^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 1992-1997, 2000-2003 Silicon Graphics, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2004 Christoph Hellwig.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Support functions for the HUB ASIC - mostly PIO mapping related.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mmzone.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/sn/addrs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/sn/arch.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/sn/agent.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/sn/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/xtalk/xtalk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static int force_fire_and_forget = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * hub_pio_map - establish a HUB PIO mapping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * @hub: hub to perform PIO mapping on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * @widget: widget ID to perform PIO mapping for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * @xtalk_addr: xtalk_address that needs to be mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * @size: size of the PIO mapping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) unsigned long hub_pio_map(nasid_t nasid, xwidgetnum_t widget,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) unsigned long xtalk_addr, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /* use small-window mapping if possible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if ((xtalk_addr % SWIN_SIZE) + size <= SWIN_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return NODE_SWIN_BASE(nasid, widget) + (xtalk_addr % SWIN_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if ((xtalk_addr % BWIN_SIZE) + size > BWIN_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) printk(KERN_WARNING "PIO mapping at hub %d widget %d addr 0x%lx"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) " too big (%ld)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) nasid, widget, xtalk_addr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) xtalk_addr &= ~(BWIN_SIZE-1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) for (i = 0; i < HUB_NUM_BIG_WINDOW; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (test_and_set_bit(i, hub_data(nasid)->h_bigwin_used))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * The code below does a PIO write to setup an ITTE entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * We need to prevent other CPUs from seeing our updated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * memory shadow of the ITTE (in the piomap) until the ITTE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * entry is actually set up; otherwise, another CPU might
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * attempt a PIO prematurely.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * Also, the only way we can know that an entry has been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * received by the hub and can be used by future PIO reads/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * writes is by reading back the ITTE entry after writing it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * For these two reasons, we PIO read back the ITTE entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * after we write it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) IIO_ITTE_PUT(nasid, i, HUB_PIO_MAP_TO_MEM, widget, xtalk_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) __raw_readq(IIO_ITTE_GET(nasid, i));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return NODE_BWIN_BASE(nasid, widget) + (xtalk_addr % BWIN_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) printk(KERN_WARNING "unable to establish PIO mapping for at"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) " hub %d widget %d addr 0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) nasid, widget, xtalk_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * hub_setup_prb(nasid, prbnum, credits, conveyor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * Put a PRB into fire-and-forget mode if conveyor isn't set. Otherwise,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * put it into conveyor belt mode with the specified number of credits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static void hub_setup_prb(nasid_t nasid, int prbnum, int credits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) union iprb_u prb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) int prb_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * Get the current register value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) prb_offset = IIO_IOPRB(prbnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) prb.iprb_regval = REMOTE_HUB_L(nasid, prb_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * Clear out some fields.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) prb.iprb_ovflow = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) prb.iprb_bnakctr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) prb.iprb_anakctr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * Enable or disable fire-and-forget mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) prb.iprb_ff = force_fire_and_forget ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * Set the appropriate number of PIO credits for the widget.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) prb.iprb_xtalkctr = credits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * Store the new value to the register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) REMOTE_HUB_S(nasid, prb_offset, prb.iprb_regval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * hub_set_piomode - set pio mode for a given hub
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * @nasid: physical node ID for the hub in question
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * Put the hub into either "PIO conveyor belt" mode or "fire-and-forget" mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) * To do this, we have to make absolutely sure that no PIOs are in progress
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * so we turn off access to all widgets for the duration of the function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * XXX - This code should really check what kind of widget we're talking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * to. Bridges can only handle three requests, but XG will do more.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * How many can crossbow handle to widget 0? We're assuming 1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * XXX - There is a bug in the crossbow that link reset PIOs do not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * return write responses. The easiest solution to this problem is to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * leave widget 0 (xbow) in fire-and-forget mode at all times. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * only affects pio's to xbow registers, which should be rare.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static void hub_set_piomode(nasid_t nasid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) u64 ii_iowa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) union hubii_wcr_u ii_wcr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) ii_iowa = REMOTE_HUB_L(nasid, IIO_OUTWIDGET_ACCESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) REMOTE_HUB_S(nasid, IIO_OUTWIDGET_ACCESS, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) ii_wcr.wcr_reg_value = REMOTE_HUB_L(nasid, IIO_WCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (ii_wcr.iwcr_dir_con) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * Assume a bridge here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) hub_setup_prb(nasid, 0, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * Assume a crossbow here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) hub_setup_prb(nasid, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * XXX - Here's where we should take the widget type into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * when account assigning credits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) hub_setup_prb(nasid, i, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) REMOTE_HUB_S(nasid, IIO_OUTWIDGET_ACCESS, ii_iowa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * hub_pio_init - PIO-related hub initialization
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * @hub: hubinfo structure for our hub
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) void hub_pio_init(nasid_t nasid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /* initialize big window piomaps for this hub */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) bitmap_zero(hub_data(nasid)->h_bigwin_used, HUB_NUM_BIG_WINDOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) for (i = 0; i < HUB_NUM_BIG_WINDOW; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) IIO_ITTE_DISABLE(nasid, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) hub_set_piomode(nasid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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