Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 1 | /* |
Uwe Zeisberger | f30c226 | 2006-10-03 23:01:26 +0200 | [diff] [blame] | 2 | * linux/arch/arm/mach-omap1/serial.c |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 3 | * |
Marek Vašut | 65d873c | 2006-12-06 17:13:56 -0800 | [diff] [blame] | 4 | * OMAP1 serial support. |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 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 | |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 11 | #include <linux/module.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/init.h> |
Thomas Gleixner | d533c12 | 2006-07-01 22:32:35 +0100 | [diff] [blame] | 14 | #include <linux/irq.h> |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 15 | #include <linux/delay.h> |
| 16 | #include <linux/serial.h> |
| 17 | #include <linux/tty.h> |
| 18 | #include <linux/serial_8250.h> |
| 19 | #include <linux/serial_reg.h> |
Russell King | f8ce254 | 2006-01-07 16:15:52 +0000 | [diff] [blame] | 20 | #include <linux/clk.h> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 21 | #include <linux/io.h> |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 22 | |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 23 | #include <asm/mach-types.h> |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 24 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 25 | #include <mach/board.h> |
| 26 | #include <mach/mux.h> |
| 27 | #include <mach/gpio.h> |
| 28 | #include <mach/fpga.h> |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 29 | #ifdef CONFIG_PM |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 30 | #include <mach/pm.h> |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 31 | #endif |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 32 | |
Tony Lindgren | 120db2c | 2006-04-02 17:46:27 +0100 | [diff] [blame] | 33 | static struct clk * uart1_ck; |
| 34 | static struct clk * uart2_ck; |
| 35 | static struct clk * uart3_ck; |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 36 | |
| 37 | static inline unsigned int omap_serial_in(struct plat_serial8250_port *up, |
| 38 | int offset) |
| 39 | { |
| 40 | offset <<= up->regshift; |
| 41 | return (unsigned int)__raw_readb(up->membase + offset); |
| 42 | } |
| 43 | |
| 44 | static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset, |
| 45 | int value) |
| 46 | { |
| 47 | offset <<= p->regshift; |
| 48 | __raw_writeb(value, p->membase + offset); |
| 49 | } |
| 50 | |
| 51 | /* |
| 52 | * Internal UARTs need to be initialized for the 8250 autoconfig to work |
| 53 | * properly. Note that the TX watermark initialization may not be needed |
| 54 | * once the 8250.c watermark handling code is merged. |
| 55 | */ |
| 56 | static void __init omap_serial_reset(struct plat_serial8250_port *p) |
| 57 | { |
| 58 | omap_serial_outp(p, UART_OMAP_MDR1, 0x07); /* disable UART */ |
| 59 | omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */ |
| 60 | omap_serial_outp(p, UART_OMAP_MDR1, 0x00); /* enable UART */ |
| 61 | |
Marek Vašut | 65d873c | 2006-12-06 17:13:56 -0800 | [diff] [blame] | 62 | if (!cpu_is_omap15xx()) { |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 63 | omap_serial_outp(p, UART_OMAP_SYSC, 0x01); |
| 64 | while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01)); |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | static struct plat_serial8250_port serial_platform_data[] = { |
