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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0fb849b9d7
Presently this is special-cased for early initialization. While there are situations where these static early initializations are still necessary, with minor changes it is possible to use this for the regular ioremap implementation as well. This allows us to kill off the special-casing for the remap completely and to start tidying up all of the SH-5 special-casing in drivers. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
179 lines
3.9 KiB
C
179 lines
3.9 KiB
C
/*
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* arch/sh/mach-cayman/irq.c - SH-5 Cayman Interrupt Support
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*
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* This file handles the board specific parts of the Cayman interrupt system
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*
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* Copyright (C) 2002 Stuart Menefy
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/signal.h>
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#include <cpu/irq.h>
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#include <asm/page.h>
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/* Setup for the SMSC FDC37C935 / LAN91C100FD */
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#define SMSC_IRQ IRQ_IRL1
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/* Setup for PCI Bus 2, which transmits interrupts via the EPLD */
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#define PCI2_IRQ IRQ_IRL3
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unsigned long epld_virt;
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#define EPLD_BASE 0x04002000
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#define EPLD_STATUS_BASE (epld_virt + 0x10)
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#define EPLD_MASK_BASE (epld_virt + 0x20)
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/* Note the SMSC SuperIO chip and SMSC LAN chip interrupts are all muxed onto
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the same SH-5 interrupt */
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static irqreturn_t cayman_interrupt_smsc(int irq, void *dev_id)
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{
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printk(KERN_INFO "CAYMAN: spurious SMSC interrupt\n");
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return IRQ_NONE;
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}
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static irqreturn_t cayman_interrupt_pci2(int irq, void *dev_id)
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{
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printk(KERN_INFO "CAYMAN: spurious PCI interrupt, IRQ %d\n", irq);
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return IRQ_NONE;
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}
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static struct irqaction cayman_action_smsc = {
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.name = "Cayman SMSC Mux",
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.handler = cayman_interrupt_smsc,
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.flags = IRQF_DISABLED,
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};
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static struct irqaction cayman_action_pci2 = {
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.name = "Cayman PCI2 Mux",
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.handler = cayman_interrupt_pci2,
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.flags = IRQF_DISABLED,
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};
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static void enable_cayman_irq(unsigned int irq)
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{
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unsigned long flags;
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unsigned long mask;
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unsigned int reg;
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unsigned char bit;
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irq -= START_EXT_IRQS;
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reg = EPLD_MASK_BASE + ((irq / 8) << 2);
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bit = 1<<(irq % 8);
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local_irq_save(flags);
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mask = ctrl_inl(reg);
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mask |= bit;
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ctrl_outl(mask, reg);
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local_irq_restore(flags);
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}
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void disable_cayman_irq(unsigned int irq)
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{
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unsigned long flags;
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unsigned long mask;
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unsigned int reg;
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unsigned char bit;
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irq -= START_EXT_IRQS;
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reg = EPLD_MASK_BASE + ((irq / 8) << 2);
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bit = 1<<(irq % 8);
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local_irq_save(flags);
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mask = ctrl_inl(reg);
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mask &= ~bit;
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ctrl_outl(mask, reg);
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local_irq_restore(flags);
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}
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static void ack_cayman_irq(unsigned int irq)
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{
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disable_cayman_irq(irq);
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}
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struct irq_chip cayman_irq_type = {
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.name = "Cayman-IRQ",
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.unmask = enable_cayman_irq,
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.mask = disable_cayman_irq,
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.mask_ack = ack_cayman_irq,
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};
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int cayman_irq_demux(int evt)
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{
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int irq = intc_evt_to_irq[evt];
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if (irq == SMSC_IRQ) {
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unsigned long status;
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int i;
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status = ctrl_inl(EPLD_STATUS_BASE) &
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ctrl_inl(EPLD_MASK_BASE) & 0xff;
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if (status == 0) {
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irq = -1;
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} else {
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for (i=0; i<8; i++) {
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if (status & (1<<i))
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break;
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}
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irq = START_EXT_IRQS + i;
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}
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}
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if (irq == PCI2_IRQ) {
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unsigned long status;
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int i;
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status = ctrl_inl(EPLD_STATUS_BASE + 3 * sizeof(u32)) &
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ctrl_inl(EPLD_MASK_BASE + 3 * sizeof(u32)) & 0xff;
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if (status == 0) {
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irq = -1;
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} else {
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for (i=0; i<8; i++) {
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if (status & (1<<i))
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break;
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}
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irq = START_EXT_IRQS + (3 * 8) + i;
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}
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}
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return irq;
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}
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#if defined(CONFIG_PROC_FS) && defined(CONFIG_SYSCTL)
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int cayman_irq_describe(char* p, int irq)
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{
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if (irq < NR_INTC_IRQS) {
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return intc_irq_describe(p, irq);
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} else if (irq < NR_INTC_IRQS + 8) {
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return sprintf(p, "(SMSC %d)", irq - NR_INTC_IRQS);
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} else if ((irq >= NR_INTC_IRQS + 24) && (irq < NR_INTC_IRQS + 32)) {
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return sprintf(p, "(PCI2 %d)", irq - (NR_INTC_IRQS + 24));
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}
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return 0;
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}
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#endif
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void init_cayman_irq(void)
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{
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int i;
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epld_virt = (unsigned long)ioremap_nocache(EPLD_BASE, 1024);
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if (!epld_virt) {
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printk(KERN_ERR "Cayman IRQ: Unable to remap EPLD\n");
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return;
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}
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for (i = 0; i < NR_EXT_IRQS; i++) {
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set_irq_chip_and_handler(START_EXT_IRQS + i, &cayman_irq_type,
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handle_level_irq);
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}
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/* Setup the SMSC interrupt */
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setup_irq(SMSC_IRQ, &cayman_action_smsc);
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setup_irq(PCI2_IRQ, &cayman_action_pci2);
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}
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