As a part of the manufacturing process for some of our custom hardware, we are programming the EEPROMs attached to our Intel 82571EB controllers from software using U-Boot and Linux. This code provides several conditionally-compiled features to assist in our manufacturing process: CONFIG_CMD_E1000: This is a basic "e1000" command which allows querying the controller and (if other config options are set) performing EEPROM programming. In particular, with CONFIG_E1000_SPI this allows you to display a hex-dump of the EEPROM, copy to/from main memory, and verify/update the software checksum. CONFIG_E1000_SPI_GENERIC: Build a generic SPI driver providing the standard U-Boot SPI driver interface. This allows commands such as "sspi" to access the bus attached to the E1000 controller. Additionally, some E1000 chipsets can support user data in a reserved space in the E1000 EEPROM which could be used for U-Boot environment storage. CONFIG_E1000_SPI: The core SPI access code used by the above interfaces. For example, the following commands allow you to program the EEPROM from a USB device (assumes CONFIG_E1000_SPI and CONFIG_CMD_E1000 are enabled): usb start fatload usb 0 $loadaddr 82571EB_No_Mgmt_Discrete-LOM.bin e1000 0 spi program $loadaddr 0 1024 e1000 0 spi checksum update Please keep in mind that the Intel-provided .eep files are organized as 16-bit words. When converting them to binary form for programming you must byteswap each 16-bit word so that it is in little-endian form. This means that when reading and writing words to the SPI EEPROM, the bit ordering for each word looks like this on the wire: Time >>> ------------------------------------------------------------------ ... [7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8], ... ------------------------------------------------------------------ (MSB is 15, LSB is 0). Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Cc: Ben Warren <biggerbadderben@gmail.com>master
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#include "e1000.h" |
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|
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/*-----------------------------------------------------------------------
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* SPI transfer |
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* |
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* This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks |
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* "bitlen" bits in the SPI MISO port. That's just the way SPI works. |
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* |
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* The source of the outgoing bits is the "dout" parameter and the |
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* destination of the input bits is the "din" parameter. Note that "dout" |
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* and "din" can point to the same memory location, in which case the |
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* input data overwrites the output data (since both are buffered by |
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* temporary variables, this is OK). |
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* |
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* This may be interrupted with Ctrl-C if "intr" is true, otherwise it will |
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* never return an error. |
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*/ |
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static int e1000_spi_xfer(struct e1000_hw *hw, unsigned int bitlen, |
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const void *dout_mem, void *din_mem, boolean_t intr) |
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{ |
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const uint8_t *dout = dout_mem; |
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uint8_t *din = din_mem; |
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uint8_t mask = 0; |
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uint32_t eecd; |
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unsigned long i; |
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/* Pre-read the control register */ |
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eecd = E1000_READ_REG(hw, EECD); |
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|
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/* Iterate over each bit */ |
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for (i = 0, mask = 0x80; i < bitlen; i++, mask = (mask >> 1)?:0x80) { |
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/* Check for interrupt */ |
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if (intr && ctrlc()) |
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return -1; |
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|
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/* Determine the output bit */ |
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if (dout && dout[i >> 3] & mask) |
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eecd |= E1000_EECD_DI; |
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else |
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eecd &= ~E1000_EECD_DI; |
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|
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/* Write the output bit and wait 50us */ |
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E1000_WRITE_REG(hw, EECD, eecd); |
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E1000_WRITE_FLUSH(hw); |
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udelay(50); |
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|
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/* Poke the clock (waits 50us) */ |
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e1000_raise_ee_clk(hw, &eecd); |
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/* Now read the input bit */ |
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eecd = E1000_READ_REG(hw, EECD); |
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if (din) { |
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if (eecd & E1000_EECD_DO) |
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din[i >> 3] |= mask; |
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else |
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din[i >> 3] &= ~mask; |
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} |
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/* Poke the clock again (waits 50us) */ |
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e1000_lower_ee_clk(hw, &eecd); |
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} |
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/* Now clear any remaining bits of the input */ |
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if (din && (i & 7)) |
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din[i >> 3] &= ~((mask << 1) - 1); |
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return 0; |
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} |
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#ifdef CONFIG_E1000_SPI_GENERIC |
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static inline struct e1000_hw *e1000_hw_from_spi(struct spi_slave *spi) |
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{ |
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return container_of(spi, struct e1000_hw, spi); |
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} |
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|
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/* Not sure why all of these are necessary */ |
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void spi_init_r(void) { /* Nothing to do */ } |
