405 lines
10 KiB
C
405 lines
10 KiB
C
/*
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* Atheros AR71xx PCI host controller driver
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*
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* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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*
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* Parts of this file are based on Atheros' 2.6.15 BSP
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/resource.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/bitops.h>
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#include <linux/pci.h>
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#include <linux/pci_regs.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <asm/mach-ath79/ar71xx_regs.h>
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#include <asm/mach-ath79/ath79.h>
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#define AR71XX_PCI_REG_CRP_AD_CBE 0x00
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#define AR71XX_PCI_REG_CRP_WRDATA 0x04
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#define AR71XX_PCI_REG_CRP_RDDATA 0x08
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#define AR71XX_PCI_REG_CFG_AD 0x0c
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#define AR71XX_PCI_REG_CFG_CBE 0x10
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#define AR71XX_PCI_REG_CFG_WRDATA 0x14
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#define AR71XX_PCI_REG_CFG_RDDATA 0x18
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#define AR71XX_PCI_REG_PCI_ERR 0x1c
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#define AR71XX_PCI_REG_PCI_ERR_ADDR 0x20
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#define AR71XX_PCI_REG_AHB_ERR 0x24
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#define AR71XX_PCI_REG_AHB_ERR_ADDR 0x28
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#define AR71XX_PCI_CRP_CMD_WRITE 0x00010000
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#define AR71XX_PCI_CRP_CMD_READ 0x00000000
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#define AR71XX_PCI_CFG_CMD_READ 0x0000000a
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#define AR71XX_PCI_CFG_CMD_WRITE 0x0000000b
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#define AR71XX_PCI_INT_CORE BIT(4)
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#define AR71XX_PCI_INT_DEV2 BIT(2)
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#define AR71XX_PCI_INT_DEV1 BIT(1)
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#define AR71XX_PCI_INT_DEV0 BIT(0)
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#define AR71XX_PCI_IRQ_COUNT 5
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struct ar71xx_pci_controller {
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void __iomem *cfg_base;
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int irq;
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int irq_base;
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struct pci_controller pci_ctrl;
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struct resource io_res;
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struct resource mem_res;
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};
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/* Byte lane enable bits */
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static const u8 ar71xx_pci_ble_table[4][4] = {
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{0x0, 0xf, 0xf, 0xf},
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{0xe, 0xd, 0xb, 0x7},
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{0xc, 0xf, 0x3, 0xf},
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{0xf, 0xf, 0xf, 0xf},
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};
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static const u32 ar71xx_pci_read_mask[8] = {
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0, 0xff, 0xffff, 0, 0xffffffff, 0, 0, 0
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};
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static inline u32 ar71xx_pci_get_ble(int where, int size, int local)
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{
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u32 t;
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t = ar71xx_pci_ble_table[size & 3][where & 3];
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BUG_ON(t == 0xf);
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t <<= (local) ? 20 : 4;
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return t;
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}
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static inline u32 ar71xx_pci_bus_addr(struct pci_bus *bus, unsigned int devfn,
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int where)
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{
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u32 ret;
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if (!bus->number) {
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/* type 0 */
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ret = (1 << PCI_SLOT(devfn)) | (PCI_FUNC(devfn) << 8) |
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(where & ~3);
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} else {
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/* type 1 */
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ret = (bus->number << 16) | (PCI_SLOT(devfn) << 11) |
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(PCI_FUNC(devfn) << 8) | (where & ~3) | 1;
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}
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return ret;
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}
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static inline struct ar71xx_pci_controller *
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pci_bus_to_ar71xx_controller(struct pci_bus *bus)
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{
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struct pci_controller *hose;
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hose = (struct pci_controller *) bus->sysdata;
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return container_of(hose, struct ar71xx_pci_controller, pci_ctrl);
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}
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static int ar71xx_pci_check_error(struct ar71xx_pci_controller *apc, int quiet)
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{
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void __iomem *base = apc->cfg_base;
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u32 pci_err;
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u32 ahb_err;
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pci_err = __raw_readl(base + AR71XX_PCI_REG_PCI_ERR) & 3;
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if (pci_err) {
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if (!quiet) {
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u32 addr;
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addr = __raw_readl(base + AR71XX_PCI_REG_PCI_ERR_ADDR);
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pr_crit("ar71xx: %s bus error %d at addr 0x%x\n",
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"PCI", pci_err, addr);
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}
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/* clear PCI error status */
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__raw_writel(pci_err, base + AR71XX_PCI_REG_PCI_ERR);
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}
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ahb_err = __raw_readl(base + AR71XX_PCI_REG_AHB_ERR) & 1;
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if (ahb_err) {
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if (!quiet) {
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u32 addr;
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addr = __raw_readl(base + AR71XX_PCI_REG_AHB_ERR_ADDR);
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pr_crit("ar71xx: %s bus error %d at addr 0x%x\n",
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"AHB", ahb_err, addr);
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}
