diff options
Diffstat (limited to 'arch/sh/drivers/pci/pci-sh7780.c')
| -rw-r--r-- | arch/sh/drivers/pci/pci-sh7780.c | 407 |
1 files changed, 407 insertions, 0 deletions
diff --git a/arch/sh/drivers/pci/pci-sh7780.c b/arch/sh/drivers/pci/pci-sh7780.c new file mode 100644 index 0000000000..9a624a6ee3 --- /dev/null +++ b/arch/sh/drivers/pci/pci-sh7780.c @@ -0,0 +1,407 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Low-Level PCI Support for the SH7780 + * + * Copyright (C) 2005 - 2010 Paul Mundt + */ +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/timer.h> +#include <linux/irq.h> +#include <linux/errno.h> +#include <linux/delay.h> +#include <linux/log2.h> +#include "pci-sh4.h" +#include <asm/mmu.h> +#include <linux/sizes.h> + +#if defined(CONFIG_CPU_BIG_ENDIAN) +# define PCICR_ENDIANNESS SH4_PCICR_BSWP +#else +# define PCICR_ENDIANNESS 0 +#endif + + +static struct resource sh7785_pci_resources[] = { + { + .name = "PCI IO", + .start = 0x1000, + .end = SZ_4M - 1, + .flags = IORESOURCE_IO, + }, { + .name = "PCI MEM 0", + .start = 0xfd000000, + .end = 0xfd000000 + SZ_16M - 1, + .flags = IORESOURCE_MEM, + }, { + .name = "PCI MEM 1", + .start = 0x10000000, + .end = 0x10000000 + SZ_64M - 1, + .flags = IORESOURCE_MEM, + }, { + /* + * 32-bit only resources must be last. + */ + .name = "PCI MEM 2", + .start = 0xc0000000, + .end = 0xc0000000 + SZ_512M - 1, + .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT, + }, +}; + +static struct pci_channel sh7780_pci_controller = { + .pci_ops = &sh4_pci_ops, + .resources = sh7785_pci_resources, + .nr_resources = ARRAY_SIZE(sh7785_pci_resources), + .io_offset = 0, + .mem_offset = 0, + .io_map_base = 0xfe200000, + .serr_irq = evt2irq(0xa00), + .err_irq = evt2irq(0xaa0), +}; + +struct pci_errors { + unsigned int mask; + const char *str; +} pci_arbiter_errors[] = { + { SH4_PCIAINT_MBKN, "master broken" }, + { SH4_PCIAINT_TBTO, "target bus time out" }, + { SH4_PCIAINT_MBTO, "master bus time out" }, + { SH4_PCIAINT_TABT, "target abort" }, + { SH4_PCIAINT_MABT, "master abort" }, + { SH4_PCIAINT_RDPE, "read data parity error" }, + { SH4_PCIAINT_WDPE, "write data parity error" }, +}, pci_interrupt_errors[] = { + { SH4_PCIINT_MLCK, "master lock error" }, + { SH4_PCIINT_TABT, "target-target abort" }, + { SH4_PCIINT_TRET, "target retry time out" }, + { SH4_PCIINT_MFDE, "master function disable error" }, + { SH4_PCIINT_PRTY, "address parity error" }, + { SH4_PCIINT_SERR, "SERR" }, + { SH4_PCIINT_TWDP, "data parity error for target write" }, + { SH4_PCIINT_TRDP, "PERR detected for target read" }, + { SH4_PCIINT_MTABT, "target abort for master" }, + { SH4_PCIINT_MMABT, "master abort for master" }, + { SH4_PCIINT_MWPD, "master write data parity error" }, + { SH4_PCIINT_MRPD, "master read data parity error" }, +}; + +static irqreturn_t sh7780_pci_err_irq(int irq, void *dev_id) +{ + struct pci_channel *hose = dev_id; + unsigned long addr; + unsigned int status; + unsigned int cmd; + int i; + + addr = __raw_readl(hose->reg_base + SH4_PCIALR); + + /* + * Handle status errors. + */ + status = __raw_readw(hose->reg_base + PCI_STATUS); + if (status & (PCI_STATUS_PARITY | + PCI_STATUS_DETECTED_PARITY | + PCI_STATUS_SIG_TARGET_ABORT | + PCI_STATUS_REC_TARGET_ABORT | + PCI_STATUS_REC_MASTER_ABORT)) { + cmd = pcibios_handle_status_errors(addr, status, hose); + if (likely(cmd)) + __raw_writew(cmd, hose->reg_base + PCI_STATUS); + } + + /* + * Handle arbiter errors. + */ + status = __raw_readl(hose->reg_base + SH4_PCIAINT); + for (i = cmd = 0; i < ARRAY_SIZE(pci_arbiter_errors); i++) { + if (status & pci_arbiter_errors[i].mask) { + printk(KERN_DEBUG "PCI: %s, addr=%08lx\n", + pci_arbiter_errors[i].str, addr); + cmd |= pci_arbiter_errors[i].mask; + } + } + __raw_writel(cmd, hose->reg_base + SH4_PCIAINT); + + /* + * Handle the remaining PCI errors. + */ + status = __raw_readl(hose->reg_base + SH4_PCIINT); + for (i = cmd = 0; i < ARRAY_SIZE(pci_interrupt_errors); i++) { + if (status & pci_interrupt_errors[i].mask) { + printk(KERN_DEBUG "PCI: %s, addr=%08lx\n", + pci_interrupt_errors[i].str, addr); + cmd |= pci_interrupt_errors[i].mask; + } + } + __raw_writel(cmd, hose->reg_base + SH4_PCIINT); + + return IRQ_HANDLED; +} + +static irqreturn_t sh7780_pci_serr_irq(int irq, void *dev_id) +{ + struct pci_channel *hose = dev_id; + + printk(KERN_DEBUG "PCI: system error received: "); + pcibios_report_status(PCI_STATUS_SIG_SYSTEM_ERROR, 1); + pr_cont("\n"); + + /* Deassert SERR */ + __raw_writel(SH4_PCIINTM_SDIM, hose->reg_base + SH4_PCIINTM); + + /* Back off the IRQ for awhile */ + disable_irq_nosync(irq); + hose->serr_timer.expires = jiffies + HZ; + add_timer(&hose->serr_timer); + + return IRQ_HANDLED; +} + +static int __init sh7780_pci_setup_irqs(struct pci_channel *hose) +{ + int ret; + + /* Clear out PCI arbiter IRQs */ + __raw_writel(0, hose->reg_base + SH4_PCIAINT); + + /* Clear all error conditions */ + __raw_writew(PCI_STATUS_DETECTED_PARITY | \ + PCI_STATUS_SIG_SYSTEM_ERROR | \ + PCI_STATUS_REC_MASTER_ABORT | \ + PCI_STATUS_REC_TARGET_ABORT | \ + PCI_STATUS_SIG_TARGET_ABORT | \ + PCI_STATUS_PARITY, hose->reg_base + PCI_STATUS); + + ret = request_irq(hose->serr_irq, sh7780_pci_serr_irq, 0, + "PCI SERR interrupt", hose); + if (unlikely(ret)) { + pr_err("PCI: Failed hooking SERR IRQ\n"); + return ret; + } + + /* + * The PCI ERR IRQ needs to be IRQF_SHARED since all of the power + * down IRQ vectors are routed through the ERR IRQ vector. We + * only request_irq() once as there is only a single masking + * source for multiple events. + */ + ret = request_irq(hose->err_irq, sh7780_pci_err_irq, IRQF_SHARED, + "PCI ERR interrupt", hose); + if (unlikely(ret)) { + free_irq(hose->serr_irq, hose); + return ret; + } + + /* Unmask all of the arbiter IRQs. */ + __raw_writel(SH4_PCIAINT_MBKN | SH4_PCIAINT_TBTO | SH4_PCIAINT_MBTO | \ + SH4_PCIAINT_TABT | SH4_PCIAINT_MABT | SH4_PCIAINT_RDPE | \ + SH4_PCIAINT_WDPE, hose->reg_base + SH4_PCIAINTM); + + /* Unmask all of the PCI IRQs */ + __raw_writel(SH4_PCIINTM_TTADIM | SH4_PCIINTM_TMTOIM | \ + SH4_PCIINTM_MDEIM | SH4_PCIINTM_APEDIM | \ + SH4_PCIINTM_SDIM | SH4_PCIINTM_DPEITWM | \ + SH4_PCIINTM_PEDITRM | SH4_PCIINTM_TADIMM | \ + SH4_PCIINTM_MADIMM | SH4_PCIINTM_MWPDIM | \ + SH4_PCIINTM_MRDPEIM, hose->reg_base + SH4_PCIINTM); + + return ret; +} + +static inline void __init sh7780_pci_teardown_irqs(struct pci_channel *hose) +{ + free_irq(hose->err_irq, hose); + free_irq(hose->serr_irq, hose); +} + +static void __init sh7780_pci66_init(struct pci_channel *hose) +{ + unsigned int tmp; + + if (!pci_is_66mhz_capable(hose, 0, 0)) + return; + + /* Enable register access */ + tmp = __raw_readl(hose->reg_base + SH4_PCICR); + tmp |= SH4_PCICR_PREFIX; + __raw_writel(tmp, hose->reg_base + SH4_PCICR); + + /* Enable 66MHz operation */ + tmp = __raw_readw(hose->reg_base + PCI_STATUS); + tmp |= PCI_STATUS_66MHZ; + __raw_writew(tmp, hose->reg_base + PCI_STATUS); + + /* Done */ + tmp = __raw_readl(hose->reg_base + SH4_PCICR); + tmp |= SH4_PCICR_PREFIX | SH4_PCICR_CFIN; + __raw_writel(tmp, hose->reg_base + SH4_PCICR); +} + +static int __init sh7780_pci_init(void) +{ + struct pci_channel *chan = &sh7780_pci_controller; + phys_addr_t memphys; + size_t memsize; + unsigned int id; + const char *type; + int ret, i; + + pr_notice("PCI: Starting initialization.\n"); + + chan->reg_base = 0xfe040000; + + /* Enable CPU access to the PCIC registers. */ + __raw_writel(PCIECR_ENBL, PCIECR); + + /* Reset */ + __raw_writel(SH4_PCICR_PREFIX | SH4_PCICR_PRST | PCICR_ENDIANNESS, + chan->reg_base + SH4_PCICR); + + /* + * Wait for it to come back up. The spec says to allow for up to + * 1 second after toggling the reset pin, but in practice 100ms + * is more than enough. + */ + mdelay(100); + + id = __raw_readw(chan->reg_base + PCI_VENDOR_ID); + if (id != PCI_VENDOR_ID_RENESAS) { + pr_err("PCI: Unknown vendor ID 0x%04x.\n", id); + return -ENODEV; + } + + id = __raw_readw(chan->reg_base + PCI_DEVICE_ID); + type = (id == PCI_DEVICE_ID_RENESAS_SH7763) ? "SH7763" : + (id == PCI_DEVICE_ID_RENESAS_SH7780) ? "SH7780" : + (id == PCI_DEVICE_ID_RENESAS_SH7781) ? "SH7781" : + (id == PCI_DEVICE_ID_RENESAS_SH7785) ? "SH7785" : + NULL; + if (unlikely(!type)) { + pr_err("PCI: Found an unsupported Renesas host controller, device id 0x%04x.\n", + id); + return -EINVAL; + } + + pr_notice("PCI: Found a Renesas %s host controller, revision %d.