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![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)
574 lines
15 KiB
C
574 lines
15 KiB
C
/*
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* FILE NAME
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* drivers/pcmcia/vrc4173_cardu.c
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*
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* BRIEF MODULE DESCRIPTION
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* NEC VRC4173 CARDU driver for Socket Services
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* (This device doesn't support CardBus. it is supporting only 16bit PC Card.)
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*
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* Copyright 2002,2003 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
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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 the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <asm/io.h>
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#include <pcmcia/ss.h>
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#include "vrc4173_cardu.h"
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MODULE_DESCRIPTION("NEC VRC4173 CARDU driver for Socket Services");
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MODULE_AUTHOR("Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>");
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MODULE_LICENSE("GPL");
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static int vrc4173_cardu_slots;
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static vrc4173_socket_t cardu_sockets[CARDU_MAX_SOCKETS];
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extern struct socket_info_t *pcmcia_register_socket (int slot,
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struct pccard_operations *vtable,
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int use_bus_pm);
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extern void pcmcia_unregister_socket(struct socket_info_t *s);
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static inline uint8_t exca_readb(vrc4173_socket_t *socket, uint16_t offset)
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{
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return readb(socket->base + EXCA_REGS_BASE + offset);
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}
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static inline uint16_t exca_readw(vrc4173_socket_t *socket, uint16_t offset)
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{
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uint16_t val;
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val = readb(socket->base + EXCA_REGS_BASE + offset);
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val |= (u16)readb(socket->base + EXCA_REGS_BASE + offset + 1) << 8;
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return val;
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}
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static inline void exca_writeb(vrc4173_socket_t *socket, uint16_t offset, uint8_t val)
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{
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writeb(val, socket->base + EXCA_REGS_BASE + offset);
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}
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static inline void exca_writew(vrc4173_socket_t *socket, uint8_t offset, uint16_t val)
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{
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writeb((u8)val, socket->base + EXCA_REGS_BASE + offset);
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writeb((u8)(val >> 8), socket->base + EXCA_REGS_BASE + offset + 1);
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}
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static inline uint32_t cardbus_socket_readl(vrc4173_socket_t *socket, u16 offset)
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{
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return readl(socket->base + CARDBUS_SOCKET_REGS_BASE + offset);
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}
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static inline void cardbus_socket_writel(vrc4173_socket_t *socket, u16 offset, uint32_t val)
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{
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writel(val, socket->base + CARDBUS_SOCKET_REGS_BASE + offset);
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}
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static void cardu_pciregs_init(struct pci_dev *dev)
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{
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u32 syscnt;
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u16 brgcnt;
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u8 devcnt;
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pci_write_config_dword(dev, 0x1c, 0x10000000);
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pci_write_config_dword(dev, 0x20, 0x17fff000);
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pci_write_config_dword(dev, 0x2c, 0);
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pci_write_config_dword(dev, 0x30, 0xfffc);
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pci_read_config_word(dev, BRGCNT, &brgcnt);
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brgcnt &= ~IREQ_INT;
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pci_write_config_word(dev, BRGCNT, brgcnt);
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pci_read_config_dword(dev, SYSCNT, &syscnt);
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syscnt &= ~(BAD_VCC_REQ_DISB|PCPCI_EN|CH_ASSIGN_MASK|SUB_ID_WR_EN|PCI_CLK_RIN);
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syscnt |= (CH_ASSIGN_NODMA|ASYN_INT_MODE);
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pci_write_config_dword(dev, SYSCNT, syscnt);
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pci_read_config_byte(dev, DEVCNT, &devcnt);
