IB/hfi1: Fix dc8051 multiple qword memory reads
When reading multiple dc8051 data memory locations at once, the read enabled field must be toggled at every address change. Do that by writing only the address first, then writing the enable. Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Dean Luick <dean.luick@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
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@ -263,11 +263,13 @@ static int __read_8051_data(struct hfi1_devdata *dd, u32 addr, u64 *result)
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u64 reg;
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int count;
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/* start the read at the given address */
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reg = ((addr & DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_MASK)
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<< DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_SHIFT)
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| DC_DC8051_CFG_RAM_ACCESS_CTRL_READ_ENA_SMASK;
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/* step 1: set the address, clear enable */
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reg = (addr & DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_MASK)
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<< DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_SHIFT;
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write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_CTRL, reg);
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/* step 2: enable */
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write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_CTRL,
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reg | DC_DC8051_CFG_RAM_ACCESS_CTRL_READ_ENA_SMASK);
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/* wait until ACCESS_COMPLETED is set */
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count = 0;
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