Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Lennert Buytenhek | fa87ced | 2005-11-01 19:44:27 +0000 | [diff] [blame] | 2 | * arch/arm/mach-ixp2000/core.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Common routines used by all IXP2400/2800 based platforms. |
| 5 | * |
| 6 | * Author: Deepak Saxena <dsaxena@plexity.net> |
| 7 | * |
| 8 | * Copyright 2004 (C) MontaVista Software, Inc. |
| 9 | * |
| 10 | * Based on work Copyright (C) 2002-2003 Intel Corporation |
| 11 | * |
| 12 | * This file is licensed under the terms of the GNU General Public |
| 13 | * License version 2. This program is licensed "as is" without any |
| 14 | * warranty of any kind, whether express or implied. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/config.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/spinlock.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/serial.h> |
| 24 | #include <linux/tty.h> |
| 25 | #include <linux/bitops.h> |
Lennert Buytenhek | 28187f2 | 2005-07-10 19:44:53 +0100 | [diff] [blame] | 26 | #include <linux/serial_8250.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/mm.h> |
| 28 | |
| 29 | #include <asm/types.h> |
| 30 | #include <asm/setup.h> |
| 31 | #include <asm/memory.h> |
| 32 | #include <asm/hardware.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <asm/irq.h> |
| 34 | #include <asm/system.h> |
| 35 | #include <asm/tlbflush.h> |
| 36 | #include <asm/pgtable.h> |
| 37 | |
| 38 | #include <asm/mach/map.h> |
| 39 | #include <asm/mach/time.h> |
| 40 | #include <asm/mach/irq.h> |
| 41 | |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 42 | #include <asm/arch/gpio.h> |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | static DEFINE_SPINLOCK(ixp2000_slowport_lock); |
| 45 | static unsigned long ixp2000_slowport_irq_flags; |
| 46 | |
| 47 | /************************************************************************* |
| 48 | * Slowport access routines |
| 49 | *************************************************************************/ |
| 50 | void ixp2000_acquire_slowport(struct slowport_cfg *new_cfg, struct slowport_cfg *old_cfg) |
| 51 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | spin_lock_irqsave(&ixp2000_slowport_lock, ixp2000_slowport_irq_flags); |
| 53 | |
| 54 | old_cfg->CCR = *IXP2000_SLOWPORT_CCR; |
| 55 | old_cfg->WTC = *IXP2000_SLOWPORT_WTC2; |
| 56 | old_cfg->RTC = *IXP2000_SLOWPORT_RTC2; |
| 57 | old_cfg->PCR = *IXP2000_SLOWPORT_PCR; |
| 58 | old_cfg->ADC = *IXP2000_SLOWPORT_ADC; |
| 59 | |
| 60 | ixp2000_reg_write(IXP2000_SLOWPORT_CCR, new_cfg->CCR); |
| 61 | ixp2000_reg_write(IXP2000_SLOWPORT_WTC2, new_cfg->WTC); |
| 62 | ixp2000_reg_write(IXP2000_SLOWPORT_RTC2, new_cfg->RTC); |
| 63 | ixp2000_reg_write(IXP2000_SLOWPORT_PCR, new_cfg->PCR); |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 64 | ixp2000_reg_wrb(IXP2000_SLOWPORT_ADC, new_cfg->ADC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | } |
| 66 | |
| 67 | void ixp2000_release_slowport(struct slowport_cfg *old_cfg) |
| 68 | { |
| 69 | ixp2000_reg_write(IXP2000_SLOWPORT_CCR, old_cfg->CCR); |
| 70 | ixp2000_reg_write(IXP2000_SLOWPORT_WTC2, old_cfg->WTC); |
| 71 | ixp2000_reg_write(IXP2000_SLOWPORT_RTC2, old_cfg->RTC); |
| 72 | ixp2000_reg_write(IXP2000_SLOWPORT_PCR, old_cfg->PCR); |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 73 | ixp2000_reg_wrb(IXP2000_SLOWPORT_ADC, old_cfg->ADC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
