[PATCH 05/12] usb: mtu3: support 36-bit DMA address

Chunfeng Yun
2017-09-27T10:58:34Z

add support for 36-bit DMA address

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
drivers/usb/mtu3/mtu3.h | 17 ++++++-
drivers/usb/mtu3/mtu3_core.c | 34 ++++++++++++-
drivers/usb/mtu3/mtu3_hw_regs.h | 10 ++++
drivers/usb/mtu3/mtu3_qmu.c | 102 ++++++++++++++++++++++++++++++++-------
4 files changed, 142 insertions(+), 21 deletions(-)

diff --git a/drivers/usb/mtu3/mtu3.h b/drivers/usb/mtu3/mtu3.h
index 2795294..ef2dc92 100644
--- a/drivers/usb/mtu3/mtu3.h
+++ b/drivers/usb/mtu3/mtu3.h
@@ -46,6 +46,9 @@
#define MU3D_EP_RXCR1(epnum) (U3D_RX1CSR1 + (((epnum) - 1) * 0x10))
#define MU3D_EP_RXCR2(epnum) (U3D_RX1CSR2 + (((epnum) - 1) * 0x10))

+#define USB_QMU_TQHIAR(epnum) (U3D_TXQHIAR1 + (((epnum) - 1) * 0x4))
+#define USB_QMU_RQHIAR(epnum) (U3D_RXQHIAR1 + (((epnum) - 1) * 0x4))
+
#define USB_QMU_RQCSR(epnum) (U3D_RXQCSR1 + (((epnum) - 1) * 0x10))
#define USB_QMU_RQSAR(epnum) (U3D_RXQSAR1 + (((epnum) - 1) * 0x10))
#define USB_QMU_RQCPR(epnum) (U3D_RXQCPR1 + (((epnum) - 1) * 0x10))
@@ -138,23 +141,33 @@ struct mtu3_fifo_info {
* Checksum value is calculated over the 16 bytes of the GPD by default;
* @data_buf_len (RX ONLY): This value indicates the length of
* the assigned data buffer
+ * @tx_ext_addr (TX ONLY): [3:0] are 4 extension bits of @buffer,
+ * [7:4] are 4 extension bits of @next_gpd
* @next_gpd: Physical address of the next GPD
* @buffer: Physical address of the data buffer
* @buf_len:
* (TX): This value indicates the length of the assigned data buffer
* (RX): The total length of data received
* @ext_len: reserved
+ * @rx_ext_addr(RX ONLY): [3:0] are 4 extension bits of @buffer,
+ * [7:4] are 4 extension bits of @next_gpd
* @ext_flag:
* bit5 (TX ONLY): Zero Length Packet (ZLP),
*/
struct qmu_gpd {
__u8 flag;
__u8 chksum;
- __le16 data_buf_len;
+ union {
+ __le16 data_buf_len;
+ __le16 tx_ext_addr;
+ };
__le32 next_gpd;
__le32 buffer;
__le16 buf_len;
- __u8 ext_len;
+ union {
+ __u8 ext_len;
+ __u8 rx_ext_addr;
+ };
__u8 ext_flag;
} __packed;

diff --git a/drivers/usb/mtu3/mtu3_core.c b/drivers/usb/mtu3/mtu3_core.c
index 9475798..cd4528f 100644
--- a/drivers/usb/mtu3/mtu3_core.c
+++ b/drivers/usb/mtu3/mtu3_core.c
@@ -17,6 +17,7 @@
*
*/

+#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
@@ -759,7 +760,31 @@ static void mtu3_hw_exit(struct mtu3 *mtu)
mtu3_mem_free(mtu);
}

-/*-------------------------------------------------------------------------*/
+/**
+ * we set 32-bit DMA mask by default, here check whether the controller
+ * supports 36-bit DMA or not, if it does, set 36-bit DMA mask.
+ */
+static int mtu3_set_dma_mask(struct mtu3 *mtu)
+{
+ struct device *dev = mtu->dev;
+ bool is_36bit = false;
+ int ret = 0;
+ u32 value;
+
+ value = mtu3_readl(mtu->mac_base, U3D_MISC_CTRL);
+ if (value & DMA_ADDR_36BIT) {
+ is_36bit = true;
+ ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(36));
+ /* If set 36-bit DMA mask fails, fall back to 32-bit DMA mask */
+ if (ret) {
+ is_36bit = false;
+ ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+ }
+ }
+ dev_info(dev, "dma mask: %s bits\n", is_36bit ? "36" : "32");
+
+ return ret;
+}

int ssusb_gadget_init(struct ssusb_mtk *ssusb)
{
@@ -820,6 +845,12 @@ int ssusb_gadget_init(struct ssusb_mtk *ssusb)
return ret;
}

