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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balloon3-pcmcia.c (3510B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * linux/drivers/pcmcia/pxa2xx_balloon3.c
      4 *
      5 * Balloon3 PCMCIA specific routines.
      6 *
      7 *  Author:	Nick Bane
      8 *  Created:	June, 2006
      9 *  Copyright:	Toby Churchill Ltd
     10 *  Derived from pxa2xx_mainstone.c, by Nico Pitre
     11 *
     12 * Various modification by Marek Vasut <marek.vasut@gmail.com>
     13 */
     14
     15#include <linux/module.h>
     16#include <linux/gpio.h>
     17#include <linux/errno.h>
     18#include <linux/interrupt.h>
     19#include <linux/platform_device.h>
     20#include <linux/irq.h>
     21#include <linux/io.h>
     22
     23#include "balloon3.h"
     24
     25#include <asm/mach-types.h>
     26
     27#include <pcmcia/soc_common.h>
     28
     29static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
     30{
     31	uint16_t ver;
     32
     33	ver = __raw_readw(BALLOON3_FPGA_VER);
     34	if (ver < 0x4f08)
     35		pr_warn("The FPGA code, version 0x%04x, is too old. "
     36			"PCMCIA/CF support might be broken in this version!",
     37			ver);
     38
     39	skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
     40	skt->stat[SOC_STAT_CD].gpio = BALLOON3_GPIO_S0_CD;
     41	skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
     42	skt->stat[SOC_STAT_BVD1].irq = BALLOON3_BP_NSTSCHG_IRQ;
     43	skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";
     44
     45	return 0;
     46}
     47
     48static unsigned long balloon3_pcmcia_status[2] = {
     49	BALLOON3_CF_nSTSCHG_BVD1,
     50	BALLOON3_CF_nSTSCHG_BVD1
     51};
     52
     53static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
     54				    struct pcmcia_state *state)
     55{
     56	uint16_t status;
     57	int flip;
     58
     59	/* This actually reads the STATUS register */
     60	status = __raw_readw(BALLOON3_CF_STATUS_REG);
     61	flip = (status ^ balloon3_pcmcia_status[skt->nr])
     62		& BALLOON3_CF_nSTSCHG_BVD1;
     63	/*
     64	 * Workaround for STSCHG which can't be deasserted:
     65	 * We therefore disable/enable corresponding IRQs
     66	 * as needed to avoid IRQ locks.
     67	 */
     68	if (flip) {
     69		balloon3_pcmcia_status[skt->nr] = status;
     70		if (status & BALLOON3_CF_nSTSCHG_BVD1)
     71			enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
     72		else
     73			disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
     74	}
     75
     76	state->ready	= !!(status & BALLOON3_CF_nIRQ);
     77	state->bvd1	= !!(status & BALLOON3_CF_nSTSCHG_BVD1);
     78	state->bvd2	= 0;	/* not available */
     79	state->vs_3v	= 1;	/* Always true its a CF card */
     80	state->vs_Xv	= 0;	/* not available */
     81}
     82
     83static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
     84				       const socket_state_t *state)
     85{
     86	__raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG +
     87			((state->flags & SS_RESET) ?
     88			BALLOON3_FPGA_SETnCLR : 0));
     89	return 0;
     90}
     91
     92static struct pcmcia_low_level balloon3_pcmcia_ops = {
     93	.owner			= THIS_MODULE,
     94	.hw_init		= balloon3_pcmcia_hw_init,
     95	.socket_state		= balloon3_pcmcia_socket_state,
     96	.configure_socket	= balloon3_pcmcia_configure_socket,
     97	.first			= 0,
     98	.nr			= 1,
     99};
    100
    101static struct platform_device *balloon3_pcmcia_device;
    102
    103static int __init balloon3_pcmcia_init(void)
    104{
    105	int ret;
    106
    107	if (!machine_is_balloon3())
    108		return -ENODEV;
    109
    110	balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
    111	if (!balloon3_pcmcia_device)
    112		return -ENOMEM;
    113
    114	ret = platform_device_add_data(balloon3_pcmcia_device,
    115			&balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
    116
    117	if (!ret)
    118		ret = platform_device_add(balloon3_pcmcia_device);
    119
    120	if (ret)
    121		platform_device_put(balloon3_pcmcia_device);
    122
    123	return ret;
    124}
    125
    126static void __exit balloon3_pcmcia_exit(void)
    127{
    128	platform_device_unregister(balloon3_pcmcia_device);
    129}
    130
    131module_init(balloon3_pcmcia_init);
    132module_exit(balloon3_pcmcia_exit);
    133
    134MODULE_LICENSE("GPL");
    135MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
    136MODULE_ALIAS("platform:pxa2xx-pcmcia");
    137MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");