Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 238 insertions, 0 deletions

diff --git a/arch/alpha/kernel/sys_eb64p.c b/arch/alpha/kernel/sys_eb64p.c
new file mode 100644
index 000000000..3c43fd347
--- /dev/null
+++ b/arch/alpha/kernel/sys_eb64p.c
@@ -0,0 +1,238 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *	linux/arch/alpha/kernel/sys_eb64p.c
+ *
+ *	Copyright (C) 1995 David A Rusling
+ *	Copyright (C) 1996 Jay A Estabrook
+ *	Copyright (C) 1998, 1999 Richard Henderson
+ *
+ * Code supporting the EB64+ and EB66.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+
+#include <asm/ptrace.h>
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/core_apecs.h>
+#include <asm/core_lca.h>
+#include <asm/hwrpb.h>
+#include <asm/tlbflush.h>
+
+#include "proto.h"
+#include "irq_impl.h"
+#include "pci_impl.h"
+#include "machvec_impl.h"
+
+
+/* Note mask bit is true for DISABLED irqs.  */
+static unsigned int cached_irq_mask = -1;
+
+static inline void
+eb64p_update_irq_hw(unsigned int irq, unsigned long mask)
+{
+	outb(mask >> (irq >= 24 ? 24 : 16), (irq >= 24 ? 0x27 : 0x26));
+}
+
+static inline void
+eb64p_enable_irq(struct irq_data *d)
+{
+	eb64p_update_irq_hw(d->irq, cached_irq_mask &= ~(1 << d->irq));
+}
+
+static void
+eb64p_disable_irq(struct irq_data *d)
+{
+	eb64p_update_irq_hw(d->irq, cached_irq_mask |= 1 << d->irq);
+}
+
+static struct irq_chip eb64p_irq_type = {
+	.name		= "EB64P",
+	.irq_unmask	= eb64p_enable_irq,
+	.irq_mask	= eb64p_disable_irq,
+	.irq_mask_ack	= eb64p_disable_irq,
+};
+
+static void 
+eb64p_device_interrupt(unsigned long vector)
+{
+	unsigned long pld;
+	unsigned int i;
+
+	/* Read the interrupt summary registers */
+	pld = inb(0x26) | (inb(0x27) << 8);
+
+	/*
+	 * Now, for every possible bit set, work through
+	 * them and call the appropriate interrupt handler.
+	 */
+	while (pld) {
+		i = ffz(~pld);
+		pld &= pld - 1;	/* clear least bit set */
+
+		if (i == 5) {
+			isa_device_interrupt(vector);
+		} else {
+			handle_irq(16 + i);
+		}
+	}
+}
+
+static void __init
+eb64p_init_irq(void)
+{
+	long i;
+
+#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_CABRIOLET)
+	/*
+	 * CABRIO SRM may not set variation correctly, so here we test
+	 * the high word of the interrupt summary register for the RAZ
+	 * bits, and hope that a true EB64+ would read all ones...
+	 */
+	if (inw(0x806) != 0xffff) {
+		extern struct alpha_machine_vector cabriolet_mv;
+
+		printk("Detected Cabriolet: correcting HWRPB.\n");
+
+		hwrpb->sys_variation |= 2L << 10;
+		hwrpb_update_checksum(hwrpb);
+
+		alpha_mv = cabriolet_mv;
+		alpha_mv.init_irq();
+		return;
+	}
+#endif /* GENERIC */
+
+	outb(0xff, 0x26);
+	outb(0xff, 0x27);
+
+	init_i8259a_irqs();
+
+	for (i = 16; i < 32; ++i) {
+		irq_set_chip_and_handler(i, &eb64p_irq_type, handle_level_irq);
+		irq_set_status_flags(i, IRQ_LEVEL);
+	}
+
+	common_init_isa_dma();
+	if (request_irq(16 + 5, no_action, 0, "isa-cascade", NULL))
+		pr_err("Failed to register isa-cascade interrupt\n");
+}
+
+/*
+ * PCI Fixup configuration.
