![David Howells](/assets/img/avatar_default.png)
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
868 lines
23 KiB
C
868 lines
23 KiB
C
/*
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* Hitachi SCA HD64570 and HD64572 common driver for Linux
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*
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* Copyright (C) 1998-2003 Krzysztof Halasa <khc@pm.waw.pl>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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* Sources of information:
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* Hitachi HD64570 SCA User's Manual
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* Hitachi HD64572 SCA-II User's Manual
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*
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* We use the following SCA memory map:
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*
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* Packet buffer descriptor rings - starting from winbase or win0base:
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* rx_ring_buffers * sizeof(pkt_desc) = logical channel #0 RX ring
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* tx_ring_buffers * sizeof(pkt_desc) = logical channel #0 TX ring
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* rx_ring_buffers * sizeof(pkt_desc) = logical channel #1 RX ring (if used)
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* tx_ring_buffers * sizeof(pkt_desc) = logical channel #1 TX ring (if used)
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*
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* Packet data buffers - starting from winbase + buff_offset:
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* rx_ring_buffers * HDLC_MAX_MRU = logical channel #0 RX buffers
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* tx_ring_buffers * HDLC_MAX_MRU = logical channel #0 TX buffers
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* rx_ring_buffers * HDLC_MAX_MRU = logical channel #0 RX buffers (if used)
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* tx_ring_buffers * HDLC_MAX_MRU = logical channel #0 TX buffers (if used)
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/in.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/bitops.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/hdlc.h>
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#if (!defined (__HD64570_H) && !defined (__HD64572_H)) || \
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(defined (__HD64570_H) && defined (__HD64572_H))
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#error Either hd64570.h or hd64572.h must be included
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#endif
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#define get_msci(port) (phy_node(port) ? MSCI1_OFFSET : MSCI0_OFFSET)
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#define get_dmac_rx(port) (phy_node(port) ? DMAC1RX_OFFSET : DMAC0RX_OFFSET)
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#define get_dmac_tx(port) (phy_node(port) ? DMAC1TX_OFFSET : DMAC0TX_OFFSET)
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#define SCA_INTR_MSCI(node) (node ? 0x10 : 0x01)
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#define SCA_INTR_DMAC_RX(node) (node ? 0x20 : 0x02)
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#define SCA_INTR_DMAC_TX(node) (node ? 0x40 : 0x04)
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#ifdef __HD64570_H /* HD64570 */
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#define sca_outa(value, reg, card) sca_outw(value, reg, card)
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#define sca_ina(reg, card) sca_inw(reg, card)
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#define writea(value, ptr) writew(value, ptr)
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#else /* HD64572 */
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#define sca_outa(value, reg, card) sca_outl(value, reg, card)
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#define sca_ina(reg, card) sca_inl(reg, card)
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#define writea(value, ptr) writel(value, ptr)
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#endif
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static inline struct net_device *port_to_dev(port_t *port)
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{
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return port->dev;
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}
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static inline int sca_intr_status(card_t *card)
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{
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u8 result = 0;
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#ifdef __HD64570_H /* HD64570 */
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u8 isr0 = sca_in(ISR0, card);
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u8 isr1 = sca_in(ISR1, card);
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if (isr1 & 0x03) result |= SCA_INTR_DMAC_RX(0);
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if (isr1 & 0x0C) result |= SCA_INTR_DMAC_TX(0);
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if (isr1 & 0x30) result |= SCA_INTR_DMAC_RX(1);
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if (isr1 & 0xC0) result |= SCA_INTR_DMAC_TX(1);
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if (isr0 & 0x0F) result |= SCA_INTR_MSCI(0);
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if (isr0 & 0xF0) result |= SCA_INTR_MSCI(1);
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#else /* HD64572 */
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u32 isr0 = sca_inl(ISR0, card);
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if (isr0 & 0x0000000F) result |= SCA_INTR_DMAC_RX(0);
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if (isr0 & 0x000000F0) result |= SCA_INTR_DMAC_TX(0);
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if (isr0 & 0x00000F00) result |= SCA_INTR_DMAC_RX(1);
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if (isr0 & 0x0000F000) result |= SCA_INTR_DMAC_TX(1);
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if (isr0 & 0x003E0000) result |= SCA_INTR_MSCI(0);
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if (isr0 & 0x3E000000) result |= SCA_INTR_MSCI(1);
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#endif /* HD64570 vs HD64572 */
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if (!(result & SCA_INTR_DMAC_TX(0)))
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if (sca_in(DSR_TX(0), card) & DSR_EOM)
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result |= SCA_INTR_DMAC_TX(0);
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if (!(result & SCA_INTR_DMAC_TX(1)))
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if (sca_in(DSR_TX(1), card) & DSR_EOM)
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result |= SCA_INTR_DMAC_TX(1);
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return result;
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}
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static inline port_t* dev_to_port(struct net_device *dev)
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{
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return dev_to_hdlc(dev)->priv;
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}
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static inline u16 next_desc(port_t *port, u16 desc, int transmit)
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{
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return (desc + 1) % (transmit ? port_to_card(port)->tx_ring_buffers
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: port_to_card(port)->rx_ring_buffers);
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}
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static inline u16 desc_abs_number(port_t *port, u16 desc, int transmit)
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{
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u16 rx_buffs = port_to_card(port)->rx_ring_buffers;
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u16 tx_buffs = port_to_card(port)->tx_ring_buffers;
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desc %= (transmit ? tx_buffs : rx_buffs); // called with "X + 1" etc.