| 75 | spin_unlock_irqrestore(&ixp2000_slowport_lock, |
| 76 | ixp2000_slowport_irq_flags); |
| 77 | } |
| 78 | |
| 79 | /************************************************************************* |
| 80 | * Chip specific mappings shared by all IXP2000 systems |
| 81 | *************************************************************************/ |
| 82 | static struct map_desc ixp2000_io_desc[] __initdata = { |
| 83 | { |
| 84 | .virtual = IXP2000_CAP_VIRT_BASE, |
Deepak Saxena | db0d087 | 2005-10-28 15:18:58 +0100 | [diff] [blame] | 85 | .pfn = __phys_to_pfn(IXP2000_CAP_PHYS_BASE), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | .length = IXP2000_CAP_SIZE, |
Lennert Buytenhek | 5391473 | 2005-11-07 21:12:09 +0000 | [diff] [blame] | 87 | .type = MT_IXP2000_DEVICE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | }, { |
| 89 | .virtual = IXP2000_INTCTL_VIRT_BASE, |
Deepak Saxena | db0d087 | 2005-10-28 15:18:58 +0100 | [diff] [blame] | 90 | .pfn = __phys_to_pfn(IXP2000_INTCTL_PHYS_BASE), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | .length = IXP2000_INTCTL_SIZE, |
Lennert Buytenhek | 5391473 | 2005-11-07 21:12:09 +0000 | [diff] [blame] | 92 | .type = MT_IXP2000_DEVICE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | }, { |
| 94 | .virtual = IXP2000_PCI_CREG_VIRT_BASE, |
Deepak Saxena | db0d087 | 2005-10-28 15:18:58 +0100 | [diff] [blame] | 95 | .pfn = __phys_to_pfn(IXP2000_PCI_CREG_PHYS_BASE), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | .length = IXP2000_PCI_CREG_SIZE, |
Lennert Buytenhek | 5391473 | 2005-11-07 21:12:09 +0000 | [diff] [blame] | 97 | .type = MT_IXP2000_DEVICE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | }, { |
| 99 | .virtual = IXP2000_PCI_CSR_VIRT_BASE, |
Deepak Saxena | db0d087 | 2005-10-28 15:18:58 +0100 | [diff] [blame] | 100 | .pfn = __phys_to_pfn(IXP2000_PCI_CSR_PHYS_BASE), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | .length = IXP2000_PCI_CSR_SIZE, |
Lennert Buytenhek | 5391473 | 2005-11-07 21:12:09 +0000 | [diff] [blame] | 102 | .type = MT_IXP2000_DEVICE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | }, { |
Lennert Buytenhek | baaf7ed | 2005-06-26 22:24:17 +0100 | [diff] [blame] | 104 | .virtual = IXP2000_MSF_VIRT_BASE, |
Deepak Saxena | db0d087 | 2005-10-28 15:18:58 +0100 | [diff] [blame] | 105 | .pfn = __phys_to_pfn(IXP2000_MSF_PHYS_BASE), |
Lennert Buytenhek | baaf7ed | 2005-06-26 22:24:17 +0100 | [diff] [blame] | 106 | .length = IXP2000_MSF_SIZE, |
Lennert Buytenhek | 5391473 | 2005-11-07 21:12:09 +0000 | [diff] [blame] | 107 | .type = MT_IXP2000_DEVICE, |
Lennert Buytenhek | baaf7ed | 2005-06-26 22:24:17 +0100 | [diff] [blame] | 108 | }, { |
Lennert Buytenhek | dd29c72 | 2006-01-13 20:51:43 +0000 | [diff] [blame] | 109 | .virtual = IXP2000_SCRATCH_RING_VIRT_BASE, |
| 110 | .pfn = __phys_to_pfn(IXP2000_SCRATCH_RING_PHYS_BASE), |
| 111 | .length = IXP2000_SCRATCH_RING_SIZE, |
| 112 | .type = MT_IXP2000_DEVICE, |
| 113 | }, { |
| 114 | .virtual = IXP2000_SRAM0_VIRT_BASE, |
| 115 | .pfn = __phys_to_pfn(IXP2000_SRAM0_PHYS_BASE), |
| 116 | .length = IXP2000_SRAM0_SIZE, |
| 117 | .type = MT_IXP2000_DEVICE, |
| 118 | }, { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | .virtual = IXP2000_PCI_IO_VIRT_BASE, |
