diff options
Diffstat (limited to 'arch/sh/boards/overdrive/irq.c')
| -rw-r--r-- | arch/sh/boards/overdrive/irq.c | 191 |
1 files changed, 0 insertions, 191 deletions
diff --git a/arch/sh/boards/overdrive/irq.c b/arch/sh/boards/overdrive/irq.c deleted file mode 100644 index 5d730c7..0000000 --- a/arch/sh/boards/overdrive/irq.c +++ /dev/null @@ -1,191 +0,0 @@ -/* - * Copyright (C) 2000 David J. Mckay (david.mckay@st.com) - * - * May be copied or modified under the terms of the GNU General Public - * License. See linux/COPYING for more information. - * - * Looks after interrupts on the overdrive board. - * - * Bases on the IPR irq system - */ - -#include <linux/init.h> -#include <linux/irq.h> - -#include <asm/system.h> -#include <asm/io.h> - -#include <asm/overdrive/overdrive.h> - -struct od_data { - int overdrive_irq; - int irq_mask; -}; - -#define NUM_EXTERNAL_IRQS 16 -#define EXTERNAL_IRQ_NOT_IN_USE (-1) -#define EXTERNAL_IRQ_NOT_ASSIGNED (-1) - -/* - * This table is used to determine what to program into the FPGA's CT register - * for the specified Linux IRQ. - * - * The irq_mask gives the interrupt number from the PCI board (PCI_Int(6:0)) - * but is one greater than that because the because the FPGA treats 0 - * as disabled, a value of 1 asserts PCI_Int0, and so on. - * - * The overdrive_irq specifies which of the eight interrupt sources generates - * that interrupt, and but is multiplied by four to give the bit offset into - * the CT register. - * - * The seven interrupts levels (SH4 IRL's) we have available here is hardwired - * by the EPLD. The assignments here of which PCI interrupt generates each - * level is arbitary. - */ -static struct od_data od_data_table[NUM_EXTERNAL_IRQS] = { - /* overdrive_irq , irq_mask */ - {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 0 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, 7}, /* 1 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, 6}, /* 2 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 3 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, 5}, /* 4 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 5 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 6 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, 4}, /* 7 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 8 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 9 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, 3}, /* 10 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, 2}, /* 11 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 12 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, 1}, /* 13 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE}, /* 14 */ - {EXTERNAL_IRQ_NOT_ASSIGNED, EXTERNAL_IRQ_NOT_IN_USE} /* 15 */ -}; - -static void set_od_data(int overdrive_irq, int irq) -{ - if (irq >= NUM_EXTERNAL_IRQS || irq < 0) - return; - od_data_table[irq].overdrive_irq = overdrive_irq << 2; -} - -static void enable_od_irq(unsigned int irq); -void disable_od_irq(unsigned int irq); - -/* shutdown is same as "disable" */ -#define shutdown_od_irq disable_od_irq - -static void mask_and_ack_od(unsigned int); -static void end_od_irq(unsigned int irq); - -static unsigned int startup_od_irq(unsigned int irq) -{ - enable_od_irq(irq); - return 0; /* never anything pending */ -} - -static struct hw_interrupt_type od_irq_type = { - .typename = "Overdrive-IRQ", - .startup = startup_od_irq, - .shutdown = shutdown_od_irq, - .enable = enable_od_irq, - .disable = disable_od_irq, - .ack = mask_and_ack_od, - .end = end_od_irq -}; - -static void disable_od_irq(unsigned int irq) -{ - unsigned val, flags; - int overdrive_irq; - unsigned mask; - - /* Not a valid interrupt */ - if (irq < 0 || irq >= NUM_EXTERNAL_IRQS) - return; - - /* Is is necessary to use a cli here? Would a spinlock not be - * mroe efficient? - */ - local_irq_save(flags); - overdrive_irq = od_data_table[irq].overdrive_irq; - if (overdrive_irq != EXTERNAL_IRQ_NOT_ASSIGNED) { - mask = ~(0x7 << overdrive_irq); - val = ctrl_inl(OVERDRIVE_INT_CT); - val &= mask; - ctrl_outl(val, OVERDRIVE_INT_CT); - } - local_irq_restore(flags); -} - -static void enable_od_irq(unsigned int irq) -{ - unsigned val, flags; - int overdrive_irq; - unsigned mask; - - /* Not a valid interrupt */ - if (irq < 0 || irq >= NUM_EXTERNAL_IRQS) - return; - - /* Set priority in OD back to original value */ - local_irq_save(flags); - /* This one is not in use currently */ - overdrive_irq = od_data_table[irq].overdrive_irq; - if (overdrive_irq != EXTERNAL_IRQ_NOT_ASSIGNED) { - val = ctrl_inl(OVERDRIVE_INT_CT); - mask = ~(0x7 << overdrive_irq); - val &= mask; - mask = od_data_table[irq].irq_mask << overdrive_irq; - val |= mask; - ctrl_outl(val, OVERDRIVE_INT_CT); - } - local_irq_restore(flags); -} - - - -/* this functions sets the desired irq handler to be an overdrive type */ -static void __init make_od_irq(unsigned int irq) -{ - disable_irq_nosync(irq); - irq_desc[irq].chip = &od_irq_type; - disable_od_irq(irq); -} - - -static void mask_and_ack_od(unsigned int irq) -{ - disable_od_irq(irq); -} - -static void end_od_irq(unsigned int irq) -{ - enable_od_irq(irq); -} - -void __init init_overdrive_irq(void) -{ - int i; - - /* Disable all interrupts */ - ctrl_outl(0, OVERDRIVE_INT_CT); - - /* Update interrupt pin mode to use encoded interrupts */ - i = ctrl_inw(INTC_ICR); - i &= ~INTC_ICR_IRLM; - ctrl_outw(i, INTC_ICR); - - for (i = 0; i < NUM_EXTERNAL_IRQS; i++) { - if (od_data_table[i].irq_mask != EXTERNAL_IRQ_NOT_IN_USE) { - make_od_irq(i); - } else if (i != 15) { // Cannot use imask on level 15 - make_imask_irq(i); - } - } - - /* Set up the interrupts */ - set_od_data(OVERDRIVE_PCI_INTA, OVERDRIVE_PCI_IRQ1); - set_od_data(OVERDRIVE_PCI_INTB, OVERDRIVE_PCI_IRQ2); - set_od_data(OVERDRIVE_AUDIO_INT, OVERDRIVE_ESS_IRQ); -} |
