lba_pci.c
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上传日期:2013-02-24
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文件大小:38k
- /*
- ** PCI Lower Bus Adapter (LBA) manager
- **
- ** (c) Copyright 1999,2000 Grant Grundler
- ** (c) Copyright 1999,2000 Hewlett-Packard Company
- **
- ** This program is free software; you can redistribute it and/or modify
- ** it under the terms of the GNU General Public License as published by
- ** the Free Software Foundation; either version 2 of the License, or
- ** (at your option) any later version.
- **
- **
- ** This module primarily provides access to PCI bus (config/IOport
- ** spaces) on platforms with an SBA/LBA chipset. A/B/C/J/L/N-class
- ** with 4 digit model numbers - eg C3000 (and A400...sigh).
- **
- ** LBA driver isn't as simple as the Dino driver because:
- ** (a) this chip has substantial bug fixes between revisions
- ** (Only one Dino bug has a software workaround :^( )
- ** (b) has more options which we don't (yet) support (DMA hints, OLARD)
- ** (c) IRQ support lives in the I/O SAPIC driver (not with PCI driver)
- ** (d) play nicely with both PAT and "Legacy" PA-RISC firmware (PDC).
- ** (dino only deals with "Legacy" PDC)
- **
- ** LBA driver passes the I/O SAPIC HPA to the I/O SAPIC driver.
- ** (I/O SAPIC is integratd in the LBA chip).
- **
- ** FIXME: Add support to SBA and LBA drivers for DMA hint sets
- ** FIXME: Add support for PCI card hot-plug (OLARD).
- */
- #include <linux/delay.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/spinlock.h>
- #include <linux/init.h> /* for __init and __devinit */
- #include <linux/pci.h>
- #include <linux/ioport.h>
- #include <linux/slab.h>
- #include <linux/smp_lock.h>
- #include <asm/byteorder.h>
- #include <asm/irq.h> /* for struct irq_region support */
- #include <asm/pdc.h>
- #include <asm/pdcpat.h>
- #include <asm/page.h>
- #include <asm/segment.h>
- #include <asm/system.h>
- #include <asm/hardware.h> /* for register_driver() stuff */
- #include <asm/iosapic.h> /* for iosapic_register() */
- #include <asm/gsc.h> /* gsc_read/write stuff */
- #ifndef TRUE
- #define TRUE (1 == 1)
- #define FALSE (1 == 0)
- #endif
- #undef DEBUG_LBA /* general stuff */
- #undef DEBUG_LBA_PORT /* debug I/O Port access */
- #undef DEBUG_LBA_CFG /* debug Config Space Access (ie PCI Bus walk) */
- #undef DEBUG_LBA_PAT /* debug PCI Resource Mgt code - PDC PAT only */
- #ifdef DEBUG_LBA
- #define DBG(x...) printk(x)
- #else
- #define DBG(x...)
- #endif
- #ifdef DEBUG_LBA_PORT
- #define DBG_PORT(x...) printk(x)
- #else
- #define DBG_PORT(x...)
- #endif
- #ifdef DEBUG_LBA_CFG
- #define DBG_CFG(x...) printk(x)
- #else
- #define DBG_CFG(x...)
- #endif
- #ifdef DEBUG_LBA_PAT
- #define DBG_PAT(x...) printk(x)
- #else
- #define DBG_PAT(x...)
- #endif
- /*
- ** Config accessor functions only pass in the 8-bit bus number and not
- ** the 8-bit "PCI Segment" number. Each LBA will be assigned a PCI bus
- ** number based on what firmware wrote into the scratch register.
- **
- ** The "secondary" bus number is set to this before calling
- ** pci_register_ops(). If any PPB's are present, the scan will
- ** discover them and update the "secondary" and "subordinate"
- ** fields in the pci_bus structure.
- **
- ** Changes in the configuration *may* result in a different
- ** bus number for each LBA depending on what firmware does.
- */
- #define MODULE_NAME "lba"
- static int lba_driver_callback(struct hp_device *, struct pa_iodc_driver *);
- static struct pa_iodc_driver lba_drivers_for[]= {
- {HPHW_BRIDGE, 0x782, 0x0, 0xa, 0,0,
- DRIVER_CHECK_HVERSION +
- DRIVER_CHECK_SVERSION + DRIVER_CHECK_HWTYPE,
- MODULE_NAME, "tbd", (void *) lba_driver_callback},
- {0,0,0,0,0,0,
- 0,
- (char *) NULL, (char *) NULL, (void *) NULL}
- };
- #define LBA_FUNC_ID 0x0000 /* function id */
- #define LBA_FCLASS 0x0008 /* function class, bist, header, rev... */
- #define LBA_CAPABLE 0x0030 /* capabilities register */
- #define LBA_PCI_CFG_ADDR 0x0040 /* poke CFG address here */
- #define LBA_PCI_CFG_DATA 0x0048 /* read or write data here */
- #define LBA_PMC_MTLT 0x0050 /* Firmware sets this - read only. */
- #define LBA_FW_SCRATCH 0x0058 /* Firmware writes the PCI bus number here. */
- #define LBA_ERROR_ADDR 0x0070 /* On error, address gets logged here */
- #define LBA_ARB_MASK 0x0080 /* bit 0 enable arbitration. PAT/PDC enables */
- #define LBA_ARB_PRI 0x0088 /* firmware sets this. */
- #define LBA_ARB_MODE 0x0090 /* firmware sets this. */
- #define LBA_ARB_MTLT 0x0098 /* firmware sets this. */
- #define LBA_MOD_ID 0x0100 /* Module ID. PDC_PAT_CELL reports 4 */
- #define LBA_STAT_CTL 0x0108 /* Status & Control */
- #define HF_ENABLE 0x40 /* enable HF mode (default is -1 mode) */
