libata: add R-Car SATA driver
Add Renesas R-Car on-chip 3Gbps SATA controller driver.
Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
[Sergei: few bugs fixed, significant cleanup]
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 996d16c..9b58d32 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -260,6 +260,14 @@
If unsure, say N.
+config SATA_RCAR
+ tristate "Renesas R-Car SATA support"
+ depends on ARCH_SHMOBILE && ARCH_R8A7779
+ help
+ This option enables support for Renesas R-Car Serial ATA.
+
+ If unsure, say N.
+
config SATA_SIL
tristate "Silicon Image SATA support"
depends on PCI
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 85e3de4..c04d0fd 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -23,6 +23,7 @@
obj-$(CONFIG_SATA_MV) += sata_mv.o
obj-$(CONFIG_SATA_NV) += sata_nv.o
obj-$(CONFIG_SATA_PROMISE) += sata_promise.o
+obj-$(CONFIG_SATA_RCAR) += sata_rcar.o
obj-$(CONFIG_SATA_SIL) += sata_sil.o
obj-$(CONFIG_SATA_SIS) += sata_sis.o
obj-$(CONFIG_SATA_SVW) += sata_svw.o
diff --git a/drivers/ata/sata_rcar.c b/drivers/ata/sata_rcar.c
new file mode 100644
index 0000000..caf33f6
--- /dev/null
+++ b/drivers/ata/sata_rcar.c
@@ -0,0 +1,910 @@
+/*
+ * Renesas R-Car SATA driver
+ *
+ * Author: Vladimir Barinov <source@cogentembedded.com>
+ * Copyright (C) 2013 Cogent Embedded, Inc.
+ * Copyright (C) 2013 Renesas Solutions Corp.
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/ata.h>
+#include <linux/libata.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+
+#define DRV_NAME "sata_rcar"
+
+/* SH-Navi2G/ATAPI-ATA compatible task registers */
+#define DATA_REG 0x100
+#define SDEVCON_REG 0x138
+
+/* SH-Navi2G/ATAPI module compatible control registers */
+#define ATAPI_CONTROL1_REG 0x180
+#define ATAPI_STATUS_REG 0x184
+#define ATAPI_INT_ENABLE_REG 0x188
+#define ATAPI_DTB_ADR_REG 0x198
+#define ATAPI_DMA_START_ADR_REG 0x19C
+#define ATAPI_DMA_TRANS_CNT_REG 0x1A0
+#define ATAPI_CONTROL2_REG 0x1A4
+#define ATAPI_SIG_ST_REG 0x1B0
+#define ATAPI_BYTE_SWAP_REG 0x1BC
+
+/* ATAPI control 1 register (ATAPI_CONTROL1) bits */
+#define ATAPI_CONTROL1_ISM BIT(16)
+#define ATAPI_CONTROL1_DTA32M BIT(11)
+#define ATAPI_CONTROL1_RESET BIT(7)
+#define ATAPI_CONTROL1_DESE BIT(3)
+#define ATAPI_CONTROL1_RW BIT(2)
+#define ATAPI_CONTROL1_STOP BIT(1)
+#define ATAPI_CONTROL1_START BIT(0)
+
+/* ATAPI status register (ATAPI_STATUS) bits */
+#define ATAPI_STATUS_SATAINT BIT(11)
+#define ATAPI_STATUS_DNEND BIT(6)
+#define ATAPI_STATUS_DEVTRM BIT(5)
+#define ATAPI_STATUS_DEVINT BIT(4)
+#define ATAPI_STATUS_ERR BIT(2)
+#define ATAPI_STATUS_NEND BIT(1)
+#define ATAPI_STATUS_ACT BIT(0)
+
+/* Interrupt enable register (ATAPI_INT_ENABLE) bits */
+#define ATAPI_INT_ENABLE_SATAINT BIT(11)
+#define ATAPI_INT_ENABLE_DNEND BIT(6)
+#define ATAPI_INT_ENABLE_DEVTRM BIT(5)
+#define ATAPI_INT_ENABLE_DEVINT BIT(4)
+#define ATAPI_INT_ENABLE_ERR BIT(2)
+#define ATAPI_INT_ENABLE_NEND BIT(1)
+#define ATAPI_INT_ENABLE_ACT BIT(0)
+
+/* Access control registers for physical layer control register */
+#define SATAPHYADDR_REG 0x200
+#define SATAPHYWDATA_REG 0x204
+#define SATAPHYACCEN_REG 0x208
