arch/powerpc/sysdev/fsl_soc.c

   1 /*
   2  * FSL SoC setup code
   3  *
   4  * Maintained by Kumar Gala (see MAINTAINERS for contact information)
   5  *
   6  * 2006 (c) MontaVista Software, Inc.
   7  * Vitaly Bordug <vbordug@ru.mvista.com>
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/errno.h>
  19 #include <linux/major.h>
  20 #include <linux/delay.h>
  21 #include <linux/irq.h>
  22 #include <linux/export.h>
  23 #include <linux/device.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/of.h>
  26 #include <linux/of_platform.h>
  27 #include <linux/phy.h>
  28 #include <linux/spi/spi.h>
  29 #include <linux/fsl_devices.h>
  30 #include <linux/fs_enet_pd.h>
  31 #include <linux/fs_uart_pd.h>
  32
  33 #include <linux/atomic.h>
  34 #include <asm/io.h>
  35 #include <asm/irq.h>
  36 #include <asm/time.h>
  37 #include <asm/prom.h>
  38 #include <asm/machdep.h>
  39 #include <sysdev/fsl_soc.h>
  40 #include <mm/mmu_decl.h>
  41 #include <asm/cpm2.h>
  42 #include <asm/fsl_hcalls.h>     /* For the Freescale hypervisor */
  43
  44 extern void init_fcc_ioports(struct fs_platform_info*);
  45 extern void init_fec_ioports(struct fs_platform_info*);
  46 extern void init_smc_ioports(struct fs_uart_platform_info*);
  47 static phys_addr_t immrbase = -1;
  48
  49 phys_addr_t get_immrbase(void)
  50 {
  51         struct device_node *soc;
  52
  53         if (immrbase != -1)
  54                 return immrbase;
  55
  56         soc = of_find_node_by_type(NULL, "soc");
  57         if (soc) {
  58                 int size;
  59                 u32 naddr;
  60                 const __be32 *prop = of_get_property(soc, "#address-cells", &size);
  61
  62                 if (prop && size == 4)
  63                         naddr = be32_to_cpup(prop);
  64                 else
  65                         naddr = 2;
  66
  67                 prop = of_get_property(soc, "ranges", &size);
  68                 if (prop)
  69                         immrbase = of_translate_address(soc, prop + naddr);
  70
  71                 of_node_put(soc);
  72         }
  73
  74         return immrbase;
  75 }
  76
  77 EXPORT_SYMBOL(get_immrbase);
  78
  79 static u32 sysfreq = -1;
  80
  81 u32 fsl_get_sys_freq(void)
  82 {
  83         struct device_node *soc;
  84         const u32 *prop;
  85         int size;
  86
  87         if (sysfreq != -1)
  88                 return sysfreq;
  89
  90         soc = of_find_node_by_type(NULL, "soc");
  91         if (!soc)
  92                 return -1;
  93
  94         prop = of_get_property(soc, "clock-frequency", &size);
  95         if (!prop || size != sizeof(*prop) || *prop == 0)
  96                 prop = of_get_property(soc, "bus-frequency", &size);
  97
  98         if (prop && size == sizeof(*prop))
  99                 sysfreq = *prop;
 100
 101         of_node_put(soc);
 102         return sysfreq;
 103 }
 104 EXPORT_SYMBOL(fsl_get_sys_freq);
 105
 106 #if defined(CONFIG_CPM2) || defined(CONFIG_QUICC_ENGINE) || defined(CONFIG_8xx)
 107
 108 static u32 brgfreq = -1;
 109
 110 u32 get_brgfreq(void)
 111 {
 112         struct device_node *node;
 113         const unsigned int *prop;
 114         int size;
 115
 116         if (brgfreq != -1)
 117                 return brgfreq;
 118
 119         node = of_find_compatible_node(NULL, NULL, "fsl,cpm-brg");
 120         if (node) {
 121                 prop = of_get_property(node, "clock-frequency", &size);
 122                 if (prop && size == 4)
 123                         brgfreq = *prop;
 124
 125                 of_node_put(node);
 126                 return brgfreq;
 127         }
 128
 129         /* Legacy device binding -- will go away when no users are left. */