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return log_node(port) * (rx_buffs + tx_buffs) +
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transmit * rx_buffs + desc;
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}
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static inline u16 desc_offset(port_t *port, u16 desc, int transmit)
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{
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/* Descriptor offset always fits in 16 bytes */
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return desc_abs_number(port, desc, transmit) * sizeof(pkt_desc);
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}
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static inline pkt_desc __iomem *desc_address(port_t *port, u16 desc, int transmit)
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{
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#ifdef PAGE0_ALWAYS_MAPPED
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return (pkt_desc __iomem *)(win0base(port_to_card(port))
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+ desc_offset(port, desc, transmit));
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#else
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return (pkt_desc __iomem *)(winbase(port_to_card(port))
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+ desc_offset(port, desc, transmit));
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#endif
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}
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static inline u32 buffer_offset(port_t *port, u16 desc, int transmit)
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{
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return port_to_card(port)->buff_offset +
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desc_abs_number(port, desc, transmit) * (u32)HDLC_MAX_MRU;
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}
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static inline void sca_set_carrier(port_t *port)
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{
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if (!(sca_in(get_msci(port) + ST3, port_to_card(port)) & ST3_DCD)) {
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#ifdef DEBUG_LINK
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printk(KERN_DEBUG "%s: sca_set_carrier on\n",
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port_to_dev(port)->name);
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#endif
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netif_carrier_on(port_to_dev(port));
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} else {
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#ifdef DEBUG_LINK
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printk(KERN_DEBUG "%s: sca_set_carrier off\n",
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port_to_dev(port)->name);
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#endif
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netif_carrier_off(port_to_dev(port));
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}
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}
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static void sca_init_sync_port(port_t *port)
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{
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card_t *card = port_to_card(port);
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int transmit, i;
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port->rxin = 0;
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port->txin = 0;
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port->txlast = 0;
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#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
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openwin(card, 0);
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#endif
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for (transmit = 0; transmit < 2; transmit++) {
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u16 dmac = transmit ? get_dmac_tx(port) : get_dmac_rx(port);
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u16 buffs = transmit ? card->tx_ring_buffers
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: card->rx_ring_buffers;
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for (i = 0; i < buffs; i++) {
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pkt_desc __iomem *desc = desc_address(port, i, transmit);
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u16 chain_off = desc_offset(port, i + 1, transmit);
