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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/mips/sgi-ip27/ip27-xtalk.c |
Initial import
Diffstat (limited to 'arch/mips/sgi-ip27/ip27-xtalk.c')
-rw-r--r-- | arch/mips/sgi-ip27/ip27-xtalk.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip27/ip27-xtalk.c b/arch/mips/sgi-ip27/ip27-xtalk.c new file mode 100644 index 000000000..20f582a21 --- /dev/null +++ b/arch/mips/sgi-ip27/ip27-xtalk.c @@ -0,0 +1,135 @@ +/* + * Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org) + * Copyright (C) 1999, 2000 Silcon Graphics, Inc. + * Copyright (C) 2004 Christoph Hellwig. + * Released under GPL v2. + * + * Generic XTALK initialization code + */ + +#include <linux/kernel.h> +#include <linux/smp.h> +#include <asm/sn/types.h> +#include <asm/sn/klconfig.h> +#include <asm/sn/hub.h> +#include <asm/pci/bridge.h> +#include <asm/xtalk/xtalk.h> + + +#define XBOW_WIDGET_PART_NUM 0x0 +#define XXBOW_WIDGET_PART_NUM 0xd000 /* Xbow in Xbridge */ +#define BASE_XBOW_PORT 8 /* Lowest external port */ + +extern int bridge_probe(nasid_t nasid, int widget, int masterwid); + +static int probe_one_port(nasid_t nasid, int widget, int masterwid) +{ + widgetreg_t widget_id; + xwidget_part_num_t partnum; + + widget_id = *(volatile widgetreg_t *) + (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID); + partnum = XWIDGET_PART_NUM(widget_id); + + printk(KERN_INFO "Cpu %d, Nasid 0x%x, widget 0x%x (partnum 0x%x) is ", + smp_processor_id(), nasid, widget, partnum); + + switch (partnum) { + case BRIDGE_WIDGET_PART_NUM: + case XBRIDGE_WIDGET_PART_NUM: + bridge_probe(nasid, widget, masterwid); + break; + default: + break; + } + + return 0; +} + +static int xbow_probe(nasid_t nasid) +{ + lboard_t *brd; + klxbow_t *xbow_p; + unsigned masterwid, i; + + printk("is xbow\n"); + + /* + * found xbow, so may have multiple bridges + * need to probe xbow + */ + brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8); + if (!brd) + return -ENODEV; + + xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW); + if (!xbow_p) + return -ENODEV; + + /* + * Okay, here's a xbow. Lets arbitrate and find + * out if we should initialize it. Set enabled + * hub connected at highest or lowest widget as + * master. + */ +#ifdef WIDGET_A + i = HUB_WIDGET_ID_MAX + 1; + do { + i--; + } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || + (!XBOW_PORT_IS_ENABLED(xbow_p, i))); +#else + i = HUB_WIDGET_ID_MIN - 1; + do { + i++; + } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || + (!XBOW_PORT_IS_ENABLED(xbow_p, i))); +#endif + + masterwid = i; + if (nasid != XBOW_PORT_NASID(xbow_p, i)) + return 1; + + for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) { + if (XBOW_PORT_IS_ENABLED(xbow_p, i) && + XBOW_PORT_TYPE_IO(xbow_p, i)) + probe_one_port(nasid, i, masterwid); + } + + return 0; +} + +void xtalk_probe_node(cnodeid_t nid) +{ + volatile u64 hubreg; + nasid_t nasid; + xwidget_part_num_t partnum; + widgetreg_t widget_id; + + nasid = COMPACT_TO_NASID_NODEID(nid); + hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR); + + /* check whether the link is up */ + if (!(hubreg & IIO_LLP_CSR_IS_UP)) + return; + + widget_id = *(volatile widgetreg_t *) + (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID); + partnum = XWIDGET_PART_NUM(widget_id); + + printk(KERN_INFO "Cpu %d, Nasid 0x%x: partnum 0x%x is ", + smp_processor_id(), nasid, partnum); + + switch (partnum) { + case BRIDGE_WIDGET_PART_NUM: + bridge_probe(nasid, 0x8, 0xa); + break; + case XBOW_WIDGET_PART_NUM: + case XXBOW_WIDGET_PART_NUM: + xbow_probe(nasid); + break; + default: + printk(" unknown widget??\n"); + break; + } +} |