Jason Wang | fa94f8d | 2010-06-24 21:11:28 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. |
| 3 | * Copyright (C) 2010 Jason Wang <jason77.wang@gmail.com> |
| 4 | * |
| 5 | * The code contained herein is licensed under the GNU General Public |
| 6 | * License. You may obtain a copy of the GNU General Public License |
| 7 | * Version 2 or later at the following locations: |
| 8 | * |
| 9 | * http://www.opensource.org/licenses/gpl-license.html |
| 10 | * http://www.gnu.org/copyleft/gpl.html |
| 11 | */ |
| 12 | |
| 13 | #include <linux/interrupt.h> |
| 14 | #include <linux/irq.h> |
| 15 | #include <linux/io.h> |
| 16 | #include <linux/platform_device.h> |
| 17 | #include <linux/gpio.h> |
| 18 | #include <linux/smsc911x.h> |
| 19 | |
| 20 | #include <mach/hardware.h> |
| 21 | |
| 22 | /* LAN9217 ethernet base address */ |
| 23 | #define LAN9217_BASE_ADDR(n) (n + 0x0) |
| 24 | /* External UART */ |
| 25 | #define UARTA_BASE_ADDR(n) (n + 0x8000) |
| 26 | #define UARTB_BASE_ADDR(n) (n + 0x10000) |
| 27 | |
| 28 | #define BOARD_IO_ADDR(n) (n + 0x20000) |
| 29 | /* LED switchs */ |
| 30 | #define LED_SWITCH_REG 0x00 |
| 31 | /* buttons */ |
| 32 | #define SWITCH_BUTTONS_REG 0x08 |
| 33 | /* status, interrupt */ |
| 34 | #define INTR_STATUS_REG 0x10 |
| 35 | #define INTR_MASK_REG 0x38 |
| 36 | #define INTR_RESET_REG 0x20 |
| 37 | /* magic word for debug CPLD */ |
| 38 | #define MAGIC_NUMBER1_REG 0x40 |
| 39 | #define MAGIC_NUMBER2_REG 0x48 |
| 40 | /* CPLD code version */ |
| 41 | #define CPLD_CODE_VER_REG 0x50 |
| 42 | /* magic word for debug CPLD */ |
| 43 | #define MAGIC_NUMBER3_REG 0x58 |
| 44 | /* module reset register*/ |
| 45 | #define MODULE_RESET_REG 0x60 |
| 46 | /* CPU ID and Personality ID */ |
| 47 | #define MCU_BOARD_ID_REG 0x68 |
| 48 | |
| 49 | #define MXC_IRQ_TO_EXPIO(irq) ((irq) - MXC_BOARD_IRQ_START) |
| 50 | #define MXC_IRQ_TO_GPIO(irq) ((irq) - MXC_INTERNAL_IRQS) |
| 51 | |
| 52 | #define MXC_EXP_IO_BASE (MXC_BOARD_IRQ_START) |
| 53 | #define MXC_MAX_EXP_IO_LINES 16 |
| 54 | |
| 55 | /* interrupts like external uart , external ethernet etc*/ |
| 56 | #define EXPIO_INT_ENET (MXC_BOARD_IRQ_START + 0) |
| 57 | #define EXPIO_INT_XUART_A (MXC_BOARD_IRQ_START + 1) |
| 58 | #define EXPIO_INT_XUART_B (MXC_BOARD_IRQ_START + 2) |
| 59 | #define EXPIO_INT_BUTTON_A (MXC_BOARD_IRQ_START + 3) |
| 60 | #define EXPIO_INT_BUTTON_B (MXC_BOARD_IRQ_START + 4) |
| 61 | |
| 62 | static void __iomem *brd_io; |
| 63 | static void expio_ack_irq(u32 irq); |
| 64 | |
| 65 | static struct resource smsc911x_resources[] = { |
| 66 | { |
| 67 | .flags = IORESOURCE_MEM, |
| 68 | } , { |
| 69 | .start = EXPIO_INT_ENET, |
| 70 | .end = EXPIO_INT_ENET, |
| 71 | .flags = IORESOURCE_IRQ, |
| 72 | }, |
| 73 | }; |
| 74 | |
| 75 | static struct smsc911x_platform_config smsc911x_config = { |
| 76 | .irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_LOW, |
| 77 | .flags = SMSC911X_USE_32BIT | SMSC911X_FORCE_INTERNAL_PHY, |
| 78 | }; |
| 79 | |
| 80 | static struct platform_device smsc_lan9217_device = { |
| 81 | .name = "smsc911x", |
| 82 | .id = 0, |
| 83 | .dev = { |
| 84 | .platform_data = &smsc911x_config, |
| 85 | }, |
| 86 | .num_resources = ARRAY_SIZE(smsc911x_resources), |
| 87 | .resource = smsc911x_resources, |
| 88 | }; |
| 89 | |
| 90 | static void mxc_expio_irq_handler(u32 irq, struct irq_desc *desc) |
| 91 | { |
| 92 | u32 imr_val; |
| 93 | u32 int_valid; |
| 94 | u32 expio_irq; |
| 95 | |
| 96 | desc->chip->mask(irq); /* irq = gpio irq number */ |
| 97 | |
| 98 | imr_val = __raw_readw(brd_io + INTR_MASK_REG); |