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void spi_init_f(void) { /* Nothing to do */ } |
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void spi_init(void) { /* Nothing to do */ } |
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struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, |
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unsigned int max_hz, unsigned int mode) |
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{ |
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/* Find the right PCI device */ |
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struct e1000_hw *hw = e1000_find_card(bus); |
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if (!hw) { |
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printf("ERROR: No such e1000 device: e1000#%u\n", bus); |
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return NULL; |
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} |
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|
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/* Make sure it has an SPI chip */ |
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if (hw->eeprom.type != e1000_eeprom_spi) { |
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E1000_ERR(hw->nic, "No attached SPI EEPROM found!\n"); |
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return NULL; |
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} |
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/* Argument sanity checks */ |
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if (cs != 0) { |
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E1000_ERR(hw->nic, "No such SPI chip: %u\n", cs); |
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return NULL; |
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} |
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if (mode != SPI_MODE_0) { |
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E1000_ERR(hw->nic, "Only SPI MODE-0 is supported!\n"); |
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return NULL; |
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} |
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/* TODO: Use max_hz somehow */ |
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E1000_DBG(hw->nic, "EEPROM SPI access requested\n"); |
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return &hw->spi; |
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} |
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void spi_free_slave(struct spi_slave *spi) |
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{ |
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struct e1000_hw *hw = e1000_hw_from_spi(spi); |
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E1000_DBG(hw->nic, "EEPROM SPI access released\n"); |
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} |
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int spi_claim_bus(struct spi_slave *spi) |
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{ |
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struct e1000_hw *hw = e1000_hw_from_spi(spi); |
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if (e1000_acquire_eeprom(hw)) { |
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E1000_ERR(hw->nic, "EEPROM SPI cannot be acquired!\n"); |
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return -1; |
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} |
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return 0; |
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} |
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void spi_release_bus(struct spi_slave *spi) |
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{ |
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struct e1000_hw *hw = e1000_hw_from_spi(spi); |
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e1000_release_eeprom(hw); |
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} |
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/* Skinny wrapper around e1000_spi_xfer */ |
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int spi_xfer(struct spi_slave *spi, unsigned int bitlen, |
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const void *dout_mem, void *din_mem, unsigned long flags) |
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{ |
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struct e1000_hw *hw = e1000_hw_from_spi(spi); |
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int ret; |
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if (flags & SPI_XFER_BEGIN) |
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e1000_standby_eeprom(hw); |
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ret = e1000_spi_xfer(hw, bitlen, dout_mem, din_mem, TRUE); |
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if (flags & SPI_XFER_END) |
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e1000_standby_eeprom(hw); |
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return ret; |
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} |
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#endif /* not CONFIG_E1000_SPI_GENERIC */ |
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#ifdef CONFIG_CMD_E1000 |
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/* The EEPROM opcodes */ |
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#define SPI_EEPROM_ENABLE_WR 0x06 |
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#define SPI_EEPROM_DISABLE_WR 0x04 |
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#define SPI_EEPROM_WRITE_STATUS 0x01 |
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#define SPI_EEPROM_READ_STATUS 0x05 |
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#define SPI_EEPROM_WRITE_PAGE 0x02 |
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#define SPI_EEPROM_READ_PAGE 0x03 |
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/* The EEPROM status bits */ |
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#define SPI_EEPROM_STATUS_BUSY 0x01 |
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#define SPI_EEPROM_STATUS_WREN 0x02 |
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static int e1000_spi_eeprom_enable_wr(struct e1000_hw *hw, boolean_t intr) |
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{ |
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u8 op[] = { SPI_EEPROM_ENABLE_WR }; |
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e1000_standby_eeprom(hw); |
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return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr); |
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} |
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/*
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* These have been tested to perform correctly, but they are not used by any |
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* of the EEPROM commands at this time. |
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*/ |
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#if 0 |
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static int e1000_spi_eeprom_disable_wr(struct e1000_hw *hw, boolean_t intr) |
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{ |
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u8 op[] = { SPI_EEPROM_DISABLE_WR }; |
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e1000_standby_eeprom(hw); |
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return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr); |
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} |
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static int e1000_spi_eeprom_write_status(struct e1000_hw *hw, |
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u8 status, boolean_t intr) |
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{ |
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u8 op[] = { SPI_EEPROM_WRITE_STATUS, status }; |
