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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright (C) 2007 PA Semi, Inc
0004  *
0005  * Maintained by: Olof Johansson <olof@lixom.net>
0006  *
0007  * Based on drivers/pcmcia/omap_cf.c
0008  */
0009 
0010 #include <linux/module.h>
0011 #include <linux/kernel.h>
0012 #include <linux/sched.h>
0013 #include <linux/platform_device.h>
0014 #include <linux/errno.h>
0015 #include <linux/init.h>
0016 #include <linux/delay.h>
0017 #include <linux/interrupt.h>
0018 #include <linux/mm.h>
0019 #include <linux/vmalloc.h>
0020 #include <linux/of_address.h>
0021 #include <linux/of_irq.h>
0022 #include <linux/of_platform.h>
0023 #include <linux/slab.h>
0024 
0025 #include <pcmcia/ss.h>
0026 
0027 static const char driver_name[] = "electra-cf";
0028 
0029 struct electra_cf_socket {
0030     struct pcmcia_socket    socket;
0031 
0032     struct timer_list   timer;
0033     unsigned        present:1;
0034     unsigned        active:1;
0035 
0036     struct platform_device  *ofdev;
0037     unsigned long       mem_phys;
0038     void __iomem        *mem_base;
0039     unsigned long       mem_size;
0040     void __iomem        *io_virt;
0041     unsigned int        io_base;
0042     unsigned int        io_size;
0043     u_int           irq;
0044     struct resource     iomem;
0045     void __iomem        *gpio_base;
0046     int         gpio_detect;
0047     int         gpio_vsense;
0048     int         gpio_3v;
0049     int         gpio_5v;
0050 };
0051 
0052 #define POLL_INTERVAL       (2 * HZ)
0053 
0054 
0055 static int electra_cf_present(struct electra_cf_socket *cf)
0056 {
0057     unsigned int gpio;
0058 
0059     gpio = in_le32(cf->gpio_base+0x40);
0060     return !(gpio & (1 << cf->gpio_detect));
0061 }
0062 
0063 static int electra_cf_ss_init(struct pcmcia_socket *s)
0064 {
0065     return 0;
0066 }
0067 
0068 /* the timer is primarily to kick this socket's pccardd */
0069 static void electra_cf_timer(struct timer_list *t)
0070 {
0071     struct electra_cf_socket *cf = from_timer(cf, t, timer);
0072     int present = electra_cf_present(cf);
0073 
0074     if (present != cf->present) {
0075         cf->present = present;
0076         pcmcia_parse_events(&cf->socket, SS_DETECT);
0077     }
0078 
0079     if (cf->active)
0080         mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
0081 }
0082 
0083 static irqreturn_t electra_cf_irq(int irq, void *_cf)
0084 {
0085     struct electra_cf_socket *cf = _cf;
0086 
0087     electra_cf_timer(&cf->timer);
0088     return IRQ_HANDLED;
0089 }
0090 
0091 static int electra_cf_get_status(struct pcmcia_socket *s, u_int *sp)
0092 {
0093     struct electra_cf_socket *cf;
0094 
0095     if (!sp)
0096         return -EINVAL;
0097 
0098     cf = container_of(s, struct electra_cf_socket, socket);
0099 
0100     /* NOTE CF is always 3VCARD */
0101     if (electra_cf_present(cf)) {
0102         *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
0103 
0104         s->pci_irq = cf->irq;
0105     } else
0106         *sp = 0;
0107     return 0;
0108 }
0109 
0110 static int electra_cf_set_socket(struct pcmcia_socket *sock,
0111                  struct socket_state_t *s)
0112 {
0113     unsigned int gpio;
0114     unsigned int vcc;
0115     struct electra_cf_socket *cf;
0116 
0117     cf = container_of(sock, struct electra_cf_socket, socket);
0118 
0119     /* "reset" means no power in our case */
0120     vcc = (s->flags & SS_RESET) ? 0 : s->Vcc;
0121 
0122     switch (vcc) {
0123     case 0:
0124         gpio = 0;
0125         break;
0126     case 33:
0127         gpio = (1 << cf->gpio_3v);
0128         break;
0129     case 5:
0130         gpio = (1 << cf->gpio_5v);
0131         break;
0132     default:
0133         return -EINVAL;
0134     }
0135 
0136     gpio |= 1 << (cf->gpio_3v + 16); /* enwr */
0137     gpio |= 1 << (cf->gpio_5v + 16); /* enwr */
0138     out_le32(cf->gpio_base+0x90, gpio);
0139 
0140     pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
0141         driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
0142 
0143     return 0;
0144 }
0145 
0146 static int electra_cf_set_io_map(struct pcmcia_socket *s,
0147                  struct pccard_io_map *io)
0148 {
0149     return 0;
0150 }
0151 
0152 static int electra_cf_set_mem_map(struct pcmcia_socket *s,
0153                   struct pccard_mem_map *map)
0154 {
0155     struct electra_cf_socket *cf;
0156 
0157     if (map->card_start)
0158         return -EINVAL;
0159     cf = container_of(s, struct electra_cf_socket, socket);
0160     map->static_start = cf->mem_phys;
0161     map->flags &= MAP_ACTIVE|MAP_ATTRIB;
0162     if (!(map->flags & MAP_ATTRIB))
0163         map->static_start += 0x800;
0164     return 0;
0165 }
0166 
0167 static struct pccard_operations electra_cf_ops = {
0168     .init           = electra_cf_ss_init,
0169     .get_status     = electra_cf_get_status,
0170     .set_socket     = electra_cf_set_socket,
0171     .set_io_map     = electra_cf_set_io_map,
0172     .set_mem_map        = electra_cf_set_mem_map,
0173 };
0174 
0175 static int electra_cf_probe(struct platform_device *ofdev)
0176 {
0177     struct device *device = &ofdev->dev;
0178     struct device_node *np = ofdev->dev.of_node;
0179     struct electra_cf_socket   *cf;
0180     struct resource mem, io;
0181     int status = -ENOMEM;
0182     const unsigned int *prop;
0183     int err;
0184 
0185     err = of_address_to_resource(np, 0, &mem);
0186     if (err)
0187         return -EINVAL;
0188 
0189     err = of_address_to_resource(np, 1, &io);
0190     if (err)
0191         return -EINVAL;
0192 
0193     cf = kzalloc(sizeof(*cf), GFP_KERNEL);
0194     if (!cf)
0195         return -ENOMEM;
0196 
0197     timer_setup(&cf->timer, electra_cf_timer, 0);
0198     cf->irq = 0;
0199 
0200     cf->ofdev = ofdev;
0201     cf->mem_phys = mem.start;
0202     cf->mem_size = PAGE_ALIGN(resource_size(&mem));
0203     cf->mem_base = ioremap(cf->mem_phys, cf->mem_size);
0204     if (!cf->mem_base)
0205         goto out_free_cf;
0206     cf->io_size = PAGE_ALIGN(resource_size(&io));
0207     cf->io_virt = ioremap_phb(io.start, cf->io_size);
0208     if (!cf->io_virt)
0209         goto out_unmap_mem;
0210 
0211     cf->gpio_base = ioremap(0xfc103000, 0x1000);
0212     if (!cf->gpio_base)
0213         goto out_unmap_virt;
0214     dev_set_drvdata(device, cf);
0215 
0216     cf->io_base = (unsigned long)cf->io_virt - VMALLOC_END;
0217     cf->iomem.start = (unsigned long)cf->mem_base;
0218     cf->iomem.end = (unsigned long)cf->mem_base + (mem.end - mem.start);
0219     cf->iomem.flags = IORESOURCE_MEM;
0220 
0221     cf->irq = irq_of_parse_and_map(np, 0);
0222 
0223     status = request_irq(cf->irq, electra_cf_irq, IRQF_SHARED,
0224                  driver_name, cf);
0225     if (status < 0) {
0226         dev_err(device, "request_irq failed\n");
0227         goto fail1;
0228     }
0229 
0230     cf->socket.pci_irq = cf->irq;
0231 
0232     status = -EINVAL;
0233 
0234     prop = of_get_property(np, "card-detect-gpio", NULL);
