[mirror_ubuntu-focal-kernel.git] / arch / powerpc / kernel / rtas_pci.c

/*
 * Copyright (C) 2001 Dave Engebretsen, IBM Corporation
 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
 *
 * RTAS specific routines for PCI.
 *
 * Based on code from pci.c, chrp_pci.c and pSeries_pci.c
 *
 * 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/threads.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/init.h>

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/pci-bridge.h>
#include <asm/iommu.h>
#include <asm/rtas.h>
#include <asm/mpic.h>
#include <asm/ppc-pci.h>
#include <asm/eeh.h>

/* RTAS tokens */
static int read_pci_config;
static int write_pci_config;
static int ibm_read_pci_config;
static int ibm_write_pci_config;

static inline int config_access_valid(struct pci_dn *dn, int where)
{
	if (where < 256)
		return 1;
	if (where < 4096 && dn->pci_ext_config_space)
		return 1;

	return 0;
}

int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val)
{
	int returnval = -1;
	unsigned long buid, addr;
	int ret;

	if (!pdn)
		return PCIBIOS_DEVICE_NOT_FOUND;
	if (!config_access_valid(pdn, where))
		return PCIBIOS_BAD_REGISTER_NUMBER;
#ifdef CONFIG_EEH
	if (pdn->edev && pdn->edev->pe &&
	    (pdn->edev->pe->state & EEH_PE_CFG_BLOCKED))
		return PCIBIOS_SET_FAILED;
#endif

	addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
	buid = pdn->phb->buid;
	if (buid) {
		ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
				addr, BUID_HI(buid), BUID_LO(buid), size);
	} else {
		ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
	}
	*val = returnval;

	if (ret)
		return PCIBIOS_DEVICE_NOT_FOUND;

	return PCIBIOS_SUCCESSFUL;
}

static int rtas_pci_read_config(struct pci_bus *bus,
				unsigned int devfn,
				int where, int size, u32 *val)
{
	struct pci_dn *pdn;
	int ret;

	*val = 0xFFFFFFFF;

	pdn = pci_get_pdn_by_devfn(bus, devfn);

	/* Validity of pdn is checked in here */
	ret = rtas_read_config(pdn, where, size, val);
	if (*val == EEH_IO_ERROR_VALUE(size) &&
	    eeh_dev_check_failure(pdn_to_eeh_dev(pdn)))
		return PCIBIOS_DEVICE_NOT_FOUND;

	return ret;
}

int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val)
{
	unsigned long buid, addr;
	int ret;

	if (!pdn)
		return PCIBIOS_DEVICE_NOT_FOUND;
	if (!config_access_valid(pdn, where))
		return PCIBIOS_BAD_REGISTER_NUMBER;
#ifdef CONFIG_EEH
	if (pdn->edev && pdn->edev->pe &&
	    (pdn->edev->pe->state & EEH_PE_CFG_BLOCKED))
		return PCIBIOS_SET_FAILED;
#endif

	addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
	buid = pdn->phb->buid;
	if (buid) {
		ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr,
			BUID_HI(buid), BUID_LO(buid), size, (ulong) val);
	} else {
		ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
	}

	if (ret)
		return PCIBIOS_DEVICE_NOT_FOUND;

	return PCIBIOS_SUCCESSFUL;
}

static int rtas_pci_write_config(struct pci_bus *bus,
				 unsigned int devfn,
				 int where, int size, u32 val)
{
	struct pci_dn *pdn;

	pdn = pci_get_pdn_by_devfn(bus, devfn);

	/* Validity of pdn is checked in here. */
	return rtas_write_config(pdn, where, size, val);
}

static struct pci_ops rtas_pci_ops = {
	.read = rtas_pci_read_config,
	.write = rtas_pci_write_config,
};

static int is_python(struct device_node *dev)
{
	const char *model = of_get_property(dev, "model", NULL);

	if (model && strstr(model, "Python"))
		return 1;

	return 0;
}

static void python_countermeasures(struct device_node *dev)
{
	struct resource registers;
	void __iomem *chip_regs;
	volatile u32 val;

	if (of_address_to_resource(dev, 0, &registers)) {
		printk(KERN_ERR "Can't get address for Python workarounds !\n");
		return;
	}

