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/string.h> 10 #include <linux/init.h> 11 #include <linux/of_device.h> 12 #include <linux/platform_device.h> 13 14 #include <asm/fhc.h> 15 #include <asm/upa.h> 16 17 struct clock_board { 18 void __iomem *clock_freq_regs; 19 void __iomem *clock_regs; 20 void __iomem *clock_ver_reg; 21 int num_slots; 22 struct resource leds_resource; 23 struct platform_device leds_pdev; 24 }; 25 26 struct fhc { 27 void __iomem *pregs; 28 bool central; 29 bool jtag_master; 30 int board_num; 31 struct resource leds_resource; 32 struct platform_device leds_pdev; 33 }; 34 35 static int __devinit clock_board_calc_nslots(struct clock_board *p) 36 { 37 u8 reg = upa_readb(p->clock_regs + CLOCK_STAT1) & 0xc0; 38 39 switch (reg) { 40 case 0x40: 41 return 16; 42 43 case 0xc0: 44 return 8; 45 46 case 0x80: 47 reg = 0; 48 if (p->clock_ver_reg) 49 reg = upa_readb(p->clock_ver_reg); 50 if (reg) { 51 if (reg & 0x80) 52 return 4; 53 else 54 return 5; 55 } 56 /* Fallthrough */ 57 default: 58 return 4; 59 } 60 } 61 62 static int __devinit clock_board_probe(struct platform_device *op) 63 { 64 struct clock_board *p = kzalloc(sizeof(*p), GFP_KERNEL); 65 int err = -ENOMEM; 66 67 if (!p) { 68 printk(KERN_ERR "clock_board: Cannot allocate struct clock_board\n"); 69 goto out; 70 } 71 72 p->clock_freq_regs = of_ioremap(&op->resource[0], 0, 73 resource_size(&op->resource[0]), 74 "clock_board_freq"); 75 if (!p->clock_freq_regs) { 76 printk(KERN_ERR "clock_board: Cannot map clock_freq_regs\n"); 77 goto out_free; 78 } 79 80 p->clock_regs = of_ioremap(&op->resource[1], 0, 81 resource_size(&op->resource[1]), 82 "clock_board_regs"); 83 if (!p->clock_regs) { 84 printk(KERN_ERR "clock_board: Cannot map clock_regs\n"); 85 goto out_unmap_clock_freq_regs; 86 } 87 88 if (op->resource[2].flags) { 89 p->clock_ver_reg = of_ioremap(&op->resource[2], 0, 90 resource_size(&op->resource[2]), 91 "clock_ver_reg"); 92 if (!p->clock_ver_reg) { 93 printk(KERN_ERR "clock_board: Cannot map clock_ver_reg\n"); 94 goto out_unmap_clock_regs; 95 } 96 } 97 98 p->num_slots = clock_board_calc_nslots(p); 99 100 p->leds_resource.start = (unsigned long) 101 (p->clock_regs + CLOCK_CTRL); 102 p->leds_resource.end = p->leds_resource.start; 103 p->leds_resource.name = "leds"; 104 105 p->leds_pdev.name = "sunfire-clockboard-leds"; 106 p->leds_pdev.id = -1; 107 p->leds_pdev.resource = &p->leds_resource; 108 p->leds_pdev.num_resources = 1; 109 p->leds_pdev.dev.parent = &op->dev; 110 111 err = platform_device_register(&p->leds_pdev); 112 if (err) { 113 printk(KERN_ERR "clock_board: Could not register LEDS " 114 "platform device\n"); 115 goto out_unmap_clock_ver_reg; 116 } 117 118 printk(KERN_INFO "clock_board: Detected %d slot Enterprise system.\n", 119 p->num_slots); 120 121 err = 0; 122 out: 123 return err; 124 125 out_unmap_clock_ver_reg: 126 if (p->clock_ver_reg) 127 of_iounmap(&op->resource[2], p->clock_ver_reg, 128 resource_size(&op->resource[2])); 129 130 out_unmap_clock_regs: 131 of_iounmap(&op->resource[1], p->clock_regs, 132 resource_size(&op->resource[1])); 133 134 out_unmap_clock_freq_regs: 135 of_iounmap(&op->resource[0], p->clock_freq_regs, 136 resource_size(&op->resource[0])); 137 138 out_free: 139 kfree(p); 140 goto out; 141 } 142 143 static struct of_device_id __initdata clock_board_match[] = { 144 { 145 .name = "clock-board", 146 }, 147 {}, 148 }; 149 150 static struct platform_driver clock_board_driver = { 151 .probe = clock_board_probe, 152 .driver = { 153 .name = "clock_board", 154 .owner = THIS_MODULE, 155 .of_match_table = clock_board_match, 156 }, 157 }; 158 159 static int __devinit 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 struct of_device_id __initdata 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 .owner = THIS_MODULE, 260 .of_match_table = fhc_match, 261 }, 262 }; 263 264 static int __init sunfire_init(void) 265 { 266 (void) platform_driver_register(&fhc_driver); 267 (void) platform_driver_register(&clock_board_driver); 268 return 0; 269 } 270 271 subsys_initcall(sunfire_init); 272