| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Daniel Hellstrom | 4173 | 98.75% | 5 | 26.32% |
| Konrad Eisele | 28 | 0.66% | 2 | 10.53% |
| Sam Ravnborg | 11 | 0.26% | 2 | 10.53% |
| Linus Torvalds (pre-git) | 4 | 0.09% | 2 | 10.53% |
| Paul Gortmaker | 4 | 0.09% | 2 | 10.53% |
| David S. Miller | 1 | 0.02% | 1 | 5.26% |
| Ralf Baechle | 1 | 0.02% | 1 | 5.26% |
| Rob Herring | 1 | 0.02% | 1 | 5.26% |
| Greg Kroah-Hartman | 1 | 0.02% | 1 | 5.26% |
| Arvind Yadav | 1 | 0.02% | 1 | 5.26% |
| Björn Helgaas | 1 | 0.02% | 1 | 5.26% |
| Total | 4226 | 19 |
// SPDX-License-Identifier: GPL-2.0 /* * leon_pci_grpci2.c: GRPCI2 Host PCI driver * * Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom * */ #include <linux/kernel.h> #include <linux/pci.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/export.h> #include <linux/of.h> #include <linux/platform_device.h> #include <asm/io.h> #include <asm/leon.h> #include <asm/vaddrs.h> #include <asm/sections.h> #include <asm/leon_pci.h> #include "irq.h" struct grpci2_barcfg { unsigned long pciadr; /* PCI Space Address */ unsigned long ahbadr; /* PCI Base address mapped to this AHB addr */ }; /* Device Node Configuration options: * - barcfgs : Custom Configuration of Host's 6 target BARs * - irq_mask : Limit which PCI interrupts are enabled * - do_reset : Force PCI Reset on startup * * barcfgs * ======= * * Optional custom Target BAR configuration (see struct grpci2_barcfg). All * addresses are physical. Array always contains 6 elements (len=2*4*6 bytes) * * -1 means not configured (let host driver do default setup). * * [i*2+0] = PCI Address of BAR[i] on target interface * [i*2+1] = Accessing PCI address of BAR[i] result in this AMBA address * * * irq_mask * ======== * * Limit which PCI interrupts are enabled. 0=Disable, 1=Enable. By default * all are enabled. Use this when PCI interrupt pins are floating on PCB. * int, len=4. * bit0 = PCI INTA# * bit1 = PCI INTB# * bit2 = PCI INTC# * bit3 = PCI INTD# * * * reset * ===== * * Force PCI reset on startup. int, len=4 */ /* Enable Debugging Configuration Space Access */ #undef GRPCI2_DEBUG_CFGACCESS /* * GRPCI2 APB Register MAP */ struct grpci2_regs { unsigned int ctrl; /* 0x00 Control */ unsigned int sts_cap; /* 0x04 Status / Capabilities */ int res1; /* 0x08 */ unsigned int io_map; /* 0x0C I/O Map address */ unsigned int dma_ctrl; /* 0x10 DMA */ unsigned int dma_bdbase; /* 0x14 DMA */ int res2[2]; /* 0x18 */ unsigned int bars[6]; /* 0x20 read-only PCI BARs */ int res3[2]; /* 0x38 */ unsigned int ahbmst_map[16]; /* 0x40 AHB->PCI Map per AHB Master */ /* PCI Trace Buffer Registers (OPTIONAL) */ unsigned int t_ctrl; /* 0x80 */ unsigned int t_cnt; /* 0x84 */ unsigned int t_adpat; /* 0x88 */ unsigned int t_admask; /* 0x8C */ unsigned int t_sigpat; /* 0x90 */ unsigned int t_sigmask; /* 0x94 */ unsigned int t_adstate; /* 0x98 */ unsigned int t_sigstate; /* 0x9C */ }; #define REGLOAD(a) (be32_to_cpu(__raw_readl(&(a)))) #define REGSTORE(a, v) (__raw_writel(cpu_to_be32(v), &(a))) #define