+ ret = mtu3_set_dma_mask(mtu);
+ if (ret) {
+ dev_err(dev, "mtu3 set dma_mask failed:%d\n", ret);
+ goto dma_mask_err;
+ }
+
ret = devm_request_irq(dev, mtu->irq, mtu3_irq, 0, dev_name(dev), mtu);
if (ret) {
dev_err(dev, "request irq %d failed!\n", mtu->irq);
@@ -845,6 +876,7 @@ int ssusb_gadget_init(struct ssusb_mtk *ssusb)
gadget_err:
device_init_wakeup(dev, false);

+dma_mask_err:
irq_err:
mtu3_hw_exit(mtu);
ssusb->u3d = NULL;
diff --git a/drivers/usb/mtu3/mtu3_hw_regs.h b/drivers/usb/mtu3/mtu3_hw_regs.h
index 06b2966..b605975 100644
--- a/drivers/usb/mtu3/mtu3_hw_regs.h
+++ b/drivers/usb/mtu3/mtu3_hw_regs.h
@@ -58,6 +58,8 @@
#define U3D_QCR1 (SSUSB_DEV_BASE + 0x0404)
#define U3D_QCR2 (SSUSB_DEV_BASE + 0x0408)
#define U3D_QCR3 (SSUSB_DEV_BASE + 0x040C)
+#define U3D_TXQHIAR1 (SSUSB_DEV_BASE + 0x0484)
+#define U3D_RXQHIAR1 (SSUSB_DEV_BASE + 0x04C4)

#define U3D_TXQCSR1 (SSUSB_DEV_BASE + 0x0510)
#define U3D_TXQSAR1 (SSUSB_DEV_BASE + 0x0514)
@@ -189,6 +191,13 @@
#define QMU_RX_COZ(x) (BIT(16) << (x))
#define QMU_RX_ZLP(x) (BIT(0) << (x))

+/* U3D_TXQHIAR1 */
+/* U3D_RXQHIAR1 */
+#define QMU_LAST_DONE_PTR_HI(x) (((x) >> 16) & 0xf)
+#define QMU_CUR_GPD_ADDR_HI(x) (((x) >> 8) & 0xf)
+#define QMU_START_ADDR_HI_MSK GENMASK(3, 0)
+#define QMU_START_ADDR_HI(x) (((x) & 0xf) << 0)
+
/* U3D_TXQCSR1 */
/* U3D_RXQCSR1 */
#define QMU_Q_ACTIVE BIT(15)
@@ -225,6 +234,7 @@
#define CAP_TX_EP_NUM(x) ((x) & 0x1f)

/* U3D_MISC_CTRL */
+#define DMA_ADDR_36BIT BIT(31)
#define VBUS_ON BIT(1)
#define VBUS_FRC_EN BIT(0)

diff --git a/drivers/usb/mtu3/mtu3_qmu.c b/drivers/usb/mtu3/mtu3_qmu.c
index 7d9ba8a..10d8f60 100644
--- a/drivers/usb/mtu3/mtu3_qmu.c
+++ b/drivers/usb/mtu3/mtu3_qmu.c
@@ -40,7 +40,58 @@
#define GPD_FLAGS_IOC BIT(7)

#define GPD_EXT_FLAG_ZLP BIT(5)
+#define GPD_EXT_NGP(x) (((x) & 0xf) << 4)
+#define GPD_EXT_BUF(x) (((x) & 0xf) << 0)

+#define HILO_GEN64(hi, lo) (((u64)(hi) << 32) + (lo))
+#define HILO_DMA(hi, lo) \
+ ((dma_addr_t)HILO_GEN64((le32_to_cpu(hi)), (le32_to_cpu(lo))))
+
+static dma_addr_t read_txq_cur_addr(void __iomem *mbase, u8 epnum)
+{
+ u32 txcpr;
+ u32 txhiar;
+
+ txcpr = mtu3_readl(mbase, USB_QMU_TQCPR(epnum));
+ txhiar = mtu3_readl(mbase, USB_QMU_TQHIAR(epnum));
+
+ return HILO_DMA(QMU_CUR_GPD_ADDR_HI(txhiar), txcpr);
+}
+
+static dma_addr_t read_rxq_cur_addr(void __iomem *mbase, u8 epnum)
+{
+ u32 rxcpr;
+ u32 rxhiar;
+
+ rxcpr = mtu3_readl(mbase, USB_QMU_RQCPR(epnum));
+ rxhiar = mtu3_readl(mbase, USB_QMU_RQHIAR(epnum));
+
+ return HILO_DMA(QMU_CUR_GPD_ADDR_HI(rxhiar), rxcpr);
+}
+
+static void write_txq_start_addr(void __iomem *mbase, u8 epnum, dma_addr_t dma)
+{
+ u32 tqhiar;
+
+ mtu3_writel(mbase, USB_QMU_TQSAR(epnum),
+ cpu_to_le32(lower_32_bits(dma)));
+ tqhiar = mtu3_readl(mbase, USB_QMU_TQHIAR(epnum));
+ tqhiar &= ~QMU_START_ADDR_HI_MSK;
+ tqhiar |= QMU_START_ADDR_HI(upper_32_bits(dma));
+ mtu3_writel(mbase, USB_QMU_TQHIAR(epnum), tqhiar);
+}
+
+static void write_rxq_start_addr(void __iomem *mbase, u8 epnum, dma_addr_t dma)
+{
+ u32 rqhiar;
+
+ mtu3_writel(mbase, USB_QMU_RQSAR(epnum),
+ cpu_to_le32(lower_32_bits(dma)));
+ rqhiar = mtu3_readl(mbase, USB_QMU_RQHIAR(epnum));
+ rqhiar &= ~QMU_START_ADDR_HI_MSK;
+ rqhiar |= QMU_START_ADDR_HI(upper_32_bits(dma));
+ mtu3_writel(mbase, USB_QMU_RQHIAR(epnum), rqhiar);
+}

