| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * linux/arch/arm/mach-omap2/usb-tusb6010.c |
| * |
| * Copyright (C) 2006 Nokia Corporation |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| #include <linux/errno.h> |
| #include <linux/delay.h> |
| #include <linux/platform_device.h> |
| #include <linux/gpio.h> |
| #include <linux/export.h> |
| #include <linux/platform_data/usb-omap.h> |
| |
| #include <linux/usb/musb.h> |
| |
| #include "gpmc.h" |
| |
| static u8 async_cs, sync_cs; |
| static unsigned refclk_psec; |
| |
| static struct gpmc_settings tusb_async = { |
| .wait_on_read = true, |
| .wait_on_write = true, |
| .device_width = GPMC_DEVWIDTH_16BIT, |
| .mux_add_data = GPMC_MUX_AD, |
| }; |
| |
| static struct gpmc_settings tusb_sync = { |
| .burst_read = true, |
| .burst_write = true, |
| .sync_read = true, |
| .sync_write = true, |
| .wait_on_read = true, |
| .wait_on_write = true, |
| .burst_len = GPMC_BURST_16, |
| .device_width = GPMC_DEVWIDTH_16BIT, |
| .mux_add_data = GPMC_MUX_AD, |
| }; |
| |
| /* NOTE: timings are from tusb 6010 datasheet Rev 1.8, 12-Sept 2006 */ |
| |
| static int tusb_set_async_mode(unsigned sysclk_ps) |
| { |
| struct gpmc_device_timings dev_t; |
| struct gpmc_timings t; |
| unsigned t_acsnh_advnh = sysclk_ps + 3000; |
| |
| memset(&dev_t, 0, sizeof(dev_t)); |
| |
| dev_t.t_ceasu = 8 * 1000; |
| dev_t.t_avdasu = t_acsnh_advnh - 7000; |
| dev_t.t_ce_avd = 1000; |
| dev_t.t_avdp_r = t_acsnh_advnh; |
| dev_t.t_oeasu = t_acsnh_advnh + 1000; |
| dev_t.t_oe = 300; |
| dev_t.t_cez_r = 7000; |
| dev_t.t_cez_w = dev_t.t_cez_r; |
| dev_t.t_avdp_w = t_acsnh_advnh; |
| dev_t.t_weasu = t_acsnh_advnh + 1000; |
| dev_t.t_wpl = 300; |
| dev_t.cyc_aavdh_we = 1; |
| |
| gpmc_calc_timings(&t, &tusb_async, &dev_t); |
| |
| return gpmc_cs_set_timings(async_cs, &t, &tusb_async); |
| } |
| |
| static int tusb_set_sync_mode(unsigned sysclk_ps) |
| { |
| struct gpmc_device_timings dev_t; |
| struct gpmc_timings t; |
| unsigned t_scsnh_advnh = sysclk_ps + 3000; |
| |
| memset(&dev_t, 0, sizeof(dev_t)); |
| |
| dev_t.clk = 11100; |
| dev_t.t_bacc = 1000; |
| dev_t.t_ces = 1000; |
| dev_t.t_ceasu = 8 * 1000; |
| dev_t.t_avdasu = t_scsnh_advnh - 7000; |
| dev_t.t_ce_avd = 1000; |
| dev_t.t_avdp_r = t_scsnh_advnh; |
| dev_t.cyc_aavdh_oe = 3; |
| dev_t.cyc_oe = 5; |
| dev_t.t_ce_rdyz = 7000; |
| dev_t.t_avdp_w = t_scsnh_advnh; |
| dev_t.cyc_aavdh_we = 3; |
| dev_t.cyc_wpl = 6; |
| |
| gpmc_calc_timings(&t, &tusb_sync, &dev_t); |
| |
| return gpmc_cs_set_timings(sync_cs, &t, &tusb_sync); |
| } |
| |
| /* tusb driver calls this when it changes the chip's clocking */ |
| int tusb6010_platform_retime(unsigned is_refclk) |
| { |
| static const char error[] = |
| KERN_ERR "tusb6010 %s retime error %d\n"; |
| |
| unsigned sysclk_ps; |
| int status; |
| |
| if (!refclk_psec) |
| return -ENODEV; |
| |
| sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60; |
| |
| status = tusb_set_async_mode(sysclk_ps); |
| if (status < 0) { |
