From 6df26700c0884cb3cce2b9fa4795888f86ca4d8f Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 13 Feb 2007 17:11:04 +0100 Subject: [ARM] 4182/1: iop3xx: fix the ioremap implementation to not remap static ranges Implement a custom ioremap implementation for iop3xx. This saves establishing new mappings. It also cleans up the PCI IO resource to be a physical address rather than a virtual address as Russell pointed out on the original iop13xx port. Signed-off-by: Dan Williams Signed-off-by: Russell King --- arch/arm/plat-iop/Makefile | 2 +- arch/arm/plat-iop/io.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++ arch/arm/plat-iop/pci.c | 6 ++--- 3 files changed, 62 insertions(+), 4 deletions(-) create mode 100644 arch/arm/plat-iop/io.c (limited to 'arch') diff --git a/arch/arm/plat-iop/Makefile b/arch/arm/plat-iop/Makefile index 23da00b1151..ed91463967a 100644 --- a/arch/arm/plat-iop/Makefile +++ b/arch/arm/plat-iop/Makefile @@ -2,7 +2,7 @@ # Makefile for the linux kernel. # -obj-y := gpio.o i2c.o pci.o setup.o time.o +obj-y := gpio.o i2c.o pci.o setup.o time.o io.o obj-m := obj-n := obj- := diff --git a/arch/arm/plat-iop/io.c b/arch/arm/plat-iop/io.c new file mode 100644 index 00000000000..f7eccecf2e4 --- /dev/null +++ b/arch/arm/plat-iop/io.c @@ -0,0 +1,58 @@ +/* + * iop3xx custom ioremap implementation + * Copyright (c) 2006, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + */ +#include +#include +#include +#include + +void * __iomem __iop3xx_ioremap(unsigned long cookie, size_t size, + unsigned long flags) +{ + void __iomem * retval; + + switch (cookie) { + case IOP3XX_PCI_LOWER_IO_PA ... IOP3XX_PCI_UPPER_IO_PA: + retval = (void *) IOP3XX_PCI_IO_PHYS_TO_VIRT(cookie); + break; + case IOP3XX_PERIPHERAL_PHYS_BASE ... IOP3XX_PERIPHERAL_UPPER_PA: + retval = (void *) IOP3XX_PMMR_PHYS_TO_VIRT(cookie); + break; + default: + retval = __ioremap(cookie, size, flags); + } + + return retval; +} +EXPORT_SYMBOL(__iop3xx_ioremap); + +void __iop3xx_iounmap(void __iomem *addr) +{ + extern void __iounmap(volatile void __iomem *addr); + + switch ((u32) addr) { + case IOP3XX_PCI_LOWER_IO_VA ... IOP3XX_PCI_UPPER_IO_VA: + case IOP3XX_PERIPHERAL_VIRT_BASE ... IOP3XX_PERIPHERAL_UPPER_VA: + goto skip; + } + __iounmap(addr); + +skip: + return; +} +EXPORT_SYMBOL(__iop3xx_iounmap); diff --git a/arch/arm/plat-iop/pci.c b/arch/arm/plat-iop/pci.c index e647812654f..b5f6ec35aaf 100644 --- a/arch/arm/plat-iop/pci.c +++ b/arch/arm/plat-iop/pci.c @@ -196,8 +196,8 @@ int iop3xx_pci_setup(int nr, struct pci_sys_data *sys) if (!res) panic("PCI: unable to alloc resources"); - res[0].start = IOP3XX_PCI_LOWER_IO_VA; - res[0].end = IOP3XX_PCI_LOWER_IO_VA + IOP3XX_PCI_IO_WINDOW_SIZE - 1; + res[0].start = IOP3XX_PCI_LOWER_IO_PA; + res[0].end = IOP3XX_PCI_LOWER_IO_PA + IOP3XX_PCI_IO_WINDOW_SIZE - 1; res[0].name = "IOP3XX PCI I/O Space"; res[0].flags = IORESOURCE_IO; request_resource(&ioport_resource, &res[0]); @@ -209,7 +209,7 @@ int iop3xx_pci_setup(int nr, struct pci_sys_data *sys) request_resource(&iomem_resource, &res[1]); sys->mem_offset = IOP3XX_PCI_LOWER_MEM_PA - IOP3XX_PCI_LOWER_MEM_BA; - sys->io_offset = IOP3XX_PCI_LOWER_IO_VA - IOP3XX_PCI_LOWER_IO_BA; + sys->io_offset = IOP3XX_PCI_LOWER_IO_PA - IOP3XX_PCI_LOWER_IO_BA; sys->resource[0] = &res[0]; sys->resource[1] = &res[1]; -- cgit v1.2.3 From dfc544c7216b276c1e9c0c753299692df4068c44 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 13 Feb 2007 17:11:34 +0100 Subject: [ARM] 4183/1: do_undefinstr: read svc undefined instructions with svc privileges do_undefinstr currently does not expect undefined instructions in kernel code, since it always uses get_user() to read the instruction. Dereference the 'pc' pointer directly in the SVC case. Per Nicolas Pitre's note, kernel code is never in thumb mode. Signed-off-by: Dan Williams Signed-off-by: Russell King --- arch/arm/kernel/traps.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 329609b84d3..24095601359 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -282,7 +282,10 @@ asmlinkage void do_undefinstr(struct pt_regs *regs) regs->ARM_pc -= correction; pc = (void __user *)instruction_pointer(regs); - if (thumb_mode(regs)) { + + if (processor_mode(regs) == SVC_MODE) { + instr = *(u32 *) pc; + } else if (thumb_mode(regs)) { get_user(instr, (u16 __user *)pc); } else { get_user(instr, (u32 __user *)pc); -- cgit v1.2.3 From 588ef7693574cfbcb228f48d5478c2b39a9b0c9f Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 13 Feb 2007 17:12:04 +0100 Subject: [ARM] 4184/1: iop: cp6 access handler (undef_hook) Enable svc access to cp6 via an undefined instruction hook. Do not enable access for usr code. This patch also makes iop13xx select PLAT_IOP, this requires a small change to drivers/i2c/busses/i2c-iop3xx.c. Per Lennert Buytenhek's note, the cp6 trap routine is moved to arch/arm/plat-iop Per Nicolas Pitre's note, the cp_wait is skipped since the latency to return to the faulting function is longer than cp_wait. Signed-off-by: Dan Williams Signed-off-by: Russell King --- arch/arm/Kconfig | 2 ++ arch/arm/mach-iop13xx/irq.c | 3 +++ arch/arm/mach-iop32x/irq.c | 2 ++ arch/arm/mach-iop33x/irq.c | 2 ++ arch/arm/plat-iop/Makefile | 30 +++++++++++++++++++++++---- arch/arm/plat-iop/cp6.c | 50 +++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 85 insertions(+), 4 deletions(-) create mode 100644 arch/arm/plat-iop/cp6.c (limited to 'arch') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 6783c2e5512..3f48e35ee61 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -233,6 +233,8 @@ config ARCH_IOP33X config ARCH_IOP13XX bool "IOP13xx-based" + depends on MMU + select PLAT_IOP select PCI help Support for Intel's IOP13XX (XScale) family of processors. diff --git a/arch/arm/mach-iop13xx/irq.c b/arch/arm/mach-iop13xx/irq.c