/*
* (c) 2010 STMicroelectronics Limited
*
* Author: Pawel Moll <pawel.moll@st.com>
*
* 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/init.h>
#include <linux/platform_device.h>
#include <linux/stm/pad.h>
#include <linux/stm/sysconf.h>
#include <linux/stm/emi.h>
#include <linux/stm/stx7105.h>
#include <asm/irq-ilc.h>
/* PCI Resources ---------------------------------------------------------- */
/* This function assumes you are using the dedicated pins. Production boards
* will more likely use the external interrupt pins and save the PIOs */
int stx7111_pcibios_map_platform_irq(struct stm_plat_pci_config *pci_config,
u8 pin)
{
int irq;
int pin_type;
if ((pin > 4) || (pin < 1))
return -1;
pin_type = pci_config->pci_irq[pin - 1];
switch(pin_type) {
case PCI_PIN_DEFAULT:
irq = evt2irq(0xa00 + ((pin - 1) * 0x20));
break;
case PCI_PIN_ALTERNATIVE:
/* There is no alternative here ;-) */
BUG();
irq = -1;
break;
case PCI_PIN_UNUSED:
irq = -1; /* Not used */
break;
default:
/* Take whatever interrupt you are told */
irq = pin_type;
break;
}
return irq;
}
static struct platform_device stx7111_pci_device = {
.name = "pci_stm",
.id = -1,
.num_resources = 7,
.resource = (struct resource[]) {
#ifdef CONFIG_32BIT
/* 512 MB */
STM_PLAT_RESOURCE_MEM_NAMED("pci memory",
0xc0000000, 0x20000000),
#else
/* 64 MB */
STM_PLAT_RESOURCE_MEM_NAMED("pci memory",
0x08000000, 0x04000000),
#endif
{
.name = "pci io",
.start = 0x0400,
.end = 0xffff,
.flags = IORESOURCE_IO,
},
STM_PLAT_RESOURCE_MEM_NAMED("pci emiss", 0xfe400000, 0x17fc),
STM_PLAT_RESOURCE_MEM_NAMED("pci ahb", 0xfe560000, 0xff),
STM_PLAT_RESOURCE_IRQ_NAMED("pci dma", evt2irq(0x1280), -1),
STM_PLAT_RESOURCE_IRQ_NAMED("pci err", evt2irq(0x1200), -1),
/* SERR interrupt set in stx7111_configure_pci() */
STM_PLAT_RESOURCE_IRQ_NAMED("pci serr", -1, -1),
},
};
#define STX7111_PIO_PCI_REQ(i) stm_gpio(0, ((3 - i) * 2) + 2)
#define STX7111_PIO_PCI_GNT(i) stm_gpio(2, (3 - i) + 5)
#define STX7111_PIO_PCI_INT(i) stm_gpio(3, i == 0 ? 7 : 3 - i)
#define STX7111_PIO_PCI_SERR stm_gpio(5, 5)
void __init stx7111_configure_pci(struct stm_plat_pci_config *pci_conf)
{
int i;
struct sysconf_field *sc;
/* LLA clocks have these horrible names... */
pci_conf->clk_name = "CLKA_PCI";
/* Fill in the default values for the 7111 */
if(!pci_conf->ad_override_default) {
pci_conf->ad_threshold = 5;
pci_conf->ad_read_ahead = 1;
pci_conf->ad_chunks_in_msg = 0;
pci_conf->ad_pcks_in_chunk = 0;
pci_conf->ad_trigger_mode = 1;
pci_conf->ad_max_opcode = 5;
pci_conf->ad_posted = 1;
}
/* Copy over platform specific data to driver */
stx7111_pci_device.dev.platform_data = pci_conf;
#if defined(CONFIG_PM)
#warning TODO: PCI Power Management
#endif
/* Claim and power up the PCI cell */
sc = sysconf_claim(SYS_CFG, 32, 2, 2, "PCI Power");
sysconf_write(sc, 0);