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u32 buff_off = buffer_offset(port, i, transmit);
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writea(chain_off, &desc->cp);
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writel(buff_off, &desc->bp);
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writew(0, &desc->len);
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writeb(0, &desc->stat);
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}
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/* DMA disable - to halt state */
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sca_out(0, transmit ? DSR_TX(phy_node(port)) :
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DSR_RX(phy_node(port)), card);
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/* software ABORT - to initial state */
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sca_out(DCR_ABORT, transmit ? DCR_TX(phy_node(port)) :
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DCR_RX(phy_node(port)), card);
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#ifdef __HD64570_H
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sca_out(0, dmac + CPB, card); /* pointer base */
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#endif
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/* current desc addr */
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sca_outa(desc_offset(port, 0, transmit), dmac + CDAL, card);
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if (!transmit)
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sca_outa(desc_offset(port, buffs - 1, transmit),
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dmac + EDAL, card);
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else
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sca_outa(desc_offset(port, 0, transmit), dmac + EDAL,
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card);
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/* clear frame end interrupt counter */
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sca_out(DCR_CLEAR_EOF, transmit ? DCR_TX(phy_node(port)) :
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DCR_RX(phy_node(port)), card);
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if (!transmit) { /* Receive */
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/* set buffer length */
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sca_outw(HDLC_MAX_MRU, dmac + BFLL, card);
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/* Chain mode, Multi-frame */
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sca_out(0x14, DMR_RX(phy_node(port)), card);
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sca_out(DIR_EOME | DIR_BOFE, DIR_RX(phy_node(port)),
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card);
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/* DMA enable */
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sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
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} else { /* Transmit */
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/* Chain mode, Multi-frame */
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sca_out(0x14, DMR_TX(phy_node(port)), card);
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/* enable underflow interrupts */
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sca_out(DIR_BOFE, DIR_TX(phy_node(port)), card);
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}
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}
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sca_set_carrier(port);
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}
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#ifdef NEED_SCA_MSCI_INTR
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/* MSCI interrupt service */
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static inline void sca_msci_intr(port_t *port)
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{
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u16 msci = get_msci(port);
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card_t* card = port_to_card(port);
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u8 stat = sca_in(msci + ST1, card); /* read MSCI ST1 status */
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/* Reset MSCI TX underrun and CDCD status bit */
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sca_out(stat & (ST1_UDRN | ST1_CDCD), msci + ST1, card);
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if (stat & ST1_UDRN) {
