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commproc.c

/*
 * General Purpose functions for the global management of the
 * Communication Processor Module.
 * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
 *
 * In addition to the individual control of the communication
 * channels, there are a few functions that globally affect the
 * communication processor.
 *
 * Buffer descriptors must be allocated from the dual ported memory
 * space.  The allocator for that is here.  When the communication
 * process is reset, we reclaim the memory available.  There is
 * currently no deallocator for this memory.
 * The amount of space available is platform dependent.  On the
 * MBX, the EPPC software loads additional microcode into the
 * communication processor, and uses some of the DP ram for this
 * purpose.  Current, the first 512 bytes and the last 256 bytes of
 * memory are used.  Right now I am conservative and only use the
 * memory that can never be used for microcode.  If there are
 * applications that require more DP ram, we can expand the boundaries
 * but then we have to be careful of any downloaded microcode.
 */
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <asm/mpc8xx.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/8xx_immap.h>
#include <asm/commproc.h>
#include <asm/io.h>
#include <asm/tlbflush.h>
#include <asm/rheap.h>
#include <asm/prom.h>
#include <asm/cpm.h>

#include <asm/fs_pd.h>

#define CPM_MAP_SIZE    (0x4000)

#ifndef CONFIG_PPC_CPM_NEW_BINDING
static void m8xx_cpm_dpinit(void);
#endif
static uint host_buffer; /* One page of host buffer */
static uint host_end;    /* end + 1 */
cpm8xx_t __iomem *cpmp;  /* Pointer to comm processor space */
immap_t __iomem *mpc8xx_immr;
static cpic8xx_t __iomem *cpic_reg;

static struct irq_host *cpm_pic_host;

static void cpm_mask_irq(unsigned int irq)
{
      unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;

      clrbits32(&cpic_reg->cpic_cimr, (1 << cpm_vec));
}

static void cpm_unmask_irq(unsigned int irq)
{
      unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;

      setbits32(&cpic_reg->cpic_cimr, (1 << cpm_vec));
}

static void cpm_end_irq(unsigned int irq)
{
      unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;

      out_be32(&cpic_reg->cpic_cisr, (1 << cpm_vec));
}

static struct irq_chip cpm_pic = {
      .typename = " CPM PIC ",
      .mask = cpm_mask_irq,
      .unmask = cpm_unmask_irq,
      .eoi = cpm_end_irq,
};

int cpm_get_irq(void)
{
      int cpm_vec;

      /* Get the vector by setting the ACK bit and then reading
       * the register.
       */
      out_be16(&cpic_reg->cpic_civr, 1);
      cpm_vec = in_be16(&cpic_reg->cpic_civr);
      cpm_vec >>= 11;

      return irq_linear_revmap(cpm_pic_host, cpm_vec);
}

static int cpm_pic_host_map(struct irq_host *h, unsigned int virq,
                    irq_hw_number_t hw)
{
      pr_debug("cpm_pic_host_map(%d, 0x%lx)\n", virq, hw);

      get_irq_desc(virq)->status |= IRQ_LEVEL;
      set_irq_chip_and_handler(virq, &cpm_pic, handle_fasteoi_irq);
      return 0;
}

/* The CPM can generate the error interrupt when there is a race condition
 * between generating and masking interrupts.  All we have to do is ACK it
 * and return.  This is a no-op function so we don't need any special
 * tests in the interrupt handler.
 */
static irqreturn_t cpm_error_interrupt(int irq, void *dev)
{
      return IRQ_HANDLED;
}

static struct irqaction cpm_error_irqaction = {
      .handler = cpm_error_interrupt,
      .mask = CPU_MASK_NONE,
      .name = "error",
};

static struct irq_host_ops cpm_pic_host_ops = {
      .map = cpm_pic_host_map,
};

unsigned int cpm_pic_init(void)
{
      struct device_node *np = NULL;
      struct resource res;
      unsigned int sirq = NO_IRQ, hwirq, eirq;
      int ret;

      pr_debug("cpm_pic_init\n");

      np = of_find_compatible_node(NULL, NULL, "fsl,cpm1-pic");
      if (np == NULL)
            np = of_find_compatible_node(NULL, "cpm-pic", "CPM");
      if (np == NULL) {
            printk(KERN_ERR "CPM PIC init: can not find cpm-pic node\n");
            return sirq;
      }

      ret = of_address_to_resource(np, 0, &res);
      if (ret)
            goto end;

      cpic_reg = ioremap(res.start, res.end - res.start + 1);
      if (cpic_reg == NULL)
            goto end;

      sirq = irq_of_parse_and_map(np, 0);
      if (sirq == NO_IRQ)
            goto end;

