/*
* (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 ---------------------------------------------------------- */
/* You may pass one of the PCI_PIN_* constants to use dedicated pin or
* just pass interrupt number generated with gpio_to_irq() when PIO pads
* are used as interrupts or IRLx_IRQ when using external interrupts inputs */
int stx7105_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_ALTERNATIVE:
/* There is an alternative for the INTA only! */
if (pin != 1) {
BUG();
irq = -1;
break;
}
/* Fall through */
case PCI_PIN_DEFAULT:
/* There are only 3 dedicated interrupt lines! */
if (pin == 4) {
BUG();
irq = -1;
break;
}
irq = ILC_EXT_IRQ(pin + 25);
break;
case PCI_PIN_UNUSED:
irq = -1; /* Not used */
break;
default:
irq = pin_type; /* Take whatever interrupt you are told */
break;
}
return irq;
}
static struct platform_device stx7105_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", ILC_EXT_IRQ(25), -1),
/* SERR interrupt set in stx7105_configure_pci() */
STM_PLAT_RESOURCE_IRQ_NAMED("pci serr", -1, -1),
},
};
static struct stm_pad_config pci_reqgnt_config[] = {
/* REQ0/GNT0 have dedicated pins... */
[1] = {
.gpios_num = 2,
.gpios = (struct stm_pad_gpio []) {
STM_PAD_PIO_IN(6, 5, -1), /* REQ1 */
STM_PAD_PIO_OUT(7, 1, 4), /* GNT1 */
},
},
[2] = {
.gpios_num = 2,
.gpios = (struct stm_pad_gpio []) {
STM_PAD_PIO_IN(6, 6, -1), /* REQ2 */
STM_PAD_PIO_OUT(7, 2, 4), /* GNT2 */
},
},
[3] = {
.gpios_num = 2,
.gpios = (struct stm_pad_gpio []) {
STM_PAD_PIO_IN(6, 7, -1), /* REQ3 */
STM_PAD_PIO_OUT(7, 3, 4), /* GNT3 */
},
},
};
static struct stm_pad_config pci_int_config[] = {
[0] = {
.gpios_num = 1,
.gpios = (struct stm_pad_gpio []) {
STM_PAD_PIO_IN(6, 0, -1), /* INTA */
},
},
[1] = {
.gpios_num = 1,
.gpios = (struct stm_pad_gpio []) {
STM_PAD_PIO_IN(6, 1, -1), /* INTB */
},
},
[2] = {
.gpios_num = 1,
.gpios = (struct stm_pad_gpio []) {
STM_PAD_PIO_IN(6, 2, -1), /* INTC */
},
},
[3] = {
.gpios_num = 1,
.gpios = (struct stm_pad_gpio []) {
STM_PAD_PIO_IN(6, 3, -1), /* INTD */
},
},
};
#define STX7105_PIO_PCI_INTA_ALT stm_gpio(15, 3)
#define STX7105_PIO_PCI_SERR stm_gpio(15, 4)
void __init stx7105_configure_pci(struct stm_plat_pci_config *pci_conf)
{
struct sysconf_field *sc;
int i;
/* LLA clocks have these horrible names... */
pci_conf->clk_name = "CLKA_PCI";
/* 7105 cut 3 has req0 wired to req3 to work around NAND problems;
* the same story for 7106 */
pci_conf->req0_to_req3 = (cpu_data->type == CPU_STX7106) ||
(cpu_data->cut_major >= 3);
/* Fill in the default values for the 7105 */
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 */
stx7105_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); /* We will need to stash this somewhere
for power management. */
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);
/* PCI_CLOCK_MASTER_NOT_SLAVE:
* 0: PCI clock is slave
* 1: PCI clock is master */
sc = sysconf_claim(SYS_CFG, 5, 28, 28, "PCI");
sysconf_write(sc, 1);
/* Configure the REQ/GNT[1..3], muxed with PIOs */
for (i = 1; i < 4; i++) {
switch (pci_conf->req_gnt[i]) {
case PCI_PIN_DEFAULT:
/* REQ/GNT3 only exist pre cut 3 */
BUG_ON(pci_conf->req0_to_req3 && i == 3);
if (!stm_pad_claim(pci_reqgnt_config + i, "PCI")) {
printk(KERN_ERR "Cannot claim REQ/GNT"
"%d pads\n", i);
BUG();
}
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 < 3; i++) {
switch (pci_conf->pci_irq[i]) {
case PCI_PIN_ALTERNATIVE:
if (i != 0)
BUG();
if (gpio_request(STX7105_PIO_PCI_INTA_ALT,
"PCI INTA") != 0) {
printk(KERN_ERR "Unable to claim PIO for"
"PCI INTA");
BUG();
}
set_irq_type(ILC_EXT_IRQ(26), IRQ_TYPE_LEVEL_LOW);
stm_gpio_direction(STX7105_PIO_PCI_INTA_ALT,
STM_GPIO_DIRECTION_IN);
/* PCI_INT0_SRC_SEL:
* 0: PCI_INT_FROM_DEVICE[0] is from PIO6[0]
* 1: PCI_INT_FROM_DEVICE[0] is from PIO15[3] */
sc = sysconf_claim(SYS_CFG, 5, 27, 27, "PCI");
sysconf_write(sc, 1);
/* PCI_INT0_FROM_DEVICE:
* 0: Indicates disabled
* 1: Indicates PCI_INT_FROM_DEVICE[0] is enabled */
sc = sysconf_claim(SYS_CFG, 5, 21, 21, "PCI");
sysconf_write(sc, 1);
break;
case PCI_PIN_DEFAULT:
if (!stm_pad_claim(pci_int_config + i, "PCI")) {
printk(KERN_ERR "Failed to claim INT"
"%c pad!\n", 'A' + i);
BUG();
}
set_irq_type(ILC_EXT_IRQ(26 + i), IRQ_TYPE_LEVEL_LOW);
if (i == 0) {
/* PCI_INT0_SRC_SEL:
* 0: PCI_INT_FROM_DEVICE[0] is from PIO6[0]
* 1: PCI_INT_FROM_DEVICE[0] is from PIO15[3] */
sc = sysconf_claim(SYS_CFG, 5, 27, 27, "PCI");
sysconf_write(sc, 0);
}
/* PCI_INTn_FROM_DEVICE:
* 0: Indicates disabled
* 1: Indicates PCI_INT_FROM_DEVICE[n] is enabled */
sc = sysconf_claim(SYS_CFG, 5, 21 - i, 21 - i, "PCI");
sysconf_write(sc, 1);
break;
default:
/* Unused or interrupt number passed, nothing to do */
break;
}
}
BUG_ON(pci_conf->pci_irq[3] != PCI_PIN_UNUSED);
/* Configure the SERR interrupt (if wired up) */
switch (pci_conf->serr_irq) {
case PCI_PIN_DEFAULT:
if (gpio_request(STX7105_PIO_PCI_SERR, "PCI_SERR#") == 0) {
stm_gpio_direction(STX7105_PIO_PCI_SERR,
STM_GPIO_DIRECTION_IN);
pci_conf->serr_irq = gpio_to_irq(STX7105_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;
res = platform_get_resource_byname(&stx7105_pci_device,
IORESOURCE_IRQ, "pci serr");
BUG_ON(!res);
res->start = pci_conf->serr_irq;
res->end = pci_conf->serr_irq;
}
/* LOCK is not claimed as is totally pointless, the SOCs do not
* support any form of coherency */
stx7105_pci_device.dev.parent =
bus_find_device_by_name(&platform_bus_type, NULL, "emi");
platform_device_register(&stx7105_pci_device);
}