270 lines
6.8 KiB
C
270 lines
6.8 KiB
C
/*
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* Platform information definitions.
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*
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* Copied from arch/ppc/syslib/cpm2_pic.c with minor subsequent updates
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* to make in work in arch/powerpc/. Original (c) belongs to Dan Malek.
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*
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* Author: Vitaly Bordug <vbordug@ru.mvista.com>
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*
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* 1999-2001 (c) Dan Malek <dan@embeddedalley.com>
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* 2006 (c) MontaVista Software, Inc.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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/* The CPM2 internal interrupt controller. It is usually
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* the only interrupt controller.
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* There are two 32-bit registers (high/low) for up to 64
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* possible interrupts.
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*
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* Now, the fun starts.....Interrupt Numbers DO NOT MAP
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* in a simple arithmetic fashion to mask or pending registers.
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* That is, interrupt 4 does not map to bit position 4.
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* We create two tables, indexed by vector number, to indicate
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* which register to use and which bit in the register to use.
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*/
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#include <linux/stddef.h>
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <asm/immap_cpm2.h>
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#include <asm/mpc8260.h>
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#include <asm/io.h>
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#include <asm/fs_pd.h>
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#include "cpm2_pic.h"
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/* External IRQS */
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#define CPM2_IRQ_EXT1 19
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#define CPM2_IRQ_EXT7 25
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/* Port C IRQS */
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#define CPM2_IRQ_PORTC15 48
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#define CPM2_IRQ_PORTC0 63
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static intctl_cpm2_t __iomem *cpm2_intctl;
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static struct irq_domain *cpm2_pic_host;
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static unsigned long ppc_cached_irq_mask[2]; /* 2 32-bit registers */
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static const u_char irq_to_siureg[] = {
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0
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};
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/* bit numbers do not match the docs, these are precomputed so the bit for
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* a given irq is (1 << irq_to_siubit[irq]) */
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static const u_char irq_to_siubit[] = {
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0, 15, 14, 13, 12, 11, 10, 9,
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8, 7, 6, 5, 4, 3, 2, 1,
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2, 1, 0, 14, 13, 12, 11, 10,
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9, 8, 7, 6, 5, 4, 3, 0,
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31, 30, 29, 28, 27, 26, 25, 24,
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23, 22, 21, 20, 19, 18, 17, 16,
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16, 17, 18, 19, 20, 21, 22, 23,
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24, 25, 26, 27, 28, 29, 30, 31,
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};
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static void cpm2_mask_irq(struct irq_data *d)
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{
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int bit, word;
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unsigned int irq_nr = irqd_to_hwirq(d);
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bit = irq_to_siubit[irq_nr];
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word = irq_to_siureg[irq_nr];
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ppc_cached_irq_mask[word] &= ~(1 << bit);
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out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);
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}
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static void cpm2_unmask_irq(struct irq_data *d)
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{
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int bit, word;
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unsigned int irq_nr = irqd_to_hwirq(d);
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bit = irq_to_siubit[irq_nr];
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word = irq_to_siureg[irq_nr];
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ppc_cached_irq_mask[word] |= 1 << bit;
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out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);
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}
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static void cpm2_ack(struct irq_data *d)
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{
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int bit, word;
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unsigned int irq_nr = irqd_to_hwirq(d);
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bit = irq_to_siubit[irq_nr];
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word = irq_to_siureg[irq_nr];
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out_be32(&cpm2_intctl->ic_sipnrh + word, 1 << bit);
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}
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static void cpm2_end_irq(struct irq_data *d)
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{
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int bit, word;
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unsigned int irq_nr = irqd_to_hwirq(d);
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bit = irq_to_siubit[irq_nr];
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word = irq_to_siureg[irq_nr];
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ppc_cached_irq_mask[word] |= 1 << bit;
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out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);
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/*
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* Work around large numbers of spurious IRQs on PowerPC 82xx
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* systems.
