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spi-topcliff-pch: supports a spi mode setup and bit order setup by IO control
[pandora-kernel.git] / drivers / spi / spi-topcliff-pch.c
diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c
index 2a6429d..5a477e9 100644 (file)
--- a/drivers/spi/spi-topcliff-pch.c
+++ b/drivers/spi/spi-topcliff-pch.c
@@ -196,6 +196,7 @@ struct pch_spi_data {
        struct pch_spi_dma_ctrl dma;
        int use_dma;
        u8 irq_reg_sts;
+       int save_total_len;
 };
 
 /**
@@ -216,7 +217,7 @@ struct pch_pd_dev_save {
        struct pch_spi_board_data *board_dat;
 };
 
-static struct pci_device_id pch_spi_pcidev_id[] = {
+static DEFINE_PCI_DEVICE_TABLE(pch_spi_pcidev_id) = {
        { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_GE_SPI),    1, },
        { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_SPI), 2, },
        { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_SPI), 1, },
@@ -318,22 +319,23 @@ static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
                data->tx_index = tx_index;
                data->rx_index = rx_index;
 
-       }
-
-       /* if transfer complete interrupt */
-       if (reg_spsr_val & SPSR_FI_BIT) {
-               if ((tx_index == bpw_len) && (rx_index == tx_index)) {
-                       /* disable interrupts */
-                       pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
-
-                       /* transfer is completed;
-                          inform pch_spi_process_messages */
-                       data->transfer_complete = true;
-                       data->transfer_active = false;
-                       wake_up(&data->wait);
-               } else {
-                       dev_err(&data->master->dev,
-                               "%s : Transfer is not completed", __func__);
+               /* if transfer complete interrupt */
+               if (reg_spsr_val & SPSR_FI_BIT) {
+                       if ((tx_index == bpw_len) && (rx_index == tx_index)) {
+                               /* disable interrupts */
+                               pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
+                                                  PCH_ALL);
+
+                               /* transfer is completed;
+                                  inform pch_spi_process_messages */
+                               data->transfer_complete = true;
+                               data->transfer_active = false;
+                               wake_up(&data->wait);
+                       } else {
+                               dev_err(&data->master->dev,
+                                       "%s : Transfer is not completed",
+                                       __func__);
+                       }
                }
        }
 }
@@ -822,11 +824,13 @@ static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw)
                rx_dma_buf = data->dma.rx_buf_virt;
                for (j = 0; j < data->bpw_len; j++)
                        *rx_buf++ = *rx_dma_buf++ & 0xFF;
+               data->cur_trans->rx_buf = rx_buf;
        } else {
                rx_sbuf = data->cur_trans->rx_buf;
                rx_dma_sbuf = data->dma.rx_buf_virt;
                for (j = 0; j < data->bpw_len; j++)
                        *rx_sbuf++ = *rx_dma_sbuf++;
+               data->cur_trans->rx_buf = rx_sbuf;
        }
 }
 
@@ -852,6 +856,9 @@ static int pch_spi_start_transfer(struct pch_spi_data *data)
        rtn = wait_event_interruptible_timeout(data->wait,
                                               data->transfer_complete,
                                               msecs_to_jiffies(2 * HZ));
+       if (!rtn)
+               dev_err(&data->master->dev,
+                       "%s wait-event timeout\n", __func__);
 
        dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent,
                            DMA_FROM_DEVICE);
@@ -923,7 +930,8 @@ static void pch_spi_request_dma(struct pch_spi_data *data, int bpw)
        dma_cap_set(DMA_SLAVE, mask);
 
        /* Get DMA's dev information */
-       dma_dev = pci_get_bus_and_slot(2, PCI_DEVFN(12, 0));
+       dma_dev = pci_get_bus_and_slot(data->board_dat->pdev->bus->number,
+                                      PCI_DEVFN(12, 0));
 
        /* Set Tx DMA */
        param = &dma->param_tx;
@@ -987,6 +995,7 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
        int i;
        int size;
        int rem;
+       int head;
        unsigned long flags;
        struct pch_spi_dma_ctrl *dma;
 
@@ -1015,6 +1024,11 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
        }
        data->bpw_len = data->cur_trans->len / (*bpw / 8);
 