      /* Initialize the CPM interrupt controller. */
      hwirq = (unsigned int)irq_map[sirq].hwirq;
      out_be32(&cpic_reg->cpic_cicr,
          (CICR_SCD_SCC4 | CICR_SCC_SCC3 | CICR_SCB_SCC2 | CICR_SCA_SCC1) |
            ((hwirq/2) << 13) | CICR_HP_MASK);

      out_be32(&cpic_reg->cpic_cimr, 0);

      cpm_pic_host = irq_alloc_host(of_node_get(np), IRQ_HOST_MAP_LINEAR,
                              64, &cpm_pic_host_ops, 64);
      if (cpm_pic_host == NULL) {
            printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
            sirq = NO_IRQ;
            goto end;
      }

      /* Install our own error handler. */
      np = of_find_compatible_node(NULL, NULL, "fsl,cpm1");
      if (np == NULL)
            np = of_find_node_by_type(NULL, "cpm");
      if (np == NULL) {
            printk(KERN_ERR "CPM PIC init: can not find cpm node\n");
            goto end;
      }

      eirq = irq_of_parse_and_map(np, 0);
      if (eirq == NO_IRQ)
            goto end;

      if (setup_irq(eirq, &cpm_error_irqaction))
            printk(KERN_ERR "Could not allocate CPM error IRQ!");

      setbits32(&cpic_reg->cpic_cicr, CICR_IEN);

end:
      of_node_put(np);
      return sirq;
}

void __init cpm_reset(void)
{
      sysconf8xx_t __iomem *siu_conf;

      mpc8xx_immr = ioremap(get_immrbase(), 0x4000);
      if (!mpc8xx_immr) {
            printk(KERN_CRIT "Could not map IMMR\n");
            return;
      }

      cpmp = &mpc8xx_immr->im_cpm;

#ifndef CONFIG_PPC_EARLY_DEBUG_CPM
      /* Perform a reset.
      */
      out_be16(&cpmp->cp_cpcr, CPM_CR_RST | CPM_CR_FLG);

      /* Wait for it.
      */
      while (in_be16(&cpmp->cp_cpcr) & CPM_CR_FLG);
#endif

#ifdef CONFIG_UCODE_PATCH
      cpm_load_patch(cpmp);
#endif

      /* Set SDMA Bus Request priority 5.
       * On 860T, this also enables FEC priority 6.  I am not sure
       * this is what we realy want for some applications, but the
       * manual recommends it.
       * Bit 25, FAM can also be set to use FEC aggressive mode (860T).
       */
      siu_conf = immr_map(im_siu_conf);
      out_be32(&siu_conf->sc_sdcr, 1);
      immr_unmap(siu_conf);

#ifdef CONFIG_PPC_CPM_NEW_BINDING
      cpm_muram_init();
#else
      /* Reclaim the DP memory for our use. */
      m8xx_cpm_dpinit();
#endif
}

/* We used to do this earlier, but have to postpone as long as possible
 * to ensure the kernel VM is now running.
 */
static void
alloc_host_memory(void)
{
      dma_addr_t  physaddr;

      /* Set the host page for allocation.
      */
      host_buffer = (uint)dma_alloc_coherent(NULL, PAGE_SIZE, &physaddr,
                  GFP_KERNEL);
      host_end = host_buffer + PAGE_SIZE;
}

