diff options
| -rw-r--r-- | flashrom.8 | 14 | ||||
| -rw-r--r-- | rayer_spi.c | 90 |
2 files changed, 69 insertions, 35 deletions
@@ -397,7 +397,19 @@ can be any of (in Hz). The default is the maximum frequency of 8 MHz. .TP .BR "rayer_spi " programmer -No parameters defined yet. More information about the hardware is available at +The default I/O base address used for the parallel port is 0x378 and you can use +the optional +.B iobase +parameter to specify an alternate base I/O address with the +.sp +.B " flashrom \-p rayer_spi:iobase=baseaddr" +.sp +syntax where +.B baseaddr +is base I/O port address of the parallel port, which must be a multiple of +four. Make sure to not forget the "0x" prefix for hexadecimal port addresses. +.sp +More information about the hardware is available at http://rayer.ic.cz/elektro/spipgm.htm .SH EXIT STATUS flashrom exits with 0 on success, 1 on most failures but with 2 if /dev/mem diff --git a/rayer_spi.c b/rayer_spi.c index 722ad14..a01ee80 100644 --- a/rayer_spi.c +++ b/rayer_spi.c @@ -30,6 +30,7 @@ */ #if defined(__i386__) || defined(__x86_64__) +#include <stdlib.h> #include "flash.h" #include "programmer.h" @@ -43,45 +44,33 @@ /* Pins for slave->master direction */ #define SPI_MISO_PIN 6 -static int lpt_iobase; +static uint16_t lpt_iobase; -/* FIXME: All rayer_bitbang_set_* functions could use caching of the value - * stored at port lpt_iobase to avoid unnecessary INB. In theory, only one - * INB(lpt_iobase) would be needed on programmer init to get the initial - * value. - */ +/* Cached value of last byte sent. */ +static uint8_t lpt_outbyte; -void rayer_bitbang_set_cs(int val) +static void rayer_bitbang_set_cs(int val) { - uint8_t tmp; - - tmp = INB(lpt_iobase); - tmp &= ~(1 << SPI_CS_PIN); - tmp |= (val << SPI_CS_PIN); - OUTB(tmp, lpt_iobase); + lpt_outbyte &= ~(1 << SPI_CS_PIN); + lpt_outbyte |= (val << SPI_CS_PIN); + OUTB(lpt_outbyte, lpt_iobase); } -void rayer_bitbang_set_sck(int val) +static void rayer_bitbang_set_sck(int val) { - uint8_t tmp; - - tmp = INB(lpt_iobase); - tmp &= ~(1 << SPI_SCK_PIN); - tmp |= (val << SPI_SCK_PIN); - OUTB(tmp, lpt_iobase); + lpt_outbyte &= ~(1 << SPI_SCK_PIN); + lpt_outbyte |= (val << SPI_SCK_PIN); + OUTB(lpt_outbyte, lpt_iobase); } -void rayer_bitbang_set_mosi(int val) +static void rayer_bitbang_set_mosi(int val) { - uint8_t tmp; - - tmp = INB(lpt_iobase); - tmp &= ~(1 << SPI_MOSI_PIN); - tmp |= (val << SPI_MOSI_PIN); - OUTB(tmp, lpt_iobase); + lpt_outbyte &= ~(1 << SPI_MOSI_PIN); + lpt_outbyte |= (val << SPI_MOSI_PIN); + OUTB(lpt_outbyte, lpt_iobase); } -int rayer_bitbang_get_miso(void) +static int rayer_bitbang_get_miso(void) { uint8_t tmp; @@ -100,16 +89,49 @@ static const struct bitbang_spi_master bitbang_spi_master_rayer = { int rayer_spi_init(void) { - /* Pick a default value for now. */ - lpt_iobase = 0x378; - - msg_pdbg("Using port 0x%x as I/O base for parallel port access.\n", + char *portpos = NULL; + + /* Non-default port requested? */ + portpos = extract_programmer_param("iobase"); + if (portpos) { + char *endptr = NULL; + unsigned long tmp; + tmp = strtoul(portpos, &endptr, 0); + /* Port 0, port >0x10000, unaligned ports and garbage strings + * are rejected. + */ + if (!tmp || (tmp >= 0x10000) || (tmp & 0x3) || + (*endptr != '\0')) { + /* Using ports below 0x100 is a really bad idea, and + * should only be done if no port between 0x100 and + * 0xfffc works due to routing issues. + */ + msg_perr("Error: iobase= specified, but the I/O base " + "given was invalid.\nIt must be a multiple of " + "0x4 and lie between 0x100 and 0xfffc.\n"); + free(portpos); + return 1; + } else { + lpt_iobase = (uint16_t)tmp; + msg_pinfo("Non-default I/O base requested. This will " + "not change the hardware settings.\n"); + } + } else { + /* Pick a default value for the I/O base. */ + lpt_iobase = 0x378; + } + free(portpos); + + msg_pdbg("Using address 0x%x as I/O base for parallel port access.\n", lpt_iobase); get_io_perms(); - /* 1 usec halfperiod delay for now. */ - if (bitbang_spi_init(&bitbang_spi_master_rayer, 1)) + /* Get the initial value before writing to any line. */ + lpt_outbyte = INB(lpt_iobase); + + /* Zero halfperiod delay. */ + if (bitbang_spi_init(&bitbang_spi_master_rayer, 0)) return 1; buses_supported = CHIP_BUSTYPE_SPI; |
