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/*
* linux/arch/arm/mach-integrator/pci_v3.c
*
* PCI functions for V3 host PCI bridge
*
* Copyright (C) 1999 ARM Limited
* Copyright (C) 2000-2001 Deep Blue Solutions Ltd
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>
#include <video/vga.h>
#include <asm/mach/map.h>
#include <asm/signal.h>
#include <asm/mach/pci.h>
#include <asm/irq_regs.h>
#include "pci_v3.h"
#include "hardware.h"
/*
* Where in the memory map does PCI live?
*
* This represents a fairly liberal usage of address space. Even though
* the V3 only has two windows (therefore we need to map stuff on the fly),
* we maintain the same addresses, even if they're not mapped.
*/
#define PHYS_PCI_MEM_BASE 0x40000000 /* 256M */
#define PHYS_PCI_PRE_BASE 0x50000000 /* 256M */
#define PHYS_PCI_IO_BASE 0x60000000 /* 16M */
#define PHYS_PCI_CONFIG_BASE 0x61000000 /* 16M */
#define PHYS_PCI_V3_BASE 0x62000000 /* 64K */
#define PCI_MEMORY_VADDR IOMEM(0xe8000000)
#define PCI_CONFIG_VADDR IOMEM(0xec000000)
/*
* V3 Local Bus to PCI Bridge definitions
*
* Registers (these are taken from page 129 of the EPC User's Manual Rev 1.04
* All V3 register names are prefaced by V3_ to avoid clashing with any other
* PCI definitions. Their names match the user's manual.
*
* I'm assuming that I20 is disabled.
*
*/
#define V3_PCI_VENDOR 0x00000000
#define V3_PCI_DEVICE 0x00000002
#define V3_PCI_CMD 0x00000004
#define V3_PCI_STAT 0x00000006
#define V3_PCI_CC_REV 0x00000008
#define V3_PCI_HDR_CFG 0x0000000C
#define V3_PCI_IO_BASE 0x00000010
#define V3_PCI_BASE0 0x00000014
#define V3_PCI_BASE1 0x00000018
#define V3_PCI_SUB_VENDOR 0x0000002C
#define V3_PCI_SUB_ID 0x0000002E
#define V3_PCI_ROM 0x00000030
#define V3_PCI_BPARAM 0x0000003C
#define V3_PCI_MAP0 0x00000040
#define V3_PCI_MAP1 0x00000044
#define V3_PCI_INT_STAT 0x00000048
#define V3_PCI_INT_CFG 0x0000004C
#define V3_LB_BASE0 0x00000054
#define V3_LB_BASE1 0x00000058
#define V3_LB_MAP0 0x0000005E
#define V3_LB_MAP1 0x00000062
#define V3_LB_BASE2 0x00000064
#define V3_LB_MAP2 0x00000066
#define V3_LB_SIZE 0x00000068
#define V3_LB_IO_BASE 0x0000006E
#define V3_FIFO_CFG 0x00000070
#define V3_FIFO_PRIORITY 0x00000072
#define V3_FIFO_STAT 0x00000074
#define V3_LB_ISTAT 0x00000076
#define V3_LB_IMASK 0x00000077
#define V3_SYSTEM 0x00000078
#define V3_LB_CFG 0x0000007A
#define V3_PCI_CFG 0x0000007C
#define V3_DMA_PCI_ADR0 0x00000080
#define V3_DMA_PCI_ADR1 0x00000090
#define V3_DMA_LOCAL_ADR0 0x00000084
#define V3_DMA_LOCAL_ADR1 0x00000094
#define V3_DMA_LENGTH0 0x00000088
#define V3_DMA_LENGTH1 0x00000098
#define V3_DMA_CSR0 0x0000008B
#define V3_DMA_CSR1 0x0000009B
#define V3_DMA_CTLB_ADR0 0x0000008C
#define V3_DMA_CTLB_ADR1 0x0000009C
#define V3_DMA_DELAY 0x000000E0
#define V3_MAIL_DATA 0x000000C0
#define V3_PCI_MAIL_IEWR 0x000000D0
#define V3_PCI_MAIL_IERD 0x000000D2
#define V3_LB_MAIL_IEWR 0x000000D4
#define V3_LB_MAIL_IERD 0x000000D6
#define V3_MAIL_WR_STAT 0x000000D8
#define V3_MAIL_RD_STAT 0x000000DA
#define V3_QBA_MAP 0x000000DC
/* PCI COMMAND REGISTER bits
*/
#define V3_COMMAND_M_FBB_EN (1 << 9)
#define V3_COMMAND_M_SERR_EN (1 << 8)
#define V3_COMMAND_M_PAR_EN (1 << 6)
#define V3_COMMAND_M_MASTER_EN (1 << 2)
