Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mach-integrator/core.c |
| 3 | * |
| 4 | * Copyright (C) 2000-2003 Deep Blue Solutions Ltd |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2, as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/spinlock.h> |
| 15 | #include <linux/interrupt.h> |
Thomas Gleixner | a03d4d2 | 2006-07-01 22:32:32 +0100 | [diff] [blame] | 16 | #include <linux/irq.h> |
Russell King | 8d717a5 | 2010-05-22 19:47:18 +0100 | [diff] [blame] | 17 | #include <linux/memblock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/sched.h> |
Russell King | 20cf33e | 2005-06-18 10:15:46 +0100 | [diff] [blame] | 19 | #include <linux/smp.h> |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 20 | #include <linux/termios.h> |
Russell King | a62c80e | 2006-01-07 13:52:45 +0000 | [diff] [blame] | 21 | #include <linux/amba/bus.h> |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 22 | #include <linux/amba/serial.h> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 23 | #include <linux/io.h> |
Jean-Christop PLAGNIOL-VILLARD | 6d803ba | 2010-11-17 10:04:33 +0100 | [diff] [blame] | 24 | #include <linux/clkdev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 26 | #include <mach/hardware.h> |
Russell King | a285edc | 2010-01-14 19:59:37 +0000 | [diff] [blame] | 27 | #include <mach/platform.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <asm/irq.h> |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 29 | #include <mach/cm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/system.h> |
| 31 | #include <asm/leds.h> |
Linus Walleij | ee35887 | 2011-12-20 11:55:19 +0100 | [diff] [blame] | 32 | #include <asm/mach-types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <asm/mach/time.h> |
Russell King | 98c672c | 2010-05-22 18:18:57 +0100 | [diff] [blame] | 34 | #include <asm/pgtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 36 | static struct amba_pl010_data integrator_uart_data; |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | static struct amba_device rtc_device = { |
| 39 | .dev = { |
Kay Sievers | 1d559e2 | 2009-01-06 10:44:43 -0800 | [diff] [blame] | 40 | .init_name = "mb:15", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | }, |
| 42 | .res = { |
| 43 | .start = INTEGRATOR_RTC_BASE, |
| 44 | .end = INTEGRATOR_RTC_BASE + SZ_4K - 1, |
| 45 | .flags = IORESOURCE_MEM, |
| 46 | }, |
Russell King | 0dada61 | 2011-12-18 11:40:46 +0000 | [diff] [blame^] | 47 | .irq = { IRQ_RTCINT }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | }; |
| 49 | |
| 50 | static struct amba_device uart0_device = { |
| 51 | .dev = { |
Kay Sievers | 1d559e2 | 2009-01-06 10:44:43 -0800 | [diff] [blame] | 52 | .init_name = "mb:16", |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 53 | .platform_data = &integrator_uart_data, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | }, |
| 55 | .res = { |
| 56 | .start = INTEGRATOR_UART0_BASE, |
| 57 | .end = INTEGRATOR_UART0_BASE + SZ_4K - 1, |
| 58 | .flags = IORESOURCE_MEM, |
| 59 | }, |
Russell King | 0dada61 | 2011-12-18 11:40:46 +0000 | [diff] [blame^] | 60 | .irq = { IRQ_UARTINT0 }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | }; |
| 62 | |
| 63 | static struct amba_device uart1_device = { |
| 64 | .dev = { |
Kay Sievers | 1d559e2 | 2009-01-06 10:44:43 -0800 | [diff] [blame] | 65 | .init_name = "mb:17", |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 66 | .platform_data = &integrator_uart_data, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | }, |
| 68 | .res = { |
| 69 | .start = INTEGRATOR_UART1_BASE, |
| 70 | .end = INTEGRATOR_UART1_BASE + SZ_4K - 1, |
| 71 | .flags = IORESOURCE_MEM, |
| 72 | }, |
