1
2
3
4
5
6
7
8
9#include <linux/bitops.h>
10#include <linux/module.h>
11#include <linux/pci.h>
12#include <linux/rational.h>
13
14#include <linux/dmaengine.h>
15#include <linux/dma/dw.h>
16
17#include "8250_dwlib.h"
18
19#define PCI_DEVICE_ID_INTEL_QRK_UARTx 0x0936
20
21#define PCI_DEVICE_ID_INTEL_BYT_UART1 0x0f0a
22#define PCI_DEVICE_ID_INTEL_BYT_UART2 0x0f0c
23
24#define PCI_DEVICE_ID_INTEL_BSW_UART1 0x228a
25#define PCI_DEVICE_ID_INTEL_BSW_UART2 0x228c
26
27#define PCI_DEVICE_ID_INTEL_EHL_UART0 0x4b96
28#define PCI_DEVICE_ID_INTEL_EHL_UART1 0x4b97
29#define PCI_DEVICE_ID_INTEL_EHL_UART2 0x4b98
30#define PCI_DEVICE_ID_INTEL_EHL_UART3 0x4b99
31#define PCI_DEVICE_ID_INTEL_EHL_UART4 0x4b9a
32#define PCI_DEVICE_ID_INTEL_EHL_UART5 0x4b9b
33
34#define PCI_DEVICE_ID_INTEL_BDW_UART1 0x9ce3
35#define PCI_DEVICE_ID_INTEL_BDW_UART2 0x9ce4
36
37
38
39#define BYT_PRV_CLK 0x800
40#define BYT_PRV_CLK_EN BIT(0)
41#define BYT_PRV_CLK_M_VAL_SHIFT 1
42#define BYT_PRV_CLK_N_VAL_SHIFT 16
43#define BYT_PRV_CLK_UPDATE BIT(31)
44
45#define BYT_TX_OVF_INT 0x820
46#define BYT_TX_OVF_INT_MASK BIT(1)
47
48struct lpss8250;
49
50struct lpss8250_board {
51 unsigned long freq;
52 unsigned int base_baud;
53 int (*setup)(struct lpss8250 *, struct uart_port *p);
54 void (*exit)(struct lpss8250 *);
55};
56
57struct lpss8250 {
58 struct dw8250_port_data data;
59 struct lpss8250_board *board;
60
61
62 struct dw_dma_chip dma_chip;
63 struct dw_dma_slave dma_param;
64 u8 dma_maxburst;
65};
66
67static inline struct lpss8250 *to_lpss8250(struct dw8250_port_data *data)
68{
69 return container_of(data, struct lpss8250, data);
70}
71
72static void byt_set_termios(struct uart_port *p, struct ktermios *termios,
73 struct ktermios *old)
74{
75 unsigned int baud = tty_termios_baud_rate(termios);
76 struct lpss8250 *lpss = to_lpss8250(p->private_data);
77 unsigned long fref = lpss->board->freq, fuart = baud * 16;
78 unsigned long w = BIT(15) - 1;
79 unsigned long m, n;
80 u32 reg;
81
82
83 fuart = fuart ? fuart : 9600 * 16;
84
85
86 fuart *= rounddown_pow_of_two(fref / fuart);
87
88
89
90
91
92
93
94 rational_best_approximation(fuart, fref, w, w, &m, &n);
95 p->uartclk = fuart;
96
97
98 reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT);
99 writel(reg, p->membase + BYT_PRV_CLK);
100 reg |= BYT_PRV_CLK_EN | BYT_PRV_CLK_UPDATE;
101 writel(reg, p->membase + BYT_PRV_CLK);
102
103 dw8250_do_set_termios(p, termios, old);
104}
105
106static unsigned int byt_get_mctrl(struct uart_port *port)
107{
108 unsigned int ret = serial8250_do_get_mctrl(port);
109
110
111 ret |= TIOCM_CAR | TIOCM_DSR;
112
113 return ret;
114}
115
116static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
117{
118 struct dw_dma_slave *param = &lpss->dma_param;
119 struct pci_dev *pdev = to_pci_dev(port->dev);
120 struct pci_dev *dma_dev;
121
122 switch (pdev->device) {
123 case PCI_DEVICE_ID_INTEL_BYT_UART1:
124 case PCI_DEVICE_ID_INTEL_BSW_UART1:
125 case PCI_DEVICE_ID_INTEL_BDW_UART1:
126 param->src_id = 3;
127 param->dst_id = 2;
128 break;
129 case PCI_DEVICE_ID_INTEL_BYT_UART2:
130 case PCI_DEVICE_ID_INTEL_BSW_UART2:
131 case PCI_DEVICE_ID_INTEL_BDW_UART2:
132 param->src_id = 5;
133 param->dst_id = 4;
134 break;
135 default:
136 return -EINVAL;
137 }
138
139 dma_dev = pci_get_slot(pdev->bus, PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
140
141 param->dma_dev = &dma_dev->dev;
142 param->m_master = 0;
143 param->p_master = 1;
144
145 lpss->dma_maxburst = 16;
146
147 port->set_termios = byt_set_termios;
148 port->get_mctrl = byt_get_mctrl;
