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391 lines
10 KiB
391 lines
10 KiB
/* |
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* arch/m68k/atari/ataints.c -- Atari Linux interrupt handling code |
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* |
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* 5/2/94 Roman Hodek: |
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* Added support for TT interrupts; setup for TT SCU (may someone has |
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* twiddled there and we won't get the right interrupts :-() |
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* |
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* Major change: The device-independent code in m68k/ints.c didn't know |
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* about non-autovec ints yet. It hardcoded the number of possible ints to |
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* 7 (IRQ1...IRQ7). But the Atari has lots of non-autovec ints! I made the |
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* number of possible ints a constant defined in interrupt.h, which is |
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* 47 for the Atari. So we can call request_irq() for all Atari interrupts |
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* just the normal way. Additionally, all vectors >= 48 are initialized to |
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* call trap() instead of inthandler(). This must be changed here, too. |
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* |
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* 1995-07-16 Lars Brinkhoff <[email protected]>: |
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* Corrected a bug in atari_add_isr() which rejected all SCC |
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* interrupt sources if there were no TT MFP! |
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* |
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* 12/13/95: New interface functions atari_level_triggered_int() and |
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* atari_register_vme_int() as support for level triggered VME interrupts. |
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* |
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* 02/12/96: (Roman) |
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* Total rewrite of Atari interrupt handling, for new scheme see comments |
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* below. |
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* |
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* 1996-09-03 lars brinkhoff <[email protected]>: |
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* Added new function atari_unregister_vme_int(), and |
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* modified atari_register_vme_int() as well as IS_VALID_INTNO() |
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* to work with it. |
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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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*/ |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/kernel_stat.h> |
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#include <linux/init.h> |
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#include <linux/seq_file.h> |
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#include <linux/module.h> |
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#include <linux/irq.h> |
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#include <asm/traps.h> |
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#include <asm/atarihw.h> |
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#include <asm/atariints.h> |
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#include <asm/atari_stdma.h> |
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#include <asm/irq.h> |
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#include <asm/entry.h> |
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#include <asm/io.h> |
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/* |
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* Atari interrupt handling scheme: |
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* -------------------------------- |
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* |
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* All interrupt source have an internal number (defined in |
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* <asm/atariints.h>): Autovector interrupts are 1..7, then follow ST-MFP, |
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* TT-MFP, SCC, and finally VME interrupts. Vector numbers for the latter can |
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* be allocated by atari_register_vme_int(). |
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*/ |
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/* |
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* Bitmap for free interrupt vector numbers |
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* (new vectors starting from 0x70 can be allocated by |
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* atari_register_vme_int()) |
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*/ |
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static int free_vme_vec_bitmap; |
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/* GK: |
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* HBL IRQ handler for Falcon. Nobody needs it :-) |
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* ++andreas: raise ipl to disable further HBLANK interrupts. |
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*/ |
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asmlinkage void falcon_hblhandler(void); |
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asm(".text\n" |
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__ALIGN_STR "\n\t" |
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"falcon_hblhandler:\n\t" |
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"orw #0x200,%sp@\n\t" /* set saved ipl to 2 */ |
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"rte"); |
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extern void atari_microwire_cmd(int cmd); |
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static unsigned int atari_irq_startup(struct irq_data *data) |
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{ |
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unsigned int irq = data->irq; |
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m68k_irq_startup(data); |
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atari_turnon_irq(irq); |
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atari_enable_irq(irq); |
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return 0; |
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} |
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static void atari_irq_shutdown(struct irq_data *data) |
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{ |
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unsigned int irq = data->irq; |
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atari_disable_irq(irq); |
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atari_turnoff_irq(irq); |
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m68k_irq_shutdown(data); |
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if (irq == IRQ_AUTO_4) |
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vectors[VEC_INT4] = falcon_hblhandler; |
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} |
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static void atari_irq_enable(struct irq_data *data) |
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{ |
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atari_enable_irq(data->irq); |
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} |
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static void atari_irq_disable(struct irq_data *data) |
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{ |
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atari_disable_irq(data->irq); |
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} |
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static struct irq_chip atari_irq_chip = { |
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.name = "atari", |
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.irq_startup = atari_irq_startup, |
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.irq_shutdown = atari_irq_shutdown, |
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.irq_enable = atari_irq_enable, |
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.irq_disable = atari_irq_disable, |
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}; |
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/* |
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* ST-MFP timer D chained interrupts - each driver gets its own timer |
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* interrupt instance. |