index dbbc07c38b1..162b9321496 100644 --- a/arch/arm/mach-iop13xx/irq.c +++ b/arch/arm/mach-iop13xx/irq.c @@ -250,11 +250,14 @@ static struct irq_chip iop13xx_irqchip4 = { .unmask = iop13xx_irq_unmask3, }; +extern void iop_init_cp6_handler(void); + void __init iop13xx_init_irq(void) { unsigned int i; u32 cp_flags = iop13xx_cp6_save(); + iop_init_cp6_handler(); /* disable all interrupts */ write_intctl_0(0); diff --git a/arch/arm/mach-iop32x/irq.c b/arch/arm/mach-iop32x/irq.c index 3ec1cd5c4f9..8b0ac5590ae 100644 --- a/arch/arm/mach-iop32x/irq.c +++ b/arch/arm/mach-iop32x/irq.c @@ -60,6 +60,8 @@ void __init iop32x_init_irq(void) { int i; + iop_init_cp6_handler(); + intctl_write(0); intstr_write(0); if (machine_is_glantank() || diff --git a/arch/arm/mach-iop33x/irq.c b/arch/arm/mach-iop33x/irq.c index 00b37f32d72..effbe6b782d 100644 --- a/arch/arm/mach-iop33x/irq.c +++ b/arch/arm/mach-iop33x/irq.c @@ -110,6 +110,8 @@ void __init iop33x_init_irq(void) { int i; + iop_init_cp6_handler(); + intctl0_write(0); intctl1_write(0); intstr0_write(0); diff --git a/arch/arm/plat-iop/Makefile b/arch/arm/plat-iop/Makefile index ed91463967a..3250d732a17 100644 --- a/arch/arm/plat-iop/Makefile +++ b/arch/arm/plat-iop/Makefile @@ -2,7 +2,29 @@ # Makefile for the linux kernel. # -obj-y := gpio.o i2c.o pci.o setup.o time.o io.o -obj-m := -obj-n := -obj- := +obj-y := + +# IOP32X +obj-$(CONFIG_ARCH_IOP32X) += gpio.o +obj-$(CONFIG_ARCH_IOP32X) += i2c.o +obj-$(CONFIG_ARCH_IOP32X) += pci.o +obj-$(CONFIG_ARCH_IOP32X) += setup.o +obj-$(CONFIG_ARCH_IOP32X) += time.o +obj-$(CONFIG_ARCH_IOP32X) += io.o +obj-$(CONFIG_ARCH_IOP32X) += cp6.o + +# IOP33X +obj-$(CONFIG_ARCH_IOP33X) += gpio.o +obj-$(CONFIG_ARCH_IOP33X) += i2c.o +obj-$(CONFIG_ARCH_IOP33X) += pci.o +obj-$(CONFIG_ARCH_IOP33X) += setup.o +obj-$(CONFIG_ARCH_IOP33X) += time.o +obj-$(CONFIG_ARCH_IOP33X) += io.o +obj-$(CONFIG_ARCH_IOP33X) += cp6.o + +# IOP13XX +obj-$(CONFIG_ARCH_IOP13XX) += cp6.o + +obj-m := +obj-n := +obj- := diff --git a/arch/arm/plat-iop/cp6.c b/arch/arm/plat-iop/cp6.c new file mode 100644 index 00000000000..9612a87e2a8 --- /dev/null +++ b/arch/arm/plat-iop/cp6.c @@ -0,0 +1,50 @@ +/* + * IOP Coprocessor-6 access handler + * Copyright (c) 2006, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + */ +#include +#include + +static int cp6_trap(struct pt_regs *regs, unsigned int instr) +{ + u32 temp; + + /* enable cp6 access */ + asm volatile ( + "mrc p15, 0, %0, c15, c1, 0\n\t" + "orr %0, %0, #(1 << 6)\n\t" + "mcr p15, 0, %0, c15, c1, 0\n\t" + : "=r"(temp)); + + return 0; +} + +/* permit kernel space cp6 access + * deny user space cp6 access + */ +static struct undef_hook cp6_hook = { + .instr_mask = 0x0f000ff0, + .instr_val = 0x0e000610, + .cpsr_mask = MODE_MASK, + .cpsr_val = SVC_MODE, + .fn = cp6_trap, +}; + +void __init iop_init_cp6_handler(void) +{ + register_undef_hook(&cp6_hook); +} -- cgit v1.2.3