Feng Kan wrote:
Signed-off-by: Feng Kan <fkan@xxxxxxxx>
Signed-off-by: Mark Miesfeld <miesfeld@xxxxxxxxx>
---
drivers/ata/Kconfig | 10 +
drivers/ata/Makefile | 1 +
drivers/ata/sata_dwc.c | 2053 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 2064 insertions(+), 0 deletions(-)
create mode 100644 drivers/ata/sata_dwc.c
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 0bcf264..c3d0b24 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -72,6 +72,16 @@ config SATA_FSL
If unsure, say N.
+config SATA_DWC
+ tristate "DesignWare Cores SATA support"
+ depends on 460EX
+ help
+ This option enables support for the Synopsys DesignWare Cores SATA
+ controller.
+ It can be found on the AMCC 460EX.
+
+ If unsure, say N.
+
config ATA_SFF
bool "ATA SFF support"
default y
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 7f1ecf9..3d41fc7 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_SATA_MV) += sata_mv.o
obj-$(CONFIG_SATA_INIC162X) += sata_inic162x.o
obj-$(CONFIG_PDC_ADMA) += pdc_adma.o
obj-$(CONFIG_SATA_FSL) += sata_fsl.o
+obj-$(CONFIG_SATA_DWC) += sata_dwc.o
obj-$(CONFIG_PATA_ALI) += pata_ali.o
obj-$(CONFIG_PATA_AMD) += pata_amd.o
diff --git a/drivers/ata/sata_dwc.c b/drivers/ata/sata_dwc.c
new file mode 100644
index 0000000..672f91f
--- /dev/null
+++ b/drivers/ata/sata_dwc.c
@@ -0,0 +1,2053 @@
+/*
+ * drivers/ata/sata_dwc.c
+ *
+ * Synopsys DesignWare Cores (DWC) SATA host driver
+ *
+ * Author: Mark Miesfeld <mmiesfeld@xxxxxxxx>
+ *
+ * Ported from 2.6.19.2 to 2.6.25/26 by Stefan Roese <sr@xxxxxxx>
+ * Copyright 2008 DENX Software Engineering
+ *
+ * Based on versions provided by AMCC and Synopsys which are:
+ * Copyright 2006 Applied Micro Circuits Corporation
+ * COPYRIGHT (C) 2005 SYNOPSYS, INC. ALL RIGHTS RESERVED
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+#ifdef CONFIG_SATA_DWC_DEBUG
+#define DEBUG
+#endif
+
+#ifdef CONFIG_SATA_DWC_VDEBUG
+#define VERBOSE_DEBUG
+#define DEBUG_NCQ
+#endif
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/libata.h>
+
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+
+#define DRV_NAME "sata-dwc"
+#define DRV_VERSION "1.0"
+
+/* SATA DMA driver Globals */
+#define DMA_NUM_CHANS 1
+#define DMA_NUM_CHAN_REGS 8
+
+/* SATA DMA Register definitions */
+#define AHB_DMA_BRST_DFLT 64 /* 16 data items burst length */
+
+struct dmareg {
+ u32 low; /* Low bits 0-31 */
+ u32 high; /* High bits 32-63 */
+};
+
+/* DMA Per Channel registers */
+
+struct dma_chan_regs {
+ struct dmareg sar; /* Source Address */
+ struct dmareg dar; /* Destination address */
+ struct dmareg llp; /* Linked List Pointer */
+ struct dmareg ctl; /* Control */
+ struct dmareg sstat; /* Source Status not implemented in core */
+ struct dmareg dstat; /* Destination Status not implemented in core */
+ struct dmareg sstatar; /* Source Status Address not impl in core */
+ struct dmareg dstatar; /* Destination Status Address not implemented */
+ struct dmareg cfg; /* Config */
+ struct dmareg sgr; /* Source Gather */
+ struct dmareg dsr; /* Destination Scatter */
+};
+
+/* Generic Interrupt Registers */
+struct dma_interrupt_regs {
+ struct dmareg tfr; /* Transfer Interrupt */
+ struct dmareg block; /* Block Interrupt */
+ struct dmareg srctran; /* Source Transfer Interrupt */
+ struct dmareg dsttran; /* Dest Transfer Interrupt */
+ struct dmareg error; /* Error */
+};
+
+struct ahb_dma_regs {
+ struct dma_chan_regs chan_regs[DMA_NUM_CHAN_REGS];
+ struct dma_interrupt_regs interrupt_raw; /* Raw Interrupt */
+ struct dma_interrupt_regs interrupt_status; /* Interrupt Status */
+ struct dma_interrupt_regs interrupt_mask; /* Interrupt Mask */
+ struct dma_interrupt_regs interrupt_clear; /* Interrupt Clear */
+ struct dmareg statusInt; /* Interrupt combined */
+ struct dmareg rq_srcreg; /* Src Trans Req */
+ struct dmareg rq_dstreg; /* Dst Trans Req */
+ struct dmareg rq_sgl_srcreg; /* Sngl Src Trans Req */
+ struct dmareg rq_sgl_dstreg; /* Sngl Dst Trans Req */
+ struct dmareg rq_lst_srcreg; /* Last Src Trans Req */
+ struct dmareg rq_lst_dstreg; /* Last Dst Trans Req */
+ struct dmareg dma_cfg; /* DMA Config */
+ struct dmareg dma_chan_en; /* DMA Channel Enable */
+ struct dmareg dma_id; /* DMA ID */
+ struct dmareg dma_test; /* DMA Test */
+ struct dmareg res1; /* reserved */
+ struct dmareg res2; /* reserved */
+
+ /* DMA Comp Params
+ * Param 6 = dma_param[0], Param 5 = dma_param[1],
+ * Param 4 = dma_param[2] ...
+ */
+ struct dmareg dma_params[6];
+};
+
+/* Data structure for linked list item */
+struct lli {
+ u32 sar; /* Source Address */
+ u32 dar; /* Destination address */
+ u32 llp; /* Linked List Pointer */
+ struct dmareg ctl; /* Control */
+ struct dmareg dstat; /* Destination Status */
+};
+
+#define SATA_DWC_DMAC_LLI_SZ (sizeof(struct lli))
+#define SATA_DWC_DMAC_LLI_NUM 256
+#define SATA_DWC_DMAC_TWIDTH_BYTES 4
+#define SATA_DWC_DMAC_LLI_TBL_SZ \
+ (SATA_DWC_DMAC_LLI_SZ * SATA_DWC_DMAC_LLI_NUM)
+#define SATA_DWC_DMAC_CTRL_TSIZE_MAX \
+ (0x00000800 * SATA_DWC_DMAC_TWIDTH_BYTES)
+
+/* DMA Register Operation Bits */
+#define DMA_EN 0x00000001 /* Enable AHB DMA */
+#define DMA_CHANNEL(ch) (0x00000001 << (ch)) /* Select channel */
+#define DMA_ENABLE_CHAN(ch) ((0x00000001 << (ch)) | \
+ ((0x000000001 << (ch)) << 8))
+#define DMA_DISABLE_CHAN(ch) (0x00000000 | ((0x000000001 << (ch)) << 8))
+
+/* Channel Control Register */
+#define DMA_CTL_BLK_TS(size) ((size) & 0x000000FFF) /* Blk Transfer size */
+#define DMA_CTL_LLP_SRCEN 0x10000000 /* Blk chain enable Src */
+#define DMA_CTL_LLP_DSTEN 0x08000000 /* Blk chain enable Dst */
+/*
+ * This define is used to set block chaining disabled in the control low
+ * register. It is already in little endian format so it can be &'d dirctly.
