", -1); 186 if (p->board_num == -1) { 187 printk(KERN_ERR "fhc: No board# property\n"); 188 goto out_unmap_pregs; 189 } 190 if (upa_readl(p->pregs + FHC_PREGS_JCTRL) & FHC_JTAG_CTRL_MENAB) 191 p->jtag_master = true; 192 } 193 194 if (!p->central) { 195 p->leds_resource.start = (unsigned long) 196 (p->pregs + FHC_PREGS_CTRL); 197 p->leds_resource.end = p->leds_resource.start; 198 p->leds_resource.name = "leds"; 199 200 p->leds_pdev.name = "sunfire-fhc-leds"; 201 p->leds_pdev.id = p->board_num; 202 p->leds_pdev.resource = &p->leds_resource; 203 p->leds_pdev.num_resources = 1; 204 p->leds_pdev.dev.parent = &op->dev; 205 206 err = platform_device_register(&p->leds_pdev); 207 if (err) { 208 printk(KERN_ERR "fhc: Could not register LEDS " 209 "platform device\n"); 210 goto out_unmap_pregs; 211 } 212 } 213 reg = upa_readl(p->pregs + FHC_PREGS_CTRL); 214 215 if (!p->central) 216 reg |= FHC_CONTROL_IXIST; 217 218 reg &= ~(FHC_CONTROL_AOFF | 219 FHC_CONTROL_BOFF | 220 FHC_CONTROL_SLINE); 221 222 upa_writel(reg, p->pregs + FHC_PREGS_CTRL); 223 upa_readl(p->pregs + FHC_PREGS_CTRL); 224 225 reg = upa_readl(p->pregs + FHC_PREGS_ID); 226 printk(KERN_INFO "fhc: Board #%d, Version[%x] PartID[%x] Manuf[%x] %s\n", 227 p->board_num, 228 (reg & FHC_ID_VERS) >> 28, 229 (reg & FHC_ID_PARTID) >> 12, 230 (reg & FHC_ID_MANUF) >> 1, 231 (p->jtag_master ? 232 "(JTAG Master)" : 233 (p->central ? "(Central)" : ""))); 234 235 err = 0; 236 237 out: 238 return err; 239 240 out_unmap_pregs: 241 of_iounmap(&op->resource[0], p->pregs, resource_size(&op->resource[0])); 242 243 out_free: 244 kfree(p); 245 goto out; 246 } 247 248 static const struct of_device_id fhc_match[] = { 249 { 250 .name = "fhc", 251 }, 252 {}, 253 }; 254 255 static struct platform_driver fhc_driver = { 256 .probe = fhc_probe, 257 .driver = { 258 .name = "fhc", 259 .of_match_table = fhc_match, 260 }, 261 }; 262 263 static int __init sunfire_init(void) 264 { 265 (void) platform_driver_register(&fhc_driver); 266 (void) platform_driver_register(&clock_board_driver); 267 return 0; 268 } 269 270 fs_initcall(sunfire_init); 271