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*/ |
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struct mfptimerbase { |
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volatile struct MFP *mfp; |
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unsigned char mfp_mask, mfp_data; |
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unsigned short int_mask; |
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int handler_irq, mfptimer_irq, server_irq; |
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char *name; |
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} stmfp_base = { |
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.mfp = &st_mfp, |
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.int_mask = 0x0, |
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.handler_irq = IRQ_MFP_TIMD, |
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.mfptimer_irq = IRQ_MFP_TIMER1, |
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.name = "MFP Timer D" |
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}; |
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static irqreturn_t mfp_timer_d_handler(int irq, void *dev_id) |
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{ |
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struct mfptimerbase *base = dev_id; |
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int mach_irq; |
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unsigned char ints; |
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mach_irq = base->mfptimer_irq; |
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ints = base->int_mask; |
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for (; ints; mach_irq++, ints >>= 1) { |
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if (ints & 1) |
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generic_handle_irq(mach_irq); |
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} |
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return IRQ_HANDLED; |
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} |
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static void atari_mfptimer_enable(struct irq_data *data) |
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{ |
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int mfp_num = data->irq - IRQ_MFP_TIMER1; |
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stmfp_base.int_mask |= 1 << mfp_num; |
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atari_enable_irq(IRQ_MFP_TIMD); |
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} |
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static void atari_mfptimer_disable(struct irq_data *data) |
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{ |
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int mfp_num = data->irq - IRQ_MFP_TIMER1; |
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stmfp_base.int_mask &= ~(1 << mfp_num); |
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if (!stmfp_base.int_mask) |
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atari_disable_irq(IRQ_MFP_TIMD); |
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} |
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static struct irq_chip atari_mfptimer_chip = { |
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.name = "timer_d", |
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.irq_enable = atari_mfptimer_enable, |
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.irq_disable = atari_mfptimer_disable, |
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}; |
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/* |
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* EtherNAT CPLD interrupt handling |
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* CPLD interrupt register is at phys. 0x80000023 |
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* Need this mapped in at interrupt startup time |
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* Possibly need this mapped on demand anyway - |
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* EtherNAT USB driver needs to disable IRQ before |
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* startup! |
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*/ |
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static unsigned char *enat_cpld; |
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static unsigned int atari_ethernat_startup(struct irq_data *data) |
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{ |
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int enat_num = 140 - data->irq + 1; |
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m68k_irq_startup(data); |
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/* |
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* map CPLD interrupt register |
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*/ |
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if (!enat_cpld) |
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enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2); |
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/* |
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* do _not_ enable the USB chip interrupt here - causes interrupt storm |
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* and triggers dead interrupt watchdog |
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* Need to reset the USB chip to a sane state in early startup before |
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* removing this hack |
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*/ |
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if (enat_num == 1) |
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*enat_cpld |= 1 << enat_num; |
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return 0; |
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} |
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static void atari_ethernat_enable(struct irq_data *data) |
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{ |
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int enat_num = 140 - data->irq + 1; |
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/* |
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* map CPLD interrupt register |
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*/ |
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if (!enat_cpld) |
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enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2); |
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*enat_cpld |= 1 << enat_num; |
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} |
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static void atari_ethernat_disable(struct irq_data *data) |
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{ |
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int enat_num = 140 - data->irq + 1; |
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/* |
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* map CPLD interrupt register |
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*/ |
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if (!enat_cpld) |
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enat_cpld = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0x2); |
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*enat_cpld &= ~(1 << enat_num); |
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} |
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static void atari_ethernat_shutdown(struct irq_data *data) |
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{ |
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int enat_num = 140 - data->irq + 1; |
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if (enat_cpld) { |
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*enat_cpld &= ~(1 << enat_num); |
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iounmap(enat_cpld); |
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enat_cpld = NULL; |
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} |
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} |
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static struct irq_chip atari_ethernat_chip = { |
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.name = "ethernat", |
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.irq_startup = atari_ethernat_startup, |
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.irq_shutdown = atari_ethernat_shutdown, |
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.irq_enable = atari_ethernat_enable, |
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.irq_disable = atari_ethernat_disable, |
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}; |
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/* |
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* void atari_init_IRQ (void) |
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* |
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* Parameters: None |
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* |
