ixp: move pci drivers to drivers/pci

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

1 files changed, 571 insertions, 0 deletions

diff --git a/drivers/pci/pci_ixp.c b/drivers/pci/pci_ixp.c
new file mode 100644
index 0000000..aae3d3d
--- /dev/null
+++ b/drivers/pci/pci_ixp.c
@@ -0,0 +1,571 @@
+/*
+ * IXP PCI Init
+ * (C) Copyright 2004 eslab.whut.edu.cn
+ * Yue Hu(huyue_whut@yahoo.com.cn), Ligong Xue(lgxue@hotmail.com)
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <common.h>
+#include <asm/processor.h>
+#include <asm/io.h>
+#include <pci.h>
+#include <asm/arch/ixp425.h>
+#include <asm/arch/ixp425pci.h>
+
+static void non_prefetch_read (unsigned int addr, unsigned int cmd,
+			       unsigned int *data);
+static void non_prefetch_write (unsigned int addr, unsigned int cmd,
+				unsigned int data);
+static void configure_pins (void);
+static void sys_pci_gpio_clock_config (void);
+static void pci_bus_scan (void);
+static int pci_device_exists (unsigned int deviceNo);
+static void sys_pci_bar_info_get (unsigned int devnum, unsigned int bus,
+				  unsigned int dev, unsigned int func);
+static void sys_pci_device_bars_write (void);
+static void calc_bars (PciBar * Bars[], unsigned int nBars,
+		       unsigned int startAddr);
+
+#define PCI_MEMORY_BUS		0x00000000
+#define PCI_MEMORY_PHY		0x48000000
+#define PCI_MEMORY_SIZE		0x04000000
+
+#define PCI_MEM_BUS		0x40000000
+#define PCI_MEM_PHY		0x00000000
+#define PCI_MEM_SIZE		0x04000000
+
+#define	PCI_IO_BUS		0x40000000
+#define PCI_IO_PHY		0x50000000
+#define PCI_IO_SIZE		0x10000000
+
+struct pci_controller hose;
+
+unsigned int nDevices;
+unsigned int nMBars;
+unsigned int nIOBars;
+PciBar *memBars[IXP425_PCI_MAX_BAR];
+PciBar *ioBars[IXP425_PCI_MAX_BAR];
+PciDevice devices[IXP425_PCI_MAX_FUNC_ON_BUS];
+
+int pci_read_config_dword (pci_dev_t dev, int where, unsigned int *val)
+{
+	unsigned int retval;
+	unsigned int addr;
+
+	/*address bits 31:28 specify the device 10:8 specify the function */
+	/*Set the address to be read */
+	addr = BIT ((31 - dev)) | (where & ~3);
+	non_prefetch_read (addr, NP_CMD_CONFIGREAD, &retval);
+
+	*val = retval;
+
+	return (OK);
+}
+
+int pci_read_config_word (pci_dev_t dev, int where, unsigned short *val)
+{
+	unsigned int n;
+	unsigned int retval;
+	unsigned int addr;
+	unsigned int byteEnables;
+
+	n = where % 4;
+	/*byte enables are 4 bits active low, the position of each
+	   bit maps to the byte that it enables */
+	byteEnables =
+		(~(BIT (n) | BIT ((n + 1)))) &
+		IXP425_PCI_BOTTOM_NIBBLE_OF_LONG_MASK;
+	byteEnables = byteEnables << PCI_NP_CBE_BESL;
+	/*address bits 31:28 specify the device 10:8 specify the function */
+	/*Set the address to be read */
+	addr = BIT ((31 - dev)) | (where & ~3);
+	non_prefetch_read (addr, byteEnables | NP_CMD_CONFIGREAD, &retval);
+
+	/*Pick out the word we are interested in */
+	*val = (retval >> (8 * n));
+
+	return (OK);
+}
+
+int pci_read_config_byte (pci_dev_t dev, int where, unsigned char *val)
+{
+	unsigned int retval;
+	unsigned int n;
+	unsigned int byteEnables;
+	unsigned int addr;
