diff options
Diffstat (limited to 'arch/ppc/platforms/prpmc750.c')
| -rw-r--r-- | arch/ppc/platforms/prpmc750.c | 364 |
1 files changed, 364 insertions, 0 deletions
diff --git a/arch/ppc/platforms/prpmc750.c b/arch/ppc/platforms/prpmc750.c new file mode 100644 index 0000000..c894e1a --- /dev/null +++ b/arch/ppc/platforms/prpmc750.c @@ -0,0 +1,364 @@ +/* + * arch/ppc/platforms/prpmc750_setup.c + * + * Board setup routines for Motorola PrPMC750 + * + * Author: Matt Porter <mporter@mvista.com> + * + * 2001-2004 (c) MontaVista, Software, Inc. This file is licensed under + * the terms of the GNU General Public License version 2. This program + * is licensed "as is" without any warranty of any kind, whether express + * or implied. + */ + +#include <linux/config.h> +#include <linux/stddef.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/reboot.h> +#include <linux/pci.h> +#include <linux/kdev_t.h> +#include <linux/types.h> +#include <linux/major.h> +#include <linux/initrd.h> +#include <linux/console.h> +#include <linux/delay.h> +#include <linux/irq.h> +#include <linux/seq_file.h> +#include <linux/ide.h> +#include <linux/root_dev.h> +#include <linux/slab.h> + +#include <asm/byteorder.h> +#include <asm/system.h> +#include <asm/pgtable.h> +#include <asm/page.h> +#include <asm/dma.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/machdep.h> +#include <asm/pci-bridge.h> +#include <asm/uaccess.h> +#include <asm/time.h> +#include <asm/open_pic.h> +#include <asm/bootinfo.h> +#include <asm/hawk.h> + +#include "prpmc750.h" + +extern unsigned long loops_per_jiffy; + +extern void gen550_progress(char *, unsigned short); + +static u_char prpmc750_openpic_initsenses[] __initdata = +{ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT0 */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UART */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_DEBUGINT */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HAWK_WDT */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_ABORT */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT1 */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT2 */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT3 */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTA */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTB */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTC */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTD */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */ + (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */ +}; + +/* + * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier + * Combined irq tables. Only Base has IDSEL 14, only Carrier has 21 and 22. + */ +static inline int +prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin) +{ + static char pci_irq_table[][4] = + /* + * PCI IDSEL/INTPIN->INTLINE + * A B C D + */ + { + {12, 0, 0, 0}, /* IDSEL 14 - Ethernet, base */ + {0, 0, 0, 0}, /* IDSEL 15 - unused */ + {10, 11, 12, 9}, /* IDSEL 16 - PMC A1, PMC1 */ + {10, 11, 12, 9}, /* IDSEL 17 - PrPMC-A-B, PMC2-B */ + {11, 12, 9, 10}, /* IDSEL 18 - PMC A1-B, PMC1-B */ + {0, 0, 0, 0}, /* IDSEL 19 - unused */ + {9, 10, 11, 12}, /* IDSEL 20 - P2P Bridge */ + {11, 12, 9, 10}, /* IDSEL 21 - PMC A2, carrier */ + {12, 9, 10, 11}, /* IDSEL 22 - PMC A2-B, carrier */ + }; + const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4; + return PCI_IRQ_TABLE_LOOKUP; +}; + +static void __init