12aec85b2SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2f1a304e7SPratheesh Gangadhar /*
3f1a304e7SPratheesh Gangadhar * Programmable Real-Time Unit Sub System (PRUSS) UIO driver (uio_pruss)
4f1a304e7SPratheesh Gangadhar *
5f1a304e7SPratheesh Gangadhar * This driver exports PRUSS host event out interrupts and PRUSS, L3 RAM,
6f1a304e7SPratheesh Gangadhar * and DDR RAM to user space for applications interacting with PRUSS firmware
7f1a304e7SPratheesh Gangadhar *
8f1a304e7SPratheesh Gangadhar * Copyright (C) 2010-11 Texas Instruments Incorporated - http://www.ti.com/
9f1a304e7SPratheesh Gangadhar */
10f1a304e7SPratheesh Gangadhar #include <linux/device.h>
11f1a304e7SPratheesh Gangadhar #include <linux/module.h>
12f1a304e7SPratheesh Gangadhar #include <linux/moduleparam.h>
13f1a304e7SPratheesh Gangadhar #include <linux/platform_device.h>
14f1a304e7SPratheesh Gangadhar #include <linux/uio_driver.h>
15f1a304e7SPratheesh Gangadhar #include <linux/platform_data/uio_pruss.h>
16f1a304e7SPratheesh Gangadhar #include <linux/io.h>
17f1a304e7SPratheesh Gangadhar #include <linux/clk.h>
18f1a304e7SPratheesh Gangadhar #include <linux/dma-mapping.h>
1987672676SMatwey V. Kornilov #include <linux/sizes.h>
20f1a304e7SPratheesh Gangadhar #include <linux/slab.h>
212eb2478dSMatt Porter #include <linux/genalloc.h>
22f1a304e7SPratheesh Gangadhar
23f1a304e7SPratheesh Gangadhar #define DRV_NAME "pruss_uio"
24f1a304e7SPratheesh Gangadhar #define DRV_VERSION "1.0"
25f1a304e7SPratheesh Gangadhar
26f1a304e7SPratheesh Gangadhar static int sram_pool_sz = SZ_16K;
27f1a304e7SPratheesh Gangadhar module_param(sram_pool_sz, int, 0);
28f1a304e7SPratheesh Gangadhar MODULE_PARM_DESC(sram_pool_sz, "sram pool size to allocate ");
29f1a304e7SPratheesh Gangadhar
30f1a304e7SPratheesh Gangadhar static int extram_pool_sz = SZ_256K;
31f1a304e7SPratheesh Gangadhar module_param(extram_pool_sz, int, 0);
32f1a304e7SPratheesh Gangadhar MODULE_PARM_DESC(extram_pool_sz, "external ram pool size to allocate");
33f1a304e7SPratheesh Gangadhar
34f1a304e7SPratheesh Gangadhar /*
35f1a304e7SPratheesh Gangadhar * Host event IRQ numbers from PRUSS - PRUSS can generate up to 8 interrupt
36f1a304e7SPratheesh Gangadhar * events to AINTC of ARM host processor - which can be used for IPC b/w PRUSS
37f1a304e7SPratheesh Gangadhar * firmware and user space application, async notification from PRU firmware
38f1a304e7SPratheesh Gangadhar * to user space application
39f1a304e7SPratheesh Gangadhar * 3 PRU_EVTOUT0
40f1a304e7SPratheesh Gangadhar * 4 PRU_EVTOUT1
41f1a304e7SPratheesh Gangadhar * 5 PRU_EVTOUT2
42f1a304e7SPratheesh Gangadhar * 6 PRU_EVTOUT3
43f1a304e7SPratheesh Gangadhar * 7 PRU_EVTOUT4
44f1a304e7SPratheesh Gangadhar * 8 PRU_EVTOUT5
45f1a304e7SPratheesh Gangadhar * 9 PRU_EVTOUT6
46f1a304e7SPratheesh Gangadhar * 10 PRU_EVTOUT7