+
+	n = where % 4;
+	/*byte enables are 4 bits, active low, the position of each
+	   bit maps to the byte that it enables */
+	byteEnables = (~BIT (n)) & IXP425_PCI_BOTTOM_NIBBLE_OF_LONG_MASK;
+	byteEnables = byteEnables << PCI_NP_CBE_BESL;
+
+	/*address bits 31:28 specify the device, 10:8 specify the function */
+	/*Set the address to be read */
+	addr = BIT ((31 - dev)) | (where & ~3);
+	non_prefetch_read (addr, byteEnables | NP_CMD_CONFIGREAD, &retval);
+	/*Pick out the byte we are interested in */
+	*val = (retval >> (8 * n));
+
+	return (OK);
+}
+
+int pci_write_config_byte (pci_dev_t dev, int where, unsigned char val)
+{
+	unsigned int addr;
+	unsigned int byteEnables;
+	unsigned int n;
+	unsigned int ldata;
+
+	n = where % 4;
+	/*byte enables are 4 bits active low, the position of each
+	   bit maps to the byte that it enables */
+	byteEnables = (~BIT (n)) & IXP425_PCI_BOTTOM_NIBBLE_OF_LONG_MASK;
+	byteEnables = byteEnables << PCI_NP_CBE_BESL;
+	ldata = val << (8 * n);
+	/*address bits 31:28 specify the device 10:8 specify the function */
+	/*Set the address to be written */
+	addr = BIT ((31 - dev)) | (where & ~3);
+	non_prefetch_write (addr, byteEnables | NP_CMD_CONFIGWRITE, ldata);
+
+	return (OK);
+}
+
+int pci_write_config_word (pci_dev_t dev, int where, unsigned short val)
+{
+	unsigned int addr;
+	unsigned int byteEnables;
+	unsigned int n;
+	unsigned int ldata;
+
+	n = where % 4;
+	/*byte enables are 4 bits active low, the position of each
+	   bit maps to the byte that it enables */
+	byteEnables =
+		(~(BIT (n) | BIT ((n + 1)))) &
+		IXP425_PCI_BOTTOM_NIBBLE_OF_LONG_MASK;
+	byteEnables = byteEnables << PCI_NP_CBE_BESL;
+	ldata = val << (8 * n);
+	/*address bits 31:28 specify the device 10:8 specify the function */
+	/*Set the address to be written */
+	addr = BIT (31 - dev) | (where & ~3);
+	non_prefetch_write (addr, byteEnables | NP_CMD_CONFIGWRITE, ldata);
+
+	return (OK);
+}
+
+int pci_write_config_dword (pci_dev_t dev, int where, unsigned int val)
+{
+	unsigned int addr;
+
+	/*address bits 31:28 specify the device 10:8 specify the function */
+	/*Set the address to be written */
+	addr = BIT (31 - dev) | (where & ~3);
+	non_prefetch_write (addr, NP_CMD_CONFIGWRITE, val);
+
+	return (OK);
+}
+
+void non_prefetch_read (unsigned int addr,
+			unsigned int cmd, unsigned int *data)
+{
+	REG_WRITE (PCI_CSR_BASE, PCI_NP_AD_OFFSET, addr);
+
+	/*set up and execute the read */
+	REG_WRITE (PCI_CSR_BASE, PCI_NP_CBE_OFFSET, cmd);
+
+	/*The result of the read is now in np_rdata */
+	REG_READ (PCI_CSR_BASE, PCI_NP_RDATA_OFFSET, *data);
+
+	return;
+}
+
+void non_prefetch_write (unsigned int addr,
+			 unsigned int cmd, unsigned int data)
+{
+
+	REG_WRITE (PCI_CSR_BASE, PCI_NP_AD_OFFSET, addr);
+	/*set up the write */
+	REG_WRITE (PCI_CSR_BASE, PCI_NP_CBE_OFFSET, cmd);
+	/*Execute the write by writing to NP_WDATA */
+	REG_WRITE (PCI_CSR_BASE, PCI_NP_WDATA_OFFSET, data);
+
+	return;
+}
+
+/*
+ * PCI controller config registers are accessed through these functions
+ * i.e. these allow us to set up our own BARs etc.
