[mirror_ubuntu-jammy-kernel.git] / arch / ppc / platforms / prpmc750.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/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/seq_file.h>
#include <linux/root_dev.h>
#include <linux/slab.h>
#include <linux/serial_reg.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 */
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Board setup routines for Motorola PrPMC750
	3	*
	4	* Author: Matt Porter <mporter@mvista.com>
	5	*
	6	* 2001-2004 (c) MontaVista, Software, Inc. This file is licensed under
	7	* the terms of the GNU General Public License version 2. This program
	8	* is licensed "as is" without any warranty of any kind, whether express
	9	* or implied.
	10	*/
	11
1da177e4 LT	12	#include <linux/stddef.h>
	13	#include <linux/kernel.h>
	14	#include <linux/init.h>
	15	#include <linux/errno.h>
	16	#include <linux/reboot.h>
	17	#include <linux/pci.h>
	18	#include <linux/kdev_t.h>
	19	#include <linux/types.h>
	20	#include <linux/major.h>
	21	#include <linux/initrd.h>
	22	#include <linux/console.h>
	23	#include <linux/delay.h>
1da177e4	24	#include <linux/seq_file.h>
1da177e4 LT	25	#include <linux/root_dev.h>
1da177e4 LT	26	#include <linux/slab.h>
571e63fc	27	#include <linux/serial_reg.h>
1da177e4 LT	28
	29	#include <asm/byteorder.h>
	30	#include <asm/system.h>
	31	#include <asm/pgtable.h>
	32	#include <asm/page.h>
	33	#include <asm/dma.h>
	34	#include <asm/io.h>
	35	#include <asm/irq.h>
	36	#include <asm/machdep.h>
	37	#include <asm/pci-bridge.h>
	38	#include <asm/uaccess.h>
	39	#include <asm/time.h>
	40	#include <asm/open_pic.h>
	41	#include <asm/bootinfo.h>
	42	#include <asm/hawk.h>
	43
	44	#include "prpmc750.h"
	45
	46	extern unsigned long loops_per_jiffy;
	47
	48	extern void gen550_progress(char *, unsigned short);
	49
	50	static u_char prpmc750_openpic_initsenses[] __initdata =
	51	{
	52	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT0 */
	53	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UART */
	54	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_DEBUGINT */
	55	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HAWK_WDT */
	56	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
	57	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_ABORT */
	58	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT1 */
	59	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT2 */
	60	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT3 */
	61	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTA */
	62	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTB */
	63	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTC */
	64	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTD */
	65	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
	66	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
	67	(IRQ_SENSE_LEVEL \| IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
	68	};
	69
	70	/*
	71	* Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
	72	* Combined irq tables. Only Base has IDSEL 14, only Carrier has 21 and 22.
	73	*/
	74	static inline int
	75	prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
	76	{
	77	static char pci_irq_table[][4] =
	78	/*
	79	* PCI IDSEL/INTPIN->INTLINE
	80	* A B C D
	81	*/
	82	{
	83	{12, 0, 0, 0}, /* IDSEL 14 - Ethernet, base */
	84	{0, 0, 0, 0}, /* IDSEL 15 - unused */
	85	{10, 11, 12, 9}, /* IDSEL 16 - PMC A1, PMC1 */
	86	{10, 11, 12, 9}, /* IDSEL 17 - PrPMC-A-B, PMC2-B */
	87	{11, 12, 9, 10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
	88	{0, 0, 0, 0}, /* IDSEL 19 - unused */
	89	{9, 10, 11, 12}, /* IDSEL 20 - P2P Bridge */
	90	{11, 12, 9, 10}, /* IDSEL 21 - PMC A2, carrier */
	91	{12, 9, 10, 11}, /* IDSEL 22 - PMC A2-B, carrier */
92	};
93	const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
94	return PCI_IRQ_TABLE_LOOKUP;
95	};
96
97	static void __init prpmc750_pcibios_fixup(void)
98	{
99	struct pci_dev *dev;
100	unsigned short wtmp;
101
102	/*
103	* Kludge to clean up after PPC6BUG which doesn't
104	* configure the CL5446 VGA card. Also the
105	* resource subsystem doesn't fixup the
106	* PCI mem resources on the CL5446.