| printk(error, "async", status); |
| goto done; |
| } |
| status = tusb_set_sync_mode(sysclk_ps); |
| if (status < 0) |
| printk(error, "sync", status); |
| done: |
| return status; |
| } |
| EXPORT_SYMBOL_GPL(tusb6010_platform_retime); |
| |
| static struct resource tusb_resources[] = { |
| /* Order is significant! The start/end fields |
| * are updated during setup.. |
| */ |
| { /* Asynchronous access */ |
| .flags = IORESOURCE_MEM, |
| }, |
| { /* Synchronous access */ |
| .flags = IORESOURCE_MEM, |
| }, |
| { /* IRQ */ |
| .name = "mc", |
| .flags = IORESOURCE_IRQ, |
| }, |
| }; |
| |
| static u64 tusb_dmamask = ~(u32)0; |
| |
| static struct platform_device tusb_device = { |
| .name = "musb-tusb", |
| .id = -1, |
| .dev = { |
| .dma_mask = &tusb_dmamask, |
| .coherent_dma_mask = 0xffffffff, |
| }, |
| .num_resources = ARRAY_SIZE(tusb_resources), |
| .resource = tusb_resources, |
| }; |
| |
| |
| /* this may be called only from board-*.c setup code */ |
| int __init |
| tusb6010_setup_interface(struct musb_hdrc_platform_data *data, |
| unsigned ps_refclk, unsigned waitpin, |
| unsigned async, unsigned sync, |
| unsigned irq, unsigned dmachan) |
| { |
| int status; |
| static char error[] __initdata = |
| KERN_ERR "tusb6010 init error %d, %d\n"; |
| |
| /* ASYNC region, primarily for PIO */ |
| status = gpmc_cs_request(async, SZ_16M, (unsigned long *) |
| &tusb_resources[0].start); |
| if (status < 0) { |
| printk(error, 1, status); |
| return status; |
| } |
| tusb_resources[0].end = tusb_resources[0].start + 0x9ff; |
| tusb_async.wait_pin = waitpin; |
| async_cs = async; |
| |
| status = gpmc_cs_program_settings(async_cs, &tusb_async); |
| if (status < 0) |
| return status; |
| |
| /* SYNC region, primarily for DMA */ |
| status = gpmc_cs_request(sync, SZ_16M, (unsigned long *) |
| &tusb_resources[1].start); |
| if (status < 0) { |
| printk(error, 2, status); |
| return status; |
| } |
| tusb_resources[1].end = tusb_resources[1].start + 0x9ff; |
| tusb_sync.wait_pin = waitpin; |
| sync_cs = sync; |
| |
| status = gpmc_cs_program_settings(sync_cs, &tusb_sync); |
| if (status < 0) |
| return status; |
| |
| /* IRQ */ |
| status = gpio_request_one(irq, GPIOF_IN, "TUSB6010 irq"); |
| if (status < 0) { |
| printk(error, 3, status); |
| return status; |
| } |
| tusb_resources[2].start = gpio_to_irq(irq); |
| |
| /* set up memory timings ... can speed them up later */ |
| if (!ps_refclk) { |
| printk(error, 4, status); |
| return -ENODEV; |
| } |
| refclk_psec = ps_refclk; |
| status = tusb6010_platform_retime(1); |
| if (status < 0) { |
| printk(error, 5, status); |
| return status; |
| } |
| |
| /* finish device setup ... */ |
| if (!data) { |
| printk(error, 6, status); |
| return -ENODEV; |
| } |
| tusb_device.dev.platform_data = data; |
| |
| /* so far so good ... register the device */ |
| status = platform_device_register(&tusb_device); |
| if (status < 0) { |
| printk(error, 7, status); |
| return status; |
| } |
| return 0; |
| } |