Russell King | 0dada61 | 2011-12-18 11:40:46 +0000 | [diff] [blame^] | 73 | .irq = { IRQ_UARTINT1 }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | }; |
| 75 | |
| 76 | static struct amba_device kmi0_device = { |
| 77 | .dev = { |
Kay Sievers | 1d559e2 | 2009-01-06 10:44:43 -0800 | [diff] [blame] | 78 | .init_name = "mb:18", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | }, |
| 80 | .res = { |
| 81 | .start = KMI0_BASE, |
| 82 | .end = KMI0_BASE + SZ_4K - 1, |
| 83 | .flags = IORESOURCE_MEM, |
| 84 | }, |
Russell King | 0dada61 | 2011-12-18 11:40:46 +0000 | [diff] [blame^] | 85 | .irq = { IRQ_KMIINT0 }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | }; |
| 87 | |
| 88 | static struct amba_device kmi1_device = { |
| 89 | .dev = { |
Kay Sievers | 1d559e2 | 2009-01-06 10:44:43 -0800 | [diff] [blame] | 90 | .init_name = "mb:19", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | }, |
| 92 | .res = { |
| 93 | .start = KMI1_BASE, |
| 94 | .end = KMI1_BASE + SZ_4K - 1, |
| 95 | .flags = IORESOURCE_MEM, |
| 96 | }, |
Russell King | 0dada61 | 2011-12-18 11:40:46 +0000 | [diff] [blame^] | 97 | .irq = { IRQ_KMIINT1 }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | }; |
| 99 | |
| 100 | static struct amba_device *amba_devs[] __initdata = { |
| 101 | &rtc_device, |
| 102 | &uart0_device, |
| 103 | &uart1_device, |
| 104 | &kmi0_device, |
| 105 | &kmi1_device, |
| 106 | }; |
| 107 | |
Russell King | d72fbdf | 2008-11-08 20:08:08 +0000 | [diff] [blame] | 108 | /* |
| 109 | * These are fixed clocks. |
| 110 | */ |
| 111 | static struct clk clk24mhz = { |
| 112 | .rate = 24000000, |
| 113 | }; |
| 114 | |
| 115 | static struct clk uartclk = { |
| 116 | .rate = 14745600, |
| 117 | }; |
| 118 | |
Russell King | 3126c7b | 2010-07-15 11:01:17 +0100 | [diff] [blame] | 119 | static struct clk dummy_apb_pclk; |
| 120 | |
Rabin Vincent | a93ea9b | 2009-05-18 17:26:08 +0100 | [diff] [blame] | 121 | static struct clk_lookup lookups[] = { |
Russell King | 3126c7b | 2010-07-15 11:01:17 +0100 | [diff] [blame] | 122 | { /* Bus clock */ |
| 123 | .con_id = "apb_pclk", |
| 124 | .clk = &dummy_apb_pclk, |
Linus Walleij | bb76079 | 2011-09-08 21:23:15 +0100 | [diff] [blame] | 125 | }, { |
| 126 | /* Integrator/AP timer frequency */ |
| 127 | .dev_id = "ap_timer", |
| 128 | .clk = &clk24mhz, |
Russell King | 3126c7b | 2010-07-15 11:01:17 +0100 | [diff] [blame] | 129 | }, { /* UART0 */ |
Russell King | d72fbdf | 2008-11-08 20:08:08 +0000 | [diff] [blame] | 130 | .dev_id = "mb:16", |
| 131 | .clk = &uartclk, |
| 132 | }, { /* UART1 */ |
| 133 | .dev_id = "mb:17", |
| 134 | .clk = &uartclk, |
| 135 | }, { /* KMI0 */ |
| 136 | .dev_id = "mb:18", |
| 137 | .clk = &clk24mhz, |
| 138 | }, { /* KMI1 */ |
| 139 | .dev_id = "mb:19", |
| 140 | .clk = &clk24mhz, |
| 141 | }, { /* MMCI - IntegratorCP */ |
| 142 | .dev_id = "mb:1c", |
| 143 | .clk = &uartclk, |
| 144 | } |
| 145 | }; |
| 146 | |
Russell King | c735c98 | 2011-01-11 13:00:04 +0000 | [diff] [blame] | 147 | void __init integrator_init_early(void) |
| 148 | { |
| 149 | clkdev_add_table(lookups, ARRAY_SIZE(lookups)); |
| 150 | } |
| 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | static int __init integrator_init(void) |
| 153 | { |
| 154 | int i; |
| 155 | |
Linus Walleij | ee35887 | 2011-12-20 11:55:19 +0100 | [diff] [blame] | 156 | /* |
| 157 | * The Integrator/AP lacks necessary AMBA PrimeCell IDs, so we need to |
| 158 | * hard-code them. The Integator/CP and forward have proper cell IDs. |
| 159 | * Else we leave them undefined to the bus driver can autoprobe them. |
| 160 | */ |
| 161 | if (machine_is_integrator()) { |
| 162 | rtc_device.periphid = 0x00041030; |
| 163 | uart0_device.periphid = 0x00041010; |
