[PATCH 2/4] m68k: add PCI bus support for the ColdFire M54xx SoC family

gerg
2012-06-29T05:17:46Z

From: Greg Ungerer <gerg@uclinux.org>

The ColdFire M54xx SoC family have a traditional PCI bus interface.
Add the core support code to access and use this bus on these parts.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
---
arch/m68k/include/asm/m54xxpci.h | 138 +++++++++++++++
arch/m68k/include/asm/m54xxsim.h | 3 +
arch/m68k/platform/coldfire/Makefile | 2 +
arch/m68k/platform/coldfire/pci.c | 314 ++++++++++++++++++++++++++++++++++
4 files changed, 457 insertions(+), 0 deletions(-)
create mode 100644 arch/m68k/include/asm/m54xxpci.h
create mode 100644 arch/m68k/platform/coldfire/pci.c

diff --git a/arch/m68k/include/asm/m54xxpci.h b/arch/m68k/include/asm/m54xxpci.h
new file mode 100644
index 0000000..6fbf54f
--- /dev/null
+++ b/arch/m68k/include/asm/m54xxpci.h
@@ -0,0 +1,138 @@
+/****************************************************************************/
+
+/*
+ * m54xxpci.h -- ColdFire 547x and 548x PCI bus support
+ *
+ * (C) Copyright 2011, Greg Ungerer <gerg@uclinux.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+/****************************************************************************/
+#ifndef M54XXPCI_H
+#define M54XXPCI_H
+/****************************************************************************/
+
+/*
+ * The core set of PCI support registers are mapped into the MBAR region.
+ */
+#define PCIIDR (CONFIG_MBAR + 0xb00) /* PCI device/vendor ID */
+#define PCISCR (CONFIG_MBAR + 0xb04) /* PCI status/command */
+#define PCICCRIR (CONFIG_MBAR + 0xb08) /* PCI class/revision */
+#define PCICR1 (CONFIG_MBAR + 0xb0c) /* PCI configuration 1 */
+#define PCIBAR0 (CONFIG_MBAR + 0xb10) /* PCI base address 0 */
+#define PCIBAR1 (CONFIG_MBAR + 0xb14) /* PCI base address 1 */
+#define PCICCPR (CONFIG_MBAR + 0xb28) /* PCI cardbus CIS pointer */
+#define PCISID (CONFIG_MBAR + 0xb2c) /* PCI subsystem IDs */
+#define PCIERBAR (CONFIG_MBAR + 0xb30) /* PCI expansion ROM */
+#define PCICPR (CONFIG_MBAR + 0xb34) /* PCI capabilities pointer */
+#define PCICR2 (CONFIG_MBAR + 0xb3c) /* PCI configuration 2 */
+
+#define PCIGSCR (CONFIG_MBAR + 0xb60) /* Global status/control */
+#define PCITBATR0 (CONFIG_MBAR + 0xb64) /* Target base translation 0 */
+#define PCITBATR1 (CONFIG_MBAR + 0xb68) /* Target base translation 1 */
+#define PCITCR (CONFIG_MBAR + 0xb6c) /* Target control */
+#define PCIIW0BTAR (CONFIG_MBAR + 0xb70) /* Initiator window 0 */
+#define PCIIW1BTAR (CONFIG_MBAR + 0xb74) /* Initiator window 1 */
+#define PCIIW2BTAR (CONFIG_MBAR + 0xb78) /* Initiator window 2 */
+#define PCIIWCR (CONFIG_MBAR + 0xb80) /* Initiator window config */
+#define PCIICR (CONFIG_MBAR + 0xb84) /* Initiator control */
+#define PCIISR (CONFIG_MBAR + 0xb88) /* Initiator status */
+#define PCICAR (CONFIG_MBAR + 0xbf8) /* Configuration address */
+
+#define PCITPSR (CONFIG_MBAR + 0x8400) /* TX packet size */
+#define PCITSAR (CONFIG_MBAR + 0x8404) /* TX start address */
+#define PCITTCR (CONFIG_MBAR + 0x8408) /* TX transaction control */
+#define PCITER (CONFIG_MBAR + 0x840c) /* TX enables */
+#define PCITNAR (CONFIG_MBAR + 0x8410) /* TX next address */
+#define PCITLWR (CONFIG_MBAR + 0x8414) /* TX last word */