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devcnt &= ~(ZOOM_VIDEO_EN|SR_PCI_INT_SEL_MASK|PCI_INT_MODE|IRQ_MODE);
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devcnt |= (SR_PCI_INT_SEL_NONE|IFG);
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pci_write_config_byte(dev, DEVCNT, devcnt);
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pci_write_config_byte(dev, CHIPCNT, S_PREF_DISB);
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pci_write_config_byte(dev, SERRDIS, 0);
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}
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static int cardu_init(unsigned int slot)
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{
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vrc4173_socket_t *socket = &cardu_sockets[slot];
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cardu_pciregs_init(socket->dev);
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/* CARD_SC bits are cleared by reading CARD_SC. */
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exca_writeb(socket, GLO_CNT, 0);
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socket->cap.features |= SS_CAP_PCCARD | SS_CAP_PAGE_REGS;
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socket->cap.irq_mask = 0;
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socket->cap.map_size = 0x1000;
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socket->cap.pci_irq = socket->dev->irq;
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socket->events = 0;
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spin_lock_init(socket->event_lock);
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/* Enable PC Card status interrupts */
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exca_writeb(socket, CARD_SCI, CARD_DT_EN|RDY_EN|BAT_WAR_EN|BAT_DEAD_EN);
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return 0;
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}
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static int cardu_register_callback(unsigned int sock,
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void (*handler)(void *, unsigned int),
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void * info)
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{
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vrc4173_socket_t *socket = &cardu_sockets[sock];
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socket->handler = handler;
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socket->info = info;
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return 0;
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}
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static int cardu_inquire_socket(unsigned int sock, socket_cap_t *cap)
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{
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vrc4173_socket_t *socket = &cardu_sockets[sock];
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*cap = socket->cap;
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return 0;
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}
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static int cardu_get_status(unsigned int sock, u_int *value)
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{
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vrc4173_socket_t *socket = &cardu_sockets[sock];
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uint32_t state;
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uint8_t status;
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u_int val = 0;
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status = exca_readb(socket, IF_STATUS);
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if (status & CARD_PWR) val |= SS_POWERON;
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if (status & READY) val |= SS_READY;
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if (status & CARD_WP) val |= SS_WRPROT;
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if ((status & (CARD_DETECT1|CARD_DETECT2)) == (CARD_DETECT1|CARD_DETECT2))
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val |= SS_DETECT;
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if (exca_readb(socket, INT_GEN_CNT) & CARD_TYPE_IO) {
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if (status & STSCHG) val |= SS_STSCHG;
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} else {
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status &= BV_DETECT_MASK;
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if (status != BV_DETECT_GOOD) {
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if (status == BV_DETECT_WARN) val |= SS_BATWARN;
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else val |= SS_BATDEAD;
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}
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}
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state = cardbus_socket_readl(socket, SKT_PRE_STATE);
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if (state & VOL_3V_CARD_DT) val |= SS_3VCARD;
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if (state & VOL_XV_CARD_DT) val |= SS_XVCARD;
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if (state & CB_CARD_DT) val |= SS_CARDBUS;
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if (!(state &
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(VOL_YV_CARD_DT|VOL_XV_CARD_DT|VOL_3V_CARD_DT|VOL_5V_CARD_DT|CCD20|CCD10)))
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val |= SS_PENDING;
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*value = val;
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return 0;
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}
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static inline uint8_t set_Vcc_value(u_char Vcc)
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{
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switch (Vcc) {
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case 33:
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return VCC_3V;
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case 50:
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return VCC_5V;
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}
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return VCC_0V;
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}
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static inline uint8_t set_Vpp_value(u_char Vpp)
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{
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switch (Vpp) {
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case 33:
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case 50:
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return VPP_VCC;
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case 120:
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return VPP_12V;
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}
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return VPP_0V;
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}
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static int cardu_set_socket(unsigned int sock, socket_state_t *state)
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{
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vrc4173_socket_t *socket = &cardu_sockets[sock];
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uint8_t val;
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if (((state->Vpp == 33) || (state->Vpp == 50)) && (state->Vpp != state->Vcc))
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return -EINVAL;
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val = set_Vcc_value(state->Vcc);
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val |= set_Vpp_value(state->Vpp);
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if (state->flags & SS_OUTPUT_ENA) val |= CARD_OUT_EN;
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exca_writeb(socket, PWR_CNT, val);
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val = exca_readb(socket, INT_GEN_CNT) & CARD_REST0;
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if (state->flags & SS_RESET) val &= ~CARD_REST0;
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else val |= CARD_REST0;
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if (state->flags & SS_IOCARD) val |= CARD_TYPE_IO;
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exca_writeb(socket, INT_GEN_CNT, val);
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return 0;
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}
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static int cardu_get_io_map(unsigned int sock, struct pccard_io_map *io)
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{
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vrc4173_socket_t *socket = &cardu_sockets[sock];
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uint8_t ioctl, window;
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u_char map;
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map = io->map;
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if (map > 1)
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return -EINVAL;
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io->start = exca_readw(socket, IO_WIN_SA(map));
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io->stop = exca_readw(socket, IO_WIN_EA(map));
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ioctl = exca_readb(socket, IO_WIN_CNT);
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window = exca_readb(socket, ADR_WIN_EN);
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io->flags = (window & IO_WIN_EN(map)) ? MAP_ACTIVE : 0;
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if (ioctl & IO_WIN_DATA_AUTOSZ(map))
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io->flags |= MAP_AUTOSZ;
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else if (ioctl & IO_WIN_DATA_16BIT(map))
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io->flags |= MAP_16BIT;
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return 0;
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}
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static int cardu_set_io_map(unsigned int sock, struct pccard_io_map *io)
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{
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vrc4173_socket_t *socket = &cardu_sockets[sock];
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uint16_t ioctl;
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uint8_t window, enable;
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u_char map;
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map = io->map;
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if (map > 1)
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return -EINVAL;
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window = exca_readb(socket, ADR_WIN_EN);
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enable = IO_WIN_EN(map);
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if (window & enable) {
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window &= ~enable;
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exca_writeb(socket, ADR_WIN_EN, window);
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}
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exca_writew(socket, IO_WIN_SA(map), io->start);
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exca_writew(socket, IO_WIN_EA(map), io->stop);
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ioctl = exca_readb(socket, IO_WIN_CNT) & ~IO_WIN_CNT_MASK(map);
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if (io->flags & MAP_AUTOSZ) ioctl |= IO_WIN_DATA_AUTOSZ(map);
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else if (io->flags & MAP_16BIT) ioctl |= IO_WIN_DATA_16BIT(map);
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exca_writeb(socket, IO_WIN_CNT, ioctl);
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if (io->flags & MAP_ACTIVE)
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exca_writeb(socket, ADR_WIN_EN, window | enable);
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return 0;
