diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/pcmcia/xxs1500_ss.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/drivers/pcmcia/xxs1500_ss.c b/drivers/pcmcia/xxs1500_ss.c new file mode 100644 index 000000000..b11c7abb1 --- /dev/null +++ b/drivers/pcmcia/xxs1500_ss.c @@ -0,0 +1,328 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PCMCIA socket code for the MyCable XXS1500 system. + * + * Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com> + * + */ + +#include <linux/delay.h> +#include <linux/gpio.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/resource.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#include <pcmcia/ss.h> +#include <pcmcia/cistpl.h> + +#include <asm/irq.h> +#include <asm/mach-au1x00/au1000.h> + +#define MEM_MAP_SIZE 0x400000 +#define IO_MAP_SIZE 0x1000 + + +/* + * 3.3V cards only; all interfacing is done via gpios: + * + * 0/1: carddetect (00 = card present, xx = huh) + * 4: card irq + * 204: reset (high-act) + * 205: buffer enable (low-act) + * 208/209: card voltage key (00,01,10,11) + * 210: battwarn + * 211: batdead + * 214: power (low-act) + */ +#define GPIO_CDA 0 +#define GPIO_CDB 1 +#define GPIO_CARDIRQ 4 +#define GPIO_RESET 204 +#define GPIO_OUTEN 205 +#define GPIO_VSL 208 +#define GPIO_VSH 209 +#define GPIO_BATTDEAD 210 +#define GPIO_BATTWARN 211 +#define GPIO_POWER 214 + +struct xxs1500_pcmcia_sock { + struct pcmcia_socket socket; + void *virt_io; + + phys_addr_t phys_io; + phys_addr_t phys_attr; + phys_addr_t phys_mem; + + /* previous flags for set_socket() */ + unsigned int old_flags; +}; + +#define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket) + +static irqreturn_t cdirq(int irq, void *data) +{ + struct xxs1500_pcmcia_sock *sock = data; + + pcmcia_parse_events(&sock->socket, SS_DETECT); + + return IRQ_HANDLED; +} + +static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt, + struct socket_state_t *state) +{ + struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); + unsigned int changed; + + /* power control */ + switch (state->Vcc) { + case 0: + gpio_set_value(GPIO_POWER, 1); /* power off */ + break; + case 33: + gpio_set_value(GPIO_POWER, 0); /* power on */ + break; + case 50: + default: + return -EINVAL; + } + + changed = state->flags ^ sock->old_flags; + + if (changed & SS_RESET) { + if (state->flags & SS_RESET) { + gpio_set_value(GPIO_RESET, 1); /* assert reset */ + gpio_set_value(GPIO_OUTEN, 1); /* buffers off */ + } else { + gpio_set_value(GPIO_RESET, 0); /* deassert reset */ + gpio_set_value(GPIO_OUTEN, 0); /* buffers on */ + msleep(500); + } + } + + sock->old_flags = state->flags; + + return 0; +} + +static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt, + unsigned int *value) +{ + unsigned int status; + int i; + + status = 0; + + /* check carddetects: GPIO[0:1] must both be low */ + if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB)) + status |= SS_DETECT; + + /* determine card voltage: GPIO[208:209] binary value */ + i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1); + + switch (i) { + case 0: + case 1: + case 2: + status |= SS_3VCARD; /* 3V card */ + break; + case 3: /* 5V card, unsupported */ + default: + status |= SS_XVCARD; /* treated as unsupported in core */ + } + + /* GPIO214: low active power switch */ + status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON; + + /* GPIO204: high-active reset line */ + status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY; + + /* other stuff */ + status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD; + status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN; + + *value = status; + + return 0; +} + +static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt) +{ + gpio_direction_input(GPIO_CDA); + gpio_direction_input(GPIO_CDB); + gpio_direction_input(GPIO_VSL); + gpio_direction_input(GPIO_VSH); + gpio_direction_input(GPIO_BATTDEAD); + gpio_direction_input(GPIO_BATTWARN); + gpio_direction_output(GPIO_RESET, 1); /* assert reset */ + gpio_direction_output(GPIO_OUTEN, 1); /* disable buffers */ + gpio_direction_output(GPIO_POWER, 1); /* power off */ + + return 