^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * parport-to-butterfly adapter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2005 David Brownell
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/parport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/spi/spi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/spi/spi_bitbang.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/spi/flash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/mtd/partitions.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * This uses SPI to talk with an "AVR Butterfly", which is a $US20 card
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * with a battery powered AVR microcontroller and lots of goodies. You
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * can use GCC to develop firmware for this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * See Documentation/spi/butterfly.rst for information about how to build
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * and use this custom parallel port cable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /* DATA output bits (pins 2..9 == D0..D7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define butterfly_nreset (1 << 1) /* pin 3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define spi_sck_bit (1 << 0) /* pin 2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define spi_mosi_bit (1 << 7) /* pin 9 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define vcc_bits ((1 << 6) | (1 << 5)) /* pins 7, 8 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /* STATUS input bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define spi_miso_bit PARPORT_STATUS_BUSY /* pin 11 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /* CONTROL output bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define spi_cs_bit PARPORT_CONTROL_SELECT /* pin 17 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static inline struct butterfly *spidev_to_pp(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return spi->controller_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct butterfly {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /* REVISIT ... for now, this must be first */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct spi_bitbang bitbang;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct parport *port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct pardevice *pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) u8 lastbyte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct spi_device *dataflash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct spi_device *butterfly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct spi_board_info info[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) /*----------------------------------------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) setsck(struct spi_device *spi, int is_on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct butterfly *pp = spidev_to_pp(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) u8 bit, byte = pp->lastbyte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) bit = spi_sck_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (is_on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) byte |= bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) byte &= ~bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) parport_write_data(pp->port, byte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) pp->lastbyte = byte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) setmosi(struct spi_device *spi, int is_on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct butterfly *pp = spidev_to_pp(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) u8 bit, byte = pp->lastbyte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) bit = spi_mosi_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (is_on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) byte |= bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) byte &= ~bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) parport_write_data(pp->port, byte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) pp->lastbyte = byte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static inline int getmiso(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct butterfly *pp = spidev_to_pp(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) int value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) u8 bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) bit = spi_miso_bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /* only STATUS_BUSY is NOT negated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) value = !(parport_read_status(pp->port) & bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return (bit == PARPORT_STATUS_BUSY) ? value : !value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static void butterfly_chipselect(struct spi_device *spi, int value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct butterfly *pp = spidev_to_pp(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* set default clock polarity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (value != BITBANG_CS_INACTIVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) setsck(spi, spi->mode & SPI_CPOL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /* here, value == "activate or not";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * most PARPORT_CONTROL_* bits are negated, so we must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * morph it to value == "bit value to write in control register"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (spi_cs_bit == PARPORT_CONTROL_INIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) value = !value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) parport_frob_control(pp->port, spi_cs_bit, value ? spi_cs_bit : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /* we only needed to implement one mode here, and choose SPI_MODE_0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) #define spidelay(X) do { } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) /* #define spidelay ndelay */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) #include "spi-bitbang-txrx.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static u32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) butterfly_txrx_word_mode0(struct spi_device *spi, unsigned nsecs, u32 word,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) u8 bits, unsigned flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) /*----------------------------------------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) /* override default partitioning with cmdlinepart */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static struct mtd_partition partitions[] = { {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) /* JFFS2 wants partitions of 4*N blocks for this device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * so sectors 0 and 1 can't be partitions by themselves.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /* sector 0 = 8 pages * 264 bytes/page (1 block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * sector 1 = 248 pages * 264 bytes/page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) .name = "bookkeeping", /* 66 KB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) .offset = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) .size = (8 + 248) * 264,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /* .mask_flags = MTD_WRITEABLE, */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* sector 2 = 256 pages * 264 bytes/page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * sectors 3-5 = 512 pages * 264 bytes/page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .name = "filesystem", /* 462 KB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) .offset = MTDPART_OFS_APPEND,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) .size = MTDPART_SIZ_FULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) } };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static struct flash_platform_data flash = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) .name = "butterflash",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) .parts = partitions,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) .nr_parts = ARRAY_SIZE(partitions),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /* REVISIT remove this ugly global and its "only one" limitation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static struct butterfly *butterfly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static void butterfly_attach(struct parport *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) struct pardevice *pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct butterfly *pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct spi_master *master;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) struct device *dev = p->physport->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct pardev_cb butterfly_cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (butterfly || !dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /* REVISIT: this just _assumes_ a butterfly is there ... no probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * and no way to be selective about what it binds to.