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openwrt/target/linux/at91/patches-2.6.21/012-at91-mmcfix.patch

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--- linux-2.6.21.1.old/drivers/mmc/at91_mci.c 2007-06-05 09:08:57.000000000 +0200
+++ linux-2.6.21.1/drivers/mmc/at91_mci.c 2007-06-05 10:59:11.000000000 +0200
@@ -79,7 +79,8 @@
#define DRIVER_NAME "at91_mci"
-#undef SUPPORT_4WIRE
+//#undef SUPPORT_4WIRE
+#define SUPPORT_4WIRE
#define FL_SENT_COMMAND (1 << 0)
#define FL_SENT_STOP (1 << 1)
@@ -132,7 +133,7 @@
/*
* Copy from sg to a dma block - used for transfers
*/
-static inline void at91mci_sg_to_dma(struct at91mci_host *host, struct mmc_data *data)
+static inline void at91_mci_sg_to_dma(struct at91mci_host *host, struct mmc_data *data)
{
unsigned int len, i, size;
unsigned *dmabuf = host->buffer;
@@ -181,7 +182,7 @@
/*
* Prepare a dma read
*/
-static void at91mci_pre_dma_read(struct at91mci_host *host)
+static void at91_mci_pre_dma_read(struct at91mci_host *host)
{
int i;
struct scatterlist *sg;
@@ -249,23 +250,24 @@
/*
* Handle after a dma read
*/
-static void at91mci_post_dma_read(struct at91mci_host *host)
+static int at91_mci_post_dma_read(struct at91mci_host *host)
{
struct mmc_command *cmd;
struct mmc_data *data;
+ int completed = 0;
pr_debug("post dma read\n");
cmd = host->cmd;
if (!cmd) {
pr_debug("no command\n");
- return;
+ return 1;
}
data = cmd->data;
if (!data) {
pr_debug("no data\n");
- return;
+ return 1;
}
while (host->in_use_index < host->transfer_index) {
@@ -300,39 +302,14 @@
/* Is there another transfer to trigger? */
if (host->transfer_index < data->sg_len)
- at91mci_pre_dma_read(host);
+ at91_mci_pre_dma_read(host);
else {
+ at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_ENDRX);
at91_mci_write(host, AT91_MCI_IER, AT91_MCI_RXBUFF);
- at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
}
pr_debug("post dma read done\n");
-}
-
-/*
- * Handle transmitted data
- */
-static void at91_mci_handle_transmitted(struct at91mci_host *host)
-{
- struct mmc_command *cmd;
- struct mmc_data *data;
-
- pr_debug("Handling the transmit\n");
-
- /* Disable the transfer */
- at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
-
- /* Now wait for cmd ready */
- at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_TXBUFE);
- at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
-
- cmd = host->cmd;
- if (!cmd) return;
-
- data = cmd->data;
- if (!data) return;
-
- data->bytes_xfered = host->total_length;
+ return completed;
}
/*
@@ -340,10 +317,17 @@
*/
static void at91_mci_enable(struct at91mci_host *host)
{
+ unsigned int mr;
+
at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
at91_mci_write(host, AT91_MCI_DTOR, AT91_MCI_DTOMUL_1M | AT91_MCI_DTOCYC);
- at91_mci_write(host, AT91_MCI_MR, AT91_MCI_PDCMODE | 0x34a);
+ mr = AT91_MCI_PDCMODE | 0x34a;
+
+ if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
+ mr |= AT91_MCI_RDPROOF | AT91_MCI_WRPROOF;
+
+ at91_mci_write(host, AT91_MCI_MR, mr);
/* use Slot A or B (only one at same time) */
at91_mci_write(host, AT91_MCI_SDCR, host->board->slot_b);
@@ -359,9 +343,8 @@
/*
* Send a command
- * return the interrupts to enable
*/
-static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_command *cmd)
+static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command *cmd)
{
unsigned int cmdr, mr;
unsigned int block_length;
@@ -372,8 +355,7 @@
host->cmd = cmd;
- /* Not sure if this is needed */
-#if 0
+ /* Needed for leaving busy state before CMD1 */
if ((at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_RTOE) && (cmd->opcode == 1)) {