+       if (data->bpw_len > PCH_BUF_SIZE) {
+               data->bpw_len = PCH_BUF_SIZE;
+               data->cur_trans->len -= PCH_BUF_SIZE;
+       }
+
        /* copy Tx Data */
        if (data->cur_trans->tx_buf != NULL) {
                if (*bpw == 8) {
@@ -1029,10 +1043,17 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
                                *tx_dma_sbuf++ = *tx_sbuf++;
                }
        }
+
+       /* Calculate Rx parameter for DMA transmitting */
        if (data->bpw_len > PCH_DMA_TRANS_SIZE) {
-               num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;
+               if (data->bpw_len % PCH_DMA_TRANS_SIZE) {
+                       num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;
+                       rem = data->bpw_len % PCH_DMA_TRANS_SIZE;
+               } else {
+                       num = data->bpw_len / PCH_DMA_TRANS_SIZE;
+                       rem = PCH_DMA_TRANS_SIZE;
+               }
                size = PCH_DMA_TRANS_SIZE;
-               rem = data->bpw_len % PCH_DMA_TRANS_SIZE;
        } else {
                num = 1;
                size = data->bpw_len;
@@ -1092,15 +1113,23 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
        dma->nent = num;
        dma->desc_rx = desc_rx;
 
-       /* TX */
-       if (data->bpw_len > PCH_DMA_TRANS_SIZE) {
-               num = data->bpw_len / PCH_DMA_TRANS_SIZE;
+       /* Calculate Tx parameter for DMA transmitting */
+       if (data->bpw_len > PCH_MAX_FIFO_DEPTH) {
+               head = PCH_MAX_FIFO_DEPTH - PCH_DMA_TRANS_SIZE;
+               if (data->bpw_len % PCH_DMA_TRANS_SIZE > 4) {
+                       num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;
+                       rem = data->bpw_len % PCH_DMA_TRANS_SIZE - head;
+               } else {
+                       num = data->bpw_len / PCH_DMA_TRANS_SIZE;
+                       rem = data->bpw_len % PCH_DMA_TRANS_SIZE +
+                             PCH_DMA_TRANS_SIZE - head;
+               }
                size = PCH_DMA_TRANS_SIZE;
-               rem = 16;
        } else {
                num = 1;
                size = data->bpw_len;
                rem = data->bpw_len;
+               head = 0;
        }
 
        dma->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
@@ -1110,11 +1139,17 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
        for (i = 0; i < num; i++, sg++) {
                if (i == 0) {
                        sg->offset = 0;
+                       sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head,
+                                   sg->offset);
+                       sg_dma_len(sg) = size + head;
+               } else if (i == (num - 1)) {
+                       sg->offset = head + size * i;
+                       sg->offset = sg->offset * (*bpw / 8);
                        sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem,
                                    sg->offset);
                        sg_dma_len(sg) = rem;
                } else {
-                       sg->offset = rem + size * (i - 1);
+                       sg->offset = head + size * i;
                        sg->offset = sg->offset * (*bpw / 8);
                        sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size,
                                    sg->offset);
@@ -1202,6 +1237,7 @@ static void pch_spi_process_messages(struct work_struct *pwork)
                                    data->current_msg->spi->bits_per_word);
        pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL);
        do {
+               int cnt;
                /* If we are already processing a message get the next
                transfer structure from the message otherwise retrieve
                the 1st transfer request from the message. */
@@ -1221,11 +1257,20 @@ static void pch_spi_process_messages(struct work_struct *pwork)
                }
                spin_unlock(&data->lock);
 
+               if (!data->cur_trans->len)
+                       goto out;
+               cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1;
+               data->save_total_len = data->cur_trans->len;
                if (data->use_dma) {
-                       pch_spi_handle_dma(data, &bpw);
-                       if (!pch_spi_start_transfer(data))
-                               goto out;
-                       pch_spi_copy_rx_data_for_dma(data, bpw);
+                       int i;
+                       char *save_rx_buf = data->cur_trans->rx_buf;
+                       for (i = 0; i < cnt; i ++) {
+                               pch_spi_handle_dma(data, &bpw);
+                               if (!pch_spi_start_transfer(data))
+                                       goto out;
+                               pch_spi_copy_rx_data_for_dma(data, bpw);
+                       }
+                       data->cur_trans->rx_buf = save_rx_buf;
                } else {
                        pch_spi_set_tx(data, &bpw);
                        pch_spi_set_ir(data);
@@ -1236,6 +1281,7 @@ static void pch_spi_process_messages(struct work_struct *pwork)
                        data->pkt_tx_buff = NULL;
                }
                /* increment message count */
+               data->cur_trans->len = data->save_total_len;
                data->current_msg->actual_length += data->cur_trans->len;
 
                dev_dbg(&data->master->dev,
@@ -1388,6 +1434,7 @@ static int __devinit pch_spi_pd_probe(struct platform_device *plat_dev)
        master->num_chipselect = PCH_MAX_CS;
        master->setup = pch_spi_setup;
        master->transfer = pch_spi_transfer;
+       master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
 
        data->board_dat = board_dat;
        data->plat_dev = plat_dev;
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