arch/powerpc/sysdev/cpm_common.c

   1 /*
   2  * Common CPM code
   3  *
   4  * Author: Scott Wood <scottwood@freescale.com>
   5  *
   6  * Copyright 2007-2008,2010 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/export.h>
  24 #include <linux/of.h>
  25 #include <linux/slab.h>
  26
  27 #include <asm/udbg.h>
  28 #include <asm/io.h>
  29 #include <asm/system.h>
  30 #include <asm/rheap.h>
  31 #include <asm/cpm.h>
  32
  33 #include <mm/mmu_decl.h>
  34
  35 #if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
  36 #include <linux/of_gpio.h>
  37 #endif
  38
  39 #ifdef CONFIG_PPC_EARLY_DEBUG_CPM
  40 static u32 __iomem *cpm_udbg_txdesc =
  41         (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;
  42
  43 static void udbg_putc_cpm(char c)
  44 {
  45         u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);
  46
  47         if (c == '\n')
  48                 udbg_putc_cpm('\r');
  49
  50         while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
  51                 ;
  52
  53         out_8(txbuf, c);
  54         out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
  55 }
  56
  57 void __init udbg_init_cpm(void)
  58 {
  59         if (cpm_udbg_txdesc) {
  60 #ifdef CONFIG_CPM2
  61                 setbat(1, 0xf0000000, 0xf0000000, 1024*1024, PAGE_KERNEL_NCG);
  62 #endif
  63                 udbg_putc = udbg_putc_cpm;
  64         }
  65 }
  66 #endif
  67
  68 static spinlock_t cpm_muram_lock;
  69 static rh_block_t cpm_boot_muram_rh_block[16];
  70 static rh_info_t cpm_muram_info;
  71 static u8 __iomem *muram_vbase;
  72 static phys_addr_t muram_pbase;
  73
  74 /* Max address size we deal with */
  75 #define OF_MAX_ADDR_CELLS       4
  76
  77 int cpm_muram_init(void)
  78 {
  79         struct device_node *np;
  80         struct resource r;
  81         u32 zero[OF_MAX_ADDR_CELLS] = {};
  82         resource_size_t max = 0;
  83         int i = 0;
  84         int ret = 0;
  85
  86         if (muram_pbase)
  87                 return 0;
  88
  89         spin_lock_init(&cpm_muram_lock);
  90         /* initialize the info header */
  91         rh_init(&cpm_muram_info, 1,
  92                 sizeof(cpm_boot_muram_rh_block) /
  93                 sizeof(cpm_boot_muram_rh_block[0]),
  94                 cpm_boot_muram_rh_block);
  95
  96         np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
  97         if (!np) {
  98                 /* try legacy bindings */
  99                 np = of_find_node_by_name(NULL, "data-only");
 100                 if (!np) {
 101                         printk(KERN_ERR "Cannot find CPM muram data node");
 102                         ret = -ENODEV;
 103                         goto out;
 104                 }
 105         }
 106
 107         muram_pbase = of_translate_address(np, zero);
 108         if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
 109                 printk(KERN_ERR "Cannot translate zero through CPM muram node");
 110                 ret = -ENODEV;
 111                 goto out;
 112         }
 113
 114         while (of_address_to_resource(np, i++, &r) == 0) {
 115                 if (r.end > max)
 116                         max = r.end;
 117
 118                 rh_attach_region(&cpm_muram_info, r.start - muram_pbase,
 119                                  resource_size(&r));
 120         }
 121
 122         muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
 123         if (!muram_vbase) {
 124                 printk(KERN_ERR "Cannot map CPM muram");
 125                 ret = -ENOMEM;
 126         }
 127
 128 out:
 129         of_node_put(np);
 130         return ret;
 131 }
 132
 133 /**
 134  * cpm_muram_alloc - allocate the requested size worth of multi-user ram
 135  * @size: number of bytes to allocate
 136  * @align: requested alignment, in bytes
 137  *
 138  * This function returns an offset into the muram area.
 139  * Use cpm_dpram_addr() to get the virtual address of the area.
 140  * Use cpm_muram_free() to free the allocation.
 141  */
 142 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
 143 {
 144         unsigned long start;
 145         unsigned long flags;
 146
 147         spin_lock_irqsave(&cpm_muram_lock, flags);
 148         cpm_muram_info.alignment = align;
 149         start = rh_alloc(&cpm_muram_info, size, "commproc");
 150         memset(cpm_muram_addr(start), 0, size);
 151         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 152
 153         return start;
 154 }
 155 EXPORT_SYMBOL(cpm_muram_alloc);
 156
 157 /**
 158  * cpm_muram_free - free a chunk of multi-user ram
 159  * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
 160  */
 161 int cpm_muram_free(unsigned long offset)
 162 {
 163         int ret;
 164         unsigned long flags;
 165
 166         spin_lock_irqsave(&cpm_muram_lock, flags);
 167         ret = rh_free(&cpm_muram_info, offset);
 168         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 169
 170         return ret;
 171 }
 172 EXPORT_SYMBOL(cpm_muram_free);
 173
 174 /**
 175  * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
 176  * @offset: the offset into the muram area to reserve
 177  * @size: the number of bytes to reserve
 178  *
 179  * This function returns "start" on success, -ENOMEM on failure.
 180  * Use cpm_dpram_addr() to get the virtual address of the area.
 181  * Use cpm_muram_free() to free the allocation.
