Commit 80daac3f authored by Stefan Roese's avatar Stefan Roese Committed by Josh Boyer
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[POWERPC] 4xx: Add endpoint support to 4xx PCIe driver 



This patch adds basic endpoint support to the 4xx PCIe driver.

This is done by checking the device_type property of the PCIe
device node ("pci" for root-complex and "pci-endpoint" for endpoint
configuration).

Note: Currently we map a fixed 64MByte window to PLB address 0 (SDRAM).
This should probably be configurable via a dts property.

Signed-off-by: default avatarStefan Roese <sr@denx.de>
Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarJosh Boyer <jwboyer@linux.vnet.ibm.com>
parent a96df496

arch/powerpc/sysdev/ppc4xx_pci.c

+131 −49
Original line number Diff line number Diff line
@@ -1387,6 +1387,34 @@ static void __init ppc4xx_configure_pciex_PIMs(struct ppc4xx_pciex_port *port, 
	resource_size_t size = res->end - res->start + 1;

	u64 sa;



	if (port->endpoint) {

		resource_size_t ep_addr = 0;

		resource_size_t ep_size = 32 << 20;



		/* Currently we map a fixed 64MByte window to PLB address

		 * 0 (SDRAM). This should probably be configurable via a dts

		 * property.

		 */



		/* Calculate window size */

		sa = (0xffffffffffffffffull << ilog2(ep_size));;



		/* Setup BAR0 */

		out_le32(mbase + PECFG_BAR0HMPA, RES_TO_U32_HIGH(sa));

		out_le32(mbase + PECFG_BAR0LMPA, RES_TO_U32_LOW(sa) |

			 PCI_BASE_ADDRESS_MEM_TYPE_64);



		/* Disable BAR1 & BAR2 */

		out_le32(mbase + PECFG_BAR1MPA, 0);

		out_le32(mbase + PECFG_BAR2HMPA, 0);

		out_le32(mbase + PECFG_BAR2LMPA, 0);



		out_le32(mbase + PECFG_PIM01SAH, RES_TO_U32_HIGH(sa));

		out_le32(mbase + PECFG_PIM01SAL, RES_TO_U32_LOW(sa));



		out_le32(mbase + PCI_BASE_ADDRESS_0, RES_TO_U32_LOW(ep_addr));

		out_le32(mbase + PCI_BASE_ADDRESS_1, RES_TO_U32_HIGH(ep_addr));

	} else {

		/* Calculate window size */

		sa = (0xffffffffffffffffull << ilog2(size));;

		if (res->flags & IORESOURCE_PREFETCH)
@@ -1395,7 +1423,9 @@ static void __init ppc4xx_configure_pciex_PIMs(struct ppc4xx_pciex_port *port, 
		out_le32(mbase + PECFG_BAR0HMPA, RES_TO_U32_HIGH(sa));

		out_le32(mbase + PECFG_BAR0LMPA, RES_TO_U32_LOW(sa));



	/* The setup of the split looks weird to me ... let's see if it works */

		/* The setup of the split looks weird to me ... let's see

		 * if it works

		 */

		out_le32(mbase + PECFG_PIM0LAL, 0x00000000);

		out_le32(mbase + PECFG_PIM0LAH, 0x00000000);

		out_le32(mbase + PECFG_PIM1LAL, 0x00000000);
@@ -1403,11 +1433,12 @@ static void __init ppc4xx_configure_pciex_PIMs(struct ppc4xx_pciex_port *port, 
		out_le32(mbase + PECFG_PIM01SAH, 0xffff0000);

		out_le32(mbase + PECFG_PIM01SAL, 0x00000000);



	/* Enable inbound mapping */

	out_le32(mbase + PECFG_PIMEN, 0x1);



		out_le32(mbase + PCI_BASE_ADDRESS_0, RES_TO_U32_LOW(res->start));

		out_le32(mbase + PCI_BASE_ADDRESS_1, RES_TO_U32_HIGH(res->start));

	}



	/* Enable inbound mapping */

	out_le32(mbase + PECFG_PIMEN, 0x1);



	/* Enable I/O, Mem, and Busmaster cycles */

	out_le16(mbase + PCI_COMMAND,
@@ -1422,13 +1453,8 @@ static void __init ppc4xx_pciex_port_setup_hose(struct ppc4xx_pciex_port *port) 
	const int *bus_range;

	int primary = 0, busses;

	void __iomem *mbase = NULL, *cfg_data = NULL;



	/* XXX FIXME: Handle endpoint mode properly */

	if (port->endpoint) {

		printk(KERN_WARNING "PCIE%d: Port in endpoint mode !\n",

		       port->index);

		return;

	}

	const u32 *pval;

	u32 val;



	/* Check if primary bridge */

	if (of_get_property(port->node, "primary", NULL))
@@ -1462,21 +1488,30 @@ static void __init ppc4xx_pciex_port_setup_hose(struct ppc4xx_pciex_port *port) 
		hose->last_busno = hose->first_busno + busses;

