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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *  linux/arch/arm/mach-pxa/viper.c
0004  *
0005  *  Support for the Arcom VIPER SBC.
0006  *
0007  *  Author: Ian Campbell
0008  *  Created:    Feb 03, 2003
0009  *  Copyright:  Arcom Control Systems
0010  *
0011  *  Maintained by Marc Zyngier <maz@misterjones.org>
0012  *                             <marc.zyngier@altran.com>
0013  *
0014  * Based on lubbock.c:
0015  *  Author: Nicolas Pitre
0016  *  Created:    Jun 15, 2001
0017  *  Copyright:  MontaVista Software Inc.
0018  */
0019 
0020 #include <linux/types.h>
0021 #include <linux/memory.h>
0022 #include <linux/cpu.h>
0023 #include <linux/cpufreq.h>
0024 #include <linux/delay.h>
0025 #include <linux/fs.h>
0026 #include <linux/init.h>
0027 #include <linux/slab.h>
0028 #include <linux/interrupt.h>
0029 #include <linux/major.h>
0030 #include <linux/module.h>
0031 #include <linux/pm.h>
0032 #include <linux/sched.h>
0033 #include <linux/gpio.h>
0034 #include <linux/jiffies.h>
0035 #include <linux/platform_data/i2c-gpio.h>
0036 #include <linux/gpio/machine.h>
0037 #include <linux/platform_data/i2c-pxa.h>
0038 #include <linux/serial_8250.h>
0039 #include <linux/smc91x.h>
0040 #include <linux/pwm.h>
0041 #include <linux/pwm_backlight.h>
0042 #include <linux/usb/isp116x.h>
0043 #include <linux/mtd/mtd.h>
0044 #include <linux/mtd/partitions.h>
0045 #include <linux/mtd/physmap.h>
0046 #include <linux/syscore_ops.h>
0047 
0048 #include "pxa25x.h"
0049 #include <linux/platform_data/asoc-pxa.h>
0050 #include <linux/platform_data/video-pxafb.h>
0051 #include "regs-uart.h"
0052 #include "viper-pcmcia.h"
0053 #include "viper.h"
0054 
0055 #include <asm/setup.h>
0056 #include <asm/mach-types.h>
0057 #include <asm/irq.h>
0058 #include <linux/sizes.h>
0059 #include <asm/system_info.h>
0060 
0061 #include <asm/mach/arch.h>
0062 #include <asm/mach/map.h>
0063 #include <asm/mach/irq.h>
0064 
0065 #include "generic.h"
0066 #include "devices.h"
0067 
0068 static unsigned int icr;
0069 
0070 static void viper_icr_set_bit(unsigned int bit)
0071 {
0072     icr |= bit;
0073     VIPER_ICR = icr;
0074 }
0075 
0076 static void viper_icr_clear_bit(unsigned int bit)
0077 {
0078     icr &= ~bit;
0079     VIPER_ICR = icr;
0080 }
0081 
0082 /* This function is used from the pcmcia module to reset the CF */
0083 static void viper_cf_reset(int state)
0084 {
0085     if (state)
0086         viper_icr_set_bit(VIPER_ICR_CF_RST);
0087     else
0088         viper_icr_clear_bit(VIPER_ICR_CF_RST);
0089 }
0090 
0091 static struct arcom_pcmcia_pdata viper_pcmcia_info = {
0092     .cd_gpio    = VIPER_CF_CD_GPIO,
0093     .rdy_gpio   = VIPER_CF_RDY_GPIO,
0094     .pwr_gpio   = VIPER_CF_POWER_GPIO,
0095     .reset      = viper_cf_reset,
0096 };
0097 
0098 static struct platform_device viper_pcmcia_device = {
0099     .name       = "viper-pcmcia",
0100     .id     = -1,
0101     .dev        = {
0102         .platform_data  = &viper_pcmcia_info,
0103     },
0104 };
0105 
0106 /*
0107  * The CPLD version register was not present on VIPER boards prior to
0108  * v2i1. On v1 boards where the version register is not present we
0109  * will just read back the previous value from the databus.
0110  *
0111  * Therefore we do two reads. The first time we write 0 to the
0112  * (read-only) register before reading and the second time we write
0113  * 0xff first. If the two reads do not match or they read back as 0xff
0114  * or 0x00 then we have version 1 hardware.