+ * It is essentially: cpu_to_le32(~(DMA_CTL_LLP_SRCEN | DMA_CTL_LLP_DSTEN))
+ */
+#define DMA_CTL_LLP_DISABLE_LE32 0xffffffe7
+#define DMA_CTL_SMS(num) ((num & 0x3) << 25) /*Src Master Select*/
+#define DMA_CTL_DMS(num) ((num & 0x3) << 23) /*Dst Master Select*/
+#define DMA_CTL_TTFC(type) ((type & 0x7) << 20) /*Type&Flow cntr*/
+#define DMA_CTL_TTFC_P2M_DMAC 0x00000002 /*Per mem,DMAC cntr*/
+#define DMA_CTL_TTFC_M2P_PER 0x00000003 /*Mem per,peri cntr*/
+#define DMA_CTL_SRC_MSIZE(size) ((size & 0x7) << 14) /*Src Burst Len*/
+#define DMA_CTL_DST_MSIZE(size) ((size & 0x7) << 11) /*Dst Burst Len*/
+#define DMA_CTL_SINC_INC 0x00000000 /*Src addr incr*/
+#define DMA_CTL_SINC_DEC 0x00000200
+#define DMA_CTL_SINC_NOCHANGE 0x00000400
+#define DMA_CTL_DINC_INC 0x00000000 /*Dst addr incr*/
+#define DMA_CTL_DINC_DEC 0x00000080
+#define DMA_CTL_DINC_NOCHANGE 0x00000100
+#define DMA_CTL_SRC_TRWID(size) ((size & 0x7) << 4) /*Src Trnsfr Width*/
+#define DMA_CTL_DST_TRWID(size) ((size & 0x7) << 1) /*Dst Trnsfr Width*/
+#define DMA_CTL_INT_EN 0x00000001 /*Interrupt Enable*/
+
+/* Channel Configuration Register high bits */
+#define DMA_CFG_FCMOD_REQ 0x00000001 /*Flow cntrl req*/
+#define DMA_CFG_PROTCTL (0x00000003 << 2) /*Protection cntrl*/
+
+/* Channel Configuration Register low bits */
+#define DMA_CFG_RELD_DST 0x80000000 /*Reload Dst/Src Addr*/
+#define DMA_CFG_RELD_SRC 0x40000000
+#define DMA_CFG_HS_SELSRC 0x00000800 /*SW hndshk Src/Dst*/
+#define DMA_CFG_HS_SELDST 0x00000400
+#define DMA_CFG_FIFOEMPTY (0x00000001 << 9) /*FIFO Empty bit*/
+
+/* Assign hardware handshaking interface (x) to dst / sre peripheral */
+#define DMA_CFG_HW_HS_DEST(int_num) ((int_num & 0xF) << 11)
+#define DMA_CFG_HW_HS_SRC(int_num) ((int_num & 0xF) << 7)
+
+/* Channel Linked List Pointer Register */
+#define DMA_LLP_LMS(addr, master) (((addr) & 0xfffffffc) | (master))
+#define DMA_LLP_AHBMASTER1 0 /* List Master Select */
+#define DMA_LLP_AHBMASTER2 1
+
+#define SATA_DWC_MAX_PORTS 1
+
+#define SATA_DWC_SCR_OFFSET 0x24
+#define SATA_DWC_REG_OFFSET 0x64
Use 'enum' rather than pre-processor #defines, for creating constants,
as we do in the rest of libata. This gives more debugger and compiler
symbol visibility, and makes pre-processed source much easier to read.
+/* DWC SATA Registers */
+struct sata_dwc_regs {
+ u32 fptagr; /* 1st party DMA tag */
+ u32 fpbor; /* 1st party DMA buffer offset */
+ u32 fptcr; /* 1st party DMA Xfr count */
+ u32 dmacr; /* DMA Control */
+ u32 dbtsr; /* DMA Burst Transac size */
+ u32 intpr; /* Interrupt Pending */
+ u32 intmr; /* Interrupt Mask */
+ u32 errmr; /* Error Mask */
+ u32 llcr; /* Link Layer Control */
+ u32 phycr; /* PHY Control */
+ u32 physr; /* PHY Status */
+ u32 rxbistpd; /* Recvd BIST pattern def register */
+ u32 rxbistpd1; /* Recvd BIST data dword1 */
+ u32 rxbistpd2; /* Recvd BIST pattern data dword2 */
+ u32 txbistpd; /* Trans BIST pattern def register */
+ u32 txbistpd1; /* Trans BIST data dword1 */
+ u32 txbistpd2; /* Trans BIST data dword2 */
+ u32 bistcr; /* BIST Control Register */
+ u32 bistfctr; /* BIST FIS Count Register */
+ u32 bistsr; /* BIST Status Register */
+ u32 bistdecr; /* BIST Dword Error count register */
+ u32 res[15]; /* Reserved locations */
+ u32 testr; /* Test Register */
+ u32 versionr; /* Version Register */
+ u32 idr; /* ID Register */
+ u32 unimpl[192]; /* Unimplemented */
+ u32 dmadr[256]; /* FIFO Locations in DMA Mode */
+};
+
+#define SCR_SCONTROL_DET_ENABLE 0x00000001
+#define SCR_SSTATUS_DET_PRESENT 0x00000001
+#define SCR_SERROR_DIAG_X 0x04000000
+
+/* DWC SATA Register Operations */
+#define SATA_DWC_TXFIFO_DEPTH 0x01FF
+#define SATA_DWC_RXFIFO_DEPTH 0x01FF
+
+#define SATA_DWC_DMACR_TMOD_TXCHEN 0x00000004
+#define SATA_DWC_DMACR_TXCHEN (0x00000001 | \
+ SATA_DWC_DMACR_TMOD_TXCHEN)
+#define SATA_DWC_DMACR_RXCHEN (0x00000002 | \
+ SATA_DWC_DMACR_TMOD_TXCHEN)
+#define SATA_DWC_DMACR_TX_CLEAR(v) (((v) & ~SATA_DWC_DMACR_TXCHEN) | \
+ SATA_DWC_DMACR_TMOD_TXCHEN)
+#define SATA_DWC_DMACR_RX_CLEAR(v) (((v) & ~SATA_DWC_DMACR_RXCHEN) | \
+ SATA_DWC_DMACR_TMOD_TXCHEN)
+#define SATA_DWC_DMACR_TXRXCH_CLEAR SATA_DWC_DMACR_TMOD_TXCHEN
+
+#define SATA_DWC_DBTSR_MWR(size) ((size/4) & \
+ SATA_DWC_TXFIFO_DEPTH)
+#define SATA_DWC_DBTSR_MRD(size) (((size/4) & \
+ SATA_DWC_RXFIFO_DEPTH) << 16)
+#define SATA_DWC_INTPR_DMAT 0x00000001
+#define SATA_DWC_INTPR_NEWFP 0x00000002
+#define SATA_DWC_INTPR_PMABRT 0x00000004
+#define SATA_DWC_INTPR_ERR 0x00000008
+#define SATA_DWC_INTPR_NEWBIST 0x00000010
+#define SATA_DWC_INTPR_IPF 0x10000000
+#define SATA_DWC_INTMR_DMATM 0x00000001
+#define SATA_DWC_INTMR_NEWFPM 0x00000002
+#define SATA_DWC_INTMR_PMABRTM 0x00000004
+#define SATA_DWC_INTMR_ERRM 0x00000008
+#define SATA_DWC_INTMR_NEWBISTM 0x00000010
+#define SATA_DWC_LLCR_SCRAMEN 0x00000001
+#define SATA_DWC_LLCR_DESCRAMEN 0x00000002
+#define SATA_DWC_LLCR_RPDEN 0x00000004
ditto
+struct sata_dwc_device {
+ struct device *dev; /* generic device struct */
+ struct ata_probe_ent *pe; /* ptr to probe-ent */
+ struct ata_host *host;
+ u8 *reg_base;
+ struct sata_dwc_regs *sata_dwc_regs; /* DW Synopsys SATA specific */
+ int irq_dma;
+};
I think this is missing __iomem notations and 'sparse' checks
(Documentation/sparse.txt)
+ */
+static u32 sata_dwc_sactive_issued; /* issued queued ops */
+static u32 sata_dwc_sactive_queued; /* queued ops */
+static struct ahb_dma_regs *sata_dma_regs;
+static u32 dma_interrupt_count;
+static void *scr_addr_sstatus;
+static struct device *dwc_dev;
create a host-private struct, do not use global variables.