Deepak Saxena | db0d087 | 2005-10-28 15:18:58 +0100 | [diff] [blame] | 120 | .pfn = __phys_to_pfn(IXP2000_PCI_IO_PHYS_BASE), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | .length = IXP2000_PCI_IO_SIZE, |
Lennert Buytenhek | 5391473 | 2005-11-07 21:12:09 +0000 | [diff] [blame] | 122 | .type = MT_IXP2000_DEVICE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | }, { |
| 124 | .virtual = IXP2000_PCI_CFG0_VIRT_BASE, |
Deepak Saxena | db0d087 | 2005-10-28 15:18:58 +0100 | [diff] [blame] | 125 | .pfn = __phys_to_pfn(IXP2000_PCI_CFG0_PHYS_BASE), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | .length = IXP2000_PCI_CFG0_SIZE, |
Lennert Buytenhek | 5391473 | 2005-11-07 21:12:09 +0000 | [diff] [blame] | 127 | .type = MT_IXP2000_DEVICE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | }, { |
| 129 | .virtual = IXP2000_PCI_CFG1_VIRT_BASE, |
Deepak Saxena | db0d087 | 2005-10-28 15:18:58 +0100 | [diff] [blame] | 130 | .pfn = __phys_to_pfn(IXP2000_PCI_CFG1_PHYS_BASE), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | .length = IXP2000_PCI_CFG1_SIZE, |
Lennert Buytenhek | 5391473 | 2005-11-07 21:12:09 +0000 | [diff] [blame] | 132 | .type = MT_IXP2000_DEVICE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | } |
| 134 | }; |
| 135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | void __init ixp2000_map_io(void) |
| 137 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /* |
Lennert Buytenhek | 5391473 | 2005-11-07 21:12:09 +0000 | [diff] [blame] | 139 | * On IXP2400 CPUs we need to use MT_IXP2000_DEVICE so that |
| 140 | * XCB=101 (to avoid triggering erratum #66), and given that |
| 141 | * this mode speeds up I/O accesses and we have write buffer |
| 142 | * flushes in the right places anyway, it doesn't hurt to use |
| 143 | * XCB=101 for all IXP2000s. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | iotable_init(ixp2000_io_desc, ARRAY_SIZE(ixp2000_io_desc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
| 147 | /* Set slowport to 8-bit mode. */ |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 148 | ixp2000_reg_wrb(IXP2000_SLOWPORT_FRM, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Lennert Buytenhek | 28187f2 | 2005-07-10 19:44:53 +0100 | [diff] [blame] | 151 | |
| 152 | /************************************************************************* |
| 153 | * Serial port support for IXP2000 |
| 154 | *************************************************************************/ |
| 155 | static struct plat_serial8250_port ixp2000_serial_port[] = { |
| 156 | { |
| 157 | .mapbase = IXP2000_UART_PHYS_BASE, |
| 158 | .membase = (char *)(IXP2000_UART_VIRT_BASE + 3), |
| 159 | .irq = IRQ_IXP2000_UART, |
| 160 | .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST, |
| 161 | .iotype = UPIO_MEM, |
| 162 | .regshift = 2, |
| 163 | .uartclk = 50000000, |
| 164 | }, |
| 165 | { }, |
| 166 | }; |
| 167 | |
| 168 | static struct resource ixp2000_uart_resource = { |
| 169 | .start = IXP2000_UART_PHYS_BASE, |
Deepak Saxena | 702c96d5 | 2005-09-30 16:20:22 -0700 | [diff] [blame] | 170 | .end = IXP2000_UART_PHYS_BASE + 0x1f, |
Lennert Buytenhek | 28187f2 | 2005-07-10 19:44:53 +0100 | [diff] [blame] | 171 | .flags = IORESOURCE_MEM, |
| 172 | }; |
| 173 | |
| 174 | static struct platform_device ixp2000_serial_device = { |
| 175 | .name = "serial8250", |
