1 // SPDX-License-Identifier: GPL-2.0-only
3 // Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
9 // Baikal-T1 DW APB SPI and System Boot SPI driver
24 #include <linux/spi/spi-mem.h>
27 #include "spi-dw.h"
52 	struct dw_spi_bt1 *dwsbt1 = to_dw_spi_bt1(desc->mem->spi->controller);  in dw_spi_bt1_dirmap_create()
54 	if (!dwsbt1->map ||  in dw_spi_bt1_dirmap_create()
55 	    !dwsbt1->dws.mem_ops.supports_op(desc->mem, &desc->info.op_tmpl))  in dw_spi_bt1_dirmap_create()
56 		return -EOPNOTSUPP;  in dw_spi_bt1_dirmap_create()
60 	 * mapped flash memory bounds and the operation is read-only.  in dw_spi_bt1_dirmap_create()
62 	if (desc->info.offset + desc->info.length > dwsbt1->map_len ||  in dw_spi_bt1_dirmap_create()
63 	    desc->info.op_tmpl.data.dir != SPI_MEM_DATA_IN)  in dw_spi_bt1_dirmap_create()
64 		return -EOPNOTSUPP;  in dw_spi_bt1_dirmap_create()
71  * That's why we have to create a dedicated read-method to copy data from there
85 		chunk = min_t(size_t, 4 - shift, len);  in dw_spi_bt1_dirmap_copy_from_map()
86 		data = readl_relaxed(from - shift);  in dw_spi_bt1_dirmap_copy_from_map()
90 		len -= chunk;  in dw_spi_bt1_dirmap_copy_from_map()
98 		len -= 4;  in dw_spi_bt1_dirmap_copy_from_map()
110 	struct dw_spi_bt1 *dwsbt1 = to_dw_spi_bt1(desc->mem->spi->controller);  in dw_spi_bt1_dirmap_read()
111 	struct dw_spi *dws = &dwsbt1->dws;  in dw_spi_bt1_dirmap_read()
112 	struct spi_mem *mem = desc->mem;  in dw_spi_bt1_dirmap_read()
120 	if (offs >= dwsbt1->map_len || !len)  in dw_spi_bt1_dirmap_read()
123 	len = min_t(size_t, len, dwsbt1->map_len - offs);  in dw_spi_bt1_dirmap_read()
129 	cfg.freq = mem->spi->max_speed_hz;  in dw_spi_bt1_dirmap_read()
131 	/* Make sure the corresponding CS is de-asserted on transmission */  in dw_spi_bt1_dirmap_read()
132 	dw_spi_set_cs(mem->spi, false);  in dw_spi_bt1_dirmap_read()
136 	dw_spi_update_config(dws, mem->spi, &cfg);  in dw_spi_bt1_dirmap_read()
148 	ret = mux_control_select(dwsbt1->mux, BT1_BOOT_DIRMAP);  in dw_spi_bt1_dirmap_read()
152 	dw_spi_bt1_dirmap_copy_from_map(buf, dwsbt1->map + offs, len);  in dw_spi_bt1_dirmap_read()
154 	mux_control_deselect(dwsbt1->mux);  in dw_spi_bt1_dirmap_read()
156 	dw_spi_set_cs(mem->spi, true);  in dw_spi_bt1_dirmap_read()
168 	struct dw_spi *dws = &dwsbt1->dws;  in dw_spi_bt1_std_init()
170 	dws->irq = platform_get_irq(pdev, 0);  in dw_spi_bt1_std_init()
171 	if (dws->irq < 0)  in dw_spi_bt1_std_init()
172 		return dws->irq;  in dw_spi_bt1_std_init()
174 	dws->num_cs = 4;  in dw_spi_bt1_std_init()
177 	 * Baikal-T1 Normal SPI Controllers don't always keep up with full SPI  in dw_spi_bt1_std_init()
183 	dws->max_mem_freq = 20000000U;  in dw_spi_bt1_std_init()
194 	struct dw_spi *dws = &dwsbt1->dws;  in dw_spi_bt1_sys_init()
