1 files changed, 509 insertions, 0 deletions

diff --git a/arch/sh/drivers/pci/pci-st40.c b/arch/sh/drivers/pci/pci-st40.c
new file mode 100644
index 000000000000..cb6752131156
--- /dev/null
+++ b/arch/sh/drivers/pci/pci-st40.c
@@ -0,0 +1,509 @@
+/* 
+ * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License.  See linux/COPYING for more information.                            
+ *
+ * Support functions for the ST40 PCI hardware.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/types.h>
+#include <asm/pci.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>    /* irqreturn_t */
+
+#include "pci-st40.h"
+
+/* This is in P2 of course */
+#define ST40PCI_BASE_ADDRESS     (0xb0000000)
+#define ST40PCI_MEM_ADDRESS      (ST40PCI_BASE_ADDRESS+0x0)
+#define ST40PCI_IO_ADDRESS       (ST40PCI_BASE_ADDRESS+0x06000000)
+#define ST40PCI_REG_ADDRESS      (ST40PCI_BASE_ADDRESS+0x07000000)
+
+#define ST40PCI_REG(x) (ST40PCI_REG_ADDRESS+(ST40PCI_##x))
+#define ST40PCI_REG_INDEXED(reg, index)                                 \
+        (ST40PCI_REG(reg##0) +                                  \
+          ((ST40PCI_REG(reg##1) - ST40PCI_REG(reg##0))*index))
+
+#define ST40PCI_WRITE(reg,val) writel((val),ST40PCI_REG(reg))
+#define ST40PCI_WRITE_SHORT(reg,val) writew((val),ST40PCI_REG(reg))
+#define ST40PCI_WRITE_BYTE(reg,val) writeb((val),ST40PCI_REG(reg))
+#define ST40PCI_WRITE_INDEXED(reg, index, val)                          \
+         writel((val), ST40PCI_REG_INDEXED(reg, index));
+
+#define ST40PCI_READ(reg) readl(ST40PCI_REG(reg))
+#define ST40PCI_READ_SHORT(reg) readw(ST40PCI_REG(reg))
+#define ST40PCI_READ_BYTE(reg) readb(ST40PCI_REG(reg))
+
+#define ST40PCI_SERR_IRQ        64
+#define ST40PCI_ERR_IRQ         65
+
+
+/* Macros to extract PLL params */
+#define PLL_MDIV(reg)  ( ((unsigned)reg) & 0xff )
+#define PLL_NDIV(reg) ( (((unsigned)reg)>>8) & 0xff )
+#define PLL_PDIV(reg) ( (((unsigned)reg)>>16) & 0x3 )
+#define PLL_SETUP(reg) ( (((unsigned)reg)>>19) & 0x1ff )
+
+/* Build up the appropriate settings */
+#define PLL_SET(mdiv,ndiv,pdiv,setup) \
+( ((mdiv)&0xff) | (((ndiv)&0xff)<<8) | (((pdiv)&3)<<16)| (((setup)&0x1ff)<<19))
+
+#define PLLPCICR (0xbb040000+0x10)
+
+#define PLLPCICR_POWERON (1<<28)
+#define PLLPCICR_OUT_EN (1<<29)
+#define PLLPCICR_LOCKSELECT (1<<30)
+#define PLLPCICR_LOCK (1<<31)
+
+
+#define PLL_25MHZ 0x793c8512
+#define PLL_33MHZ PLL_SET(18,88,3,295)
+
+static void pci_set_rbar_region(unsigned int region,     unsigned long localAddr,
+                         unsigned long pciOffset, unsigned long regionSize);
+
+/*
+ * The pcibios_map_platform_irq function is defined in the appropriate
+ * board specific code and referenced here
+ */
+extern int __init pcibios_map_platform_irq(struct pci_dev *dev, u8 slot, u8 pin);
+
+static __init void SetPCIPLL(void)
+{
+        {
+                /* Lets play with the PLL values */
+                unsigned long pll1cr1;
+                unsigned long mdiv, ndiv, pdiv;
+                unsigned long muxcr;
+                unsigned int muxcr_ratios[4] = { 8, 16, 21, 1 };
+                unsigned int freq;
+
+#define CLKGENA            0xbb040000
+#define CLKGENA_PLL2_MUXCR CLKGENA + 0x48
+                pll1cr1 = ctrl_inl(PLLPCICR);
+                printk("PLL1CR1 %08lx\n", pll1cr1);
+                mdiv = PLL_MDIV(pll1cr1);
+                ndiv = PLL_NDIV(pll1cr1);
+                pdiv = PLL_PDIV(pll1cr1);
+                printk("mdiv %02lx ndiv %02lx pdiv %02lx\n", mdiv, ndiv, pdiv);