sc = sysconf_claim(SYS_STA, 15, 2, 2, "PCI Power status");
while (sysconf_read(sc))
cpu_relax(); /* Loop until powered up */
/* Claim and set pads into PCI mode */
sc = sysconf_claim(SYS_CFG, 31, 20, 20, "PCI");
sysconf_write(sc, 1);
/* Configure the REQ/GNT[1..3], muxed with PIOs */
for (i = 1; i < 4; i++) {
static const char *req_name[] = {
"PCI REQ 0",
"PCI REQ 1",
"PCI REQ 2",
"PCI REQ 3"
};
static const char *gnt_name[] = {
"PCI GNT 0",
"PCI GNT 1",
"PCI GNT 2",
"PCI GNT 3"
};
switch (pci_conf->req_gnt[i]) {
case PCI_PIN_DEFAULT:
if (gpio_request(STX7111_PIO_PCI_REQ(i),
req_name[i]) == 0)
stm_gpio_direction(STX7111_PIO_PCI_REQ(i),
STM_GPIO_DIRECTION_IN);
else
printk(KERN_ERR "Unable to configure PIO for "
"%s\n", req_name[i]);
if (gpio_request(STX7111_PIO_PCI_GNT(i),
gnt_name[i]) == 0)
stm_gpio_direction(STX7111_PIO_PCI_GNT(i),
STM_GPIO_DIRECTION_ALT_OUT);
else
printk(KERN_ERR "Unable to configure PIO for "
"%s\n", gnt_name[i]);
sc = sysconf_claim(SYS_CFG, 5, (3 - i) + 2,
(3 - i) + 2, req_name[i]);
sysconf_write(sc, 1);
break;
case PCI_PIN_UNUSED:
/* Unused is unused - nothing to do */
break;
default:
/* No alternative here... */
BUG();
break;
}
}
/* Configure interrupt PIOs */
for (i = 0; i < 4; i++) {
static const char *int_name[] = {
"PCI INT A",
"PCI INT B",
"PCI INT C",
"PCI INT D"
};
switch (pci_conf->pci_irq[i]) {
case PCI_PIN_ALTERNATIVE:
/* No alternative here... */
BUG();
break;
case PCI_PIN_DEFAULT:
if (gpio_request(STX7111_PIO_PCI_INT(i),
int_name[i]) != 0) {
printk(KERN_ERR "Unable to claim PIO for "
"%s\n", int_name[i]);
break;
}
stm_gpio_direction(STX7111_PIO_PCI_INT(i),
STM_GPIO_DIRECTION_IN);
/* Set the alternate function correctly in sysconfig */
sc = sysconf_claim(SYS_CFG, 5, 9 + i, 9 + i,
int_name[i]);
sysconf_write(sc, 1);
break;
default:
/* Unused or interrupt number passed, nothing to do */
break;
}
}
/* Configure the SERR interrupt (if wired up) */
switch (pci_conf->serr_irq) {
case PCI_PIN_DEFAULT:
if (gpio_request(STX7111_PIO_PCI_SERR, "PCI_SERR#") == 0) {
stm_gpio_direction(STX7111_PIO_PCI_SERR,
STM_GPIO_DIRECTION_IN);
pci_conf->serr_irq = gpio_to_irq(STX7111_PIO_PCI_SERR);
set_irq_type(pci_conf->serr_irq, IRQ_TYPE_LEVEL_LOW);
} else {
printk(KERN_WARNING "%s(): Failed to claim PCI SERR# "
"PIO!\n", __func__);
pci_conf->serr_irq = PCI_PIN_UNUSED;
}
break;
case PCI_PIN_ALTERNATIVE:
/* No alternative here */
BUG();
pci_conf->serr_irq = PCI_PIN_UNUSED;
break;
}
if (pci_conf->serr_irq != PCI_PIN_UNUSED) {
struct resource *res = platform_get_resource_byname(
&stx7111_pci_device, IORESOURCE_IRQ,
"pci serr");
BUG_ON(!res);
res->start = pci_conf->serr_irq;
res->end = pci_conf->serr_irq;
}
stx7111_pci_device.dev.parent =
bus_find_device_by_name(&platform_bus_type, NULL, "emi");
platform_device_register(&stx7111_pci_device);
}