diff options
Diffstat (limited to 'drivers/parport')
| -rw-r--r-- | drivers/parport/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/parport/Makefile | 3 | ||||
| -rw-r--r-- | drivers/parport/parport_ax88796.c | 443 |
3 files changed, 457 insertions, 1 deletions
diff --git a/drivers/parport/Kconfig b/drivers/parport/Kconfig index 4d8dc27ea9d1..c7fa28a28b9f 100644 --- a/drivers/parport/Kconfig +++ b/drivers/parport/Kconfig @@ -136,6 +136,18 @@ config PARPORT_SUNBPP found on many Sun machines. Note that many of the newer Ultras actually have pc style hardware instead. +config PARPORT_AX88796 + tristate "AX88796 Parallel Port" + depends on PARPORT + select PARPORT_NOT_PC + help + Say Y here if you need support for the parallel port hardware on + the AX88796 network controller chip. This code is also available + as a module (say M), called parport_ax88796. + + The driver is not dependant on the AX88796 network driver, and + should not interfere with the networking functions of the chip. + config PARPORT_1284 bool "IEEE 1284 transfer modes" depends on PARPORT diff --git a/drivers/parport/Makefile b/drivers/parport/Makefile index a19de35f8de2..696b8d4ca887 100644 --- a/drivers/parport/Makefile +++ b/drivers/parport/Makefile @@ -17,4 +17,5 @@ obj-$(CONFIG_PARPORT_MFC3) += parport_mfc3.o obj-$(CONFIG_PARPORT_ATARI) += parport_atari.o obj-$(CONFIG_PARPORT_SUNBPP) += parport_sunbpp.o obj-$(CONFIG_PARPORT_GSC) += parport_gsc.o -obj-$(CONFIG_PARPORT_IP32) += parport_ip32.o +obj-$(CONFIG_PARPORT_AX88796) += parport_ax88796.o +obj-$(CONFIG_PARPORT_IP32) += parport_ip32.o
\ No newline at end of file diff --git a/drivers/parport/parport_ax88796.c b/drivers/parport/parport_ax88796.c new file mode 100644 index 000000000000..4baa719439a2 --- /dev/null +++ b/drivers/parport/parport_ax88796.c @@ -0,0 +1,443 @@ +/* linux/drivers/parport/parport_ax88796.c + * + * (c) 2005,2006 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * +*/ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/parport.h> +#include <linux/interrupt.h> +#include <linux/errno.h> +#include <linux/platform_device.h> + +#include <asm/io.h> +#include <asm/irq.h> + +#define AX_SPR_BUSY (1<<7) +#define AX_SPR_ACK (1<<6) +#define AX_SPR_PE (1<<5) +#define AX_SPR_SLCT (1<<4) +#define AX_SPR_ERR (1<<3) + +#define AX_CPR_nDOE (1<<5) +#define AX_CPR_SLCTIN (1<<3) +#define AX_CPR_nINIT (1<<2) +#define AX_CPR_ATFD (1<<1) +#define AX_CPR_STRB (1<<0) + +struct ax_drvdata { + struct parport *parport; + struct parport_state suspend; + + struct device *dev; + struct resource *io; + + unsigned char irq_enabled; + + void __iomem *base; + void __iomem *spp_data; + void __iomem *spp_spr; + void __iomem *spp_cpr; +}; + +static inline struct ax_drvdata *pp_to_drv(struct parport *p) +{ + return p->private_data; +} + +static unsigned char +parport_ax88796_read_data(struct parport *p) +{ + struct ax_drvdata *dd = pp_to_drv(p); + + return readb(dd->spp_data); +} + +static void +parport_ax88796_write_data(struct parport *p, unsigned char data) +{ + struct ax_drvdata *dd = pp_to_drv(p); + + writeb(data, dd->spp_data); +} + +static unsigned char +parport_ax88796_read_control(struct parport *p) +{ + struct ax_drvdata *dd = pp_to_drv(p); + unsigned int cpr = readb(dd->spp_cpr); + unsigned int ret = 0; + + if (!(cpr & AX_CPR_STRB)) + ret |= PARPORT_CONTROL_STROBE; + + if (!(cpr & AX_CPR_ATFD)) + ret |= PARPORT_CONTROL_AUTOFD; + + if (cpr & AX_CPR_nINIT) + ret |= PARPORT_CONTROL_INIT; + + if (!(cpr & AX_CPR_SLCTIN)) + ret |= PARPORT_CONTROL_SELECT; + + return ret; +} + +static void +parport_ax88796_write_control(struct parport *p, unsigned char control) +{ + struct ax_drvdata *dd = pp_to_drv(p); + unsigned int cpr = readb(dd->spp_cpr); + + cpr &= AX_CPR_nDOE; + + if (!(control & PARPORT_CONTROL_STROBE)) + cpr |= AX_CPR_STRB; + + if (!(control & PARPORT_CONTROL_AUTOFD)) + cpr |= AX_CPR_ATFD; + + if (control & PARPORT_CONTROL_INIT) + cpr |= AX_CPR_nINIT; + + if (!