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/* clear AHB error status */
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__raw_writel(ahb_err, base + AR71XX_PCI_REG_AHB_ERR);
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}
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return !!(ahb_err | pci_err);
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}
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static inline void ar71xx_pci_local_write(struct ar71xx_pci_controller *apc,
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int where, int size, u32 value)
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{
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void __iomem *base = apc->cfg_base;
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u32 ad_cbe;
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value = value << (8 * (where & 3));
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ad_cbe = AR71XX_PCI_CRP_CMD_WRITE | (where & ~3);
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ad_cbe |= ar71xx_pci_get_ble(where, size, 1);
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__raw_writel(ad_cbe, base + AR71XX_PCI_REG_CRP_AD_CBE);
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__raw_writel(value, base + AR71XX_PCI_REG_CRP_WRDATA);
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}
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static inline int ar71xx_pci_set_cfgaddr(struct pci_bus *bus,
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unsigned int devfn,
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int where, int size, u32 cmd)
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{
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struct ar71xx_pci_controller *apc = pci_bus_to_ar71xx_controller(bus);
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void __iomem *base = apc->cfg_base;
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u32 addr;
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addr = ar71xx_pci_bus_addr(bus, devfn, where);
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__raw_writel(addr, base + AR71XX_PCI_REG_CFG_AD);
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__raw_writel(cmd | ar71xx_pci_get_ble(where, size, 0),
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base + AR71XX_PCI_REG_CFG_CBE);
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return ar71xx_pci_check_error(apc, 1);
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}
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static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 *value)
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{
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struct ar71xx_pci_controller *apc = pci_bus_to_ar71xx_controller(bus);
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void __iomem *base = apc->cfg_base;
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u32 data;
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int err;
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int ret;
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ret = PCIBIOS_SUCCESSFUL;
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data = ~0;
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err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
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AR71XX_PCI_CFG_CMD_READ);
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if (err)
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ret = PCIBIOS_DEVICE_NOT_FOUND;
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else
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data = __raw_readl(base + AR71XX_PCI_REG_CFG_RDDATA);
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*value = (data >> (8 * (where & 3))) & ar71xx_pci_read_mask[size & 7];
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return ret;
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}
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static int ar71xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 value)
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{
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struct ar71xx_pci_controller *apc = pci_bus_to_ar71xx_controller(bus);
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void __iomem *base = apc->cfg_base;
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int err;
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int ret;
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value = value << (8 * (where & 3));
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ret = PCIBIOS_SUCCESSFUL;
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err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
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AR71XX_PCI_CFG_CMD_WRITE);
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if (err)
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ret = PCIBIOS_DEVICE_NOT_FOUND;
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else
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__raw_writel(value, base + AR71XX_PCI_REG_CFG_WRDATA);
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return ret;
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}
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static struct pci_ops ar71xx_pci_ops = {
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.read = ar71xx_pci_read_config,
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.write = ar71xx_pci_write_config,
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};
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static void ar71xx_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
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{
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struct ar71xx_pci_controller *apc;
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void __iomem *base = ath79_reset_base;
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u32 pending;
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apc = irq_desc_get_handler_data(desc);
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pending = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_STATUS) &
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__raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
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if (pending & AR71XX_PCI_INT_DEV0)
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generic_handle_irq(apc->irq_base + 0);
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else if (pending & AR71XX_PCI_INT_DEV1)
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generic_handle_irq(apc->irq_base + 1);
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else if (pending & AR71XX_PCI_INT_DEV2)
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generic_handle_irq(apc->irq_base + 2);
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else if (pending & AR71XX_PCI_INT_CORE)
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generic_handle_irq(apc->irq_base + 4);
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else
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spurious_interrupt();
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}
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static void ar71xx_pci_irq_unmask(struct irq_data *d)
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{
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struct ar71xx_pci_controller *apc;
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unsigned int irq;
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void __iomem *base = ath79_reset_base;
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u32 t;
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apc = irq_data_get_irq_chip_data(d);
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irq = d->irq - apc->irq_base;
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t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
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__raw_writel(t | (1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
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/* flush write */
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__raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
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}
