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Diffstat (limited to 'arch/arm/mach-omap1/fpga.c')
-rw-r--r--arch/arm/mach-omap1/fpga.c186
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);
-}