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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sa1111_lubbock.c (3495B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * linux/drivers/pcmcia/pxa2xx_lubbock.c
      4 *
      5 * Author:	George Davis
      6 * Created:	Jan 10, 2002
      7 * Copyright:	MontaVista Software Inc.
      8 *
      9 * Originally based upon linux/drivers/pcmcia/sa1100_neponset.c
     10 *
     11 * Lubbock PCMCIA specific routines.
     12 */
     13#include <linux/module.h>
     14#include <linux/kernel.h>
     15#include <linux/device.h>
     16#include <linux/errno.h>
     17#include <linux/init.h>
     18#include <linux/delay.h>
     19
     20#include <asm/hardware/sa1111.h>
     21#include <asm/mach-types.h>
     22
     23#include "sa1111_generic.h"
     24#include "max1600.h"
     25
     26static int lubbock_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
     27{
     28	struct max1600 *m;
     29	int ret;
     30
     31	ret = max1600_init(skt->socket.dev.parent, &m,
     32			   skt->nr ? MAX1600_CHAN_B : MAX1600_CHAN_A,
     33			   MAX1600_CODE_HIGH);
     34	if (ret == 0)
     35		skt->driver_data = m;
     36
     37	return ret;
     38}
     39
     40static int
     41lubbock_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
     42				const socket_state_t *state)
     43{
     44	struct max1600 *m = skt->driver_data;
     45	int ret = 0;
     46
     47	/* Lubbock uses the Maxim MAX1602, with the following connections:
     48	 *
     49	 * Socket 0 (PCMCIA):
     50	 *	MAX1602	Lubbock		Register
     51	 *	Pin	Signal
     52	 *	-----	-------		----------------------
     53	 *	A0VPP	S0_PWR0		SA-1111 GPIO A<0>
     54	 *	A1VPP	S0_PWR1		SA-1111 GPIO A<1>
     55	 *	A0VCC	S0_PWR2		SA-1111 GPIO A<2>
     56	 *	A1VCC	S0_PWR3		SA-1111 GPIO A<3>
     57	 *	VX	VCC
     58	 *	VY	+3.3V
     59	 *	12IN	+12V
     60	 *	CODE	+3.3V		Cirrus  Code, CODE = High (VY)
     61	 *
     62	 * Socket 1 (CF):
     63	 *	MAX1602	Lubbock		Register
     64	 *	Pin	Signal
     65	 *	-----	-------		----------------------
     66	 *	A0VPP	GND		VPP is not connected
     67	 *	A1VPP	GND		VPP is not connected
     68	 *	A0VCC	S1_PWR0		MISC_WR<14>
     69	 *	A1VCC	S1_PWR1		MISC_WR<15>
     70	 *	VX	VCC
     71	 *	VY	+3.3V
     72	 *	12IN	GND		VPP is not connected
     73	 *	CODE	+3.3V		Cirrus  Code, CODE = High (VY)
     74	 *
     75	 */
     76
     77 again:
     78	switch (skt->nr) {
     79	case 0:
     80	case 1:
     81		break;
     82
     83	default:
     84		ret = -1;
     85	}
     86
     87	if (ret == 0)
     88		ret = sa1111_pcmcia_configure_socket(skt, state);
     89	if (ret == 0)
     90		ret = max1600_configure(m, state->Vcc, state->Vpp);
     91
     92#if 1
     93	if (ret == 0 && state->Vcc == 33) {
     94		struct pcmcia_state new_state;
     95
     96		/*
     97		 * HACK ALERT:
     98		 * We can't sense the voltage properly on Lubbock before
     99		 * actually applying some power to the socket (catch 22).
    100		 * Resense the socket Voltage Sense pins after applying
    101		 * socket power.
    102		 *
    103		 * Note: It takes about 2.5ms for the MAX1602 VCC output
    104		 * to rise.
    105		 */
    106		mdelay(3);
    107
    108		sa1111_pcmcia_socket_state(skt, &new_state);
    109
    110		if (!new_state.vs_3v && !new_state.vs_Xv) {
    111			/*
    112			 * Switch to 5V,  Configure socket with 5V voltage
    113			 */
    114			max1600_configure(m, 0, 0);
    115
    116			/*
    117			 * It takes about 100ms to turn off Vcc.
    118			 */
    119			mdelay(100);
    120
    121			/*
    122			 * We need to hack around the const qualifier as
    123			 * well to keep this ugly workaround localized and
    124			 * not force it to the rest of the code. Barf bags
    125			 * available in the seat pocket in front of you!
    126			 */
    127			((socket_state_t *)state)->Vcc = 50;
    128			((socket_state_t *)state)->Vpp = 50;
    129			goto again;
    130		}
    131	}
    132#endif
    133
    134	return ret;
    135}
    136
    137static struct pcmcia_low_level lubbock_pcmcia_ops = {
    138	.owner			= THIS_MODULE,
    139	.hw_init		= lubbock_pcmcia_hw_init,
    140	.configure_socket	= lubbock_pcmcia_configure_socket,
    141	.first			= 0,
    142	.nr			= 2,
    143};
    144
    145#include "pxa2xx_base.h"
    146
    147int pcmcia_lubbock_init(struct sa1111_dev *sadev)
    148{
    149	pxa2xx_drv_pcmcia_ops(&lubbock_pcmcia_ops);
    150	pxa2xx_configure_sockets(&sadev->dev, &lubbock_pcmcia_ops);
    151	return sa1111_pcmcia_add(sadev, &lubbock_pcmcia_ops,
    152				 pxa2xx_drv_pcmcia_add_one);
    153}
    154
    155MODULE_LICENSE("GPL");