memstick: add support for 8-bit parallel mode

Newer MemoryStick (HG) cards and hosts support 8-bit parallel mode of
operation in addition to original 4-bit and 1-bit modes.

Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index e5356f9..557dbbb 100644 (file)
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -816,12 +816,13 @@ static int mspro_block_wait_for_ced(struct memstick_dev *card)
        return card->current_mrq.error;
 }
 
-static int mspro_block_switch_to_parallel(struct memstick_dev *card)
+static int mspro_block_set_interface(struct memstick_dev *card,
+                                    unsigned char sys_reg)
 {
        struct memstick_host *host = card->host;
        struct mspro_block_data *msb = memstick_get_drvdata(card);
        struct mspro_param_register param = {
-               .system = MEMSTICK_SYS_PAR4,
+               .system = sys_reg,
                .data_count = 0,
                .data_address = 0,
                .tpc_param = 0
@@ -833,41 +834,70 @@ static int mspro_block_switch_to_parallel(struct memstick_dev *card)
                          sizeof(param));
        memstick_new_req(host);
        wait_for_completion(&card->mrq_complete);
-       if (card->current_mrq.error)
-               return card->current_mrq.error;
+       return card->current_mrq.error;
+}
+
+static int mspro_block_switch_interface(struct memstick_dev *card)
+{
+       struct memstick_host *host = card->host;
+       struct mspro_block_data *msb = memstick_get_drvdata(card);
+       int rc = 0;
+
+       if (msb->caps & MEMSTICK_CAP_PAR4)
+               rc = mspro_block_set_interface(card, MEMSTICK_SYS_PAR4);
+       else
+               return 0;
+
+       if (rc) {
+               printk(KERN_WARNING
+                      "%s: could not switch to 4-bit mode, error %d\n",
+                      card->dev.bus_id, rc);
+               return 0;
+       }
 
        msb->system = MEMSTICK_SYS_PAR4;
        host->set_param(host, MEMSTICK_INTERFACE, MEMSTICK_PAR4);
+       printk(KERN_INFO "%s: switching to 4-bit parallel mode\n",
+              card->dev.bus_id);
+
+       if (msb->caps & MEMSTICK_CAP_PAR8) {
+               rc = mspro_block_set_interface(card, MEMSTICK_SYS_PAR8);
+
+               if (!rc) {
+                       msb->system = MEMSTICK_SYS_PAR8;
+                       host->set_param(host, MEMSTICK_INTERFACE,
+                                       MEMSTICK_PAR8);
+                       printk(KERN_INFO
+                              "%s: switching to 8-bit parallel mode\n",
+                              card->dev.bus_id);
+               } else
+                       printk(KERN_WARNING
+                              "%s: could not switch to 8-bit mode, error %d\n",
+                              card->dev.bus_id, rc);
+       }
 
        card->next_request = h_mspro_block_req_init;
        msb->mrq_handler = h_mspro_block_default;
        memstick_init_req(&card->current_mrq, MS_TPC_GET_INT, NULL, 1);
        memstick_new_req(card->host);
        wait_for_completion(&card->mrq_complete);
+       rc = card->current_mrq.error;
 
-       if (card->current_mrq.error) {
+       if (rc) {
+               printk(KERN_WARNING
+                      "%s: interface error, trying to fall back to serial\n",
+                      card->dev.bus_id);
                msb->system = MEMSTICK_SYS_SERIAL;
                host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
-               msleep(1000);
+               msleep(10);
                host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_ON);
                host->set_param(host, MEMSTICK_INTERFACE, MEMSTICK_SERIAL);
 
-               if (memstick_set_rw_addr(card))
-                       return card->current_mrq.error;
-
-               param.system = msb->system;
-
-               card->next_request = h_mspro_block_req_init;
-               msb->mrq_handler = h_mspro_block_default;
-               memstick_init_req(&card->current_mrq, MS_TPC_WRITE_REG, &param,
-                                 sizeof(param));
-               memstick_new_req(host);
-               wait_for_completion(&card->mrq_complete);
-
-               return -EFAULT;
+               rc = memstick_set_rw_addr(card);
+               if (!rc)
+                       rc = mspro_block_set_interface(card, msb->system);
        }
-
-       return 0;
+       return rc;
 }
 
 /* Memory allocated for attributes by this function should be freed by
@@ -1053,12 +1083,11 @@ static int mspro_block_init_card(struct memstick_dev *card)
                return -EIO;
 
        msb->caps = host->caps;
-       if (msb->caps & MEMSTICK_CAP_PAR4) {
-               if (mspro_block_switch_to_parallel(card))
-                       printk(KERN_WARNING "%s: could not switch to "
-                              "parallel interface\n", card->dev.bus_id);
-       }
+       rc = mspro_block_switch_interface(card);
+       if (rc)
+               return rc;
 
+       msleep(200);
        rc = mspro_block_wait_for_ced(card);
        if (rc)
                return rc;