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}
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static int cardu_get_mem_map(unsigned int sock, struct pccard_mem_map *mem)
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{
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vrc4173_socket_t *socket = &cardu_sockets[sock];
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uint32_t start, stop, offset, page;
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uint8_t window;
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u_char map;
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map = mem->map;
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if (map > 4)
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return -EINVAL;
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window = exca_readb(socket, ADR_WIN_EN);
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mem->flags = (window & MEM_WIN_EN(map)) ? MAP_ACTIVE : 0;
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start = exca_readw(socket, MEM_WIN_SA(map));
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mem->flags |= (start & MEM_WIN_DSIZE) ? MAP_16BIT : 0;
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start = (start & 0x0fff) << 12;
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stop = exca_readw(socket, MEM_WIN_EA(map));
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stop = ((stop & 0x0fff) << 12) + 0x0fff;
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offset = exca_readw(socket, MEM_WIN_OA(map));
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mem->flags |= (offset & MEM_WIN_WP) ? MAP_WRPROT : 0;
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mem->flags |= (offset & MEM_WIN_REGSET) ? MAP_ATTRIB : 0;
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offset = ((offset & 0x3fff) << 12) + start;
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mem->card_start = offset & 0x03ffffff;
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page = exca_readb(socket, MEM_WIN_SAU(map)) << 24;
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mem->sys_start = start + page;
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mem->sys_stop = start + page;
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return 0;
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}
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static int cardu_set_mem_map(unsigned int sock, struct pccard_mem_map *mem)
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{
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vrc4173_socket_t *socket = &cardu_sockets[sock];
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uint16_t value;
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uint8_t window, enable;
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u_long sys_start, sys_stop, card_start;
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u_char map;
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map = mem->map;
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sys_start = mem->sys_start;
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sys_stop = mem->sys_stop;
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card_start = mem->card_start;
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if (map > 4 || sys_start > sys_stop || ((sys_start ^ sys_stop) >> 24) ||
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(card_start >> 26))
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return -EINVAL;
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window = exca_readb(socket, ADR_WIN_EN);
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enable = MEM_WIN_EN(map);
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if (window & enable) {
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window &= ~enable;
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exca_writeb(socket, ADR_WIN_EN, window);
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}
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exca_writeb(socket, MEM_WIN_SAU(map), sys_start >> 24);
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value = (sys_start >> 12) & 0x0fff;
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if (mem->flags & MAP_16BIT) value |= MEM_WIN_DSIZE;
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exca_writew(socket, MEM_WIN_SA(map), value);
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value = (sys_stop >> 12) & 0x0fff;
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exca_writew(socket, MEM_WIN_EA(map), value);
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value = ((card_start - sys_start) >> 12) & 0x3fff;
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if (mem->flags & MAP_WRPROT) value |= MEM_WIN_WP;
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if (mem->flags & MAP_ATTRIB) value |= MEM_WIN_REGSET;
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exca_writew(socket, MEM_WIN_OA(map), value);
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if (mem->flags & MAP_ACTIVE)
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exca_writeb(socket, ADR_WIN_EN, window | enable);
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return 0;
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}
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static void cardu_proc_setup(unsigned int sock, struct proc_dir_entry *base)
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{
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}
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static struct pccard_operations cardu_operations = {
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.init = cardu_init,
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.register_callback = cardu_register_callback,
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.inquire_socket = cardu_inquire_socket,
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.get_status = cardu_get_status,
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.set_socket = cardu_set_socket,
