2 * arch/arm/plat-orion/pcie.c
4 * Marvell Orion SoC PCIe handling.
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
11 #include <linux/kernel.h>
12 #include <linux/pci.h>
13 #include <linux/mbus.h>
14 #include <asm/mach/pci.h>
15 #include <asm/plat-orion/pcie.h>
18 * PCIe unit register offsets.
20 #define PCIE_DEV_ID_OFF 0x0000
21 #define PCIE_CMD_OFF 0x0004
22 #define PCIE_DEV_REV_OFF 0x0008
23 #define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3))
24 #define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3))
25 #define PCIE_HEADER_LOG_4_OFF 0x0128
26 #define PCIE_BAR_CTRL_OFF(n) (0x1804 + ((n - 1) * 4))
27 #define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4))
28 #define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4))
29 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4))
30 #define PCIE_WIN5_CTRL_OFF 0x1880
31 #define PCIE_WIN5_BASE_OFF 0x1884
32 #define PCIE_WIN5_REMAP_OFF 0x188c
33 #define PCIE_CONF_ADDR_OFF 0x18f8
34 #define PCIE_CONF_ADDR_EN 0x80000000
35 #define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc))
36 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
37 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
38 #define PCIE_CONF_FUNC(f) (((f) & 0x3) << 8)
39 #define PCIE_CONF_DATA_OFF 0x18fc
40 #define PCIE_MASK_OFF 0x1910
41 #define PCIE_CTRL_OFF 0x1a00
42 #define PCIE_CTRL_X1_MODE 0x0001
43 #define PCIE_STAT_OFF 0x1a04
44 #define PCIE_STAT_DEV_OFFS 20
45 #define PCIE_STAT_DEV_MASK 0x1f
46 #define PCIE_STAT_BUS_OFFS 8
47 #define PCIE_STAT_BUS_MASK 0xff
48 #define PCIE_STAT_LINK_DOWN 1
51 u32 __init orion_pcie_dev_id(void __iomem *base)
53 return readl(base + PCIE_DEV_ID_OFF) >> 16;
56 u32 __init orion_pcie_rev(void __iomem *base)
58 return readl(base + PCIE_DEV_REV_OFF) & 0xff;
61 int orion_pcie_link_up(void __iomem *base)
63 return !(readl(base + PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN);
66 int __init orion_pcie_x4_mode(void __iomem *base)
68 return !(readl(base + PCIE_CTRL_OFF) & PCIE_CTRL_X1_MODE);
71 int orion_pcie_get_local_bus_nr(void __iomem *base)
73 u32 stat = readl(base + PCIE_STAT_OFF);
75 return (stat >> PCIE_STAT_BUS_OFFS) & PCIE_STAT_BUS_MASK;
78 void __init orion_pcie_set_local_bus_nr(void __iomem *base, int nr)
82 stat = readl(base + PCIE_STAT_OFF);
83 stat &= ~(PCIE_STAT_BUS_MASK << PCIE_STAT_BUS_OFFS);
84 stat |= nr << PCIE_STAT_BUS_OFFS;
85 writel(stat, base + PCIE_STAT_OFF);
89 * Setup PCIE BARs and Address Decode Wins:
90 * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
91 * WIN[0-3] -> DRAM bank[0-3]
93 static void __init orion_pcie_setup_wins(void __iomem *base,
94 struct mbus_dram_target_info *dram)
100 * First, disable and clear BARs and windows.
102 for (i = 1; i <= 2; i++) {
103 writel(0, base + PCIE_BAR_CTRL_OFF(i));
104 writel(0, base + PCIE_BAR_LO_OFF(i));
105 writel(0, base + PCIE_BAR_HI_OFF(i));
108 for (i = 0; i < 5; i++) {
109 writel(0, base + PCIE_WIN04_CTRL_OFF(i));
110 writel(0, base + PCIE_WIN04_BASE_OFF(i));
111 writel(0, base + PCIE_WIN04_REMAP_OFF(i));
114 writel(0, base + PCIE_WIN5_CTRL_OFF);
115 writel(0, base + PCIE_WIN5_BASE_OFF);
116 writel(0, base + PCIE_WIN5_REMAP_OFF);
119 * Setup windows for DDR banks. Count total DDR size on the fly.