\n", + type, __raw_readb(chan->reg_base + PCI_REVISION_ID)); + + /* + * Now throw it in to register initialization mode and + * start the real work. + */ + __raw_writel(SH4_PCICR_PREFIX | PCICR_ENDIANNESS, + chan->reg_base + SH4_PCICR); + + memphys = __pa(memory_start); + memsize = roundup_pow_of_two(memory_end - memory_start); + + /* + * If there's more than 512MB of memory, we need to roll over to + * LAR1/LSR1. + */ + if (memsize > SZ_512M) { + __raw_writel(memphys + SZ_512M, chan->reg_base + SH4_PCILAR1); + __raw_writel((((memsize - SZ_512M) - SZ_1M) & 0x1ff00000) | 1, + chan->reg_base + SH4_PCILSR1); + memsize = SZ_512M; + } else { + /* + * Otherwise just zero it out and disable it. + */ + __raw_writel(0, chan->reg_base + SH4_PCILAR1); + __raw_writel(0, chan->reg_base + SH4_PCILSR1); + } + + /* + * LAR0/LSR0 covers up to the first 512MB, which is enough to + * cover all of lowmem on most platforms. + */ + __raw_writel(memphys, chan->reg_base + SH4_PCILAR0); + __raw_writel(((memsize - SZ_1M) & 0x1ff00000) | 1, + chan->reg_base + SH4_PCILSR0); + + /* + * Hook up the ERR and SERR IRQs. + */ + ret = sh7780_pci_setup_irqs(chan); + if (unlikely(ret)) + return ret; + + /* + * Disable the cache snoop controller for non-coherent DMA. + */ + __raw_writel(0, chan->reg_base + SH7780_PCICSCR0); + __raw_writel(0, chan->reg_base + SH7780_PCICSAR0); + __raw_writel(0, chan->reg_base + SH7780_PCICSCR1); + __raw_writel(0, chan->reg_base + SH7780_PCICSAR1); + + /* + * Setup the memory BARs + */ + for (i = 1; i < chan->nr_resources; i++) { + struct resource *res = chan->resources + i; + resource_size_t size; + + if (unlikely(res->flags & IORESOURCE_IO)) + continue; + + /* + * Make sure we're in the right physical addressing mode + * for dealing with the resource. + */ + if ((res->flags & IORESOURCE_MEM_32BIT) && __in_29bit_mode()) { + chan->nr_resources--; + continue; + } + + size = resource_size(res); + + /* + * The MBMR mask is calculated in units of 256kB, which + * keeps things pretty simple. + */ + __raw_writel(((roundup_pow_of_two(size) / SZ_256K) - 1) << 18, + chan->reg_base + SH7780_PCIMBMR(i - 1)); + __raw_writel(res->start, chan->reg_base + SH7780_PCIMBR(i - 1)); + } + + /* + * And I/O. + */ + __raw_writel(0, chan->reg_base + PCI_BASE_ADDRESS_0); + __raw_writel(0, chan->reg_base + SH7780_PCIIOBR); + __raw_writel(0, chan->reg_base + SH7780_PCIIOBMR); + + __raw_writew(PCI_COMMAND_SERR | PCI_COMMAND_WAIT | \ + PCI_COMMAND_PARITY | PCI_COMMAND_MASTER | \ + PCI_COMMAND_MEMORY, chan->reg_base + PCI_COMMAND); + + /* + * Initialization mode complete, release the control register and + * enable round robin mode to stop device overruns/starvation. + */ + __raw_writel(SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_FTO | + PCICR_ENDIANNESS, + chan->reg_base + SH4_PCICR); + + ret = register_pci_controller(chan); + if (unlikely(ret)) + goto err; + + sh7780_pci66_init(chan); + + pr_notice("PCI: Running at %dMHz.\n", + (__raw_readw(chan->reg_base + PCI_STATUS) & PCI_STATUS_66MHZ) + ? 66 : 33); + + return 0; + +err: + sh7780_pci_teardown_irqs(chan); + return ret; +} +arch_initcall(sh7780_pci_init); |