Loading...
1/*
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>
28#include <mach/sram.h>
29
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/*
42 * Host event IRQ numbers from PRUSS - PRUSS can generate up to 8 interrupt
43 * 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;
68 void *sram_vaddr;
69 void *ddr_vaddr;
70 unsigned int hostirq_start;
71 unsigned int pintc_base;
72};
73
74static irqreturn_t pruss_handler(int irq, struct uio_info *info)
75{
76 struct uio_pruss_dev *gdev = info->priv;
77 int intr_bit = (irq - gdev->hostirq_start + 2);
78 int val, intr_mask = (1 << intr_bit);
79 void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base;
80 void __iomem *intren_reg = base + PINTC_HIER;
81 void __iomem *intrdis_reg = base + PINTC_HIDISR;
82 void __iomem *intrstat_reg = base + PINTC_HIPIR + (intr_bit << 2);
83
84 val = ioread32(intren_reg);
85 /* Is interrupt enabled and active ? */
86 if (!(val & intr_mask) && (ioread32(intrstat_reg) & HIPIR_NOPEND))
87 return IRQ_NONE;
88 /* Disable interrupt */
89 iowrite32(intr_bit, intrdis_reg);
90 return IRQ_HANDLED;
91}
92
93static void pruss_cleanup(struct platform_device *dev,
94 struct uio_pruss_dev *gdev)
95{
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) {
105 dma_free_coherent(&dev->dev, extram_pool_sz, gdev->ddr_vaddr,
106 gdev->ddr_paddr);
107 }
108 if (gdev->sram_vaddr)
109 sram_free(gdev->sram_vaddr, sram_pool_sz);
110 kfree(gdev->info);
111 clk_put(gdev->pruss_clk);
112 kfree(gdev);
113}
114
115static int __devinit pruss_probe(struct platform_device *dev)
116{
117 struct uio_info *p;
118 struct uio_pruss_dev *gdev;
119 struct resource *regs_prussio;
120 int ret = -ENODEV, cnt = 0, len;
121 struct uio_pruss_pdata *pdata = dev->dev.platform_data;
122
123 gdev = kzalloc(sizeof(struct uio_pruss_dev), GFP_KERNEL);
124 if (!gdev)
125 return -ENOMEM;
126
127 gdev->info = kzalloc(sizeof(*p) * MAX_PRUSS_EVT, GFP_KERNEL);
128 if (!gdev->info) {
129 kfree(gdev);
130 return -ENOMEM;
131 }
132 /* Power on PRU in case its not done as part of boot-loader */
133 gdev->pruss_clk = clk_get(&dev->dev, "pruss");
134 if (IS_ERR(gdev->pruss_clk)) {
135 dev_err(&dev->dev, "Failed to get clock\n");
136 kfree(gdev->info);
137 kfree(gdev);
138 ret = PTR_ERR(gdev->pruss_clk);
139 return ret;
140 } else {
141 clk_enable(gdev->pruss_clk);
142 }
143
144 regs_prussio = platform_get_resource(dev, IORESOURCE_MEM, 0);
145 if (!regs_prussio) {
146 dev_err(&dev->dev, "No PRUSS I/O resource specified\n");
147 goto out_free;
148 }
149
150 if (!regs_prussio->start) {
151 dev_err(&dev->dev, "Invalid memory resource\n");
152 goto out_free;
153 }
154
155 gdev->sram_vaddr = sram_alloc(sram_pool_sz, &(gdev->sram_paddr));
156 if (!gdev->sram_vaddr) {
157 dev_err(&dev->dev, "Could not allocate SRAM pool\n");
158 goto out_free;
159 }
160
161 gdev->ddr_vaddr = dma_alloc_coherent(&dev->dev, extram_pool_sz,
162 &(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA);
163 if (!gdev->ddr_vaddr) {
164 dev_err(&dev->dev, "Could not allocate external memory\n");