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.get_io_map = cardu_get_io_map,
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.set_io_map = cardu_set_io_map,
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.get_mem_map = cardu_get_mem_map,
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.set_mem_map = cardu_set_mem_map,
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.proc_setup = cardu_proc_setup,
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};
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static void cardu_bh(void *data)
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{
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vrc4173_socket_t *socket = (vrc4173_socket_t *)data;
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uint16_t events;
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spin_lock_irq(&socket->event_lock);
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events = socket->events;
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socket->events = 0;
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spin_unlock_irq(&socket->event_lock);
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if (socket->handler)
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socket->handler(socket->info, events);
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}
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static uint16_t get_events(vrc4173_socket_t *socket)
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{
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uint16_t events = 0;
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uint8_t csc, status;
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status = exca_readb(socket, IF_STATUS);
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csc = exca_readb(socket, CARD_SC);
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if ((csc & CARD_DT_CHG) &&
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((status & (CARD_DETECT1|CARD_DETECT2)) == (CARD_DETECT1|CARD_DETECT2)))
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events |= SS_DETECT;
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if ((csc & RDY_CHG) && (status & READY))
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events |= SS_READY;
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if (exca_readb(socket, INT_GEN_CNT) & CARD_TYPE_IO) {
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if ((csc & BAT_DEAD_ST_CHG) && (status & STSCHG))
|
|
events |= SS_STSCHG;
|
|
} else {
|
|
if (csc & (BAT_WAR_CHG|BAT_DEAD_ST_CHG)) {
|
|
if ((status & BV_DETECT_MASK) != BV_DETECT_GOOD) {
|
|
if (status == BV_DETECT_WARN) events |= SS_BATWARN;
|
|
else events |= SS_BATDEAD;
|
|
}
|
|
}
|
|
}
|
|
|
|
return events;
|
|
}
|
|
|
|
static void cardu_interrupt(int irq, void *dev_id)
|
|
{
|
|
vrc4173_socket_t *socket = (vrc4173_socket_t *)dev_id;
|
|
uint16_t events;
|
|
|
|
INIT_WORK(&socket->tq_work, cardu_bh, socket);
|
|
|
|
events = get_events(socket);
|
|
if (events) {
|
|
spin_lock(&socket->event_lock);
|
|
socket->events |= events;
|
|
spin_unlock(&socket->event_lock);
|
|
schedule_work(&socket->tq_work);
|
|
}
|
|
}
|
|
|
|
static int __devinit vrc4173_cardu_probe(struct pci_dev *dev,
|
|
const struct pci_device_id *ent)
|
|
{
|
|
vrc4173_socket_t *socket;
|
|
unsigned long start, len, flags;
|
|
int slot, err;
|
|
|
|
slot = vrc4173_cardu_slots++;
|
|
socket = &cardu_sockets[slot];
|
|
if (socket->noprobe != 0)
|
|
return -EBUSY;
|
|
|
|
sprintf(socket->name, "NEC VRC4173 CARDU%1d", slot+1);
|
|
|
|
if ((err = pci_enable_device(dev)) < 0)
|
|
return err;
|
|
|
|
start = pci_resource_start(dev, 0);
|
|
if (start == 0)
|
|
return -ENODEV;
|
|
|
|
len = pci_resource_len(dev, 0);
|
|
if (len == 0)
|
|
return -ENODEV;
|
|
|
|
if (((flags = pci_resource_flags(dev, 0)) & IORESOURCE_MEM) == 0)
|
|
return -EBUSY;
|
|
|
|
if ((err = pci_request_regions(dev, socket->name)) < 0)
|
|
return err;
|
|
|
|
socket->base = ioremap(start, len);
|
|
if (socket->base == NULL)
|
|
return -ENODEV;
|
|
|
|
socket->dev = dev;
|
|
|
|
socket->pcmcia_socket = pcmcia_register_socket(slot, &cardu_operations, 1);
|
|
if (socket->pcmcia_socket == NULL) {
|
|
iounmap(socket->base);
|
|
socket->base = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (request_irq(dev->irq, cardu_interrupt, IRQF_SHARED, socket->name, socket) < 0) {
|
|
pcmcia_unregister_socket(socket->pcmcia_socket);
|
|
socket->pcmcia_socket = NULL;
|
|
iounmap(socket->base);
|
|
socket->base = NULL;
|
|
return -EBUSY;
|
|
}
|
|
|
|
printk(KERN_INFO "%s at %#08lx, IRQ %d\n", socket->name, start, dev->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devinit vrc4173_cardu_setup(char *options)
|
|
{
|
|
if (options == NULL || *options == '\0')
|
|
return 1;
|
|
|
|
if (strncmp(options, "cardu1:", 7) == 0) {
|
|
options += 7;
|
|
if (*options != '\0') {
|
|
if (strncmp(options, "noprobe", 7) == 0) {
|
|
cardu_sockets[CARDU1].noprobe = 1;
|
|
options += 7;
|
|
}
|
|
|
|
if (*options != ',')
|
|
return 1;
|
|
} else
|
|
return 1;
|
|
}
|
|
|
|
if (strncmp(options, "cardu2:", 7) == 0) {
|
|
options += 7;
|
|
if ((*options != '\0') && (strncmp(options, "noprobe", 7) == 0))
|
|
cardu_sockets[CARDU2].noprobe = 1;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
__setup("vrc4173_cardu=", vrc4173_cardu_setup);
|
|
|
|
static struct pci_device_id vrc4173_cardu_id_table[] __devinitdata = {
|
|
{ .vendor = PCI_VENDOR_ID_NEC,
|
|
.device = PCI_DEVICE_ID_NEC_NAPCCARD,
|
|
.subvendor = PCI_ANY_ID,
|
|
.subdevice = PCI_ANY_ID, },
|
|
{0, }
|
|
};
|
|
|
|
static struct pci_driver vrc4173_cardu_driver = {
|
|
.name = "NEC VRC4173 CARDU",
|
|
.probe = vrc4173_cardu_probe,
|
|
.id_table = vrc4173_cardu_id_table,
|
|
};
|
|
|
|
static int __devinit vrc4173_cardu_init(void)
|
|
{
|
|
vrc4173_cardu_slots = 0;
|
|
|
|
return pci_register_driver(&vrc4173_cardu_driver);
|
|
}
|
|
|
|
static void __devexit vrc4173_cardu_exit(void)
|
|
{
|
|
pci_unregister_driver(&vrc4173_cardu_driver);
|
|
}
|
|
|
|
module_init(vrc4173_cardu_init);
|
|
module_exit(vrc4173_cardu_exit);
|
|
MODULE_DEVICE_TABLE(pci, vrc4173_cardu_id_table);
|