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-rw-r--r--arch/blackfin/mach-common/ints-priority-sc.c577
1 files changed, 577 insertions, 0 deletions
diff --git a/arch/blackfin/mach-common/ints-priority-sc.c b/arch/blackfin/mach-common/ints-priority-sc.c
new file mode 100644
index 000000000000..34b62288ec3c
--- /dev/null
+++ b/arch/blackfin/mach-common/ints-priority-sc.c
@@ -0,0 +1,577 @@
+/*
+ * File: arch/blackfin/mach-common/ints-priority-sc.c
+ * Based on:
+ * Author:
+ *
+ * Created: ?
+ * Description: Set up the interupt priorities
+ *
+ * Modified:
+ * 1996 Roman Zippel
+ * 1999 D. Jeff Dionne <jeff@uclinux.org>
+ * 2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
+ * 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
+ * 2003 Metrowerks/Motorola
+ * 2003 Bas Vermeulen <bas@buyways.nl>
+ * Copyright 2004-2006 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/kernel_stat.h>
+#include <linux/seq_file.h>
+#include <linux/irq.h>
+#ifdef CONFIG_KGDB
+#include <linux/kgdb.h>
+#endif
+#include <asm/traps.h>
+#include <asm/blackfin.h>
+#include <asm/gpio.h>
+#include <asm/irq_handler.h>
+
+#ifdef BF537_FAMILY
+# define BF537_GENERIC_ERROR_INT_DEMUX
+#else
+# undef BF537_GENERIC_ERROR_INT_DEMUX
+#endif
+
+/*
+ * NOTES:
+ * - we have separated the physical Hardware interrupt from the
+ * levels that the LINUX kernel sees (see the description in irq.h)
+ * -
+ */
+
+unsigned long irq_flags = 0;
+
+/* The number of spurious interrupts */
+atomic_t num_spurious;
+
+struct ivgx {
+ /* irq number for request_irq, available in mach-bf533/irq.h */
+ int irqno;
+ /* corresponding bit in the SIC_ISR register */
+ int isrflag;
+} ivg_table[NR_PERI_INTS];
+
+struct ivg_slice {
+ /* position of first irq in ivg_table for given ivg */
+ struct ivgx *ifirst;
+ struct ivgx *istop;
+} ivg7_13[IVG13 - IVG7 + 1];
+
+static void search_IAR(void);
+
+/*
+ * Search SIC_IAR and fill tables with the irqvalues
+ * and their positions in the SIC_ISR register.
+ */
+static void __init search_IAR(void)
+{
+ unsigned ivg, irq_pos = 0;
+ for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {
+ int irqn;
+
+ ivg7_13[ivg].istop = ivg7_13[ivg].ifirst =
+ &ivg_table[irq_pos];
+
+ for (irqn = 0; irqn < NR_PERI_INTS; irqn++) {
+ int iar_shift = (irqn & 7) * 4;
+ if (ivg ==
+ (0xf &
+ bfin_read32((unsigned long *) SIC_IAR0 +
+ (irqn >> 3)) >> iar_shift)) {
+ ivg_table[irq_pos].irqno = IVG7 + irqn;
+ ivg_table[irq_pos].isrflag = 1 << irqn;
+ ivg7_13[ivg].istop++;
+ irq_pos++;
+ }
+ }
+ }
+}
+
+/*
+ * This is for BF533 internal IRQs
+ */
+
+static void ack_noop(unsigned int irq)
+{
+ /* Dummy function. */
+}
+
+static void bfin_core_mask_irq(unsigned int irq)
+{
+ irq_flags &= ~(1 << irq);
+ if (!irqs_disabled())
+ local_irq_enable();
+}
+
+static void bfin_core_unmask_irq(unsigned int irq)
+{
+ irq_flags |= 1 << irq;
+ /*
+ * If interrupts are enabled, IMASK must contain the same value
+ * as irq_flags. Make sure that invariant holds. If interrupts
+ * are currently disabled we need not do anything; one of the
+ * callers will take care of setting IMASK to the proper value
+ * when reenabling interrupts.
+ * local_irq_enable just does "STI irq_flags", so it's exactly
+ * what we need.