	}



	/* We map the external config space in cfg_data and the host config

	 * space in cfg_addr. External space is 1M per bus, internal space

	 * is 4K

	if (!port->endpoint) {

		/* Only map the external config space in cfg_data for

		 * PCIe root-complexes. External space is 1M per bus

		 */

		cfg_data = ioremap(port->cfg_space.start +

				   (hose->first_busno + 1) * 0x100000,

				   busses * 0x100000);

	mbase = ioremap(port->cfg_space.start + 0x10000000, 0x1000);

	if (cfg_data == NULL || mbase == NULL) {

		printk(KERN_ERR "%s: Can't map config space !",

		if (cfg_data == NULL) {

			printk(KERN_ERR "%s: Can't map external config space !",

			       port->node->full_name);

			goto fail;

		}



		hose->cfg_data = cfg_data;

	}



	/* Always map the host config space in cfg_addr.

	 * Internal space is 4K

	 */

	mbase = ioremap(port->cfg_space.start + 0x10000000, 0x1000);

	if (mbase == NULL) {

		printk(KERN_ERR "%s: Can't map internal config space !",

		       port->node->full_name);

		goto fail;

	}

	hose->cfg_addr = mbase;



	pr_debug("PCIE %s, bus %d..%d\n", port->node->full_name,
@@ -1489,12 +1524,14 @@ static void __init ppc4xx_pciex_port_setup_hose(struct ppc4xx_pciex_port *port) 
	port->hose = hose;

	mbase = (void __iomem *)hose->cfg_addr;



	if (!port->endpoint) {

		/*

		 * Set bus numbers on our root port

		 */

		out_8(mbase + PCI_PRIMARY_BUS, hose->first_busno);

		out_8(mbase + PCI_SECONDARY_BUS, hose->first_busno + 1);

		out_8(mbase + PCI_SUBORDINATE_BUS, hose->last_busno);

	}



	/*

	 * OMRs are already reset, also disable PIMs
@@ -1515,17 +1552,49 @@ static void __init ppc4xx_pciex_port_setup_hose(struct ppc4xx_pciex_port *port) 
	ppc4xx_configure_pciex_PIMs(port, hose, mbase, &dma_window);



	/* The root complex doesn't show up if we don't set some vendor

	 * and device IDs into it. Those are the same bogus one that the

	 * initial code in arch/ppc add. We might want to change that.

	 * and device IDs into it. The defaults below are the same bogus

	 * one that the initial code in arch/ppc had. This can be

	 * overwritten by setting the "vendor-id/device-id" properties

	 * in the pciex node.

	 */

	out_le16(mbase + 0x200, 0xaaa0 + port->index);

	out_le16(mbase + 0x202, 0xbed0 + port->index);



	/* Get the (optional) vendor-/device-id from the device-tree */

	pval = of_get_property(port->node, "vendor-id", NULL);

	if (pval) {

		val = *pval;

	} else {

		if (!port->endpoint)

			val = 0xaaa0 + port->index;

		else

			val = 0xeee0 + port->index;

	}

	out_le16(mbase + 0x200, val);



	pval = of_get_property(port->node, "device-id", NULL);

	if (pval) {

		val = *pval;

	} else {

		if (!port->endpoint)

			val = 0xbed0 + port->index;

		else

			val = 0xfed0 + port->index;

	}

	out_le16(mbase + 0x202, val);



	if (!port->endpoint) {

		/* Set Class Code to PCI-PCI bridge and Revision Id to 1 */

		out_le32(mbase + 0x208, 0x06040001);



		printk(KERN_INFO "PCIE%d: successfully set as root-complex\n",

		       port->index);

	} else {

		/* Set Class Code to Processor/PPC */

		out_le32(mbase + 0x208, 0x0b200001);



		printk(KERN_INFO "PCIE%d: successfully set as endpoint\n",

		       port->index);

	}



	return;

 fail:

	if (hose)
@@ -1542,6 +1611,7 @@ static void __init ppc4xx_probe_pciex_bridge(struct device_node *np) 
	const u32 *pval;

	int portno;

	unsigned int dcrs;

	const char *val;



	/* First, proceed to core initialization as we assume there's

	 * only one PCIe core in the system
@@ -1573,8 +1643,20 @@ static void __init ppc4xx_probe_pciex_bridge(struct device_node *np) 
	}

	port->sdr_base = *pval;



	/* XXX Currently, we only support root complex mode */

	/* Check if device_type property is set to "pci" or "pci-endpoint".

	 * Resulting from this setup this PCIe port will be configured

	 * as root-complex or as endpoint.

	 */

	val = of_get_property(port->node, "device_type", NULL);

	if (!strcmp(val, "pci-endpoint")) {

		port->endpoint = 1;

	} else if (!strcmp(val, "pci")) {

		port->endpoint = 0;

	} else {

		printk(KERN_ERR "PCIE: missing or incorrect device_type for %s\n",

		       np->full_name);

		return;

	}



	/* Fetch config space registers address */

	if (of_address_to_resource(np, 0, &port->cfg_space)) {

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