![Will Deacon](/assets/img/avatar_default.png)
mmiowb() is now implied by spin_unlock() on architectures that require it, so there is no reason to call it from driver code. This patch was generated using coccinelle: @mmiowb@ @@ - mmiowb(); and invoked as: $ for d in drivers include/linux/qed sound; do \ spatch --include-headers --sp-file mmiowb.cocci --dir $d --in-place; done NOTE: mmiowb() has only ever guaranteed ordering in conjunction with spin_unlock(). However, pairing each mmiowb() removal in this patch with the corresponding call to spin_unlock() is not at all trivial, so there is a small chance that this change may regress any drivers incorrectly relying on mmiowb() to order MMIO writes between CPUs using lock-free synchronisation. If you've ended up bisecting to this commit, you can reintroduce the mmiowb() calls using wmb() instead, which should restore the old behaviour on all architectures other than some esoteric ia64 systems. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
446 lines
11 KiB
C
446 lines
11 KiB
C
/*
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* tifm_7xx1.c - TI FlashMedia driver
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*
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* Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/tifm.h>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#define DRIVER_NAME "tifm_7xx1"
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#define DRIVER_VERSION "0.8"
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#define TIFM_IRQ_ENABLE 0x80000000
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#define TIFM_IRQ_SOCKMASK(x) (x)
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#define TIFM_IRQ_CARDMASK(x) ((x) << 8)
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#define TIFM_IRQ_FIFOMASK(x) ((x) << 16)
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#define TIFM_IRQ_SETALL 0xffffffff
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static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
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struct tifm_dev *sock)
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{
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}
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static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
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{
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unsigned long flags;
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spin_lock_irqsave(&fm->lock, flags);
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fm->socket_change_set |= 1 << sock->socket_id;
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tifm_queue_work(&fm->media_switcher);
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spin_unlock_irqrestore(&fm->lock, flags);
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}
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static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
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{
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struct tifm_adapter *fm = dev_id;
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struct tifm_dev *sock;
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unsigned int irq_status, cnt;
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spin_lock(&fm->lock);
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irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
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if (irq_status == 0 || irq_status == (~0)) {
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spin_unlock(&fm->lock);
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return IRQ_NONE;
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}
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if (irq_status & TIFM_IRQ_ENABLE) {
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writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
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for (cnt = 0; cnt < fm->num_sockets; cnt++) {
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sock = fm->sockets[cnt];
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if (sock) {
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if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))
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sock->data_event(sock);
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if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))
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sock->card_event(sock);
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}
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}
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fm->socket_change_set |= irq_status
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& ((1 << fm->num_sockets) - 1);
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}
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writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
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if (fm->finish_me)
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complete_all(fm->finish_me);
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else if (!fm->socket_change_set)
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writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
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else
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tifm_queue_work(&fm->media_switcher);
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spin_unlock(&fm->lock);
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return IRQ_HANDLED;
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}
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static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)
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{
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unsigned int s_state;
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int cnt;
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writel(0x0e00, sock_addr + SOCK_CONTROL);
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for (cnt = 16; cnt <= 256; cnt <<= 1) {
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if (!(TIFM_SOCK_STATE_POWERED
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& readl(sock_addr + SOCK_PRESENT_STATE)))
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break;
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msleep(cnt);
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}
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s_state = readl(sock_addr + SOCK_PRESENT_STATE);
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if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
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return 0;
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writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
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sock_addr + SOCK_CONTROL);
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/* xd needs some extra time before power on */
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if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)
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== TIFM_TYPE_XD)
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msleep(40);
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writel((s_state & TIFM_CTRL_POWER_MASK) | 0x0c00,
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sock_addr + SOCK_CONTROL);
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/* wait for power to stabilize */
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msleep(20);
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for (cnt = 16; cnt <= 256; cnt <<= 1) {
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if ((TIFM_SOCK_STATE_POWERED
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& readl(sock_addr + SOCK_PRESENT_STATE)))
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break;
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msleep(cnt);
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}
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writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
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sock_addr + SOCK_CONTROL);
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return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
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}
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inline static void tifm_7xx1_sock_power_off(char __iomem *sock_addr)
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{
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writel((~TIFM_CTRL_POWER_MASK) & readl(sock_addr + SOCK_CONTROL),
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sock_addr + SOCK_CONTROL);
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}
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inline static char __iomem *
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tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
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{
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return base_addr + ((sock_num + 1) << 10);
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}
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static void tifm_7xx1_switch_media(struct work_struct *work)
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{
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struct tifm_adapter *fm = container_of(work, struct tifm_adapter,
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media_switcher);
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struct tifm_dev *sock;
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char __iomem *sock_addr;
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unsigned long flags;