+ */
+ if (!irqs_disabled())
+ local_irq_enable();
+ return;
+}
+
+static void bfin_internal_mask_irq(unsigned int irq)
+{
+ bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
+ ~(1 << (irq - (IRQ_CORETMR + 1))));
+ SSYNC();
+}
+
+static void bfin_internal_unmask_irq(unsigned int irq)
+{
+ bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() |
+ (1 << (irq - (IRQ_CORETMR + 1))));
+ SSYNC();
+}
+
+static struct irq_chip bfin_core_irqchip = {
+ .ack = ack_noop,
+ .mask = bfin_core_mask_irq,
+ .unmask = bfin_core_unmask_irq,
+};
+
+static struct irq_chip bfin_internal_irqchip = {
+ .ack = ack_noop,
+ .mask = bfin_internal_mask_irq,
+ .unmask = bfin_internal_unmask_irq,
+};
+
+#ifdef BF537_GENERIC_ERROR_INT_DEMUX
+static int error_int_mask;
+
+static void bfin_generic_error_ack_irq(unsigned int irq)
+{
+
+}
+
+static void bfin_generic_error_mask_irq(unsigned int irq)
+{
+ error_int_mask &= ~(1L << (irq - IRQ_PPI_ERROR));
+
+ if (!error_int_mask) {
+ local_irq_disable();
+ bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
+ ~(1 <<
+ (IRQ_GENERIC_ERROR -
+ (IRQ_CORETMR + 1))));
+ SSYNC();
+ local_irq_enable();
+ }
+}
+
+static void bfin_generic_error_unmask_irq(unsigned int irq)
+{
+ local_irq_disable();
+ bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() | 1 <<
+ (IRQ_GENERIC_ERROR - (IRQ_CORETMR + 1)));
+ SSYNC();
+ local_irq_enable();
+
+ error_int_mask |= 1L << (irq - IRQ_PPI_ERROR);
+}
+
+static struct irq_chip bfin_generic_error_irqchip = {
+ .ack = bfin_generic_error_ack_irq,
+ .mask = bfin_generic_error_mask_irq,
+ .unmask = bfin_generic_error_unmask_irq,
+};
+
+static void bfin_demux_error_irq(unsigned int int_err_irq,
+ struct irq_desc *intb_desc)
+{
+ int irq = 0;
+
+ SSYNC();
+
+#if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
+ if (bfin_read_EMAC_SYSTAT() & EMAC_ERR_MASK)
+ irq = IRQ_MAC_ERROR;
+ else
+#endif
+ if (bfin_read_SPORT0_STAT() & SPORT_ERR_MASK)
+ irq = IRQ_SPORT0_ERROR;
+ else if (bfin_read_SPORT1_STAT() & SPORT_ERR_MASK)
+ irq = IRQ_SPORT1_ERROR;
+ else if (bfin_read_PPI_STATUS() & PPI_ERR_MASK)
+ irq = IRQ_PPI_ERROR;
+ else if (bfin_read_CAN_GIF() & CAN_ERR_MASK)
+ irq = IRQ_CAN_ERROR;
+ else if (bfin_read_SPI_STAT() & SPI_ERR_MASK)
+ irq = IRQ_SPI_ERROR;
+ else if ((bfin_read_UART0_IIR() & UART_ERR_MASK_STAT1) &&
+ (bfin_read_UART0_IIR() & UART_ERR_MASK_STAT0))
+ irq = IRQ_UART0_ERROR;
+ else if ((bfin_read_UART1_IIR() & UART_ERR_MASK_STAT1) &&
+ (bfin_read_UART1_IIR() & UART_ERR_MASK_STAT0))
+ irq = IRQ_UART1_ERROR;
+
+ if (irq) {
+ if (error_int_mask & (1L << (irq - IRQ_PPI_ERROR))) {
+ struct irq_desc *desc = irq_desc + irq;
+ desc->handle_irq(irq, desc);
+ } else {
+
+ switch (irq) {
+ case IRQ_PPI_ERROR:
+ bfin_write_PPI_STATUS(PPI_ERR_MASK);
+ break;
+#if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
+ case IRQ_MAC_ERROR:
+ bfin_write_EMAC_SYSTAT(EMAC_ERR_MASK);
+ break;
+#endif
+ case IRQ_SPORT0_ERROR:
+ bfin_write_SPORT0_STAT(SPORT_ERR_MASK);
+ break;
+
+ case IRQ_SPORT1_ERROR:
+ bfin_write_SPORT1_STAT(SPORT_ERR_MASK);
+ break;
+
+ case IRQ_CAN_ERROR:
+ bfin_write_CAN_GIS(CAN_ERR_MASK);
+ break;
+
+ case IRQ_SPI_ERROR:
+ bfin_write_SPI_STAT(SPI_ERR_MASK);
+ break;
+
+ default:
+ break;
+ }
+
+ pr_debug("IRQ %d:"
+ " MASKED PERIPHERAL ERROR INTERRUPT ASSERTED\n",
+ irq);
+ }
+ } else
+ printk(KERN_ERR
+ "%s : %s : LINE %d :\nIRQ ?: PERIPHERAL ERROR"
+ " INTERRUPT ASSERTED BUT NO SOURCE FOUND\n",
+ __FUNCTION__, __FILE__, __LINE__);
+
+
+}
+#endif /* BF537_GENERIC_ERROR_INT_DEMUX */
+
+#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
+
+static unsigned short gpio_enabled[gpio_bank(MAX_BLACKFIN_GPIOS)];
+static unsigned short gpio_edge_triggered[gpio_bank(MAX_BLACKFIN_GPIOS)];