| 99 | int_valid = __raw_readw(brd_io + INTR_STATUS_REG) & ~imr_val; |
| 100 | |
| 101 | expio_irq = MXC_BOARD_IRQ_START; |
| 102 | for (; int_valid != 0; int_valid >>= 1, expio_irq++) { |
| 103 | struct irq_desc *d; |
| 104 | if ((int_valid & 1) == 0) |
| 105 | continue; |
| 106 | d = irq_desc + expio_irq; |
| 107 | if (unlikely(!(d->handle_irq))) |
| 108 | pr_err("\nEXPIO irq: %d unhandled\n", expio_irq); |
| 109 | else |
| 110 | d->handle_irq(expio_irq, d); |
| 111 | } |
| 112 | |
| 113 | desc->chip->ack(irq); |
| 114 | desc->chip->unmask(irq); |
| 115 | } |
| 116 | |
| 117 | /* |
| 118 | * Disable an expio pin's interrupt by setting the bit in the imr. |
| 119 | * Irq is an expio virtual irq number |
| 120 | */ |
| 121 | static void expio_mask_irq(u32 irq) |
| 122 | { |
| 123 | u16 reg; |
| 124 | u32 expio = MXC_IRQ_TO_EXPIO(irq); |
| 125 | |
| 126 | reg = __raw_readw(brd_io + INTR_MASK_REG); |
| 127 | reg |= (1 << expio); |
| 128 | __raw_writew(reg, brd_io + INTR_MASK_REG); |
| 129 | } |
| 130 | |
| 131 | static void expio_ack_irq(u32 irq) |
| 132 | { |
| 133 | u32 expio = MXC_IRQ_TO_EXPIO(irq); |
| 134 | |
| 135 | __raw_writew(1 << expio, brd_io + INTR_RESET_REG); |
| 136 | __raw_writew(0, brd_io + INTR_RESET_REG); |
| 137 | expio_mask_irq(irq); |
| 138 | } |
| 139 | |
| 140 | static void expio_unmask_irq(u32 irq) |
| 141 | { |
| 142 | u16 reg; |
| 143 | u32 expio = MXC_IRQ_TO_EXPIO(irq); |
| 144 | |
| 145 | reg = __raw_readw(brd_io + INTR_MASK_REG); |
| 146 | reg &= ~(1 << expio); |
| 147 | __raw_writew(reg, brd_io + INTR_MASK_REG); |
| 148 | } |
| 149 | |
| 150 | static struct irq_chip expio_irq_chip = { |
| 151 | .ack = expio_ack_irq, |
| 152 | .mask = expio_mask_irq, |
| 153 | .unmask = expio_unmask_irq, |
| 154 | }; |
| 155 | |
| 156 | int __init mxc_expio_init(u32 base, u32 p_irq) |
| 157 | { |
| 158 | int i; |
| 159 | |
| 160 | brd_io = ioremap(BOARD_IO_ADDR(base), SZ_4K); |
| 161 | if (brd_io == NULL) |
| 162 | return -ENOMEM; |
| 163 | |
| 164 | if ((__raw_readw(brd_io + MAGIC_NUMBER1_REG) != 0xAAAA) || |
| 165 | (__raw_readw(brd_io + MAGIC_NUMBER2_REG) != 0x5555) || |
| 166 | (__raw_readw(brd_io + MAGIC_NUMBER3_REG) != 0xCAFE)) { |
| 167 | pr_info("3-Stack Debug board not detected\n"); |
| 168 | iounmap(brd_io); |
| 169 | brd_io = NULL; |
| 170 | return -ENODEV; |
| 171 | } |
| 172 | |
| 173 | pr_info("3-Stack Debug board detected, rev = 0x%04X\n", |
| 174 | readw(brd_io + CPLD_CODE_VER_REG)); |
| 175 | |
| 176 | /* |
| 177 | * Configure INT line as GPIO input |
| 178 | */ |
| 179 | gpio_request(MXC_IRQ_TO_GPIO(p_irq), "expio_pirq"); |
| 180 | gpio_direction_input(MXC_IRQ_TO_GPIO(p_irq)); |
| 181 | |
| 182 | /* disable the interrupt and clear the status */ |
| 183 | __raw_writew(0, brd_io + INTR_MASK_REG); |
| 184 | __raw_writew(0xFFFF, brd_io + INTR_RESET_REG); |
| 185 | __raw_writew(0, brd_io + INTR_RESET_REG); |
| 186 | __raw_writew(0x1F, brd_io + INTR_MASK_REG); |
| 187 | for (i = MXC_EXP_IO_BASE; |
| 188 | i < (MXC_EXP_IO_BASE + MXC_MAX_EXP_IO_LINES); i++) { |
| 189 | set_irq_chip(i, &expio_irq_chip); |
| 190 | set_irq_handler(i, handle_level_irq); |
| 191 | set_irq_flags(i, IRQF_VALID); |
| 192 | } |
| 193 | set_irq_type(p_irq, IRQF_TRIGGER_LOW); |
| 194 | set_irq_chained_handler(p_irq, mxc_expio_irq_handler); |
| 195 | |
| 196 | /* Register Lan device on the debugboard */ |
| 197 | smsc911x_resources[0].start = LAN9217_BASE_ADDR(base); |
| 198 | smsc911x_resources[0].end = LAN9217_BASE_ADDR(base) + 0x100 - 1; |
| 199 | platform_device_register(&smsc_lan9217_device); |
| 200 | |
| 201 | return 0; |
| 202 | } |