arch/xtensa/platforms/xtfpga/setup.c

   1 /*
   2  *
   3  * arch/xtensa/platform/xtavnet/setup.c
   4  *
   5  * ...
   6  *
   7  * Authors:     Chris Zankel <chris@zankel.net>
   8  *              Joe Taylor <joe@tensilica.com>
   9  *
  10  * Copyright 2001 - 2006 Tensilica Inc.
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  *
  17  */
  18 #include <linux/stddef.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/errno.h>
  22 #include <linux/reboot.h>
  23 #include <linux/kdev_t.h>
  24 #include <linux/types.h>
  25 #include <linux/major.h>
  26 #include <linux/console.h>
  27 #include <linux/delay.h>
  28 #include <linux/of.h>
  29
  30 #include <asm/timex.h>
  31 #include <asm/processor.h>
  32 #include <asm/platform.h>
  33 #include <asm/bootparam.h>
  34 #include <platform/lcd.h>
  35 #include <platform/hardware.h>
  36
  37 void platform_halt(void)
  38 {
  39         lcd_disp_at_pos(" HALT ", 0);
  40         local_irq_disable();
  41         while (1)
  42                 cpu_relax();
  43 }
  44
  45 void platform_power_off(void)
  46 {
  47         lcd_disp_at_pos("POWEROFF", 0);
  48         local_irq_disable();
  49         while (1)
  50                 cpu_relax();
  51 }
  52
  53 void platform_restart(void)
  54 {
  55         /* Flush and reset the mmu, simulate a processor reset, and
  56          * jump to the reset vector. */
  57
  58
  59         __asm__ __volatile__ ("movi     a2, 15\n\t"
  60                               "wsr      a2, icountlevel\n\t"
  61                               "movi     a2, 0\n\t"
  62                               "wsr      a2, icount\n\t"
  63 #if XCHAL_NUM_IBREAK > 0
  64                               "wsr      a2, ibreakenable\n\t"
  65 #endif
  66                               "wsr      a2, lcount\n\t"
  67                               "movi     a2, 0x1f\n\t"
  68                               "wsr      a2, ps\n\t"
  69                               "isync\n\t"
  70                               "jx       %0\n\t"
  71                               :
  72                               : "a" (XCHAL_RESET_VECTOR_VADDR)
  73                               : "a2"
  74                               );
  75
  76         /* control never gets here */
  77 }
  78
  79 void __init platform_setup(char **cmdline)
  80 {
  81 }
  82
  83 #ifdef CONFIG_OF
  84
  85 static void __init update_clock_frequency(struct device_node *node)
  86 {
  87         struct property *newfreq;
  88         u32 freq;
  89
  90         if (!of_property_read_u32(node, "clock-frequency", &freq) && freq != 0)
  91                 return;
  92
  93         newfreq = kzalloc(sizeof(*newfreq) + sizeof(u32), GFP_KERNEL);
  94         if (!newfreq)
  95                 return;
  96         newfreq->value = newfreq + 1;
  97         newfreq->length = sizeof(freq);
  98         newfreq->name = kstrdup("clock-frequency", GFP_KERNEL);
  99         if (!newfreq->name) {
 100                 kfree(newfreq);
 101                 return;
 102         }
 103
 104         *(u32 *)newfreq->value = cpu_to_be32(*(u32 *)XTFPGA_CLKFRQ_VADDR);
 105         of_update_property(node, newfreq);
 106 }
 107
 108 #define MAC_LEN 6
 109 static void __init update_local_mac(struct device_node *node)
 110 {
 111         struct property *newmac;
 112         const u8* macaddr;
 113         int prop_len;
 114
 115         macaddr = of_get_property(node, "local-mac-address", &prop_len);
 116         if (macaddr == NULL || prop_len != MAC_LEN)
 117                 return;
 118
 119         newmac = kzalloc(sizeof(*newmac) + MAC_LEN, GFP_KERNEL);
 120         if (newmac == NULL)
 121                 return;
 122
 123         newmac->value = newmac + 1;
 124         newmac->length = MAC_LEN;
 125         newmac->name = kstrdup("local-mac-address", GFP_KERNEL);
 126         if (newmac->name == NULL) {
 127                 kfree(newmac);
 128                 return;
 129         }
 130
 131         memcpy(newmac->value, macaddr, MAC_LEN);
 132         ((u8*)newmac->value)[5] = (*(u32*)DIP_SWITCHES_VADDR) & 0x3f;
 133         of_update_property(node, newmac);
 134 }
 135
 136 static int __init machine_setup(void)
 137 {
 138         struct device_node *serial;
 139         struct device_node *eth = NULL;
 140
 141         for_each_compatible_node(serial, NULL, "ns16550a")
 142                 update_clock_frequency(serial);
 143
 144         if ((eth = of_find_compatible_node(eth, NULL, "opencores,ethoc")))
 145                 update_local_mac(eth);
 146         return 0;
 147 }
 148 arch_initcall(machine_setup);
 149
 150 #endif
 151
 152 /* early initialization */
 153
 154 void __init platform_init(bp_tag_t *first)
 155 {
 156 }
 157