+#define SATAPHYRESET_REG 0x20C
+#define SATAPHYRDATA_REG 0x210
+#define SATAPHYACK_REG 0x214
+
+/* Physical layer control address command register (SATAPHYADDR) bits */
+#define SATAPHYADDR_PHYRATEMODE BIT(10)
+#define SATAPHYADDR_PHYCMD_READ BIT(9)
+#define SATAPHYADDR_PHYCMD_WRITE BIT(8)
+
+/* Physical layer control enable register (SATAPHYACCEN) bits */
+#define SATAPHYACCEN_PHYLANE BIT(0)
+
+/* Physical layer control reset register (SATAPHYRESET) bits */
+#define SATAPHYRESET_PHYRST BIT(1)
+#define SATAPHYRESET_PHYSRES BIT(0)
+
+/* Physical layer control acknowledge register (SATAPHYACK) bits */
+#define SATAPHYACK_PHYACK BIT(0)
+
+/* Serial-ATA HOST control registers */
+#define BISTCONF_REG 0x102C
+#define SDATA_REG 0x1100
+#define SSDEVCON_REG 0x1204
+
+#define SCRSSTS_REG 0x1400
+#define SCRSERR_REG 0x1404
+#define SCRSCON_REG 0x1408
+#define SCRSACT_REG 0x140C
+
+#define SATAINTSTAT_REG 0x1508
+#define SATAINTMASK_REG 0x150C
+
+/* SATA INT status register (SATAINTSTAT) bits */
+#define SATAINTSTAT_SERR BIT(3)
+#define SATAINTSTAT_ATA BIT(0)
+
+/* SATA INT mask register (SATAINTSTAT) bits */
+#define SATAINTMASK_SERRMSK BIT(3)
+#define SATAINTMASK_ERRMSK BIT(2)
+#define SATAINTMASK_ERRCRTMSK BIT(1)
+#define SATAINTMASK_ATAMSK BIT(0)
+
+#define SATA_RCAR_INT_MASK (SATAINTMASK_SERRMSK | \
+ SATAINTMASK_ATAMSK)
+
+/* Physical Layer Control Registers */
+#define SATAPCTLR1_REG 0x43
+#define SATAPCTLR2_REG 0x52
+#define SATAPCTLR3_REG 0x5A
+#define SATAPCTLR4_REG 0x60
+
+/* Descriptor table word 0 bit (when DTA32M = 1) */
+#define SATA_RCAR_DTEND BIT(0)
+
+struct sata_rcar_priv {
+ void __iomem *base;
+ struct clk *clk;
+};
+
+static void sata_rcar_phy_initialize(struct sata_rcar_priv *priv)
+{
+ /* idle state */
+ iowrite32(0, priv->base + SATAPHYADDR_REG);
+ /* reset */
+ iowrite32(SATAPHYRESET_PHYRST, priv->base + SATAPHYRESET_REG);
+ udelay(10);
+ /* deassert reset */
+ iowrite32(0, priv->base + SATAPHYRESET_REG);
+}
+
+static void sata_rcar_phy_write(struct sata_rcar_priv *priv, u16 reg, u32 val,
+ int group)
+{
+ int timeout;
+
+ /* deassert reset */
+ iowrite32(0, priv->base + SATAPHYRESET_REG);
+ /* lane 1 */
+ iowrite32(SATAPHYACCEN_PHYLANE, priv->base + SATAPHYACCEN_REG);
+ /* write phy register value */
+ iowrite32(val, priv->base + SATAPHYWDATA_REG);
+ /* set register group */
+ if (group)
+ reg |= SATAPHYADDR_PHYRATEMODE;
+ /* write command */
+ iowrite32(SATAPHYADDR_PHYCMD_WRITE | reg, priv->base + SATAPHYADDR_REG);
+ /* wait for ack */
+ for (timeout = 0; timeout < 100; timeout++) {
+ val = ioread32(priv->base + SATAPHYACK_REG);
+ if (val & SATAPHYACK_PHYACK)
+ break;
+ }
+ if (timeout >= 100)
+ pr_err("%s timeout\n", __func__);
+ /* idle state */
+ iowrite32(0, priv->base + SATAPHYADDR_REG);
+}
+
+static void sata_rcar_freeze(struct ata_port *ap)
+{
+ struct sata_rcar_priv *priv = ap->host->private_data;
+
+ /* mask */
+ iowrite32(0x7ff, priv->base + SATAINTMASK_REG);
+
+ ata_sff_freeze(ap);
+}
+
+static void sata_rcar_thaw(struct ata_port *ap)
+{
+ struct sata_rcar_priv *priv = ap->host->private_data;
+
+ /* ack */
+ iowrite32(~SATA_RCAR_INT_MASK, priv->base + SATAINTSTAT_REG);
