318 lines
8.0 KiB
C
318 lines
8.0 KiB
C
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/*
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* (c) 2010 STMicroelectronics Limited
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*
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* Author: Pawel Moll <pawel.moll@st.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/stm/pad.h>
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#include <linux/stm/sysconf.h>
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#include <linux/stm/emi.h>
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#include <linux/stm/stx7105.h>
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#include <asm/irq-ilc.h>
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/* PCI Resources ---------------------------------------------------------- */
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/* You may pass one of the PCI_PIN_* constants to use dedicated pin or
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* just pass interrupt number generated with gpio_to_irq() when PIO pads
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* are used as interrupts or IRLx_IRQ when using external interrupts inputs */
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int stx7105_pcibios_map_platform_irq(struct stm_plat_pci_config *pci_config,
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u8 pin)
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{
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int irq;
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int pin_type;
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if ((pin > 4) || (pin < 1))
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return -1;
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pin_type = pci_config->pci_irq[pin - 1];
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switch (pin_type) {
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case PCI_PIN_ALTERNATIVE:
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/* There is an alternative for the INTA only! */
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if (pin != 1) {
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BUG();
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irq = -1;
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break;
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}
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/* Fall through */
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case PCI_PIN_DEFAULT:
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/* There are only 3 dedicated interrupt lines! */
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if (pin == 4) {
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BUG();
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irq = -1;
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break;
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}
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irq = ILC_EXT_IRQ(pin + 25);
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break;
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case PCI_PIN_UNUSED:
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irq = -1; /* Not used */
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break;
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default:
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irq = pin_type; /* Take whatever interrupt you are told */
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break;
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}
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return irq;
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}
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static struct platform_device stx7105_pci_device = {
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.name = "pci_stm",
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.id = -1,
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.num_resources = 7,
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.resource = (struct resource[]) {
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#ifdef CONFIG_32BIT
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/* 512 MB */
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STM_PLAT_RESOURCE_MEM_NAMED("pci memory",
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0xc0000000, 0x20000000),
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#else
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/* 64 MB */
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STM_PLAT_RESOURCE_MEM_NAMED("pci memory",
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0x08000000, 0x04000000),
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#endif
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{
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.name = "pci io",
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.start = 0x0400,
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.end = 0xffff,
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.flags = IORESOURCE_IO,
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},
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STM_PLAT_RESOURCE_MEM_NAMED("pci emiss", 0xfe400000, 0x17fc),
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STM_PLAT_RESOURCE_MEM_NAMED("pci ahb", 0xfe560000, 0xff),
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STM_PLAT_RESOURCE_IRQ_NAMED("pci dma", evt2irq(0x1280), -1),
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STM_PLAT_RESOURCE_IRQ_NAMED("pci err", ILC_EXT_IRQ(25), -1),
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/* SERR interrupt set in stx7105_configure_pci() */
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STM_PLAT_RESOURCE_IRQ_NAMED("pci serr", -1, -1),
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},
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};
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static struct stm_pad_config pci_reqgnt_config[] = {
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/* REQ0/GNT0 have dedicated pins... */
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[1] = {
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.gpios_num = 2,
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.gpios = (struct stm_pad_gpio []) {
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STM_PAD_PIO_IN(6, 5, -1), /* REQ1 */
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STM_PAD_PIO_OUT(7, 1, 4), /* GNT1 */
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},
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},
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[2] = {
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.gpios_num = 2,
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.gpios = (struct stm_pad_gpio []) {
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STM_PAD_PIO_IN(6, 6, -1), /* REQ2 */
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STM_PAD_PIO_OUT(7, 2, 4), /* GNT2 */
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},
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},
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[3] = {
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.gpios_num = 2,
