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linux/arch/mips/pci/pci-ar2315.c
Thomas Gleixner bd0b9ac405 genirq: Remove irq argument from irq flow handlers 
Most interrupt flow handlers do not use the irq argument. Those few
which use it can retrieve the irq number from the irq descriptor.

Remove the argument.

Search and replace was done with coccinelle and some extra helper
scripts around it. Thanks to Julia for her help!

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
2015-09-16 15:47:51 +02:00

511 lines
15 KiB
C
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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/**
* Both AR2315 and AR2316 chips have PCI interface unit, which supports DMA
* and interrupt. PCI interface supports MMIO access method, but does not
* seem to support I/O ports.
*
* Read/write operation in the region 0x80000000-0xBFFFFFFF causes
* a memory read/write command on the PCI bus. 30 LSBs of address on
* the bus are taken from memory read/write request and 2 MSBs are
* determined by PCI unit configuration.
*
* To work with the configuration space instead of memory is necessary set
* the CFG_SEL bit in the PCI_MISC_CONFIG register.
*
* Devices on the bus can perform DMA requests via chip BAR1. PCI host
* controller BARs are programmend as if an external device is programmed.
* Which means that during configuration, IDSEL pin of the chip should be
* asserted.
*
* We know (and support) only one board that uses the PCI interface -
* Fonera 2.0g (FON2202). It has a USB EHCI controller connected to the
* AR2315 PCI bus. IDSEL pin of USB controller is connected to AD[13] line
* and IDSEL pin of AR2315 is connected to AD[16] line.
*/
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/io.h>
#include <asm/paccess.h>
/*
* PCI Bus Interface Registers
*/
#define AR2315_PCI_1MS_REG 0x0008
#define AR2315_PCI_1MS_MASK 0x3FFFF /* # of AHB clk cycles in 1ms */
#define AR2315_PCI_MISC_CONFIG 0x000c
#define AR2315_PCIMISC_TXD_EN 0x00000001 /* Enable TXD for fragments */
#define AR2315_PCIMISC_CFG_SEL 0x00000002 /* Mem or Config cycles */
#define AR2315_PCIMISC_GIG_MASK 0x0000000C /* bits 31-30 for pci req */
#define AR2315_PCIMISC_RST_MODE 0x00000030
#define AR2315_PCIRST_INPUT 0x00000000 /* 4:5=0 rst is input */
#define AR2315_PCIRST_LOW 0x00000010 /* 4:5=1 rst to GND */
#define AR2315_PCIRST_HIGH 0x00000020 /* 4:5=2 rst to VDD */
#define AR2315_PCIGRANT_EN 0x00000000 /* 6:7=0 early grant en */
#define AR2315_PCIGRANT_FRAME 0x00000040 /* 6:7=1 grant waits 4 frame */
#define AR2315_PCIGRANT_IDLE 0x00000080 /* 6:7=2 grant waits 4 idle */
#define AR2315_PCIGRANT_GAP 0x00000000 /* 6:7=2 grant waits 4 idle */
#define AR2315_PCICACHE_DIS 0x00001000 /* PCI external access cache
* disable */
#define AR2315_PCI_OUT_TSTAMP 0x0010
#define AR2315_PCI_UNCACHE_CFG 0x0014
#define AR2315_PCI_IN_EN 0x0100