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unsigned char media_id;
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unsigned int socket_change_set, cnt;
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spin_lock_irqsave(&fm->lock, flags);
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socket_change_set = fm->socket_change_set;
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fm->socket_change_set = 0;
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dev_dbg(fm->dev.parent, "checking media set %x\n",
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socket_change_set);
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if (!socket_change_set) {
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spin_unlock_irqrestore(&fm->lock, flags);
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return;
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}
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for (cnt = 0; cnt < fm->num_sockets; cnt++) {
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if (!(socket_change_set & (1 << cnt)))
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continue;
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sock = fm->sockets[cnt];
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if (sock) {
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printk(KERN_INFO
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"%s : demand removing card from socket %u:%u\n",
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dev_name(&fm->dev), fm->id, cnt);
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fm->sockets[cnt] = NULL;
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sock_addr = sock->addr;
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spin_unlock_irqrestore(&fm->lock, flags);
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device_unregister(&sock->dev);
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spin_lock_irqsave(&fm->lock, flags);
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tifm_7xx1_sock_power_off(sock_addr);
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writel(0x0e00, sock_addr + SOCK_CONTROL);
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}
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spin_unlock_irqrestore(&fm->lock, flags);
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media_id = tifm_7xx1_toggle_sock_power(
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tifm_7xx1_sock_addr(fm->addr, cnt));
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// tifm_alloc_device will check if media_id is valid
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sock = tifm_alloc_device(fm, cnt, media_id);
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if (sock) {
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sock->addr = tifm_7xx1_sock_addr(fm->addr, cnt);
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if (!device_register(&sock->dev)) {
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spin_lock_irqsave(&fm->lock, flags);
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if (!fm->sockets[cnt]) {
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fm->sockets[cnt] = sock;
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sock = NULL;
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}
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spin_unlock_irqrestore(&fm->lock, flags);
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}
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if (sock)
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tifm_free_device(&sock->dev);
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}
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spin_lock_irqsave(&fm->lock, flags);
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}
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writel(TIFM_IRQ_FIFOMASK(socket_change_set)
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| TIFM_IRQ_CARDMASK(socket_change_set),
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fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
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writel(TIFM_IRQ_FIFOMASK(socket_change_set)
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| TIFM_IRQ_CARDMASK(socket_change_set),
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fm->addr + FM_SET_INTERRUPT_ENABLE);
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writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
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spin_unlock_irqrestore(&fm->lock, flags);
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}
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#ifdef CONFIG_PM
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static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
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{
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struct tifm_adapter *fm = pci_get_drvdata(dev);
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int cnt;
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dev_dbg(&dev->dev, "suspending host\n");
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for (cnt = 0; cnt < fm->num_sockets; cnt++) {
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if (fm->sockets[cnt])
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tifm_7xx1_sock_power_off(fm->sockets[cnt]->addr);
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}
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pci_save_state(dev);
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pci_enable_wake(dev, pci_choose_state(dev, state), 0);
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pci_disable_device(dev);
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pci_set_power_state(dev, pci_choose_state(dev, state));
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return 0;
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}
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static int tifm_7xx1_resume(struct pci_dev *dev)
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{
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struct tifm_adapter *fm = pci_get_drvdata(dev);
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int rc;
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unsigned long timeout;
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unsigned int good_sockets = 0, bad_sockets = 0;
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unsigned long flags;
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/* Maximum number of entries is 4 */
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unsigned char new_ids[4];
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DECLARE_COMPLETION_ONSTACK(finish_resume);
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if (WARN_ON(fm->num_sockets > ARRAY_SIZE(new_ids)))
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return -ENXIO;
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pci_set_power_state(dev, PCI_D0);
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pci_restore_state(dev);
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rc = pci_enable_device(dev);
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if (rc)
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return rc;
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pci_set_master(dev);
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dev_dbg(&dev->dev, "resuming host\n");
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for (rc = 0; rc < fm->num_sockets; rc++)
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new_ids[rc] = tifm_7xx1_toggle_sock_power(
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tifm_7xx1_sock_addr(fm->addr, rc));
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spin_lock_irqsave(&fm->lock, flags);
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for (rc = 0; rc < fm->num_sockets; rc++) {
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if (fm->sockets[rc]) {
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if (fm->sockets[rc]->type == new_ids[rc])
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good_sockets |= 1 << rc;
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else
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bad_sockets |= 1 << rc;
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}
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}
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writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
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fm->addr + FM_SET_INTERRUPT_ENABLE);
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dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
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good_sockets, bad_sockets);
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fm->socket_change_set = 0;
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if (good_sockets) {
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fm->finish_me = &finish_resume;
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spin_unlock_irqrestore(&fm->lock, flags);
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timeout = wait_for_completion_timeout(&finish_resume, HZ);
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dev_dbg(&dev->dev, "wait returned %lu\n", timeout);
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writel(TIFM_IRQ_FIFOMASK(good_sockets)
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| TIFM_IRQ_CARDMASK(good_sockets),
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fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
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writel(TIFM_IRQ_FIFOMASK(good_sockets)
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| TIFM_IRQ_CARDMASK(good_sockets),
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fm->addr + FM_SET_INTERRUPT_ENABLE);
