mirror of
git://projects.qi-hardware.com/iris.git
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325 lines
9.2 KiB
Plaintext
325 lines
9.2 KiB
Plaintext
#pypp 0
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// Iris: micro-kernel for a capability-based operating system.
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// mips/nand.hhp: NAND driver functions, split off to be used in two places.
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// The functions are not inline, so this file must be included exactly once per executable that needs it.
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// Copyright 2009 Bas Wijnen <wijnen@debian.org>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// The following defines are taken from mtd/nand.h in the Linux source.
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// Everything not in the nand datasheet is thrown out.
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//#define dbgl() debug ("%s:%d\n", __PRETTY_FUNCTION__, __LINE__)
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#define dbgl()
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// Standard NAND flash commands
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#define CMD_READ0 0
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#define CMD_READSTART 0x30
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#define CMD_READID 0x90
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#define CMD_RESET 0xff
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#define CMD_SEQIN 0x80
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#define CMD_PAGEPROG 0x10
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#define CMD_ERASE1 0x60
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#define CMD_ERASE2 0xd0
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#define CMD_RNDIN 0x85
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#define CMD_RNDOUT 5
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#define CMD_RNDOUTSTART 0xe0
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#define CMD_STATUS 0x70
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// Status bits
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#define STATUS_FAIL 0x01
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#define STATUS_READY 0x40
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#define STATUS_WRITABLE 0x80
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static volatile char *command
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static volatile char *address
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static volatile char *data
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static unsigned page_bits
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static unsigned redundant_bits
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static unsigned block_bits
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static unsigned size_bits
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static unsigned word_size
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static unsigned ecc_start
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static void unbusy ():
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while !(gpio_get_port (2) & (1 << 30)):
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DELAY ()
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static void addr (unsigned d):
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unbusy ()
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*address = d
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static void cmd (unsigned d):
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unbusy ()
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*command = d
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static void wdata (unsigned d):
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unbusy ()
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*data = d
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static unsigned rdata ():
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unbusy ()
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unsigned ret = *data
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return ret
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static void reset ():
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// Set up.
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gpio_as_nand ()
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gpio_as_gpio (2, 1 << 30)
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gpio_as_input (2, 1 << 30)
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gpio_enable_pull (2, 1 << 30)
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EMC_NFCSR = EMC_NFCSR_NFE1 | EMC_NFCSR_NFCE1
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// Reset nand.
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cmd (CMD_RESET)
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cmd (CMD_READID)
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addr (0)
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unsigned d = rdata ()
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//unsigned maker = d
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d = rdata ()
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//unsigned device = d
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d = rdata ()
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//unsigned internal_chip_number = 1 << (d & 0x3)
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//unsigned cell_type = 2 << ((d >> 2) & 0x3)
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//unsigned simultaneously_programmed_pages = 1 << ((d >> 4) & 0x3)
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//bool can_interleave_program_between_chips = d & 0x40
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//bool can_cache_program = d & 0x80
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d = rdata ()
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page_bits = 10 + (d & 3)
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debug ("page bits: %d\n", page_bits)
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redundant_bits = (d & 4 ? 4 : 3)
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debug ("redundant bits: %d\n", redundant_bits)
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block_bits = 16 + ((d >> 4) & 3)
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debug ("block bits: %d\n", block_bits)
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word_size = (d & 0x40 ? 16 : 8)
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debug ("word size: %d\n", word_size)
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//unsigned serial_access_minimum = (d & 0x80 ? 25 : 50)
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d = rdata ()
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unsigned num_planes_bits = d >> 2 & 3
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unsigned plane_bits = 26 + (d >> 4 & 7)
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size_bits = plane_bits + num_planes_bits - 3
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if page_bits == 11:
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ecc_start = 6
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else if page_bits == 12:
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ecc_start = 12
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else:
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debug ("unknown nand type; assuming ecc offset to be 6. This is probably wrong!\n")
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ecc_start = 6
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static bool read (unsigned a, char *buffer):
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unsigned column = a & ((1 << page_bits) - 1)
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unsigned row = a >> page_bits
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//debug ("reading %x:", a)
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// Read oob information first.