149
150
151 writel(BYT_TX_OVF_INT_MASK, port->membase + BYT_TX_OVF_INT);
152
153 return 0;
154}
155
156static void byt_serial_exit(struct lpss8250 *lpss)
157{
158 struct dw_dma_slave *param = &lpss->dma_param;
159
160
161 put_device(param->dma_dev);
162}
163
164static int ehl_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
165{
166 struct uart_8250_dma *dma = &lpss->data.dma;
167 struct uart_8250_port *up = up_to_u8250p(port);
168
169
170
171
172
173
174
175 up->dma = dma;
176
177 port->set_termios = dw8250_do_set_termios;
178
179 return 0;
180}
181
182static void ehl_serial_exit(struct lpss8250 *lpss)
183{
184 struct uart_8250_port *up = serial8250_get_port(lpss->data.line);
185
186 up->dma = NULL;
187}
188
189#ifdef CONFIG_SERIAL_8250_DMA
190static const struct dw_dma_platform_data qrk_serial_dma_pdata = {
191 .nr_channels = 2,
192 .chan_allocation_order = CHAN_ALLOCATION_ASCENDING,
193 .chan_priority = CHAN_PRIORITY_ASCENDING,
194 .block_size = 4095,
195 .nr_masters = 1,
196 .data_width = {4},
197 .multi_block = {0},
198};
199
200static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
201{
202 struct uart_8250_dma *dma = &lpss->data.dma;
203 struct dw_dma_chip *chip = &lpss->dma_chip;
204 struct dw_dma_slave *param = &lpss->dma_param;
205 struct pci_dev *pdev = to_pci_dev(port->dev);
206 int ret;
207
208 chip->pdata = &qrk_serial_dma_pdata;
209 chip->dev = &pdev->dev;
210 chip->id = pdev->devfn;
211 chip->irq = pci_irq_vector(pdev, 0);
212 chip->regs = pci_ioremap_bar(pdev, 1);
213 if (!chip->regs)
214 return;
215
216
217 ret = dw_dma_probe(chip);
218 if (ret)
219 return;
220
221 pci_try_set_mwi(pdev);
222
223
224 dma->rx_dma_addr = 0xfffff000;
225 dma->tx_dma_addr = 0xfffff000;
226
227 param->dma_dev = &pdev->dev;
228 param->src_id = 0;
229 param->dst_id = 1;
230 param->hs_polarity = true;
231
232 lpss->dma_maxburst = 8;
233}
234
235static void qrk_serial_exit_dma(struct lpss8250 *lpss)
236{
237 struct dw_dma_chip *chip = &lpss->dma_chip;
238 struct dw_dma_slave *param = &lpss->dma_param;
239
240 if (!param->dma_dev)
241 return;
242
243 dw_dma_remove(chip);
244
245 pci_iounmap(to_pci_dev(chip->dev), chip->regs);
246}
247#else
248static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port) {}
249static void qrk_serial_exit_dma(struct lpss8250 *lpss) {}
250#endif
251
252static int qrk_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
253{
254 qrk_serial_setup_dma(lpss, port);
255 return 0;
256}
257
258static void qrk_serial_exit(struct lpss8250 *lpss)
259{
260 qrk_serial_exit_dma(lpss);
261}
262
263static bool lpss8250_dma_filter(struct dma_chan *chan, void *param)
264{
265 struct dw_dma_slave *dws = param;
266
267 if (dws->dma_dev != chan->device->dev)
268 return false;
269
270 chan->private = dws;
271 return true;
272}
273
274static int lpss8250_dma_setup(struct lpss8250 *lpss, struct uart_8250_port *port)
275{
276 struct uart_8250_dma *dma = &lpss->data.dma;
277 struct dw_dma_slave *rx_param, *tx_param;
278 struct device *dev = port->port.dev;
279
280 if (!lpss->dma_param.dma_dev)
281 return 0;
282
283 rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL);
284 if (!rx_param)
285 return -ENOMEM;
286
287 tx_param = devm_kzalloc(dev, sizeof(*tx_param), GFP_KERNEL);
288 if (!tx_param)
289 return -ENOMEM;
290
291 *rx_param = lpss->dma_param;
292 dma->rxconf.src_maxburst = lpss->dma_maxburst;
293
294 *tx_param = lpss->dma_param;
295 dma->txconf.dst_maxburst = lpss->dma_maxburst;
296
297 dma->fn = lpss8250_dma_filter;
298 dma->rx_param = rx_param;