	/* Python's register file is 1 MB in size. */
	chip_regs = ioremap(registers.start & ~(0xfffffUL), 0x100000);

	/*
	 * Firmware doesn't always clear this bit which is critical
	 * for good performance - Anton
	 */

#define PRG_CL_RESET_VALID 0x00010000

	val = in_be32(chip_regs + 0xf6030);
	if (val & PRG_CL_RESET_VALID) {
		printk(KERN_INFO "Python workaround: ");
		val &= ~PRG_CL_RESET_VALID;
		out_be32(chip_regs + 0xf6030, val);
		/*
		 * We must read it back for changes to
		 * take effect
		 */
		val = in_be32(chip_regs + 0xf6030);
		printk("reg0: %x\n", val);
	}

	iounmap(chip_regs);
}

void __init init_pci_config_tokens(void)
{
	read_pci_config = rtas_token("read-pci-config");
	write_pci_config = rtas_token("write-pci-config");
	ibm_read_pci_config = rtas_token("ibm,read-pci-config");
	ibm_write_pci_config = rtas_token("ibm,write-pci-config");
}

unsigned long get_phb_buid(struct device_node *phb)
{
	struct resource r;

	if (ibm_read_pci_config == -1)
		return 0;
	if (of_address_to_resource(phb, 0, &r))
		return 0;
	return r.start;
}

static int phb_set_bus_ranges(struct device_node *dev,
			      struct pci_controller *phb)
{
	const __be32 *bus_range;
	unsigned int len;

	bus_range = of_get_property(dev, "bus-range", &len);
	if (bus_range == NULL || len < 2 * sizeof(int)) {
		return 1;
 	}

	phb->first_busno = be32_to_cpu(bus_range[0]);
	phb->last_busno  = be32_to_cpu(bus_range[1]);

	return 0;
}

int rtas_setup_phb(struct pci_controller *phb)
{
	struct device_node *dev = phb->dn;

	if (is_python(dev))
		python_countermeasures(dev);

	if (phb_set_bus_ranges(dev, phb))
		return 1;

	phb->ops = &rtas_pci_ops;
	phb->buid = get_phb_buid(dev);