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static void ar71xx_pci_irq_mask(struct irq_data *d)
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{
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struct ar71xx_pci_controller *apc;
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unsigned int irq;
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void __iomem *base = ath79_reset_base;
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u32 t;
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apc = irq_data_get_irq_chip_data(d);
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irq = d->irq - apc->irq_base;
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t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
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__raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
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/* flush write */
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__raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
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}
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static struct irq_chip ar71xx_pci_irq_chip = {
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.name = "AR71XX PCI",
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.irq_mask = ar71xx_pci_irq_mask,
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.irq_unmask = ar71xx_pci_irq_unmask,
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.irq_mask_ack = ar71xx_pci_irq_mask,
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};
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static void ar71xx_pci_irq_init(struct ar71xx_pci_controller *apc)
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{
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void __iomem *base = ath79_reset_base;
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int i;
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__raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_ENABLE);
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__raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_STATUS);
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BUILD_BUG_ON(ATH79_PCI_IRQ_COUNT < AR71XX_PCI_IRQ_COUNT);
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apc->irq_base = ATH79_PCI_IRQ_BASE;
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for (i = apc->irq_base;
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i < apc->irq_base + AR71XX_PCI_IRQ_COUNT; i++) {
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irq_set_chip_and_handler(i, &ar71xx_pci_irq_chip,
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handle_level_irq);
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irq_set_chip_data(i, apc);
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}
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irq_set_handler_data(apc->irq, apc);
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irq_set_chained_handler(apc->irq, ar71xx_pci_irq_handler);
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}
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static void ar71xx_pci_reset(void)
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{
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ath79_device_reset_set(AR71XX_RESET_PCI_BUS | AR71XX_RESET_PCI_CORE);
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mdelay(100);
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ath79_device_reset_clear(AR71XX_RESET_PCI_BUS | AR71XX_RESET_PCI_CORE);
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mdelay(100);
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ath79_ddr_set_pci_windows();
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mdelay(100);
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}
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static int ar71xx_pci_probe(struct platform_device *pdev)
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{
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struct ar71xx_pci_controller *apc;
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struct resource *res;
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u32 t;
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apc = devm_kzalloc(&pdev->dev, sizeof(struct ar71xx_pci_controller),
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GFP_KERNEL);
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if (!apc)
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return -ENOMEM;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg_base");
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apc->cfg_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(apc->cfg_base))
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return PTR_ERR(apc->cfg_base);
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apc->irq = platform_get_irq(pdev, 0);
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if (apc->irq < 0)
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return -EINVAL;
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res = platform_get_resource_byname(pdev, IORESOURCE_IO, "io_base");
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if (!res)
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return -EINVAL;
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apc->io_res.parent = res;
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apc->io_res.name = "PCI IO space";
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apc->io_res.start = res->start;
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apc->io_res.end = res->end;
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apc->io_res.flags = IORESOURCE_IO;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem_base");
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if (!res)
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return -EINVAL;
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apc->mem_res.parent = res;
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apc->mem_res.name = "PCI memory space";
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apc->mem_res.start = res->start;
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apc->mem_res.end = res->end;
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apc->mem_res.flags = IORESOURCE_MEM;
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ar71xx_pci_reset();
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/* setup COMMAND register */
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t = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
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| PCI_COMMAND_PARITY | PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK;
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ar71xx_pci_local_write(apc, PCI_COMMAND, 4, t);
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/* clear bus errors */
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ar71xx_pci_check_error(apc, 1);
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ar71xx_pci_irq_init(apc);
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apc->pci_ctrl.pci_ops = &ar71xx_pci_ops;
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apc->pci_ctrl.mem_resource = &apc->mem_res;
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apc->pci_ctrl.io_resource = &apc->io_res;
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register_pci_controller(&apc->pci_ctrl);
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return 0;
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}
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static struct platform_driver ar71xx_pci_driver = {
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.probe = ar71xx_pci_probe,
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.driver = {
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.name = "ar71xx-pci",
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},
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};
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static int __init ar71xx_pci_init(void)
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{
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return platform_driver_register(&ar71xx_pci_driver);
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}
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postcore_initcall(ar71xx_pci_init);
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