 130         node = of_find_node_by_type(NULL, "cpm");
 131         if (!node)
 132                 node = of_find_compatible_node(NULL, NULL, "fsl,qe");
 133         if (!node)
 134                 node = of_find_node_by_type(NULL, "qe");
 135
 136         if (node) {
 137                 prop = of_get_property(node, "brg-frequency", &size);
 138                 if (prop && size == 4)
 139                         brgfreq = *prop;
 140
 141                 if (brgfreq == -1 || brgfreq == 0) {
 142                         prop = of_get_property(node, "bus-frequency", &size);
 143                         if (prop && size == 4)
 144                                 brgfreq = *prop / 2;
 145                 }
 146                 of_node_put(node);
 147         }
 148
 149         return brgfreq;
 150 }
 151
 152 EXPORT_SYMBOL(get_brgfreq);
 153
 154 static u32 fs_baudrate = -1;
 155
 156 u32 get_baudrate(void)
 157 {
 158         struct device_node *node;
 159
 160         if (fs_baudrate != -1)
 161                 return fs_baudrate;
 162
 163         node = of_find_node_by_type(NULL, "serial");
 164         if (node) {
 165                 int size;
 166                 const unsigned int *prop = of_get_property(node,
 167                                 "current-speed", &size);
 168
 169                 if (prop)
 170                         fs_baudrate = *prop;
 171                 of_node_put(node);
 172         }
 173
 174         return fs_baudrate;
 175 }
 176
 177 EXPORT_SYMBOL(get_baudrate);
 178 #endif /* CONFIG_CPM2 */
 179
 180 #if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
 181 static __be32 __iomem *rstcr;
 182
 183 static int __init setup_rstcr(void)
 184 {
 185         struct device_node *np;
 186
 187         for_each_node_by_name(np, "global-utilities") {
 188                 if ((of_get_property(np, "fsl,has-rstcr", NULL))) {
 189                         rstcr = of_iomap(np, 0) + 0xb0;
 190                         if (!rstcr)
 191                                 printk (KERN_ERR "Error: reset control "
 192                                                 "register not mapped!\n");
 193                         break;
 194                 }
 195         }
 196
 197         if (!rstcr && ppc_md.restart == fsl_rstcr_restart)
 198                 printk(KERN_ERR "No RSTCR register, warm reboot won't work\n");
 199
 200         if (np)
 201                 of_node_put(np);
 202
 203         return 0;
 204 }
 205
 206 arch_initcall(setup_rstcr);
 207
 208 void fsl_rstcr_restart(char *cmd)
 209 {
 210         local_irq_disable();
 211         if (rstcr)
 212                 /* set reset control register */
 213                 out_be32(rstcr, 0x2);   /* HRESET_REQ */
 214
 215         while (1) ;
 216 }
 217 #endif
 218
 219 #if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
 220 struct platform_diu_data_ops diu_ops;
 221 EXPORT_SYMBOL(diu_ops);
 222 #endif
 223
 224 #ifdef CONFIG_EPAPR_PARAVIRT
 225 /*
 226  * Restart the current partition
 227  *
 228  * This function should be assigned to the ppc_md.restart function pointer,
 229  * to initiate a partition restart when we're running under the Freescale
 230  * hypervisor.
 231  */
 232 void fsl_hv_restart(char *cmd)
 233 {
 234         pr_info("hv restart\n");
 235         fh_partition_restart(-1);
 236 }
 237
 238 /*
 239  * Halt the current partition
 240  *
 241  * This function should be assigned to the ppc_md.power_off and ppc_md.halt
 242  * function pointers, to shut down the partition when we're running under
 243  * the Freescale hypervisor.
 244  */
 245 void fsl_hv_halt(void)
 246 {
 247         pr_info("hv exit\n");
 248         fh_partition_stop(-1);
 249 }
 250 #endif