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* Returns: Nothing |
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* |
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* This function should be called during kernel startup to initialize |
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* the atari IRQ handling routines. |
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*/ |
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void __init atari_init_IRQ(void) |
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{ |
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m68k_setup_user_interrupt(VEC_USER, NUM_ATARI_SOURCES - IRQ_USER); |
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m68k_setup_irq_controller(&atari_irq_chip, handle_simple_irq, 1, |
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NUM_ATARI_SOURCES - 1); |
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/* Initialize the MFP(s) */ |
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#ifdef ATARI_USE_SOFTWARE_EOI |
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st_mfp.vec_adr = 0x48; /* Software EOI-Mode */ |
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#else |
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st_mfp.vec_adr = 0x40; /* Automatic EOI-Mode */ |
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#endif |
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st_mfp.int_en_a = 0x00; /* turn off MFP-Ints */ |
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st_mfp.int_en_b = 0x00; |
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st_mfp.int_mk_a = 0xff; /* no Masking */ |
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st_mfp.int_mk_b = 0xff; |
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if (ATARIHW_PRESENT(TT_MFP)) { |
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#ifdef ATARI_USE_SOFTWARE_EOI |
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tt_mfp.vec_adr = 0x58; /* Software EOI-Mode */ |
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#else |
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tt_mfp.vec_adr = 0x50; /* Automatic EOI-Mode */ |
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#endif |
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tt_mfp.int_en_a = 0x00; /* turn off MFP-Ints */ |
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tt_mfp.int_en_b = 0x00; |
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tt_mfp.int_mk_a = 0xff; /* no Masking */ |
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tt_mfp.int_mk_b = 0xff; |
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} |
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if (ATARIHW_PRESENT(SCC) && !atari_SCC_reset_done) { |
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atari_scc.cha_a_ctrl = 9; |
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MFPDELAY(); |
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atari_scc.cha_a_ctrl = (char) 0xc0; /* hardware reset */ |
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} |
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if (ATARIHW_PRESENT(SCU)) { |
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/* init the SCU if present */ |
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tt_scu.sys_mask = 0x10; /* enable VBL (for the cursor) and |
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* disable HSYNC interrupts (who |
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* needs them?) MFP and SCC are |
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* enabled in VME mask |
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*/ |
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tt_scu.vme_mask = 0x60; /* enable MFP and SCC ints */ |
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} else { |
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/* If no SCU and no Hades, the HSYNC interrupt needs to be |
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* disabled this way. (Else _inthandler in kernel/sys_call.S |
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* gets overruns) |
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*/ |
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vectors[VEC_INT2] = falcon_hblhandler; |
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vectors[VEC_INT4] = falcon_hblhandler; |
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} |
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if (ATARIHW_PRESENT(PCM_8BIT) && ATARIHW_PRESENT(MICROWIRE)) { |
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/* Initialize the LM1992 Sound Controller to enable |
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the PSG sound. This is misplaced here, it should |
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be in an atasound_init(), that doesn't exist yet. */ |
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atari_microwire_cmd(MW_LM1992_PSG_HIGH); |
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} |
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stdma_init(); |
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/* Initialize the PSG: all sounds off, both ports output */ |
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sound_ym.rd_data_reg_sel = 7; |
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sound_ym.wd_data = 0xff; |
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m68k_setup_irq_controller(&atari_mfptimer_chip, handle_simple_irq, |
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IRQ_MFP_TIMER1, 8); |
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irq_set_status_flags(IRQ_MFP_TIMER1, IRQ_IS_POLLED); |
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irq_set_status_flags(IRQ_MFP_TIMER2, IRQ_IS_POLLED); |
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/* prepare timer D data for use as poll interrupt */ |
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/* set Timer D data Register - needs to be > 0 */ |
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st_mfp.tim_dt_d = 254; /* < 100 Hz */ |
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/* start timer D, div = 1:100 */ |
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st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 0xf0) | 0x6; |
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/* request timer D dispatch handler */ |
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if (request_irq(IRQ_MFP_TIMD, mfp_timer_d_handler, IRQF_SHARED, |
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stmfp_base.name, &stmfp_base)) |
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pr_err("Couldn't register %s interrupt\n", stmfp_base.name); |
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/* |
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* EtherNAT ethernet / USB interrupt handlers |
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*/ |
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m68k_setup_irq_controller(&atari_ethernat_chip, handle_simple_irq, |
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139, 2); |
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} |
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/* |
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* atari_register_vme_int() returns the number of a free interrupt vector for |
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* hardware with a programmable int vector (probably a VME board). |
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*/ |
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unsigned int atari_register_vme_int(void) |
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{ |
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int i; |
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for (i = 0; i < 32; i++) |
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if ((free_vme_vec_bitmap & (1 << i)) == 0) |
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break; |
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if (i == 16) |
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return 0; |
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free_vme_vec_bitmap |= 1 << i; |
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return VME_SOURCE_BASE + i; |
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} |
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EXPORT_SYMBOL(atari_register_vme_int); |
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void atari_unregister_vme_int(unsigned int irq) |
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{ |
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if (irq >= VME_SOURCE_BASE && irq < VME_SOURCE_BASE + VME_MAX_SOURCES) { |
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irq -= VME_SOURCE_BASE; |
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free_vme_vec_bitmap &= ~(1 << irq); |
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} |
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} |
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EXPORT_SYMBOL(atari_unregister_vme_int); |
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