122 for (i = 0; i < dram->num_cs; i++) {
123 struct mbus_dram_window *cs = dram->cs + i;
125 writel(cs->base & 0xffff0000, base + PCIE_WIN04_BASE_OFF(i));
126 writel(0, base + PCIE_WIN04_REMAP_OFF(i));
127 writel(((cs->size - 1) & 0xffff0000) |
128 (cs->mbus_attr << 8) |
129 (dram->mbus_dram_target_id << 4) | 1,
130 base + PCIE_WIN04_CTRL_OFF(i));
136 * Setup BAR[1] to all DRAM banks.
138 writel(dram->cs[0].base, base + PCIE_BAR_LO_OFF(1));
139 writel(0, base + PCIE_BAR_HI_OFF(1));
140 writel(((size - 1) & 0xffff0000) | 1, base + PCIE_BAR_CTRL_OFF(1));
143 void __init orion_pcie_setup(void __iomem *base,
144 struct mbus_dram_target_info *dram)
150 * Point PCIe unit MBUS decode windows to DRAM space.
152 orion_pcie_setup_wins(base, dram);
155 * Master + slave enable.
157 cmd = readw(base + PCIE_CMD_OFF);
158 cmd |= PCI_COMMAND_IO;
159 cmd |= PCI_COMMAND_MEMORY;
160 cmd |= PCI_COMMAND_MASTER;
161 writew(cmd, base + PCIE_CMD_OFF);
164 * Enable interrupt lines A-D.
166 mask = readl(base + PCIE_MASK_OFF);
168 writel(mask, base + PCIE_MASK_OFF);
171 int orion_pcie_rd_conf(void __iomem *base, struct pci_bus *bus,
172 u32 devfn, int where, int size, u32 *val)
174 writel(PCIE_CONF_BUS(bus->number) |
175 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
176 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
177 PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN,
178 base + PCIE_CONF_ADDR_OFF);
180 *val = readl(base + PCIE_CONF_DATA_OFF);
183 *val = (*val >> (8 * (where & 3))) & 0xff;
185 *val = (*val >> (8 * (where & 3))) & 0xffff;
187 return PCIBIOS_SUCCESSFUL;
190 int orion_pcie_rd_conf_tlp(void __iomem *base, struct pci_bus *bus,
191 u32 devfn, int where, int size, u32 *val)
193 writel(PCIE_CONF_BUS(bus->number) |
194 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
195 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
196 PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN,
197 base + PCIE_CONF_ADDR_OFF);
199 *val = readl(base + PCIE_CONF_DATA_OFF);
201 if (bus->number != orion_pcie_get_local_bus_nr(base) ||
202 PCI_FUNC(devfn) != 0)
203 *val = readl(base + PCIE_HEADER_LOG_4_OFF);
206 *val = (*val >> (8 * (where & 3))) & 0xff;
208 *val = (*val >> (8 * (where & 3))) & 0xffff;
210 return PCIBIOS_SUCCESSFUL;
213 int orion_pcie_rd_conf_wa(void __iomem *wa_base, struct pci_bus *bus,
214 u32 devfn, int where, int size, u32 *val)
216 *val = readl(wa_base + (PCIE_CONF_BUS(bus->number) |
217 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
218 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
219 PCIE_CONF_REG(where)));
222 *val = (*val >> (8 * (where & 3))) & 0xff;
224 *val = (*val >> (8 * (where & 3))) & 0xffff;
226 return PCIBIOS_SUCCESSFUL;
229 int orion_pcie_wr_conf(void __iomem *base, struct pci_bus *bus,
230 u32 devfn, int where, int size, u32 val)
232 int ret = PCIBIOS_SUCCESSFUL;
234 writel(PCIE_CONF_BUS(bus->number) |
235 PCIE_CONF_DEV(PCI_SLOT(devfn)) |
236 PCIE_CONF_FUNC(PCI_FUNC(devfn)) |
237 PCIE_CONF_REG(where) | PCIE_CONF_ADDR_EN,
238 base + PCIE_CONF_ADDR_OFF);
241 writel(val, base + PCIE_CONF_DATA_OFF);
242 } else if (size == 2) {
243 writew(val, base + PCIE_CONF_DATA_OFF + (where & 3));
244 } else if (size == 1) {
245 writeb(val, base + PCIE_CONF_DATA_OFF + (where & 3));
247 ret = PCIBIOS_BAD_REGISTER_NUMBER;