	return 0;
}
Commit	Line	Data
c5a3c2e5	1	/*
c5a3c2e5 AB	2	* Copyright (C) 2001 Dave Engebretsen, IBM Corporation
	3	* Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
	4	*
	5	* RTAS specific routines for PCI.
ae65a391	6	*
c5a3c2e5 AB	7	* Based on code from pci.c, chrp_pci.c and pSeries_pci.c
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
ae65a391	13	*
c5a3c2e5 AB	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
ae65a391	18	*
c5a3c2e5 AB	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	22	*/
	23
	24	#include <linux/kernel.h>
	25	#include <linux/threads.h>
	26	#include <linux/pci.h>
	27	#include <linux/string.h>
	28	#include <linux/init.h>
c5a3c2e5 AB	29
	30	#include <asm/io.h>
	31	#include <asm/pgtable.h>
	32	#include <asm/irq.h>
	33	#include <asm/prom.h>
	34	#include <asm/machdep.h>
	35	#include <asm/pci-bridge.h>
	36	#include <asm/iommu.h>
	37	#include <asm/rtas.h>
bbeb3f4c	38	#include <asm/mpic.h>
d387899f	39	#include <asm/ppc-pci.h>
68a64357	40	#include <asm/eeh.h>
c5a3c2e5 AB	41
	42	/* RTAS tokens */
	43	static int read_pci_config;
	44	static int write_pci_config;
	45	static int ibm_read_pci_config;
	46	static int ibm_write_pci_config;
	47
ae65a391	48	static inline int config_access_valid(struct pci_dn *dn, int where)
c5a3c2e5 AB	49	{
	50	if (where < 256)
	51	return 1;
	52	if (where < 4096 && dn->pci_ext_config_space)
	53	return 1;
	54
	55	return 0;
	56	}
	57
7684b40c	58	int rtas_read_config(struct pci_dn pdn, int where, int size, u32 val)
c5a3c2e5 AB	59	{
	60	int returnval = -1;
	61	unsigned long buid, addr;
	62	int ret;
	63
ae65a391	64	if (!pdn)
c5a3c2e5	65	return PCIBIOS_DEVICE_NOT_FOUND;
1635317f	66	if (!config_access_valid(pdn, where))
c5a3c2e5	67	return PCIBIOS_BAD_REGISTER_NUMBER;
3409eb4e GS	68	#ifdef CONFIG_EEH
	69	if (pdn->edev && pdn->edev->pe &&
	70	(pdn->edev->pe->state & EEH_PE_CFG_BLOCKED))
	71	return PCIBIOS_SET_FAILED;
	72	#endif
c5a3c2e5	73
6f3d5d3c	74	addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
1635317f	75	buid = pdn->phb->buid;
c5a3c2e5 AB	76	if (buid) {
c5a3c2e5 AB	77	ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
ae65a391	78	addr, BUID_HI(buid), BUID_LO(buid), size);
c5a3c2e5 AB	79	} else {
	80	ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
	81	}
	82	*val = returnval;
	83
	84	if (ret)
	85	return PCIBIOS_DEVICE_NOT_FOUND;
	86
c5a3c2e5 AB	87	return PCIBIOS_SUCCESSFUL;
	88	}
	89
	90	static int rtas_pci_read_config(struct pci_bus *bus,
	91	unsigned int devfn,
	92	int where, int size, u32 *val)
	93	{
d0914f50	94	struct pci_dn *pdn;
d0914f50	95	int ret;
c5a3c2e5	96
d0914f50	97	*val = 0xFFFFFFFF;
1635317f	98
f9df74df	99	pdn = pci_get_pdn_by_devfn(bus, devfn);
d0914f50	100
f9df74df	101	/* Validity of pdn is checked in here */
d0914f50 GS	102	ret = rtas_read_config(pdn, where, size, val);
d0914f50 GS	103	if (*val == EEH_IO_ERROR_VALUE(size) &&
c6406d8f	104	eeh_dev_check_failure(pdn_to_eeh_dev(pdn)))
d0914f50 GS	105	return PCIBIOS_DEVICE_NOT_FOUND;
	106
	107	return ret;
c5a3c2e5 AB	108	}
c5a3c2e5 AB	109
ae65a391	110	int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val)
c5a3c2e5 AB	111	{
	112	unsigned long buid, addr;
	113	int ret;
	114
ae65a391	115	if (!pdn)
c5a3c2e5	116	return PCIBIOS_DEVICE_NOT_FOUND;
1635317f	117	if (!config_access_valid(pdn, where))
c5a3c2e5	118	return PCIBIOS_BAD_REGISTER_NUMBER;
3409eb4e GS	119	#ifdef CONFIG_EEH
	120	if (pdn->edev && pdn->edev->pe &&
	121	(pdn->edev->pe->state & EEH_PE_CFG_BLOCKED))
	122	return PCIBIOS_SET_FAILED;
	123	#endif
c5a3c2e5	124
6f3d5d3c	125	addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
1635317f	126	buid = pdn->phb->buid;
c5a3c2e5	127	if (buid) {
ae65a391 LV	128	ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr,
