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 22 static u8 async_cs, sync_cs; 23 static unsigned refclk_psec; 24 25 static 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 32 static 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 46 static 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 72 static 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 */ 100 static int 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); 121 done: 122 return status; 123 } 124 125 static struct resource tusb_resources[] = { 126 /* Order is significant! The start/end fields 127 * are updated during setup.. 128 */ 129 { /* Asynchronous access */ 130 .flags = IORESOURCE_MEM, 131 }, 132 { /* Synchronous access */ 133 .flags = IORESOURCE_MEM, 134 }, 135 { /* IRQ */ 136 .name = "mc", 137 .flags = IORESOURCE_IRQ, 138 }, 139 }; 140 141 static u64 tusb_dmamask = ~(u32)0; 142 143 static struct platform_device tusb_device = { 144 .name = "musb-tusb", 145 .id = -1, 146 .dev = { 147 .dma_mask = &tusb_dmamask, 148 .coherent_dma_mask = 0xffffffff, 149 }, 150 .num_resources = ARRAY_SIZE(tusb_resources), 151 .resource = tusb_resources, 152 }; 153 154 155 /* this may be called only from board-*.c setup code */ 156 int __init tusb6010_setup_interface(struct musb_hdrc_platform_data *data, 157 unsigned ps_refclk, unsigned waitpin, 158 unsigned async, unsigned sync, 159 unsigned irq, unsigned dmachan) 160 { 161 int status; 162 static char error[] __initdata = 163 KERN_ERR "tusb6010 init error %d, %d\n"; 164 165 /* ASYNC region, primarily for PIO */ 166 status = gpmc_cs_request(async, SZ_16M, (unsigned long *) 167 &tusb_resources[0].start); 168 if (status < 0) { 169 printk(error, 1, status); 170 return status; 171 } 172 tusb_resources[0].end = tusb_resources[0].start + 0x9ff; 173 tusb_async.wait_pin = waitpin; 174 async_cs = async; 175 176 status = gpmc_cs_program_settings(async_cs, &tusb_async); 177 if (status < 0) 178 return status; 179 180 /* SYNC region, primarily for DMA */ 181 status = gpmc_cs_request(sync, SZ_16M, (unsigned long *) 182 &tusb_resources[1].start); 183 if (status < 0) { 184 printk(error, 2, status); 185 return status; 186 } 187 tusb_resources[1].end = tusb_resources[1].start + 0x9ff; 188 tusb_sync.wait_pin = waitpin; 189 sync_cs = sync; 190 191 status = gpmc_cs_program_settings(sync_cs, &tusb_sync); 192 if (status < 0) 193 return status; 194 195 /* IRQ */ 196 status = gpio_request_one(irq, GPIOF_IN, "TUSB6010 irq"); 197 if (status < 0) { 198 printk(error, 3, status); 199 return status; 200 } 201 tusb_resources[2].start = gpio_to_irq(irq); 202 203 /* set up memory timings ... can speed them up later */ 204 if (!ps_refclk) { 205 printk(error, 4, status); 206 return -ENODEV; 207 } 208 refclk_psec = ps_refclk; 209 status = tusb6010_platform_retime(1); 210 if (status < 0) { 211 printk(error, 5, status); 212 return status; 213 } 214 215 /* finish device setup ... */ 216 if (!data) { 217 printk(error, 6, status); 218 return -ENODEV; 219 } 220 tusb_device.dev.platform_data = data; 221 222 /* so far so good ... register the device */ 223 status = platform_device_register(&tusb_device); 224 if (status < 0) { 225 printk(error, 7, status); 226 return status; 227 } 228 return 0; 229 } 230