+                freq = ((2*27*ndiv)/mdiv) / (1 << pdiv);
+                printk("PLL freq %dMHz\n", freq);
+                muxcr = ctrl_inl(CLKGENA_PLL2_MUXCR);
+                printk("PCI freq %dMhz\n", freq / muxcr_ratios[muxcr & 3]);
+        }
+}
+
+
+struct pci_err {
+  unsigned mask;
+  const char *error_string;
+};
+
+static struct pci_err int_error[]={
+  { INT_MNLTDIM,"MNLTDIM: Master non-lock transfer"},
+  { INT_TTADI,  "TTADI: Illegal byte enable in I/O transfer"},
+  { INT_TMTO,   "TMTO: Target memory read/write timeout"},
+  { INT_MDEI,   "MDEI: Master function disable error"},
+  { INT_APEDI,  "APEDI: Address parity error"},
+  { INT_SDI,    "SDI: SERR detected"},
+  { INT_DPEITW, "DPEITW: Data parity error target write"},
+  { INT_PEDITR, "PEDITR: PERR detected"},
+  { INT_TADIM,  "TADIM: Target abort detected"},
+  { INT_MADIM,  "MADIM: Master abort detected"},
+  { INT_MWPDI,  "MWPDI: PERR from target at data write"},
+  { INT_MRDPEI, "MRDPEI: Master read data parity error"}
+};
+#define NUM_PCI_INT_ERRS (sizeof(int_error)/sizeof(struct pci_err))
+
+static struct pci_err aint_error[]={
+  { AINT_MBI,   "MBI: Master broken"},
+  { AINT_TBTOI, "TBTOI: Target bus timeout"},
+  { AINT_MBTOI, "MBTOI: Master bus timeout"},
+  { AINT_TAI,   "TAI: Target abort"},
+  { AINT_MAI,   "MAI: Master abort"},
+  { AINT_RDPEI, "RDPEI: Read data parity"},
+  { AINT_WDPE,  "WDPE: Write data parity"}
+};
+
+#define NUM_PCI_AINT_ERRS (sizeof(aint_error)/sizeof(struct pci_err))
+
+static void print_pci_errors(unsigned reg,struct pci_err *error,int num_errors)
+{
+  int i;
+
+  for(i=0;i<num_errors;i++) {
+    if(reg & error[i].mask) {
+      printk("%s\n",error[i].error_string);
+    }
+  }
+
+}
+
+
+static char * pci_commands[16]={
+        "Int Ack",
+        "Special Cycle",
+        "I/O Read",
+        "I/O Write",
+        "Reserved",
+        "Reserved",
+        "Memory Read",
+        "Memory Write",
+        "Reserved",
+        "Reserved",
+        "Configuration Read",
+        "Configuration Write",
+        "Memory Read Multiple",
+        "Dual Address Cycle",
+        "Memory Read Line",
+        "Memory Write-and-Invalidate"
+};
+
+static irqreturn_t st40_pci_irq(int irq, void *dev_instance, struct pt_regs *regs)
+{
+        unsigned pci_int, pci_air, pci_cir, pci_aint;
+        static int count=0;
+
+
+        pci_int = ST40PCI_READ(INT);pci_aint = ST40PCI_READ(AINT);
+        pci_cir = ST40PCI_READ(CIR);pci_air = ST40PCI_READ(AIR);
+
+        /* Reset state to stop multiple interrupts */
+        ST40PCI_WRITE(INT, ~0); ST40PCI_WRITE(AINT, ~0);
+
+
+        if(++count>1) return IRQ_HANDLED;
+
+        printk("** PCI ERROR **\n");
+
+        if(pci_int) {
+                printk("** INT register status\n");
+                print_pci_errors(pci_int,int_error,NUM_PCI_INT_ERRS);
+        }
+
+        if(pci_aint) {
+                printk("** AINT register status\n");
+                print_pci_errors(pci_aint,aint_error,NUM_PCI_AINT_ERRS);
+        }
+
+        printk("** Address and command info\n");
+
+        printk("** Command  %s : Address 0x%x\n",
+               pci_commands[pci_cir&0xf],pci_air);
+
+        if(pci_cir&CIR_PIOTEM) {
+                printk("CIR_PIOTEM:PIO transfer error for master\n");
+        }
+        if(pci_cir&CIR_RWTET) {
+                printk("CIR_RWTET:Read/Write transfer error for target\n");
+        }
+
+        return IRQ_HANDLED;
+}
+
+
+/* Rounds a number UP to the nearest power of two. Used for
+ * sizing the PCI window.
