1 // SPDX-License-Identifier: GPL-2.0-only
3  * Programmable Real-Time Unit Sub System (PRUSS) UIO driver (uio_pruss)
5  * This driver exports PRUSS host event out interrupts and PRUSS, L3 RAM,
6  * and DDR RAM to user space for applications interacting with PRUSS firmware
8  * Copyright (C) 2010-11 Texas Instruments Incorporated - http://www.ti.com/
18 #include <linux/dma-mapping.h>
35  * Host event IRQ numbers from PRUSS - PRUSS can generate up to 8 interrupt
36  * events to AINTC of ARM host processor - which can be used for IPC b/w PRUSS
70 	struct uio_pruss_dev *gdev = info->priv;  in pruss_handler()
71 	int intr_bit = (irq - gdev->hostirq_start + 2);  in pruss_handler()
73 	void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base;  in pruss_handler()
90 	struct uio_info *p = gdev->info;  in pruss_cleanup()
95 	iounmap(gdev->prussio_vaddr);  in pruss_cleanup()
96 	if (gdev->ddr_vaddr) {  in pruss_cleanup()
97 		dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,  in pruss_cleanup()
98 			gdev->ddr_paddr);  in pruss_cleanup()
100 	if (gdev->sram_vaddr)  in pruss_cleanup()
101 		gen_pool_free(gdev->sram_pool,  in pruss_cleanup()
102 			      gdev->sram_vaddr,  in pruss_cleanup()
104 	clk_disable(gdev->pruss_clk);  in pruss_cleanup()
112 	struct device *dev = &pdev->dev;  in pruss_probe()
118 		return -ENOMEM;  in pruss_probe()
120 	gdev->info = devm_kcalloc(dev, MAX_PRUSS_EVT, sizeof(*p), GFP_KERNEL);  in pruss_probe()
121 	if (!gdev->info)  in pruss_probe()
122 		return -ENOMEM;  in pruss_probe()
124 	/* Power on PRU in case its not done as part of boot-loader */  in pruss_probe()
125 	gdev->pruss_clk = devm_clk_get(dev, "pruss");  in pruss_probe()
126 	if (IS_ERR(gdev->pruss_clk)) {  in pruss_probe()
128 		return PTR_ERR(gdev->pruss_clk);  in pruss_probe()
131 	ret = clk_enable(gdev->pruss_clk);  in pruss_probe()
139 		dev_err(dev, "No PRUSS I/O resource specified\n");  in pruss_probe()
140 		ret = -EIO;  in pruss_probe()
144 	if (!regs_prussio->start) {  in pruss_probe()
146 		ret = -EIO;  in pruss_probe()
150 	if (pdata->sram_pool) {  in pruss_probe()
151 		gdev->sram_pool = pdata->sram_pool;  in pruss_probe()
152 		gdev->sram_vaddr =  in pruss_probe()
153 			(unsigned long)gen_pool_dma_alloc(gdev->sram_pool,  in pruss_probe()
154 					sram_pool_sz, &gdev->sram_paddr);  in pruss_probe()
155 		if (!gdev->sram_vaddr) {  in pruss_probe()
157 			ret = -ENOMEM;  in pruss_probe()
162 	gdev->ddr_vaddr = dma_alloc_coherent(dev, extram_pool_sz,  in pruss_probe()
163 				&(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA);  in pruss_probe()
164 	if (!gdev->ddr_vaddr) {  in pruss_probe()
166 		ret = -ENOMEM;  in pruss_probe()
171 	gdev->prussio_vaddr = ioremap(regs_prussio->start, len);  in pruss_probe()
172 	if (!gdev->prussio_vaddr) {  in pruss_probe()
173 		dev_err(dev, "Can't remap PRUSS I/O  address range\n");  in pruss_probe()
174 		ret = -ENOMEM;  in pruss_probe()
182 	gdev->hostirq_start = ret;  in pruss_probe()
183 	gdev->pintc_base = pdata->pintc_base;  in pruss_probe()
185 	for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) {  in pruss_probe()
186 		p->mem[0].addr = regs_prussio->start;  in pruss_probe()
187 		p->mem[0].size = resource_size(regs_prussio);  in pruss_probe()
188 		p->mem[0].memtype = UIO_MEM_PHYS;  in pruss_probe()
190 		p->mem[1].addr = gdev->sram_paddr;  in pruss_probe()
191 		p->mem[1].size = sram_pool_sz;  in pruss_probe()
192 		p->mem[1].memtype = UIO_MEM_PHYS;  in pruss_probe()
194 		p->mem[2].addr = gdev->ddr_paddr;  in pruss_probe()
195 		p->mem[2].size = extram_pool_sz;  in pruss_probe()
196 		p->mem[2].memtype = UIO_MEM_PHYS;  in pruss_probe()
198 		p->name = devm_kasprintf(dev, GFP_KERNEL, "pruss_evt%d", cnt);  in pruss_probe()
199 		p->version = DRV_VERSION;  in pruss_probe()
201 		/* Register PRUSS IRQ lines */  in pruss_probe()
202 		p->irq = gdev->hostirq_start + cnt;  in pruss_probe()
203 		p->handler = pruss_handler;  in pruss_probe()
204 		p->priv = gdev;  in pruss_probe()
215 	for (i = 0, p = gdev->info; i < cnt; i++, p++) {  in pruss_probe()
219 	iounmap(gdev->prussio_vaddr);  in pruss_probe()
221 	dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,  in pruss_probe()
222 			  gdev->ddr_paddr);  in pruss_probe()
224 	if (pdata->sram_pool)  in pruss_probe()
225 		gen_pool_free(gdev->sram_pool, gdev->sram_vaddr, sram_pool_sz);  in pruss_probe()
227 	clk_disable(gdev->pruss_clk);  in pruss_probe()
236 	pruss_cleanup(&dev->dev, gdev);  in pruss_remove()
252 MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>");
253 MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>");