0115  */
0116 static u8 viper_hw_version(void)
0117 {
0118     u8 v1, v2;
0119     unsigned long flags;
0120 
0121     local_irq_save(flags);
0122 
0123     VIPER_VERSION = 0;
0124     v1 = VIPER_VERSION;
0125     VIPER_VERSION = 0xff;
0126     v2 = VIPER_VERSION;
0127 
0128     v1 = (v1 != v2 || v1 == 0xff) ? 0 : v1;
0129 
0130     local_irq_restore(flags);
0131     return v1;
0132 }
0133 
0134 /* CPU system core operations. */
0135 static int viper_cpu_suspend(void)
0136 {
0137     viper_icr_set_bit(VIPER_ICR_R_DIS);
0138     return 0;
0139 }
0140 
0141 static void viper_cpu_resume(void)
0142 {
0143     viper_icr_clear_bit(VIPER_ICR_R_DIS);
0144 }
0145 
0146 static struct syscore_ops viper_cpu_syscore_ops = {
0147     .suspend    = viper_cpu_suspend,
0148     .resume     = viper_cpu_resume,
0149 };
0150 
0151 static unsigned int current_voltage_divisor;
0152 
0153 /*
0154  * If force is not true then step from existing to new divisor. If
0155  * force is true then jump straight to the new divisor. Stepping is
0156  * used because if the jump in voltage is too large, the VCC can dip
0157  * too low and the regulator cuts out.
0158  *
0159  * force can be used to initialize the divisor to a know state by
0160  * setting the value for the current clock speed, since we are already
0161  * running at that speed we know the voltage should be pretty close so
0162  * the jump won't be too large
0163  */
0164 static void viper_set_core_cpu_voltage(unsigned long khz, int force)
0165 {
0166     int i = 0;
0167     unsigned int divisor = 0;
0168     const char *v;
0169 
0170     if (khz < 200000) {
0171         v = "1.0"; divisor = 0xfff;
0172     } else if (khz < 300000) {
0173         v = "1.1"; divisor = 0xde5;
0174     } else {
0175         v = "1.3"; divisor = 0x325;
0176     }
0177 
0178     pr_debug("viper: setting CPU core voltage to %sV at %d.%03dMHz\n",
0179          v, (int)khz / 1000, (int)khz % 1000);
0180 
0181 #define STEP 0x100
0182     do {
0183         int step;
0184 
0185         if (force)
0186             step = divisor;
0187         else if (current_voltage_divisor < divisor - STEP)
0188             step = current_voltage_divisor + STEP;
0189         else if (current_voltage_divisor > divisor + STEP)
0190             step = current_voltage_divisor - STEP;
0191         else
0192             step = divisor;
0193         force = 0;
0194 
0195         gpio_set_value(VIPER_PSU_CLK_GPIO, 0);
0196         gpio_set_value(VIPER_PSU_nCS_LD_GPIO, 0);
0197 
0198         for (i = 1 << 11 ; i > 0 ; i >>= 1) {
0199             udelay(1);
0200 
0201             gpio_set_value(VIPER_PSU_DATA_GPIO, step & i);
0202             udelay(1);
0203 
0204             gpio_set_value(VIPER_PSU_CLK_GPIO, 1);
0205             udelay(1);
0206 
0207             gpio_set_value(VIPER_PSU_CLK_GPIO, 0);
0208         }
0209         udelay(1);
0210 
0211         gpio_set_value(VIPER_PSU_nCS_LD_GPIO, 1);
0212         udelay(1);
0213 
0214         gpio_set_value(VIPER_PSU_nCS_LD_GPIO, 0);
0215 
0216         current_voltage_divisor = step;
0217     } while (current_voltage_divisor != divisor);
0218 }
0219 
0220 /* Interrupt handling */
0221 static unsigned long viper_irq_enabled_mask;
0222 static const int viper_isa_irqs[] = { 3, 4, 5, 6, 7, 10, 11, 12, 9, 14, 15 };
0223 static const int viper_isa_irq_map[] = {
0224     0,      /* ISA irq #0, invalid */
0225     0,      /* ISA irq #1, invalid */
0226     0,      /* ISA irq #2, invalid */
0227     1 << 0,     /* ISA irq #3 */
0228     1 << 1,     /* ISA irq #4 */
0229     1 << 2,     /* ISA irq #5 */
0230     1 << 3,     /* ISA irq #6 */
0231     1 << 4,     /* ISA irq #7 */
0232     0,      /* ISA irq #8, invalid */
0233     1 << 8,     /* ISA irq #9 */
0234     1 << 5,     /* ISA irq #10 */
0235     1 << 6,     /* ISA irq #11 */
0236     1 << 7,     /* ISA irq #12 */