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struct net_device_stats *stats = hdlc_stats(port_to_dev(port));
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stats->tx_errors++; /* TX Underrun error detected */
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stats->tx_fifo_errors++;
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}
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if (stat & ST1_CDCD)
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sca_set_carrier(port);
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}
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#endif
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static inline void sca_rx(card_t *card, port_t *port, pkt_desc __iomem *desc, u16 rxin)
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{
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struct net_device *dev = port_to_dev(port);
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struct net_device_stats *stats = hdlc_stats(dev);
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struct sk_buff *skb;
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u16 len;
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u32 buff;
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#ifndef ALL_PAGES_ALWAYS_MAPPED
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u32 maxlen;
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u8 page;
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#endif
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len = readw(&desc->len);
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skb = dev_alloc_skb(len);
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if (!skb) {
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stats->rx_dropped++;
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return;
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}
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buff = buffer_offset(port, rxin, 0);
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#ifndef ALL_PAGES_ALWAYS_MAPPED
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page = buff / winsize(card);
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buff = buff % winsize(card);
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maxlen = winsize(card) - buff;
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openwin(card, page);
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if (len > maxlen) {
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memcpy_fromio(skb->data, winbase(card) + buff, maxlen);
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openwin(card, page + 1);
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memcpy_fromio(skb->data + maxlen, winbase(card), len - maxlen);
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} else
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#endif
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memcpy_fromio(skb->data, winbase(card) + buff, len);
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#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
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/* select pkt_desc table page back */
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openwin(card, 0);
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#endif
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skb_put(skb, len);
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#ifdef DEBUG_PKT
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printk(KERN_DEBUG "%s RX(%i):", dev->name, skb->len);
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debug_frame(skb);
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#endif
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stats->rx_packets++;
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stats->rx_bytes += skb->len;
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dev->last_rx = jiffies;
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skb->protocol = hdlc_type_trans(skb, dev);
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netif_rx(skb);
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}
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/* Receive DMA interrupt service */
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static inline void sca_rx_intr(port_t *port)
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{
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u16 dmac = get_dmac_rx(port);
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card_t *card = port_to_card(port);
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u8 stat = sca_in(DSR_RX(phy_node(port)), card); /* read DMA Status */
