GPMC has a writeprotect pin that can be connected to
peripherals. If any CS wants to enable writeprotect,
writeprotect will be enabled, once CS configurations
are finished.
Signed-off-by: Afzal Mohammed <afzal@xxxxxx>
---
arch/arm/mach-omap2/gpmc.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 98b52c3..eec011a 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -159,6 +159,7 @@ struct gpmc_peripheral {
static struct gpmc_peripheral gpmc_peripheral[GPMC_CS_NUM];
static unsigned gpmc_num_peripheral;
static unsigned gpmc_waitpin_map;
+static bool gpmc_writeprotect;
static struct gpmc_client_irq gpmc_client_irq[GPMC_NR_IRQ];
static struct irq_chip gpmc_irq_chip;
@@ -976,6 +977,9 @@ static void gpmc_setup_cs_config(unsigned cs, unsigned conf)
else if (conf & GPMC_CONFIG1_PAGE_LEN_16)
l |= GPMC_CONFIG1_PAGE_LEN_16;
+ if (conf & GPMC_CONFIG_WRITEPROTECT)
+ gpmc_writeprotect = true;
+
conf &= (GPMC_CONFIG1_MUXADDDATA |
GPMC_CONFIG1_WRITETYPE_SYNC |
GPMC_CONFIG1_WRITEMULTIPLE_SUPP |
@@ -1462,6 +1466,19 @@ int gpmc_cs_reconfigure(char *name, int id, struct gpmc_cs_data *c)
}
EXPORT_SYMBOL_GPL(gpmc_cs_reconfigure);
+static inline void gpmc_setup_writeprotect(void)
+{
+ u32 l;
+
+ l = gpmc_read_reg(GPMC_CONFIG);
+ if (gpmc_writeprotect == true) {
+ l &= ~GPMC_CONFIG_WRITEPROTECT;
+ dev_info(gpmc_dev, "write protect enabled\n");
+ } else
+ l |= GPMC_CONFIG_WRITEPROTECT;
+ gpmc_write_reg(GPMC_CONFIG, l);
+}
+
static __devinit int gpmc_probe(struct platform_device *pdev)
{
u32 l;
@@ -1521,6 +1538,8 @@ static __devinit int gpmc_probe(struct platform_device *pdev)
dev_err(gpmc_dev, "device creation on %s failed\n",
g_per->name);
+ gpmc_setup_writeprotect();
+
return 0;
}
@@ -1531,6 +1550,7 @@ static __exit int gpmc_remove(struct platform_device *pdev)
for (; gpmc_num_peripheral; g_per++, gpmc_num_peripheral--)
platform_device_unregister(g_per->pdev);
+ gpmc_writeprotect = false;
gpmc_waitpin_map = 0;
gpmc_free_irq();
gpmc_mem_exit();
--
1.7.10.2
--
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