core_cia.c

linux-2.6.15.6

	if (temp != 0) {
		printk("pci: failed tb register update test "
		       "(tag1 %#x != 0)\n", temp);
		goto failed;
	}
	temp = *(vip)CIA_IOC_TBn_PAGEm(0,0);
	if (temp != pte0) {
		printk("pci: failed tb register update test "
		       "(pte0 %#x != %#x)\n", temp, pte0);
		goto failed;
	}
	printk("pci: passed tb register update test\n");

	/* Second, verify we can actually do I/O through this entry.  */

	data0 = 0xdeadbeef;
	page[0] = data0;
	mcheck_expected(0) = 1;
	mcheck_taken(0) = 0;
	mb();
	temp = cia_readl(bus_addr);
	mb();
	mcheck_expected(0) = 0;
	mb();
	if (mcheck_taken(0)) {
		printk("pci: failed sg loopback i/o read test (mcheck)\n");
		goto failed;
	}
	if (temp != data0) {
		printk("pci: failed sg loopback i/o read test "
		       "(%#x != %#x)\n", temp, data0);
		goto failed;
	}
	printk("pci: passed sg loopback i/o read test\n");

	/* Third, try to invalidate the TLB.  */

	if (! use_tbia_try2) {
		cia_pci_tbi(arena->hose, 0, -1);
		temp = *(vip)CIA_IOC_TB_TAGn(0);
		if (temp & 1) {
			use_tbia_try2 = 1;
			printk("pci: failed tbia test; workaround available\n");
		} else {
			printk("pci: passed tbia test\n");
		}
	}

	/* Fourth, verify the TLB snoops the EV5's caches when
	   doing a tlb fill.  */

	data0 = 0x5adda15e;
	page[0] = data0;
	arena->ptes[4] = pte0;
	mcheck_expected(0) = 1;
	mcheck_taken(0) = 0;
	mb();
	temp = cia_readl(bus_addr + 4*PAGE_SIZE);
	mb();
	mcheck_expected(0) = 0;
	mb();
	if (mcheck_taken(0)) {
		printk("pci: failed pte write cache snoop test (mcheck)\n");
		goto failed;
	}
	if (temp != data0) {
		printk("pci: failed pte write cache snoop test "
		       "(%#x != %#x)\n", temp, data0);
		goto failed;
	}
	printk("pci: passed pte write cache snoop test\n");

	/* Fifth, verify that a previously invalid PTE entry gets
	   filled from the page table.  */

	data0 = 0xabcdef12;
	page[0] = data0;
	arena->ptes[5] = pte0;
	mcheck_expected(0) = 1;
	mcheck_taken(0) = 0;
	mb();
	temp = cia_readl(bus_addr + 5*PAGE_SIZE);
	mb();
	mcheck_expected(0) = 0;
	mb();
	if (mcheck_taken(0)) {
		printk("pci: failed valid tag invalid pte reload test "
		       "(mcheck; workaround available)\n");
		/* Work around this bug by aligning new allocations
		   on 4 page boundaries.  */
		arena->align_entry = 4;
	} else if (temp != data0) {
		printk("pci: failed valid tag invalid pte reload test "
		       "(%#x != %#x)\n", temp, data0);
		goto failed;
	} else {
		printk("pci: passed valid tag invalid pte reload test\n");
	}

	/* Sixth, verify machine checks are working.  Test invalid
	   pte under the same valid tag as we used above.  */

	mcheck_expected(0) = 1;
	mcheck_taken(0) = 0;
	mb();
	temp = cia_readl(bus_addr + 6*PAGE_SIZE);
	mb();
	mcheck_expected(0) = 0;
	mb();
	printk("pci: %s pci machine check test\n",
	       mcheck_taken(0) ? "passed" : "failed");

	/* Clean up after the tests.  */
	arena->ptes[4] = 0;
	arena->ptes[5] = 0;

	if (use_tbia_try2) {
		alpha_mv.mv_pci_tbi = cia_pci_tbi_try2;