+
+static void bfin_gpio_ack_irq(unsigned int irq)
+{
+ u16 gpionr = irq - IRQ_PF0;
+
+ if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
+ set_gpio_data(gpionr, 0);
+ SSYNC();
+ }
+}
+
+static void bfin_gpio_mask_ack_irq(unsigned int irq)
+{
+ u16 gpionr = irq - IRQ_PF0;
+
+ if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
+ set_gpio_data(gpionr, 0);
+ SSYNC();
+ }
+
+ set_gpio_maska(gpionr, 0);
+ SSYNC();
+}
+
+static void bfin_gpio_mask_irq(unsigned int irq)
+{
+ set_gpio_maska(irq - IRQ_PF0, 0);
+ SSYNC();
+}
+
+static void bfin_gpio_unmask_irq(unsigned int irq)
+{
+ set_gpio_maska(irq - IRQ_PF0, 1);
+ SSYNC();
+}
+
+static unsigned int bfin_gpio_irq_startup(unsigned int irq)
+{
+ unsigned int ret;
+ u16 gpionr = irq - IRQ_PF0;
+
+ if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
+ ret = gpio_request(gpionr, NULL);
+ if (ret)
+ return ret;
+ }
+
+ gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
+ bfin_gpio_unmask_irq(irq);
+
+ return ret;
+}
+
+static void bfin_gpio_irq_shutdown(unsigned int irq)
+{
+ bfin_gpio_mask_irq(irq);
+ gpio_free(irq - IRQ_PF0);
+ gpio_enabled[gpio_bank(irq - IRQ_PF0)] &= ~gpio_bit(irq - IRQ_PF0);
+}
+
+static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
+{
+
+ unsigned int ret;
+ u16 gpionr = irq - IRQ_PF0;
+
+ if (type == IRQ_TYPE_PROBE) {
+ /* only probe unenabled GPIO interrupt lines */
+ if (gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))
+ return 0;
+ type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
+ }
+
+ if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
+ IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
+ {
+ if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
+ ret = gpio_request(gpionr, NULL);
+ if (ret)
+ return ret;
+ }
+
+ gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
+ } else {
+ gpio_enabled[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
+ return 0;
+ }
+
+ set_gpio_dir(gpionr, 0);
+ set_gpio_inen(gpionr, 1);
+
+ if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
+ gpio_edge_triggered[gpio_bank(gpionr)] |= gpio_bit(gpionr);
+ set_gpio_edge(gpionr, 1);
+ } else {
+ set_gpio_edge(gpionr, 0);
+ gpio_edge_triggered[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
+ }
+
+ if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+ == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+ set_gpio_both(gpionr, 1);
+ else
+ set_gpio_both(gpionr, 0);
+
+ if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
+ set_gpio_polar(gpionr, 1); /* low or falling edge denoted by one */
+ else
+ set_gpio_polar(gpionr, 0); /* high or rising edge denoted by zero */
+
+ SSYNC();
+
+ if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+ set_irq_handler(irq, handle_edge_irq);
+ else
+ set_irq_handler(irq, handle_level_irq);
+
+ return 0;
+}
+
+
+static struct irq_chip bfin_gpio_irqchip = {
+ .ack = bfin_gpio_ack_irq,
+ .mask = bfin_gpio_mask_irq,
+ .mask_ack = bfin_gpio_mask_ack_irq,
+ .unmask = bfin_gpio_unmask_irq,
+ .set_type = bfin_gpio_irq_type,
+ .startup = bfin_gpio_irq_startup,
+ .shutdown = bfin_gpio_irq_shutdown
+};
+
+static void bfin_demux_gpio_irq(unsigned int intb_irq,
+ struct irq_desc *intb_desc)
+{
+ u16 i;
+
+ for (i = 0; i < MAX_BLACKFIN_GPIOS; i+=16) {
+ int irq = IRQ_PF0 + i;
+ int flag_d = get_gpiop_data(i);
+ int mask =
+ flag_d & (gpio_enabled[gpio_bank(i)] &
+ get_gpiop_maska(i));
+
+ while (mask) {
+ if (mask & 1) {
+ struct irq_desc *desc = irq_desc + irq;
+ desc->handle_irq(irq, desc);
+ }
+ irq++;
+ mask >>= 1;
+ }
+ }
+}
+
+#endif /* CONFIG_IRQCHIP_DEMUX_GPIO */
+
+/*
+ * This function should be called during kernel startup to initialize
+ * the BFin IRQ handling routines.
