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linux/arch/ppc/syslib/ppc83xx_setup.c
Kumar Gala 66d2cc95d1 [PATCH] ppc32: Added PCI support MPC83xx 
Adds support for the two PCI busses on MPC83xx and the MPC834x SYS/PIBS
reference board.

The code initializes PCI inbound/outbound windows, allocates and registers
PCI memory/io space.  Be aware that setup of the PCI buses on the PIBs
board is expected to be done by the firmware.

Signed-off-by: Tony Li <tony.li@freescale.com>
Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-05 00:05:59 -07:00

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/*
* arch/ppc/syslib/ppc83xx_setup.c
*
* MPC83XX common board code
*
* Maintainer: Kumar Gala <kumar.gala@freescale.com>
*
* Copyright 2005 Freescale Semiconductor Inc.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Added PCI support -- Tony Li <tony.li@freescale.com>
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/serial.h>
#include <linux/tty.h> /* for linux/serial_core.h */
#include <linux/serial_core.h>
#include <linux/serial_8250.h>
#include <asm/time.h>
#include <asm/mpc83xx.h>
#include <asm/mmu.h>
#include <asm/ppc_sys.h>
#include <asm/kgdb.h>
#include <asm/delay.h>
#include <syslib/ppc83xx_setup.h>
#if defined(CONFIG_PCI)
#include <asm/delay.h>
#include <syslib/ppc83xx_pci.h>
#endif
phys_addr_t immrbar;
/* Return the amount of memory */
unsigned long __init
mpc83xx_find_end_of_memory(void)
{
bd_t *binfo;
binfo = (bd_t *) __res;
return binfo->bi_memsize;
}
long __init
mpc83xx_time_init(void)
{
#define SPCR_OFFS 0x00000110
#define SPCR_TBEN 0x00400000
bd_t *binfo = (bd_t *)__res;
u32 *spcr = ioremap(binfo->bi_immr_base + SPCR_OFFS, 4);
*spcr |= SPCR_TBEN;
iounmap(spcr);
return 0;
}
/* The decrementer counts at the system (internal) clock freq divided by 4 */
void __init
mpc83xx_calibrate_decr(void)
{
bd_t *binfo = (bd_t *) __res;
unsigned int freq, divisor;
freq = binfo->bi_busfreq;
divisor = 4;
tb_ticks_per_jiffy = freq / HZ / divisor;
tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
}
#ifdef CONFIG_SERIAL_8250
void __init
mpc83xx_early_serial_map(void)
{
#if defined(CONFIG_SERIAL_TEXT_DEBUG) || defined(CONFIG_KGDB)
struct uart_port serial_req;
#endif
struct plat_serial8250_port *pdata;
bd_t *binfo = (bd_t *) __res;
pdata = (struct plat_serial8250_port *) ppc_sys_get_pdata(MPC83xx_DUART);
/* Setup serial port access */
pdata[0].uartclk = binfo->bi_busfreq;
pdata[0].mapbase += binfo->bi_immr_base;
pdata[0].membase = ioremap(pdata[0].mapbase, 0x100);
#if defined(CONFIG_SERIAL_TEXT_DEBUG) || defined(CONFIG_KGDB)
memset(&serial_req, 0, sizeof (serial_req));
serial_req.iotype = SERIAL_IO_MEM;
serial_req.mapbase = pdata[0].mapbase;
serial_req.membase = pdata[0].membase;
serial_req.regshift = 0;
gen550_init(0, &serial_req);
#endif
pdata[1].uartclk = binfo->bi_busfreq;
pdata[1].mapbase += binfo->bi_immr_base;
pdata[1].membase = ioremap(pdata[1].mapbase, 0x100);
#if defined(CONFIG_SERIAL_TEXT_DEBUG) || defined(CONFIG_KGDB)
/* Assume gen550_init() doesn't modify serial_req */
serial_req.mapbase = pdata[1].mapbase;
serial_req.membase = pdata[1].membase;
gen550_init(1, &serial_req);
#endif
}
#endif
void
mpc83xx_restart(char *cmd)
{
volatile unsigned char __iomem *reg;
unsigned char tmp;
reg = ioremap(BCSR_PHYS_ADDR, BCSR_SIZE);
local_irq_disable();
/*
* Unlock the BCSR bits so a PRST will update the contents.