47f1a304e7SPratheesh Gangadhar */
48f1a304e7SPratheesh Gangadhar #define MAX_PRUSS_EVT 8
49f1a304e7SPratheesh Gangadhar
50f1a304e7SPratheesh Gangadhar #define PINTC_HIDISR 0x0038
51f1a304e7SPratheesh Gangadhar #define PINTC_HIPIR 0x0900
52f1a304e7SPratheesh Gangadhar #define HIPIR_NOPEND 0x80000000
53f1a304e7SPratheesh Gangadhar #define PINTC_HIER 0x1500
54f1a304e7SPratheesh Gangadhar
55f1a304e7SPratheesh Gangadhar struct uio_pruss_dev {
56f1a304e7SPratheesh Gangadhar struct uio_info *info;
57f1a304e7SPratheesh Gangadhar struct clk *pruss_clk;
58f1a304e7SPratheesh Gangadhar dma_addr_t sram_paddr;
59f1a304e7SPratheesh Gangadhar dma_addr_t ddr_paddr;
60f1a304e7SPratheesh Gangadhar void __iomem *prussio_vaddr;
612eb2478dSMatt Porter unsigned long sram_vaddr;
62f1a304e7SPratheesh Gangadhar void *ddr_vaddr;
63f1a304e7SPratheesh Gangadhar unsigned int hostirq_start;
64f1a304e7SPratheesh Gangadhar unsigned int pintc_base;
652eb2478dSMatt Porter struct gen_pool *sram_pool;
66f1a304e7SPratheesh Gangadhar };
67f1a304e7SPratheesh Gangadhar
pruss_handler(int irq,struct uio_info * info)68f1a304e7SPratheesh Gangadhar static irqreturn_t pruss_handler(int irq, struct uio_info *info)
69f1a304e7SPratheesh Gangadhar {
70f1a304e7SPratheesh Gangadhar struct uio_pruss_dev *gdev = info->priv;
71f1a304e7SPratheesh Gangadhar int intr_bit = (irq - gdev->hostirq_start + 2);
72f1a304e7SPratheesh Gangadhar int val, intr_mask = (1 << intr_bit);
73f1a304e7SPratheesh Gangadhar void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base;
74f1a304e7SPratheesh Gangadhar void __iomem *intren_reg = base + PINTC_HIER;
75f1a304e7SPratheesh Gangadhar void __iomem *intrdis_reg = base + PINTC_HIDISR;
76f1a304e7SPratheesh Gangadhar void __iomem *intrstat_reg = base + PINTC_HIPIR + (intr_bit << 2);
77f1a304e7SPratheesh Gangadhar
78f1a304e7SPratheesh Gangadhar val = ioread32(intren_reg);
79f1a304e7SPratheesh Gangadhar /* Is interrupt enabled and active ? */
80f1a304e7SPratheesh Gangadhar if (!(val & intr_mask) && (ioread32(intrstat_reg) & HIPIR_NOPEND))
81f1a304e7SPratheesh Gangadhar return IRQ_NONE;
82f1a304e7SPratheesh Gangadhar /* Disable interrupt */
83f1a304e7SPratheesh Gangadhar iowrite32(intr_bit, intrdis_reg);
84f1a304e7SPratheesh Gangadhar return IRQ_HANDLED;
85f1a304e7SPratheesh Gangadhar }
86f1a304e7SPratheesh Gangadhar
pruss_cleanup(struct device * dev,struct uio_pruss_dev * gdev)874719ebfdSAndre Heider static void pruss_cleanup(struct device *dev, struct uio_pruss_dev *gdev)
88f1a304e7SPratheesh Gangadhar {
89f1a304e7SPratheesh Gangadhar int cnt;
90f1a304e7SPratheesh Gangadhar struct uio_info *p = gdev->info;
91f1a304e7SPratheesh Gangadhar
92f1a304e7SPratheesh Gangadhar for (cnt = 0; cnt < MAX_PRUSS_EVT; cnt++, p++) {
93f1a304e7SPratheesh Gangadhar uio_unregister_device(p);
94f1a304e7SPratheesh Gangadhar }