+ *
+ * There are two 8 bit external summary registers as follows:
+ *
+ * Summary @ 0x26:
+ * Bit      Meaning
+ * 0        Interrupt Line A from slot 0
+ * 1        Interrupt Line A from slot 1
+ * 2        Interrupt Line B from slot 0
+ * 3        Interrupt Line B from slot 1
+ * 4        Interrupt Line C from slot 0
+ * 5        Interrupt line from the two ISA PICs
+ * 6        Tulip
+ * 7        NCR SCSI
+ *
+ * Summary @ 0x27
+ * Bit      Meaning
+ * 0        Interrupt Line C from slot 1
+ * 1        Interrupt Line D from slot 0
+ * 2        Interrupt Line D from slot 1
+ * 3        RAZ
+ * 4        RAZ
+ * 5        RAZ
+ * 6        RAZ
+ * 7        RAZ
+ *
+ * The device to slot mapping looks like:
+ *
+ * Slot     Device
+ *  5       NCR SCSI controller
+ *  6       PCI on board slot 0
+ *  7       PCI on board slot 1
+ *  8       Intel SIO PCI-ISA bridge chip
+ *  9       Tulip - DECchip 21040 Ethernet controller
+ *   
+ *
+ * This two layered interrupt approach means that we allocate IRQ 16 and 
+ * above for PCI interrupts.  The IRQ relates to which bit the interrupt
+ * comes in on.  This makes interrupt processing much easier.
+ */
+
+static int
+eb64p_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	static char irq_tab[5][5] = {
+		/*INT  INTA  INTB  INTC   INTD */
+		{16+7, 16+7, 16+7, 16+7,  16+7},  /* IdSel 5,  slot ?, ?? */
+		{16+0, 16+0, 16+2, 16+4,  16+9},  /* IdSel 6,  slot ?, ?? */
+		{16+1, 16+1, 16+3, 16+8, 16+10},  /* IdSel 7,  slot ?, ?? */
+		{  -1,   -1,   -1,   -1,    -1},  /* IdSel 8,  SIO */
+		{16+6, 16+6, 16+6, 16+6,  16+6},  /* IdSel 9,  TULIP */
+	};
+	const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
+	return COMMON_TABLE_LOOKUP;
+}
+
+
+/*
+ * The System Vector
+ */
+
+#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB64P)
+struct alpha_machine_vector eb64p_mv __initmv = {
+	.vector_name		= "EB64+",
+	DO_EV4_MMU,
+	DO_DEFAULT_RTC,
+	DO_APECS_IO,
+	.machine_check		= apecs_machine_check,
+	.max_isa_dma_address	= ALPHA_MAX_ISA_DMA_ADDRESS,
+	.min_io_address		= DEFAULT_IO_BASE,
+	.min_mem_address	= APECS_AND_LCA_DEFAULT_MEM_BASE,
+
+	.nr_irqs		= 32,
+	.device_interrupt	= eb64p_device_interrupt,
+
+	.init_arch		= apecs_init_arch,
+	.init_irq		= eb64p_init_irq,
+	.init_rtc		= common_init_rtc,
+	.init_pci		= common_init_pci,
+	.kill_arch		= NULL,
+	.pci_map_irq		= eb64p_map_irq,
+	.pci_swizzle		= common_swizzle,
+};
+ALIAS_MV(eb64p)
+#endif
+
+#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB66)
+struct alpha_machine_vector eb66_mv __initmv = {
+	.vector_name		= "EB66",
+	DO_EV4_MMU,
+	DO_DEFAULT_RTC,
+	DO_LCA_IO,
+	.machine_check		= lca_machine_check,
+	.max_isa_dma_address	= ALPHA_MAX_ISA_DMA_ADDRESS,
+	.min_io_address		= DEFAULT_IO_BASE,
+	.min_mem_address	= APECS_AND_LCA_DEFAULT_MEM_BASE,
+
+	.nr_irqs		= 32,
+	.device_interrupt	= eb64p_device_interrupt,
+
+	.init_arch		= lca_init_arch,
+	.init_irq		= eb64p_init_irq,
+	.init_rtc		= common_init_rtc,
+	.init_pci		= common_init_pci,
+	.pci_map_irq		= eb64p_map_irq,
+	.pci_swizzle		= common_swizzle,
+};
+ALIAS_MV(eb66)
+#endif