--- /dev/null
+/* 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");
projects / GitHub / LineageOS / G12 / android_kernel_amlogic_linux-4.9.git / commitdiff