Global variables are discouraged because they create a barrier to
supporting multiple controller instances in a single driver -- and also
because people look at existing driver code for examples, and this
creates a poor example
+static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag);
+static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc,
+ u32 check_status);
+static void sata_dwc_dma_xfer_complete(struct ata_port *ap, u32 check_status);
+static void sata_dwc_port_stop(struct ata_port *ap);
+static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag);
+
+static int dma_dwc_init(struct sata_dwc_device *hsdev, struct resource *res,
+ int irq);
+static void dma_dwc_exit(struct sata_dwc_device *hsdev);
+static int dma_dwc_xfer_setup(struct scatterlist *sg, int num_elems,
+ struct lli *lli, dma_addr_t dma_lli,
+ void __iomem *addr, int dir);
+static void dma_dwc_xfer_start(int dma_ch);
+static void dma_dwc_terminate_dma(int dma_ch);
+
+static const char *dir_2_txt(enum dma_data_direction dir)
+{
+ switch (dir) {
+ case DMA_BIDIRECTIONAL:
+ return "bi";
+ case DMA_FROM_DEVICE:
+ return "from";
+ case DMA_TO_DEVICE:
+ return "to";
+ case DMA_NONE:
+ return "none";
+ default:
+ return "err";
+ }
+}
+
+static const char *prot_2_txt(enum ata_tf_protocols protocol)
+{
+ switch (protocol) {
+ case ATA_PROT_UNKNOWN:
+ return "unknown";
+ case ATA_PROT_NODATA:
+ return "nodata";
+ case ATA_PROT_PIO:
+ return "pio";
+ case ATA_PROT_DMA:
+ return "dma";
+ case ATA_PROT_NCQ:
+ return "ncq";
+ case ATAPI_PROT_PIO:
+ return "atapi pio";
+ case ATAPI_PROT_NODATA:
+ return "atapi nodata";
+ case ATAPI_PROT_DMA:
+ return "atapi dma";
+ default:
+ return "err";
+ }
+}
+
+inline const char *ata_cmd_2_txt(const struct ata_taskfile *tf)
+{
+ switch (tf->command) {
+ case ATA_CMD_CHK_POWER:
+ return "ATA_CMD_CHK_POWER";
+ case ATA_CMD_EDD:
+ return "ATA_CMD_EDD";
+ case ATA_CMD_FLUSH:
+ return "ATA_CMD_FLUSH";
+ case ATA_CMD_FLUSH_EXT:
+ return "ATA_CMD_FLUSH_EXT";
+ case ATA_CMD_ID_ATA:
+ return "ATA_CMD_ID_ATA";
+ case ATA_CMD_ID_ATAPI:
+ return "ATA_CMD_ID_ATAPI";
+ case ATA_CMD_FPDMA_READ:
+ return "ATA_CMD_FPDMA_READ";
+ case ATA_CMD_FPDMA_WRITE:
+ return "ATA_CMD_FPDMA_WRITE";
+ case ATA_CMD_READ:
+ return "ATA_CMD_READ";
+ case ATA_CMD_READ_EXT:
+ return "ATA_CMD_READ_EXT";
+ case ATA_CMD_WRITE:
+ return "ATA_CMD_WRITE";
+ case ATA_CMD_WRITE_EXT:
+ return "ATA_CMD_WRITE_EXT";
+ case ATA_CMD_PIO_READ:
+ return "ATA_CMD_PIO_READ";
+ case ATA_CMD_PIO_READ_EXT:
+ return "ATA_CMD_PIO_READ_EXT";
+ case ATA_CMD_PIO_WRITE:
+ return "ATA_CMD_PIO_WRITE";
+ case ATA_CMD_PIO_WRITE_EXT:
+ return "ATA_CMD_PIO_WRITE_EXT";
+ case ATA_CMD_SET_FEATURES:
+ return "ATA_CMD_SET_FEATURES";
+ case ATA_CMD_PACKET:
+ return "ATA_CMD_PACKET";
+ default:
+ return "ATA_CMD_???";
libata already has debugging facilties. we don't need this generic dump
stuff in a specific driver.