CTRL_BUS_BIT 16 #define CTRL_RESET (1<<31) #define CTRL_SI (1<<27) #define CTRL_PE (1<<26) #define CTRL_EI (1<<25) #define CTRL_ER (1<<24) #define CTRL_BUS (0xff<<CTRL_BUS_BIT) #define CTRL_HOSTINT 0xf #define STS_HOST_BIT 31 #define STS_MST_BIT 30 #define STS_TAR_BIT 29 #define STS_DMA_BIT 28 #define STS_DI_BIT 27 #define STS_HI_BIT 26 #define STS_IRQMODE_BIT 24 #define STS_TRACE_BIT 23 #define STS_CFGERRVALID_BIT 20 #define STS_CFGERR_BIT 19 #define STS_INTTYPE_BIT 12 #define STS_INTSTS_BIT 8 #define STS_FDEPTH_BIT 2 #define STS_FNUM_BIT 0 #define STS_HOST (1<<STS_HOST_BIT) #define STS_MST (1<<STS_MST_BIT) #define STS_TAR (1<<STS_TAR_BIT) #define STS_DMA (1<<STS_DMA_BIT) #define STS_DI (1<<STS_DI_BIT) #define STS_HI (1<<STS_HI_BIT) #define STS_IRQMODE (0x3<<STS_IRQMODE_BIT) #define STS_TRACE (1<<STS_TRACE_BIT) #define STS_CFGERRVALID (1<<STS_CFGERRVALID_BIT) #define STS_CFGERR (1<<STS_CFGERR_BIT) #define STS_INTTYPE (0x3f<<STS_INTTYPE_BIT) #define STS_INTSTS (0xf<<STS_INTSTS_BIT) #define STS_FDEPTH (0x7<<STS_FDEPTH_BIT) #define STS_FNUM (0x3<<STS_FNUM_BIT) #define STS_ISYSERR (1<<17) #define STS_IDMA (1<<16) #define STS_IDMAERR (1<<15) #define STS_IMSTABRT (1<<14) #define STS_ITGTABRT (1<<13) #define STS_IPARERR (1<<12) #define STS_ERR_IRQ (STS_ISYSERR | STS_IMSTABRT | STS_ITGTABRT | STS_IPARERR) struct grpci2_bd_chan { unsigned int ctrl; /* 0x00 DMA Control */ unsigned int nchan; /* 0x04 Next DMA Channel Address */ unsigned int nbd; /* 0x08 Next Data Descriptor in chan */ unsigned int res; /* 0x0C Reserved */ }; #define BD_CHAN_EN 0x80000000 #define BD_CHAN_TYPE 0x00300000 #define BD_CHAN_BDCNT 0x0000ffff #define BD_CHAN_EN_BIT 31 #define BD_CHAN_TYPE_BIT 20 #define BD_CHAN_BDCNT_BIT 0 struct grpci2_bd_data { unsigned int ctrl; /* 0x00 DMA Data Control */ unsigned int pci_adr; /* 0x04 PCI Start Address */ unsigned int ahb_adr; /* 0x08 AHB Start address */ unsigned int next; /* 0x0C Next Data Descriptor in chan */ }; #define BD_DATA_EN 0x80000000 #define BD_DATA_IE 0x40000000 #define BD_DATA_DR 0x20000000 #define BD_DATA_TYPE 0x00300000 #define BD_DATA_ER 0x00080000 #define BD_DATA_LEN 0x0000ffff #define BD_DATA_EN_BIT 31 #define BD_DATA_IE_BIT 30 #define BD_DATA_DR_BIT 29 #define BD_DATA_TYPE_BIT 20 #define BD_DATA_ER_BIT 19 #define BD_DATA_LEN_BIT 0 /* GRPCI2 Capability */ struct grpci2_cap_first { unsigned int ctrl; unsigned int pci2ahb_map[6]; unsigned int ext2ahb_map; unsigned int io_map; unsigned int pcibar_size[6]; }; #define CAP9_CTRL_OFS 0 #define CAP9_BAR_OFS 0x4 #define CAP9_IOMAP_OFS 0x20 #define CAP9_BARSIZE_OFS 0x24 #define TGT 256 struct grpci2_priv { struct leon_pci_info info; /* must be on top of this structure */ struct grpci2_regs __iomem *regs; char irq; char irq_mode; /* IRQ Mode from CAPSTS REG */ char bt_enabled; char do_reset; char irq_mask; u32 pciid; /* PCI ID of Host */ unsigned char irq_map[4]; /* Virtual IRQ numbers */ unsigned int virq_err; unsigned int virq_dma; /* AHB PCI Windows */ unsigned long pci_area; /* MEMORY */ unsigned long pci_area_end; unsigned