0237     0,      /* ISA irq #13, invalid */
0238     1 << 9,     /* ISA irq #14 */
0239     1 << 10,    /* ISA irq #15 */
0240 };
0241 
0242 static inline int viper_irq_to_bitmask(unsigned int irq)
0243 {
0244     return viper_isa_irq_map[irq - PXA_ISA_IRQ(0)];
0245 }
0246 
0247 static inline int viper_bit_to_irq(int bit)
0248 {
0249     return viper_isa_irqs[bit] + PXA_ISA_IRQ(0);
0250 }
0251 
0252 static void viper_ack_irq(struct irq_data *d)
0253 {
0254     int viper_irq = viper_irq_to_bitmask(d->irq);
0255 
0256     if (viper_irq & 0xff)
0257         VIPER_LO_IRQ_STATUS = viper_irq;
0258     else
0259         VIPER_HI_IRQ_STATUS = (viper_irq >> 8);
0260 }
0261 
0262 static void viper_mask_irq(struct irq_data *d)
0263 {
0264     viper_irq_enabled_mask &= ~(viper_irq_to_bitmask(d->irq));
0265 }
0266 
0267 static void viper_unmask_irq(struct irq_data *d)
0268 {
0269     viper_irq_enabled_mask |= viper_irq_to_bitmask(d->irq);
0270 }
0271 
0272 static inline unsigned long viper_irq_pending(void)
0273 {
0274     return (VIPER_HI_IRQ_STATUS << 8 | VIPER_LO_IRQ_STATUS) &
0275             viper_irq_enabled_mask;
0276 }
0277 
0278 static void viper_irq_handler(struct irq_desc *desc)
0279 {
0280     unsigned int irq;
0281     unsigned long pending;
0282 
0283     pending = viper_irq_pending();
0284     do {
0285         /* we're in a chained irq handler,
0286          * so ack the interrupt by hand */
0287         desc->irq_data.chip->irq_ack(&desc->irq_data);
0288 
0289         if (likely(pending)) {
0290             irq = viper_bit_to_irq(__ffs(pending));
0291             generic_handle_irq(irq);
0292         }
0293         pending = viper_irq_pending();
0294     } while (pending);
0295 }
0296 
0297 static struct irq_chip viper_irq_chip = {
0298     .name       = "ISA",
0299     .irq_ack    = viper_ack_irq,
0300     .irq_mask   = viper_mask_irq,
0301     .irq_unmask = viper_unmask_irq
0302 };
0303 
0304 static void __init viper_init_irq(void)
0305 {
0306     int level;
0307     int isa_irq;
0308 
0309     pxa25x_init_irq();
0310 
0311     /* setup ISA IRQs */
0312     for (level = 0; level < ARRAY_SIZE(viper_isa_irqs); level++) {
0313         isa_irq = viper_bit_to_irq(level);
0314         irq_set_chip_and_handler(isa_irq, &viper_irq_chip,
0315                      handle_edge_irq);
0316         irq_clear_status_flags(isa_irq, IRQ_NOREQUEST | IRQ_NOPROBE);
0317     }
0318 
0319     irq_set_chained_handler(gpio_to_irq(VIPER_CPLD_GPIO),
0320                 viper_irq_handler);
0321     irq_set_irq_type(gpio_to_irq(VIPER_CPLD_GPIO), IRQ_TYPE_EDGE_BOTH);
0322 }
0323 
0324 /* Flat Panel */
0325 static struct pxafb_mode_info fb_mode_info[] = {
0326     {
0327         .pixclock   = 157500,
0328 
0329         .xres       = 320,
0330         .yres       = 240,
0331 
0332         .bpp        = 16,
0333 
0334         .hsync_len  = 63,
0335         .left_margin    = 7,
0336         .right_margin   = 13,
0337 
0338         .vsync_len  = 20,
0339         .upper_margin   = 0,
0340         .lower_margin   = 0,
0341 
0342         .sync       = 0,
0343     },
0344 };
0345 
0346 static struct pxafb_mach_info fb_info = {
0347     .modes          = fb_mode_info,
0348     .num_modes      = 1,
0349     .lcd_conn       = LCD_COLOR_TFT_16BPP | LCD_PCLK_EDGE_FALL,
0350 };
0351 
0352 static struct pwm_lookup viper_pwm_lookup[] = {
0353     PWM_LOOKUP("pxa25x-pwm.0", 0, "pwm-backlight.0", NULL, 1000000,
0354            PWM_POLARITY_NORMAL),
0355 };
0356 
0357 static int viper_backlight_init(struct device *dev)
0358 {
0359     int ret;
0360 
0361     /* GPIO9 and 10 control FB backlight. Initialise to off */
0362     ret = gpio_request(VIPER_BCKLIGHT_EN_GPIO, "Backlight");
0363     if (ret)
0364         goto err_request_bckl;
0365 
0366     ret = gpio_request(VIPER_LCD_EN_GPIO, "LCD");
0367     if (ret)
