pxa2xx_lubbock.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 268 行

/*
 * linux/drivers/pcmcia/pxa2xx_lubbock.c
 *
 * Author:	George Davis
 * Created:	Jan 10, 2002
 * Copyright:	MontaVista Software Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Originally based upon linux/drivers/pcmcia/sa1100_neponset.c
 *
 * Lubbock PCMCIA specific routines.
 *
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/delay.h>

#include <asm/hardware.h>
#include <asm/hardware/sa1111.h>
#include <asm/mach-types.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/lubbock.h>

#include "sa1111_generic.h"

static int
lubbock_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
	/*
	 * Setup default state of GPIO outputs
	 * before we enable them as outputs.
	 */
	GPSR(GPIO48_nPOE) =
		GPIO_bit(GPIO48_nPOE) |
		GPIO_bit(GPIO49_nPWE) |
		GPIO_bit(GPIO50_nPIOR) |
		GPIO_bit(GPIO51_nPIOW) |
		GPIO_bit(GPIO52_nPCE_1) |
		GPIO_bit(GPIO53_nPCE_2);

	pxa_gpio_mode(GPIO48_nPOE_MD);
	pxa_gpio_mode(GPIO49_nPWE_MD);
	pxa_gpio_mode(GPIO50_nPIOR_MD);
	pxa_gpio_mode(GPIO51_nPIOW_MD);
	pxa_gpio_mode(GPIO52_nPCE_1_MD);
	pxa_gpio_mode(GPIO53_nPCE_2_MD);
	pxa_gpio_mode(GPIO54_pSKTSEL_MD);
	pxa_gpio_mode(GPIO55_nPREG_MD);
	pxa_gpio_mode(GPIO56_nPWAIT_MD);
	pxa_gpio_mode(GPIO57_nIOIS16_MD);

	return sa1111_pcmcia_hw_init(skt);
}

static int
lubbock_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
				const socket_state_t *state)
{
	unsigned int pa_dwr_mask, pa_dwr_set, misc_mask, misc_set;
	int ret = 0;

	pa_dwr_mask = pa_dwr_set = misc_mask = misc_set = 0;

	/* Lubbock uses the Maxim MAX1602, with the following connections:
	 *
	 * Socket 0 (PCMCIA):
	 *	MAX1602	Lubbock		Register
	 *	Pin	Signal
	 *	-----	-------		----------------------
	 *	A0VPP	S0_PWR0		SA-1111 GPIO A<0>
	 *	A1VPP	S0_PWR1		SA-1111 GPIO A<1>
	 *	A0VCC	S0_PWR2		SA-1111 GPIO A<2>
	 *	A1VCC	S0_PWR3		SA-1111 GPIO A<3>
	 *	VX	VCC
	 *	VY	+3.3V
	 *	12IN	+12V
	 *	CODE	+3.3V		Cirrus  Code, CODE = High (VY)
	 *
	 * Socket 1 (CF):
	 *	MAX1602	Lubbock		Register
	 *	Pin	Signal
	 *	-----	-------		----------------------
	 *	A0VPP	GND		VPP is not connected
	 *	A1VPP	GND		VPP is not connected
	 *	A0VCC	S1_PWR0		MISC_WR<14>
	 *	A1VCC	S1_PWR1		MISC_WR<15>
	 *	VX	VCC
	 *	VY	+3.3V
	 *	12IN	GND		VPP is not connected
	 *	CODE	+3.3V		Cirrus  Code, CODE = High (VY)
	 *
	 */

 again:
	switch (skt->nr) {
	case 0:
		pa_dwr_mask = GPIO_A0 | GPIO_A1 | GPIO_A2 | GPIO_A3;

		switch (state->Vcc) {
		case 0: /* Hi-Z */
			break;

		case 33: /* VY */
			pa_dwr_set |= GPIO_A3;
			break;

		case 50: /* VX */
			pa_dwr_set |= GPIO_A2;
			break;

		default:
			printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
			       __FUNCTION__, state->Vcc);
			ret = -1;
		}