ae65a391 LV	129	BUID_HI(buid), BUID_LO(buid), size, (ulong) val);
c5a3c2e5 AB	130	} else {
	131	ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
	132	}
	133
	134	if (ret)
	135	return PCIBIOS_DEVICE_NOT_FOUND;
	136
	137	return PCIBIOS_SUCCESSFUL;
	138	}
	139
	140	static int rtas_pci_write_config(struct pci_bus *bus,
	141	unsigned int devfn,
	142	int where, int size, u32 val)
	143	{
d0914f50	144	struct pci_dn *pdn;
d0914f50	145
f9df74df	146	pdn = pci_get_pdn_by_devfn(bus, devfn);
d0914f50	147
f9df74df	148	/* Validity of pdn is checked in here. */
3409eb4e	149	return rtas_write_config(pdn, where, size, val);
c5a3c2e5 AB	150	}
c5a3c2e5 AB	151
1c21a293	152	static struct pci_ops rtas_pci_ops = {
8674e0c9 NL	153	.read = rtas_pci_read_config,
8674e0c9 NL	154	.write = rtas_pci_write_config,
c5a3c2e5 AB	155	};
c5a3c2e5 AB	156
1c21a293	157	static int is_python(struct device_node *dev)
c5a3c2e5	158	{
e2eb6392	159	const char *model = of_get_property(dev, "model", NULL);
c5a3c2e5 AB	160
	161	if (model && strstr(model, "Python"))
	162	return 1;
	163
	164	return 0;
	165	}
	166
cc5d0189	167	static void python_countermeasures(struct device_node *dev)
c5a3c2e5	168	{
cc5d0189	169	struct resource registers;
c5a3c2e5 AB	170	void __iomem *chip_regs;
	171	volatile u32 val;
	172
cc5d0189 BH	173	if (of_address_to_resource(dev, 0, &registers)) {
cc5d0189 BH	174	printk(KERN_ERR "Can't get address for Python workarounds !\n");
c5a3c2e5	175	return;
cc5d0189	176	}
c5a3c2e5 AB	177
c5a3c2e5 AB	178	/* Python's register file is 1 MB in size. */
cc5d0189	179	chip_regs = ioremap(registers.start & ~(0xfffffUL), 0x100000);
c5a3c2e5	180
ae65a391	181	/*
c5a3c2e5 AB	182	* Firmware doesn't always clear this bit which is critical
	183	* for good performance - Anton
	184	*/
	185
	186	#define PRG_CL_RESET_VALID 0x00010000
	187
	188	val = in_be32(chip_regs + 0xf6030);
	189	if (val & PRG_CL_RESET_VALID) {
	190	printk(KERN_INFO "Python workaround: ");
	191	val &= ~PRG_CL_RESET_VALID;
	192	out_be32(chip_regs + 0xf6030, val);
	193	/*
	194	* We must read it back for changes to
	195	* take effect
	196	*/
	197	val = in_be32(chip_regs + 0xf6030);
	198	printk("reg0: %x\n", val);
	199	}
	200
	201	iounmap(chip_regs);
	202	}
	203
db38f290	204	void __init init_pci_config_tokens(void)
c5a3c2e5 AB	205	{
	206	read_pci_config = rtas_token("read-pci-config");
	207	write_pci_config = rtas_token("write-pci-config");
	208	ibm_read_pci_config = rtas_token("ibm,read-pci-config");
	209	ibm_write_pci_config = rtas_token("ibm,write-pci-config");
	210	}
	211
db38f290	212	unsigned long get_phb_buid(struct device_node *phb)
c5a3c2e5	213	{
6506e710	214	struct resource r;
c5a3c2e5	215
6506e710	216	if (ibm_read_pci_config == -1)
c5a3c2e5	217	return 0;
6506e710	218	if (of_address_to_resource(phb, 0, &r))
c5a3c2e5	219	return 0;
6506e710	220	return r.start;
c5a3c2e5 AB	221	}
	222
	223	static int phb_set_bus_ranges(struct device_node *dev,
	224	struct pci_controller *phb)
	225	{
cf059965	226	const __be32 *bus_range;
c5a3c2e5 AB	227	unsigned int len;
c5a3c2e5 AB	228
e2eb6392	229	bus_range = of_get_property(dev, "bus-range", &len);
c5a3c2e5 AB	230	if (bus_range == NULL \|\| len < 2 * sizeof(int)) {
	231	return 1;
	232	}
ae65a391	233
cf059965 CLG	234	phb->first_busno = be32_to_cpu(bus_range[0]);
cf059965 CLG	235	phb->last_busno = be32_to_cpu(bus_range[1]);
c5a3c2e5 AB	236
	237	return 0;
	238	}
	239
cad5cef6	240	int rtas_setup_phb(struct pci_controller *phb)
c5a3c2e5	241	{
44ef3390	242	struct device_node *dev = phb->dn;
4c9d2800	243
c5a3c2e5	244	if (is_python(dev))
cc5d0189	245	python_countermeasures(dev);
c5a3c2e5 AB	246
	247	if (phb_set_bus_ranges(dev, phb))
	248	return 1;
	249
c5a3c2e5 AB	250	phb->ops = &rtas_pci_ops;
	251	phb->buid = get_phb_buid(dev);
	252
	253	return 0;
	254	}