* Otherwise the reset asserts but doesn't clear.
*/
tmp = in_8(reg + BCSR_MISC_REG3_OFF);
tmp |= BCSR_MISC_REG3_CNFLOCK; /* low true, high false */
out_8(reg + BCSR_MISC_REG3_OFF, tmp);
/*
* Trigger a reset via a low->high transition of the
* PORESET bit.
*/
tmp = in_8(reg + BCSR_MISC_REG2_OFF);
tmp &= ~BCSR_MISC_REG2_PORESET;
out_8(reg + BCSR_MISC_REG2_OFF, tmp);
udelay(1);
tmp |= BCSR_MISC_REG2_PORESET;
out_8(reg + BCSR_MISC_REG2_OFF, tmp);
for(;;);
}
void
mpc83xx_power_off(void)
{
local_irq_disable();
for(;;);
}
void
mpc83xx_halt(void)
{
local_irq_disable();
for(;;);
}
#if defined(CONFIG_PCI)
void __init
mpc83xx_setup_pci1(struct pci_controller *hose)
{
u16 reg16;
volatile immr_pcictrl_t * pci_ctrl;
volatile immr_ios_t * ios;
bd_t *binfo = (bd_t *) __res;
pci_ctrl = ioremap(binfo->bi_immr_base + 0x8500, sizeof(immr_pcictrl_t));
ios = ioremap(binfo->bi_immr_base + 0x8400, sizeof(immr_ios_t));
/*
* Configure PCI Outbound Translation Windows
*/
ios->potar0 = (MPC83xx_PCI1_LOWER_MEM >> 12) & POTAR_TA_MASK;
ios->pobar0 = (MPC83xx_PCI1_LOWER_MEM >> 12) & POBAR_BA_MASK;
ios->pocmr0 = POCMR_EN |
(((0xffffffff - (MPC83xx_PCI1_UPPER_MEM -
MPC83xx_PCI1_LOWER_MEM)) >> 12) & POCMR_CM_MASK);
/* mapped to PCI1 IO space */
ios->potar1 = (MPC83xx_PCI1_LOWER_IO >> 12) & POTAR_TA_MASK;
ios->pobar1 = (MPC83xx_PCI1_IO_BASE >> 12) & POBAR_BA_MASK;
ios->pocmr1 = POCMR_EN | POCMR_IO |
(((0xffffffff - (MPC83xx_PCI1_UPPER_IO -
MPC83xx_PCI1_LOWER_IO)) >> 12) & POCMR_CM_MASK);
/*
* Configure PCI Inbound Translation Windows
*/
pci_ctrl->pitar1 = 0x0;
pci_ctrl->pibar1 = 0x0;
pci_ctrl->piebar1 = 0x0;
pci_ctrl->piwar1 = PIWAR_EN | PIWAR_PF | PIWAR_RTT_SNOOP | PIWAR_WTT_SNOOP | PIWAR_IWS_2G;
/*
* Release PCI RST signal
*/
pci_ctrl->gcr = 0;
udelay(2000);
pci_ctrl->gcr = 1;
udelay(2000);
reg16 = 0xff;
early_read_config_word(hose, hose->first_busno, 0, PCI_COMMAND, &reg16);
reg16 |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
early_write_config_word(hose, hose->first_busno, 0, PCI_COMMAND, reg16);
/*
* Clear non-reserved bits in status register.
