[ARM PATCH] 2392/1: Add PCMCIA/CF support code for Sharp SL-C7xx Series

Patch from Richard Purdie

Add support code to enable the Compact Flash socket on the Sharp
SL-C7xx series of PDAs. The socket is controlled via the Sharp
SCOOP interface.

Signed-off-by: Richard Purdie
Signed-off-by: Russell King

drivers/pcmcia/Makefile

@@ -48,4 +48,5 @@ sa1100_cs-$(CONFIG_SA1100_SIMPAD)		+= sa1100_simpad.o
 
 pxa2xx_cs-$(CONFIG_ARCH_LUBBOCK)		+= pxa2xx_lubbock.o sa1111_generic.o
 pxa2xx_cs-$(CONFIG_MACH_MAINSTONE)		+= pxa2xx_mainstone.o
+pxa2xx_cs-$(CONFIG_PXA_SHARPSL)			+= pxa2xx_sharpsl.o
 

drivers/pcmcia/pxa2xx_sharpsl.c

+/*
+ * Sharp SL-C7xx Series PCMCIA routines
+ *
+ * Copyright (c) 2004-2005 Richard Purdie
+ *
+ * Based on Sharp's 2.4 kernel patches and pxa2xx_mainstone.c
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+
+#include <asm/hardware/scoop.h>
+#include <asm/arch/corgi.h>
+#include <asm/arch/pxa-regs.h>
+
+#include "soc_common.h"
+
+#define	NO_KEEP_VS 0x0001
+
+static unsigned char keep_vs;
+static unsigned char keep_rd;
+
+static struct pcmcia_irqs irqs[] = {
+	{ 0, CORGI_IRQ_GPIO_CF_CD, "PCMCIA0 CD"},
+};
+
+static void sharpsl_pcmcia_init_reset(void)
+{
+	reset_scoop();
+	keep_vs = NO_KEEP_VS;
+	keep_rd = 0;
+}
+
+static int sharpsl_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
+{
+	int ret;
+
+	/*
+	 * 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);
+
+	/* Register interrupts */
+	ret = soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
+
+	if (ret) {
+		printk(KERN_ERR "Request for Compact Flash IRQ failed\n");
+		return ret;
+	}
+
+	/* Enable interrupt */
+	write_scoop_reg(SCOOP_IMR, 0x00C0);
+	write_scoop_reg(SCOOP_MCR, 0x0101);
+	keep_vs = NO_KEEP_VS;
+
+	skt->irq = CORGI_IRQ_GPIO_CF_IRQ;
+
+	return 0;
+}
+
+static void sharpsl_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
+{
+	soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
+
+	/* CF_BUS_OFF */
+	sharpsl_pcmcia_init_reset();
+}
+
+
+static void sharpsl_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
+				    struct pcmcia_state *state)
+{
+	unsigned short cpr, csr;
+
+	cpr = read_scoop_reg(SCOOP_CPR);
+
+	write_scoop_reg(SCOOP_IRM, 0x00FF);
+	write_scoop_reg(SCOOP_ISR, 0x0000);
+	write_scoop_reg(SCOOP_IRM, 0x0000);
+	csr = read_scoop_reg(SCOOP_CSR);
+	if (csr & 0x0004) {
+		/* card eject */
+		write_scoop_reg(SCOOP_CDR, 0x0000);
+		keep_vs = NO_KEEP_VS;
+	}
+	else if (!(keep_vs & NO_KEEP_VS)) {
+		/* keep vs1,vs2 */
+		write_scoop_reg(SCOOP_CDR, 0x0000);
+		csr |= keep_vs;
+	}
+	else if (cpr & 0x0003) {
+		/* power on */
+		write_scoop_reg(SCOOP_CDR, 0x0000);
+		keep_vs = (csr & 0x00C0);
+	}
+	else {
+		/* card detect */
+		write_scoop_reg(SCOOP_CDR, 0x0002);
+	}
+
+	state->detect = (csr & 0x0004) ? 0 : 1;
+	state->ready  = (csr & 0x0002) ? 1 : 0;
+	state->bvd1   = (csr & 0x0010) ? 1 : 0;
+	state->bvd2   = (csr & 0x0020) ? 1 : 0;
+	state->wrprot = (csr & 0x0008) ? 1 : 0;
+	state->vs_3v  = (csr & 0x0040) ? 0 : 1;
+	state->vs_Xv  = (csr & 0x0080) ? 0 : 1;
+
+	if ((cpr & 0x0080) && ((cpr & 0x8040) != 0x8040)) {
+		printk(KERN_ERR "sharpsl_pcmcia_socket_state(): CPR=%04X, Low voltage!\n", cpr);
+	}
+
+}
+
+
+static int sharpsl_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