Russell King | 6df29de | 2005-09-08 16:04:41 +0100 | [diff] [blame] | 176 | .id = PLAT8250_DEV_PLATFORM, |
Lennert Buytenhek | 28187f2 | 2005-07-10 19:44:53 +0100 | [diff] [blame] | 177 | .dev = { |
| 178 | .platform_data = ixp2000_serial_port, |
| 179 | }, |
| 180 | .num_resources = 1, |
| 181 | .resource = &ixp2000_uart_resource, |
| 182 | }; |
| 183 | |
| 184 | void __init ixp2000_uart_init(void) |
| 185 | { |
| 186 | platform_device_register(&ixp2000_serial_device); |
| 187 | } |
| 188 | |
| 189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | /************************************************************************* |
| 191 | * Timer-tick functions for IXP2000 |
| 192 | *************************************************************************/ |
| 193 | static unsigned ticks_per_jiffy; |
| 194 | static unsigned ticks_per_usec; |
| 195 | static unsigned next_jiffy_time; |
Lennert Buytenhek | e4fe198 | 2005-06-20 18:51:07 +0100 | [diff] [blame] | 196 | static volatile unsigned long *missing_jiffy_timer_csr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
| 198 | unsigned long ixp2000_gettimeoffset (void) |
| 199 | { |
| 200 | unsigned long offset; |
| 201 | |
Lennert Buytenhek | e4fe198 | 2005-06-20 18:51:07 +0100 | [diff] [blame] | 202 | offset = next_jiffy_time - *missing_jiffy_timer_csr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
| 204 | return offset / ticks_per_usec; |
| 205 | } |
| 206 | |
| 207 | static int ixp2000_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| 208 | { |
| 209 | write_seqlock(&xtime_lock); |
| 210 | |
| 211 | /* clear timer 1 */ |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 212 | ixp2000_reg_wrb(IXP2000_T1_CLR, 1); |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 213 | |
Lennert Buytenhek | f869afa | 2006-06-22 10:30:53 +0100 | [diff] [blame^] | 214 | while ((signed long)(next_jiffy_time - *missing_jiffy_timer_csr) |
| 215 | >= ticks_per_jiffy) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | timer_tick(regs); |
| 217 | next_jiffy_time -= ticks_per_jiffy; |
| 218 | } |
| 219 | |
| 220 | write_sequnlock(&xtime_lock); |
| 221 | |
| 222 | return IRQ_HANDLED; |
| 223 | } |
| 224 | |
| 225 | static struct irqaction ixp2000_timer_irq = { |
| 226 | .name = "IXP2000 Timer Tick", |
Russell King | 09b8b5f | 2005-06-26 17:06:36 +0100 | [diff] [blame] | 227 | .flags = SA_INTERRUPT | SA_TIMER, |
| 228 | .handler = ixp2000_timer_interrupt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | }; |
| 230 | |
| 231 | void __init ixp2000_init_time(unsigned long tick_rate) |
| 232 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | ticks_per_jiffy = (tick_rate + HZ/2) / HZ; |
| 234 | ticks_per_usec = tick_rate / 1000000; |
| 235 | |
Lennert Buytenhek | e4fe198 | 2005-06-20 18:51:07 +0100 | [diff] [blame] | 236 | /* |
| 237 | * We use timer 1 as our timer interrupt. |
| 238 | */ |
| 239 | ixp2000_reg_write(IXP2000_T1_CLR, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | ixp2000_reg_write(IXP2000_T1_CLD, ticks_per_jiffy - 1); |
| 241 | ixp2000_reg_write(IXP2000_T1_CTL, (1 << 7)); |
| 242 | |
| 243 | /* |
Lennert Buytenhek | e4fe198 | 2005-06-20 18:51:07 +0100 | [diff] [blame] | 244 | * We use a second timer as a monotonic counter for tracking |
| 245 | * missed jiffies. The IXP2000 has four timers, but if we're |
