From: Alagu Sankar <alagusan...@embwise.com>
Added SDIO Support for Davinci Platforms. This is tested with DM355 and DM365
EVM platforms using Libertas driver with SD8686 and SD8688 SDIO WiFi cards.
There is a hack to support Libertas firmware download. This hack may not be
required for other SDIO cards.
Signed-off-by: alagusan...@embwise.com
---
drivers/mmc/host/davinci_mmc.c | 131 ++++++++++++++++++++++++++++++++++++----
1 files changed, 120 insertions(+), 11 deletions(-)
diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index 933cd42..2836ad1 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -32,6 +32,7 @@
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/mmc/mmc.h>
+#include <linux/mmc/card.h>
#include <mach/mmc.h>
#include <mach/edma.h>
@@ -66,8 +67,8 @@
#define DAVINCI_MMCBLNC 0x60
#define DAVINCI_SDIOCTL 0x64
#define DAVINCI_SDIOST0 0x68
-#define DAVINCI_SDIOEN 0x6C
-#define DAVINCI_SDIOST 0x70
+#define DAVINCI_SDIOIEN 0x6C
+#define DAVINCI_SDIOIST 0x70
#define DAVINCI_MMCFIFOCTL 0x74 /* FIFO Control Register */
/* DAVINCI_MMCCTL definitions */
@@ -135,6 +136,23 @@
/* MMCSD Init clock in Hz in opendrain mode */
#define MMCSD_INIT_CLOCK 200000
+/* DAVINCI_SDIOCTL definitions */
+#define SDIOCTL_RDWTRQ_SET BIT(0)
+#define SDIOCTL_RDWTCR_SET BIT(1)
+
+/* DAVINCI_SDIOST0 definitions */
+#define SDIOST0_DAT1_HI BIT(0)
+#define SDIOST0_INTPRD BIT(1)
+#define SDIOST0_RDWTST BIT(2)
+
+/* DAVINCI_SDIOIEN definitions */
+#define SDIOIEN_IOINTEN BIT(0)
+#define SDIOIEN_RWSEN BIT(1)
+
+/* DAVINCI_SDIOIST definitions */
+#define SDIOIST_IOINT BIT(0)
+#define SDIOIST_RWS BIT(1)
+
/*
* One scatterlist dma "segment" is at most MAX_CCNT rw_threshold units,
* and we handle up to NR_SG segments. MMC_BLOCK_BOUNCE kicks in only
@@ -147,6 +165,8 @@
#define NR_SG 16
+#define DAVINCI_SDIO_IRQ(dev_id) (((dev_id) == 0) ? "sdio0" : "sdio1")
+
static unsigned rw_threshold = 32;
module_param(rw_threshold, uint, S_IRUGO);
MODULE_PARM_DESC(rw_threshold,
@@ -164,7 +184,7 @@ struct mmc_davinci_host {
unsigned int mmc_input_clk;
void __iomem *base;
struct resource *mem_res;
- int irq;
+ int mmc_irq, sdio_irq;
unsigned char bus_mode;
#define DAVINCI_MMC_DATADIR_NONE 0
@@ -184,6 +204,7 @@ struct mmc_davinci_host {
u32 rxdma, txdma;
bool use_dma;
bool do_dma;
+ bool sdio_int;
/* Scatterlist DMA uses one or more parameter RAM entries:
* the main one (associated with rxdma or txdma) plus zero or
@@ -670,6 +691,24 @@ mmc_davinci_prepare_data(struct mmc_davinci_host *host,
struct mmc_request *req)
host->buffer = NULL;
host->bytes_left = data->blocks * data->blksz;
+ /*
+ * Hack for overcoming the 2ms delay required by Libertas helper
+ * firmware download. Without this delay the primary firmware load fails
+ * without an error. Not having the delay does not result in host
+ * controller error (or) helper firmware download error. But will result
+ * in primary firmware load error.
+ *
+ * May not be required for usage with other SDIO client drivers and
+ * should be removed after identifying the root cause in consultation
+ * with the libertas developers.