0235     if (!prop)
0236         goto fail1;
0237     cf->gpio_detect = *prop;
0238 
0239     prop = of_get_property(np, "card-vsense-gpio", NULL);
0240     if (!prop)
0241         goto fail1;
0242     cf->gpio_vsense = *prop;
0243 
0244     prop = of_get_property(np, "card-3v-gpio", NULL);
0245     if (!prop)
0246         goto fail1;
0247     cf->gpio_3v = *prop;
0248 
0249     prop = of_get_property(np, "card-5v-gpio", NULL);
0250     if (!prop)
0251         goto fail1;
0252     cf->gpio_5v = *prop;
0253 
0254     cf->socket.io_offset = cf->io_base;
0255 
0256     /* reserve chip-select regions */
0257     if (!request_mem_region(cf->mem_phys, cf->mem_size, driver_name)) {
0258         status = -ENXIO;
0259         dev_err(device, "Can't claim memory region\n");
0260         goto fail1;
0261     }
0262 
0263     if (!request_region(cf->io_base, cf->io_size, driver_name)) {
0264         status = -ENXIO;
0265         dev_err(device, "Can't claim I/O region\n");
0266         goto fail2;
0267     }
0268 
0269     cf->socket.owner = THIS_MODULE;
0270     cf->socket.dev.parent = &ofdev->dev;
0271     cf->socket.ops = &electra_cf_ops;
0272     cf->socket.resource_ops = &pccard_static_ops;
0273     cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
0274                 SS_CAP_MEM_ALIGN;
0275     cf->socket.map_size = 0x800;
0276 
0277     status = pcmcia_register_socket(&cf->socket);
0278     if (status < 0) {
0279         dev_err(device, "pcmcia_register_socket failed\n");
0280         goto fail3;
0281     }
0282 
0283     dev_info(device, "at mem 0x%lx io 0x%llx irq %d\n",
0284          cf->mem_phys, io.start, cf->irq);
0285 
0286     cf->active = 1;
0287     electra_cf_timer(&cf->timer);
0288     return 0;
0289 
0290 fail3:
0291     release_region(cf->io_base, cf->io_size);
0292 fail2:
0293     release_mem_region(cf->mem_phys, cf->mem_size);
0294 fail1:
0295     if (cf->irq)
0296         free_irq(cf->irq, cf);
0297 
0298     iounmap(cf->gpio_base);
0299 out_unmap_virt:
0300     device_init_wakeup(&ofdev->dev, 0);
0301     iounmap(cf->io_virt);
0302 out_unmap_mem:
0303     iounmap(cf->mem_base);
0304 out_free_cf:
0305     kfree(cf);
0306     return status;
0307 
0308 }
0309 
0310 static int electra_cf_remove(struct platform_device *ofdev)
0311 {
0312     struct device *device = &ofdev->dev;
0313     struct electra_cf_socket *cf;
0314 
0315     cf = dev_get_drvdata(device);
0316 
0317     cf->active = 0;
0318     pcmcia_unregister_socket(&cf->socket);
0319     free_irq(cf->irq, cf);
0320     del_timer_sync(&cf->timer);
0321 
0322     iounmap(cf->io_virt);
0323     iounmap(cf->mem_base);
0324     iounmap(cf->gpio_base);
0325     release_mem_region(cf->mem_phys, cf->mem_size);
0326     release_region(cf->io_base, cf->io_size);
0327 
0328     kfree(cf);
0329 
0330     return 0;
0331 }
0332 
0333 static const struct of_device_id electra_cf_match[] = {
0334     {
0335         .compatible   = "electra-cf",
0336     },
0337     {},
0338 };
0339 MODULE_DEVICE_TABLE(of, electra_cf_match);
0340 
0341 static struct platform_driver electra_cf_driver = {
0342     .driver = {
0343         .name = driver_name,
0344         .of_match_table = electra_cf_match,
0345     },
0346     .probe    = electra_cf_probe,
0347     .remove   = electra_cf_remove,
0348 };
0349 
0350 module_platform_driver(electra_cf_driver);
0351 
0352 MODULE_LICENSE("GPL");
0353 MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
0354 MODULE_DESCRIPTION("PA Semi Electra CF driver");
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