		/* Tags 0-3 must be disabled if we use this workaraund. */
		wmb();
		*(vip)CIA_IOC_TB_TAGn(0) = 2;
		*(vip)CIA_IOC_TB_TAGn(1) = 2;
		*(vip)CIA_IOC_TB_TAGn(2) = 2;
		*(vip)CIA_IOC_TB_TAGn(3) = 2;

		printk("pci: tbia workaround enabled\n");
	}
	alpha_mv.mv_pci_tbi(arena->hose, 0, -1);

exit:
	/* unmap the bus addr */
	cia_iounmap(bus_addr);

	/* Restore normal PCI operation.  */
	mb();
	*(vip)CIA_IOC_CIA_CTRL = ctrl;
	mb();
	*(vip)CIA_IOC_CIA_CTRL;
	mb();
	return;

failed:
	printk("pci: disabling sg translation window\n");
	*(vip)CIA_IOC_PCI_W0_BASE = 0;
	*(vip)CIA_IOC_PCI_W1_BASE = 0;
	pci_isa_hose->sg_isa = NULL;
	alpha_mv.mv_pci_tbi = NULL;
	goto exit;
}

#if defined(ALPHA_RESTORE_SRM_SETUP)
/* Save CIA configuration data as the console had it set up.  */
struct 
{
    unsigned int hae_mem;
    unsigned int hae_io;
    unsigned int pci_dac_offset;
    unsigned int err_mask;
    unsigned int cia_ctrl;
    unsigned int cia_cnfg;
    struct {
	unsigned int w_base;
	unsigned int w_mask;
	unsigned int t_base;
    } window[4];
} saved_config __attribute((common));

void
cia_save_srm_settings(int is_pyxis)
{
	int i;

	/* Save some important registers. */
	saved_config.err_mask       = *(vip)CIA_IOC_ERR_MASK;
	saved_config.cia_ctrl       = *(vip)CIA_IOC_CIA_CTRL;
	saved_config.hae_mem        = *(vip)CIA_IOC_HAE_MEM;
	saved_config.hae_io         = *(vip)CIA_IOC_HAE_IO;
	saved_config.pci_dac_offset = *(vip)CIA_IOC_PCI_W_DAC;

	if (is_pyxis)
	    saved_config.cia_cnfg   = *(vip)CIA_IOC_CIA_CNFG;
	else
	    saved_config.cia_cnfg   = 0;

	/* Save DMA windows configuration. */
	for (i = 0; i < 4; i++) {
	    saved_config.window[i].w_base = *(vip)CIA_IOC_PCI_Wn_BASE(i);
	    saved_config.window[i].w_mask = *(vip)CIA_IOC_PCI_Wn_MASK(i);
	    saved_config.window[i].t_base = *(vip)CIA_IOC_PCI_Tn_BASE(i);
	}
	mb();
}

void
cia_restore_srm_settings(void)
{
	int i;

	for (i = 0; i < 4; i++) {
	    *(vip)CIA_IOC_PCI_Wn_BASE(i) = saved_config.window[i].w_base;
	    *(vip)CIA_IOC_PCI_Wn_MASK(i) = saved_config.window[i].w_mask;
	    *(vip)CIA_IOC_PCI_Tn_BASE(i) = saved_config.window[i].t_base;
	}

	*(vip)CIA_IOC_HAE_MEM   = saved_config.hae_mem;
	*(vip)CIA_IOC_HAE_IO    = saved_config.hae_io;
	*(vip)CIA_IOC_PCI_W_DAC = saved_config.pci_dac_offset;	
	*(vip)CIA_IOC_ERR_MASK  = saved_config.err_mask;
	*(vip)CIA_IOC_CIA_CTRL  = saved_config.cia_ctrl;

	if (saved_config.cia_cnfg) /* Must be pyxis. */
	    *(vip)CIA_IOC_CIA_CNFG  = saved_config.cia_cnfg;

	mb();
}
#else /* ALPHA_RESTORE_SRM_SETUP */
#define cia_save_srm_settings(p)	do {} while (0)
#define cia_restore_srm_settings()	do {} while (0)
#endif /* ALPHA_RESTORE_SRM_SETUP */


static void __init
do_init_arch(int is_pyxis)
{
	struct pci_controller *hose;
	int temp, cia_rev, tbia_window;

	cia_rev = *(vip)CIA_IOC_CIA_REV & CIA_REV_MASK;
	printk("pci: cia revision %d%s\n",
	       cia_rev, is_pyxis ? " (pyxis)" : "");

	if (alpha_using_srm)
		cia_save_srm_settings(is_pyxis);