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struct net_device_stats *stats = hdlc_stats(port_to_dev(port));
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/* Reset DSR status bits */
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sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
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DSR_RX(phy_node(port)), card);
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if (stat & DSR_BOF)
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stats->rx_over_errors++; /* Dropped one or more frames */
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while (1) {
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u32 desc_off = desc_offset(port, port->rxin, 0);
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pkt_desc __iomem *desc;
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u32 cda = sca_ina(dmac + CDAL, card);
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if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
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break; /* No frame received */
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desc = desc_address(port, port->rxin, 0);
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stat = readb(&desc->stat);
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if (!(stat & ST_RX_EOM))
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port->rxpart = 1; /* partial frame received */
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else if ((stat & ST_ERROR_MASK) || port->rxpart) {
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stats->rx_errors++;
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if (stat & ST_RX_OVERRUN) stats->rx_fifo_errors++;
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else if ((stat & (ST_RX_SHORT | ST_RX_ABORT |
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ST_RX_RESBIT)) || port->rxpart)
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stats->rx_frame_errors++;
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else if (stat & ST_RX_CRC) stats->rx_crc_errors++;
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if (stat & ST_RX_EOM)
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port->rxpart = 0; /* received last fragment */
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} else
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sca_rx(card, port, desc, port->rxin);
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/* Set new error descriptor address */
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sca_outa(desc_off, dmac + EDAL, card);
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port->rxin = next_desc(port, port->rxin, 0);
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}
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/* make sure RX DMA is enabled */
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sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
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}
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/* Transmit DMA interrupt service */
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static inline void sca_tx_intr(port_t *port)
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{
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struct net_device *dev = port_to_dev(port);
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struct net_device_stats *stats = hdlc_stats(dev);
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u16 dmac = get_dmac_tx(port);
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card_t* card = port_to_card(port);
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u8 stat;
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spin_lock(&port->lock);
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stat = sca_in(DSR_TX(phy_node(port)), card); /* read DMA Status */
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/* Reset DSR status bits */
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sca_out((stat & (DSR_EOT | DSR_EOM | DSR_BOF | DSR_COF)) | DSR_DWE,
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DSR_TX(phy_node(port)), card);
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while (1) {
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pkt_desc __iomem *desc;
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u32 desc_off = desc_offset(port, port->txlast, 1);
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u32 cda = sca_ina(dmac + CDAL, card);
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if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
