Designware component type register is checked before attaching to the device.
Signed-off-by: Jean-Hugues Deschenes <jean-hugues.deschenes@xxxxxxxxxxx>
---
drivers/i2c/busses/i2c-designware.c | 11 +++++++++++
1 file changed, 11 insertions(+)
Index: linux-2.6_i2c/drivers/i2c/busses/i2c-designware.c
===================================================================
--- linux-2.6_i2c.orig/drivers/i2c/busses/i2c-designware.c
+++ linux-2.6_i2c/drivers/i2c/busses/i2c-designware.c
@@ -68,6 +68,7 @@
#define DW_IC_TXFLR 0x74
#define DW_IC_RXFLR 0x78
#define DW_IC_COMP_PARAM_1 0xf4
+#define DW_IC_COMP_TYPE 0xfc
#define DW_IC_TX_ABRT_SOURCE 0x80
#define DW_IC_CON_MASTER 0x1
@@ -756,6 +757,16 @@ static int __devinit dw_i2c_probe(struct
goto err_unuse_clocks;
}
{
+ u32 comp_type = dw_readl(dev, DW_IC_COMP_TYPE);
+
+ if (comp_type != 0x44570140) {
+ dev_err(&pdev->dev, "Unknown Synopsys component type: "
+ "0x%08x\n", comp_type);
+ r = -ENODEV;
+ goto err_iounmap;
+ }
+ }
+ {
u32 param1 = dw_readl(dev, DW_IC_COMP_PARAM_1);
dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;
--
--
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