	/* Set up error reporting.  */
	temp = *(vip)CIA_IOC_ERR_MASK;
	temp &= ~(CIA_ERR_CPU_PE | CIA_ERR_MEM_NEM | CIA_ERR_PA_PTE_INV
		  | CIA_ERR_RCVD_MAS_ABT | CIA_ERR_RCVD_TAR_ABT);
	*(vip)CIA_IOC_ERR_MASK = temp;

	/* Clear all currently pending errors.  */
	temp = *(vip)CIA_IOC_CIA_ERR;
	*(vip)CIA_IOC_CIA_ERR = temp;

	/* Turn on mchecks.  */
	temp = *(vip)CIA_IOC_CIA_CTRL;
	temp |= CIA_CTRL_FILL_ERR_EN | CIA_CTRL_MCHK_ERR_EN;
	*(vip)CIA_IOC_CIA_CTRL = temp;

	/* Clear the CFG register, which gets used for PCI config space
	   accesses.  That is the way we want to use it, and we do not
	   want to depend on what ARC or SRM might have left behind.  */
	*(vip)CIA_IOC_CFG = 0;
 
	/* Zero the HAEs.  */
	*(vip)CIA_IOC_HAE_MEM = 0;
	*(vip)CIA_IOC_HAE_IO = 0;

	/* For PYXIS, we always use BWX bus and i/o accesses.  To that end,
	   make sure they're enabled on the controller.  At the same time,
	   enable the monster window.  */
	if (is_pyxis) {
		temp = *(vip)CIA_IOC_CIA_CNFG;
		temp |= CIA_CNFG_IOA_BWEN | CIA_CNFG_PCI_MWEN;
		*(vip)CIA_IOC_CIA_CNFG = temp;
	}

	/* Synchronize with all previous changes.  */
	mb();
	*(vip)CIA_IOC_CIA_REV;

	/*
	 * Create our single hose.
	 */

	pci_isa_hose = hose = alloc_pci_controller();
	hose->io_space = &ioport_resource;
	hose->mem_space = &iomem_resource;
	hose->index = 0;

	if (! is_pyxis) {
		struct resource *hae_mem = alloc_resource();
		hose->mem_space = hae_mem;

		hae_mem->start = 0;
		hae_mem->end = CIA_MEM_R1_MASK;
		hae_mem->name = pci_hae0_name;
		hae_mem->flags = IORESOURCE_MEM;

		if (request_resource(&iomem_resource, hae_mem) < 0)
			printk(KERN_ERR "Failed to request HAE_MEM\n");

		hose->sparse_mem_base = CIA_SPARSE_MEM - IDENT_ADDR;
		hose->dense_mem_base = CIA_DENSE_MEM - IDENT_ADDR;
		hose->sparse_io_base = CIA_IO - IDENT_ADDR;
		hose->dense_io_base = 0;
	} else {
		hose->sparse_mem_base = 0;
		hose->dense_mem_base = CIA_BW_MEM - IDENT_ADDR;
		hose->sparse_io_base = 0;
		hose->dense_io_base = CIA_BW_IO - IDENT_ADDR;
	}