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e1000_standby_eeprom(hw); |
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return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr); |
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} |
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#endif |
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static int e1000_spi_eeprom_read_status(struct e1000_hw *hw, boolean_t intr) |
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{ |
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u8 op[] = { SPI_EEPROM_READ_STATUS, 0 }; |
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e1000_standby_eeprom(hw); |
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if (e1000_spi_xfer(hw, 8*sizeof(op), op, op, intr)) |
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return -1; |
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return op[1]; |
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} |
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static int e1000_spi_eeprom_write_page(struct e1000_hw *hw, |
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const void *data, u16 off, u16 len, boolean_t intr) |
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{ |
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u8 op[] = { |
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SPI_EEPROM_WRITE_PAGE, |
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(off >> (hw->eeprom.address_bits - 8)) & 0xff, off & 0xff |
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}; |
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e1000_standby_eeprom(hw); |
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if (e1000_spi_xfer(hw, 8 + hw->eeprom.address_bits, op, NULL, intr)) |
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return -1; |
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if (e1000_spi_xfer(hw, len << 3, data, NULL, intr)) |
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return -1; |
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return 0; |
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} |
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static int e1000_spi_eeprom_read_page(struct e1000_hw *hw, |
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void *data, u16 off, u16 len, boolean_t intr) |
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{ |
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u8 op[] = { |
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SPI_EEPROM_READ_PAGE, |
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(off >> (hw->eeprom.address_bits - 8)) & 0xff, off & 0xff |
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}; |
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e1000_standby_eeprom(hw); |
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if (e1000_spi_xfer(hw, 8 + hw->eeprom.address_bits, op, NULL, intr)) |
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return -1; |
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if (e1000_spi_xfer(hw, len << 3, NULL, data, intr)) |
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return -1; |
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return 0; |
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} |
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static int e1000_spi_eeprom_poll_ready(struct e1000_hw *hw, boolean_t intr) |
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{ |
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int status; |
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while ((status = e1000_spi_eeprom_read_status(hw, intr)) >= 0) { |
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if (!(status & SPI_EEPROM_STATUS_BUSY)) |
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return 0; |
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} |
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return -1; |
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} |
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static int e1000_spi_eeprom_dump(struct e1000_hw *hw, |
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void *data, u16 off, unsigned int len, boolean_t intr) |
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{ |
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/* Interruptibly wait for the EEPROM to be ready */ |
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if (e1000_spi_eeprom_poll_ready(hw, intr)) |
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return -1; |
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/* Dump each page in sequence */ |
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while (len) { |
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/* Calculate the data bytes on this page */ |
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u16 pg_off = off & (hw->eeprom.page_size - 1); |
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u16 pg_len = hw->eeprom.page_size - pg_off; |
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if (pg_len > len) |
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pg_len = len; |
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/* Now dump the page */ |
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if (e1000_spi_eeprom_read_page(hw, data, off, pg_len, intr)) |
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return -1; |
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/* Otherwise go on to the next page */ |
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len -= pg_len; |
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off += pg_len; |
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data += pg_len; |
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} |
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/* We're done! */ |
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return 0; |
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} |
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static int e1000_spi_eeprom_program(struct e1000_hw *hw, |
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const void *data, u16 off, u16 len, boolean_t intr) |
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{ |
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/* Program each page in sequence */ |
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while (len) { |
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/* Calculate the data bytes on this page */ |
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u16 pg_off = off & (hw->eeprom.page_size - 1); |
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u16 pg_len = hw->eeprom.page_size - pg_off; |
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if (pg_len > len) |
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pg_len = len; |
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/* Interruptibly wait for the EEPROM to be ready */ |
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if (e1000_spi_eeprom_poll_ready(hw, intr)) |
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return -1; |
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/* Enable write access */ |
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if (e1000_spi_eeprom_enable_wr(hw, intr)) |
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return -1; |
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/* Now program the page */ |
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if (e1000_spi_eeprom_write_page(hw, data, off, pg_len, intr)) |
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return -1; |
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/* Otherwise go on to the next page */ |
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len -= pg_len; |
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off += pg_len; |