+
+ ata_sff_thaw(ap);
+
+ /* unmask */
+ iowrite32(0x7ff & ~SATA_RCAR_INT_MASK, priv->base + SATAINTMASK_REG);
+}
+
+static void sata_rcar_ioread16_rep(void __iomem *reg, void *buffer, int count)
+{
+ u16 *ptr = buffer;
+
+ while (count--) {
+ u16 data = ioread32(reg);
+
+ *ptr++ = data;
+ }
+}
+
+static void sata_rcar_iowrite16_rep(void __iomem *reg, void *buffer, int count)
+{
+ const u16 *ptr = buffer;
+
+ while (count--)
+ iowrite32(*ptr++, reg);
+}
+
+static u8 sata_rcar_check_status(struct ata_port *ap)
+{
+ return ioread32(ap->ioaddr.status_addr);
+}
+
+static u8 sata_rcar_check_altstatus(struct ata_port *ap)
+{
+ return ioread32(ap->ioaddr.altstatus_addr);
+}
+
+static void sata_rcar_set_devctl(struct ata_port *ap, u8 ctl)
+{
+ iowrite32(ctl, ap->ioaddr.ctl_addr);
+}
+
+static void sata_rcar_dev_select(struct ata_port *ap, unsigned int device)
+{
+ iowrite32(ATA_DEVICE_OBS, ap->ioaddr.device_addr);
+ ata_sff_pause(ap); /* needed; also flushes, for mmio */
+}
+
+static unsigned int sata_rcar_ata_devchk(struct ata_port *ap,
+ unsigned int device)
+{
+ struct ata_ioports *ioaddr = &ap->ioaddr;
+ u8 nsect, lbal;
+
+ sata_rcar_dev_select(ap, device);
+
+ iowrite32(0x55, ioaddr->nsect_addr);
+ iowrite32(0xaa, ioaddr->lbal_addr);
+
+ iowrite32(0xaa, ioaddr->nsect_addr);
+ iowrite32(0x55, ioaddr->lbal_addr);
+
+ iowrite32(0x55, ioaddr->nsect_addr);
+ iowrite32(0xaa, ioaddr->lbal_addr);
+
+ nsect = ioread32(ioaddr->nsect_addr);
+ lbal = ioread32(ioaddr->lbal_addr);
+
+ if (nsect == 0x55 && lbal == 0xaa)
+ return 1; /* found a device */
+
+ return 0; /* nothing found */
+}
+
+static int sata_rcar_wait_after_reset(struct ata_link *link,
+ unsigned long deadline)
+{
+ struct ata_port *ap = link->ap;
+
+ ata_msleep(ap, ATA_WAIT_AFTER_RESET);
+
+ return ata_sff_wait_ready(link, deadline);
+}
+
+static int sata_rcar_bus_softreset(struct ata_port *ap, unsigned long deadline)
+{
+ struct ata_ioports *ioaddr = &ap->ioaddr;
+
+ DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
+
+ /* software reset. causes dev0 to be selected */
+ iowrite32(ap->ctl, ioaddr->ctl_addr);
+ udelay(20);
+ iowrite32(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
+ udelay(20);
+ iowrite32(ap->ctl, ioaddr->ctl_addr);
+ ap->last_ctl = ap->ctl;
+
+ /* wait the port to become ready */
+ return sata_rcar_wait_after_reset(&ap->link, deadline);
+}
+
+static int sata_rcar_softreset(struct ata_link *link, unsigned int *classes,
+ unsigned long deadline)
+{
+ struct ata_port *ap = link->ap;
+ unsigned int devmask = 0;
+ int rc;
+ u8 err;
+
+ /* determine if device 0 is present */
+ if (sata_rcar_ata_devchk(ap, 0))
+ devmask |= 1 << 0;
+
+ /* issue bus reset */
+ DPRINTK("about to softreset, devmask=%x\n", devmask);
+ rc = sata_rcar_bus_softreset(ap, deadline);
+ /* if link is occupied, -ENODEV too is an error */
+ if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
+ ata_link_err(link, "SRST failed (errno=%d)\n", rc);
+ return rc;
+ }
+
+ /* determine by signature whether we have ATA or ATAPI devices */
+ classes[0] = ata_sff_dev_classify(&link->device[0], devmask, &err);
+