| 69 | { |
Russell King | e8a91c9 | 2008-09-01 22:07:37 +0100 | [diff] [blame] | 70 | .membase = IO_ADDRESS(OMAP_UART1_BASE), |
| 71 | .mapbase = OMAP_UART1_BASE, |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 72 | .irq = INT_UART1, |
| 73 | .flags = UPF_BOOT_AUTOCONF, |
| 74 | .iotype = UPIO_MEM, |
| 75 | .regshift = 2, |
| 76 | .uartclk = OMAP16XX_BASE_BAUD * 16, |
| 77 | }, |
| 78 | { |
Russell King | e8a91c9 | 2008-09-01 22:07:37 +0100 | [diff] [blame] | 79 | .membase = IO_ADDRESS(OMAP_UART2_BASE), |
| 80 | .mapbase = OMAP_UART2_BASE, |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 81 | .irq = INT_UART2, |
| 82 | .flags = UPF_BOOT_AUTOCONF, |
| 83 | .iotype = UPIO_MEM, |
| 84 | .regshift = 2, |
| 85 | .uartclk = OMAP16XX_BASE_BAUD * 16, |
| 86 | }, |
| 87 | { |
Russell King | e8a91c9 | 2008-09-01 22:07:37 +0100 | [diff] [blame] | 88 | .membase = IO_ADDRESS(OMAP_UART3_BASE), |
| 89 | .mapbase = OMAP_UART3_BASE, |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 90 | .irq = INT_UART3, |
| 91 | .flags = UPF_BOOT_AUTOCONF, |
| 92 | .iotype = UPIO_MEM, |
| 93 | .regshift = 2, |
| 94 | .uartclk = OMAP16XX_BASE_BAUD * 16, |
| 95 | }, |
| 96 | { }, |
| 97 | }; |
| 98 | |
| 99 | static struct platform_device serial_device = { |
| 100 | .name = "serial8250", |
Russell King | 6df29de | 2005-09-08 16:04:41 +0100 | [diff] [blame] | 101 | .id = PLAT8250_DEV_PLATFORM, |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 102 | .dev = { |
| 103 | .platform_data = serial_platform_data, |
| 104 | }, |
| 105 | }; |
| 106 | |
| 107 | /* |
| 108 | * Note that on Innovator-1510 UART2 pins conflict with USB2. |
| 109 | * By default UART2 does not work on Innovator-1510 if you have |
| 110 | * USB OHCI enabled. To use UART2, you must disable USB2 first. |
| 111 | */ |
Tony Lindgren | 3179a01 | 2005-11-10 14:26:48 +0000 | [diff] [blame] | 112 | void __init omap_serial_init(void) |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 113 | { |
| 114 | int i; |
Tony Lindgren | 3179a01 | 2005-11-10 14:26:48 +0000 | [diff] [blame] | 115 | const struct omap_uart_config *info; |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 116 | |
| 117 | if (cpu_is_omap730()) { |
| 118 | serial_platform_data[0].regshift = 0; |
| 119 | serial_platform_data[1].regshift = 0; |
| 120 | serial_platform_data[0].irq = INT_730_UART_MODEM_1; |
| 121 | serial_platform_data[1].irq = INT_730_UART_MODEM_IRDA_2; |
| 122 | } |
| 123 | |
Zebediah C. McClure | 56739a6 | 2009-03-23 18:07:40 -0700 | [diff] [blame] | 124 | if (cpu_is_omap850()) { |
| 125 | serial_platform_data[0].regshift = 0; |
| 126 | serial_platform_data[1].regshift = 0; |
| 127 | serial_platform_data[0].irq = INT_850_UART_MODEM_1; |
| 128 | serial_platform_data[1].irq = INT_850_UART_MODEM_IRDA_2; |
| 129 | } |
| 130 | |
Marek Vašut | 65d873c | 2006-12-06 17:13:56 -0800 | [diff] [blame] | 131 | if (cpu_is_omap15xx()) { |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 132 | serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16; |
| 133 | serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16; |
| 134 | serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16; |
| 135 | } |
| 136 | |
Tony Lindgren | 3179a01 | 2005-11-10 14:26:48 +0000 | [diff] [blame] | 137 | info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config); |
