+static void
+jme_spi_start(struct pci_dev *pdev, struct jme_spi_op *spiop)
+{
+ spiop->sr |= SPI_EN;
+ pci_write_config_byte(pdev, PCI_SPI, spiop->sr);
+ ndelay(spiop->halfclk << 2);
+ if (spiop->mode & SPI_MODE_CPOL) {
+ spiop->sr |= SPI_SCLK;
+ pci_write_config_byte(pdev, PCI_SPI, spiop->sr);
+ ndelay(spiop->halfclk << 2);
+ }
+ spiop->sr &= ~SPI_CS;
+ pci_write_config_byte(pdev, PCI_SPI, spiop->sr);
+ ndelay(spiop->halfclk);
+}
+
+static void
+jme_spi_write(struct pci_dev *pdev, struct jme_spi_op *spiop, u8 byte)
+{
+ int bit;
+
+ for (bit = 0 ; bit < 8 ; ++bit) {
+ if (byte & 0x80)
+ spiop->sr |= SPI_MOSI;
+ else
+ spiop->sr &= ~SPI_MOSI;
+ pci_write_config_byte(pdev, PCI_SPI, spiop->sr);
+
+ byte <<= 1;
+ ndelay(spiop->halfclk);
+ spiop->sr ^= SPI_SCLK;
+ pci_write_config_byte(pdev, PCI_SPI, spiop->sr);
+
+ ndelay(spiop->halfclk);
+ spiop->sr ^= SPI_SCLK;
+ pci_write_config_byte(pdev, PCI_SPI, spiop->sr);
+ }
+}
+
+static void
+jme_spi_read(struct pci_dev *pdev, struct jme_spi_op *spiop, u8 *byte)
+{
+ int bit;
+ u8 b;
+
+ spiop->sr &= ~SPI_MOSI;
+ for (bit = 0 ; bit < 8 ; ++bit) {
+ *byte <<= 1;
+ ndelay(spiop->halfclk);
+ spiop->sr ^= SPI_SCLK;
+ pci_write_config_byte(pdev, PCI_SPI, spiop->sr);
+
+ ndelay(spiop->halfclk);
+ pci_read_config_byte(pdev, PCI_SPI, &b);
+ *byte |= !!(b & SPI_MISO);
+ spiop->sr ^= SPI_SCLK;
+ pci_write_config_byte(pdev, PCI_SPI, spiop->sr);
+ }
+}
+
+static void
+jme_spi_stop(struct pci_dev *pdev, struct jme_spi_op *spiop)
+{
+ spiop->sr &= ~SPI_EN;
+ spiop->sr |= SPI_CS;
+ pci_write_config_byte(pdev, PCI_SPI, spiop->sr);
+}
+
+/**
+ * jme_spi_io - SPI Access helper function.
+ * @jme: Adapter informations
+ * @spiop: SPI operation.
+ *
+ * We have a SPI SW Access register in PCI configuration space,
+ * which directly connect to flash controller with SPI interface.
+ * This function is used to communicate with it in SPI protocol.
+ */
+static int
+jme_spi_op(struct jme_adapter *jme, struct jme_spi_op *spiop)
+{
+ int i;
+
+ /*
+ * Only support 8 bits for now
+ */
+ if (spiop->bitn != 8)
+ return -EINVAL;
+
+ /*
+ * Only support half-duplex for now
+ */
+ if (spiop->mode & SPI_MODE_DUP)
+ return -EINVAL;
+
+ spiop->halfclk = HALF_US / spiop->spd;
+ spiop->sr = SPI_CS;
+ jme_spi_start(jme->pdev, spiop);
+
+ for (i = 0 ; i < spiop->wn ; ++i)
+ jme_spi_write(jme->pdev, spiop, spiop->kwbuf[i]);
+
+ for (i = 0 ; i < spiop->rn ; ++i)
+ jme_spi_read(jme->pdev, spiop, spiop->krbuf + i);
+
+ jme_spi_stop(jme->pdev, spiop);
+
+ return 0;
+}
+
+static inline void