165 goto out_free;
166 }
167
168 len = resource_size(regs_prussio);
169 gdev->prussio_vaddr = ioremap(regs_prussio->start, len);
170 if (!gdev->prussio_vaddr) {
171 dev_err(&dev->dev, "Can't remap PRUSS I/O address range\n");
172 goto out_free;
173 }
174
175 gdev->pintc_base = pdata->pintc_base;
176 gdev->hostirq_start = platform_get_irq(dev, 0);
177
178 for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) {
179 p->mem[0].addr = regs_prussio->start;
180 p->mem[0].size = resource_size(regs_prussio);
181 p->mem[0].memtype = UIO_MEM_PHYS;
182
183 p->mem[1].addr = gdev->sram_paddr;
184 p->mem[1].size = sram_pool_sz;
185 p->mem[1].memtype = UIO_MEM_PHYS;
186
187 p->mem[2].addr = gdev->ddr_paddr;
188 p->mem[2].size = extram_pool_sz;
189 p->mem[2].memtype = UIO_MEM_PHYS;
190
191 p->name = kasprintf(GFP_KERNEL, "pruss_evt%d", cnt);
192 p->version = DRV_VERSION;
193
194 /* Register PRUSS IRQ lines */
195 p->irq = gdev->hostirq_start + cnt;
196 p->handler = pruss_handler;
197 p->priv = gdev;
198
199 ret = uio_register_device(&dev->dev, p);
200 if (ret < 0)
201 goto out_free;
202 }
203
204 platform_set_drvdata(dev, gdev);
205 return 0;
206
207out_free:
208 pruss_cleanup(dev, gdev);
209 return ret;
210}
211
212static int __devexit pruss_remove(struct platform_device *dev)
213{
214 struct uio_pruss_dev *gdev = platform_get_drvdata(dev);
215
216 pruss_cleanup(dev, gdev);
217 platform_set_drvdata(dev, NULL);
218 return 0;
219}
220
221static struct platform_driver pruss_driver = {
222 .probe = pruss_probe,
223 .remove = __devexit_p(pruss_remove),
224 .driver = {
225 .name = DRV_NAME,
226 .owner = THIS_MODULE,
227 },
228};
229
230static int __init pruss_init_module(void)
231{
232 return platform_driver_register(&pruss_driver);
233}
234
235module_init(pruss_init_module);
236
237static void __exit pruss_exit_module(void)
238{
239 platform_driver_unregister(&pruss_driver);
240}
241
242module_exit(pruss_exit_module);
243
244MODULE_LICENSE("GPL v2");
245MODULE_VERSION(DRV_VERSION);
246MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>");
247MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Programmable Real-Time Unit Sub System (PRUSS) UIO driver (uio_pruss)
4 *
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
7 *
8 * Copyright (C) 2010-11 Texas Instruments Incorporated - http://www.ti.com/
9 */
10#include <linux/device.h>
11#include <linux/module.h>
12#include <linux/moduleparam.h>
13#include <linux/platform_device.h>
14#include <linux/uio_driver.h>
15#include <linux/platform_data/uio_pruss.h>
16#include <linux/io.h>
17#include <linux/clk.h>
18#include <linux/dma-mapping.h>
19#include <linux/sizes.h>
20#include <linux/slab.h>
21#include <linux/genalloc.h>
22
23#define DRV_NAME "pruss_uio"
24#define DRV_VERSION "1.0"
25
26static int sram_pool_sz = SZ_16K;
27module_param(sram_pool_sz, int, 0);
28MODULE_PARM_DESC(sram_pool_sz, "sram pool size to allocate ");
29
30static int extram_pool_sz = SZ_256K;
31module_param(extram_pool_sz, int, 0);
