X-Git-Url: http://git.samba.org/samba.git/?p=sfrench%2Fcifs-2.6.git;a=blobdiff_plain;f=arch%2Fsparc64%2Fkernel%2Febus.c;fp=arch%2Fsparc64%2Fkernel%2Febus.c;h=0000000000000000000000000000000000000000;hp=77dbf6d45fafc175e6b602f316cb7ace8a2bb52f;hb=a88b5ba8bd8ac18aad65ee6c6a254e2e74876db3;hpb=d670bd4f803c8b646acd20f3ba21e65458293faf diff --git a/arch/sparc64/kernel/ebus.c b/arch/sparc64/kernel/ebus.c deleted file mode 100644 index 77dbf6d45faf..000000000000 --- a/arch/sparc64/kernel/ebus.c +++ /dev/null @@ -1,257 +0,0 @@ -/* ebus.c: EBUS DMA library code. - * - * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) - * Copyright (C) 1999 David S. Miller (davem@redhat.com) - */ - -#include -#include -#include -#include -#include -#include - -#include -#include - -#define EBDMA_CSR 0x00UL /* Control/Status */ -#define EBDMA_ADDR 0x04UL /* DMA Address */ -#define EBDMA_COUNT 0x08UL /* DMA Count */ - -#define EBDMA_CSR_INT_PEND 0x00000001 -#define EBDMA_CSR_ERR_PEND 0x00000002 -#define EBDMA_CSR_DRAIN 0x00000004 -#define EBDMA_CSR_INT_EN 0x00000010 -#define EBDMA_CSR_RESET 0x00000080 -#define EBDMA_CSR_WRITE 0x00000100 -#define EBDMA_CSR_EN_DMA 0x00000200 -#define EBDMA_CSR_CYC_PEND 0x00000400 -#define EBDMA_CSR_DIAG_RD_DONE 0x00000800 -#define EBDMA_CSR_DIAG_WR_DONE 0x00001000 -#define EBDMA_CSR_EN_CNT 0x00002000 -#define EBDMA_CSR_TC 0x00004000 -#define EBDMA_CSR_DIS_CSR_DRN 0x00010000 -#define EBDMA_CSR_BURST_SZ_MASK 0x000c0000 -#define EBDMA_CSR_BURST_SZ_1 0x00080000 -#define EBDMA_CSR_BURST_SZ_4 0x00000000 -#define EBDMA_CSR_BURST_SZ_8 0x00040000 -#define EBDMA_CSR_BURST_SZ_16 0x000c0000 -#define EBDMA_CSR_DIAG_EN 0x00100000 -#define EBDMA_CSR_DIS_ERR_PEND 0x00400000 -#define EBDMA_CSR_TCI_DIS 0x00800000 -#define EBDMA_CSR_EN_NEXT 0x01000000 -#define EBDMA_CSR_DMA_ON 0x02000000 -#define EBDMA_CSR_A_LOADED 0x04000000 -#define EBDMA_CSR_NA_LOADED 0x08000000 -#define EBDMA_CSR_DEV_ID_MASK 0xf0000000 - -#define EBUS_DMA_RESET_TIMEOUT 10000 - -static void __ebus_dma_reset(struct ebus_dma_info *p, int no_drain) -{ - int i; - u32 val = 0; - - writel(EBDMA_CSR_RESET, p->regs + EBDMA_CSR); - udelay(1); - - if (no_drain) - return; - - for (i = EBUS_DMA_RESET_TIMEOUT; i > 0; i--) { - val = readl(p->regs + EBDMA_CSR); - - if (!(val & (EBDMA_CSR_DRAIN | EBDMA_CSR_CYC_PEND))) - break; - udelay(10); - } -} - -static irqreturn_t ebus_dma_irq(int irq, void *dev_id) -{ - struct ebus_dma_info *p = dev_id; - unsigned long flags; - u32 csr = 0; - - spin_lock_irqsave(&p->lock, flags); - csr = readl(p->regs + EBDMA_CSR); - writel(csr, p->regs + EBDMA_CSR); - spin_unlock_irqrestore(&p->lock, flags); - - if (csr & EBDMA_CSR_ERR_PEND) { - printk(KERN_CRIT "ebus_dma(%s): DMA error!\n", p->name); - p->callback(p, EBUS_DMA_EVENT_ERROR, p->client_cookie); - return IRQ_HANDLED; - } else if (csr & EBDMA_CSR_INT_PEND) { - p->callback(p, - (csr & EBDMA_CSR_TC) ? - EBUS_DMA_EVENT_DMA : EBUS_DMA_EVENT_DEVICE, - p->client_cookie); - return IRQ_HANDLED; - } - - return IRQ_NONE; - -} - -int ebus_dma_register(struct ebus_dma_info *p) -{ - u32 csr; - - if (!p->regs) - return -EINVAL; - if (p->flags & ~(EBUS_DMA_FLAG_USE_EBDMA_HANDLER | - EBUS_DMA_FLAG_TCI_DISABLE)) - return -EINVAL; - if ((p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) && !p->callback) - return -EINVAL; - if (!strlen(p->name)) - return -EINVAL; - - __ebus_dma_reset(p, 1); - - csr = EBDMA_CSR_BURST_SZ_16 | EBDMA_CSR_EN_CNT; - - if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE) - csr |= EBDMA_CSR_TCI_DIS; - - writel(csr, p->regs + EBDMA_CSR); - - return 0; -} -EXPORT_SYMBOL(ebus_dma_register); - -int ebus_dma_irq_enable(struct ebus_dma_info *p, int on) -{ - unsigned long flags; - u32 csr; - - if (on) { - if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) { - if (request_irq(p->irq, ebus_dma_irq, IRQF_SHARED, p->name, p)) - return -EBUSY; - } - - spin_lock_irqsave(&p->lock, flags); - csr = readl(p->regs + EBDMA_CSR); - csr |= EBDMA_CSR_INT_EN; - writel(csr, p->regs + EBDMA_CSR); - spin_unlock_irqrestore(&p->lock, flags); - } else { - spin_lock_irqsave(&p->lock, flags); - csr = readl(p->regs + EBDMA_CSR); - csr &= ~EBDMA_CSR_INT_EN; - writel(csr, p->regs + EBDMA_CSR); - spin_unlock_irqrestore(&p->lock, flags); - - if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) { - free_irq(p->irq, p); - } - } - - return 0; -} -EXPORT_SYMBOL(ebus_dma_irq_enable); - -void ebus_dma_unregister(struct ebus_dma_info *p) -{ - unsigned long flags; - u32 csr; - int irq_on = 0; - - spin_lock_irqsave(&p->lock, flags); - csr = readl(p->regs + EBDMA_CSR); - if (csr & EBDMA_CSR_INT_EN) { - csr &= ~EBDMA_CSR_INT_EN; - writel(csr, p->regs + EBDMA_CSR); - irq_on = 1; - } - spin_unlock_irqrestore(&p->lock, flags); - - if (irq_on) - free_irq(p->irq, p); -} -EXPORT_SYMBOL(ebus_dma_unregister); - -int ebus_dma_request(struct ebus_dma_info *p, dma_addr_t bus_addr, size_t len) -{ - unsigned long flags; - u32 csr; - int err; - - if (len >= (1 << 24)) - return -EINVAL; - - spin_lock_irqsave(&p->lock, flags); - csr = readl(p->regs + EBDMA_CSR); - err = -EINVAL; - if (!(csr & EBDMA_CSR_EN_DMA)) - goto out; - err = -EBUSY; - if (csr & EBDMA_CSR_NA_LOADED) - goto out; - - writel(len, p->regs + EBDMA_COUNT); - writel(bus_addr, p->regs + EBDMA_ADDR); - err = 0; - -out: - spin_unlock_irqrestore(&p->lock, flags); - - return err; -} -EXPORT_SYMBOL(ebus_dma_request); - -void ebus_dma_prepare(struct ebus_dma_info *p, int write) -{ - unsigned long flags; - u32 csr; - - spin_lock_irqsave(&p->lock, flags); - __ebus_dma_reset(p, 0); - - csr = (EBDMA_CSR_INT_EN | - EBDMA_CSR_EN_CNT | - EBDMA_CSR_BURST_SZ_16 | - EBDMA_CSR_EN_NEXT); - - if (write) - csr |= EBDMA_CSR_WRITE; - if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE) - csr |= EBDMA_CSR_TCI_DIS; - - writel(csr, p->regs + EBDMA_CSR); - - spin_unlock_irqrestore(&p->lock, flags); -} -EXPORT_SYMBOL(ebus_dma_prepare); - -unsigned int ebus_dma_residue(struct ebus_dma_info *p) -{ - return readl(p->regs + EBDMA_COUNT); -} -EXPORT_SYMBOL(ebus_dma_residue); - -unsigned int ebus_dma_addr(struct ebus_dma_info *p) -{ - return readl(p->regs + EBDMA_ADDR); -} -EXPORT_SYMBOL(ebus_dma_addr); - -void ebus_dma_enable(struct ebus_dma_info *p, int on) -{ - unsigned long flags; - u32 orig_csr, csr; - - spin_lock_irqsave(&p->lock, flags); - orig_csr = csr = readl(p->regs + EBDMA_CSR); - if (on) - csr |= EBDMA_CSR_EN_DMA; - else - csr &= ~EBDMA_CSR_EN_DMA; - if ((orig_csr & EBDMA_CSR_EN_DMA) != - (csr & EBDMA_CSR_EN_DMA)) - writel(csr, p->regs + EBDMA_CSR); - spin_unlock_irqrestore(&p->lock, flags); -} -EXPORT_SYMBOL(ebus_dma_enable);