+#define PCITDCR (CONFIG_MBAR + 0x8418) /* TX done counts */
+#define PCITSR (CONFIG_MBAR + 0x841c) /* TX status */
+#define PCITFDR (CONFIG_MBAR + 0x8440) /* TX FIFO data */
+#define PCITFSR (CONFIG_MBAR + 0x8444) /* TX FIFO status */
+#define PCITFCR (CONFIG_MBAR + 0x8448) /* TX FIFO control */
+#define PCITFAR (CONFIG_MBAR + 0x844c) /* TX FIFO alarm */
+#define PCITFRPR (CONFIG_MBAR + 0x8450) /* TX FIFO read pointer */
+#define PCITFWPR (CONFIG_MBAR + 0x8454) /* TX FIFO write pointer */
+
+#define PCIRPSR (CONFIG_MBAR + 0x8480) /* RX packet size */
+#define PCIRSAR (CONFIG_MBAR + 0x8484) /* RX start address */
+#define PCIRTCR (CONFIG_MBAR + 0x8488) /* RX transaction control */
+#define PCIRER (CONFIG_MBAR + 0x848c) /* RX enables */
+#define PCIRNAR (CONFIG_MBAR + 0x8490) /* RX next address */
+#define PCIRDCR (CONFIG_MBAR + 0x8498) /* RX done counts */
+#define PCIRSR (CONFIG_MBAR + 0x849c) /* RX status */
+#define PCIRFDR (CONFIG_MBAR + 0x84c0) /* RX FIFO data */
+#define PCIRFSR (CONFIG_MBAR + 0x84c4) /* RX FIFO status */
+#define PCIRFCR (CONFIG_MBAR + 0x84c8) /* RX FIFO control */
+#define PCIRFAR (CONFIG_MBAR + 0x84cc) /* RX FIFO alarm */
+#define PCIRFRPR (CONFIG_MBAR + 0x84d0) /* RX FIFO read pointer */
+#define PCIRFWPR (CONFIG_MBAR + 0x84d4) /* RX FIFO write pointer */
+
+#define PACR (CONFIG_MBAR + 0xc00) /* PCI arbiter control */
+#define PASR (COFNIG_MBAR + 0xc04) /* PCI arbiter status */
+
+/*
+ * Definitions for the Global status and control register.
+ */
+#define PCIGSCR_PE 0x20000000 /* Parity error detected */
+#define PCIGSCR_SE 0x10000000 /* System error detected */
+#define PCIGSCR_XCLKBIN 0x07000000 /* XLB2CLKIN mask */
+#define PCIGSCR_PEE 0x00002000 /* Parity error intr enable */
+#define PCIGSCR_SEE 0x00001000 /* System error intr enable */
+#define PCIGSCR_RESET 0x00000001 /* Reset bit */
+
+/*
+ * Bit definitions for the PCICAR configuration address register.
+ */
+#define PCICAR_E 0x80000000 /* Enable config space */
+#define PCICAR_BUSN 16 /* Move bus bits */
+#define PCICAR_DEVFNN 8 /* Move devfn bits */
+#define PCICAR_DWORDN 0 /* Move dword bits */
+
+/*
+ * The initiator windows hold the memory and IO mapping information.
+ * This macro creates the register values from the desired addresses.
+ */
+#define WXBTAR(hostaddr, pciaddr, size) \
+ (((hostaddr) & 0xff000000) | \
+ ((((size) - 1) & 0xff000000) >> 8) | \
+ (((pciaddr) & 0xff000000) >> 16))
+
+#define PCIIWCR_W0_MEM 0x00000000 /* Window 0 is memory */
+#define PCIIWCR_W0_IO 0x08000000 /* Window 0 is IO */
+#define PCIIWCR_W0_MRD 0x00000000 /* Window 0 memory read */
+#define PCIIWCR_W0_MRDL 0x02000000 /* Window 0 memory read line */
+#define PCIIWCR_W0_MRDM 0x04000000 /* Window 0 memory read mult */
+#define PCIIWCR_W0_E 0x01000000 /* Window 0 enable */
+
+#define PCIIWCR_W1_MEM 0x00000000 /* Window 0 is memory */
+#define PCIIWCR_W1_IO 0x00080000 /* Window 0 is IO */
+#define PCIIWCR_W1_MRD 0x00000000 /* Window 0 memory read */
+#define PCIIWCR_W1_MRDL 0x00020000 /* Window 0 memory read line */
+#define PCIIWCR_W1_MRDM 0x00040000 /* Window 0 memory read mult */
+#define PCIIWCR_W1_E 0x00010000 /* Window 0 enable */
+
+/*
+ * Bit definitions for the PCIBATR registers.