- #define LBA_LMMIO_BASE 0x0200 /* < 4GB I/O address range */
- #define LBA_LMMIO_MASK 0x0208
- #define LBA_GMMIO_BASE 0x0210 /* > 4GB I/O address range */
- #define LBA_GMMIO_MASK 0x0218
- #define LBA_WLMMIO_BASE 0x0220 /* All < 4GB ranges under the same *SBA* */
- #define LBA_WLMMIO_MASK 0x0228
- #define LBA_WGMMIO_BASE 0x0230 /* All > 4GB ranges under the same *SBA* */
- #define LBA_WGMMIO_MASK 0x0238
- #define LBA_IOS_BASE 0x0240 /* I/O port space for this LBA */
- #define LBA_IOS_MASK 0x0248
- #define LBA_ELMMIO_BASE 0x0250 /* Extra LMMIO range */
- #define LBA_ELMMIO_MASK 0x0258
- #define LBA_EIOS_BASE 0x0260 /* Extra I/O port space */
- #define LBA_EIOS_MASK 0x0268
- #define LBA_DMA_CTL 0x0278 /* firmware sets this */
- /* RESET: ignore DMA stuff until we can measure performance */
- #define LBA_IBASE 0x0300 /* DMA support */
- #define LBA_IMASK 0x0308
- #define LBA_HINT_CFG 0x0310
- #define LBA_HINT_BASE 0x0380 /* 14 registers at every 8 bytes. */
- /* ERROR regs are needed for config cycle kluges */
- #define LBA_ERROR_CONFIG 0x0680
- #define LBA_ERROR_STATUS 0x0688
- #define LBA_IOSAPIC_BASE 0x800 /* Offset of IRQ logic */
- /* non-postable I/O port space, densely packed */
- #ifdef __LP64__
- #define LBA_ASTRO_PORT_BASE (0xfffffffffee00000UL)
- #else
- #define LBA_ASTRO_PORT_BASE (0xfee00000UL)
- #endif
- /*
- ** lba_device: Per instance Elroy data structure
- */
- struct lba_device {
- struct pci_hba_data hba;
- spinlock_t lba_lock;
- void *iosapic_obj;
- #ifdef __LP64__
- unsigned long lmmio_base; /* PA_VIEW - fixup MEM addresses */
- unsigned long gmmio_base; /* PA_VIEW - Not used (yet) */
- unsigned long iop_base; /* PA_VIEW - for IO port accessor funcs */
- #endif
- int flags; /* state/functionality enabled */
- int hw_rev; /* HW revision of chip */
- };
- static u32 lba_t32;
- /*
- ** lba "flags"
- */
- #define LBA_FLAG_NO_DMA_DURING_CFG 0x01
- #define LBA_FLAG_SKIP_PROBE 0x10
- /* Tape Release 4 == hw_rev 5 */
- #define LBA_TR4PLUS(d) ((d)->hw_rev > 0x4)
- #define LBA_DMA_DURING_CFG_DISABLED(d) ((d)->flags & LBA_FLAG_NO_DMA_DURING_CFG)
- #define LBA_SKIP_PROBE(d) ((d)->flags & LBA_FLAG_SKIP_PROBE)
- /* Looks nice and keeps the compiler happy */
- #define LBA_DEV(d) ((struct lba_device *) (d))
- /*
- ** Only allow 8 subsidiary busses per LBA
- ** Problem is the PCI bus numbering is globally shared.
- */
- #define LBA_MAX_NUM_BUSES 8
- /************************************
- * LBA register read and write support
- *
- * BE WARNED: register writes are posted.
- * (ie follow writes which must reach HW with a read)
- */
- #define READ_U8(addr) gsc_readb(addr)
- #define READ_U16(addr) gsc_readw((u16 *) (addr))
- #define READ_U32(addr) gsc_readl((u32 *) (addr))
- #define WRITE_U8(value, addr) gsc_writeb(value, addr)
- #define WRITE_U16(value, addr) gsc_writew(value, (u16 *) (addr))
- #define WRITE_U32(value, addr) gsc_writel(value, (u32 *) (addr))
- #define READ_REG8(addr) gsc_readb(addr)
- #define READ_REG16(addr) le16_to_cpu(gsc_readw((u16 *) (addr)))
- #define READ_REG32(addr) le32_to_cpu(gsc_readl((u32 *) (addr)))
- #define WRITE_REG8(value, addr) gsc_writeb(value, addr)
- #define WRITE_REG16(value, addr) gsc_writew(cpu_to_le16(value), (u16 *) (addr))
- #define WRITE_REG32(value, addr) gsc_writel(cpu_to_le32(value), (u32 *) (addr))
- #define LBA_CFG_TOK(bus,dfn) ((u32) ((bus)<<16 | (dfn)<<8))
- #define LBA_CFG_BUS(tok) ((u8) ((tok)>>16))
- #define LBA_CFG_DEV(tok) ((u8) ((tok)>>11) & 0x1f)
- #define LBA_CFG_FUNC(tok) ((u8) ((tok)>>8 ) & 0x7)
- #ifdef DEBUG_LBA
- /* Extract LBA (Rope) number from HPA */
- #define LBA_NUM(x) ((((uintptr_t) x) >> 13) & 0xf)
- #endif /* DEBUG_LBA */
- #ifdef __LP64__
- /* PDC_PAT */
- static unsigned long pdc_result[32] __attribute__ ((aligned (8))) = {0,0,0,0};
- #endif
- /*
- ** One time initialization to let the world know the LBA was found.
- ** This is the only routine which is NOT static.
- ** Must be called exactly once before pci_init().
- */
- void __init lba_init(void)
- {
- register_driver(lba_drivers_for);
- }
- static void
- lba_dump_res(struct resource *r, int d)
- {
- int i;
- if (NULL == r)
- return;
- printk("(%p)", r->parent);
- for (i = d; i ; --i) printk(" ");
- printk("%p [%lx,%lx]/%xn", r, r->start, r->end, (int) r->flags);
- lba_dump_res(r->child, d+2);
- lba_dump_res(r->sibling, d);
- }
- /*
- ** LBA rev 2.0, 2.1, 2.2, and 3.0 bus walks require a complex
- ** workaround for cfg cycles:
- ** -- preserve LBA state
- ** -- LBA_FLAG_NO_DMA_DURING_CFG workaround
- ** -- turn on smart mode
- ** -- probe with config writes before doing config reads
- ** -- check ERROR_STATUS
- ** -- clear ERROR_STATUS
- ** -- restore LBA state
- **
- ** The workaround is only used for device discovery.
