1 /* 2 * This program is free software; you can redistribute it and/or modify it 3 * under the terms of the GNU General Public License version 2 as published 4 * by the Free Software Foundation. 5 * 6 * Copyright (C) 2010 John Crispin <blogic@openwrt.org> 7 */ 8 9 #include <linux/types.h> 10 #include <linux/pci.h> 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/delay.h> 14 #include <linux/mm.h> 15 #include <linux/vmalloc.h> 16 #include <linux/module.h> 17 #include <linux/clk.h> 18 #include <linux/of_platform.h> 19 #include <linux/of_gpio.h> 20 #include <linux/of_irq.h> 21 #include <linux/of_pci.h> 22 23 #include <asm/pci.h> 24 #include <asm/gpio.h> 25 #include <asm/addrspace.h> 26 27 #include <lantiq_soc.h> 28 #include <lantiq_irq.h> 29 30 #include "pci-lantiq.h" 31 32 #define PCI_CR_FCI_ADDR_MAP0 0x00C0 33 #define PCI_CR_FCI_ADDR_MAP1 0x00C4 34 #define PCI_CR_FCI_ADDR_MAP2 0x00C8 35 #define PCI_CR_FCI_ADDR_MAP3 0x00CC 36 #define PCI_CR_FCI_ADDR_MAP4 0x00D0 37 #define PCI_CR_FCI_ADDR_MAP5 0x00D4 38 #define PCI_CR_FCI_ADDR_MAP6 0x00D8 39 #define PCI_CR_FCI_ADDR_MAP7 0x00DC 40 #define PCI_CR_CLK_CTRL 0x0000 41 #define PCI_CR_PCI_MOD 0x0030 42 #define PCI_CR_PC_ARB 0x0080 43 #define PCI_CR_FCI_ADDR_MAP11hg 0x00E4 44 #define PCI_CR_BAR11MASK 0x0044 45 #define PCI_CR_BAR12MASK 0x0048 46 #define PCI_CR_BAR13MASK 0x004C 47 #define PCI_CS_BASE_ADDR1 0x0010 48 #define PCI_CR_PCI_ADDR_MAP11 0x0064 49 #define PCI_CR_FCI_BURST_LENGTH 0x00E8 50 #define PCI_CR_PCI_EOI 0x002C 51 #define PCI_CS_STS_CMD 0x0004 52 53 #define PCI_MASTER0_REQ_MASK_2BITS 8 54 #define PCI_MASTER1_REQ_MASK_2BITS 10 55 #define PCI_MASTER2_REQ_MASK_2BITS 12 56 #define INTERNAL_ARB_ENABLE_BIT 0 57 58 #define LTQ_CGU_IFCCR 0x0018 59 #define LTQ_CGU_PCICR 0x0034 60 61 #define ltq_pci_w32(x, y) ltq_w32((x), ltq_pci_membase + (y)) 62 #define ltq_pci_r32(x) ltq_r32(ltq_pci_membase + (x)) 63 64 #define ltq_pci_cfg_w32(x, y) ltq_w32((x), ltq_pci_mapped_cfg + (y)) 65 #define ltq_pci_cfg_r32(x) ltq_r32(ltq_pci_mapped_cfg + (x)) 66 67 __iomem void *ltq_pci_mapped_cfg; 68 static __iomem void *ltq_pci_membase; 69 70 static int reset_gpio; 71 static struct clk *clk_pci, *clk_external; 72 static struct resource pci_io_resource; 73 static struct resource pci_mem_resource; 74 static struct pci_ops pci_ops = { 75 .read = ltq_pci_read_config_dword, 76 .write = ltq_pci_write_config_dword 77 }; 78 79 static struct pci_controller pci_controller = { 80 .pci_ops = &pci_ops, 81 .mem_resource = &pci_mem_resource, 82 .mem_offset = 0x00000000UL, 83 .io_resource = &pci_io_resource, 84 .io_offset = 0x00000000UL, 85 }; 86 87 static inline u32 ltq_calc_bar11mask(void) 88 { 89 u32 mem, bar11mask; 90 91 /* BAR11MASK