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Date: Wed, 8 Apr 2009 01:56:25 -0400
From: Jeff Garzik <jeff@...zik.org>
To: linux-ide@...r.kernel.org
Cc: LKML <linux-kernel@...r.kernel.org>, jameshsu@...rd.com,
jason_wu@...rd.com, derwei@...rd.com, laurence@...rd.com,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] ahci: add ACard 8620 support (rough draft)
This patch adds support for a 99% compatible AHCI clone, ACard 8620.
Its datasheet has been public for quite a while, contributed by ACard
themselves:
http://gkernel.sourceforge.net/specs/acard/ATP8620pub_Rev0.98.pdf
These changes are guesses based on the PDF and notes from an ACard
engineer. I do not have hardware, and have no way of testing this
patch.
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 57be6be..dea25e0 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -114,6 +114,7 @@ enum {
board_ahci_sb700 = 5, /* for SB700 and SB800 */
board_ahci_mcp65 = 6,
board_ahci_nopmp = 7,
+ board_ahci_acard = 8,
/* global controller registers */
HOST_CAP = 0x00, /* host capabilities */
@@ -156,6 +157,7 @@ enum {
PORT_SCR_ERR = 0x30, /* SATA phy register: SError */
PORT_SCR_ACT = 0x34, /* SATA phy register: SActive */
PORT_SCR_NTF = 0x3c, /* SATA phy register: SNotification */
+ PORT_SDB_FISBITS = 0x44, /* ACard: SDB FIS bits, RW1C */
/* PORT_IRQ_{STAT,MASK} bits */
PORT_IRQ_COLD_PRES = (1 << 31), /* cold presence detect */
@@ -250,6 +252,13 @@ struct ahci_sg {
__le32 flags_size;
};
+struct acard_sg {
+ __le32 addr;
+ __le32 addr_hi;
+ __le32 flags; /* bit 31 == EOT */
+ __le32 size; /* max==0x10000 (64k) */
+};
+
struct ahci_em_priv {
enum sw_activity blink_policy;
struct timer_list timer;
@@ -292,6 +301,7 @@ static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
static int ahci_port_start(struct ata_port *ap);
static void ahci_port_stop(struct ata_port *ap);
static void ahci_qc_prep(struct ata_queued_cmd *qc);
+static void acard_qc_prep(struct ata_queued_cmd *qc);
static void ahci_freeze(struct ata_port *ap);
static void ahci_thaw(struct ata_port *ap);
static void ahci_pmp_attach(struct ata_port *ap);
@@ -311,7 +321,6 @@ static void ahci_error_handler(struct ata_port *ap);
static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
static int ahci_port_resume(struct ata_port *ap);
static void ahci_dev_config(struct ata_device *dev);
-static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl);
static void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
u32 opts);
#ifdef CONFIG_PM
@@ -346,6 +355,19 @@ static struct scsi_host_template ahci_sht = {
.sdev_attrs = ahci_sdev_attrs,
};
+static struct scsi_host_template acard_sht = {
+ ATA_NCQ_SHT(DRV_NAME),
+ .can_queue = AHCI_MAX_CMDS - 1,
+ .sg_tablesize = AHCI_MAX_SG,
+
+ /* we don't really care about the DMA boundary... we use this
+ * to limit our DMA segment size to 64k
+ */
+ .dma_boundary = ATA_DMA_BOUNDARY,
+ .shost_attrs = ahci_shost_attrs,
+ .sdev_attrs = ahci_sdev_attrs,
+};
+
static struct ata_port_operations ahci_ops = {
.inherits = &sata_pmp_port_ops,
@@ -399,6 +421,11 @@ static struct ata_port_operations ahci_sb600_ops = {
.pmp_softreset = ahci_sb600_softreset,
};
+static struct ata_port_operations acard_ops = {
+ .inherits = &ahci_ops,
+ .qc_prep = acard_qc_prep,
+};
+
#define AHCI_HFLAGS(flags) .private_data = (void *)(flags)
static const struct ata_port_info ahci_port_info[] = {
