arch/powerpc/sysdev/cpm_common.c

   1 /*
   2  * Common CPM code
   3  *
   4  * Author: Scott Wood <scottwood@freescale.com>
   5  *
   6  * Copyright 2007 Freescale Semiconductor, Inc.
   7  *
   8  * Some parts derived from commproc.c/cpm2_common.c, which is:
   9  * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
  10  * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
  11  * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
  12  * 2006 (c) MontaVista Software, Inc.
  13  * Vitaly Bordug <vbordug@ru.mvista.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of version 2 of the GNU General Public License as
  17  * published by the Free Software Foundation.
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/of_device.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/of.h>
  24
  25 #include <asm/udbg.h>
  26 #include <asm/io.h>
  27 #include <asm/system.h>
  28 #include <asm/rheap.h>
  29 #include <asm/cpm.h>
  30
  31 #include <mm/mmu_decl.h>
  32
  33 #if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
  34 #include <linux/of_gpio.h>
  35 #endif
  36
  37 #ifdef CONFIG_PPC_EARLY_DEBUG_CPM
  38 static u32 __iomem *cpm_udbg_txdesc =
  39         (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;
  40
  41 static void udbg_putc_cpm(char c)
  42 {
  43         u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);
  44
  45         if (c == '\n')
  46                 udbg_putc_cpm('\r');
  47
  48         while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
  49                 ;
  50
  51         out_8(txbuf, c);
  52         out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
  53 }
  54
  55 void __init udbg_init_cpm(void)
  56 {
  57         if (cpm_udbg_txdesc) {
  58 #ifdef CONFIG_CPM2
  59                 setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO);
  60 #endif
  61                 udbg_putc = udbg_putc_cpm;
  62         }
  63 }
  64 #endif
  65
  66 static spinlock_t cpm_muram_lock;
  67 static rh_block_t cpm_boot_muram_rh_block[16];
  68 static rh_info_t cpm_muram_info;
  69 static u8 __iomem *muram_vbase;
  70 static phys_addr_t muram_pbase;
  71
  72 /* Max address size we deal with */
  73 #define OF_MAX_ADDR_CELLS       4
  74
  75 int __init cpm_muram_init(void)
  76 {
  77         struct device_node *np;
  78         struct resource r;
  79         u32 zero[OF_MAX_ADDR_CELLS] = {};
  80         resource_size_t max = 0;
  81         int i = 0;
  82         int ret = 0;
  83
  84         spin_lock_init(&cpm_muram_lock);
  85         /* initialize the info header */
  86         rh_init(&cpm_muram_info, 1,
  87                 sizeof(cpm_boot_muram_rh_block) /
  88                 sizeof(cpm_boot_muram_rh_block[0]),
  89                 cpm_boot_muram_rh_block);
  90
  91         np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
  92         if (!np) {
  93                 /* try legacy bindings */
  94                 np = of_find_node_by_name(NULL, "data-only");
  95                 if (!np) {
  96                         printk(KERN_ERR "Cannot find CPM muram data node");
  97                         ret = -ENODEV;
  98                         goto out;
  99                 }
 100         }
 101
 102         muram_pbase = of_translate_address(np, zero);
 103         if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
 104                 printk(KERN_ERR "Cannot translate zero through CPM muram node");
 105                 ret = -ENODEV;
 106                 goto out;
 107         }
 108
 109         while (of_address_to_resource(np, i++, &r) == 0) {
 110                 if (r.end > max)
 111                         max = r.end;
 112
 113                 rh_attach_region(&cpm_muram_info, r.start - muram_pbase,
 114                                  r.end - r.start + 1);
 115         }
 116
 117         muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
 118         if (!muram_vbase) {
 119                 printk(KERN_ERR "Cannot map CPM muram");
 120                 ret = -ENOMEM;
 121         }
 122
 123 out:
 124         of_node_put(np);
 125         return ret;
 126 }
 127
 128 /**
 129  * cpm_muram_alloc - allocate the requested size worth of multi-user ram
 130  * @size: number of bytes to allocate
 131  * @align: requested alignment, in bytes
 132  *
 133  * This function returns an offset into the muram area.
 134  * Use cpm_dpram_addr() to get the virtual address of the area.
 135  * Use cpm_muram_free() to free the allocation.
 136  */
 137 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
 138 {
 139         unsigned long start;
 140         unsigned long flags;
 141
 142         spin_lock_irqsave(&cpm_muram_lock, flags);
 143         cpm_muram_info.alignment = align;
 144         start = rh_alloc(&cpm_muram_info, size, "commproc");
 145         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 146
 147         return start;
 148 }
 149 EXPORT_SYMBOL(cpm_muram_alloc);
 150
 151 /**
 152  * cpm_muram_free - free a chunk of multi-user ram
 153  * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
 154  */
 155 int cpm_muram_free(unsigned long offset)
 156 {
 157         int ret;
 158         unsigned long flags;
 159
 160         spin_lock_irqsave(&cpm_muram_lock, flags);
 161         ret = rh_free(&cpm_muram_info, offset);
 162         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 163
 164         return ret;
 165 }
 166 EXPORT_SYMBOL(cpm_muram_free);
 167
 168 /**
 169  * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
 170  * @offset: the offset into the muram area to reserve
 171  * @size: the number of bytes to reserve
 172  *
 173  * This function returns "start" on success, -ENOMEM on failure.
 174  * Use cpm_dpram_addr() to get the virtual address of the area.
 175  * Use cpm_muram_free() to free the allocation.