prpmc750_pcibios_fixup(void) +{ + struct pci_dev *dev; + unsigned short wtmp; + + /* + * Kludge to clean up after PPC6BUG which doesn't + * configure the CL5446 VGA card. Also the + * resource subsystem doesn't fixup the + * PCI mem resources on the CL5446. + */ + if ((dev = pci_get_device(PCI_VENDOR_ID_CIRRUS, + PCI_DEVICE_ID_CIRRUS_5446, 0))) { + dev->resource[0].start += PRPMC750_PCI_PHY_MEM_OFFSET; + dev->resource[0].end += PRPMC750_PCI_PHY_MEM_OFFSET; + pci_read_config_word(dev, PCI_COMMAND, &wtmp); + pci_write_config_word(dev, PCI_COMMAND, wtmp | 3); + /* Enable Color mode in MISC reg */ + outb(0x03, 0x3c2); + /* Select DRAM config reg */ + outb(0x0f, 0x3c4); + /* Set proper DRAM config */ + outb(0xdf, 0x3c5); + pci_dev_put(dev); + } +} + +void __init prpmc750_find_bridges(void) +{ + struct pci_controller *hose; + + hose = pcibios_alloc_controller(); + if (!hose) + return; + + hose->first_busno = 0; + hose->last_busno = 0xff; + hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE; + hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_OFFSET; + + pci_init_resource(&hose->io_resource, + PRPMC750_PCI_IO_START, + PRPMC750_PCI_IO_END, + IORESOURCE_IO, "PCI host bridge"); + + pci_init_resource(&hose->mem_resources[0], + PRPMC750_PROC_PCI_MEM_START, + PRPMC750_PROC_PCI_MEM_END, + IORESOURCE_MEM, "PCI host bridge"); + + hose->io_space.start = PRPMC750_PCI_IO_START; + hose->io_space.end = PRPMC750_PCI_IO_END; + hose->mem_space.start = PRPMC750_PCI_MEM_START; + hose->mem_space.end = PRPMC750_PCI_MEM_END - HAWK_MPIC_SIZE; + + if (hawk_init(hose, PRPMC750_HAWK_PPC_REG_BASE, + PRPMC750_PROC_PCI_MEM_START, + PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE, + PRPMC750_PROC_PCI_IO_START, PRPMC750_PROC_PCI_IO_END, + PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE + 1) + != 0) { + printk(KERN_CRIT "Could not initialize host bridge\n"); + } + + hose->last_busno = pciauto_bus_scan(hose, hose->first_busno); + + ppc_md.pcibios_fixup = prpmc750_pcibios_fixup; + ppc_md.pci_swizzle = common_swizzle; + ppc_md.pci_map_irq = prpmc_map_irq; +} +static int prpmc750_show_cpuinfo(struct seq_file *m) +{ + seq_printf(m, "machine\t\t: PrPMC750\n"); + + return 0; +} + +static void __init prpmc750_setup_arch(void) +{ + /* init to some ~sane value until calibrate_delay() runs */ + loops_per_jiffy = 50000000 / HZ; + + /* Lookup PCI host bridges */ + prpmc750_find_bridges(); + +#ifdef CONFIG_BLK_DEV_INITRD + if (initrd_start) + ROOT_DEV = Root_RAM0; + else +#endif +#ifdef CONFIG_ROOT_NFS + ROOT_DEV = Root_NFS; +#else + ROOT_DEV = Root_SDA2; +#endif + + OpenPIC_InitSenses = prpmc750_openpic_initsenses; + OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses); + + printk(KERN_INFO "Port by MontaVista Software, Inc. " + "(source@mvista.com)\n"); +} + +/* + * Compute the PrPMC750's bus speed using the baud clock as a + * reference. + */ +static unsigned long __init prpmc750_get_bus_speed(void) +{ + unsigned long tbl_start, tbl_end; + unsigned long current_state, old_state, bus_speed; + unsigned char lcr, dll, dlm; + int baud_divisor, count; + + /* Read the UART's baud clock divisor */ + lcr = readb(PRPMC750_SERIAL_0_LCR); + writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR); + dll = readb(PRPMC750_SERIAL_0_DLL); + dlm = readb(PRPMC750_SERIAL_0_DLM); + writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR); + baud_divisor = (dlm << 8) | dll; + + /* + * Use the baud