+ */
+void crp_read (unsigned int offset, unsigned int *data)
+{
+	REG_WRITE (PCI_CSR_BASE, PCI_CRP_AD_CBE_OFFSET, offset);
+	REG_READ (PCI_CSR_BASE, PCI_CRP_RDATA_OFFSET, *data);
+}
+
+void crp_write (unsigned int offset, unsigned int data)
+{
+	/*The CRP address register bit 16 indicates that we want to do a write */
+	REG_WRITE (PCI_CSR_BASE, PCI_CRP_AD_CBE_OFFSET,
+		   PCI_CRP_WRITE | offset);
+	REG_WRITE (PCI_CSR_BASE, PCI_CRP_WDATA_OFFSET, data);
+}
+
+/*struct pci_controller *hose*/
+void pci_ixp_init (struct pci_controller *hose)
+{
+	unsigned int regval;
+
+	hose->first_busno = 0;
+	hose->last_busno = 0x00;
+
+	/* System memory space */
+	pci_set_region (hose->regions + 0,
+			PCI_MEMORY_BUS,
+			PCI_MEMORY_PHY, PCI_MEMORY_SIZE, PCI_REGION_MEMORY);
+
+	/* PCI memory space */
+	pci_set_region (hose->regions + 1,
+			PCI_MEM_BUS,
+			PCI_MEM_PHY, PCI_MEM_SIZE, PCI_REGION_MEM);
+	/* PCI I/O space */
+	pci_set_region (hose->regions + 2,
+			PCI_IO_BUS, PCI_IO_PHY, PCI_IO_SIZE, PCI_REGION_IO);
+
+	hose->region_count = 3;
+
+	pci_register_hose (hose);
+
+/*
+ ==========================================================
+		Init IXP PCI
+ ==========================================================
+*/
+	REG_READ (PCI_CSR_BASE, PCI_CSR_OFFSET, regval);
+	regval |= 1 << 2;
+	REG_WRITE (PCI_CSR_BASE, PCI_CSR_OFFSET, regval);
+
+	configure_pins ();
+
+	READ_GPIO_REG (IXP425_GPIO_GPOUTR, regval);
+	WRITE_GPIO_REG (IXP425_GPIO_GPOUTR, regval & (~(1 << 13)));
+	udelay (533);
+	sys_pci_gpio_clock_config ();
+	REG_WRITE (PCI_CSR_BASE, PCI_INTEN_OFFSET, 0);
+	udelay (100);
+	READ_GPIO_REG (IXP425_GPIO_GPOUTR, regval);
+	WRITE_GPIO_REG (IXP425_GPIO_GPOUTR, regval | (1 << 13));
+	udelay (533);
+	crp_write (PCI_CFG_BASE_ADDRESS_0, IXP425_PCI_BAR_0_DEFAULT);
+	crp_write (PCI_CFG_BASE_ADDRESS_1, IXP425_PCI_BAR_1_DEFAULT);
+	crp_write (PCI_CFG_BASE_ADDRESS_2, IXP425_PCI_BAR_2_DEFAULT);
+	crp_write (PCI_CFG_BASE_ADDRESS_3, IXP425_PCI_BAR_3_DEFAULT);
+	crp_write (PCI_CFG_BASE_ADDRESS_4, IXP425_PCI_BAR_4_DEFAULT);
+	crp_write (PCI_CFG_BASE_ADDRESS_5, IXP425_PCI_BAR_5_DEFAULT);
+	/*Setup PCI-AHB and AHB-PCI address mappings */
+	REG_WRITE (PCI_CSR_BASE, PCI_AHBMEMBASE_OFFSET,
+		   IXP425_PCI_AHBMEMBASE_DEFAULT);
+
+	REG_WRITE (PCI_CSR_BASE, PCI_AHBIOBASE_OFFSET,
+		   IXP425_PCI_AHBIOBASE_DEFAULT);
+
+	REG_WRITE (PCI_CSR_BASE, PCI_PCIMEMBASE_OFFSET,
+		   IXP425_PCI_PCIMEMBASE_DEFAULT);
