2 * Low-Level PCI Express Support for the SH7786
4 * Copyright (C) 2009 - 2010 Paul Mundt
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
10 #include <linux/pci.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
14 #include <linux/delay.h>
15 #include <linux/slab.h>
16 #include "pcie-sh7786.h"
17 #include <asm/sizes.h>
19 struct sh7786_pcie_port {
20 struct pci_channel *hose;
26 static struct sh7786_pcie_port *sh7786_pcie_ports;
27 static unsigned int nr_ports;
29 static struct sh7786_pcie_hwops {
30 int (*core_init)(void);
31 int (*port_init_hw)(struct sh7786_pcie_port *port);
34 static struct resource sh7786_pci0_resources[] = {
38 .end = 0xfd000000 + SZ_8M - 1,
39 .flags = IORESOURCE_IO,
41 .name = "PCIe0 MEM 0",
43 .end = 0xc0000000 + SZ_512M - 1,
44 .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
46 .name = "PCIe0 MEM 1",
48 .end = 0x10000000 + SZ_64M - 1,
49 .flags = IORESOURCE_MEM,
51 .name = "PCIe0 MEM 2",
53 .end = 0xfe100000 + SZ_1M - 1,
57 static struct resource sh7786_pci1_resources[] = {
61 .end = 0xfd800000 + SZ_8M - 1,
62 .flags = IORESOURCE_IO,
64 .name = "PCIe1 MEM 0",
66 .end = 0xa0000000 + SZ_512M - 1,
67 .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
69 .name = "PCIe1 MEM 1",
71 .end = 0x30000000 + SZ_256M - 1,
72 .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
74 .name = "PCIe1 MEM 2",
76 .end = 0xfe300000 + SZ_1M - 1,
80 static struct resource sh7786_pci2_resources[] = {
84 .end = 0xfc800000 + SZ_4M - 1,
86 .name = "PCIe2 MEM 0",
88 .end = 0x80000000 + SZ_512M - 1,
89 .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
91 .name = "PCIe2 MEM 1",
93 .end = 0x20000000 + SZ_256M - 1,
94 .flags = IORESOURCE_MEM | IORESOURCE_MEM_32BIT,
96 .name = "PCIe2 MEM 2",
98 .end = 0xfcd00000 + SZ_1M - 1,
102 extern struct pci_ops sh7786_pci_ops;
104 #define DEFINE_CONTROLLER(start, idx) \
106 .pci_ops = &sh7786_pci_ops, \
107 .resources = sh7786_pci##idx##_resources, \
108 .nr_resources = ARRAY_SIZE(sh7786_pci##idx##_resources), \
114 static struct pci_channel sh7786_pci_channels[] = {
115 DEFINE_CONTROLLER(0xfe000000, 0),
116 DEFINE_CONTROLLER(0xfe200000, 1),
117 DEFINE_CONTROLLER(0xfcc00000, 2),
120 static int phy_wait_for_ack(struct pci_channel *chan)
122 unsigned int timeout = 100;
125 if (pci_read_reg(chan, SH4A_PCIEPHYADRR) & (1 << BITS_ACK))
134 static int pci_wait_for_irq(struct pci_channel *chan, unsigned int mask)
136 unsigned int timeout = 100;
139 if ((pci_read_reg(chan, SH4A_PCIEINTR) & mask) == mask)
148 static void phy_write_reg(struct pci_channel *chan, unsigned int addr,
149 unsigned int lane, unsigned int data)
151 unsigned long phyaddr;
153 phyaddr = (1 << BITS_CMD) + ((lane & 0xf) << BITS_LANE) +
154 ((addr & 0xff) << BITS_ADR);
157 pci_write_reg(chan, data, SH4A_PCIEPHYDOUTR);
158 pci_write_reg(chan, phyaddr, SH4A_PCIEPHYADRR);
160 phy_wait_for_ack(chan);
163 pci_write_reg(chan, 0, SH4A_PCIEPHYDOUTR);
164 pci_write_reg(chan, 0, SH4A_PCIEPHYADRR);
166 phy_wait_for_ack(chan);
169 static int phy_init(struct pci_channel *chan)
172 unsigned int timeout = 100;