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char error[12]
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// Spare space (starts at 1 << page_bits)
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// 0: unused
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// 2: detect valid data (at least 1 byte == 0 means valid)
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// 5: unused
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// 6: 9-byte ecc of 1st 512 bytes
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// 15: 9-byte ecc of 2nd 512 bytes
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// 24: 9-byte ecc of 3rd 512 bytes
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// 33: 9-byte ecc of 4th 512 bytes
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// 42: unused
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// 64: end of space
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// For 2 GB nand:
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// 0-11: unused/bad block markers
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// 12-89: 8 times 9-byte ecc
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// 90-127: unused
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// 128: end of space
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unsigned col = (1 << page_bits) + ecc_start + 9 * (column >> 9)
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cmd (CMD_READ0)
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addr (col)
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addr (col >> 8)
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addr (row)
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addr (row >> 8)
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addr (row >> 16)
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cmd (CMD_READSTART)
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//debug ("parity data:")
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bool parity_all_ff = true
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for unsigned t = 0; t < 9; ++t:
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error[t] = rdata ()
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if parity_all_ff && (error[t] & 0xff) != 0xff:
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parity_all_ff = false
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//debug (" %x", error[t] & 0xff)
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//debug ("\n")
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cmd (CMD_RNDOUT)
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addr (column)
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addr (column >> 8)
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cmd (CMD_RNDOUTSTART)
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EMC_NFINTS = 0
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EMC_NFECR = EMC_NFECR_ECCE | EMC_NFECR_RS | EMC_NFECR_RS_DECODING | EMC_NFECR_ERST
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bool all_ff = true
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for unsigned t = 0; t < 0x200; ++t:
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buffer[t] = rdata ()
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if all_ff && (buffer[t] & 0xff) != 0xff:
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all_ff = false
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if !all_ff || !parity_all_ff:
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for unsigned t = 0; t < 9; ++t:
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((volatile char *)&EMC_NFPAR (0))[t] = error[t]
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EMC_NFECR = EMC_NFECR_ECCE | EMC_NFECR_RS | EMC_NFECR_RS_DECODING | EMC_NFECR_PRDY
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while !(EMC_NFINTS & EMC_NFINTS_DECF):
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DELAY ()
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unsigned ints = EMC_NFINTS
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if ints & EMC_NFINTS_UNCOR:
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debug ("uncorrectable error in nand at %x\n", a)
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return false
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unsigned errs = (ints & EMC_NFINTS_ERRCNT_MASK) >> EMC_NFINTS_ERRCNT_BIT
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for unsigned i = 0; i < errs; ++i:
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unsigned err = EMC_NFERR (i)
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unsigned index = (err >> 16) - 1
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unsigned mask = err & 0x1ff
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unsigned bit = index * 9
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unsigned offset= bit & 7
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unsigned byte = bit / 8
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debug ("correcting %x on %x+%d\n", mask, byte, offset)
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unsigned data = buffer[byte] | buffer[byte + 1] << 8
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data ^= mask << offset
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buffer[byte] = data
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buffer[byte + 1] = data >> 8
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#if 0
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for unsigned i = 0; i < 0x10; ++i:
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if (buffer[i] & 0xff) < 0x10:
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debug (" 0")
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else:
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debug (" ")
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debug ("%x", buffer[i] & 0xff)
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debug ("\n")
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#endif
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return true
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static void write (unsigned a, char *buffer):
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unsigned row = a >> page_bits
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//debug ("writing: %x/%x\n", a, row)
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cmd (CMD_SEQIN)
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addr (0)
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addr (0)
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addr (row)
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addr (row >> 8)
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addr (row >> 16)
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char ecc[8][12]
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for unsigned i = 0; i < 1 << (page_bits - 9); ++i:
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bool all_ff = true
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EMC_NFECR = EMC_NFECR_ECCE | EMC_NFECR_RS | EMC_NFECR_RS_ENCODING | EMC_NFECR_ERST
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//debug ("writing data from %x\n", (unsigned)buffer + i * 0x200)
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for unsigned j = 0; j < 0x200; ++j:
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wdata (buffer[i * 0x200 + j])
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if all_ff && (buffer[i * 0x200 + j] & 0xff) != 0xff:
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all_ff = false
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if !all_ff:
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while !(EMC_NFINTS & EMC_NFINTS_ENCF):
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DELAY ()
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for unsigned t = 0; t < 9; ++t:
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ecc[i][t] = ((volatile char *)&EMC_NFPAR (0))[t]
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//debug ("parity for %x:", i * 0x200 + a)
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//for unsigned t = 0; t < 9; ++t:
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//debug (" %x", ecc[i][t] & 0xff)
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//kdebug ("\n")
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else:
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for unsigned t = 0; t < 9; ++t:
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ecc[i][t] = 0xff
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// Spare space (starts at 1 << page_bits)
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// 0: unused
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// 2: detect valid data (at least 1 byte == 0 means valid)
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// 5: unused
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// 6: 9-byte ecc of 1st 512 bytes
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// 15: 9-byte ecc of 2nd 512 bytes
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// 24: 9-byte ecc of 3rd 512 bytes
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// 33: 9-byte ecc of 4th 512 bytes
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// 42: unused
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// 64: end of space
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// For 2 GB nand:
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// 0-11: unused/bad block markers
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// 12-89: 8 times 9-byte ecc
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// 90-127: unused
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// 128: end of space
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for unsigned i = 0; i < ecc_start; ++i:
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wdata (i == 4 ? 0 : 0xff)
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for unsigned i = 0; i < 1 << (page_bits - 9); ++i:
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for unsigned j = 0; j < 9; ++j:
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wdata (ecc[i][j])
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cmd (CMD_PAGEPROG)
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// Wait at least 100 ns.
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DELAY ()
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cmd (CMD_READ0)
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addr (0)
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addr (0)
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addr (row)
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addr (row >> 8)
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addr (row >> 16)
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cmd (CMD_READSTART)
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for unsigned i = 0; i < 1 << (page_bits - 9); ++i:
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EMC_NFINTS = 0
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EMC_NFECR = EMC_NFECR_ECCE | EMC_NFECR_RS | EMC_NFECR_RS_DECODING | EMC_NFECR_ERST
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for unsigned t = 0; t < 0x200; ++t:
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unsigned r = rdata () & 0xff
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if r != (buffer[i * 0x200 + t] & 0xff):
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debug ("program error at %x: %x != %x\n", i * 0x200 + t, buffer[i * 0x200 + t] & 0xff, r)
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for unsigned t = 0; t < 9; ++t:
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((volatile char *)&EMC_NFPAR (0))[t] = ecc[i][t]
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EMC_NFECR = EMC_NFECR_ECCE | EMC_NFECR_RS | EMC_NFECR_RS_DECODING | EMC_NFECR_PRDY
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while !(EMC_NFINTS & EMC_NFINTS_DECF):
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DELAY ()
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unsigned ints = EMC_NFINTS
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if ints & EMC_NFINTS_UNCOR:
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debug ("uncorrectable error during verify\n")
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continue
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unsigned errs = (ints & EMC_NFINTS_ERRCNT_MASK) >> EMC_NFINTS_ERRCNT_BIT
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for unsigned i = 0; i < errs; ++i:
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unsigned err = EMC_NFERR (i)
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unsigned index = (err >> 16) - 1
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unsigned mask = err & 0x1ff
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unsigned bit = index * 9
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unsigned offset= bit & 7
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unsigned byte = bit / 8
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debug ("error detected by parity: %x on %x+%d\n", mask, byte, offset)
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for unsigned i = 0; i < ecc_start; ++i:
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if rdata () != (i == 4 ? 0 : 0xff):
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debug ("incorrect extra data at byte %d\n", i)
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for unsigned i = 0; i < 1 << (page_bits - 9); ++i:
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for unsigned j = 0; j < 9; ++j:
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unsigned r = rdata () & 0xff
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if r != (ecc[i][j] & 0xff):
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debug ("ecc doesn't match: %x != %x\n", r, ecc[i][j] & 0xff)
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//debug ("nand program %x:", a)
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#if 0
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for unsigned i = 0; i < 0x10; ++i:
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if (buffer[i] & 0xff) < 0x10:
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debug (" 0")
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else:
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debug (" ")
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debug ("%x", buffer[i] & 0xff)
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debug ("\n")
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#endif
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static void erase (unsigned a):
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unsigned row = a >> page_bits
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cmd (CMD_ERASE1)
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addr (row)
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addr (row >> 8)
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addr (row >> 16)
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cmd (CMD_ERASE2)
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//debug ("nand erase %d done\n", a)
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