drivers/bcma/driver_chipcommon_b.c

   1 /*
   2  * Broadcom specific AMBA
   3  * ChipCommon B Unit driver
   4  *
   5  * Copyright 2014, Hauke Mehrtens <hauke@hauke-m.de>
   6  *
   7  * Licensed under the GNU/GPL. See COPYING for details.
   8  */
   9
  10 #include "bcma_private.h"
  11 #include <linux/export.h>
  12 #include <linux/bcma/bcma.h>
  13
  14 static bool bcma_wait_reg(struct bcma_bus *bus, void __iomem *addr, u32 mask,
  15                           u32 value, int timeout)
  16 {
  17         unsigned long deadline = jiffies + timeout;
  18         u32 val;
  19
  20         do {
  21                 val = readl(addr);
  22                 if ((val & mask) == value)
  23                         return true;
  24                 cpu_relax();
  25                 udelay(10);
  26         } while (!time_after_eq(jiffies, deadline));
  27
  28         bcma_err(bus, "Timeout waiting for register %p\n", addr);
  29
  30         return false;
  31 }
  32
  33 void bcma_chipco_b_mii_write(struct bcma_drv_cc_b *ccb, u32 offset, u32 value)
  34 {
  35         struct bcma_bus *bus = ccb->core->bus;
  36
  37         writel(offset, ccb->mii + 0x00);
  38         bcma_wait_reg(bus, ccb->mii + 0x00, 0x0100, 0x0000, 100);
  39         writel(value, ccb->mii + 0x04);
  40         bcma_wait_reg(bus, ccb->mii + 0x00, 0x0100, 0x0000, 100);
  41 }
  42 EXPORT_SYMBOL_GPL(bcma_chipco_b_mii_write);
  43
  44 int bcma_core_chipcommon_b_init(struct bcma_drv_cc_b *ccb)
  45 {
  46         if (ccb->setup_done)
  47                 return 0;
  48
  49         ccb->setup_done = 1;
  50         ccb->mii = ioremap_nocache(ccb->core->addr_s[1], BCMA_CORE_SIZE);
  51         if (!ccb->mii)
  52                 return -ENOMEM;
  53
  54         return 0;
  55 }
  56
  57 void bcma_core_chipcommon_b_free(struct bcma_drv_cc_b *ccb)
  58 {
  59         if (ccb->mii)
  60                 iounmap(ccb->mii);
  61 }