+ */
+static u32 r2p2(u32 num)
+{
+        int i = 31;
+        u32 tmp = num;
+
+        if (num == 0)
+                return 0;
+
+        do {
+                if (tmp & (1 << 31))
+                        break;
+                i--;
+                tmp <<= 1;
+        } while (i >= 0);
+
+        tmp = 1 << i;
+        /* If the original number isn't a power of 2, round it up */
+        if (tmp != num)
+                tmp <<= 1;
+
+        return tmp;
+}
+
+static void __init pci_fixup_ide_bases(struct pci_dev *d)
+{
+        int i;
+
+        /*
+         * PCI IDE controllers use non-standard I/O port decoding, respect it.
+         */
+        if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
+                return;
+        printk("PCI: IDE base address fixup for %s\n", pci_name(d));
+        for(i=0; i<4; i++) {
+                struct resource *r = &d->resource[i];
+                if ((r->start & ~0x80) == 0x374) {
+                        r->start |= 2;
+                        r->end = r->start;
+                }
+        }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
+
+int __init st40pci_init(unsigned memStart, unsigned memSize)
+{
+        u32 lsr0;
+
+        SetPCIPLL();
+
+        /* Initialises the ST40 pci subsystem, performing a reset, then programming
+         * up the address space decoders appropriately
+         */
+
+        /* Should reset core here as well methink */
+
+        ST40PCI_WRITE(CR, CR_LOCK_MASK | CR_SOFT_RESET);
+
+        /* Loop while core resets */
+        while (ST40PCI_READ(CR) & CR_SOFT_RESET);
+
+        /* Switch off interrupts */
+        ST40PCI_WRITE(INTM, 0);
+        ST40PCI_WRITE(AINT, 0);
+
+        /* Now, lets reset all the cards on the bus with extreme prejudice */
+        ST40PCI_WRITE(CR, CR_LOCK_MASK | CR_RSTCTL);
+        udelay(250);
+
+        /* Set bus active, take it out of reset */
+        ST40PCI_WRITE(CR, CR_LOCK_MASK | CR_BMAM | CR_CFINT | CR_PFCS | CR_PFE);
+
+        /* The PCI spec says that no access must be made to the bus until 1 second
+         * after reset. This seem ludicrously long, but some delay is needed here
+         */
+        mdelay(1000);
+
+        /* Switch off interrupts */
+        ST40PCI_WRITE(INTM, 0);
+        ST40PCI_WRITE(AINT, 0);
+
+        /* Allow it to be a master */
+
+        ST40PCI_WRITE_SHORT(CSR_CMD,
+                            PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+                            PCI_COMMAND_IO);
+
+        /* Accesse to the 0xb0000000 -> 0xb6000000 area will go through to 0x10000000 -> 0x16000000
+         * on the PCI bus. This allows a nice 1-1 bus to phys mapping.
+         */
+
+
+        ST40PCI_WRITE(MBR, 0x10000000);
+        /* Always set the max size 128M (actually, it is only 96MB wide) */
+        ST40PCI_WRITE(MBMR, 0x07ff0000);
+
+        /* I/O addresses are mapped at 0xb6000000 -> 0xb7000000. These are changed to 0, to 
+         * allow cards that have legacy io such as vga to function correctly. This gives a 
+         * maximum of 64K of io/space as only the bottom 16 bits of the address are copied 
+         * over to the bus  when the transaction is made. 64K of io space is more than enough
+         */
+        ST40PCI_WRITE(IOBR, 0x0);
+        /* Set up the 64K window */
+        ST40PCI_WRITE(IOBMR, 0x0);
+
+        /* Now we set up the mbars so the PCI bus can see the local memory */
+        /* Expose a 256M window starting at PCI address 0... */
+        ST40PCI_WRITE(CSR_MBAR0, 0);
+        ST40PCI_WRITE(LSR0, 0x0fff0001);
+
+        /* ... and set up the initial incomming window to expose all of RAM */
+        pci_set_rbar_region(7, memStart, memStart, memSize);
+
+        /* Maximise timeout values */
+        ST40PCI_WRITE_BYTE(CSR_TRDY, 0xff);
+        ST40PCI_WRITE_BYTE(CSR_RETRY, 0xff);
+        ST40PCI_WRITE_BYTE(CSR_MIT, 0xff);
+
+        ST40PCI_WRITE_BYTE(PERF,PERF_MASTER_WRITE_POSTING);
+
+        return 1;
+}
+
+char * __init pcibios_setup(char *str)
+{
+        return str;
+}
+
+
+#define SET_CONFIG_BITS(bus,devfn,where)\
+  (((bus) << 16) | ((devfn) << 8) | ((where) & ~3) | (bus!=0))
+
+#define CONFIG_CMD(bus, devfn, where) SET_CONFIG_BITS(bus->number,devfn,where)
+
+
+static int CheckForMasterAbort(void)
+{
+        if (ST40PCI_READ(INT) & INT_MADIM) {
+                /* Should we clear config space version as well ??? */
+                ST40PCI_WRITE(INT, INT_MADIM);
+                ST40PCI_WRITE_SHORT(CSR_STATUS, 0);
