diff options
Diffstat (limited to 'arch/arm/mach-omap1/fpga.c')
| -rw-r--r-- | arch/arm/mach-omap1/fpga.c | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/arch/arm/mach-omap1/fpga.c b/arch/arm/mach-omap1/fpga.c deleted file mode 100644 index 4c71a195969f..000000000000 --- a/arch/arm/mach-omap1/fpga.c +++ /dev/null @@ -1,186 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * linux/arch/arm/mach-omap1/fpga.c - * - * Interrupt handler for OMAP-1510 Innovator FPGA - * - * Copyright (C) 2001 RidgeRun, Inc. - * Author: Greg Lonnon <glonnon@ridgerun.com> - * - * Copyright (C) 2002 MontaVista Software, Inc. - * - * Separated FPGA interrupts from innovator1510.c and cleaned up for 2.6 - * Copyright (C) 2004 Nokia Corporation by Tony Lindrgen <tony@atomide.com> - */ - -#include <linux/types.h> -#include <linux/gpio.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/device.h> -#include <linux/errno.h> -#include <linux/io.h> - -#include <asm/irq.h> -#include <asm/mach/irq.h> - -#include "hardware.h" -#include "iomap.h" -#include "common.h" -#include "fpga.h" - -static void fpga_mask_irq(struct irq_data *d) -{ - unsigned int irq = d->irq - OMAP_FPGA_IRQ_BASE; - - if (irq < 8) - __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_LO) - & ~(1 << irq)), OMAP1510_FPGA_IMR_LO); - else if (irq < 16) - __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_HI) - & ~(1 << (irq - 8))), OMAP1510_FPGA_IMR_HI); - else - __raw_writeb((__raw_readb(INNOVATOR_FPGA_IMR2) - & ~(1 << (irq - 16))), INNOVATOR_FPGA_IMR2); -} - - -static inline u32 get_fpga_unmasked_irqs(void) -{ - return - ((__raw_readb(OMAP1510_FPGA_ISR_LO) & - __raw_readb(OMAP1510_FPGA_IMR_LO))) | - ((__raw_readb(OMAP1510_FPGA_ISR_HI) & - __raw_readb(OMAP1510_FPGA_IMR_HI)) << 8) | - ((__raw_readb(INNOVATOR_FPGA_ISR2) & - __raw_readb(INNOVATOR_FPGA_IMR2)) << 16); -} - - -static void fpga_ack_irq(struct irq_data *d) -{ - /* Don't need to explicitly ACK FPGA interrupts */ -} - -static void fpga_unmask_irq(struct irq_data *d) -{ - unsigned int irq = d->irq - OMAP_FPGA_IRQ_BASE; - - if (irq < 8) - __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_LO) | (1 << irq)), - OMAP1510_FPGA_IMR_LO); - else if (irq < 16) - __raw_writeb((__raw_readb(OMAP1510_FPGA_IMR_HI) - | (1 << (irq - 8))), OMAP1510_FPGA_IMR_HI); - else - __raw_writeb((__raw_readb(INNOVATOR_FPGA_IMR2) - | (1 << (irq - 16))), INNOVATOR_FPGA_IMR2); -} - -static void fpga_mask_ack_irq(struct irq_data *d) -{ - fpga_mask_irq(d); - fpga_ack_irq(d); -} - -static void innovator_fpga_IRQ_demux(struct irq_desc *desc) -{ - u32 stat; - int fpga_irq; - - stat = get_fpga_unmasked_irqs(); - - if (!stat) - return; - - for (fpga_irq = OMAP_FPGA_IRQ_BASE; - (fpga_irq < OMAP_FPGA_IRQ_END) && stat; - fpga_irq++, stat >>= 1) { - if (stat & 1) { - generic_handle_irq(fpga_irq); - } - } -} - -static struct irq_chip omap_fpga_irq_ack = { - .name = "FPGA-ack", - .irq_ack = fpga_mask_ack_irq, - .irq_mask = fpga_mask_irq, - .irq_unmask = fpga_unmask_irq, -}; - - -static struct irq_chip omap_fpga_irq = { - .name = "FPGA", - .irq_ack = fpga_ack_irq, - .irq_mask = fpga_mask_irq, - .irq_unmask = fpga_unmask_irq, -}; - -/* - * All of the FPGA interrupt request inputs except for the touchscreen are - * edge-sensitive; the touchscreen is level-sensitive. The edge-sensitive - * interrupts are acknowledged as a side-effect of reading the interrupt - * status register from the FPGA. The edge-sensitive interrupt inputs - * cause a problem with level interrupt requests, such as Ethernet. The - * problem occurs when a level interrupt request is asserted while its - * interrupt input is masked in the FPGA, which results in a missed - * interrupt. - * - * In an attempt to workaround the problem with missed interrupts, the - * mask_ack routine for all of the FPGA interrupts has been changed from - * fpga_mask_ack_irq() to fpga_ack_irq() so that the specific FPGA interrupt - * being serviced is left unmasked. We can do this because the FPGA cascade - * interrupt is run with all interrupts masked. - * - * Limited testing indicates that this workaround appears to be effective - * for the smc9194 Ethernet driver used on the Innovator. It should work - * on other FPGA interrupts as well, but any drivers that explicitly mask - * interrupts at the interrupt controller via disable_irq/enable_irq - * could pose a problem. - */ -void omap1510_fpga_init_irq(void) -{ - int i, res; - - __raw_writeb(0, OMAP1510_FPGA_IMR_LO); - __raw_writeb(0, OMAP1510_FPGA_IMR_HI); - __raw_writeb(0, INNOVATOR_FPGA_IMR2); - - for (i = OMAP_FPGA_IRQ_BASE; i < OMAP_FPGA_IRQ_END; i++) { - - if (i == OMAP1510_INT_FPGA_TS) { - /* - * The touchscreen interrupt is level-sensitive, so - * we'll use the regular mask_ack routine for it. - */ - irq_set_chip(i, &omap_fpga_irq_ack); - } - else { - /* - * All FPGA interrupts except the touchscreen are - * edge-sensitive, so we won't mask them. - */ - irq_set_chip(i, &omap_fpga_irq); - } - - irq_set_handler(i, handle_edge_irq); - irq_clear_status_flags(i, IRQ_NOREQUEST); - } - - /* - * The FPGA interrupt line is connected to GPIO13. Claim this pin for - * the ARM. - * - * NOTE: For general GPIO/MPUIO access and interrupts, please see - * gpio.[ch] - */ - res = gpio_request(13, "FPGA irq"); - if (res) { - pr_err("%s failed to get gpio\n", __func__); - return; - } - gpio_direction_input(13); - irq_set_irq_type(gpio_to_irq(13), IRQ_TYPE_EDGE_RISING); - irq_set_chained_handler(OMAP1510_INT_FPGA, innovator_fpga_IRQ_demux); -} |