static struct qmu_gpd *gpd_dma_to_virt(struct mtu3_gpd_ring *ring,
dma_addr_t dma_addr)
@@ -193,21 +244,27 @@ static int mtu3_prepare_tx_gpd(struct mtu3_ep *mep, struct mtu3_request *mreq)
struct mtu3_gpd_ring *ring = &mep->gpd_ring;
struct qmu_gpd *gpd = ring->enqueue;
struct usb_request *req = &mreq->request;
+ dma_addr_t enq_dma;
+ u16 ext_addr;

/* set all fields to zero as default value */
memset(gpd, 0, sizeof(*gpd));

- gpd->buffer = cpu_to_le32((u32)req->dma);
+ gpd->buffer = cpu_to_le32(lower_32_bits(req->dma));
+ ext_addr = GPD_EXT_BUF(upper_32_bits(req->dma));
gpd->buf_len = cpu_to_le16(req->length);
gpd->flag |= GPD_FLAGS_IOC;

/* get the next GPD */
enq = advance_enq_gpd(ring);
- dev_dbg(mep->mtu->dev, "TX-EP%d queue gpd=%p, enq=%p\n",
- mep->epnum, gpd, enq);
+ enq_dma = gpd_virt_to_dma(ring, enq);
+ dev_dbg(mep->mtu->dev, "TX-EP%d queue gpd=%p, enq=%p, qdma=%llx\n",
+ mep->epnum, gpd, enq, enq_dma);

enq->flag &= ~GPD_FLAGS_HWO;
- gpd->next_gpd = cpu_to_le32((u32)gpd_virt_to_dma(ring, enq));
+ gpd->next_gpd = cpu_to_le32(lower_32_bits(enq_dma));
+ ext_addr |= GPD_EXT_NGP(upper_32_bits(enq_dma));
+ gpd->tx_ext_addr = cpu_to_le16(ext_addr);

if (req->zero)
gpd->ext_flag |= GPD_EXT_FLAG_ZLP;
@@ -226,21 +283,27 @@ static int mtu3_prepare_rx_gpd(struct mtu3_ep *mep, struct mtu3_request *mreq)
struct mtu3_gpd_ring *ring = &mep->gpd_ring;
struct qmu_gpd *gpd = ring->enqueue;
struct usb_request *req = &mreq->request;
+ dma_addr_t enq_dma;
+ u16 ext_addr;

/* set all fields to zero as default value */
memset(gpd, 0, sizeof(*gpd));

- gpd->buffer = cpu_to_le32((u32)req->dma);
+ gpd->buffer = cpu_to_le32(lower_32_bits(req->dma));
+ ext_addr = GPD_EXT_BUF(upper_32_bits(req->dma));
gpd->data_buf_len = cpu_to_le16(req->length);
gpd->flag |= GPD_FLAGS_IOC;

/* get the next GPD */
enq = advance_enq_gpd(ring);
- dev_dbg(mep->mtu->dev, "RX-EP%d queue gpd=%p, enq=%p\n",
- mep->epnum, gpd, enq);
+ enq_dma = gpd_virt_to_dma(ring, enq);
+ dev_dbg(mep->mtu->dev, "RX-EP%d queue gpd=%p, enq=%p, qdma=%llx\n",
+ mep->epnum, gpd, enq, enq_dma);

enq->flag &= ~GPD_FLAGS_HWO;
- gpd->next_gpd = cpu_to_le32((u32)gpd_virt_to_dma(ring, enq));
+ gpd->next_gpd = cpu_to_le32(lower_32_bits(enq_dma));
+ ext_addr |= GPD_EXT_NGP(upper_32_bits(enq_dma));
+ gpd->rx_ext_addr = cpu_to_le16(ext_addr);
gpd->chksum = qmu_calc_checksum((u8 *)gpd);
gpd->flag |= GPD_FLAGS_HWO;

