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Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +05301/*
2 * Programmable Real-Time Unit Sub System (PRUSS) UIO driver (uio_pruss)
3 *
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
6 *
7 * Copyright (C) 2010-11 Texas Instruments Incorporated - http://www.ti.com/
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation version 2.
12 *
13 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
14 * kind, whether express or implied; without even the implied warranty
15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18#include <linux/device.h>
19#include <linux/module.h>
20#include <linux/moduleparam.h>
21#include <linux/platform_device.h>
22#include <linux/uio_driver.h>
23#include <linux/platform_data/uio_pruss.h>
24#include <linux/io.h>
25#include <linux/clk.h>
26#include <linux/dma-mapping.h>
27#include <linux/slab.h>
Matt Porter2eb24782012-10-05 13:04:40 -040028#include <linux/genalloc.h>
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +053029
30#define DRV_NAME "pruss_uio"
31#define DRV_VERSION "1.0"
32
33static int sram_pool_sz = SZ_16K;
34module_param(sram_pool_sz, int, 0);
35MODULE_PARM_DESC(sram_pool_sz, "sram pool size to allocate ");
36
37static int extram_pool_sz = SZ_256K;
38module_param(extram_pool_sz, int, 0);
39MODULE_PARM_DESC(extram_pool_sz, "external ram pool size to allocate");
40
41/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -030042 * Host event IRQ numbers from PRUSS - PRUSS can generate up to 8 interrupt
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +053043 * events to AINTC of ARM host processor - which can be used for IPC b/w PRUSS
44 * firmware and user space application, async notification from PRU firmware
45 * to user space application
46 * 3 PRU_EVTOUT0
47 * 4 PRU_EVTOUT1
48 * 5 PRU_EVTOUT2
49 * 6 PRU_EVTOUT3
50 * 7 PRU_EVTOUT4
51 * 8 PRU_EVTOUT5
52 * 9 PRU_EVTOUT6
53 * 10 PRU_EVTOUT7
54*/
55#define MAX_PRUSS_EVT 8
56
57#define PINTC_HIDISR 0x0038
58#define PINTC_HIPIR 0x0900
59#define HIPIR_NOPEND 0x80000000
60#define PINTC_HIER 0x1500
61
62struct uio_pruss_dev {
63 struct uio_info *info;
64 struct clk *pruss_clk;
65 dma_addr_t sram_paddr;
66 dma_addr_t ddr_paddr;
67 void __iomem *prussio_vaddr;
Matt Porter2eb24782012-10-05 13:04:40 -040068 unsigned long sram_vaddr;
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +053069 void *ddr_vaddr;
70 unsigned int hostirq_start;
71 unsigned int pintc_base;
Matt Porter2eb24782012-10-05 13:04:40 -040072 struct gen_pool *sram_pool;
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +053073};
74
75static irqreturn_t pruss_handler(int irq, struct uio_info *info)
76{
77 struct uio_pruss_dev *gdev = info->priv;
78 int intr_bit = (irq - gdev->hostirq_start + 2);
79 int val, intr_mask = (1 << intr_bit);
80 void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base;
81 void __iomem *intren_reg = base + PINTC_HIER;
82 void __iomem *intrdis_reg = base + PINTC_HIDISR;
83 void __iomem *intrstat_reg = base + PINTC_HIPIR + (intr_bit << 2);
84
85 val = ioread32(intren_reg);
86 /* Is interrupt enabled and active ? */
87 if (!(val & intr_mask) && (ioread32(intrstat_reg) & HIPIR_NOPEND))
88 return IRQ_NONE;
89 /* Disable interrupt */
90 iowrite32(intr_bit, intrdis_reg);
91 return IRQ_HANDLED;
92}
93
Andre Heider4719ebf2014-06-29 18:21:35 +020094static void pruss_cleanup(struct device *dev, struct uio_pruss_dev *gdev)
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +053095{
96 int cnt;
97 struct uio_info *p = gdev->info;
98
99 for (cnt = 0; cnt < MAX_PRUSS_EVT; cnt++, p++) {
100 uio_unregister_device(p);
101 kfree(p->name);
102 }
103 iounmap(gdev->prussio_vaddr);
104 if (gdev->ddr_vaddr) {
Andre Heider4719ebf2014-06-29 18:21:35 +0200105 dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530106 gdev->ddr_paddr);
107 }
108 if (gdev->sram_vaddr)
Matt Porter2eb24782012-10-05 13:04:40 -0400109 gen_pool_free(gdev->sram_pool,
110 gdev->sram_vaddr,
111 sram_pool_sz);
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530112 kfree(gdev->info);
113 clk_put(gdev->pruss_clk);
114 kfree(gdev);
115}
116
Andre Heider4719ebf2014-06-29 18:21:35 +0200117static int pruss_probe(struct platform_device *pdev)
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530118{
119 struct uio_info *p;
120 struct uio_pruss_dev *gdev;
121 struct resource *regs_prussio;
Andre Heider4719ebf2014-06-29 18:21:35 +0200122 struct device *dev = &pdev->dev;
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530123 int ret = -ENODEV, cnt = 0, len;
Andre Heider4719ebf2014-06-29 18:21:35 +0200124 struct uio_pruss_pdata *pdata = dev_get_platdata(dev);
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530125
126 gdev = kzalloc(sizeof(struct uio_pruss_dev), GFP_KERNEL);
127 if (!gdev)
128 return -ENOMEM;
129
130 gdev->info = kzalloc(sizeof(*p) * MAX_PRUSS_EVT, GFP_KERNEL);
131 if (!gdev->info) {
132 kfree(gdev);
