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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pxa2xx_mainstone.c (3065B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * linux/drivers/pcmcia/pxa2xx_mainstone.c
      4 *
      5 * Mainstone PCMCIA specific routines.
      6 *
      7 * Created:	May 12, 2004
      8 * Author:	Nicolas Pitre
      9 * Copyright:	MontaVista Software Inc.
     10 */
     11#include <linux/gpio/consumer.h>
     12#include <linux/module.h>
     13#include <linux/init.h>
     14#include <linux/interrupt.h>
     15#include <linux/kernel.h>
     16#include <linux/errno.h>
     17#include <linux/platform_device.h>
     18
     19#include <pcmcia/ss.h>
     20
     21#include <asm/mach-types.h>
     22
     23#include "soc_common.h"
     24#include "max1600.h"
     25
     26static int mst_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
     27{
     28	struct device *dev = skt->socket.dev.parent;
     29	struct max1600 *m;
     30	int ret;
     31
     32	skt->stat[SOC_STAT_CD].name = skt->nr ? "bdetect" : "adetect";
     33	skt->stat[SOC_STAT_BVD1].name = skt->nr ? "bbvd1" : "abvd1";
     34	skt->stat[SOC_STAT_BVD2].name = skt->nr ? "bbvd2" : "abvd2";
     35	skt->stat[SOC_STAT_RDY].name = skt->nr ? "bready" : "aready";
     36	skt->stat[SOC_STAT_VS1].name = skt->nr ? "bvs1" : "avs1";
     37	skt->stat[SOC_STAT_VS2].name = skt->nr ? "bvs2" : "avs2";
     38
     39	skt->gpio_reset = devm_gpiod_get(dev, skt->nr ? "breset" : "areset",
     40					 GPIOD_OUT_HIGH);
     41	if (IS_ERR(skt->gpio_reset))
     42		return PTR_ERR(skt->gpio_reset);
     43
     44	ret = max1600_init(dev, &m, skt->nr ? MAX1600_CHAN_B : MAX1600_CHAN_A,
     45			   MAX1600_CODE_HIGH);
     46	if (ret)
     47		return ret;
     48
     49	skt->driver_data = m;
     50
     51	return soc_pcmcia_request_gpiods(skt);
     52}
     53
     54static unsigned int mst_pcmcia_bvd1_status[2];
     55
     56static void mst_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
     57				    struct pcmcia_state *state)
     58{
     59	unsigned int flip = mst_pcmcia_bvd1_status[skt->nr] ^ state->bvd1;
     60
     61	/*
     62	 * Workaround for STSCHG which can't be deasserted:
     63	 * We therefore disable/enable corresponding IRQs
     64	 * as needed to avoid IRQ locks.
     65	 */
     66	if (flip) {
     67		mst_pcmcia_bvd1_status[skt->nr] = state->bvd1;
     68		if (state->bvd1)
     69			enable_irq(skt->stat[SOC_STAT_BVD1].irq);
     70		else
     71			disable_irq(skt->stat[SOC_STAT_BVD2].irq);
     72	}
     73}
     74
     75static int mst_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
     76				       const socket_state_t *state)
     77{
     78	return max1600_configure(skt->driver_data, state->Vcc, state->Vpp);
     79}
     80
     81static struct pcmcia_low_level mst_pcmcia_ops __initdata = {
     82	.owner			= THIS_MODULE,
     83	.hw_init		= mst_pcmcia_hw_init,
     84	.socket_state		= mst_pcmcia_socket_state,
     85	.configure_socket	= mst_pcmcia_configure_socket,
     86	.nr			= 2,
     87};
     88
     89static struct platform_device *mst_pcmcia_device;
     90
     91static int __init mst_pcmcia_init(void)
     92{
     93	int ret;
     94
     95	if (!machine_is_mainstone())
     96		return -ENODEV;
     97
     98	mst_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
     99	if (!mst_pcmcia_device)
    100		return -ENOMEM;
    101
    102	ret = platform_device_add_data(mst_pcmcia_device, &mst_pcmcia_ops,
    103				       sizeof(mst_pcmcia_ops));
    104	if (ret == 0)
    105		ret = platform_device_add(mst_pcmcia_device);
    106
    107	if (ret)
    108		platform_device_put(mst_pcmcia_device);
    109
    110	return ret;
    111}
    112
    113static void __exit mst_pcmcia_exit(void)
    114{
    115	platform_device_unregister(mst_pcmcia_device);
    116}
    117
    118fs_initcall(mst_pcmcia_init);
    119module_exit(mst_pcmcia_exit);
    120
    121MODULE_LICENSE("GPL");
    122MODULE_ALIAS("platform:pxa2xx-pcmcia");