+static void sata_dwc_tf_dump(struct ata_taskfile *tf)
+{
+ dev_vdbg(dwc_dev, "taskfile cmd: 0x%02x protocol: %s flags: 0x%lx"
+ "device: %x\n", tf->command, prot_2_txt(tf->protocol),
+ tf->flags, tf->device);
+ dev_vdbg(dwc_dev, "feature: 0x%02x nsect: 0x%x lbal: 0x%x lbam:"
+ "0x%x lbah: 0x%x\n", tf->feature, tf->nsect, tf->lbal,
+ tf->lbam, tf->lbah);
+ dev_vdbg(dwc_dev, "hob_feature: 0x%02x hob_nsect: 0x%x hob_lbal: 0x%x "
+ "hob_lbam: 0x%x hob_lbah: 0x%x\n", tf->hob_feature,
+ tf->hob_nsect, tf->hob_lbal, tf->hob_lbam,
+ tf->hob_lbah);
ditto
+ * Function: get_burst_length_encode
+ * arguments: datalength: length in bytes of data
+ * returns value to be programmed in register corrresponding to data length
+ * This value is effectively the log(base 2) of the length
+ */
+static inline int get_burst_length_encode(int datalength)
+{
+ int items = datalength >> 2; /* div by 4 to get lword count */
+
+ if (items >= 64)
+ return 5;
+
+ if (items >= 32)
+ return 4;
+
+ if (items >= 16)
+ return 3;
+
+ if (items >= 8)
+ return 2;
+
+ if (items >= 4)
+ return 1;
+
+ return 0;
+}
+
+static inline void clear_chan_interrupts(int c)
+{
+ out_le32(&(sata_dma_regs->interrupt_clear.tfr.low), DMA_CHANNEL(c));
+ out_le32(&(sata_dma_regs->interrupt_clear.block.low), DMA_CHANNEL(c));
+ out_le32(&(sata_dma_regs->interrupt_clear.srctran.low), DMA_CHANNEL(c));
+ out_le32(&(sata_dma_regs->interrupt_clear.dsttran.low), DMA_CHANNEL(c));
+ out_le32(&(sata_dma_regs->interrupt_clear.error.low), DMA_CHANNEL(c));
+}
+
+/*
+ * Function: dma_request_channel
+ * arguments: None
+ * returns channel number if available else -1
+ * This function assigns the next available DMA channel from the list to the
+ * requester
+ */
+static int dma_request_channel(void)
+{
+ int i;
+ struct ahb_dma_regs *pdma;
+
+ pdma = sata_dma_regs;
+ for (i = 0; i < DMA_NUM_CHANS; i++) {
+ if (!(in_le32(&(pdma->dma_chan_en.low)) & DMA_CHANNEL(i)))
+ return i;
+ }
+
+ dev_err(dwc_dev, "%s NO channel chan_en: 0x%08x\n", __func__,
+ in_le32(&(pdma->dma_chan_en.low)));
+
+ return -1;
+}
+
+/*
+ * Function: dma_dwc_interrupt
+ * arguments: irq, dev_id, pt_regs
+ * returns channel number if available else -1
+ * Interrupt Handler for DW AHB SATA DMA
+ */
+static irqreturn_t dma_dwc_interrupt(int irq, void *hsdev_instance)
+{
+ int chan;
+ u32 tfr_reg, err_reg;
+ unsigned long flags;
+ struct sata_dwc_device *hsdev =
+ (struct sata_dwc_device *)hsdev_instance;
+ struct ata_host *host = (struct ata_host *)hsdev->host;
+ struct ata_port *ap;
+ struct sata_dwc_device_port *hsdevp;
+ u8 tag = 0;
+ unsigned int port = 0;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ ap = host->ports[port];
+ hsdevp = HSDEVP_FROM_AP(ap);
+ tag = ap->link.active_tag;
+
+ tfr_reg = in_le32(&(sata_dma_regs->interrupt_status.tfr.low));
+ err_reg = in_le32(&(sata_dma_regs->interrupt_status.error.low));
+
+ dev_dbg(ap->dev, "eot=0x%08x err=0x%08x pending=%d active port=%d\n",
+ tfr_reg, err_reg, hsdevp->dma_pending[tag], port);
+
+ for (chan = 0; chan < DMA_NUM_CHANS; chan++) {
+ /* Check for end-of-transfer interrupt. */
+ if (tfr_reg & DMA_CHANNEL(chan)) {
+ /*
+ *Each DMA command produces 2 interrupts. Only
+ * complete the command after both interrupts have been
+ * seen. (See sata_dwc_isr())
+ */
+ dma_interrupt_count++;
+
+ sata_dwc_clear_dmacr(hsdevp, tag);
+
+ if (hsdevp->dma_pending[tag] == 0) {
+ dev_err(ap->dev, "DMA not pending eot=0x%08x "
+ "err=0x%08x tag=0x%02x pending=%d\n",
+ tfr_reg, err_reg, tag,
+ hsdevp->dma_pending[tag]);
+ }
+
+ if ((dma_interrupt_count % 2) == 0)
+ sata_dwc_dma_xfer_complete(ap, 1);
+
+ /* Clear the interrupt */
+ out_le32(&(sata_dma_regs->interrupt_clear.tfr.low),
+ DMA_CHANNEL(chan));
+ }
+
+ /* Check for error interrupt. */
+ if (err_reg & DMA_CHANNEL(chan)) {
+ /* TODO Need error handler ! */
+ dev_err(ap->dev, "error interrupt err_reg=0x%08x\n",
+ err_reg);
+
+ /* Clear the interrupt. */
+ out_le32(&(sata_dma_regs->interrupt_clear.error.low),
+ DMA_CHANNEL(chan));
+ }
+ }
+
+ spin_unlock_irqrestore(&host->lock, flags);
spin_lock_irqsave() is most likely expensive overkill. Use spin_lock()
unless you have concrete justification for something else.
+/*
+ * Function: dma_request_interrupts
+ * arguments: hsdev
+ * returns status
+ * This function registers ISR for a particular DMA channel interrupt
+ */
+static int dma_request_interrupts(struct sata_dwc_device *hsdev, int irq)
+{
+ int retval = 0;
+ int chan;
+
+ for (chan = 0; chan < DMA_NUM_CHANS; chan++) {
+ /* Unmask error interrupt */
+ out_le32(&sata_dma_regs->interrupt_mask.error.low,
+ DMA_ENABLE_CHAN(chan));
+
+ /* Unmask end-of-transfer interrupt */
+ out_le32(&sata_dma_regs->interrupt_mask.tfr.low,
+ DMA_ENABLE_CHAN(chan));
+ }
+
+ retval = request_irq(irq, dma_dwc_interrupt, 0, "SATA DMA", hsdev);
+ if (retval) {
+ dev_err(dwc_dev, "%s: could not get IRQ %d\n", __func__, irq);
+ return -ENODEV;
+ }
+
+ /* Mark this interrupt as requested */
+ hsdev->irq_dma = irq;
+
+ return 0;
+}
+
+/*
+ * Function: map_sg_to_lli
+ * arguments: sg: scatter/gather list(sg)
+ * num_elems: no of elements in sg list
+ * dma_lli: LLI table
+ * dest: destination address
+ * read: whether the transfer is read or write
+ * returns array of AHB DMA Linked List Items
+ * This function creates a list of LLIs for DMA Xfr and returns the number
+ * of elements in the DMA linked list.
+ *
+ * Note that the Synopsis driver has a comment proposing that better performance
+ * is possible by only enabling interrupts on the last item in the linked list.
+ * However, it seems that could be a problem if an error happened on one of the
+ * first items. The transfer would halt, but no error interrupt would occur.
+ *
+ * Currently this function sets interrupts enabled for each linked list item:
+ * DMA_CTL_INT_EN.
+ */
+static int map_sg_to_lli(struct scatterlist *sg, int num_elems, struct lli *lli,
+ dma_addr_t dma_lli, void __iomem *dmadr_addr, int dir)
+{
+ int i, idx = 0;
+ int fis_len = 0;
+ dma_addr_t next_llp;
+ int bl;
+ unsigned int dma_ts = 0;
+
+ dev_dbg(dwc_dev, "%s: sg=%p nelem=%d lli=%p dma_lli=0x%08x "
+ "dmadr=0x%08x\n", __func__, sg, num_elems, lli, (u32)dma_lli,
+ (u32)dmadr_addr);
+
+ bl = get_burst_length_encode(AHB_DMA_BRST_DFLT);
+
+ for (i = 0; i < num_elems; i++, sg++) {
+ u32 addr, offset;
+ u32 sg_len, len;
+
+ addr = (u32) sg_dma_address(sg);
+ sg_len = sg_dma_len(sg);
+
+ dev_dbg(dwc_dev, "%s: elem=%d sg_addr=0x%x sg_len=%d\n",
+ __func__, i, addr, sg_len);
+
+ while (sg_len) {
+
+ if (idx >= SATA_DWC_DMAC_LLI_NUM) {
+ /* The LLI table is not large enough. */
+ dev_err(dwc_dev, "LLI table overrun (idx=%d)\n",
+ idx);
+ break;
+ }
+ len = (sg_len > SATA_DWC_DMAC_CTRL_TSIZE_MAX) ?