long pci_io; /* I/O */ unsigned long pci_conf; /* CONFIGURATION */ unsigned long pci_conf_end; unsigned long pci_io_va; struct grpci2_barcfg tgtbars[6]; }; static DEFINE_SPINLOCK(grpci2_dev_lock); static struct grpci2_priv *grpci2priv; static int grpci2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) { struct grpci2_priv *priv = dev->bus->sysdata; int irq_group; /* Use default IRQ decoding on PCI BUS0 according slot numbering */ irq_group = slot & 0x3; pin = ((pin - 1) + irq_group) & 0x3; return priv->irq_map[pin]; } static int grpci2_cfg_r32(struct grpci2_priv *priv, unsigned int bus, unsigned int devfn, int where, u32 *val) { unsigned int *pci_conf; unsigned long flags; u32 tmp; if (where & 0x3) return -EINVAL; if (bus == 0) { devfn += (0x8 * 6); /* start at AD16=Device0 */ } else if (bus == TGT) { bus = 0; devfn = 0; /* special case: bridge controller itself */ } /* Select bus */ spin_lock_irqsave(&grpci2_dev_lock, flags); REGSTORE(priv->regs->ctrl, (REGLOAD(priv->regs->ctrl) & ~(0xff << 16)) | (bus << 16)); spin_unlock_irqrestore(&grpci2_dev_lock, flags); /* clear old status */ REGSTORE(priv->regs->sts_cap, (STS_CFGERR | STS_CFGERRVALID)); pci_conf = (unsigned int *) (priv->pci_conf | (devfn << 8) | (where & 0xfc)); tmp = LEON3_BYPASS_LOAD_PA(pci_conf); /* Wait until GRPCI2 signals that CFG access is done, it should be * done instantaneously unless a DMA operation is ongoing... */ while ((REGLOAD(priv->regs->sts_cap) & STS_CFGERRVALID) == 0) ; if (REGLOAD(priv->regs->sts_cap) & STS_CFGERR) { *val = 0xffffffff; } else { /* Bus always little endian (unaffected by byte-swapping) */ *val = swab32(tmp); } return 0; } static int grpci2_cfg_r16(struct grpci2_priv *priv, unsigned int bus, unsigned int devfn, int where, u32 *val) { u32 v; int ret; if (where & 0x1) return -EINVAL; ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v); *val = 0xffff & (v >> (8 * (where & 0x3))); return ret; } static int grpci2_cfg_r8(struct grpci2_priv *priv, unsigned int bus, unsigned int devfn, int where, u32 *val) { u32 v; int ret; ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v); *val = 0xff & (v >> (8 * (where & 3))); return ret; } static int grpci2_cfg_w32(struct grpci2_priv *priv, unsigned int bus, unsigned int devfn, int where, u32 val) { unsigned int *pci_conf; unsigned long flags; if (where & 0x3) return -EINVAL; if (bus == 0) { devfn += (0x8 * 6); /* start at AD16=Device0 */ } else if (bus == TGT) { bus = 0; devfn = 0; /* special case: bridge controller itself */ } /* Select bus */ spin_lock_irqsave(&grpci2_dev_lock, flags); REGSTORE(priv->regs->ctrl, (REGLOAD(priv->regs->ctrl) & ~(0xff << 16)) | (bus << 16)); spin_unlock_irqrestore(&grpci2_dev_lock, flags); /* clear old status */ REGSTORE(priv->regs->sts_cap, (STS_CFGERR | STS_CFGERRVALID)); pci_conf = (unsigned int *) (priv->pci_conf | (devfn << 8) | (where & 0xfc)); LEON3_BYPASS_STORE_PA(pci_conf, swab32(val)); /* Wait until GRPCI2 signals that CFG access is done, it should be * done instantaneously unless a DMA