+ */
+int __init init_arch_irq(void)
+{
+ int irq;
+ unsigned long ilat = 0;
+ /* Disable all the peripheral intrs - page 4-29 HW Ref manual */
+ bfin_write_SIC_IMASK(SIC_UNMASK_ALL);
+ SSYNC();
+
+ local_irq_disable();
+
+#ifndef CONFIG_KGDB
+ bfin_write_EVT0(evt_emulation);
+#endif
+ bfin_write_EVT2(evt_evt2);
+ bfin_write_EVT3(trap);
+ bfin_write_EVT5(evt_ivhw);
+ bfin_write_EVT6(evt_timer);
+ bfin_write_EVT7(evt_evt7);
+ bfin_write_EVT8(evt_evt8);
+ bfin_write_EVT9(evt_evt9);
+ bfin_write_EVT10(evt_evt10);
+ bfin_write_EVT11(evt_evt11);
+ bfin_write_EVT12(evt_evt12);
+ bfin_write_EVT13(evt_evt13);
+ bfin_write_EVT14(evt14_softirq);
+ bfin_write_EVT15(evt_system_call);
+ CSYNC();
+
+ for (irq = 0; irq < SYS_IRQS; irq++) {
+ if (irq <= IRQ_CORETMR)
+ set_irq_chip(irq, &bfin_core_irqchip);
+ else
+ set_irq_chip(irq, &bfin_internal_irqchip);
+#ifdef BF537_GENERIC_ERROR_INT_DEMUX
+ if (irq != IRQ_GENERIC_ERROR) {
+#endif
+
+#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
+ if ((irq != IRQ_PROG_INTA) /*PORT F & G MASK_A Interrupt*/
+# if defined(BF537_FAMILY) && !(defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
+ && (irq != IRQ_MAC_RX) /*PORT H MASK_A Interrupt*/
+# endif
+ ) {
+#endif
+ set_irq_handler(irq, handle_simple_irq);
+#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
+ } else {
+ set_irq_chained_handler(irq,
+ bfin_demux_gpio_irq);
+ }
+#endif
+
+#ifdef BF537_GENERIC_ERROR_INT_DEMUX
+ } else {
+ set_irq_handler(irq, bfin_demux_error_irq);
+ }
+#endif
+ }
+#ifdef BF537_GENERIC_ERROR_INT_DEMUX
+ for (irq = IRQ_PPI_ERROR; irq <= IRQ_UART1_ERROR; irq++) {
+ set_irq_chip(irq, &bfin_generic_error_irqchip);
+ set_irq_handler(irq, handle_level_irq);
+ }
+#endif
+
+#ifdef CONFIG_IRQCHIP_DEMUX_GPIO
+ for (irq = IRQ_PF0; irq < NR_IRQS; irq++) {
+ set_irq_chip(irq, &bfin_gpio_irqchip);
+ /* if configured as edge, then will be changed to do_edge_IRQ */
+ set_irq_handler(irq, handle_level_irq);
+ }
+#endif
+ bfin_write_IMASK(0);
+ CSYNC();
+ ilat = bfin_read_ILAT();
+ CSYNC();
+ bfin_write_ILAT(ilat);
+ CSYNC();
+
+ printk(KERN_INFO
+ "Configuring Blackfin Priority Driven Interrupts\n");
+ /* IMASK=xxx is equivalent to STI xx or irq_flags=xx,
+ * local_irq_enable()
+ */
+ program_IAR();
+ /* Therefore it's better to setup IARs before interrupts enabled */
+ search_IAR();
+
+ /* Enable interrupts IVG7-15 */
+ irq_flags = irq_flags | IMASK_IVG15 |
+ IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
+ IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 |
+ IMASK_IVGHW;
+
+ return 0;
+}
+
+#ifdef CONFIG_DO_IRQ_L1
+void do_irq(int vec, struct pt_regs *fp)__attribute__((l1_text));
+#endif
+
+void do_irq(int vec, struct pt_regs *fp)
+{
+ if (vec == EVT_IVTMR_P) {
+ vec = IRQ_CORETMR;
+ } else {
+ struct ivgx *ivg = ivg7_13[vec - IVG7].ifirst;
+ struct ivgx *ivg_stop = ivg7_13[vec - IVG7].istop;
+ unsigned long sic_status;
+
+ SSYNC();
+ sic_status = bfin_read_SIC_IMASK() & bfin_read_SIC_ISR();
+
+ for (;; ivg++) {
+ if (ivg >= ivg_stop) {
+ atomic_inc(&num_spurious);
+ return;
+ } else if (sic_status & ivg->isrflag)
+ break;
+ }
+ vec = ivg->irqno;
+ }
+ asm_do_IRQ(vec, fp);
+
+#ifdef CONFIG_KGDB
+ kgdb_process_breakpoint();
+#endif
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.