#define AR2315_PCI_IN_EN0 0x01 /* Enable chain 0 */
#define AR2315_PCI_IN_EN1 0x02 /* Enable chain 1 */
#define AR2315_PCI_IN_EN2 0x04 /* Enable chain 2 */
#define AR2315_PCI_IN_EN3 0x08 /* Enable chain 3 */
#define AR2315_PCI_IN_DIS 0x0104
#define AR2315_PCI_IN_DIS0 0x01 /* Disable chain 0 */
#define AR2315_PCI_IN_DIS1 0x02 /* Disable chain 1 */
#define AR2315_PCI_IN_DIS2 0x04 /* Disable chain 2 */
#define AR2315_PCI_IN_DIS3 0x08 /* Disable chain 3 */
#define AR2315_PCI_IN_PTR 0x0200
#define AR2315_PCI_OUT_EN 0x0400
#define AR2315_PCI_OUT_EN0 0x01 /* Enable chain 0 */
#define AR2315_PCI_OUT_DIS 0x0404
#define AR2315_PCI_OUT_DIS0 0x01 /* Disable chain 0 */
#define AR2315_PCI_OUT_PTR 0x0408
/* PCI interrupt status (write one to clear) */
#define AR2315_PCI_ISR 0x0500
#define AR2315_PCI_INT_TX 0x00000001 /* Desc In Completed */
#define AR2315_PCI_INT_TXOK 0x00000002 /* Desc In OK */
#define AR2315_PCI_INT_TXERR 0x00000004 /* Desc In ERR */
#define AR2315_PCI_INT_TXEOL 0x00000008 /* Desc In End-of-List */
#define AR2315_PCI_INT_RX 0x00000010 /* Desc Out Completed */
#define AR2315_PCI_INT_RXOK 0x00000020 /* Desc Out OK */
#define AR2315_PCI_INT_RXERR 0x00000040 /* Desc Out ERR */
#define AR2315_PCI_INT_RXEOL 0x00000080 /* Desc Out EOL */
#define AR2315_PCI_INT_TXOOD 0x00000200 /* Desc In Out-of-Desc */
#define AR2315_PCI_INT_DESCMASK 0x0000FFFF /* Desc Mask */
#define AR2315_PCI_INT_EXT 0x02000000 /* Extern PCI INTA */
#define AR2315_PCI_INT_ABORT 0x04000000 /* PCI bus abort event */
/* PCI interrupt mask */
#define AR2315_PCI_IMR 0x0504
/* Global PCI interrupt enable */
#define AR2315_PCI_IER 0x0508
#define AR2315_PCI_IER_DISABLE 0x00 /* disable pci interrupts */
#define AR2315_PCI_IER_ENABLE 0x01 /* enable pci interrupts */
#define AR2315_PCI_HOST_IN_EN 0x0800
#define AR2315_PCI_HOST_IN_DIS 0x0804
#define AR2315_PCI_HOST_IN_PTR 0x0810
#define AR2315_PCI_HOST_OUT_EN 0x0900
#define AR2315_PCI_HOST_OUT_DIS 0x0904
#define AR2315_PCI_HOST_OUT_PTR 0x0908
/*
* PCI interrupts, which share IP5
* Keep ordered according to AR2315_PCI_INT_XXX bits
*/
#define AR2315_PCI_IRQ_EXT 25
#define AR2315_PCI_IRQ_ABORT 26
#define AR2315_PCI_IRQ_COUNT 27
/* Arbitrary size of memory region to access the configuration space */
#define AR2315_PCI_CFG_SIZE 0x00100000
#define AR2315_PCI_HOST_SLOT 3
#define AR2315_PCI_HOST_DEVID ((0xff18 << 16) | PCI_VENDOR_ID_ATHEROS)
/* ??? access BAR */
#define AR2315_PCI_HOST_MBAR0 0x10000000
/* RAM access BAR */
#define AR2315_PCI_HOST_MBAR1 AR2315_PCI_HOST_SDRAM_BASEADDR
/* ??? access BAR */
#define AR2315_PCI_HOST_MBAR2 0x30000000
struct ar2315_pci_ctrl {
void __iomem *cfg_mem;
void __iomem *mmr_mem;
unsigned irq;
unsigned irq_ext;
struct irq_domain *domain;
struct pci_controller pci_ctrl;
struct resource mem_res;
struct resource io_res;
};
static inline struct ar2315_pci_ctrl *ar2315_pci_bus_to_apc(struct pci_bus *bus)