+ */
+#define PCITBATR0_E 0x00000001 /* Enable window 0 */
+#define PCITBATR1_E 0x00000001 /* Enable window 1 */
+
+/*
+ * PCI arbiter support definitions and macros.
+ */
+#define PACR_INTMPRI 0x00000001
+#define PACR_EXTMPRI(x) (((x) & 0x1f) << 1)
+#define PACR_INTMINTE 0x00010000
+#define PACR_EXTMINTE(x) (((x) & 0x1f) << 17)
+#define PACR_PKMD 0x40000000
+#define PACR_DS 0x80000000
+
+#define PCICR1_CL(x) ((x) & 0xf) /* Cacheline size field */
+#define PCICR1_LT(x) (((x) & 0xff) << 8) /* Latency timer field */
+
+/****************************************************************************/
+#endif /* M54XXPCI_H */
diff --git a/arch/m68k/include/asm/m54xxsim.h b/arch/m68k/include/asm/m54xxsim.h
index ae56b88..d3c5e0d 100644
--- a/arch/m68k/include/asm/m54xxsim.h
+++ b/arch/m68k/include/asm/m54xxsim.h
@@ -81,4 +81,7 @@
#define MCF_PAR_PSC_RTS_RTS (0x30)
#define MCF_PAR_PSC_CANRX (0x40)

+#define MCF_PAR_PCIBG (CONFIG_MBAR + 0xa48) /* PCI bus grant */
+#define MCF_PAR_PCIBR (CONFIG_MBAR + 0xa4a) /* PCI */
+
#endif /* m54xxsim_h */
diff --git a/arch/m68k/platform/coldfire/Makefile b/arch/m68k/platform/coldfire/Makefile
index 76d389d..8d72a38 100644
--- a/arch/m68k/platform/coldfire/Makefile
+++ b/arch/m68k/platform/coldfire/Makefile
@@ -32,5 +32,7 @@ obj-$(CONFIG_NETtel) += nettel.o
obj-$(CONFIG_CLEOPATRA) += nettel.o
obj-$(CONFIG_FIREBEE) += firebee.o

+obj-$(CONFIG_PCI) += pci.o
+
obj-y += pinmux.o gpio.o
extra-y := head.o
diff --git a/arch/m68k/platform/coldfire/pci.c b/arch/m68k/platform/coldfire/pci.c
new file mode 100644
index 0000000..eea4d57
--- /dev/null
+++ b/arch/m68k/platform/coldfire/pci.c
@@ -0,0 +1,314 @@
+/*
+ * pci.c -- PCI bus support for ColdFire processors
+ *
+ * (C) Copyright 2012, Greg Ungerer <gerg@uclinux.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+#include <asm/m54xxpci.h>
+
+/*
+ * Memory and IO mappings. We use a 1:1 mapping for local host memory to
+ * PCI bus memory (no reason not to really). IO space doesn't matter, we
+ * always use access functions for that. The device configuration space is
+ * mapped over the IO map space when we enable it in the PCICAR register.
+ */
+#define PCI_MEM_PA 0xf0000000 /* Host physical address */
+#define PCI_MEM_BA 0xf0000000 /* Bus physical address */
+#define PCI_MEM_SIZE 0x08000000 /* 128 MB */
+#define PCI_MEM_MASK (PCI_MEM_SIZE - 1)
+
+#define PCI_IO_PA 0xf8000000 /* Host physical address */
+#define PCI_IO_BA 0x00000000 /* Bus physical address */
+#define PCI_IO_SIZE 0x00010000 /* 64k */
+#define PCI_IO_MASK (PCI_IO_SIZE - 1)
+
+static struct pci_bus *rootbus;
+static unsigned long iospace;
+
+/*
+ * We need to be carefull probing on bus 0 (directly connected to host
+ * bridge). We should only acccess the well defined possible devices in
+ * use, ignore aliases and the like.
+ */
+static unsigned char mcf_host_slot2sid[32] = {
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 1, 2, 0, 3, 4, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+static unsigned char mcf_host_irq[] = {
+ 0, 69, 69, 71, 71,
+};
+
+/*
+ * Configuration space access functions. Configuration space access is
+ * through the IO mapping window, enabling it via the PCICAR register.