| 164 | uart1_device.periphid = 0x00041010; |
| 165 | kmi0_device.periphid = 0x00041050; |
| 166 | kmi1_device.periphid = 0x00041050; |
| 167 | } |
| 168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | for (i = 0; i < ARRAY_SIZE(amba_devs); i++) { |
| 170 | struct amba_device *d = amba_devs[i]; |
| 171 | amba_device_register(d, &iomem_resource); |
| 172 | } |
| 173 | |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | arch_initcall(integrator_init); |
| 178 | |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 179 | /* |
| 180 | * On the Integrator platform, the port RTS and DTR are provided by |
| 181 | * bits in the following SC_CTRLS register bits: |
| 182 | * RTS DTR |
| 183 | * UART0 7 6 |
| 184 | * UART1 5 4 |
| 185 | */ |
Russell King | b830b9b | 2010-01-17 20:45:12 +0000 | [diff] [blame] | 186 | #define SC_CTRLC IO_ADDRESS(INTEGRATOR_SC_CTRLC) |
| 187 | #define SC_CTRLS IO_ADDRESS(INTEGRATOR_SC_CTRLS) |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 188 | |
| 189 | static void integrator_uart_set_mctrl(struct amba_device *dev, void __iomem *base, unsigned int mctrl) |
| 190 | { |
| 191 | unsigned int ctrls = 0, ctrlc = 0, rts_mask, dtr_mask; |
| 192 | |
| 193 | if (dev == &uart0_device) { |
| 194 | rts_mask = 1 << 4; |
| 195 | dtr_mask = 1 << 5; |
| 196 | } else { |
| 197 | rts_mask = 1 << 6; |
| 198 | dtr_mask = 1 << 7; |
| 199 | } |
| 200 | |
| 201 | if (mctrl & TIOCM_RTS) |
| 202 | ctrlc |= rts_mask; |
| 203 | else |
| 204 | ctrls |= rts_mask; |
| 205 | |
| 206 | if (mctrl & TIOCM_DTR) |
| 207 | ctrlc |= dtr_mask; |
| 208 | else |
| 209 | ctrls |= dtr_mask; |
| 210 | |
| 211 | __raw_writel(ctrls, SC_CTRLS); |
| 212 | __raw_writel(ctrlc, SC_CTRLC); |
| 213 | } |
| 214 | |
| 215 | static struct amba_pl010_data integrator_uart_data = { |
| 216 | .set_mctrl = integrator_uart_set_mctrl, |
| 217 | }; |
| 218 | |
Russell King | b830b9b | 2010-01-17 20:45:12 +0000 | [diff] [blame] | 219 | #define CM_CTRL IO_ADDRESS(INTEGRATOR_HDR_CTRL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 221 | static DEFINE_RAW_SPINLOCK(cm_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | /** |
| 224 | * cm_control - update the CM_CTRL register. |
| 225 | * @mask: bits to change |
| 226 | * @set: bits to set |
| 227 | */ |
| 228 | void cm_control(u32 mask, u32 set) |
| 229 | { |
| 230 | unsigned long flags; |
| 231 | u32 val; |
| 232 | |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 233 | raw_spin_lock_irqsave(&cm_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | val = readl(CM_CTRL) & ~mask; |
| 235 | writel(val | set, CM_CTRL); |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 236 | raw_spin_unlock_irqrestore(&cm_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | EXPORT_SYMBOL(cm_control); |
Russell King | 98c672c | 2010-05-22 18:18:57 +0100 | [diff] [blame] | 240 | |
| 241 | /* |
| 242 | * We need to stop things allocating the low memory; ideally we need a |
| 243 | * better implementation of GFP_DMA which does not assume that DMA-able |
| 244 | * memory starts at zero. |
| 245 | */ |
| 246 | void __init integrator_reserve(void) |
| 247 | { |
Russell King | 8d717a5 | 2010-05-22 19:47:18 +0100 | [diff] [blame] | 248 | memblock_reserve(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET); |
Russell King | 98c672c | 2010-05-22 18:18:57 +0100 | [diff] [blame] | 249 | } |
Russell King | 6338b66 | 2011-11-03 19:54:37 +0000 | [diff] [blame] | 250 | |
| 251 | /* |
| 252 | * To reset, we hit the on-board reset register in the system FPGA |
| 253 | */ |
| 254 | void integrator_restart(char mode, const char *cmd) |
| 255 | { |
| 256 | cm_control(CM_CTRL_RESET, CM_CTRL_RESET); |
| 257 | } |