/* We also own one page of host buffer space for the allocation of
 * UART "fifos" and the like.
 */
uint
m8xx_cpm_hostalloc(uint size)
{
      uint  retloc;

      if (host_buffer == 0)
            alloc_host_memory();

      if ((host_buffer + size) >= host_end)
            return(0);

      retloc = host_buffer;
      host_buffer += size;

      return(retloc);
}

/* Set a baud rate generator.  This needs lots of work.  There are
 * four BRGs, any of which can be wired to any channel.
 * The internal baud rate clock is the system clock divided by 16.
 * This assumes the baudrate is 16x oversampled by the uart.
 */
#define BRG_INT_CLK           (get_brgfreq())
#define BRG_UART_CLK          (BRG_INT_CLK/16)
#define BRG_UART_CLK_DIV16    (BRG_UART_CLK/16)

void
cpm_setbrg(uint brg, uint rate)
{
      u32 __iomem *bp;

      /* This is good enough to get SMCs running.....
      */
      bp = &cpmp->cp_brgc1;
      bp += brg;
      /* The BRG has a 12-bit counter.  For really slow baud rates (or
       * really fast processors), we may have to further divide by 16.
       */
      if (((BRG_UART_CLK / rate) - 1) < 4096)
            out_be32(bp, (((BRG_UART_CLK / rate) - 1) << 1) | CPM_BRG_EN);
      else
            out_be32(bp, (((BRG_UART_CLK_DIV16 / rate) - 1) << 1) |
                         CPM_BRG_EN | CPM_BRG_DIV16);
}

#ifndef CONFIG_PPC_CPM_NEW_BINDING
/*
 * dpalloc / dpfree bits.
 */
static spinlock_t cpm_dpmem_lock;
/*
 * 16 blocks should be enough to satisfy all requests
 * until the memory subsystem goes up...
 */
static rh_block_t cpm_boot_dpmem_rh_block[16];
static rh_info_t cpm_dpmem_info;

#define CPM_DPMEM_ALIGNMENT   8
static u8 __iomem *dpram_vbase;
static phys_addr_t dpram_pbase;

static void m8xx_cpm_dpinit(void)
{
      spin_lock_init(&cpm_dpmem_lock);

      dpram_vbase = cpmp->cp_dpmem;
      dpram_pbase = get_immrbase() + offsetof(immap_t, im_cpm.cp_dpmem);

      /* Initialize the info header */
      rh_init(&cpm_dpmem_info, CPM_DPMEM_ALIGNMENT,
                  sizeof(cpm_boot_dpmem_rh_block) /
                  sizeof(cpm_boot_dpmem_rh_block[0]),
                  cpm_boot_dpmem_rh_block);

      /*
       * Attach the usable dpmem area.
       * XXX: This is actually crap.  CPM_DATAONLY_BASE and
       * CPM_DATAONLY_SIZE are a subset of the available dparm.  It varies
       * with the processor and the microcode patches applied / activated.
       * But the following should be at least safe.
       */
      rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
}

/*
 * Allocate the requested size worth of DP memory.
 * This function returns an offset into the DPRAM area.
 * Use cpm_dpram_addr() to get the virtual address of the area.
 */
unsigned long cpm_dpalloc(uint size, uint align)
{
      unsigned long start;
      unsigned long flags;

      spin_lock_irqsave(&cpm_dpmem_lock, flags);
      cpm_dpmem_info.alignment = align;
      start = rh_alloc(&cpm_dpmem_info, size, "commproc");
      spin_unlock_irqrestore(&cpm_dpmem_lock, flags);

      return (uint)start;
}
EXPORT_SYMBOL(cpm_dpalloc);

int cpm_dpfree(unsigned long offset)
{
      int ret;
      unsigned long flags;

      spin_lock_irqsave(&cpm_dpmem_lock, flags);
      ret = rh_free(&cpm_dpmem_info, offset);
      spin_unlock_irqrestore(&cpm_dpmem_lock, flags);

      return ret;
}
EXPORT_SYMBOL(cpm_dpfree);

unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align)
{
      unsigned long start;
      unsigned long flags;

      spin_lock_irqsave(&cpm_dpmem_lock, flags);
      cpm_dpmem_info.alignment = align;
      start = rh_alloc_fixed(&cpm_dpmem_info, offset, size, "commproc");
      spin_unlock_irqrestore(&cpm_dpmem_lock, flags);

      return start;
}
EXPORT_SYMBOL(cpm_dpalloc_fixed);