- */
- static int
- lba_device_present( u8 bus, u8 dfn, struct lba_device *d)
- {
- u8 first_bus = d->hba.hba_bus->secondary;
- u8 last_sub_bus = d->hba.hba_bus->subordinate;
- #if 0
- /* FIXME - see below in this function */
- u8 dev = PCI_SLOT(dfn);
- u8 func = PCI_FUNC(dfn);
- #endif
- ASSERT(bus >= first_bus);
- ASSERT(bus <= last_sub_bus);
- ASSERT((bus - first_bus) < LBA_MAX_NUM_BUSES);
- if ((bus < first_bus) ||
- (bus > last_sub_bus) ||
- ((bus - first_bus) >= LBA_MAX_NUM_BUSES))
- {
- /* devices that fall into any of these cases won't get claimed */
- return(FALSE);
- }
- #if 0
- /*
- ** FIXME: Need to implement code to fill the devices bitmap based
- ** on contents of the local pci_bus tree "data base".
- ** pci_register_ops() walks the bus for us and builds the tree.
- ** For now, always do the config cycle.
- */
- bus -= first_bus;
- return (((d->devices[bus][dev]) >> func) & 0x1);
- #else
- return TRUE;
- #endif
- }
- #define LBA_CFG_SETUP(d, tok) {
- /* Save contents of error config register. */
- error_config = READ_REG32(d->hba.base_addr + LBA_ERROR_CONFIG);
- /* Save contents of status control register. */
- status_control = READ_REG32(d->hba.base_addr + LBA_STAT_CTL);
- /* For LBA rev 2.0, 2.1, 2.2, and 3.0, we must disable DMA
- ** arbitration for full bus walks.
- */
- if (LBA_DMA_DURING_CFG_DISABLED(d)) {
- /* Save contents of arb mask register. */
- arb_mask = READ_REG32(d->hba.base_addr + LBA_ARB_MASK);
- /*
- * Turn off all device arbitration bits (i.e. everything
- * except arbitration enable bit).
- */
- WRITE_REG32(0x1, d->hba.base_addr + LBA_ARB_MASK);
- }
- /*
- * Set the smart mode bit so that master aborts don't cause
- * LBA to go into PCI fatal mode (required).
- */
- WRITE_REG32(error_config | 0x20, d->hba.base_addr + LBA_ERROR_CONFIG);
- }
- #define LBA_CFG_PROBE(d, tok) {
- /*
- * Setup Vendor ID write and read back the address register
- * to make sure that LBA is the bus master.
- */
- WRITE_REG32(tok | PCI_VENDOR_ID, (d)->hba.base_addr + LBA_PCI_CFG_ADDR);
- /*
- * Read address register to ensure that LBA is the bus master,
- * which implies that DMA traffic has stopped when DMA arb is off.
- */
- lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);
- /*
- * Generate a cfg write cycle (will have no affect on
- * Vendor ID register since read-only).
- */
- WRITE_REG32(~0, (d)->hba.base_addr + LBA_PCI_CFG_DATA);
- /*
- * Make sure write has completed before proceeding further,
- * i.e. before setting clear enable.
- */
- lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);
- }
- /*
- * HPREVISIT:
- * -- Can't tell if config cycle got the error.
- *
- * OV bit is broken until rev 4.0, so can't use OV bit and
- * LBA_ERROR_LOG_ADDR to tell if error belongs to config cycle.
- *
- * As of rev 4.0, no longer need the error check.
- *
- * -- Even if we could tell, we still want to return -1
- * for **ANY** error (not just master abort).
- *
- * -- Only clear non-fatal errors (we don't want to bring
- * LBA out of pci-fatal mode).
- *
- * Actually, there is still a race in which
- * we could be clearing a fatal error. We will
- * live with this during our real mode bus walk
- * until rev 4.0 (no driver activity during
- * real mode bus walk). The real mode bus walk
- * has race conditions concerning the use of
- * smart mode as well.
- */
- #define LBA_MASTER_ABORT_ERROR 0xc
- #define LBA_FATAL_ERROR 0x10
- #define LBA_CFG_MASTER_ABORT_CHECK(d, base, tok, error) {
- u32 error_status = 0;
- /*
- * Set clear enable (CE) bit. Unset by HW when new
- * errors are logged -- LBA HW ERS section 14.3.3).
- */
- WRITE_REG32(status_control | 0x20, base + LBA_STAT_CTL);
- error_status = READ_REG32(base + LBA_ERROR_STATUS);
- if ((error_status & 0x1f) != 0) {
- /*
- * Fail the config read request.
- */
- error = 1;
- if ((error_status & LBA_FATAL_ERROR) == 0) {
- /*
- * Clear error status (if fatal bit not set) by setting
- * clear error log bit (CL).
- */
- WRITE_REG32(status_control | 0x10, base + LBA_STAT_CTL);
- }
- }
- }
- #define LBA_CFG_TR4_ADDR_SETUP(d, addr)
- WRITE_REG32(((addr) & ~3), (d)->hba.base_addr + LBA_PCI_CFG_ADDR)
- #define LBA_CFG_ADDR_SETUP(d, addr) {
- WRITE_REG32(((addr) & ~3), (d)->hba.base_addr + LBA_PCI_CFG_ADDR);
- /*
- * HPREVISIT:
- * -- Potentially could skip this once DMA bug fixed.
- *
- * Read address register to ensure that LBA is the bus master,
- * which implies that DMA traffic has stopped when DMA arb is off.
- */
- lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);
- }
- #define LBA_CFG_RESTORE(d, base) {
- /*
- * Restore status control register (turn off clear enable).
- */
- WRITE_REG32(status_control, base + LBA_STAT_CTL);
- /*
- * Restore error config register (turn off smart mode).
- */
- WRITE_REG32(error_config, base + LBA_ERROR_CONFIG);
- if (LBA_DMA_DURING_CFG_DISABLED(d)) {
- /*
- * Restore arb mask register (reenables DMA arbitration).