{
struct pci_controller *hose = bus->sysdata;
return container_of(hose, struct ar2315_pci_ctrl, pci_ctrl);
}
static inline u32 ar2315_pci_reg_read(struct ar2315_pci_ctrl *apc, u32 reg)
{
return __raw_readl(apc->mmr_mem + reg);
}
static inline void ar2315_pci_reg_write(struct ar2315_pci_ctrl *apc, u32 reg,
u32 val)
{
__raw_writel(val, apc->mmr_mem + reg);
}
static inline void ar2315_pci_reg_mask(struct ar2315_pci_ctrl *apc, u32 reg,
u32 mask, u32 val)
{
u32 ret = ar2315_pci_reg_read(apc, reg);
ret &= ~mask;
ret |= val;
ar2315_pci_reg_write(apc, reg, ret);
}
static int ar2315_pci_cfg_access(struct ar2315_pci_ctrl *apc, unsigned devfn,
int where, int size, u32 *ptr, bool write)
{
int func = PCI_FUNC(devfn);
int dev = PCI_SLOT(devfn);
u32 addr = (1 << (13 + dev)) | (func << 8) | (where & ~3);
u32 mask = 0xffffffff >> 8 * (4 - size);
u32 sh = (where & 3) * 8;
u32 value, isr;
/* Prevent access past the remapped area */
if (addr >= AR2315_PCI_CFG_SIZE || dev > 18)
return PCIBIOS_DEVICE_NOT_FOUND;
/* Clear pending errors */
ar2315_pci_reg_write(apc, AR2315_PCI_ISR, AR2315_PCI_INT_ABORT);
/* Select Configuration access */
ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG, 0,
AR2315_PCIMISC_CFG_SEL);
mb(); /* PCI must see space change before we begin */
value = __raw_readl(apc->cfg_mem + addr);
isr = ar2315_pci_reg_read(apc, AR2315_PCI_ISR);
if (isr & AR2315_PCI_INT_ABORT)
goto exit_err;
if (write) {
value = (value & ~(mask << sh)) | *ptr << sh;
__raw_writel(value, apc->cfg_mem + addr);
isr = ar2315_pci_reg_read(apc, AR2315_PCI_ISR);
if (isr & AR2315_PCI_INT_ABORT)
goto exit_err;
} else {
*ptr = (value >> sh) & mask;
}
goto exit;
exit_err:
ar2315_pci_reg_write(apc, AR2315_PCI_ISR, AR2315_PCI_INT_ABORT);
if (!write)
*ptr = 0xffffffff;
exit:
/* Select Memory access */
ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG, AR2315_PCIMISC_CFG_SEL,
0);
return isr & AR2315_PCI_INT_ABORT ? PCIBIOS_DEVICE_NOT_FOUND :
PCIBIOS_SUCCESSFUL;
}
static inline int ar2315_pci_local_cfg_rd(struct ar2315_pci_ctrl *apc,
unsigned devfn, int where, u32 *val)
{
return ar2315_pci_cfg_access(apc, devfn, where, sizeof(u32), val,
false);
}
static inline int ar2315_pci_local_cfg_wr(struct ar2315_pci_ctrl *apc,
unsigned devfn, int where, u32 val)
{
return ar2315_pci_cfg_access(apc, devfn, where, sizeof(u32), &val,
true);
}
static int ar2315_pci_cfg_read(struct pci_bus *bus, unsigned devfn, int where,
int size, u32 *value)
{
struct ar2315_pci_ctrl *apc = ar2315_pci_bus_to_apc(bus);
if (PCI_SLOT(devfn) == AR2315_PCI_HOST_SLOT)
return PCIBIOS_DEVICE_NOT_FOUND;
return ar2315_pci_cfg_access(apc, devfn, where, size, value, false);
}
static int ar2315_pci_cfg_write(struct pci_bus *bus, unsigned devfn, int where,
int size, u32 value)
{
struct ar2315_pci_ctrl *apc = ar2315_pci_bus_to_apc(bus);
if (PCI_SLOT(devfn) == AR2315_PCI_HOST_SLOT)
