arch/powerpc/platforms/85xx/sbc8560.c

   1 /*
   2  * Wind River SBC8560 setup and early boot code.
   3  *
   4  * Copyright 2007 Wind River Systems Inc.
   5  *
   6  * By Paul Gortmaker (see MAINTAINERS for contact information)
   7  *
   8  * Based largely on the MPC8560ADS support - Copyright 2005 Freescale Inc.
   9  *
  10  * This program is free software; you can redistribute  it and/or modify it
  11  * under  the terms of  the GNU General  Public License as published by the
  12  * Free Software Foundation;  either version 2 of the  License, or (at your
  13  * option) any later version.
  14  */
  15
  16 #include <linux/stddef.h>
  17 #include <linux/kernel.h>
  18 #include <linux/pci.h>
  19 #include <linux/kdev_t.h>
  20 #include <linux/delay.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/of_platform.h>
  23
  24 #include <asm/system.h>
  25 #include <asm/time.h>
  26 #include <asm/machdep.h>
  27 #include <asm/pci-bridge.h>
  28 #include <asm/mpic.h>
  29 #include <mm/mmu_decl.h>
  30 #include <asm/udbg.h>
  31
  32 #include <sysdev/fsl_soc.h>
  33 #include <sysdev/fsl_pci.h>
  34
  35 #ifdef CONFIG_CPM2
  36 #include <asm/cpm2.h>
  37 #include <sysdev/cpm2_pic.h>
  38 #endif
  39
  40 #ifdef CONFIG_CPM2
  41
  42 static void cpm2_cascade(unsigned int irq, struct irq_desc *desc)
  43 {
  44         struct irq_chip *chip = irq_desc_get_chip(desc);
  45         int cascade_irq;
  46
  47         while ((cascade_irq = cpm2_get_irq()) >= 0)
  48                 generic_handle_irq(cascade_irq);
  49
  50         chip->irq_eoi(&desc->irq_data);
  51 }
  52
  53 #endif /* CONFIG_CPM2 */
  54
  55 static void __init sbc8560_pic_init(void)
  56 {
  57         struct mpic *mpic;
  58         struct resource r;
  59         struct device_node *np = NULL;
  60 #ifdef CONFIG_CPM2
  61         int irq;
  62 #endif
  63
  64         np = of_find_node_by_type(np, "open-pic");
  65         if (!np) {
  66                 printk(KERN_ERR "Could not find open-pic node\n");
  67                 return;
  68         }
  69
  70         if (of_address_to_resource(np, 0, &r)) {
  71                 printk(KERN_ERR "Could not map mpic register space\n");
  72                 of_node_put(np);
  73                 return;
  74         }
  75
  76         mpic = mpic_alloc(np, r.start,
  77                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
  78                         0, 256, " OpenPIC  ");
  79         BUG_ON(mpic == NULL);
  80         of_node_put(np);
  81
  82         mpic_init(mpic);
  83
  84 #ifdef CONFIG_CPM2
  85         /* Setup CPM2 PIC */
  86         np = of_find_compatible_node(NULL, NULL, "fsl,cpm2-pic");
  87         if (np == NULL) {
  88                 printk(KERN_ERR "PIC init: can not find fsl,cpm2-pic node\n");
  89                 return;
  90         }
  91         irq = irq_of_parse_and_map(np, 0);
  92
  93         cpm2_pic_init(np);
  94         of_node_put(np);
  95         irq_set_chained_handler(irq, cpm2_cascade);
  96 #endif
  97 }
  98
  99 /*
 100  * Setup the architecture
 101  */
 102 #ifdef CONFIG_CPM2
 103 struct cpm_pin {
 104         int port, pin, flags;
 105 };
 106
 107 static const struct cpm_pin sbc8560_pins[] = {
 108         /* SCC1 */
 109         {3, 29, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 110         {3, 30, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
 111         {3, 31, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 112
 113         /* SCC2 */
 114         {3, 26, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 115         {3, 27, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 116         {3, 28, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 117
 118         /* FCC2 */
