![David S. Miller](/assets/img/avatar_default.png)
Everything it contains can be hidden in pci_impl.h Signed-off-by: David S. Miller <davem@davemloft.net>
540 lines
12 KiB
C
540 lines
12 KiB
C
/* $Id: ebus.c,v 1.64 2001/11/08 04:41:33 davem Exp $
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* ebus.c: PCI to EBus bridge device.
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*
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* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
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* Copyright (C) 1999 David S. Miller (davem@redhat.com)
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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/types.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <asm/system.h>
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#include <asm/page.h>
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#include <asm/ebus.h>
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#include <asm/oplib.h>
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#include <asm/prom.h>
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#include <asm/of_device.h>
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#include <asm/bpp.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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/* EBUS dma library. */
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#define EBDMA_CSR 0x00UL /* Control/Status */
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#define EBDMA_ADDR 0x04UL /* DMA Address */
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#define EBDMA_COUNT 0x08UL /* DMA Count */
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#define EBDMA_CSR_INT_PEND 0x00000001
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#define EBDMA_CSR_ERR_PEND 0x00000002
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#define EBDMA_CSR_DRAIN 0x00000004
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#define EBDMA_CSR_INT_EN 0x00000010
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#define EBDMA_CSR_RESET 0x00000080
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#define EBDMA_CSR_WRITE 0x00000100
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#define EBDMA_CSR_EN_DMA 0x00000200
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#define EBDMA_CSR_CYC_PEND 0x00000400
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#define EBDMA_CSR_DIAG_RD_DONE 0x00000800
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#define EBDMA_CSR_DIAG_WR_DONE 0x00001000
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#define EBDMA_CSR_EN_CNT 0x00002000
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#define EBDMA_CSR_TC 0x00004000
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#define EBDMA_CSR_DIS_CSR_DRN 0x00010000
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#define EBDMA_CSR_BURST_SZ_MASK 0x000c0000
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#define EBDMA_CSR_BURST_SZ_1 0x00080000
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#define EBDMA_CSR_BURST_SZ_4 0x00000000
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#define EBDMA_CSR_BURST_SZ_8 0x00040000
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#define EBDMA_CSR_BURST_SZ_16 0x000c0000
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#define EBDMA_CSR_DIAG_EN 0x00100000
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#define EBDMA_CSR_DIS_ERR_PEND 0x00400000
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#define EBDMA_CSR_TCI_DIS 0x00800000
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#define EBDMA_CSR_EN_NEXT 0x01000000
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#define EBDMA_CSR_DMA_ON 0x02000000
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#define EBDMA_CSR_A_LOADED 0x04000000
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#define EBDMA_CSR_NA_LOADED 0x08000000
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#define EBDMA_CSR_DEV_ID_MASK 0xf0000000
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#define EBUS_DMA_RESET_TIMEOUT 10000
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static void __ebus_dma_reset(struct ebus_dma_info *p, int no_drain)
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{
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int i;
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u32 val = 0;
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writel(EBDMA_CSR_RESET, p->regs + EBDMA_CSR);
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udelay(1);
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if (no_drain)
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return;
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for (i = EBUS_DMA_RESET_TIMEOUT; i > 0; i--) {
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val = readl(p->regs + EBDMA_CSR);
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if (!(val & (EBDMA_CSR_DRAIN | EBDMA_CSR_CYC_PEND)))
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break;
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udelay(10);
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}
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}
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static irqreturn_t ebus_dma_irq(int irq, void *dev_id)
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{
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struct ebus_dma_info *p = dev_id;
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unsigned long flags;
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u32 csr = 0;
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spin_lock_irqsave(&p->lock, flags);
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csr = readl(p->regs + EBDMA_CSR);
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writel(csr, p->regs + EBDMA_CSR);
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spin_unlock_irqrestore(&p->lock, flags);
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if (csr & EBDMA_CSR_ERR_PEND) {
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printk(KERN_CRIT "ebus_dma(%s): DMA error!\n", p->name);
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p->callback(p, EBUS_DMA_EVENT_ERROR, p->client_cookie);
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return IRQ_HANDLED;
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} else if (csr & EBDMA_CSR_INT_PEND) {
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p->callback(p,
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(csr & EBDMA_CSR_TC) ?