+ DPRINTK("classes[0]=%u\n", classes[0]);
+ return 0;
+}
+
+static void sata_rcar_tf_load(struct ata_port *ap,
+ const struct ata_taskfile *tf)
+{
+ struct ata_ioports *ioaddr = &ap->ioaddr;
+ unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+ if (tf->ctl != ap->last_ctl) {
+ iowrite32(tf->ctl, ioaddr->ctl_addr);
+ ap->last_ctl = tf->ctl;
+ ata_wait_idle(ap);
+ }
+
+ if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+ iowrite32(tf->hob_feature, ioaddr->feature_addr);
+ iowrite32(tf->hob_nsect, ioaddr->nsect_addr);
+ iowrite32(tf->hob_lbal, ioaddr->lbal_addr);
+ iowrite32(tf->hob_lbam, ioaddr->lbam_addr);
+ iowrite32(tf->hob_lbah, ioaddr->lbah_addr);
+ VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
+ tf->hob_feature,
+ tf->hob_nsect,
+ tf->hob_lbal,
+ tf->hob_lbam,
+ tf->hob_lbah);
+ }
+
+ if (is_addr) {
+ iowrite32(tf->feature, ioaddr->feature_addr);
+ iowrite32(tf->nsect, ioaddr->nsect_addr);
+ iowrite32(tf->lbal, ioaddr->lbal_addr);
+ iowrite32(tf->lbam, ioaddr->lbam_addr);
+ iowrite32(tf->lbah, ioaddr->lbah_addr);
+ VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
+ tf->feature,
+ tf->nsect,
+ tf->lbal,
+ tf->lbam,
+ tf->lbah);
+ }
+
+ if (tf->flags & ATA_TFLAG_DEVICE) {
+ iowrite32(tf->device, ioaddr->device_addr);
+ VPRINTK("device 0x%X\n", tf->device);
+ }
+
+ ata_wait_idle(ap);
+}
+
+static void sata_rcar_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+ struct ata_ioports *ioaddr = &ap->ioaddr;
+
+ tf->command = sata_rcar_check_status(ap);
+ tf->feature = ioread32(ioaddr->error_addr);
+ tf->nsect = ioread32(ioaddr->nsect_addr);
+ tf->lbal = ioread32(ioaddr->lbal_addr);
+ tf->lbam = ioread32(ioaddr->lbam_addr);
+ tf->lbah = ioread32(ioaddr->lbah_addr);
+ tf->device = ioread32(ioaddr->device_addr);
+
+ if (tf->flags & ATA_TFLAG_LBA48) {
+ iowrite32(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
+ tf->hob_feature = ioread32(ioaddr->error_addr);
+ tf->hob_nsect = ioread32(ioaddr->nsect_addr);
+ tf->hob_lbal = ioread32(ioaddr->lbal_addr);
+ tf->hob_lbam = ioread32(ioaddr->lbam_addr);
+ tf->hob_lbah = ioread32(ioaddr->lbah_addr);
+ iowrite32(tf->ctl, ioaddr->ctl_addr);
+ ap->last_ctl = tf->ctl;
+ }
+}
+
+static void sata_rcar_exec_command(struct ata_port *ap,
+ const struct ata_taskfile *tf)
+{
+ DPRINTK("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
+
+ iowrite32(tf->command, ap->ioaddr.command_addr);
+ ata_sff_pause(ap);
+}
+
+static unsigned int sata_rcar_data_xfer(struct ata_device *dev,
+ unsigned char *buf,
+ unsigned int buflen, int rw)
+{
+ struct ata_port *ap = dev->link->ap;
+ void __iomem *data_addr = ap->ioaddr.data_addr;
+ unsigned int words = buflen >> 1;
+
+ /* Transfer multiple of 2 bytes */
+ if (rw == READ)
+ sata_rcar_ioread16_rep(data_addr, buf, words);
+ else
+ sata_rcar_iowrite16_rep(data_addr, buf, words);
+
+ /* Transfer trailing byte, if any. */
+ if (unlikely(buflen & 0x01)) {
+ unsigned char pad[2] = { };
+
+ /* Point buf to the tail of buffer */
+ buf += buflen - 1;
+
+ /*
+ * Use io*16_rep() accessors here as well to avoid pointlessly
+ * swapping bytes to and from on the big endian machines...