value depends on available memory on system. */ 92 mem = get_num_physpages() * PAGE_SIZE; 93 bar11mask = (0x0ffffff0 & ~((1 << (fls(mem) - 1)) - 1)) | 8; 94 95 return bar11mask; 96 } 97 98 static int ltq_pci_startup(struct platform_device *pdev) 99 { 100 struct device_node *node = pdev->dev.of_node; 101 const __be32 *req_mask, *bus_clk; 102 u32 temp_buffer; 103 104 /* get our clocks */ 105 clk_pci = clk_get(&pdev->dev, NULL); 106 if (IS_ERR(clk_pci)) { 107 dev_err(&pdev->dev, "failed to get pci clock\n"); 108 return PTR_ERR(clk_pci); 109 } 110 111 clk_external = clk_get(&pdev->dev, "external"); 112 if (IS_ERR(clk_external)) { 113 clk_put(clk_pci); 114 dev_err(&pdev->dev, "failed to get external pci clock\n"); 115 return PTR_ERR(clk_external); 116 } 117 118 /* read the bus speed that we want */ 119 bus_clk = of_get_property(node, "lantiq,bus-clock", NULL); 120 if (bus_clk) 121 clk_set_rate(clk_pci, *bus_clk); 122 123 /* and enable the clocks */ 124 clk_enable(clk_pci); 125 if (of_find_property(node, "lantiq,external-clock", NULL)) 126 clk_enable(clk_external); 127 else 128 clk_disable(clk_external); 129 130 /* setup reset gpio used by pci */ 131 reset_gpio = of_get_named_gpio(node, "gpio-reset", 0); 132 if (gpio_is_valid(reset_gpio)) { 133 int ret = devm_gpio_request(&pdev->dev, 134 reset_gpio, "pci-reset"); 135 if (ret) { 136 dev_err(&pdev->dev, 137 "failed to request gpio %d\n", reset_gpio); 138 return ret; 139 } 140 gpio_direction_output(reset_gpio, 1); 141 } 142 143 /* enable auto-switching between PCI and EBU */ 144 ltq_pci_w32(0xa, PCI_CR_CLK_CTRL); 145 146 /* busy, i.e. configuration is not done, PCI access has to be retried */ 147 ltq_pci_w32(ltq_pci_r32(PCI_CR_PCI_MOD) & ~(1 << 24), PCI_CR_PCI_MOD); 148 wmb(); 149 /* BUS Master/IO/MEM access */ 150 ltq_pci_cfg_w32(ltq_pci_cfg_r32(PCI_CS_STS_CMD) | 7, PCI_CS_STS_CMD); 151 152 /* enable external 2 PCI masters */ 153 temp_buffer = ltq_pci_r32(PCI_CR_PC_ARB); 154 /* setup the request mask */ 155 req_mask = of_get_property(node, "req-mask", NULL); 156 if (req_mask) 157 temp_buffer &= ~((*req_mask & 0xf) << 16); 158 else 159 temp_buffer &= ~0xf0000; 160 /* enable internal arbiter */ 161 temp_buffer |= (1 << INTERNAL_ARB_ENABLE_BIT); 162 /* enable internal PCI master reqest */ 163 temp_buffer &= (~(3 << PCI_MASTER0_REQ_MASK_2BITS)); 164 165 /* enable EBU request */ 166 temp_buffer &= (~(3 << PCI_MASTER1_REQ_MASK_2BITS)); 167 168 /* enable all external masters request */ 169 temp_buffer &= (~(3 << PCI_MASTER2_REQ_MASK_2BITS)); 170 ltq_pci_w32(temp_buffer, PCI_CR_PC_ARB); 171 wmb(); 172 173 /* setup BAR memory regions */ 174 ltq_pci_w32(0x18000000, PCI_CR_FCI_ADDR_MAP0); 175 