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Commit ea0d856c authored by Gavin Shan's avatar Gavin Shan Committed by Michael Ellerman
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powerpc/powernv: Functions to get/set PCI slot state 



This exports 4 functions, which base on the corresponding OPAL
APIs to get/set PCI slot status. Those functions are going to
be used by PowerNV PCI hotplug driver:

   pnv_pci_get_device_tree()    opal_get_device_tree()
   pnv_pci_get_presence_state() opal_pci_get_presence_state()
   pnv_pci_get_power_state()    opal_pci_get_power_state()
   pnv_pci_set_power_state()    opal_pci_set_power_state()

Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 7e19bf32

arch/powerpc/include/asm/opal-api.h

+17 −1
Original line number Diff line number Diff line
@@ -158,7 +158,11 @@ 
#define OPAL_LEDS_SET_INDICATOR			115

#define OPAL_CEC_REBOOT2			116

#define OPAL_CONSOLE_FLUSH			117

#define OPAL_LAST				117

#define OPAL_GET_DEVICE_TREE			118

#define OPAL_PCI_GET_PRESENCE_STATE		119

#define OPAL_PCI_GET_POWER_STATE		120

#define OPAL_PCI_SET_POWER_STATE		121

#define OPAL_LAST				121



/* Device tree flags */
@@ -344,6 +348,18 @@ enum OpalPciResetState { 
	OPAL_ASSERT_RESET   = 1

};



enum OpalPciSlotPresence {

	OPAL_PCI_SLOT_EMPTY	= 0,

	OPAL_PCI_SLOT_PRESENT	= 1

};



enum OpalPciSlotPower {

	OPAL_PCI_SLOT_POWER_OFF	= 0,

	OPAL_PCI_SLOT_POWER_ON	= 1,

	OPAL_PCI_SLOT_OFFLINE	= 2,

	OPAL_PCI_SLOT_ONLINE	= 3

};



enum OpalSlotLedType {

	OPAL_SLOT_LED_TYPE_ID = 0,	/* IDENTIFY LED */

	OPAL_SLOT_LED_TYPE_FAULT = 1,	/* FAULT LED */

arch/powerpc/include/asm/opal.h

+6 −0
Original line number Diff line number Diff line
@@ -209,6 +209,12 @@ int64_t opal_flash_write(uint64_t id, uint64_t offset, uint64_t buf, 
		uint64_t size, uint64_t token);

int64_t opal_flash_erase(uint64_t id, uint64_t offset, uint64_t size,

		uint64_t token);

int64_t opal_get_device_tree(uint32_t phandle, uint64_t buf, uint64_t len);

int64_t opal_pci_get_presence_state(uint64_t id, uint64_t data);

int64_t opal_pci_get_power_state(uint64_t id, uint64_t data);

int64_t opal_pci_set_power_state(uint64_t async_token, uint64_t id,

				 uint64_t data);

int64_t opal_pci_poll2(uint64_t id, uint64_t data);



/* Internal functions */

extern int early_init_dt_scan_opal(unsigned long node, const char *uname,

arch/powerpc/include/asm/pnv-pci.h

+6 −0
Original line number Diff line number Diff line
@@ -12,12 +12,18 @@ 


#include <linux/pci.h>

#include <misc/cxl-base.h>

#include <asm/opal-api.h>



#define PCI_SLOT_ID_PREFIX	0x8000000000000000

#define PCI_SLOT_ID(phb_id, bdfn)	\

	(PCI_SLOT_ID_PREFIX | ((uint64_t)(bdfn) << 16) | (phb_id))



extern int pnv_pci_get_slot_id(struct device_node *np, uint64_t *id);

extern int pnv_pci_get_device_tree(uint32_t phandle, void *buf, uint64_t len);

extern int pnv_pci_get_presence_state(uint64_t id, uint8_t *state);

extern int pnv_pci_get_power_state(uint64_t id, uint8_t *state);

extern int pnv_pci_set_power_state(uint64_t id, uint8_t state,

				   struct opal_msg *msg);



int pnv_phb_to_cxl_mode(struct pci_dev *dev, uint64_t mode);

int pnv_cxl_ioda_msi_setup(struct pci_dev *dev, unsigned int hwirq,

arch/powerpc/platforms/powernv/opal-wrappers.S

+4 −0
Original line number Diff line number Diff line
@@ -302,3 +302,7 @@ OPAL_CALL(opal_prd_msg, OPAL_PRD_MSG); 
OPAL_CALL(opal_leds_get_ind,			OPAL_LEDS_GET_INDICATOR);