+ */
+static unsigned long mcf_mk_pcicar(int bus, unsigned int devfn, int where)
+{
+ return (bus << PCICAR_BUSN) | (devfn << PCICAR_DEVFNN) | (where & 0xfc);
+}
+
+static int mcf_pci_readconfig(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *value)
+{
+ unsigned long addr;
+
+ *value = 0xffffffff;
+
+ if (bus->number == 0) {
+ if (mcf_host_slot2sid[PCI_SLOT(devfn)] == 0)
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ addr = mcf_mk_pcicar(bus->number, devfn, where);
+ __raw_writel(PCICAR_E | addr, PCICAR);
+ addr = iospace + (where & 0x3);
+
+ switch (size) {
+ case 1:
+ *value = __raw_readb(addr);
+ break;
+ case 2:
+ *value = le16_to_cpu(__raw_readw(addr));
+ break;
+ default:
+ *value = le32_to_cpu(__raw_readl(addr));
+ break;
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int mcf_pci_writeconfig(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 value)
+{
+ unsigned long addr;
+
+ if (bus->number == 0) {
+ if (mcf_host_slot2sid[PCI_SLOT(devfn)] == 0)
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ addr = mcf_mk_pcicar(bus->number, devfn, where);
+ __raw_writel(PCICAR_E | addr, PCICAR);
+ addr = iospace + (where & 0x3);
+
+ switch (size) {
+ case 1:
+ __raw_writeb(value, addr);
+ break;
+ case 2:
+ __raw_writew(cpu_to_le16(value), addr);
+ break;
+ default:
+ __raw_writel(cpu_to_le32(value), addr);
+ break;
+ }
+
+ __raw_writel(0, PCICAR);
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops mcf_pci_ops = {
+ .read = mcf_pci_readconfig,
+ .write = mcf_pci_writeconfig,
+};
+
+/*
+ * IO address space access functions. Pretty strait forward, these are
+ * directly mapped in to the IO mapping window. And that is mapped into
+ * virtual address space.
+ */
+u8 mcf_pci_inb(u32 addr)
+{
+ return __raw_readb(iospace + (addr & PCI_IO_MASK));
+}
+EXPORT_SYMBOL(mcf_pci_inb);
+
+u16 mcf_pci_inw(u32 addr)
+{
+ return le16_to_cpu(__raw_readw(iospace + (addr & PCI_IO_MASK)));
+}
+EXPORT_SYMBOL(mcf_pci_inw);
+
+u32 mcf_pci_inl(u32 addr)
+{
+ return le32_to_cpu(__raw_readl(iospace + (addr & PCI_IO_MASK)));
+}
+EXPORT_SYMBOL(mcf_pci_inl);
+
+void mcf_pci_insb(u32 addr, u8 *buf, u32 len)
+{
+ for (; len; len--)
+ *buf++ = mcf_pci_inb(addr);
+}
+EXPORT_SYMBOL(mcf_pci_insb);
+
+void mcf_pci_insw(u32 addr, u16 *buf, u32 len)
+{
+ for (; len; len--)
+ *buf++ = mcf_pci_inw(addr);
+}
+EXPORT_SYMBOL(mcf_pci_insw);
+
+void mcf_pci_insl(u32 addr, u32 *buf, u32 len)
+{
+ for (; len; len--)
+ *buf++ = mcf_pci_inl(addr);
+}
+EXPORT_SYMBOL(mcf_pci_insl);
+
+void mcf_pci_outb(u8 v, u32 addr)
+{
+ __raw_writeb(v, iospace + (addr & PCI_IO_MASK));
+}
+EXPORT_SYMBOL(mcf_pci_outb);
+
+void mcf_pci_outw(u16 v, u32 addr)
+{
+ __raw_writew(cpu_to_le16(v), iospace + (addr & PCI_IO_MASK));
+}
+EXPORT_SYMBOL(mcf_pci_outw);
+
+void mcf_pci_outl(u32 v, u32 addr)
+{
+ __raw_writel(cpu_to_le32(v), iospace + (addr & PCI_IO_MASK));
+}
+EXPORT_SYMBOL(mcf_pci_outl);
+
+void mcf_pci_outsb(u32 addr, const u8 *buf, u32 len)
+{
+ for (; len; len--)
+ mcf_pci_outb(*buf++, addr);
+}
+EXPORT_SYMBOL(mcf_pci_outsb);
+
+void mcf_pci_outsw(u32 addr, const u16 *buf, u32 len)
+{
+ for (; len; len--)
+ mcf_pci_outw(*buf++, addr);
+}
+EXPORT_SYMBOL(mcf_pci_outsw);
+
+void mcf_pci_outsl(u32 addr, const u32 *buf, u32 len)
+{
+ for (; len; len--)
+ mcf_pci_outl(*buf++, addr);
+}
+EXPORT_SYMBOL(mcf_pci_outsl);
+
+/*
+ * Initialize the PCI bus registers, and scan the bus.