+
+	crp_write (PCI_CFG_SUB_VENDOR_ID, IXP425_PCI_SUB_VENDOR_SYSTEM);
+
+	REG_READ (PCI_CSR_BASE, PCI_CSR_OFFSET, regval);
+	regval |= PCI_CSR_IC | PCI_CSR_ABE | PCI_CSR_PDS;
+	REG_WRITE (PCI_CSR_BASE, PCI_CSR_OFFSET, regval);
+	crp_write (PCI_CFG_COMMAND, PCI_CFG_CMD_MAE | PCI_CFG_CMD_BME);
+	udelay (1000);
+
+	pci_write_config_word (0, PCI_CFG_COMMAND, INITIAL_PCI_CMD);
+	REG_WRITE (PCI_CSR_BASE, PCI_ISR_OFFSET, PCI_ISR_PSE
+		   | PCI_ISR_PFE | PCI_ISR_PPE | PCI_ISR_AHBE);
+#ifdef CONFIG_PCI_SCAN_SHOW
+	printf ("Device  bus  dev  func  deviceID  vendorID \n");
+#endif
+	pci_bus_scan ();
+}
+
+void configure_pins (void)
+{
+	unsigned int regval;
+
+	/* Disable clock on GPIO PIN 14 */
+	READ_GPIO_REG (IXP425_GPIO_GPCLKR, regval);
+	WRITE_GPIO_REG (IXP425_GPIO_GPCLKR, regval & (~(1 << 8)));
+	READ_GPIO_REG (IXP425_GPIO_GPCLKR, regval);
+
+	READ_GPIO_REG (IXP425_GPIO_GPOER, regval);
+	WRITE_GPIO_REG (IXP425_GPIO_GPOER,
+			(((~(3 << 13)) & regval) | (0xf << 8)));
+	READ_GPIO_REG (IXP425_GPIO_GPOER, regval);
+
+	READ_GPIO_REG (IXP425_GPIO_GPIT2R, regval);
+	WRITE_GPIO_REG (IXP425_GPIO_GPIT2R,
+			(regval &
+			 ((0x1 << 9) | (0x1 << 6) | (0x1 << 3) | 0x1)));
+	READ_GPIO_REG (IXP425_GPIO_GPIT2R, regval);
+
+	READ_GPIO_REG (IXP425_GPIO_GPISR, regval);
+	WRITE_GPIO_REG (IXP425_GPIO_GPISR, (regval | (0xf << 8)));
+	READ_GPIO_REG (IXP425_GPIO_GPISR, regval);
+}
+
+void sys_pci_gpio_clock_config (void)
+{
+	unsigned int regval;
+
+	READ_GPIO_REG (IXP425_GPIO_GPCLKR, regval);
+	regval |= 0x1 << 4;
+	WRITE_GPIO_REG (IXP425_GPIO_GPCLKR, regval);
+	READ_GPIO_REG (IXP425_GPIO_GPCLKR, regval);
+	regval |= 0x1 << 8;
+	WRITE_GPIO_REG (IXP425_GPIO_GPCLKR, regval);
+}
+
+void pci_bus_scan (void)
+{
+	unsigned int bus = 0, dev, func = 0;
+	unsigned short data16;
+	unsigned int data32;
+	unsigned char intPin;
+
+	/* Assign first device to ourselves */
+	devices[0].bus = 0;
+	devices[0].device = 0;
+	devices[0].func = 0;
+
+	crp_read (PCI_CFG_VENDOR_ID, &data32);
+
+	devices[0].vendor_id = data32 & IXP425_PCI_BOTTOM_WORD_OF_LONG_MASK;
+	devices[0].device_id = data32 >> 16;
+	devices[0].error = FALSE;
+	devices[0].bar[NO_BAR].size = 0;	/*dummy - required */
+
+	nDevices = 1;
+
+	nMBars = 0;
+	nIOBars = 0;
+
+	for (dev = 0; dev < IXP425_PCI_MAX_DEV; dev++) {
+
+		/*Check whether a device is present */
+		if (pci_device_exists (dev) != TRUE) {
+
+			/*Clear error bits in ISR, write 1 to clear */