107	*/
108	if ((dev = pci_get_device(PCI_VENDOR_ID_CIRRUS,
109	PCI_DEVICE_ID_CIRRUS_5446, 0))) {
110	dev->resource[0].start += PRPMC750_PCI_PHY_MEM_OFFSET;
111	dev->resource[0].end += PRPMC750_PCI_PHY_MEM_OFFSET;
112	pci_read_config_word(dev, PCI_COMMAND, &wtmp);
113	pci_write_config_word(dev, PCI_COMMAND, wtmp \| 3);
114	/* Enable Color mode in MISC reg */
115	outb(0x03, 0x3c2);
116	/* Select DRAM config reg */
117	outb(0x0f, 0x3c4);
118	/* Set proper DRAM config */
119	outb(0xdf, 0x3c5);
120	pci_dev_put(dev);
121	}
122	}
123
124	void __init prpmc750_find_bridges(void)
125	{
126	struct pci_controller *hose;
127
128	hose = pcibios_alloc_controller();
129	if (!hose)
130	return;
131
132	hose->first_busno = 0;
133	hose->last_busno = 0xff;
134	hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE;
135	hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_OFFSET;
136
137	pci_init_resource(&hose->io_resource,
138	PRPMC750_PCI_IO_START,
139	PRPMC750_PCI_IO_END,
140	IORESOURCE_IO, "PCI host bridge");
141
142	pci_init_resource(&hose->mem_resources[0],
143	PRPMC750_PROC_PCI_MEM_START,
144	PRPMC750_PROC_PCI_MEM_END,
145	IORESOURCE_MEM, "PCI host bridge");
146
147	hose->io_space.start = PRPMC750_PCI_IO_START;
148	hose->io_space.end = PRPMC750_PCI_IO_END;
149	hose->mem_space.start = PRPMC750_PCI_MEM_START;
150	hose->mem_space.end = PRPMC750_PCI_MEM_END - HAWK_MPIC_SIZE;
151
152	if (hawk_init(hose, PRPMC750_HAWK_PPC_REG_BASE,
153	PRPMC750_PROC_PCI_MEM_START,
154	PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE,
155	PRPMC750_PROC_PCI_IO_START, PRPMC750_PROC_PCI_IO_END,
156	PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE + 1)
157	!= 0) {
158	printk(KERN_CRIT "Could not initialize host bridge\n");
159	}
160
161	hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
162
163	ppc_md.pcibios_fixup = prpmc750_pcibios_fixup;
164	ppc_md.pci_swizzle = common_swizzle;
165	ppc_md.pci_map_irq = prpmc_map_irq;
166	}
167	static int prpmc750_show_cpuinfo(struct seq_file *m)
168	{
169	seq_printf(m, "machine\t\t: PrPMC750\n");
170
171	return 0;
172	}
173
174	static void __init prpmc750_setup_arch(void)
175	{
176	/* init to some ~sane value until calibrate_delay() runs */
177	loops_per_jiffy = 50000000 / HZ;
178
179	/* Lookup PCI host bridges */
180	prpmc750_find_bridges();
181
182	#ifdef CONFIG_BLK_DEV_INITRD
183	if (initrd_start)
184	ROOT_DEV = Root_RAM0;
185	else
186	#endif
187	#ifdef CONFIG_ROOT_NFS
188	ROOT_DEV = Root_NFS;
189	#else
190	ROOT_DEV = Root_SDA2;
191	#endif
192
193	OpenPIC_InitSenses = prpmc750_openpic_initsenses;
194	OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses);
195
196	printk(KERN_INFO "Port by MontaVista Software, Inc. "
197	"(source@mvista.com)\n");
198	}
199
200	/*
201	* Compute the PrPMC750's bus speed using the baud clock as a
202	* reference.
203	*/
204	static unsigned long __init prpmc750_get_bus_speed(void)
205	{
206	unsigned long tbl_start, tbl_end;
207	unsigned long current_state, old_state, bus_speed;
208	unsigned char lcr, dll, dlm;
209	int baud_divisor, count;
210
211	/* Read the UART's baud clock divisor */
212	lcr = readb(PRPMC750_SERIAL_0_LCR);
213	writeb(lcr \| UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
214	dll = readb(PRPMC750_SERIAL_0_DLL);
215	dlm = readb(PRPMC750_SERIAL_0_DLM);
216	writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
217	baud_divisor = (dlm << 8) \| dll;
218
219	/*
220	* Use the baud clock divisor and base baud clock
221	* to determine the baud rate and use that as
222	* the number of baud clock edges we use for
223	* the time base sample. Make it half the baud
224	* rate.