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*/
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mb();
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}
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static int cpm2_set_irq_type(struct irq_data *d, unsigned int flow_type)
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{
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unsigned int src = irqd_to_hwirq(d);
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unsigned int vold, vnew, edibit;
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/* Port C interrupts are either IRQ_TYPE_EDGE_FALLING or
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* IRQ_TYPE_EDGE_BOTH (default). All others are IRQ_TYPE_EDGE_FALLING
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* or IRQ_TYPE_LEVEL_LOW (default)
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*/
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if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0) {
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if (flow_type == IRQ_TYPE_NONE)
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flow_type = IRQ_TYPE_EDGE_BOTH;
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if (flow_type != IRQ_TYPE_EDGE_BOTH &&
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flow_type != IRQ_TYPE_EDGE_FALLING)
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goto err_sense;
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} else {
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if (flow_type == IRQ_TYPE_NONE)
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flow_type = IRQ_TYPE_LEVEL_LOW;
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if (flow_type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH))
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goto err_sense;
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}
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irqd_set_trigger_type(d, flow_type);
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if (flow_type & IRQ_TYPE_LEVEL_LOW)
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irq_set_handler_locked(d, handle_level_irq);
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else
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irq_set_handler_locked(d, handle_edge_irq);
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/* internal IRQ senses are LEVEL_LOW
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* EXT IRQ and Port C IRQ senses are programmable
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*/
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if (src >= CPM2_IRQ_EXT1 && src <= CPM2_IRQ_EXT7)
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edibit = (14 - (src - CPM2_IRQ_EXT1));
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else
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if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0)
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edibit = (31 - (CPM2_IRQ_PORTC0 - src));
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else
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return (flow_type & IRQ_TYPE_LEVEL_LOW) ?
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IRQ_SET_MASK_OK_NOCOPY : -EINVAL;
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vold = in_be32(&cpm2_intctl->ic_siexr);
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if ((flow_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_FALLING)
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vnew = vold | (1 << edibit);
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else
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vnew = vold & ~(1 << edibit);
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if (vold != vnew)
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out_be32(&cpm2_intctl->ic_siexr, vnew);
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return IRQ_SET_MASK_OK_NOCOPY;
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err_sense:
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pr_err("CPM2 PIC: sense type 0x%x not supported\n", flow_type);
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return -EINVAL;
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}
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static struct irq_chip cpm2_pic = {
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.name = "CPM2 SIU",
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.irq_mask = cpm2_mask_irq,
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.irq_unmask = cpm2_unmask_irq,
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.irq_ack = cpm2_ack,
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.irq_eoi = cpm2_end_irq,
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.irq_set_type = cpm2_set_irq_type,
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.flags = IRQCHIP_EOI_IF_HANDLED,
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};
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unsigned int cpm2_get_irq(void)
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{
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int irq;
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unsigned long bits;
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/* For CPM2, read the SIVEC register and shift the bits down
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* to get the irq number. */
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bits = in_be32(&cpm2_intctl->ic_sivec);
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irq = bits >> 26;
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if (irq == 0)
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return(-1);
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return irq_linear_revmap(cpm2_pic_host, irq);
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}
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static int cpm2_pic_host_map(struct irq_domain *h, unsigned int virq,
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irq_hw_number_t hw)
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{
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pr_debug("cpm2_pic_host_map(%d, 0x%lx)\n", virq, hw);
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irq_set_status_flags(virq, IRQ_LEVEL);
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irq_set_chip_and_handler(virq, &cpm2_pic, handle_level_irq);
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return 0;
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}
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static const struct irq_domain_ops cpm2_pic_host_ops = {
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.map = cpm2_pic_host_map,
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.xlate = irq_domain_xlate_onetwocell,
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};
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void cpm2_pic_init(struct device_node *node)
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{
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int i;
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cpm2_intctl = cpm2_map(im_intctl);
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/* Clear the CPM IRQ controller, in case it has any bits set
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* from the bootloader
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*/
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/* Mask out everything */
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out_be32(&cpm2_intctl->ic_simrh, 0x00000000);
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out_be32(&cpm2_intctl->ic_simrl, 0x00000000);
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wmb();
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/* Ack everything */
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out_be32(&cpm2_intctl->ic_sipnrh, 0xffffffff);
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out_be32(&cpm2_intctl->ic_sipnrl, 0xffffffff);
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wmb();
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/* Dummy read of the vector */
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i = in_be32(&cpm2_intctl->ic_sivec);
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rmb();
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/* Initialize the default interrupt mapping priorities,
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* in case the boot rom changed something on us.
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*/
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out_be16(&cpm2_intctl->ic_sicr, 0);
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out_be32(&cpm2_intctl->ic_scprrh, 0x05309770);
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out_be32(&cpm2_intctl->ic_scprrl, 0x05309770);
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/* create a legacy host */
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cpm2_pic_host = irq_domain_add_linear(node, 64, &cpm2_pic_host_ops, NULL);
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if (cpm2_pic_host == NULL) {
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printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
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return;
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}
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}
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