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.gpios = (struct stm_pad_gpio []) {
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STM_PAD_PIO_IN(6, 7, -1), /* REQ3 */
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STM_PAD_PIO_OUT(7, 3, 4), /* GNT3 */
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},
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},
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};
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static struct stm_pad_config pci_int_config[] = {
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[0] = {
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.gpios_num = 1,
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.gpios = (struct stm_pad_gpio []) {
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STM_PAD_PIO_IN(6, 0, -1), /* INTA */
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},
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},
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[1] = {
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.gpios_num = 1,
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.gpios = (struct stm_pad_gpio []) {
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STM_PAD_PIO_IN(6, 1, -1), /* INTB */
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},
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},
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[2] = {
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.gpios_num = 1,
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.gpios = (struct stm_pad_gpio []) {
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STM_PAD_PIO_IN(6, 2, -1), /* INTC */
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},
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},
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[3] = {
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.gpios_num = 1,
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.gpios = (struct stm_pad_gpio []) {
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STM_PAD_PIO_IN(6, 3, -1), /* INTD */
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},
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},
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};
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#define STX7105_PIO_PCI_INTA_ALT stm_gpio(15, 3)
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#define STX7105_PIO_PCI_SERR stm_gpio(15, 4)
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void __init stx7105_configure_pci(struct stm_plat_pci_config *pci_conf)
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{
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struct sysconf_field *sc;
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int i;
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/* LLA clocks have these horrible names... */
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pci_conf->clk_name = "CLKA_PCI";
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/* 7105 cut 3 has req0 wired to req3 to work around NAND problems;
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* the same story for 7106 */
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pci_conf->req0_to_req3 = (cpu_data->type == CPU_STX7106) ||
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(cpu_data->cut_major >= 3);
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/* Fill in the default values for the 7105 */
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if (!pci_conf->ad_override_default) {
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pci_conf->ad_threshold = 5;
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pci_conf->ad_read_ahead = 1;
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pci_conf->ad_chunks_in_msg = 0;
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pci_conf->ad_pcks_in_chunk = 0;
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pci_conf->ad_trigger_mode = 1;
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pci_conf->ad_max_opcode = 5;
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pci_conf->ad_posted = 1;
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}
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/* Copy over platform specific data to driver */
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stx7105_pci_device.dev.platform_data = pci_conf;
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#if defined(CONFIG_PM)
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#warning TODO: PCI Power Management
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#endif
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/* Claim and power up the PCI cell */
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sc = sysconf_claim(SYS_CFG, 32, 2, 2, "PCI Power");
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sysconf_write(sc, 0); /* We will need to stash this somewhere
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for power management. */
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sc = sysconf_claim(SYS_STA, 15, 2, 2, "PCI Power status");
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while (sysconf_read(sc))
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cpu_relax(); /* Loop until powered up */
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/* Claim and set pads into PCI mode */
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sc = sysconf_claim(SYS_CFG, 31, 20, 20, "PCI");
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sysconf_write(sc, 1);
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/* PCI_CLOCK_MASTER_NOT_SLAVE:
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* 0: PCI clock is slave
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* 1: PCI clock is master */
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sc = sysconf_claim(SYS_CFG, 5, 28, 28, "PCI");
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sysconf_write(sc, 1);
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/* Configure the REQ/GNT[1..3], muxed with PIOs */
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for (i = 1; i < 4; i++) {
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switch (pci_conf->req_gnt[i]) {
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case PCI_PIN_DEFAULT:
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/* REQ/GNT3 only exist pre cut 3 */
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BUG_ON(pci_conf->req0_to_req3 && i == 3);
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if (!stm_pad_claim(pci_reqgnt_config + i, "PCI")) {
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printk(KERN_ERR "Cannot claim REQ/GNT"
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"%d pads\n", i);
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BUG();
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}
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break;
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case PCI_PIN_UNUSED:
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/* Unused is unused - nothing to do */
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break;
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default:
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/* No alternative here... */