- */
- WRITE_REG32(arb_mask, base + LBA_ARB_MASK);
- }
- }
- static unsigned int
- lba_rd_cfg( struct lba_device *d, u32 tok, u8 reg, u32 size)
- {
- u32 data = ~0;
- int error = 0;
- u32 arb_mask = 0; /* used by LBA_CFG_SETUP/RESTORE */
- u32 error_config = 0; /* used by LBA_CFG_SETUP/RESTORE */
- u32 status_control = 0; /* used by LBA_CFG_SETUP/RESTORE */
- ASSERT((size == sizeof(u8)) ||
- (size == sizeof(u16)) ||
- (size == sizeof(u32)));
- if ((size != sizeof(u8)) &&
- (size != sizeof(u16)) &&
- (size != sizeof(u32))) {
- return(data);
- }
- LBA_CFG_SETUP(d, tok);
- LBA_CFG_PROBE(d, tok);
- LBA_CFG_MASTER_ABORT_CHECK(d, d->hba.base_addr, tok, error);
- if (!error) {
- LBA_CFG_ADDR_SETUP(d, tok | reg);
- switch (size) {
- case sizeof(u8):
- data = (u32) READ_REG8(d->hba.base_addr + LBA_PCI_CFG_DATA + (reg & 3));
- break;
- case sizeof(u16):
- data = (u32) READ_REG16(d->hba.base_addr + LBA_PCI_CFG_DATA + (reg & 2));
- break;
- case sizeof(u32):
- data = READ_REG32(d->hba.base_addr + LBA_PCI_CFG_DATA);
- break;
- default:
- break; /* leave data as -1 */
- }
- }
- LBA_CFG_RESTORE(d, d->hba.base_addr);
- return(data);
- }
- #define LBA_CFG_RD(size, mask)
- static int lba_cfg_read##size (struct pci_dev *dev, int pos, u##size *data)
- {
- struct lba_device *d = LBA_DEV(dev->bus->sysdata);
- u32 local_bus = (dev->bus->parent == NULL) ? 0 : dev->bus->secondary;
- u32 tok = LBA_CFG_TOK(local_bus,dev->devfn);
-
- if ((!LBA_TR4PLUS(d)) && (!LBA_SKIP_PROBE(d))) {
- /* original - Generate config cycle on broken elroy
- with risk we will miss PCI bus errors. */
- *data = (u##size) lba_rd_cfg(d, tok, pos, sizeof(u##size));
- DBG_CFG(KERN_DEBUG "%s(%s+%2x) -> 0x%x (a)n", __FUNCTION__, dev->slot_name, pos, *data);
- return(*data == (u##size) -1);
- }
-
- if (LBA_SKIP_PROBE(d) && (!lba_device_present(dev->bus->secondary, dev->devfn, d)))
- {
- DBG_CFG(KERN_DEBUG "%s(%s+%2x) -> -1 (b)n", __FUNCTION__, dev->slot_name, pos, *data);
- /* either don't want to look or know device isn't present. */
- *data = (u##size) -1;
- return(0);
- }
-
- /* Basic Algorithm
- ** Should only get here on fully working LBA rev.
- ** This is how simple the code should have been.
- */
- LBA_CFG_TR4_ADDR_SETUP(d, tok | pos);
- *data = READ_REG##size(d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & mask));
- DBG_CFG(KERN_DEBUG "%s(%s+%2x) -> 0x%x (c)n", __FUNCTION__, dev->slot_name, pos, *data);
- return(*data == (u##size) -1);
- }
- LBA_CFG_RD( 8, 3)
- LBA_CFG_RD(16, 2)
- LBA_CFG_RD(32, 0)
- static void
- lba_wr_cfg( struct lba_device *d, u32 tok, u8 reg, u32 data, u32 size)
- {
- int error = 0;
- u32 arb_mask = 0;
- u32 error_config = 0;
- u32 status_control = 0;
- ASSERT((size == sizeof(u8)) ||
- (size == sizeof(u16)) ||
- (size == sizeof(u32)));
- if ((size != sizeof(u8)) &&
- (size != sizeof(u16)) &&
- (size != sizeof(u32))) {
- return;
- }
- LBA_CFG_SETUP(d, tok);
- LBA_CFG_ADDR_SETUP(d, tok | reg);
- switch (size) {
- case sizeof(u8):
- WRITE_REG8((u8) data, d->hba.base_addr + LBA_PCI_CFG_DATA + (reg&3));
- break;
- case sizeof(u16):
- WRITE_REG16((u8) data, d->hba.base_addr + LBA_PCI_CFG_DATA +(reg&2));
- break;
- case sizeof(u32):
- WRITE_REG32(data, d->hba.base_addr + LBA_PCI_CFG_DATA);
- break;
- default:
- break;
- }
- LBA_CFG_MASTER_ABORT_CHECK(d, d->hba.base_addr, tok, error);
- LBA_CFG_RESTORE(d, d->hba.base_addr);
- }
- /*
- * LBA 4.0 config write code implements non-postable semantics
- * by doing a read of CONFIG ADDR after the write.
- */
- #define LBA_CFG_WR(size, mask)
- static int lba_cfg_write##size (struct pci_dev *dev, int pos, u##size data)
- {
- struct lba_device *d = LBA_DEV(dev->bus->sysdata);
- u32 local_bus = (dev->bus->parent == NULL) ? 0 : dev->bus->secondary;
- u32 tok = LBA_CFG_TOK(local_bus,dev->devfn);
-
- ASSERT((tok & 0xff) == 0);
- ASSERT(pos < 0x100);
-
- if ((!LBA_TR4PLUS(d)) && (!LBA_SKIP_PROBE(d))) {
- /* Original Workaround */
- lba_wr_cfg(d, tok, pos, (u32) data, sizeof(u##size));
- DBG_CFG(KERN_DEBUG "%s(%s+%2x) = 0x%x (a)n", __FUNCTION__, dev->slot_name, pos, data);
- return 0;
- }
-
- if (LBA_SKIP_PROBE(d) && (!lba_device_present(dev->bus->secondary, dev->devfn, d))) {
- DBG_CFG(KERN_DEBUG "%s(%s+%2x) = 0x%x (b)n", __FUNCTION__, dev->slot_name, pos, data);
- return 1; /* New Workaround */
- }
-
- DBG_CFG(KERN_DEBUG "%s(%s+%2x) = 0x%x (c)n", __FUNCTION__, dev->slot_name, pos, data);
- /* Basic Algorithm */
- LBA_CFG_TR4_ADDR_SETUP(d, tok | pos);
- WRITE_REG##size(data, d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & mask));
- lba_t32 = READ_REG32(d->hba.base_addr + LBA_PCI_CFG_ADDR);
- return 0;
- }
- LBA_CFG_WR( 8, 3)
- LBA_CFG_WR(16, 2)
- LBA_CFG_WR(32, 0)
- static struct pci_ops lba_cfg_ops = {
- lba_cfg_read8, lba_cfg_read16, lba_cfg_read32,
- lba_cfg_write8, lba_cfg_write16, lba_cfg_write32
- };
- static void
- lba_bios_init(void)
- {
- DBG(KERN_DEBUG MODULE_NAME ": lba_bios_initn");
- }
- #ifdef __LP64__
- /*
- ** Determine if a device is already configured.