return PCIBIOS_DEVICE_NOT_FOUND;
return ar2315_pci_cfg_access(apc, devfn, where, size, &value, true);
}
static struct pci_ops ar2315_pci_ops = {
.read = ar2315_pci_cfg_read,
.write = ar2315_pci_cfg_write,
};
static int ar2315_pci_host_setup(struct ar2315_pci_ctrl *apc)
{
unsigned devfn = PCI_DEVFN(AR2315_PCI_HOST_SLOT, 0);
int res;
u32 id;
res = ar2315_pci_local_cfg_rd(apc, devfn, PCI_VENDOR_ID, &id);
if (res != PCIBIOS_SUCCESSFUL || id != AR2315_PCI_HOST_DEVID)
return -ENODEV;
/* Program MBARs */
ar2315_pci_local_cfg_wr(apc, devfn, PCI_BASE_ADDRESS_0,
AR2315_PCI_HOST_MBAR0);
ar2315_pci_local_cfg_wr(apc, devfn, PCI_BASE_ADDRESS_1,
AR2315_PCI_HOST_MBAR1);
ar2315_pci_local_cfg_wr(apc, devfn, PCI_BASE_ADDRESS_2,
AR2315_PCI_HOST_MBAR2);
/* Run */
ar2315_pci_local_cfg_wr(apc, devfn, PCI_COMMAND, PCI_COMMAND_MEMORY |
PCI_COMMAND_MASTER | PCI_COMMAND_SPECIAL |
PCI_COMMAND_INVALIDATE | PCI_COMMAND_PARITY |
PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK);
return 0;
}
static void ar2315_pci_irq_handler(struct irq_desc *desc)
{
struct ar2315_pci_ctrl *apc = irq_desc_get_handler_data(desc);
u32 pending = ar2315_pci_reg_read(apc, AR2315_PCI_ISR) &
ar2315_pci_reg_read(apc, AR2315_PCI_IMR);
unsigned pci_irq = 0;
if (pending)
pci_irq = irq_find_mapping(apc->domain, __ffs(pending));
if (pci_irq)
generic_handle_irq(pci_irq);
else
spurious_interrupt();
}
static void ar2315_pci_irq_mask(struct irq_data *d)
{
struct ar2315_pci_ctrl *apc = irq_data_get_irq_chip_data(d);
ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, BIT(d->hwirq), 0);
}
static void ar2315_pci_irq_mask_ack(struct irq_data *d)
{
struct ar2315_pci_ctrl *apc = irq_data_get_irq_chip_data(d);
u32 m = BIT(d->hwirq);
ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, m, 0);
ar2315_pci_reg_write(apc, AR2315_PCI_ISR, m);
}
static void ar2315_pci_irq_unmask(struct irq_data *d)
{
struct ar2315_pci_ctrl *apc = irq_data_get_irq_chip_data(d);
ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, 0, BIT(d->hwirq));
}
static struct irq_chip ar2315_pci_irq_chip = {
.name = "AR2315-PCI",
.irq_mask = ar2315_pci_irq_mask,
.irq_mask_ack = ar2315_pci_irq_mask_ack,
.irq_unmask = ar2315_pci_irq_unmask,
};
static int ar2315_pci_irq_map(struct irq_domain *d, unsigned irq,
irq_hw_number_t hw)
{
irq_set_chip_and_handler(irq, &ar2315_pci_irq_chip, handle_level_irq);
irq_set_chip_data(irq, d->host_data);
return 0;
}
static struct irq_domain_ops ar2315_pci_irq_domain_ops = {
.map = ar2315_pci_irq_map,
};
static void ar2315_pci_irq_init(struct ar2315_pci_ctrl *apc)
{
ar2315_pci_reg_mask(apc, AR2315_PCI_IER, AR2315_PCI_IER_ENABLE, 0);
ar2315_pci_reg_mask(apc, AR2315_PCI_IMR, (AR2315_PCI_INT_ABORT |
AR2315_PCI_INT_EXT), 0);
apc->irq_ext = irq_create_mapping(apc->domain, AR2315_PCI_IRQ_EXT);
irq_set_chained_handler_and_data(apc->irq, ar2315_pci_irq_handler,
apc);
/* Clear any pending Abort or external Interrupts