+			REG_WRITE (PCI_CSR_BASE, PCI_ISR_OFFSET, PCI_ISR_PSE
+				   | PCI_ISR_PFE | PCI_ISR_PPE |
+				   PCI_ISR_AHBE);
+			continue;
+		}
+
+		/*A device is present, add an entry to the array */
+		devices[nDevices].bus = bus;
+		devices[nDevices].device = dev;
+		devices[nDevices].func = func;
+
+		pci_read_config_word (dev, PCI_CFG_VENDOR_ID, &data16);
+
+		devices[nDevices].vendor_id = data16;
+
+		pci_read_config_word (dev, PCI_CFG_DEVICE_ID, &data16);
+		devices[nDevices].device_id = data16;
+
+		/*The device is functioning correctly, set error to FALSE */
+		devices[nDevices].error = FALSE;
+
+		/*Figure out what BARs are on this device */
+		sys_pci_bar_info_get (nDevices, bus, dev, func);
+		/*Figure out what INTX# line the card uses */
+		pci_read_config_byte (dev, PCI_CFG_DEV_INT_PIN, &intPin);
+
+		/*assign the appropriate irq line */
+		if (intPin > PCI_IRQ_LINES) {
+			devices[nDevices].error = TRUE;
+		} else if (intPin != 0) {
+			/*This device uses an interrupt line */
+			/*devices[nDevices].irq = ixp425PciIntTranslate[dev][intPin-1]; */
+			devices[nDevices].irq = intPin;
+		}
+#ifdef CONFIG_PCI_SCAN_SHOW
+		printf ("%06d    %03d %03d %04d  %08d      %08x\n", nDevices,
+			devices[nDevices].vendor_id);
+#endif
+		nDevices++;
+
+	}
+
+	calc_bars (memBars, nMBars, IXP425_PCI_BAR_MEM_BASE);
+	sys_pci_device_bars_write ();
+
+	REG_WRITE (PCI_CSR_BASE, PCI_ISR_OFFSET, PCI_ISR_PSE
+		   | PCI_ISR_PFE | PCI_ISR_PPE | PCI_ISR_AHBE);
+}
+
+void sys_pci_bar_info_get (unsigned int devnum,
+			   unsigned int bus,
+			   unsigned int dev, unsigned int func)
+{
+	unsigned int data32;
+	unsigned int tmp;
+	unsigned int size;
+
+	pci_write_config_dword (devnum,
+				PCI_CFG_BASE_ADDRESS_0, IXP425_PCI_BAR_QUERY);
+	pci_read_config_dword (devnum, PCI_CFG_BASE_ADDRESS_0, &data32);
+
+	devices[devnum].bar[0].address = (data32 & 1);
+
+	if (data32 & 1) {
+		/* IO space */
+		tmp = data32 & ~0x3;
+		size = ~(tmp - 1);
+		devices[devnum].bar[0].size = size;
+
+		if (nIOBars < IXP425_PCI_MAX_BAR) {
+			ioBars[nIOBars++] = &devices[devnum].bar[0];
+		}
+	} else {
+		/* Mem space */
+		tmp = data32 & ~IXP425_PCI_BOTTOM_NIBBLE_OF_LONG_MASK;
+		size = ~(tmp - 1);
+		devices[devnum].bar[0].size = size;
+
+		if (nMBars < IXP425_PCI_MAX_BAR) {
+			memBars[nMBars++] = &devices[devnum].bar[0];
+		} else {
+			devices[devnum].error = TRUE;
+		}
+
+	}
+
