Add FreeCom power protocol driver. Signed-off-by: Ondrej Zary <linux@xxxxxxx> --- drivers/ata/pata_parport/Kconfig | 10 + drivers/ata/pata_parport/Makefile | 1 + drivers/ata/pata_parport/frpw.c | 292 ++++++++++++++++++++++++++++++ 3 files changed, 303 insertions(+) create mode 100644 drivers/ata/pata_parport/frpw.c diff --git a/drivers/ata/pata_parport/Kconfig b/drivers/ata/pata_parport/Kconfig index 8a569ee0bf6a..d8e5feaaae7a 100644 --- a/drivers/ata/pata_parport/Kconfig +++ b/drivers/ata/pata_parport/Kconfig @@ -132,3 +132,13 @@ config PATA_PARPORT_FRIQ should answer M to build it as a loadable module. The module will be called friq. You must also have a high-level driver for the type of device that you want to support. + +config PATA_PARPORT_FRPW + tristate "FreeCom power protocol" + depends on PATA_PARPORT + help + This option enables support for the Freecom power parallel port IDE + protocol. If you chose to build PATA_PARPORT support into your kernel, you + may answer Y here to build in the protocol driver, otherwise you + should answer M to build it as a loadable module. The module will be + called frpw. diff --git a/drivers/ata/pata_parport/Makefile b/drivers/ata/pata_parport/Makefile index 20d05e525c95..136374be9613 100644 --- a/drivers/ata/pata_parport/Makefile +++ b/drivers/ata/pata_parport/Makefile @@ -17,3 +17,4 @@ obj-$(CONFIG_PATA_PARPORT_FIT3) += fit3.o obj-$(CONFIG_PATA_PARPORT_EPAT) += epat.o obj-$(CONFIG_PATA_PARPORT_EPIA) += epia.o obj-$(CONFIG_PATA_PARPORT_FRIQ) += friq.o +obj-$(CONFIG_PATA_PARPORT_FRPW) += frpw.o diff --git a/drivers/ata/pata_parport/frpw.c b/drivers/ata/pata_parport/frpw.c new file mode 100644 index 000000000000..5151d3c26361 --- /dev/null +++ b/drivers/ata/pata_parport/frpw.c @@ -0,0 +1,292 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * frpw.c (c) 1996-8 Grant R. Guenther <grant@xxxxxxxxxx> + * Under the terms of the GNU General Public License + * + * frpw.c is a low-level protocol driver for the Freecom "Power" + * parallel port IDE adapter. + * + * Some applications of this adapter may require a "printer" reset + * prior to loading the driver. This can be done by loading and + * unloading the "lp" driver, or it can be done by this driver + * if you define FRPW_HARD_RESET. The latter is not recommended + * as it may upset devices on other ports. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/wait.h> +#include <linux/io.h> + +#include "pata_parport.h" + +#define cec4 do { w2(0xc); w2(0xe); w2(0xe); w2(0xc); w2(4); w2(4); w2(4); } while (0) +#define j44(l, h) (((l >> 4) & 0x0f) | (h & 0xf0)) + +/* cont = 0 - access the IDE register file + * cont = 1 - access the IDE command set + */ + +static int cont_map[2] = { 0x08, 0x10 }; + +static int frpw_read_regr(struct pi_adapter *pi, int cont, int regr) +{ + int h, l, r; + + r = regr + cont_map[cont]; + + w2(4); + w0(r); cec4; + w2(6); l = r1(); + w2(4); h = r1(); + w2(4); + + return j44(l, h); +} + +static void frpw_write_regr(struct pi_adapter *pi, int cont, int regr, int val) +{ + int r = regr + cont_map[cont]; + + w2(4); w0(r); cec4; + w0(val); + w2(5); w2(7); w2(5); w2(4); +} + +static void frpw_read_block_int(struct pi_adapter *pi, char *buf, int count, int regr) +{ + int h, l, k, ph; + + switch (pi->mode) { + case 0: + w2(4); w0(regr); cec4; + for (k = 0; k < count; k++) { + w2(6); l = r1(); + w2(4); h = r1(); + buf[k] = j44(l, h); + } + w2(4); + break; + case 1: + ph = 2; + w2(4); w0(regr + 0xc0); cec4; + w0(0xff); + for (k = 0; k < count; k++) { + w2(0xa4 + ph); + buf[k] = r0(); + ph = 2 - ph; + } + w2(0xac); w2(0xa4); w2(4); + break; + case 2: + w2(4); w0(regr + 0x80); cec4; + for (k = 0; k < count; k++) + buf[k] = r4(); + w2(0xac); w2(0xa4); + w2(4); + break; + case 3: + w2(4); w0(regr + 0x80); cec4; + for (k = 0; k < count - 2; k++) + buf[k] = r4(); + w2(0xac); w2(0xa4); + buf[count - 2] = r4(); + buf[count - 1] = r4(); + w2(4); + break; + case 4: + w2(4); w0(regr + 0x80); cec4; + for (k = 0; k < (count / 2) - 1; k++) + ((u16 *)buf)[k] = r4w(); + w2(0xac); w2(0xa4); + buf[count - 2] = r4(); + buf[count - 1] = r4(); + w2(4); + break; + case 5: + w2(4); w0(regr + 0x80); cec4; + for (k = 0; k < (count / 4) - 1; k++) + ((u32 *)buf)[k] = r4l(); + buf[count - 4] = r4(); + buf[count - 3] = r4(); + w2(0xac); w2(0xa4); + buf[count - 2] = r4(); + buf[count - 1] = r4(); + w2(4); + break; + } +} + +static void frpw_read_block(struct pi_adapter *pi, char *buf, int count) +{ + frpw_read_block_int(pi, buf, count, 0x08); +} + +static void frpw_write_block(struct pi_adapter *pi, char *buf, int count) +{ + int k; + + switch (pi->mode) { + case 0: + case 1: + case 2: + w2(4); w0(8); cec4; w2(5); + for (k = 0; k < count; k++) { + w0(buf[k]); + w2(7); w2(5); + } + w2(4); + break; + case 3: + w2(4); w0(0xc8); cec4; w2(5); + for (k = 0; k < count; k++) + w4(buf[k]); + w2(4); + break; + case 4: + w2(4); w0(0xc8); cec4; w2(5); + for (k = 0; k < count / 2; k++) + w4w(((u16 *)buf)[k]); + w2(4); + break; + case 5: + w2(4); w0(0xc8); cec4; w2(5); + for (k = 0; k < count / 4; k++) + w4l(((u32 *)buf)[k]); + w2(4); + break; + } +} + +static void frpw_connect(struct pi_adapter *pi) +{ + pi->saved_r0 = r0(); + pi->saved_r2 = r2(); + w2(4); +} + +static void frpw_disconnect(struct pi_adapter *pi) +{ + w2(4); w0(0x20); cec4; + w0(pi->saved_r0); + w2(pi->saved_r2); +} + +/* Stub logic to see if PNP string is available - used to distinguish + * between the Xilinx and ASIC implementations of the Freecom adapter. + * + * returns chip_type: 0 = Xilinx, 1 = ASIC + */ + +static int frpw_test_pnp(struct pi_adapter *pi) +{ + int olddelay, a, b; + +#ifdef FRPW_HARD_RESET + w0(0); w2(8); udelay(50); w2(0xc); /* parallel bus reset */ + mdelay(1500); +#endif + + olddelay = pi->delay; + pi->delay = 10; + + pi->saved_r0 = r0(); + pi->saved_r2 = r2(); + + w2(4); w0(4); w2(6); w2(7); + a = r1() & 0xff; w2(4); b = r1() & 0xff; + w2(0xc); w2(0xe); w2(4); + + pi->delay = olddelay; + w0(pi->saved_r0); + w2(pi->saved_r2); + + return ((~a & 0x40) && (b & 0x40)); +} + +/* We use the pi->private to remember the result of the PNP test. + * To make this work, private = port*2 + chip. Yes, I know it's a hack :-( + */ + +static int frpw_test_proto(struct pi_adapter *pi, char *scratch, int verbose) +{ + int j, k, r; + int e[2] = { 0, 0 }; + + if ((pi->private>>1) != pi->port) + pi->private = frpw_test_pnp(pi) + 2 * pi->port; + + if (((pi->private % 2) == 0) && (pi->mode > 2)) { + if (verbose) + dev_info(&pi->dev, "frpw: Xilinx does not support mode %d\n", + pi->mode); + return 1; + } + + if (((pi->private % 2) == 1) && (pi->mode == 2)) { + if (verbose) + dev_info(&pi->dev, "frpw: ASIC does not support mode 2\n"); + return 1; + } + + frpw_connect(pi); + for (j = 0; j < 2; j++) { + frpw_write_regr(pi, 0, 6, 0xa0 + j * 0x10); + for (k = 0; k < 256; k++) { + frpw_write_regr(pi, 0, 2, k ^ 0xaa); + frpw_write_regr(pi, 0, 3, k ^ 0x55); + if (frpw_read_regr(pi, 0, 2) != (k ^ 0xaa)) + e[j]++; + } + } + frpw_disconnect(pi); + + frpw_connect(pi); + frpw_read_block_int(pi, scratch, 512, 0x10); + r = 0; + for (k = 0; k < 128; k++) + if (scratch[k] != k) + r++; + frpw_disconnect(pi); + + if (verbose) + dev_info(&pi->dev, "frpw: port 0x%x, chip %ld, mode %d, test=(%d,%d,%d)\n", + pi->port, (pi->private % 2), pi->mode, e[0], e[1], r); + + return (r || (e[0] && e[1])); +} + + +static void frpw_log_adapter(struct pi_adapter *pi, char *scratch, int verbose) +{ + static char * const mode_string[] = { + "4-bit", "8-bit", "EPP", "EPP-8", "EPP-16", "EPP-32" }; + + dev_info(&pi->dev, "frpw, Freecom (%s) adapter at 0x%x, mode %d (%s), delay %d\n", + ((pi->private % 2) == 0) ? "Xilinx" : "ASIC", pi->port, + pi->mode, mode_string[pi->mode], pi->delay); +} + +static struct pi_protocol frpw = { + .owner = THIS_MODULE, + .name = "frpw", + .max_mode = 6, + .epp_first = 2, + .default_delay = 2, + .max_units = 1, + .write_regr = frpw_write_regr, + .read_regr = frpw_read_regr, + .write_block = frpw_write_block, + .read_block = frpw_read_block, + .connect = frpw_connect, + .disconnect = frpw_disconnect, + .test_proto = frpw_test_proto, + .log_adapter = frpw_log_adapter, + .sht = { PATA_PARPORT_SHT("pata_parport-frpw") }, +}; + +MODULE_LICENSE("GPL"); +module_pata_parport_driver(frpw); -- Ondrej Zary