	/*
	 * Set up the PCI to main memory translation windows.
	 *
	 * Window 0 is S/G 8MB at 8MB (for isa)
	 * Window 1 is S/G 1MB at 768MB (for tbia) (unused for CIA rev 1)
	 * Window 2 is direct access 2GB at 2GB
	 * Window 3 is DAC access 4GB at 8GB (or S/G for tbia if CIA rev 1)
	 *
	 * ??? NetBSD hints that page tables must be aligned to 32K,
	 * possibly due to a hardware bug.  This is over-aligned
	 * from the 8K alignment one would expect for an 8MB window. 
	 * No description of what revisions affected.
	 */

	hose->sg_pci = NULL;
	hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000, 32768);

	__direct_map_base = 0x80000000;
	__direct_map_size = 0x80000000;

	*(vip)CIA_IOC_PCI_W0_BASE = hose->sg_isa->dma_base | 3;
	*(vip)CIA_IOC_PCI_W0_MASK = (hose->sg_isa->size - 1) & 0xfff00000;
	*(vip)CIA_IOC_PCI_T0_BASE = virt_to_phys(hose->sg_isa->ptes) >> 2;

	*(vip)CIA_IOC_PCI_W2_BASE = __direct_map_base | 1;
	*(vip)CIA_IOC_PCI_W2_MASK = (__direct_map_size - 1) & 0xfff00000;
	*(vip)CIA_IOC_PCI_T2_BASE = 0 >> 2;

	/* On PYXIS we have the monster window, selected by bit 40, so
	   there is no need for window3 to be enabled.

	   On CIA, we don't have true arbitrary addressing -- bits <39:32>
	   are compared against W_DAC.  We can, however, directly map 4GB,
	   which is better than before.  However, due to assumptions made
	   elsewhere, we should not claim that we support DAC unless that
	   4GB covers all of physical memory.

	   On CIA rev 1, apparently W1 and W2 can't be used for SG. 
	   At least, there are reports that it doesn't work for Alcor. 
	   In that case, we have no choice but to use W3 for the TBIA 
	   workaround, which means we can't use DAC at all. */ 

	tbia_window = 1;
	if (is_pyxis) {
		*(vip)CIA_IOC_PCI_W3_BASE = 0;
	} else if (cia_rev == 1) {
		*(vip)CIA_IOC_PCI_W1_BASE = 0;
		tbia_window = 3;
	} else if (max_low_pfn > (0x100000000UL >> PAGE_SHIFT)) {
		*(vip)CIA_IOC_PCI_W3_BASE = 0;
	} else {
		*(vip)CIA_IOC_PCI_W3_BASE = 0x00000000 | 1 | 8;
		*(vip)CIA_IOC_PCI_W3_MASK = 0xfff00000;
		*(vip)CIA_IOC_PCI_T3_BASE = 0 >> 2;

		alpha_mv.pci_dac_offset = 0x200000000UL;
		*(vip)CIA_IOC_PCI_W_DAC = alpha_mv.pci_dac_offset >> 32;
	}

	/* Prepare workaround for apparently broken tbia. */
	cia_prepare_tbia_workaround(tbia_window);
}

void __init
cia_init_arch(void)
{
	do_init_arch(0);
}

void __init
pyxis_init_arch(void)
{
	/* On pyxis machines we can precisely calculate the
	   CPU clock frequency using pyxis real time counter.
	   It's especially useful for SX164 with broken RTC.

	   Both CPU and chipset are driven by the single 16.666M
	   or 16.667M crystal oscillator. PYXIS_RT_COUNT clock is
	   66.66 MHz. -ink */

	unsigned int cc0, cc1;
	unsigned long pyxis_cc;

	__asm__ __volatile__ ("rpcc %0" : "=r"(cc0));
	pyxis_cc = *(vulp)PYXIS_RT_COUNT;
	do { } while(*(vulp)PYXIS_RT_COUNT - pyxis_cc < 4096);
	__asm__ __volatile__ ("rpcc %0" : "=r"(cc1));
	cc1 -= cc0;
	hwrpb->cycle_freq = ((cc1 >> 11) * 100000000UL) / 3;
	hwrpb_update_checksum(hwrpb);

	do_init_arch(1);
}

void
cia_kill_arch(int mode)
{
	if (alpha_using_srm)
		cia_restore_srm_settings();
}