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) master = spi_alloc_master(dev, sizeof(*pp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (!master) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) status = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) pp = spi_master_get_devdata(master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) * SPI and bitbang hookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * use default setup(), cleanup(), and transfer() methods; and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * only bother implementing mode 0. Start it later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) master->bus_num = 42;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) master->num_chipselect = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) pp->bitbang.master = master;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) pp->bitbang.chipselect = butterfly_chipselect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) pp->bitbang.txrx_word[SPI_MODE_0] = butterfly_txrx_word_mode0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * parport hookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) pp->port = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) memset(&butterfly_cb, 0, sizeof(butterfly_cb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) butterfly_cb.private = pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) pd = parport_register_dev_model(p, "spi_butterfly", &butterfly_cb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (!pd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) status = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) goto clean0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) pp->pd = pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) status = parport_claim(pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if (status < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) goto clean1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * Butterfly reset, powerup, run firmware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) pr_debug("%s: powerup/reset Butterfly\n", p->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) /* nCS for dataflash (this bit is inverted on output) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) parport_frob_control(pp->port, spi_cs_bit, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /* stabilize power with chip in reset (nRESET), and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * spi_sck_bit clear (CPOL=0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) pp->lastbyte |= vcc_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) parport_write_data(pp->port, pp->lastbyte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) msleep(5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* take it out of reset; assume long reset delay */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) pp->lastbyte |= butterfly_nreset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) parport_write_data(pp->port, pp->lastbyte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) msleep(100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * Start SPI ... for now, hide that we're two physical busses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) status = spi_bitbang_start(&pp->bitbang);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (status < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) goto clean2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) /* Bus 1 lets us talk to at45db041b (firmware disables AVR SPI), AVR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * (firmware resets at45, acts as spi slave) or neither (we ignore
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * both, AVR uses AT45). Here we expect firmware for the first option.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) pp->info[0].max_speed_hz = 15 * 1000 * 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) strcpy(pp->info[0].modalias, "mtd_dataflash");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) pp->info[0].platform_data = &flash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) pp->info[0].chip_select = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) pp->info[0].controller_data = pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) pp->dataflash = spi_new_device(pp->bitbang.master, &pp->info[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (pp->dataflash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) pr_debug("%s: dataflash at %s\n", p->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) dev_name(&pp->dataflash->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) pr_info("%s: AVR Butterfly\n", p->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) butterfly = pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) clean2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) /* turn off VCC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) parport_write_data(pp->port, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) parport_release(pp->pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) clean1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) parport_unregister_device(pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) clean0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) spi_master_put(pp->bitbang.master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) pr_debug("%s: butterfly probe, fail %d\n", p->name, status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) static void butterfly_detach(struct parport *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) struct butterfly *pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) /* FIXME this global is ugly ... but, how to quickly get from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) * the parport to the "struct butterfly" associated with it?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * "old school" driver-internal device lists?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) if (!butterfly || butterfly->port != p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) pp = butterfly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) butterfly = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) /* stop() unregisters child devices too */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) spi_bitbang_stop(&pp->bitbang);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /* turn off VCC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) parport_write_data(pp->port, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) msleep(10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) parport_release(pp->pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) parport_unregister_device(pp->pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) spi_master_put(pp->bitbang.master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static struct parport_driver butterfly_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) .name = "spi_butterfly",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) .match_port = butterfly_attach,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) .detach = butterfly_detach,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) .devmodel = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) static int __init butterfly_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) return parport_register_driver(&butterfly_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) device_initcall(butterfly_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) static void __exit butterfly_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) parport_unregister_driver(&butterfly_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) module_exit(butterfly_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) MODULE_DESCRIPTION("Parport Adapter driver for AVR Butterfly");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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