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EBUS_DMA_EVENT_DMA : EBUS_DMA_EVENT_DEVICE,
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p->client_cookie);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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int ebus_dma_register(struct ebus_dma_info *p)
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{
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u32 csr;
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if (!p->regs)
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return -EINVAL;
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if (p->flags & ~(EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
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EBUS_DMA_FLAG_TCI_DISABLE))
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return -EINVAL;
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if ((p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) && !p->callback)
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return -EINVAL;
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if (!strlen(p->name))
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return -EINVAL;
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__ebus_dma_reset(p, 1);
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csr = EBDMA_CSR_BURST_SZ_16 | EBDMA_CSR_EN_CNT;
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if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
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csr |= EBDMA_CSR_TCI_DIS;
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writel(csr, p->regs + EBDMA_CSR);
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return 0;
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}
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EXPORT_SYMBOL(ebus_dma_register);
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int ebus_dma_irq_enable(struct ebus_dma_info *p, int on)
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{
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unsigned long flags;
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u32 csr;
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if (on) {
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if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
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if (request_irq(p->irq, ebus_dma_irq, IRQF_SHARED, p->name, p))
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return -EBUSY;
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}
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spin_lock_irqsave(&p->lock, flags);
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csr = readl(p->regs + EBDMA_CSR);
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csr |= EBDMA_CSR_INT_EN;
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writel(csr, p->regs + EBDMA_CSR);
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spin_unlock_irqrestore(&p->lock, flags);
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} else {
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spin_lock_irqsave(&p->lock, flags);
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csr = readl(p->regs + EBDMA_CSR);
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csr &= ~EBDMA_CSR_INT_EN;
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writel(csr, p->regs + EBDMA_CSR);
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spin_unlock_irqrestore(&p->lock, flags);
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if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
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free_irq(p->irq, p);
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}
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}
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return 0;
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}
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EXPORT_SYMBOL(ebus_dma_irq_enable);
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void ebus_dma_unregister(struct ebus_dma_info *p)
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{
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unsigned long flags;
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u32 csr;
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int irq_on = 0;
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spin_lock_irqsave(&p->lock, flags);
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csr = readl(p->regs + EBDMA_CSR);
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if (csr & EBDMA_CSR_INT_EN) {
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csr &= ~EBDMA_CSR_INT_EN;
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writel(csr, p->regs + EBDMA_CSR);
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irq_on = 1;
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}
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spin_unlock_irqrestore(&p->lock, flags);
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if (irq_on)
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free_irq(p->irq, p);
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}
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EXPORT_SYMBOL(ebus_dma_unregister);
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int ebus_dma_request(struct ebus_dma_info *p, dma_addr_t bus_addr, size_t len)
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{
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unsigned long flags;
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u32 csr;
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int err;
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if (len >= (1 << 24))
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return -EINVAL;
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spin_lock_irqsave(&p->lock, flags);
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csr = readl(p->regs + EBDMA_CSR);
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err = -EINVAL;
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if (!(csr & EBDMA_CSR_EN_DMA))
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goto out;
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err = -EBUSY;
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if (csr & EBDMA_CSR_NA_LOADED)
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goto out;
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writel(len, p->regs + EBDMA_COUNT);
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writel(bus_addr, p->regs + EBDMA_ADDR);
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err = 0;
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out:
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spin_unlock_irqrestore(&p->lock, flags);
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return err;
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}
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EXPORT_SYMBOL(ebus_dma_request);
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void ebus_dma_prepare(struct ebus_dma_info *p, int write)
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{
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unsigned long flags;
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u32 csr;
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spin_lock_irqsave(&p->lock, flags);
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__ebus_dma_reset(p, 0);
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csr = (EBDMA_CSR_INT_EN |
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EBDMA_CSR_EN_CNT |
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EBDMA_CSR_BURST_SZ_16 |
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EBDMA_CSR_EN_NEXT);
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if (write)
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csr |= EBDMA_CSR_WRITE;
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if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
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csr |= EBDMA_CSR_TCI_DIS;
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writel(csr, p->regs + EBDMA_CSR);
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spin_unlock_irqrestore(&p->lock, flags);
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}
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EXPORT_SYMBOL(ebus_dma_prepare);
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unsigned int ebus_dma_residue(struct ebus_dma_info *p)
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{
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return readl(p->regs + EBDMA_COUNT);
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}
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EXPORT_SYMBOL(ebus_dma_residue);