operation is ongoing... */ while ((REGLOAD(priv->regs->sts_cap) & STS_CFGERRVALID) == 0) ; return 0; } static int grpci2_cfg_w16(struct grpci2_priv *priv, unsigned int bus, unsigned int devfn, int where, u32 val) { int ret; u32 v; if (where & 0x1) return -EINVAL; ret = grpci2_cfg_r32(priv, bus, devfn, where&~3, &v); if (ret) return ret; v = (v & ~(0xffff << (8 * (where & 0x3)))) | ((0xffff & val) << (8 * (where & 0x3))); return grpci2_cfg_w32(priv, bus, devfn, where & ~0x3, v); } static int grpci2_cfg_w8(struct grpci2_priv *priv, unsigned int bus, unsigned int devfn, int where, u32 val) { int ret; u32 v; ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v); if (ret != 0) return ret; v = (v & ~(0xff << (8 * (where & 0x3)))) | ((0xff & val) << (8 * (where & 0x3))); return grpci2_cfg_w32(priv, bus, devfn, where & ~0x3, v); } /* Read from Configuration Space. When entering here the PCI layer has taken * the pci_lock spinlock and IRQ is off. */ static int grpci2_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { struct grpci2_priv *priv = grpci2priv; unsigned int busno = bus->number; int ret; if (PCI_SLOT(devfn) > 15 || busno > 255) { *val = ~0; return 0; } switch (size) { case 1: ret = grpci2_cfg_r8(priv, busno, devfn, where, val); break; case 2: ret = grpci2_cfg_r16(priv, busno, devfn, where, val); break; case 4: ret = grpci2_cfg_r32(priv, busno, devfn, where, val); break; default: ret = -EINVAL; break; } #ifdef GRPCI2_DEBUG_CFGACCESS printk(KERN_INFO "grpci2_read_config: [%02x:%02x:%x] ofs=%d val=%x " "size=%d\n", busno, PCI_SLOT(devfn), PCI_FUNC(devfn), where, *val, size); #endif return ret; } /* Write to Configuration Space. When entering here the PCI layer has taken * the pci_lock spinlock and IRQ is off. */ static int grpci2_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { struct grpci2_priv *priv = grpci2priv; unsigned int busno = bus->number; if (PCI_SLOT(devfn) > 15 || busno > 255) return 0; #ifdef GRPCI2_DEBUG_CFGACCESS printk(KERN_INFO "grpci2_write_config: [%02x:%02x:%x] ofs=%d size=%d " "val=%x\n", busno, PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val); #endif switch (size) { default: return -EINVAL; case 1: return grpci2_cfg_w8(priv, busno, devfn, where, val); case 2: return grpci2_cfg_w16(priv, busno, devfn, where, val); case 4: return grpci2_cfg_w32(priv, busno, devfn, where, val); } } static struct pci_ops grpci2_ops = { .read = grpci2_read_config, .write = grpci2_write_config, }; /* GENIRQ IRQ chip implementation for GRPCI2 irqmode=0..2. In configuration * 3 where all PCI Interrupts has a separate IRQ on the system IRQ controller * this is not needed and the standard IRQ controller can be used. */ static void grpci2_mask_irq(struct irq_data *data) { unsigned long flags; unsigned int irqidx; struct grpci2_priv *priv = grpci2priv; irqidx = (unsigned int)data->chip_data - 1; if (irqidx > 3) /* only mask PCI interrupts here */ return; spin_lock_irqsave(&grpci2_dev_lock, flags); REGSTORE(priv->regs->ctrl, REGLOAD(priv->regs->ctrl) & ~(1 << irqidx)); spin_unlock_irqrestore(&grpci2_dev_lock, flags); } static void grpci2_unmask_irq(struct irq_data *data) { unsigned long flags; unsigned int irqidx; struct grpci2_priv *priv = grpci2priv; irqidx = (unsigned int)data->chip_data - 1; if (irqidx > 3) /* only unmask PCI interrupts here */ return; spin_lock_irqsave(&grpci2_dev_lock, flags); REGSTORE(priv->regs->ctrl, REGLOAD(priv->regs->ctrl) | (1 << irqidx)); spin_unlock_irqrestore(&grpci2_dev_lock, flags); } static unsigned int grpci2_startup_irq(struct irq_data *data) { grpci2_unmask_irq(data); return 0; } static void grpci2_shutdown_irq(struct irq_data *data) { grpci2_mask_irq(data); } static struct irq_chip grpci2_irq = { .name = "grpci2", .irq_startup = grpci2_startup_irq, .irq_shutdown = grpci2_shutdown_irq, .irq_mask = grpci2_mask_irq, .irq_unmask = grpci2_unmask_irq, }; /* Handle one or multiple IRQs from the PCI core */ static void grpci2_pci_flow_irq(struct irq_desc *desc) { struct grpci2_priv *priv = grpci2priv; int i, ack = 0; unsigned int ctrl, sts_cap, pci_ints; ctrl = REGLOAD(priv->regs->ctrl); sts_cap = REGLOAD(priv->regs->sts_cap); /* Error Interrupt? */ if (sts_cap & STS_ERR_IRQ) { generic_handle_irq(priv->virq_err); ack = 1; } /* PCI Interrupt? */ pci_ints = ((~sts_cap) >> STS_INTSTS_BIT) & ctrl & CTRL_HOSTINT; if (pci_ints) { /* Call respective PCI Interrupt handler */ for (i = 0; i < 4; i++) { if (pci_ints & (1 << i)) generic_handle_irq(priv->irq_map[i]); } ack = 1; } /* * Decode DMA Interrupt only when shared with Err and PCI INTX#, when * the DMA is a unique IRQ the DMA interrupts doesn't end up here, they * goes directly to DMA ISR. */ if ((priv->irq_mode == 0) && (sts_cap & (STS_IDMA | STS_IDMAERR))) { generic_handle_irq(priv->virq_dma); ack = 1; } /* * Call "first level" IRQ chip end-of-irq handler. It will ACK LEON IRQ * Controller, this must be done after IRQ sources have been handled to * avoid double IRQ generation */ if (ack) desc->irq_data.chip->irq_eoi(&desc->irq_data); } /* Create a virtual IRQ */ static unsigned int grpci2_build_device_irq(unsigned int irq) { unsigned int virq = 0, pil; pil = 1 << 8; virq = irq_alloc(irq, pil); if (virq == 0) goto out; irq_set_chip_and_handler_name(virq, &grpci2_irq, handle_simple_irq, "pcilvl"); irq_set_chip_data(virq, (void *)irq); out: return virq; } static void grpci2_hw_init(struct grpci2_priv *priv) { u32 ahbadr, pciadr, bar_sz, capptr, io_map, data; struct grpci2_regs __iomem *regs = priv->regs; int i; struct grpci2_barcfg *barcfg = priv->tgtbars; /* Reset any earlier setup */ if (priv->do_reset) { printk(KERN_INFO "GRPCI2: Resetting PCI bus\n"); REGSTORE(regs->ctrl, CTRL_RESET); ssleep(1); /* Wait for boards to settle */ } REGSTORE(regs->ctrl, 0); REGSTORE(regs->sts_cap, ~0); /* Clear Status */ REGSTORE(regs->dma_ctrl, 0); REGSTORE(regs->dma_bdbase, 0); /* Translate I/O accesses to 0, I/O Space always @ PCI low 64Kbytes */ REGSTORE(regs->io_map, REGLOAD(regs->io_map) & 0x0000ffff); /* set 1:1 mapping between AHB -> PCI memory space, for all Masters * Each AHB master has its own mapping registers. Max 16 AHB masters. */ for (i = 0; i < 16; i++) REGSTORE(regs->ahbmst_map[i], priv->pci_area); /* Get the GRPCI2 Host PCI ID */ grpci2_cfg_r32(priv, TGT, 0, PCI_VENDOR_ID, &priv->pciid); /* Get address to first (always defined) capability structure */ grpci2_cfg_r8(priv, TGT, 0, PCI_CAPABILITY_LIST, &capptr); /* Enable/Disable Byte twisting */ grpci2_cfg_r32(priv, TGT, 0, capptr+CAP9_IOMAP_OFS, &io_map); io_map = (io_map & ~0x1) | (priv->bt_enabled ? 1 : 0); grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_IOMAP_OFS, io_map); /* Setup the Host's PCI Target BARs for other peripherals to access, * and do DMA to the host's memory. The target BARs can be sized and * enabled individually. * * User may set custom target BARs, but default is: * The first BARs is used to map kernel low (DMA is part of normal * region on sparc which is SRMMU_MAXMEM big) main memory 1:1 to the * PCI bus, the other BARs are disabled. We assume that the first BAR * is always available. */ for (i = 0; i < 6; i++) { if (barcfg[i].pciadr != ~0 && barcfg[i].ahbadr != ~0) { /* Target BARs must have the proper alignment */ ahbadr = barcfg[i].ahbadr; pciadr = barcfg[i].pciadr; bar_sz = ((pciadr - 1) & ~pciadr) + 1; } else { if (i == 0) { /* Map main memory */ bar_sz = 0xf0000008; /* 256MB prefetchable */ ahbadr = 0xf0000000 & (u32)__pa(PAGE_ALIGN( (unsigned long) &_end)); pciadr = ahbadr; } else { bar_sz = 0; ahbadr = 0; pciadr = 0; } } grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_BARSIZE_OFS+i*4, bar_sz); grpci2_cfg_w32(priv, TGT, 0, PCI_BASE_ADDRESS_0+i*4, pciadr); grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_BAR_OFS+i*4, ahbadr); printk(KERN_INFO " TGT BAR[%d]: 0x%08x (PCI)-> 0x%08x\n", i, pciadr, ahbadr); } /* set as bus master and enable pci memory responses */ grpci2_cfg_r32(priv, TGT, 0, PCI_COMMAND, &data); data |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); grpci2_cfg_w32(priv, TGT, 0, PCI_COMMAND, data); /* Enable Error respone (CPU-TRAP) on illegal memory access. */ REGSTORE(regs->ctrl, CTRL_ER | CTRL_PE); } static irqreturn_t grpci2_jump_interrupt(int irq, void *arg) { printk(KERN_ERR "GRPCI2: Jump IRQ happened\n"); return IRQ_NONE; } /* Handle GRPCI2 Error Interrupt */ static irqreturn_t grpci2_err_interrupt(int irq, void *arg) { struct grpci2_priv *priv = arg; struct grpci2_regs __iomem *regs = priv->regs; unsigned int status; status = REGLOAD(regs->sts_cap); if ((status & STS_ERR_IRQ) == 0) return IRQ_NONE; if (status & STS_IPARERR) printk(KERN_ERR "GRPCI2: Parity Error\n"); if (status & STS_ITGTABRT) printk(KERN_ERR "GRPCI2: Target Abort\n"); if (status & STS_IMSTABRT) printk(KERN_ERR "GRPCI2: Master Abort\n"); if (status & STS_ISYSERR) printk(KERN_ERR "GRPCI2: System Error\n"); /* Clear handled INT TYPE IRQs */ REGSTORE(regs->sts_cap, status & STS_ERR_IRQ); return IRQ_HANDLED; } static int grpci2_of_probe(struct platform_device *ofdev) { struct grpci2_regs __iomem *regs; struct grpci2_priv *priv; int