32MODULE_PARM_DESC(extram_pool_sz, "external ram pool size to allocate");
33
34/*
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
37 * firmware and user space application, async notification from PRU firmware
38 * to user space application
39 * 3 PRU_EVTOUT0
40 * 4 PRU_EVTOUT1
41 * 5 PRU_EVTOUT2
42 * 6 PRU_EVTOUT3
43 * 7 PRU_EVTOUT4
44 * 8 PRU_EVTOUT5
45 * 9 PRU_EVTOUT6
46 * 10 PRU_EVTOUT7
47*/
48#define MAX_PRUSS_EVT 8
49
50#define PINTC_HIDISR 0x0038
51#define PINTC_HIPIR 0x0900
52#define HIPIR_NOPEND 0x80000000
53#define PINTC_HIER 0x1500
54
55struct uio_pruss_dev {
56 struct uio_info *info;
57 struct clk *pruss_clk;
58 dma_addr_t sram_paddr;
59 dma_addr_t ddr_paddr;
60 void __iomem *prussio_vaddr;
61 unsigned long sram_vaddr;
62 void *ddr_vaddr;
63 unsigned int hostirq_start;
64 unsigned int pintc_base;
65 struct gen_pool *sram_pool;
66};
67
68static irqreturn_t pruss_handler(int irq, struct uio_info *info)
69{
70 struct uio_pruss_dev *gdev = info->priv;
71 int intr_bit = (irq - gdev->hostirq_start + 2);
72 int val, intr_mask = (1 << intr_bit);
73 void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base;
74 void __iomem *intren_reg = base + PINTC_HIER;
75 void __iomem *intrdis_reg = base + PINTC_HIDISR;
76 void __iomem *intrstat_reg = base + PINTC_HIPIR + (intr_bit << 2);
77
78 val = ioread32(intren_reg);
79 /* Is interrupt enabled and active ? */
80 if (!(val & intr_mask) && (ioread32(intrstat_reg) & HIPIR_NOPEND))
81 return IRQ_NONE;
82 /* Disable interrupt */
83 iowrite32(intr_bit, intrdis_reg);
84 return IRQ_HANDLED;
85}
86
87static void pruss_cleanup(struct device *dev, struct uio_pruss_dev *gdev)
88{
89 int cnt;
90 struct uio_info *p = gdev->info;
91
92 for (cnt = 0; cnt < MAX_PRUSS_EVT; cnt++, p++) {
93 uio_unregister_device(p);
94 }
95 iounmap(gdev->prussio_vaddr);
96 if (gdev->ddr_vaddr) {
97 dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,
98 gdev->ddr_paddr);
99 }
100 if (gdev->sram_vaddr)
101 gen_pool_free(gdev->sram_pool,
102 gdev->sram_vaddr,
103 sram_pool_sz);
104 clk_disable(gdev->pruss_clk);
105}
106
107static int pruss_probe(struct platform_device *pdev)
108{
109 struct uio_info *p;
110 struct uio_pruss_dev *gdev;
111 struct resource *regs_prussio;
112 struct device *dev = &pdev->dev;
113 int ret, cnt, i, len;
114 struct uio_pruss_pdata *pdata = dev_get_platdata(dev);
115
116 gdev = devm_kzalloc(dev, sizeof(struct uio_pruss_dev), GFP_KERNEL);
117 if (!gdev)
118 return -ENOMEM;
119
120 gdev->info = devm_kcalloc(dev, MAX_PRUSS_EVT, sizeof(*p), GFP_KERNEL);
121 if (!gdev->info)
122 return -ENOMEM;
123
124 /* Power on PRU in case its not done as part of boot-loader */
125 gdev->pruss_clk = devm_clk_get(dev, "pruss");
126 if (IS_ERR(gdev->pruss_clk)) {
127 dev_err(dev, "Failed to get clock\n");
128 return PTR_ERR(gdev->pruss_clk);
129 }
130
131 ret = clk_enable(gdev->pruss_clk);
132 if (ret) {
133 dev_err(dev, "Failed to enable clock\n");
134 return ret;
135 }
136
137 regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0);
