diff options
Diffstat (limited to 'arch/mips/momentum/ocelot_c/uart-irq.c')
| -rw-r--r-- | arch/mips/momentum/ocelot_c/uart-irq.c | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/arch/mips/momentum/ocelot_c/uart-irq.c b/arch/mips/momentum/ocelot_c/uart-irq.c deleted file mode 100644 index 9f33d8f1d82..00000000000 --- a/arch/mips/momentum/ocelot_c/uart-irq.c +++ /dev/null @@ -1,146 +0,0 @@ -/* - * Copyright 2002 Momentum Computer - * Author: mdharm@momenco.com - * - * arch/mips/momentum/ocelot_c/uart-irq.c - * Interrupt routines for UARTs. Interrupt numbers are assigned from - * 80 to 81 (2 interrupt sources). - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - */ - -#include <linux/module.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/kernel.h> -#include <asm/ptrace.h> -#include <linux/sched.h> -#include <linux/kernel_stat.h> -#include <asm/io.h> -#include <asm/irq.h> -#include "ocelot_c_fpga.h" - -static inline int ls1bit8(unsigned int x) -{ - int b = 7, s; - - s = 4; if (((unsigned char)(x << 4)) == 0) s = 0; b -= s; x <<= s; - s = 2; if (((unsigned char)(x << 2)) == 0) s = 0; b -= s; x <<= s; - s = 1; if (((unsigned char)(x << 1)) == 0) s = 0; b -= s; - - return b; -} - -/* mask off an interrupt -- 0 is enable, 1 is disable */ -static inline void mask_uart_irq(unsigned int irq) -{ - uint8_t value; - - value = OCELOT_FPGA_READ(UART_INTMASK); - value |= 1 << (irq - 74); - OCELOT_FPGA_WRITE(value, UART_INTMASK); - - /* read the value back to assure that it's really been written */ - value = OCELOT_FPGA_READ(UART_INTMASK); -} - -/* unmask an interrupt -- 0 is enable, 1 is disable */ -static inline void unmask_uart_irq(unsigned int irq) -{ - uint8_t value; - - value = OCELOT_FPGA_READ(UART_INTMASK); - value &= ~(1 << (irq - 74)); - OCELOT_FPGA_WRITE(value, UART_INTMASK); - - /* read the value back to assure that it's really been written */ - value = OCELOT_FPGA_READ(UART_INTMASK); -} - -/* - * Enables the IRQ in the FPGA - */ -static void enable_uart_irq(unsigned int irq) -{ - unmask_uart_irq(irq); -} - -/* - * Initialize the IRQ in the FPGA - */ -static unsigned int startup_uart_irq(unsigned int irq) -{ - unmask_uart_irq(irq); - return 0; -} - -/* - * Disables the IRQ in the FPGA - */ -static void disable_uart_irq(unsigned int irq) -{ - mask_uart_irq(irq); -} - -/* - * Masks and ACKs an IRQ - */ -static void mask_and_ack_uart_irq(unsigned int irq) -{ - mask_uart_irq(irq); -} - -/* - * End IRQ processing - */ -static void end_uart_irq(unsigned int irq) -{ - if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) - unmask_uart_irq(irq); -} - -/* - * Interrupt handler for interrupts coming from the FPGA chip. - */ -void ll_uart_irq(struct pt_regs *regs) -{ - unsigned int irq_src, irq_mask; - - /* read the interrupt status registers */ - irq_src = OCELOT_FPGA_READ(UART_INTSTAT); - irq_mask = OCELOT_FPGA_READ(UART_INTMASK); - - /* mask for just the interrupts we want */ - irq_src &= ~irq_mask; - - do_IRQ(ls1bit8(irq_src) + 74, regs); -} - -#define shutdown_uart_irq disable_uart_irq - -struct irq_chip uart_irq_type = { - .typename = "UART/FPGA", - .startup = startup_uart_irq, - .shutdown = shutdown_uart_irq, - .enable = enable_uart_irq, - .disable = disable_uart_irq, - .ack = mask_and_ack_uart_irq, - .end = end_uart_irq, -}; - -void uart_irq_init(void) -{ - /* Reset irq handlers pointers to NULL */ - irq_desc[80].status = IRQ_DISABLED; - irq_desc[80].action = 0; - irq_desc[80].depth = 2; - irq_desc[80].chip = &uart_irq_type; - - irq_desc[81].status = IRQ_DISABLED; - irq_desc[81].action = 0; - irq_desc[81].depth = 2; - irq_desc[81].chip = &uart_irq_type; -} |