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![Christophe JAILLET](/assets/img/avatar_default.png)
'status' is known to be 0 at this point. It must be set to a meaningful value in order to return an error code if one of the 'of_get_property()' call fails. Return -EINVAL in such a case. Fixes: 2b571a066a2f("pcmcia: CompactFlash driver for PA Semi Electra boards") Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
354 lines
7.7 KiB
C
354 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2007 PA Semi, Inc
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*
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* Maintained by: Olof Johansson <olof@lixom.net>
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*
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* Based on drivers/pcmcia/omap_cf.c
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/platform_device.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/slab.h>
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#include <pcmcia/ss.h>
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static const char driver_name[] = "electra-cf";
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struct electra_cf_socket {
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struct pcmcia_socket socket;
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struct timer_list timer;
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unsigned present:1;
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unsigned active:1;
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struct platform_device *ofdev;
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unsigned long mem_phys;
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void __iomem *mem_base;
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unsigned long mem_size;
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void __iomem *io_virt;
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unsigned int io_base;
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unsigned int io_size;
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u_int irq;
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struct resource iomem;
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void __iomem *gpio_base;
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int gpio_detect;
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int gpio_vsense;
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int gpio_3v;
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int gpio_5v;
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};
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#define POLL_INTERVAL (2 * HZ)
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static int electra_cf_present(struct electra_cf_socket *cf)
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{
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unsigned int gpio;
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gpio = in_le32(cf->gpio_base+0x40);
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return !(gpio & (1 << cf->gpio_detect));
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}
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static int electra_cf_ss_init(struct pcmcia_socket *s)
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{
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return 0;
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}
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/* the timer is primarily to kick this socket's pccardd */
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static void electra_cf_timer(struct timer_list *t)
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{
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struct electra_cf_socket *cf = from_timer(cf, t, timer);
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int present = electra_cf_present(cf);
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if (present != cf->present) {
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cf->present = present;
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pcmcia_parse_events(&cf->socket, SS_DETECT);
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}
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if (cf->active)
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mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
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}
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static irqreturn_t electra_cf_irq(int irq, void *_cf)
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{
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struct electra_cf_socket *cf = _cf;
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electra_cf_timer(&cf->timer);
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return IRQ_HANDLED;
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}
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static int electra_cf_get_status(struct pcmcia_socket *s, u_int *sp)
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{
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struct electra_cf_socket *cf;
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if (!sp)
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return -EINVAL;
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cf = container_of(s, struct electra_cf_socket, socket);
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/* NOTE CF is always 3VCARD */
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if (electra_cf_present(cf)) {
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*sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
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s->pci_irq = cf->irq;
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} else
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*sp = 0;
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return 0;
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}
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static int electra_cf_set_socket(struct pcmcia_socket *sock,
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struct socket_state_t *s)
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{
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unsigned int gpio;
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unsigned int vcc;
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struct electra_cf_socket *cf;
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cf = container_of(sock, struct electra_cf_socket, socket);
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/* "reset" means no power in our case */
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vcc = (s->flags & SS_RESET) ? 0 : s->Vcc;
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switch (vcc) {
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case 0:
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gpio = 0;
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break;
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case 33:
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gpio = (1 << cf->gpio_3v);
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break;
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case 5:
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gpio = (1 << cf->gpio_5v);
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break;
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default:
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return -EINVAL;
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}
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gpio |= 1 << (cf->gpio_3v + 16); /* enwr */
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gpio |= 1 << (cf->gpio_5v + 16); /* enwr */
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out_le32(cf->gpio_base+0x90, gpio);
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pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
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driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
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return 0;
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}
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static int electra_cf_set_io_map(struct pcmcia_socket *s,
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struct pccard_io_map *io)
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{
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return 0;
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}
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static int electra_cf_set_mem_map(struct pcmcia_socket *s,
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struct pccard_mem_map *map)
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{
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struct electra_cf_socket *cf;
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if (map->card_start)
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return -EINVAL;
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cf = container_of(s, struct electra_cf_socket, socket);
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map->static_start = cf->mem_phys;
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map->flags &= MAP_ACTIVE|MAP_ATTRIB;
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if (!(map->flags & MAP_ATTRIB))
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map->static_start += 0x800;
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return 0;
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}
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static struct pccard_operations electra_cf_ops = {
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.init = electra_cf_ss_init,
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.get_status = electra_cf_get_status,
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.set_socket = electra_cf_set_socket,
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.set_io_map = electra_cf_set_io_map,
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.set_mem_map = electra_cf_set_mem_map,
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};
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static int electra_cf_probe(struct platform_device *ofdev)
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{
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struct device *device = &ofdev->dev;
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struct device_node *np = ofdev->dev.of_node;
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struct electra_cf_socket *cf;
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struct resource mem, io;