- ** If so, reserve it resources.
- **
- ** Read PCI cfg command register and see if I/O or MMIO is enabled.
- ** PAT has to enable the devices it's using.
- **
- ** Note: resources are fixed up before we try to claim them.
- */
- static void
- lba_claim_dev_resources(struct pci_dev *dev)
- {
- u16 cmd;
- int i, srch_flags;
- (void) lba_cfg_read16(dev, PCI_COMMAND, &cmd);
- srch_flags = (cmd & PCI_COMMAND_IO) ? IORESOURCE_IO : 0;
- if (cmd & PCI_COMMAND_MEMORY)
- srch_flags |= IORESOURCE_MEM;
- if (!srch_flags)
- return;
- for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
- if (dev->resource[i].flags & srch_flags) {
- pci_claim_resource(dev, i);
- DBG(" claimed %s %d [%lx,%lx]/%xn",
- dev->slot_name, i,
- dev->resource[i].start,
- dev->resource[i].end,
- (int) dev->resource[i].flags
- );
- }
- }
- }
- #endif
- /*
- ** The algorithm is generic code.
- ** But it needs to access local data structures to get the IRQ base.
- ** Could make this a "pci_fixup_irq(bus, region)" but not sure
- ** it's worth it.
- **
- ** Called by do_pci_scan_bus() immediately after each PCI bus is walked.
- ** Resources aren't allocated until recursive buswalk below HBA is completed.
- */
- static void
- lba_fixup_bus(struct pci_bus *bus)
- {
- struct list_head *ln;
- struct pci_dev *dev;
- u16 fbb_enable = PCI_STATUS_FAST_BACK;
- u16 status;
- struct lba_device *ldev = LBA_DEV(bus->sysdata);
- #ifdef __LP64__
- int i;
- #endif
- DBG("lba_fixup_bus(0x%p) bus %d sysdata 0x%pn",
- bus, bus->secondary, bus->sysdata);
- /*
- ** Properly Setup MMIO resources for this bus.
- ** pci_alloc_primary_bus() mangles this.
- */
- if (NULL == bus->self) {
- int err;
- DBG("lba_fixup_bus() %s [%lx/%lx]/%xn",
- ldev->hba.io_space.name,
- ldev->hba.io_space.start,
- ldev->hba.io_space.end,
- (int) ldev->hba.io_space.flags);
- DBG("lba_fixup_bus() %s [%lx/%lx]/%xn",
- ldev->hba.mem_space.name,
- ldev->hba.mem_space.start,
- ldev->hba.mem_space.end,
- (int) ldev->hba.mem_space.flags);
- err = request_resource(&ioport_resource, &(ldev->hba.io_space));
- if (err < 0) {
- BUG();
- lba_dump_res(&ioport_resource, 2);
- }
- err = request_resource(&iomem_resource, &(ldev->hba.mem_space));
- if (err < 0) {
- BUG();
- lba_dump_res(&iomem_resource, 2);
- }
- bus->resource[0] = &(ldev->hba.io_space);
- bus->resource[1] = &(ldev->hba.mem_space);
- }
- list_for_each(ln, &bus->devices) {
- dev = pci_dev_b(ln);
- #ifdef __LP64__
- /*
- ** 0-5 are the "standard PCI regions"
- ** (see comments near PCI_NUM_RESOURCES in include/linux/pci.h)
- */
- for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
- struct resource *res = &(dev->resource[i]);
- if (res->flags & IORESOURCE_MEM) {
- /* "Globalize" PCI address */
- res->start |= ldev->lmmio_base;
- res->end |= ldev->lmmio_base;
- }
- }
- #endif
- /*
- ** If one device does not support FBB transfers,
- ** No one on the bus can be allowed to use them.
- */
- (void) lba_cfg_read16(dev, PCI_STATUS, &status);
- fbb_enable &= status;
- #ifdef __LP64__
- if (pdc_pat) {
- /* Claim resources for PDC's devices */
- lba_claim_dev_resources(dev);
- }
- #endif /* __LP64__ */
- /*
- ** P2PB's have no IRQs. ignore them.
- */
- if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)
- continue;
- /* Adjust INTERRUPT_LINE for this dev */
- iosapic_fixup_irq(LBA_DEV(bus->sysdata)->iosapic_obj, dev);
- }
- #if 0
- /* FIXME/REVISIT - finish figuring out to set FBB on both
- ** pbus_set_ranges() clobbers PCI_BRIDGE_CONTROL.
- ** Can't fixup here anyway....garr...
- */
- if (fbb_enable) {
- if (bus->self) {
- u8 control;
- /* enable on PPB */
- (void) lba_cfg_read8(bus->self, PCI_BRIDGE_CONTROL, &control);
- (void) lba_cfg_write8(bus->self, PCI_BRIDGE_CONTROL, control | PCI_STATUS_FAST_BACK);
- } else {
- /* enable on LBA */
- }
- fbb_enable = PCI_COMMAND_FAST_BACK;
- }
- /* Lastly enable FBB/PERR/SERR on all devices too */
- list_for_each(ln, &bus->devices) {
- (void) lba_cfg_read16(dev, PCI_COMMAND, &status);
- status |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR | fbb_enable;
- (void) lba_cfg_write16(dev, PCI_COMMAND, status);
- }
- #endif
- }
- struct pci_bios_ops lba_bios_ops = {
- lba_bios_init,
- lba_fixup_bus /* void lba_fixup_bus(struct pci_bus *bus) */
- };
- /*******************************************************
- **
- ** LBA Sprockets "I/O Port" Space Accessor Functions
- **
- ** This set of accessor functions is intended for use with
- ** "legacy firmware" (ie Sprockets on Allegro/Forte boxes).