 182  */
 183 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
 184 {
 185         unsigned long start;
 186         unsigned long flags;
 187
 188         spin_lock_irqsave(&cpm_muram_lock, flags);
 189         cpm_muram_info.alignment = 1;
 190         start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc");
 191         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 192
 193         return start;
 194 }
 195 EXPORT_SYMBOL(cpm_muram_alloc_fixed);
 196
 197 /**
 198  * cpm_muram_addr - turn a muram offset into a virtual address
 199  * @offset: muram offset to convert
 200  */
 201 void __iomem *cpm_muram_addr(unsigned long offset)
 202 {
 203         return muram_vbase + offset;
 204 }
 205 EXPORT_SYMBOL(cpm_muram_addr);
 206
 207 unsigned long cpm_muram_offset(void __iomem *addr)
 208 {
 209         return addr - (void __iomem *)muram_vbase;
 210 }
 211 EXPORT_SYMBOL(cpm_muram_offset);
 212
 213 /**
 214  * cpm_muram_dma - turn a muram virtual address into a DMA address
 215  * @offset: virtual address from cpm_muram_addr() to convert
 216  */
 217 dma_addr_t cpm_muram_dma(void __iomem *addr)
 218 {
 219         return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
 220 }
 221 EXPORT_SYMBOL(cpm_muram_dma);
 222
 223 #if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
 224
 225 struct cpm2_ioports {
 226         u32 dir, par, sor, odr, dat;
 227         u32 res[3];
 228 };
 229
 230 struct cpm2_gpio32_chip {
 231         struct of_mm_gpio_chip mm_gc;
 232         spinlock_t lock;
 233
 234         /* shadowed data register to clear/set bits safely */
 235         u32 cpdata;
 236 };
 237
 238 static inline struct cpm2_gpio32_chip *
 239 to_cpm2_gpio32_chip(struct of_mm_gpio_chip *mm_gc)
 240 {
 241         return container_of(mm_gc, struct cpm2_gpio32_chip, mm_gc);
 242 }
 243
 244 static void cpm2_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc)
 245 {
 246         struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
 247         struct cpm2_ioports __iomem *iop = mm_gc->regs;
 248
 249         cpm2_gc->cpdata = in_be32(&iop->dat);
 250 }
 251
 252 static int cpm2_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
 253 {
 254         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 255         struct cpm2_ioports __iomem *iop = mm_gc->regs;
 256         u32 pin_mask;
 257
 258         pin_mask = 1 << (31 - gpio);
 259
 260         return !!(in_be32(&iop->dat) & pin_mask);
 261 }
 262
 263 static void __cpm2_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask,
 264         int value)
 265 {
 266         struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
 267         struct cpm2_ioports __iomem *iop = mm_gc->regs;
 268
 269         if (value)
 270                 cpm2_gc->cpdata |= pin_mask;
 271         else
 272                 cpm2_gc->cpdata &= ~pin_mask;
 273
 274         out_be32(&iop->dat, cpm2_gc->cpdata);
 275 }
 276
 277 static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
 278 {
 279         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 280         struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
 281         unsigned long flags;
 282         u32 pin_mask = 1 << (31 - gpio);
 283
 284         spin_lock_irqsave(&cpm2_gc->lock, flags);
 285
 286         __cpm2_gpio32_set(mm_gc, pin_mask, value);
 287
 288         spin_unlock_irqrestore(&cpm2_gc->lock, flags);
 289 }
 290
 291 static int cpm2_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 292 {
 293         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 294         struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
 295         struct cpm2_ioports __iomem *iop = mm_gc->regs;
 296         unsigned long flags;
 297         u32 pin_mask = 1 << (31 - gpio);
 298
 299         spin_lock_irqsave(&cpm2_gc->lock, flags);
 300
 301         setbits32(&iop->dir, pin_mask);
 302         __cpm2_gpio32_set(mm_gc, pin_mask, val);
 303
 304         spin_unlock_irqrestore(&cpm2_gc->lock, flags);
 305
 306         return 0;
 307 }
 308
 309 static int cpm2_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
 310 {
 311         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 312         struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc);
 313         struct cpm2_ioports __iomem *iop = mm_gc->regs;
 314         unsigned long flags;
 315         u32 pin_mask = 1 << (31 - gpio);
 316
 317         spin_lock_irqsave(&cpm2_gc->lock, flags);
 318
 319         clrbits32(&iop->dir, pin_mask);
 320
 321         spin_unlock_irqrestore(&cpm2_gc->lock, flags);
 322
 323         return 0;
 324 }
 325
 326 int cpm2_gpiochip_add32(struct device_node *np)
 327 {
 328         struct cpm2_gpio32_chip *cpm2_gc;
 329         struct of_mm_gpio_chip *mm_gc;
 330         struct gpio_chip *gc;
 331
 332         cpm2_gc = kzalloc(sizeof(*cpm2_gc), GFP_KERNEL);
 333         if (!cpm2_gc)
 334                 return -ENOMEM;
 335
 336         spin_lock_init(&cpm2_gc->lock);
 337
 338         mm_gc = &cpm2_gc->mm_gc;
 339         gc = &mm_gc->gc;
 340
 341         mm_gc->save_regs = cpm2_gpio32_save_regs;
 342         gc->ngpio = 32;
 343         gc->direction_input = cpm2_gpio32_dir_in;
 344         gc->direction_output = cpm2_gpio32_dir_out;
 345         gc->get = cpm2_gpio32_get;
 346         gc->set = cpm2_gpio32_set;
 347
 348         return of_mm_gpiochip_add(np, mm_gc);
 349 }
 350 #endif /* CONFIG_CPM2 || CONFIG_8xx_GPIO */