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BUG();
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break;
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}
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}
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/* Configure interrupt PIOs */
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for (i = 0; i < 3; i++) {
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switch (pci_conf->pci_irq[i]) {
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case PCI_PIN_ALTERNATIVE:
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if (i != 0)
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BUG();
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if (gpio_request(STX7105_PIO_PCI_INTA_ALT,
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"PCI INTA") != 0) {
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printk(KERN_ERR "Unable to claim PIO for"
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"PCI INTA");
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BUG();
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}
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set_irq_type(ILC_EXT_IRQ(26), IRQ_TYPE_LEVEL_LOW);
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stm_gpio_direction(STX7105_PIO_PCI_INTA_ALT,
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STM_GPIO_DIRECTION_IN);
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/* PCI_INT0_SRC_SEL:
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* 0: PCI_INT_FROM_DEVICE[0] is from PIO6[0]
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* 1: PCI_INT_FROM_DEVICE[0] is from PIO15[3] */
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sc = sysconf_claim(SYS_CFG, 5, 27, 27, "PCI");
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sysconf_write(sc, 1);
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/* PCI_INT0_FROM_DEVICE:
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* 0: Indicates disabled
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* 1: Indicates PCI_INT_FROM_DEVICE[0] is enabled */
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sc = sysconf_claim(SYS_CFG, 5, 21, 21, "PCI");
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sysconf_write(sc, 1);
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break;
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case PCI_PIN_DEFAULT:
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if (!stm_pad_claim(pci_int_config + i, "PCI")) {
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printk(KERN_ERR "Failed to claim INT"
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"%c pad!\n", 'A' + i);
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BUG();
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}
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set_irq_type(ILC_EXT_IRQ(26 + i), IRQ_TYPE_LEVEL_LOW);
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if (i == 0) {
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/* PCI_INT0_SRC_SEL:
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* 0: PCI_INT_FROM_DEVICE[0] is from PIO6[0]
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* 1: PCI_INT_FROM_DEVICE[0] is from PIO15[3] */
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sc = sysconf_claim(SYS_CFG, 5, 27, 27, "PCI");
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sysconf_write(sc, 0);
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}
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/* PCI_INTn_FROM_DEVICE:
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* 0: Indicates disabled
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* 1: Indicates PCI_INT_FROM_DEVICE[n] is enabled */
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sc = sysconf_claim(SYS_CFG, 5, 21 - i, 21 - i, "PCI");
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sysconf_write(sc, 1);
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break;
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default:
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/* Unused or interrupt number passed, nothing to do */
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break;
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}
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}
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BUG_ON(pci_conf->pci_irq[3] != PCI_PIN_UNUSED);
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/* Configure the SERR interrupt (if wired up) */
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switch (pci_conf->serr_irq) {
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case PCI_PIN_DEFAULT:
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if (gpio_request(STX7105_PIO_PCI_SERR, "PCI_SERR#") == 0) {
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stm_gpio_direction(STX7105_PIO_PCI_SERR,
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STM_GPIO_DIRECTION_IN);
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pci_conf->serr_irq = gpio_to_irq(STX7105_PIO_PCI_SERR);
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set_irq_type(pci_conf->serr_irq, IRQ_TYPE_LEVEL_LOW);
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} else {
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printk(KERN_WARNING "%s(): Failed to claim PCI SERR# "
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"PIO!\n", __func__);
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pci_conf->serr_irq = PCI_PIN_UNUSED;
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}
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break;
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case PCI_PIN_ALTERNATIVE:
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/* No alternative here */
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BUG();
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pci_conf->serr_irq = PCI_PIN_UNUSED;
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break;
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}
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if (pci_conf->serr_irq != PCI_PIN_UNUSED) {
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struct resource *res;
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res = platform_get_resource_byname(&stx7105_pci_device,
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IORESOURCE_IRQ, "pci serr");
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BUG_ON(!res);
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res->start = pci_conf->serr_irq;
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res->end = pci_conf->serr_irq;
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}
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/* LOCK is not claimed as is totally pointless, the SOCs do not
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* support any form of coherency */
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stx7105_pci_device.dev.parent =
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bus_find_device_by_name(&platform_bus_type, NULL, "emi");
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platform_device_register(&stx7105_pci_device);
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}
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