138 if (!regs_prussio) {
139 dev_err(dev, "No PRUSS I/O resource specified\n");
140 ret = -EIO;
141 goto err_clk_disable;
142 }
143
144 if (!regs_prussio->start) {
145 dev_err(dev, "Invalid memory resource\n");
146 ret = -EIO;
147 goto err_clk_disable;
148 }
149
150 if (pdata->sram_pool) {
151 gdev->sram_pool = pdata->sram_pool;
152 gdev->sram_vaddr =
153 (unsigned long)gen_pool_dma_alloc(gdev->sram_pool,
154 sram_pool_sz, &gdev->sram_paddr);
155 if (!gdev->sram_vaddr) {
156 dev_err(dev, "Could not allocate SRAM pool\n");
157 ret = -ENOMEM;
158 goto err_clk_disable;
159 }
160 }
161
162 gdev->ddr_vaddr = dma_alloc_coherent(dev, extram_pool_sz,
163 &(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA);
164 if (!gdev->ddr_vaddr) {
165 dev_err(dev, "Could not allocate external memory\n");
166 ret = -ENOMEM;
167 goto err_free_sram;
168 }
169
170 len = resource_size(regs_prussio);
171 gdev->prussio_vaddr = ioremap(regs_prussio->start, len);
172 if (!gdev->prussio_vaddr) {
173 dev_err(dev, "Can't remap PRUSS I/O address range\n");
174 ret = -ENOMEM;
175 goto err_free_ddr_vaddr;
176 }
177
178 gdev->pintc_base = pdata->pintc_base;
179 gdev->hostirq_start = platform_get_irq(pdev, 0);
180
181 for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) {
182 p->mem[0].addr = regs_prussio->start;
183 p->mem[0].size = resource_size(regs_prussio);
184 p->mem[0].memtype = UIO_MEM_PHYS;
185
186 p->mem[1].addr = gdev->sram_paddr;
187 p->mem[1].size = sram_pool_sz;
188 p->mem[1].memtype = UIO_MEM_PHYS;
189
190 p->mem[2].addr = gdev->ddr_paddr;
191 p->mem[2].size = extram_pool_sz;
192 p->mem[2].memtype = UIO_MEM_PHYS;
193
194 p->name = devm_kasprintf(dev, GFP_KERNEL, "pruss_evt%d", cnt);
195 p->version = DRV_VERSION;
196
197 /* Register PRUSS IRQ lines */
198 p->irq = gdev->hostirq_start + cnt;
199 p->handler = pruss_handler;
200 p->priv = gdev;
201
202 ret = uio_register_device(dev, p);
203 if (ret < 0)
204 goto err_unloop;
205 }
206
207 platform_set_drvdata(pdev, gdev);
208 return 0;
209
210err_unloop:
211 for (i = 0, p = gdev->info; i < cnt; i++, p++) {
212 uio_unregister_device(p);
213 }
214 iounmap(gdev->prussio_vaddr);
215err_free_ddr_vaddr:
216 dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,
217 gdev->ddr_paddr);
218err_free_sram:
219 if (pdata->sram_pool)
220 gen_pool_free(gdev->sram_pool, gdev->sram_vaddr, sram_pool_sz);
221err_clk_disable:
222 clk_disable(gdev->pruss_clk);
223
224 return ret;
225}
226
227static int pruss_remove(struct platform_device *dev)
228{
229 struct uio_pruss_dev *gdev = platform_get_drvdata(dev);
230
231 pruss_cleanup(&dev->dev, gdev);
232 return 0;
233}
234
235static struct platform_driver pruss_driver = {
236 .probe = pruss_probe,
237 .remove = pruss_remove,
238 .driver = {
239 .name = DRV_NAME,
240 },
241};
242
243module_platform_driver(pruss_driver);
244
245MODULE_LICENSE("GPL v2");
246MODULE_VERSION(DRV_VERSION);
247MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>");
248MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>");