| 138 | if (info == NULL) |
| 139 | return; |
| 140 | |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 141 | for (i = 0; i < OMAP_MAX_NR_PORTS; i++) { |
| 142 | unsigned char reg; |
| 143 | |
Tony Lindgren | 3179a01 | 2005-11-10 14:26:48 +0000 | [diff] [blame] | 144 | if (!((1 << i) & info->enabled_uarts)) { |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 145 | serial_platform_data[i].membase = NULL; |
| 146 | serial_platform_data[i].mapbase = 0; |
| 147 | continue; |
| 148 | } |
| 149 | |
| 150 | switch (i) { |
| 151 | case 0: |
| 152 | uart1_ck = clk_get(NULL, "uart1_ck"); |
| 153 | if (IS_ERR(uart1_ck)) |
| 154 | printk("Could not get uart1_ck\n"); |
| 155 | else { |
Tony Lindgren | 30ff720 | 2006-01-17 15:33:51 -0800 | [diff] [blame] | 156 | clk_enable(uart1_ck); |
Marek Vašut | 65d873c | 2006-12-06 17:13:56 -0800 | [diff] [blame] | 157 | if (cpu_is_omap15xx()) |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 158 | clk_set_rate(uart1_ck, 12000000); |
| 159 | } |
Marek Vašut | 65d873c | 2006-12-06 17:13:56 -0800 | [diff] [blame] | 160 | if (cpu_is_omap15xx()) { |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 161 | omap_cfg_reg(UART1_TX); |
| 162 | omap_cfg_reg(UART1_RTS); |
| 163 | if (machine_is_omap_innovator()) { |
| 164 | reg = fpga_read(OMAP1510_FPGA_POWER); |
| 165 | reg |= OMAP1510_FPGA_PCR_COM1_EN; |
| 166 | fpga_write(reg, OMAP1510_FPGA_POWER); |
| 167 | udelay(10); |
| 168 | } |
| 169 | } |
| 170 | break; |
| 171 | case 1: |
| 172 | uart2_ck = clk_get(NULL, "uart2_ck"); |
| 173 | if (IS_ERR(uart2_ck)) |
| 174 | printk("Could not get uart2_ck\n"); |
| 175 | else { |
Tony Lindgren | 30ff720 | 2006-01-17 15:33:51 -0800 | [diff] [blame] | 176 | clk_enable(uart2_ck); |
Marek Vašut | 65d873c | 2006-12-06 17:13:56 -0800 | [diff] [blame] | 177 | if (cpu_is_omap15xx()) |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 178 | clk_set_rate(uart2_ck, 12000000); |
| 179 | else |
| 180 | clk_set_rate(uart2_ck, 48000000); |
| 181 | } |
Marek Vašut | 65d873c | 2006-12-06 17:13:56 -0800 | [diff] [blame] | 182 | if (cpu_is_omap15xx()) { |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 183 | omap_cfg_reg(UART2_TX); |
| 184 | omap_cfg_reg(UART2_RTS); |
| 185 | if (machine_is_omap_innovator()) { |
| 186 | reg = fpga_read(OMAP1510_FPGA_POWER); |
| 187 | reg |= OMAP1510_FPGA_PCR_COM2_EN; |
| 188 | fpga_write(reg, OMAP1510_FPGA_POWER); |
| 189 | udelay(10); |
| 190 | } |
| 191 | } |
| 192 | break; |
| 193 | case 2: |
| 194 | uart3_ck = clk_get(NULL, "uart3_ck"); |
| 195 | if (IS_ERR(uart3_ck)) |
| 196 | printk("Could not get uart3_ck\n"); |
| 197 | else { |
Tony Lindgren | 30ff720 | 2006-01-17 15:33:51 -0800 | [diff] [blame] | 198 | clk_enable(uart3_ck); |
Marek Vašut | 65d873c | 2006-12-06 17:13:56 -0800 | [diff] [blame] | 199 | if (cpu_is_omap15xx()) |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 200 | clk_set_rate(uart3_ck, 12000000); |
| 201 | } |
Marek Vašut | 65d873c | 2006-12-06 17:13:56 -0800 | [diff] [blame] | 202 | if (cpu_is_omap15xx()) { |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 203 | omap_cfg_reg(UART3_TX); |
| 204 | omap_cfg_reg(UART3_RX); |
| 205 | } |
| 206 | break; |
| 207 | } |
| 208 | omap_serial_reset(&serial_platform_data[i]); |
| 209 | } |
| 210 | } |