| 246 | * on an A-step IXP2800, timer 2 and 3 don't work, so on those |
| 247 | * chips we use timer 4. Timer 4 is the only timer that can |
| 248 | * be used for the watchdog, so we use timer 2 if we're on a |
| 249 | * non-buggy chip. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | */ |
Lennert Buytenhek | e4fe198 | 2005-06-20 18:51:07 +0100 | [diff] [blame] | 251 | if ((*IXP2000_PRODUCT_ID & 0x001ffef0) == 0x00000000) { |
| 252 | printk(KERN_INFO "Enabling IXP2800 erratum #25 workaround\n"); |
| 253 | |
| 254 | ixp2000_reg_write(IXP2000_T4_CLR, 0); |
| 255 | ixp2000_reg_write(IXP2000_T4_CLD, -1); |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 256 | ixp2000_reg_wrb(IXP2000_T4_CTL, (1 << 7)); |
Lennert Buytenhek | e4fe198 | 2005-06-20 18:51:07 +0100 | [diff] [blame] | 257 | missing_jiffy_timer_csr = IXP2000_T4_CSR; |
| 258 | } else { |
| 259 | ixp2000_reg_write(IXP2000_T2_CLR, 0); |
| 260 | ixp2000_reg_write(IXP2000_T2_CLD, -1); |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 261 | ixp2000_reg_wrb(IXP2000_T2_CTL, (1 << 7)); |
Lennert Buytenhek | e4fe198 | 2005-06-20 18:51:07 +0100 | [diff] [blame] | 262 | missing_jiffy_timer_csr = IXP2000_T2_CSR; |
| 263 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | next_jiffy_time = 0xffffffff; |
| 265 | |
| 266 | /* register for interrupt */ |
| 267 | setup_irq(IRQ_IXP2000_TIMER1, &ixp2000_timer_irq); |
| 268 | } |
| 269 | |
| 270 | /************************************************************************* |
| 271 | * GPIO helpers |
| 272 | *************************************************************************/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | static unsigned long GPIO_IRQ_falling_edge; |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 274 | static unsigned long GPIO_IRQ_rising_edge; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | static unsigned long GPIO_IRQ_level_low; |
| 276 | static unsigned long GPIO_IRQ_level_high; |
| 277 | |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 278 | static void update_gpio_int_csrs(void) |
| 279 | { |
| 280 | ixp2000_reg_write(IXP2000_GPIO_FEDR, GPIO_IRQ_falling_edge); |
| 281 | ixp2000_reg_write(IXP2000_GPIO_REDR, GPIO_IRQ_rising_edge); |
| 282 | ixp2000_reg_write(IXP2000_GPIO_LSLR, GPIO_IRQ_level_low); |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 283 | ixp2000_reg_wrb(IXP2000_GPIO_LSHR, GPIO_IRQ_level_high); |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 284 | } |
| 285 | |
| 286 | void gpio_line_config(int line, int direction) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | { |
| 288 | unsigned long flags; |
| 289 | |
| 290 | local_irq_save(flags); |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 291 | if (direction == GPIO_OUT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | /* if it's an output, it ain't an interrupt anymore */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | GPIO_IRQ_falling_edge &= ~(1 << line); |
| 294 | GPIO_IRQ_rising_edge &= ~(1 << line); |
| 295 | GPIO_IRQ_level_low &= ~(1 << line); |
| 296 | GPIO_IRQ_level_high &= ~(1 << line); |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 297 | update_gpio_int_csrs(); |