@@ -267,8 +330,8 @@ int mtu3_qmu_start(struct mtu3_ep *mep)

if (mep->is_in) {
/* set QMU start address */
- mtu3_writel(mbase, USB_QMU_TQSAR(mep->epnum), ring->dma);
- mtu3_setbits(mbase, MU3D_EP_TXCR0(mep->epnum), TX_DMAREQEN);
+ write_txq_start_addr(mbase, epnum, ring->dma);
+ mtu3_setbits(mbase, MU3D_EP_TXCR0(epnum), TX_DMAREQEN);
mtu3_setbits(mbase, U3D_QCR0, QMU_TX_CS_EN(epnum));
/* send zero length packet according to ZLP flag in GPD */
mtu3_setbits(mbase, U3D_QCR1, QMU_TX_ZLP(epnum));
@@ -282,8 +345,8 @@ int mtu3_qmu_start(struct mtu3_ep *mep)
mtu3_writel(mbase, USB_QMU_TQCSR(epnum), QMU_Q_START);

} else {
- mtu3_writel(mbase, USB_QMU_RQSAR(mep->epnum), ring->dma);
- mtu3_setbits(mbase, MU3D_EP_RXCR0(mep->epnum), RX_DMAREQEN);
+ write_rxq_start_addr(mbase, epnum, ring->dma);
+ mtu3_setbits(mbase, MU3D_EP_RXCR0(epnum), RX_DMAREQEN);
mtu3_setbits(mbase, U3D_QCR0, QMU_RX_CS_EN(epnum));
/* don't expect ZLP */
mtu3_clrbits(mbase, U3D_QCR3, QMU_RX_ZLP(epnum));
@@ -353,9 +416,9 @@ static void qmu_tx_zlp_error_handler(struct mtu3 *mtu, u8 epnum)
struct mtu3_gpd_ring *ring = &mep->gpd_ring;
void __iomem *mbase = mtu->mac_base;
struct qmu_gpd *gpd_current = NULL;
- dma_addr_t gpd_dma = mtu3_readl(mbase, USB_QMU_TQCPR(epnum));
struct usb_request *req = NULL;
struct mtu3_request *mreq;
+ dma_addr_t cur_gpd_dma;
u32 txcsr = 0;
int ret;

@@ -365,7 +428,8 @@ static void qmu_tx_zlp_error_handler(struct mtu3 *mtu, u8 epnum)
else
return;

- gpd_current = gpd_dma_to_virt(ring, gpd_dma);
+ cur_gpd_dma = read_txq_cur_addr(mbase, epnum);
+ gpd_current = gpd_dma_to_virt(ring, cur_gpd_dma);

if (le16_to_cpu(gpd_current->buf_len) != 0) {
dev_err(mtu->dev, "TX EP%d buffer length error(!=0)\n", epnum);
@@ -408,12 +472,13 @@ static void qmu_done_tx(struct mtu3 *mtu, u8 epnum)
void __iomem *mbase = mtu->mac_base;
struct qmu_gpd *gpd = ring->dequeue;
struct qmu_gpd *gpd_current = NULL;
- dma_addr_t gpd_dma = mtu3_readl(mbase, USB_QMU_TQCPR(epnum));
struct usb_request *request = NULL;
struct mtu3_request *mreq;
+ dma_addr_t cur_gpd_dma;

/*transfer phy address got from QMU register to virtual address */
- gpd_current = gpd_dma_to_virt(ring, gpd_dma);
+ cur_gpd_dma = read_txq_cur_addr(mbase, epnum);
+ gpd_current = gpd_dma_to_virt(ring, cur_gpd_dma);

dev_dbg(mtu->dev, "%s EP%d, last=%p, current=%p, enq=%p\n",
__func__, epnum, gpd, gpd_current, ring->enqueue);
@@ -446,11 +511,12 @@ static void qmu_done_rx(struct mtu3 *mtu, u8 epnum)
void __iomem *mbase = mtu->mac_base;
struct qmu_gpd *gpd = ring->dequeue;
struct qmu_gpd *gpd_current = NULL;
- dma_addr_t gpd_dma = mtu3_readl(mbase, USB_QMU_RQCPR(epnum));
struct usb_request *req = NULL;
struct mtu3_request *mreq;
+ dma_addr_t cur_gpd_dma;

- gpd_current = gpd_dma_to_virt(ring, gpd_dma);
+ cur_gpd_dma = read_rxq_cur_addr(mbase, epnum);
+ gpd_current = gpd_dma_to_virt(ring, cur_gpd_dma);

dev_dbg(mtu->dev, "%s EP%d, last=%p, current=%p, enq=%p\n",
__func__, epnum, gpd, gpd_current, ring->enqueue);
--
1.7.9.5