OPAL_CALL(opal_leds_set_ind,			OPAL_LEDS_SET_INDICATOR);

OPAL_CALL(opal_console_flush,			OPAL_CONSOLE_FLUSH);

OPAL_CALL(opal_get_device_tree,			OPAL_GET_DEVICE_TREE);

OPAL_CALL(opal_pci_get_presence_state,		OPAL_PCI_GET_PRESENCE_STATE);

OPAL_CALL(opal_pci_get_power_state,		OPAL_PCI_GET_POWER_STATE);

OPAL_CALL(opal_pci_set_power_state,		OPAL_PCI_SET_POWER_STATE);

arch/powerpc/platforms/powernv/pci.c

+82 −0
Original line number Diff line number Diff line
@@ -74,6 +74,88 @@ int pnv_pci_get_slot_id(struct device_node *np, uint64_t *id) 
}

EXPORT_SYMBOL_GPL(pnv_pci_get_slot_id);



int pnv_pci_get_device_tree(uint32_t phandle, void *buf, uint64_t len)

{

	int64_t rc;



	if (!opal_check_token(OPAL_GET_DEVICE_TREE))

		return -ENXIO;



	rc = opal_get_device_tree(phandle, (uint64_t)buf, len);

	if (rc < OPAL_SUCCESS)

		return -EIO;



	return rc;

}

EXPORT_SYMBOL_GPL(pnv_pci_get_device_tree);



int pnv_pci_get_presence_state(uint64_t id, uint8_t *state)

{

	int64_t rc;



	if (!opal_check_token(OPAL_PCI_GET_PRESENCE_STATE))

		return -ENXIO;



	rc = opal_pci_get_presence_state(id, (uint64_t)state);

	if (rc != OPAL_SUCCESS)

		return -EIO;



	return 0;

}

EXPORT_SYMBOL_GPL(pnv_pci_get_presence_state);



int pnv_pci_get_power_state(uint64_t id, uint8_t *state)

{

	int64_t rc;



	if (!opal_check_token(OPAL_PCI_GET_POWER_STATE))

		return -ENXIO;



	rc = opal_pci_get_power_state(id, (uint64_t)state);

	if (rc != OPAL_SUCCESS)

		return -EIO;



	return 0;

}

EXPORT_SYMBOL_GPL(pnv_pci_get_power_state);



int pnv_pci_set_power_state(uint64_t id, uint8_t state, struct opal_msg *msg)

{

	struct opal_msg m;

	int token, ret;

	int64_t rc;



	if (!opal_check_token(OPAL_PCI_SET_POWER_STATE))

		return -ENXIO;



	token = opal_async_get_token_interruptible();

	if (unlikely(token < 0))

		return token;



	rc = opal_pci_set_power_state(token, id, (uint64_t)&state);

	if (rc == OPAL_SUCCESS) {

		ret = 0;

		goto exit;

	} else if (rc != OPAL_ASYNC_COMPLETION) {

		ret = -EIO;

		goto exit;

	}



	ret = opal_async_wait_response(token, &m);

	if (ret < 0)

		goto exit;



	if (msg) {

		ret = 1;

		memcpy(msg, &m, sizeof(m));

	}



exit:

	opal_async_release_token(token);

	return ret;

}

EXPORT_SYMBOL_GPL(pnv_pci_set_power_state);



#ifdef CONFIG_PCI_MSI

int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)

{