[RFC V2 3/6] MIPS: add PCI support for GT64120-based malta
Antony Pavlov
antonynpavlov at gmail.com
Thu Mar 8 14:50:29 EST 2012
Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
---
arch/mips/Kconfig | 22 ++++
arch/mips/mach-malta/Makefile | 1 +
arch/mips/mach-malta/pci.c | 241 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 264 insertions(+), 0 deletions(-)
create mode 100644 arch/mips/mach-malta/pci.c
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 50d5c67..158cdce 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -36,6 +36,7 @@ config MACH_MIPS_MALTA
select SYS_SUPPORTS_32BIT_KERNEL
select SYS_SUPPORTS_BIG_ENDIAN
select HAS_DEBUG_LL
+ select HW_HAS_PCI
config MACH_MIPS_BCM47XX
bool "Broadcom BCM47xx-based boards"
@@ -219,6 +220,27 @@ config CMD_MIPS_CPUINFO
endmenu
+menu "Bus options (PCI)"
+
+config HW_HAS_PCI
+ bool
+
+config PCI
+ bool "Support for PCI controller"
+ depends on HW_HAS_PCI
+ select PCI_DOMAINS
+ help
+ Find out whether you have a PCI motherboard. PCI is the name of a
+ bus system, i.e. the way the CPU talks to the other stuff inside
+ your box. If you have PCI, say Y, otherwise N.
+
+config PCI_DOMAINS
+ bool
+
+source "drivers/pci/Kconfig"
+
+endmenu
+
source common/Kconfig
source commands/Kconfig
source net/Kconfig
diff --git a/arch/mips/mach-malta/Makefile b/arch/mips/mach-malta/Makefile
index f3cc668..0c5a701 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/pci.c b/arch/mips/mach-malta/pci.c
new file mode 100644
index 0000000..5e679a7
--- /dev/null
+++ b/arch/mips/mach-malta/pci.c
@@ -0,0 +1,241 @@
+#include <common.h>
+#include <types.h>
+#include <driver.h>
+#include <init.h>
+#include <mach/hardware.h>
+#include <asm/io.h>
+
+#include <linux/pci.h>
+#include <asm/gt64120.h>
+
+#define GT64120_BASE 0xb4000000
+
+#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;
+}
+
+/* FIXME: it's HACK */
+/* function returns memory address for begin of pci resource */
+static int gt64xxx_res_start(struct pci_bus *bus, resource_size_t res_addr)
+{
+ return res_addr | 0xa0000000;
+}
+
+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,
+};
+
+int pcibios_init()
+{
+ 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));
+ //GT_WRITE(GT_PCI0_CFGDATA_OFS, GT64120_BASE);
+ GT_WRITE(GT_PCI0_CFGDATA_OFS, 0x14000000);
+
+#define PCI0_IO_SPACE_BASE 0x10000000
+#define PCI0_IO_SPACE_SIZE 0x01000000
+#define PCI0_MEM_SPACE_BASE 0x11000000
+#define PCI0_MEM_SPACE_SIZE 0x01000000
+
+#if 1
+ GT_WRITE(GT_PCI0IOLD_OFS, (PCI0_IO_SPACE_BASE >> 21) & 0x7ff);
+ GT_WRITE(GT_PCI0IOHD_OFS, ((PCI0_IO_SPACE_BASE + PCI0_IO_SPACE_SIZE - 1) >> 21) & 0x7f);
+ GT_WRITE(GT_PCI0M0LD_OFS, (PCI0_MEM_SPACE_BASE >> 21) & 0x7ff);
+ GT_WRITE(GT_PCI0M0HD_OFS, ((PCI0_MEM_SPACE_BASE + PCI0_MEM_SPACE_SIZE - 1) >> 21) & 0x7f);
+#endif
+
+ /* Here is linux code. It assumes, that firmware 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);
+#if 0
+ /* Cannot support multiple windows, use the wider. */
+ if (end1 - start1 > end - start) {
+ start = start1;
+ end = end1;
+ map = map1;
+ }
+#endif
+ 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;
+ res_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;
+ res_end <<= GT_PCI_DCRM_SHF;
+ res_end |= (1 << GT_PCI_DCRM_SHF) - 1;
+ gt64120_mem_resource.size = res_end - gt64120_mem_resource.start + 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;
+ res_end <<= GT_PCI_DCRM_SHF;
+ res_end |= (1 << GT_PCI_DCRM_SHF) - 1;
+ gt64120_io_resource.size = res_end - gt64120_io_resource.start + 1;
+
+ register_pci_controller(>64120_controller);
+
+ return 0;
+}
+EXPORT_SYMBOL(pcibios_init);
--
1.7.8.3
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