- **
- ** Many PCI devices don't require use of I/O port space (eg Tulip,
- ** NCR720) since they export the same registers to both MMIO and
- ** I/O port space. In general I/O port space is slower than
- ** MMIO since drivers are designed so PIO writes can be posted.
- **
- ********************************************************/
- #define LBA_PORT_IN(size, mask)
- static u##size lba_astro_in##size (struct pci_hba_data *d, u16 addr)
- {
- u##size t;
- ASSERT(bus != NULL);
- DBG_PORT(KERN_DEBUG "%s(0x%p, 0x%x) ->", __FUNCTION__, bus, addr);
- t = READ_REG##size(LBA_ASTRO_PORT_BASE + addr);
- DBG_PORT(" 0x%xn", t);
- return (t);
- }
- LBA_PORT_IN( 8, 3)
- LBA_PORT_IN(16, 2)
- LBA_PORT_IN(32, 0)
- /*
- ** BUG X4107: Ordering broken - DMA RD return can bypass PIO WR
- **
- ** Fixed in Elroy 2.2. The READ_U32(..., LBA_FUNC_ID) below is
- ** guarantee non-postable completion semantics - not avoid X4107.
- ** The READ_U32 only guarantees the write data gets to elroy but
- ** out to the PCI bus. We can't read stuff from I/O port space
- ** since we don't know what has side-effects. Attempting to read
- ** from configuration space would be suicidal given the number of
- ** bugs in that elroy functionality.
- **
- ** Description:
- ** DMA read results can improperly pass PIO writes (X4107). The
- ** result of this bug is that if a processor modifies a location in
- ** memory after having issued PIO writes, the PIO writes are not
- ** guaranteed to be completed before a PCI device is allowed to see
- ** the modified data in a DMA read.
- **
- ** Note that IKE bug X3719 in TR1 IKEs will result in the same
- ** symptom.
- **
- ** Workaround:
- ** The workaround for this bug is to always follow a PIO write with
- ** a PIO read to the same bus before starting DMA on that PCI bus.
- **
- */
- #define LBA_PORT_OUT(size, mask)
- static void lba_astro_out##size (struct pci_hba_data *d, u16 addr, u##size val)
- {
- ASSERT(bus != NULL);
- DBG_PORT(KERN_DEBUG "%s(0x%p, 0x%x, 0x%x)n", __FUNCTION__, d, addr, val);
- WRITE_REG##size(val, LBA_ASTRO_PORT_BASE + addr);
- if (LBA_DEV(d)->hw_rev < 3)
- lba_t32 = READ_U32(d->base_addr + LBA_FUNC_ID);
- }
- LBA_PORT_OUT( 8, 3)
- LBA_PORT_OUT(16, 2)
- LBA_PORT_OUT(32, 0)
- static struct pci_port_ops lba_astro_port_ops = {
- lba_astro_in8, lba_astro_in16, lba_astro_in32,
- lba_astro_out8, lba_astro_out16, lba_astro_out32
- };
- #ifdef __LP64__
- #define PIOP_TO_GMMIO(lba, addr)
- ((lba)->iop_base + (((addr)&0xFFFC)<<10) + ((addr)&3))
- /*******************************************************
- **
- ** LBA PAT "I/O Port" Space Accessor Functions
- **
- ** This set of accessor functions is intended for use with
- ** "PAT PDC" firmware (ie Prelude/Rhapsody/Piranha boxes).
- **
- ** This uses the PIOP space located in the first 64MB of GMMIO.
- ** Each rope gets a full 64*KB* (ie 4 bytes per page) this way.
- ** bits 1:0 stay the same. bits 15:2 become 25:12.
- ** Then add the base and we can generate an I/O Port cycle.
- ********************************************************/
- #undef LBA_PORT_IN
- #define LBA_PORT_IN(size, mask)
- static u##size lba_pat_in##size (struct pci_hba_data *l, u16 addr)
- {
- u##size t;
- ASSERT(bus != NULL);
- DBG_PORT(KERN_DEBUG "%s(0x%p, 0x%x) ->", __FUNCTION__, l, addr);
- t = READ_REG##size(PIOP_TO_GMMIO(LBA_DEV(l), addr));
- DBG_PORT(" 0x%xn", t);
- return (t);
- }
- LBA_PORT_IN( 8, 3)
- LBA_PORT_IN(16, 2)
- LBA_PORT_IN(32, 0)
- #undef LBA_PORT_OUT
- #define LBA_PORT_OUT(size, mask)
- static void lba_pat_out##size (struct pci_hba_data *l, u16 addr, u##size val)
- {
- void *where = (void *) PIOP_TO_GMMIO(LBA_DEV(l), addr);
- ASSERT(bus != NULL);
- DBG_PORT(KERN_DEBUG "%s(0x%p, 0x%x, 0x%x)n", __FUNCTION__, l, addr, val);
- WRITE_REG##size(val, where);
- /* flush the I/O down to the elroy at least */
- lba_t32 = READ_U32(l->base_addr + LBA_FUNC_ID);
- }
- LBA_PORT_OUT( 8, 3)
- LBA_PORT_OUT(16, 2)
- LBA_PORT_OUT(32, 0)
- static struct pci_port_ops lba_pat_port_ops = {
- lba_pat_in8, lba_pat_in16, lba_pat_in32,
- lba_pat_out8, lba_pat_out16, lba_pat_out32
- };
- /*
- ** make range information from PDC available to PCI subsystem.
- ** We make the PDC call here in order to get the PCI bus range
- ** numbers. The rest will get forwarded in pcibios_fixup_bus().
- ** We don't have a struct pci_bus assigned to us yet.