175 ctrl = pci_read_reg(chan, SH4A_PCIEPHYCTLR);
176 ctrl |= (1 << BITS_CKE);
177 pci_write_reg(chan, ctrl, SH4A_PCIEPHYCTLR);
179 /* Initialize the phy */
180 phy_write_reg(chan, 0x60, 0xf, 0x004b008b);
181 phy_write_reg(chan, 0x61, 0xf, 0x00007b41);
182 phy_write_reg(chan, 0x64, 0xf, 0x00ff4f00);
183 phy_write_reg(chan, 0x65, 0xf, 0x09070907);
184 phy_write_reg(chan, 0x66, 0xf, 0x00000010);
185 phy_write_reg(chan, 0x74, 0xf, 0x0007001c);
186 phy_write_reg(chan, 0x79, 0xf, 0x01fc000d);
187 phy_write_reg(chan, 0xb0, 0xf, 0x00000610);
189 /* Deassert Standby */
190 phy_write_reg(chan, 0x67, 0x1, 0x00000400);
193 ctrl = pci_read_reg(chan, SH4A_PCIEPHYCTLR);
194 ctrl &= ~(1 << BITS_CKE);
195 pci_write_reg(chan, ctrl, SH4A_PCIEPHYCTLR);
198 if (pci_read_reg(chan, SH4A_PCIEPHYSR))
207 static int pcie_init(struct sh7786_pcie_port *port)
209 struct pci_channel *chan = port->hose;
215 /* Begin initialization */
216 pci_write_reg(chan, 0, SH4A_PCIETCTLR);
218 /* Initialize as type1. */
219 data = pci_read_reg(chan, SH4A_PCIEPCICONF3);
220 data &= ~(0x7f << 16);
221 data |= PCI_HEADER_TYPE_BRIDGE << 16;
222 pci_write_reg(chan, data, SH4A_PCIEPCICONF3);
224 /* Initialize default capabilities. */
225 data = pci_read_reg(chan, SH4A_PCIEEXPCAP0);
226 data &= ~(PCI_EXP_FLAGS_TYPE << 16);
229 data |= PCI_EXP_TYPE_ENDPOINT << 20;
231 data |= PCI_EXP_TYPE_ROOT_PORT << 20;
233 data |= PCI_CAP_ID_EXP;
234 pci_write_reg(chan, data, SH4A_PCIEEXPCAP0);
236 /* Enable data link layer active state reporting */
237 pci_write_reg(chan, PCI_EXP_LNKCAP_DLLLARC, SH4A_PCIEEXPCAP3);
239 /* Enable extended sync and ASPM L0s support */
240 data = pci_read_reg(chan, SH4A_PCIEEXPCAP4);
241 data &= ~PCI_EXP_LNKCTL_ASPMC;
242 data |= PCI_EXP_LNKCTL_ES | 1;
243 pci_write_reg(chan, data, SH4A_PCIEEXPCAP4);
245 /* Write out the physical slot number */
246 data = pci_read_reg(chan, SH4A_PCIEEXPCAP5);
247 data &= ~PCI_EXP_SLTCAP_PSN;
248 data |= (port->index + 1) << 19;
249 pci_write_reg(chan, data, SH4A_PCIEEXPCAP5);
251 /* Set the completion timer timeout to the maximum 32ms. */
252 data = pci_read_reg(chan, SH4A_PCIETLCTLR);
255 pci_write_reg(chan, data, SH4A_PCIETLCTLR);
258 * Set fast training sequences to the maximum 255,
259 * and enable MAC data scrambling.
261 data = pci_read_reg(chan, SH4A_PCIEMACCTLR);
262 data &= ~PCIEMACCTLR_SCR_DIS;
263 data |= (0xff << 16);
264 pci_write_reg(chan, data, SH4A_PCIEMACCTLR);
266 memphys = __pa(memory_start);
267 memsize = roundup_pow_of_two(memory_end - memory_start);
270 * If there's more than 512MB of memory, we need to roll over to
273 if (memsize > SZ_512M) {
274 __raw_writel(memphys + SZ_512M, chan->reg_base + SH4A_PCIELAR1);
275 __raw_writel(((memsize - SZ_512M) - SZ_256) | 1,
276 chan->reg_base + SH4A_PCIELAMR1);
280 * Otherwise just zero it out and disable it.
282 __raw_writel(0, chan->reg_base + SH4A_PCIELAR1);
283 __raw_writel(0, chan->reg_base + SH4A_PCIELAMR1);
287 * LAR0/LAMR0 covers up to the first 512MB, which is enough to
288 * cover all of lowmem on most platforms.