225	*/
226	count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
227
228	/* Find the first edge of the baud clock */
229	old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
230	do {
231	current_state = readb(PRPMC750_STATUS_REG) &
232	PRPMC750_BAUDOUT_MASK;
233	} while (old_state == current_state);
234
235	old_state = current_state;
236
237	/* Get the starting time base value */
238	tbl_start = get_tbl();
239
240	/*
241	* Loop until we have found a number of edges equal
242	* to half the count (half the baud rate)
243	*/
244	do {
245	do {
246	current_state = readb(PRPMC750_STATUS_REG) &
247	PRPMC750_BAUDOUT_MASK;
248	} while (old_state == current_state);
249	old_state = current_state;
250	} while (--count);
251
252	/* Get the ending time base value */
253	tbl_end = get_tbl();
254
255	/* Compute bus speed */
256	bus_speed = (tbl_end - tbl_start) * 128;
257
258	return bus_speed;
259	}
260
261	static void __init prpmc750_calibrate_decr(void)
262	{
263	unsigned long freq;
264	int divisor = 4;
265
266	freq = prpmc750_get_bus_speed();
267
268	tb_ticks_per_jiffy = freq / (HZ * divisor);
269	tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
270	}
271
272	static void prpmc750_restart(char *cmd)
273	{
274	local_irq_disable();
275	writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
276	while (1) ;
277	}
278
279	static void prpmc750_halt(void)
280	{
281	local_irq_disable();
282	while (1) ;
283	}
284
285	static void prpmc750_power_off(void)
286	{
287	prpmc750_halt();
288	}
289
290	static void __init prpmc750_init_IRQ(void)
291	{
292	openpic_init(0);
293	}
294
295	/*
296	* Set BAT 3 to map 0xf0000000 to end of physical memory space.
297	*/
298	static __inline__ void prpmc750_set_bat(void)
299	{
300	mb();
301	mtspr(SPRN_DBAT1U, 0xf0001ffe);
302	mtspr(SPRN_DBAT1L, 0xf000002a);
303	mb();
304	}
305
306	/*
307	* We need to read the Falcon/Hawk memory controller
308	* to properly determine this value
309	*/
310	static unsigned long __init prpmc750_find_end_of_memory(void)
311	{
312	/* Read the memory size from the Hawk SMC */
313	return hawk_get_mem_size(PRPMC750_HAWK_SMC_BASE);
314	}
315
316	static void __init prpmc750_map_io(void)
317	{
318	io_block_mapping(PRPMC750_ISA_IO_BASE, PRPMC750_ISA_IO_BASE,
319	0x10000000, _PAGE_IO);
320	#if 0
321	io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO);
322	#endif
323	io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _PAGE_IO);
324	}
325
326	void __init
327	platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
328	unsigned long r6, unsigned long r7)
329	{
330	parse_bootinfo(find_bootinfo());
331
332	/* Cover the Hawk registers with a BAT */
333	prpmc750_set_bat();
334
335	isa_io_base = PRPMC750_ISA_IO_BASE;
336	isa_mem_base = PRPMC750_ISA_MEM_BASE;
337	pci_dram_offset = PRPMC750_PCI_DRAM_OFFSET;
338
339	ppc_md.setup_arch = prpmc750_setup_arch;
340	ppc_md.show_cpuinfo = prpmc750_show_cpuinfo;
341	ppc_md.init_IRQ = prpmc750_init_IRQ;
342	ppc_md.get_irq = openpic_get_irq;
343
344	ppc_md.find_end_of_memory = prpmc750_find_end_of_memory;
345	ppc_md.setup_io_mappings = prpmc750_map_io;
346
347	ppc_md.restart = prpmc750_restart;
348	ppc_md.power_off = prpmc750_power_off;
349	ppc_md.halt = prpmc750_halt;
350
351	/* PrPMC750 has no timekeeper part */
352	ppc_md.time_init = NULL;
353	ppc_md.get_rtc_time = NULL;
354	ppc_md.set_rtc_time = NULL;
355	ppc_md.calibrate_decr = prpmc750_calibrate_decr;
356
357	#ifdef CONFIG_SERIAL_TEXT_DEBUG
358	ppc_md.progress = gen550_progress;
359	#endif /* CONFIG_SERIAL_TEXT_DEBUG */
360	}