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break; /* Transmitter is/will_be sending this frame */
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desc = desc_address(port, port->txlast, 1);
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stats->tx_packets++;
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stats->tx_bytes += readw(&desc->len);
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writeb(0, &desc->stat); /* Free descriptor */
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port->txlast = next_desc(port, port->txlast, 1);
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}
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|
|
netif_wake_queue(dev);
|
|
spin_unlock(&port->lock);
|
|
}
|
|
|
|
|
|
|
|
static irqreturn_t sca_intr(int irq, void* dev_id)
|
|
{
|
|
card_t *card = dev_id;
|
|
int i;
|
|
u8 stat;
|
|
int handled = 0;
|
|
|
|
#ifndef ALL_PAGES_ALWAYS_MAPPED
|
|
u8 page = sca_get_page(card);
|
|
#endif
|
|
|
|
while((stat = sca_intr_status(card)) != 0) {
|
|
handled = 1;
|
|
for (i = 0; i < 2; i++) {
|
|
port_t *port = get_port(card, i);
|
|
if (port) {
|
|
if (stat & SCA_INTR_MSCI(i))
|
|
sca_msci_intr(port);
|
|
|
|
if (stat & SCA_INTR_DMAC_RX(i))
|
|
sca_rx_intr(port);
|
|
|
|
if (stat & SCA_INTR_DMAC_TX(i))
|
|
sca_tx_intr(port);
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifndef ALL_PAGES_ALWAYS_MAPPED
|
|
openwin(card, page); /* Restore original page */
|
|
#endif
|
|
return IRQ_RETVAL(handled);
|
|
}
|
|
|
|
|
|
|
|
static void sca_set_port(port_t *port)
|
|
{
|
|
card_t* card = port_to_card(port);
|
|
u16 msci = get_msci(port);
|
|
u8 md2 = sca_in(msci + MD2, card);
|
|
unsigned int tmc, br = 10, brv = 1024;
|
|
|
|
|
|
if (port->settings.clock_rate > 0) {
|
|
/* Try lower br for better accuracy*/
|
|
do {
|
|
br--;
|
|
brv >>= 1; /* brv = 2^9 = 512 max in specs */
|
|
|
|
/* Baud Rate = CLOCK_BASE / TMC / 2^BR */
|
|
tmc = CLOCK_BASE / brv / port->settings.clock_rate;
|
|
}while (br > 1 && tmc <= 128);
|
|
|
|
if (tmc < 1) {
|
|
tmc = 1;
|
|
br = 0; /* For baud=CLOCK_BASE we use tmc=1 br=0 */
|
|
brv = 1;
|
|
} else if (tmc > 255)
|
|
tmc = 256; /* tmc=0 means 256 - low baud rates */
|
|
|
|
port->settings.clock_rate = CLOCK_BASE / brv / tmc;
|
|
} else {
|
|
br = 9; /* Minimum clock rate */
|
|
tmc = 256; /* 8bit = 0 */
|
|
port->settings.clock_rate = CLOCK_BASE / (256 * 512);
|
|
}
|
|
|
|
port->rxs = (port->rxs & ~CLK_BRG_MASK) | br;
|
|
port->txs = (port->txs & ~CLK_BRG_MASK) | br;
|
|
port->tmc = tmc;
|
|
|
|
/* baud divisor - time constant*/
|
|
#ifdef __HD64570_H
|
|
sca_out(port->tmc, msci + TMC, card);
|
|
#else
|
|
sca_out(port->tmc, msci + TMCR, card);
|
|
sca_out(port->tmc, msci + TMCT, card);
|
|
#endif
|
|
|
|
/* Set BRG bits */
|
|
sca_out(port->rxs, msci + RXS, card);
|
|
sca_out(port->txs, msci + TXS, card);
|
|
|
|
if (port->settings.loopback)
|
|
md2 |= MD2_LOOPBACK;
|
|
else
|
|
md2 &= ~MD2_LOOPBACK;
|
|
|
|
sca_out(md2, msci + MD2, card);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sca_open(struct net_device *dev)
|
|
{
|
|
port_t *port = dev_to_port(dev);
|
|
card_t* card = port_to_card(port);
|
|
u16 msci = get_msci(port);
|
|
u8 md0, md2;
|
|
|
|
switch(port->encoding) {
|
|
case ENCODING_NRZ: md2 = MD2_NRZ; break;
|
|
case ENCODING_NRZI: md2 = MD2_NRZI; break;
|
|
case ENCODING_FM_MARK: md2 = MD2_FM_MARK; break;
|
|
case ENCODING_FM_SPACE: md2 = MD2_FM_SPACE; break;
|
|
default: md2 = MD2_MANCHESTER;
|
|
}
|
|
|
|
if (port->settings.loopback)
|
|
md2 |= MD2_LOOPBACK;
|
|
|
|
switch(port->parity) {
|
|
case PARITY_CRC16_PR0: md0 = MD0_HDLC | MD0_CRC_16_0; break;
|
|
case PARITY_CRC16_PR1: md0 = MD0_HDLC | MD0_CRC_16; break;
|
|
#ifdef __HD64570_H
|
|
case PARITY_CRC16_PR0_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU_0; break;
|
|
#else
|
|
case PARITY_CRC32_PR1_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU32; break;
|
|
#endif
|
|
case PARITY_CRC16_PR1_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU; break;
|
|
default: md0 = MD0_HDLC | MD0_CRC_NONE;
|
|
}
|
|
|
|
sca_out(CMD_RESET, msci + CMD, card);
|
|
sca_out(md0, msci + MD0, card);
|
|
sca_out(0x00, msci + MD1, card); /* no address field check */
|
|
sca_out(md2, msci + MD2, card);
|
|
sca_out(0x7E, msci + IDL, card); /* flag character 0x7E */
|
|
#ifdef __HD64570_H
|
|
sca_out(CTL_IDLE, msci + CTL, card);
|
|
#else
|
|
/* Skip the rest of underrun frame */
|
|
sca_out(CTL_IDLE | CTL_URCT | CTL_URSKP, msci + CTL, card);
|
|
#endif
|
|
|
|
#ifdef __HD64570_H
|
|
/* Allow at least 8 bytes before requesting RX DMA operation */
