mtd: nand: omap: Synchronize the access to the ECC engine

The AM335x Technical Reference Manual (spruh73j.pdf) says
"Because the ECC engine includes only one accumulation context,
it can be allocated to only one chip-select at a time ... "
(7.1.3.3.12.3). Since the commit 97a288ba2cfa ("ARM: omap2+:
gpmc-nand: Use dynamic platform_device_alloc()") gpmc-nand
driver supports multiple NAND flash devices connected to
the single controller.
Use global 'struct nand_hw_control' among multiple NAND
instances to synchronize the access to the single ECC Engine.

Tested with custom AM335x board using 2x NAND flash chips.

Signed-off-by: Rostislav Lisovy <lisovy@merica.cz>
Acked-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index b0f89d87de89594777121fbc81fc545e361c3a48..1ec0a1dbed3db0e1a0a87387f19e4f7565148c86 100644 (file)
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -144,8 +144,13 @@ static u_char bch8_vector[] = {0xf3, 0xdb, 0x14, 0x16, 0x8b, 0xd2, 0xbe, 0xcc,
        0xac, 0x6b, 0xff, 0x99, 0x7b};
 static u_char bch4_vector[] = {0x00, 0x6b, 0x31, 0xdd, 0x41, 0xbc, 0x10};
 
+/* Shared among all NAND instances to synchronize access to the ECC Engine */
+static struct nand_hw_control omap_gpmc_controller = {
+       .lock = __SPIN_LOCK_UNLOCKED(omap_gpmc_controller.lock),
+       .wq = __WAIT_QUEUE_HEAD_INITIALIZER(omap_gpmc_controller.wq),
+};
+
 struct omap_nand_info {
-       struct nand_hw_control          controller;
        struct omap_nand_platform_data  *pdata;
        struct mtd_info                 mtd;
        struct nand_chip                nand;
@@ -1685,9 +1690,6 @@ static int omap_nand_probe(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, info);
 
-       spin_lock_init(&info->controller.lock);
-       init_waitqueue_head(&info->controller.wq);
-
        info->pdev              = pdev;
        info->gpmc_cs           = pdata->cs;
        info->reg               = pdata->reg;
@@ -1707,7 +1709,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 
        info->phys_base = res->start;
 
-       nand_chip->controller = &info->controller;
+       nand_chip->controller = &omap_gpmc_controller;
 
        nand_chip->IO_ADDR_W = nand_chip->IO_ADDR_R;
        nand_chip->cmd_ctrl  = omap_hwcontrol;