+ SATA_DWC_DMAC_CTRL_TSIZE_MAX : sg_len;
+
+ offset = addr & 0xffff;
+ if ((offset + sg_len) > 0x10000)
+ len = 0x10000 - offset;
+
+ /*
+ * Make sure a LLI block is not created that will span a
+ * 8K max FIS boundary. If the block spans such a FIS
+ * boundary, there is a chance that a DMA burst will
+ * cross that boundary -- this results in an error in
+ * the host controller.
+ */
+ if (fis_len + len > 8192) {
+ dev_dbg(dwc_dev, "SPLITTING: fis_len=%d(0x%x) "
+ "len=%d(0x%x)\n", fis_len, fis_len,
+ len, len);
+ len = 8192 - fis_len;
+ fis_len = 0;
+ } else {
+ fis_len += len;
+ }
+ if (fis_len == 8192)
+ fis_len = 0;
+
+ /*
+ * Set DMA addresses and lower half of control register
+ * based on direction.
+ */
+ if (dir == DMA_FROM_DEVICE) {
+ lli[idx].dar = cpu_to_le32(addr);
+ lli[idx].sar = cpu_to_le32((u32)dmadr_addr);
+
+ lli[idx].ctl.low = cpu_to_le32(
+ DMA_CTL_TTFC(DMA_CTL_TTFC_P2M_DMAC) |
+ DMA_CTL_SMS(0) |
+ DMA_CTL_DMS(1) |
+ DMA_CTL_SRC_MSIZE(bl) |
+ DMA_CTL_DST_MSIZE(bl) |
+ DMA_CTL_SINC_NOCHANGE |
+ DMA_CTL_SRC_TRWID(2) |
+ DMA_CTL_DST_TRWID(2) |
+ DMA_CTL_INT_EN |
+ DMA_CTL_LLP_SRCEN |
+ DMA_CTL_LLP_DSTEN);
+ } else { /* DMA_TO_DEVICE */
+ lli[idx].sar = cpu_to_le32(addr);
+ lli[idx].dar = cpu_to_le32((u32)dmadr_addr);
+
+ lli[idx].ctl.low = cpu_to_le32(
+ DMA_CTL_TTFC(DMA_CTL_TTFC_M2P_PER) |
+ DMA_CTL_SMS(1) |
+ DMA_CTL_DMS(0) |
+ DMA_CTL_SRC_MSIZE(bl) |
+ DMA_CTL_DST_MSIZE(bl) |
+ DMA_CTL_DINC_NOCHANGE |
+ DMA_CTL_SRC_TRWID(2) |
+ DMA_CTL_DST_TRWID(2) |
+ DMA_CTL_INT_EN |
+ DMA_CTL_LLP_SRCEN |
+ DMA_CTL_LLP_DSTEN);
+ }
+
+ dev_dbg(dwc_dev, "%s setting ctl.high len: 0x%08x val: "
+ "0x%08x\n", __func__, len,
+ DMA_CTL_BLK_TS(len / 4));
+
+ /* Program the LLI CTL high register */
+ dma_ts = DMA_CTL_BLK_TS(len / 4);
+ lli[idx].ctl.high = cpu_to_le32(dma_ts);
+
+ /*
+ *Program the next pointer. The next pointer must be
+ * the physical address, not the virtual address.
+ */
+ next_llp = (dma_lli + ((idx + 1) * sizeof(struct lli)));
+
+ /* The last 2 bits encode the list master select. */
+ next_llp = DMA_LLP_LMS(next_llp, DMA_LLP_AHBMASTER2);
+
+ lli[idx].llp = cpu_to_le32(next_llp);
+
+ idx++;
+ sg_len -= len;
+ addr += len;
+ }
+ }
+
+ /*
+ * The last next ptr has to be zero and the last control low register
+ * has to have LLP_SRC_EN and LLP_DST_EN (linked list pointer source
+ * and destination enable) set back to 0 (disabled.) This is what tells
+ * the core that this is the last item in the linked list.
+ */
+ if (idx) {
+ lli[idx-1].llp = 0x00000000;
+ lli[idx-1].ctl.low &= DMA_CTL_LLP_DISABLE_LE32;
+
+ /* Flush cache to memory */
+ dma_cache_sync(NULL, lli, (sizeof(struct lli) * idx),
+ DMA_BIDIRECTIONAL);
+ }
+
+ return idx;
+}
+
+/*
+ * Function: dma_dwc_xfer_start
+ * arguments: Channel number
+ * Return : None
+ * Enables the DMA channel
+ */
+static void dma_dwc_xfer_start(int dma_ch)
+{
+ /* Enable the DMA channel */
+ out_le32(&(sata_dma_regs->dma_chan_en.low),
+ in_le32(&(sata_dma_regs->dma_chan_en.low)) |
+ DMA_ENABLE_CHAN(dma_ch));
+}
+
+static int dma_dwc_channel_enabled(int ch)
+{
+ if (in_le32(&(sata_dma_regs->dma_chan_en.low)) & DMA_CHANNEL(ch))
+ return 1;
+
+ return 0;
+}
+
+static void dma_dwc_terminate_dma(int dma_ch)
+{
+ int enabled = dma_dwc_channel_enabled(dma_ch);
+
+ dev_info(dwc_dev, "%s terminate DMA on channel=%d enabled=%d\n",
+ __func__, dma_ch, enabled);
+
+ if (enabled) {
+ out_le32(&(sata_dma_regs->dma_chan_en.low),
+ DMA_DISABLE_CHAN(dma_ch));
+
+ do {
+ enabled = dma_dwc_channel_enabled(dma_ch);
+ } while (enabled);
+ }
+}
+
+static int dma_dwc_xfer_setup(struct scatterlist *sg, int num_elems,
+ struct lli *lli, dma_addr_t dma_lli,
+ void __iomem *addr, int dir)
+{
+ int dma_ch;
+ int num_lli;
+
+ /* Acquire DMA channel */
+ dma_ch = dma_request_channel();
+ if (dma_ch == -1) {
+ dev_err(dwc_dev, "%s: dma channel unavailable\n", __func__);
+ return -EAGAIN;
+ }
+
+ /* Convert SG list to linked list of items (LLIs) for AHB DMA */
+ num_lli = map_sg_to_lli(sg, num_elems, lli, dma_lli, addr, dir);
+
+ dev_dbg(dwc_dev, "%s sg: 0x%p, count: %d lli: %p dma_lli: 0x%0xlx addr:"
+ " %p lli count: %d\n", __func__, sg, num_elems, lli,
+ (u32)dma_lli, addr, num_lli);
+
+ /* Clear channel interrupts */
+ clear_chan_interrupts(dma_ch);
+
+ /* Program the CFG register. */
+ out_le32(&(sata_dma_regs->chan_regs[dma_ch].cfg.high),
+ DMA_CFG_PROTCTL | DMA_CFG_FCMOD_REQ);
+ out_le32(&(sata_dma_regs->chan_regs[dma_ch].cfg.low), 0);
+
+ /* Program the address of the linked list */
+ out_le32(&(sata_dma_regs->chan_regs[dma_ch].llp.low),
+ DMA_LLP_LMS(dma_lli, DMA_LLP_AHBMASTER2));
+
+ /* Program the CTL register with src enable / dst enable */
+ out_le32(&(sata_dma_regs->chan_regs[dma_ch].ctl.low),
+ DMA_CTL_LLP_SRCEN | DMA_CTL_LLP_DSTEN);
+
+ return 0;
+}
+
add this is inside a spinlock, at all times, I hope?
