The Flexcard interface design split packet receive and transmit. All
received packets and card status information are multiplexed with a
Flexcard specific protocol and handled through a DMA capable ringbuffer.
The TX path has to poke each available component separate.
Add a platform device for the DMA receive channel.
Signed-off-by: Benedikt Spranger <b.spran...@linutronix.de>
Signed-off-by: Holger Dengler <deng...@linutronix.de>
cc: Lee Jones <lee.jo...@linaro.org>
---
drivers/mfd/flexcard_core.c | 67 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)
diff --git a/drivers/mfd/flexcard_core.c b/drivers/mfd/flexcard_core.c
index b7aead5..55bcfec 100644
--- a/drivers/mfd/flexcard_core.c
+++ b/drivers/mfd/flexcard_core.c
@@ -32,11 +32,41 @@
#define FLEXCARD_CLKRST_SIZE 0x3
#define FLEXCARD_NF_START 0x170
#define FLEXCARD_NF_SIZE 0x7
+#define FLEXCARD_DMA_START 0x500
+#define FLEXCARD_DMA_SIZE 0x80
#define FLEXCARD_CLK_START 0x700
#define FLEXCARD_CLK_SIZE 0x13
+#define FLEXCARD_DMA_IRQ_CO 0
+#define FLEXCARD_DMA_IRQ_TE 1
+#define FLEXCARD_DMA_IRQ_TI 2
+#define FLEXCARD_DMA_IRQ_CBL 3
+
+/* The first FW Version supporting DMA is 6.4.0 */
+#define DMA_MIN_FW_MAJOR 6
+#define DMA_MIN_FW_MINOR 4
+#define DMA_MIN_FW_UPDATE 0
+
static DEFINE_IDA(flexcard_ida);
+static struct resource flexcard_dma_res[] = {
+ DEFINE_RES_MEM_NAMED(FLEXCARD_DMA_START,
+ FLEXCARD_DMA_SIZE,
+ "flexcard-dma"),
+ DEFINE_RES_IRQ_NAMED(FLEXCARD_DMA_IRQ_CBL,
+ "flexcard-dma-cbl"),
+ DEFINE_RES_IRQ_NAMED(FLEXCARD_DMA_IRQ_CO,
+ "flexcard-dma-co"),
+};
+
+static struct mfd_cell flexcard_dma_dev[] = {
+ {
+ .name = "flexcard-dma",
+ .num_resources = ARRAY_SIZE(flexcard_dma_res),
+ .resources = flexcard_dma_res,
+ },
+};
+
static struct resource flexcard_clk_res[] = {
DEFINE_RES_MEM_NAMED(FLEXCARD_CLK_START,
FLEXCARD_CLK_SIZE,
@@ -102,6 +132,37 @@ static int flexcard_misc_setup(struct flexcard_device
*priv)
&pdev->resource[0], 0, NULL);
}
+static int flexcard_add_dma(struct flexcard_device *priv)
+{
+ struct pci_dev *pdev = priv->pdev;
+ union {
+ struct fc_version ver;
+ u32 reg;
+ } fw_ver;
+
+ /* check for a DMA capable firmware version*/
+ fw_ver.reg = readl(&priv->bar0->conf.fc_fw_ver);
+ if (fw_ver.ver.maj < DMA_MIN_FW_MAJOR)
+ goto out;
+
+ if (fw_ver.ver.maj == DMA_MIN_FW_MAJOR) {
+ if (fw_ver.ver.min < DMA_MIN_FW_MINOR)
+ goto out;
+ if ((fw_ver.ver.min == DMA_MIN_FW_MINOR) &&
+ (fw_ver.ver.dev < DMA_MIN_FW_UPDATE))
+ goto out;
+ }
+
+ return mfd_add_devices(&pdev->dev, 0, flexcard_dma_dev,
+ ARRAY_SIZE(flexcard_dma_dev),
+ &pdev->resource[0], 0, priv->dma_domain);
+
+out:
+ dev_info(&pdev->dev, "Firmware is not DMA capable\n");
+
+ return 0;
+}
+
static int flexcard_tiny_can(struct flexcard_device *priv,
int idx, int id, u32 offset)
{
@@ -267,6 +328,12 @@ static int flexcard_probe(struct pci_dev *pdev,
goto out_mfd_dev_remove;
}
+ ret = flexcard_add_dma(priv);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to add DMA device: %d", ret);
+ goto out_mfd_dev_remove;
+ }
+
dev_info(&pdev->dev, "HW %02x.%02x.%02x FW %02x.%02x.%02x\n",
hw_ver.ver.maj, hw_ver.ver.min, hw_ver.ver.dev,
fw_ver.ver.maj, fw_ver.ver.min, fw_ver.ver.dev);
--
2.1.4