+				       const socket_state_t *state)
+{
+	unsigned long flags;
+
+	unsigned short cpr, ncpr, ccr, nccr, mcr, nmcr, imr, nimr;
+
+	switch (state->Vcc) {
+	case	0:  	break;
+	case 	33: 	break;
+	case	50: 	break;
+	default:
+		 printk(KERN_ERR "sharpsl_pcmcia_configure_socket(): bad Vcc %u\n", state->Vcc);
+		 return -1;
+	}
+
+	if ((state->Vpp!=state->Vcc) && (state->Vpp!=0)) {
+		printk(KERN_ERR "CF slot cannot support Vpp %u\n", state->Vpp);
+		return -1;
+	}
+
+	local_irq_save(flags);
+
+	nmcr = (mcr = read_scoop_reg(SCOOP_MCR)) & ~0x0010;
+	ncpr = (cpr = read_scoop_reg(SCOOP_CPR)) & ~0x0083;
+	nccr = (ccr = read_scoop_reg(SCOOP_CCR)) & ~0x0080;
+	nimr = (imr = read_scoop_reg(SCOOP_IMR)) & ~0x003E;
+
+	ncpr |= (state->Vcc == 33) ? 0x0001 :
+				(state->Vcc == 50) ? 0x0002 : 0;
+	nmcr |= (state->flags&SS_IOCARD) ? 0x0010 : 0;
+	ncpr |= (state->flags&SS_OUTPUT_ENA) ? 0x0080 : 0;
+	nccr |= (state->flags&SS_RESET)? 0x0080: 0;
+	nimr |=	((skt->status&SS_DETECT) ? 0x0004 : 0)|
+			((skt->status&SS_READY)  ? 0x0002 : 0)|
+			((skt->status&SS_BATDEAD)? 0x0010 : 0)|
+			((skt->status&SS_BATWARN)? 0x0020 : 0)|
+			((skt->status&SS_STSCHG) ? 0x0010 : 0)|
+			((skt->status&SS_WRPROT) ? 0x0008 : 0);
+
+	if (!(ncpr & 0x0003)) {
+		keep_rd = 0;
+	} else if (!keep_rd) {
+		if (nccr & 0x0080)
+			keep_rd = 1;
+		else
+			nccr |= 0x0080;
+	}
+
+	if (mcr != nmcr)
+		write_scoop_reg(SCOOP_MCR, nmcr);
+	if (cpr != ncpr)
+		write_scoop_reg(SCOOP_CPR, ncpr);
+	if (ccr != nccr)
+		write_scoop_reg(SCOOP_CCR, nccr);
+	if (imr != nimr)
+		write_scoop_reg(SCOOP_IMR, nimr);
+
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+static void sharpsl_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
+{
+}
+
+static void sharpsl_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
+{
+}
+
+static struct pcmcia_low_level sharpsl_pcmcia_ops = {
+	.owner				= THIS_MODULE,
+	.hw_init			= sharpsl_pcmcia_hw_init,
+	.hw_shutdown		= sharpsl_pcmcia_hw_shutdown,
+	.socket_state		= sharpsl_pcmcia_socket_state,
+	.configure_socket	= sharpsl_pcmcia_configure_socket,
+	.socket_init		= sharpsl_pcmcia_socket_init,
+	.socket_suspend		= sharpsl_pcmcia_socket_suspend,
+	.first				= 0,
+	.nr					= 1,
+};
+
+static struct platform_device *sharpsl_pcmcia_device;
+
+static int __init sharpsl_pcmcia_init(void)
+{
+	int ret;
+
+	sharpsl_pcmcia_device = kmalloc(sizeof(*sharpsl_pcmcia_device), GFP_KERNEL);
+	if (!sharpsl_pcmcia_device)
+		return -ENOMEM;
+	memset(sharpsl_pcmcia_device, 0, sizeof(*sharpsl_pcmcia_device));
+	sharpsl_pcmcia_device->name = "pxa2xx-pcmcia";
+	sharpsl_pcmcia_device->dev.platform_data = &sharpsl_pcmcia_ops;
+
+	ret = platform_device_register(sharpsl_pcmcia_device);
+	if (ret)
+		kfree(sharpsl_pcmcia_device);
+
+	return ret;
+}
+
+static void __exit sharpsl_pcmcia_exit(void)
+{
+	/*
+	 * This call is supposed to free our sharpsl_pcmcia_device.
+	 * Unfortunately platform_device don't have a free method, and
+	 * we can't assume it's free of any reference at this point so we
+	 * can't free it either.
+	 */
+	platform_device_unregister(sharpsl_pcmcia_device);
+}
+
+module_init(sharpsl_pcmcia_init);
+module_exit(sharpsl_pcmcia_exit);
+
+MODULE_DESCRIPTION("Sharp SL Series PCMCIA Support");
+MODULE_LICENSE("GPL");