|
|
/* TX with higher priority and possibly with shorter transfers */
|
|
sca_out(0x07, msci + RRC, card); /* +1=RXRDY/DMA activation condition*/
|
|
sca_out(0x10, msci + TRC0, card); /* = TXRDY/DMA activation condition*/
|
|
sca_out(0x14, msci + TRC1, card); /* +1=TXRDY/DMA deactiv condition */
|
|
#else
|
|
sca_out(0x0F, msci + RNR, card); /* +1=RX DMA activation condition */
|
|
sca_out(0x3C, msci + TFS, card); /* +1 = TX start */
|
|
sca_out(0x38, msci + TCR, card); /* =Critical TX DMA activ condition */
|
|
sca_out(0x38, msci + TNR0, card); /* =TX DMA activation condition */
|
|
sca_out(0x3F, msci + TNR1, card); /* +1=TX DMA deactivation condition*/
|
|
#endif
|
|
|
|
/* We're using the following interrupts:
|
|
- TXINT (DMAC completed all transmisions, underrun or DCD change)
|
|
- all DMA interrupts
|
|
*/
|
|
|
|
sca_set_carrier(port);
|
|
|
|
#ifdef __HD64570_H
|
|
/* MSCI TX INT and RX INT A IRQ enable */
|
|
sca_out(IE0_TXINT | IE0_RXINTA, msci + IE0, card);
|
|
sca_out(IE1_UDRN | IE1_CDCD, msci + IE1, card);
|
|
sca_out(sca_in(IER0, card) | (phy_node(port) ? 0xC0 : 0x0C),
|
|
IER0, card); /* TXINT and RXINT */
|
|
/* enable DMA IRQ */
|
|
sca_out(sca_in(IER1, card) | (phy_node(port) ? 0xF0 : 0x0F),
|
|
IER1, card);
|
|
#else
|
|
/* MSCI TXINT and RXINTA interrupt enable */
|
|
sca_outl(IE0_TXINT | IE0_RXINTA | IE0_UDRN | IE0_CDCD, msci + IE0,
|
|
card);
|
|
/* DMA & MSCI IRQ enable */
|
|
sca_outl(sca_inl(IER0, card) |
|
|
(phy_node(port) ? 0x0A006600 : 0x000A0066), IER0, card);
|
|
#endif
|
|
|
|
#ifdef __HD64570_H
|
|
sca_out(port->tmc, msci + TMC, card); /* Restore registers */
|
|
#else
|
|
sca_out(port->tmc, msci + TMCR, card);
|
|
sca_out(port->tmc, msci + TMCT, card);
|
|
#endif
|
|
sca_out(port->rxs, msci + RXS, card);
|
|
sca_out(port->txs, msci + TXS, card);
|
|
sca_out(CMD_TX_ENABLE, msci + CMD, card);
|
|
sca_out(CMD_RX_ENABLE, msci + CMD, card);
|
|
|
|
netif_start_queue(dev);
|
|
}
|
|
|
|
|
|
|
|
static void sca_close(struct net_device *dev)
|
|
{
|
|
port_t *port = dev_to_port(dev);
|
|
card_t* card = port_to_card(port);
|
|
|
|
/* reset channel */
|
|
sca_out(CMD_RESET, get_msci(port) + CMD, port_to_card(port));
|
|
#ifdef __HD64570_H
|
|
/* disable MSCI interrupts */
|
|
sca_out(sca_in(IER0, card) & (phy_node(port) ? 0x0F : 0xF0),
|
|
IER0, card);
|
|
/* disable DMA interrupts */
|
|
sca_out(sca_in(IER1, card) & (phy_node(port) ? 0x0F : 0xF0),
|
|
IER1, card);
|
|
#else
|
|
/* disable DMA & MSCI IRQ */
|
|
sca_outl(sca_inl(IER0, card) &
|
|
(phy_node(port) ? 0x00FF00FF : 0xFF00FF00), IER0, card);
|
|
#endif
|
|
netif_stop_queue(dev);
|
|
}
|
|
|
|
|
|
|
|
static int sca_attach(struct net_device *dev, unsigned short encoding,
|
|
unsigned short parity)
|
|
{
|
|
if (encoding != ENCODING_NRZ &&
|
|
encoding != ENCODING_NRZI &&
|
|
encoding != ENCODING_FM_MARK &&
|
|
encoding != ENCODING_FM_SPACE &&
|
|
encoding != ENCODING_MANCHESTER)
|
|
return -EINVAL;
|
|
|
|
if (parity != PARITY_NONE &&
|
|
parity != PARITY_CRC16_PR0 &&
|
|
parity != PARITY_CRC16_PR1 &&
|
|
#ifdef __HD64570_H
|
|
parity != PARITY_CRC16_PR0_CCITT &&
|
|
#else
|
|
parity != PARITY_CRC32_PR1_CCITT &&
|
|
#endif
|
|
parity != PARITY_CRC16_PR1_CCITT)
|
|
return -EINVAL;
|
|
|
|
dev_to_port(dev)->encoding = encoding;
|
|
dev_to_port(dev)->parity = parity;
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
#ifdef DEBUG_RINGS
|
|
static void sca_dump_rings(struct net_device *dev)
|
|
{
|
|
port_t *port = dev_to_port(dev);
|
|
card_t *card = port_to_card(port);
|
|
u16 cnt;
|
|
#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
|
|
u8 page;
|
|
#endif
|
|
|
|
#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
|
|
page = sca_get_page(card);
|
|
openwin(card, 0);
|
|
#endif
|
|
|
|
printk(KERN_DEBUG "RX ring: CDA=%u EDA=%u DSR=%02X in=%u %sactive",
|
|
sca_ina(get_dmac_rx(port) + CDAL, card),
|
|
sca_ina(get_dmac_rx(port) + EDAL, card),
|
|
sca_in(DSR_RX(phy_node(port)), card), port->rxin,
|
|
sca_in(DSR_RX(phy_node(port)), card) & DSR_DE?"":"in");
|
|
for (cnt = 0; cnt < port_to_card(port)->rx_ring_buffers; cnt++)
|
|
printk(" %02X", readb(&(desc_address(port, cnt, 0)->stat)));
|
|
|
|
printk("\n" KERN_DEBUG "TX ring: CDA=%u EDA=%u DSR=%02X in=%u "
|
|
"last=%u %sactive",
|
|
sca_ina(get_dmac_tx(port) + CDAL, card),
|
|
sca_ina(get_dmac_tx(port) + EDAL, card),
|
|
sca_in(DSR_TX(phy_node(port)), card), port->txin, port->txlast,
|
|
sca_in(DSR_TX(phy_node(port)), card) & DSR_DE ? "" : "in");
|
|
|
|
for (cnt = 0; cnt < port_to_card(port)->tx_ring_buffers; cnt++)
|
|
printk(" %02X", readb(&(desc_address(port, cnt, 1)->stat)));
|
|
printk("\n");