+ */
+ if (rw == READ) {
+ sata_rcar_ioread16_rep(data_addr, pad, 1);
+ *buf = pad[0];
+ } else {
+ pad[0] = *buf;
+ sata_rcar_iowrite16_rep(data_addr, pad, 1);
+ }
+ words++;
+ }
+
+ return words << 1;
+}
+
+static void sata_rcar_drain_fifo(struct ata_queued_cmd *qc)
+{
+ int count;
+ struct ata_port *ap;
+
+ /* We only need to flush incoming data when a command was running */
+ if (qc == NULL || qc->dma_dir == DMA_TO_DEVICE)
+ return;
+
+ ap = qc->ap;
+ /* Drain up to 64K of data before we give up this recovery method */
+ for (count = 0; (ap->ops->sff_check_status(ap) & ATA_DRQ) &&
+ count < 65536; count += 2)
+ ioread32(ap->ioaddr.data_addr);
+
+ /* Can become DEBUG later */
+ if (count)
+ ata_port_dbg(ap, "drained %d bytes to clear DRQ\n", count);
+}
+
+static int sata_rcar_scr_read(struct ata_link *link, unsigned int sc_reg,
+ u32 *val)
+{
+ if (sc_reg > SCR_ACTIVE)
+ return -EINVAL;
+
+ *val = ioread32(link->ap->ioaddr.scr_addr + (sc_reg << 2));
+ return 0;
+}
+
+static int sata_rcar_scr_write(struct ata_link *link, unsigned int sc_reg,
+ u32 val)
+{
+ if (sc_reg > SCR_ACTIVE)
+ return -EINVAL;
+
+ iowrite32(val, link->ap->ioaddr.scr_addr + (sc_reg << 2));
+ return 0;
+}
+
+static void sata_rcar_bmdma_fill_sg(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct ata_bmdma_prd *prd = ap->bmdma_prd;
+ struct scatterlist *sg;
+ unsigned int si, pi;
+
+ pi = 0;
+ for_each_sg(qc->sg, sg, qc->n_elem, si) {
+ u32 addr, sg_len, len;
+
+ /*
+ * Note: h/w doesn't support 64-bit, so we unconditionally
+ * truncate dma_addr_t to u32.
+ */
+ addr = (u32)sg_dma_address(sg);
+ sg_len = sg_dma_len(sg);
+
+ /* H/w transfer count is only 29 bits long, let's be careful */
+ while (sg_len) {
+ len = sg_len;
+ if (len > 0x1ffffffe)
+ len = 0x1ffffffe;
+
+ prd[pi].addr = cpu_to_le32(addr);
+ prd[pi].flags_len = cpu_to_le32(len);
+ VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", pi, addr, len);
+
+ pi++;
+ sg_len -= len;
+ addr += len;
+ }
+ }
+
+ /* end-of-table flag */
+ prd[pi - 1].addr |= cpu_to_le32(SATA_RCAR_DTEND);
+}
+
+static void sata_rcar_qc_prep(struct ata_queued_cmd *qc)
+{
+ if (!(qc->flags & ATA_QCFLAG_DMAMAP))
+ return;
+
+ sata_rcar_bmdma_fill_sg(qc);
+}
+
+static void sata_rcar_bmdma_setup(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ unsigned int rw = qc->tf.flags & ATA_TFLAG_WRITE;
+ u32 dmactl;
+ struct sata_rcar_priv *priv = ap->host->private_data;
+
+ /* load PRD table addr. */
+ mb(); /* make sure PRD table writes are visible to controller */
+ iowrite32(ap->bmdma_prd_dma, priv->base + ATAPI_DTB_ADR_REG);
+
+ /* specify data direction, triple-check start bit is clear */
+ dmactl = ioread32(priv->base + ATAPI_CONTROL1_REG);
+ dmactl &= ~(ATAPI_CONTROL1_RW | ATAPI_CONTROL1_STOP);
+ if (dmactl & ATAPI_CONTROL1_START) {
+ dmactl &= ~ATAPI_CONTROL1_START;
+ dmactl |= ATAPI_CONTROL1_STOP;
+ }
+ if (!rw)
+ dmactl |= ATAPI_CONTROL1_RW;
+ iowrite32(dmactl, priv->base + ATAPI_CONTROL1_REG);
+
+ /* issue r/w command */
+ ap->ops->sff_exec_command(ap, &qc->tf);
+}
+
+static void sata_rcar_bmdma_start(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ u32 dmactl;