 176  */
 177 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
 178 {
 179         unsigned long start;
 180         unsigned long flags;
 181
 182         spin_lock_irqsave(&cpm_muram_lock, flags);
 183         cpm_muram_info.alignment = 1;
 184         start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc");
 185         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 186
 187         return start;
 188 }
 189 EXPORT_SYMBOL(cpm_muram_alloc_fixed);
 190
 191 /**
 192  * cpm_muram_addr - turn a muram offset into a virtual address
 193  * @offset: muram offset to convert
 194  */
 195 void __iomem *cpm_muram_addr(unsigned long offset)
 196 {
 197         return muram_vbase + offset;
 198 }
 199 EXPORT_SYMBOL(cpm_muram_addr);
 200
 201 unsigned long cpm_muram_offset(void __iomem *addr)
 202 {
 203         return addr - (void __iomem *)muram_vbase;
 204 }
 205 EXPORT_SYMBOL(cpm_muram_offset);
 206
 207 /**
 208  * cpm_muram_dma - turn a muram virtual address into a DMA address
 209  * @offset: virtual address from cpm_muram_addr() to convert
 210  */
 211 dma_addr_t cpm_muram_dma(void __iomem *addr)
 212 {
 213         return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
 214 }
 215 EXPORT_SYMBOL(cpm_muram_dma);
 216
 217 #if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
 218
 219 struct cpm2_ioports {
 220         u32 dir, par, sor, odr, dat;
 221         u32 res[3];
 222 };
 223
 224 struct cpm2_gpio32_chip {
 225         struct of_mm_gpio_chip mm_gc;
 226         spinlock_t lock;
 227
 228         /* shadowed data register to clear/set bits safely */
 229         u32 cpdata;
 230 };
 231
 232 static inline struct cpm2_gpio32_chip *
 233 to_cpm2_gpio32_chip(struct of_mm_gpio_chip *mm_gc)
 234 {
 235         return container_of(mm_gc, struct cpm2_gpio32_chip, mm_gc);
 236 }
 237
 238 static void cpm2_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc)
 239 {
 240         struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
 241         struct cpm2_ioports __iomem *iop = mm_gc->regs;
 242
 243         cpm2_gc->cpdata = in_be32(&iop->dat);
 244 }
 245
 246 static int cpm2_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
 247 {
 248         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 249         struct cpm2_ioports __iomem *iop = mm_gc->regs;
 250         u32 pin_mask;
 251
 252         pin_mask = 1 << (31 - gpio);
 253
 254         return !!(in_be32(&iop->dat) & pin_mask);
 255 }
 256
 257 static void __cpm2_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask,
 258         int value)
 259 {
 260         struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
 261         struct cpm2_ioports __iomem *iop = mm_gc->regs;
 262
 263         if (value)
 264                 cpm2_gc->cpdata |= pin_mask;
 265         else
 266                 cpm2_gc->cpdata &= ~pin_mask;
 267
 268         out_be32(&iop->dat, cpm2_gc->cpdata);
 269 }
 270
 271 static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
 272 {
 273         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 274         struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
 275         unsigned long flags;
 276         u32 pin_mask = 1 << (31 - gpio);
 277
 278         spin_lock_irqsave(&cpm2_gc->lock, flags);
 279
 280         __cpm2_gpio32_set(mm_gc, pin_mask, value);
 281
 282         spin_unlock_irqrestore(&cpm2_gc->lock, flags);
 283 }
 284
 285 static int cpm2_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 286 {
 287         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 288         struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
 289         struct cpm2_ioports __iomem *iop = mm_gc->regs;
 290         unsigned long flags;
 291         u32 pin_mask = 1 << (31 - gpio);
 292
 293         spin_lock_irqsave(&cpm2_gc->lock, flags);
 294
 295         setbits32(&iop->dir, pin_mask);
 296         __cpm2_gpio32_set(mm_gc, pin_mask, val);
 297
 298         spin_unlock_irqrestore(&cpm2_gc->lock, flags);
 299
 300         return 0;
 301 }
 302
 303 static int cpm2_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
 304 {
 305         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 306         struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
 307         struct cpm2_ioports __iomem *iop = mm_gc->regs;
 308         unsigned long flags;
 309         u32 pin_mask = 1 << (31 - gpio);
 310
 311         spin_lock_irqsave(&cpm2_gc->lock, flags);
 312
 313         clrbits32(&iop->dir, pin_mask);
 314
 315         spin_unlock_irqrestore(&cpm2_gc->lock, flags);
 316
 317         return 0;
 318 }
 319
 320 int cpm2_gpiochip_add32(struct device_node *np)
 321 {
 322         struct cpm2_gpio32_chip *cpm2_gc;
 323         struct of_mm_gpio_chip *mm_gc;
 324         struct of_gpio_chip *of_gc;
 325         struct gpio_chip *gc;
 326
 327         cpm2_gc = kzalloc(sizeof(*cpm2_gc), GFP_KERNEL);
 328         if (!cpm2_gc)
 329                 return -ENOMEM;
 330
 331         spin_lock_init(&cpm2_gc->lock);
 332
 333         mm_gc = &cpm2_gc->mm_gc;
 334         of_gc = &mm_gc->of_gc;
 335         gc = &of_gc->gc;
 336
 337         mm_gc->save_regs = cpm2_gpio32_save_regs;
 338         of_gc->gpio_cells = 2;
 339         gc->ngpio = 32;
 340         gc->direction_input = cpm2_gpio32_dir_in;
 341         gc->direction_output = cpm2_gpio32_dir_out;
 342         gc->get = cpm2_gpio32_get;
 343         gc->set = cpm2_gpio32_set;
 344
 345         return of_mm_gpiochip_add(np, mm_gc);
 346 }
 347 #endif /* CONFIG_CPM2 || CONFIG_8xx_GPIO */