@@ -469,6 +496,13 @@ static const struct ata_port_info ahci_port_info[] = {
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_ops,
},
+ /* board_ahci_acard */
+ {
+ .flags = AHCI_FLAG_COMMON,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &acard_ops,
+ },
};
static const struct pci_device_id ahci_pci_tbl[] = {
@@ -608,6 +642,9 @@ static const struct pci_device_id ahci_pci_tbl[] = {
/* Promise */
{ PCI_VDEVICE(PROMISE, 0x3f20), board_ahci }, /* PDC42819 */
+ /* ACard */
+ { PCI_VDEVICE(ARTOP, 0x000D), board_ahci_acard },
+
/* Generic, PCI class code for AHCI */
{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff, board_ahci },
@@ -1948,6 +1985,78 @@ static void ahci_qc_prep(struct ata_queued_cmd *qc)
ahci_fill_cmd_slot(pp, qc->tag, opts);
}
+static unsigned int acard_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
+{
+ struct scatterlist *sg;
+ struct acard_sg *acard_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
+ unsigned int si, last_si = 0;
+
+ VPRINTK("ENTER\n");
+
+ /*
+ * Next, the S/G list.
+ */
+ for_each_sg(qc->sg, sg, qc->n_elem, si) {
+ dma_addr_t addr = sg_dma_address(sg);
+ u32 sg_len = sg_dma_len(sg);
+
+ /* ACard note: flags and size are different
+ * fields, rather than AHCI's flags_size,
+ * we must set an end-of-table (EOT) bit,
+ * and the segment cannot exceed 64k (0x10000)
+ */
+ acard_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
+ acard_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
+ acard_sg[si].flags = 0;
+ acard_sg[si].size = cpu_to_le32(sg_len);
+ last_si = si;
+ }
+
+ acard_sg[last_si].flags |= cpu_to_le32(1 << 31); /* set EOT */
+
+ return si;
+}
+
+static void acard_qc_prep(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct ahci_port_priv *pp = ap->private_data;
+ int is_atapi = ata_is_atapi(qc->tf.protocol);
+ void *cmd_tbl;
+ u32 opts;
+ const u32 cmd_fis_len = 5; /* five dwords */
+ unsigned int n_elem;
+
+ /*
+ * Fill in command table information. First, the header,
+ * a SATA Register - Host to Device command FIS.
+ */
+ cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
+
+ ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
+ if (is_atapi) {
+ memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
+ memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
+ }
+
+ n_elem = 0;
+ if (qc->flags & ATA_QCFLAG_DMAMAP)
+ n_elem = acard_fill_sg(qc, cmd_tbl);
+
+ /*
+ * Fill in command slot information.
+ *
+ * ACard note: prd table length not filled in
+ */
+ opts = cmd_fis_len | (qc->dev->link->pmp << 12);
+ if (qc->tf.flags & ATA_TFLAG_WRITE)
+ opts |= AHCI_CMD_WRITE;
+ if (is_atapi)
+ opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
+
+ ahci_fill_cmd_slot(pp, qc->tag, opts);
+}
+
static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
@@ -2610,6 +2719,7 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
struct device *dev = &pdev->dev;
struct ahci_host_priv *hpriv;
struct ata_host *host;
+ struct scsi_host_template *sht;
int n_ports, i, rc;
VPRINTK("ENTER\n");
@@ -2762,9 +2872,14 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
ahci_init_controller(host);
ahci_print_info(host);
+ if (pdev->vendor == PCI_VENDOR_ID_ARTOP)
+ sht = &acard_sht;
+ else
+ sht = &ahci_sht;
+
pci_set_master(pdev);
return ata_host_activate(host, pdev->irq, ahci_interrupt, IRQF_SHARED,
- &ahci_sht);
+ sht);
}
static int __init ahci_init(void)
--
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