+ struct sata_rcar_priv *priv = ap->host->private_data;
+
+ /* start host DMA transaction */
+ dmactl = ioread32(priv->base + ATAPI_CONTROL1_REG);
+ dmactl |= ATAPI_CONTROL1_START;
+ iowrite32(dmactl, priv->base + ATAPI_CONTROL1_REG);
+}
+
+static void sata_rcar_bmdma_stop(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct sata_rcar_priv *priv = ap->host->private_data;
+ u32 dmactl;
+
+ /* force termination of DMA transfer if active */
+ dmactl = ioread32(priv->base + ATAPI_CONTROL1_REG);
+ if (dmactl & ATAPI_CONTROL1_START) {
+ dmactl &= ~ATAPI_CONTROL1_START;
+ dmactl |= ATAPI_CONTROL1_STOP;
+ iowrite32(dmactl, priv->base + ATAPI_CONTROL1_REG);
+ }
+
+ /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
+ ata_sff_dma_pause(ap);
+}
+
+static u8 sata_rcar_bmdma_status(struct ata_port *ap)
+{
+ struct sata_rcar_priv *priv = ap->host->private_data;
+ u32 status;
+ u8 host_stat = 0;
+
+ status = ioread32(priv->base + ATAPI_STATUS_REG);
+ if (status & ATAPI_STATUS_DEVINT)
+ host_stat |= ATA_DMA_INTR;
+ if (status & ATAPI_STATUS_ACT)
+ host_stat |= ATA_DMA_ACTIVE;
+
+ return host_stat;
+}
+
+static struct scsi_host_template sata_rcar_sht = {
+ ATA_BMDMA_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations sata_rcar_port_ops = {
+ .inherits = &ata_bmdma_port_ops,
+
+ .freeze = sata_rcar_freeze,
+ .thaw = sata_rcar_thaw,
+ .softreset = sata_rcar_softreset,
+
+ .scr_read = sata_rcar_scr_read,
+ .scr_write = sata_rcar_scr_write,
+
+ .sff_dev_select = sata_rcar_dev_select,
+ .sff_set_devctl = sata_rcar_set_devctl,
+ .sff_check_status = sata_rcar_check_status,
+ .sff_check_altstatus = sata_rcar_check_altstatus,
+ .sff_tf_load = sata_rcar_tf_load,
+ .sff_tf_read = sata_rcar_tf_read,
+ .sff_exec_command = sata_rcar_exec_command,
+ .sff_data_xfer = sata_rcar_data_xfer,
+ .sff_drain_fifo = sata_rcar_drain_fifo,
+
+ .qc_prep = sata_rcar_qc_prep,
+
+ .bmdma_setup = sata_rcar_bmdma_setup,
+ .bmdma_start = sata_rcar_bmdma_start,
+ .bmdma_stop = sata_rcar_bmdma_stop,
+ .bmdma_status = sata_rcar_bmdma_status,
+};
+
+static int sata_rcar_serr_interrupt(struct ata_port *ap)
+{
+ struct sata_rcar_priv *priv = ap->host->private_data;
+ struct ata_eh_info *ehi = &ap->link.eh_info;
+ int freeze = 0;
+ int handled = 0;
+ u32 serror;
+
+ serror = ioread32(priv->base + SCRSERR_REG);
+ if (!serror)
+ return 0;
+
+ DPRINTK("SError @host_intr: 0x%x\n", serror);
+
+ /* first, analyze and record host port events */
+ ata_ehi_clear_desc(ehi);
+
+ if (serror & (SERR_DEV_XCHG | SERR_PHYRDY_CHG)) {
+ /* Setup a soft-reset EH action */
+ ata_ehi_hotplugged(ehi);
+ ata_ehi_push_desc(ehi, "%s", "hotplug");
+
+ freeze = serror & SERR_COMM_WAKE ? 0 : 1;
+ handled = 1;
+ }
+
+ /* freeze or abort */
+ if (freeze)
+ ata_port_freeze(ap);
+ else
+ ata_port_abort(ap);
+
+ return handled;
+}
+
+static int sata_rcar_ata_interrupt(struct ata_port *ap)
+{
+ struct ata_queued_cmd *qc;
+ int handled = 0;
+
+ qc = ata_qc_from_tag(ap, ap->link.active_tag);
+ if (qc)
+ handled |= ata_bmdma_port_intr(ap, qc);
+
+ return handled;
+}
+
+static irqreturn_t sata_rcar_interrupt(int irq, void *dev_instance)
+{
+ struct ata_host *host = dev_instance;
