usb-tusb6010.c (5348B)
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * linux/arch/arm/mach-omap2/usb-tusb6010.c 4 * 5 * Copyright (C) 2006 Nokia Corporation 6 */ 7 8#include <linux/err.h> 9#include <linux/string.h> 10#include <linux/types.h> 11#include <linux/errno.h> 12#include <linux/delay.h> 13#include <linux/platform_device.h> 14#include <linux/gpio.h> 15#include <linux/export.h> 16#include <linux/platform_data/usb-omap.h> 17 18#include <linux/usb/musb.h> 19 20#include "gpmc.h" 21 22static u8 async_cs, sync_cs; 23static unsigned refclk_psec; 24 25static struct gpmc_settings tusb_async = { 26 .wait_on_read = true, 27 .wait_on_write = true, 28 .device_width = GPMC_DEVWIDTH_16BIT, 29 .mux_add_data = GPMC_MUX_AD, 30}; 31 32static struct gpmc_settings tusb_sync = { 33 .burst_read = true, 34 .burst_write = true, 35 .sync_read = true, 36 .sync_write = true, 37 .wait_on_read = true, 38 .wait_on_write = true, 39 .burst_len = GPMC_BURST_16, 40 .device_width = GPMC_DEVWIDTH_16BIT, 41 .mux_add_data = GPMC_MUX_AD, 42}; 43 44/* NOTE: timings are from tusb 6010 datasheet Rev 1.8, 12-Sept 2006 */ 45 46static int tusb_set_async_mode(unsigned sysclk_ps) 47{ 48 struct gpmc_device_timings dev_t; 49 struct gpmc_timings t; 50 unsigned t_acsnh_advnh = sysclk_ps + 3000; 51 52 memset(&dev_t, 0, sizeof(dev_t)); 53 54 dev_t.t_ceasu = 8 * 1000; 55 dev_t.t_avdasu = t_acsnh_advnh - 7000; 56 dev_t.t_ce_avd = 1000; 57 dev_t.t_avdp_r = t_acsnh_advnh; 58 dev_t.t_oeasu = t_acsnh_advnh + 1000; 59 dev_t.t_oe = 300; 60 dev_t.t_cez_r = 7000; 61 dev_t.t_cez_w = dev_t.t_cez_r; 62 dev_t.t_avdp_w = t_acsnh_advnh; 63 dev_t.t_weasu = t_acsnh_advnh + 1000; 64 dev_t.t_wpl = 300; 65 dev_t.cyc_aavdh_we = 1; 66 67 gpmc_calc_timings(&t, &tusb_async, &dev_t); 68 69 return gpmc_cs_set_timings(async_cs, &t, &tusb_async); 70} 71 72static int tusb_set_sync_mode(unsigned sysclk_ps) 73{ 74 struct gpmc_device_timings dev_t; 75 struct gpmc_timings t; 76 unsigned t_scsnh_advnh = sysclk_ps + 3000; 77 78 memset(&dev_t, 0, sizeof(dev_t)); 79 80 dev_t.clk = 11100; 81 dev_t.t_bacc = 1000; 82 dev_t.t_ces = 1000; 83 dev_t.t_ceasu = 8 * 1000; 84 dev_t.t_avdasu = t_scsnh_advnh - 7000; 85 dev_t.t_ce_avd = 1000; 86 dev_t.t_avdp_r = t_scsnh_advnh; 87 dev_t.cyc_aavdh_oe = 3; 88 dev_t.cyc_oe = 5; 89 dev_t.t_ce_rdyz = 7000; 90 dev_t.t_avdp_w = t_scsnh_advnh; 91 dev_t.cyc_aavdh_we = 3; 92 dev_t.cyc_wpl = 6; 93 94 gpmc_calc_timings(&t, &tusb_sync, &dev_t); 95 96 return gpmc_cs_set_timings(sync_cs, &t, &tusb_sync); 97} 98 99/* tusb driver calls this when it changes the chip's clocking */ 100int tusb6010_platform_retime(unsigned is_refclk) 101{ 102 static const char error[] = 103 KERN_ERR "tusb6010 %s retime error %d\n"; 104 105 unsigned sysclk_ps; 106 int status; 107 108 if (!refclk_psec) 109 return -ENODEV; 110 111 sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60; 112 113 status = tusb_set_async_mode(sysclk_ps); 114 if (status < 0) { 115 printk(error, "async", status); 116 goto done; 117 } 118 status = tusb_set_sync_mode(sysclk_ps); 119 if (status < 0) 120 printk(error, "sync", status); 121done: 122 return status; 123} 124EXPORT_SYMBOL_GPL(tusb6010_platform_retime); 125 126static struct resource tusb_resources[] = { 127 /* Order is significant! The start/end fields 128 * are updated during setup.. 