+static void dma_dwc_exit(struct sata_dwc_device *hsdev)
+{
+ dev_dbg(dwc_dev, "%s:\n", __func__);
+ if (sata_dma_regs)
+ iounmap(sata_dma_regs);
+
+ if (hsdev->irq_dma)
+ free_irq(hsdev->irq_dma, hsdev);
+}
+
+/*
+ * Function: dma_dwc_init
+ * arguments: hsdev
+ * returns status
+ * This function initializes the SATA DMA driver
+ */
+static int dma_dwc_init(struct sata_dwc_device *hsdev, struct resource *res,
+ int irq)
+{
+ int err;
+
+ sata_dma_regs = ioremap(res->start, res->end - res->start + 1);
+ if (!sata_dma_regs) {
+ dev_err(dwc_dev, "%s: ioremap failed\n", __func__);
+ err = -ENODEV;
+ goto error_out;
+ }
+
+ err = dma_request_interrupts(hsdev, irq);
+ if (err) {
+ dev_err(dwc_dev, "%s: dma_request_interrupts returns %d\n",
+ __func__, err);
+ goto error_out;
+ }
+
+ /* Enabe DMA */
+ out_le32(&(sata_dma_regs->dma_cfg.low), DMA_EN);
+
+ dev_notice(dwc_dev, "DMA initialized\n");
+ dev_dbg(dwc_dev, "SATA DMA registers=0x%p\n", sata_dma_regs);
+
+ return 0;
+
+error_out:
+ dma_dwc_exit(hsdev);
+
+ return err;
+}
+
+static int sata_dwc_scr_read(struct ata_link *link, unsigned int scr, u32 *val)
+{
+ if (scr > SCR_NOTIFICATION) {
+ dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
+ __func__, scr);
+ return -EINVAL;
+ }
+
+ *val = in_le32((void *)link->ap->ioaddr.scr_addr + (scr * 4));
+ dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=val=0x%08x\n",
+ __func__, link->ap->print_id, scr, *val);
+
+ return 0;
+}
+
+static int sata_dwc_scr_write(struct ata_link *link, unsigned int scr, u32 val)
+{
+ dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=val=0x%08x\n",
+ __func__, link->ap->print_id, scr, val);
+ if (scr > SCR_NOTIFICATION) {
+ dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
+ __func__, scr);
+ return -EINVAL;
+ }
+ out_le32((void *)link->ap->ioaddr.scr_addr + (scr * 4), val);
+
+ return 0;
+}
+
+static inline u32 core_scr_read(unsigned int scr)
+{
+ return in_le32((void __iomem *)scr_addr_sstatus + (scr * 4));
+}
+
+static inline void core_scr_write(unsigned int scr, u32 val)
+{
+ out_le32((void __iomem *)scr_addr_sstatus + (scr * 4), val);
+}
+
+static inline void clear_serror(void)
+{
+ out_le32((void __iomem *)scr_addr_sstatus + 4,
+ in_le32((void __iomem *)scr_addr_sstatus + 4));
+}
adding __iomem casts indicates you are _missing_ iomem casts elsewhere
+static inline void clear_intpr(struct sata_dwc_device *hsdev)
+{
+ out_le32(&hsdev->sata_dwc_regs->intpr,
+ in_le32(&hsdev->sata_dwc_regs->intpr));
+}
+
+static inline void clear_interrupt_bit(struct sata_dwc_device *hsdev, u32 bit)
+{
+ out_le32(&hsdev->sata_dwc_regs->intpr,
+ in_le32(&hsdev->sata_dwc_regs->intpr));
+}
+
+static inline void disable_err_irq(struct sata_dwc_device *hsdev)
+{
+ out_le32(&hsdev->sata_dwc_regs->intmr,
+ in_le32(&hsdev->sata_dwc_regs->intmr) & ~SATA_DWC_INTMR_ERRM);
+ out_le32(&hsdev->sata_dwc_regs->errmr, ~SATA_DWC_SERROR_ERR_BITS);
+}
+
+static inline void enable_err_irq(struct sata_dwc_device *hsdev)
+{
+ out_le32(&hsdev->sata_dwc_regs->intmr,
+ in_le32(&hsdev->sata_dwc_regs->intmr) | SATA_DWC_INTMR_ERRM);
+ out_le32(&hsdev->sata_dwc_regs->errmr, SATA_DWC_SERROR_ERR_BITS);
+}
+
+static inline u32 qcmd_tag_to_mask(u8 tag)
+{
+ return 0x00000001 << (tag & 0x1f);
+}
+
+/* See ahci.c */
+static void sata_dwc_error_intr(struct ata_port *ap,
+ struct sata_dwc_device *hsdev, uint intpr)
+{
+ struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
+ struct ata_eh_info *ehi = &ap->link.eh_info;
+ unsigned int err_mask = 0, action = 0;
+ struct ata_queued_cmd *qc;
+ u32 serror;
+ u8 status, tag;
+ u32 err_reg;
+
+ ata_ehi_clear_desc(ehi);
+
+ serror = core_scr_read(SCR_ERROR);
+ status = ap->ops->sff_check_status(ap);
+
+ err_reg = in_le32(&(sata_dma_regs->interrupt_status.error.low));
+ tag = ap->link.active_tag;
+
+ dev_err(ap->dev, "%s SCR_ERROR=0x%08x intpr=0x%08x status=0x%08x "
+ "dma_intp=%d pending=%d issued=%d dma_err_status=0x%08x\n",
+ __func__, serror, intpr, status, dma_interrupt_count,
+ hsdevp->dma_pending[tag], hsdevp->cmd_issued[tag], err_reg);
+
+ /* Clear error register and interrupt bit */
+ clear_serror();
+ clear_interrupt_bit(hsdev, SATA_DWC_INTPR_ERR);
+
+ /* This is the only error happening now. */
+ /* TODO check for exact error */
+ err_mask |= AC_ERR_HOST_BUS;
+ action |= ATA_EH_RESET;
+
+ /* Pass this on to EH */
+ ehi->serror |= serror;
+ ehi->action |= action;
+
+ qc = ata_qc_from_tag(ap, tag);
+ if (qc)
+ qc->err_mask |= err_mask;
+ else
+ ehi->err_mask |= err_mask;
+
+ ata_port_abort(ap);
+
+ /*
+ if (irq_stat & PORT_IRQ_FREEZE)
+ ata_port_freeze(ap);
+ else
+ ata_port_abort(ap);
+ */
+}
+
+/*
+ * Function : sata_dwc_isr
+ * arguments : irq, void *dev_instance, struct pt_regs *regs
+ * Return value : irqreturn_t - status of IRQ
+ * This Interrupt handler called via port ops registered function.