+	devices[devnum].bar[1].size = 0;
+}
+
+void sortBars (PciBar * Bars[], unsigned int nBars)
+{
+	unsigned int i, j;
+	PciBar *tmp;
+
+	if (nBars == 0) {
+		return;
+	}
+
+	/* Sort biggest to smallest */
+	for (i = 0; i < nBars - 1; i++) {
+		for (j = i + 1; j < nBars; j++) {
+			if (Bars[j]->size > Bars[i]->size) {
+				/* swap them */
+				tmp = Bars[i];
+				Bars[i] = Bars[j];
+				Bars[j] = tmp;
+			}
+		}
+	}
+}
+
+void calc_bars (PciBar * Bars[], unsigned int nBars, unsigned int startAddr)
+{
+	unsigned int i;
+
+	if (nBars == 0) {
+		return;
+	}
+
+	for (i = 0; i < nBars; i++) {
+		Bars[i]->address |= startAddr;
+		startAddr += Bars[i]->size;
+	}
+}
+
+void sys_pci_device_bars_write (void)
+{
+	unsigned int i;
+	int addr;
+
+	for (i = 1; i < nDevices; i++) {
+		if (devices[i].error) {
+			continue;
+		}
+
+		pci_write_config_dword (devices[i].device,
+					PCI_CFG_BASE_ADDRESS_0,
+					devices[i].bar[0].address);
+		addr = BIT (31 - devices[i].device) |
+			(0 << PCI_NP_AD_FUNCSL) |
+			(PCI_CFG_BASE_ADDRESS_0 & ~3);
+		pci_write_config_dword (devices[i].device,
+					PCI_CFG_DEV_INT_LINE, devices[i].irq);
+
+		pci_write_config_word (devices[i].device,
+				       PCI_CFG_COMMAND, INITIAL_PCI_CMD);
+
+	}
+}
+
+
+int pci_device_exists (unsigned int deviceNo)
+{
+	unsigned int vendorId;
+	unsigned int regval;
+
+	pci_read_config_dword (deviceNo, PCI_CFG_VENDOR_ID, &vendorId);
+
+	/* There are two ways to find out an empty device.
+	 *   1. check Master Abort bit after the access.
+	 *   2. check whether the vendor id read back is 0x0.
+	 */
+	REG_READ (PCI_CSR_BASE, PCI_ISR_OFFSET, regval);
+	if ((vendorId != 0x0) && ((regval & PCI_ISR_PFE) == 0)) {
+		return TRUE;
+	}
+	/*no device present, make sure that the master abort bit is reset */
+
+	REG_WRITE (PCI_CSR_BASE, PCI_ISR_OFFSET, PCI_ISR_PFE);
+	return FALSE;
+}
+
+pci_dev_t pci_find_devices (struct pci_device_id * ids, int devNo)
+{
+	unsigned int i;
+	unsigned int devdidvid;
+	unsigned int didvid;
+	unsigned int vendorId, deviceId;
+
+	vendorId = ids->vendor;
+	deviceId = ids->device;
+	didvid = ((deviceId << 16) & IXP425_PCI_TOP_WORD_OF_LONG_MASK) |
+		(vendorId & IXP425_PCI_BOTTOM_WORD_OF_LONG_MASK);
+
+	for (i = devNo + 1; i < nDevices; i++) {
+
+		pci_read_config_dword (devices[i].device, PCI_CFG_VENDOR_ID,
+				       &devdidvid);
+
+		if (devdidvid == didvid) {
+			return devices[i].device;
+		}
+	}
+	return -1;
+}