*/
early_write_config_word(hose, hose->first_busno, 0, PCI_STATUS, 0xffff);
early_write_config_byte(hose, hose->first_busno, 0, PCI_LATENCY_TIMER, 0x80);
iounmap(pci_ctrl);
iounmap(ios);
}
void __init
mpc83xx_setup_pci2(struct pci_controller *hose)
{
u16 reg16;
volatile immr_pcictrl_t * pci_ctrl;
volatile immr_ios_t * ios;
bd_t *binfo = (bd_t *) __res;
pci_ctrl = ioremap(binfo->bi_immr_base + 0x8600, sizeof(immr_pcictrl_t));
ios = ioremap(binfo->bi_immr_base + 0x8400, sizeof(immr_ios_t));
/*
* Configure PCI Outbound Translation Windows
*/
ios->potar3 = (MPC83xx_PCI2_LOWER_MEM >> 12) & POTAR_TA_MASK;
ios->pobar3 = (MPC83xx_PCI2_LOWER_MEM >> 12) & POBAR_BA_MASK;
ios->pocmr3 = POCMR_EN | POCMR_DST |
(((0xffffffff - (MPC83xx_PCI2_UPPER_MEM -
MPC83xx_PCI2_LOWER_MEM)) >> 12) & POCMR_CM_MASK);
/* mapped to PCI2 IO space */
ios->potar4 = (MPC83xx_PCI2_LOWER_IO >> 12) & POTAR_TA_MASK;
ios->pobar4 = (MPC83xx_PCI2_IO_BASE >> 12) & POBAR_BA_MASK;
ios->pocmr4 = POCMR_EN | POCMR_DST | POCMR_IO |
(((0xffffffff - (MPC83xx_PCI2_UPPER_IO -
MPC83xx_PCI2_LOWER_IO)) >> 12) & POCMR_CM_MASK);
/*
* Configure PCI Inbound Translation Windows
*/
pci_ctrl->pitar1 = 0x0;
pci_ctrl->pibar1 = 0x0;
pci_ctrl->piebar1 = 0x0;
pci_ctrl->piwar1 = PIWAR_EN | PIWAR_PF | PIWAR_RTT_SNOOP | PIWAR_WTT_SNOOP | PIWAR_IWS_2G;
/*
* Release PCI RST signal
*/
pci_ctrl->gcr = 0;
udelay(2000);
pci_ctrl->gcr = 1;
udelay(2000);
reg16 = 0xff;
early_read_config_word(hose, hose->first_busno, 0, PCI_COMMAND, &reg16);
reg16 |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
early_write_config_word(hose, hose->first_busno, 0, PCI_COMMAND, reg16);
/*
* Clear non-reserved bits in status register.
*/
early_write_config_word(hose, hose->first_busno, 0, PCI_STATUS, 0xffff);
early_write_config_byte(hose, hose->first_busno, 0, PCI_LATENCY_TIMER, 0x80);
iounmap(pci_ctrl);
iounmap(ios);
}
/*
* PCI buses can be enabled only if SYS board combinates with PIB
* (Platform IO Board) board which provide 3 PCI slots. There is 2 PCI buses
* and 3 PCI slots, so people must configure the routes between them before
* enable PCI bus. This routes are under the control of PCA9555PW device which
* can be accessed via I2C bus 2 and are configured by firmware. Refer to
* Freescale to get more information about firmware configuration.