95f1a304e7SPratheesh Gangadhar iounmap(gdev->prussio_vaddr);
96f1a304e7SPratheesh Gangadhar if (gdev->ddr_vaddr) {
974719ebfdSAndre Heider dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,
98f1a304e7SPratheesh Gangadhar gdev->ddr_paddr);
99f1a304e7SPratheesh Gangadhar }
100f1a304e7SPratheesh Gangadhar if (gdev->sram_vaddr)
1012eb2478dSMatt Porter gen_pool_free(gdev->sram_pool,
1022eb2478dSMatt Porter gdev->sram_vaddr,
1032eb2478dSMatt Porter sram_pool_sz);
104e663c5dbSAlexey Khoroshilov clk_disable(gdev->pruss_clk);
105f1a304e7SPratheesh Gangadhar }
106f1a304e7SPratheesh Gangadhar
pruss_probe(struct platform_device * pdev)1074719ebfdSAndre Heider static int pruss_probe(struct platform_device *pdev)
108f1a304e7SPratheesh Gangadhar {
109f1a304e7SPratheesh Gangadhar struct uio_info *p;
110f1a304e7SPratheesh Gangadhar struct uio_pruss_dev *gdev;
111f1a304e7SPratheesh Gangadhar struct resource *regs_prussio;
1124719ebfdSAndre Heider struct device *dev = &pdev->dev;
11395883676SDan Carpenter int ret, cnt, i, len;
1144719ebfdSAndre Heider struct uio_pruss_pdata *pdata = dev_get_platdata(dev);
115f1a304e7SPratheesh Gangadhar
116cfd3443eSAlexandru Ardelean gdev = devm_kzalloc(dev, sizeof(struct uio_pruss_dev), GFP_KERNEL);
117f1a304e7SPratheesh Gangadhar if (!gdev)
118f1a304e7SPratheesh Gangadhar return -ENOMEM;
119f1a304e7SPratheesh Gangadhar
120cfd3443eSAlexandru Ardelean gdev->info = devm_kcalloc(dev, MAX_PRUSS_EVT, sizeof(*p), GFP_KERNEL);
121cfd3443eSAlexandru Ardelean if (!gdev->info)
122cfd3443eSAlexandru Ardelean return -ENOMEM;
1234719ebfdSAndre Heider
124f1a304e7SPratheesh Gangadhar /* Power on PRU in case its not done as part of boot-loader */
12568d62119SAlexandru Ardelean gdev->pruss_clk = devm_clk_get(dev, "pruss");
126f1a304e7SPratheesh Gangadhar if (IS_ERR(gdev->pruss_clk)) {
1274719ebfdSAndre Heider dev_err(dev, "Failed to get clock\n");
128cfd3443eSAlexandru Ardelean return PTR_ERR(gdev->pruss_clk);
12995883676SDan Carpenter }
13095883676SDan Carpenter
131e663c5dbSAlexey Khoroshilov ret = clk_enable(gdev->pruss_clk);
132e663c5dbSAlexey Khoroshilov if (ret) {
133e663c5dbSAlexey Khoroshilov dev_err(dev, "Failed to enable clock\n");
13468d62119SAlexandru Ardelean return ret;
135f1a304e7SPratheesh Gangadhar }
136f1a304e7SPratheesh Gangadhar
1374719ebfdSAndre Heider regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0);
138f1a304e7SPratheesh Gangadhar if (!regs_prussio) {
1394719ebfdSAndre Heider dev_err(dev, "No PRUSS I/O resource specified\n");
14095883676SDan Carpenter ret = -EIO;
14195883676SDan Carpenter goto err_clk_disable;
142f1a304e7SPratheesh Gangadhar }
143f1a304e7SPratheesh Gangadhar
144f1a304e7SPratheesh Gangadhar if (!regs_prussio->start) {
1454719ebfdSAndre Heider dev_err(dev, "Invalid memory resource\n");
14695883676SDan Carpenter ret = -EIO;