clock divisor and base baud clock + * to determine the baud rate and use that as + * the number of baud clock edges we use for + * the time base sample. Make it half the baud + * rate. + */ + count = PRPMC750_BASE_BAUD / (baud_divisor * 16); + + /* Find the first edge of the baud clock */ + old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK; + do { + current_state = readb(PRPMC750_STATUS_REG) & + PRPMC750_BAUDOUT_MASK; + } while (old_state == current_state); + + old_state = current_state; + + /* Get the starting time base value */ + tbl_start = get_tbl(); + + /* + * Loop until we have found a number of edges equal + * to half the count (half the baud rate) + */ + do { + do { + current_state = readb(PRPMC750_STATUS_REG) & + PRPMC750_BAUDOUT_MASK; + } while (old_state == current_state); + old_state = current_state; + } while (--count); + + /* Get the ending time base value */ + tbl_end = get_tbl(); + + /* Compute bus speed */ + bus_speed = (tbl_end - tbl_start) * 128; + + return bus_speed; +} + +static void __init prpmc750_calibrate_decr(void) +{ + unsigned long freq; + int divisor = 4; + + freq = prpmc750_get_bus_speed(); + + tb_ticks_per_jiffy = freq / (HZ * divisor); + tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000); +} + +static void prpmc750_restart(char *cmd) +{ + local_irq_disable(); + writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG); + while (1) ; +} + +static void prpmc750_halt(void) +{ + local_irq_disable(); + while (1) ; +} + +static void prpmc750_power_off(void) +{ + prpmc750_halt(); +} + +static void __init prpmc750_init_IRQ(void) +{ + openpic_init(0); +} + +/* + * Set BAT 3 to map 0xf0000000 to end of physical memory space. + */ +static __inline__ void prpmc750_set_bat(void) +{ + mb(); + mtspr(SPRN_DBAT1U, 0xf0001ffe); + mtspr(SPRN_DBAT1L, 0xf000002a); + mb(); +} + +/* + * We need to read the Falcon/Hawk memory controller + * to properly determine this value + */ +static unsigned long __init prpmc750_find_end_of_memory(void) +{ + /* Read the memory size from the Hawk SMC */ + return hawk_get_mem_size(PRPMC750_HAWK_SMC_BASE); +} + +static void __init prpmc750_map_io(void) +{ + io_block_mapping(PRPMC750_ISA_IO_BASE, PRPMC750_ISA_IO_BASE, + 0x10000000, _PAGE_IO); +#if 0 + io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO); +#endif + io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _PAGE_IO); +} + +void __init +platform_init(unsigned long r3, unsigned long r4, unsigned long r5, + unsigned long r6, unsigned long r7) +{ + parse_bootinfo(find_bootinfo()); + + /* Cover the Hawk registers with a BAT */ + prpmc750_set_bat(); + + isa_io_base = PRPMC750_ISA_IO_BASE; + isa_mem_base = PRPMC750_ISA_MEM_BASE; + pci_dram_offset = PRPMC750_PCI_DRAM_OFFSET; + + ppc_md.setup_arch = prpmc750_setup_arch; + ppc_md.show_cpuinfo = prpmc750_show_cpuinfo; + ppc_md.init_IRQ = prpmc750_init_IRQ; + ppc_md.get_irq = openpic_get_irq; + + ppc_md.find_end_of_memory = prpmc750_find_end_of_memory; + ppc_md.setup_io_mappings = prpmc750_map_io; + + ppc_md.restart = prpmc750_restart; + ppc_md.power_off = prpmc750_power_off; + ppc_md.halt = prpmc750_halt; + + /* PrPMC750 has no timekeeper part */ + ppc_md.time_init = NULL; + ppc_md.get_rtc_time = NULL; + ppc_md.set_rtc_time = NULL; + ppc_md.calibrate_decr = prpmc750_calibrate_decr; + +#ifdef CONFIG_SERIAL_TEXT_DEBUG + ppc_md.progress = gen550_progress; +#endif /* CONFIG_SERIAL_TEXT_DEBUG */ +} |