		switch (state->Vpp) {
		case 0: /* Hi-Z */
			break;

		case 120: /* 12IN */
			pa_dwr_set |= GPIO_A1;
			break;

		default: /* VCC */
			if (state->Vpp == state->Vcc)
				pa_dwr_set |= GPIO_A0;
			else {
				printk(KERN_ERR "%s(): unrecognized Vpp %u\n",
				       __FUNCTION__, state->Vpp);
				ret = -1;
				break;
			}
		}
		break;

	case 1:
		misc_mask = (1 << 15) | (1 << 14);

		switch (state->Vcc) {
		case 0: /* Hi-Z */
			break;

		case 33: /* VY */
			misc_set |= 1 << 15;
			break;

		case 50: /* VX */
			misc_set |= 1 << 14;
			break;

		default:
			printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
			       __FUNCTION__, state->Vcc);
			ret = -1;
			break;
		}

		if (state->Vpp != state->Vcc && state->Vpp != 0) {
			printk(KERN_ERR "%s(): CF slot cannot support Vpp %u\n",
			       __FUNCTION__, state->Vpp);
			ret = -1;
			break;
		}
		break;

	default:
		ret = -1;
	}

	if (ret == 0)
		ret = sa1111_pcmcia_configure_socket(skt, state);

	if (ret == 0) {
		lubbock_set_misc_wr(misc_mask, misc_set);
		sa1111_set_io(SA1111_DEV(skt->dev), pa_dwr_mask, pa_dwr_set);
	}

#if 1
	if (ret == 0 && state->Vcc == 33) {
		struct pcmcia_state new_state;

		/*
		 * HACK ALERT:
		 * We can't sense the voltage properly on Lubbock before
		 * actually applying some power to the socket (catch 22).
		 * Resense the socket Voltage Sense pins after applying
		 * socket power.
		 *
		 * Note: It takes about 2.5ms for the MAX1602 VCC output
		 * to rise.
		 */
		mdelay(3);

		sa1111_pcmcia_socket_state(skt, &new_state);

		if (!new_state.vs_3v && !new_state.vs_Xv) {
			/*
			 * Switch to 5V,  Configure socket with 5V voltage
			 */
			lubbock_set_misc_wr(misc_mask, 0);
			sa1111_set_io(SA1111_DEV(skt->dev), pa_dwr_mask, 0);

			/*
			 * It takes about 100ms to turn off Vcc.
			 */
			mdelay(100);

			/*
			 * We need to hack around the const qualifier as
			 * well to keep this ugly workaround localized and
			 * not force it to the rest of the code. Barf bags
			 * avaliable in the seat pocket in front of you!
			 */
			((socket_state_t *)state)->Vcc = 50;
			((socket_state_t *)state)->Vpp = 50;
			goto again;
		}
	}
#endif

	return ret;
}

static struct pcmcia_low_level lubbock_pcmcia_ops = {
	.owner			= THIS_MODULE,
	.hw_init		= lubbock_pcmcia_hw_init,
	.hw_shutdown		= sa1111_pcmcia_hw_shutdown,
	.socket_state		= sa1111_pcmcia_socket_state,
	.configure_socket	= lubbock_pcmcia_configure_socket,
	.socket_init		= sa1111_pcmcia_socket_init,
	.socket_suspend		= sa1111_pcmcia_socket_suspend,
	.first			= 0,
	.nr			= 2,
};

#include "pxa2xx_base.h"

int __init pcmcia_lubbock_init(struct sa1111_dev *sadev)
{
	int ret = -ENODEV;

	if (machine_is_lubbock()) {
		/*
		 * Set GPIO_A<3:0> to be outputs for the MAX1600,
		 * and switch to standby mode.
		 */
		sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
		sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
		sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);

		/* Set CF Socket 1 power to standby mode. */
		lubbock_set_misc_wr((1 << 15) | (1 << 14), 0);

		sadev->dev.platform_data = &lubbock_pcmcia_ops;
		ret = pxa2xx_drv_pcmcia_probe(&sadev->dev);
	}

	return ret;
}