| 298 | |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 299 | ixp2000_reg_wrb(IXP2000_GPIO_PDSR, 1 << line); |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 300 | } else if (direction == GPIO_IN) { |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 301 | ixp2000_reg_wrb(IXP2000_GPIO_PDCR, 1 << line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | local_irq_restore(flags); |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 304 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | |
| 307 | /************************************************************************* |
| 308 | * IRQ handling IXP2000 |
| 309 | *************************************************************************/ |
| 310 | static void ixp2000_GPIO_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) |
| 311 | { |
| 312 | int i; |
| 313 | unsigned long status = *IXP2000_GPIO_INST; |
| 314 | |
| 315 | for (i = 0; i <= 7; i++) { |
| 316 | if (status & (1<<i)) { |
| 317 | desc = irq_desc + i + IRQ_IXP2000_GPIO0; |
Russell King | 664399e | 2005-09-04 19:45:00 +0100 | [diff] [blame] | 318 | desc_handle_irq(i + IRQ_IXP2000_GPIO0, desc, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } |
| 320 | } |
| 321 | } |
| 322 | |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 323 | static int ixp2000_GPIO_irq_type(unsigned int irq, unsigned int type) |
| 324 | { |
| 325 | int line = irq - IRQ_IXP2000_GPIO0; |
| 326 | |
| 327 | /* |
| 328 | * First, configure this GPIO line as an input. |
| 329 | */ |
| 330 | ixp2000_reg_write(IXP2000_GPIO_PDCR, 1 << line); |
| 331 | |
| 332 | /* |
| 333 | * Then, set the proper trigger type. |
| 334 | */ |
| 335 | if (type & IRQT_FALLING) |
| 336 | GPIO_IRQ_falling_edge |= 1 << line; |
| 337 | else |
| 338 | GPIO_IRQ_falling_edge &= ~(1 << line); |
| 339 | if (type & IRQT_RISING) |
| 340 | GPIO_IRQ_rising_edge |= 1 << line; |
| 341 | else |
| 342 | GPIO_IRQ_rising_edge &= ~(1 << line); |
| 343 | if (type & IRQT_LOW) |
| 344 | GPIO_IRQ_level_low |= 1 << line; |
| 345 | else |
| 346 | GPIO_IRQ_level_low &= ~(1 << line); |
| 347 | if (type & IRQT_HIGH) |
| 348 | GPIO_IRQ_level_high |= 1 << line; |
| 349 | else |
| 350 | GPIO_IRQ_level_high &= ~(1 << line); |
| 351 | update_gpio_int_csrs(); |
| 352 | |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 353 | return 0; |
| 354 | } |
| 355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | static void ixp2000_GPIO_irq_mask_ack(unsigned int irq) |
| 357 | { |
| 358 | ixp2000_reg_write(IXP2000_GPIO_INCR, (1 << (irq - IRQ_IXP2000_GPIO0))); |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 359 | |
| 360 | ixp2000_reg_write(IXP2000_GPIO_EDSR, (1 << (irq - IRQ_IXP2000_GPIO0))); |
| 361 | ixp2000_reg_write(IXP2000_GPIO_LDSR, (1 << (irq - IRQ_IXP2000_GPIO0))); |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 362 | ixp2000_reg_wrb(IXP2000_GPIO_INST, (1 << (irq - IRQ_IXP2000_GPIO0))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | static void ixp2000_GPIO_irq_mask(unsigned int irq) |
| 366 | { |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 367 | ixp2000_reg_wrb(IXP2000_GPIO_INCR, (1 << (irq - IRQ_IXP2000_GPIO0))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | static void ixp2000_GPIO_irq_unmask(unsigned int irq) |
| 371 | { |
| 372 | ixp2000_reg_write(IXP2000_GPIO_INSR, (1 << (irq - IRQ_IXP2000_GPIO0))); |
| 373 | } |
| 374 | |
| 375 | static struct irqchip ixp2000_GPIO_irq_chip = { |