+ struct sata_rcar_priv *priv = host->private_data;
+ struct ata_port *ap;
+ unsigned int handled = 0;
+ u32 sataintstat;
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ sataintstat = ioread32(priv->base + SATAINTSTAT_REG);
+ if (!sataintstat)
+ goto done;
+ /* ack */
+ iowrite32(sataintstat & ~SATA_RCAR_INT_MASK,
+ priv->base + SATAINTSTAT_REG);
+
+ ap = host->ports[0];
+
+ if (sataintstat & SATAINTSTAT_ATA)
+ handled |= sata_rcar_ata_interrupt(ap);
+
+ if (sataintstat & SATAINTSTAT_SERR)
+ handled |= sata_rcar_serr_interrupt(ap);
+
+done:
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ return IRQ_RETVAL(handled);
+}
+
+static void sata_rcar_setup_port(struct ata_host *host)
+{
+ struct ata_port *ap = host->ports[0];
+ struct ata_ioports *ioaddr = &ap->ioaddr;
+ struct sata_rcar_priv *priv = host->private_data;
+
+ ap->ops = &sata_rcar_port_ops;
+ ap->pio_mask = ATA_PIO4;
+ ap->udma_mask = ATA_UDMA6;
+ ap->flags |= ATA_FLAG_SATA;
+
+ ioaddr->cmd_addr = priv->base + SDATA_REG;
+ ioaddr->ctl_addr = priv->base + SSDEVCON_REG;
+ ioaddr->scr_addr = priv->base + SCRSSTS_REG;
+ ioaddr->altstatus_addr = ioaddr->ctl_addr;
+
+ ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
+ ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
+ ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
+ ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
+ ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
+ ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
+ ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
+ ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
+ ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
+ ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
+}
+
+static void sata_rcar_init_controller(struct ata_host *host)
+{
+ struct sata_rcar_priv *priv = host->private_data;
+ u32 val;
+
+ /* reset and setup phy */
+ sata_rcar_phy_initialize(priv);
+ sata_rcar_phy_write(priv, SATAPCTLR1_REG, 0x00200188, 0);
+ sata_rcar_phy_write(priv, SATAPCTLR1_REG, 0x00200188, 1);
+ sata_rcar_phy_write(priv, SATAPCTLR3_REG, 0x0000A061, 0);
+ sata_rcar_phy_write(priv, SATAPCTLR2_REG, 0x20000000, 0);
+ sata_rcar_phy_write(priv, SATAPCTLR2_REG, 0x20000000, 1);
+ sata_rcar_phy_write(priv, SATAPCTLR4_REG, 0x28E80000, 0);
+
+ /* SATA-IP reset state */
+ val = ioread32(priv->base + ATAPI_CONTROL1_REG);
+ val |= ATAPI_CONTROL1_RESET;
+ iowrite32(val, priv->base + ATAPI_CONTROL1_REG);
+
+ /* ISM mode, PRD mode, DTEND flag at bit 0 */
+ val = ioread32(priv->base + ATAPI_CONTROL1_REG);
+ val |= ATAPI_CONTROL1_ISM;
+ val |= ATAPI_CONTROL1_DESE;
+ val |= ATAPI_CONTROL1_DTA32M;
+ iowrite32(val, priv->base + ATAPI_CONTROL1_REG);
+
+ /* Release the SATA-IP from the reset state */
+ val = ioread32(priv->base + ATAPI_CONTROL1_REG);
+ val &= ~ATAPI_CONTROL1_RESET;
+ iowrite32(val, priv->base + ATAPI_CONTROL1_REG);
+
+ /* ack and mask */
+ iowrite32(0, priv->base + SATAINTSTAT_REG);
+ iowrite32(0x7ff, priv->base + SATAINTMASK_REG);
+ /* enable interrupts */
+ iowrite32(ATAPI_INT_ENABLE_SATAINT, priv->base + ATAPI_INT_ENABLE_REG);
+}
+
+static int sata_rcar_probe(struct platform_device *pdev)
+{
