From 657f7eac3fb0f9d3541c21c3b56283c58eb25743 Mon Sep 17 00:00:00 2001 From: Antony Pavlov Date: Fri, 4 Jul 2014 01:27:05 +0400 Subject: MIPS: add PCI support for GT64120-based Malta board Signed-off-by: Antony Pavlov Signed-off-by: Sascha Hauer --- arch/mips/Kconfig | 1 + arch/mips/include/asm/gt64120.h | 53 +++++ arch/mips/mach-malta/Makefile | 1 + arch/mips/mach-malta/include/mach/mach-gt64120.h | 2 + arch/mips/mach-malta/pci.c | 236 +++++++++++++++++++++++ 5 files changed, 293 insertions(+) create mode 100644 arch/mips/mach-malta/pci.c (limited to 'arch/mips') diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index d4e9e1cde0..bc68c679d5 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -45,6 +45,7 @@ config MACH_MIPS_MALTA select SYS_SUPPORTS_BIG_ENDIAN select HAS_DEBUG_LL select GPIOLIB + select HW_HAS_PCI config MACH_MIPS_AR231X bool "Atheros ar231x-based boards" diff --git a/arch/mips/include/asm/gt64120.h b/arch/mips/include/asm/gt64120.h index 6b2ad0f835..7e783c8111 100644 --- a/arch/mips/include/asm/gt64120.h +++ b/arch/mips/include/asm/gt64120.h @@ -18,6 +18,8 @@ #ifndef _ASM_GT64120_H #define _ASM_GT64120_H +#define MSK(n) ((1 << (n)) - 1) + #define GT_DEF_BASE 0x14000000 /* @@ -34,4 +36,55 @@ #define GT_PCI0M1LD_OFS 0x080 #define GT_PCI0M1HD_OFS 0x088 +#define GT_PCI0IOREMAP_OFS 0x0f0 +#define GT_PCI0M0REMAP_OFS 0x0f8 +#define GT_PCI0M1REMAP_OFS 0x100 + +/* Interrupts. */ +#define GT_INTRCAUSE_OFS 0xc18 + +/* PCI Internal. */ +#define GT_PCI0_CMD_OFS 0xc00 +#define GT_PCI0_CFGADDR_OFS 0xcf8 +#define GT_PCI0_CFGDATA_OFS 0xcfc + +#define GT_PCI_DCRM_SHF 21 +#define GT_PCI_LD_SHF 0 +#define GT_PCI_LD_MSK (MSK(15) << GT_PCI_LD_SHF) +#define GT_PCI_HD_SHF 0 +#define GT_PCI_HD_MSK (MSK(7) << GT_PCI_HD_SHF) +#define GT_PCI_REMAP_SHF 0 +#define GT_PCI_REMAP_MSK (MSK(11) << GT_PCI_REMAP_SHF) + +#define GT_INTRCAUSE_MASABORT0_SHF 18 +#define GT_INTRCAUSE_MASABORT0_MSK (MSK(1) << GT_INTRCAUSE_MASABORT0_SHF) +#define GT_INTRCAUSE_MASABORT0_BIT GT_INTRCAUSE_MASABORT0_MSK + +#define GT_INTRCAUSE_TARABORT0_SHF 19 +#define GT_INTRCAUSE_TARABORT0_MSK (MSK(1) << GT_INTRCAUSE_TARABORT0_SHF) +#define GT_INTRCAUSE_TARABORT0_BIT GT_INTRCAUSE_TARABORT0_MSK + +#define GT_PCI0_CFGADDR_REGNUM_SHF 2 +#define GT_PCI0_CFGADDR_REGNUM_MSK (MSK(6) << GT_PCI0_CFGADDR_REGNUM_SHF) +#define GT_PCI0_CFGADDR_FUNCTNUM_SHF 8 +#define GT_PCI0_CFGADDR_FUNCTNUM_MSK (MSK(3) << GT_PCI0_CFGADDR_FUNCTNUM_SHF) +#define GT_PCI0_CFGADDR_DEVNUM_SHF 11 +#define GT_PCI0_CFGADDR_DEVNUM_MSK (MSK(5) << GT_PCI0_CFGADDR_DEVNUM_SHF) +#define GT_PCI0_CFGADDR_BUSNUM_SHF 16 +#define GT_PCI0_CFGADDR_BUSNUM_MSK (MSK(8) << GT_PCI0_CFGADDR_BUSNUM_SHF) +#define GT_PCI0_CFGADDR_CONFIGEN_SHF 31 +#define GT_PCI0_CFGADDR_CONFIGEN_MSK (MSK(1) << GT_PCI0_CFGADDR_CONFIGEN_SHF) +#define GT_PCI0_CFGADDR_CONFIGEN_BIT GT_PCI0_CFGADDR_CONFIGEN_MSK + +/* + * Because of an error/peculiarity in the Galileo chip, we need to swap the + * bytes when running bigendian. We also provide non-swapping versions. + */ +#define __GT_READ(ofs) \ + (*(volatile u32 *)(GT64120_BASE+(ofs))) +#define __GT_WRITE(ofs, data) \ + do { *(volatile u32 *)(GT64120_BASE+(ofs)) = (data); } while (0) +#define GT_READ(ofs) le32_to_cpu(__GT_READ(ofs)) +#define GT_WRITE(ofs, data) __GT_WRITE(ofs, cpu_to_le32(data)) + #endif /* _ASM_GT64120_H */ diff --git a/arch/mips/mach-malta/Makefile b/arch/mips/mach-malta/Makefile index f3cc6684b8..0c5a7018d4 100644 --- a/arch/mips/mach-malta/Makefile +++ b/arch/mips/mach-malta/Makefile @@ -1 +1,2 @@ obj-y += reset.o +obj-$(CONFIG_PCI) += pci.o diff --git