*/
extern int mpc83xx_exclude_device(u_char bus, u_char devfn);
extern int mpc83xx_map_irq(struct pci_dev *dev, unsigned char idsel,
unsigned char pin);
void __init
mpc83xx_setup_hose(void)
{
u32 val32;
volatile immr_clk_t * clk;
struct pci_controller * hose1;
#ifdef CONFIG_MPC83xx_PCI2
struct pci_controller * hose2;
#endif
bd_t * binfo = (bd_t *)__res;
clk = ioremap(binfo->bi_immr_base + 0xA00,
sizeof(immr_clk_t));
/*
* Configure PCI controller and PCI_CLK_OUTPUT both in 66M mode
*/
val32 = clk->occr;
udelay(2000);
clk->occr = 0xff000000;
udelay(2000);
iounmap(clk);
hose1 = pcibios_alloc_controller();
if(!hose1)
return;
ppc_md.pci_swizzle = common_swizzle;
ppc_md.pci_map_irq = mpc83xx_map_irq;
hose1->bus_offset = 0;
hose1->first_busno = 0;
hose1->last_busno = 0xff;
setup_indirect_pci(hose1, binfo->bi_immr_base + PCI1_CFG_ADDR_OFFSET,
binfo->bi_immr_base + PCI1_CFG_DATA_OFFSET);
hose1->set_cfg_type = 1;
mpc83xx_setup_pci1(hose1);
hose1->pci_mem_offset = MPC83xx_PCI1_MEM_OFFSET;
hose1->mem_space.start = MPC83xx_PCI1_LOWER_MEM;
hose1->mem_space.end = MPC83xx_PCI1_UPPER_MEM;
hose1->io_base_phys = MPC83xx_PCI1_IO_BASE;
hose1->io_space.start = MPC83xx_PCI1_LOWER_IO;
hose1->io_space.end = MPC83xx_PCI1_UPPER_IO;
#ifdef CONFIG_MPC83xx_PCI2
isa_io_base = (unsigned long)ioremap(MPC83xx_PCI1_IO_BASE,
MPC83xx_PCI1_IO_SIZE + MPC83xx_PCI2_IO_SIZE);
#else
isa_io_base = (unsigned long)ioremap(MPC83xx_PCI1_IO_BASE,
MPC83xx_PCI1_IO_SIZE);
#endif /* CONFIG_MPC83xx_PCI2 */
hose1->io_base_virt = (void *)isa_io_base;
/* setup resources */
pci_init_resource(&hose1->io_resource,
MPC83xx_PCI1_LOWER_IO,
MPC83xx_PCI1_UPPER_IO,
IORESOURCE_IO, "PCI host bridge 1");
pci_init_resource(&hose1->mem_resources[0],
MPC83xx_PCI1_LOWER_MEM,
MPC83xx_PCI1_UPPER_MEM,
IORESOURCE_MEM, "PCI host bridge 1");
ppc_md.pci_exclude_device = mpc83xx_exclude_device;
hose1->last_busno = pciauto_bus_scan(hose1, hose1->first_busno);
#ifdef CONFIG_MPC83xx_PCI2
hose2 = pcibios_alloc_controller();
if(!hose2)
return;
hose2->bus_offset = hose1->last_busno + 1;
hose2->first_busno = hose1->last_busno + 1;
hose2->last_busno = 0xff;
setup_indirect_pci(hose2, binfo->bi_immr_base + PCI2_CFG_ADDR_OFFSET,
binfo->bi_immr_base + PCI2_CFG_DATA_OFFSET);
hose2->set_cfg_type = 1;
mpc83xx_setup_pci2(hose2);
hose2->pci_mem_offset = MPC83xx_PCI2_MEM_OFFSET;
hose2->mem_space.start = MPC83xx_PCI2_LOWER_MEM;
hose2->mem_space.end = MPC83xx_PCI2_UPPER_MEM;
hose2->io_base_phys = MPC83xx_PCI2_IO_BASE;
hose2->io_space.start = MPC83xx_PCI2_LOWER_IO;
hose2->io_space.end = MPC83xx_PCI2_UPPER_IO;
hose2->io_base_virt = (void *)(isa_io_base + MPC83xx_PCI1_IO_SIZE);
/* setup resources */
pci_init_resource(&hose2->io_resource,
MPC83xx_PCI2_LOWER_IO,
MPC83xx_PCI2_UPPER_IO,
IORESOURCE_IO, "PCI host bridge 2");
pci_init_resource(&hose2->mem_resources[0],
MPC83xx_PCI2_LOWER_MEM,
MPC83xx_PCI2_UPPER_MEM,
IORESOURCE_MEM, "PCI host bridge 2");
hose2->last_busno = pciauto_bus_scan(hose2, hose2->first_busno);
#endif /* CONFIG_MPC83xx_PCI2 */
}
#endif /*CONFIG_PCI*/
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