- */
- static void
- lba_pat_resources( struct hp_device *d, struct lba_device *lba_dev)
- {
- pdc_pat_cell_mod_maddr_block_t pa_pdc_cell; /* PA_VIEW */
- #ifdef DONT_NEED_THIS_FOR_ASTRO
- pdc_pat_cell_mod_maddr_block_t io_pdc_cell; /* IO_VIEW */
- long io_count;
- #endif
- long status; /* PDC return status */
- long pa_count;
- int i;
- /* return cell module (IO view) */
- status = pdc_pat_cell_module(& pdc_result, d->pcell_loc, d->mod_index,
- PA_VIEW, & pa_pdc_cell);
- pa_count = pa_pdc_cell.mod[1];
- #ifdef DONT_NEED_THIS_FOR_ASTRO
- status |= pdc_pat_cell_module(& pdc_result, d->pcell_loc, d->mod_index,
- IO_VIEW, & io_pdc_cell);
- io_count = io_pdc_cell.mod[1];
- #endif
- /* We've already done this once for device discovery...*/
- if (status != PDC_RET_OK) {
- panic("pdc_pat_cell_module() call failed for LBA!n");
- }
- if (PAT_GET_ENTITY(pa_pdc_cell.mod_info) != PAT_ENTITY_LBA) {
- panic("pdc_pat_cell_module() entity returned != PAT_ENTITY_LBA!n");
- }
- /*
- ** Inspect the resources PAT tells us about
- */
- for (i = 0; i < pa_count; i++) {
- struct {
- unsigned long type;
- unsigned long start;
- unsigned long end; /* aka finish */
- } *p;
- struct resource *r;
- p = (void *) &(pa_pdc_cell.mod[2+i*3]);
- /* Convert the PAT range data to PCI "struct resource" */
- switch(p->type & 0xff) {
- case PAT_PBNUM:
- lba_dev->hba.bus_num.start = p->start;
- lba_dev->hba.bus_num.end = p->end;
- break;
- case PAT_LMMIO:
- /* used to fix up pre-initialized MEM BARs */
- lba_dev->lmmio_base = p->start;
- r = &(lba_dev->hba.mem_space);
- r->name = "LBA LMMIO";
- r->start = p->start;
- r->end = p->end;
- r->flags = IORESOURCE_MEM;
- r->parent = r->sibling = r->child = NULL;
- break;
- case PAT_GMMIO:
- printk(KERN_WARNING MODULE_NAME
- " range[%d] : ignoring GMMIO (0x%lx)n",
- i, p->start);
- lba_dev->gmmio_base = p->start;
- break;
- case PAT_NPIOP:
- printk(KERN_WARNING MODULE_NAME
- " range[%d] : ignoring NPIOP (0x%lx)n",
- i, p->start);
- break;
- case PAT_PIOP:
- /*
- ** Postable I/O port space is per PCI host adapter.
- */
- /* save base of 64MB PIOP region */
- lba_dev->iop_base = p->start;
- r = &(lba_dev->hba.io_space);
- r->name = "LBA I/O Port";
- r->start = lba_dev->hba.hba_num << 16;
- r->end = r->start + 0xffffUL;
- r->flags = IORESOURCE_IO;
- r->parent = r->sibling = r->child = NULL;
- break;
- default:
- printk(KERN_WARNING MODULE_NAME
- " range[%d] : unknown pat range type (0x%lx)n",
- i, p->type & 0xff);
- break;
- }
- }
- }
- #endif /* __LP64__ */
- static void
- lba_legacy_resources( struct hp_device *d, struct lba_device *lba_dev)
- {
- int lba_num;
- struct resource *r;
- #ifdef __LP64__
- /*
- ** Used to sign extend instead BAR values are only 32-bit.
- ** 64-bit BARs have the upper 32-bit's zero'd by firmware.
- ** "Sprockets" PDC initializes for 32-bit OS.
- */
- lba_dev->lmmio_base = 0xffffffff00000000UL;
- #endif
- /*
- ** With "legacy" firmware, the lowest byte of FW_SCRATCH
- ** represents bus->secondary and the second byte represents
- ** bus->subsidiary (i.e. highest PPB programmed by firmware).
- ** PCI bus walk *should* end up with the same result.
- ** FIXME: But we don't have sanity checks in PCI or LBA.
- */
- lba_num = READ_REG32(d->hpa + LBA_FW_SCRATCH);
- r = &(lba_dev->hba.bus_num);
- r->name = "LBA PCI Busses";
- r->start = lba_num & 0xff;
- r->end = (lba_num>>8) & 0xff;
- /* Set up local PCI Bus resources - we don't really need
- ** them for Legacy boxes but it's nice to see in /proc.
- */
- r = &(lba_dev->hba.mem_space);
- r->name = "LBA PCI LMMIO";
- r->flags = IORESOURCE_MEM;
- r->start = READ_REG32(d->hpa + LBA_LMMIO_BASE);
- r->end = r->start + ~ (READ_REG32(d->hpa + LBA_LMMIO_MASK));
- r = &(lba_dev->hba.io_space);
- r->name = "LBA PCI I/O Ports";
- r->flags = IORESOURCE_IO;
- r->start = READ_REG32(d->hpa + LBA_IOS_BASE);
- r->end = r->start + (READ_REG32(d->hpa + LBA_IOS_MASK) ^ 0xffff);
- lba_num = lba_dev->hba.hba_num << 16;
- r->start |= lba_num;
- r->end |= lba_num;
- }
- /**************************************************************************
- **
- ** LBA initialization code (HW and SW)
- **
- ** o identify LBA chip itself
- ** o initialize LBA chip modes (HardFail)
- ** o FIXME: initialize DMA hints for reasonable defaults
- ** o enable configuration functions
- ** o call pci_register_ops() to discover devs (fixup/fixup_bus get invoked)
- **
- **************************************************************************/
- static void
- lba_hw_init(struct lba_device *d)
- {
- u32 stat;
- /* Set HF mode as the default (vs. -1 mode). */
- stat = READ_REG32(d->hba.base_addr + LBA_STAT_CTL);
- WRITE_REG32(stat | HF_ENABLE, d->hba.base_addr + LBA_STAT_CTL);
- /*
- ** FIXME: Hint registers are programmed with default hint
- ** values by firmware. Hints should be sane even if we
- ** can't reprogram them the way drivers want.
- */
- }
- static void
- lba_common_init(struct lba_device *lba_dev)
- {
- pci_bios = &lba_bios_ops;
- pcibios_register_hba((struct pci_hba_data *)lba_dev);
- lba_dev->lba_lock = SPIN_LOCK_UNLOCKED;
- /*
- ** Set flags which depend on hw_rev
- */
- if (!LBA_TR4PLUS(lba_dev)) {
- lba_dev->flags |= LBA_FLAG_NO_DMA_DURING_CFG;
- }
- }
- /*
- ** Determine if lba should claim this chip (return 0) or not (return 1).
- ** If so, initialize the chip and tell other partners in crime they
- ** have work to do.
