cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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viper-pcmcia.c (4135B)

      1/*
      2 * Viper/Zeus PCMCIA support
      3 *   Copyright 2004 Arcom Control Systems
      4 *
      5 * Maintained by Marc Zyngier <maz@misterjones.org>
      6 *
      7 * Based on:
      8 *   iPAQ h2200 PCMCIA support
      9 *   Copyright 2004 Koen Kooi <koen@vestingbar.nl>
     10 *
     11 * This file is subject to the terms and conditions of the GNU General Public
     12 * License.  See the file COPYING in the main directory of this archive for
     13 * more details.
     14 */
     15
     16#include <linux/module.h>
     17#include <linux/init.h>
     18#include <linux/kernel.h>
     19#include <linux/errno.h>
     20#include <linux/interrupt.h>
     21#include <linux/platform_device.h>
     22#include <linux/gpio.h>
     23
     24#include <pcmcia/ss.h>
     25#include <pcmcia/soc_common.h>
     26
     27#include <asm/irq.h>
     28
     29#include "viper-pcmcia.h"
     30
     31static struct platform_device *arcom_pcmcia_dev;
     32
     33static inline struct arcom_pcmcia_pdata *viper_get_pdata(void)
     34{
     35	return arcom_pcmcia_dev->dev.platform_data;
     36}
     37
     38static int viper_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
     39{
     40	struct arcom_pcmcia_pdata *pdata = viper_get_pdata();
     41	unsigned long flags;
     42
     43	skt->stat[SOC_STAT_CD].gpio = pdata->cd_gpio;
     44	skt->stat[SOC_STAT_CD].name = "PCMCIA_CD";
     45	skt->stat[SOC_STAT_RDY].gpio = pdata->rdy_gpio;
     46	skt->stat[SOC_STAT_RDY].name = "CF ready";
     47
     48	if (gpio_request(pdata->pwr_gpio, "CF power"))
     49		goto err_request_pwr;
     50
     51	local_irq_save(flags);
     52
     53	if (gpio_direction_output(pdata->pwr_gpio, 0)) {
     54		local_irq_restore(flags);
     55		goto err_dir;
     56	}
     57
     58	local_irq_restore(flags);
     59
     60	return 0;
     61
     62err_dir:
     63	gpio_free(pdata->pwr_gpio);
     64err_request_pwr:
     65	dev_err(&arcom_pcmcia_dev->dev, "Failed to setup PCMCIA GPIOs\n");
     66	return -1;
     67}
     68
     69/*
     70 * Release all resources.
     71 */
     72static void viper_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
     73{
     74	struct arcom_pcmcia_pdata *pdata = viper_get_pdata();
     75
     76	gpio_free(pdata->pwr_gpio);
     77}
     78
     79static void viper_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
     80				      struct pcmcia_state *state)
     81{
     82	state->vs_3v  = 1; /* Can only apply 3.3V */
     83	state->vs_Xv  = 0;
     84}
     85
     86static int viper_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
     87					 const socket_state_t *state)
     88{
     89	struct arcom_pcmcia_pdata *pdata = viper_get_pdata();
     90
     91	/* Silently ignore Vpp, output enable, speaker enable. */
     92	pdata->reset(state->flags & SS_RESET);
     93
     94	/* Apply socket voltage */
     95	switch (state->Vcc) {
     96	case 0:
     97		gpio_set_value(pdata->pwr_gpio, 0);
     98		break;
     99	case 33:
    100		gpio_set_value(pdata->pwr_gpio, 1);
    101		break;
    102	default:
    103		dev_err(&arcom_pcmcia_dev->dev, "Unsupported Vcc:%d\n", state->Vcc);
    104		return -1;
    105	}
    106
    107	return 0;
    108}
    109
    110static struct pcmcia_low_level viper_pcmcia_ops = {
    111	.owner          	= THIS_MODULE,
    112	.hw_init        	= viper_pcmcia_hw_init,
    113	.hw_shutdown		= viper_pcmcia_hw_shutdown,
    114	.socket_state		= viper_pcmcia_socket_state,
    115	.configure_socket	= viper_pcmcia_configure_socket,
    116	.nr         		= 1,
    117};
    118
    119static struct platform_device *viper_pcmcia_device;
    120
    121static int viper_pcmcia_probe(struct platform_device *pdev)
    122{
    123	int ret;
    124
    125	/* I can't imagine more than one device, but you never know... */
    126	if (arcom_pcmcia_dev)
    127		return -EEXIST;
    128
    129	if (!pdev->dev.platform_data)
    130		return -EINVAL;
    131
    132	viper_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
    133	if (!viper_pcmcia_device)
    134		return -ENOMEM;
    135
    136	arcom_pcmcia_dev = pdev;
    137
    138	viper_pcmcia_device->dev.parent = &pdev->dev;
    139
    140	ret = platform_device_add_data(viper_pcmcia_device,
    141				       &viper_pcmcia_ops,
    142				       sizeof(viper_pcmcia_ops));
    143
    144	if (!ret)
    145		ret = platform_device_add(viper_pcmcia_device);
    146
    147	if (ret) {
    148		platform_device_put(viper_pcmcia_device);
    149		arcom_pcmcia_dev = NULL;
    150	}
    151
    152	return ret;
    153}
    154
    155static int viper_pcmcia_remove(struct platform_device *pdev)
    156{
    157	platform_device_unregister(viper_pcmcia_device);
    158	arcom_pcmcia_dev = NULL;
    159	return 0;
    160}
    161
    162static struct platform_device_id viper_pcmcia_id_table[] = {
    163	{ .name = "viper-pcmcia", },
    164	{ .name = "zeus-pcmcia",  },
    165	{ },
    166};
    167
    168static struct platform_driver viper_pcmcia_driver = {
    169	.probe		= viper_pcmcia_probe,
    170	.remove		= viper_pcmcia_remove,
    171	.driver		= {
    172		.name	= "arcom-pcmcia",
    173	},
    174	.id_table	= viper_pcmcia_id_table,
    175};
    176
    177module_platform_driver(viper_pcmcia_driver);
    178
    179MODULE_DEVICE_TABLE(platform, viper_pcmcia_id_table);
    180MODULE_LICENSE("GPL");