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spin_lock_irqsave(&fm->lock, flags);
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fm->finish_me = NULL;
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fm->socket_change_set ^= good_sockets & fm->socket_change_set;
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}
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fm->socket_change_set |= bad_sockets;
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if (fm->socket_change_set)
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tifm_queue_work(&fm->media_switcher);
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spin_unlock_irqrestore(&fm->lock, flags);
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writel(TIFM_IRQ_ENABLE,
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fm->addr + FM_SET_INTERRUPT_ENABLE);
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return 0;
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}
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#else
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#define tifm_7xx1_suspend NULL
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#define tifm_7xx1_resume NULL
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#endif /* CONFIG_PM */
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static int tifm_7xx1_dummy_has_ms_pif(struct tifm_adapter *fm,
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struct tifm_dev *sock)
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{
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return 0;
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}
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static int tifm_7xx1_has_ms_pif(struct tifm_adapter *fm, struct tifm_dev *sock)
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{
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if (((fm->num_sockets == 4) && (sock->socket_id == 2))
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|| ((fm->num_sockets == 2) && (sock->socket_id == 0)))
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return 1;
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return 0;
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}
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static int tifm_7xx1_probe(struct pci_dev *dev,
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const struct pci_device_id *dev_id)
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{
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struct tifm_adapter *fm;
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int pci_dev_busy = 0;
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int rc;
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rc = pci_set_dma_mask(dev, DMA_BIT_MASK(32));
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if (rc)
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return rc;
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rc = pci_enable_device(dev);
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if (rc)
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return rc;
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pci_set_master(dev);
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rc = pci_request_regions(dev, DRIVER_NAME);
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if (rc) {
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pci_dev_busy = 1;
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goto err_out;
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}
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pci_intx(dev, 1);
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fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
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? 4 : 2, &dev->dev);
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if (!fm) {
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rc = -ENOMEM;
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goto err_out_int;
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}
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INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
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fm->eject = tifm_7xx1_eject;
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fm->has_ms_pif = tifm_7xx1_has_ms_pif;
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pci_set_drvdata(dev, fm);
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fm->addr = pci_ioremap_bar(dev, 0);
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if (!fm->addr) {
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rc = -ENODEV;
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goto err_out_free;
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}
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rc = request_irq(dev->irq, tifm_7xx1_isr, IRQF_SHARED, DRIVER_NAME, fm);
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if (rc)
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goto err_out_unmap;
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rc = tifm_add_adapter(fm);
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if (rc)
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goto err_out_irq;
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writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
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fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
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writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
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fm->addr + FM_SET_INTERRUPT_ENABLE);
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return 0;
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err_out_irq:
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free_irq(dev->irq, fm);
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err_out_unmap:
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iounmap(fm->addr);
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err_out_free:
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tifm_free_adapter(fm);
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err_out_int:
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pci_intx(dev, 0);
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pci_release_regions(dev);
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err_out:
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if (!pci_dev_busy)
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pci_disable_device(dev);
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return rc;
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}
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static void tifm_7xx1_remove(struct pci_dev *dev)
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{
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struct tifm_adapter *fm = pci_get_drvdata(dev);
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int cnt;
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fm->eject = tifm_7xx1_dummy_eject;
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fm->has_ms_pif = tifm_7xx1_dummy_has_ms_pif;
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writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
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free_irq(dev->irq, fm);
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tifm_remove_adapter(fm);
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for (cnt = 0; cnt < fm->num_sockets; cnt++)
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tifm_7xx1_sock_power_off(tifm_7xx1_sock_addr(fm->addr, cnt));
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iounmap(fm->addr);
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pci_intx(dev, 0);
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pci_release_regions(dev);
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pci_disable_device(dev);
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tifm_free_adapter(fm);
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}
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static const struct pci_device_id tifm_7xx1_pci_tbl[] = {
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{ PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
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PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
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{ PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
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PCI_ANY_ID, 0, 0, 0 },
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{ PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
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PCI_ANY_ID, 0, 0, 0 },
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{ }
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};
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static struct pci_driver tifm_7xx1_driver = {
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.name = DRIVER_NAME,
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.id_table = tifm_7xx1_pci_tbl,
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.probe = tifm_7xx1_probe,
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.remove = tifm_7xx1_remove,
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.suspend = tifm_7xx1_suspend,
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.resume = tifm_7xx1_resume,
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};
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module_pci_driver(tifm_7xx1_driver);
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MODULE_AUTHOR("Alex Dubov");
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MODULE_DESCRIPTION("TI FlashMedia host driver");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
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MODULE_VERSION(DRIVER_VERSION);
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