20  * Ported from Linux driver - driver/pci/host/pci-aardvark.c
31 #include <asm-generic/gpio.h>
135  * struct pcie_advk - Advk PCIe controller state
139  *               first_busno stores the bus number of the PCIe root-port
140  *               number which may vary depending on the PCIe setup
152 	writel(val, pcie->base + reg);  in advk_writel()
157 	return readl(pcie->base + reg);  in advk_readl()
161  * pcie_advk_addr_valid() - Check for valid bus address
166  * Return: 1 on valid, 0 on invalid
171 	 * In PCIE-E only a single device (0) can exist  in pcie_advk_addr_valid()
172 	 * on the local bus. Beyound the local bus, there might be  in pcie_advk_addr_valid()
182  * pcie_advk_wait_pio() - Wait for PIO access to be accomplished
186  * Wait up to 1 micro second for PIO access to be accomplished.
208 	dev_err(pcie->dev, "config read/write timed out\n");  in pcie_advk_wait_pio()
213  * pcie_advk_check_pio_status() - Validate PIO status and get the read result
216  * @read: Read from or write to configuration space - true(read) false(write)
217  * @read_val: Pointer to the read result, only valid when read is true
221 				      bool read,  in pcie_advk_check_pio_status()  argument
238 		/* Get the read result */  in pcie_advk_check_pio_status()
239 		if (read)  in pcie_advk_check_pio_status()
245 		if (read) {  in pcie_advk_check_pio_status()
254 		if (read) {  in pcie_advk_check_pio_status()
274 		str_posted = "Non-posted";  in pcie_advk_check_pio_status()
278 	dev_err(pcie->dev, "%s PIO Response Status: %s, %#x @ %#x\n",  in pcie_advk_check_pio_status()
282 	return -EFAULT;  in pcie_advk_check_pio_status()
286  * pcie_advk_read_config() - Read from configuration space
291  * @valuep: A pointer at which to store the read value
294  * Read a value of size @size from offset @offset within the configuration
296  * on the PCI bus @bus.
298  * Return: 0 on success
308 	dev_dbg(pcie->dev, "PCIE CFG read:  (b,d,f)=(%2d,%2d,%2d) ",  in pcie_advk_read_config()
311 	if (!pcie_advk_addr_valid(bdf, pcie->first_busno)) {  in pcie_advk_read_config()
312 		dev_dbg(pcie->dev, "- out of range\n");  in pcie_advk_read_config()
324 	if (PCI_BUS(bdf) == pcie->first_busno)  in pcie_advk_read_config()
339 		return -EINVAL;  in pcie_advk_read_config()
341 	/* Check PIO status and get the read result */  in pcie_advk_read_config()
346 	dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08x)\n",  in pcie_advk_read_config()
354  * pcie_calc_datastrobe() - Calculate data strobe
377 	data_strobe = GENMASK(bytes - 1, 0) << (offset & 0x3);  in pcie_calc_datastrobe()
383  * pcie_advk_write_config() - Write to configuration space
393  * numbers in @bdf on the PCI bus @bus.
395  * Return: 0 on success
404 	dev_dbg(pcie->dev, "PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",  in pcie_advk_write_config()
406 	dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08lx)\n",  in pcie_advk_write_config()
409 	if (!pcie_advk_addr_valid(bdf, pcie->first_busno)) {  in pcie_advk_write_config()
410 		dev_dbg(pcie->dev, "- out of range\n");  in pcie_advk_write_config()
421 	if (PCI_BUS(bdf) == pcie->first_busno)  in pcie_advk_write_config()
431 	dev_dbg(pcie->dev, "\tPIO req. - addr = 0x%08x\n", reg);  in pcie_advk_write_config()
436 	dev_dbg(pcie->dev, "\tPIO req. - val  = 0x%08x\n", reg);  in pcie_advk_write_config()
441 	dev_dbg(pcie->dev, "\tPIO req. - strb = 0x%02x\n", reg);  in pcie_advk_write_config()
447 		dev_dbg(pcie->dev, "- wait pio timeout\n");  in pcie_advk_write_config()
448 		return -EINVAL;  in pcie_advk_write_config()
458  * pcie_advk_link_up() - Check if PCIe link is up or not
462  * Return 1 (true) on link up.
463  * Return 0 (false) on link down.
475  * pcie_advk_wait_for_link() - Wait for link training to be accomplished
479  * Wait up to 1 second for link training to be accomplished.
491 			printf("PCIE-%d: Link up\n", pcie->first_busno);  in pcie_advk_wait_for_link()
498 	printf("PCIE-%d: Link down\n", pcie->first_busno);  in pcie_advk_wait_for_link()
500 	return -ETIMEDOUT;  in pcie_advk_wait_for_link()
504  * pcie_advk_setup_hw() - PCIe initailzation
508  * Return: 0 on success
586 	/* Wait for PCIe link up */  in pcie_advk_setup_hw()
588 		return -ENXIO;  in pcie_advk_setup_hw()
600  * pcie_advk_probe() - Probe the PCIe bus for active link
602  * @dev: A pointer to the device being operated on
604  * Probe for an active link on the PCIe bus and configure the controller
607  * Return: 0 on success, else -ENODEV
616 	gpio_request_by_name(dev, "reset-gpio", 0, &reset_gpio,  in pcie_advk_probe()
619 	 * Issue reset to add-in card through the dedicated GPIO.  in pcie_advk_probe()
625 	 * FIX-ME:  in pcie_advk_probe()
632 		dev_dbg(pcie->dev, "Toggle PCIE Reset GPIO ...\n");  in pcie_advk_probe()
638 	dev_dbg(pcie->dev, "PCIE Reset on GPIO support is missing\n");  in pcie_advk_probe()
641 	pcie->first_busno = dev->seq;  in pcie_advk_probe()
642 	pcie->dev = pci_get_controller(dev);  in pcie_advk_probe()
648  * pcie_advk_ofdata_to_platdata() - Translate from DT to device state
650  * @dev: A pointer to the device being operated on
656  * Return: 0 on success, else -EINVAL
663 	pcie->base = (void *)dev_read_addr_index(dev, 0);  in pcie_advk_ofdata_to_platdata()
664 	if ((fdt_addr_t)pcie->base == FDT_ADDR_T_NONE)  in pcie_advk_ofdata_to_platdata()
665 		return -EINVAL;  in pcie_advk_ofdata_to_platdata()
676 	{ .compatible = "marvell,armada-37xx-pcie" },