void cpm_dpdump(void)
{
      rh_dump(&cpm_dpmem_info);
}
EXPORT_SYMBOL(cpm_dpdump);

void *cpm_dpram_addr(unsigned long offset)
{
      return (void *)(dpram_vbase + offset);
}
EXPORT_SYMBOL(cpm_dpram_addr);

uint cpm_dpram_phys(u8 *addr)
{
      return (dpram_pbase + (uint)(addr - dpram_vbase));
}
EXPORT_SYMBOL(cpm_dpram_phys);
#endif /* !CONFIG_PPC_CPM_NEW_BINDING */

struct cpm_ioport16 {
      __be16 dir, par, sor, dat, intr;
      __be16 res[3];
};

struct cpm_ioport32 {
      __be32 dir, par, sor;
};

static void cpm1_set_pin32(int port, int pin, int flags)
{
      struct cpm_ioport32 __iomem *iop;
      pin = 1 << (31 - pin);

      if (port == CPM_PORTB)
            iop = (struct cpm_ioport32 __iomem *)
                  &mpc8xx_immr->im_cpm.cp_pbdir;
      else
            iop = (struct cpm_ioport32 __iomem *)
                  &mpc8xx_immr->im_cpm.cp_pedir;

      if (flags & CPM_PIN_OUTPUT)
            setbits32(&iop->dir, pin);
      else
            clrbits32(&iop->dir, pin);

      if (!(flags & CPM_PIN_GPIO))
            setbits32(&iop->par, pin);
      else
            clrbits32(&iop->par, pin);

      if (port == CPM_PORTE) {
            if (flags & CPM_PIN_SECONDARY)
                  setbits32(&iop->sor, pin);
            else
                  clrbits32(&iop->sor, pin);

            if (flags & CPM_PIN_OPENDRAIN)
                  setbits32(&mpc8xx_immr->im_cpm.cp_peodr, pin);
            else
                  clrbits32(&mpc8xx_immr->im_cpm.cp_peodr, pin);
      }
}

static void cpm1_set_pin16(int port, int pin, int flags)
{
      struct cpm_ioport16 __iomem *iop =
            (struct cpm_ioport16 __iomem *)&mpc8xx_immr->im_ioport;

      pin = 1 << (15 - pin);

      if (port != 0)
            iop += port - 1;

      if (flags & CPM_PIN_OUTPUT)
            setbits16(&iop->dir, pin);
      else
            clrbits16(&iop->dir, pin);

      if (!(flags & CPM_PIN_GPIO))
            setbits16(&iop->par, pin);
      else
            clrbits16(&iop->par, pin);

      if (port == CPM_PORTC) {
            if (flags & CPM_PIN_SECONDARY)
                  setbits16(&iop->sor, pin);
            else
                  clrbits16(&iop->sor, pin);
      }
}

void cpm1_set_pin(enum cpm_port port, int pin, int flags)
{
      if (port == CPM_PORTB || port == CPM_PORTE)
            cpm1_set_pin32(port, pin, flags);
      else
            cpm1_set_pin16(port, pin, flags);
}

int cpm1_clk_setup(enum cpm_clk_target target, int clock, int mode)
{
      int shift;
      int i, bits = 0;
      u32 __iomem *reg;
      u32 mask = 7;

      u8 clk_map[][3] = {
            {CPM_CLK_SCC1, CPM_BRG1, 0},
            {CPM_CLK_SCC1, CPM_BRG2, 1},
            {CPM_CLK_SCC1, CPM_BRG3, 2},
            {CPM_CLK_SCC1, CPM_BRG4, 3},
            {CPM_CLK_SCC1, CPM_CLK1, 4},
            {CPM_CLK_SCC1, CPM_CLK2, 5},
            {CPM_CLK_SCC1, CPM_CLK3, 6},
            {CPM_CLK_SCC1, CPM_CLK4, 7},

            {CPM_CLK_SCC2, CPM_BRG1, 0},
            {CPM_CLK_SCC2, CPM_BRG2, 1},
            {CPM_CLK_SCC2, CPM_BRG3, 2},
            {CPM_CLK_SCC2, CPM_BRG4, 3},
            {CPM_CLK_SCC2, CPM_CLK1, 4},
            {CPM_CLK_SCC2, CPM_CLK2, 5},
            {CPM_CLK_SCC2, CPM_CLK3, 6},
            {CPM_CLK_SCC2, CPM_CLK4, 7},