+ * .irq_handler = sata_dwc_isr
+ */
+static irqreturn_t sata_dwc_isr(int irq, void *dev_instance)
+{
+ struct ata_host *host = (struct ata_host *)dev_instance;
+ struct sata_dwc_device *hsdev = HSDEV_FROM_HOST(host);
+ struct ata_port *ap;
+ struct ata_queued_cmd *qc;
+ unsigned long flags;
+ u8 status, tag;
+ int handled, num_processed, port = 0;
+ uint intpr, sactive, sactive2, tag_mask;
+ struct sata_dwc_device_port *hsdevp;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ /* Read the interrupt register */
+ intpr = in_le32(&hsdev->sata_dwc_regs->intpr);
+
+ ap = host->ports[port];
+ hsdevp = HSDEVP_FROM_AP(ap);
+
+ dev_dbg(ap->dev, "%s intpr=0x%08x active_tag=%d\n", __func__, intpr,
+ ap->link.active_tag);
+
+ /* Check for error interrupt */
+ if (intpr & SATA_DWC_INTPR_ERR) {
+ sata_dwc_error_intr(ap, hsdev, intpr);
+ handled = 1;
+ goto done_irqrestore;
+ }
+
+ /* Check for DMA SETUP FIS (FP DMA) interrupt */
+ if (intpr & SATA_DWC_INTPR_NEWFP) {
+ clear_interrupt_bit(hsdev, SATA_DWC_INTPR_NEWFP);
+
+ tag = (u8)(in_le32(&hsdev->sata_dwc_regs->fptagr));
+ dev_dbg(ap->dev, "%s: NEWFP tag=%d\n", __func__, tag);
+ if (hsdevp->cmd_issued[tag] != SATA_DWC_CMD_ISSUED_PEND)
+ dev_warn(ap->dev, "CMD tag=%d not pending?\n", tag);
+
+ sata_dwc_sactive_issued |= qcmd_tag_to_mask(tag);
+
+ qc = ata_qc_from_tag(ap, tag);
+ /*
+ * Start FP DMA for NCQ command. At this point the tag is the
+ * active tag. It is the tag that matches the command about to
+ * be completed.
+ */
+ qc->ap->link.active_tag = tag;
+ sata_dwc_bmdma_start_by_tag(qc, tag);
+
+ handled = 1;
+ goto done_irqrestore;
+ }
+
+ sactive = core_scr_read(SCR_ACTIVE);
+ tag_mask = (sata_dwc_sactive_issued | sactive) ^ sactive;
+
+ /* If no sactive issued and tag_mask is zero then this is not NCQ */
+ if (sata_dwc_sactive_issued == 0 && tag_mask == 0) {
+ tag = 0;
+ qc = ata_qc_from_tag(ap, tag);
+
+ /* DEV interrupt w/ no active qc? */
+ if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) {
+ dev_err(ap->dev, "%s intr with no active qc qc=%p\n",
+ __func__, qc);
+ ata_sff_check_status(ap);
+ handled = 1;
+ goto done_irqrestore;
+ }
+
+ status = ap->ops->sff_check_status(ap);
+
+ qc->ap->link.active_tag = tag;
+ hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
+
+ if (status & ATA_ERR) {
+ dev_dbg(ap->dev, "interrupt ATA_ERR (0x%x)\n", status);
+ sata_dwc_qc_complete(ap, qc, 1);
+ handled = 1;
+ goto done_irqrestore;
+ }
+
+ dev_dbg(ap->dev, "%s non-NCQ cmd interrupt, protocol: %s\n",
+ __func__, prot_2_txt(qc->tf.protocol));
+drv_still_busy:
+ if (ata_is_dma(qc->tf.protocol)) {
+ int dma_flag = hsdevp->dma_pending[tag];
+ /*
+ * Each DMA transaction produces 2 interrupts. The DMAC
+ * transfer complete interrupt and the SATA controller
+ * operation done interrupt. The command should be
+ * completed only after both interrupts are seen.
+ */
+ dma_interrupt_count++;
+ if (dma_flag == SATA_DWC_DMA_PEND_NONE) {
+ dev_err(ap->dev, "%s: DMA not pending "
+ "intpr=0x%08x status=0x%08x pend=%d\n",
+ __func__, intpr, status, dma_flag);
+ }
+
+ if ((dma_interrupt_count % 2) == 0)
+ sata_dwc_dma_xfer_complete(ap, 1);
+ } else {
+ if (unlikely(sata_dwc_qc_complete(ap, qc, 1)))
+ goto drv_still_busy;
+ }
+
+ handled = 1;
+ goto done_irqrestore;
+ }
+
+ /*
+ * This is a NCQ command. At this point we need to figure out for which
+ * tags we have gotten a completion interrupt. One interrupt may serve
+ * as completion for more than one operation when commands are queued
+ * (NCQ). We need to process each completed command.
+ */
+
+process_cmd: /* process completed commands */
+ sactive = core_scr_read(SCR_ACTIVE);
+ tag_mask = (sata_dwc_sactive_issued | sactive) ^ sactive;
+
+ if (sactive != 0 || sata_dwc_sactive_issued > 1 || tag_mask > 1) {
+ dev_dbg(ap->dev, "%s NCQ: sactive=0x%08x sactive_issued=0x%08x"
+ " tag_mask=0x%08x\n", __func__, sactive,
+ sata_dwc_sactive_issued, tag_mask);
+ }
+
+ if ((tag_mask | sata_dwc_sactive_issued) != sata_dwc_sactive_issued) {
+ dev_warn(ap->dev, "Bad tag mask? sactive=0x%08x "
+ "sata_dwc_sactive_issued=0x%08x tag_mask=0x%08x\n",
+ sactive, sata_dwc_sactive_issued, tag_mask);
+ }
+
+ /* read just to clear ... not bad if currently still busy */
+ status = ap->ops->sff_check_status(ap);
+ dev_dbg(ap->dev, "%s ATA status register=0x%x\n", __func__, status);
+
+ tag = 0;
+ num_processed = 0;
+ while (tag_mask) {
+ num_processed++;
+ while (!(tag_mask & 0x00000001)) {
+ tag++;
+ tag_mask <<= 1;
+ }
+ tag_mask &= (~0x00000001);
+ qc = ata_qc_from_tag(ap, tag);
+
+ /* To be picked up by completion functions */
+ qc->ap->link.active_tag = tag;
+ hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
+
+ /* Let libata/scsi layers handle error */
+ if (status & ATA_ERR) {
+ dev_dbg(ap->dev, "%s ATA_ERR (0x%x)\n",
+ __func__, status);
+
+ sata_dwc_qc_complete(ap, qc, 1);
+ handled = 1;
+ goto done_irqrestore;
+ }
+
+ /* Process completed command */
+ dev_dbg(ap->dev, "%s NCQ command, protocol: %s\n", __func__,
+ prot_2_txt(qc->tf.protocol));
+ if (ata_is_dma(qc->tf.protocol)) {
+ dma_interrupt_count++;
+ if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PEND_NONE)
+ dev_warn(ap->dev,
+ "%s: DMA not pending?\n", __func__);
+ if ((dma_interrupt_count % 2) == 0)
+ sata_dwc_dma_xfer_complete(ap, 1);
+ } else {
+ if (unlikely(sata_dwc_qc_complete(ap, qc, 1)))
+ goto still_busy;
+ }
+ continue;
+
+still_busy:
+ ap->stats.idle_irq++;
+ dev_warn(ap->dev, "STILL BUSY IRQ ata%d: irq trap\n",
+ ap->print_id);
+ } /* while tag_mask */
+
+ /*
+ * Check to see if any commands completed while we were processing our
+ * initial set of completed commands (reading of status clears
+ * interrupts, so we might miss a completed command interrupt if one
+ * came in while we were processing:
+ * we read status as part of processing a completed command).