+ */
+static struct resource mcf_pci_mem = {
+ .name = "PCI Memory space",
+ .start = PCI_MEM_PA,
+ .end = PCI_MEM_PA + PCI_MEM_SIZE - 1,
+ .flags = IORESOURCE_MEM,
+};
+
+static struct resource mcf_pci_io = {
+ .name = "PCI IO space",
+ .start = 0x400,
+ .end = 0x10000 - 1,
+ .flags = IORESOURCE_IO,
+};
+
+/*
+ * Interrupt mapping and setting.
+ */
+static int mcf_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+ int sid;
+
+ sid = mcf_host_slot2sid[slot];
+ if (sid)
+ return mcf_host_irq[sid];
+ return 0;
+}
+
+static int __init mcf_pci_init(void)
+{
+ pr_info("ColdFire: PCI bus initialization...\n");
+
+ /* Reset the external PCI bus */
+ __raw_writel(PCIGSCR_RESET, PCIGSCR);
+ __raw_writel(0, PCITCR);
+
+ request_resource(&iomem_resource, &mcf_pci_mem);
+ request_resource(&iomem_resource, &mcf_pci_io);
+
+ /* Configure PCI arbiter */
+ __raw_writel(PACR_INTMPRI | PACR_INTMINTE | PACR_EXTMPRI(0x1f) |
+ PACR_EXTMINTE(0x1f), PACR);
+
+ /* Set required multi-function pins for PCI bus use */
+ __raw_writew(0x3ff, MCF_PAR_PCIBG);
+ __raw_writew(0x3ff, MCF_PAR_PCIBR);
+
+ /* Set up config space for local host bus controller */
+ __raw_writel(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+ PCI_COMMAND_INVALIDATE, PCISCR);
+ __raw_writel(PCICR1_LT(32) | PCICR1_CL(8), PCICR1);
+ __raw_writel(0, PCICR2);
+
+ /*
+ * Set up the initiator windows for memory and IO mapping.
+ * These give the CPU bus access onto the PCI bus. One for each of
+ * PCI memory and IO address spaces.
+ */
+ __raw_writel(WXBTAR(PCI_MEM_PA, PCI_MEM_BA, PCI_MEM_SIZE),
+ PCIIW0BTAR);
+ __raw_writel(WXBTAR(PCI_IO_PA, PCI_IO_BA, PCI_IO_SIZE),
+ PCIIW1BTAR);
+ __raw_writel(PCIIWCR_W0_MEM /*| PCIIWCR_W0_MRDL*/ | PCIIWCR_W0_E |
+ PCIIWCR_W1_IO | PCIIWCR_W1_E, PCIIWCR);
+
+ /*
+ * Set up the target windows for access from the PCI bus back to the
+ * CPU bus. All we need is access to system RAM (for mastering).
+ */
+ __raw_writel(CONFIG_RAMBASE, PCIBAR1);
+ __raw_writel(CONFIG_RAMBASE | PCITBATR1_E, PCITBATR1);
+
+ /* Keep a virtual mapping to IO/config space active */
+ iospace = (unsigned long) ioremap(PCI_IO_PA, PCI_IO_SIZE);
+ if (iospace == 0)
+ return -ENODEV;
+ pr_info("Coldfire: PCI IO/config window mapped to 0x%x\n",
+ (u32) iospace);
+
+ /* Turn of PCI reset, and wait for devices to settle */
+ __raw_writel(0, PCIGSCR);
+ schedule_timeout(msecs_to_jiffies(200));
+
+ rootbus = pci_scan_bus(0, &mcf_pci_ops, NULL);
+ rootbus->resource[0] = &mcf_pci_io;
+ rootbus->resource[1] = &mcf_pci_mem;
+
+ pci_fixup_irqs(pci_common_swizzle, mcf_pci_map_irq);
+ pci_bus_size_bridges(rootbus);
+ pci_bus_assign_resources(rootbus);
+ pci_enable_bridges(rootbus);
+ pci_bus_add_devices(rootbus);
+ return 0;
+}
+
+subsys_initcall(mcf_pci_init);
--
1.7.0.4