            {CPM_CLK_SCC3, CPM_BRG1, 0},
            {CPM_CLK_SCC3, CPM_BRG2, 1},
            {CPM_CLK_SCC3, CPM_BRG3, 2},
            {CPM_CLK_SCC3, CPM_BRG4, 3},
            {CPM_CLK_SCC3, CPM_CLK5, 4},
            {CPM_CLK_SCC3, CPM_CLK6, 5},
            {CPM_CLK_SCC3, CPM_CLK7, 6},
            {CPM_CLK_SCC3, CPM_CLK8, 7},

            {CPM_CLK_SCC4, CPM_BRG1, 0},
            {CPM_CLK_SCC4, CPM_BRG2, 1},
            {CPM_CLK_SCC4, CPM_BRG3, 2},
            {CPM_CLK_SCC4, CPM_BRG4, 3},
            {CPM_CLK_SCC4, CPM_CLK5, 4},
            {CPM_CLK_SCC4, CPM_CLK6, 5},
            {CPM_CLK_SCC4, CPM_CLK7, 6},
            {CPM_CLK_SCC4, CPM_CLK8, 7},

            {CPM_CLK_SMC1, CPM_BRG1, 0},
            {CPM_CLK_SMC1, CPM_BRG2, 1},
            {CPM_CLK_SMC1, CPM_BRG3, 2},
            {CPM_CLK_SMC1, CPM_BRG4, 3},
            {CPM_CLK_SMC1, CPM_CLK1, 4},
            {CPM_CLK_SMC1, CPM_CLK2, 5},
            {CPM_CLK_SMC1, CPM_CLK3, 6},
            {CPM_CLK_SMC1, CPM_CLK4, 7},

            {CPM_CLK_SMC2, CPM_BRG1, 0},
            {CPM_CLK_SMC2, CPM_BRG2, 1},
            {CPM_CLK_SMC2, CPM_BRG3, 2},
            {CPM_CLK_SMC2, CPM_BRG4, 3},
            {CPM_CLK_SMC2, CPM_CLK5, 4},
            {CPM_CLK_SMC2, CPM_CLK6, 5},
            {CPM_CLK_SMC2, CPM_CLK7, 6},
            {CPM_CLK_SMC2, CPM_CLK8, 7},
      };

      switch (target) {
      case CPM_CLK_SCC1:
            reg = &mpc8xx_immr->im_cpm.cp_sicr;
            shift = 0;
            break;

      case CPM_CLK_SCC2:
            reg = &mpc8xx_immr->im_cpm.cp_sicr;
            shift = 8;
            break;

      case CPM_CLK_SCC3:
            reg = &mpc8xx_immr->im_cpm.cp_sicr;
            shift = 16;
            break;

      case CPM_CLK_SCC4:
            reg = &mpc8xx_immr->im_cpm.cp_sicr;
            shift = 24;
            break;

      case CPM_CLK_SMC1:
            reg = &mpc8xx_immr->im_cpm.cp_simode;
            shift = 12;
            break;

      case CPM_CLK_SMC2:
            reg = &mpc8xx_immr->im_cpm.cp_simode;
            shift = 28;
            break;

      default:
            printk(KERN_ERR "cpm1_clock_setup: invalid clock target\n");
            return -EINVAL;
      }

      if (reg == &mpc8xx_immr->im_cpm.cp_sicr && mode == CPM_CLK_RX)
            shift += 3;

      for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
            if (clk_map[i][0] == target && clk_map[i][1] == clock) {
                  bits = clk_map[i][2];
                  break;
            }
      }

      if (i == ARRAY_SIZE(clk_map)) {
            printk(KERN_ERR "cpm1_clock_setup: invalid clock combination\n");
            return -EINVAL;
      }

      bits <<= shift;
      mask <<= shift;
      out_be32(reg, (in_be32(reg) & ~mask) | bits);

      return 0;
}

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