0368         goto err_request_lcd;
0369 
0370     ret = gpio_direction_output(VIPER_BCKLIGHT_EN_GPIO, 0);
0371     if (ret)
0372         goto err_dir;
0373 
0374     ret = gpio_direction_output(VIPER_LCD_EN_GPIO, 0);
0375     if (ret)
0376         goto err_dir;
0377 
0378     return 0;
0379 
0380 err_dir:
0381     gpio_free(VIPER_LCD_EN_GPIO);
0382 err_request_lcd:
0383     gpio_free(VIPER_BCKLIGHT_EN_GPIO);
0384 err_request_bckl:
0385     dev_err(dev, "Failed to setup LCD GPIOs\n");
0386 
0387     return ret;
0388 }
0389 
0390 static int viper_backlight_notify(struct device *dev, int brightness)
0391 {
0392     gpio_set_value(VIPER_LCD_EN_GPIO, !!brightness);
0393     gpio_set_value(VIPER_BCKLIGHT_EN_GPIO, !!brightness);
0394 
0395     return brightness;
0396 }
0397 
0398 static void viper_backlight_exit(struct device *dev)
0399 {
0400     gpio_free(VIPER_LCD_EN_GPIO);
0401     gpio_free(VIPER_BCKLIGHT_EN_GPIO);
0402 }
0403 
0404 static struct platform_pwm_backlight_data viper_backlight_data = {
0405     .max_brightness = 100,
0406     .dft_brightness = 100,
0407     .init       = viper_backlight_init,
0408     .notify     = viper_backlight_notify,
0409     .exit       = viper_backlight_exit,
0410 };
0411 
0412 static struct platform_device viper_backlight_device = {
0413     .name       = "pwm-backlight",
0414     .dev        = {
0415         .parent     = &pxa25x_device_pwm0.dev,
0416         .platform_data  = &viper_backlight_data,
0417     },
0418 };
0419 
0420 /* Ethernet */
0421 static struct resource smc91x_resources[] = {
0422     [0] = {
0423         .name   = "smc91x-regs",
0424         .start  = VIPER_ETH_PHYS + 0x300,
0425         .end    = VIPER_ETH_PHYS + 0x30f,
0426         .flags  = IORESOURCE_MEM,
0427     },
0428     [1] = {
0429         .start  = PXA_GPIO_TO_IRQ(VIPER_ETH_GPIO),
0430         .end    = PXA_GPIO_TO_IRQ(VIPER_ETH_GPIO),
0431         .flags  = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
0432     },
0433     [2] = {
0434         .name   = "smc91x-data32",
0435         .start  = VIPER_ETH_DATA_PHYS,
0436         .end    = VIPER_ETH_DATA_PHYS + 3,
0437         .flags  = IORESOURCE_MEM,
0438     },
0439 };
0440 
0441 static struct smc91x_platdata viper_smc91x_info = {
0442     .flags  = SMC91X_USE_16BIT | SMC91X_NOWAIT,
0443     .leda   = RPC_LED_100_10,
0444     .ledb   = RPC_LED_TX_RX,
0445 };
0446 
0447 static struct platform_device smc91x_device = {
0448     .name       = "smc91x",
0449     .id     = -1,
0450     .num_resources  = ARRAY_SIZE(smc91x_resources),
0451     .resource       = smc91x_resources,
0452     .dev        = {
0453         .platform_data  = &viper_smc91x_info,
0454     },
0455 };
0456 
0457 /* i2c */
0458 static struct gpiod_lookup_table viper_i2c_gpiod_table = {
0459     .dev_id     = "i2c-gpio.1",
0460     .table      = {
0461         GPIO_LOOKUP_IDX("gpio-pxa", VIPER_RTC_I2C_SDA_GPIO,
0462                 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
0463         GPIO_LOOKUP_IDX("gpio-pxa", VIPER_RTC_I2C_SCL_GPIO,
0464                 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
0465     },
0466 };
0467 
0468 static struct i2c_gpio_platform_data i2c_bus_data = {
0469     .udelay  = 10,
0470     .timeout = HZ,
0471 };
0472 
0473 static struct platform_device i2c_bus_device = {
0474     .name       = "i2c-gpio",
0475     .id     = 1, /* pxa2xx-i2c is bus 0, so start at 1 */
0476     .dev = {
0477         .platform_data = &i2c_bus_data,
0478     }
0479 };
0480 
0481 static struct i2c_board_info __initdata viper_i2c_devices[] = {
0482     {
0483         I2C_BOARD_INFO("ds1338", 0x68),
0484     },
0485 };
0486 
0487 /*
0488  * Serial configuration:
0489  * You can either have the standard PXA ports driven by the PXA driver,
0490  * or all the ports (PXA + 16850) driven by the 8250 driver.
0491  * Choose your poison.