a/arch/mips/mach-malta/include/mach/mach-gt64120.h b/arch/mips/mach-malta/include/mach/mach-gt64120.h index ed1e23e9e0..8f20fcf26f 100644 --- a/arch/mips/mach-malta/include/mach/mach-gt64120.h +++ b/arch/mips/mach-malta/include/mach/mach-gt64120.h @@ -10,4 +10,6 @@ #define MIPS_GT_BASE 0x1be00000 +#define GT64120_BASE 0xbbe00000 + #endif /* _ASM_MACH_MIPS_MACH_GT64120_DEP_H */ diff --git a/arch/mips/mach-malta/pci.c b/arch/mips/mach-malta/pci.c new file mode 100644 index 0000000000..90351758e0 --- /dev/null +++ b/arch/mips/mach-malta/pci.c @@ -0,0 +1,236 @@ +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include + +#define PCI_ACCESS_READ 0 +#define PCI_ACCESS_WRITE 1 + +static struct resource gt64120_mem_resource = { + .name = "GT-64120 PCI MEM", + .flags = IORESOURCE_MEM, +}; + +static struct resource gt64120_io_resource = { + .name = "GT-64120 PCI I/O", + .flags = IORESOURCE_IO, +}; + +static int gt64xxx_pci0_pcibios_config_access(unsigned char access_type, + struct pci_bus *bus, unsigned int devfn, int where, u32 *data) +{ + unsigned char busnum = bus->number; + u32 intr; + + if ((busnum == 0) && (devfn >= PCI_DEVFN(31, 0))) + return -1; /* Because of a bug in the galileo (for slot 31). */ + + /* Clear cause register bits */ + GT_WRITE(GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT | + GT_INTRCAUSE_TARABORT0_BIT)); + + /* Setup address */ + GT_WRITE(GT_PCI0_CFGADDR_OFS, + (busnum << GT_PCI0_CFGADDR_BUSNUM_SHF) | + (devfn << GT_PCI0_CFGADDR_FUNCTNUM_SHF) | + ((where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF) | + GT_PCI0_CFGADDR_CONFIGEN_BIT); + + if (access_type == PCI_ACCESS_WRITE) { + if (busnum == 0 && PCI_SLOT(devfn) == 0) { + /* + * The Galileo system controller is acting + * differently than other devices. + */ + GT_WRITE(GT_PCI0_CFGDATA_OFS, *data); + } else + __GT_WRITE(GT_PCI0_CFGDATA_OFS, *data); + } else { + if (busnum == 0 && PCI_SLOT(devfn) == 0) { + /* + * The Galileo system controller is acting + * differently than other devices. + */ + *data = GT_READ(GT_PCI0_CFGDATA_OFS); + } else + *data = __GT_READ(GT_PCI0_CFGDATA_OFS); + } + + /* Check for master or target abort */ + intr = GT_READ(GT_INTRCAUSE_OFS); + + if (intr & (GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)) { + /* Error occurred */ + + /* Clear bits */ + GT_WRITE(GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT | + GT_INTRCAUSE_TARABORT0_BIT)); + + return -1; + } + + return 0; +} + +/* + * We can't address 8 and 16 bit words directly. Instead we have to + * read/write a 32bit word and mask/modify the data we actually want. + */ +static int gt64xxx_pci0_pcibios_read(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 *val) +{ + u32 data = 0; + + if (gt64xxx_pci0_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, + where, &data)) + return PCIBIOS_DEVICE_NOT_FOUND; + + if (size == 1) + *val = (data >> ((where & 3) << 3)) & 0xff; + else if (size == 2) + *val = (data >> ((where & 3) << 3)) & 0xffff; + else + *val = data; + + return PCIBIOS_SUCCESSFUL; +} + +static int gt64xxx_pci0_pcibios_write(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 val) +{ + u32 data = 0; + + if (size == 4) + data = val; + else { + if (gt64xxx_pci0_pcibios_config_access(PCI_ACCESS_READ, bus, + devfn, where, &data)) + return PCIBIOS_DEVICE_NOT_FOUND; + + if (size == 1) + data = (data & ~(0xff << ((where & 3) << 3))) | + (val << ((where & 3) << 3)); + else if (size == 2) + data = (data & ~(0xffff << ((where & 3) << 3))) | + (val << ((where & 3) << 3)); + } + + if (gt64xxx_pci0_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, + where, &data)) + return