+ struct ata_host *host;
+ struct sata_rcar_priv *priv;
+ struct resource *mem;
+ int irq;
+ int ret = 0;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (mem == NULL)
+ return -EINVAL;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq <= 0)
+ return -EINVAL;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(struct sata_rcar_priv),
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(priv->clk)) {
+ dev_err(&pdev->dev, "failed to get access to sata clock\n");
+ return PTR_ERR(priv->clk);
+ }
+ clk_enable(priv->clk);
+
+ host = ata_host_alloc(&pdev->dev, 1);
+ if (!host) {
+ dev_err(&pdev->dev, "ata_host_alloc failed\n");
+ ret = -ENOMEM;
+ goto cleanup;
+ }
+
+ host->private_data = priv;
+
+ priv->base = devm_request_and_ioremap(&pdev->dev, mem);
+ if (!priv->base) {
+ ret = -EADDRNOTAVAIL;
+ goto cleanup;
+ }
+
+ /* setup port */
+ sata_rcar_setup_port(host);
+
+ /* initialize host controller */
+ sata_rcar_init_controller(host);
+
+ ret = ata_host_activate(host, irq, sata_rcar_interrupt, 0,
+ &sata_rcar_sht);
+ if (!ret)
+ return 0;
+
+cleanup:
+ clk_disable(priv->clk);
+
+ return ret;
+}
+
+static int sata_rcar_remove(struct platform_device *pdev)
+{
+ struct ata_host *host = dev_get_drvdata(&pdev->dev);
+ struct sata_rcar_priv *priv = host->private_data;
+
+ ata_host_detach(host);
+
+ /* disable interrupts */
+ iowrite32(0, priv->base + ATAPI_INT_ENABLE_REG);
+ /* ack and mask */
+ iowrite32(0, priv->base + SATAINTSTAT_REG);
+ iowrite32(0x7ff, priv->base + SATAINTMASK_REG);
+
+ clk_disable(priv->clk);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int sata_rcar_suspend(struct device *dev)
+{
+ struct ata_host *host = dev_get_drvdata(dev);
+ struct sata_rcar_priv *priv = host->private_data;
+ int ret;
+
+ ret = ata_host_suspend(host, PMSG_SUSPEND);
+ if (!ret) {
+ /* disable interrupts */
+ iowrite32(0, priv->base + ATAPI_INT_ENABLE_REG);
+ /* mask */
+ iowrite32(0x7ff, priv->base + SATAINTMASK_REG);
+
+ clk_disable(priv->clk);
+ }
+
+ return ret;
+}
+
+static int sata_rcar_resume(struct device *dev)
+{
+ struct ata_host *host = dev_get_drvdata(dev);
+ struct sata_rcar_priv *priv = host->private_data;
+
+ clk_enable(priv->clk);
+
+ /* ack and mask */
+ iowrite32(0, priv->base + SATAINTSTAT_REG);
+ iowrite32(0x7ff, priv->base + SATAINTMASK_REG);
+ /* enable interrupts */
+ iowrite32(ATAPI_INT_ENABLE_SATAINT, priv->base + ATAPI_INT_ENABLE_REG);
+
+ ata_host_resume(host);
+
+ return 0;
+}
+
+static const struct dev_pm_ops sata_rcar_pm_ops = {
+ .suspend = sata_rcar_suspend,
+ .resume = sata_rcar_resume,
+};
+#endif
+
+static struct of_device_id sata_rcar_match[] = {
+ { .compatible = "renesas,rcar-sata", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sata_rcar_match);
+
+static struct platform_driver sata_rcar_driver = {
+ .probe = sata_rcar_probe,
+ .remove = sata_rcar_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = sata_rcar_match,
+#ifdef CONFIG_PM
+ .pm = &sata_rcar_pm_ops,
+#endif
+ },
+};
+
+module_platform_driver(sata_rcar_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Vladimir Barinov");
+MODULE_DESCRIPTION("Renesas R-Car SATA controller low level driver");