133 return -ENOMEM;
134 }
Andre Heider4719ebf2014-06-29 18:21:35 +0200135
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530136 /* Power on PRU in case its not done as part of boot-loader */
Andre Heider4719ebf2014-06-29 18:21:35 +0200137 gdev->pruss_clk = clk_get(dev, "pruss");
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530138 if (IS_ERR(gdev->pruss_clk)) {
Andre Heider4719ebf2014-06-29 18:21:35 +0200139 dev_err(dev, "Failed to get clock\n");
Emil Goodecb3771b2013-06-06 15:55:28 +0200140 ret = PTR_ERR(gdev->pruss_clk);
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530141 kfree(gdev->info);
142 kfree(gdev);
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530143 return ret;
144 } else {
145 clk_enable(gdev->pruss_clk);
146 }
147
Andre Heider4719ebf2014-06-29 18:21:35 +0200148 regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530149 if (!regs_prussio) {
Andre Heider4719ebf2014-06-29 18:21:35 +0200150 dev_err(dev, "No PRUSS I/O resource specified\n");
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530151 goto out_free;
152 }
153
154 if (!regs_prussio->start) {
Andre Heider4719ebf2014-06-29 18:21:35 +0200155 dev_err(dev, "Invalid memory resource\n");
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530156 goto out_free;
157 }
158
Matt Porter2eb24782012-10-05 13:04:40 -0400159 if (pdata->sram_pool) {
160 gdev->sram_pool = pdata->sram_pool;
161 gdev->sram_vaddr =
Nicolin Chen288342e2013-11-12 15:09:57 -0800162 (unsigned long)gen_pool_dma_alloc(gdev->sram_pool,
163 sram_pool_sz, &gdev->sram_paddr);
Matt Porter2eb24782012-10-05 13:04:40 -0400164 if (!gdev->sram_vaddr) {
Andre Heider4719ebf2014-06-29 18:21:35 +0200165 dev_err(dev, "Could not allocate SRAM pool\n");
Matt Porter2eb24782012-10-05 13:04:40 -0400166 goto out_free;
167 }
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530168 }
169
Andre Heider4719ebf2014-06-29 18:21:35 +0200170 gdev->ddr_vaddr = dma_alloc_coherent(dev, extram_pool_sz,
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530171 &(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA);
172 if (!gdev->ddr_vaddr) {
Andre Heider4719ebf2014-06-29 18:21:35 +0200173 dev_err(dev, "Could not allocate external memory\n");
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530174 goto out_free;
175 }
176
177 len = resource_size(regs_prussio);
178 gdev->prussio_vaddr = ioremap(regs_prussio->start, len);
179 if (!gdev->prussio_vaddr) {
Andre Heider4719ebf2014-06-29 18:21:35 +0200180 dev_err(dev, "Can't remap PRUSS I/O address range\n");
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530181 goto out_free;
182 }
183
184 gdev->pintc_base = pdata->pintc_base;
Andre Heider4719ebf2014-06-29 18:21:35 +0200185 gdev->hostirq_start = platform_get_irq(pdev, 0);
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530186
187 for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) {
188 p->mem[0].addr = regs_prussio->start;
189 p->mem[0].size = resource_size(regs_prussio);
190 p->mem[0].memtype = UIO_MEM_PHYS;
191
192 p->mem[1].addr = gdev->sram_paddr;
193 p->mem[1].size = sram_pool_sz;
194 p->mem[1].memtype = UIO_MEM_PHYS;
195
196 p->mem[2].addr = gdev->ddr_paddr;
197 p->mem[2].size = extram_pool_sz;
198 p->mem[2].memtype = UIO_MEM_PHYS;
199
200 p->name = kasprintf(GFP_KERNEL, "pruss_evt%d", cnt);
201 p->version = DRV_VERSION;
202
203 /* Register PRUSS IRQ lines */
204 p->irq = gdev->hostirq_start + cnt;
205 p->handler = pruss_handler;
206 p->priv = gdev;
207
Andre Heider4719ebf2014-06-29 18:21:35 +0200208 ret = uio_register_device(dev, p);
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530209 if (ret < 0)
210 goto out_free;
211 }
212
Andre Heider4719ebf2014-06-29 18:21:35 +0200213 platform_set_drvdata(pdev, gdev);
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530214 return 0;
215
216out_free:
217 pruss_cleanup(dev, gdev);
218 return ret;
219}
220
Bill Pemberton9b96c312012-11-19 13:26:19 -0500221static int pruss_remove(struct platform_device *dev)
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530222{
223 struct uio_pruss_dev *gdev = platform_get_drvdata(dev);
224
Andre Heider4719ebf2014-06-29 18:21:35 +0200225 pruss_cleanup(&dev->dev, gdev);
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530226 return 0;
227}
228
229static struct platform_driver pruss_driver = {
230 .probe = pruss_probe,
Bill Pemberton5a595092012-11-19 13:21:07 -0500231 .remove = pruss_remove,
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530232 .driver = {
233 .name = DRV_NAME,
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530234 },
235};
236
Axel Lin11e31232011-11-26 15:18:55 +0800237module_platform_driver(pruss_driver);
Pratheesh Gangadharf1a304e2011-03-05 04:30:17 +0530238
239MODULE_LICENSE("GPL v2");
240MODULE_VERSION(DRV_VERSION);
241MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>");
242MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>");