 158 /* Heartbeat. */
 159
 160 void platform_heartbeat(void)
 161 {
 162 }
 163
 164 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
 165
 166 void __init platform_calibrate_ccount(void)
 167 {
 168         long clk_freq = 0;
 169 #ifdef CONFIG_OF
 170         struct device_node *cpu =
 171                 of_find_compatible_node(NULL, NULL, "cdns,xtensa-cpu");
 172         if (cpu) {
 173                 u32 freq;
 174                 update_clock_frequency(cpu);
 175                 if (!of_property_read_u32(cpu, "clock-frequency", &freq))
 176                         clk_freq = freq;
 177         }
 178 #endif
 179         if (!clk_freq)
 180                 clk_freq = *(long *)XTFPGA_CLKFRQ_VADDR;
 181
 182         ccount_freq = clk_freq;
 183 }
 184
 185 #endif
 186
 187 #ifndef CONFIG_OF
 188
 189 #include <linux/serial_8250.h>
 190 #include <linux/if.h>
 191 #include <net/ethoc.h>
 192
 193 /*----------------------------------------------------------------------------
 194  *  Ethernet -- OpenCores Ethernet MAC (ethoc driver)
 195  */
 196
 197 static struct resource ethoc_res[] = {
 198         [0] = { /* register space */
 199                 .start = OETH_REGS_PADDR,
 200                 .end   = OETH_REGS_PADDR + OETH_REGS_SIZE - 1,
 201                 .flags = IORESOURCE_MEM,
 202         },
 203         [1] = { /* buffer space */
 204                 .start = OETH_SRAMBUFF_PADDR,
 205                 .end   = OETH_SRAMBUFF_PADDR + OETH_SRAMBUFF_SIZE - 1,
 206                 .flags = IORESOURCE_MEM,
 207         },
 208         [2] = { /* IRQ number */
 209                 .start = OETH_IRQ,
 210                 .end   = OETH_IRQ,
 211                 .flags = IORESOURCE_IRQ,
 212         },
 213 };
 214
 215 static struct ethoc_platform_data ethoc_pdata = {
 216         /*
 217          * The MAC address for these boards is 00:50:c2:13:6f:xx.
 218          * The last byte (here as zero) is read from the DIP switches on the
 219          * board.
 220          */
 221         .hwaddr = { 0x00, 0x50, 0xc2, 0x13, 0x6f, 0 },
 222         .phy_id = -1,
 223 };
 224
 225 static struct platform_device ethoc_device = {
 226         .name = "ethoc",
 227         .id = -1,
 228         .num_resources = ARRAY_SIZE(ethoc_res),
 229         .resource = ethoc_res,
 230         .dev = {
 231                 .platform_data = &ethoc_pdata,
 232         },
 233 };
 234
 235 /*----------------------------------------------------------------------------
 236  *  UART
 237  */
 238
 239 static struct resource serial_resource = {
 240         .start  = DUART16552_PADDR,
 241         .end    = DUART16552_PADDR + 0x1f,
 242         .flags  = IORESOURCE_MEM,
 243 };
 244
 245 static struct plat_serial8250_port serial_platform_data[] = {
 246         [0] = {
 247                 .mapbase        = DUART16552_PADDR,
 248                 .irq            = DUART16552_INTNUM,
 249                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
 250                                   UPF_IOREMAP,
 251                 .iotype         = UPIO_MEM32,
 252                 .regshift       = 2,
 253                 .uartclk        = 0,    /* set in xtavnet_init() */
 254         },
 255         { },
 256 };
 257
 258 static struct platform_device xtavnet_uart = {
 259         .name           = "serial8250",
 260         .id             = PLAT8250_DEV_PLATFORM,
 261         .dev            = {
 262                 .platform_data  = serial_platform_data,
 263         },
 264         .num_resources  = 1,
 265         .resource       = &serial_resource,
 266 };
 267
 268 /* platform devices */
 269 static struct platform_device *platform_devices[] __initdata = {
 270         &ethoc_device,
 271         &xtavnet_uart,
 272 };
 273
 274
 275 static int __init xtavnet_init(void)
 276 {
 277         /* Ethernet MAC address.  */
 278         ethoc_pdata.hwaddr[5] = *(u32 *)DIP_SWITCHES_VADDR;
 279
 280         /* Clock rate varies among FPGA bitstreams; board specific FPGA register
 281          * reports the actual clock rate.
 282          */
 283         serial_platform_data[0].uartclk = *(long *)XTFPGA_CLKFRQ_VADDR;
 284
 285
 286         /* register platform devices */
 287         platform_add_devices(platform_devices, ARRAY_SIZE(platform_devices));
 288
 289         /* ETHOC driver is a bit quiet; at least display Ethernet MAC, so user
 290          * knows whether they set it correctly on the DIP switches.
 291          */
 292         pr_info("XTFPGA: Ethernet MAC %pM\n", ethoc_pdata.hwaddr);
 293
 294         return 0;
 295 }
 296
 297 /*
 298  * Register to be done during do_initcalls().
 299  */
 300 arch_initcall(xtavnet_init);
 301
 302 #endif /* CONFIG_OF */