pr_debug("Clearing timeout\n");
at91_mci_write(host, AT91_MCI_ARGR, 0);
@@ -383,7 +365,7 @@
pr_debug("Clearing: SR = %08X\n", at91_mci_read(host, AT91_MCI_SR));
}
}
-#endif
+
cmdr = cmd->opcode;
if (mmc_resp_type(cmd) == MMC_RSP_NONE)
@@ -440,50 +422,48 @@
at91_mci_write(host, ATMEL_PDC_TCR, 0);
at91_mci_write(host, ATMEL_PDC_TNPR, 0);
at91_mci_write(host, ATMEL_PDC_TNCR, 0);
+ ier = AT91_MCI_CMDRDY;
+ } else {
+ /* zero block length in PDC mode */
+ mr = at91_mci_read(host, AT91_MCI_MR) & 0x7fff;
+ at91_mci_write(host, AT91_MCI_MR, mr | (block_length << 16) | AT91_MCI_PDCMODE);
+
+ /*
+ * Disable the PDC controller
+ */
+ at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
- at91_mci_write(host, AT91_MCI_ARGR, cmd->arg);
- at91_mci_write(host, AT91_MCI_CMDR, cmdr);
- return AT91_MCI_CMDRDY;
- }
-
- mr = at91_mci_read(host, AT91_MCI_MR) & 0x7fff; /* zero block length and PDC mode */
- at91_mci_write(host, AT91_MCI_MR, mr | (block_length << 16) | AT91_MCI_PDCMODE);
-
- /*
- * Disable the PDC controller
- */
- at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
-
- if (cmdr & AT91_MCI_TRCMD_START) {
- data->bytes_xfered = 0;
- host->transfer_index = 0;
- host->in_use_index = 0;
- if (cmdr & AT91_MCI_TRDIR) {
- /*
- * Handle a read
- */
- host->buffer = NULL;
- host->total_length = 0;
+ if (cmdr & AT91_MCI_TRCMD_START) {
+ data->bytes_xfered = 0;
+ host->transfer_index = 0;
+ host->in_use_index = 0;
+ if (cmdr & AT91_MCI_TRDIR) {
+ /*
+ * Handle a read
+ */
+ host->buffer = NULL;
+ host->total_length = 0;
- at91mci_pre_dma_read(host);
- ier = AT91_MCI_ENDRX /* | AT91_MCI_RXBUFF */;
- }
- else {
- /*
- * Handle a write
- */
- host->total_length = block_length * blocks;
- host->buffer = dma_alloc_coherent(NULL,
- host->total_length,
- &host->physical_address, GFP_KERNEL);
-
- at91mci_sg_to_dma(host, data);
-
- pr_debug("Transmitting %d bytes\n", host->total_length);
-
- at91_mci_write(host, ATMEL_PDC_TPR, host->physical_address);
- at91_mci_write(host, ATMEL_PDC_TCR, host->total_length / 4);
- ier = AT91_MCI_TXBUFE;
+ at91_mci_pre_dma_read(host);
+ ier = AT91_MCI_ENDRX /* | AT91_MCI_RXBUFF */;
+ }
+ else {
+ /*
+ * Handle a write
+ */
+ host->total_length = block_length * blocks;
+ host->buffer = dma_alloc_coherent(NULL,
+ host->total_length,
+ &host->physical_address, GFP_KERNEL);
+
+ at91_mci_sg_to_dma(host, data);
+
+ pr_debug("Transmitting %d bytes\n", host->total_length);
+
+ at91_mci_write(host, ATMEL_PDC_TPR, host->physical_address);
+ at91_mci_write(host, ATMEL_PDC_TCR, host->total_length / 4);
+ ier = AT91_MCI_CMDRDY;
+ }
}
}
@@ -498,39 +478,24 @@
if (cmdr & AT91_MCI_TRCMD_START) {
if (cmdr & AT91_MCI_TRDIR)
at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
- else
- at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
}
- return ier;
-}
-/*
- * Wait for a command to complete
- */
-static void at91mci_process_command(struct at91mci_host *host, struct mmc_command *cmd)
-{
- unsigned int ier;
-
- ier = at91_mci_send_command(host, cmd);
-
- pr_debug("setting ier to %08X\n", ier);
-
- /* Stop on errors or the required value */
+ /* Enable selected interrupts */
at91_mci_write(host, AT91_MCI_IER, AT91_MCI_ERRORS | ier);
}
/*
* Process the next step in the request
*/
-static void at91mci_process_next(struct at91mci_host *host)
+static void at91_mci_process_next(struct at91mci_host *host)
{
if (!(host->flags & FL_SENT_COMMAND)) {
host->flags |= FL_SENT_COMMAND;
- at91mci_process_command(host, host->request->cmd);
+ at91_mci_send_command(host, host->request->cmd);
}
else if ((!(host->flags & FL_SENT_STOP)) && host->request->stop) {