0; +} + +static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt) +{ + return 0; +} + +static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt, + struct pccard_io_map *map) +{ + struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); + + map->start = (u32)sock->virt_io; + map->stop = map->start + IO_MAP_SIZE; + + return 0; +} + +static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt, + struct pccard_mem_map *map) +{ + struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); + + if (map->flags & MAP_ATTRIB) + map->static_start = sock->phys_attr + map->card_start; + else + map->static_start = sock->phys_mem + map->card_start; + + return 0; +} + +static struct pccard_operations xxs1500_pcmcia_operations = { + .init = xxs1500_pcmcia_sock_init, + .suspend = xxs1500_pcmcia_sock_suspend, + .get_status = xxs1500_pcmcia_get_status, + .set_socket = xxs1500_pcmcia_configure, + .set_io_map = au1x00_pcmcia_set_io_map, + .set_mem_map = au1x00_pcmcia_set_mem_map, +}; + +static int xxs1500_pcmcia_probe(struct platform_device *pdev) +{ + struct xxs1500_pcmcia_sock *sock; + struct resource *r; + int ret, irq; + + sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL); + if (!sock) + return -ENOMEM; + + ret = -ENODEV; + + /* 36bit PCMCIA Attribute area address */ + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr"); + if (!r) { + dev_err(&pdev->dev, "missing 'pcmcia-attr' resource!\n"); + goto out0; + } + sock->phys_attr = r->start; + + /* 36bit PCMCIA Memory area address */ + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem"); + if (!r) { + dev_err(&pdev->dev, "missing 'pcmcia-mem' resource!\n"); + goto out0; + } + sock->phys_mem = r->start; + + /* 36bit PCMCIA IO area address */ + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io"); + if (!r) { + dev_err(&pdev->dev, "missing 'pcmcia-io' resource!\n"); + goto out0; + } + sock->phys_io = r->start; + + + /* + * PCMCIA client drivers use the inb/outb macros to access + * the IO registers. Since mips_io_port_base is added + * to the access address of the mips implementation of + * inb/outb, we need to subtract it here because we want + * to access the I/O or MEM address directly, without + * going through this "mips_io_port_base" mechanism. + */ + sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) - + mips_io_port_base); + + if (!sock->virt_io) { + dev_err(&pdev->dev, "cannot remap IO area\n"); + ret = -ENOMEM; + goto out0; + } + + sock->socket.ops = &xxs1500_pcmcia_operations; + sock->socket.owner = THIS_MODULE; + sock->socket.pci_irq = gpio_to_irq(GPIO_CARDIRQ); + sock->socket.features = SS_CAP_STATIC_MAP | SS_CAP_PCCARD; + sock->socket.map_size = MEM_MAP_SIZE; + sock->socket.io_offset = (unsigned long)sock->virt_io; + sock->socket.dev.parent = &pdev->dev; + sock->socket.resource_ops = &pccard_static_ops; + + platform_set_drvdata(pdev, sock); + + /* setup carddetect irq: use one of the 2 GPIOs as an + * edge detector. + */ + irq = gpio_to_irq(GPIO_CDA); + irq_set_irq_type(irq, IRQ_TYPE_EDGE_BOTH); + ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock); + if (ret) { + dev_err(&pdev->dev, "cannot setup cd irq\n"); + goto out1; + } + + ret = pcmcia_register_socket(&sock->socket); + if (ret) { + dev_err(&pdev->dev, "failed to register\n"); + goto out2; + } + + printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n"); + + return 0; + +out2: + free_irq(gpio_to_irq(GPIO_CDA), sock); +out1: + iounmap((void *)(sock->virt_io + (u32)mips_io_port_base)); +out0: + kfree(sock); + return ret; +} + +static int xxs1500_pcmcia_remove(struct platform_device *pdev) +{ + struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev); + + pcmcia_unregister_socket(&sock->socket); + free_irq(gpio_to_irq(GPIO_CDA), sock); + iounmap((void *)(sock->virt_io + (u32)mips_io_port_base)); + kfree(sock); + + return 0; +} + +static struct platform_driver xxs1500_pcmcia_socket_driver = { + .driver = { + .name = "xxs1500_pcmcia", + }, + .probe = xxs1500_pcmcia_probe, + .remove = xxs1500_pcmcia_remove, +}; + +module_platform_driver(xxs1500_pcmcia_socket_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems"); +MODULE_AUTHOR("Manuel Lauss"); |