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data += pg_len; |
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} |
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/* Wait for the last write to complete */ |
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if (e1000_spi_eeprom_poll_ready(hw, intr)) |
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return -1; |
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/* We're done! */ |
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return 0; |
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} |
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static int do_e1000_spi_show(cmd_tbl_t *cmdtp, struct e1000_hw *hw, |
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int argc, char * const argv[]) |
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{ |
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unsigned int length = 0; |
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u16 i, offset = 0; |
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u8 *buffer; |
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int err; |
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if (argc > 2) { |
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cmd_usage(cmdtp); |
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return 1; |
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} |
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/* Parse the offset and length */ |
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if (argc >= 1) |
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offset = simple_strtoul(argv[0], NULL, 0); |
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if (argc == 2) |
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length = simple_strtoul(argv[1], NULL, 0); |
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else if (offset < (hw->eeprom.word_size << 1)) |
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length = (hw->eeprom.word_size << 1) - offset; |
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/* Extra sanity checks */ |
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if (!length) { |
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E1000_ERR(hw->nic, "Requested zero-sized dump!\n"); |
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return 1; |
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} |
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if ((0x10000 < length) || (0x10000 - length < offset)) { |
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E1000_ERR(hw->nic, "Can't dump past 0xFFFF!\n"); |
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return 1; |
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} |
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/* Allocate a buffer to hold stuff */ |
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buffer = malloc(length); |
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if (!buffer) { |
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E1000_ERR(hw->nic, "Out of Memory!\n"); |
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return 1; |
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} |
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/* Acquire the EEPROM and perform the dump */ |
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if (e1000_acquire_eeprom(hw)) { |
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E1000_ERR(hw->nic, "EEPROM SPI cannot be acquired!\n"); |
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free(buffer); |
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return 1; |
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} |
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err = e1000_spi_eeprom_dump(hw, buffer, offset, length, TRUE); |
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e1000_release_eeprom(hw); |
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if (err) { |
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E1000_ERR(hw->nic, "Interrupted!\n"); |
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free(buffer); |
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return 1; |
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} |
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/* Now hexdump the result */ |
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printf("%s: ===== Intel e1000 EEPROM (0x%04hX - 0x%04hX) =====", |
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hw->nic->name, offset, offset + length - 1); |
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for (i = 0; i < length; i++) { |
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if ((i & 0xF) == 0) |
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printf("\n%s: %04hX: ", hw->nic->name, offset + i); |
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else if ((i & 0xF) == 0x8) |
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printf(" "); |
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printf(" %02hx", buffer[i]); |
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} |
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printf("\n"); |
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/* Success! */ |
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free(buffer); |
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return 0; |
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} |
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static int do_e1000_spi_dump(cmd_tbl_t *cmdtp, struct e1000_hw *hw, |
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int argc, char * const argv[]) |
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{ |
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unsigned int length; |
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u16 offset; |
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void *dest; |
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if (argc != 3) { |
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cmd_usage(cmdtp); |
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return 1; |
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} |
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/* Parse the arguments */ |
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dest = (void *)simple_strtoul(argv[0], NULL, 16); |
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offset = simple_strtoul(argv[1], NULL, 0); |
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length = simple_strtoul(argv[2], NULL, 0); |
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/* Extra sanity checks */ |
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if (!length) { |
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E1000_ERR(hw->nic, "Requested zero-sized dump!\n"); |
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return 1; |
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} |
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if ((0x10000 < length) || (0x10000 - length < offset)) { |
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E1000_ERR(hw->nic, "Can't dump past 0xFFFF!\n"); |
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return 1; |
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} |
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/* Acquire the EEPROM */ |
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if (e1000_acquire_eeprom(hw)) { |
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E1000_ERR(hw->nic, "EEPROM SPI cannot be acquired!\n"); |
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return 1; |
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} |
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/* Perform the programming operation */ |
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if (e1000_spi_eeprom_dump(hw, dest, offset, length, TRUE) < 0) { |