- */
- static __init int
- lba_driver_callback(struct hp_device *d, struct pa_iodc_driver *dri)
- {
- struct lba_device *lba_dev;
- struct pci_bus *lba_bus;
- u32 func_class;
- void *tmp_obj;
- /* from drivers/pci/setup-bus.c */
- extern void __init pbus_set_ranges(struct pci_bus *, struct pbus_set_ranges_data *);
- /* Read HW Rev First */
- func_class = READ_REG32(d->hpa + LBA_FCLASS);
- func_class &= 0xf;
- switch (func_class) {
- case 0: dri->version = "TR1.0"; break;
- case 1: dri->version = "TR2.0"; break;
- case 2: dri->version = "TR2.1"; break;
- case 3: dri->version = "TR2.2"; break;
- case 4: dri->version = "TR3.0"; break;
- case 5: dri->version = "TR4.0"; break;
- default: dri->version = "TR4+";
- }
- printk("%s version %s (0x%x) found at 0x%pn", dri->name, dri->version, func_class & 0xf, d->hpa);
- /* Just in case we find some prototypes... */
- if (func_class < 2) {
- printk(KERN_WARNING "Can't support LBA older than TR2.1 "
- "- continuing under adversity.n");
- }
- /*
- ** Tell I/O SAPIC driver we have a IRQ handler/region.
- */
- tmp_obj = iosapic_register(d->hpa+LBA_IOSAPIC_BASE);
- if (NULL == tmp_obj) {
- /* iosapic may have failed. But more likely the
- ** slot isn't occupied and thus has no IRT entries.
- ** iosapic_register looks for this iosapic in the IRT
- ** before bothering to allocating data structures
- ** we don't need.
- */
- DBG(KERN_WARNING MODULE_NAME ": iosapic_register says not usedn");
- return (1);
- }
- lba_dev = kmalloc(sizeof(struct lba_device), GFP_KERNEL);
- if (NULL == lba_dev)
- {
- printk("lba_init_chip - couldn't alloc lba_devicen");
- return(1);
- }
- memset(lba_dev, 0, sizeof(struct lba_device));
- /* ---------- First : initialize data we already have --------- */
- /*
- ** Need hw_rev to adjust configuration space behavior.
- ** LBA_TR4PLUS macro uses hw_rev field.
- */
- lba_dev->hw_rev = func_class;
- lba_dev->hba.base_addr = d->hpa; /* faster access */
- lba_dev->iosapic_obj = tmp_obj; /* save interrupt handle */
- /* ------------ Second : initialize common stuff ---------- */
- lba_common_init(lba_dev);
- lba_hw_init(lba_dev);
- /* ---------- Third : setup I/O Port and MMIO resources --------- */
- #ifdef __LP64__
- if (pdc_pat) {
- /* PDC PAT firmware uses PIOP region of GMMIO space. */
- pci_port = &lba_pat_port_ops;
- /* Go ask PDC PAT what resources this LBA has */
- lba_pat_resources(d, lba_dev);
- } else {
- #endif
- /* Sprockets PDC uses NPIOP region */
- pci_port = &lba_astro_port_ops;
- /* Poke the chip a bit for /proc output */
- lba_legacy_resources(d, lba_dev);
- #ifdef __LP64__
- }
- #endif
- /*
- ** Tell PCI support another PCI bus was found.
- ** Walks PCI bus for us too.
- */
- lba_bus = lba_dev->hba.hba_bus =
- pci_scan_bus( lba_dev->hba.bus_num.start, &lba_cfg_ops, (void *) lba_dev);
- #ifdef __LP64__
- if (pdc_pat) {
- /* determine window sizes needed by PCI-PCI bridges */
- DBG_PAT("LBA pcibios_size_bridge()n");
- pcibios_size_bridge(lba_bus, NULL);
- /* assign resources to un-initialized devices */
- DBG_PAT("LBA pcibios_assign_unassigned_resources()n");
- pcibios_assign_unassigned_resources(lba_bus);
- #ifdef DEBUG_LBA_PAT
- DBG_PAT("nLBA PIOP resource treen");
- lba_dump_res(&lba_dev->hba.io_space, 2);
- DBG_PAT("nLBA LMMIO resource treen");
- lba_dump_res(&lba_dev->hba.mem_space, 2);
- #endif
- /* program *all* PCI-PCI bridge range registers */
- DBG_PAT("LBA pbus_set_ranges()n");
- pbus_set_ranges(lba_bus, NULL);
- }
- #endif /* __LP64__ */
- /*
- ** Once PCI register ops has walked the bus, access to config
- ** space is restricted. Avoids master aborts on config cycles.
- ** Early LBA revs go fatal on *any* master abort.
- */
- if (!LBA_TR4PLUS(lba_dev)) {
- lba_dev->flags |= LBA_FLAG_SKIP_PROBE;
- }
- /* Whew! Finally done! Tell services we got this one covered. */
- return 0;
- }
- /*
- ** Initialize the IBASE/IMASK registers for LBA (Elroy).
- ** Only called from sba_iommu.c initialization sequence.
- */
- void lba_init_iregs(void *sba_hpa, u32 ibase, u32 imask)
- {
- extern struct pci_hba_data *hba_list; /* arch/parisc/kernel/pci.c */
- struct pci_hba_data *lba;
- imask <<= 2; /* adjust for hints - 2 more bits */
- ASSERT((ibase & 0x003fffff) == 0);
- ASSERT((imask & 0x003fffff) == 0);
-
- /* FIXME: sba_hpa is intended to search some table to
- ** determine which LBA's belong to the caller's SBA.
- ** IS_ASTRO: just assume only one SBA for now.
- */
- ASSERT(NULL != hba_list);
- DBG(KERN_DEBUG "%s() ibase 0x%x imask 0x%xn", __FUNCTION__, ibase, imask);
- for (lba = hba_list; NULL != lba; lba = lba->next) {
- DBG(KERN_DEBUG "%s() base_addr %pn", __FUNCTION__, lba->base_addr);
- WRITE_REG32( imask, lba->base_addr + LBA_IMASK);
- WRITE_REG32( ibase, lba->base_addr + LBA_IBASE);
- }
- DBG(KERN_DEBUG "%s() donen", __FUNCTION__);
- }