Russell King | 7801907 | 2005-09-04 19:43:13 +0100 | [diff] [blame] | 376 | .ack = ixp2000_GPIO_irq_mask_ack, |
| 377 | .mask = ixp2000_GPIO_irq_mask, |
Russell King | 2be863c | 2005-09-06 23:13:17 +0100 | [diff] [blame] | 378 | .unmask = ixp2000_GPIO_irq_unmask, |
Russell King | 7801907 | 2005-09-04 19:43:13 +0100 | [diff] [blame] | 379 | .set_type = ixp2000_GPIO_irq_type, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | }; |
| 381 | |
| 382 | static void ixp2000_pci_irq_mask(unsigned int irq) |
| 383 | { |
| 384 | unsigned long temp = *IXP2000_PCI_XSCALE_INT_ENABLE; |
| 385 | if (irq == IRQ_IXP2000_PCIA) |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 386 | ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, (temp & ~(1 << 26))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | else if (irq == IRQ_IXP2000_PCIB) |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 388 | ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, (temp & ~(1 << 27))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | static void ixp2000_pci_irq_unmask(unsigned int irq) |
| 392 | { |
| 393 | unsigned long temp = *IXP2000_PCI_XSCALE_INT_ENABLE; |
| 394 | if (irq == IRQ_IXP2000_PCIA) |
| 395 | ixp2000_reg_write(IXP2000_PCI_XSCALE_INT_ENABLE, (temp | (1 << 26))); |
| 396 | else if (irq == IRQ_IXP2000_PCIB) |
| 397 | ixp2000_reg_write(IXP2000_PCI_XSCALE_INT_ENABLE, (temp | (1 << 27))); |
| 398 | } |
| 399 | |
Dave Jiang | 7866f64 | 2005-11-04 17:15:44 +0000 | [diff] [blame] | 400 | /* |
| 401 | * Error interrupts. These are used extensively by the microengine drivers |
| 402 | */ |
| 403 | static void ixp2000_err_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) |
| 404 | { |
| 405 | int i; |
| 406 | unsigned long status = *IXP2000_IRQ_ERR_STATUS; |
| 407 | |
| 408 | for(i = 31; i >= 0; i--) { |
| 409 | if(status & (1 << i)) { |
| 410 | desc = irq_desc + IRQ_IXP2000_DRAM0_MIN_ERR + i; |
| 411 | desc->handle(IRQ_IXP2000_DRAM0_MIN_ERR + i, desc, regs); |
| 412 | } |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | static void ixp2000_err_irq_mask(unsigned int irq) |
| 417 | { |
| 418 | ixp2000_reg_write(IXP2000_IRQ_ERR_ENABLE_CLR, |
| 419 | (1 << (irq - IRQ_IXP2000_DRAM0_MIN_ERR))); |
| 420 | } |
| 421 | |
| 422 | static void ixp2000_err_irq_unmask(unsigned int irq) |
| 423 | { |
| 424 | ixp2000_reg_write(IXP2000_IRQ_ERR_ENABLE_SET, |
| 425 | (1 << (irq - IRQ_IXP2000_DRAM0_MIN_ERR))); |
| 426 | } |
| 427 | |
| 428 | static struct irqchip ixp2000_err_irq_chip = { |
| 429 | .ack = ixp2000_err_irq_mask, |
| 430 | .mask = ixp2000_err_irq_mask, |
| 431 | .unmask = ixp2000_err_irq_unmask |
| 432 | }; |
| 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | static struct irqchip ixp2000_pci_irq_chip = { |
| 435 | .ack = ixp2000_pci_irq_mask, |
| 436 | .mask = ixp2000_pci_irq_mask, |
| 437 | .unmask = ixp2000_pci_irq_unmask |
| 438 | }; |
| 439 | |
| 440 | static void ixp2000_irq_mask(unsigned int irq) |
| 441 | { |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 442 | ixp2000_reg_wrb(IXP2000_IRQ_ENABLE_CLR, (1 << irq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | static void ixp2000_irq_unmask(unsigned int irq) |
| 446 | { |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 447 | ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << irq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | static struct irqchip ixp2000_irq_chip = { |