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unsigned int ebus_dma_addr(struct ebus_dma_info *p)
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{
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return readl(p->regs + EBDMA_ADDR);
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}
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EXPORT_SYMBOL(ebus_dma_addr);
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void ebus_dma_enable(struct ebus_dma_info *p, int on)
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{
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unsigned long flags;
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u32 orig_csr, csr;
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spin_lock_irqsave(&p->lock, flags);
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orig_csr = csr = readl(p->regs + EBDMA_CSR);
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if (on)
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csr |= EBDMA_CSR_EN_DMA;
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else
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csr &= ~EBDMA_CSR_EN_DMA;
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if ((orig_csr & EBDMA_CSR_EN_DMA) !=
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(csr & EBDMA_CSR_EN_DMA))
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writel(csr, p->regs + EBDMA_CSR);
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spin_unlock_irqrestore(&p->lock, flags);
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}
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EXPORT_SYMBOL(ebus_dma_enable);
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struct linux_ebus *ebus_chain = NULL;
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static inline void *ebus_alloc(size_t size)
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{
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void *mem;
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mem = kzalloc(size, GFP_ATOMIC);
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if (!mem)
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panic("ebus_alloc: out of memory");
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return mem;
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}
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static void __init fill_ebus_child(struct device_node *dp,
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struct linux_ebus_child *dev,
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int non_standard_regs)
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{
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struct of_device *op;
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const int *regs;
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int i, len;
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dev->prom_node = dp;
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printk(" (%s)", dp->name);
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regs = of_get_property(dp, "reg", &len);
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if (!regs)
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dev->num_addrs = 0;
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else
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dev->num_addrs = len / sizeof(regs[0]);
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if (non_standard_regs) {
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/* This is to handle reg properties which are not
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* in the parent relative format. One example are
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* children of the i2c device on CompactPCI systems.
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*
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* So, for such devices we just record the property
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* raw in the child resources.
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*/
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for (i = 0; i < dev->num_addrs; i++)
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dev->resource[i].start = regs[i];
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} else {
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for (i = 0; i < dev->num_addrs; i++) {
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int rnum = regs[i];
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if (rnum >= dev->parent->num_addrs) {
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prom_printf("UGH: property for %s was %d, need < %d\n",
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dp->name, len, dev->parent->num_addrs);
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prom_halt();
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}
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dev->resource[i].start = dev->parent->resource[i].start;
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dev->resource[i].end = dev->parent->resource[i].end;
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dev->resource[i].flags = IORESOURCE_MEM;
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dev->resource[i].name = dp->name;
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}
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}
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op = of_find_device_by_node(dp);
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if (!op) {
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dev->num_irqs = 0;
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} else {
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dev->num_irqs = op->num_irqs;
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for (i = 0; i < dev->num_irqs; i++)
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dev->irqs[i] = op->irqs[i];
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}
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if (!dev->num_irqs) {
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/*
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* Oh, well, some PROMs don't export interrupts
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* property to children of EBus devices...
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*
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* Be smart about PS/2 keyboard and mouse.
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*/
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if (!strcmp(dev->parent->prom_node->name, "8042")) {
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if (!strcmp(dev->prom_node->name, "kb_ps2")) {
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dev->num_irqs = 1;
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dev->irqs[0] = dev->parent->irqs[0];
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} else {
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dev->num_irqs = 1;
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dev->irqs[0] = dev->parent->irqs[1];
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}
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}
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}
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}
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static int __init child_regs_nonstandard(struct linux_ebus_device *dev)
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{
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if (!strcmp(dev->prom_node->name, "i2c") ||
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!strcmp(dev->prom_node->name, "SUNW,lombus"))
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return 1;
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return 0;
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}
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static void __init fill_ebus_device(struct device_node *dp, struct linux_ebus_device *dev)
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{
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struct linux_ebus_child *child;
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struct of_device *op;
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int i, len;
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dev->prom_node = dp;
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printk(" [%s", dp->name);
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op = of_find_device_by_node(dp);
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if (!op) {
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dev->num_addrs = 0;
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dev->num_irqs = 0;
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} else {
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(void) of_get_property(dp, "reg", &len);