129 */ 130 { /* Asynchronous access */ 131 .flags = IORESOURCE_MEM, 132 }, 133 { /* Synchronous access */ 134 .flags = IORESOURCE_MEM, 135 }, 136 { /* IRQ */ 137 .name = "mc", 138 .flags = IORESOURCE_IRQ, 139 }, 140}; 141 142static u64 tusb_dmamask = ~(u32)0; 143 144static struct platform_device tusb_device = { 145 .name = "musb-tusb", 146 .id = -1, 147 .dev = { 148 .dma_mask = &tusb_dmamask, 149 .coherent_dma_mask = 0xffffffff, 150 }, 151 .num_resources = ARRAY_SIZE(tusb_resources), 152 .resource = tusb_resources, 153}; 154 155 156/* this may be called only from board-*.c setup code */ 157int __init 158tusb6010_setup_interface(struct musb_hdrc_platform_data *data, 159 unsigned ps_refclk, unsigned waitpin, 160 unsigned async, unsigned sync, 161 unsigned irq, unsigned dmachan) 162{ 163 int status; 164 static char error[] __initdata = 165 KERN_ERR "tusb6010 init error %d, %d\n"; 166 167 /* ASYNC region, primarily for PIO */ 168 status = gpmc_cs_request(async, SZ_16M, (unsigned long *) 169 &tusb_resources[0].start); 170 if (status < 0) { 171 printk(error, 1, status); 172 return status; 173 } 174 tusb_resources[0].end = tusb_resources[0].start + 0x9ff; 175 tusb_async.wait_pin = waitpin; 176 async_cs = async; 177 178 status = gpmc_cs_program_settings(async_cs, &tusb_async); 179 if (status < 0) 180 return status; 181 182 /* SYNC region, primarily for DMA */ 183 status = gpmc_cs_request(sync, SZ_16M, (unsigned long *) 184 &tusb_resources[1].start); 185 if (status < 0) { 186 printk(error, 2, status); 187 return status; 188 } 189 tusb_resources[1].end = tusb_resources[1].start + 0x9ff; 190 tusb_sync.wait_pin = waitpin; 191 sync_cs = sync; 192 193 status = gpmc_cs_program_settings(sync_cs, &tusb_sync); 194 if (status < 0) 195 return status; 196 197 /* IRQ */ 198 status = gpio_request_one(irq, GPIOF_IN, "TUSB6010 irq"); 199 if (status < 0) { 200 printk(error, 3, status); 201 return status; 202 } 203 tusb_resources[2].start = gpio_to_irq(irq); 204 205 /* set up memory timings ... can speed them up later */ 206 if (!ps_refclk) { 207 printk(error, 4, status); 208 return -ENODEV; 209 } 210 refclk_psec = ps_refclk; 211 status = tusb6010_platform_retime(1); 212 if (status < 0) { 213 printk(error, 5, status); 214 return status; 215 } 216 217 /* finish device setup ... */ 218 if (!data) { 219 printk(error, 6, status); 220 return -ENODEV; 221 } 222 tusb_device.dev.platform_data = data; 223 224 /* so far so good ... register the device */ 225 status = platform_device_register(&tusb_device); 226 if (status < 0) { 227 printk(error, 7, status); 228 return status; 229 } 230 return 0; 231}