| 211 | |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 212 | #ifdef CONFIG_OMAP_SERIAL_WAKE |
| 213 | |
Linus Torvalds | 0cd61b6 | 2006-10-06 10:53:39 -0700 | [diff] [blame] | 214 | static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id) |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 215 | { |
| 216 | /* Need to do something with serial port right after wake-up? */ |
| 217 | return IRQ_HANDLED; |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * Reroutes serial RX lines to GPIO lines for the duration of |
| 222 | * sleep to allow waking up the device from serial port even |
| 223 | * in deep sleep. |
| 224 | */ |
| 225 | void omap_serial_wake_trigger(int enable) |
| 226 | { |
| 227 | if (!cpu_is_omap16xx()) |
| 228 | return; |
| 229 | |
| 230 | if (uart1_ck != NULL) { |
| 231 | if (enable) |
| 232 | omap_cfg_reg(V14_16XX_GPIO37); |
| 233 | else |
| 234 | omap_cfg_reg(V14_16XX_UART1_RX); |
| 235 | } |
| 236 | if (uart2_ck != NULL) { |
| 237 | if (enable) |
| 238 | omap_cfg_reg(R9_16XX_GPIO18); |
| 239 | else |
| 240 | omap_cfg_reg(R9_16XX_UART2_RX); |
| 241 | } |
| 242 | if (uart3_ck != NULL) { |
| 243 | if (enable) |
| 244 | omap_cfg_reg(L14_16XX_GPIO49); |
| 245 | else |
| 246 | omap_cfg_reg(L14_16XX_UART3_RX); |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | static void __init omap_serial_set_port_wakeup(int gpio_nr) |
| 251 | { |
| 252 | int ret; |
| 253 | |
Jarkko Nikula | f2d18fe | 2008-12-10 17:35:30 -0800 | [diff] [blame] | 254 | ret = gpio_request(gpio_nr, "UART wake"); |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 255 | if (ret < 0) { |
| 256 | printk(KERN_ERR "Could not request UART wake GPIO: %i\n", |
| 257 | gpio_nr); |
| 258 | return; |
| 259 | } |
David Brownell | 40e3925 | 2008-12-10 17:35:26 -0800 | [diff] [blame] | 260 | gpio_direction_input(gpio_nr); |
David Brownell | 15f74b0 | 2008-12-10 17:35:26 -0800 | [diff] [blame] | 261 | ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt, |
Thomas Gleixner | 52e405e | 2006-07-03 02:20:05 +0200 | [diff] [blame] | 262 | IRQF_TRIGGER_RISING, "serial wakeup", NULL); |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 263 | if (ret) { |
Jarkko Nikula | f2d18fe | 2008-12-10 17:35:30 -0800 | [diff] [blame] | 264 | gpio_free(gpio_nr); |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 265 | printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n", |
| 266 | gpio_nr); |
| 267 | return; |
| 268 | } |
David Brownell | 15f74b0 | 2008-12-10 17:35:26 -0800 | [diff] [blame] | 269 | enable_irq_wake(gpio_to_irq(gpio_nr)); |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | static int __init omap_serial_wakeup_init(void) |
| 273 | { |
| 274 | if (!cpu_is_omap16xx()) |
| 275 | return 0; |
| 276 | |
| 277 | if (uart1_ck != NULL) |
| 278 | omap_serial_set_port_wakeup(37); |
| 279 | if (uart2_ck != NULL) |
| 280 | omap_serial_set_port_wakeup(18); |
| 281 | if (uart3_ck != NULL) |
| 282 | omap_serial_set_port_wakeup(49); |
| 283 | |
| 284 | return 0; |
| 285 | } |
| 286 | late_initcall(omap_serial_wakeup_init); |
| 287 | |
| 288 | #endif /* CONFIG_OMAP_SERIAL_WAKE */ |
| 289 | |
Tony Lindgren | f577ffd | 2005-07-10 19:58:12 +0100 | [diff] [blame] | 290 | static int __init omap_init(void) |
| 291 | { |
| 292 | return platform_device_register(&serial_device); |
| 293 | } |
| 294 | arch_initcall(omap_init); |