diff options
Diffstat (limited to 'arch/mips/sgi-ip27/ip27-xtalk.c')
| -rw-r--r-- | arch/mips/sgi-ip27/ip27-xtalk.c | 242 |
1 files changed, 242 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..5143d1cf8 --- /dev/null +++ b/arch/mips/sgi-ip27/ip27-xtalk.c @@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org) + * Copyright (C) 1999, 2000 Silcon Graphics, Inc. + * Copyright (C) 2004 Christoph Hellwig. + * + * Generic XTALK initialization code + */ + +#include <linux/kernel.h> +#include <linux/smp.h> +#include <linux/platform_device.h> +#include <linux/platform_data/sgi-w1.h> +#include <linux/platform_data/xtalk-bridge.h> +#include <asm/sn/addrs.h> +#include <asm/sn/types.h> +#include <asm/sn/klconfig.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 */ + +static void bridge_platform_create(nasid_t nasid, int widget, int masterwid) +{ + struct xtalk_bridge_platform_data *bd; + struct sgi_w1_platform_data *wd; + struct platform_device *pdev_wd; + struct platform_device *pdev_bd; + struct resource w1_res; + unsigned long offset; + + offset = NODE_OFFSET(nasid); + + wd = kzalloc(sizeof(*wd), GFP_KERNEL); + if (!wd) { + pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget); + return; + } + + snprintf(wd->dev_id, sizeof(wd->dev_id), "bridge-%012lx", + offset + (widget << SWIN_SIZE_BITS)); + + memset(&w1_res, 0, sizeof(w1_res)); + w1_res.start = offset + (widget << SWIN_SIZE_BITS) + + offsetof(struct bridge_regs, b_nic); + w1_res.end = w1_res.start + 3; + w1_res.flags = IORESOURCE_MEM; + + pdev_wd = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO); + if (!pdev_wd) { + pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget); + goto err_kfree_wd; + } + if (platform_device_add_resources(pdev_wd, &w1_res, 1)) { + pr_warn("xtalk:n%d/%x bridge failed to add platform resources.\n", nasid, widget); + goto err_put_pdev_wd; + } + if (platform_device_add_data(pdev_wd, wd, sizeof(*wd))) { + pr_warn("xtalk:n%d/%x bridge failed to add platform data.\n", nasid, widget); + goto err_put_pdev_wd; + } + if (platform_device_add(pdev_wd)) { + pr_warn("xtalk:n%d/%x bridge failed to add platform device.\n", nasid, widget); + goto err_put_pdev_wd; + } + /* platform_device_add_data() duplicates the data */ + kfree(wd); + + bd = kzalloc(sizeof(*bd), GFP_KERNEL); + if (!bd) { + pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget); + goto err_unregister_pdev_wd; + } + pdev_bd = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO); + if (!pdev_bd) { + pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget); + goto err_kfree_bd; + } + + + bd->bridge_addr = RAW_NODE_SWIN_BASE(nasid, widget); + bd->intr_addr = BIT_ULL(47) + 0x01800000 + PI_INT_PEND_MOD; + bd->nasid = nasid; + bd->masterwid = masterwid; + + bd->mem.name = "Bridge PCI MEM"; + bd->mem.start = offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0; + bd->mem.end = offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1; + bd->mem.flags = IORESOURCE_MEM; + bd->mem_offset = offset; + + bd->io.name = "Bridge PCI IO"; + bd->io.start = offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0; + bd->io.end = offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1; + bd->io.flags = IORESOURCE_IO; + bd->io_offset = offset; + + if (platform_device_add_data(pdev_bd, bd, sizeof(*bd))) { + pr_warn("xtalk:n%d/%x bridge failed to add platform data.\n", nasid, widget); + goto err_put_pdev_bd; + } + if (platform_device_add(pdev_bd)) { + pr_warn("xtalk:n%d/%x bridge failed to add platform device.\n", nasid, widget); + goto err_put_pdev_bd; + } + /* platform_device_add_data() duplicates the data */ + kfree(bd); + pr_info("xtalk:n%d/%x bridge widget\n", nasid, widget); + return; + +err_put_pdev_bd: + platform_device_put(pdev_bd); +err_kfree_bd: + kfree(bd); +err_unregister_pdev_wd: + platform_device_unregister(pdev_wd); + return; +err_put_pdev_wd: + platform_device_put(pdev_wd); +err_kfree_wd: + kfree(wd); + return; +} + +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); + + switch (partnum) { + case BRIDGE_WIDGET_PART_NUM: + case XBRIDGE_WIDGET_PART_NUM: + bridge_platform_create(nasid, widget, masterwid); + break; + default: + pr_info("xtalk:n%d/%d unknown widget (0x%x)\n", + nasid, widget, partnum); + break; + } + + return 0; +} + +static int xbow_probe(nasid_t nasid) +{ + lboard_t *brd; + klxbow_t *xbow_p; + unsigned masterwid, i; + + /* + * 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. Let's 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; +} + +static void xtalk_probe_node(nasid_t nasid) +{ + volatile u64 hubreg; + xwidget_part_num_t partnum; + widgetreg_t widget_id; + + 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); + + switch (partnum) { + case BRIDGE_WIDGET_PART_NUM: + bridge_platform_create(nasid, 0x8, 0xa); + break; + case XBOW_WIDGET_PART_NUM: + case XXBOW_WIDGET_PART_NUM: + pr_info("xtalk:n%d/0 xbow widget\n", nasid); + xbow_probe(nasid); + break; + default: + pr_info("xtalk:n%d/0 unknown widget (0x%x)\n", nasid, partnum); + break; + } +} + +static int __init xtalk_init(void) +{ + nasid_t nasid; + + for_each_online_node(nasid) + xtalk_probe_node(nasid); + + return 0; +} +arch_initcall(xtalk_init); |