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Diffstat (limited to 'arch/arm/plat-mxc/tzic.c')
| -rw-r--r-- | arch/arm/plat-mxc/tzic.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/tzic.c b/arch/arm/plat-mxc/tzic.c new file mode 100644 index 00000000000..afa6709db0b --- /dev/null +++ b/arch/arm/plat-mxc/tzic.c @@ -0,0 +1,172 @@ +/* + * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/io.h> + +#include <asm/mach/irq.h> + +#include <mach/hardware.h> + +/* + ***************************************** + * TZIC Registers * + ***************************************** + */ + +#define TZIC_INTCNTL 0x0000 /* Control register */ +#define TZIC_INTTYPE 0x0004 /* Controller Type register */ +#define TZIC_IMPID 0x0008 /* Distributor Implementer Identification */ +#define TZIC_PRIOMASK 0x000C /* Priority Mask Reg */ +#define TZIC_SYNCCTRL 0x0010 /* Synchronizer Control register */ +#define TZIC_DSMINT 0x0014 /* DSM interrupt Holdoffregister */ +#define TZIC_INTSEC0(i) (0x0080 + ((i) << 2)) /* Interrupt Security Reg 0 */ +#define TZIC_ENSET0(i) (0x0100 + ((i) << 2)) /* Enable Set Reg 0 */ +#define TZIC_ENCLEAR0(i) (0x0180 + ((i) << 2)) /* Enable Clear Reg 0 */ +#define TZIC_SRCSET0 0x0200 /* Source Set Register 0 */ +#define TZIC_SRCCLAR0 0x0280 /* Source Clear Register 0 */ +#define TZIC_PRIORITY0 0x0400 /* Priority Register 0 */ +#define TZIC_PND0 0x0D00 /* Pending Register 0 */ +#define TZIC_HIPND0 0x0D80 /* High Priority Pending Register */ +#define TZIC_WAKEUP0(i) (0x0E00 + ((i) << 2)) /* Wakeup Config Register */ +#define TZIC_SWINT 0x0F00 /* Software Interrupt Rigger Register */ +#define TZIC_ID0 0x0FD0 /* Indentification Register 0 */ + +void __iomem *tzic_base; /* Used as irq controller base in entry-macro.S */ + +/** + * tzic_mask_irq() - Disable interrupt number "irq" in the TZIC + * + * @param irq interrupt source number + */ +static void tzic_mask_irq(unsigned int irq) +{ + int index, off; + + index = irq >> 5; + off = irq & 0x1F; + __raw_writel(1 << off, tzic_base + TZIC_ENCLEAR0(index)); +} + +/** + * tzic_unmask_irq() - Enable interrupt number "irq" in the TZIC + * + * @param irq interrupt source number + */ +static void tzic_unmask_irq(unsigned int irq) +{ + int index, off; + + index = irq >> 5; + off = irq & 0x1F; + __raw_writel(1 << off, tzic_base + TZIC_ENSET0(index)); +} + +static unsigned int wakeup_intr[4]; + +/** + * tzic_set_wake_irq() - Set interrupt number "irq" in the TZIC as a wake-up source. + * + * @param irq interrupt source number + * @param enable enable as wake-up if equal to non-zero + * disble as wake-up if equal to zero + * + * @return This function returns 0 on success. + */ +static int tzic_set_wake_irq(unsigned int irq, unsigned int enable) +{ + unsigned int index, off; + + index = irq >> 5; + off = irq & 0x1F; + + if (index > 3) + return -EINVAL; + + if (enable) + wakeup_intr[index] |= (1 << off); + else + wakeup_intr[index] &= ~(1 << off); + + return 0; +} + +static struct irq_chip mxc_tzic_chip = { + .name = "MXC_TZIC", + .ack = tzic_mask_irq, + .mask = tzic_mask_irq, + .unmask = tzic_unmask_irq, + .set_wake = tzic_set_wake_irq, +}; + +/* + * This function initializes the TZIC hardware and disables all the + * interrupts. It registers the interrupt enable and disable functions + * to the kernel for each interrupt source. + */ +void __init tzic_init_irq(void __iomem *irqbase) +{ + int i; + + tzic_base = irqbase; + /* put the TZIC into the reset value with + * all interrupts disabled + */ + i = __raw_readl(tzic_base + TZIC_INTCNTL); + + __raw_writel(0x80010001, tzic_base + TZIC_INTCNTL); + __raw_writel(0x1f, tzic_base + TZIC_PRIOMASK); + __raw_writel(0x02, tzic_base + TZIC_SYNCCTRL); + + for (i = 0; i < 4; i++) + __raw_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i)); + + /* disable all interrupts */ + for (i = 0; i < 4; i++) + __raw_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i)); + + /* all IRQ no FIQ Warning :: No selection */ + + for (i = 0; i < MXC_INTERNAL_IRQS; i++) { + set_irq_chip(i, &mxc_tzic_chip); + set_irq_handler(i, handle_level_irq); + set_irq_flags(i, IRQF_VALID); + } + + pr_info("TrustZone Interrupt Controller (TZIC) initialized\n"); +} + +/** + * tzic_enable_wake() - enable wakeup interrupt + * + * @param is_idle 1 if called in idle loop (ENSET0 register); + * 0 to be used when called from low power entry + * @return 0 if successful; non-zero otherwise + */ +int tzic_enable_wake(int is_idle) +{ + unsigned int i, v; + + __raw_writel(1, tzic_base + TZIC_DSMINT); + if (unlikely(__raw_readl(tzic_base + TZIC_DSMINT) == 0)) + return -EAGAIN; + + for (i = 0; i < 4; i++) { + v = is_idle ? __raw_readl(TZIC_ENSET0(i)) : wakeup_intr[i]; + __raw_writel(v, TZIC_WAKEUP0(i)); + } + + return 0; +} |