153 lines
3.9 KiB
C
153 lines
3.9 KiB
C
/*
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* linux/drivers/pcmcia/pxa2xx_balloon3.c
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*
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* Balloon3 PCMCIA specific routines.
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*
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* Author: Nick Bane
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* Created: June, 2006
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* Copyright: Toby Churchill Ltd
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* Derived from pxa2xx_mainstone.c, by Nico Pitre
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*
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* Various modification by Marek Vasut <marek.vasut@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <mach/balloon3.h>
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#include <asm/mach-types.h>
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#include "soc_common.h"
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/*
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* These are a list of interrupt sources that provokes a polled
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* check of status
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*/
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static struct pcmcia_irqs irqs[] = {
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{ 0, BALLOON3_S0_CD_IRQ, "PCMCIA0 CD" },
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{ 0, BALLOON3_BP_NSTSCHG_IRQ, "PCMCIA0 STSCHG" },
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};
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static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
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{
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uint16_t ver;
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ver = __raw_readw(BALLOON3_FPGA_VER);
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if (ver < 0x4f08)
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pr_warn("The FPGA code, version 0x%04x, is too old. "
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"PCMCIA/CF support might be broken in this version!",
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ver);
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skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
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return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
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}
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static void balloon3_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
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{
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soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
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}
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static unsigned long balloon3_pcmcia_status[2] = {
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BALLOON3_CF_nSTSCHG_BVD1,
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BALLOON3_CF_nSTSCHG_BVD1
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};
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static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
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struct pcmcia_state *state)
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{
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uint16_t status;
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int flip;
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/* This actually reads the STATUS register */
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status = __raw_readw(BALLOON3_CF_STATUS_REG);
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flip = (status ^ balloon3_pcmcia_status[skt->nr])
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& BALLOON3_CF_nSTSCHG_BVD1;
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/*
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* Workaround for STSCHG which can't be deasserted:
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* We therefore disable/enable corresponding IRQs
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* as needed to avoid IRQ locks.
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*/
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if (flip) {
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balloon3_pcmcia_status[skt->nr] = status;
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if (status & BALLOON3_CF_nSTSCHG_BVD1)
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enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
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else
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disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
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}
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state->detect = !gpio_get_value(BALLOON3_GPIO_S0_CD);
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state->ready = !!(status & BALLOON3_CF_nIRQ);
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state->bvd1 = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
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state->bvd2 = 0; /* not available */
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state->vs_3v = 1; /* Always true its a CF card */
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state->vs_Xv = 0; /* not available */
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state->wrprot = 0; /* not available */
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}
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static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
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const socket_state_t *state)
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{
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__raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG +
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((state->flags & SS_RESET) ?
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BALLOON3_FPGA_SETnCLR : 0));
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return 0;
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}
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static struct pcmcia_low_level balloon3_pcmcia_ops = {
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.owner = THIS_MODULE,
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.hw_init = balloon3_pcmcia_hw_init,
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.hw_shutdown = balloon3_pcmcia_hw_shutdown,
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.socket_state = balloon3_pcmcia_socket_state,
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.configure_socket = balloon3_pcmcia_configure_socket,
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.first = 0,
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.nr = 1,
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};
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static struct platform_device *balloon3_pcmcia_device;
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static int __init balloon3_pcmcia_init(void)
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{
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int ret;
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if (!machine_is_balloon3())
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return -ENODEV;
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balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
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if (!balloon3_pcmcia_device)
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return -ENOMEM;
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ret = platform_device_add_data(balloon3_pcmcia_device,
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&balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
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if (!ret)
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ret = platform_device_add(balloon3_pcmcia_device);
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if (ret)
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platform_device_put(balloon3_pcmcia_device);
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return ret;
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}
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static void __exit balloon3_pcmcia_exit(void)
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{
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platform_device_unregister(balloon3_pcmcia_device);
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}
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module_init(balloon3_pcmcia_init);
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module_exit(balloon3_pcmcia_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
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MODULE_ALIAS("platform:pxa2xx-pcmcia");
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MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");
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