0492  */
0493 
0494 static struct resource viper_serial_resources[] = {
0495 #ifndef CONFIG_SERIAL_PXA
0496     {
0497         .start  = 0x40100000,
0498         .end    = 0x4010001f,
0499         .flags  = IORESOURCE_MEM,
0500     },
0501     {
0502         .start  = 0x40200000,
0503         .end    = 0x4020001f,
0504         .flags  = IORESOURCE_MEM,
0505     },
0506     {
0507         .start  = 0x40700000,
0508         .end    = 0x4070001f,
0509         .flags  = IORESOURCE_MEM,
0510     },
0511     {
0512         .start  = VIPER_UARTA_PHYS,
0513         .end    = VIPER_UARTA_PHYS + 0xf,
0514         .flags  = IORESOURCE_MEM,
0515     },
0516     {
0517         .start  = VIPER_UARTB_PHYS,
0518         .end    = VIPER_UARTB_PHYS + 0xf,
0519         .flags  = IORESOURCE_MEM,
0520     },
0521 #else
0522     {
0523         0,
0524     },
0525 #endif
0526 };
0527 
0528 static struct plat_serial8250_port serial_platform_data[] = {
0529 #ifndef CONFIG_SERIAL_PXA
0530     /* Internal UARTs */
0531     {
0532         .membase    = (void *)&FFUART,
0533         .mapbase    = __PREG(FFUART),
0534         .irq        = IRQ_FFUART,
0535         .uartclk    = 921600 * 16,
0536         .regshift   = 2,
0537         .flags      = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
0538         .iotype     = UPIO_MEM,
0539     },
0540     {
0541         .membase    = (void *)&BTUART,
0542         .mapbase    = __PREG(BTUART),
0543         .irq        = IRQ_BTUART,
0544         .uartclk    = 921600 * 16,
0545         .regshift   = 2,
0546         .flags      = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
0547         .iotype     = UPIO_MEM,
0548     },
0549     {
0550         .membase    = (void *)&STUART,
0551         .mapbase    = __PREG(STUART),
0552         .irq        = IRQ_STUART,
0553         .uartclk    = 921600 * 16,
0554         .regshift   = 2,
0555         .flags      = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
0556         .iotype     = UPIO_MEM,
0557     },
0558     /* External UARTs */
0559     {
0560         .mapbase    = VIPER_UARTA_PHYS,
0561         .irq        = PXA_GPIO_TO_IRQ(VIPER_UARTA_GPIO),
0562         .irqflags   = IRQF_TRIGGER_RISING,
0563         .uartclk    = 1843200,
0564         .regshift   = 1,
0565         .iotype     = UPIO_MEM,
0566         .flags      = UPF_BOOT_AUTOCONF | UPF_IOREMAP |
0567                   UPF_SKIP_TEST,
0568     },
0569     {
0570         .mapbase    = VIPER_UARTB_PHYS,
0571         .irq        = PXA_GPIO_TO_IRQ(VIPER_UARTB_GPIO),
0572         .irqflags   = IRQF_TRIGGER_RISING,
0573         .uartclk    = 1843200,
0574         .regshift   = 1,
0575         .iotype     = UPIO_MEM,
0576         .flags      = UPF_BOOT_AUTOCONF | UPF_IOREMAP |
0577                   UPF_SKIP_TEST,
0578     },
0579 #endif
0580     { },
0581 };
0582 
0583 static struct platform_device serial_device = {
0584     .name           = "serial8250",
0585     .id         = 0,
0586     .dev            = {
0587         .platform_data  = serial_platform_data,
0588     },
0589     .num_resources      = ARRAY_SIZE(viper_serial_resources),
0590     .resource       = viper_serial_resources,
0591 };
0592 
0593 /* USB */
0594 static void isp116x_delay(struct device *dev, int delay)
0595 {
0596     ndelay(delay);
0597 }
0598 
0599 static struct resource isp116x_resources[] = {
0600     [0] = { /* DATA */
0601         .start  = VIPER_USB_PHYS + 0,
0602         .end    = VIPER_USB_PHYS + 1,
0603         .flags  = IORESOURCE_MEM,
0604     },
0605     [1] = { /* ADDR */
0606         .start  = VIPER_USB_PHYS + 2,
0607         .end    = VIPER_USB_PHYS + 3,
0608         .flags  = IORESOURCE_MEM,
0609     },
0610     [2] = {
0611         .start  = PXA_GPIO_TO_IRQ(VIPER_USB_GPIO),
0612         .end    = PXA_GPIO_TO_IRQ(VIPER_USB_GPIO),
0613         .flags  = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
0614     },
0615 };
0616 
0617 /* (DataBusWidth16|AnalogOCEnable|DREQOutputPolarity|DownstreamPort15KRSel ) */
0618 static struct isp116x_platform_data isp116x_platform_data = {
0619     /* Enable internal resistors on downstream ports */
0620     .sel15Kres      = 1,
0621     /* On-chip overcurrent protection */
0622     .oc_enable      = 1,
0623     /* INT output polarity */
0624     .int_act_high       = 1,
0625     /* INT edge or level triggered */
0626     .int_edge_triggered = 0,
0627 
0628     /* WAKEUP pin connected - NOT SUPPORTED  */
0629     /* .remote_wakeup_connected = 0, */
0630     /* Wakeup by devices on usb bus enabled */
0631     .remote_wakeup_enable   = 0,
0632     .delay          = isp116x_delay,
0633 };
0634 
0635 static struct platform_device isp116x_device = {
0636     .name           = "isp116x-hcd",
0637     .id         = -1,
0638     .num_resources      = ARRAY_SIZE(isp116x_resources),
0639     .resource           = isp116x_resources,
0640     .dev            = {
0641         .platform_data  = &isp116x_platform_data,
0642     },
0643 
0644 };
0645 
0646 /* MTD */
0647 static struct resource mtd_resources[] = {
0648     [0] = { /* RedBoot config + filesystem flash */
0649         .start  = VIPER_FLASH_PHYS,
0650         .end    = VIPER_FLASH_PHYS + SZ_32M - 1,
0651         .flags  = IORESOURCE_MEM,
0652     },
0653     [1] = { /* Boot flash */
0654         .start  = VIPER_BOOT_PHYS,
0655         .end    = VIPER_BOOT_PHYS + SZ_1M - 1,
0656         .flags  = IORESOURCE_MEM,
0657     },
0658     [2] = { /*
0659          * SRAM size is actually 256KB, 8bits, with a sparse mapping
0660          * (each byte is on a 16bit boundary).