* and enable interrupt processing */
ar2315_pci_reg_write(apc, AR2315_PCI_ISR, AR2315_PCI_INT_ABORT |
AR2315_PCI_INT_EXT);
ar2315_pci_reg_mask(apc, AR2315_PCI_IER, 0, AR2315_PCI_IER_ENABLE);
}
static int ar2315_pci_probe(struct platform_device *pdev)
{
struct ar2315_pci_ctrl *apc;
struct device *dev = &pdev->dev;
struct resource *res;
int irq, err;
apc = devm_kzalloc(dev, sizeof(*apc), GFP_KERNEL);
if (!apc)
return -ENOMEM;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return -EINVAL;
apc->irq = irq;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"ar2315-pci-ctrl");
apc->mmr_mem = devm_ioremap_resource(dev, res);
if (IS_ERR(apc->mmr_mem))
return PTR_ERR(apc->mmr_mem);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"ar2315-pci-ext");
if (!res)
return -EINVAL;
apc->mem_res.name = "AR2315 PCI mem space";
apc->mem_res.parent = res;
apc->mem_res.start = res->start;
apc->mem_res.end = res->end;
apc->mem_res.flags = IORESOURCE_MEM;
/* Remap PCI config space */
apc->cfg_mem = devm_ioremap_nocache(dev, res->start,
AR2315_PCI_CFG_SIZE);
if (!apc->cfg_mem) {
dev_err(dev, "failed to remap PCI config space\n");
return -ENOMEM;
}
/* Reset the PCI bus by setting bits 5-4 in PCI_MCFG */
ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG,
AR2315_PCIMISC_RST_MODE,
AR2315_PCIRST_LOW);
msleep(100);
/* Bring the PCI out of reset */
ar2315_pci_reg_mask(apc, AR2315_PCI_MISC_CONFIG,
AR2315_PCIMISC_RST_MODE,
AR2315_PCIRST_HIGH | AR2315_PCICACHE_DIS | 0x8);
ar2315_pci_reg_write(apc, AR2315_PCI_UNCACHE_CFG,
0x1E | /* 1GB uncached */
(1 << 5) | /* Enable uncached */
(0x2 << 30) /* Base: 0x80000000 */);
ar2315_pci_reg_read(apc, AR2315_PCI_UNCACHE_CFG);
msleep(500);
err = ar2315_pci_host_setup(apc);
if (err)
return err;
apc->domain = irq_domain_add_linear(NULL, AR2315_PCI_IRQ_COUNT,
&ar2315_pci_irq_domain_ops, apc);
if (!apc->domain) {
dev_err(dev, "failed to add IRQ domain\n");
return -ENOMEM;
}
ar2315_pci_irq_init(apc);
/* PCI controller does not support I/O ports */
apc->io_res.name = "AR2315 IO space";
apc->io_res.start = 0;
apc->io_res.end = 0;
apc->io_res.flags = IORESOURCE_IO,
apc->pci_ctrl.pci_ops = &ar2315_pci_ops;
apc->pci_ctrl.mem_resource = &apc->mem_res,
apc->pci_ctrl.io_resource = &apc->io_res,
register_pci_controller(&apc->pci_ctrl);
dev_info(dev, "register PCI controller\n");
return 0;
}
static struct platform_driver ar2315_pci_driver = {
.probe = ar2315_pci_probe,
.driver = {
.name = "ar2315-pci",
},
};
static int __init ar2315_pci_init(void)
{
return platform_driver_register(&ar2315_pci_driver);
}
arch_initcall(ar2315_pci_init);
int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
struct ar2315_pci_ctrl *apc = ar2315_pci_bus_to_apc(dev->bus);
return slot ? 0 : apc->irq_ext;
}
int pcibios_plat_dev_init(struct pci_dev *dev)
{
return 0;
}
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