| 451 | .ack = ixp2000_irq_mask, |
| 452 | .mask = ixp2000_irq_mask, |
| 453 | .unmask = ixp2000_irq_unmask |
| 454 | }; |
| 455 | |
| 456 | void __init ixp2000_init_irq(void) |
| 457 | { |
| 458 | int irq; |
| 459 | |
| 460 | /* |
| 461 | * Mask all sources |
| 462 | */ |
| 463 | ixp2000_reg_write(IXP2000_IRQ_ENABLE_CLR, 0xffffffff); |
| 464 | ixp2000_reg_write(IXP2000_FIQ_ENABLE_CLR, 0xffffffff); |
| 465 | |
| 466 | /* clear all GPIO edge/level detects */ |
| 467 | ixp2000_reg_write(IXP2000_GPIO_REDR, 0); |
| 468 | ixp2000_reg_write(IXP2000_GPIO_FEDR, 0); |
| 469 | ixp2000_reg_write(IXP2000_GPIO_LSHR, 0); |
| 470 | ixp2000_reg_write(IXP2000_GPIO_LSLR, 0); |
| 471 | ixp2000_reg_write(IXP2000_GPIO_INCR, -1); |
| 472 | |
| 473 | /* clear PCI interrupt sources */ |
Lennert Buytenhek | e9b72e4 | 2005-11-01 19:44:26 +0000 | [diff] [blame] | 474 | ixp2000_reg_wrb(IXP2000_PCI_XSCALE_INT_ENABLE, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
| 476 | /* |
| 477 | * Certain bits in the IRQ status register of the |
| 478 | * IXP2000 are reserved. Instead of trying to map |
| 479 | * things non 1:1 from bit position to IRQ number, |
| 480 | * we mark the reserved IRQs as invalid. This makes |
| 481 | * our mask/unmask code much simpler. |
| 482 | */ |
| 483 | for (irq = IRQ_IXP2000_SOFT_INT; irq <= IRQ_IXP2000_THDB3; irq++) { |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 484 | if ((1 << irq) & IXP2000_VALID_IRQ_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | set_irq_chip(irq, &ixp2000_irq_chip); |
| 486 | set_irq_handler(irq, do_level_IRQ); |
| 487 | set_irq_flags(irq, IRQF_VALID); |
| 488 | } else set_irq_flags(irq, 0); |
| 489 | } |
Lennert Buytenhek | c498288 | 2005-06-24 20:54:35 +0100 | [diff] [blame] | 490 | |
Dave Jiang | 7866f64 | 2005-11-04 17:15:44 +0000 | [diff] [blame] | 491 | for (irq = IRQ_IXP2000_DRAM0_MIN_ERR; irq <= IRQ_IXP2000_SP_INT; irq++) { |
| 492 | if((1 << (irq - IRQ_IXP2000_DRAM0_MIN_ERR)) & |
| 493 | IXP2000_VALID_ERR_IRQ_MASK) { |
| 494 | set_irq_chip(irq, &ixp2000_err_irq_chip); |
| 495 | set_irq_handler(irq, do_level_IRQ); |
| 496 | set_irq_flags(irq, IRQF_VALID); |
| 497 | } |
| 498 | else |
| 499 | set_irq_flags(irq, 0); |
| 500 | } |
| 501 | set_irq_chained_handler(IRQ_IXP2000_ERRSUM, ixp2000_err_irq_handler); |
| 502 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | for (irq = IRQ_IXP2000_GPIO0; irq <= IRQ_IXP2000_GPIO7; irq++) { |
| 504 | set_irq_chip(irq, &ixp2000_GPIO_irq_chip); |
| 505 | set_irq_handler(irq, do_level_IRQ); |
Lennert Buytenhek | bd115ea | 2006-03-22 20:14:09 +0000 | [diff] [blame] | 506 | set_irq_flags(irq, IRQF_VALID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | set_irq_chained_handler(IRQ_IXP2000_GPIO, ixp2000_GPIO_irq_handler); |
| 509 | |
| 510 | /* |
| 511 | * Enable PCI irqs. The actual PCI[AB] decoding is done in |
| 512 | * entry-macro.S, so we don't need a chained handler for the |
| 513 | * PCI interrupt source. |
| 514 | */ |
| 515 | ixp2000_reg_write(IXP2000_IRQ_ENABLE_SET, (1 << IRQ_IXP2000_PCI)); |
| 516 | for (irq = IRQ_IXP2000_PCIA; irq <= IRQ_IXP2000_PCIB; irq++) { |
| 517 | set_irq_chip(irq, &ixp2000_pci_irq_chip); |
| 518 | set_irq_handler(irq, do_level_IRQ); |
| 519 | set_irq_flags(irq, IRQF_VALID); |
| 520 | } |
| 521 | } |
| 522 | |