197 	 * Baikal-T1 System Boot Controller is equipped with a mux, which  in dw_spi_bt1_sys_init()
201 	 * (on idle-state).  in dw_spi_bt1_sys_init()
203 	dwsbt1->mux = devm_mux_control_get(&pdev->dev, NULL);  in dw_spi_bt1_sys_init()
204 	if (IS_ERR(dwsbt1->mux))  in dw_spi_bt1_sys_init()
205 		return PTR_ERR(dwsbt1->mux);  in dw_spi_bt1_sys_init()
212 	 * use it concurrently with time-critical tasks (like the SPI memory  in dw_spi_bt1_sys_init()
218 		dwsbt1->map = devm_ioremap_resource(&pdev->dev, mem);  in dw_spi_bt1_sys_init()
219 		if (!IS_ERR(dwsbt1->map)) {  in dw_spi_bt1_sys_init()
220 			dwsbt1->map_len = (mem->end - mem->start + 1);  in dw_spi_bt1_sys_init()
221 			dws->mem_ops.dirmap_create = dw_spi_bt1_dirmap_create;  in dw_spi_bt1_sys_init()
222 			dws->mem_ops.dirmap_read = dw_spi_bt1_dirmap_read;  in dw_spi_bt1_sys_init()
224 			dwsbt1->map = NULL;  in dw_spi_bt1_sys_init()
233 	dws->irq = IRQ_NOTCONNECTED;  in dw_spi_bt1_sys_init()
234 	dws->num_cs = 1;  in dw_spi_bt1_sys_init()
237 	 * Baikal-T1 System Boot SPI Controller doesn't keep up with the full  in dw_spi_bt1_sys_init()
245 		dws->max_mem_freq = 10000000U;  in dw_spi_bt1_sys_init()
247 		dws->max_mem_freq = 20000000U;  in dw_spi_bt1_sys_init()
260 	dwsbt1 = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_bt1), GFP_KERNEL);  in dw_spi_bt1_probe()
262 		return -ENOMEM;  in dw_spi_bt1_probe()
264 	dws = &dwsbt1->dws;  in dw_spi_bt1_probe()
266 	dws->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);  in dw_spi_bt1_probe()
267 	if (IS_ERR(dws->regs))  in dw_spi_bt1_probe()
268 		return PTR_ERR(dws->regs);  in dw_spi_bt1_probe()
270 	dws->paddr = mem->start;  in dw_spi_bt1_probe()
272 	dwsbt1->clk = devm_clk_get(&pdev->dev, NULL);  in dw_spi_bt1_probe()
273 	if (IS_ERR(dwsbt1->clk))  in dw_spi_bt1_probe()
274 		return PTR_ERR(dwsbt1->clk);  in dw_spi_bt1_probe()
276 	ret = clk_prepare_enable(dwsbt1->clk);  in dw_spi_bt1_probe()
280 	dws->bus_num = pdev->id;  in dw_spi_bt1_probe()
281 	dws->reg_io_width = 4;  in dw_spi_bt1_probe()
282 	dws->max_freq = clk_get_rate(dwsbt1->clk);  in dw_spi_bt1_probe()
283 	if (!dws->max_freq)  in dw_spi_bt1_probe()
286 	init_func = device_get_match_data(&pdev->dev);  in dw_spi_bt1_probe()
291 	pm_runtime_enable(&pdev->dev);  in dw_spi_bt1_probe()
293 	ret = dw_spi_add_host(&pdev->dev, dws);  in dw_spi_bt1_probe()
302 	clk_disable_unprepare(dwsbt1->clk);  in dw_spi_bt1_probe()
311 	dw_spi_remove_host(&dwsbt1->dws);  in dw_spi_bt1_remove()
313 	pm_runtime_disable(&pdev->dev);  in dw_spi_bt1_remove()
315 	clk_disable_unprepare(dwsbt1->clk);  in dw_spi_bt1_remove()
321 	{ .compatible = "baikal,bt1-ssi", .data = dw_spi_bt1_std_init},
322 	{ .compatible = "baikal,bt1-sys-ssi", .data = dw_spi_bt1_sys_init},
331 		.name		= "bt1-sys-ssi",
338 MODULE_DESCRIPTION("Baikal-T1 System Boot SPI Controller driver");