#define V3_COMMAND_M_MEM_EN (1 << 1)
#define V3_COMMAND_M_IO_EN (1 << 0)
/* SYSTEM REGISTER bits
*/
#define V3_SYSTEM_M_RST_OUT (1 << 15)
#define V3_SYSTEM_M_LOCK (1 << 14)
/* PCI_CFG bits
*/
#define V3_PCI_CFG_M_I2O_EN (1 << 15)
#define V3_PCI_CFG_M_IO_REG_DIS (1 << 14)
#define V3_PCI_CFG_M_IO_DIS (1 << 13)
#define V3_PCI_CFG_M_EN3V (1 << 12)
#define V3_PCI_CFG_M_RETRY_EN (1 << 10)
#define V3_PCI_CFG_M_AD_LOW1 (1 << 9)
#define V3_PCI_CFG_M_AD_LOW0 (1 << 8)
/* PCI_BASE register bits (PCI -> Local Bus)
*/
#define V3_PCI_BASE_M_ADR_BASE 0xFFF00000
#define V3_PCI_BASE_M_ADR_BASEL 0x000FFF00
#define V3_PCI_BASE_M_PREFETCH (1 << 3)
#define V3_PCI_BASE_M_TYPE (3 << 1)
#define V3_PCI_BASE_M_IO (1 << 0)
/* PCI MAP register bits (PCI -> Local bus)
*/
#define V3_PCI_MAP_M_MAP_ADR 0xFFF00000
#define V3_PCI_MAP_M_RD_POST_INH (1 << 15)
#define V3_PCI_MAP_M_ROM_SIZE (3 << 10)
#define V3_PCI_MAP_M_SWAP (3 << 8)
#define V3_PCI_MAP_M_ADR_SIZE 0x000000F0
#define V3_PCI_MAP_M_REG_EN (1 << 1)
#define V3_PCI_MAP_M_ENABLE (1 << 0)
/*
* LB_BASE0,1 register bits (Local bus -> PCI)
*/
#define V3_LB_BASE_ADR_BASE 0xfff00000
#define V3_LB_BASE_SWAP (3 << 8)
#define V3_LB_BASE_ADR_SIZE (15 << 4)
#define V3_LB_BASE_PREFETCH (1 << 3)
#define V3_LB_BASE_ENABLE (1 << 0)
#define V3_LB_BASE_ADR_SIZE_1MB (0 << 4)
#define V3_LB_BASE_ADR_SIZE_2MB (1 << 4)
#define V3_LB_BASE_ADR_SIZE_4MB (2 << 4)
#define V3_LB_BASE_ADR_SIZE_8MB (3 << 4)
#define V3_LB_BASE_ADR_SIZE_16MB (4 << 4)
#define V3_LB_BASE_ADR_SIZE_32MB (5 << 4)
#define V3_LB_BASE_ADR_SIZE_64MB (6 << 4)
#define V3_LB_BASE_ADR_SIZE_128MB (7 << 4)
#define V3_LB_BASE_ADR_SIZE_256MB (8 << 4)
#define V3_LB_BASE_ADR_SIZE_512MB (9 << 4)
#define V3_LB_BASE_ADR_SIZE_1GB (10 << 4)
#define V3_LB_BASE_ADR_SIZE_2GB (11 << 4)
#define v3_addr_to_lb_base(a) ((a) & V3_LB_BASE_ADR_BASE)
/*
* LB_MAP0,1 register bits (Local bus -> PCI)
*/
#define V3_LB_MAP_MAP_ADR 0xfff0
#define V3_LB_MAP_TYPE (7 << 1)
#define V3_LB_MAP_AD_LOW_EN (1 << 0)
#define V3_LB_MAP_TYPE_IACK (0 << 1)
#define V3_LB_MAP_TYPE_IO (1 << 1)
#define V3_LB_MAP_TYPE_MEM (3 << 1)
#define V3_LB_MAP_TYPE_CONFIG (5 << 1)
#define V3_LB_MAP_TYPE_MEM_MULTIPLE (6 << 1)
#define v3_addr_to_lb_map(a) (((a) >> 16) & V3_LB_MAP_MAP_ADR)
/*
* LB_BASE2 register bits (Local bus -> PCI IO)
*/
#define V3_LB_BASE2_ADR_BASE 0xff00
#define V3_LB_BASE2_SWAP (3 << 6)
#define V3_LB_BASE2_ENABLE (1 << 0)
#define v3_addr_to_lb_base2(a) (((a) >> 16) & V3_LB_BASE2_ADR_BASE)
/*
* LB_MAP2 register bits (Local bus -> PCI IO)
*/
#define V3_LB_MAP2_MAP_ADR 0xff00
#define v3_addr_to_lb_map2(a) (((a) >> 16) & V3_LB_MAP2_MAP_ADR)
/*
* The V3 PCI interface chip in Integrator provides several windows from
* local bus memory into the PCI memory areas. Unfortunately, there
* are not really enough windows for our usage, therefore we reuse
* one of the windows for access to PCI configuration space. The
* memory map is as follows:
*
* Local Bus Memory Usage
*
* 40000000 - 4FFFFFFF PCI memory. 256M non-prefetchable
* 50000000 - 5FFFFFFF PCI memory. 256M prefetchable
* 60000000 - 60FFFFFF PCI IO. 16M
* 61000000 - 61FFFFFF PCI Configuration. 16M
*
* There are three V3 windows, each described by a pair of V3 registers.