|
|
|
|
printk(KERN_DEBUG "MSCI: MD: %02x %02x %02x, "
|
|
"ST: %02x %02x %02x %02x"
|
|
#ifdef __HD64572_H
|
|
" %02x"
|
|
#endif
|
|
", FST: %02x CST: %02x %02x\n",
|
|
sca_in(get_msci(port) + MD0, card),
|
|
sca_in(get_msci(port) + MD1, card),
|
|
sca_in(get_msci(port) + MD2, card),
|
|
sca_in(get_msci(port) + ST0, card),
|
|
sca_in(get_msci(port) + ST1, card),
|
|
sca_in(get_msci(port) + ST2, card),
|
|
sca_in(get_msci(port) + ST3, card),
|
|
#ifdef __HD64572_H
|
|
sca_in(get_msci(port) + ST4, card),
|
|
#endif
|
|
sca_in(get_msci(port) + FST, card),
|
|
sca_in(get_msci(port) + CST0, card),
|
|
sca_in(get_msci(port) + CST1, card));
|
|
|
|
#ifdef __HD64572_H
|
|
printk(KERN_DEBUG "ILAR: %02x ISR: %08x %08x\n", sca_in(ILAR, card),
|
|
sca_inl(ISR0, card), sca_inl(ISR1, card));
|
|
#else
|
|
printk(KERN_DEBUG "ISR: %02x %02x %02x\n", sca_in(ISR0, card),
|
|
sca_in(ISR1, card), sca_in(ISR2, card));
|
|
#endif
|
|
|
|
#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
|
|
openwin(card, page); /* Restore original page */
|
|
#endif
|
|
}
|
|
#endif /* DEBUG_RINGS */
|
|
|
|
|
|
|
|
static int sca_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
port_t *port = dev_to_port(dev);
|
|
card_t *card = port_to_card(port);
|
|
pkt_desc __iomem *desc;
|
|
u32 buff, len;
|
|
#ifndef ALL_PAGES_ALWAYS_MAPPED
|
|
u8 page;
|
|
u32 maxlen;
|
|
#endif
|
|
|
|
spin_lock_irq(&port->lock);
|
|
|
|
desc = desc_address(port, port->txin + 1, 1);
|
|
if (readb(&desc->stat)) { /* allow 1 packet gap */
|
|
/* should never happen - previous xmit should stop queue */
|
|
#ifdef DEBUG_PKT
|
|
printk(KERN_DEBUG "%s: transmitter buffer full\n", dev->name);
|
|
#endif
|
|
netif_stop_queue(dev);
|
|
spin_unlock_irq(&port->lock);
|
|
return 1; /* request packet to be queued */
|
|
}
|
|
|
|
#ifdef DEBUG_PKT
|
|
printk(KERN_DEBUG "%s TX(%i):", dev->name, skb->len);
|
|
debug_frame(skb);
|
|
#endif
|
|
|
|
desc = desc_address(port, port->txin, 1);
|
|
buff = buffer_offset(port, port->txin, 1);
|
|
len = skb->len;
|
|
#ifndef ALL_PAGES_ALWAYS_MAPPED
|
|
page = buff / winsize(card);
|
|
buff = buff % winsize(card);
|
|
maxlen = winsize(card) - buff;
|
|
|
|
openwin(card, page);
|
|
if (len > maxlen) {
|
|
memcpy_toio(winbase(card) + buff, skb->data, maxlen);
|
|
openwin(card, page + 1);
|
|
memcpy_toio(winbase(card), skb->data + maxlen, len - maxlen);
|
|
}
|
|
else
|
|
#endif
|
|
memcpy_toio(winbase(card) + buff, skb->data, len);
|
|
|
|
#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
|
|
openwin(card, 0); /* select pkt_desc table page back */
|
|
#endif
|
|
writew(len, &desc->len);
|
|
writeb(ST_TX_EOM, &desc->stat);
|
|
dev->trans_start = jiffies;
|
|
|
|
port->txin = next_desc(port, port->txin, 1);
|
|
sca_outa(desc_offset(port, port->txin, 1),
|
|
get_dmac_tx(port) + EDAL, card);
|
|
|
|
sca_out(DSR_DE, DSR_TX(phy_node(port)), card); /* Enable TX DMA */
|
|
|
|
desc = desc_address(port, port->txin + 1, 1);
|
|
if (readb(&desc->stat)) /* allow 1 packet gap */
|
|
netif_stop_queue(dev);
|
|
|
|
spin_unlock_irq(&port->lock);
|
|
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
#ifdef NEED_DETECT_RAM
|
|
static u32 __devinit sca_detect_ram(card_t *card, u8 __iomem *rambase, u32 ramsize)
|
|
{
|
|
/* Round RAM size to 32 bits, fill from end to start */
|
|
u32 i = ramsize &= ~3;
|
|
|
|
#ifndef ALL_PAGES_ALWAYS_MAPPED
|
|
u32 size = winsize(card);
|
|
|
|
openwin(card, (i - 4) / size); /* select last window */
|
|
#endif
|
|
do {
|
|
i -= 4;
|
|
#ifndef ALL_PAGES_ALWAYS_MAPPED
|
|
if ((i + 4) % size == 0)
|
|
openwin(card, i / size);
|
|
writel(i ^ 0x12345678, rambase + i % size);
|
|
#else
|
|
writel(i ^ 0x12345678, rambase + i);
|
|
#endif
|
|
}while (i > 0);
|
|
|
|
for (i = 0; i < ramsize ; i += 4) {
|
|
#ifndef ALL_PAGES_ALWAYS_MAPPED
|
|
if (i % size == 0)
|
|
openwin(card, i / size);
|
|
|
|
if (readl(rambase + i % size) != (i ^ 0x12345678))
|
|
break;
|
|
#else
|
|
if (readl(rambase + i) != (i ^ 0x12345678))
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
return i;
|
|
}
|
|
#endif /* NEED_DETECT_RAM */
|
|
|
|
|
|
|
|
static void __devinit sca_init(card_t *card, int wait_states)
|
|
{
|
|
sca_out(wait_states, WCRL, card); /* Wait Control */
|
|
sca_out(wait_states, WCRM, card);
|
|
sca_out(wait_states, WCRH, card);
|
|
|
|
sca_out(0, DMER, card); /* DMA Master disable */
|
|
sca_out(0x03, PCR, card); /* DMA priority */
|
|
sca_out(0, DSR_RX(0), card); /* DMA disable - to halt state */
|
|
sca_out(0, DSR_TX(0), card);
|
|
sca_out(0, DSR_RX(1), card);
|
|
sca_out(0, DSR_TX(1), card);
|
|
sca_out(DMER_DME, DMER, card); /* DMA Master enable */
|
|
}
|