ltq_pci_w32(0x18400000, PCI_CR_FCI_ADDR_MAP1); 176 ltq_pci_w32(0x18800000, PCI_CR_FCI_ADDR_MAP2); 177 ltq_pci_w32(0x18c00000, PCI_CR_FCI_ADDR_MAP3); 178 ltq_pci_w32(0x19000000, PCI_CR_FCI_ADDR_MAP4); 179 ltq_pci_w32(0x19400000, PCI_CR_FCI_ADDR_MAP5); 180 ltq_pci_w32(0x19800000, PCI_CR_FCI_ADDR_MAP6); 181 ltq_pci_w32(0x19c00000, PCI_CR_FCI_ADDR_MAP7); 182 ltq_pci_w32(0x1ae00000, PCI_CR_FCI_ADDR_MAP11hg); 183 ltq_pci_w32(ltq_calc_bar11mask(), PCI_CR_BAR11MASK); 184 ltq_pci_w32(0, PCI_CR_PCI_ADDR_MAP11); 185 ltq_pci_w32(0, PCI_CS_BASE_ADDR1); 186 /* both TX and RX endian swap are enabled */ 187 ltq_pci_w32(ltq_pci_r32(PCI_CR_PCI_EOI) | 3, PCI_CR_PCI_EOI); 188 wmb(); 189 ltq_pci_w32(ltq_pci_r32(PCI_CR_BAR12MASK) | 0x80000000, 190 PCI_CR_BAR12MASK); 191 ltq_pci_w32(ltq_pci_r32(PCI_CR_BAR13MASK) | 0x80000000, 192 PCI_CR_BAR13MASK); 193 /*use 8 dw burst length */ 194 ltq_pci_w32(0x303, PCI_CR_FCI_BURST_LENGTH); 195 ltq_pci_w32(ltq_pci_r32(PCI_CR_PCI_MOD) | (1 << 24), PCI_CR_PCI_MOD); 196 wmb(); 197 198 /* setup irq line */ 199 ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_CON) | 0xc, LTQ_EBU_PCC_CON); 200 ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_IEN) | 0x10, LTQ_EBU_PCC_IEN); 201 202 /* toggle reset pin */ 203 if (gpio_is_valid(reset_gpio)) { 204 __gpio_set_value(reset_gpio, 0); 205 wmb(); 206 mdelay(1); 207 __gpio_set_value(reset_gpio, 1); 208 } 209 return 0; 210 } 211 212 static int ltq_pci_probe(struct platform_device *pdev) 213 { 214 struct resource *res_cfg, *res_bridge; 215 216 pci_clear_flags(PCI_PROBE_ONLY); 217 218 res_bridge = platform_get_resource(pdev, IORESOURCE_MEM, 1); 219 ltq_pci_membase = devm_ioremap_resource(&pdev->dev, res_bridge); 220 if (IS_ERR(ltq_pci_membase)) 221 return PTR_ERR(ltq_pci_membase); 222 223 res_cfg = platform_get_resource(pdev, IORESOURCE_MEM, 0); 224 ltq_pci_mapped_cfg = devm_ioremap_resource(&pdev->dev, res_cfg); 225 if (IS_ERR(ltq_pci_mapped_cfg)) 226 return PTR_ERR(ltq_pci_mapped_cfg); 227 228 ltq_pci_startup(pdev); 229 230 pci_load_of_ranges(&pci_controller, pdev->dev.of_node); 231 register_pci_controller(&pci_controller); 232 return 0; 233 } 234 235 static const struct of_device_id ltq_pci_match[] = { 236 { .compatible = "lantiq,pci-xway" }, 237 {}, 238 }; 239 MODULE_DEVICE_TABLE(of, ltq_pci_match); 240 241 static struct platform_driver ltq_pci_driver = { 242 .probe = ltq_pci_probe, 243 .driver = { 244 .name = "pci-xway", 245 .of_match_table = ltq_pci_match, 246 }, 247 }; 248 249 int __init pcibios_init(void) 250 { 251 int ret = platform_driver_register(<q_pci_driver); 252 if (ret) 253 pr_info("pci-xway: Error registering platform driver!"); 254 return ret; 255 } 256 257 arch_initcall(pcibios_init); 258