2  * Programmable Real-Time Unit Sub System (PRUSS) UIO driver (uio_pruss)
4  * This driver exports PRUSS host event out interrupts and PRUSS, L3 RAM,
5  * and DDR RAM to user space for applications interacting with PRUSS firmware
7  * Copyright (C) 2010-11 Texas Instruments Incorporated - http://www.ti.com/
26 #include <linux/dma-mapping.h>
43  * Host event IRQ numbers from PRUSS - PRUSS can generate up to 8 interrupt
44  * events to AINTC of ARM host processor - which can be used for IPC b/w PRUSS
78 	struct uio_pruss_dev *gdev = info->priv;  in pruss_handler()
79 	int intr_bit = (irq - gdev->hostirq_start + 2);  in pruss_handler()
81 	void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base;  in pruss_handler()
98 	struct uio_info *p = gdev->info;  in pruss_cleanup()
102 		kfree(p->name);  in pruss_cleanup()
104 	iounmap(gdev->prussio_vaddr);  in pruss_cleanup()
105 	if (gdev->ddr_vaddr) {  in pruss_cleanup()
106 		dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,  in pruss_cleanup()
107 			gdev->ddr_paddr);  in pruss_cleanup()
109 	if (gdev->sram_vaddr)  in pruss_cleanup()
110 		gen_pool_free(gdev->sram_pool,  in pruss_cleanup()
111 			      gdev->sram_vaddr,  in pruss_cleanup()
113 	kfree(gdev->info);  in pruss_cleanup()
114 	clk_disable(gdev->pruss_clk);  in pruss_cleanup()
115 	clk_put(gdev->pruss_clk);  in pruss_cleanup()
124 	struct device *dev = &pdev->dev;  in pruss_probe()
130 		return -ENOMEM;  in pruss_probe()
132 	gdev->info = kcalloc(MAX_PRUSS_EVT, sizeof(*p), GFP_KERNEL);  in pruss_probe()
133 	if (!gdev->info) {  in pruss_probe()
134 		ret = -ENOMEM;  in pruss_probe()
138 	/* Power on PRU in case its not done as part of boot-loader */  in pruss_probe()
139 	gdev->pruss_clk = clk_get(dev, "pruss");  in pruss_probe()
140 	if (IS_ERR(gdev->pruss_clk)) {  in pruss_probe()
142 		ret = PTR_ERR(gdev->pruss_clk);  in pruss_probe()
146 	ret = clk_enable(gdev->pruss_clk);  in pruss_probe()
154 		dev_err(dev, "No PRUSS I/O resource specified\n");  in pruss_probe()
155 		ret = -EIO;  in pruss_probe()
159 	if (!regs_prussio->start) {  in pruss_probe()
161 		ret = -EIO;  in pruss_probe()
165 	if (pdata->sram_pool) {  in pruss_probe()
166 		gdev->sram_pool = pdata->sram_pool;  in pruss_probe()
167 		gdev->sram_vaddr =  in pruss_probe()
168 			(unsigned long)gen_pool_dma_alloc(gdev->sram_pool,  in pruss_probe()
169 					sram_pool_sz, &gdev->sram_paddr);  in pruss_probe()
170 		if (!gdev->sram_vaddr) {  in pruss_probe()
172 			ret = -ENOMEM;  in pruss_probe()
177 	gdev->ddr_vaddr = dma_alloc_coherent(dev, extram_pool_sz,  in pruss_probe()
178 				&(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA);  in pruss_probe()
179 	if (!gdev->ddr_vaddr) {  in pruss_probe()
181 		ret = -ENOMEM;  in pruss_probe()
186 	gdev->prussio_vaddr = ioremap(regs_prussio->start, len);  in pruss_probe()
187 	if (!gdev->prussio_vaddr) {  in pruss_probe()
188 		dev_err(dev, "Can't remap PRUSS I/O  address range\n");  in pruss_probe()
189 		ret = -ENOMEM;  in pruss_probe()
193 	gdev->pintc_base = pdata->pintc_base;  in pruss_probe()
194 	gdev->hostirq_start = platform_get_irq(pdev, 0);  in pruss_probe()
196 	for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) {  in pruss_probe()
197 		p->mem[0].addr = regs_prussio->start;  in pruss_probe()
198 		p->mem[0].size = resource_size(regs_prussio);  in pruss_probe()
199 		p->mem[0].memtype = UIO_MEM_PHYS;  in pruss_probe()
201 		p->mem[1].addr = gdev->sram_paddr;  in pruss_probe()
202 		p->mem[1].size = sram_pool_sz;  in pruss_probe()
203 		p->mem[1].memtype = UIO_MEM_PHYS;  in pruss_probe()
205 		p->mem[2].addr = gdev->ddr_paddr;  in pruss_probe()
206 		p->mem[2].size = extram_pool_sz;  in pruss_probe()
207 		p->mem[2].memtype = UIO_MEM_PHYS;  in pruss_probe()
209 		p->name = kasprintf(GFP_KERNEL, "pruss_evt%d", cnt);  in pruss_probe()
210 		p->version = DRV_VERSION;  in pruss_probe()
212 		/* Register PRUSS IRQ lines */  in pruss_probe()
213 		p->irq = gdev->hostirq_start + cnt;  in pruss_probe()
214 		p->handler = pruss_handler;  in pruss_probe()
215 		p->priv = gdev;  in pruss_probe()
219 			kfree(p->name);  in pruss_probe()
228 	for (i = 0, p = gdev->info; i < cnt; i++, p++) {  in pruss_probe()
230 		kfree(p->name);  in pruss_probe()
232 	iounmap(gdev->prussio_vaddr);  in pruss_probe()
234 	dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,  in pruss_probe()
235 			  gdev->ddr_paddr);  in pruss_probe()
237 	if (pdata->sram_pool)  in pruss_probe()
238 		gen_pool_free(gdev->sram_pool, gdev->sram_vaddr, sram_pool_sz);  in pruss_probe()
240 	clk_disable(gdev->pruss_clk);  in pruss_probe()
242 	clk_put(gdev->pruss_clk);  in pruss_probe()
244 	kfree(gdev->info);  in pruss_probe()
255 	pruss_cleanup(&dev->dev, gdev);  in pruss_remove()
271 MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>");
272 MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>");