0661          */
0662         .start  = _VIPER_SRAM_BASE,
0663         .end    = _VIPER_SRAM_BASE + SZ_512K - 1,
0664         .flags  = IORESOURCE_MEM,
0665     },
0666 };
0667 
0668 static struct mtd_partition viper_boot_flash_partition = {
0669     .name       = "RedBoot",
0670     .size       = SZ_1M,
0671     .offset     = 0,
0672     .mask_flags = MTD_WRITEABLE,    /* force R/O */
0673 };
0674 
0675 static struct physmap_flash_data viper_flash_data[] = {
0676     [0] = {
0677         .width      = 2,
0678         .parts      = NULL,
0679         .nr_parts   = 0,
0680     },
0681     [1] = {
0682         .width      = 2,
0683         .parts      = &viper_boot_flash_partition,
0684         .nr_parts   = 1,
0685     },
0686 };
0687 
0688 static struct platform_device viper_mtd_devices[] = {
0689     [0] = {
0690         .name       = "physmap-flash",
0691         .id     = 0,
0692         .dev        = {
0693             .platform_data  = &viper_flash_data[0],
0694         },
0695         .resource   = &mtd_resources[0],
0696         .num_resources  = 1,
0697     },
0698     [1] = {
0699         .name       = "physmap-flash",
0700         .id     = 1,
0701         .dev        = {
0702             .platform_data  = &viper_flash_data[1],
0703         },
0704         .resource   = &mtd_resources[1],
0705         .num_resources  = 1,
0706     },
0707 };
0708 
0709 static struct platform_device *viper_devs[] __initdata = {
0710     &smc91x_device,
0711     &i2c_bus_device,
0712     &serial_device,
0713     &isp116x_device,
0714     &viper_mtd_devices[0],
0715     &viper_mtd_devices[1],
0716     &viper_backlight_device,
0717     &viper_pcmcia_device,
0718 };
0719 
0720 static mfp_cfg_t viper_pin_config[] __initdata = {
0721     /* Chip selects */
0722     GPIO15_nCS_1,
0723     GPIO78_nCS_2,
0724     GPIO79_nCS_3,
0725     GPIO80_nCS_4,
0726     GPIO33_nCS_5,
0727 
0728     /* AC97 */
0729     GPIO28_AC97_BITCLK,
0730     GPIO29_AC97_SDATA_IN_0,
0731     GPIO30_AC97_SDATA_OUT,
0732     GPIO31_AC97_SYNC,
0733 
0734     /* FP Backlight */
0735     GPIO9_GPIO,                 /* VIPER_BCKLIGHT_EN_GPIO */
0736     GPIO10_GPIO,                /* VIPER_LCD_EN_GPIO */
0737     GPIO16_PWM0_OUT,
0738 
0739     /* Ethernet PHY Ready */
0740     GPIO18_RDY,
0741 
0742     /* Serial shutdown */
0743     GPIO12_GPIO | MFP_LPM_DRIVE_HIGH,   /* VIPER_UART_SHDN_GPIO */
0744 
0745     /* Compact-Flash / PC104 */
0746     GPIO48_nPOE,
0747     GPIO49_nPWE,
0748     GPIO50_nPIOR,
0749     GPIO51_nPIOW,
0750     GPIO52_nPCE_1,
0751     GPIO53_nPCE_2,
0752     GPIO54_nPSKTSEL,
0753     GPIO55_nPREG,
0754     GPIO56_nPWAIT,
0755     GPIO57_nIOIS16,
0756     GPIO8_GPIO,             /* VIPER_CF_RDY_GPIO */
0757     GPIO32_GPIO,                /* VIPER_CF_CD_GPIO */
0758     GPIO82_GPIO,                /* VIPER_CF_POWER_GPIO */
0759 
0760     /* Integrated UPS control */
0761     GPIO20_GPIO,                /* VIPER_UPS_GPIO */
0762 
0763     /* Vcc regulator control */
0764     GPIO6_GPIO,             /* VIPER_PSU_DATA_GPIO */
0765     GPIO11_GPIO,                /* VIPER_PSU_CLK_GPIO */
0766     GPIO19_GPIO,                /* VIPER_PSU_nCS_LD_GPIO */
0767 
0768     /* i2c busses */
0769     GPIO26_GPIO,                /* VIPER_TPM_I2C_SDA_GPIO */
0770     GPIO27_GPIO,                /* VIPER_TPM_I2C_SCL_GPIO */
0771     GPIO83_GPIO,                /* VIPER_RTC_I2C_SDA_GPIO */
0772     GPIO84_GPIO,                /* VIPER_RTC_I2C_SCL_GPIO */
0773 
0774     /* PC/104 Interrupt */
0775     GPIO1_GPIO | WAKEUP_ON_EDGE_RISE,   /* VIPER_CPLD_GPIO */
0776 };
0777 
0778 static unsigned long viper_tpm;
0779 
0780 static int __init viper_tpm_setup(char *str)
0781 {
0782     return kstrtoul(str, 10, &viper_tpm) >= 0;
0783 }
0784 
0785 __setup("tpm=", viper_tpm_setup);
0786 
0787 struct gpiod_lookup_table viper_tpm_i2c_gpiod_table = {
0788     .dev_id = "i2c-gpio.2",