(control & PARPORT_CONTROL_SELECT)) + cpr |= AX_CPR_SLCTIN; + + dev_dbg(dd->dev, "write_control: ctrl=%02x, cpr=%02x\n", control, cpr); + writeb(cpr, dd->spp_cpr); + + if (parport_ax88796_read_control(p) != control) { + dev_err(dd->dev, "write_control: read != set (%02x, %02x)\n", + parport_ax88796_read_control(p), control); + } +} + +static unsigned char +parport_ax88796_read_status(struct parport *p) +{ + struct ax_drvdata *dd = pp_to_drv(p); + unsigned int status = readb(dd->spp_spr); + unsigned int ret = 0; + + if (status & AX_SPR_BUSY) + ret |= PARPORT_STATUS_BUSY; + + if (status & AX_SPR_ACK) + ret |= PARPORT_STATUS_ACK; + + if (status & AX_SPR_ERR) + ret |= PARPORT_STATUS_ERROR; + + if (status & AX_SPR_SLCT) + ret |= PARPORT_STATUS_SELECT; + + if (status & AX_SPR_PE) + ret |= PARPORT_STATUS_PAPEROUT; + + return ret; +} + +static unsigned char +parport_ax88796_frob_control(struct parport *p, unsigned char mask, + unsigned char val) +{ + struct ax_drvdata *dd = pp_to_drv(p); + unsigned char old = parport_ax88796_read_control(p); + + dev_dbg(dd->dev, "frob: mask=%02x, val=%02x, old=%02x\n", + mask, val, old); + + parport_ax88796_write_control(p, (old & ~mask) | val); + return old; +} + +static void +parport_ax88796_enable_irq(struct parport *p) +{ + struct ax_drvdata *dd = pp_to_drv(p); + unsigned long flags; + + local_irq_save(flags); + if (!dd->irq_enabled) { + enable_irq(p->irq); + dd->irq_enabled = 1; + } + local_irq_restore(flags); +} + +static void +parport_ax88796_disable_irq(struct parport *p) +{ + struct ax_drvdata *dd = pp_to_drv(p); + unsigned long flags; + + local_irq_save(flags); + if (dd->irq_enabled) { + disable_irq(p->irq); + dd->irq_enabled = 0; + } + local_irq_restore(flags); +} + +static void +parport_ax88796_data_forward(struct parport *p) +{ + struct ax_drvdata *dd = pp_to_drv(p); + void __iomem *cpr = dd->spp_cpr; + + writeb((readb(cpr) & ~AX_CPR_nDOE), cpr); +} + +static void +parport_ax88796_data_reverse(struct parport *p) +{ + struct ax_drvdata *dd = pp_to_drv(p); + void __iomem *cpr = dd->spp_cpr; + + writeb(readb(cpr) | AX_CPR_nDOE, cpr); +} + +static void +parport_ax88796_init_state(struct pardevice *d, struct parport_state *s) +{ + struct ax_drvdata *dd = pp_to_drv(d->port); + + memset(s, 0, sizeof(struct parport_state)); + + dev_dbg(dd->dev, "init_state: %p: state=%p\n", d, s); + s->u.ax88796.cpr = readb(dd->spp_cpr); +} + +static void +parport_ax88796_save_state(struct parport *p, struct parport_state *s) +{ + struct ax_drvdata *dd = pp_to_drv(p); + + dev_dbg(dd->dev, "save_state: %p: state=%p\n", p, s); + s->u.ax88796.cpr = readb(dd->spp_cpr); +} + +static void +parport_ax88796_restore_state(struct parport *p, struct parport_state *s) +{ + struct ax_drvdata *dd = pp_to_drv(p); + + dev_dbg(dd->dev, "restore_state: %p: state=%p\n", p, s); + writeb(s->u.ax88796.cpr, dd->spp_cpr); +} + +static irqreturn_t +parport_ax88796_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + parport_generic_irq(irq, dev_id, regs); + return IRQ_HANDLED; +} + + +static struct parport_operations parport_ax88796_ops = { + .write_data = parport_ax88796_write_data, + .read_data = parport_ax88796_read_data, + + .write_control = parport_ax88796_write_control, + .read_control = parport_ax88796_read_control, + .frob_control = parport_ax88796_frob_control, + + .read_status = parport_ax88796_read_status, + + .enable_irq = parport_ax88796_enable_irq, + .disable_irq = parport_ax88796_disable_irq, + + .data_forward = parport_ax88796_data_forward, + .data_reverse = parport_ax88796_data_reverse, + + .init_state = parport_ax88796_init_state, + .save_state = parport_ax88796_save_state, + .restore_state = parport_ax88796_restore_state, + + .epp_write_data = parport_ieee1284_epp_write_data, + .epp_read_data = parport_ieee1284_epp_read_data, + .epp_write_addr = parport_ieee1284_epp_write_addr, + .epp_read_addr = parport_ieee1284_epp_read_addr, + + .ecp_write_data = parport_ieee1284_ecp_write_data, + .ecp_read_data = parport_ieee1284_ecp_read_data, + .ecp_write_addr = parport_ieee1284_ecp_write_addr, + + .compat_write_data = parport_ieee1284_write_compat, + .nibble_read_data = parport_ieee1284_read_nibble, + .byte_read_data = parport_ieee1284_read_byte, + + .owner = THIS_MODULE, +}; + +static int parport_ax88796_probe(struct platform_device *pdev) +{ + struct device *_dev = &pdev->dev; + struct ax_drvdata *dd; + struct parport *pp = NULL; + struct resource *res; + unsigned long size; + int spacing; + int irq; + int ret; + + dd = kzalloc(sizeof(struct ax_drvdata), GFP_KERNEL); + if (dd == NULL) { + dev_err(_dev, "no memory for private data\n"); + return -ENOMEM; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (res == NULL) { + dev_err(_dev, "no MEM specified\n"); + ret = -ENXIO; + goto exit_mem; + } + + size = (res->end - res->start) + 1; + spacing = size / 3; + + dd->io = request_mem_region(res->start, size, pdev->name); + if (dd->io == NULL) { + dev_err(_dev, "cannot reserve memory\n"); + ret = -ENXIO; + goto exit_mem; + } + + dd->base = ioremap(res->start, size); + if (dd->base == NULL) { + dev_err(_dev, "cannot ioremap region\n"); + ret = -ENXIO; + goto exit_res; + } + + irq = platform_get_irq(pdev, 0); + if (irq <= 0) + irq = PARPORT_IRQ_NONE; + + pp = parport_register_port((unsigned long)dd->base, irq, + PARPORT_DMA_NONE, + &parport_ax88796_ops); + + if (pp == NULL) { + dev_err(_dev, "failed to register parallel port\n"); + ret = -ENOMEM; + goto exit_unmap; + } + + pp->private_data = dd; + dd->parport = pp; + dd->dev = _dev; + + dd->spp_data = dd->base; + dd->spp_spr = dd->base + (spacing * 1); + dd->spp_cpr = dd->base + (spacing * 2); + + /* initialise the port controls */ + writeb(AX_CPR_STRB, dd->spp_cpr); + + if (irq >= 0) { + /* request irq */ + ret = request_irq(irq, parport_ax88796_interrupt, + SA_TRIGGER_FALLING, pdev->name, pp); + + if (ret < 0) + goto exit_port; + + dd->irq_enabled = 1; + } + + platform_set_drvdata(pdev, pp); + + dev_info(_dev, "attached parallel port driver\n"); + parport_announce_port(pp); + + return 0; + + exit_port: + parport_remove_port(pp); + exit_unmap: + iounmap(dd->base); + exit_res: + release_resource(dd->io); + kfree(dd->io); + exit_mem: + kfree(dd); + return ret; +} + +static int parport_ax88796_remove(struct platform_device *pdev) +{ + struct parport *p = platform_get_drvdata(pdev); + struct ax_drvdata *dd = pp_to_drv(p); + + free_irq(p->irq, p); + parport_remove_port(p); + iounmap(dd->base); + release_resource(dd->io); + kfree(dd->io); + kfree(dd); + + return 0; +} + +#ifdef CONFIG_PM + +static int parport_ax88796_suspend(struct platform_device *dev, + pm_message_t state) +{ + struct parport *p = platform_get_drvdata(dev); + struct ax_drvdata *dd = pp_to_drv(p); + + parport_ax88796_save_state(p, &dd->suspend); + writeb(AX_CPR_nDOE | AX_CPR_STRB, dd->spp_cpr); + return 0; +} + +static int parport_ax88796_resume(struct platform_device *dev) +{ + struct parport *p = platform_get_drvdata(dev); + struct ax_drvdata *dd = pp_to_drv(p); + + parport_ax88796_restore_state(p, &dd->suspend); + return 0; +} + +#else +#define parport_ax88796_suspend NULL +#define parport_ax88796_resume NULL +#endif + +static struct platform_driver axdrv = { + .driver = { + .name = "ax88796-pp", + .owner = THIS_MODULE, + }, + .probe = parport_ax88796_probe, + .remove = parport_ax88796_remove, + .suspend = parport_ax88796_suspend, + .resume = parport_ax88796_resume, +}; + +static int __init parport_ax88796_init(void) +{ + return platform_driver_register(&axdrv); +} + +static void __exit parport_ax88796_exit(void) +{ + platform_driver_unregister(&axdrv); +} + +module_init(parport_ax88796_init) +module_exit(parport_ax88796_exit) + +MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); +MODULE_DESCRIPTION("AX88796 Parport parallel port driver"); +MODULE_LICENSE("GPL"); |