290 __raw_writel(memphys, chan->reg_base + SH4A_PCIELAR0);
291 __raw_writel((memsize - SZ_256) | 1, chan->reg_base + SH4A_PCIELAMR0);
293 __raw_writel(memphys, chan->reg_base + SH4A_PCIEPCICONF4);
294 __raw_writel(0, chan->reg_base + SH4A_PCIEPCICONF5);
296 /* Finish initialization */
297 data = pci_read_reg(chan, SH4A_PCIETCTLR);
299 pci_write_reg(chan, data, SH4A_PCIETCTLR);
301 /* Enable DL_Active Interrupt generation */
302 data = pci_read_reg(chan, SH4A_PCIEDLINTENR);
303 data |= PCIEDLINTENR_DLL_ACT_ENABLE;
304 pci_write_reg(chan, data, SH4A_PCIEDLINTENR);
306 /* Disable MAC data scrambling. */
307 data = pci_read_reg(chan, SH4A_PCIEMACCTLR);
308 data |= PCIEMACCTLR_SCR_DIS | (0xff << 16);
309 pci_write_reg(chan, data, SH4A_PCIEMACCTLR);
311 ret = pci_wait_for_irq(chan, MASK_INT_TX_CTRL);
312 if (unlikely(ret != 0))
315 data = pci_read_reg(chan, SH4A_PCIEPCICONF1);
316 data &= ~(PCI_STATUS_DEVSEL_MASK << 16);
317 data |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
318 (PCI_STATUS_CAP_LIST | PCI_STATUS_DEVSEL_FAST) << 16;
319 pci_write_reg(chan, data, SH4A_PCIEPCICONF1);
321 pci_write_reg(chan, 0x80888000, SH4A_PCIETXVC0DCTLR);
322 pci_write_reg(chan, 0x00222000, SH4A_PCIERXVC0DCTLR);
326 data = pci_read_reg(chan, SH4A_PCIEMACSR);
327 printk(KERN_NOTICE "PCI: PCIe#%d link width %d\n",
328 port->index, (data >> 20) & 0x3f);
331 for (i = 0; i < chan->nr_resources; i++) {
332 struct resource *res = chan->resources + i;
333 resource_size_t size;
336 pci_write_reg(chan, 0x00000000, SH4A_PCIEPTCTLR(i));
338 size = resource_size(res);
341 * The PAMR mask is calculated in units of 256kB, which
342 * keeps things pretty simple.
344 __raw_writel(((roundup_pow_of_two(size) / SZ_256K) - 1) << 18,
345 chan->reg_base + SH4A_PCIEPAMR(i));
347 pci_write_reg(chan, 0x00000000, SH4A_PCIEPARH(i));
348 pci_write_reg(chan, 0x00000000, SH4A_PCIEPARL(i));
350 enable_mask = MASK_PARE;
351 if (res->flags & IORESOURCE_IO)
352 enable_mask |= MASK_SPC;
354 pci_write_reg(chan, enable_mask, SH4A_PCIEPTCTLR(i));
360 int __init pcibios_map_platform_irq(struct pci_dev *pdev, u8 slot, u8 pin)
365 static int sh7786_pcie_core_init(void)
367 /* Return the number of ports */
368 return test_mode_pin(MODE_PIN12) ? 3 : 2;
371 static int __devinit sh7786_pcie_init_hw(struct sh7786_pcie_port *port)
375 ret = phy_init(port->hose);
376 if (unlikely(ret < 0))
380 * Check if we are configured in endpoint or root complex mode,
381 * this is a fixed pin setting that applies to all PCIe ports.
383 port->endpoint = test_mode_pin(MODE_PIN11);
385 ret = pcie_init(port);
386 if (unlikely(ret < 0))
389 return register_pci_controller(port->hose);
392 static struct sh7786_pcie_hwops sh7786_65nm_pcie_hwops __initdata = {
393 .core_init = sh7786_pcie_core_init,
394 .port_init_hw = sh7786_pcie_init_hw,
397 static int __init sh7786_pcie_init(void)
401 printk(KERN_NOTICE "PCI: Starting intialization.\n");
403 sh7786_pcie_hwops = &sh7786_65nm_pcie_hwops;
405 nr_ports = sh7786_pcie_hwops->core_init();
406 BUG_ON(nr_ports > ARRAY_SIZE(sh7786_pci_channels));
408 if (unlikely(nr_ports == 0))
411 sh7786_pcie_ports = kzalloc(nr_ports * sizeof(struct sh7786_pcie_port),
413 if (unlikely(!sh7786_pcie_ports))
416 printk(KERN_NOTICE "PCI: probing %d ports.\n", nr_ports);
418 for (i = 0; i < nr_ports; i++) {
419 struct sh7786_pcie_port *port = sh7786_pcie_ports + i;
422 port->hose = sh7786_pci_channels + i;
423 port->hose->io_map_base = port->hose->resources[0].start;
425 ret |= sh7786_pcie_hwops->port_init_hw(port);
433 arch_initcall(sh7786_pcie_init);