* These are LB_BASE0/LB_MAP0, LB_BASE1/LB_MAP1 and LB_BASE2/LB_MAP2.
* Base0 and Base1 can be used for any type of PCI memory access. Base2
* can be used either for PCI I/O or for I20 accesses. By default, uHAL
* uses this only for PCI IO space.
*
* Normally these spaces are mapped using the following base registers:
*
* Usage Local Bus Memory Base/Map registers used
*
* Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
* Mem 50000000 - 5FFFFFFF LB_BASE1/LB_MAP1
* IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
* Cfg 61000000 - 61FFFFFF
*
* This means that I20 and PCI configuration space accesses will fail.
* When PCI configuration accesses are needed (via the uHAL PCI
* configuration space primitives) we must remap the spaces as follows:
*
* Usage Local Bus Memory Base/Map registers used
*
* Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
* Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0
* IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
* Cfg 61000000 - 61FFFFFF LB_BASE1/LB_MAP1
*
* To make this work, the code depends on overlapping windows working.
* The V3 chip translates an address by checking its range within
* each of the BASE/MAP pairs in turn (in ascending register number
* order). It will use the first matching pair. So, for example,
* if the same address is mapped by both LB_BASE0/LB_MAP0 and
* LB_BASE1/LB_MAP1, the V3 will use the translation from
* LB_BASE0/LB_MAP0.
*
* To allow PCI Configuration space access, the code enlarges the
* window mapped by LB_BASE0/LB_MAP0 from 256M to 512M. This occludes
* the windows currently mapped by LB_BASE1/LB_MAP1 so that it can
* be remapped for use by configuration cycles.
*
* At the end of the PCI Configuration space accesses,
* LB_BASE1/LB_MAP1 is reset to map PCI Memory. Finally the window
* mapped by LB_BASE0/LB_MAP0 is reduced in size from 512M to 256M to
* reveal the now restored LB_BASE1/LB_MAP1 window.
*
* NOTE: We do not set up I2O mapping. I suspect that this is only
* for an intelligent (target) device. Using I2O disables most of
* the mappings into PCI memory.
*/
/* Filled in by probe */
static void __iomem *pci_v3_base;
/* CPU side memory ranges */
static struct resource conf_mem; /* FIXME: remap this instead of static map */
static struct resource io_mem;
static struct resource non_mem;
static struct resource pre_mem;
/* PCI side memory ranges */
static u64 non_mem_pci;
static u64 non_mem_pci_sz;
static u64 pre_mem_pci;
static u64 pre_mem_pci_sz;
// V3 access routines
#define v3_writeb(o,v) __raw_writeb(v, pci_v3_base + (unsigned int)(o))
#define v3_readb(o) (__raw_readb(pci_v3_base + (unsigned int)(o)))
#define v3_writew(o,v) __raw_writew(v, pci_v3_base + (unsigned int)(o))
#define v3_readw(o) (__raw_readw(pci_v3_base + (unsigned int)(o)))
#define v3_writel(o,v) __raw_writel(v, pci_v3_base + (unsigned int)(o))
#define v3_readl(o) (__raw_readl(pci_v3_base + (unsigned int)(o)))
/*============================================================================
*
* routine: uHALir_PCIMakeConfigAddress()
*
* parameters: bus = which bus
* device = which device
* function = which function
* offset = configuration space register we are interested in
*
* description: this routine will generate a platform dependent config
* address.
*
* calls: none
*
* returns: configuration address to play on the PCI bus
*
* To generate the appropriate PCI configuration cycles in the PCI
* configuration address space, you present the V3 with the following pattern
* (which is very nearly a type 1 (except that the lower two bits are 00 and
* not 01). In order for this mapping to work you need to set up one of
* the local to PCI aperatures to 16Mbytes in length translating to
* PCI configuration space starting at 0x0000.0000.
*
* PCI configuration cycles look like this:
*
* Type 0:
*
* 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
* 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | |D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|0|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* 31:11 Device select bit.
* 10:8 Function number
* 7:2 Register number
*
* Type 1:
*
* 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
* 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* 31:24 reserved
* 23:16 bus number (8 bits = 128 possible buses)
* 15:11 Device number (5 bits)
* 10:8 function number
* 7:2 register number
*
*/
static
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