PCIBIOS_DEVICE_NOT_FOUND; + + return PCIBIOS_SUCCESSFUL; +} + +/* function returns memory address for begin of pci resource */ +static int gt64xxx_res_start(struct pci_bus *bus, resource_size_t res_addr) +{ + return KSEG0ADDR(res_addr); +} + +struct pci_ops gt64xxx_pci0_ops = { + .read = gt64xxx_pci0_pcibios_read, + .write = gt64xxx_pci0_pcibios_write, + + .res_start = gt64xxx_res_start, +}; + +static struct pci_controller gt64120_controller = { + .pci_ops = >64xxx_pci0_ops, + .io_resource = >64120_io_resource, + .mem_resource = >64120_mem_resource, +}; + +static int pcibios_init(void) +{ + resource_size_t start, end, map, start1, end1, map1, mask, res_end; + + /* + * Due to a bug in the Galileo system controller, we need + * to setup the PCI BAR for the Galileo internal registers. + * This should be done in the bios/bootprom and will be + * fixed in a later revision of YAMON (the MIPS boards + * boot prom). + */ + GT_WRITE(GT_PCI0_CFGADDR_OFS, + (0 << GT_PCI0_CFGADDR_BUSNUM_SHF) | /* Local bus */ + (0 << GT_PCI0_CFGADDR_DEVNUM_SHF) | /* GT64120 dev */ + (0 << GT_PCI0_CFGADDR_FUNCTNUM_SHF) | /* Function 0*/ + ((0x20/4) << GT_PCI0_CFGADDR_REGNUM_SHF) | /* BAR 4*/ + GT_PCI0_CFGADDR_CONFIGEN_BIT); + + /* Perform the write */ + GT_WRITE(GT_PCI0_CFGDATA_OFS, CPHYSADDR(MIPS_GT_BASE)); + + /* Here is linux code. It assumes, that firmware + (pbl in case of barebox) made the work... */ + + /* Set up resource ranges from the controller's registers. */ + start = GT_READ(GT_PCI0M0LD_OFS); + end = GT_READ(GT_PCI0M0HD_OFS); + map = GT_READ(GT_PCI0M0REMAP_OFS); + end = (end & GT_PCI_HD_MSK) | (start & ~GT_PCI_HD_MSK); + start1 = GT_READ(GT_PCI0M1LD_OFS); + end1 = GT_READ(GT_PCI0M1HD_OFS); + map1 = GT_READ(GT_PCI0M1REMAP_OFS); + end1 = (end1 & GT_PCI_HD_MSK) | (start1 & ~GT_PCI_HD_MSK); + + mask = ~(start ^ end); + + /* We don't support remapping with a discontiguous mask. */ + BUG_ON((start & GT_PCI_HD_MSK) != (map & GT_PCI_HD_MSK) && + mask != ~((mask & -mask) - 1)); + gt64120_mem_resource.start = start; + gt64120_mem_resource.end = end; + gt64120_controller.mem_offset = (start & mask) - (map & mask); + /* Addresses are 36-bit, so do shifts in the destinations. */ + gt64120_mem_resource.start <<= GT_PCI_DCRM_SHF; + gt64120_mem_resource.end <<= GT_PCI_DCRM_SHF; + gt64120_mem_resource.end |= (1 << GT_PCI_DCRM_SHF) - 1; + gt64120_controller.mem_offset <<= GT_PCI_DCRM_SHF; + + start = GT_READ(GT_PCI0IOLD_OFS); + end = GT_READ(GT_PCI0IOHD_OFS); + map = GT_READ(GT_PCI0IOREMAP_OFS); + end = (end & GT_PCI_HD_MSK) | (start & ~GT_PCI_HD_MSK); + mask = ~(start ^ end); + + /* We don't support remapping with a discontiguous mask. */ + BUG_ON((start & GT_PCI_HD_MSK) != (map & GT_PCI_HD_MSK) && + mask != ~((mask & -mask) - 1)); + gt64120_io_resource.start = map & mask; + res_end = (map & mask) | ~mask; + gt64120_controller.io_offset = 0; + /* Addresses are 36-bit, so do shifts in the destinations. */ + gt64120_io_resource.start <<= GT_PCI_DCRM_SHF; + gt64120_io_resource.end <<= GT_PCI_DCRM_SHF; + gt64120_io_resource.end |= (1 << GT_PCI_DCRM_SHF) - 1; + +#ifdef CONFIG_CPU_LITTLE_ENDIAN + GT_WRITE(GT_PCI0_CMD_OFS, GT_PCI0_CMD_MBYTESWAP_BIT | + GT_PCI0_CMD_SBYTESWAP_BIT); +#else + GT_WRITE(GT_PCI0_CMD_OFS, 0); +#endif + + /* Fix up PCI I/O mapping if necessary (for Atlas). */ + start = GT_READ(GT_PCI0IOLD_OFS); + map = GT_READ(GT_PCI0IOREMAP_OFS); + if ((start & map) != 0) { + map &= ~start; + GT_WRITE(GT_PCI0IOREMAP_OFS, map); + } + + register_pci_controller(>64120_controller); + + return 0; +} +postcore_initcall(pcibios_init); -- cgit v1.2.3