host->flags |= FL_SENT_STOP;
- at91mci_process_command(host, host->request->stop);
+ at91_mci_send_command(host, host->request->stop);
}
else
mmc_request_done(host->mmc, host->request);
@@ -539,7 +504,7 @@
/*
* Handle a command that has been completed
*/
-static void at91mci_completed_command(struct at91mci_host *host)
+static void at91_mci_completed_command(struct at91mci_host *host)
{
struct mmc_command *cmd = host->cmd;
unsigned int status;
@@ -583,7 +548,7 @@
else
cmd->error = MMC_ERR_NONE;
- at91mci_process_next(host);
+ at91_mci_process_next(host);
}
/*
@@ -595,7 +560,60 @@
host->request = mrq;
host->flags = 0;
- at91mci_process_next(host);
+ at91_mci_process_next(host);
+}
+
+/*
+ * Handle transmitted data
+ */
+static void at91_mci_handle_transmitted(struct at91mci_host *host)
+{
+ struct mmc_command *cmd;
+ struct mmc_data *data;
+
+ pr_debug("Handling the transmit\n");
+
+ /* Disable the transfer */
+ at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
+
+ /* Now wait for cmd ready */
+ at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_TXBUFE);
+
+ cmd = host->cmd;
+ if (!cmd) return;
+
+ data = cmd->data;
+ if (!data) return;
+
+ if (cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) {
+ pr_debug("multiple write : wait for BLKE...\n");
+ at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
+ } else
+ at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
+
+ data->bytes_xfered = host->total_length;
+}
+
+
+/*Handle after command sent ready*/
+static int at91_mci_handle_cmdrdy(struct at91mci_host *host)
+{
+ if (!host->cmd)
+ return 1;
+ else if (!host->cmd->data) {
+ if (host->flags & FL_SENT_STOP) {
+ /*After multi block write, we mus wait for NOTBUSY*/
+ at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
+ } else return 1;
+ } else if (host->cmd->data->flags & MMC_DATA_WRITE) {
+ /*After sending multi-block-write command, start DMA transfer*/
+ at91_mci_write(host, AT91_MCI_IER, AT91_MCI_TXBUFE);
+ at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
+ at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
+ }
+
+ /* command not completed, have to wait */
+ return 0;
}
/*
@@ -698,29 +716,33 @@
at91_mci_handle_transmitted(host);
}
+ if (int_status & AT91_MCI_ENDRX) {
+ pr_debug("ENDRX\n");
+ at91_mci_post_dma_read(host);
+ }
+
if (int_status & AT91_MCI_RXBUFF) {
pr_debug("RX buffer full\n");
- at91_mci_write(host, AT91_MCI_IER, AT91_MCI_CMDRDY);
+ at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
+ at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_RXBUFF | AT91_MCI_ENDRX);
+ completed = 1;
}
if (int_status & AT91_MCI_ENDTX)
pr_debug("Transmit has ended\n");
- if (int_status & AT91_MCI_ENDRX) {
- pr_debug("Receive has ended\n");
- at91mci_post_dma_read(host);
- }
-
if (int_status & AT91_MCI_NOTBUSY) {
pr_debug("Card is ready\n");
- at91_mci_write(host, AT91_MCI_IER, AT91_MCI_CMDRDY);
+ completed = 1;
}
if (int_status & AT91_MCI_DTIP)
pr_debug("Data transfer in progress\n");
- if (int_status & AT91_MCI_BLKE)
+ if (int_status & AT91_MCI_BLKE) {
pr_debug("Block transfer has ended\n");
+ completed = 1;
+ }
if (int_status & AT91_MCI_TXRDY)
pr_debug("Ready to transmit\n");
@@ -730,14 +752,14 @@
if (int_status & AT91_MCI_CMDRDY) {
pr_debug("Command ready\n");
- completed = 1;
+ completed = at91_mci_handle_cmdrdy(host);
}
}
if (completed) {
pr_debug("Completed command\n");
at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
- at91mci_completed_command(host);
+ at91_mci_completed_command(host);
} else
at91_mci_write(host, AT91_MCI_IDR, int_status);
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