err, i, len; const int *tmp; unsigned int capability; if (grpci2priv) { printk(KERN_ERR "GRPCI2: only one GRPCI2 core supported\n"); return -ENODEV; } if (ofdev->num_resources < 3) { printk(KERN_ERR "GRPCI2: not enough APB/AHB resources\n"); return -EIO; } /* Find Device Address */ regs = of_ioremap(&ofdev->resource[0], 0, resource_size(&ofdev->resource[0]), "grlib-grpci2 regs"); if (regs == NULL) { printk(KERN_ERR "GRPCI2: ioremap failed\n"); return -EIO; } /* * Check that we're in Host Slot and that we can act as a Host Bridge * and not only as target. */ capability = REGLOAD(regs->sts_cap); if ((capability & STS_HOST) || !(capability & STS_MST)) { printk(KERN_INFO "GRPCI2: not in host system slot\n"); err = -EIO; goto err1; } priv = grpci2priv = kzalloc(sizeof(struct grpci2_priv), GFP_KERNEL); if (grpci2priv == NULL) { err = -ENOMEM; goto err1; } priv->regs = regs; priv->irq = ofdev->archdata.irqs[0]; /* BASE IRQ */ priv->irq_mode = (capability & STS_IRQMODE) >> STS_IRQMODE_BIT; printk(KERN_INFO "GRPCI2: host found at %p, irq%d\n", regs, priv->irq); /* Byte twisting should be made configurable from kernel command line */ priv->bt_enabled = 1; /* Let user do custom Target BAR assignment */ tmp = of_get_property(ofdev->dev.of_node, "barcfg", &len); if (tmp && (len == 2*4*6)) memcpy(priv->tgtbars, tmp, 2*4*6); else memset(priv->tgtbars, -1, 2*4*6); /* Limit IRQ unmasking in irq_mode 2 and 3 */ tmp = of_get_property(ofdev->dev.of_node, "irq_mask", &len); if (tmp && (len == 4)) priv->do_reset = *tmp; else priv->irq_mask = 0xf; /* Optional PCI reset. Force PCI reset on startup */ tmp = of_get_property(ofdev->dev.of_node, "reset", &len); if (tmp && (len == 4)) priv->do_reset = *tmp; else priv->do_reset = 0; /* Find PCI Memory, I/O and Configuration Space Windows */ priv->pci_area = ofdev->resource[1].start; priv->pci_area_end = ofdev->resource[1].end+1; priv->pci_io = ofdev->resource[2].start; priv->pci_conf = ofdev->resource[2].start + 0x10000; priv->pci_conf_end = priv->pci_conf + 0x10000; priv->pci_io_va = (unsigned long)ioremap(priv->pci_io, 0x10000); if (!priv->pci_io_va) { err = -EIO; goto err2; } printk(KERN_INFO "GRPCI2: MEMORY SPACE [0x%08lx - 0x%08lx]\n" " I/O SPACE [0x%08lx - 0x%08lx]\n" " CONFIG SPACE [0x%08lx - 0x%08lx]\n", priv->pci_area, priv->pci_area_end-1, priv->pci_io, priv->pci_conf-1, priv->pci_conf, priv->pci_conf_end-1); /* * I/O Space resources in I/O Window mapped into Virtual Adr Space * We never use low 4KB because some devices seem have problems using * address 0. */ memset(&priv->info.io_space, 0, sizeof(struct resource)); priv->info.io_space.name = "GRPCI2 PCI I/O Space"; priv->info.io_space.start = priv->pci_io_va + 0x1000; priv->info.io_space.end = priv->pci_io_va + 0x10000 - 1; priv->info.io_space.flags = IORESOURCE_IO; /* * GRPCI2 has no prefetchable memory, map everything as * non-prefetchable memory */ memset(&priv->info.mem_space, 0, sizeof(struct resource)); priv->info.mem_space.name = "GRPCI2 PCI MEM Space"; priv->info.mem_space.start = priv->pci_area; priv->info.mem_space.end = priv->pci_area_end - 1; priv->info.mem_space.flags = IORESOURCE_MEM; if (request_resource(&iomem_resource, &priv->info.mem_space) < 0) goto err3; if (request_resource(&ioport_resource, &priv->info.io_space) < 0) goto err4; /* setup maximum supported PCI buses */ priv->info.busn.name = "GRPCI2 busn"; priv->info.busn.start = 0; priv->info.busn.end = 255; grpci2_hw_init(priv); /* * Get PCI Interrupt to System IRQ mapping and setup IRQ handling * Error IRQ always on PCI INTA. */ if (priv->irq_mode < 2) { /* All PCI interrupts are shared using the same system IRQ */ leon_update_virq_handling(priv->irq, grpci2_pci_flow_irq, "pcilvl", 0); priv->irq_map[0] = grpci2_build_device_irq(1); priv->irq_map[1] = grpci2_build_device_irq(2); priv->irq_map[2] = grpci2_build_device_irq(3); priv->irq_map[3] = grpci2_build_device_irq(4); priv->virq_err = grpci2_build_device_irq(5); if (priv->irq_mode & 1) priv->virq_dma = ofdev->archdata.irqs[1]; else priv->virq_dma = grpci2_build_device_irq(6); /* Enable IRQs on LEON IRQ controller */ err = request_irq(priv->irq, grpci2_jump_interrupt, 0, "GRPCI2_JUMP", priv); if (err) printk(KERN_ERR "GRPCI2: ERR IRQ request failed\n"); } else { /* All PCI interrupts have an unique IRQ interrupt */ for (i = 0; i < 4; i++) { /* Make LEON IRQ layer handle level IRQ by acking */ leon_update_virq_handling(ofdev->archdata.irqs[i], handle_fasteoi_irq, "pcilvl", 1); priv->irq_map[i] = ofdev->archdata.irqs[i]; } priv->virq_err = priv->irq_map[0]; if (priv->irq_mode & 1) priv->virq_dma = ofdev->archdata.irqs[4]; else priv->virq_dma = priv->irq_map[0]; /* Unmask all PCI interrupts, request_irq will not do that */ REGSTORE(regs->ctrl, REGLOAD(regs->ctrl)|(priv->irq_mask&0xf)); } /* Setup IRQ handler for non-configuration space access errors */ err = request_irq(priv->virq_err, grpci2_err_interrupt, IRQF_SHARED, "GRPCI2_ERR", priv); if (err) { printk(KERN_DEBUG "GRPCI2: ERR VIRQ request failed: %d\n", err); goto err5; } /* * Enable Error Interrupts. PCI interrupts are unmasked once request_irq * is called by the PCI Device drivers */ REGSTORE(regs->ctrl, REGLOAD(regs->ctrl) | CTRL_EI | CTRL_SI); /* Init common layer and scan buses */ priv->info.ops = &grpci2_ops; priv->info.map_irq = grpci2_map_irq; leon_pci_init(ofdev, &priv->info); return 0; err5: release_resource(&priv->info.io_space); err4: release_resource(&priv->info.mem_space); err3: err = -ENOMEM; iounmap((void __iomem *)priv->pci_io_va); err2: kfree(priv); err1: of_iounmap(&ofdev->resource[0], regs, resource_size(&ofdev->resource[0])); return err; } static const struct of_device_id grpci2_of_match[] = { { .name = "GAISLER_GRPCI2", }, { .name = "01_07c", }, {}, }; static struct platform_driver grpci2_of_driver = { .driver = { .name = "grpci2", .of_match_table = grpci2_of_match, }, .probe = grpci2_of_probe, }; static int __init grpci2_init(void) { return platform_driver_register(&grpci2_of_driver); } subsys_initcall(grpci2_init);
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