14795883676SDan Carpenter goto err_clk_disable;
148f1a304e7SPratheesh Gangadhar }
149f1a304e7SPratheesh Gangadhar
1502eb2478dSMatt Porter if (pdata->sram_pool) {
1512eb2478dSMatt Porter gdev->sram_pool = pdata->sram_pool;
1522eb2478dSMatt Porter gdev->sram_vaddr =
153288342e9SNicolin Chen (unsigned long)gen_pool_dma_alloc(gdev->sram_pool,
154288342e9SNicolin Chen sram_pool_sz, &gdev->sram_paddr);
155f1a304e7SPratheesh Gangadhar if (!gdev->sram_vaddr) {
1564719ebfdSAndre Heider dev_err(dev, "Could not allocate SRAM pool\n");
15795883676SDan Carpenter ret = -ENOMEM;
15895883676SDan Carpenter goto err_clk_disable;
159f1a304e7SPratheesh Gangadhar }
1602eb2478dSMatt Porter }
161f1a304e7SPratheesh Gangadhar
1624719ebfdSAndre Heider gdev->ddr_vaddr = dma_alloc_coherent(dev, extram_pool_sz,
163f1a304e7SPratheesh Gangadhar &(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA);
164f1a304e7SPratheesh Gangadhar if (!gdev->ddr_vaddr) {
1654719ebfdSAndre Heider dev_err(dev, "Could not allocate external memory\n");
16695883676SDan Carpenter ret = -ENOMEM;
16795883676SDan Carpenter goto err_free_sram;
168f1a304e7SPratheesh Gangadhar }
169f1a304e7SPratheesh Gangadhar
170f1a304e7SPratheesh Gangadhar len = resource_size(regs_prussio);
171f1a304e7SPratheesh Gangadhar gdev->prussio_vaddr = ioremap(regs_prussio->start, len);
172f1a304e7SPratheesh Gangadhar if (!gdev->prussio_vaddr) {
1734719ebfdSAndre Heider dev_err(dev, "Can't remap PRUSS I/O address range\n");
17495883676SDan Carpenter ret = -ENOMEM;
17595883676SDan Carpenter goto err_free_ddr_vaddr;
176f1a304e7SPratheesh Gangadhar }
177f1a304e7SPratheesh Gangadhar
1782fd84b9bSZhang Shurong ret = platform_get_irq(pdev, 0);
1792fd84b9bSZhang Shurong if (ret < 0)
180*979ca1caSYang Yingliang goto err_unmap;
1812fd84b9bSZhang Shurong
1822fd84b9bSZhang Shurong gdev->hostirq_start = ret;
183f1a304e7SPratheesh Gangadhar gdev->pintc_base = pdata->pintc_base;
184f1a304e7SPratheesh Gangadhar
185f1a304e7SPratheesh Gangadhar for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) {
186f1a304e7SPratheesh Gangadhar p->mem[0].addr = regs_prussio->start;
187f1a304e7SPratheesh Gangadhar p->mem[0].size = resource_size(regs_prussio);
188f1a304e7SPratheesh Gangadhar p->mem[0].memtype = UIO_MEM_PHYS;
189f1a304e7SPratheesh Gangadhar
190f1a304e7SPratheesh Gangadhar p->mem[1].addr = gdev->sram_paddr;
191f1a304e7SPratheesh Gangadhar p->mem[1].size = sram_pool_sz;
192f1a304e7SPratheesh Gangadhar p->mem[1].memtype = UIO_MEM_PHYS;
193f1a304e7SPratheesh Gangadhar
194f1a304e7SPratheesh Gangadhar p->mem[2].addr = gdev->ddr_paddr;
195f1a304e7SPratheesh Gangadhar p->mem[2].size = extram_pool_sz;
196f1a304e7SPratheesh Gangadhar p->mem[2].memtype = UIO_MEM_PHYS;
197f1a304e7SPratheesh Gangadhar
198cfd3443eSAlexandru Ardelean p->name = devm_kasprintf(dev, GFP_KERNEL, "pruss_evt%d", cnt);