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int status = -ENOMEM;
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const unsigned int *prop;
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int err;
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err = of_address_to_resource(np, 0, &mem);
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if (err)
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return -EINVAL;
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err = of_address_to_resource(np, 1, &io);
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if (err)
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return -EINVAL;
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cf = kzalloc(sizeof(*cf), GFP_KERNEL);
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if (!cf)
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return -ENOMEM;
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timer_setup(&cf->timer, electra_cf_timer, 0);
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cf->irq = 0;
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cf->ofdev = ofdev;
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cf->mem_phys = mem.start;
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cf->mem_size = PAGE_ALIGN(resource_size(&mem));
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cf->mem_base = ioremap(cf->mem_phys, cf->mem_size);
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if (!cf->mem_base)
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goto out_free_cf;
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cf->io_size = PAGE_ALIGN(resource_size(&io));
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cf->io_virt = ioremap_phb(io.start, cf->io_size);
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if (!cf->io_virt)
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goto out_unmap_mem;
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cf->gpio_base = ioremap(0xfc103000, 0x1000);
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if (!cf->gpio_base)
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goto out_unmap_virt;
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dev_set_drvdata(device, cf);
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cf->io_base = (unsigned long)cf->io_virt - VMALLOC_END;
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cf->iomem.start = (unsigned long)cf->mem_base;
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cf->iomem.end = (unsigned long)cf->mem_base + (mem.end - mem.start);
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cf->iomem.flags = IORESOURCE_MEM;
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cf->irq = irq_of_parse_and_map(np, 0);
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status = request_irq(cf->irq, electra_cf_irq, IRQF_SHARED,
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driver_name, cf);
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if (status < 0) {
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dev_err(device, "request_irq failed\n");
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goto fail1;
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}
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cf->socket.pci_irq = cf->irq;
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status = -EINVAL;
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prop = of_get_property(np, "card-detect-gpio", NULL);
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if (!prop)
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goto fail1;
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cf->gpio_detect = *prop;
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prop = of_get_property(np, "card-vsense-gpio", NULL);
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if (!prop)
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goto fail1;
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cf->gpio_vsense = *prop;
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prop = of_get_property(np, "card-3v-gpio", NULL);
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if (!prop)
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goto fail1;
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cf->gpio_3v = *prop;
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prop = of_get_property(np, "card-5v-gpio", NULL);
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if (!prop)
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goto fail1;
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cf->gpio_5v = *prop;
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cf->socket.io_offset = cf->io_base;
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/* reserve chip-select regions */
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if (!request_mem_region(cf->mem_phys, cf->mem_size, driver_name)) {
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status = -ENXIO;
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dev_err(device, "Can't claim memory region\n");
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goto fail1;
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}
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if (!request_region(cf->io_base, cf->io_size, driver_name)) {
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status = -ENXIO;
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dev_err(device, "Can't claim I/O region\n");
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goto fail2;
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}
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cf->socket.owner = THIS_MODULE;
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cf->socket.dev.parent = &ofdev->dev;
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cf->socket.ops = &electra_cf_ops;
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cf->socket.resource_ops = &pccard_static_ops;
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cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
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SS_CAP_MEM_ALIGN;
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cf->socket.map_size = 0x800;
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status = pcmcia_register_socket(&cf->socket);
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if (status < 0) {
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dev_err(device, "pcmcia_register_socket failed\n");
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goto fail3;
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}
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dev_info(device, "at mem 0x%lx io 0x%llx irq %d\n",
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cf->mem_phys, io.start, cf->irq);
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cf->active = 1;
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electra_cf_timer(&cf->timer);
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return 0;
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fail3:
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release_region(cf->io_base, cf->io_size);
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fail2:
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release_mem_region(cf->mem_phys, cf->mem_size);
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fail1:
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if (cf->irq)
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free_irq(cf->irq, cf);
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iounmap(cf->gpio_base);
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out_unmap_virt:
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device_init_wakeup(&ofdev->dev, 0);
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iounmap(cf->io_virt);
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out_unmap_mem:
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iounmap(cf->mem_base);
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out_free_cf:
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kfree(cf);
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return status;
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}
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static int electra_cf_remove(struct platform_device *ofdev)
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{
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struct device *device = &ofdev->dev;
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struct electra_cf_socket *cf;
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cf = dev_get_drvdata(device);
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cf->active = 0;
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pcmcia_unregister_socket(&cf->socket);
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free_irq(cf->irq, cf);
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del_timer_sync(&cf->timer);
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iounmap(cf->io_virt);
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iounmap(cf->mem_base);
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iounmap(cf->gpio_base);
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release_mem_region(cf->mem_phys, cf->mem_size);
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release_region(cf->io_base, cf->io_size);
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kfree(cf);
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return 0;
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}
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static const struct of_device_id electra_cf_match[] = {
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{
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.compatible = "electra-cf",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, electra_cf_match);
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static struct platform_driver electra_cf_driver = {
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.driver = {
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.name = driver_name,
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.of_match_table = electra_cf_match,
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},
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.probe = electra_cf_probe,
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.remove = electra_cf_remove,
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};
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module_platform_driver(electra_cf_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
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MODULE_DESCRIPTION("PA Semi Electra CF driver");
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