+                return 1;
+        }
+
+        return 0;
+}
+
+/* Write to config register */
+static int st40pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val)
+{
+        ST40PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));
+        switch (size) {
+                case 1:
+                        *val = (u8)ST40PCI_READ_BYTE(PDR + (where & 3));
+                        break;
+                case 2:
+                        *val = (u16)ST40PCI_READ_SHORT(PDR + (where & 2));
+                        break;
+                case 4:
+                        *val = ST40PCI_READ(PDR);
+                        break;
+        }
+
+        if (CheckForMasterAbort()){
+                switch (size) {
+                        case 1:
+                                *val = (u8)0xff;
+                                break;
+                        case 2:
+                                *val = (u16)0xffff;
+                                break;
+                        case 4:
+                                *val = 0xffffffff;
+                                break;
+                }
+        }
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int st40pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
+{
+        ST40PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));
+
+        switch (size) {
+                case 1:
+                        ST40PCI_WRITE_BYTE(PDR + (where & 3), (u8)val);
+                        break;
+                case 2:
+                        ST40PCI_WRITE_SHORT(PDR + (where & 2), (u16)val);
+                        break;
+                case 4:
+                        ST40PCI_WRITE(PDR, val);
+                        break;
+        }
+
+        CheckForMasterAbort();
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops st40pci_config_ops = {
+        .read =         st40pci_read,
+        .write =        st40pci_write,
+};
+
+
+/* Everything hangs off this */
+static struct pci_bus *pci_root_bus;
+
+
+static u8 __init no_swizzle(struct pci_dev *dev, u8 * pin)
+{
+        return PCI_SLOT(dev->devfn);
+}
+
+
+static int __init pcibios_init(void)
+{
+        extern unsigned long memory_start, memory_end;
+
+        printk(KERN_ALERT "pci-st40.c: pcibios_init\n");
+
+        if (sh_mv.mv_init_pci != NULL) {
+                sh_mv.mv_init_pci();
+        }
+
+        /* The pci subsytem needs to know where memory is and how much 
+         * of it there is. I've simply made these globals. A better mechanism
+         * is probably needed.
+         */
+        st40pci_init(PHYSADDR(memory_start),
+                     PHYSADDR(memory_end) - PHYSADDR(memory_start));
+
+        if (request_irq(ST40PCI_ERR_IRQ, st40_pci_irq, 
+                        SA_INTERRUPT, "st40pci", NULL)) {
+                printk(KERN_ERR "st40pci: Cannot hook interrupt\n");
+                return -EIO;
+        }
+
+        /* Enable the PCI interrupts on the device */
+        ST40PCI_WRITE(INTM, ~0);
+        ST40PCI_WRITE(AINT, ~0);
+
+        /* Map the io address apprioately */
+#ifdef CONFIG_HD64465
+        hd64465_port_map(PCIBIOS_MIN_IO, (64 * 1024) - PCIBIOS_MIN_IO + 1,
+                         ST40_IO_ADDR + PCIBIOS_MIN_IO, 0);
+#endif
+
+        /* ok, do the scan man */
+        pci_root_bus = pci_scan_bus(0, &st40pci_config_ops, NULL);
+        pci_assign_unassigned_resources();
+        pci_fixup_irqs(no_swizzle, pcibios_map_platform_irq);
+
+        return 0;
+}
+
+subsys_initcall(pcibios_init);
+
+void __init pcibios_fixup_bus(struct pci_bus *bus)
+{
+}
+
+/*
+ * Publish a region of local address space over the PCI bus
+ * to other devices.
+ */
+static void pci_set_rbar_region(unsigned int region,     unsigned long localAddr,
+                         unsigned long pciOffset, unsigned long regionSize)
+{
+        unsigned long mask;
+
+        if (region > 7)
+                return;
+
+        if (regionSize > (512 * 1024 * 1024))
+                return;
+
+        mask = r2p2(regionSize) - 0x10000;
+
+        /* Diable the region (in case currently in use, should never happen) */
+        ST40PCI_WRITE_INDEXED(RSR, region, 0);
+
+        /* Start of local address space to publish */
+        ST40PCI_WRITE_INDEXED(RLAR, region, PHYSADDR(localAddr) );
+
+        /* Start of region in PCI address space as an offset from MBAR0 */
+        ST40PCI_WRITE_INDEXED(RBAR, region, pciOffset);
+
+        /* Size of region */
+        ST40PCI_WRITE_INDEXED(RSR, region, mask | 1);
+}
+