199f1a304e7SPratheesh Gangadhar p->version = DRV_VERSION;
200f1a304e7SPratheesh Gangadhar
201f1a304e7SPratheesh Gangadhar /* Register PRUSS IRQ lines */
202f1a304e7SPratheesh Gangadhar p->irq = gdev->hostirq_start + cnt;
203f1a304e7SPratheesh Gangadhar p->handler = pruss_handler;
204f1a304e7SPratheesh Gangadhar p->priv = gdev;
205f1a304e7SPratheesh Gangadhar
2064719ebfdSAndre Heider ret = uio_register_device(dev, p);
207cfd3443eSAlexandru Ardelean if (ret < 0)
20895883676SDan Carpenter goto err_unloop;
20995883676SDan Carpenter }
210f1a304e7SPratheesh Gangadhar
2114719ebfdSAndre Heider platform_set_drvdata(pdev, gdev);
212f1a304e7SPratheesh Gangadhar return 0;
213f1a304e7SPratheesh Gangadhar
21495883676SDan Carpenter err_unloop:
21595883676SDan Carpenter for (i = 0, p = gdev->info; i < cnt; i++, p++) {
21695883676SDan Carpenter uio_unregister_device(p);
21795883676SDan Carpenter }
218*979ca1caSYang Yingliang err_unmap:
21995883676SDan Carpenter iounmap(gdev->prussio_vaddr);
22095883676SDan Carpenter err_free_ddr_vaddr:
22195883676SDan Carpenter dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,
22295883676SDan Carpenter gdev->ddr_paddr);
22395883676SDan Carpenter err_free_sram:
22495883676SDan Carpenter if (pdata->sram_pool)
22595883676SDan Carpenter gen_pool_free(gdev->sram_pool, gdev->sram_vaddr, sram_pool_sz);
22695883676SDan Carpenter err_clk_disable:
22795883676SDan Carpenter clk_disable(gdev->pruss_clk);
22895883676SDan Carpenter
229f1a304e7SPratheesh Gangadhar return ret;
230f1a304e7SPratheesh Gangadhar }
231f1a304e7SPratheesh Gangadhar
pruss_remove(struct platform_device * dev)2329b96c312SBill Pemberton static int pruss_remove(struct platform_device *dev)
233f1a304e7SPratheesh Gangadhar {
234f1a304e7SPratheesh Gangadhar struct uio_pruss_dev *gdev = platform_get_drvdata(dev);
235f1a304e7SPratheesh Gangadhar
2364719ebfdSAndre Heider pruss_cleanup(&dev->dev, gdev);
237f1a304e7SPratheesh Gangadhar return 0;
238f1a304e7SPratheesh Gangadhar }
239f1a304e7SPratheesh Gangadhar
240f1a304e7SPratheesh Gangadhar static struct platform_driver pruss_driver = {
241f1a304e7SPratheesh Gangadhar .probe = pruss_probe,
2425a59509bSBill Pemberton .remove = pruss_remove,
243f1a304e7SPratheesh Gangadhar .driver = {
244f1a304e7SPratheesh Gangadhar .name = DRV_NAME,
245f1a304e7SPratheesh Gangadhar },
246f1a304e7SPratheesh Gangadhar };
247f1a304e7SPratheesh Gangadhar
24811e3123dSAxel Lin module_platform_driver(pruss_driver);
249f1a304e7SPratheesh Gangadhar
250f1a304e7SPratheesh Gangadhar MODULE_LICENSE("GPL v2");
251f1a304e7SPratheesh Gangadhar MODULE_VERSION(DRV_VERSION);
252f1a304e7SPratheesh Gangadhar MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>");
253f1a304e7SPratheesh Gangadhar MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>");
254