+ */
+ sactive2 = core_scr_read(SCR_ACTIVE);
+ if (sactive2 != sactive) {
+ dev_dbg(ap->dev, "More finished - sactive=0x%x sactive2=0x%x\n",
+ sactive, sactive2);
+ goto process_cmd;
+ }
+ handled = 1;
+
+done_irqrestore:
+ spin_unlock_irqrestore(&host->lock, flags);
+ return IRQ_RETVAL(handled);
1) it is completely silly to have a function this large. break it up
into multiple, smaller functions.
2) same comment as above -- spin_lock_irqsave() is both expensive and
probably wrong, for this irq handler
+static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag)
+{
+ struct sata_dwc_device *hsdev = HSDEV_FROM_HSDEVP(hsdevp);
+
+ if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PEND_RX) {
+ out_le32(&(hsdev->sata_dwc_regs->dmacr),
+ SATA_DWC_DMACR_RX_CLEAR(
+ in_le32(&(hsdev->sata_dwc_regs->dmacr))));
+ } else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PEND_TX) {
+ out_le32(&(hsdev->sata_dwc_regs->dmacr),
+ SATA_DWC_DMACR_TX_CLEAR(
+ in_le32(&(hsdev->sata_dwc_regs->dmacr))));
+ } else {
+ /*
+ * This should not happen, it indicates the driver is out of
+ * sync. If it does happen, clear dmacr anyway.
+ */
+ dev_err(dwc_dev, "%s DMA protocol RX and TX DMA not pending "
+ "tag=0x%02x pending=%d dmacr: 0x%08x\n",
+ __func__, tag, hsdevp->dma_pending[tag],
+ in_le32(&(hsdev->sata_dwc_regs->dmacr)));
+ out_le32(&(hsdev->sata_dwc_regs->dmacr),
+ SATA_DWC_DMACR_TXRXCH_CLEAR);
+ }
+}
+
+static void sata_dwc_dma_xfer_complete(struct ata_port *ap, u32 check_status)
+{
+ struct ata_queued_cmd *qc;
+ struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
+ struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
+ u8 tag = 0;
+
+ tag = ap->link.active_tag;
+ qc = ata_qc_from_tag(ap, tag);
+
+#ifdef DEBUG_NCQ
+ if (tag > 0) {
+ dev_info(ap->dev, "%s tag=%u cmd=0x%02x dma dir=%s proto=%s "
+ "dmacr=0x%08x\n", __func__, qc->tag, qc->tf.command,
+ dir_2_txt(qc->dma_dir), prot_2_txt(qc->tf.protocol),
+ in_le32(&(hsdev->sata_dwc_regs->dmacr)));
+ }
+#endif
+
+ if (ata_is_dma(qc->tf.protocol)) {
+ if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PEND_NONE) {
+ dev_err(ap->dev, "%s DMA protocol RX and TX DMA not "
+ "pending dmacr: 0x%08x\n", __func__,
+ in_le32(&(hsdev->sata_dwc_regs->dmacr)));
+ }
+
+ hsdevp->dma_pending[tag] = SATA_DWC_DMA_PEND_NONE;
+ sata_dwc_qc_complete(ap, qc, check_status);
+ ap->link.active_tag = ATA_TAG_POISON;
+ } else {
+ sata_dwc_qc_complete(ap, qc, check_status);
+ }
+}
+
+static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc,
+ u32 check_status)
+{
+ u8 status = 0;
+ int i = 0;
+ u32 mask = 0x0;
+ u8 tag = qc->tag;
+ struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
+ u32 serror;
+
+ dev_dbg(ap->dev, "%s checkstatus? %x\n", __func__, check_status);
+
+ if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PEND_TX)
+ dev_err(ap->dev, "TX DMA PENDING\n");
+ else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PEND_RX)
+ dev_err(ap->dev, "RX DMA PENDING\n");
+
+ if (check_status) {
+ i = 0;
+ do {
+ /* check main status, clearing INTRQ */
+ status = ap->ops->sff_check_status(ap);
+ if (status & ATA_BUSY) {
+ dev_dbg(ap->dev, "STATUS BUSY (0x%02x) [%d]\n",
+ status, i);
+ }
+ if (++i > 10)
+ break;
+ } while (status & ATA_BUSY);
+
+ status = ap->ops->sff_check_status(ap);
+ if (unlikely(status & ATA_BUSY))
+ dev_err(ap->dev, "QC complete cmd=0x%02x STATUS BUSY "
+ "(0x%02x) [%d]\n", qc->tf.command, status, i);
+ serror = core_scr_read(SCR_ERROR);
+ if (serror & SATA_DWC_SERROR_ERR_BITS)
+ dev_err(ap->dev, "****** SERROR=0x%08x ******\n",
+ serror);
+ }
it is both silly and expensive to call a hook from your own driver.
just call the function directly!
+ dev_dbg(ap->dev, "QC complete cmd=0x%02x status=0x%02x ata%u: "
+ "protocol=%d\n", qc->tf.command, status, ap->print_id,
+ qc->tf.protocol);
+
+ /* clear active bit */
+ mask = (~(qcmd_tag_to_mask(tag)));
+ sata_dwc_sactive_queued = sata_dwc_sactive_queued & mask;
+ sata_dwc_sactive_issued = sata_dwc_sactive_issued & mask;
+
+ /* Complete taskfile transaction (does not read SCR registers) */
+ ata_qc_complete(qc);
+
+ return 0;
+}
+
+static void sata_dwc_enable_interrupts(struct sata_dwc_device *hsdev)
+{
+ /* Enable selective interrupts by setting the interrupt mask register */
+ out_le32(&hsdev->sata_dwc_regs->intmr,
+ SATA_DWC_INTMR_ERRM |
+ SATA_DWC_INTMR_NEWFPM |
+ SATA_DWC_INTMR_PMABRTM |
+ SATA_DWC_INTMR_DMATM);
+
+ /*
+ * Unmask the error bits that should trigger an error interrupt by
+ * setting the error mask register.
+ */
+ out_le32(&hsdev->sata_dwc_regs->errmr, SATA_DWC_SERROR_ERR_BITS);
+
+ dev_dbg(dwc_dev, "%s: INTMR = 0x%08x, ERRMR = 0x%08x\n", __func__,
+ in_le32(&hsdev->sata_dwc_regs->intmr),
+ in_le32(&hsdev->sata_dwc_regs->errmr));
+}
+
+static void sata_dwc_setup_port(struct ata_ioports *port, unsigned long base)
+{
+ port->cmd_addr = (void *)base + 0x00;
+ port->data_addr = (void *)base + 0x00;
+
+ port->error_addr = (void *)base + 0x04;
+ port->feature_addr = (void *)base + 0x04;
+
+ port->nsect_addr = (void *)base + 0x08;
+
+ port->lbal_addr = (void *)base + 0x0c;
+ port->lbam_addr = (void *)base + 0x10;
+ port->lbah_addr = (void *)base + 0x14;
+
+ port->device_addr = (void *)base + 0x18;
+ port->command_addr = (void *)base + 0x1c;
+ port->status_addr = (void *)base + 0x1c;
+
+ port->altstatus_addr = (void *)base + 0x20;
+ port->ctl_addr = (void *)base + 0x20;
casts indicate a C typing bug
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