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dev->num_addrs = len / sizeof(struct linux_prom_registers);
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for (i = 0; i < dev->num_addrs; i++)
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memcpy(&dev->resource[i],
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&op->resource[i],
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sizeof(struct resource));
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dev->num_irqs = op->num_irqs;
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for (i = 0; i < dev->num_irqs; i++)
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dev->irqs[i] = op->irqs[i];
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}
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dev->ofdev.node = dp;
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dev->ofdev.dev.parent = &dev->bus->ofdev.dev;
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dev->ofdev.dev.bus = &ebus_bus_type;
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sprintf(dev->ofdev.dev.bus_id, "ebus[%08x]", dp->node);
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/* Register with core */
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if (of_device_register(&dev->ofdev) != 0)
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printk(KERN_DEBUG "ebus: device registration error for %s!\n",
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dp->path_component_name);
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dp = dp->child;
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if (dp) {
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printk(" ->");
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dev->children = ebus_alloc(sizeof(struct linux_ebus_child));
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child = dev->children;
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child->next = NULL;
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child->parent = dev;
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child->bus = dev->bus;
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fill_ebus_child(dp, child,
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child_regs_nonstandard(dev));
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while ((dp = dp->sibling) != NULL) {
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child->next = ebus_alloc(sizeof(struct linux_ebus_child));
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child = child->next;
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child->next = NULL;
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child->parent = dev;
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child->bus = dev->bus;
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fill_ebus_child(dp, child,
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child_regs_nonstandard(dev));
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}
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}
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printk("]");
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}
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static struct pci_dev *find_next_ebus(struct pci_dev *start, int *is_rio_p)
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{
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struct pci_dev *pdev = start;
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while ((pdev = pci_get_device(PCI_VENDOR_ID_SUN, PCI_ANY_ID, pdev)))
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if (pdev->device == PCI_DEVICE_ID_SUN_EBUS ||
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pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS)
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break;
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*is_rio_p = !!(pdev && (pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS));
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return pdev;
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}
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void __init ebus_init(void)
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{
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struct linux_ebus_device *dev;
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struct linux_ebus *ebus;
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struct pci_dev *pdev;
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struct device_node *dp;
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int is_rio;
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int num_ebus = 0;
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pdev = find_next_ebus(NULL, &is_rio);
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if (!pdev) {
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printk("ebus: No EBus's found.\n");
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return;
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}
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dp = pci_device_to_OF_node(pdev);
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ebus_chain = ebus = ebus_alloc(sizeof(struct linux_ebus));
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ebus->next = NULL;
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ebus->is_rio = is_rio;
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while (dp) {
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struct device_node *child;
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/* SUNW,pci-qfe uses four empty ebuses on it.
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I think we should not consider them here,
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as they have half of the properties this
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code expects and once we do PCI hot-plug,
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we'd have to tweak with the ebus_chain
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in the runtime after initialization. -jj */
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if (!dp->child) {
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pdev = find_next_ebus(pdev, &is_rio);
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if (!pdev) {
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if (ebus == ebus_chain) {
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ebus_chain = NULL;
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printk("ebus: No EBus's found.\n");
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return;
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}
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break;
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}
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ebus->is_rio = is_rio;
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dp = pci_device_to_OF_node(pdev);
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continue;
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}
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printk("ebus%d:", num_ebus);
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ebus->index = num_ebus;
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ebus->prom_node = dp;
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ebus->self = pdev;
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ebus->ofdev.node = dp;
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ebus->ofdev.dev.parent = &pdev->dev;
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ebus->ofdev.dev.bus = &ebus_bus_type;
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sprintf(ebus->ofdev.dev.bus_id, "ebus%d", num_ebus);
|
|
|
|
/* Register with core */
|
|
if (of_device_register(&ebus->ofdev) != 0)
|
|
printk(KERN_DEBUG "ebus: device registration error for %s!\n",
|
|
dp->path_component_name);
|
|
|
|
|
|
child = dp->child;
|
|
if (!child)
|
|
goto next_ebus;
|
|
|
|
ebus->devices = ebus_alloc(sizeof(struct linux_ebus_device));
|
|
|
|
dev = ebus->devices;
|
|
dev->next = NULL;
|
|
dev->children = NULL;
|
|
dev->bus = ebus;
|
|
fill_ebus_device(child, dev);
|
|
|
|
while ((child = child->sibling) != NULL) {
|
|
dev->next = ebus_alloc(sizeof(struct linux_ebus_device));
|
|
|
|
dev = dev->next;
|
|
dev->next = NULL;
|
|
dev->children = NULL;
|
|
dev->bus = ebus;
|
|
fill_ebus_device(child, dev);
|
|
}
|
|
|
|
next_ebus:
|
|
printk("\n");
|
|
|
|
pdev = find_next_ebus(pdev, &is_rio);
|
|
if (!pdev)
|
|
break;
|
|
|
|
dp = pci_device_to_OF_node(pdev);
|
|
|
|
ebus->next = ebus_alloc(sizeof(struct linux_ebus));
|
|
ebus = ebus->next;
|
|
ebus->next = NULL;
|
|
ebus->is_rio = is_rio;
|
|
++num_ebus;
|
|
}
|
|
pci_dev_put(pdev); /* XXX for the case, when ebusnd is 0, is it OK? */
|
|
}
|