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E1000_ERR(hw->nic, "Interrupted!\n"); |
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e1000_release_eeprom(hw); |
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return 1; |
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} |
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e1000_release_eeprom(hw); |
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printf("%s: ===== EEPROM DUMP COMPLETE =====\n", hw->nic->name); |
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return 0; |
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} |
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static int do_e1000_spi_program(cmd_tbl_t *cmdtp, struct e1000_hw *hw, |
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int argc, char * const argv[]) |
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{ |
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unsigned int length; |
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const void *source; |
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u16 offset; |
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if (argc != 3) { |
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cmd_usage(cmdtp); |
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return 1; |
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} |
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/* Parse the arguments */ |
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source = (const void *)simple_strtoul(argv[0], NULL, 16); |
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offset = simple_strtoul(argv[1], NULL, 0); |
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length = simple_strtoul(argv[2], NULL, 0); |
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/* Acquire the EEPROM */ |
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if (e1000_acquire_eeprom(hw)) { |
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E1000_ERR(hw->nic, "EEPROM SPI cannot be acquired!\n"); |
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return 1; |
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} |
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/* Perform the programming operation */ |
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if (e1000_spi_eeprom_program(hw, source, offset, length, TRUE) < 0) { |
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E1000_ERR(hw->nic, "Interrupted!\n"); |
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e1000_release_eeprom(hw); |
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return 1; |
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} |
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e1000_release_eeprom(hw); |
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printf("%s: ===== EEPROM PROGRAMMED =====\n", hw->nic->name); |
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return 0; |
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} |
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static int do_e1000_spi_checksum(cmd_tbl_t *cmdtp, struct e1000_hw *hw, |
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int argc, char * const argv[]) |
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{ |
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uint16_t i, length, checksum, checksum_reg; |
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uint16_t *buffer; |
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boolean_t upd; |
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if (argc == 0) |
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upd = 0; |
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else if ((argc == 1) && !strcmp(argv[0], "update")) |
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upd = 1; |
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else { |
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cmd_usage(cmdtp); |
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return 1; |
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} |
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/* Allocate a temporary buffer */ |
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length = sizeof(uint16_t) * (EEPROM_CHECKSUM_REG + 1); |
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buffer = malloc(length); |
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if (!buffer) { |
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E1000_ERR(hw->nic, "Unable to allocate EEPROM buffer!\n"); |
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return 1; |
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} |
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/* Acquire the EEPROM */ |
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if (e1000_acquire_eeprom(hw)) { |
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E1000_ERR(hw->nic, "EEPROM SPI cannot be acquired!\n"); |
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return 1; |
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} |
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/* Read the EEPROM */ |
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if (e1000_spi_eeprom_dump(hw, buffer, 0, length, TRUE) < 0) { |
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E1000_ERR(hw->nic, "Interrupted!\n"); |
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e1000_release_eeprom(hw); |
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return 1; |
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} |
||||
|
||||
/* Compute the checksum and read the expected value */ |
||||
for (i = 0; i < EEPROM_CHECKSUM_REG; i++) |
||||
checksum += le16_to_cpu(buffer[i]); |
||||
checksum = ((uint16_t)EEPROM_SUM) - checksum; |
||||
checksum_reg = le16_to_cpu(buffer[i]); |
||||
|
||||
/* Verify it! */ |
||||
if (checksum_reg == checksum) { |
||||
printf("%s: INFO: EEPROM checksum is correct! (0x%04hx)\n", |
||||
hw->nic->name, checksum); |
||||
e1000_release_eeprom(hw); |
||||
return 0; |
||||
} |
||||
|
||||
/* Hrm, verification failed, print an error */ |
||||
E1000_ERR(hw->nic, "EEPROM checksum is incorrect!\n"); |
||||
E1000_ERR(hw->nic, " ...register was 0x%04hx, calculated 0x%04hx\n", |
||||
checksum_reg, checksum); |
||||
|
||||
/* If they didn't ask us to update it, just return an error */ |
||||
if (!upd) { |
||||
e1000_release_eeprom(hw); |
||||
return 1; |
||||
} |
||||
|
||||
/* Ok, correct it! */ |
||||
printf("%s: Reprogramming the EEPROM checksum...\n", hw->nic->name); |
||||
buffer[i] = cpu_to_le16(checksum); |
||||
if (e1000_spi_eeprom_program(hw, &buffer[i], i * sizeof(uint16_t), |
||||
sizeof(uint16_t), TRUE)) { |
||||
E1000_ERR(hw->nic, "Interrupted!\n"); |
||||
e1000_release_eeprom(hw); |
||||
return 1; |
||||
} |
||||
|
||||
e1000_release_eeprom(hw); |
||||
return 0; |
||||
} |
||||
|
||||
int do_e1000_spi(cmd_tbl_t *cmdtp, struct e1000_hw *hw, |
||||
int argc, char * const argv[]) |
||||
{ |
||||
if (argc < 1) { |
||||
cmd_usage(cmdtp); |
||||
return 1; |
||||
} |
||||
|
||||
/* Make sure it has an SPI chip */ |
||||
if (hw->eeprom.type != e1000_eeprom_spi) { |
||||
E1000_ERR(hw->nic, "No attached SPI EEPROM found!\n"); |
||||
return 1; |
||||
} |
||||
|
||||
/* Check the eeprom sub-sub-command arguments */ |
||||
if (!strcmp(argv[0], "show")) |
||||
return do_e1000_spi_show(cmdtp, hw, argc - 1, argv + 1); |
||||
|
||||
if (!strcmp(argv[0], "dump")) |
||||
return do_e1000_spi_dump(cmdtp, hw, argc - 1, argv + 1); |
||||
|
||||
if (!strcmp(argv[0], "program")) |
||||
return do_e1000_spi_program(cmdtp, hw, argc - 1, argv + 1); |
||||
|
||||
if (!strcmp(argv[0], "checksum")) |
||||
return do_e1000_spi_checksum(cmdtp, hw, argc - 1, argv + 1); |
||||
|
||||
cmd_usage(cmdtp); |
||||
return 1; |
||||
} |
||||
|
||||
#endif /* not CONFIG_CMD_E1000 */ |
Loading…
Reference in new issue