0789     .table = {
0790         GPIO_LOOKUP_IDX("gpio-pxa", VIPER_TPM_I2C_SDA_GPIO,
0791                 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
0792         GPIO_LOOKUP_IDX("gpio-pxa", VIPER_TPM_I2C_SCL_GPIO,
0793                 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
0794     },
0795 };
0796 
0797 static void __init viper_tpm_init(void)
0798 {
0799     struct platform_device *tpm_device;
0800     struct i2c_gpio_platform_data i2c_tpm_data = {
0801         .udelay  = 10,
0802         .timeout = HZ,
0803     };
0804     char *errstr;
0805 
0806     /* Allocate TPM i2c bus if requested */
0807     if (!viper_tpm)
0808         return;
0809 
0810     gpiod_add_lookup_table(&viper_tpm_i2c_gpiod_table);
0811     tpm_device = platform_device_alloc("i2c-gpio", 2);
0812     if (tpm_device) {
0813         if (!platform_device_add_data(tpm_device,
0814                           &i2c_tpm_data,
0815                           sizeof(i2c_tpm_data))) {
0816             if (platform_device_add(tpm_device)) {
0817                 errstr = "register TPM i2c bus";
0818                 goto error_free_tpm;
0819             }
0820         } else {
0821             errstr = "allocate TPM i2c bus data";
0822             goto error_free_tpm;
0823         }
0824     } else {
0825         errstr = "allocate TPM i2c device";
0826         goto error_tpm;
0827     }
0828 
0829     return;
0830 
0831 error_free_tpm:
0832     kfree(tpm_device);
0833 error_tpm:
0834     pr_err("viper: Couldn't %s, giving up\n", errstr);
0835 }
0836 
0837 static void __init viper_init_vcore_gpios(void)
0838 {
0839     if (gpio_request(VIPER_PSU_DATA_GPIO, "PSU data"))
0840         goto err_request_data;
0841 
0842     if (gpio_request(VIPER_PSU_CLK_GPIO, "PSU clock"))
0843         goto err_request_clk;
0844 
0845     if (gpio_request(VIPER_PSU_nCS_LD_GPIO, "PSU cs"))
0846         goto err_request_cs;
0847 
0848     if (gpio_direction_output(VIPER_PSU_DATA_GPIO, 0) ||
0849         gpio_direction_output(VIPER_PSU_CLK_GPIO, 0) ||
0850         gpio_direction_output(VIPER_PSU_nCS_LD_GPIO, 0))
0851         goto err_dir;
0852 
0853     /* c/should assume redboot set the correct level ??? */
0854     viper_set_core_cpu_voltage(pxa25x_get_clk_frequency_khz(0), 1);
0855 
0856     return;
0857 
0858 err_dir:
0859     gpio_free(VIPER_PSU_nCS_LD_GPIO);
0860 err_request_cs:
0861     gpio_free(VIPER_PSU_CLK_GPIO);
0862 err_request_clk:
0863     gpio_free(VIPER_PSU_DATA_GPIO);
0864 err_request_data:
0865     pr_err("viper: Failed to setup vcore control GPIOs\n");
0866 }
0867 
0868 static void __init viper_init_serial_gpio(void)
0869 {
0870     if (gpio_request(VIPER_UART_SHDN_GPIO, "UARTs shutdown"))
0871         goto err_request;
0872 
0873     if (gpio_direction_output(VIPER_UART_SHDN_GPIO, 0))
0874         goto err_dir;
0875 
0876     return;
0877 
0878 err_dir:
0879     gpio_free(VIPER_UART_SHDN_GPIO);
0880 err_request:
0881     pr_err("viper: Failed to setup UART shutdown GPIO\n");
0882 }
0883 
0884 #ifdef CONFIG_CPU_FREQ
0885 static int viper_cpufreq_notifier(struct notifier_block *nb,
0886                   unsigned long val, void *data)
0887 {
0888     struct cpufreq_freqs *freq = data;
0889 
0890     /* TODO: Adjust timings??? */
0891 
0892     switch (val) {
0893     case CPUFREQ_PRECHANGE:
0894         if (freq->old < freq->new) {
0895             /* we are getting faster so raise the voltage
0896              * before we change freq */
0897             viper_set_core_cpu_voltage(freq->new, 0);
0898         }
0899         break;
0900     case CPUFREQ_POSTCHANGE:
0901         if (freq->old > freq->new) {
0902             /* we are slowing down so drop the power
0903              * after we change freq */
0904             viper_set_core_cpu_voltage(freq->new, 0);
0905         }
0906         break;
0907     default:
0908         /* ignore */
0909         break;