 119         {1, 18, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 120         {1, 19, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 121         {1, 20, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 122         {1, 21, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 123         {1, 22, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 124         {1, 23, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 125         {1, 24, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 126         {1, 25, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 127         {1, 26, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 128         {1, 27, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 129         {1, 28, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 130         {1, 29, CPM_PIN_OUTPUT | CPM_PIN_SECONDARY},
 131         {1, 30, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 132         {1, 31, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 133         {2, 18, CPM_PIN_INPUT | CPM_PIN_PRIMARY}, /* CLK14 */
 134         {2, 19, CPM_PIN_INPUT | CPM_PIN_PRIMARY}, /* CLK13 */
 135
 136         /* FCC3 */
 137         {1, 4, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 138         {1, 5, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 139         {1, 6, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 140         {1, 7, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 141         {1, 8, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 142         {1, 9, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 143         {1, 10, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 144         {1, 11, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 145         {1, 12, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 146         {1, 13, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 147         {1, 14, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 148         {1, 15, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
 149         {1, 16, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 150         {1, 17, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
 151         {2, 16, CPM_PIN_INPUT | CPM_PIN_SECONDARY}, /* CLK16 */
 152         {2, 17, CPM_PIN_INPUT | CPM_PIN_SECONDARY}, /* CLK15 */
 153 };
 154
 155 static void __init init_ioports(void)
 156 {
 157         int i;
 158
 159         for (i = 0; i < ARRAY_SIZE(sbc8560_pins); i++) {
 160                 const struct cpm_pin *pin = &sbc8560_pins[i];
 161                 cpm2_set_pin(pin->port, pin->pin, pin->flags);
 162         }
 163
 164         cpm2_clk_setup(CPM_CLK_SCC1, CPM_BRG1, CPM_CLK_RX);
 165         cpm2_clk_setup(CPM_CLK_SCC1, CPM_BRG1, CPM_CLK_TX);
 166         cpm2_clk_setup(CPM_CLK_SCC2, CPM_BRG2, CPM_CLK_RX);
 167         cpm2_clk_setup(CPM_CLK_SCC2, CPM_BRG2, CPM_CLK_TX);
 168         cpm2_clk_setup(CPM_CLK_FCC2, CPM_CLK13, CPM_CLK_RX);
 169         cpm2_clk_setup(CPM_CLK_FCC2, CPM_CLK14, CPM_CLK_TX);
 170         cpm2_clk_setup(CPM_CLK_FCC3, CPM_CLK15, CPM_CLK_RX);
 171         cpm2_clk_setup(CPM_CLK_FCC3, CPM_CLK16, CPM_CLK_TX);
 172 }
 173 #endif
 174
 175 static void __init sbc8560_setup_arch(void)
 176 {
 177 #ifdef CONFIG_PCI
 178         struct device_node *np;
 179 #endif
 180
 181         if (ppc_md.progress)
 182                 ppc_md.progress("sbc8560_setup_arch()", 0);
 183
 184 #ifdef CONFIG_CPM2
 185         cpm2_reset();
 186         init_ioports();
 187 #endif
 188
 189 #ifdef CONFIG_PCI
 190         for_each_compatible_node(np, "pci", "fsl,mpc8540-pci")
 191                 fsl_add_bridge(np, 1);
 192 #endif
 193 }
 194
 195 static void sbc8560_show_cpuinfo(struct seq_file *m)
 196 {
 197         uint pvid, svid, phid1;
 198
 199         pvid = mfspr(SPRN_PVR);