299 dma->tx_param = tx_param;
300
301 port->dma = dma;
302 return 0;
303}
304
305static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
306{
307 struct uart_8250_port uart;
308 struct lpss8250 *lpss;
309 int ret;
310
311 ret = pcim_enable_device(pdev);
312 if (ret)
313 return ret;
314
315 pci_set_master(pdev);
316
317 lpss = devm_kzalloc(&pdev->dev, sizeof(*lpss), GFP_KERNEL);
318 if (!lpss)
319 return -ENOMEM;
320
321 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
322 if (ret < 0)
323 return ret;
324
325 lpss->board = (struct lpss8250_board *)id->driver_data;
326
327 memset(&uart, 0, sizeof(struct uart_8250_port));
328
329 uart.port.dev = &pdev->dev;
330 uart.port.irq = pci_irq_vector(pdev, 0);
331 uart.port.private_data = &lpss->data;
332 uart.port.type = PORT_16550A;
333 uart.port.iotype = UPIO_MEM;
334 uart.port.regshift = 2;
335 uart.port.uartclk = lpss->board->base_baud * 16;
336 uart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE;
337 uart.capabilities = UART_CAP_FIFO | UART_CAP_AFE;
338 uart.port.mapbase = pci_resource_start(pdev, 0);
339 uart.port.membase = pcim_iomap(pdev, 0, 0);
340 if (!uart.port.membase)
341 return -ENOMEM;
342
343 ret = lpss->board->setup(lpss, &uart.port);
344 if (ret)
345 return ret;
346
347 dw8250_setup_port(&uart.port);
348
349 ret = lpss8250_dma_setup(lpss, &uart);
350 if (ret)
351 goto err_exit;
352
353 ret = serial8250_register_8250_port(&uart);
354 if (ret < 0)
355 goto err_exit;
356
357 lpss->data.line = ret;
358
359 pci_set_drvdata(pdev, lpss);
360 return 0;
361
362err_exit:
363 lpss->board->exit(lpss);
364 pci_free_irq_vectors(pdev);
365 return ret;
366}
367
368static void lpss8250_remove(struct pci_dev *pdev)
369{
370 struct lpss8250 *lpss = pci_get_drvdata(pdev);
371
372 serial8250_unregister_port(lpss->data.line);
373
374 lpss->board->exit(lpss);
375 pci_free_irq_vectors(pdev);
376}
377
378static const struct lpss8250_board byt_board = {
379 .freq = 100000000,
380 .base_baud = 2764800,
381 .setup = byt_serial_setup,
382 .exit = byt_serial_exit,
383};
384
385static const struct lpss8250_board ehl_board = {
386 .freq = 200000000,
387 .base_baud = 12500000,
388 .setup = ehl_serial_setup,
389 .exit = ehl_serial_exit,
390};
391
392static const struct lpss8250_board qrk_board = {
393 .freq = 44236800,
394 .base_baud = 2764800,
395 .setup = qrk_serial_setup,
396 .exit = qrk_serial_exit,
397};
398
399static const struct pci_device_id pci_ids[] = {
400 { PCI_DEVICE_DATA(INTEL, QRK_UARTx, &qrk_board) },
401 { PCI_DEVICE_DATA(INTEL, EHL_UART0, &ehl_board) },
402 { PCI_DEVICE_DATA(INTEL, EHL_UART1, &ehl_board) },
403 { PCI_DEVICE_DATA(INTEL, EHL_UART2, &ehl_board) },
404 { PCI_DEVICE_DATA(INTEL, EHL_UART3, &ehl_board) },
405 { PCI_DEVICE_DATA(INTEL, EHL_UART4, &ehl_board) },
406 { PCI_DEVICE_DATA(INTEL, EHL_UART5, &ehl_board) },
407 { PCI_DEVICE_DATA(INTEL, BYT_UART1, &byt_board) },
408 { PCI_DEVICE_DATA(INTEL, BYT_UART2, &byt_board) },
409 { PCI_DEVICE_DATA(INTEL, BSW_UART1, &byt_board) },
410 { PCI_DEVICE_DATA(INTEL, BSW_UART2, &byt_board) },
411 { PCI_DEVICE_DATA(INTEL, BDW_UART1, &byt_board) },
412 { PCI_DEVICE_DATA(INTEL, BDW_UART2, &byt_board) },
413 { }
414};
415MODULE_DEVICE_TABLE(pci, pci_ids);
416
417static struct pci_driver lpss8250_pci_driver = {
418 .name = "8250_lpss",
419 .id_table = pci_ids,
420 .probe = lpss8250_probe,
421 .remove = lpss8250_remove,
422};
423
424module_pci_driver(lpss8250_pci_driver);
425
426MODULE_AUTHOR("Intel Corporation");
427MODULE_LICENSE("GPL v2");
428MODULE_DESCRIPTION("Intel LPSS UART driver");
429