+ */
+ if (host->mmc->card) {
+ if (mmc_card_sdio(host->mmc->card)) {
+ if ((data->blksz == 64))
+ mdelay(2);
+ }
+ }
+
/* For now we try to use DMA whenever we won't need partial FIFO
* reads or writes, either for the whole transfer (as tested here)
* or for any individual scatterlist segment (tested when we call
@@ -862,6 +901,19 @@ mmc_davinci_xfer_done(struct mmc_davinci_host *host,
struct mmc_data *data)
{
host->data = NULL;
+ if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
+ /* SDIO Interrupt Detection work-around as suggested by
+ * Davinci Errata (TMS320DM355 Silicon Revision 1.1 Errata
+ * 2.1.5)
+ * Signal SDIO interrupt only if it is enabled by core
+ */
+ if (host->sdio_int && (!((readl(host->base + DAVINCI_SDIOST0))
+ & SDIOST0_DAT1_HI))) {
+ writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
+ mmc_signal_sdio_irq(host->mmc);
+ }
+ }
+
if (host->do_dma) {
davinci_abort_dma(host);
@@ -928,6 +980,22 @@ davinci_abort_data(struct mmc_davinci_host *host, struct
mmc_data *data)
mmc_davinci_reset_ctrl(host, 0);
}
+static irqreturn_t mmc_davinci_sdio_irq(int irq, void *dev_id)
+{
+ struct mmc_davinci_host *host = (struct mmc_davinci_host *)dev_id;
+ unsigned int status;
+
+ status = readl(host->base + DAVINCI_SDIOIST);
+ if (status & SDIOIST_IOINT) {
+ dev_dbg(mmc_dev(host->mmc),
+ "SDIO interrupt status %x\n", status);
+ writel(status | SDIOIST_IOINT,
+ host->base + DAVINCI_SDIOIST);
+ mmc_signal_sdio_irq(host->mmc);
+ }
+ return IRQ_HANDLED;
+}
+
static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
{
struct mmc_davinci_host *host = (struct mmc_davinci_host *)dev_id;
@@ -1072,11 +1140,33 @@ static int mmc_davinci_get_ro(struct mmc_host *mmc)
return config->get_ro(pdev->id);
}
+static void mmc_davinci_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ struct mmc_davinci_host *host = mmc_priv(mmc);
+
+ if (enable) {
+ if (!((readl(host->base + DAVINCI_SDIOST0))
+ & SDIOST0_DAT1_HI)) {
+ writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
+ mmc_signal_sdio_irq(host->mmc);
+ } else {
+ host->sdio_int = 1;
+ writel(readl(host->base + DAVINCI_SDIOIEN) |
+ SDIOIEN_IOINTEN, host->base + DAVINCI_SDIOIEN);
+ }
+ } else {
+ host->sdio_int = 0;
+ writel(readl(host->base + DAVINCI_SDIOIEN) & ~SDIOIEN_IOINTEN,
+ host->base + DAVINCI_SDIOIEN);
+ }
+
+}
static struct mmc_host_ops mmc_davinci_ops = {
- .request = mmc_davinci_request,
- .set_ios = mmc_davinci_set_ios,
- .get_cd = mmc_davinci_get_cd,
- .get_ro = mmc_davinci_get_ro,
+ .request = mmc_davinci_request,
+ .set_ios = mmc_davinci_set_ios,
+ .get_cd = mmc_davinci_get_cd,
+ .get_ro = mmc_davinci_get_ro,
+ .enable_sdio_irq = mmc_davinci_enable_sdio_irq,
};
/*----------------------------------------------------------------------*/
@@ -1199,7 +1289,8 @@ static int __init davinci_mmcsd_probe(struct
platform_device *pdev)
init_mmcsd_host(host);
host->use_dma = use_dma;
- host->irq = irq;
+ host->mmc_irq = irq;
+ host->sdio_irq = platform_get_irq(pdev, 1);
if (host->use_dma && davinci_acquire_dma_channels(host) != 0)
host->use_dma = 0;
@@ -1258,10 +1349,24 @@ static int __init davinci_mmcsd_probe(struct
platform_device *pdev)
if (ret < 0)
goto out;
- ret = request_irq(irq, mmc_davinci_irq, 0, mmc_hostname(mmc), host);
+ ret = request_irq(host->mmc_irq, mmc_davinci_irq, 0,
+ mmc_hostname(mmc), host);
if (ret)
goto out;
+ /* Failures in SDIO IRQ registration are ignored as the driver
+ * can still work in polled mode.
+ */
+ if (host->sdio_irq != NO_IRQ) {
+ ret = request_irq(host->sdio_irq,
+ mmc_davinci_sdio_irq, 0,
+ DAVINCI_SDIO_IRQ(pdev->id), host);
+ if (ret == 0) {
+ mmc->caps |= MMC_CAP_SDIO_IRQ;
+ host->sdio_int = 0;
+ }
+ }
+
rename_region(mem, mmc_hostname(mmc));
dev_info(mmc_dev(host->mmc), "Using %s, %d-bit mode\n",
@@ -1305,9 +1410,13 @@ static int __exit davinci_mmcsd_remove(struct
platform_device *pdev)
mmc_davinci_cpufreq_deregister(host);
mmc_remove_host(host->mmc);
- free_irq(host->irq, host);
+ free_irq(host->mmc_irq, host);
- davinci_release_dma_channels(host);
+ if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
+ free_irq(host->sdio_irq, host);
+
+ if (host->use_dma)
+ davinci_release_dma_channels(host);
clk_disable(host->clk);
clk_put(host->clk);
--
1.6.0.6
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