 200         svid = mfspr(SPRN_SVR);
 201
 202         seq_printf(m, "Vendor\t\t: Wind River\n");
 203         seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
 204         seq_printf(m, "SVR\t\t: 0x%x\n", svid);
 205
 206         /* Display cpu Pll setting */
 207         phid1 = mfspr(SPRN_HID1);
 208         seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));
 209 }
 210
 211 static struct of_device_id __initdata of_bus_ids[] = {
 212         { .name = "soc", },
 213         { .type = "soc", },
 214         { .name = "cpm", },
 215         { .name = "localbus", },
 216         { .compatible = "simple-bus", },
 217         { .compatible = "gianfar", },
 218         {},
 219 };
 220
 221 static int __init declare_of_platform_devices(void)
 222 {
 223         of_platform_bus_probe(NULL, of_bus_ids, NULL);
 224
 225         return 0;
 226 }
 227 machine_device_initcall(sbc8560, declare_of_platform_devices);
 228
 229 /*
 230  * Called very early, device-tree isn't unflattened
 231  */
 232 static int __init sbc8560_probe(void)
 233 {
 234         unsigned long root = of_get_flat_dt_root();
 235
 236         return of_flat_dt_is_compatible(root, "SBC8560");
 237 }
 238
 239 #ifdef CONFIG_RTC_DRV_M48T59
 240 static int __init sbc8560_rtc_init(void)
 241 {
 242         struct device_node *np;
 243         struct resource res;
 244         struct platform_device *rtc_dev;
 245
 246         np = of_find_compatible_node(NULL, NULL, "m48t59");
 247         if (np == NULL) {
 248                 printk("No RTC in DTB. Has it been eaten by wild dogs?\n");
 249                 return -ENODEV;
 250         }
 251
 252         of_address_to_resource(np, 0, &res);
 253         of_node_put(np);
 254
 255         printk("Found RTC (m48t59) at i/o 0x%x\n", res.start);
 256
 257         rtc_dev = platform_device_register_simple("rtc-m48t59", 0, &res, 1);
 258
 259         if (IS_ERR(rtc_dev)) {
 260                 printk("Registering sbc8560 RTC device failed\n");
 261                 return PTR_ERR(rtc_dev);
 262         }
 263
 264         return 0;
 265 }
 266
 267 arch_initcall(sbc8560_rtc_init);
 268
 269 #endif  /* M48T59 */
 270
 271 static __u8 __iomem *brstcr;
 272
 273 static int __init sbc8560_bdrstcr_init(void)
 274 {
 275         struct device_node *np;
 276         struct resource res;
 277
 278         np = of_find_compatible_node(NULL, NULL, "wrs,sbc8560-brstcr");
 279         if (np == NULL) {
 280                 printk(KERN_WARNING "sbc8560: No board specific RSTCR in DTB.\n");
 281                 return -ENODEV;
 282         }
 283
 284         of_address_to_resource(np, 0, &res);
 285
 286         printk(KERN_INFO "sbc8560: Found BRSTCR at i/o 0x%x\n", res.start);
 287
 288         brstcr = ioremap(res.start, resource_size(&res));
 289         if(!brstcr)
 290                 printk(KERN_WARNING "sbc8560: ioremap of brstcr failed.\n");
 291
 292         of_node_put(np);
 293
 294         return 0;
 295 }
 296
 297 arch_initcall(sbc8560_bdrstcr_init);
 298
 299 void sbc8560_rstcr_restart(char * cmd)
 300 {
 301         local_irq_disable();
 302         if(brstcr)
 303                 clrbits8(brstcr, 0x80);
 304
 305         while(1);
 306 }
 307
 308 define_machine(sbc8560) {
 309         .name                   = "SBC8560",
 310         .probe                  = sbc8560_probe,
 311         .setup_arch             = sbc8560_setup_arch,
 312         .init_IRQ               = sbc8560_pic_init,
 313         .show_cpuinfo           = sbc8560_show_cpuinfo,
 314         .get_irq                = mpic_get_irq,
 315         .restart                = sbc8560_rstcr_restart,
 316         .calibrate_decr         = generic_calibrate_decr,
 317         .progress               = udbg_progress,
 318 };