0910     }
0911 
0912     return 0;
0913 }
0914 
0915 static struct notifier_block viper_cpufreq_notifier_block = {
0916     .notifier_call  = viper_cpufreq_notifier
0917 };
0918 
0919 static void __init viper_init_cpufreq(void)
0920 {
0921     if (cpufreq_register_notifier(&viper_cpufreq_notifier_block,
0922                       CPUFREQ_TRANSITION_NOTIFIER))
0923         pr_err("viper: Failed to setup cpufreq notifier\n");
0924 }
0925 #else
0926 static inline void viper_init_cpufreq(void) {}
0927 #endif
0928 
0929 static void viper_power_off(void)
0930 {
0931     pr_notice("Shutting off UPS\n");
0932     gpio_set_value(VIPER_UPS_GPIO, 1);
0933     /* Spin to death... */
0934     while (1);
0935 }
0936 
0937 static void __init viper_init(void)
0938 {
0939     u8 version;
0940 
0941     pm_power_off = viper_power_off;
0942 
0943     pxa2xx_mfp_config(ARRAY_AND_SIZE(viper_pin_config));
0944 
0945     pxa_set_ffuart_info(NULL);
0946     pxa_set_btuart_info(NULL);
0947     pxa_set_stuart_info(NULL);
0948 
0949     /* Wake-up serial console */
0950     viper_init_serial_gpio();
0951 
0952     pxa_set_fb_info(NULL, &fb_info);
0953 
0954     /* v1 hardware cannot use the datacs line */
0955     version = viper_hw_version();
0956     if (version == 0)
0957         smc91x_device.num_resources--;
0958 
0959     pxa_set_i2c_info(NULL);
0960     gpiod_add_lookup_table(&viper_i2c_gpiod_table);
0961     pwm_add_table(viper_pwm_lookup, ARRAY_SIZE(viper_pwm_lookup));
0962     platform_add_devices(viper_devs, ARRAY_SIZE(viper_devs));
0963 
0964     viper_init_vcore_gpios();
0965     viper_init_cpufreq();
0966 
0967     register_syscore_ops(&viper_cpu_syscore_ops);
0968 
0969     if (version) {
0970         pr_info("viper: hardware v%di%d detected. "
0971             "CPLD revision %d.\n",
0972             VIPER_BOARD_VERSION(version),
0973             VIPER_BOARD_ISSUE(version),
0974             VIPER_CPLD_REVISION(version));
0975         system_rev = (VIPER_BOARD_VERSION(version) << 8) |
0976                  (VIPER_BOARD_ISSUE(version) << 4) |
0977                  VIPER_CPLD_REVISION(version);
0978     } else {
0979         pr_info("viper: No version register.\n");
0980     }
0981 
0982     i2c_register_board_info(1, ARRAY_AND_SIZE(viper_i2c_devices));
0983 
0984     viper_tpm_init();
0985     pxa_set_ac97_info(NULL);
0986 }
0987 
0988 static struct map_desc viper_io_desc[] __initdata = {
0989     {
0990         .virtual = VIPER_CPLD_BASE,
0991         .pfn     = __phys_to_pfn(VIPER_CPLD_PHYS),
0992         .length  = 0x00300000,
0993         .type    = MT_DEVICE,
0994     },
0995     {
0996         .virtual = VIPER_PC104IO_BASE,
0997         .pfn     = __phys_to_pfn(0x30000000),
0998         .length  = 0x00800000,
0999         .type    = MT_DEVICE,
1000     },
1001     {
1002         /*
1003          * ISA I/O space mapping:
1004          * -  ports 0x0000-0x0fff are PC/104
1005          * -  ports 0x10000-0x10fff are PCMCIA slot 1
1006          * -  ports 0x11000-0x11fff are PC/104
1007          */
1008         .virtual = PCI_IO_VIRT_BASE,
1009         .pfn     = __phys_to_pfn(0x30000000),
1010         .length  = 0x1000,
1011         .type    = MT_DEVICE,
1012     },
1013 };
1014 
1015 static void __init viper_map_io(void)
1016 {
1017     pxa25x_map_io();
1018 
1019     iotable_init(viper_io_desc, ARRAY_SIZE(viper_io_desc));
1020 
1021     PCFR |= PCFR_OPDE;
1022 }
1023 
1024 MACHINE_START(VIPER, "Arcom/Eurotech VIPER SBC")
1025     /* Maintainer: Marc Zyngier <maz@misterjones.org> */
1026     .atag_offset    = 0x100,
1027     .map_io     = viper_map_io,
1028     .nr_irqs    = PXA_NR_IRQS,
1029     .init_irq   = viper_init_irq,
1030     .handle_irq = pxa25x_handle_irq,
1031     .init_time  = pxa_timer_init,
1032     .init_machine   = viper_init,
1033     .restart    = pxa_restart,
1034 MACHINE_END
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